Nanjing Pege’s “PEIKE” brand Gravimetric Loss-in-weight feeder

Introduction

Nanjing Pege Techno Machine Co., Ltd is specialized in designing and producing the low in weight feeders including single and twin screws loss in weight feeder, liquid gravimetric feeder, micro scale feeder, vibratory feeder, Paddle massaged flexible PUR hopper feeder and multi-ingredients compounding feeder.

Our products are successfully applied in various dosing and blending(mixing) field, like chemistry, engineering plastics, cable, food processing, pharmaceutical and building material industries.

Our head company is constantly dedicated to providing the solutions of weighing, feeding, transmission, packing and automatic stacking, to provide the professional products and service for the customer worldwide both in solid and liquid product manufacturing field. To strengthen our competence and leading position in the gravimetric weighing field, we integrated our profound technology and talents to better improve our design and manufacturing competence.

PRODUCTS

Twin screw loss-in-weight feeder 

Application material

Resin Granules, Resin Powder, Calcium carbonate, French Chalk, Tio2, Carbon Black

Features

1. Cantilever type weighing frame ensure lower gravity(barycenter) center, weaker vibration and anti-interference performance of the whole feeder.

2. Vertical U-shaped hopper with mirror-like inner wall and without corner enclosure can ensure no bridge of the materials

3. Stainless Steel bellow sensor has the feature of only slight deformation after long time use, and high precision with less signal drift, and is durable for bad environment use

4. 485 Digital transmission of weighing data has the feature of no attenuation and anti-interference during the period of data transmission.

5. Feeding and stirring is operated separately, using independent agitation motor and stirring speed can be adjusted according to the demand.

6. No agitation motor on the top of the hopper will surely reduce the vibration during the operation, then this design will achieve high stability and high accuracy.

Vibrating Tray Loss-in-weight Feeder

Application material

Flack, Glass Fiber, Cylindrical Material, Irregular Shape Material from Recovery

Features

1. Cantilever type weighing frame ensure lower gravity(barycenter) center, weaker vibration and anti-interference performance of the whole feeder.

2. Double weighing sensors weight platform ensure good balance degree and no unbalanced loading

3. 485 Digital transmission of weighing data has the feature of no attenuation and anti-interference during the period of data transmission

4. Vibration type feeding has no damage on the material itself.

5. Electrical magnetic vibration type feeding ensures tiny machine wear and tear and nearly none of maintenance parts are needed

Applications Material

Liquid Additive DCP Silane Maleic Anhydride

Features

1.       Cantilever type weighing frame ensure lower gravity(barycenter) center, weaker

vibration and anti-interference performance of the whole feeder.

2.       Stainless Steel bellow sensor has the feature of only slight deformation after long time use, and high precision with less signal drift, and is durable for bad environment use.

3.       485 Digital transmission of weighing data has the feature of no attenuation and anti- interference during the period of data transmission.

4.      Hydraulic Diaphragm Pump, Plunger Pump, Gear Pump are selectable.

5.       Equipped with complete isolated SUS304 bellow spring damping type spray gun, has the feature of keeping pressure stable within 48 hours.

6.      Explosion proof, heat preservation by water or electricity are selectable

Flexible Paddle-Massaged PUR Hopper Feeder

Application material

Resin Particles, Resin powder, Calcium Carbonate,

Talcum powder, Titanium White Powder

Carbon Black, Flame Retardant Antioxidant

Features

■Suitable for all-purpose bulk material, especially for the powder material with humidity and low flowability.

■The cantilever sling-type weighing scale supports the storage hopper, which has the characteristics of vibration reduction and anti-level interference. This design can effectively shield the non-weight value interference from the vibrator and measure the flow of the system more accurately.

■No bridging thanks to straight walled hopper.

■Gentle feed capability by paddling flexible hopper with external agitation.

■Easy to disassemble and to clean, convenient for maintenance.

■No direct touch between stirring unit and material ensures no damage on the materials.

■Improve material flowability, optimize dynamic loadings of the screws, to ensure stable and accurate flow rate.

■Arch breaker inside of the machine can ensure efficient weighing feeding even the humidity rate in the materials reaches to 20%

CONTROL SYSTEM FEATURES

1.  Self-learning: The equipment can automatically identify the bulk density and fluidity of the material during the pre-operation, self-tuning during operation and continuously optimizing the best P (proportion) and I (integral) values to ensure rapid response of the system operation

2. Anti-interference: Automatically identify the intensity and duration of the interference and adopt emergency backup procedures to deal with it urgently to ensure the stability and accuracy of the system.

3.       The software is independently developed. After the product leaves the factory, the original program will be burned on the Micro SD card and given to customers randomly. Hardware adjustment.

4.      The mainstream communication formats in the market can be customized according to customer needs, such as Modbus, PPI, MPI, Profibus, Ethernet and other communication formats, so that customers can access the factory's main control system.

5.       The weighing signal transmitter is a customized product with a resolution of one hundred thousandth. The transmitter is installed on the weighing frame and is about one meter away from the weighing sensor. The signal transmission uses RS485 twisted shielded wire and digital transmission. Eliminate signal attenuation and interference

6.      The controller uses Siemens SMART series PLC, each scale uses a CPU, and each scale (each CPU) is connected in parallel by Ethernet.

7.       The RS485 serial port of the Siemens controller communicates with the weighing transmitter, installs an RS485 serial port to communicate with the inverter or servo controller, and the built-in Ethernet port communicates with the touch screen or host computer through the switch. Digital communication throughout the network, high speed, efficiency and stability

8.      The system can display and record operating parameters and can be installed with industrial control computer systems such as domestic Kingview, Siemens Wincc. At the same time, a scanning gun can be installed for barcode parameter reading, process flow recording, and quality traceability.

FAQs on Peike loss-in-weight feeders

1.     What kinds of materials can be used for loss in weight feeding?

Resin granules, flack, flocculus, powder and pellets blendings

Resin Particles, Resin Powder, Calcium Carbonate, Glass fibers

Talcum Powder, Titanium White Powder Carbon Black, Flame Retardant Antioxidant

Flack, Glass Fiber, Cylindrical Material, Irregular Shape Material from Recovery

Liquid Additive, DCP Silane, Maleic Anhydride

2.    What kinds of feeders are included in the loss in weight feeder series?

Our feeding product range includes micro loss in weight feeder, single screw feeder, twin screw feeder, vibratory tray feeder, Paddle massaged Polyurethane Hoppe feeder and liquid loss in weight feeder.

PPS PET and PA parts nitrogen deburring machine

Cryogenic deflashing and deburring system is a process that employs cryogenic temperatures to remove flash on manufactured workpieces made of a wide range of plastics (and other materials) both thermoset and thermoplastic. Some examples of materials used include nylon, HD-PE, PPS, PET, polycarbonate, polypropylene, polyurethane, liquid crystal polymer, PA+GF, PC+GF, PEEK, and Acetal. Manufactured parts that have been successfully deburred include those made through injection molding, compression molding and extrusion molding.

 What is “Flash.”

“Flash” is a raised edge attached to the workpiece. It is an unwanted piece of material and requires removal. Many medical devices and other precision components are included in deflashing applications. Deburring accounts for a significant amount of the costs of manufacturing. The cryogenic deflashing process causes the flash or burr to become stiff or brittle and break away leaving a clean edge. There are three types of burrs that can be formed in manufacturing operations and can be classified by the physical manner of formation: Poisson burr, roll-over burr and Tear burr.

■Poisson Burr

A Poisson burr results from the tendency of a material to bulge at the side when compressed until permanent deformation of the plastic occurs.

■Roll-over Burr

A roll-over burr is a burr that is more of a chip that is bent rather that sheared. The resulting burr is usually comparatively larger. The process even removes recessed burrs in blind and through holes.

■Tear Burr

A Tear burr is the result of material tearing from a work piece rather than shearing from it.

In the cryogenic deflashing process, parts are loaded into a basket. A cryogem such as liquid nitrogen is used to cool the workpieces. After they are cooled they are tumbled with pellets- often a polycarbonate media ranging in size from 0.006 to 0.080 inches (0.15mm to 2.03 mm.) Sometimes cryogenic deflashing does not rely on a blasting action but rather on the tumbling of the parts to remove flash from the outer edges. The process can even remove recessed burrs in blind and through holes. The process does not affect the surface finish or the geometry of the part. Edges are maintained without rounding or removal of extra material and only the unwanted burrs are removed.

Cryogenic Deflashing Systems Advantages

Cryogenic deflashing equipements provides advantages over manual deflashing.

■The process maintains part integrity and critical tolerances. As it is a bath process the price per piece is far less as many more parts can be processed at the same time.

■Cryogenic deflashing is non-abrasive.

■As the process is computer controlled, the human operator variable is removed from the process.

■Mold life is extended by the cryogenic deflashing process. Instead of making a new mold a company may choose to deburr a manufactured part cryogenically and achieve the same product quality very much as they would with a new mold for a period of time until maintenance is performed.

Pege’s Automatic Nitrogen Trimming Machine’s Features

■Greater productivity

■Large output in short time

■Better and consistent Finish

■Low Labour dependence

■Space Saving

■Low Media Consumption

■Wide variety of rubber compounds - NR to Silicon Rubber

■Low Nitrogen Usage

■Simple Electrical Controls

■High Efficiency Blast Wheel

■Safety Interlocks

■Simple and Very Low maintenance

PU TPU TPE parts cryogenic deburring machine

Cryogenic Deflashing or cryogenic deburring is available for all molded parts, including those made of plastics, polymers, nylons, rubbers, silicone rubber, polyurethane, neoprene, liquid crystal polymer, urethane, viton, polycarbonate, PTFE, PPS, delrin, polypropylene, EPDM, nitrile, butyl, DAP, ABS, PEEK, Acetal and aluminum zinc die cast and precision elastomer parts.

Cryogenic Deflashing Works On Most Molded Parts

The computer-controlled process generates repeatable and reliable results. Many medical devices and other high value precision molded components are included in our vast array of successful deflashing applications. We have processed parts manufactured through injection molding, compression molding and extrusion molding.

Our cryogenic deflashing machine offers a fast and repeatable process to remove flash from plastic parts. Through freezing, tumbling and blasting polycarbonate media at your injection molded plastic parts, we are able to remove residual mold flash time and time again.

The Cryogenic Deflashing process was originally created to remove mold flash from rubber parts. We are able to deflash rubber parts that are injection molded, extrusion molded and compression molded. We have processed parts made of various durometers. We typically deflash rubber parts made of EPDM, neoprene, Viton, Buna-N, nitrile, natural gum, SBR, butyl, and other elastomers.

Our Cryogenic Deflashing machine is often used by molders who work with silicone rubber. Silicone rubber, by its nature, is very viscous causing it to flash during the molding process. The Pege’s Deflashing machine removes mold flash from silicone rubber parts. We deflash parts made of liquid silicone rubber and even special blends of silicone rubber that include conductive fillers such as silver, graphite, nickel.

Rather than invest in an expensive new or repaired mold tool, customers can elect to extend the functional life of their mold tool by adding the additional step of deflashing, to finish the part and remove any residual flash leftover after molding operations. It is economical to pay only a slight premium per part than to invest in a new molding tool that has a limited production life.

Cryogenic Deflashing is a fast and efficient process that provides complete removal of mold flash without affecting the surface finish. Therefore, it is a safe,clean and cost-effective alternative to traditional methods.

Parts are placed in a chamber, cooled, tumbled and impacted with plastic polycarbonate media. Mold flash is removed quickly and cleanly. No dust or residue remains after deflashing.

Cryogenic Deflashing is more cost-effective than labor-intensive hand deflashing by a significant margin. The cost to process parts can range from less than .01 cent to several dollars apiece. General rule of thumb: cost is between 10% and 20% of the value of the part, although each part must be considered on its individual

Nanjing Pegedeflashing’s Cryogenic Deburring Machine’s ADVANTAGES

Greater productivity

Large output in short time

Better and consistent Finish

Low Labour dependence

Space Saving

Low Media Consumption

Wide variety of rubber compounds - NR to Silicon Rubber

Low Nitrogen Usage

Simple Electrical Controls

High Efficiency Blast Wheel

Safety Interlocks

Simple and Very Low maintenance

Our factory and Workshop of cryogenic deflashing systems

Nanjing Pege Techno Machine Co.,Ltd production plant is located in the No.9 Ankang road, Guli Industrial Zone, Jiangning District, Nanjing.
We have professional production workers and process, are determine to produce best product for the customer all over the world

Packing and Transportation of cryogeic deflashing equipments

The machine produced by Nanjing Pege is well packed by plywood carton suitable for long distance sea transportation to ensure machine safety and performance.

We can help customer to arrange the transportation by the terms of FOB, CIF with land or sea transportation methods according to the request from the 

An aluminum foil container making machine is a specialized machine used for the production of aluminum foil food containers specifically designed for use in airlines and other similar food service industries. The aluminum foil plate/ tray making machine is capable of producing a high volume of uniform and standardized food containers in a fast and efficient manner.

The main components of an aluminum foil airline food container making machine typically include:

1. Feeding System: This system is responsible for feeding the aluminum foil material into the machine for further processing. It may consist of a roll of aluminum foil and a tension control system to ensure smooth and continuous feeding.

2. Material Cutting System: The machine is equipped with a cutting system to accurately cut the aluminum foil into the desired shape and size for the food containers. Various cutting mechanisms such as rotary cutting or stamping may be used depending on the specific design of the machine.

3. Molding System: This system shapes and molds the cut aluminum foil into the final form of the food container. It may utilize a combination of mechanical presses and molds to create the necessary folds and shapes required for the container.

4. Punching System: A punching system is employed to create perforations or ventilation holes in the formed aluminum foil containers, allowing steam and heat to circulate during the food heating process.

5. Stacking and Collection System: The machine typically includes a stacking and collection system to neatly stack and collect the finished aluminum foil containers, ready for packaging and transportation.

6. Control System: The aluminum foil plate/ tray making machine is controlled by an automated control system that enables operators to set parameters such as container size, cutting length, perforation patterns, and production speed. It ensures proper synchronization and coordination of the various machine components for efficient operation.

The main features of an aluminum foil airline food container making machine include high production efficiency, precise cutting and shaping capabilities, adjustable container sizes, automatic operation with minimal manual intervention, and reliable performance. These machines are designed to meet the specific requirements of the airline food service industry, producing containers that are lightweight, durable, and suitable for sealing and reheating food during flight operations.

The Main Compositions of A Cryogenic Deflashing System

A cryogenic deflashing machine, also known as a cryogenic deflashing system, is used for removing unwanted burrs, flash, or excess material from molded or machined components. The composition of a cryogenic deflashing system generally includes the following components:

1. Deflashing Chamber: This is the main working chamber where the components to be deflashed are placed. It is usually a sealed, insulated enclosure designed to withstand low temperatures.

2. Liquid Nitrogen (LN2) Supply（nitrogen deflashing machine）: Cryogenic deflashing relies on liquid nitrogen as the cryogenic medium. The LN2 supply provides the necessary cooling agent required for the process.

3. LN2 Delivery System: This system is responsible for delivering liquid nitrogen to the deflashing chamber. It typically consists of supply lines, valves, and control mechanisms to regulate the flow of LN2.

4. Control Panel: The control panel houses the electrical and electronic components that control and monitor the cryogenic deflashing process. It includes temperature controllers, timers, pressure gauges, and safety features.

5. Media Circulation Mechanism: Some cryogenic deflashing machines incorporate an auto media circulation system to realize the media blasting function and then enhance the deflashing process. This can be in the form of tumbling barrels, rotating baskets, or oscillating fixtures.

6. Exhaust System: As cryogenic  deflashing process generates gases and vapors, an exhaust system is employed to remove these by-products from the deflashing chamber. It helps maintain a safe working environment and prevents the accumulation of hazardous substances.

7. Filtration System: To remove any debris or particulate matter generated during the deflashing process, a filtration system may be included. It helps ensure the cleanliness of the liquid nitrogen and prolong the equipment's lifespan.

8. Safety Features: Cryogenic deburring machines often have safety features such as emergency stop buttons, alarms, and interlocks to ensure operator safety during operation.

It's important to note that specific configurations and features of cryogenic deflashing systems may vary depending on the manufacturer and the intended application. Get more details from www.pegedeflashing.com. 

Are you a steamed stuffed bun enthusiast? Do you dream of creating beautiful and delicious steamed buns with unique designs? Look no further than the SS304 Steamed Stuffed Bun Machine with different designs. This innovative machine takes your steamed bun-making to a whole new level, allowing you to impress your friends, family, and customers with professional-quality buns that look as good as they taste.

Unleash Your Creativity with Customizable Designs

Gone are the days of plain and ordinary steamed buns. The SS304 Steamed Stuffed Bun Machine lets you unleash your creativity by offering a wide range of customizable designs. Whether you want to make adorable animal shapes, intricate floral patterns, or even personalized logos, this machine has got you covered. Prepare to be amazed as your imagination runs wild and your steamed buns become miniature works of art.

Efficient and User-Friendly Operation

With the SS304 Steamed Stuffed Bun Machine, creating culinary masterpieces has never been easier. This machine is designed with the user in mind, featuring a simple and intuitive interface that allows you to effortlessly switch between different designs. Its precise and efficient steaming mechanism ensures that each bun is evenly cooked, guaranteeing a consistent and delectable texture every time.

Premium Quality Material for Durability and Food Safety

The SS304 Steamed Stuffed Bun Machine is crafted from high-grade stainless steel (SS304) to ensure durability and longevity. Not only does this material resist corrosion and withstand demanding use, but it also guarantees food safety. Stainless steel is known for its non-reactive properties, ensuring that your steamed buns remain pure and free from any potential contaminants. This machine is built to last, saving you money in the long run and giving you peace of mind in the kitchen.

Boost Your Production and Meet Demand

Whether you run a small bakery, catering business, or simply enjoy making steamed buns for your loved ones, the SS304 Steamed Stuffed Bun Machine is a game-changer. Its efficient design and versatile capabilities allow you to increase your production and meet the demands of even the busiest periods. Say goodbye to labor-intensive manual processes and hello to a streamlined operation that helps you efficiently satisfy cravings and put smiles on faces.

Elevate Your Steamed Stuffed Bun Game Today

If you’re serious about steamed buns and want to take your culinary creations to new heights, the SS304 Steamed Stuffed Bun Machine with different designs is your perfect companion. With its customizable designs, user-friendly operation, premium quality material, and increased production capabilities, this machine is a must-have for any steamed stuffed bun enthusiast. Embrace innovation, unleash your creativity, and elevate your steamed stuffed bun game today!

Invest in the SS304 Steamed Stuffed Bun Machine and prepare to dazzle both your taste buds and your guests with mouthwatering buns that are as visually stunning as they are delicious. It’s time to turn your steamed bun dreams into reality!

Are you a passionate Deep Processing Part enthusiast looking to enhance your skills? If so, you’ve come to the right place! In this article, we’ll be sharing some valuable tips and tricks specifically tailored for using the Pearl Cotton Foam Sheet Vertical Cutting Machine. Whether you’re a beginner or have some experience, these insights will surely help you achieve better results in your projects.

1. Familiarize Yourself with the Machine

Before diving into any project, it’s essential to understand the machine you’re working with. Take the time to read the user manual thoroughly, paying attention to safety precautions and operating instructions. This will help you avoid accidents and ensure a smooth cutting process.

2. Choose the Right Blade

Selecting the appropriate blade for your cutting machine is crucial. For Pearl Cotton Foam Sheet cutting, opt for blades that are specifically designed for this material. These blades have a fine-tooth configuration, enabling precise and clean cuts. Using the right blade will not only improve the quality of your work but also extend the life of your machine.

3. Maintain Blade Sharpness

Regular maintenance of your blade is essential to achieve optimal cutting results. Over time, the blade can dull due to continuous use. Make it a habit to check the sharpness regularly, and sharpen or replace the blade as needed. A sharp blade ensures clean, accurate cuts and reduces the chances of damaging the Pearl Cotton Foam Sheet.

4. Use Proper Cutting Techniques

When cutting Pearl Cotton Foam Sheets, it’s crucial to use the correct techniques to obtain the best results. Start by securing the material firmly in place, either by clamping or using adhesive tape. Take your time and cut slowly, allowing the blade to do its job without putting excessive pressure on it. Practice makes perfect, so don’t rush and be patient with your cuts.

5. Experiment with Different Settings and Techniques

The Pearl Cotton Foam Sheet Vertical Cutting Machine offers various cutting speeds and depth adjustments. Take advantage of these settings to explore different cutting techniques. Experiment with different speeds and depths to find the optimal settings for the specific project you’re working on. Don’t be afraid to try new approaches and find what works best for you.

6. Properly Store and Maintain the Machine

To maximize the lifespan of your Pearl Cotton Foam Sheet Vertical Cutting Machine, proper storage and maintenance are crucial. Make sure to clean the machine after each use, removing any debris or dust that may have accumulated. Store the machine in a clean and dry environment, away from excessive heat or moisture. Regularly check for any loose parts or signs of wear and tear.

With these valuable tips and tricks, you’re now equipped to make the most of your Pearl Cotton Foam Sheet Vertical Cutting Machine. Remember, practice and patience are key to improving your skills. So go ahead, unleash your creativity, and enjoy the rewarding experience of creating beautiful Deep Processing Part projects!

Application of Thermal Shock Test Chamber

Thermal shock test chamber is an indispensable test equipment for aviation, automotive, home appliances, scientific research and other fields, used to test and determine the parameters and performance of electrical, electronic and other products and materials after temperature environment changes in high temperature, low temperature, alternating humidity and heat degree or constant test; Or constant humid heat test after the temperature environment changes the parameters and performance. Applicable to schools, factories, research positions, etc.

1, the high and low temperature impact test chamber with automatic, high-precision system loop, any part action, fully PLC locking processing, all use PID automatic calculation control, high temperature control precision, advanced scientific air circulation cycle design, make the indoor temperature uniform, avoid any dead corners; The complete protection device avoids any possible hidden dangers and ensures the long-term reliability of the equipment.

2, high and low temperature impact test chamber adopts advanced measuring device, and the controller adopts a large color LCD man-machine touch dialogue LCD man-machine interface controller, which is simple to operate, easy to learn, stable and reliable, and displays the complete system operation status, execution and setting program curve in Chinese and English. With 96 test specifications independently set, impact time 999 hours 59 minutes, cycle cycle 1~999 times can be set, can realize the automatic operation of the refrigerator, to a large extent to achieve automation, reduce the workload of the operator, can automatically start and stop working at any time.

3, The left side of the chamber has a test hole with a diameter of 50mm, which can be used for wiring test parts with external power load. Can be independently set high temperature, low temperature and cold and thermal shock three different conditions of the function, and in the implementation of cold and thermal shock conditions, you can choose two or three trough and cold flushing, hot flushing impact function, with high and low temperature testing machine function.

Comparison of Climatic Test and Environmental Test

Climate environment test -- constant temperature and humidity test chamber, high and low temperature test chamber, cold and hot shock test chamber, wet and heat alternating test chamber, rapid temperature change test chamber, linear temperature change test chamber, walk-in constant temperature and humidity test chamber, etc. They all involve temperature control.

Because there are multiple temperature control points to choose from, the climate chamber temperature control method also has three solutions: inlet temperature control, product temperature control and "cascade" temperature control. The first two are single-point temperature control, and the third is two-parameter temperature control.

Single point temperature control method has been very mature and widely used.

Most of the early control methods were "ping-pong" switch control, commonly known as heating when it's cold and cooling when it's hot. This control mode is a feedback control mode. When the temperature of the circulating air flow is higher than the set temperature, the electromagnetic valve of refrigeration is opened to deliver cold volume to the circulating air flow and reduce the temperature of the air flow. Otherwise, the circuit switch of the heating device is switched on to directly heat the circulating air flow. Raise the temperature of the air stream. This control mode requires that the refrigeration device and heating components of the test chamber are always in a standby working state, which not only wastes a lot of energy, but also the controlled parameter (temperature) is always in an "oscillation" state, and the control accuracy is not high.

Now the single-point temperature control method is mostly changed to the universal proportional differential integral (PID) control method, which can give the controlled temperature correction according to the past change of the controlled parameter (integral control) and the change trend (differential control), which not only saves energy, but also the "oscillation" amplitude is small and the control accuracy is high.

Dual-parameter temperature control is to collect the temperature value of the air inlet of the test chamber and the temperature value near the product at the same time. The air inlet of the test chamber is very close to the installation position of the evaporator and heater in the air modulation room, and its magnitude directly reflects the air modulation result. Using this temperature value as the feedback control parameter has the advantage of quickly modulating the status parameters of the circulating air.

The temperature value near the product indicates the real temperature environmental conditions suffered by the product, which is the requirement of the environmental test specification. Using this temperature value as the parameter of feedback control can ensure the effectiveness and credibility of the temperature environmental test, so this approach takes into account the advantages of both and the requirements of the actual test. The dual-parameter temperature control strategy can be the independent "time-sharing control" of the two groups of temperature data, or the weighted two temperature values can be combined into one temperature value as a feedback control signal according to a certain weighting coefficient, and the value of the weighting coefficient is related to the size of the test chamber, the wind speed of the circulating air flow, the size of the temperature change rate, the heat output of the product work and other parameters.

Because heat transfer is a complex dynamic physical process, and is greatly affected by the atmospheric environment conditions around the test chamber, the working state of the tested sample itself, and the complexity of the structure, it is difficult to establish a perfect mathematical model for the temperature and humidity control of the test chamber. In order to improve the stability and accuracy of control, fuzzy logic control theory and method are introduced in the control of some temperature test chambers. In the control process, the thinking mode of human is simulated, and the predictive control is adopted to control the temperature and humidity space field more quickly.

Compared with the temperature, the selection of humidity measurement and control points is relatively simple. During the circulation flow of the well-regulated humid air into the high and low temperature cycle test chamber, the exchange of water molecules between the wet air and the test piece and the four walls of the test chamber is very small. As long as the temperature of the circulating air is stable, the circulating air flow from entering the test chamber to exiting the test chamber is in the process. The moisture content of wet air changes very little. Therefore, the relative humidity value of the detected air at any point of the circulating air flow field in the test box, such as the inlet, the middle stream of the flow field or the return air outlet, is basically the same. Because of this, in many test chambers that use the wet and dry bulb method to measure humidity, the wet and dry bulb sensor is installed at the return air outlet of the test chamber. Moreover, from the structural design of the test box and the convenience of maintenance in use, the wet and dry bulb sensor used for relative humidity measurement and control is placed at the return air inlet for easy installation, and also helps to regularly replace the wet bulb gauze and clean the temperature sensing head of the resistance PT100, and according to the requirements of the GJB150.9A wet heat test 6.1.3. The wind speed passing through the wet-bulb sensor should not be lower than 4.6m/s. The wet-bulb sensor with a small fan is installed at the return air outlet for easier maintenance and use.

Comparison of Natural Convection Test Chamber, Constant Temperature and Humidity Test Chamber and High Temperature Oven

Instructions:

Home entertainment audio-visual equipment and automotive electronics are one of the key products of many manufacturers, and the product in the development process must simulate the adaptability of the product to temperature and electronic characteristics at different temperatures. However, when using a general oven or thermohumidity machine to simulate the temperature environment, either the oven or thermohumidity machine has a test area equipped with a circulating fan, so there will be wind speed problems in the test area.

During the test, the temperature uniformity is balanced by rotating the circulating fan. Although the temperature uniformity of the test area can be achieved through the wind circulation, the heat of the product to be tested will also be taken away by the circulating air, which will be significantly inconsistent with the actual product in the wind-free use environment (such as the living room, indoor).

Because of the relationship of wind circulation, the temperature difference of the product to be tested will be nearly 10℃, in order to simulate the actual use of environmental conditions, many people will misunderstand that only the test machine can produce temperature (such as: oven, constant temperature wet machine) can carry out natural convection test, in fact, this is not the case. In the specification, there are special requirements for wind speed, and a test environment without wind speed is required. Through the natural convection test equipment and software, the temperature environment without passing through the fan (natural convection) is generated, and the test integration test is performed for the temperature detection of the product under test. This solution can be used for home related electronics or real-world ambient temperature testing in confined Spaces (e.g., large LCD TVS, car cockpits, automotive electronics, laptops, desktops, game consoles, stereos). Etc.).

Unforced air circulation test specification :IEC-68-2-2, GB2423.2, GB2423.2-89 3.31 The difference between the test environment with or without wind circulation and the test of products to be tested:

Instructions:

If the product to be tested is not energized, the product to be tested will not heat itself, its heat source only absorbs the air heat in the test furnace, and if the product to be tested is energized and heated, the wind circulation in the test furnace will take away the heat of the product to be tested. Every 1 meter increase in wind speed, its heat will be reduced by about 10%. Suppose to simulate the temperature characteristics of electronic products in an indoor environment without air conditioning, if an oven or a constant temperature humidifier is used to simulate 35 ° C, although the environment can be controlled within 35 ° C through electric heating and compressor, the wind circulation of the oven and the thermohumidifier will take away the heat of the product to be tested. So that the actual temperature of the product to be tested is lower than the temperature under the real windless state, it is necessary to use a natural convection testing machine without wind speed to effectively simulate the actual windless environment (indoor, no starting car cockpit, instrument chassis, outdoor waterproof box... Such environment).

Comparison table of wind speed and IC product to be tested:

Description: When the ambient wind speed is faster, the IC surface temperature will also take away the IC surface heat due to the wind cycle, resulting in the faster the wind speed and the lower the temperature.