Elephant Diesel Mud Pump is an efficient and reliable equipment widely used in oil drilling, mining, construction, tunnel engineering and other fields. Here is a complete overview of Elephant Diesel Mud Pump:

 

• Design Features:Mud Pumps With Diesel Engine adopts advanced design and manufacturing technology, and is efficient, energy-saving and durable. It is designed for handling mud and viscous liquids and can operate stably in harsh working environments.

 

• High-pressure output: Elephant Diesel Mud Pump is able to provide high-pressure output, making it suitable for handling high-density mud and liquid solids. High-pressure output helps to effectively carry and discharge mud to meet engineering needs.

 

• Durability and Reliability: Elephant Diesel Mud Pump adopts high-quality materials and components, which are precision-processed and strictly quality-controlled to ensure its durability and reliability. This enables the pump to maintain stable performance under long-term heavy-load operation.

 

• Easy Operation: Elephant Diesel Mud Pump adopts a user-friendly design and is easy to operate. It is equipped with advanced control systems and instruments, allowing operators to easily monitor and control the operating status of the pump.

 

• Customizability: Elephant Diesel Mud Pump is available in a variety of models and specifications to meet different engineering needs. According to the specific application scenario, it can be customized, including the pump displacement, pressure and outlet size.

 

• After-sales service: As an industry-leading manufacturer and supplier, Elephant Machinery is committed to providing customers with perfect after-sales service. We have a professional after-sales team that can provide timely technical support, maintenance and repair services to ensure that customers' equipment can continue to operate efficiently.

 

 

 

In short, Mud Diesel Engine Pump is an efficient and reliable equipment with advantages such as high-pressure output, durability, easy operation and customizability. It plays an important role in fields such as oil drilling, mining and construction, effectively handling mud and viscous liquids. By choosing the Elephant diesel mud pump, you can get high-quality equipment and excellent after-sales service to meet your engineering needs.

 

If you have further understanding of the Elephant diesel mud pump or other related products or need detailed consultation, please feel free to contact us. We are willing to provide you with support and help.

 

 

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. 

 

DHP Air Dry Machine designed and manufactured by Acore Filtration Co.,Ltd sales to Canada, which mainly supply dry air when installing and maintaining the transformers, reactors and other large-scale power equipment. The dew point of dry air can reach -70°C. The Dry Air Generator can replace the traditional hot oil circulation, nitrogen supplementation, vacuum and other drying methods, and is more efficient, economical, safe and environmentally friendly.

 

The dry air machine device is mainly composed of four parts: air compressor, freeze drying system, adsorption drying system and electrical control system. The air enters the air storage tank through the air compressor, and most of the water is compressed and liquefied and discharged through the drain valve, and the air is sub-dried; After entering the refrigeration dryer, the water vapor is condensed into water, and the air is dried for the second time; Then enter the adsorption dryer for the third drying, adsorb the remaining trace water, and transport it to the equipment that needs to dry the gas through a high-precision air filter.

 

The dry air generator has the advantages of stable output pressure, low noise and strong purification ability, and is an ideal air source to replace high-pressure air cylinders. The product can not only meet the use of various types of domestic and imported gas chromatographs and various analytical laboratories, but also can be used as an air source for high-purity nitrogen generators. The Air Dry Machine is powered by a fully enclosed compressor, which purifies the natural air through three stages to remove water, oil and impurities in the air, and outputs stable and clean air through the pressure stabilizing device.

 

 

Industrial touch screen monitors have become an essential tool in various industries, offering a user-friendly and intuitive interface to control and monitor industrial processes. One popular type of industrial touch screen monitor is the Frame LCD USB Open Frame Touch Monitor. In this step-by-step guide, we will walk you through the process of using this powerful device.

Step 1: Unpacking and Installation

When your industrial touch screen monitor arrives, carefully unpack it and ensure that all the components are included. You should find the monitor itself, a USB cable, a power adapter, and any mounting brackets if applicable.

Proceed to find a suitable location for the touch screen monitor. Make sure the area is free from dust, heat, and excessive moisture. Once you have selected the ideal spot, mount the monitor securely using the provided brackets or stand.

Step 2: Connecting the Monitor

Locate the USB port on your industrial touch screen monitor and connect one end of the USB cable to the port. The other end of the cable should be plugged into an available USB port on your computer or any device you wish to connect.

Step 3: Powering On the Monitor

Before you power on the monitor, ensure that the power adapter is securely connected to both the monitor and a power outlet. Once everything is properly connected, press the power button to turn on the monitor. You will see the screen light up, displaying the initial setup screen.

Step 4: Calibrating the Touch Screen

To ensure accurate touch responses, you will need to calibrate the touch screen. Follow the on-screen instructions to perform the calibration process. Usually, this involves touching specific points on the screen as directed. Once the calibration is complete, your touch screen monitor will be ready for use.

Step 5: Navigating the Interface

Depending on the specific model and software installed, you may have different options for navigating the touch screen monitor interface. It is essential to familiarize yourself with the interface elements, such as buttons, menus, and settings. Take some time to explore and get comfortable with the various features and functionalities offered.

Step 6: Customizing Settings

Industrial touch screen monitors often provide customization options to suit different user preferences. Navigate to the settings menu and explore the available options. You might be able to adjust screen brightness, touch sensitivity, screen orientation, and other display settings. Experiment with these settings to optimize your experience.

Step 7: Using Applications

Once you have familiarized yourself with the touch screen monitor’s interface and customized the settings, it’s time to explore and use the applications available. These applications can vary depending on your specific requirements and the software installed. Some common applications include data monitoring, process control, and visualization tools. Refer to the user manual or seek guidance from your supervisor to understand the functionality of the installed applications.

Conclusion

Industrial touch screen monitors, such as the Frame LCD USB Open Frame Touch Monitor, offer a user-friendly and intuitive way to interact with industrial processes. By following this step-by-step guide, you can quickly set up and start using your industrial touch screen monitor. Remember to familiarize yourself with the interface, customize settings, and explore the available applications. With practice and experience, you will become proficient in utilizing the full potential of this powerful tool.

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.