Some knowledge points about the cold and hot shock test chamber

Structure of cold and hot shock test box body

1. Structural form of the test box: The test box adopts an integral combination structure, which consists of a high-temperature test box located at the upper part, a low-temperature test box located at the lower part, a refrigeration unit cabinet located at the rear, and an electrical control cabinet (system) located on the right side. This method has a small footprint, compact structure, and beautiful appearance. The refrigeration unit is placed in an independent unit box to reduce the impact of vibration and noise during the operation of the refrigeration unit on the test box, and to facilitate the installation and maintenance of the unit. The electrical control panel is placed on the right side panel of the test box for easy operation and control

2. Outer wall material of the box: cold-rolled steel plate, surface treated with electrostatic spraying;

3. Inner wall material of the box: imported stainless steel plate (SUS304);

4. Thermal insulation material: high-temperature resistant rigid polyurethane foam+ultra-fine glass wool;

5. Door: Single door, equipped with dual silicone seals and sealing strip heating device, with self limiting heating belt to prevent condensation and frosting during testing;

6. Sample rack: A stainless steel sample rack that can move up and down and slide. The pneumatic double acting cylinder provides smooth and uniform power, and the positioning device of the sample holder adopts a magnetic field triggered travel switch;

7. Cable threading hole: A sliding cable threading tube is provided at the top of the sample rack and the high temperature test box;

Functional characteristics of cold and hot shock test chamber

1. The product has a beautiful appearance, reasonable structure, advanced technology, exquisite material selection, simple and convenient operation performance, and reliable equipment performance.

2. Adopting a unique thermal insulation structure and thermal storage effect, the test object is completely stationary during testing. The cold and hot air path switching method is applied to introduce the cold and hot temperatures into the testing area to achieve the purpose of cold and hot testing.

3. Adopting the most advanced measuring device, the controller adopts a large color LCD human-machine touch dialogue LCD human-machine interface controller, which is easy to operate, easy to learn, stable and reliable. It displays the complete system operation status, execution and program setting curves in both Chinese and English.

4. It has 96 independent test specifications, with an impact time of 999 hours and 59 minutes, and a cycle time of 1-999 times that can be set. It can achieve automatic operation of the refrigeration machine, maximize automation, reduce the workload of operators, and can automatically start and stop working at any time;

5. Equipped with fully automatic, high-precision system circuits, any component action, fully PLC locked processing, all using P I. D automatic calculation control, high temperature control accuracy.

6. Advanced scientific air circulation design ensures uniform indoor temperature and avoids any dead corners; A complete safety protection device avoids any potential safety hazards and ensures the long-term reliability of the equipment.

7. The number of cycles and defrosting times can be set for automatic (manual) defrosting.

8. The air outlet and return air outlet sensors are detected and controlled, and the switching time of the air door mechanism is completed within 10 seconds. The temperature recovery time for cold and hot shock is completed within 5 minutes.

9. During operation, the status display and curve display automatically show the fault point and cause on the screen in case of abnormal conditions, and provide troubleshooting methods. It also has an emergency shutdown device when unstable input power is detected.

10. The refrigeration system adopts a cascade high-efficiency low-temperature circuit system design. The refrigeration unit adopts imported compressors from Europe and America, and uses the green and environmentally friendly (HFC) refrigerant R507 with zero ozone coefficient, R23。

11. Super strong safety protection functions: power overload protection, leakage protection, control circuit overload, short circuit protection, compressor protection, grounding protection, over temperature protection, alarm sound prompt, etc.

Is the interior studio design of the box reasonable? Adopting a circular hollow partition frame, the spacing between test products can be controlled well; Suitable for small capacity precision testing.

13. Adopting rubber anti-static switch, the switch is comfortable and noise free; The volume structure design is reasonable, the footprint is small, and the bottom of the machine is equipped with a wheel activity device, which can move freely in the direction without obstruction.

14. The basket movement time is within 10 seconds, in compliance with MIL, LEC, JIS and other specifications.

15. The temperature recovery time for cold and hot shock is within 5 minutes, which meets the requirements of relevant national testing standards.

16. The insulation of the box is made of polyurethane foam, which is heat-resistant and will never age; And it comes with an observation window, which is easy to use and handy.

17. Heating adopts forced circulation air supply method, with rapid temperature rise and uniform distribution.

18. PID control system, dual over temperature protection, safe and reliable.

19. The temperature setting is simple and the operation is more convenient.

20. Two sets of activity disks are attached, which can be adjusted in height as desired.

Measurement and Control System for Thermal Shock Test Chamber

1. Temperature measurement: stainless steel armored Pt100 platinum resistor;

2. Control device: The main controller adopts SADAP100 control system, which uses imported German S7 series logic controller as the central processor, equipped with digital I/O module and analog I/O module, and has PID operation controller function inside. The human-machine interface (HMI) adopts imported color large screen (5.7 inches) LCD touch display screen, and the control interface adopts full Chinese display, with startup display LOGO and short and clear display of maintenance precautions for the experimental box. It can display and set test parameters, curves, total operating time, total operating time of sections, heater working status and time, etc. The programming of the control program adopts a human-machine dialogue method, with a user-friendly interface, and the automatic operation function of the refrigeration machine can be achieved by simply setting the temperature.

3. The control system uses intelligent control software system, which has the ability to automatically combine the working conditions of subsystems such as refrigeration and heating, ensuring high-precision control throughout the entire temperature range, while achieving the goal of energy conservation and consumption reduction. The perfect detection device can automatically display and alarm specific faults. For example, when the test box is abnormal, the controller displays the fault status in Chinese characters. At the same time, it has the storage function of historical data table trend charts and historical fault records.

4. System setting resolution: Temperature: 0.1 ℃; Time: 1 minute;

5. User program capacity: The system has 130 pre stored curves, each with 50 segments. Different curves can be connected and run, and each set program can run 999 times in a loop;

6. Operation mode: Program running, constant running, timed start stop;

7. Independent device working time accumulation timer.