Multi-purpose Highly Accelerated Life Test Chamber

Abstract

The present invention discloses a multi-purpose highly accelerated life test chamber, which is provided with a temperature and humidity sealed box, the temperature and humidity sealed box is connected with a quick-cut cold and heat source and a high and low air pressure source, a vibration table is provided in the temperature and humidity sealed box, the vibration table is provided with a workpiece clamping mechanism, a switching system is arranged at the bottom of the vibration table, the switching system is matched with a vibration switching mechanism and a rotation switching mechanism, the vibration table is matched with a vibration exciter through the vibration switching mechanism and / or matched with a rotation exciter through the rotation switching mechanism. Beneficial effect: The multi-purpose highly accelerated life test chamber of the present invention is provided with a replaceable excitation device on the basis of having high and low temperature rapid impact, which can meet different physical excitation modes and rotation modes, and realize various accelerated life tests such as temperature and humidity impact, physical impact and physical rotation, and has strong applicability and a wide range of applications.

Description

Technical Field

[0001] The invention relates to the field of mechanical defect detection, in particular to a multi-purpose highly accelerated life test box. Background Art

[0002] All current products need to undergo reliability tests in order to expose the weak links in the design and provide a theoretical basis for product design improvement and optimization through analysis of the causes of failures and failure modes. Improve product reliability. Traditional reliability tests test whether the product can complete the specified functions under specified conditions and within a specified time. However, the current market requirement for products is to meet any requirements of users at any time, which cannot be met by traditional reliability tests. Therefore, reliability enhancement tests have emerged. Reliability enhancement tests apply single or comprehensive environmental stresses (stress levels far exceed the normal use environment) to the tested products to quickly stimulate potential defects in the products. Improve product reliability through analysis of the causes of failures, failure modes and improved structural design. Compared with other reliability tests, reliability enhancement tests have the obvious advantages of high efficiency and low cost.

[0003] The existing equipment used for reliability enhancement experiments is called a highly accelerated life test chamber. This test chamber uses a pneumatic hammer to repeatedly impact, generate random vibration, and apply stress to the test product. This test chamber uses a single vibration mode, and the entire set of excitation devices is set in the test chamber and cannot be replaced. Therefore, the excitation mode is single and the applicability is poor. It cannot meet some special experimental requirements, such as silent requirements, large amplitude vibration requirements, etc. In order to meet these requirements, it is necessary to change to another test chamber. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a multi-purpose highly accelerated life test chamber, which is equipped with a replaceable excitation device on the basis of high and low temperature rapid impact, can meet different physical excitation modes, and has strong applicability.

[0005] The technical solution is as follows:

[0006] A multi-purpose highly accelerated life test chamber is provided with a temperature and humidity sealed box, which is connected to a quick-cut cold and heat source and a high and low pressure source. The key is that a vibration table is arranged in the temperature and humidity sealed box, and a workpiece clamping mechanism is arranged on the vibration table. A switching system is arranged at the bottom of the vibration table, and the switching system is matched with a vibration switching mechanism and / or a rotation switching mechanism.

[0007] The workpiece clamping mechanism clamps the test device, the vibration exciter in the switching system can be switched through the vibration switching mechanism, and the rotation exciter can be switched through the rotation switching mechanism. Thus, the test chamber can provide different modes of testing or combined test conditions.

[0008] In order to enable the test box to conduct both vibration experiments and rotation experiments. The vibration table is provided with an inner vibration platform and an outer ring rotating table. The outer ring rotating table is placed at the bottom of the temperature and humidity sealed box. The outer ring rotating table is a stepped table. Its outer stepped table cooperates with the bottom of the temperature and humidity sealed box, and the inner vibration platform is placed on the inner stepped table. A sealing structure is provided between the inner vibration platform and the outer ring rotating table. The sealing structure can ensure the airtightness of the temperature and humidity sealed box, prevent air from entering the box, and affect the control of the temperature, humidity and air pressure in the box.

[0009] The bottom of the inner vibration platform is matched with a vibration exciter via a vibration switching mechanism. In order to avoid the sealing structure being damaged when the rotary exciter drives the inner vibration platform to rotate, the rotary exciter drives the inner vibration platform and the outer ring rotating platform to rotate synchronously via the rotary switching mechanism.

[0010] Furthermore, a through hole is opened on the bottom of the temperature and humidity sealing box, and a limiting annular groove matching with the through hole is opened on the side wall of the outer step platform. The temperature and humidity sealing box limits the outer step platform by the limiting annular groove, and a sealing gasket is provided in the gap between the temperature and humidity sealing box and the outer ring rotating platform.

[0011] When conducting a vibration experiment, the limiting annular groove can prevent the outer ring rotating table from vibrating with the inner vibration platform, causing a gap between the outer ring rotating table and the sealing gasket, affecting the airtightness of the temperature and humidity sealing box. The sealing gasket can seal the gap between the outer ring rotating table and the temperature and humidity sealing box to ensure the airtightness of the temperature and humidity sealing box.

[0012] Furthermore, the sealing structure is an elastic sealing skin, and the elastic sealing skin is bonded to the gap between the inner vibration platform and the outer ring rotating platform.

[0013] When conducting a vibration test, the vibration exciter directly passes through the outer ring rotating table and is connected to the inner vibration platform through the vibration switching mechanism. The vibration exciter drives the inner vibration platform to vibrate. The elastic sealing skin can ensure the sealing box between the vibration platform and the outer ring rotating table, ensuring that the test box will not leak. There is also a certain extension margin, so when the vibration exciter drives the inner vibration platform to vibrate, it will not affect the vibration of the inner vibration platform.

[0014] Furthermore, the switching mechanism is either an electromagnetic switching mechanism, a pneumatic hammer switching mechanism, or a six-degree-of-freedom switching mechanism.

[0015] The electromagnetic switching mechanism is matched with the electromagnetic vibration table.

[0016] The pneumatic hammer type switching mechanism matches the pneumatic hammer type vibration table.

[0017] The six-degree-of-freedom switching mechanism matches the six-degree-of-freedom motion platform.

[0018] Furthermore, the quick-cut cold and hot sources are provided with a temperature control box, which has an air supply port and an air return port, which are respectively connected to a temperature and humidity sealing box, and a partition is provided between the air supply port and the return air port, which divides the temperature control box into a return air area and a supply air area.

[0019] A fan is arranged in the air supply area, the air outlet of the fan is opposite to the air supply outlet, the air inlet of the fan is opposite to the vent on the partition, the vent connects the return air area and the air supply area, a heater is arranged at the vent, and an evaporator is arranged in the air supply area, and the evaporator is located below the vent.

[0020] When the heater is working, the air around the heater is heated, and the hot air is fully sucked into the air supply area by the fan, and blown into the temperature and humidity sealing box by the fan to simulate the ambient temperature of the working components. The hot air returns to the return air area from the return air port, and the air is heated by the heater again. This cycle continuously transfers the heat generated by the heater to the temperature and humidity sealing box, thereby quickly raising the temperature of the humidity sealing box.

[0021] When the evaporator is working, the temperature of the air around the evaporator is absorbed, forming cold air and blown into the temperature and humidity sealed box by the fan, absorbing heat and lowering the temperature of the humidity sealed box. The cold air returns to the return air area from the return air port, and the air is again absorbed by the evaporator. This cycle continuously absorbs the heat in the temperature and humidity sealed box, thereby quickly lowering the temperature of the humidity sealed box.

[0022] Furthermore, the quick-cut cold and hot source is also provided with a liquid nitrogen nozzle, which is arranged in the temperature and humidity sealing box. The liquid nitrogen nozzle is connected to the liquid outlet of the liquid nitrogen box, and a flow control valve is arranged at the liquid outlet.

[0023] The liquid nitrogen nozzle sprays liquid nitrogen into the temperature and humidity sealed box. The vaporization of liquid nitrogen absorbs a large amount of heat, thereby rapidly reducing the temperature in the temperature and humidity sealed box. Rapid temperature changes can shorten the experimental time. The temperature in the temperature and humidity sealed box can be controlled by adjusting the opening time of the control valve, and the speed of temperature drop can be controlled by adjusting the opening of the control valve. The liquid nitrogen nozzle is a shower head, and a shower head-type nozzle helps to evenly spray liquid nitrogen, so that the entire test box is evenly cooled.

[0024] Some experiments need to be carried out under constant pressure, and the gasification of liquid nitrogen will increase the air pressure in the test box, resulting in changes in the air pressure in the temperature and humidity sealed box. In order to avoid this situation, the temperature and humidity sealed box is connected to the outside world through a pressure relief pipe, and a pressure regulating valve is provided on the pressure relief pipe. The critical air pressure of the pressure regulating valve is set. When the air pressure in the temperature and humidity sealed box exceeds the critical air pressure, the pressure regulating valve opens to relieve the pressure in the temperature and humidity sealed box, so that the temperature and humidity sealed box maintains a constant air pressure.

[0025] In order to facilitate the replacement of the vibration exciter or the rotation exciter and to facilitate the movement of the entire test box, the temperature and humidity sealing box and the quick-cut cold and hot sources are integrated and both are arranged on a lifting platform, which is arranged on a walking mechanism.

[0026] Beneficial effect: The multi-purpose highly accelerated life test chamber of the present invention is provided with a replaceable excitation device on the basis of high and low temperature rapid impact, which can meet different physical excitation modes and rotation modes, and realize various accelerated life tests such as temperature and humidity shock, physical shock and physical rotation, etc. It has strong applicability and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 It is an assembly diagram of the vibration table 3 and the temperature and humidity sealing box 1;

[0029] Figure 3 It is an assembly diagram of the electromagnetic vibration table 8a and the vibration table 3;

[0030] Figure 4 It is an assembly diagram of the air hammer type vibration table 8b and the vibration table 3;

[0031] Figure 5 It is an assembly diagram of the six-degree-of-freedom motion platform 8c and the vibration table 3;

[0032] Figure 6 It is an assembly diagram of the rotary motion exciter 8d and the inner vibration platform 3a;

[0033] Figure 7 It is an assembly diagram of the quick-cut cold and heat source 2 and the temperature and humidity sealing box 1. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the embodiments and drawings.

[0035] like Figure 1-7 As shown, a multi-purpose highly accelerated life test chamber is provided with a temperature and humidity sealed box 1, and the temperature and humidity sealed box 1 is connected to a quick-cut cold and heat source 2. The temperature and humidity sealed box 1 and the quick-cut cold and heat source 2 are integrally arranged, wherein the quick-cut cold and heat source 2 is partially installed on a lifting platform 20, and the lifting platform 20 is arranged on a walking mechanism 21. The temperature and humidity sealed box 1 is connected to the outside through a pressure relief pipe 18, and a pressure regulating valve 19 is arranged on the pressure relief pipe 18.

[0036] A vibration table 3 is provided in the temperature and humidity sealed box 1, and the vibration table 3 is provided with an inner vibration platform 3a and an outer ring rotating table 4. The outer ring rotating table 4 is placed at the bottom of the temperature and humidity sealed box 1, and the outer ring rotating table 4 is a stepped table, whose outer stepped table cooperates with the bottom of the temperature and humidity sealed box 1, and the inner vibration platform 3a is placed on the inner stepped table. A workpiece clamping mechanism for clamping the product to be tested is provided on the inner vibration platform 3a.

[0037] The temperature and humidity sealing box 1 has a through hole at the bottom, and the side wall of the outer step platform has a limiting annular groove 4a that matches the through hole. The temperature and humidity sealing box 1 limits the outer step platform through the limiting annular groove 4a, and a sealing gasket 5 is provided in the gap between the temperature and humidity sealing box 1 and the outer ring rotating platform 4.

[0038] A sealing structure is provided between the inner vibration platform 3 a and the outer ring rotating platform 4 . The sealing structure is an elastic sealing skin, and the elastic sealing skin is bonded to the gap between the inner vibration platform 3 a and the outer ring rotating platform 4 .

[0039] The bottom of the inner vibration platform 3a is matched with a vibration exciter through a vibration switching mechanism. The vibration switching mechanism is an electromagnetic switching mechanism 7a, or an air hammer switching mechanism 7b, or a six-degree-of-freedom switching mechanism 7c. The bottom of the electromagnetic switching mechanism 7a is matched with an electromagnetic vibration platform 8a. The air hammer switching mechanism 7b is matched with an air hammer vibration platform 8b. The six-degree-of-freedom switching mechanism 7c is matched with a six-degree-of-freedom motion platform 8c.

[0040] The lower part of the inner vibration platform 3a extends out of the outer ring rotating platform 4, and the lower side wall is provided with screw holes. The top of the vibration switching mechanism is provided with a mounting groove that matches the lower part of the inner vibration platform 3a. The lower part of the inner vibration platform 3a is inserted into the mounting groove and fixed by bolts. The bottom of the vibration switching mechanism is provided with a mounting fixture that matches the vibration exciter, and the vibration exciter is fixed to the bottom of the vibration switching mechanism through the mounting fixture. The vibration exciter transmits vibration to the inner vibration platform 3a through the mounting fixture.

[0041] The electromagnetic vibration table 8a corresponds to the electromagnetic table mounting fixture, the pneumatic hammer vibration table 8b corresponds to the pneumatic hammer mounting fixture, and the six-degree-of-freedom motion platform 8c corresponds to the hydraulic cylinder mounting fixture.

[0042] The bottom of the inner vibration platform 3a is also matched with a rotation exciter 8d through a rotation switching mechanism 7d. The top of the rotation switching mechanism 7d is provided with a stepped groove, the outer ring rotating platform 4 is inserted into the upper step of the stepped groove, and the inner vibration platform 3a is inserted into the lower step of the stepped groove.

[0043] The upper step portion of the stepped groove is fixed to the outer ring rotating platform 4 by bolts, and the lower step portion is also fixed to the inner vibration platform 3a by bolts.

[0044] A rotation clamp is provided at the bottom of the rotation switching mechanism 7d, and the rotation exciter is fixed to the bottom of the rotation switching mechanism 7d via the rotation clamp.

[0045] The quick-cut cold and hot source 2 is provided with a temperature control box 9, which has an air supply port 10 and an air return port 11. The air supply port 10 and the return air port 11 are respectively connected to the temperature and humidity sealing box 1. A partition 9c is provided between the air supply port 10 and the return air port 11, and the partition 9c divides the temperature control box 9 into a return air area 9a and a supply air area 9b.

[0046] A fan 12 is provided in the air supply area 9b, and the air outlet of the fan 12 is opposite to the air supply port 10, and the air inlet of the fan 12 is opposite to the vent on the partition 9c, and a heater 13 is provided at the vent. The vent connects the return air area 9a and the air supply area 9b. An evaporator 14 is provided in the air supply area 9b, and the evaporator 14 is located below the vent.

[0047] The quick-cut cold and hot source 2 is also provided with a liquid nitrogen nozzle 15, which is a shower head. The liquid nitrogen nozzle 15 is arranged in the temperature and humidity sealed box 1, and the liquid nitrogen nozzle 15 is connected to the liquid outlet of the liquid nitrogen box 16, and a flow control valve 17 is arranged at the liquid outlet.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A multi-purpose highly accelerated life test chamber, provided with a temperature and humidity sealed chamber (1), the temperature and humidity sealed chamber (1) being connected to a quick-cut hot and cold source (2) and a high and low pressure source, characterized in that: A vibration table (3) is arranged in the temperature and humidity sealed box (1), a workpiece clamping mechanism is arranged on the vibration table (3), a switching system is arranged at the bottom of the vibration table (3), and the switching system is matched with a vibration switching mechanism and / or a rotation switching mechanism; The vibration table (3) is provided with an inner vibration platform (3a) and an outer ring rotating table (4), a sealing structure is provided between the inner vibration platform (3a) and the outer ring rotating table (4), the bottom of the inner vibration platform (3a) is matched with a vibration exciter via a vibration switching mechanism, and the bottom of the outer ring rotating table (4) is matched with a rotation exciter (8d) via a rotation switching mechanism (7d); The outer ring rotating table (4) is placed on the bottom of the temperature and humidity sealed box (1); the outer ring rotating table (4) is a stepped table, the outer stepped table cooperates with the bottom of the temperature and humidity sealed box (1), and the inner vibration platform (3a) is placed on the inner stepped table.

2. The multi-purpose highly accelerated life test chamber according to claim 1, characterized in that: The bottom of the temperature and humidity sealing box (1) is provided with a through hole, and the side wall of the outer step platform of the outer ring rotating table (4) is provided with a limiting annular groove (4a) matching the through hole. The outer step platform of the outer ring rotating table (4) passes through the temperature and humidity sealing box (1) along the through hole, and the edge of the through hole extends into the limiting annular groove (4a). A sealing gasket (5) is provided in the gap between the temperature and humidity sealing box (1) and the outer ring rotating table (4).

3. The multi-purpose highly accelerated life test chamber according to claim 1, characterized in that: The sealing structure is an elastic sealing skin, which is bonded to the gap between the inner vibration platform (3a) and the outer ring rotating platform (4).

4. The multi-purpose highly accelerated life test chamber according to claim 1, characterized in that: The vibration switching mechanism is either an electromagnetic switching mechanism (7a), or a pneumatic hammer switching mechanism (7b), or a six-degree-of-freedom switching mechanism (7c); The electromagnetic switching mechanism (7a) is matched with an electromagnetic vibration table (8a); The pneumatic hammer type switching mechanism (7b) matches the pneumatic hammer type vibration table (8b); The six-degree-of-freedom switching mechanism (7c) matches the six-degree-of-freedom motion platform (8c).

5. The multi-purpose highly accelerated life test chamber according to claim 1, characterized in that: The quick-cut cold and hot source (2) is provided with a temperature control box (9), the temperature control box (9) is provided with an air supply port (10) and an air return port (11), the air supply port (10) and the air return port (11) are respectively connected to the temperature and humidity sealing box (1), a partition (9c) is provided between the air supply port (10) and the air return port (11), the partition divides the temperature control box (9) into a return air area (9a) and an air supply area (9b); A fan (12) is arranged in the air supply area (9b), the air outlet of the fan (12) is directly opposite to the air supply outlet (10), the air inlet of the fan (12) is directly opposite to the ventilation hole on the partition, a heater (13) is arranged at the ventilation hole, the ventilation hole is connected to the return air area (9a) and the air supply area (9b), and an evaporator (14) is arranged in the air supply area (9b), and the evaporator (14) is located below the ventilation hole.

6. The multi-purpose highly accelerated life test chamber according to claim 5, characterized in that: The quick-cut cold and heat source (2) is also provided with a liquid nitrogen nozzle (15), which is arranged in the temperature and humidity sealed box (1), and the liquid nitrogen nozzle (15) is connected to the liquid outlet of the liquid nitrogen box (16), and a flow control valve (17) is arranged at the liquid outlet.

7. The multi-purpose highly accelerated life test chamber according to claim 6, characterized in that: The liquid nitrogen spray head (15) is a shower head.

8. The multi-purpose highly accelerated life test chamber according to claim 6, characterized in that: The temperature and humidity sealed box (1) is connected to the outside via a pressure relief pipe (18), and a pressure regulating valve (19) is provided on the pressure relief pipe (18).

9. The multi-purpose highly accelerated life test chamber according to claim 1, characterized in that: The temperature and humidity sealing box (1) and the quick-cut cold and heat source (2) are integrally arranged and both are arranged on a lifting platform (20), and the lifting platform (20) is arranged on a walking mechanism (21).

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