High-temperature vibration testing device

Abstract

The utility model provides a high-temperature vibration testing device which comprises a testing chamber suitable for being internally provided with a vibration table and used for conducting high-temperature and vibration testing on a testing product loaded on the vibration table and a heating system used for changing the temperature in the testing chamber. The heating system comprises a microwave heater and an electric heater which can send microwaves to the test chamber to change the temperature of a test product in the test chamber, the vibration table comprises a rigid table top and a plurality of vibration air hammers, and an acceleration sensor assembly is installed on the upper side of the rigid table top; the acceleration sensor assembly comprises an acceleration sensor fixedly connected to the upper side of the rigid table top, a wire electrically connected with the acceleration sensor and a microwave shielding sleeve fixedly arranged on the peripheries of the acceleration sensor and the wire, and the microwave shielding sleeve is composed of a metal net with the aperture smaller than a preset value. According to the high-temperature vibration testing device, the acceleration sensor and the wire can be prevented from being damaged or burnt in a microwave field, and the high-temperature vibration testing device can be safely used under a microwave heater.

Description

Technical Field

[0001] The present application relates to the technical field of high-temperature vibration testing, and in particular to a high-temperature vibration testing device. Background Art

[0002] Vibration test equipment, a crucial device for measuring and evaluating product vibration characteristics, is widely used in a variety of fields, including machinery, automotive, aerospace, electronics, and construction. To test product reliability in high-temperature vibration environments, some vibration test equipment incorporates a heating system to adjust the test chamber temperature as needed.

[0003] To continuously monitor the vibration environment, one or more accelerometers are installed on the vibration table in the test chamber to provide real-time information on the vibration acceleration. The combination of microwave and electric heating offers unique advantages in ensuring temperature uniformity inside and outside the heated object, making it widely used in testing equipment. However, due to the unique characteristics of the microwave environment, accelerometers are easily damaged during operation, thus affecting the proper operation of vibration testing equipment. Utility Model Content

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a high-temperature vibration testing device that can still work normally in a microwave heating environment.

[0005] To this end, the present application provides a high-temperature vibration testing device, including a test chamber suitable for housing a vibration table and for performing high-temperature and vibration tests on one or more test products loaded on the vibration table, and / or a heating system for changing the temperature of the test chamber or the test product in the test chamber, the heating system including a microwave heater and an electric heater capable of sending microwaves to the test chamber to change the temperature of the test product in the test chamber, the vibration table including a rigid table top and a plurality of vibrating air hammers installed at an inclined angle on the lower side of the rigid table top, one or more acceleration sensor assemblies installed on the upper side of the rigid table top, each of the acceleration sensor assemblies including an acceleration sensor fixedly attached to the upper side of the rigid table top, a wire electrically connected to the acceleration sensor, and a microwave shielding cover fixedly arranged on the periphery of the acceleration sensor and the wire, the microwave shielding cover being composed of a metal mesh with an aperture smaller than a preset value.

[0006] In the above technical solution, preferably, the high-temperature vibration testing device further comprises: a box body, the box body having a top wall and a peripheral side wall, the peripheral side wall being provided with a threading hole, and the wire passing through the threading hole.

[0007] In the above technical solution, preferably, the high-temperature vibration testing device further comprises a boss surrounding the threading hole provided on the peripheral side wall, and one end portion of the microwave shielding sleeve is fixed on the boss.

[0008] In the above technical solution, preferably, the high-temperature vibration testing device further includes one end portion of the microwave shielding sleeve being fixed to the boss via a first throat hoop.

[0009] In the above technical solution, preferably, the high-temperature vibration testing device also includes the acceleration sensor assembly including a sensor base, the sensor base is fixed on the upper side of the rigid table, and one end of the microwave shielding sleeve is fixed on the sensor base.

[0010] In the above technical solution, preferably, the high-temperature vibration testing device further includes one end of the microwave shielding sleeve being fixed to the sensor base through a second throat hoop.

[0011] In the above technical solution, preferably, the high temperature vibration testing device further includes a plurality of threaded mounting holes provided on the upper side of the rigid table, and the sensor base is provided with a threaded connector, which is threadedly connected to one of the threaded mounting holes.

[0012] In the above technical solution, preferably, the high-temperature vibration testing apparatus further includes each of the acceleration sensor assemblies further comprising a silicone tube, the silicone tube being positioned around the acceleration sensor and the lead wires and inside the microwave shielding sleeve. The ratio of the outer diameter of the silicone tube to the inner diameter of the microwave shielding sleeve is 0.9-1:1.

[0013] In the above technical solution, preferably, the metal mesh is a metal mesh with a mesh size greater than or equal to 80 meshes.

[0014] In the above technical solution, preferably, the metal mesh is woven from stainless steel yarns.

[0015] In the high-temperature vibration testing device of the present application, a microwave shielding sleeve made of metal mesh is provided outside the acceleration sensor and the conductive wire. When heating with a microwave heater, microwaves can be isolated outside the microwave shielding sleeve, thereby preventing the acceleration sensor and the conductive wire from being damaged or burned in the microwave field. This makes the high-temperature vibration testing device safe to use when the microwave heater is used to heat the test product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic front view of a high-temperature vibration testing device provided in an embodiment of the present application;

[0017] Figure 2 yes Figure 1 Schematic diagram of the internal structure of the high temperature vibration test device shown in;

[0018] Figure 3 is a disassembled schematic diagram of the acceleration sensor assembly provided in an embodiment of the present application;

[0019] Figure 4 This is a schematic diagram of the acceleration sensor assembly provided in an embodiment of the present application installed in a test cavity. DETAILED DESCRIPTION

[0020] The following content is merely an illustrative description of the technical solution of the present application and should not be regarded as the entirety of the present application or as a definition or limitation of the technical solution of the present application.

[0021] See also Figure 1 、 Figure 2 , which shows an example of a high-temperature vibration testing device of the present application. The hardware architecture of the high-temperature vibration testing device 100 mainly consists of main parts such as a box 1, a vibration table 2, a door body 3, an electrical and pneumatic system and a heating system (not shown in the figure).

[0022] The box body 1 is mainly composed of a box body steel frame, a box body liner, a box body shell and a box body polyurethane foam layer, etc. The box body 1 includes a top wall 101, a peripheral side wall 102 and a bottom wall 103.

[0023] The vibration table 2 includes a rigid tabletop 21 and a plurality of vibrating air hammers 22 mounted at an inclined angle on the underside of the rigid tabletop 21. A plurality of threaded mounting holes 211 are provided on the upper side of the rigid tabletop 21. The vibration table 2 generates random vibrations with multiple degrees of freedom by the impact of the vibrating air hammers 22 mounted at different angles on the rigid tabletop 21. The vibration table 2 is mounted in the middle of the housing 1 and divides the interior space of the housing 1 into two upper and lower chambers; the upper chamber is the test chamber 11, in which the product to be tested can be fixedly supported on the upper side of the rigid tabletop 2 of the vibration table 2; the lower chamber is the installation chamber 12, in which some components can be installed.

[0024] The peripheral sidewall 102 defining the upper portion of the test chamber 12 is provided with a threading hole 13 passing through the inside and outside of the test chamber 11 and a boss 14 arranged around the threading hole 13. A vertical rod 15 is fixed in the middle of the test chamber 11, the lower portion of which is fixed to the upper side of the rigid table 21.

[0025] The door body 3 is mainly composed of a door body steel frame, a door body inner liner, a door body outer shell, a door body foam layer, a door lock, etc. The upper part of the door body 3 is provided with an observation window 31 for the test operator to observe the interior of the test chamber 11. The observation window 31 is in the form of hollow glass, which can effectively block noise. The door body 3 is installed on the front side of the box body 1 and is used to close the test chamber 11 and the installation chamber 12. In some embodiments, the door body can be divided into two parts, the upper and lower parts of the door body, and the two parts of the door body are used to close the test chamber and the installation chamber respectively. The test operator can open any part of the door body as needed.

[0026] The electrical and pneumatic system will be installed in the box 1 or in a separate cabinet independent of the outside. The electrical and pneumatic system mainly includes an electrical part and a pneumatic part; the electrical part is mainly used to execute the instructions of the upper computer to control the electric proportional valve, and through the electric proportional valve, the precision pressure reducing valve outputs the required air pressure, thereby controlling the acceleration value of the vibration table 2 in real time. The pneumatic system is connected to the air inlet and exhaust joints of the vibrating hammer 22 of the vibration table 2 through a hose. The pneumatic system consists of an air intake pipe, an air filter, a pressure reducing valve, an electric proportional valve, a precision pressure reducing valve, an oil mist collector, an air supply pipe, a return air pipe, an air collecting bag, an exhaust purifier, etc., wherein the joints of the air intake and return air collecting bags are respectively connected to the air inlet and return air ports located at the bottom of the box. The electrical and pneumatic system will provide the vibration table 2 with the required air pressure in real time.

[0027] The heating system is constructed to selectively change the temperature of the test chamber 11 and the product to be tested loaded on the test table 2. In a typical example of a heating system, the heating system includes one or more electric heaters and one or more microwave heaters. The test operator adjusts the temperature of the test chamber 11 or the product to be tested to the target temperature, such as heating to 120°C, 150°C, 200°C, etc. by manipulating one or more electric heaters or one or more microwave generators. Among them, one or more microwave heaters can send microwaves into the test chamber 11 to heat the product to be tested loaded on the vibration table 2. One or more microwave generators can use conventional devices that can reach the required test temperature, which will not be described here.

[0028] Continue as Figure 2 As shown, an acceleration sensor assembly 6 is mounted on the upper side of the rigid tabletop 21. This acceleration sensor assembly 6 is configured to detect the acceleration of the vibration table 2. The acceleration detection results of the acceleration sensor assembly 6 are fed back to the control system of the testing apparatus. In other embodiments, multiple acceleration sensor assemblies may be provided to accurately measure the acceleration of various parts of the vibration table. The acceleration sensor assembly 6 can be strapped to the upright pole 15 using a strapping tape.

[0029] like Figure 3 、 Figure 4As shown, the acceleration sensor assembly 6 is mainly composed of a sensor base 61 , an acceleration sensor 62 , a wire 63 , a microwave shielding sleeve 64 and a silicone tube 65 .

[0030] Sensor base 61 has a threaded connector 611, which is threaded into a threaded mounting hole 211 on the upper side of rigid tabletop 21. Accelerometer 62 is supported by sensor base 61. Accelerometer 62, the core component for acceleration detection, can be a piezoelectric, piezoresistive, or other acceleration sensor type.

[0031] One end of the wire 63 is electrically connected to the acceleration sensor 62, and the other end of the wire 63 passes through the wire hole 13 of the peripheral side wall 102 defining the test chamber 11 and is electrically connected to the control system of the test device to feed back the real-time acceleration of the vibration table 2 to the control system in real time.

[0032] A microwave shielding sleeve 64 is positioned around the accelerometer 62 and the wire 63. In this embodiment, one end 641 of the microwave shielding sleeve 64 is secured to the sensor base 61 via a throat clamp 71, while the other end 642 of the microwave shielding sleeve 64 is secured to the boss 14 surrounding the wire threading hole 13 via a throat clamp 72. In this embodiment, the microwave shielding sleeve 64 is made of a metal mesh, preferably a metal mesh woven from stainless steel yarn. The mesh size of the metal mesh is set to be less than a preset value, which is related to the wavelength of microwaves to be emitted by the selected microwave heater; the preset value is equal to or slightly less than the wavelength of microwaves generated by the microwave heater. Based on this setting of the microwave shielding sleeve 64, the microwave shielding sleeve 64 effectively protects the wire 63 and accelerometer 62 inside the microwave heater when the microwave heater is operating. In some specific embodiments, the microwave shielding sleeve 64 is made of a metal mesh with a mesh size of less than 1 mm, such as a mesh size of 80 mesh or greater (80 mesh corresponds to a mesh diameter of 0.180 mm).

[0033] The hollow silicone tube 65 is located inside the microwave shielding sleeve 64. The outer diameter of the silicone tube 65 matches the inner diameter of the microwave shielding sleeve 64, for example, the ratio of the outer diameter of the silicone tube 65 to the inner diameter of the microwave shielding sleeve 64 is 0.9-1:1. This serves to radially expand the microwave shielding sleeve 64. The silicone tube 65 prevents the mesh walls of the microwave shielding sleeve 64 from overlapping and also prevents contact between the accelerometer 62, the wires 63, and the microwave shielding sleeve 64. This design prevents the mesh walls of the microwave shielding sleeve 64 from folding over and sparks from contact between the microwave shielding sleeve 64 and the accelerometer 62 in the vibration environment of the test chamber 11.

[0034] The high-temperature vibration testing device 100 of the present application is configured with a microwave shielding sleeve 64 on the outside of the acceleration sensor 62, thereby achieving diffraction shielding. This allows the microwave energy to diverge and diffuse when passing through the microwave shielding sleeve 64, thereby reducing the propagation effect of the microwave and achieving a shielding effect. This effectively prevents the wire 63 or the acceleration sensor 62 from catching fire, thereby ensuring the normal use of the device.

[0035] The technical scope of the present application is not limited to the contents of the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present application, and these deformations and modifications should all fall within the scope of protection of the present application.

Claims

1. A high-temperature vibration testing device, comprising a test chamber adapted to house a vibration table and for performing high-temperature and vibration testing on one or more test products loaded on the vibration table, and a heating system for changing the temperature of the test chamber and / or the test products within the test chamber, wherein the heating system comprises a microwave heater capable of transmitting microwaves into the test chamber to change the temperature of the test products within the test chamber, the vibration table comprising a rigid tabletop and a plurality of vibrating air hammers mounted at an inclined angle on the underside of the rigid tabletop, and one or more acceleration sensor assemblies mounted on the upper side of the rigid tabletop, characterized in that: Each of the acceleration sensor assemblies includes an acceleration sensor fixedly mounted on the upper side of the rigid table, a wire electrically connected to the acceleration sensor, and a microwave shielding sleeve fixedly arranged around the acceleration sensor and the wire, wherein the microwave shielding sleeve is composed of a metal mesh with an aperture smaller than a preset value.

2. The high temperature vibration testing device according to claim 1, characterized in that: Also includes: The box body has a top wall and a peripheral side wall, and the peripheral side wall is provided with a threading hole, and the wire passes through the threading hole.

3. The high temperature vibration testing device according to claim 2, characterized in that: A boss surrounding the threading hole is provided on the peripheral side wall, and one end portion of the microwave shielding sleeve is fixed on the boss.

4. The high temperature vibration testing device according to claim 3, characterized in that: One end portion of the microwave shielding sleeve is fixed to the boss through a first throat hoop.

5. The high temperature vibration testing device according to claim 1, characterized in that: The acceleration sensor assembly comprises a sensor base, which is fixed on the upper side of the rigid table, and one end of the microwave shielding sleeve is fixed on the sensor base.

6. The high temperature vibration testing device according to claim 5, characterized in that: One end portion of the microwave shielding sleeve is fixed to the sensor base through a second throat hoop.

7. The high temperature vibration testing device according to claim 5, characterized in that: A plurality of threaded mounting holes are arranged on the upper side of the rigid table, and a threaded connector is arranged on the sensor base. The threaded connector is threadedly connected to one of the threaded mounting holes.

8. The high temperature vibration testing device according to claim 1, characterized in that: Each of the acceleration sensor assemblies further includes a silicone tube, which is located outside the acceleration sensor and the wire and inside the microwave shielding sleeve, wherein the ratio of the outer diameter of the silicone tube to the inner diameter of the microwave shielding sleeve is 0.9-1:

1.

9. The high temperature vibration testing device according to claim 1, characterized in that: The metal mesh is a metal mesh with a mesh size greater than or equal to 80 meshes.

10. The high temperature vibration testing device according to claim 1, characterized in that: The metal mesh is woven from stainless steel yarns.

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