Vibration test equipment
By using a metal mesh with mesh smaller than the microwave wavelength to shield the temperature sensor in the vibration test equipment, the accuracy and reliability issues of traditional detection methods in microwave environments are solved, and reliable temperature detection and safe operation of the equipment are achieved.
Patent Information
- Application Number
- CN202422105433.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-08-29
AI Technical Summary
In vibration test equipment, under microwave heating environment, traditional temperature detection methods cannot accurately measure the center temperature of the test chamber, and contact temperature detection methods are easily damaged by microwaves, affecting the normal use of the equipment.
A metal mesh cover is used to shield the temperature sensor. The metal mesh cover is made of a metal mesh with mesh openings smaller than the microwave wavelength. Combined with internal supports, it protects the sensor to avoid microwave interference and contact damage.
It achieves reliable detection of the test chamber temperature in a microwave environment, ensures that the sensor is not affected by microwaves, avoids damage, and improves detection accuracy and equipment safety.
Smart Images
Figure CN223426208U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of vibration testing technology, and in particular to a 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 vibration environments at varying temperatures, some vibration test equipment incorporates heating and cooling systems to adjust the test chamber temperature as needed.
[0003] In order to ensure the safety or monitoring requirements of vibration test equipment, it is often necessary to continuously monitor the temperature of the test chamber; and installing one or more temperature sensors in the test chamber is a common temperature monitoring solution. Due to the unique advantage of the combination of microwave heating and electric heating in ensuring temperature uniformity inside and outside the heated object, it is widely used in test equipment. However, due to the particularity of the microwave environment, temperature detection in the microwave chamber is an important and complex process, and many traditional temperature measurement methods may not be directly applicable. For example, traditional non-contact temperature measurement methods such as infrared temperature detection and optical fiber temperature detection are excluded from use because they cannot directly and accurately measure the temperature in the center of the test chamber. Another type of contact temperature detection method, such as thermocouples and thermistors, which are directly placed in the area to be measured, is easily affected by microwaves, especially in a superimposed vibration environment. They are easily damaged, thus affecting the normal use of the vibration test equipment. Utility Model Content
[0004] In order to solve the above technical problems, the purpose of this application is to provide a vibration test equipment that ensures safe and reliable temperature detection.
[0005] To this end, the present application provides a vibration testing device, comprising a test chamber suitable for housing a vibration table and for testing one or more products to be tested loaded on the vibration table, and a heating and cooling system for changing the temperature of the test chamber and / or the products to be tested loaded on the vibration table, the heating and cooling system comprising one or more microwave heaters and one or more electric heaters, the one or more microwave heaters being configured to transmit microwaves to the test chamber for heating the products to be tested, one or more temperature detection assemblies being installed in the test chamber, the temperature detection assemblies comprising: a temperature sensor located in a central portion of the test chamber; a wire electrically connected to the temperature sensor; a metal mesh cover arranged around the periphery of the temperature sensor and the wire, the metal mesh cover being made of a metal mesh having a mesh aperture smaller than the wavelength of the microwaves transmitted by the one or more microwave heaters; and an inner support member arranged inside the metal mesh cover, the inner support member being made of an insulating material and being in the shape of a hollow tube; the outer diameter of the inner support member being adapted to the inner diameter of the metal mesh cover so as to radially expand the metal mesh cover; the wire and part of the temperature sensor being located inside the inner support member.
[0006] In the above technical solution, preferably, the metal mesh cover includes a first part and a second part that can be separated from the first part, and the second part is located at the periphery of the temperature sensor.
[0007] In the above technical solution, preferably, the second part and the first part are detachably connected together through a first throat hoop.
[0008] In the above technical solution, preferably, the first part is tubular and has a first end and a second end, the second part is cap-shaped and has a closed end and an open end, and the first end and the open end are detachably connected together through the first throat hoop.
[0009] In the above technical solution, preferably, the second end of the first part is fixedly mounted on the threading hole boss of the inner wall of the test chamber through a second throat clamp.
[0010] In the above technical solution, preferably, the metal mesh is a metal woven mesh sleeve.
[0011] In the above technical solution, preferably, the inner support member is a silicone tube.
[0012] In the above technical solution, preferably, the temperature detection assembly is suspended below the top wall of the test chamber and the temperature sensor is maintained at the center of the test chamber.
[0013] In the above technical solution, preferably, a vertical pole is fixedly installed in the middle of the vibration table, the temperature detection component is tied to the vertical pole and the temperature sensor is maintained at the center of the test chamber.
[0014] In the above technical solution, preferably, the metal mesh cover is made of a metal mesh with a mesh size greater than or equal to 80. Compared with the prior art, the technical solution of this application has the following advantages: by arranging the metal mesh cover outside the temperature sensor, microwaves are scattered when passing through the mesh cover because the wavelength of microwaves is greater than or equal to the mesh size of the mesh cover, and the propagation direction and path of the microwaves are changed; therefore, the metal mesh cover can effectively shield microwaves, preventing damage to the temperature sensor and wiring harness in the microwave field; and because an internal support member is provided between the temperature sensor and the metal mesh cover, it can prevent the metal mesh covers from contacting each other in a vibrating environment and igniting. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a schematic front view of a vibration test device provided in an embodiment of the present application;
[0016] Figure 2 yes Figure 1 Schematic diagram of the internal structure of the vibration test equipment shown in;
[0017] Figure 3 1 is an exploded schematic diagram of the temperature detection assembly provided in an embodiment of the present application;
[0018] Figure 4 It is a schematic cross-sectional view along the length direction of the temperature detection component provided in an embodiment of the present application. DETAILED DESCRIPTION
[0019] 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.
[0020] See also Figure 1 、 Figure 2 , which shows an example of a vibration test equipment of the present application. The hardware architecture of the vibration test equipment 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 and cooling system.
[0021] The enclosure 1 primarily consists of a steel frame, an inner liner, an outer shell, and a polyurethane foam layer. In this example, the enclosure 1 includes a left portion 11 and a right portion 12. The interior of the left portion 11 defines a chamber (not shown) for the electrical and pneumatic systems.
[0022] Vibration table 2 consists of an upper tabletop 21, a lower tabletop 22, a tabletop core 23, and vibrating hammers 24. Vibration table 2 generates random vibrations with multiple degrees of freedom by impacting the tabletop with pneumatic hammers mounted at different angles. Vibration table 2 is mounted within the right side 12 of enclosure 1 and divides the right side 12 into two chambers: an upper chamber 13, where the product to be tested is fixedly supported on upper tabletop 21 of vibration table 2; and an lower chamber 14, where heat-resistant components can be installed.
[0023] The door body 3 consists of an upper door 31 and a lower door 32. The lower door 32 is used for installation and maintenance, while the upper door 31 is used for work. The upper and lower doors 31 and 32 primarily consist of a steel frame, an inner liner, an outer shell, a foam layer, and a lock. The upper door 31 is equipped with an observation window 311, which is made of insulating glass and effectively blocks noise. The upper door 31 is installed outside the test chamber 13, while the lower door 32 is installed outside the installation chamber 14.
[0024] The electrical and pneumatic systems will be installed in the left side portion 11 of the housing 1. The electrical components are installed in the upper portion of the left side portion 11. These components are primarily used to execute commands from the host computer to control the electrical proportional valve, which in turn causes the precision pressure reducing valve to output the required air pressure, thereby controlling the acceleration of the vibration table 2 in real time. The pneumatic system is installed in the lower portion of the left side portion 11 and is connected to the air pipe connector on the left side portion 11 via a hose to the inlet and exhaust connectors of the air hammer 24 of the vibration table 2. The pneumatic system consists of an air intake line, an air filter, a pressure reducing valve, an electrical proportional valve, a precision pressure reducing valve, an oil mist collector, an air supply line, an air return line, an air collection bag, and an exhaust purifier. The connectors of the air intake and return air collection bags are connected to the air intake and return ports located at the bottom of the housing, respectively. The electrical and pneumatic system will provide the required air pressure for the vibration table 2 in real time.
[0025] The heating and cooling system is constructed to selectively change the temperature of the test chamber 13 or the product to be tested loaded on the test table 2. In a typical example of a heating and cooling system, the heating and cooling system includes one or more electric heaters, one or more microwave heaters and a refrigeration device. The test operator adjusts the temperature of the test chamber 13 or the product to be tested to the target temperature, such as heating to 200°C or cooling to minus 100°C by manipulating the one or more electric heaters, one or more microwave heaters and the refrigeration device. Among them, the one or more electric heaters can directly heat the product to be tested, or indirectly change the temperature of the product to be tested by changing the temperature in the test chamber; the one or more microwave heaters can send microwaves into the test chamber 13 to heat the product to be tested on the vibration table 2. The one or more electric heaters, one or more microwave heaters and the refrigeration device can use conventional devices that can reach the required test temperature, which will not be described in detail here.
[0026] Continue as Figure 2 As shown, a temperature detection component 5 is installed in the test chamber 13. The temperature detection component 5 is configured to detect the temperature at the center of the test chamber 13. The temperature detection result of the temperature detection component 5 will be fed back to the control system of the test equipment.
[0027] like Figure 3 、 Figure 4 As shown, the temperature detection component 5 is mainly composed of a temperature sensor 51 , a wire 52 , a metal mesh cover 53 and an inner support 54 .
[0028] The temperature sensor 51 is a core component for temperature detection, and a contact temperature sensor such as a thermocouple, a thermal resistor, or a thermistor is selected.
[0029] The wire 52 is electrically connected to the temperature sensor 51 . The wire 52 passes through the inner wall of the test chamber 13 and is electrically connected to the control system of the device to feed back the actual temperature of the center of the test chamber 13 to the control system in real time.
[0030] The metal mesh cover 53 is disposed outside both the temperature sensor 51 and the wire 52. In this example, the metal mesh cover 53 is made of a metal mesh, preferably a woven metal mesh woven from stainless steel yarn. The mesh aperture of the metal mesh is set to be smaller than the microwave wavelength of the microwave heater. Based on this arrangement of the metal mesh cover 53, the metal mesh cover 53 can function as a microwave shield. Because the microwave wavelength of the microwave heater is greater than 1 mm, the metal mesh cover 53 can be made of a metal mesh with an aperture of less than 1 mm, such as a metal mesh with a mesh size of 80 or greater (80 mesh corresponds to a mesh diameter of 0.180 mm).
[0031] Internal support 54 is arranged inside the metal mesh cover 53. Made of insulating material and shaped like a hollow tube, its outer diameter matches the inner diameter of the metal mesh cover 53, thus radially expanding the metal mesh cover 53. Internal support 54 prevents the mesh walls of the metal mesh cover 53 from overlapping and prevents contact between the temperature sensor 51, the wire 52, and the metal mesh cover 53. Internal support 54 is preferably a silicone sleeve. The metal mesh cover 53 has a length L0 measured along its length, while internal support 54 has a length L1 measured along its length. To reduce the accuracy of temperature measurement by the temperature sensor 52, a portion of the temperature sensor 52 is exposed outside the internal support 54, meaning that the length L1 is less than the length L0. This design prevents the mesh walls of the metal mesh cover 53 from collapsing and sparks from contact between the metal mesh cover 53 and the temperature sensor in the vibration environment of the test chamber 13.
[0032] In some embodiments, the metal mesh cover 53 is composed of a first portion 531 and a second portion 532 detachable from the first portion 531, wherein the second portion 532 is disposed around the temperature sensor 51. The second portion 532 is detachably connected to the first portion 531, for example, via a hose clamp 55.
[0033] The first portion 531 is tubular and has a first end 5311 and a second end 5312 . The second portion 532 is cap-shaped and has a closed end 5321 and an open end 5322 . The first end 5311 and the open end 5322 are detachably connected together via a throat clamp 55 .
[0034] In some embodiments, the second end 5312 of the first portion 531 is fixedly mounted on the threading hole boss 131 on the inner wall of the test chamber 13 via a throat clamp 56 .
[0035] When the vibration test equipment 100 uses one or more microwave heaters to perform heating, the two parts of the metal mesh cover are fixed together using a throat clamp 55, thereby protecting the temperature sensor 51 and the electrical conductor 52. The microwaves basically do not generate electromagnetic interference to the operation of the temperature detection component, and the microwaves are shielded, and the temperature detection component will not catch fire due to heat. When the vibration test equipment 100 uses one or more electric heaters for heating, the tester can choose to loosen the throat clamp 55 and remove the second part 532 of the metal mesh cover 53. After removing the second part 532, the temperature sensor 51 is fully exposed to the test chamber 13, and its detection result is more accurate.
[0036] When the two parts of the metal mesh cover are fixed together using the throat clamp 55, the throat clamp 55 will be located on the outside of the inner support 54 and the first part 531 and the second part 532 need to be tightly connected to prevent the first part 531 and the second part 532 from being displaced in a vibration environment and causing sparks.
[0037] In some embodiments, a vertical rod 15 is provided inside the test chamber 13. The lower end of the vertical rod 15 is fixed to the vibration table 2. The temperature detection assembly 13 is fixed to the vertical rod 15 using one or more strapping bands, and the temperature sensor of the temperature detection assembly 13 is maintained in the center of the test chamber 13.
[0038] In some embodiments, the temperature detection assembly is suspended below the top wall of the test chamber 13 and the temperature sensor of the temperature detection assembly 13 is maintained at the center of the test chamber 13 .
[0039] The high-temperature vibration test equipment of the present application realizes diffraction shielding by arranging a metal mesh cover on the outside of the temperature sensor, so that the microwave energy diverges and diffuses when passing through the metal mesh cover, thereby weakening the propagation effect of the microwave and achieving a shielding effect.
[0040] 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 vibration test apparatus, comprising a test chamber adapted to house a vibration table and used to test one or more products to be tested loaded on the vibration table, and a heating and cooling system for changing the temperature of the test chamber and / or the products to be tested loaded on the vibration table, wherein the heating and cooling system comprises one or more microwave heaters and one or more electric heaters, wherein the one or more microwave heaters are configured to send microwaves into the test chamber to heat the products to be tested, and wherein one or more temperature detection components are installed in the test chamber, characterized in that: The temperature detection component includes: a temperature sensor located in the center of the test chamber; a wire electrically connected to the temperature sensor; a metal mesh cover, on which the temperature sensor and the wire are arranged, wherein the metal mesh cover is made of a metal mesh having a mesh aperture smaller than the wavelength of the microwaves emitted by the one or more microwave heaters; An inner support member is arranged on the inner side of the metal mesh cover, and the inner support member is made of insulating material and is in the shape of a hollow tube; the outer diameter of the inner support member is adapted to the inner diameter of the metal mesh cover so as to radially expand the metal mesh cover; the wires and part of the temperature sensor are located on the inner side of the inner support member.
2. The vibration test equipment according to claim 1, characterized in that The metal mesh cover includes a first part and a second part that can be separated from the first part, and the second part is located at the periphery of the temperature sensor.
3. The vibration test equipment according to claim 2, characterized in that The second part and the first part are detachably connected together through a first throat hoop.
4. The vibration test equipment according to claim 3, characterized in that: The first part is tubular and has a first end and a second end. The second part is cap-shaped and has a closed end and an open end. The first end and the open end are detachably connected together through the first throat hoop.
5. The vibration test equipment according to claim 4, characterized in that: The second end of the first part is fixedly mounted on the threading hole boss on the inner wall of the test chamber through a second throat clamp.
6. The vibration test equipment according to claim 1, characterized in that The metal mesh is a metal braided mesh sleeve.
7. The vibration test equipment according to claim 1, characterized in that The inner support member is a silicone tube.
8. The vibration test equipment according to claim 1, wherein: The temperature detection assembly is suspended below the top wall of the test chamber and the temperature sensor is maintained at the center of the test chamber.
9. The vibration test equipment according to claim 1, characterized in that A vertical pole is fixedly installed in the middle of the vibration table, the temperature detection component is tied to the vertical pole and the temperature sensor is maintained at the central position of the test chamber.
10. The vibration test equipment according to claim 1, wherein The metal mesh cover is made of a metal mesh with a mesh size greater than or equal to 80 meshes.