Vacuum vibration table and sealing vibration test device

Abstract

The utility model provides a vacuum vibration table and a sealing vibration test device, and the vacuum vibration table comprises a vibration table body, a moving coil which is connected with the vacuum table body to output vibration, a vibration pedestal which is used for supporting the vibration table body, and a trunnion which is connected with the vibration table body and the vibration pedestal. The trunnion comprises a first fixing piece fixed with the vibration table body, a second fixing piece fixed with the vibration base and an air spring propped between the first fixing piece and the second fixing piece, the first fixing piece comprises a first propping part, the second fixing piece comprises a second propping part, and the second propping part is axially positioned between the first propping part and the moving coil along the air spring; the two ends of the air spring are fixedly connected with the first abutting part and the second abutting part correspondingly. According to the vacuum vibration table and the sealed vibration test device, the first abutting part is arranged on one side, far away from the moving coil, of the second abutting part, so that negative pressure suction force received by the moving coil can be balanced.

Description

Technical Field

[0001] The utility model relates to a vacuum vibration table and a sealing vibration test device. Background Art

[0002] Vibration test is a common test method, but sometimes because of the need to simulate actual working conditions, it is necessary to provide a sealed box to create a low-pressure environment inside the sealed box so that the vibration test can be carried out in a low-pressure environment.

[0003] Since the existing vibration test bench may be used for vertical vibration test, the vibration test bench is subjected to downward force, and the ear shaft is used to balance the downward gravity of the vibration test bench. However, when facing a negative pressure test, the vibration test bench will be subjected to the adsorption force from the sealed box, so the ear shaft of the existing vibration test bench cannot solve this problem.

[0004] In view of this, it is necessary to improve the existing vacuum vibration table to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a vacuum vibration table to solve the problem that the existing vibration test table cannot balance the negative pressure adsorption force.

[0006] To achieve the above-mentioned purpose, the utility model provides a vacuum vibration table, which includes a vibration table body, a moving coil connected to the vibration table body to output vibration, a vibration base for supporting the vibration table body, and an ear shaft connecting the vibration table body and the vibration base, the ear shaft includes a first fixing member fixed to the vibration table body, a second fixing member fixed to the vibration base, and an air spring supported between the first fixing member and the second fixing member, the first fixing member includes a first supporting portion, the second fixing member includes a second supporting portion, the second supporting portion is located between the first supporting portion and the moving coil along the axial direction of the air spring, and both ends of the air spring are fixedly connected to the first supporting portion and the second supporting portion, respectively.

[0007] As a further improvement of the present invention, the first fixing member further includes a third abutting portion arranged at an end of the second abutting portion away from the first abutting portion, and the ear shaft further includes a driving spring abutted between the second abutting portion and the third abutting portion.

[0008] As a further improvement of the present invention, the third abutting portion is provided with a limiting shaft protruding toward the second abutting portion, and the driving spring is sleeved on the limiting shaft.

[0009] As a further improvement of the present invention, the first fixing member further includes a fixing portion connecting the first abutting portion and the third abutting portion, and the fixing portion is fixedly connected to the vibration table body.

[0010] As a further improvement of the present invention, the first fixing member also includes a guide shaft, which is fixedly connected to the first supporting portion and the third supporting portion. The second fixing member also includes a guide portion and a bearing, which is fixedly connected to the second supporting portion and the vibration base. The guide portion is penetrated by a guide hole for the guide shaft to pass through, and the bearing is arranged in the guide hole to resist the guide shaft.

[0011] As a further improvement of the present invention, the vibration base includes a lower base and a side fixing base protruding upward from the lower base, the side fixing base is arranged on both sides of the vibration table body, the number of the ear shafts is two, and the second fixing piece of the ear shaft is fixedly connected to the side fixing base.

[0012] As a further improvement of the present invention, the vacuum vibration table further includes an air supply unit connected to the air spring.

[0013] As a further improvement of the present invention, the vibration table body is hollow, and the vacuum vibration table further includes a vacuum pump connected to the vibration table body and a vibration controller for driving the vacuum pump to work.

[0014] The utility model also provides a sealing vibration test device, which includes a sealing box, a vacuum vibration table as described above, a test piece installation table arranged in the vacuum vibration table, and a connector connecting the test piece installation table and the moving coil.

[0015] As a further improvement of the utility model, the sealed box body includes a side wall, the side wall is provided with a connecting through hole for the connecting member to pass through, and the sealed vibration test device also includes a vibration seal for sealing the moving coil and the side wall.

[0016] The beneficial effects of the utility model are as follows: the vacuum vibration table and the sealing vibration testing device of the utility model can avoid transmitting the vibration of the vibration table body to the vibration base by setting the ear axis; and can balance the negative pressure suction force received by the moving coil by setting the first abutting portion on the side of the second abutting portion away from the moving coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the sealing vibration test device of the utility model;

[0018] Figure 2 It is a structural schematic diagram of a vacuum vibration table of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the trunnion of the vacuum vibration table of the utility model;

[0020] Figure 4 It is another angle structural schematic diagram of the trunnion of the vacuum vibration table of the utility model;

[0021] Figure 5 It is a schematic diagram of the top view of the structure of the trunnion of the vacuum vibration table of the utility model;

[0022] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure of AA. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figures 1 to 6 As shown, the sealing vibration testing device 100 of the utility model includes a sealing box 1, a vacuum vibration table 4, a vibration seal 6 connecting the vacuum vibration table 4 and the sealing box 1, a specimen mounting table 3 arranged in the sealing box 1, a connector 5 connecting the specimen mounting table 3 and the vacuum vibration table 4, and a support table 2 protruding into the sealing box 1 for supporting the specimen mounting table 3.

[0027] The sealed box body 1 comprises a side wall 11 and a bottom wall 12. The support platform 2 protrudes from the bottom wall 12 of the sealed box body 1 and extends into the sealed box body 1. The specimen mounting table 3 is slidably arranged relative to the support platform 2.

[0028] The side wall 11 is provided with a connecting through hole 111 for the connecting member 5 to pass through.

[0029] The support platform 2 includes a support platform 2 body, a horizontal slide arranged on the support platform 2 body, and a guide support member. The guide support member is fixedly connected to the specimen mounting table 3 and can be slidably arranged relative to the horizontal slide platform.

[0030] The vacuum vibration table 4 includes a vibration table body 41, a dynamic coil 42 connected to the vibration table body 41 to output vibration, a vibration base 43 for supporting the vibration table body 41, an ear shaft 44 connecting the vibration table body 41 and the vibration base 43, a vacuum pump connected to the vibration table body 41, a vibration controller 45 for driving the vacuum pump to work, a power amplifier, a cooling unit for cooling the vibration table body 41, and an air supply unit 46.

[0031] The vibration table 41 is hollow and is formed by a combination of multiple cylinders. O-rings are used to seal adjacent cylinders, so that the vibration table 41 forms a fully sealed structure. When negative pressure is formed in the sealed box 1 to generate an adsorption force on the moving coil 42, the vibration table 41 can rely on a vacuum pump to form a negative pressure to offset the adsorption force of the moving coil 42 on the sealed box 1.

[0032] The vibration controller 45 can control the operation of the vacuum pump and the air supply unit 46. The power amplifier is used to coordinate the operation of the vacuum pump, and the cooling unit is used to cool down the components of the vacuum vibration table 4.

[0033] The vibration seal 6 is used to seal the moving coil 42 and the side wall 11 .

[0034] The vibration base 43 includes a lower base 431 and a side fixing base 432 protruding upward from the lower base 431 . The side fixing base 432 is arranged on both sides of the vibration table body 41 . There are two ear shafts 44 , which are respectively connected to the side fixing bases 432 on both sides.

[0035] The ear shaft 44 includes a first fixing member 441 fixed to the vibration platform 41, a second fixing member 442 fixed to the vibration base 43, an air spring 443 supported between the first fixing member 441 and the second fixing member 442, and a driving spring 444. The second fixing member 442 of the ear shaft 44 is fixedly connected to the side fixing seat 432.

[0036] The first fixing member 441 includes a first abutting portion 4411 , a third abutting portion 4412 spaced apart from the first abutting portion 4411 along the axial direction of the moving coil 42 , a fixing portion 4413 connecting the first abutting portion 4411 and the third abutting portion 4412 , and a guide shaft 4414 .

[0037] The fixing portion 4413 is fixedly connected to the vibration platform body 41 via screws.

[0038] The first abutting portion 4411 and the third abutting portion 4412 protrude from the fixing portion 4413 toward one side of the side fixing seat 432. The first abutting portion 4411 and the third abutting portion 4412 are both provided with fixing holes 4415, and the guide shaft 4414 passes through the fixing holes 4415 and is fixedly connected to the first abutting portion 4411 and the third abutting portion 4412. In this embodiment, the number of the guide shafts 4414 is two, and they are spaced apart in the height direction.

[0039] The second fixing member 442 includes a second abutting portion 4421 , a guiding portion 4422 and a bearing 4423 .

[0040] The second abutting portion 4421 is located between the first abutting portion 4411 and the third abutting portion 4412 , and the second abutting portion 4421 is located between the first abutting portion 4411 and the moving coil 42 along the axial direction of the air spring 443 , that is, the first abutting portion 4411 is arranged on a side of the second abutting portion 4421 away from the moving coil 42 .

[0041] The two ends of the air spring 443 are respectively fixedly connected to the first abutting portion 4411 and the second abutting portion 4421. The air spring 443 has a low resonance frequency, generally around 2 Hz, and the vacuum vibration table 4 generally operates at a frequency above 5 Hz, and will not generate resonance; and the air spring 443 has a high bearing capacity, and can be adjusted by the inflation pressure.

[0042] The air supply unit 46 is used to connect with the air spring 443 to control the air supply of the air spring 443. When the air pressure in the sealed box 1 decreases, the airbag of the air spring 443 needs to be inflated; when the air pressure in the sealed box 1 increases, the airbag of the air spring 443 is deflated, so that the air spring 443 has a better vibration reduction effect. In addition, since the vibration table 41 will be affected by the negative pressure in the sealed box 1, the first abutment 4411 is set at the end of the air spring 443 away from the second abutment 4421 to offset the force on the vibration table 41.

[0043] The guide portion 4422 is fixedly connected to the second supporting portion 4421 and the vibration base 43 .

[0044] The driving spring 444 abuts between the second abutting portion 4421 and the third abutting portion 4412. When the air spring 443 is deflated, the third abutting portion 4412 is driven to move the first abutting portion 4411 toward the second abutting portion 4421, thereby causing the first abutting portion 4411 and the second abutting portion 4421 to press the air spring 443.

[0045] The third abutting portion 4412 is provided with a limiting shaft 4416 protruding toward the second abutting portion 4421 , and the driving spring 444 is sleeved on the limiting shaft 4416 to prevent the driving spring 444 from being separated.

[0046] The guide portion 4422 is penetrated by a guide hole 4424 for the guide shaft 4414 to pass through, and the bearing 4423 is disposed in the guide hole 4424 to abut against the guide shaft 4414 .

[0047] The vacuum vibration table 4 and the sealing vibration testing device 100 of the utility model can avoid transmitting the vibration of the vibration table body 41 to the vibration base 43 by setting the ear shaft 44; by setting the first abutting portion 4411 on the side of the second abutting portion 4421 away from the dynamic coil 42, the negative pressure suction force received by the dynamic coil 42 can be balanced.

[0048] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A vacuum vibration table, characterized in that: The vacuum vibration table includes a vibration table body, a moving coil connected to the vibration table body to output vibration, a vibration base for supporting the vibration table body, and an ear shaft connecting the vibration table body and the vibration base, the ear shaft includes a first fixing member fixed to the vibration table body, a second fixing member fixed to the vibration base, and an air spring supported between the first fixing member and the second fixing member, the first fixing member includes a first supporting portion, the second fixing member includes a second supporting portion, the second supporting portion is located between the first supporting portion and the moving coil along the axial direction of the air spring, and both ends of the air spring are fixedly connected to the first supporting portion and the second supporting portion, respectively.

2. The vacuum vibration table according to claim 1, characterized in that: The first fixing member further includes a third abutting portion arranged at an end of the second abutting portion away from the first abutting portion, and the ear shaft further includes a driving spring abutted between the second abutting portion and the third abutting portion.

3. The vacuum vibration table according to claim 2, characterized in that: The third abutting portion is provided with a limiting shaft protruding toward the second abutting portion, and the driving spring is sleeved on the limiting shaft.

4. The vacuum vibration table according to claim 2, characterized in that: The first fixing member further includes a fixing portion connecting the first abutting portion and the third abutting portion, and the fixing portion is fixedly connected to the vibration platform body.

5. The vacuum vibration table according to claim 2, characterized in that: The first fixing member also includes a guide shaft, which is fixedly connected to the first supporting portion and the third supporting portion. The second fixing member also includes a guide portion and a bearing, and the guide portion is fixedly connected to the second supporting portion and the vibration base. The guide portion is penetrated by a guide hole for the guide shaft to pass through, and the bearing is arranged in the guide hole to resist the guide shaft.

6. The vacuum vibration table according to claim 1, characterized in that: The vibration base includes a lower base and a side fixing base protruding upward from the lower base, the side fixing base is arranged on both sides of the vibration table body, the number of the ear shafts is two, and the second fixing piece of the ear shaft is fixedly connected to the side fixing base.

7. The vacuum vibration table according to claim 1, characterized in that: The vacuum vibration table further includes an air supply unit connected to the air spring.

8. The vacuum vibration table according to claim 1, characterized in that: The vibration table body is hollow, and the vacuum vibration table further comprises a vacuum pump connected to the vibration table body and a vibration controller for driving the vacuum pump to work.

9. A sealing vibration test device, characterized in that: The sealed vibration test device includes a sealed box, a vacuum vibration table according to any one of claims 1 to 8, a specimen mounting table disposed in the vacuum vibration table, and a connector connecting the specimen mounting table and the moving coil.

10. The seal vibration test device according to claim 9, characterized in that: The sealing box body comprises a side wall, and a connecting through hole is formed on the side wall for the connecting member to pass through. The sealing vibration test device also comprises a vibration sealing member for sealing the moving coil and the side wall.

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