CN213022213U

CN213022213U - Lower guide device of moving coil and vibration table

Info

Publication number: CN213022213U
Application number: CN202021992171.4U
Authority: CN
Inventors: 蔡爱军; 陆志强
Original assignee: Suzhou Sonic Dynamics Testing Equipment Co ltd
Current assignee: Suzhou Sonic Dynamics Testing Equipment Co ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2021-04-20
Anticipated expiration: 2030-09-11

Abstract

The utility model discloses a moving coil lower guide device, which comprises a guide shaft positioned in a moving coil and a bearing sleeved outside the guide shaft, wherein the bearing is in clearance fit with the guide shaft; the cross section of the guide shaft is arranged in a polygonal or elliptical shape and used for limiting the rotary motion of the moving coil. The utility model discloses can restrict the direction of motion of movable coil, precision when improving the shaking table test.

Description

Lower guide device of moving coil and vibration table

Technical Field

The utility model relates to a shaking table equipment field, concretely relates to guider and shaking table under movable coil.

Background

The vibration table is mainly used for detecting the acceleration of the accelerometer in the axial motion direction, so that when the moving coil is required to be excited and vibrated in the vibration table, only the axial displacement is generated, and unnecessary transverse motion is not generated. In the prior art, the acceleration vibration table generally supports the moving coil assembly in different modes such as roller type symmetrical distribution, combination of flexible materials and rigid materials and the like, so that unnecessary transverse movement is easily generated, and particularly, when the resonant frequency of the moving coil and a flexible spring is close, the moving coil can bend and swing, and further large transverse movement can be generated. The lateral movement can cause the accelerometer to detect an unnecessary value, thereby causing a larger calibration error and influencing the calibration precision of the accelerometer.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a guider and shaking table under movable coil, its direction of motion that can restrict the movable coil improves the precision when the shaking table test.

In order to solve the technical problem, the utility model provides a moving coil lower guide device, which comprises a guide shaft positioned in a moving coil and a bearing sleeved outside the guide shaft, wherein the bearing is in clearance fit with the guide shaft; the cross section of the guide shaft is arranged in a polygonal or elliptical shape and used for limiting the rotary motion of the moving coil.

Further, the bearing comprises a hydraulic bearing, the hydraulic bearing comprises an oil inlet and an oil outlet, and oil films are formed on the hydraulic bearing and the guide shaft.

Further, the precision of the clearance fit between the guide shaft and the hydraulic bearing is 8-15 μm.

Further, be provided with the sealing washer on the guiding axle, the sealing washer with the hydraulic bearing laminating.

Further, the bearing includes an air bearing, the air bearing includes an air inlet and an air outlet, and the air bearing and the guide shaft are formed with an air film.

Further, the precision of the clearance fit between the guide shaft and the air bearing is 8-15 μm.

Furthermore, the movable coil comprises a support shaft, and the guide shaft is detachably connected with the support shaft.

Further, the guide shaft includes a weight-reducing groove.

Another object of the present invention is to provide a vibration table, which includes the movable coil lower guide device.

The utility model has the advantages that:

the moving coil drives the guide shaft penetrating through the inner part to move, and at the moment, the bearing can limit the movement direction of the guide shaft through the matching between the bearing and the guide shaft, so that the accuracy of the movement direction of the moving coil is improved; the bearing is in clearance fit with the guide shaft, and the cross section of the guide shaft is arranged in a polygonal or oval shape to limit the rotary motion of the guide shaft and the moving coil, so that the precision and the stability during vibration testing are improved.

Drawings

FIG. 1 is a schematic view of an air bearing, guide shaft and moving coil of the present invention;

fig. 2 is a schematic structural view of the hydraulic bearing and the guide shaft of the present invention.

The reference numbers in the figures illustrate: 1. a guide shaft; 11. a weight reduction groove; 2. a hydraulic bearing; 21. an oil inlet; 22. an oil outlet; 23. a seal ring; 3. an air bearing; 31. an air inlet; 32. an air outlet; 4. moving coils; 41. and supporting the shaft.

Detailed Description

The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

Referring to fig. 1 and 2, an embodiment of a guiding device under a moving coil of the present invention includes a guiding shaft 1 located in a moving coil 4 and a bearing sleeved on the guiding shaft 1. The guide shaft 1 is arranged inside the moving coil 4 in a penetrating way, so that the guide shaft 1 and the moving coil 4 move synchronously. The bearing sleeve is established in the outside of guiding axle 1 to can utilize the bearing to restrict the direction of motion of guiding axle 1. For example, when carrying out the vibration test of vertical direction, the movable coil 4 drives and wears to establish the guide shaft 1 in inside and moves along vertical direction, and the bearing can restrict the direction of motion of guide shaft 1 through its cooperation between 1 with the guide shaft this moment, and then increases the accuracy of 4 directions of motion of movable coil.

The bearing is slightly in clearance fit with the guide shaft 1, and the cross section of the guide shaft 1 is in a polygonal or elliptical arrangement so as to limit the rotary motion of the guide shaft 1 and the moving coil 4. When the bearing and the external frame are fixed through the fastening screw, the guide shaft 1 is in nonstandard design, so that the guide shaft 1 can be limited to rotate along the center of the bearing by the abutting joint of the bearing and the guide shaft 1, the rotating motion of the moving coil 4 is limited, and the precision and the stability during vibration testing are improved.

The bearing comprises a hydraulic bearing 2, the hydraulic bearing 2 comprises an oil inlet 21 and an oil outlet 22, and oil films are formed on the hydraulic bearing 2 and the guide shaft 1. Hydraulic oil flows into a gap between the guide shaft 1 and the bearing inner ring through the oil inlet 21, gradually forms an oil film and is coated outside the guide shaft 1; then, the guide shaft 1 is suspended inside the bearing by controlling the oil pressure, so that the moving direction of the guide shaft 1 and the moving coil 4 can be restricted by the fluid bearing 2. In addition, the adjustment of the guide rigidity can be realized by controlling the magnitude of the oil pressure. When a test piece with a large height needs to be tested, the guiding rigidity is improved by increasing the oil pressure, so that the overturning phenomenon caused by the over-height of the gravity center of the test piece can be overcome, and the overturning resistance of the vibrating table is improved. When the mass of the piece to be tested is larger or the bearing is arranged on a vibrating table with larger test tonnage, the hydraulic bearing 2 is preferably selected as the bearing.

In addition, the precision of clearance fit of the guide shaft 1 and the hydraulic bearing 2 is 8-15 microns so as to ensure the thickness of an oil film, so that the guide shaft 1 is suspended in the bearing, the resistance of the guide shaft 1 during moving is reduced, and the oil film is controlled according to the oil pressure, so that the guide rigidity is adjusted, and the anti-overturning performance of the vibrating table is improved.

The seal ring 23 is fitted over the guide shaft 1, and the seal ring 23 is fitted to the fluid bearing 2, so that the sealing performance of the fluid bearing 2 can be improved. In this embodiment, the seal rings 23 are provided above and below the fluid bearing 2.

In another embodiment, the bearing comprises an air bearing 3, said air bearing 3 comprising an air inlet 31 and an air outlet 32, and the air bearing 3 and the guide shaft 1 are formed with an air film. Gas flows into a gap between the guide shaft 1 and the bearing inner ring through the gas inlet 31, and a gas film is gradually formed and coated outside the guide shaft 1; then, the guide shaft 1 is suspended inside the bearing by controlling the air pressure, so that the moving direction of the guide shaft 1 and the moving coil 4 can be restricted by the air bearing 3. In addition, the guiding rigidity can be adjusted by controlling the air pressure. When a test piece with a large height needs to be tested, the guiding rigidity is improved by increasing the air pressure, so that the overturning phenomenon caused by the over-height of the gravity center of the test piece can be overcome, and the overturning resistance of the vibrating table is improved. When the mass of the piece to be tested is small or the bearing is arranged on a vibration table with small test tonnage, the bearing is preferably an air bearing 3.

In addition, the precision of clearance fit of the guide shaft 1 and the air bearing 3 is 8-15 microns, so that the thickness of an air film is ensured, the guide shaft 1 is suspended in the bearing, the resistance of the guide shaft 1 during moving is reduced, and meanwhile, the air film is controlled through the size of air pressure, so that the guide rigidity is adjusted, and the anti-overturning performance of the vibrating table is improved.

The moving coil 4 includes a support shaft 41 at the center thereof, and the guide shaft 1 is detachably connected to the lower end of the support shaft 41, and the guide shaft 1 is detachably connected to the support base by a fastening screw, thereby facilitating the assembly and disassembly of the guide device. In the assembling process, the guide shaft 1 can be firstly inserted into the bearing, and then the bearing and the frame are fixed and the guide shaft 1 and the support shaft 41 are fixedly connected, so that the assembly of the guide device is completed. When the bearing and the frame are required to be disassembled, the fixing of the bearing and the frame and the fixing of the guide shaft 1 and the support shaft 41 are respectively released, and then the bearing and the guide shaft 1 are taken out and separated. By the detachable connection of the guide shaft 1 and the support shaft 41, the efficiency of assembly and disassembly can be improved; meanwhile, the movable coil 4 and the rack are prevented from being disassembled and assembled in the assembling and disassembling processes, so that the assembling and the disassembling can be facilitated.

The guide shaft 1 includes a weight-reducing groove 11, and the weight-reducing groove 11 is formed along a center line of the guide shaft 1 in the present application, so that the weight of the vibration-motion component can be reduced.

The utility model provides a shaking table, includes foretell supplementary movable coil 4's last guider, utilizes last guider can improve the anti-rotation performance and the anti-overturning performance of shaking table, has improved precision and stability when shaking table vibration test.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.

Claims

1. A lower guide device of a moving coil is characterized by comprising a guide shaft positioned in the moving coil and a bearing sleeved outside the guide shaft, wherein the bearing is in clearance fit with the guide shaft; the cross section of the guide shaft is arranged in a polygonal or elliptical shape and used for limiting the rotary motion of the moving coil.

2. The moving coil lower guide apparatus as set forth in claim 1, wherein said bearing comprises a fluid bearing, said fluid bearing includes an oil inlet and an oil outlet, and said fluid bearing and said guide shaft are formed with an oil film.

3. The moving coil lower guide apparatus according to claim 2, wherein the accuracy of the clearance fit of the guide shaft and the fluid bearing is 8 μm to 15 μm.

4. The moving coil lower guide apparatus as claimed in claim 2, wherein said guide shaft is provided with a seal ring, said seal ring being engaged with said hydraulic bearing.

5. The moving coil lower guide apparatus as claimed in claim 1, wherein said bearing comprises an air bearing, said air bearing includes an air inlet and an air outlet, and said air bearing and said guide shaft are formed with an air film.

6. The moving coil lower guide apparatus as claimed in claim 5, wherein the precision of the clearance fit of said guide shaft and said air bearing is 8 μm to 15 μm.

7. The moving coil lower guide apparatus according to claim 1, wherein said moving coil includes a support shaft, said guide shaft and said support shaft being detachably connected.

8. The moving coil lower guide apparatus as set forth in claim 1, wherein said guide shaft includes a weight-reducing slot.

9. A vibration table comprising a moving coil lower guide as claimed in any one of claims 1 to 8.