Molecular pump main shaft dynamic balance testing device

Abstract

The utility model relates to a molecular pump main shaft dynamic balance testing device, which comprises a platform, supports, a fixed seat, a motor and a driving wheel, the fixed seat is fixedly connected with the platform, the two supports are respectively arranged on the left side and the right side of the fixed seat, the supports are connected with the platform in a sliding mode, and the driving wheel is connected with the fixed seat in a rotating mode. And the motor is fixedly connected with the fixed seat and drives the driving wheel to rotate. According to the utility model, the rotating plate is rotatably connected with the fixed seat, the main shaft is buckled with the rotating plate after being placed, and then the rotating plate is fixed with the fixed seat, so that the main shaft is simple and convenient to mount and take out; for main shafts of the same specification, multiple times of adjustment are not needed, installation of the main shafts and the support can be completed only by adjusting for the first time and then rotating the hook plate to fix the clamping plate and the sliding seat, the main shafts are limited, the operation steps are few, and the efficiency of detecting multiple main shafts of the same specification is improved.

Description

Technical Field

[0001] The utility model relates to the field of a main shaft dynamic balance detection device, in particular to a main shaft dynamic balance test device for a molecular pump. Background Art

[0002] When the molecular pump rotates at high speed, if the main shaft and its components (such as turbine rotor) are not properly dynamically balanced, the unbalanced mass distribution will cause centrifugal force, which will cause additional vibration. This vibration will not only increase noise, but also cause additional mechanical stress on the pump body and other components, shortening the life of the equipment.

[0003] Therefore, before installing the molecular pump spindle, it is necessary to perform a dynamic balance test on the spindle. The existing spindle dynamic balance detection device has the following disadvantages due to the limitations of the existing structure:

[0004] 1. The spindle installation and removal procedures are complicated, which increases the time and reduces the detection efficiency. At the same time, the existing drive assembly needs to be adjusted separately when detecting spindles of different diameters, which further reduces the detection efficiency.

[0005] 2. The installation and removal steps of the two ends of the spindle and the bracket are complicated, which increases the removal time and reduces the detection efficiency. At the same time, there is sliding friction between the bracket and the end face of the spindle, and the vibration of the spindle is partially absorbed, resulting in inaccurate detection results of the vibration sensor. Utility Model Content

[0006] The utility model aims to solve the above problems and provides a molecular pump main shaft dynamic balance test device to solve the above technical problems.

[0007] A molecular pump spindle dynamic balance test device comprises: a platform, a bracket, a fixing seat, a motor and a driving wheel, wherein the fixing seat is fixedly connected to the platform, two brackets are respectively located on the left and right sides of the fixing seat, the bracket is slidably connected to the platform, the driving wheel is rotatably connected to the fixing seat, and the motor is fixedly connected to the fixing seat and drives the driving wheel to rotate.

[0008] On the basis of the above technical solution, it also includes a rotating plate, a belt, a first driven wheel, a third driven wheel and a first rotating shaft. The rotating plate is rotatably connected to the fixed seat through the first rotating shaft. A cavity is formed between the rotating plate and the fixed seat. The end of the rotating plate away from the first rotating shaft is fixed to the fixed seat through a fixing mechanism. The first driven wheel rotates relative to the fixed seat. The third driven wheel is rotatably connected to the rotating plate, and the belt contacts the driving wheel, the first driven wheel and the third driven wheel respectively.

[0009] Based on the above technical solution, the fixing mechanism includes an installation box, a second rotating shaft, a bolt and a transmission mechanism. The installation box is fixedly connected to the rotating plate, the second rotating shaft passes through the installation box and is rotatably connected to the installation box, the second rotating shaft is perpendicular to the first rotating shaft, the axis of the bolt is parallel to the first rotating shaft, and the second rotating shaft drives the bolt to move axially through the transmission mechanism to tighten the fixing seat.

[0010] On the basis of the above technical scheme, the transmission mechanism includes a nut, a first bevel gear, a second bevel gear and a limit block, the second rotating shaft is fixedly connected to the first bevel gear, the first bevel gear is meshed with the second bevel gear, the second bevel gear is fixedly connected to the nut, the rotating plate is formed with a through hole, the nut is inserted into the through hole and is rotatably connected to the through hole, the bolt is inserted into the nut and is threadedly connected to the nut, the bolt moves linearly along the axis of the nut, the limit block is fixedly connected to the rotating plate, a sliding groove is formed on the side of the bolt, the limit block is inserted into the sliding groove, and the bolt is slidably connected to the limit block.

[0011] Based on the above technical solution, the bracket includes a sliding seat, a V-shaped plate, a clamping plate, a waist-shaped plate and an L-shaped plate. Two side plates are formed above the sliding seat. The V-shaped plate is slidingly connected to the two side plates respectively, and different side plates at both ends of the clamping plate are rotatably connected and fixed; the waist-shaped plate is inserted into the groove in the middle of the clamping plate and slides up and down relative to the clamping plate, and the L-shaped plate moves left and right relative to the sliding seat.

[0012] Based on the above technical solution, the bracket also includes a hook plate, which forms a limiting groove with the side plate fixed to the clamping plate. One end of the hook plate is rotatably connected to the clamping plate, and the other end is inserted into the limiting groove.

[0013] Based on the above technical solution, the bracket also includes a first bearing, a second bearing and a third bearing. The V-shaped plate is formed with a V-shaped groove that passes through the left and right sides. The two first bearings are respectively located on both sides of the V-shaped groove. The two first bearings are respectively installed on the V-shaped plate. The second bearing is installed at the lower end of the waist plate. The axes of the first bearing and the second bearing are parallel, and the third bearing is perpendicular to the axes of the first bearing and the second bearing.

[0014] On the basis of the above technical solution, the bracket also includes an adjusting column, a fixing plate, a third screw, a third bearing and a fourth screw. The fixing plate is fixedly connected to the sliding seat, the L-shaped plate is slidably connected to the fixing plate, the fixing plate is formed with a fourth strip hole, the fourth screw passes through the fourth strip hole and is threadedly connected to the L-shaped plate, the adjusting column is slidably connected to the L-shaped plate, the adjusting column moves up and down relative to the L-shaped plate, the L-shaped plate is formed with a third strip hole, the third screw passes through the third strip hole and is threadedly connected to the adjusting column, and the third bearing is installed at the end of the adjusting column away from the third screw.

[0015] On the basis of the above technical solution, it also includes a vibration sensor and a rotation speed sensor, the rotation speed sensor is fixed relative to the platform, and the vibration sensor is fixedly connected to the bracket.

[0016] Based on the above technical solution, it also includes a frame, the platform is fixedly connected to the frame, and the front side of the frame is fixedly connected to the display.

[0017] The utility model has the following advantages:

[0018] 1. The rotating plate is rotatably connected to the fixed seat. Place the main shaft and then buckle the rotating plate, and then fix the rotating plate to the fixed seat. The installation and removal of the main shaft is simple and convenient;

[0019] 2. The arc-shaped groove can adjust the position of the bolt and adjust the position of the rotating plate relative to the fixed seat during fixing, so as to adapt to spindles of different diameters;

[0020] 3. The bolt is driven to move in a straight line through the transmission mechanism. The knob is located in front of the fixed seat of the rotating plate. The user does not need to fix the rotating plate and the fixed seat to the side. In the subsequent tests, the user can directly face the screen without changing the position, which improves the detection efficiency.

[0021] 4. For the spindle of the same specification, it is not necessary to adjust it multiple times. Only the first adjustment is needed. Then, the hook plate is turned to fix the clamping plate and the sliding seat to complete the installation of the spindle and the bracket. The spindle is limited, the operation steps are few, and the efficiency of detecting multiple spindles of the same specification is improved;

[0022] 5. The third bearing is set at the end to reduce the friction of the spindle end face, making the detection results of the vibration sensor more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only one embodiment of the utility model. For ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0024] Figure 1 : Schematic diagram of the top view of the utility model

[0025] Figure 2 : A schematic diagram of the three-dimensional structure of the utility model;

[0026] Figure 3 : The second schematic diagram of the three-dimensional structure of the utility model;

[0027] Figure 4: Schematic diagram of the three-dimensional structure of the bracket;

[0028] Figure 5 : The second schematic diagram of the three-dimensional structure of the bracket;

[0029] Figure 6 : Schematic diagram of the side structure of the bracket;

[0030] Figure 7 : Schematic diagram of the three-dimensional structure of the fixed seat and the rotating plate;

[0031] Figure 8 : The second schematic diagram of the three-dimensional structure of the fixed seat and the rotating plate;

[0032] Fig. 9 : Schematic diagram of the side structure of the fixed seat and the rotating plate;

[0033] Fig.10 :exist Fig. 9 Schematic diagram of the cross-sectional structure at AA in the middle;

[0034] Fig.11 :exist Fig.10 Schematic diagram of the local enlarged structure at point B in the middle. DETAILED DESCRIPTION

[0035] The utility model is further described below with reference to the accompanying drawings and examples:

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present invention, 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0039] Embodiment 1:

[0040] like Figures 1 to 11 As shown, this embodiment provides a molecular pump spindle dynamic balancing test device, including: a platform 1, a bracket 2, a fixed seat 3, a motor 4 and a driving wheel 31, the fixed seat 3 is fixedly connected to the platform 1, the two brackets 2 are respectively located on the left and right sides of the fixed seat 3, the bracket 2 is slidably connected to the platform 1, the driving wheel 31 is rotatably connected to the fixed seat 3, and the motor 4 is fixedly connected to the fixed seat 3 and drives the driving wheel 31 to rotate.

[0041] On the basis of the above technical scheme, it also includes a rotating plate 8, a belt 9, a first driven wheel 32, a third driven wheel 83 and a first rotating shaft 85. The rotating plate 8 is rotatably connected to the fixed seat 3 through the first rotating shaft 85. A cavity 80 is formed between the rotating plate 8 and the fixed seat 3. The end of the rotating plate 8 away from the first rotating shaft 85 is fixed to the fixed seat 3 through a fixing mechanism. The first driven wheel 32 rotates relative to the fixed seat 3. The third driven wheel 83 is rotatably connected to the rotating plate 8. The belt 9 contacts the driving wheel 31, the first driven wheel 32 and the third driven wheel 83 respectively.

[0042] Based on the above technical solution, the fixing mechanism includes an installation box 36, a second rotating shaft 37, a bolt 39 and a transmission mechanism. The installation box 36 is fixedly connected to the rotating plate 8. The second rotating shaft 37 passes through the installation box 36 and is rotatably connected to the installation box 36. The second rotating shaft 37 is perpendicular to the first rotating shaft 85. The axis of the bolt 39 is parallel to the first rotating shaft 85. The second rotating shaft 37 drives the bolt 39 to move axially through the transmission mechanism to press the fixed seat 3, thereby fixing the fixed seat 3 and the rotating plate 8.

[0043] On the basis of the above technical solution, the transmission mechanism includes a nut 38, a first bevel gear 371, a second bevel gear 381 and a stopper 841, the second rotating shaft 37 is fixedly connected to the first bevel gear 371, the first bevel gear 371 is meshed with the second bevel gear 381, the second bevel gear 381 is fixedly connected to the nut 38, the rotating plate 8 is formed with a through hole 84, the nut 38 is inserted into the through hole 84 and is rotatably connected with the through hole 84, the bolt 39 is inserted into the nut 38 and is threadedly connected with the nut 38, the bolt 39 moves linearly along the axis of the nut 38, the stopper 841 is fixedly connected to the rotating plate 8, the side of the bolt 39 is formed with a slide groove 391, the stopper 841 is inserted into the slide groove 391, and the bolt 39 is slidably connected with the stopper 841. Preferably, the diameter of the second bevel gear 381 is larger than that of the first bevel gear 371, thereby increasing the torque and pressing the bolt 39 tighter.

[0044] Based on the above technical solution, the fixing seat 3 is formed with a groove 30 with an upper opening, the groove 30 is an arc, the bolt 39 is slidably connected to the groove 30, and the diameter of the bolt 39 is equal to the width of the groove 30.

[0045] Based on the above technical solution, the fixing mechanism further includes a knob 372 , and the knob 372 is fixedly connected to the second rotating shaft 37 .

[0046] On the basis of the above technical solution, it also includes a first tensioning wheel 33, a second tensioning wheel 81, a first slider 331 and a second slider 811, the fixed seat 3 is formed with a first adjustment hole 35, the first slider 331 is slidably connected to the first adjustment hole 35, the first tensioning wheel 33 is rotatably connected to the first slider 331, the first tensioning wheel 33 is in contact with the belt 9, the rotating plate 8 is formed with a second adjustment hole 82, the second slider 811 is slidably connected to the second adjustment hole 82, the second tensioning wheel 81 is rotatably connected to the second slider 811, and the second tensioning wheel 81 is in contact with the belt 9. The first slider 331 and the second slider 811 can be respectively threadedly connected with screws, and the screws press the fixed seat 3 and the rotating plate 8 to fix the positions of the first slider 331 and the second slider 811. The first slider 331 and the second slider 811 can also be respectively connected with springs, and the other ends of the springs are respectively connected to the fixed seat 3 and the rotating plate 8. Among them, the screws and springs are not shown in the figure.

[0047] Preferably, the first adjustment hole 35 is an arc, and the second adjustment hole 82 is a straight line.

[0048] On the basis of the above technical solution, it also includes a second driven wheel 34 and a third driven wheel 83, wherein the second driven wheel 34 is rotationally connected to the fixed seat 3, the second driven wheel 34 contacts the belt 9, and the third driven wheel 83 is rotationally connected to the rotating plate 8, and the third driven wheel 83 contacts the belt 9.

[0049] On the basis of the above technical solution, it further includes a mounting plate 361 , the first driven wheel 32 is rotatably connected to the mounting plate 361 , and the mounting plate 361 is fixedly connected to the mounting box 36 .

[0050] On the basis of the above technical scheme, the bracket 2 includes a sliding seat 21, a V-shaped plate 22, a clamping plate 23, a waist plate 24 and an L-shaped plate 25. Two side plates 211 are formed above the sliding seat 21. The V-shaped plate 22 is slidingly connected to the two side plates 211 respectively. The different side plates 211 at both ends of the clamping plate 23 are rotatably connected and fixed; the waist plate 24 is inserted into the groove in the middle of the clamping plate 23 and slides up and down relative to the clamping plate 23, and the L-shaped plate 25 moves left and right relative to the sliding seat 21.

[0051] Based on the above technical solution, the bracket 2 also includes a hook plate 231, which forms a limiting groove 214 with the side plate 211 fixed with the clamping plate 23. One end of the hook plate 231 is rotatably connected to the clamping plate 23, and the other end is inserted into the limiting groove 214.

[0052] On the basis of the above technical solution, the bracket 2 also includes a first bearing 222, a second bearing 241 and a third bearing 261. The V-shaped plate 22 is formed with a V-shaped groove 221 that passes through the left and right sides. The two first bearings 222 are respectively located on both sides of the V-shaped groove 221. The two first bearings 222 are respectively installed on the V-shaped plate 22. The second bearing 241 is installed at the lower end of the waist plate 24. The axes of the first bearing 222 and the second bearing 241 are parallel, and the third bearing 261 is perpendicular to the axes of the first bearing 222 and the second bearing 241.

[0053] On the basis of the above technical solution, the bracket 2 also includes an adjusting column 26, a fixing plate 27, a third screw 252, a third bearing 261 and a fourth screw 272. The fixing plate 27 is fixedly connected to the sliding seat 21, the L-shaped plate 25 is slidably connected to the fixing plate 27, the fixing plate 27 is formed with a fourth strip hole 271, the fourth screw 272 passes through the fourth strip hole 271 and is threadedly connected to the L-shaped plate 25, the adjusting column 26 is slidably connected to the L-shaped plate 25, the adjusting column 26 moves up and down relative to the L-shaped plate 25, the L-shaped plate 25 is formed with a third strip hole 251, the third screw 252 passes through the third strip hole 251 and is threadedly connected to the adjusting column 26, and the third bearing 261 is installed at one end of the adjusting column 26 away from the third screw 252.

[0054] Based on the above technical solution, it also includes a first screw 213 and an adjusting nut 28. The side plate 211 is formed with a first strip hole 212. The first screw 213 passes through the first strip hole 212 and is threadedly connected to the V-shaped plate 22. One end of the adjusting nut 28 is threadedly connected to the sliding seat 21, and the other end contacts the bottom surface of the V-shaped plate 22.

[0055] On the basis of the above technical solution, a second screw 243 is further included. The waist-shaped plate 24 is formed with a second strip hole 242 . The second screw 243 passes through the second strip hole 242 and is threadedly connected with the clamping plate 23 .

[0056] On the basis of the above technical solution, it further comprises a rotating handle 29 and a screw rod 291 , wherein the screw rod 291 is rotatably connected to the sliding seat 21 , the rotating handle 29 is fixedly connected to the screw rod 291 , and the screw rod 291 is threadedly connected to the first nut.

[0057] Based on the above technical solution, it further comprises a vibration sensor 5 and a rotation speed sensor 6, wherein the rotation speed sensor 6 is fixed relative to the platform 1, and the vibration sensor 5 is fixedly connected to the bracket 2. Preferably, the rotation speed sensor 6 is an infrared rotation speed sensor.

[0058] On the basis of the above technical solution, it further includes a frame 10 , the platform 1 is fixedly connected to the frame 10 , and the front side of the frame 10 is fixedly connected to the display 101 .

[0059] When in use, the two brackets 2 are mounted on the platform 1 and are slidably connected to the platform 1. The platform 1 is formed with a linear slide 11, the cross section of which is convex, and the first nut is located in the linear slide 11 and is restricted from moving upward by the linear slide 11. After the bracket 2 is adjusted to the specified position, the rotating handle 29 is turned to drive the screw 291 to rotate, thereby driving the first nut to press against the inner wall of the linear slide 11, thereby fixing the bracket 2 and the platform 1. It should be noted that the first nut is not shown in the figure and slides in the up and down direction relative to the linear slide 11.

[0060] During adjustment, firstly, the adjusting nut 28 is rotated to adjust the height of the V-shaped plate 22, and then the first screw 213 is rotated to fix the sliding seat 21 and the V-shaped plate 22. Then, the end of the main shaft 7 is placed above the two first bearings 222, and the main shaft 7 contacts the outer ring of the second bearing 241. After that, the clamping plate 23 is rotated and the hook plate 231 is rotated and inserted into the limiting groove 214, so that the clamping plate 23 and the sliding seat 21 are fixed.

[0061] Slide the waist plate 24 downward until the second bearing 241 contacts the main shaft 7, and then turn the second screw 243 to fix the waist plate 24 and the clamping plate 23. Finally, slide the L-shaped plate 25 in the left-right direction and the adjustment column 26 in the up-down direction to make the third bearing 261 contact the end surface of the main shaft 7. Preferably, the third bearing 261 is perpendicular to the axis of the main shaft 7.

[0062] For the above adjustment, as long as the spindle 7 of the same specification is repeatedly tested, it is only necessary to rotate the hook plate 231 to fix the clamping plate 23 and the sliding seat 21.

[0063] During operation, both ends of the main shaft 7 are supported by the bracket 2, and the rotating plate 8 is rotated to make the belt 9 contact the middle of the main shaft 7. The first slider 331 slides in the first adjustment hole 35, and the second slider 811 slides in the second adjustment hole 82. By changing the positions of the first tensioning wheel 33 and the second tensioning wheel 81, the belt 9 is tensioned, so that the belt 9 can drive the main shaft 7 to rotate.

[0064] The rotating knob 372 is turned to drive the rotating shaft 37 to rotate, thereby driving the nut 38 to rotate, and the expanded portion of the bolt 39 moves toward the fixing seat 3 until the expanded portion of the bolt 39 presses the fixing seat 3, thereby fixing the position of the fixing seat 3 and the rotating plate 8.

[0065] Then the motor 4 is started to drive the driving wheel 31 to rotate, and the driving wheel 31 drives the main shaft 7 to rotate through the belt 9. The speed sensor 6 is aligned with the main shaft 7 to detect the actual speed of the main shaft 7. The vibration sensor installed on the bracket 2 detects the amplitude of the vibration. The speed and amplitude are displayed on the display 101 installed on the frame 10. If the vibration amplitude is too large, it means that the main shaft 7 has not reached dynamic balance.

[0066] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments, and any changes or modifications based on the present invention belong to the scope of protection required by the present invention.

Claims

1. A molecular pump spindle dynamic balance test device, characterized in that: include: A platform (1), a bracket (2), a fixed seat (3), a motor (4) and a driving wheel (31), wherein the fixed seat (3) is fixedly connected to the platform (1), two brackets (2) are respectively located on the left and right sides of the fixed seat (3), the bracket (2) is slidably connected to the platform (1), the driving wheel (31) is rotatably connected to the fixed seat (3), and the motor (4) is fixedly connected to the fixed seat (3) and drives the driving wheel (31) to rotate.

2. A molecular pump spindle dynamic balancing test device according to claim 1, characterized in that: The invention also comprises a rotating plate (8), a belt (9), a first driven wheel (32), a third driven wheel (83) and a first rotating shaft (85); the rotating plate (8) is rotatably connected to the fixed seat (3) via the first rotating shaft (85); a cavity (80) is formed between the rotating plate (8) and the fixed seat (3); one end of the rotating plate (8) away from the first rotating shaft (85) is fixed to the fixed seat (3) via a fixing mechanism; the first driven wheel (32) rotates relative to the fixed seat (3); the third driven wheel (83) is rotatably connected to the rotating plate (8); and the belt (9) is in contact with the driving wheel (31), the first driven wheel (32) and the third driven wheel (83) respectively.

3. A molecular pump spindle dynamic balancing test device according to claim 2, characterized in that: The fixing mechanism comprises an installation box (36), a second rotating shaft (37), a bolt (39) and a transmission mechanism; the installation box (36) is fixedly connected to the rotating plate (8); the second rotating shaft (37) passes through the installation box (36) and is rotationally connected to the installation box (36); the second rotating shaft (37) is perpendicular to the first rotating shaft (85); the axis of the bolt (39) is parallel to the first rotating shaft (85); the second rotating shaft (37) drives the bolt (39) to move axially through the transmission mechanism to press the fixing seat (3).

4. A molecular pump spindle dynamic balancing test device according to claim 3, characterized in that: The transmission mechanism comprises a nut (38), a first bevel gear (371), a second bevel gear (381) and a limit block (841); the second rotating shaft (37) is fixedly connected to the first bevel gear (371); the first bevel gear (371) is meshed with the second bevel gear (381); the second bevel gear (381) is fixedly connected to the nut (38); the rotating plate (8) is formed with a through hole (84); the nut (38) is inserted into the through hole (84) and is rotatably connected to the through hole (84); the bolt (39) is inserted into the nut (38) and is threadedly connected to the nut (38); the bolt (39) moves linearly along the axis of the nut (38); the limit block (841) is fixedly connected to the rotating plate (8); a sliding groove (391) is formed on the side of the bolt (39); the limit block (841) is inserted into the sliding groove (391); the bolt (39) is slidably connected to the limit block (841).

5. The molecular pump spindle dynamic balancing test device according to claim 1, characterized in that: The bracket (2) comprises a sliding seat (21), a V-shaped plate (22), a clamping plate (23), a waist plate (24) and an L-shaped plate (25); two side plates (211) are formed above the sliding seat (21); the V-shaped plate (22) is slidably connected to the two side plates (211) respectively; different side plates (211) at both ends of the clamping plate (23) are rotatably connected and fixed; the waist plate (24) is inserted into the groove in the middle of the clamping plate (23) and slides in the up and down direction relative to the clamping plate (23); the L-shaped plate (25) moves in the left and right direction relative to the sliding seat (21).

6. A molecular pump spindle dynamic balancing test device according to claim 5, characterized in that: The bracket (2) further comprises a hook plate (231) which forms a limiting groove (214) with the side plate (211) fixed with the clamping plate (23); one end of the hook plate (231) is rotatably connected to the clamping plate (23) and the other end is inserted into the limiting groove (214).

7. A molecular pump spindle dynamic balancing test device according to claim 5, characterized in that: The bracket (2) further comprises a first bearing (222), a second bearing (241) and a third bearing (261); the V-shaped plate (22) is formed with a V-shaped groove (221) which passes through the left and right sides; the two first bearings (222) are respectively located on both sides of the V-shaped groove (221); the two first bearings (222) are respectively mounted on the V-shaped plate (22); the second bearing (241) is mounted on the lower end of the waist plate (24); the axes of the first bearing (222) and the second bearing (241) are parallel; the third bearing (261) is perpendicular to the axes of the first bearing (222) and the second bearing (241).

8. A molecular pump spindle dynamic balancing test device according to claim 7, characterized in that: The bracket (2) further comprises an adjusting column (26), a fixing plate (27), a third screw (252), a third bearing (261) and a fourth screw (272); the fixing plate (27) is fixedly connected to the sliding seat (21); the L-shaped plate (25) is slidably connected to the fixing plate (27); the fixing plate (27) is formed with a fourth strip hole (271); the fourth screw (272) passes through the fourth strip hole (271) and is threadedly connected to the L-shaped plate (25); the adjusting column (26) is slidably connected to the L-shaped plate (25); the adjusting column (26) moves up and down relative to the L-shaped plate (25); the L-shaped plate (25) is formed with a third strip hole (251); the third screw (252) passes through the third strip hole (251) and is threadedly connected to the adjusting column (26); and the third bearing (261) is mounted on an end of the adjusting column (26) away from the third screw (252).

9. A molecular pump spindle dynamic balancing test device according to claim 1, characterized in that: It also includes a vibration sensor (5) and a rotation speed sensor (6), wherein the rotation speed sensor (6) is fixed relative to the platform (1), and the vibration sensor (5) is fixedly connected to the bracket (2).

10. A molecular pump spindle dynamic balancing test device according to claim 1, characterized in that: It also comprises a frame (10), the platform (1) is fixedly connected to the frame (10), and the front side of the frame (10) is fixedly connected to the display (101).

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