Polishing and grinding device for fine machining of valve body of pneumatic valve of nitrogen making machine

Abstract

A polishing and grinding device for finish machining of a valve body of a pneumatic valve of a nitrogen making machine relates to the technical field of grinding and polishing devices and comprises a polishing and grinding workbench, the polishing and grinding workbench is a horizontally-arranged square table, and a lifting feeding and discharging assembly, an overturning clamping assembly and a two-face polishing and grinding assembly are arranged on the polishing and grinding workbench; a sliding installation opening extending transversely is formed in the middle of the upper surface of the polishing and grinding workbench, two transversely-symmetrical limiting clamping grooves are formed in each longitudinal outer end face of the polishing and grinding workbench, and an installation groove is formed between every two transversely-opposite limiting clamping grooves. According to the invention, the problems of single polishing and grinding mode, poor polishing and grinding adaptability to different parts, poor polishing and grinding adjustability, poor clamping adaptability, inconvenience in feeding and discharging transfer and the like existing in the fine machining and polishing and grinding process of the valve body of the pneumatic valve of the nitrogen making machine in the grinding and polishing equipment in the traditional technology are solved.

Description

Technical Field

[0001] The invention relates to the technical field of grinding and polishing devices, and in particular to a polishing and grinding device used for fine machining of a pneumatic valve body of a nitrogen generator. Background Art

[0002] A nitrogen generator is a device that uses air as raw material and uses physical methods to separate oxygen and nitrogen in the air to obtain nitrogen.

[0003] Most of the existing nitrogen generators are pressure swing adsorption nitrogen generators, which are nitrogen production equipment designed and manufactured according to pressure swing adsorption technology. The pressure swing adsorption nitrogen generator uses high-quality imported carbon molecular sieves as adsorbents and uses the principle of pressure swing adsorption at room temperature to separate air and produce high-purity nitrogen. The pressure swing adsorption nitrogen generator usually uses two adsorption towers in parallel when working, and the imported pneumatic valve is automatically operated by the imported PLC to alternately perform pressurized adsorption and decompression regeneration, thereby completing the separation of nitrogen and oxygen and obtaining the required high-purity nitrogen.

[0004] In terms of composition, the pressure swing adsorption nitrogen production system includes main components such as air compressor, air purification system, air storage tank, switching valve, adsorber and oxygen buffer tank, in addition to additional components such as inlet and outlet pipelines and pneumatic valves. Among them, the pneumatic valve, also known as the pneumatic pipeline valve, is a pneumatic actuator. The pneumatic valve is mainly used as the terminal control component in the fluid transportation process control system of nitrogen production equipment, oxygen production equipment and other equipment in the air separation industry. It has the characteristics of simple structure, small size and large flow rate, so it is widely used in the control system of fluid transportation process in industrial sectors such as petroleum, chemical industry, metallurgy, light industry, medicine, and electric power.

[0005] Since pneumatic valves are essentially also a type of valve parts, similar to ordinary valves, the manufacturing and processing of pneumatic valves also includes multiple processes such as blank casting, machining of valve bodies and valve internals, assembly of various components, and valve inspection. Among them, the machining of valve bodies mainly refers to the surfacing heat treatment of valve body blank castings and finishing such as grinding and polishing. The purpose of polishing and grinding is to improve the dimensional accuracy, matching angle, smoothness and matching sealing pair of the core sealing part of the valve body, so as to improve the overall sealing of the pneumatic valve.

[0006] Since the pneumatic valve body is a thin shell with two openings at both ends and a complex structure, it is necessary to polish the inner circumference and the inner end surface at the same time when polishing the sealing part. As a result, when using existing equipment to polish the pneumatic valve body, many problems often occur, including: 1. The polishing method is single, and it is impossible to achieve comprehensive polishing of multiple different parts, which is prone to residual processing dead corners.

[0007] 2. The adjustability of polishing is poor, and it is difficult to achieve adaptive polishing of the inner surface of the valve body with different diameters.

[0008] 3. The clamping adaptability to different types of valve bodies is poor, and the inside of the valve body needs to be polished from both sides of the port during the processing, which makes it difficult to select the clamping position. The setting of the clamping mechanism is easy to interfere with the feed of the polishing tool.

[0009] 4. Since the valve body is a cylindrical cylinder in appearance and needs to be clamped horizontally during the processing, the valve body is prone to rolling during the loading and unloading process, affecting the positioning accuracy.

[0010] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0011] In view of the defects in the prior art, the present invention provides a polishing device for the fine machining of the valve body of a pneumatic valve of a nitrogen generator, so as to solve the problems of the grinding and polishing equipment in the traditional technology in the process of fine machining and polishing of the valve body of a pneumatic valve of a nitrogen generator, such as a single polishing method, poor adaptability to the polishing of different parts, poor adjustability of the polishing, poor adaptability of clamping, and inconvenient loading and unloading transfer.

[0012] To achieve the above object, the present invention provides the following technical solutions: A polishing device for fine machining of a pneumatic valve body of a nitrogen generator comprises a polishing workbench which is a horizontally arranged square table on which a lifting and loading and unloading assembly, a flip clamping assembly and a two-side polishing assembly are respectively arranged.

[0013] As an optimized solution, a laterally extending sliding mounting opening is provided in the middle of the upper surface of the polishing workbench, and two laterally symmetrical limit slots are provided on each longitudinal outer end surface of the polishing workbench, and an installation groove is provided between the two laterally opposite limit slots.

[0014] As an optimized solution, a horizontal driving threaded rod is respectively provided in each of the limiting slots, and both ends of the driving threaded rod are rotatably supported on the transverse inner groove surface of the limiting slot.

[0015] As an optimized solution, a sliding drive motor is fixedly connected to the lateral inner groove surface of each mounting groove corresponding to the driving threaded rod, and the output shaft end of the sliding drive motor is fixedly connected to the lateral side end surface of the driving threaded rod.

[0016] As an optimized solution, the double-sided polishing assembly includes two symmetrically arranged sliding support frames, which are U-shaped frames extending longitudinally and opening downward. The lower ends of the sliding support frames are slidably mounted in two longitudinally opposite limit slots, and the driving threaded rod passes through and is threadedly connected to the sliding support frames.

[0017] As an optimized solution, a vertical fixed side plate is fixedly connected to the middle of the upper surface of each sliding support frame, and a rotating drive motor is fixedly connected to the lateral outer end surface of each fixed side plate. The end of the output shaft of the rotating drive motor passes through the fixed side plate and is fixedly connected to a steering disc, and the steering disc is arranged tightly against the lateral inner wall of the fixed side plate.

[0018] As an optimized solution, a horizontal polishing column is fixedly connected to the center of the outer end surface of the steering disc, and three centrally symmetrical receiving grooves are opened on the outer peripheral wall of the polishing column. A circumferential surface polishing block is telescopically provided in each of the receiving grooves, and the circumferential surface polishing block is an arc-shaped block. An electric-controlled telescopic cylinder is fixedly connected to the inner groove surface of each of the receiving grooves, and the telescopic end of the electric-controlled telescopic cylinder is fixedly connected to the back side of the corresponding circumferential surface polishing block.

[0019] As an optimized solution, an end face polishing ring is slidably provided on the outer side of the peripheral wall of each polishing processing column, and two symmetrical extension and telescopic cylinders are respectively fixedly connected to the two sides of the outer end surface of the steering disc, and the telescopic ends of the extension and telescopic cylinders are fixedly connected to the back side of the end face polishing ring.

[0020] As an optimized solution, the lifting and loading and unloading assembly includes a support base, which is a longitudinally arranged U-shaped seat with an opening facing upward, and the vertical portion of the support base is fixedly connected to the longitudinal inner groove surfaces of the two mounting grooves.

[0021] As an optimized solution, two symmetrical lifting and telescopic cylinders are fixedly connected to the inner bottom surface of the support base along the longitudinal direction, and the upper telescopic ends of the lifting and telescopic cylinders are fixedly connected to a card-mounted loading seat. The card-mounted loading seat is lifted and lowered in the sliding mounting port, and the upper surface of the card-mounted loading seat is an arc-shaped surface.

[0022] As an optimized solution, two symmetrical vertical support plates are fixedly connected to the lower surface of the polishing workbench, and the two vertical support plates are respectively arranged on both sides of the support base.

[0023] As an optimized solution, the flip clamping assembly includes two symmetrically arranged mobile bases, which are horizontally arranged L-shaped bases. The two mobile bases are slidably clamped in the sliding mounting port and are arranged on both sides of the clamping loading seat. Two symmetrical displacement telescopic cylinders are fixedly connected to each lateral inner side wall of the sliding mounting port, and the telescopic ends of the displacement telescopic cylinders are fixedly connected to the lateral side walls of the mobile base.

[0024] As an optimized solution, two longitudinally symmetrical swing hinge seats are fixedly connected to one side of the upper surface of each of the movable bases, a swing clamping plate is provided between the two swing hinge seats, and a swing drive motor is fixedly connected to the longitudinal outer end face of each of the swing hinge seats, and the output shaft end of the swing drive motor passes through the swing hinge seat and is fixed to the longitudinal side end face of the swing clamping plate.

[0025] As an optimized solution, a circular clamping avoidance opening is respectively opened in the middle of the upper surface of each swing clamping plate.

[0026] Compared with the prior art, the present invention has the following beneficial effects: The lifting loading and unloading assembly provided in the present invention can clamp and position the cylindrical valve body through the lifting clamping loading seat during the loading and unloading transfer process, thereby avoiding the problem of inaccurate positioning due to its rolling.

[0027] The flip clamping assembly provided in the present invention can perform telescopic clamping of the two ports of the pneumatic valve body from both sides through two symmetrical swing clamping plates during the polishing process. On the one hand, it can realize adaptive clamping of valve bodies of different models. On the other hand, since each swing clamping plate is respectively provided with a clamping avoidance opening, the clamping mechanism will not cause obstruction and interference to the feeding of the tool during the polishing process. Specifically, the flip clamping assembly includes two symmetrical movable bases, which can be moved laterally along the sliding mounting opening under the drive of the displacement telescopic cylinder to adjust the clamping spacing. Each movable base is respectively provided with a swing clamping plate, which can be switched between horizontal and vertical states under the control of the swing driving motor to avoid the sliding two-sided polishing assembly or realize the clamping and positioning of the valve body.

[0028] The two-sided polishing assembly provided in the present invention can simultaneously realize the polishing of the two sealing parts of the inner circumference and the inner end face of the pneumatic valve body. Specifically, the two-sided polishing assembly includes two symmetrically arranged sliding support frames, which can move laterally along the limit slot under the drive of the sliding drive motor and the driving threaded rod, and the sliding support frame is fixed with a fixed side plate, and the fixed side plate is rotatably provided with a polishing column, and the outer circumferential wall of the polishing column is provided with three centrally symmetrical receiving grooves, and each of the receiving grooves is telescopically provided with a circumferential polishing block, and the extension length of the circumferential polishing block can be adjusted by controlling the extension of the electric control telescopic cylinder, so as to adaptively polish and polish the inner circumferential surface of the valve body with different calibers; further, the outer sliding sleeve of the circumferential wall of the polishing column is provided with an end face polishing ring, and the end face polishing ring can be driven to move to the side edge of the polishing column by controlling the extension of the extension telescopic cylinder, and the inner end face of the pneumatic valve body is polished by the rotating end face polishing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0030] Figure 1 It is a schematic cross-sectional view of the internal structure of each component in the present invention in the main viewing direction; Figure 2 It is a schematic cross-sectional view of the internal structure of each component in the present invention in a top view direction; Figure 3 It is a schematic cross-sectional view of the internal structure of the lifting and loading and unloading assembly in the present invention in the side view direction; Figure 4 It is a schematic cross-sectional view of the internal structure of the flip clamp assembly in the present invention in the side view direction; Figure 5 It is a schematic cross-sectional view of the internal structure of the two-side polishing assembly in the present invention in the side view direction; Figure 6 It is a schematic diagram of the external overall structure of the present invention in the main viewing direction; Figure 7 It is a schematic diagram of the external overall structure of the present invention when viewed from above.

[0031] In the figure: 1-polishing workbench, 2-sliding installation port, 3-limiting card slot, 4-installing groove, 5-support base, 6-lifting telescopic cylinder, 7-clamping loading seat, 8-support vertical plate, 9-moving base, 10-displacement telescopic cylinder, 11-swinging hinged seat, 12-swinging clamping plate, 13-swinging drive motor, 14-clamping avoidance port, 15-driving threaded rod, 16-sliding support frame, 17-fixed side plate, 18-rotation drive motor, 19-steering disc, 20-polishing processing column, 21-storage groove, 22-circumferential polishing block, 23-electrically controlled telescopic cylinder, 24-end polishing ring, 25-extension telescopic cylinder, 26-valve body, 27-sliding drive motor. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0033] like Figures 1 to 7 As shown, a polishing device for finishing the valve body of a pneumatic valve of a nitrogen generator comprises a polishing workbench 1. The polishing workbench 1 is a horizontally arranged square table, and a lifting and loading and unloading assembly, a flip clamping assembly and a two-side polishing assembly are respectively arranged on the polishing workbench 1.

[0034] A laterally extending sliding mounting opening 2 is provided in the middle of the upper surface of the polishing workbench 1, and two laterally symmetrical limit slots 3 are provided on each longitudinal outer end surface of the polishing workbench 1, and a mounting groove 4 is provided between the two laterally opposite limit slots 3.

[0035] The lifting loading and unloading assembly comprises a support base 5 , which is a U-shaped seat arranged longitudinally and opened upwards, and the vertical portion of the support base 5 is fixedly connected to the longitudinal inner groove surfaces of the two mounting grooves 4 .

[0036] The inner bottom surface of the support base 5 is fixedly connected with two symmetrical lifting and telescopic cylinders 6 along the longitudinal direction. The upper telescopic end of the lifting and telescopic cylinder 6 is fixedly connected with a clamping loading seat 7. The clamping loading seat 7 is lifted and lowered in the sliding installation port 2, and the upper surface of the clamping loading seat 7 is an arc surface.

[0037] Two symmetrical support vertical plates 8 are fixedly connected to the lower surface of the polishing workbench 1 , and the two support vertical plates 8 are respectively arranged on both sides of the support base 5 .

[0038] The flip clamping assembly includes two symmetrically arranged mobile bases 9, which are horizontally arranged L-shaped bases. The two mobile bases 9 are slidably clamped in the sliding mounting port 2 and are arranged on both sides of the clamping loading seat 7. Two symmetrical displacement telescopic cylinders 10 are fixedly connected to each lateral inner wall of the sliding mounting port 2, and the telescopic ends of the displacement telescopic cylinders 10 are fixedly connected to the lateral side walls of the mobile base 9.

[0039] Two longitudinally symmetrical swing hinge seats 11 are fixedly connected to one side of the upper surface of each movable base 9, a swing clamping plate 12 is provided between the two swing hinge seats 11, and a swing drive motor 13 is fixedly connected to the longitudinal outer end face of each swing hinge seat 11, and the output shaft end of the swing drive motor 13 passes through the swing hinge seat 11 and is fixedly connected to the longitudinal side end face of the swing clamping plate 12.

[0040] A circular clamping avoidance opening 14 is respectively formed in the middle of the upper surface of each swing clamping plate 12 .

[0041] A horizontal driving threaded rod 15 is respectively disposed in each limiting slot 3 , and both ends of the driving threaded rod 15 are rotatably supported on the transverse inner slot surface of the limiting slot 3 .

[0042] A sliding drive motor 27 is fixedly connected to the corresponding drive threaded rod 15 on the lateral inner groove surface of each mounting groove 4 , and the output shaft end of the sliding drive motor 27 is fixedly connected to the lateral side end surface of the drive threaded rod 15 .

[0043] The double-sided polishing assembly includes two symmetrically arranged sliding support frames 16, which are U-shaped frames extending longitudinally and opening downward. The lower surface of the sliding support frame 16 is arranged in close contact with the upper surface of the polishing workbench 1, and the lower ends of the sliding support frame 16 are slidably mounted in two longitudinally opposite limit slots 3, and the driving threaded rod 15 passes through and is threadedly connected to the sliding support frame 16.

[0044] A vertical fixed side plate 17 is fixedly connected to the middle of the upper surface of each sliding support frame 16, and a rotating drive motor 18 is fixedly connected to the lateral outer end surface of each fixed side plate 17. The end of the output shaft of the rotating drive motor 18 passes through the fixed side plate 17 and is fixedly connected to a steering disc 19. The steering disc 19 is arranged close to the lateral inner wall of the fixed side plate 17.

[0045] A horizontal polishing column 20 is fixedly connected at the center of the outer end surface of the steering disc 19. Three centrally symmetrical receiving grooves 21 are opened on the outer peripheral wall of the polishing column 20. A circumferential surface polishing block 22 is telescopically provided in each receiving groove 21. The circumferential surface polishing block 22 is an arc-shaped block. An electric-controlled telescopic cylinder 23 is fixedly connected to the inner groove surface of each receiving groove 21. The telescopic end of the electric-controlled telescopic cylinder 23 is fixedly connected to the back side of the corresponding circumferential surface polishing block 22.

[0046] An end face polishing ring 24 is slidably provided on the outer side of the peripheral wall of each polishing processing column 20 , and two symmetrical extension and telescopic cylinders 25 are fixedly connected to both sides of the outer end surface of the steering disc 19 , and the telescopic ends of the extension and telescopic cylinders 25 are fixedly connected to the back side of the end face polishing ring 24 .

[0047] When the present invention is in use: first, the lifting and telescopic cylinder 6 is controlled to extend, and the clamping loading seat 7 is driven to rise as a whole above the polishing workbench 1, and the valve body 26 to be processed is placed flat on the clamping loading seat 7, and then the lifting and telescopic cylinder 6 is controlled to shorten to adjust the polishing clamping height; four swing drive motors 13 are started respectively, and the swing drive motor 13 controls the two swing clamping plates 12 to swing up to the vertical position respectively; four displacement telescopic cylinders 10 are controlled to extend respectively, and the two movable bases 9 are driven to slide horizontally along the sliding installation opening 2, and the valve body 26 is clamped and fixed from both sides by the swing clamping plates 12; four sliding drive motors 27 are started respectively, and the sliding drive motor 27 drives the driving threaded rod 15 to rotate, and then drives the two sliding support frames 16 to move closer to each other until the polishing is completed. The grinding column 20 is moved into the interior of the valve body 26 from a side port thereof, and the rotary drive motor 18 is started. The rotary drive motor 18 drives the steering disc 19 and the polishing column 20 to rotate circumferentially, and the inner circumferential wall and the inner end face of the valve body 26 are polished; during the polishing process, the electrically controlled telescopic cylinder 23 is first controlled to extend, so that the circumferential surface polishing block 22 protrudes outward, and the inner circumferential wall of the valve body 26 is rotationally polished; after the circumferential surface polishing is completed, the electrically controlled telescopic cylinder 23 is controlled to shorten, so that the circumferential surface polishing block 22 shrinks back into the receiving groove 21, and then the extending telescopic cylinder 25 is controlled to extend, and the end surface polishing ring 24 is driven to move to the side edge of the polishing column 20, and the rotary drive motor 18 is started again, and the inner end face of the valve body 26 is rotationally polished by the end surface polishing ring 24.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A polishing device for fine machining of a pneumatic valve body of a nitrogen generator, characterized in that: The polishing workbench (1) is a square table arranged horizontally, and a lifting and loading and unloading assembly, a turning and clamping assembly, and a two-side polishing assembly are respectively arranged on the polishing workbench (1); A sliding installation opening (2) extending transversely is provided in the middle of the upper surface of the polishing workbench (1), two transversely symmetrical limit slots (3) are provided on each longitudinal outer end surface of the polishing workbench (1), and a mounting groove (4) is provided between the two transversely opposite limit slots (3); A horizontal driving threaded rod (15) is respectively provided in each of the limiting slots (3), and both ends of the driving threaded rod (15) are rotatably supported on the transverse inner slot surface of the limiting slot (3); A sliding drive motor (27) is fixedly connected to the lateral inner groove surface of each mounting groove (4) corresponding to the driving threaded rod (15), and the output shaft end of the sliding drive motor (27) is fixedly connected to the lateral side end surface of the driving threaded rod (15); The two-side polishing assembly comprises two symmetrically arranged sliding support frames (16), the sliding support frames (16) being U-shaped frames extending longitudinally and opening downwards, the lower ends of the sliding support frames (16) being slidably mounted in two longitudinally opposite limiting slots (3), and the driving threaded rod (15) passing through and being threadedly connected to the sliding support frames (16); A vertical fixed side plate (17) is fixedly connected to the middle of the upper surface of each sliding support frame (16), and a rotary drive motor (18) is fixedly connected to the lateral outer end surface of each fixed side plate (17). The output shaft end of the rotary drive motor (18) passes through the fixed side plate (17) and is fixedly connected to a steering disc (19). The steering disc (19) is arranged closely against the lateral inner wall of the fixed side plate (17); A horizontal polishing column (20) is fixedly connected at the center of the outer end surface of the steering disc (19); three centrally symmetrical receiving grooves (21) are provided on the outer peripheral wall of the polishing column (20); a peripheral polishing block (22) is telescopically provided in each of the receiving grooves (21); the peripheral polishing block (22) is an arc-shaped block; an electric-controlled telescopic cylinder (23) is fixedly connected to the inner groove surface of each of the receiving grooves (21); and the telescopic end of the electric-controlled telescopic cylinder (23) is fixedly connected to the back side of the corresponding peripheral polishing block (22); An end face polishing ring (24) is slidably provided on the outer side of the peripheral wall of each polishing column (20), and two symmetrical extension and telescopic cylinders (25) are respectively fixedly connected to the two sides of the outer end face of the steering disc (19), and the telescopic ends of the extension and telescopic cylinders (25) are fixedly connected to the back side of the end face polishing ring (24).

2. A polishing device for fine machining of a pneumatic valve body of a nitrogen generator according to claim 1, characterized in that: The lifting and loading and unloading assembly comprises a support base (5), wherein the support base (5) is a U-shaped base arranged longitudinally and opening upward, and the vertical portion of the support base (5) is fixedly connected to the longitudinal inner groove surfaces of the two mounting grooves (4).

3. A polishing device for fine machining of a pneumatic valve body of a nitrogen generator according to claim 2, characterized in that: The inner bottom surface of the support base (5) is fixedly connected to two symmetrical lifting and telescopic cylinders (6) along the longitudinal direction, and the upper telescopic ends of the lifting and telescopic cylinders (6) are fixedly connected to a clamping loading seat (7). The clamping loading seat (7) is lifted and arranged in the sliding installation opening (2), and the upper surface of the clamping loading seat (7) is an arc-shaped surface.

4. A polishing device for fine machining of a pneumatic valve body of a nitrogen generator according to claim 2, characterized in that: Two symmetrical vertical support plates (8) are fixedly connected to the lower surface of the polishing workbench (1), and the two vertical support plates (8) are arranged on both sides of the support base (5).

5. The polishing device for fine machining of the pneumatic valve body of a nitrogen generator according to claim 3, characterized in that: The flip clamp assembly comprises two symmetrically arranged mobile bases (9), the mobile bases (9) being horizontally arranged L-shaped bases, the two mobile bases (9) being slidably mounted in the sliding mounting opening (2) and being arranged on both sides of the mounting loading seat (7), and two symmetrical displacement telescopic cylinders (10) being respectively fixedly connected to each lateral inner side wall of the sliding mounting opening (2), and the telescopic ends of the displacement telescopic cylinders (10) being fixedly connected to the lateral side walls of the mobile base (9).

6. A polishing device for fine machining of a pneumatic valve body of a nitrogen generator according to claim 5, characterized in that: Two longitudinally symmetrical swing hinge seats (11) are fixedly connected to one side of the upper surface of each of the movable bases (9), a swing clamping plate (12) is provided between the two swing hinge seats (11), and a swing driving motor (13) is fixedly connected to the longitudinal outer end surface of each of the swing hinge seats (11), and the output shaft end of the swing driving motor (13) passes through the swing hinge seat (11) and is fixedly connected to the longitudinal side end surface of the swing clamping plate (12).

7. A polishing device for fine machining of a pneumatic valve body of a nitrogen generator according to claim 6, characterized in that: A circular clamping avoidance opening (14) is respectively provided in the middle of the upper surface of each swing clamping plate (12).

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