Accurate grinding device for vacuum electronic tube

Abstract

The utility model relates to the technical field of vacuum electronic tubes, in particular to a vacuum electronic tube accurate grinding device which comprises a base, a clamping assembly and an accurate grinding assembly are arranged at the top of the base, the clamping assembly comprises a U-shaped plate, a bidirectional lead screw is rotationally connected to the inner side of the U-shaped plate, and two moving blocks are connected to the bidirectional lead screw in a threaded mode. Connecting vertical plates are arranged at the bottoms of the two moving blocks, detachable arc-shaped clamping plates are arranged at the positions, close to the bottoms, of the opposite side faces of the two connecting vertical plates, and rubber linings are arranged on the concave faces of the arc-shaped clamping plates. According to the fine grinding device for the vacuum electronic tube, the clamping assembly is arranged, and the rubber lining is arranged on the arc-shaped clamping plate, so that stable clamping of the vacuum tube body in the grinding process is ensured, and the situation that the grinding precision is reduced due to displacement is avoided. And the concave surface of the rubber lining is tightly attached to the outer wall of the vacuum tube body, so that the friction force is increased, and the clamping stability is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum electron tubes, in particular to a vacuum electron tube fine grinding device. Background Art

[0002] A vacuum tube is an electronic device that uses the movement of electrons in a vacuum to achieve functions such as signal amplification, rectification, and oscillation. It is widely used in communications, broadcasting, and medical equipment. A vacuum tube typically consists of a glass or metal casing, a cathode, a gate, an anode, and other supporting components. Its operating principle is to accelerate and control the movement of electrons emitted by the cathode in a vacuum environment, thereby achieving the desired electronic function. The vacuum glass tube is a key component in the manufacture of vacuum tubes. The vacuum glass tube must possess extremely high airtightness and mechanical strength to ensure the stability of the vacuum environment. To achieve this, the open end of the vacuum glass tube must be extremely smooth; otherwise, the quality of the sealing process and overall performance will be affected. Therefore, the open end of the vacuum glass tube is polished using a grinding device to achieve the required smoothness and precision, ensuring smooth subsequent processing and reliable tube performance.

[0003] The patent with publication number CN214292452U discloses a polishing device for vacuum tube production, including a device main body, a mounting plate is installed on one side of the top surface of the device main body, a driving motor is installed on the top surface of the mounting plate, the driving motor is connected to a transmission rod through a motor shaft, and the transmission rod is connected to a polishing structure through a cleaning cavity, the top surface of the device main body is fixedly connected to an adjusting box through a supporting plate, a bidirectional screw rod is passed through the middle of the adjusting box, the outer side of the bidirectional screw rod is threadedly connected to a symmetrical threaded tube, the bottom surface of the threaded tube is fixedly connected to a fixing plate, the bottom end of the fixing plate passes through the adjusting box and extends to the surface of the device main body, and a vacuum tube body is passed through the middle of the two fixing plates; the shock-absorbing spring can buffer the vacuum tube body, prevent the vacuum tube body from being worn or damaged due to excessive force, improve the safety of the vacuum tube body, and can improve the scope of application of the device main body.

[0004] The above-mentioned prior art rotates the bidirectional screw and utilizes the thread to drive the threaded tube to move the fixed plate and the spring tube, and the spring tube drives the rubber suction cup to move until the rubber suction cup is adsorbed on the surface of the vacuum tube body. As the bidirectional screw continues to move, the shock-absorbing spring, which was originally in a normal state, is forced to shrink. In the process of the shock-absorbing spring being deformed by force, the shock-absorbing spring can buffer the vacuum tube body, preventing the vacuum tube body from being worn or damaged due to excessive force. However, since the surface of the vacuum tube body is a curved surface, it is difficult for the rubber suction cup to firmly adsorb the vacuum tube body. In addition, the elastic force generated by the shock-absorbing spring is used to non-rigidly clamp the vacuum tube body, which makes the vacuum tube body easy to shift during the grinding process, thereby affecting the grinding effect. In view of this, we propose a vacuum electron tube fine grinding device. Utility Model Content

[0005] The purpose of the present invention is to provide a vacuum electron tube fine grinding device to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A vacuum tube fine grinding device includes a base, wherein a clamping assembly is provided at the top and near the left side of the base for securing the vacuum tube body to ensure that it does not shift during the grinding process. The clamping assembly includes a U-shaped plate fixedly connected to the top of the base, a bidirectional screw is rotatably connected to the inner wall of the U-shaped plate between the front and rear sides and near the top, and a driving member is provided on the front side of the U-shaped plate for driving the bidirectional screw to rotate.

[0008] Two moving blocks are threadedly connected to the bidirectional screw rod, and the bottoms of the two moving blocks are provided with connecting vertical plates. Removable arc-shaped clamping plates are provided on the opposite sides of the two connecting vertical plates and near the bottoms. The concave surfaces of the arc-shaped clamping plates are provided with rubber linings. The sizes of the arc-shaped clamping plates can be replaced according to the model of the vacuum tube body to ensure that the concave surface of the rubber lining fits tightly with the outer wall of the vacuum tube body, thereby increasing friction and improving the stability of clamping.

[0009] A fine grinding assembly is provided at the top of the base and near the right side for precision grinding of the end face of the vacuum tube. The fine grinding assembly includes a fixed vertical plate fixedly connected to the top of the base, an electric cylinder is provided on the right side of the fixed vertical plate and near the top, and the electric cylinder works with an external power supply. The movable rod of the electric cylinder passes through the right side of the fixed vertical plate and is fixedly connected to a frame. A motor is provided in the frame, and the motor works with an external power supply. The electric cylinder and the motor work with an external controller. The output shaft of the motor passes through the left side of the inner wall of the frame and is coaxially connected to a fine grinding disc. The fine grinding disc is driven to rotate by the motor. When the movable rod of the electric cylinder is extended, the fine grinding disc can be moved toward the vacuum tube body, thereby grinding the open end of the vacuum tube body.

[0010] Preferably, a sponge pad is provided on the top of the base, and the sponge pad is located between the front and rear sides of the inner wall of the U-shaped plate. When the vacuum tube body accidentally falls during disassembly and assembly, the sponge pad acts as a buffer to prevent the vacuum tube body from breaking.

[0011] Preferably, the driving member includes a rectangular shell fixedly connected to the front side of the U-shaped plate, and a worm gear is rotatably connected to the front side of the inner wall of the rectangular shell and near the top. The rear end of the worm gear shaft is coaxially connected to the front end of the bidirectional screw rod, and the bidirectional screw rod is driven to rotate by the worm gear, so that the bidirectional screw rod drives the two moving blocks to move synchronously relative to each other or in reverse, so that the two moving blocks respectively drive the two connecting vertical plates to move synchronously, and then the two connecting vertical plates respectively drive the two arc-shaped clamping plates to move synchronously to adapt to vacuum tube bodies of different sizes.

[0012] Preferably, a worm is rotatably connected between the left and right sides of the inner wall of the rectangular shell and near the bottom, and the worm is meshed with the worm wheel for transmission. A rotating wheel is rotatably connected to the left side of the rectangular shell, and the rotating shaft of the rotating wheel is coaxially connected to the rotating shaft of the worm. The staff drives the worm to rotate through the rotating wheel, so that the worm drives the worm wheel to rotate.

[0013] Preferably, a rectangular hole a is provided on the side of the connecting vertical plate near the bottom, a connecting horizontal plate is provided in the middle of the convex surface of the arc-shaped clamping plate, a rectangular hole b is provided on the top of the connecting horizontal plate, the connecting horizontal plate passes through the rectangular hole a, and an L-shaped plug is inserted into the rectangular hole b, which prevents the connecting horizontal plate from slipping out of the rectangular hole a.

[0014] Preferably, a frame-shaped limit block is provided on the outer wall of the connecting horizontal plate, and the side of the frame-shaped limit block away from the arc-shaped clamping plate is abutted against the side of the connecting vertical plate. The L-shaped plug-in block cooperates with the frame-shaped limit block to fix the position of the connecting horizontal plate and the connecting vertical plate, thereby facilitating the staff to disassemble and assemble the arc-shaped clamping plate, and facilitating the staff to replace the corresponding arc-shaped clamping plate according to the vacuum tube body of different sizes.

[0015] Preferably, two first positioning rods are provided between the front and rear sides of the inner wall of the U-shaped plate and near the top, and the moving block is slidably connected to the outer side of the first positioning rods to improve the stability of the moving block.

[0016] Preferably, the U-shaped plate is provided with an auxiliary limiting assembly to assist in fixing the vacuum tube body to prevent it from shifting during the grinding process. The auxiliary limiting assembly includes a frame-shaped fixed plate fixedly connected to the middle part of the top of the U-shaped plate, and an adjusting horizontal plate is movably connected inside the frame-shaped fixed plate. A positioning vertical plate is provided at the left end of the adjusting horizontal plate. The left and right positions of the positioning vertical plate are adjusted by adjusting the horizontal plate to adapt to vacuum tube bodies of different sizes. The right side of the positioning vertical plate is against the left end of the vacuum tube body, which effectively prevents the vacuum tube body from moving to the left during the grinding process and provides support, which is beneficial to the grinding operation.

[0017] Preferably, a clamping bolt is threadedly connected to the top of the frame-shaped fixing plate, and the threaded end of the clamping bolt abuts against the top of the adjusting horizontal plate, making it easier for staff to locate the position of the adjusting horizontal plate.

[0018] Preferably, the left sides of the front and rear sides of the frame are provided with side panels, and the right sides of the two side panels are provided with second positioning rods, and the right ends of the second positioning rods pass through the left side of the fixed vertical plate to improve the stability of the frame.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] This vacuum tube fine grinding device utilizes a clamping assembly and a rubber lining on a curved clamping plate to ensure stable clamping of the vacuum tube during grinding, preventing loss of grinding accuracy due to displacement. The concave surface of the rubber lining closely fits the outer wall of the vacuum tube, increasing friction and further improving clamping stability.

[0021] 2. This vacuum tube fine grinding device uses a motor-driven fine grinding disc to achieve high-precision end surface grinding, ensuring the smoothness and accuracy of the vacuum tube's open end, thereby improving overall performance. The movable rod of the electric cylinder precisely controls the position of the fine grinding disc, ensuring accuracy and consistency during the grinding process.

[0022] 3. This vacuum tube fine grinding device, equipped with an adjustable curved clamping plate and auxiliary limiter assembly, can adapt to vacuum tube bodies of different sizes, expanding the device's applicability. The curved clamping plate in the clamping assembly is replaceable, making it easy for operators to adjust the device to different vacuum tube models and enhancing the device's flexibility.

[0023] 4. The vacuum tube fine grinding device is provided with a sponge pad on the top of the base. When the vacuum tube body accidentally falls during the disassembly and assembly process, the sponge pad acts as a buffer, avoiding the risk of the vacuum tube body being broken and improving the safety of the overall device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of the utility model from a first perspective;

[0025] Figure 2 This is a schematic diagram of the overall structure of the utility model from a second perspective;

[0026] Figure 3 It is a partial structural diagram of the utility model;

[0027] Figure 4 It is a partial structural diagram of the clamping assembly in the present utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the driving member in the utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the fine grinding assembly in the present utility model;

[0030] In the figure: 1. Base; 2. Clamping assembly; 20. U-shaped plate; 21. Bidirectional screw; 22. Moving block; 23. Connecting vertical plate; 230. Rectangular hole a; 24. Arc-shaped clamping plate; 240. Connecting horizontal plate; 2400. Rectangular hole b; 2401. Frame-shaped limit block; 241. Rubber lining; 25. L-shaped plug; 26. First positioning rod; 3. Driving member; 30. Rectangular shell; 31. Worm gear; 32. Worm; 33. Rotating wheel; 4. Fine grinding assembly; 40. Fixed vertical plate; 41. Electric cylinder; 42. Frame; 43. Motor; 44. Fine grinding disc; 45. Side plate; 46. Second positioning rod; 5. Auxiliary limit assembly; 50. Frame-shaped fixed plate; 51. Adjusting horizontal plate; 52. Positioning vertical plate; 53. Tightening bolt; 6. Sponge pad. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships 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 should not be understood as a limitation on the present invention.

[0033] See also Figures 1-6 , the utility model provides a technical solution:

[0034] A vacuum tube fine grinding device includes a base 1. A clamping assembly 2 is provided at the top and near the left side of the base 1 for securing the vacuum tube body to ensure that it does not shift during the grinding process. The clamping assembly 2 includes a U-shaped plate 20 fixedly connected to the top of the base 1. A bidirectional screw rod 21 is rotatably connected to the inner wall of the U-shaped plate 20 between the front and rear sides and near the top. A driving member 3 is provided on the front side of the U-shaped plate 20 for driving the bidirectional screw rod 21 to rotate.

[0035] Two moving blocks 22 are threadedly connected to the bidirectional screw rod 21. The bottom of each moving block 22 is provided with a connecting vertical plate 23. Removable arc-shaped clamping plates 24 are provided on the opposite sides of the two connecting vertical plates 23 and near the bottom. The concave surface of the arc-shaped clamping plates 24 is provided with a rubber lining 241. The size of the arc-shaped clamping plates 24 can be replaced according to the model of the vacuum tube body to ensure that the concave surface of the rubber lining 241 fits tightly with the outer wall of the vacuum tube body, thereby increasing friction and improving clamping stability.

[0036] A fine grinding assembly 4 is provided at the top and near the right side of the base 1 for precision grinding of the end face of the vacuum tube. The fine grinding assembly 4 includes a fixed vertical plate 40 fixedly connected to the top of the base 1. An electric cylinder 41 is provided on the right side and near the top of the fixed vertical plate 40. The electric cylinder 41 is connected to an external power supply to work. The movable rod of the electric cylinder 41 passes through the right side of the fixed vertical plate 40 and is fixedly connected to a frame 42. A motor 43 is provided in the frame 42. The motor 43 is connected to an external power supply to work. The electric cylinder 41 and the motor 43 are connected to an external controller to work. The output shaft of the motor 43 passes through the left side of the inner wall of the frame 42 and is coaxially connected to a fine grinding disc 44. The fine grinding disc 44 is driven to rotate by the motor 43. When the movable rod of the electric cylinder 41 is extended, the fine grinding disc 44 can be moved toward the vacuum tube body, thereby grinding the open end of the vacuum tube body.

[0037] In this embodiment, a sponge pad 6 is provided on the top of the base 1, and the sponge pad 6 is located between the front and rear sides of the inner wall of the U-shaped plate 20. When the vacuum tube body accidentally falls during disassembly and assembly, the sponge pad 6 acts as a buffer, thereby preventing the vacuum tube body from breaking.

[0038] Specifically, the driving member 3 includes a rectangular shell 30 fixedly connected to the front side of the U-shaped plate 20, and a worm gear 31 is rotatably connected to the front side of the inner wall of the rectangular shell 30 and near the top. The rear end of the rotating shaft of the worm gear 31 is coaxially connected to the front end of the bidirectional screw rod 21. The bidirectional screw rod 21 is driven to rotate by the worm gear 31, so that the bidirectional screw rod 21 drives the two moving blocks 22 to move synchronously relative to each other or in the opposite direction, so that the two moving blocks 22 respectively drive the two connecting vertical plates 23 to move synchronously, and then the two connecting vertical plates 23 respectively drive the two arc-shaped clamping plates 24 to move synchronously to adapt to vacuum tube bodies of different sizes.

[0039] Furthermore, a worm 32 is rotatably connected between the left and right sides of the inner wall of the rectangular shell 30 and near the bottom. The worm 32 is engaged with the worm wheel 31 for transmission. A rotating wheel 33 is rotatably connected to the left side of the rectangular shell 30. The rotating shaft of the rotating wheel 33 is coaxially connected to the rotating shaft of the worm 32. The staff drives the worm 32 to rotate through the rotating wheel 33, so that the worm 32 drives the worm wheel 31 to rotate.

[0040] Furthermore, a rectangular hole a230 is provided on the side of the connecting vertical plate 23 near the bottom, a connecting horizontal plate 240 is provided in the middle of the convex surface of the arc-shaped clamping plate 24, and a rectangular hole b2400 is provided on the top of the connecting horizontal plate 240. The connecting horizontal plate 240 passes through the rectangular hole a230, and an L-shaped plug block 25 is inserted into the rectangular hole b2400 to prevent the connecting horizontal plate 240 from slipping out of the rectangular hole a230.

[0041] Furthermore, a frame-shaped limit block 2401 is provided on the outer wall of the connecting horizontal plate 240, and the side of the frame-shaped limit block 2401 away from the arc-shaped clamping plate 24 is against the side of the connecting vertical plate 23. The L-shaped plug 25 cooperates with the frame-shaped limit block 2401 to fix the position of the connecting horizontal plate 240 and the connecting vertical plate 23, thereby facilitating the staff to disassemble and assemble the arc-shaped clamping plate 24, and facilitating the staff to replace the corresponding arc-shaped clamping plate 24 according to the vacuum tube body of different sizes.

[0042] Furthermore, two first positioning rods 26 are symmetrically arranged between the front and rear sides of the inner wall of the U-shaped plate 20 and near the top, and the moving block 22 is slidably connected to the outer side of the first positioning rods 26 to improve the stability of the moving block 22.

[0043] Furthermore, an auxiliary limiting assembly 5 is provided on the U-shaped plate 20 to assist in fixing the vacuum tube body to prevent it from shifting during the grinding process. The auxiliary limiting assembly 5 includes a frame-shaped fixed plate 50 fixedly connected to the middle of the top of the U-shaped plate 20. An adjusting horizontal plate 51 is movably connected inside the frame-shaped fixed plate 50. A positioning vertical plate 52 is provided at the left end of the adjusting horizontal plate 51. The left and right positions of the positioning vertical plate 52 are adjusted by adjusting the horizontal plate 51 to adapt to vacuum tube bodies of different sizes. The right side of the positioning vertical plate 52 is against the left end of the vacuum tube body, which effectively prevents the vacuum tube body from moving to the left during the grinding process and provides support, which is beneficial to the grinding operation.

[0044] Furthermore, a clamping bolt 53 is threadedly connected to the top of the frame-shaped fixing plate 50 , and the threaded end of the clamping bolt 53 abuts against the top of the adjusting horizontal plate 51 , making it easier for staff to locate the position of the adjusting horizontal plate 51 .

[0045] Furthermore, side panels 45 are provided on the left sides of the front and rear sides of the frame 42, and second positioning rods 46 are provided on the right sides of the two side panels 45. The right end of the second positioning rod 46 passes through the left side of the fixed vertical plate 40 to improve the stability of the frame 42.

[0046] When the vacuum tube fine grinding device of this embodiment is in use, ensure that the base 1 of the device is placed on a stable workbench for subsequent operations; move the vacuum tube body to between the front and rear sides of the inner wall of the U-shaped plate 20, at this time, ensure that the end face of the vacuum tube body faces the fine grinding disc 44 of the fine grinding assembly 4, and drive the worm 32 to rotate by rotating the wheel 33 on the driving member 3, so that the worm wheel 31 drives the bidirectional screw rod 21 to rotate, and the bidirectional screw rod 21 drives the two moving blocks 22 to move synchronously, so that the two connecting vertical plates 23 respectively drive the two arc clamps The holding plate 24 moves synchronously until the rubber lining 241 of the arc-shaped clamping plate 24 fits tightly against the outer wall of the vacuum tube body; if the size of the vacuum tube body is different, the arc-shaped clamping plate 24 can be replaced with a suitable one. The method of disassembling and assembling the arc-shaped clamping plate 24 is to use the L-shaped plug block 25 and the frame-shaped limit block 2401 to fix the connecting horizontal plate 240 and the connecting vertical plate 23, and then use the auxiliary limit assembly 5 to further fix the vacuum tube body, adjust the adjustment horizontal plate 51 in the auxiliary limit assembly 5, so that the positioning vertical plate 52 is against the left end of the vacuum tube body to prevent During the grinding process, the vacuum tube body moves to the left, and the adjustment horizontal plate 51 is fixed in a suitable position by tightening the bolt 53. Ensure that the electric cylinder 41 and the motor 43 are connected to the external power supply and the controller, start the motor 43, and the output shaft of the motor will drive the fine grinding disc 44 to rotate. The movable rod of the electric cylinder 41 is controlled to extend, so that the fine grinding disc 44 moves toward the vacuum tube body, gradually contacting the open end of the vacuum tube body for precision grinding. After the grinding is completed, turn off the motor 43 and the electric cylinder 41; reversely rotate the wheel 33 on the driving member 3 to make the worm 32 rotate in the opposite direction. Drive the worm gear 31 to rotate in the opposite direction, so that the bidirectional screw rod 21 drives the moving block 22 to move in the opposite direction, releases the clamping of the vacuum tube body, and gently takes out the vacuum tube body. In the process of installing and disassembling the vacuum tube body, pay attention to gentle movements to avoid the vacuum tube body from falling. If it falls accidentally, the sponge pad 6 on the base 1 can act as a buffer to prevent the vacuum tube body from breaking. Through the above steps, the vacuum tube fine grinding device can be used to achieve precise grinding of the open end of the vacuum tube body to ensure its smoothness and accuracy to meet the requirements of subsequent processes.

[0047] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A vacuum electron tube fine grinding device, comprising a base (1), characterized in that: A clamping assembly (2) is provided at the top of the base (1) and near the left side. The clamping assembly (2) includes a U-shaped plate (20) fixedly connected to the top of the base (1). A bidirectional screw rod (21) is rotatably connected between the front and rear sides of the inner wall of the U-shaped plate (20) and near the top. A driving member (3) for driving the bidirectional screw rod (21) to rotate is provided on the front side of the U-shaped plate (20). Two moving blocks (22) are threadedly connected to the bidirectional screw rod (21). The bottoms of the two moving blocks (22) are both provided with connecting vertical plates (23). The opposite sides of the two connecting vertical plates (23) and near the bottom are both provided with detachable arc-shaped A clamping plate (24), the concave surface of the arc-shaped clamping plate (24) is provided with a rubber lining (241), a fine grinding assembly (4) is provided at the top of the base (1) and near the right side, the fine grinding assembly (4) comprises a fixed vertical plate (40) fixedly connected to the top of the base (1), an electric cylinder (41) is provided on the right side of the fixed vertical plate (40) and near the top, a movable rod of the electric cylinder (41) passes through the right side of the fixed vertical plate (40) and is fixedly connected to a frame (42), a motor (43) is provided in the frame (42), an output shaft of the motor (43) passes through the left side of the inner wall of the frame (42) and is coaxially connected to a fine grinding disc (44).

2. The vacuum electron tube polishing device according to claim 1, characterized in that: A sponge pad (6) is provided on the top of the base (1), and the sponge pad (6) is located between the front and rear sides of the inner wall of the U-shaped plate (20).

3. The vacuum tube polishing device according to claim 1, characterized in that: The driving member (3) comprises a rectangular housing (30) fixedly connected to the front side of the U-shaped plate (20), a worm gear (31) being rotatably connected to the front side of the inner wall of the rectangular housing (30) and near the top, and a rear end of the rotating shaft of the worm gear (31) being coaxially connected to the front end of the bidirectional screw rod (21).

4. The vacuum tube fine grinding device according to claim 3, characterized in that: A worm (32) is rotatably connected between the left and right sides of the inner wall of the rectangular housing (30) and near the bottom. The worm (32) is meshed with the worm wheel (31) for transmission. A rotating wheel (33) is rotatably connected to the left side of the rectangular housing (30). The rotating shaft of the rotating wheel (33) is coaxially connected to the rotating shaft of the worm (32).

5. The vacuum electron tube polishing device according to claim 1, characterized in that: A rectangular hole a (230) is provided on the side of the connecting vertical plate (23) near the bottom, a connecting horizontal plate (240) is provided in the middle of the convex surface of the arc-shaped clamping plate (24), a rectangular hole b (2400) is provided on the top of the connecting horizontal plate (240), the connecting horizontal plate (240) passes through the rectangular hole a (230), and an L-shaped plug (25) is inserted into the rectangular hole b (2400).

6. The vacuum electron tube polishing device according to claim 5, characterized in that: The outer wall of the connecting horizontal plate (240) is provided with a frame-shaped limiting block (2401), and the side of the frame-shaped limiting block (2401) away from the arc-shaped clamping plate (24) abuts against the side surface of the connecting vertical plate (23).

7. The vacuum electron tube polishing device according to claim 1, characterized in that: Two first positioning rods (26) are provided between the front and rear sides of the inner wall of the U-shaped plate (20) and near the top, and are symmetrically arranged on both sides. The moving block (22) is slidably connected to the outer sides of the first positioning rods (26).

8. The vacuum electron tube polishing device according to claim 1, characterized in that: An auxiliary limiting assembly (5) is provided on the U-shaped plate (20), and the auxiliary limiting assembly (5) comprises a frame-shaped fixed plate (50) fixedly connected to the middle of the top of the U-shaped plate (20), an adjusting horizontal plate (51) is movably connected inside the frame-shaped fixed plate (50), and a positioning vertical plate (52) is provided at the left end of the adjusting horizontal plate (51).

9. The vacuum electron tube fine grinding device according to claim 8, characterized in that: The top of the frame-shaped fixing plate (50) is threadedly connected to a clamping bolt (53), and the threaded end of the clamping bolt (53) abuts against the top of the adjusting horizontal plate (51).

10. The vacuum electron tube polishing device according to claim 1, characterized in that: The left sides of both front and rear sides of the frame (42) are provided with side panels (45), and the right sides of both side panels (45) are provided with second positioning rods (46), and the right ends of the second positioning rods (46) pass through the left side of the fixed vertical plate (40).

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