Workpiece tooling fixture for an external cylindrical grinder

Abstract

The application relates to the technical field of clamps, in particular to a workpiece tool clamp for a cylindrical grinding machine, which comprises a base, the top outer wall of the base is fixedly connected with a fixing seat and a sliding seat, the mutually close side outer walls of the fixing seat and the sliding seat are fixedly connected with connecting seats, cavities are arranged in the connecting seats, abutting assemblies and moving assemblies are arranged in the cavities, the abutting assemblies comprise first bidirectional motors, driving threaded rods, first moving barrels and jacks, the moving assemblies comprise driving gears, driven gears, driven threaded rods, second moving barrels and first bearings, the first bidirectional motors drive the first moving barrels and the second moving barrels to move in opposite directions, the clamping state of the same end of a workpiece can be switched, the workpiece needs to be clamped twice during polishing, the problem of low machining efficiency is solved, the clamp state can be switched, and clamping and abutting can be simultaneously realized.

Description

Technical Field

[0001] This invention relates to the field of fixture technology, specifically to a workpiece tooling fixture for an external cylindrical grinding machine. Background Technology

[0002] External cylindrical grinding machines are used to process the outer surfaces of workpieces formed by the generatrices of cylindrical, conical, or other shapes, as well as the end faces of shaft shoulders. They are the most widely used type of grinding machine and can process various cylindrical and conical outer surfaces. They are generally composed of a cast iron bed as the base, a worktable, a headstock and tailstock that support and drive the workpiece rotation, a grinding wheel head that mounts the grinding wheels, a transverse feed mechanism that controls the dimensions of the workpiece being ground, and electrical and hydraulic devices that control the movement of the machine tool's moving parts. When grinding a workpiece, it is first necessary to fix the workpiece in a fixture.

[0003] Current external cylindrical tooling fixtures typically use a three-jaw chuck to hold one end of the workpiece during clamping. This clamping method requires the workpiece to avoid contact with the grinding wheel during operation. After grinding one end, the workpiece is flipped over to grind the other end, preventing the entire workpiece from being ground in one go. Each workpiece requires at least two clamping operations, reducing machining efficiency.

[0004] Therefore, a workpiece fixture for cylindrical grinding machines is needed to solve the problem of low processing efficiency caused by having to clamp the workpiece twice. The fixture should be able to switch states to achieve both clamping and pressing. Summary of the Invention

[0005] The purpose of this invention is to provide a workpiece fixture for a cylindrical grinding machine to solve the problem mentioned in the background art that grinding workpieces requires clamping twice and has low processing efficiency. This invention provides a workpiece fixture for a cylindrical grinding machine that can switch the fixture state and simultaneously achieve clamping and pressing.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a workpiece fixture for an external cylindrical grinding machine, comprising a base, a fixed seat and a sliding seat fixedly connected to the top outer wall of the base, and connecting seats fixedly connected to the side outer walls of the fixed seat and the sliding seat that are close to each other. The connecting seat has an internal cavity, and an abutment component and a moving component are disposed inside the cavity. The abutment component includes a first bidirectional motor, a driving threaded rod, a first moving cylinder, and a push rod. The moving component includes a driving gear, a driven gear, a driven threaded rod, a second moving cylinder, and a first bearing. A connecting plate is fixedly connected to the outer wall of the second moving cylinder on the side away from the first bearing. A circular groove is formed on the outer wall of the connecting plate on the side away from the second moving cylinder. A circular slider is slidably connected to the inner wall of the circular groove. A rotating disk is fixedly connected to the outer wall of the circular slider. The rotating disk has multiple arc-shaped openings with interconnected inner walls on both sides. A sliding shaft is movably connected to the inner wall of the arc-shaped opening. A sliding seat is fixedly connected to the outer wall of the sliding shaft. A pressing rod is fixedly connected to the outer wall of the sliding seat on the side away from the sliding shaft.

[0007] Preferably, the outer wall of the first bidirectional motor is fixedly connected to the inner wall of the cavity side, one end of the outer wall of the active threaded rod is fixedly connected to the output shaft of the first bidirectional motor, the outer wall of the active threaded rod is threadedly connected to the inner wall of the first moving cylinder, and the outer wall of the first moving cylinder on the side away from the first bidirectional motor is fixedly connected to one end of the outer wall of the top rod.

[0008] Preferably, the inner wall of the driving gear is fixedly connected to the outer wall of the driving threaded rod, the outer wall of the first bearing is fixedly connected to the inner side wall of the cavity, the inner bushing of the first bearing is fixedly connected to the outer wall of the driven threaded rod, the outer wall of the driven threaded rod is fixedly connected to the inner wall of the driven gear, the outer wall of the driven gear is meshed with the outer wall of the driving gear, the outer wall of the driven threaded rod is threadedly connected to the inner wall of the second moving cylinder, and the second moving cylinder is away from the first bearing.

[0009] Preferably, a connecting frame is fixedly connected to the outer wall of the second movable cylinder near the inner wall of the cavity, a second bidirectional motor is fixedly connected to the top inner wall of the connecting frame, a worm gear is fixedly connected to the output shaft of the second bidirectional motor, a second bearing is fixedly connected to the bottom inner wall of the connecting frame, and the inner bushing of the second bearing is fixedly connected to the outer wall of the worm gear.

[0010] Preferably, a worm gear is fixedly connected to the outer wall of the rotating disk, and the outer wall of the worm gear meshes with the outer wall of the worm.

[0011] Preferably, a limiting opening is provided on the outer wall of the connecting frame away from the driven gear, and limiting grooves are provided on the inner walls of both sides of the limiting opening. The inner wall of the limiting groove is slidably connected to the outer wall of the sliding seat, and the outer wall of the pressing rod is movably connected to the outer wall of the connecting frame.

[0012] Preferably, rectangular sliders are fixedly connected to the outer walls of the front and rear sides of the connecting frame, and rectangular grooves are provided on the inner walls of the front and rear sides of the cavity. The inner wall of the rectangular grooves is slidably connected to the outer wall of the rectangular sliders.

[0013] Preferably, rubber pads are fixedly connected to the outer walls of the adjacent sides of the extrusion rods, and the rubber pads are arc-shaped.

[0014] Preferably, a suction cup is fixedly connected to the outer wall of the top rod on the side away from the first moving cylinder.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the first bidirectional motor in the moving assembly drives the active threaded rod and the driven threaded rod to rotate. The rotation directions of the active threaded rod and the driven threaded rod are opposite, so that the movement directions of the first moving cylinder and the second moving cylinder are opposite. When one end needs to be ground, the first moving cylinder drives the push rod to abut against the workpiece, and the second moving cylinder drives the extrusion rod away from the workpiece. When the grinding of one end is completed and the other end needs to be ground, the first bidirectional motor starts to move in the opposite direction, the push rod moves away from the workpiece, and the second moving cylinder moves towards the workpiece. The second bidirectional motor is started, so that the arc-shaped opening rotates and drives the sliding shaft rods to move closer to each other, that is, the extrusion rods move closer to each other to stably clamp the workpiece. This solves the problem that the workpiece needs to be clamped twice and the processing efficiency is low. The clamping state can be switched to achieve clamping and pressing at the same time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall left front direction structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the connector structure of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal structure of the cavity in this invention;

[0019] Figure 4 This is a schematic diagram of the arc-shaped opening structure of the present invention;

[0020] Figure 5 This is a top view of the cavity interior of the present invention;

[0021] Figure 6 This is a schematic diagram of the sliding shaft structure of the present invention;

[0022] Figure 7 This is a schematic diagram of the circular groove structure of the present invention;

[0023] Figure 8 This is a schematic diagram of the suction cup structure of the present invention;

[0024] Figure 9 This is a schematic diagram of the roller structure of the present invention.

[0025] In the diagram: 1. Base; 2. Fixed seat; 3. Moving seat; 4. Cavity; 5. First bidirectional motor; 6. Driving threaded rod; 7. First moving cylinder; 8. Driving gear; 9. Driven gear; 10. Driven threaded rod; 11. Second moving cylinder; 12. Push rod; 13. Suction cup; 14. Connecting plate; 15. Circular groove; 16. Circular slider; 17. Connecting frame; 18. Second bidirectional motor; 19. Worm gear; 20. Worm wheel; 21. Rotary disk; 22. Arc-shaped opening; 23. Sliding shaft; 24. Limiting opening; 25. Limiting groove; 26. Sliding seat; 27. Extrusion rod; 28. Rubber pad; 29. ​​First bearing; 30. Rectangular groove; 31. Rectangular slider; 32. Connecting seat; 33. Support; 34. Circular channel; 35. Return spring; 36. Sliding telescopic rod; 37. Connecting plate; 38. Roller; 39. Second bearing. Implementation

[0026] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "a," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] For purposes of simplicity and illustration, the principles of the embodiments are described primarily by way of example. In the following description, numerous specific details are set forth to provide a thorough understanding of the embodiments. However, it will be apparent to those skilled in the art that these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and structures have not been described in detail to avoid unnecessarily obscuring these embodiments. Furthermore, all embodiments can be used in combination with each other. Example

[0030] Please see Figures 1 to 9 This invention provides a technical solution: a workpiece fixture for an external cylindrical grinding machine, comprising a base 1, a fixed seat 2 and a movable seat 3 fixedly connected to the top outer wall of the base 1, and connecting seats 32 fixedly connected to the adjacent side outer walls of the fixed seat 2 and the movable seat 3, wherein a cavity 4 is formed inside the connecting seat 32, and an abutment component and a moving component are disposed inside the cavity 4. The abutment component includes a first bidirectional motor 5, a driving threaded rod 6, a first moving cylinder 7 and a push rod 12, and the moving component includes a driving gear 8, a driven gear 9, a driven threaded rod 10, a second moving cylinder 11 and a first bearing 29. A connecting plate 14 is fixedly connected to the outer wall of the second moving cylinder 11 on the side away from the first bearing 29. A circular groove 15 is opened on the outer wall of the connecting plate 14 on the side away from the second moving cylinder 11. A circular slider 16 is slidably connected to the inner wall of the circular groove 15. A rotating disk 21 is fixedly connected to the outer wall of the circular slider 16. A plurality of arc-shaped openings 22 with their inner walls connected on both sides are opened on the rotating disk 21. A sliding shaft 23 is movably connected to the inner wall of the arc-shaped openings 22. A sliding seat 26 is fixedly connected to the outer wall of the sliding shaft 23. A pressing rod 27 is fixedly connected to the outer wall of the sliding seat 26 on the side away from the sliding shaft 23.

[0031] The first bidirectional motor 5 in the moving assembly drives the driving threaded rod 6 and the driven threaded rod 10 to rotate. The driving threaded rod 6 and the driven threaded rod 10 rotate in opposite directions, thus the first moving cylinder 7 and the second moving cylinder 11 move in opposite directions. The first moving cylinder 7 and the second moving cylinder 11 move inside the cavity 4, allowing for switching of the clamping state at the same end of the workpiece. When one end of the workpiece needs to be ground, the first moving cylinder 7 at that end moves forward, driving the push rod 12 forward, and the second moving cylinder 11 moves backward, without clamping the outer wall of the workpiece to avoid obstructing the grinding. The working state at the other end is the opposite: the first moving cylinder 7 moves away from the workpiece, and the multiple extrusion rods 27 move closer to each other, pressing against the workpiece. The outer wall clamping method stabilizes the workpiece by abutting one end and clamping the other end. When grinding one end of the workpiece, the first bidirectional motor 5 rotates in the opposite direction, the second moving cylinder 11 moves away from the workpiece, and the first moving cylinder 7 moves closer to the workpiece, changing from a clamping state to abutting state. Similarly, the end that was initially abutting changes from abutting state to clamping state. This invention uses the first bidirectional motor 5 to drive the first moving cylinder 7 and the second moving cylinder 11 to move in opposite directions, which can switch the clamping state of the same end of the workpiece. This solves the problem of low processing efficiency caused by having to clamp the workpiece twice when grinding it. It can switch the fixture state and achieve both clamping and abutting at the same time. Example

[0032] See attached document Figures 1 to 9Based on Embodiment 1, to achieve different clamping states, the outer wall of the first bidirectional motor 5 is fixedly connected to the inner wall of the side of the cavity 4; one end of the outer wall of the driving threaded rod 6 is fixedly connected to the output shaft of the first bidirectional motor 5; the outer wall of the driving threaded rod 6 is threadedly connected to the inner wall of the first moving cylinder 7; the outer wall of the first moving cylinder 7 away from the first bidirectional motor 5 is fixedly connected to the outer wall of one end of the top rod 12; the inner wall of the driving gear 8 is fixedly connected to the outer wall of the driving threaded rod 6; the outer wall of the first bearing 29 is fixedly connected to the inner wall of the side of the cavity 4; the inner bushing of the first bearing 29 is fixedly connected to the outer wall of the driven threaded rod 10; the outer wall of the driven threaded rod 10 is fixedly connected to the inner wall of the driven gear 9; the outer wall of the driven gear 9 meshes with the outer wall of the driving gear 8; the outer wall of the driven threaded rod 10 is threadedly connected to the inner wall of the second moving cylinder 11; the second moving cylinder 11 is away from the first bearing 29; the second moving cylinder 11 is close to the cavity 4. A connecting frame 17 is fixedly connected to one side of the outer wall of the wall. A second bidirectional motor 18 is fixedly connected to the top inner wall of the connecting frame 17. A worm gear 19 is fixedly connected to the output shaft of the second bidirectional motor 18. A second bearing 39 is fixedly connected to the bottom inner wall of the connecting frame 17. The inner bushing of the second bearing 39 is fixedly connected to the outer wall of the worm gear 19. A worm wheel 20 is fixedly connected to the outer wall of the rotating disk 21. The outer wall of the worm wheel 20 meshes with the outer wall of the worm gear 19. A limiting opening 24 is opened on the outer wall of the connecting frame 17 away from the driven gear 9. Limiting grooves 25 are opened on the inner walls of both sides of the limiting opening 24. The inner wall of the limiting groove 25 is slidably connected to the outer wall of the sliding seat 26. The outer wall of the extrusion rod 27 is movably connected to the outer wall of the connecting frame 17. A rectangular slider 31 is fixedly connected to the front and rear outer walls of the connecting frame 17. A rectangular groove 30 is opened on the front and rear inner walls of the cavity 4. The inner wall of the rectangular groove 30 is slidably connected to the outer wall of the rectangular slider 31.

[0033] When grinding is required on one end of the workpiece, the first bidirectional motor 5 drives the drive threaded rod 6 to rotate, which in turn drives the drive gear 8 to rotate. The first moving cylinder 7 moves closer to the workpiece, and the push rod 12 abuts against the workpiece. At this time, the drive gear 8 drives the driven gear 9 to rotate, with the driven gear 9 rotating in the opposite direction to the drive gear 8. The second moving cylinder 11 moves away from the workpiece, and the pressing rod 27 does not clamp the workpiece. The pressing rod 27 moves away from the workpiece to avoid obstructing the grinding. The other end is in a clamped state. The workpiece is stably clamped by the method of one end abutting and the other end clamping. When grinding is required on the other end, the first bidirectional motor 5 starts... Moving in the opposite direction, the top rod 12 moves away from the workpiece, and the second moving cylinder 11, carrying the connecting frame 17, slides on the inner wall of the rectangular slide groove 30, moving towards the workpiece. The second bidirectional motor 18 is started, and the rotation of the second bidirectional motor 18 drives the worm gear 19 to rotate. The rotation of the worm gear 19 drives the worm wheel 20 to rotate, and the rotation of the worm wheel drives the arc-shaped opening 22 to rotate. The rotation of the arc-shaped opening 22 drives the sliding shafts 23 to move closer to each other, that is, the pressing rods 27 move closer to each other to stably clamp the workpiece. The other end correspondingly changes from the clamping state to the abutting state, and grinding begins. It can clamp workpieces of different specifications to solve the problem of low processing efficiency caused by having to clamp the workpiece twice. The clamping state can be switched to achieve clamping and abutting at the same time. Example

[0034] See attached document Figures 1 to 9 Based on Embodiment 2, in order to achieve stable clamping, rubber pads 28 are fixedly connected to the outer walls of the sides of the extrusion rods 27 that are close to each other. The rubber pads 28 are arc-shaped, and suction cups 13 are fixedly connected to the outer wall of the top rod 12 that is away from the first moving cylinder 7.

[0035] The suction cup 13 can effectively hold the workpiece, avoiding instability due to insufficient force during grinding. The rubber pad 28 can effectively increase friction, making the clamping more stable. This further solves the problem of low processing efficiency due to the need to clamp the workpiece twice. The clamping state can be switched to achieve both clamping and pressing. Example

[0036] See attached document Figures 1 to 9 Based on Embodiment 3, in order to achieve stability of the workpiece during the grinding process and avoid tilting at both ends of the workpiece, the top outer wall of the base 1 is fixedly connected to the support 33. The inner walls of the three sides of the support 33 are provided with circular channels 34. The inner walls of the circular channels 34 are fixedly connected to the return spring 35 and the sliding telescopic rod 36. The sliding telescopic rod 36 is located inside the return spring 35. The sliding telescopic rod 36 and the end of the return spring 35 away from the inner wall of the circular channel 34 are fixedly connected to the connecting plate 37. The side of the connecting plate 37 away from the return spring 35 is fixedly connected to the roller 38.

[0037] By setting the return spring 35 and roller 38, support force can be provided in the middle of the workpiece, improving the balance of the workpiece and preventing the two ends of the workpiece from tilting. The roller 38 supports the workpiece without affecting its rotation. The position of the roller 38 is controlled by the return spring 35. When the diameter of the workpiece is large, the return spring 35 is compressed. When the workpiece is small, the return spring 35 immediately returns to its original position, and the rollers 38 move closer to each other to support the workpiece. The arrangement of the return spring 35 and roller 38 can support workpieces of different specifications, further solving the problem of low processing efficiency caused by having to clamp the workpiece twice when grinding. The fixture state can be switched to achieve clamping and pressing at the same time. Example

[0038] A method for using a workpiece fixture for an external cylindrical grinding machine includes the following steps:

[0039] Step 1: When grinding one end of the workpiece, the first bidirectional motor 5 drives the drive threaded rod 6 to rotate, which in turn drives the drive gear 8. The first moving cylinder 7 moves closer to the workpiece, and the push rod 12 abuts against the workpiece. At this time, the drive gear 8 drives the driven gear 9 to rotate, with the driven gear 9 rotating in the opposite direction to the drive gear 8. The second moving cylinder 11 moves away from the workpiece, and the pressing rod 27 does not clamp the workpiece. The pressing rod 27 moves away from the workpiece to avoid obstructing the grinding process. The other end is in a clamped state.

[0040] Step 2: When the other end needs to be polished, the first bidirectional motor 5 starts to move in the opposite direction, the push rod 12 moves away from the workpiece, the second moving cylinder 11 moves towards the workpiece, the second bidirectional motor 18 is started, the second bidirectional motor 18 rotates and drives the worm gear 19 to rotate, the worm gear 19 rotates and drives the worm wheel 20 to rotate, the worm wheel rotates and drives the arc-shaped opening 22 to rotate, the arc-shaped opening 22 rotates and drives the sliding shafts 23 to move closer to each other, that is, the pressing rods 27 move closer to each other to stabilize the workpiece, and the other end changes from the clamping state to the abutting state, and polishing begins;

[0041] Step 3: The suction cup 13 can effectively hold the workpiece, preventing the workpiece from being unstable due to insufficient force during grinding. The rubber pad 28 can effectively increase friction and make the clamping more stable.

[0042] Step 4: By setting up the return spring 35 and roller 38, support force can be provided in the middle of the workpiece, improving the balance of the workpiece and preventing the two ends of the workpiece from tilting. The roller 38 supports the workpiece without affecting its rotation. The position of the roller 38 is controlled by the return spring 35. When the diameter of the workpiece is large, the return spring 35 is compressed. When the workpiece is small, the return spring 35 immediately returns to its original position, and the rollers 38 move closer to each other to support the workpiece.

[0043] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. A workpiece fixture for an external cylindrical grinding machine, comprising a base (1), characterized in that: A fixed seat (2) and a movable seat (3) are fixedly connected to the top outer wall of the base (1). A connecting seat (32) is fixedly connected to the outer side walls of the fixed seat (2) and the movable seat (3) that are close to each other. A cavity (4) is opened inside the connecting seat (32). An abutting component and a moving component are arranged inside the cavity (4). The abutting component includes a first bidirectional motor (5), a driving threaded rod (6), a first moving cylinder (7), and a push rod (12). The moving component includes a driving gear (8), a driven gear (9), a driven threaded rod (10), a second moving cylinder (11), and a first bearing (29). The second moving cylinder (11) is away from the first bearing (29). A connecting plate (14) is fixedly connected to one side of the outer wall of the second moving cylinder (11). A circular groove (15) is opened on the outer wall of the connecting plate (14) away from the second moving cylinder (11). A circular slider (16) is slidably connected to the inner wall of the circular groove (15). A rotating disk (21) is fixedly connected to the outer wall of the circular slider (16). A plurality of arc-shaped openings (22) with their inner walls connected on both sides are opened on the rotating disk (21). A sliding shaft (23) is movably connected to the inner wall of the arc-shaped opening (22). A sliding seat (26) is fixedly connected to the outer wall of the sliding shaft (23). A pressing rod (27) is fixedly connected to the outer wall of the sliding seat (26) away from the sliding shaft (23).

2. The workpiece fixture for an external cylindrical grinding machine according to claim 1, characterized in that: The outer wall of the first bidirectional motor (5) is fixedly connected to the inner wall of the side of the cavity (4), the outer wall of one end of the active threaded rod (6) is fixedly connected to the output shaft of the first bidirectional motor (5), the outer wall of the active threaded rod (6) is threadedly connected to the inner wall of the first moving cylinder (7), and the outer wall of the side of the first moving cylinder (7) away from the first bidirectional motor (5) is fixedly connected to the outer wall of one end of the top rod (12).

3. A workpiece fixture for an external cylindrical grinding machine according to claim 1, characterized in that: The inner wall of the driving gear (8) is fixedly connected to the outer wall of the driving threaded rod (6), the outer wall of the first bearing (29) is fixedly connected to the inner side wall of the cavity (4), the inner bushing of the first bearing (29) is fixedly connected to the outer wall of the driven threaded rod (10), the outer wall of the driven threaded rod (10) is fixedly connected to the inner wall of the driven gear (9), the outer wall of the driven gear (9) is meshed with the outer wall of the driving gear (8), the outer wall of the driven threaded rod (10) is threadedly connected to the inner wall of the second moving cylinder (11), and the second moving cylinder (11) is away from the first bearing (29).

4. A workpiece fixture for an external cylindrical grinding machine according to claim 3, characterized in that: A connecting frame (17) is fixedly connected to the outer wall of the second movable cylinder (11) near the inner wall of the cavity (4). A second bidirectional motor (18) is fixedly connected to the top inner wall of the connecting frame (17). A worm gear (19) is fixedly connected to the output shaft of the second bidirectional motor (18). A second bearing (39) is fixedly connected to the bottom inner wall of the connecting frame (17). The inner bushing of the second bearing (39) is fixedly connected to the outer wall of the worm gear (19).

5. A workpiece fixture for an external cylindrical grinding machine according to claim 1, characterized in that: The outer wall of the rotating disk (21) is fixedly connected to a worm wheel (20), and the outer wall of the worm wheel (20) meshes with the outer wall of the worm (19).

6. A workpiece fixture for an external cylindrical grinding machine according to claim 4, characterized in that: The connecting frame (17) has a limiting opening (24) on the outer wall away from the driven gear (9), and limiting grooves (25) are provided on the inner walls of both sides of the limiting opening (24). The inner wall of the limiting groove (25) is slidably connected to the outer wall of the sliding seat (26), and the outer wall of the pressing rod (27) is movably connected to the outer wall of the connecting frame (17).

7. A workpiece fixture for an external cylindrical grinding machine according to claim 4, characterized in that: The front and rear outer walls of the connecting frame (17) are fixedly connected with rectangular sliders (31), and the front and rear inner walls of the cavity (4) are provided with rectangular grooves (30). The inner wall of the rectangular grooves (30) is slidably connected to the outer wall of the rectangular sliders (31).

8. A workpiece fixture for an external cylindrical grinding machine according to claim 1, characterized in that: The outer side walls of the extrusion rods (27) that are close to each other are fixedly connected with rubber pads (28), which are arc-shaped.

9. A workpiece fixture for an external cylindrical grinding machine according to claim 2, characterized in that: A suction cup (13) is fixedly connected to the outer wall of the top rod (12) away from the first moving cylinder (7).

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