Pipe bending device

Abstract

The utility model relates to the technical field of pipe bending, in particular to a pipe bending device which comprises a workbench, a bending device and a bending device. The supporting assembly is horizontally arranged above the workbench and used for supporting the pipe; the feeding device is arranged in the cavity, fixedly connected with the supporting assembly and used for pushing the pipe to move horizontally through the supporting assembly; the limiting assembly is attached to the pipe and used for limiting the pipe during bending; the fixing device is arranged at the end, away from the supporting assembly, of the pipe and used for fixing the pipe. By operating the fixing device, the fixing device can fix pipes with different outer diameters, the pipe fixing effect is improved, a corresponding fixing block does not need to be replaced any more, the pipes with different outer diameters are fixed through one fixing block, and use is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe bending, in particular to a pipe bending device. Background Art

[0002] Pipes are materials used to make pipe fittings and are often used as exhaust pipes in the automotive field. Depending on the purpose of the pipe, the pipe needs to be processed differently. Among them, pipe bending is the process of bending the pipe according to specific needs and requirements. A pipe bending device is required in the process of pipe bending.

[0003] However, when the existing pipe bending device is in use, a fixing block is used to fix the end of the pipe that needs to be bent, and the fixing block is rotated to make the pipe bend under the restriction of the limiting wheel to achieve bending. In order to make the pipe more stable when bending, the contact surface between the fixing block and the pipe is mostly an arc surface. However, when bending a pipe with a smaller outer diameter, there is only one contact point between the fixing block and the pipe, which easily causes the pipe to move. This requires replacing the fixing block corresponding to the pipe, and this process is relatively time-consuming. It is inconvenient that one fixing block cannot be used to fix pipes of different outer diameters. Utility Model Content

[0004] The utility model aims to solve the inconvenience problem caused by the existing pipe bending device that one fixing block cannot be used to fix pipes with different outer diameters.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A pipe bending device, comprising:

[0007] A workbench, with a cavity formed inside;

[0008] A support assembly, horizontally arranged above the workbench, for supporting the pipe;

[0009] A feeding device, disposed inside the cavity and fixedly connected to the support assembly, for pushing the pipe to move horizontally through the support assembly;

[0010] A limiting component, which fits the pipe and is used to limit the position of the pipe when it is bent;

[0011] A fixing device, disposed at one end of the pipe away from the supporting assembly, for fixing the pipe;

[0012] The bending assembly is arranged in the cavity and fixedly connected to the fixing device, and is used to drive the fixing device to rotate to bend the pipe.

[0013] Preferably, the fixing device comprises:

[0014] A fixed housing is arranged between the workbench and the pipe;

[0015] An electric push rod is arranged inside the fixed housing;

[0016] Two groups of rotating rods, one end of each group of rotating rods is rotatably connected to the output end of the electric push rod;

[0017] Two groups of moving parts, one end of each group of moving parts is rotatably connected to the other end of the rotating rod, and the other end of the moving parts is slidably connected to the fixed shell; the surface of the moving parts is provided with a first cylindrical pin;

[0018] Two groups of rotating members, each group of rotating members has a first through groove and a second through groove on its surface, and the first through groove is located below the second through groove; the rotating member is slidably connected to the first cylindrical pin through the first through groove; the bottom end of the rotating member is rotatably connected to the fixed housing;

[0019] Two groups of fixing members, each group of fixing members is provided with a second cylindrical pin on its surface, the second cylindrical pin is located in the second through-groove, and is slidably connected with the rotating member through the second through-groove;

[0020] Two groups of first sliding blocks, each group of first sliding blocks is fixedly connected to the lower side of the fixing member, and the first sliding blocks are slidably connected to the fixing shell via a first sliding groove provided on the upper end surface of the fixing shell.

[0021] Preferably, a notch is provided on a side of the fixing member close to the pipe.

[0022] Preferably, the bending assembly comprises:

[0023] A rotating plate, one end of which is fixedly connected to the bottom end of the fixed housing;

[0024] A bevel gear set, consisting of a first bevel gear and a second bevel gear, the edge of the first bevel gear is meshed and connected with the edge of the second bevel gear, and the axis of the first bevel gear is fixedly connected with the other end of the rotating plate;

[0025] A first motor, wherein an output end of the first motor is fixedly connected to the axis of the second bevel gear.

[0026] Preferably, the axis of the first bevel gear and the central axis of the tube are in the same vertical plane.

[0027] Preferably, the support assembly comprises:

[0028] A support plate, arranged at one end of the pipe;

[0029] The pipe fixing structure penetrates the support plate and is rotatably connected to the support plate; the pipe fixing structure is tightly fitted to the pipe;

[0030] A second motor, wherein an output end of the second motor is fixedly connected to one end of the pipe fixing structure.

[0031] Preferably, the feeding device comprises:

[0032] A movable plate, the top end of which is fixedly connected to the bottom end of the supporting plate;

[0033] A threaded rod, passing through a corresponding position of the movable plate and being threadedly connected to the movable plate;

[0034] A third motor, wherein an output end of the third motor is fixedly connected to one end of the threaded rod.

[0035] Preferably, the limiting assembly consists of a support frame and a limiting wheel, and both ends of the limiting wheel are rotatably connected to the support frame.

[0036] Preferably, it also includes: an adjusting device; the adjusting device is fixedly connected to the bottom end of the support frame and is used to adjust the position of the limiting assembly.

[0037] Preferably, the adjusting device comprises:

[0038] A vertical rod, the top end of which is fixedly connected to the support frame; a third cylindrical pin is provided on the surface of the vertical rod;

[0039] A second sliding block is disposed at the bottom end of the vertical rod and fixedly connected to the vertical rod, and the second sliding block is slidably connected to the workbench through a second sliding groove provided on the upper surface of the workbench;

[0040] A grooved roller, wherein the grooved roller is provided with inclined annular grooves connected end to end on its surface, and is slidably connected to the second sliding block via the inclined annular grooves;

[0041] A fourth motor, wherein an output end of the fourth motor is fixedly connected to one end of the grooved roller.

[0042] The beneficial effect proposed by the utility model is that by operating the fixing device, the fixing device can fix pipes with different outer diameters, thereby improving the fixing effect of the pipes. It is no longer necessary to replace the corresponding fixing blocks, and one fixing block can be used to fix pipes with different outer diameters, which is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the structure of the utility model;

[0044] Figure 2 for Figure 1 Schematic diagram of the cross-section plane at the BB line;

[0045] Figure 3 for Figure 1 The right side plan view of the internal connection structure;

[0046] Figure 4 for Figure 1 The left side plan view of the internal connection structure;

[0047] Figure 5 for Figure 3 Schematic diagram of the connection structure at A in the middle.

[0048] In the figure: 1. workbench, 2. pipe, 3. limit assembly, 4. fixed shell, 5. electric push rod, 6. rotating rod, 7. moving part, 8. rotating part, 9. fixed part, 10. first slider, 11. bevel gear set, 12. first motor, 13. rotating plate, 14. pipe fixing structure, 15. second motor, 16. support plate, 17. moving plate, 18. threaded rod, 19. third motor, 20. vertical rod, 21. second slider, 22. grooved roller, 23. fourth motor. DETAILED DESCRIPTION

[0049] The utility model is further described below in conjunction with the accompanying drawings: Example

[0050] See also Figure 1-5 In this embodiment: a pipe bending device includes: a workbench 1, a supporting assembly, a feeding device, a limiting assembly 3, a fixing device and a bending assembly.

[0051] In this embodiment, a cavity is formed inside the workbench 1; a support assembly is horizontally arranged above the workbench 1 for supporting the pipe 2; a feeding device is arranged inside the cavity and fixedly connected to the support assembly for pushing the pipe 2 to move horizontally through the support assembly.

[0052] In this embodiment, the feeding device can push the supporting assembly to move slowly horizontally, and the supporting assembly drives the pipe 2 to move at the same time.

[0053] The limiting component 3 is fitted with the pipe 2 and is used to limit the pipe 2 during bending; the fixing device is arranged at the end of the pipe 2 away from the supporting component and is used to fix the pipe 2; the bending component is arranged in the cavity and is fixedly connected to the fixing device and is used to drive the fixing device to rotate and bend the pipe 2.

[0054] In this embodiment, the bending assembly can make the fixing device rotate in a circle, and the fixing device simultaneously drives one end of the pipe 2 to move. At this time, the pipe 2 will rotate under the restriction of the limiting assembly 3, so that the pipe 2 bends, thereby realizing the bending of the pipe 2.

[0055] like Figure 3 As shown, the fixing device includes: a fixed housing 4, an electric push rod 5, two groups of rotating rods 6, two groups of moving parts 7, two groups of rotating parts 8, two groups of fixing parts 9 and two groups of first sliding blocks 10.

[0056] In this embodiment, the fixed housing 4 is disposed between the workbench 1 and the pipe 2 ; the electric push rod 5 is disposed inside the fixed housing 4 .

[0057] In this embodiment, the model of the electric push rod 5 is selected according to actual needs and only needs to meet the working conditions.

[0058] One end of each set of rotating rods 6 is rotationally connected to the output end of the electric push rod 5 ; one end of each set of moving parts 7 is rotationally connected to the other end of the rotating rod 6 , and the other end of the moving parts 7 is slidingly connected to the fixed housing 4 .

[0059] In this embodiment, by adjusting the output end of the electric push rod 5 to extend or retract, the two sets of rotating rods 6 can be rotated and the moving member 7 can be pushed to move outward or inward at the same time. The moving member 7 will move horizontally under the restriction of the fixed shell 4.

[0060] A first cylindrical pin is provided on the surface of the movable member 7; a first through groove and a second through groove are provided on the surface of each group of rotating members 8, and the first through groove is located below the second through groove; the rotating member 8 is slidingly connected to the first cylindrical pin through the first through groove; the bottom end of the rotating member 8 is rotatably connected to the fixed shell 4.

[0061] In this embodiment, when the moving member 7 moves horizontally, it will drive the first cylindrical pin to move synchronously, and the rotating member 8 will rotate along the connection with the fixed housing 4 through the sliding between the first cylindrical pin and the first through groove.

[0062] A second cylindrical pin is disposed on the surface of each set of fixing members 9 . The second cylindrical pin is located in the second through-groove and is slidably connected to the rotating member 8 via the second through-groove.

[0063] In this embodiment, when the rotating member 8 rotates, the sliding between the second through slot and the second cylindrical pin causes the two sets of fixing members 9 to move horizontally toward the middle or toward the outside at the same time.

[0064] Each group of first sliding blocks 10 is fixedly connected to the lower part of the fixing member 9 , and the first sliding blocks 10 are slidably connected to the fixed shell 4 via a first sliding groove provided on the upper end surface of the fixed shell 4 .

[0065] In this embodiment, the first sliding block 10 can limit the fixing member 9 to move only horizontally.

[0066] A notch is provided on one side of the fixing member 9 close to the pipe 2 . The notch is a “V”-shaped notch, which can increase the contact points between the fixing member 9 and the pipe 2 .

[0067] When it is necessary to fix the pipe 2 with a smaller outer diameter, adjust the electric push rod 5 so that the output end of the electric push rod 5 shrinks; at this time, the two groups of rotating rods 6 pull the two groups of moving parts 7 to move toward the middle at the same time while rotating downward; the moving part 7 will drive the first cylindrical pin to move; and through the sliding between the first cylindrical pin and the first through-groove, the rotating part 8 rotates toward the middle along the connection with the fixed shell 4; at this time, the rotating part 8 will slide between the second through-groove and the second cylindrical pin, so that the two groups of fixing parts 9 move horizontally toward the middle at the same time; the fixing part 9 will fix the pipe 2, and because the fixing part 9 uses a V-shaped notch instead of an arc-shaped contact surface, the fixing part 9 has at least two contact points with the pipe 2, thereby improving the fixing ability of the pipe 2; there is no need to replace the corresponding fixing block, and one fixing block can be used to fix pipes of different outer diameters, which is easy to use.

[0068] like Figure 2 As shown, the bending assembly includes: a rotating plate 13, a bevel gear set 11 and a first motor 12.

[0069] Specifically, one end of the rotating plate 13 is fixedly connected to the bottom end of the fixed housing 4 .

[0070] In this embodiment, the rotating plate 13 can drive the fixed housing 4 to rotate, and an arc groove is provided at the moving position of the workbench 1 corresponding to the fixed housing 4, which will not hinder the rotation of the fixed housing 4.

[0071] The bevel gear set 11 consists of a first bevel gear and a second bevel gear. The edge of the first bevel gear is meshed with the edge of the second bevel gear. The axis of the first bevel gear is fixedly connected to the other end of the rotating plate 13. The output end of the first motor 12 is fixedly connected to the axis of the second bevel gear.

[0072] In this embodiment, the model of the first motor 12 is selected according to actual needs and meets the working conditions. The rotation ratio between the first bevel gear and the second bevel gear is 1:20. After the second bevel gear rotates twenty times, the first bevel gear rotates one circle.

[0073] The axis of the first bevel gear and the central axis of the pipe 2 are in the same vertical plane.

[0074] When bending is required, the first motor 12 is started, and the output end of the first motor 12 drives the second bevel gear to rotate; the second bevel gear drives the first bevel gear to rotate slowly; the first bevel gear also drives the rotating plate 13 to rotate, and the rotating plate 13 causes the entire fixing device to move in a circle, thereby driving one end of the pipe 2 to bend, thereby achieving bending.

[0075] like Figure 2 As shown, the support assembly includes: a support plate 16 , a pipe fixing structure 14 and a second motor 15 .

[0076] Among them, the support plate 16 is arranged at one end of the pipe 2; the pipe fixing structure 14 passes through the support plate 16 and is rotatably connected to the support plate 16, and the support plate 16 can support the rotation of the pipe fixing structure 14; the pipe fixing structure 14 is tightly fitted with the pipe 2; the output end of the second motor 15 is fixedly connected to one end of the pipe fixing structure 14.

[0077] In this embodiment, the pipe fixing structure 14 is an internal expansion structure, which is relatively common in the market and is a prior art, and will not be described in detail here; the model of the second motor 15 is selected according to actual needs and meets the working conditions.

[0078] The pipe 2 is fixed by the pipe fixing structure 14. When the pipe 2 needs to be rotated, the second motor 15 is started. The output end of the second motor 15 drives the pipe 2 to rotate through the pipe fixing structure 14, thereby rotating the pipe 2 to achieve bending at any angle.

[0079] like Figure 2 As shown, the feeding device includes: a moving plate 17 , a threaded rod 18 and a third motor 19 .

[0080] Specifically, the top end of the moving plate 17 is fixedly connected to the bottom end of the supporting plate 16 , and the moving plate 17 drives the supporting plate 16 to move horizontally; the threaded rod 18 passes through the corresponding position of the moving plate 17 and is threadedly connected to the moving plate 17 .

[0081] In this embodiment, when the threaded rod 18 rotates, the movable plate 17 will move horizontally. During this process, the movable plate 17 can only move horizontally under the restriction of the workbench 1.

[0082] The output end of the third motor 19 is fixedly connected to one end of the threaded rod 18 , and the output end of the third motor 19 can drive the threaded rod 18 to rotate.

[0083] When feeding is required, the third motor 19 is started, and the output end of the third motor 19 drives the threaded rod 18 to rotate; the threaded rod 18 causes the movable plate 17 to move horizontally; the movable plate 17 drives the pipe 2 to move through the supporting assembly to perform feeding.

[0084] The limiting assembly 3 is composed of a support frame and a limiting wheel, and both ends of the limiting wheel are rotatably connected to the support frame.

[0085] When bending a pipe 2 with a smaller outer diameter, there is a gap between the limiting wheel and the pipe 2, which causes an error in the bending angle and is inconvenient to use.

[0086] In order to solve the above problem, this embodiment proposes an implementation method, the pipe bending device also includes: an adjustment device; the adjustment device is fixedly connected to the bottom end of the support frame, and is used to adjust the position of the limit assembly 3.

[0087] In this embodiment, Figure 4 As shown, the adjusting device includes: a vertical rod 20, a second sliding block 21, a grooved roller 22 and a fourth motor 23.

[0088] Among them, the top end of the vertical rod 20 is fixedly connected to the support frame, and the vertical rod 20 can drive the support frame to move; a third cylindrical pin is arranged on the surface of the vertical rod 20; the second slider 21 is arranged at the bottom end of the vertical rod 20 and is fixedly connected to the vertical rod 20, and the second slider 21 is slidably connected to the workbench 1 through a second sliding groove opened on the upper end surface of the workbench 1.

[0089] In this embodiment, the second sliding block 21 can limit the moving direction of the vertical rod 20 .

[0090] The grooved roller 22 has inclined annular grooves connected end to end on its surface, and is slidably connected to the second slider 21 via the inclined annular grooves; the output end of the fourth motor 23 is fixedly connected to one end of the grooved roller 22 .

[0091] In this embodiment, when the grooved roller 22 rotates, the second slider 21 slides between the inclined annular groove and the second slider 21, so that the second slider 21 drives the vertical rod 20 to move; the model of the fourth motor 23 is selected according to actual needs and meets the working conditions.

[0092] When position adjustment is required, the fourth motor 23 is started, and the output end of the fourth motor 23 drives the grooved roller 22 to rotate; the grooved roller 22 slides between the inclined annular groove and the second slider 21, so that the second slider 21 drives the vertical rod 20 to move; the vertical rod 20 moves under the restriction of the second slider 21, and drives the limit assembly 3 to move; the fourth motor 23 is stopped after the limit wheel contacts the pipe 2, so that during bending, the limit wheel is always in contact with the pipe 2, and no error occurs.

[0093] Working principle:

[0094] When the tube bending device is in use, one end of the tube 2 is put on the tube fixing structure 14, and the tube 2 is fixed by the tube fixing structure 14; then the third motor 19, the output end of the third motor 19 drives the threaded rod 18 to rotate; the threaded rod 18 causes the movable plate 17 to move horizontally; the movable plate 17 drives the tube 2 to move through the supporting assembly, and stops after the other end of the tube 2 moves to between the two sets of fixing parts 9.

[0095] When it is necessary to fix the pipe 2 with a smaller outer diameter, adjust the electric push rod 5 so that the output end of the electric push rod 5 shrinks; at this time, the two groups of rotating rods 6 pull the two groups of moving parts 7 to move toward the middle at the same time while rotating downward; the moving part 7 will drive the first cylindrical pin to move; and through the sliding between the first cylindrical pin and the first through-groove, the rotating part 8 rotates toward the middle along the connection with the fixed shell 4; at this time, the rotating part 8 will slide between the second through-groove and the second cylindrical pin, so that the two groups of fixing parts 9 move horizontally toward the middle at the same time; the fixing part 9 will fix the pipe 2, and because the fixing part 9 uses a V-shaped notch instead of an arc-shaped contact surface, the fixing part 9 has at least two contact points with the pipe 2, thereby improving the fixing ability of the pipe 2; there is no need to replace the corresponding fixing block, and one fixing block can be used to fix pipes of different outer diameters, which is easy to use.

[0096] After the fixation is completed, the fourth motor 23 is started, and the output end of the fourth motor 23 drives the grooved roller 22 to rotate; the grooved roller 22 will slide between the inclined ring groove and the second slider 21, so that the second slider 21 drives the vertical rod 20 to move; the vertical rod 20 moves under the restriction of the second slider 21, and drives the limit assembly 3 to move; the fourth motor 23 is stopped after the limit wheel contacts the pipe 2, so that during bending, the limit wheel is always in contact with the pipe 2, and no error will occur.

[0097] Afterwards, the first motor 12 is started, and the output end of the first motor 12 drives the second bevel gear to rotate; the second bevel gear drives the first bevel gear to rotate slowly; the first bevel gear also drives the rotating plate 13 to rotate, and the rotating plate 13 causes the entire fixing device to move in a circle, so that one end of the pipe 2 is driven to bend under the restriction of the limit assembly 3, thereby achieving bending.

[0098] When bending at other angles, start the second motor 15, and the output end of the second motor 15 will drive the tube 2 to rotate through the tube fixing structure 14, thereby rotating the tube 2, and repeating the above process again, bending at any angle can be achieved, completing the use of this device.

[0099] Although the present invention has been shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A pipe bending device, characterized in that: include: A workbench (1) having a cavity formed therein; A support assembly, horizontally arranged above the workbench (1), and used to support the pipe (2); A feeding device, arranged inside the cavity and fixedly connected to the support assembly, used to push the pipe (2) to move horizontally through the support assembly; A limiting component (3) is fitted with the tube (2) and is used to limit the position of the tube (2) when bending; A fixing device, arranged at an end of the pipe (2) away from the supporting assembly, and used for fixing the pipe (2); A bending assembly is arranged in the cavity and fixedly connected to the fixing device, and is used to drive the fixing device to rotate to bend the tube (2).

2. The tube bending device according to claim 1, characterized in that: The fixing device comprises: A fixed housing (4) is arranged between the workbench (1) and the pipe (2); An electric push rod (5) is arranged inside the fixed housing (4); Two groups of rotating rods (6), one end of each group of rotating rods (6) being rotatably connected to the output end of the electric push rod (5); Two groups of moving parts (7), one end of each group of moving parts (7) is rotatably connected to the other end of the rotating rod (6), and the other end of the moving part (7) is slidably connected to the fixed housing (4); a first cylindrical pin is provided on the surface of the moving part (7); Two groups of rotating members (8), each group of rotating members (8) having a first through groove and a second through groove on its surface, wherein the first through groove is located below the second through groove; the rotating member (8) is slidably connected to the first cylindrical pin via the first through groove; and the bottom end of the rotating member (8) is rotatably connected to the fixed housing (4); Two groups of fixing members (9), each group of fixing members (9) being provided with a second cylindrical pin on its surface, the second cylindrical pin being located in the second through-groove and being slidably connected to the rotating member (8) via the second through-groove; Two groups of first sliding blocks (10), each group of first sliding blocks (10) is fixedly connected to the bottom of the fixing member (9), and the first sliding blocks (10) are slidably connected to the fixing shell (4) via a first sliding groove provided on the upper end surface of the fixing shell (4).

3. The tube bending device according to claim 2, characterized in that: A notch is formed on a side of the fixing member (9) close to the pipe (2).

4. The tube bending device according to claim 2, characterized in that: The bending assembly comprises: A rotating plate (13), one end of the rotating plate (13) being fixedly connected to the bottom end of the fixed housing (4); A bevel gear set (11) is composed of a first bevel gear and a second bevel gear, the edge of the first bevel gear is meshed with the edge of the second bevel gear, and the axis of the first bevel gear is fixedly connected to the other end of the rotating plate (13); A first motor (12), wherein an output end of the first motor (12) is fixedly connected to the axis of the second bevel gear.

5. The tube bending device according to claim 4, characterized in that: The axis of the first bevel gear and the central axis of the tube (2) are located in the same vertical plane.

6. The tube bending device according to claim 1, characterized in that: The support assembly comprises: A support plate (16) is arranged at one end of the pipe (2); The pipe fixing structure (14) penetrates the support plate (16) and is rotatably connected to the support plate (16); the pipe fixing structure (14) is tightly fitted to the pipe (2); A second motor (15), wherein an output end of the second motor (15) is fixedly connected to one end of the pipe fixing structure (14).

7. The tube bending device according to claim 6, characterized in that: The feeding device comprises: A movable plate (17), the top end of the movable plate (17) being fixedly connected to the bottom end of the support plate (16); A threaded rod (18) passes through a corresponding position of the movable plate (17) and is threadedly connected to the movable plate (17); A third motor (19), wherein an output end of the third motor (19) is fixedly connected to one end of the threaded rod (18).

8. The tube bending device according to claim 1, characterized in that: The limiting assembly (3) consists of a support frame and a limiting wheel, and both ends of the limiting wheel are rotatably connected to the support frame.

9. The tube bending device according to claim 8, characterized in that: Also includes: An adjusting device; the adjusting device is fixedly connected to the bottom end of the support frame and is used to adjust the position of the limiting assembly (3).

10. The tube bending device according to claim 9, characterized in that: The regulating device comprises: A vertical rod (20), the top end of which is fixedly connected to the support frame; a third cylindrical pin is provided on the surface of the vertical rod (20); A second sliding block (21) is arranged at the bottom end of the vertical rod (20) and is fixedly connected to the vertical rod (20); the second sliding block (21) is slidably connected to the workbench (1) via a second sliding groove provided on the upper end surface of the workbench (1); A grooved roller (22), wherein the surface of the grooved roller (22) is provided with inclined annular grooves connected end to end, and the grooved roller (22) is slidably connected to the second sliding block (21) via the inclined annular grooves; A fourth motor (23), wherein an output end of the fourth motor (23) is fixedly connected to one end of the grooved roller (22).

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