Wrapping machine traction device for electromagnetic wire production

Abstract

The utility model relates to the technical field of electromagnetic wire traction, in particular to a wrapping machine traction device for electromagnetic wire production, which comprises a traction device shell. The two traction assemblies are both arranged in the traction device shell, a gap exists between the two traction assemblies, and the two traction assemblies are used for allowing an electromagnetic wire to penetrate through the gap; each traction assembly comprises two traction wheels, a transmission assembly and a first motor; the two groups of traction wheels are attached to the electromagnetic wire and are used for conveying the electromagnetic wire; the transmission assembly is connected with the axes of the two traction wheels and used for enabling the rotation directions of the two traction wheels to be the same. Through cooperation of the limiting assembly, the moving plates and the adjusting device, the adjusting device is started, the two moving plates can move towards the middle at the same time through the adjusting device, the two moving plates drive the limiting assembly to move, the limiting assembly makes contact with the electromagnetic wire, the electromagnetic wire is limited to the middle position, and the limiting process is simpler.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic wire traction, in particular to a traction device of a wrapping machine for electromagnetic wire production. Background Art

[0002] Electromagnetic wire, also known as winding wire, is an insulated wire used to manufacture coils or windings in electrical products. In the production process of electromagnetic wire, the electromagnetic wire needs to be reeled after wrapping the insulation. During the reeling process, the electromagnetic wire is directly pulled by a reeling machine, which will cause the electromagnetic wire to be subjected to greater force, causing the electromagnetic wire to be thinner and causing the size of the electromagnetic wire to not meet the regulations. Therefore, a traction device is required to transport the electromagnetic wire.

[0003] However, when the existing traction device of the wrapping machine for electromagnetic wire production is in use, the electromagnetic wire is transported by rotating the traction wheel. In order to ensure that the electromagnetic wire is always in the center position, it is necessary to limit the position during the traction process. Most of them need to install limiting rollers on the front and back sides of the electromagnetic wire. Due to the different sizes of different electromagnetic wires, it is necessary to adjust the distance between the limiting rollers. The existing adjustment method is to limit the position by removing the screws and re-fixing them. This method is prone to errors and cannot ensure that the electromagnetic wire is limited to the middle position. In addition, the adjustment process is relatively cumbersome. Utility Model Content

[0004] The purpose of the utility model is to solve the problems that the existing traction device of the wrapping machine for electromagnetic wire production is prone to errors during adjustment, the electromagnetic wire cannot be restricted to the middle position, and the adjustment process is relatively complicated.

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

[0006] A traction device for a wrapping machine for producing electromagnetic wires, comprising:

[0007] Traction device housing;

[0008] Two groups of traction components are both arranged inside the traction device housing, and there is a gap between the two groups of traction components for the electromagnetic wire to pass through the gap; each group of traction components includes: two groups of traction wheels, a transmission component and a first motor;

[0009] Two sets of traction wheels, both of which are fitted with the electromagnetic wire and used to transport the electromagnetic wire;

[0010] A transmission assembly, the transmission assembly is connected to the axles of the two groups of traction wheels and is used to make the two groups of traction wheels rotate in the same direction;

[0011] A first motor, the first motor is connected to the axis of the traction wheel and is used to drive the traction wheel to rotate;

[0012] Two sets of limit assemblies are both arranged inside the traction device housing and located on both sides of the electromagnetic wire, and are used to limit the electromagnetic wire to a middle position;

[0013] Two groups of movable plates are respectively arranged above the two groups of the limit assemblies and connected to the limit assemblies to drive the limit assemblies to move horizontally;

[0014] The adjusting device is arranged on the upper part of the inner part of the traction device housing and is connected to the two groups of the movable plates, and is used for adjusting the position of the limiting assembly through the movable plates.

[0015] Preferably, each group of the limiter components includes:

[0016] A support frame is arranged below the movable plate, the support frame is composed of a first vertical plate and two groups of first horizontal plates, and the two ends of the first vertical plate are respectively vertically connected to one end of the two groups of first horizontal plates, and a slideway is provided on one side of the two groups of first horizontal plates close to the first vertical plate;

[0017] A mounting frame is arranged between the two groups of the first transverse plates, the mounting frame is composed of a second vertical plate, a rotation shaft and two groups of the second transverse plates, the two ends of the second vertical plate are respectively vertically connected to one end of the two groups of the second transverse plates, and the two ends of the rotation shaft are respectively vertically connected to the center of the two groups of the second transverse plates;

[0018] A limiting roller, sleeved on the surface of the rotating shaft and rotatably connected to the rotating shaft;

[0019] Two groups of moving blocks are respectively arranged in the slideway, one end of the two groups of moving blocks is slidably connected to the support frame through the slideway, and the other end is fixedly connected to the mounting frame, and a spring is connected between the moving block and the vertical plate.

[0020] Preferably, the adjusting device comprises:

[0021] Two groups of moving parts are arranged between the two groups of moving plates, and one end of each group of moving parts is connected to the moving plate, and the other end is provided with a first cylindrical pin;

[0022] A rotating plate, both ends of which are provided with first sliding grooves, and the rotating plate is slidably connected with the first cylindrical pin through the first sliding grooves;

[0023] A worm wheel, the axis of which is connected to the center of the rotating plate, and is used to drive the rotating plate to rotate;

[0024] A worm, disposed above the worm wheel and meshingly connected with the worm wheel;

[0025] A second motor, wherein an output end of the second motor is connected to the worm gear to drive the worm gear to rotate.

[0026] Preferably, the two groups of moving parts are symmetrical along the center of the rotation axis of the worm gear.

[0027] Preferably, the surface of the movable plate is arranged on a slider, and the slider is slidably connected to the traction device housing via a slide rail provided on the traction device housing, so as to limit the movable plate to horizontal movement only.

[0028] Preferably, it also includes: a travel switch; the travel switch is electrically connected to the second motor and is used to control the stop of the second motor.

[0029] Preferably, the travel switch and the mounting bracket are in the same plane, so that the mounting bracket can contact the travel switch and trigger the travel switch when moving.

[0030] Preferably, each group of the transmission components comprises:

[0031] Support shell;

[0032] Two sets of rotating wheels, each set of rotating wheels is coaxially arranged with the traction wheel;

[0033] The rotating rack is arranged on the edges of the two groups of rotating wheels and meshedly connected with the rotating wheels so that the rotating directions of the two groups of rotating wheels are the same.

[0034] Preferably, it further comprises: a manual driving device; the manual driving device is connected to an end of the worm away from the second motor, and is used for manually driving the worm to rotate.

[0035] Preferably, the manual drive device comprises:

[0036] A hollow cylinder connected to the worm;

[0037] A frame is arranged inside the hollow cylinder, the frame is composed of two groups of third vertical plates and third horizontal plates, and the two groups of the third vertical plates are arranged between the two groups of the third horizontal plates;

[0038] A rotating disk connected to the third vertical plate away from the hollow cylinder, and used to drive the frame to rotate;

[0039] A screw rod, passing through the third vertical plate close to the hollow cylinder, and rotatably connected to the frame;

[0040] A hand wheel connected to the screw rod and used to drive the screw rod to rotate;

[0041] A nut, threadedly connected to the screw;

[0042] Two sets of inclined plates are symmetrically arranged at both ends of the nut and connected to the nut. A second sliding groove is provided at one end of the inclined plate away from the nut to move with the nut.

[0043] Two groups of limit blocks, each group of limit blocks passes through the third cross plate and is slidably connected to the third cross plate, a second cylindrical pin is arranged on the surface of the limit block, and the second cylindrical pin is arranged in the second slide groove and is slidably connected to the inclined plate through the second slide groove.

[0044] The beneficial effect proposed by the utility model is that through the cooperation between the limit assembly, the movable plate and the adjustment device, the adjustment device is started, and the adjustment device causes the two groups of movable plates to move toward the middle at the same time. The two groups of movable plates drive the limit assembly to move, so that the limit assembly contacts the electromagnetic wire, and the electromagnetic wire is limited to the middle position, making the limit process simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the structure of the utility model;

[0046] Figure 2 for Figure 1 The left side plan view of the internal connection structure;

[0047] Figure 3 for Figure 2 Schematic diagram of the connection structure at A in the middle;

[0048] Figure 4 for Figure 1 Schematic diagram of the main plan view of the internal part connection structure;

[0049] Figure 5 This is a schematic diagram of the connection structure of Example 2;

[0050] Figure 6 for Figure 5 Schematic diagram of the connection structure at B in the middle.

[0051] In the figure: 1, traction device housing, 2, traction wheel, 3, support housing, 4, rotating wheel, 5, rotating rack, 6, first motor, 7, limit roller, 8, mounting frame, 9, moving block, 10, supporting frame, 11, travel switch, 12, moving plate, 13, moving part, 14, rotating plate, 15, worm gear, 16, worm, 17, second motor, 18, hollow cylinder, 19, frame, 20, screw, 21, hand wheel, 22, nut, 23, inclined plate, 24, limit block, 25, turntable. DETAILED DESCRIPTION

[0052] The utility model is further described below in conjunction with the accompanying drawings:

[0053] Embodiment 1:

[0054] See also Figure 1-4 In this embodiment: a traction device for a wrapping machine for electromagnetic wire production includes: a traction device housing 1, two groups of traction components, two groups of limit components, two groups of moving plates 12 and an adjusting device.

[0055] Among them, the two groups of traction components are both arranged inside the traction device housing 1, and there is a gap between the two groups of traction components for allowing the electromagnetic wire to pass through the gap. When the two groups of traction components are in operation, the rotation directions are opposite; each group of traction components includes: two groups of traction wheels 2, a transmission component and a first motor 6.

[0056] Specifically, the two groups of traction wheels 2 are both in contact with the electromagnetic wire and are used to convey the electromagnetic wire; the transmission assembly is connected to the axles of the two groups of traction wheels 2 to make the two groups of traction wheels 2 rotate in the same direction; the first motor 6 is connected to the axle of the traction wheel 2 to drive the traction wheel 2 to rotate, and the model of the first motor 6 is selected according to actual needs as long as it meets the working conditions.

[0057] In this embodiment, two groups of limit assemblies are arranged inside the traction device housing 1 and are located on both sides of the electromagnetic wire, and are used to limit the electromagnetic wire to the middle position. The limit assemblies and the traction assemblies are not in the same horizontal plane; two groups of movable plates 12 are respectively arranged above the two groups of limit assemblies and are connected to the limit assemblies to drive the limit assemblies to move horizontally; the adjustment device is arranged above the inside of the traction device housing 1 and is connected to the two groups of movable plates 12, and is used to adjust the position of the limit assemblies through the movable plates 12.

[0058] Each set of limiting components includes: a supporting frame 10 , a mounting frame 8 , a limiting roller 7 and two sets of moving blocks 9 .

[0059] Among them, the support frame 10 is arranged below the movable plate 12, the support frame 10 is composed of a first vertical plate and two groups of first horizontal plates, and the two ends of the first vertical plate are respectively vertically connected to one end of the two groups of first horizontal plates, and a slideway is provided on the side of the two groups of first horizontal plates close to the first vertical plate; the mounting frame 8 is arranged between the two groups of first horizontal plates, the mounting frame 8 is composed of a second vertical plate, a rotating shaft and two groups of second horizontal plates, the two ends of the second vertical plate are respectively vertically connected to one end of the two groups of second horizontal plates, and the two ends of the rotating shaft are respectively vertically connected to the center of the two groups of second horizontal plates; the limiting roller 7 is sleeved on the surface of the rotating shaft and is rotatably connected to the rotating shaft, and the limiting roller 7 is used to reduce the friction of the electromagnetic wire during movement; the two groups of moving blocks 9 are respectively arranged in the slideway, one end of the two groups of moving blocks 9 is slidably connected to the support frame 10 through the slideway, and the other end is fixedly connected to the mounting frame 8, a spring is connected between the moving block 9 and the vertical plate, and the moving block 9 will compress the spring when it moves toward the vertical plate, and the elastic coefficient of the spring is 10-30N / cm.

[0060] When the support frame 10 moves, the support frame 10 will simultaneously drive the mounting frame 8, the limiting roller 7 and the two sets of moving blocks 9 to move. After the limiting roller 7 contacts the electromagnetic wire, as the support frame 10 continues to move, the limiting roller 7 will stop moving under the restriction of the electromagnetic wire, so that the moving block 9 moves along the slide and compresses the spring. After the mounting frame 8 contacts the travel switch 11, the travel switch 11 will be triggered and the mounting frame 8 will stop moving. At this time, the spring will accumulate the elastic force of the movement, so that the limiting roller 7 is in full contact with the electromagnetic wire without causing excessive pressure to damage the electromagnetic wire.

[0061] The adjusting device comprises two groups of moving parts 13 , a rotating plate 14 , a worm gear 15 , a worm 16 and a second motor 17 .

[0062] Specifically, two groups of moving parts 13 are arranged between the two groups of moving plates 12, and one end of each group of moving parts 13 is connected to the moving plate 12, and the other end is provided with a first cylindrical pin. The moving parts 13 are used to drive the moving plate 12 to move horizontally; both ends of the rotating plate 14 are provided with a first slide groove, and are slidably connected with the first cylindrical pin through the first slide groove. When the rotating plate 14 rotates, the two groups of moving parts 13 will slide toward the middle or toward the outside at the same time through the sliding between the first slide groove and the first cylindrical pin; the axis of the worm gear 15 is connected to the center of the rotating plate 14, and is used to drive the rotating plate 14 to rotate; the worm 16 is arranged above the worm gear 15, and is meshed with the worm gear 15. When the worm gear 16 rotates, it will drive the worm gear 15 to rotate; the output end of the second motor 17 is connected to the worm gear 16, and is used to drive the worm gear 16 to rotate. The model of the second motor 17 is selected according to actual needs and meets the working conditions.

[0063] Start the second motor 17, and the output end of the second motor 17 drives the worm 16 to rotate, and the worm 16 drives the worm wheel 15 to rotate, and the worm wheel 15 drives the rotating plate 14 to rotate at the same time. The rotating plate 14 slides between the first slide groove and the first cylindrical pin, so that the two groups of moving parts 13 move toward the middle at the same time. The moving part 13 drives the limiting assembly to move through the moving plate 12, so that the limiting assembly contacts the electromagnetic wire, and limits the electromagnetic wire to the middle position, making the limiting process simpler.

[0064] The two groups of moving parts 13 are symmetrical along the rotation axis of the worm gear 15 .

[0065] The surface of the moving plate 12 is arranged on a slider, and the slider is slidably connected to the traction device housing 1 via a slide rail provided on the traction device housing 1, so as to limit the moving plate 12 to move only horizontally.

[0066] The traction device of the wrapping machine for electromagnetic wire production also includes: a travel switch 11; the travel switch 11 is electrically connected to the second motor 17 and is used to control the stop of the second motor 17. The model of the travel switch 11 is selected according to actual needs and meets the working conditions.

[0067] The travel switch 11 and the mounting bracket 8 are in the same plane, so that the mounting bracket 8 can contact the travel switch 11 when moving, thereby triggering the travel switch 11 .

[0068] Each transmission assembly includes: a supporting shell 3, two sets of rotating wheels 4 and a rotating rack 5.

[0069] Each set of rotating wheels 4 is coaxially arranged with the traction wheel 2; the rotating rack 5 is arranged at the edge of the two sets of rotating wheels 4 and meshedly connected with the rotating wheels 4, so that the two sets of rotating wheels 4 rotate in the same direction.

[0070] Working principle:

[0071] When the traction device of the wrapping machine for electromagnetic wire production is in use, the user passes the electromagnetic wire through the traction component, the limit component and the adjustment device in sequence, and then starts the second motor 17. The output end of the second motor 17 drives the worm 16 to rotate, and the worm 16 drives the worm wheel 15 to rotate. The worm wheel 15 also drives the rotating plate 14 to rotate. The rotating plate 14 slides between the first slide groove and the first cylindrical pin, so that the two groups of moving parts 13 move toward the middle at the same time. The moving part 13 drives the limit component to move through the moving plate 12, so that the limit component contacts the electromagnetic wire and limits the electromagnetic wire to the middle position, making the limiting process simpler. When the support frame 10 moves, the support frame 10 will simultaneously drive the mounting frame 8 and the limit roller 7 And the two groups of moving blocks 9 move. After the limiting roller 7 contacts the electromagnetic wire, as the support frame 10 continues to move, the limiting roller 7 will stop moving under the restriction of the electromagnetic wire, so that the moving block 9 moves along the slideway and compresses the spring. After the mounting frame 8 contacts the travel switch 11, the travel switch 11 will be triggered and the moving block 9 will stop moving. At this time, the spring will accumulate the elastic force of movement, so that the limiting roller 7 is in full contact with the electromagnetic wire without causing excessive pressure to damage the electromagnetic wire. Then the first motor 6 is started, and the first motor 6 will drive the traction wheel 2 to rotate. Through the transmission assembly, the traction wheel 2 above the electromagnetic wire will rotate in the same direction, so that the electromagnetic wire moves slowly, realizing the traction process, and completing the use of this device.

[0072] Embodiment 2:

[0073] See also Figure 5 , Figure 6 In this embodiment: a traction device for a wrapping machine for electromagnetic wire production also includes: a manual driving device; the manual driving device is connected to the end of the worm 16 away from the second motor 17, and is used to manually drive the worm 16 to rotate.

[0074] The manual drive device comprises: a hollow cylinder 18 , a frame 19 , a turntable 25 , a screw rod 20 , a hand wheel 21 , a nut 22 , two sets of inclined plates 23 and two sets of limit blocks 24 .

[0075] The hollow cylinder 18 is connected to the worm 16, and the hollow cylinder 18 can drive the worm 16 to rotate; the frame 19 is arranged inside the hollow cylinder 18, and the frame 19 is composed of two sets of third vertical plates and a third horizontal plate, and the two sets of third vertical plates are arranged between the two sets of third horizontal plates; the turntable 25 is connected to the third vertical plate away from the hollow cylinder 18, and is used to drive the frame 19 to rotate; the screw 20 passes through the third vertical plate close to the hollow cylinder 18, and is rotatably connected to the frame 19; the handwheel 21 is connected to the screw 20, and is used to drive the screw 20 to rotate; the nut 22 is threadedly connected to the screw 20, and the screw 20 rotates When the nut 22 moves, the nut 22 will move horizontally; the two groups of inclined plates 23 are symmetrically arranged at the two ends of the nut 22 and are connected to the nut 22. The end of the inclined plate 23 away from the nut 22 is provided with a second slide groove, which moves with the nut 22; each group of limit blocks 24 passes through the third cross plate and is slidably connected to the third cross plate. A second cylindrical pin is arranged on the surface of the limit block 24, and the second cylindrical pin is arranged in the second slide groove and is slidably connected to the inclined plate 23 through the second slide groove. When the inclined plate 23 moves, it will slide between the second slide groove and the second cylindrical pin, so that the limit block 24 moves to the middle or to the outside at the same time.

[0076] Working principle:

[0077] When the second motor 17 is damaged, the hand wheel 21 is turned, and the hand wheel 21 drives the screw 20 to rotate. The screw 20 will move the nut 22 toward the direction of the hollow cylinder 18, and the nut 22 will drive the two sets of inclined plates 23 to move at the same time. The inclined plates 23 will slide between the second slide grooves and the second cylindrical pins, so that the limit blocks 24 move outward at the same time, so that the two sets of limit blocks 24 are tightly fitted with the hollow cylinder 18, and then the turntable 25 is turned. The turntable 25 will drive the worm 16 to rotate through the remaining structures of the manual drive device, so that the position of the limit assembly can be adjusted when the second motor 17 is damaged, completing the use of this device.

[0078] 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 traction device for a wrapping machine for producing electromagnetic wires, characterized in that: include: Traction device housing (1); Two groups of traction components are both arranged inside the traction device housing (1), and there is a gap between the two groups of traction components for allowing the electromagnetic wire to pass through the gap; each group of traction components comprises: two groups of traction wheels (2), a transmission component and a first motor (6); Two sets of traction wheels (2), both of which are in contact with the electromagnetic wire and are used to transport the electromagnetic wire; A transmission assembly, the transmission assembly being connected to the axles of the two groups of traction wheels (2) and used to make the two groups of traction wheels (2) rotate in the same direction; A first motor (6), the first motor (6) being connected to the axis of the traction wheel (2) and being used to drive the traction wheel (2) to rotate; Two sets of limiting components are arranged inside the traction device housing (1) and located on both sides of the electromagnetic wire, and are used to limit the electromagnetic wire to a middle position; Two groups of movable plates (12) are respectively arranged above the two groups of the limit assemblies and connected to the limit assemblies to drive the limit assemblies to move horizontally; The adjusting device is arranged above the interior of the traction device housing (1) and is connected to the two groups of movable plates (12) and is used for adjusting the position of the limiting assembly through the movable plates (12).

2. The traction device for a wrapping machine for producing electromagnetic wire according to claim 1, characterized in that: Each set of the limiter components comprises: A support frame (10) is arranged below the movable plate (12), the support frame (10) is composed of a first vertical plate and two groups of first horizontal plates, and the two ends of the first vertical plate are respectively vertically connected to one end of the two groups of first horizontal plates, and a slideway is provided on one side of the two groups of first horizontal plates close to the first vertical plate; A mounting frame (8) is arranged between the two groups of the first transverse plates, the mounting frame (8) is composed of a second vertical plate, a rotation shaft and two groups of the second transverse plates, the two ends of the second vertical plate are respectively vertically connected to one end of the two groups of the second transverse plates, and the two ends of the rotation shaft are respectively vertically connected to the center of the two groups of the second transverse plates; A limiting roller (7) is sleeved on the surface of the rotating shaft and is rotatably connected to the rotating shaft; Two groups of moving blocks (9) are respectively arranged in the slideway, one end of the two groups of moving blocks (9) is slidably connected to the support frame (10) through the slideway, and the other end is fixedly connected to the mounting frame (8), and a spring is connected between the moving block (9) and the vertical plate.

3. The traction device for the wrapping machine for electromagnetic wire production according to claim 2 is characterized in that: The regulating device comprises: Two groups of moving parts (13) are arranged between the two groups of moving plates (12), and one end of each group of moving parts (13) is connected to the moving plate (12), and the other end is provided with a first cylindrical pin; A rotating plate (14), both ends of which are provided with first sliding grooves, and the rotating plate (14) is slidably connected to the first cylindrical pin through the first sliding grooves; A worm wheel (15), the axis of which is connected to the center of the rotating plate (14) and is used to drive the rotating plate (14) to rotate; A worm (16) is disposed above the worm wheel (15) and meshedly connected with the worm wheel (15); A second motor (17), wherein an output end of the second motor (17) is connected to the worm (16) and is used to drive the worm (16) to rotate.

4. The traction device for a wrapping machine for producing electromagnetic wire according to claim 3, characterized in that: The two groups of moving parts (13) are symmetrical along the rotation axis of the worm gear (15).

5. The traction device for a wrapping machine for producing electromagnetic wire according to claim 1, characterized in that: The surface of the movable plate (12) is arranged on a slider, and the slider is slidably connected to the traction device housing (1) via a slide rail provided on the traction device housing (1), so as to limit the movable plate (12) to horizontal movement only.

6. The traction device for a wrapping machine for producing electromagnetic wire according to claim 3, characterized in that: Also includes: A travel switch (11); the travel switch (11) is electrically connected to the second motor (17) and is used to control the stopping of the second motor (17).

7. The traction device of the wrapping machine for electromagnetic wire production according to claim 6, characterized in that: The travel switch (11) and the mounting frame (8) are located in the same plane, so that the mounting frame (8) can contact the travel switch (11) when moving, thereby triggering the travel switch (11).

8. The traction device for a wrapping machine for producing electromagnetic wire according to claim 1, characterized in that: Each group of transmission components includes: Support housing (3); Two groups of rotating wheels (4), each group of rotating wheels (4) is coaxially arranged with the traction wheel (2); The rotating rack (5) is arranged on the edges of the two groups of rotating wheels (4) and is meshedly connected with the rotating wheels (4) so ​​that the two groups of rotating wheels (4) rotate in the same direction.

9. The traction device of the wrapping machine for electromagnetic wire production according to claim 3, characterized in that: Also includes: A manual drive device; the manual drive device is connected to an end of the worm (16) away from the second motor (17), and is used to manually drive the worm (16) to rotate.

10. The traction device of the wrapping machine for producing electromagnetic wire according to claim 9, characterized in that: The manual drive device comprises: A hollow cylinder (18) connected to the worm (16); A frame (19) is arranged inside the hollow cylinder (18), the frame (19) is composed of two groups of third vertical plates and third horizontal plates, and the two groups of third vertical plates are arranged between the two groups of third horizontal plates; A rotating disk (25) connected to the third vertical plate away from the hollow cylinder (18) and used to drive the frame (19) to rotate; A screw rod (20) passes through the third vertical plate near the hollow cylinder (18) and is rotatably connected to the frame (19); A hand wheel (21), connected to the screw rod (20), and used to drive the screw rod (20) to rotate; A nut (22) threadably connected to the screw rod (20); Two groups of inclined plates (23) are symmetrically arranged at two ends of the nut (22) and connected to the nut (22); a second sliding groove is provided at one end of the inclined plate (23) away from the nut (22) so as to move along with the nut (22); Two groups of limit blocks (24), each group of the limit blocks (24) penetrates the third transverse plate and is slidably connected to the third transverse plate, a second cylindrical pin is arranged on the surface of the limit block (24), and the second cylindrical pin is arranged in the second sliding groove and is slidably connected to the inclined plate (23) through the second sliding groove.

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