Weft yarn transfer device of warp knitting machine

Abstract

The utility model discloses a weft yarn transfer device of a warp knitting machine, which comprises a machine frame, a transfer mechanism is arranged at the upper end of the machine frame, a yarn guide mechanism is arranged at the upper end of the transfer mechanism, the transfer mechanism comprises two supporting plates arranged at the upper end of the machine frame, a translation mechanism is arranged on the outer sides of the two supporting plates, and a yarn guide mechanism is arranged at the lower end of the translation mechanism. Compared with the prior art, the weft yarn conveying device is reasonable in structural design and high in practicability, weft yarn can be effectively clamped and fixed and then conveyed conveniently, the weft yarn can be automatically clamped and loosened conveniently, the use effect can be improved conveniently, the yarn guide position of the weft yarn can be adjusted conveniently, and the weft yarn conveying device can be used for conveying the weft yarn conveniently. The use is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of warp knitting machines, in particular to a weft yarn transfer device of a warp knitting machine. Background Art

[0002] A warp knitting machine uses one or several groups of parallel weft yarns to form loops on all the working needles of the machine fed in the warp direction to form a knitted fabric. This method is called warp knitting, and the fabric is called warp knitted fabric. A warp knitting machine is mainly composed of a weaving mechanism, a comb bar slewing mechanism, a warp feeding mechanism, a pulling and winding mechanism, and a transmission mechanism. When warp knitting, it is necessary to introduce weft yarns into the warp knitting machine. The weft yarns are the yarns that are perpendicular to the edge of the fabric in the woven fabric, and the weft yarn transfer mechanism is a mechanism set up to introduce the weft yarns.

[0003] According to the patent number CN219731245U, a weft yarn transfer mechanism of a warp knitting machine includes a warp knitting machine body and a weft yarn transfer mechanism. The end of the support plate portion of the warp knitting machine body is protruding outward, and a mounting top seat is installed on the protruding support plate of the warp knitting machine body. Locking parts that can be quickly locked are fixedly provided at the edges of both sides of the mounting top seat. The weft yarn transfer mechanism is obliquely arranged on one side of the mounting top seat for transferring the weft yarn of the warp knitting machine body.

[0004] Although the above-mentioned sliding sleeve slides along the positioning axis in the positioning track, it can drive the coil body outside the sliding sleeve to move synchronously to adjust the position of the coil body outside the positioning track. At the same time, the positioning buckle at the edge of the coil body can be buckled outside the positioning track to fix the position, thereby achieving the effect of adjusting the position of the conductor coil to adapt to use. When in use, the weft yarn is guided through the transfer guide rod, winding column and conductor coil part, and the weft yarn is introduced into the warp knitting machine body for warp knitting.

[0005] However, when a roll of weft yarn is used up, it is necessary to replace it with a new one for re-delivery. The weft yarn needs to be re-threaded and delivered from the guide rod winding column and the guide coil. The operation is more troublesome and the use effect is poor. Therefore, we provide a weft yarn delivery device for a warp knitting machine to solve this problem. Utility Model Content

[0006] In order to overcome the above-mentioned shortcomings, the utility model aims to provide a technical solution of a weft yarn transfer device of a warp knitting machine that can solve the above-mentioned problems.

[0007] To achieve the above object, the present invention provides the following technical solution: a weft yarn transfer device for a warp knitting machine, comprising a frame, a transfer mechanism is mounted on the upper end of the frame, and a guide wire mechanism is mounted on the upper end of the transfer mechanism;

[0008] The transmission mechanism includes two support plates installed on the upper end of the frame, and a translation mechanism is commonly installed on the outer sides of the two support plates. The outer side of the translation mechanism is screwed with a clamping mechanism.

[0009] As a further solution of the present invention: the translation mechanism includes a mounting plate installed on the outside of the support plate, a servo motor is installed on the upper end of the mounting plate, a first screw rod and a second screw rod are respectively provided on the outside of the two support plates, and a support seat movably connected to the first screw rod and the second screw rod is installed on the outside of the two support plates, one end of the first screw rod is connected to the output end of the servo motor, and pulleys are installed on the output end of the servo motor and the outside of the second screw rod, and a belt is commonly connected on the outside of the pulley, and two sets of cams are installed on the outside of the first screw rod and the second screw rod.

[0010] As a further solution of the present invention: the clamping mechanism includes two threaded blocks screwed to the first screw rod and the second screw rod, the upper ends of the threaded blocks are connected to connecting plates, and the connecting plates are commonly connected to a fixed plate, and the outer side of the fixed plate is equidistantly provided with through grooves, and the upper and lower ends of the through grooves are respectively provided with a second movable groove and a first movable groove, and the inner cavity of the through grooves is provided with clamping components, and the upper ends of multiple groups of the clamping components are commonly connected to a pressure plate after passing through the second movable groove.

[0011] As a further solution of the present invention: the upper ends of the support plates are provided with sliding grooves, and the lower ends of the connecting plates are connected with sliders that are slidably connected thereto.

[0012] As a further solution of the present invention: the clamping assembly includes a connecting column connected to the pressure plate, the lower end of the connecting column passes through the second movable slot and is connected to the rectangular plate, the pressure plate and the fixed plate are equidistantly installed on one side thereof, the second spring is movably sleeved on the outer side of the connecting column, the lower end of the rectangular plate is provided with a T-slot, side blocks are screwed on both sides of the rectangular plate, the inner cavity of the T-slot is slidably connected with a T-block, the upper end of the T-block is provided with a mounting slot, the inner cavity of the mounting slot is installed with a magnet block, the upper end of the magnet block is fitted with the top of the inner cavity of the T-slot, the rectangular plate is made of magnetic metal material, the lower end of the T-block is connected to a rubber pressure block, the outer side of the rubber pressure block is provided with an arc-shaped clamping block, and the lower end of the arc-shaped clamping block is connected to a limit rod passing through the first movable slot.

[0013] As a further solution of the present invention: the wire mechanism includes a vertical plate installed on the upper end of the support plate, and a second roller is connected to the two vertical plates for common rotation, the outer sides of the vertical plates are provided with square grooves, the inner cavities of the square grooves are movably provided with bearing seats, the first rollers are connected to the bearing seats for common rotation, the outer sides of the bearing seats are installed with sliding bars, the outer sides of the vertical plates are installed with concave blocks corresponding to the positions of the square grooves, the slide bars are movably slidably connected to the inner cavity of the concave blocks, and the bottom end of the inner cavity of the concave blocks is installed with a first spring connected to the slide bar.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. A plurality of weft yarns are passed from the upper end of the first roller and then around the lower end of the second roller, and then through the clamping mechanism in the transmission mechanism, and then the clamping mechanism is driven to move by the translation mechanism, so as to transmit the weft yarns, which is convenient for the subsequent warp knitting machine to use after the wire is guided. When the translation mechanism drives the clamping mechanism to move, the weft yarns will be in a tight state during the subsequent transmission process, and then the weft yarns will press down the first roller, and the first roller drives the slide bar to move down through the bearing seat, and the slide bar slides down steadily in the inner cavity of the concave block and compresses the first spring, so as to facilitate the adjustment of the tightness of the weft yarn guide when moving, and facilitate the stable transmission of the weft yarns.

[0016] 2. When the translation mechanism drives the clamping mechanism to move and transfer the weft yarn, the clamping assembly effectively clamps and fixes the weft yarn, which facilitates the stable transportation and transfer of the weft yarn. The translation mechanism and the clamping mechanism cooperate with each other, so that when the weft yarn passes through the clamping mechanism, the rubber pressure block moves up and opens a distance from the bottom of the inner cavity of the arc-shaped clamping block, which facilitates threading. Subsequently, during the transfer process, the weft yarn is automatically tightened. Then, when the weft yarn is fed to the warp knitting machine for processing, the clamping state of the weft yarn is cancelled again, which facilitates the continuous transportation of the weft yarn and effectively improves the transfer effect.

[0017] 3. By manually moving the limit rod, the limit rod drives the arc clamping block, weft yarn, rubber pressure block and T-block to move, and the T-block moves stably in the inner cavity of the T-slot, which is convenient for adjusting the appropriate position of the weft yarn conductor and is easy to use. Under normal circumstances, the magnet block and the rectangular plate are magnetically attracted to each other, and the adjusted weft yarn conductor position is fixed, which is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the transmission mechanism and the wire mechanism of the utility model;

[0020] Figure 3This utility model Figure 2 A schematic diagram of the enlarged structure of the device in part A;

[0021] Figure 4 This is a schematic diagram of the three-dimensional structure of the transmission mechanism of the utility model;

[0022] Figure 5 This utility model Figure 4 The enlarged structural diagram of the device in part B is shown in FIG.

[0023] Figure 6 This utility model Figure 4 The enlarged structural diagram of the device in part C is shown in the figure;

[0024] Figure 7 This is a schematic diagram of the three-dimensional split structure of the clamping mechanism of the utility model;

[0025] Figure 8 It is a schematic diagram of the three-dimensional split structure of the clamping component of the present utility model.

[0026] The reference numerals and names in the figures are as follows:

[0027] Frame 1, transmission mechanism 3, support plate 31, translation mechanism 32, mounting plate 321, servo motor 322, first screw 323, pulley 324, belt 325, support seat 326, second screw 327, cam 328, clamping mechanism 33, threaded block 331, connecting plate 332, fixing plate 333, through slot 334, first movable slot 335, second movable slot 336, pressure plate 337, slider -338, wire guide mechanism-4, vertical plate-41, second roller-42, first roller-43, square groove-44, bearing seat-45, slide bar-46, concave block-47, first spring-48, slide groove-5, clamping assembly-6, connecting column-61, second spring-62, rectangular plate-63, T-slot-64, side block-65, T-block-66, rubber pressure block-67, mounting groove-68, magnet block-69, arc clamping block-610, limit rod-611. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] See also Figure 1-4A weft yarn transmission device of a warp knitting machine includes a frame 1, a transmission mechanism 3 is installed on the upper end of the frame 1, and a wire mechanism 4 is installed on the upper end of the transmission mechanism 3. The wire mechanism 4 includes a vertical plate 41 installed on the upper end of the support plate 31, and a second roller 42 is connected to the two vertical plates 41 for common rotation. The outer sides of the vertical plates 41 are provided with square grooves 44, and the inner cavities of the square grooves 44 are movably provided with bearing seats 45. The first rollers 43 are connected to the bearing seats 45 for common rotation, and the outer sides of the bearing seats 45 are installed with slides 46. A concave block 47 corresponding to the position of the square groove 44 is installed on the outer side of the vertical plate 41. The slide 46 is movably slidably connected to the inner cavity of the concave block 47, and the bottom end of the inner cavity of the concave block 47 is provided with a first spring 48 connected to the slide 46.

[0030] The weft yarns are transferred by passing multiple weft yarns from the upper end of the first roller 43 and then around the lower end of the second roller 42, and then passing through the clamping mechanism 33 in the transfer mechanism 3, and then the clamping mechanism 33 is driven to move by the translation mechanism 32, so as to facilitate the subsequent use of the warp knitting machine after the wire is guided. When the translation mechanism 32 drives the clamping mechanism 33 to move, the weft yarn will be in a taut state during the subsequent conveying process, and then the weft yarn will press down the first roller 43, and the first roller 43 drives the slide bar 46 to move down through the bearing seat 45, and the slide bar 46 slides steadily in the inner cavity of the concave block 47 and compresses the first spring 48, so as to facilitate the adjustment of the tightness of the weft yarn guide during movement, so as to facilitate the stable conveying and delivery of the weft yarn.

[0031] The transmission mechanism 3 includes two support plates 31 installed at the upper end of the frame 1, and a translation mechanism 32 is commonly installed on the outer sides of the two support plates 31. The translation mechanism 32 includes a mounting plate 321 mounted on the outer side of the support plate 31, and a servo motor 322 is installed on the upper end of the mounting plate 321. The outer sides of the two support plates 31 are respectively provided with a first screw rod 323 and a second screw rod 327. The outer sides of the two support plates 31 are each installed with a support seat 326 movably connected to the first screw rod 323 and the second screw rod 327. One end of the first screw rod 323 is connected to the output end of the servo motor 322, and the output end of the servo motor 322 and the outer side of the second screw rod 327 are both installed with a pulley 324, and a belt 325 is commonly connected to the outer side of the pulley 324. Two sets of cams 328 are installed on the outer sides of the first screw rod 323 and the second screw rod 327.

[0032] The first screw rod 323 is driven to rotate by the output end of the servo motor 322, and at the same time, the output end of the servo motor 322 is rotated through the pulley 324, and this pulley 324 drives another pulley 324 and the second screw rod 327 in its inner cavity to rotate through the belt 325, and the second screw rod 327 and the first screw rod 323 jointly drive the clamping mechanism 33 screwed thereto to move, so that the clamping mechanism 33 drives the clamped weft yarn to move and transfer.

[0033] The outer side of the translation mechanism 32 is screwed with a clamping mechanism 33, and the clamping mechanism 33 includes two threaded blocks 331 that are screwed with the first screw rod 323 and the second screw rod 327. The upper ends of the threaded blocks 331 are connected to a connecting plate 332, and the connecting plates 332 are commonly connected to a fixed plate 333. The outer side of the fixed plate 333 is equidistantly provided with through grooves 334, and the upper and lower ends of the through groove 334 are respectively provided with a second movable groove 336 and a first movable groove 335. The inner cavity of the through groove 334 is provided with a clamping assembly 6, and the upper ends of multiple groups of clamping assemblies 6 are commonly connected to a pressure plate 337 after passing through the second movable groove 336. The upper ends of the support plates 31 are provided with sliding grooves 5, and the lower ends of the connecting plates 332 are connected to sliders 338 that slide therewith.

[0034] The clamping assembly 6 includes a connecting column 61 connected to the pressure plate 337. The lower end of the connecting column 61 passes through the second movable groove 336 and is connected to the rectangular plate 63. The pressure plate 337 and the fixed plate 333 are equidistantly installed on one side thereof. The second spring 62 is movably sleeved on the outer side of the connecting column 61. The lower end of the rectangular plate 63 is provided with a T-slot 64. Both sides of the rectangular plate 63 are screwed with side blocks 65. The inner cavity of the T-slot 64 slides It is connected to a T-block 66, the upper end of which is provided with a mounting groove 68, the inner cavity of which is provided with a magnet block 69, the upper end of which is fitted with the top of the inner cavity of the T-slot 64, the rectangular plate 63 being made of a magnetic metal material, the lower end of the T-block 66 being connected to a rubber pressure block 67, the outer side of which is provided with an arc-shaped clamping block 610, the lower end of which is connected to a limiting rod 611 passing through the first movable slot 335.

[0035] When the second screw rod 327 and the first screw rod 323 rotate, the two cams 328 on the outside of the second screw rod 327 and the first screw rod 323 rotate. When the clamping mechanism 33 is in the initial position, the two cams 328 push the pressure plate 337 upward when rotating, and then the pressure plate 337 drives the connecting column 61, the rectangular plate 63, the T-block 66 and the rubber pressure block 67 to move upward, and stretches the second spring 62, so that the rubber pressure block 67 moves upward and is pulled away from the bottom of the inner cavity of the arc-shaped clamping block 610. It is convenient for the weft yarn to pass through the rubber pressure block 67 and the arc-shaped clamping block 610 after passing through the wire guide mechanism 4. When the second screw rod 327 and the first screw rod 323 continue to rotate, the threaded block 331 outside the second screw rod 327 and the first screw rod 323 moves, and the threaded block 331 is brought into contact with the connecting plate 332. When the cam 328 is in the unlock position, the locking cam 337 is in the unlock position, and the locking cam 337 is locked, so that the locking cam 337 is locked. When the servo motor 322 is turned off, the cam 328 is in a state of lifting the pressure plate 337, which makes it convenient for the weft yarn to cancel the clamped state, thereby facilitating feeding the warp knitting machine for processing, and manually moving the limit rod 611, and then the limit rod 611 drives the arc clamping block 610, the weft yarn, the rubber pressure block 67 and the T-block 66 to move, and the T-block 66 moves stably in the inner cavity of the T-slot 64, which makes it convenient to adjust the appropriate position of the weft yarn conductor and is easy to use. Under normal circumstances, the magnet block 69 is magnetically attracted to the rectangular plate 63, and the adjusted weft yarn conductor position is fixed, which is easy to use.

[0036] Working principle: The utility model is connected to the servo motor 322 through an external control switch. When in use, multiple weft yarns pass through the upper end of the first roller 43 and then around the lower end of the second roller 42, and then pass through the clamping mechanism 33 in the transmission mechanism 3, and then the clamping mechanism 33 is driven to move by the translation mechanism 32, so as to transfer the weft yarn, which is convenient for the subsequent warp knitting machine to use after the wire is guided. When the translation mechanism 32 drives the clamping mechanism 33 to move, the weft yarn will be in a taut state during the subsequent transportation process, and then the weft yarn will press down the first roller 43, and the first roller 43 drives the slide bar 46 to move down through the bearing seat 45, and the slide bar 46 slides down steadily in the inner cavity of the concave block 47 and compresses the first spring 48, so as to facilitate the adjustment of the weft yarn. The tightness of the guide during movement facilitates the stable conveying and delivery of the weft yarn, and by turning on the servo motor 322, the output end of the servo motor 322 drives the first screw rod 323 to rotate, and at the same time the output end of the servo motor 322 rotates through the pulley 324, and this pulley 324 drives another pulley 324 and the second screw rod 327 in its inner cavity to rotate through the belt 325, and the second screw rod 327 and the first screw rod 323 jointly drive the clamping mechanism 33 screwed thereto to move, which facilitates the clamping mechanism 33 to drive the clamped weft yarn to move and deliver, and when the second screw rod 327 and the first screw rod 323 rotate, the two cams 328 on the outside of the second screw rod 327 and the first screw rod 323 rotate, and when the clamping mechanism 33 is in the initial position When the cam 328 is in the state of being set, the two cams 328 push the pressure plate 337 upwards when rotating, and then the pressure plate 337 drives the connecting column 61, the rectangular plate 63, the T-block 66 and the rubber pressure block 67 to move upward, and stretches the second spring 62, so that after the rubber pressure block 67 moves up, a distance is opened between it and the bottom of the inner cavity of the arc-shaped clamping block 610, so that the weft yarn passes through the rubber pressure block 67 and the arc-shaped clamping block 610 after passing through the wire guide mechanism 4. After the cam 328 pushes the pressure plate 337 upward, it immediately moves away from the pressure plate 337, and the stretched second spring 62 automatically resets and drives the pressure plate 337 to move downward, and the pressure plate 337 drives the connecting column 61, the rectangular plate 63, the T-block 66 and the rubber pressure block 67 to move downward, and the rubber pressure block 67 is pressed down and clamps the weft yarn with the arc-shaped clamping block 610. After that, when the second screw rod 327 and the first screw rod 323 continue to rotate, the threaded block 331 on the outside of the second screw rod 327 and the first screw rod 323 moves, and the threaded block 331 drives the fixing plate 333 to move through the connecting plate 332, and then the fixing plate 333 and the pressure plate 337 move toward the direction of the frame 1, so that the pressure plate 337 is away from a set of cams 328, preventing the cams 328 from rotating a second time to push up the pressure plate 337 again. When the clamping mechanism 33 moves to its farthest distance, the second screw rod 327 and the other two cams 328 on the outside of the first screw rod 323 rotate, thereby pushing up the pressure plate 337 again. At this time, the servo motor 322 is turned off, so that the cam 328 is in a state of pushing up the pressure plate 337, which facilitates the cancellation of the weft yarn being clamped.This makes it easier to feed the warp knitting machine for processing. By manually moving the limit rod 611, the limit rod 611 drives the arc clamping block 610, the weft yarn, the rubber pressure block 67, and the T-block 66 to move. The T-block 66 moves stably in the inner cavity of the T-slot 64, making it easier to adjust the appropriate position of the weft yarn conductor and convenient to use. Under normal circumstances, the magnet block 69 is magnetically attracted to the rectangular plate 63, and the adjusted weft yarn conductor position is fixed, making it easy to use.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A weft yarn transfer device for a warp knitting machine, characterized in that: It comprises a frame (1), a transmission mechanism (3) is installed at the upper end of the frame (1), and a wire mechanism (4) is installed at the upper end of the transmission mechanism (3); The transmission mechanism (3) comprises two support plates (31) mounted on the upper end of the frame (1), a translation mechanism (32) being mounted on the outer sides of the two support plates (31), and a clamping mechanism (33) being screwed on the outer side of the translation mechanism (32).

2. The weft yarn transfer device of a warp knitting machine according to claim 1, characterized in that: The translation mechanism (32) includes a mounting plate (321) mounted on the outside of the support plate (31), a servo motor (322) is mounted on the upper end of the mounting plate (321), a first screw rod (323) and a second screw rod (327) are respectively provided on the outside of the two support plates (31), and a support seat (326) movably connected to the first screw rod (323) and the second screw rod (327) is mounted on the outside of the two support plates (31), one end of the first screw rod (323) is connected to the output end of the servo motor (322), the output end of the servo motor (322) and the outside of the second screw rod (327) are both mounted with a pulley (324), the outside of the pulley (324) is commonly connected with a belt (325), and two sets of cams (328) are both mounted on the outside of the first screw rod (323) and the second screw rod (327).

3. The weft yarn transfer device of a warp knitting machine according to claim 2, characterized in that: The clamping mechanism (33) includes two threaded blocks (331) that are screwed to the first screw rod (323) and the second screw rod (327), the upper ends of the threaded blocks (331) are connected to connecting plates (332), and the connecting plates (332) are commonly connected to a fixed plate (333), and the outer sides of the fixed plates (333) are equidistantly provided with through grooves (334), and the upper and lower ends of the through grooves (334) are respectively provided with a second movable groove (336) and a first movable groove (335), and the inner cavities of the through grooves (334) are each provided with a clamping assembly (6), and the upper ends of multiple groups of the clamping assemblies (6) are commonly connected to a pressure plate (337) after passing through the second movable groove (336).

4. The weft yarn transfer device of a warp knitting machine according to claim 3, characterized in that: The upper ends of the support plates (31) are each provided with a sliding groove (5), and the lower ends of the connecting plates (332) are each connected to a sliding block (338) that is slidably connected thereto.

5. The weft yarn transfer device of a warp knitting machine according to claim 3, characterized in that: The clamping assembly (6) includes a connecting column (61) connected to the pressure plate (337), the lower end of the connecting column (61) passes through the second movable groove (336) and is connected to the rectangular plate (63), and the second spring (62) is equidistantly installed on the side corresponding to the pressure plate (337) and the fixed plate (333), and the second spring (62) is movably sleeved on the outer side of the connecting column (61), and the lower end of the rectangular plate (63) is provided with a T-slot (64), and the two sides of the rectangular plate (63) are screwed with side blocks (65), and the inner cavity of the T-slot (64) is A T-shaped block (66) is slidably connected, and a mounting groove (68) is provided at the upper end of the T-shaped block (66). A magnet block (69) is installed in the inner cavity of the mounting groove (68). The upper end of the magnet block (69) is in contact with the top of the inner cavity of the T-shaped groove (64). The rectangular plate (63) is made of a magnetic metal material. The lower end of the T-shaped block (66) is connected to a rubber pressure block (67). An arc-shaped clamping block (610) is provided on the outer side of the rubber pressure block (67). The lower end of the arc-shaped clamping block (610) is connected to a limiting rod (611) passing through the first movable groove (335).

6. The weft yarn transfer device of a warp knitting machine according to claim 2, characterized in that: The wire mechanism (4) includes a vertical plate (41) installed on the upper end of the support plate (31), a second roller (42) is connected to the two vertical plates (41) in a common rotation, a square groove (44) is provided on the outer side of each vertical plate (41), a bearing seat (45) is movably provided in the inner cavity of each square groove (44), a first roller (43) is connected to the bearing seats (45) in a common rotation, a slide bar (46) is installed on the outer side of each bearing seat (45), a concave block (47) corresponding to the position of the square groove (44) is installed on the outer side of each vertical plate (41), the slide bar (46) is movably slidably connected to the inner cavity of the concave block (47), and a first spring (48) connected to the slide bar (46) is installed at the bottom end of the inner cavity of the concave block (47).

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