Synthetic leather cloth combination production line

Abstract

The invention relates to the technical field of cloth production, and provides a synthetic leather and cloth combined production line which comprises a rack and a bonding station arranged on the rack, and the bonding station comprises a bonding frame installed on the rack, two pressing rollers rotationally installed on the bonding frame and a cleaning assembly installed on the bonding frame. The cloth and the synthetic leather are arranged between the two pressing rollers in a penetrating manner; the cleaning assembly comprises a first scraping plate, a second scraping plate and a driving part, the first scraping plate is obliquely arranged on the bonding frame and abuts against the pressing roller, and a collecting box used for collecting glue is arranged at the end, away from the pressing roller, of the first scraping plate; the second scraper is slidably mounted on the upper surface of the first scraper, and the driving component is used for driving the second scraper to slide. The synthetic leather and cloth combined production line aims to reduce the situation that glue attached to the surface of a compaction roller enters the surface of synthetic leather / cloth.

Description

Technical Field

[0001] The present application relates to the technical field of fabric production, and in particular to a synthetic leather fabric combining production line. Background Art

[0002] In the production process of automotive interiors, synthetic leather and fabric need to be bonded together, and then the bonded mixed fabric is transported to an oven for drying.

[0003] When bonding synthetic leather and fabric, glue needs to be added between the synthetic leather and fabric; then the fabric and synthetic leather with glue are passed between two compacting rollers. However, when the two compacting rollers are bonding the synthetic leather and fabric, excess glue may overflow and adhere to the surface of the compacting rollers; since the compacting rollers are in a rotating state, the glue on the surface of the compacting rollers may enter the surface of the synthetic leather / fabric, thereby affecting the product quality. Summary of the invention

[0004] In order to reduce the amount of glue attached to the surface of the compacting roller entering the surface of the synthetic leather / cloth, the present application provides a synthetic leather-cloth combining production line.

[0005] The synthetic leather fabric combination production line provided in this application adopts the following technical solution: A synthetic leather fabric bonding production line comprises a frame and a bonding station arranged on the frame, wherein the bonding station comprises a bonding frame installed on the frame, two pressing rollers rotatably installed on the bonding frame, and a cleaning component installed on the bonding frame, and the fabric and the synthetic leather are inserted between the two pressing rollers; The cleaning assembly includes a first scraper, a second scraper and a driving component. The first scraper is tilted on the bonding frame and abuts against a pressure roller. A collection box for collecting glue is provided at one end of the first scraper away from the pressure roller. The second scraper is slidably installed on the upper surface of the first scraper, and the driving component is used to drive the second scraper to slide.

[0006] By adopting the above-mentioned technical scheme, the first scraper is in contact with the outer wall of the pressure roller, so as to scrape off the glue on the surface of the pressure roller and reduce the glue on the surface of the compaction roller from entering the surface of the synthetic leather / cloth, thereby maintaining the impact on the product quality; and the second scraper slides on the surface of the first scraper under the drive of the driving component, so as to scrape the glue on the surface of the first scraper toward one side of the collecting box and into the collecting box; and timely clean the glue on the surface of the first scraper, reduce the solidification of glue on the surface of the first scraper, and maintain the cleaning effect of the first scraper on the surface of the pressure roller.

[0007] Optionally, two groups of driving components are provided, both groups of driving components are arranged on the first scraper and are spaced apart along the extension direction of the pressure roller; the driving components include a plurality of conveying rollers rotatably mounted on the first scraper, a conveyor belt wound around the surface of all conveying rollers, and a driving member driving the conveying rollers to rotate, and the two ends of the second scraper are respectively connected to the conveyor belts of the two driving components.

[0008] By adopting the above-mentioned technical solution, when the driving member drives the conveying roller to rotate, the conveyor belt can be transported on the first scraper; when the connection point between the conveyor belt and the second scraper is located below the conveying roller, the second scraper abuts against the surface of the first scraper to scrape off the glue on the surface of the first scraper; and when the second scraper is transported to the end of the conveyor belt away from the clamping roller, the second scraper moves toward the side away from the first scraper and there is a gap between the second scraper and the first scraper to reduce the situation where the second scraper moves toward the side of the clamping roller and returns to its original state and brings glue to the clamping roller.

[0009] Optionally, a cleaning shell is sleeved on the outer wall of the second scraper, a guide rod is provided on the side wall of the cleaning shell, and the first scraper is provided with a sliding channel for the guide rod to slide, and the extension direction of the sliding channel is the same as the sliding direction of the second scraper.

[0010] By adopting the above-mentioned technical solution, when the guide rod moves in the sliding channel, the second scraper slides on the upper surface of the first scraper and moves toward one side of the collection box; and when the connection between the second scraper and the conveyor belt is transmitted from the bottom of the conveying roller to the top of the conveying roller, since the guide rod is slidably installed in the sliding channel, the second scraper can slide in the cleaning shell, so that the cleaning shell can scrape off the glue on the surface of the second scraper to maintain the cleaning effect of the second scraper on the surface of the first scraper.

[0011] Optionally, a clamping plate for abutting against the outer wall of the cleaning shell is provided at one end of the sliding channel away from the pressure roller, and a cleaning plate is slidably installed on the bottom wall of the clamping plate; the clamping plate is provided with a reversing member, and when the cleaning shell abuts against the clamping plate, the reversing member is used to drive the cleaning plate to abut against the bottom wall of the cleaning shell.

[0012] By adopting the above-mentioned technical solution, when the second scraper moves toward one side of the clamping plate and abuts against the clamping plate, the cleaning plate moves toward one side of the cleaning shell and abuts against the bottom wall of the cleaning shell. The cleaning plate can clean the glue on the bottom of the cleaning shell, further improving the cleaning effect of the glue on the surface of the second scraper.

[0013] Optionally, the reversing member includes a support seat installed on the side of the clamping plate away from the cleaning shell, a rotating rod rotatably installed on the support seat, and a reversing block slidably installed on the clamping plate, and telescopic rods are movably installed at both ends of the rotating rod, and the two telescopic rods are respectively hinged to the clamping plate and the cleaning plate.

[0014] By adopting the above-mentioned technical solution, when the reversing block abuts against the cleaning shell and pushes the reversing block toward the side away from the clamping roller, the telescopic rods at both ends of the rotating rod are respectively hinged to the reversing block and the cleaning plate, so that the rotating rod can be driven to rotate on the supporting seat; thereby, the cleaning plate moves toward the cleaning shell and cleans the glue at the bottom of the cleaning shell.

[0015] Optionally, the inner wall of the cleaning shell is provided with a rubber layer for abutting against the outer wall of the second scraper.

[0016] By adopting the above technical solution and providing a rubber layer, the friction between the cleaning shell and the second scraper can be increased, thereby improving the cleaning effect of the cleaning shell on the glue on the outer wall of the second scraper.

[0017] Optionally, the bonding frame is provided with a sliding rod, and the first scraper is provided with a mounting sleeve for being sleeved on an outer wall of the sliding rod, and the mounting sleeve is fixed to the sliding rod through a fixing member.

[0018] By adopting the above technical solution, by slidingly installing the first scraper on the sliding rod, the contact position between the first scraper and the pressure roller can be changed according to the size of the cloth, thereby improving the cleaning effect of the first scraper on the glue on the surface of the pressure roller.

[0019] Optionally, the fixing member is configured as a screw rod, the mounting sleeve is provided with a threaded hole, and the screw rod is threadably mounted in the threaded hole and abuts against an outer wall of the sliding rod.

[0020] By adopting the above technical solution, by setting the fixing member as a screw rod, the screw rod rotates in the threaded hole to make it close to the outer wall of the sliding rod, thereby reducing the free sliding of the installation sleeve on the sliding rod, that is, the installation sleeve is fixed to the sliding rod. In addition, the screw rod has a simple structure and a low price, which can reduce the production cost.

[0021] Optionally, two groups of cleaning components are provided, and both groups of cleaning components are installed on the sliding rod; the sliding rod has a rectangular cross-section, and the fixing part includes a gear, a telescopic part and two racks, and the two racks are respectively connected to two mounting sleeves; the gear is rotatably installed on the sliding rod through the telescopic part, and the two racks are meshed with the gear, and the sliding rod is provided with a tooth groove for the gear to be plugged in.

[0022] By adopting the above-mentioned technical solution, by disengaging the gear from the tooth groove and rotating it, since the two racks can mesh with the gear, the two mounting sleeves respectively connected to the two racks can be moved closer to / away from each other; thereby playing the role of simultaneously adjusting the positions of the two first scrapers, so that the two first scrapers can clean the glue attached to the two ends of the clamping roller, further improving work efficiency.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. The first scraper is in contact with the outer wall of the pressing roller, which can scrape off the glue on the surface of the pressing roller, reducing the glue on the surface of the compacting roller from entering the surface of the synthetic leather / cloth, thus maintaining the impact on product quality; while the second scraper can scrape the glue on the surface of the first scraper into the collection box, so as to clean the glue on the surface of the first scraper in time, reduce the glue solidification on the surface of the first scraper, and maintain the cleaning effect of the first scraper on the surface of the pressing roller; 2. By setting up a cleaning shell, the cleaning shell can scrape off the glue on the surface of the second scraper to maintain the cleaning effect of the second scraper on the surface of the first scraper; and by setting up a reversing member, the cleaning plate can scrape off the glue on the bottom of the cleaning shell to reduce the situation where the glue adheres to the bottom of the cleaning shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of Example 1; Figure 2 is a schematic structural diagram of the cleaning component of Example 1; Figure 3 yes Figure 2 A local enlarged view of point a; Figure 4 is a partial cross-sectional view of the sliding rod of Example 2; Figure 5 It is a schematic structural diagram of the telescopic member of Example 2.

[0025] Description of reference numerals: 1, frame; 11, reversing roller; 12, feeding pipe; 2, cloth conveying station; 21, first active roller; 22, first driven roller; 23, first motor; 3, synthetic leather conveying station; 31, second active roller; 32, second driven roller; 33, second motor; 4, bonding station; 41, bonding frame; 42, cleaning assembly; 421, first scraper; 422, second scraper; 423, driving component; 424, conveying roller; 425, conveyor belt; 426, driving member; 427, mounting frame; 428, collecting box; 43, pressing roller; 44, sliding rod; 441, Tooth groove; 45, mounting sleeve; 46, threaded hole; 47, fixing piece; 471, screw rod; 472, gear; 473, rack; 474, telescopic piece; 475, movable rod; 476, movable sleeve; 477, spring; 478, guide block; 479, guide groove; 48, sliding channel; 49, third motor; 5, cleaning shell; 51, rubber layer; 52, guide rod; 6, pressing plate; 61, cleaning plate; 62, connecting plate; 63, reversing piece; 64, supporting seat; 641, torsion spring; 65, rotating rod; 66, reversing block; 67, telescopic groove; 68, telescopic rod; 69, reversing hole. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-5 This application is described in further detail.

[0027] Embodiment 1: Example 1 of the present application discloses a synthetic leather fabric combining production line.

[0028] Reference Figure 1 A synthetic leather fabric bonding production line includes a frame 1, a bonding station 4 installed on the frame 1, a fabric conveying station 2 and a synthetic leather conveying station 3. The fabric conveying station 2 includes a first motor 23, a first active roller 21 and a first driven roller 22. The first active roller 21 and the first driven roller 22 are both rotatably installed on the frame 1. The fabric passes through the first active roller 21 and the first driven roller 22. The first motor 23 is used to drive the first active roller 21 to rotate to convey the fabric.

[0029] The synthetic leather conveying station 3 includes a second active roller 31, a second driven roller 32 and a second motor 33. The second driven roller 32 and the second rotating roller are both rotatably mounted on the frame 1. The synthetic leather is passed between the second active roller 31 and the second driven roller 32. The second motor 33 is used to drive the second active roller 31 to rotate so as to convey the synthetic leather. In this embodiment, the conveying direction of the synthetic leather at the synthetic leather conveying station 3 is opposite to the conveying direction of the fabric at the fabric conveying station 2, so as to make the structure of the production line more compact; the frame 1 is provided with a reversing roller 11, which is used to change the conveying direction of the fabric to facilitate the pasting of the synthetic leather and the fabric.

[0030] The frame 1 is provided with a feeding pipe 12, and the feeding pipe 12 is provided with a plurality of feeding holes for adding glue to the surface of the synthetic leather, and one end of the feeding pipe 12 is connected to an external feeding device.

[0031] The bonding station includes a bonding frame 41, a cleaning assembly 42 and two pressing rollers 43. The bonding frame 41 is installed on the frame 1 and is located at the rear end of the conveying direction of the reversing roller 11; the two pressing rollers 43 are rotatably installed on the bonding frame 41, and the bonding frame 41 is provided with a third motor 49 for driving one of the pressing rollers 43 to rotate; the synthetic leather and the cloth are passed between the two pressing rollers 43 for clamping and bonding.

[0032] Reference Figure 2, four groups of cleaning components 42 are provided, and two cleaning components 42 are respectively provided at the two ends of two pressing rollers 43; the bonding frame is provided with two sliding rods 44, and two cleaning components 42 are respectively installed on the two sliding rods 44. The cleaning components 42 include a first scraper 421, a second scraper 422 and a driving component 423. A mounting sleeve 45 is provided at the bottom of the first scraper 421, and the sliding rod 44 is inserted into the mounting sleeve 45. The mounting sleeve 45 is fixed to the sliding rod 44 through a fixing member 47.

[0033] In this embodiment, the fixing member 47 is configured as a screw 471, the sliding rod 44 is slidably installed in the threaded hole 46, and the screw 471 is threadedly installed in the threaded hole 46 and abuts against the outer wall of the sliding rod 44; when the size of the cloth changes, the abutment between the screw 471 and the outer wall of the sliding rod 44 is cancelled to change the connection position of the first scraper 421 and the sliding rod 44.

[0034] One end of the first scraper 421 is obliquely arranged on the surface of the pressure roller 43, and a collecting box 428 is arranged at the end of the first scraper 421 away from the pressure roller 43; the first scraper 421 can scrape the glue on the surface of the pressure roller 43, and the glue flows on the inclined first scraper 421 into the collecting box 428 to facilitate centralized processing of the glue.

[0035] There are two groups of driving components 423, both of which are arranged on the first scraper 421 and are spaced apart along the extension direction of the pressure roller 43; the driving components 423 include two conveying rollers 424, a conveyor belt 425 wound around the surfaces of the two conveying rollers 424, and a driving member 426 for driving the conveying rollers 424 to rotate, the first scraper 421 is provided with a mounting frame 427, and the conveying rollers 424 are rotatably mounted on the mounting frame 427. In this embodiment, the driving member 426 is configured as a fourth motor, which is mounted on the mounting frame 427 and connected to one of the conveying rollers 424; the conveying direction of the conveyor belt 425 is in the same direction as the extension direction of the first scraper 421, the second scraper 422 is in contact with the upper surface of the first scraper 421, and the two ends of the second scraper 422 are respectively connected to the sides of the conveyor belts 425 of the two conveying components that are close to each other.

[0036] The outer wall of the second scraper 422 is sleeved with a cleaning housing 5, and a rubber layer 51 is provided between the cleaning housing 5 and the second scraper 422; guide rods 52 are provided at opposite ends of the cleaning housing 5, and sliding channels 48 are provided at both sides of the first scraper 421, and the guide rods 52 are slidably installed in the sliding channels 48. When the second scraper 422 moves toward the side away from the first scraper 421 to cancel the contact with the first scraper 421, since the guide rods 52 are located in the sliding channels 48, the second scraper 422 can slide in the cleaning housing 5, so that the cleaning housing 5 scrapes off the glue attached to the surface of the second scraper 422, and maintains the cleaning effect of the second scraper 422 on the first scraper 421.

[0037] Reference Figure 3 A clamping plate 6 is provided on one side of the sliding channel 48 close to the collecting box 428, and the clamping plate 6 is used to abut against the side wall of the cleaning shell 5; a cleaning plate 61 is slidably installed on the clamping plate 6, and the cleaning plates 61 on the opposite sides of the first scraper 421 are connected by a connecting plate 62; the connecting plate 62 is used to abut against the bottom wall of the cleaning shell 5, and can clean the glue scraped off the bottom wall of the cleaning shell 5.

[0038] The clamping plate 6 is provided with a reversing member 63, which includes a support seat 64, a rotating rod 65 and a reversing block 66. The clamping plate 6 is provided with a reversing hole 69, and the reversing block 66 is slidably installed in the reversing hole 69; the support seat 64 is fixed to the side of the clamping plate 6 away from the pressing roller 43, and the rotating rod 65 is rotatably installed in the support seat 64; telescopic grooves 67 are provided at opposite ends of the rotating rod 65, and telescopic rods 68 are slidably installed in the telescopic grooves 67, and the two telescopic rods 68 are respectively rotatably connected to the reversing block 66 and the end of the cleaning plate 61 away from the pressing roller 43.

[0039] In this embodiment, a torsion spring 641 is arranged between the rotating rod 65 and the support seat 64. The elastic force of the torsion spring 641 is used to force the reversing block 66 to move toward the side of the pressure roller 43, that is, the elastic force of the torsion spring 641 can force the cleaning plate 61 to move toward the side away from the pressure roller 43.

[0040] When the connection between the second scraper 422 and the conveyor belt 425 is transmitted from the bottom of the conveyor roller 424 to the top of the conveyor roller 424, the cleaning shell 5 abuts against the reversing block 66 and pushes the reversing block 66 toward the side away from the clamping roller 43; since the telescopic rods 68 at both ends of the rotating rod 65 are respectively hinged to the reversing block 66 and the cleaning plate 61, the rotating rod 65 can be driven to rotate on the support seat 64, so that the cleaning plate 61 moves toward the cleaning shell 5 and cleans the glue at the bottom of the cleaning shell 5.

[0041] The implementation principle of a synthetic leather fabric combination production line in Example 1 of the present application is as follows: The first scraper 421 is in contact with the outer wall of the pressure roller 43, and can scrape off the glue on the surface of the pressure roller 43, reducing the glue on the surface of the compaction roller from entering the surface of the synthetic leather / cloth and maintaining the impact on product quality; and the second scraper 422 slides on the surface of the first scraper 421 under the transmission of the conveyor belt 425, and can scrape the glue on the surface of the first scraper 421 toward one side of the collecting box 428 and into the collecting box 428; thereby, the glue on the surface of the first scraper 421 is cleaned in time, the glue solidification on the surface of the first scraper 421 is reduced, and the cleaning effect of the first scraper 421 on the surface of the pressure roller 43 is maintained.

[0042] When the second scraper 422 moves toward one side of the pressure roller 43 again, the connection between the second scraper 422 and the conveyor belt 425 is transferred to the top of the conveyor roller 424, so that a gap can be created between the second scraper 422 and the first scraper 421, thereby reducing the possibility that the second scraper 422 pushes the glue on the surface of the first scraper 421 to the side of the pressure roller 43.

[0043] Embodiment 2: Example 2 of the present application discloses a synthetic leather fabric combining production line.

[0044] Reference Figure 4 and Figure 5 The difference between Example 2 and Example 1 is that: the cross-section of the sliding rod 44 is rectangular, the fixing member 47 includes a gear 472, a telescopic member 474 and two racks 473, the telescopic member 474 includes a movable sleeve 476, a movable rod 475 movably installed in the movable sleeve 476, and a spring 477 arranged between the movable rod 475 and the movable sleeve 476; a tooth groove 441 is opened on the upper surface of the sliding rod 44, the movable sleeve 476 is rotatably installed in the tooth groove 441, the gear 472 is fixed to the end of the movable rod 475 away from the movable sleeve 476, and the elastic force of the spring 477 is used to drive the gear 472 to be inserted into the tooth groove 441.

[0045] Reference Figure 4 In this embodiment, a guide block 478 is provided on the outer wall of the movable rod 475, and a guide groove 479 is provided on the inner wall of the movable sleeve 476 for the guide block 478 to slide; the cooperation between the guide block 478 and the guide groove 479 can reduce the self-rotation between the movable rod 475 and the movable sleeve 476.

[0046] The two racks 473 are respectively fixed to the two mounting sleeves 45 on the sliding rod 44, and the two racks 473 are meshed with the gear 472. By rotating the gear 472, the two mounting sleeves 45 connected to the two racks 473 can be moved closer to / away from each other, so that the two first scrapers 421 can clean the glue attached to the two ends of the pressing roller 43; and after the position of the first scraper 421 is adjusted, the gear 472 is inserted into the tooth groove 441, so that the two mounting sleeves 45 and the sliding rod 44 can be fixed.

[0047] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A synthetic leather fabric combining production line, characterized by: The invention comprises a frame (1) and a bonding station (4) arranged on the frame (1), wherein the bonding station (4) comprises a bonding frame (41) mounted on the frame (1), two pressing rollers (43) rotatably mounted on the bonding frame (41), and a cleaning component (42) mounted on the bonding frame (41), wherein the cloth and the synthetic leather are inserted between the two pressing rollers (43); the cleaning component (42) comprises a first scraper (421), a second scraper (422), and a driving component (423); the first scraper (421) is obliquely arranged on the bonding frame (41) and abuts against the pressing roller (43); a collecting box (428) for collecting glue is arranged at one end of the first scraper (421) away from the pressing roller (43); the second scraper (422) is slidably mounted on the upper surface of the first scraper (421), and the driving component (423) is used to drive the second scraper (422) to slide.

2. The synthetic leather fabric combining production line according to claim 1, characterized in that: The driving components (423) are provided with two groups, and the two groups of driving components (423) are both arranged on the first scraper (421) and are arranged at intervals along the extension direction of the pressure roller (43); the driving components (423) include a plurality of conveying rollers (424) rotatably mounted on the first scraper (421), a conveying belt (425) wound around the surface of all the conveying rollers (424), and a driving member (426) for driving the conveying rollers (424) to rotate, and the two ends of the second scraper (422) are respectively connected to the conveying belts (425) of the two driving components (423).

3. The synthetic leather fabric combining production line according to claim 2, characterized in that: The outer wall of the second scraper (422) is sleeved with a cleaning shell (5), the side wall of the cleaning shell (5) is provided with a guide rod (52), the first scraper (421) is provided with a sliding channel (48) for the guide rod (52) to slide, and the extension direction of the sliding channel (48) is the same as the sliding direction of the second scraper (422).

4. The synthetic leather fabric combining production line according to claim 3, characterized in that: An end of the sliding channel (48) away from the pressure roller (43) is provided with a pressing plate (6) for abutting against the outer wall of the cleaning shell (5); a cleaning plate (61) is slidably mounted on the bottom wall of the pressing plate (6); the pressing plate (6) is provided with a reversing member (63); when the cleaning shell (5) abuts against the pressing plate (6), the reversing member (63) is used to drive the cleaning plate (61) to abut against the bottom wall of the cleaning shell (5).

5. The synthetic leather fabric combining production line according to claim 4, characterized in that: The reversing member (63) comprises a support seat (64) mounted on a side of the abutting plate (6) away from the cleaning housing (5), a rotating rod (65) rotatably mounted on the support seat (64), and a reversing block (66) slidably mounted on the abutting plate (6), telescopic rods (68) being movably mounted at both ends of the rotating rod (65), and the two telescopic rods (68) being hingedly connected to the abutting plate (6) and the cleaning plate (61), respectively.

6. The synthetic leather fabric combining production line according to claim 3, characterized in that: The inner wall of the cleaning housing (5) is provided with a rubber layer (51) for abutting against the outer wall of the second scraper (422).

7. The synthetic leather fabric combining production line according to claim 1, characterized in that: The bonding frame (41) is provided with a sliding rod (44), and the first scraper (421) is provided with a mounting sleeve (45) for being sleeved on the outer wall of the sliding rod (44), and the mounting sleeve (45) is fixed to the sliding rod (44) via a fixing member (47).

8. The synthetic leather fabric combining production line according to claim 7, characterized in that: The fixing member (47) is configured as a screw rod (471), the mounting sleeve (45) is provided with a threaded hole (46), and the screw rod (471) is threadedly mounted in the threaded hole (46) and abuts against the outer wall of the sliding rod (44).

9. The synthetic leather fabric combining production line according to claim 7, characterized in that: The cleaning components (42) are provided in two groups, and the two groups of cleaning components (42) are both mounted on the sliding rod (44); the sliding rod (44) has a rectangular cross-section, and the fixing member (47) comprises a gear (472), a telescopic member (474), and two racks (473), and the two racks (473) are respectively connected to two mounting sleeves (45); the gear (472) is rotatably mounted on the sliding rod (44) through the telescopic member (474), and the two racks (473) are both meshed with the gear (472), and the sliding rod (44) is provided with a tooth groove (441) for the gear (472) to be inserted.

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