Light guide plate processing device

Abstract

The present invention belongs to the technical field of light guide plate processing, and discloses a light guide plate processing device, including a mounting seat, an adjusting motor is fixedly mounted on the top of the mounting seat, the output shaft of the adjusting motor is fixedly connected to a transmission shaft, a plurality of worm blocks are fixedly connected to the middle of the transmission shaft, a worm wheel is meshed on the top of the worm block, and a threaded rod is fixedly connected to the middle of the worm wheel. The present invention places the light guide plate that has been dotted and coated on the back on top of a plurality of suction cups. When the sealing plate on the left side of the suction cup leaves the mounting cavity, the space formed by the sealing plates on the left and right sides of the suction cup and the transmission belt will maintain a negative pressure state, so that the light guide plate is firmly adsorbed and moves with the transmission belt, thereby solving the problem that when the light guide plate is transported in the existing method, relative sliding and even scratches will occur between the light guide plate and the conveyor belt, and in severe cases, the edge of the light guide plate will collide with the conveyor device, resulting in a reduced product yield.

Description

Technical Field

[0001] The invention belongs to the technical field of light guide plate processing, and in particular relates to a light guide plate processing device. Background Art

[0002] A light guide plate is a transparent optical component, usually made of plastic (such as acrylic PMMA, polycarbonate PC). Its main function is to evenly distribute the light from a point light source or a line light source over a larger area to form a surface light source. The light guide plate achieves efficient transmission and uniform distribution of light through its special structural design and surface treatment. Light guide plates play an important role in modern automotive design and are widely used in instrument panels, central control screens, ambient lights and other parts to achieve uniform lighting effects and enhance overall aesthetics.

[0003] After the existing light guide plates are engraved and coated on the back, they need to be transported to subsequent processes for processing and testing. When the existing method is used to transport the light guide plates, since the surface of the conveyor belt and the coated surface of the light guide plates are relatively smooth, relative sliding will occur between the light guide plates and the conveyor belt, and even scratches will occur at the joints of the conveyor belts. In severe cases, the edges of the light guide plates will be bumped, which will reduce the yield rate of the product. In addition, when the existing method is used to post the shading strips on the sides of the light guide plates, the transport device needs to be stopped, and then the shading strips are posted on the sides of the light guide plates. The transport device will not continue to work until the completion, which seriously affects the transport efficiency. Summary of the invention

[0004] The object of the present invention is to provide a light guide plate processing device to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a light guide plate processing device, comprising a mounting seat, an adjusting motor is fixedly mounted on the top of the mounting seat, the output shaft of the adjusting motor is fixedly connected to a transmission shaft, a plurality of worm blocks are fixedly connected to the middle of the transmission shaft, a worm wheel is meshed on the top of the worm block, a threaded rod is fixedly connected to the middle of the worm wheel, the front side of the threaded rod is threadedly connected to a front plate, the rear side of the threaded rod is threadedly connected to a rear plate, an H bracket is arranged between two adjacent worm blocks, a suction mechanism is fixedly connected to the inner sides of the upper ends of the two H brackets, and the left and right sides of the suction mechanism Transmission rollers are provided at both ends, and the front and rear sides of the two transmission rollers are rotatably connected to support frames, the curved surfaces of the two transmission rollers are connected to transmission belts, the inner curved surface of the transmission belt is provided with a plurality of conical holes, a suction cup is fixedly installed inside the conical holes, a plurality of sealing plates are fixedly connected to the inner wall of the transmission belt, the front side of the transmission roller on the right side is fixedly connected to a transmission wheel, the right side of the support frame in front of the right side is fixedly connected to a driving motor, a driving wheel is fixedly connected to the output shaft of the driving motor, a synchronous belt is transmission-connected between the driving wheel and the transmission wheel, and a detection mechanism is fixedly installed above the H bracket in the middle.

[0006] Preferably, the front plate includes a front limit plate, the front side of the front limit plate is fixedly connected to a fixed plate, the upper surface of the fixed plate is rotatably connected to a rotating shaft and a rotating shaft, the upper end of the rotating shaft is fixedly connected to a shading belt, the middle part of the rotating shaft is fixedly connected to a clamping wheel, the upper surface of the fixed plate is fixedly connected to an outer shell, two groups of springs are fixedly connected to the inside of the outer shell, the other end of each group of springs is fixedly connected to a magnetic block, a cutting tool is fixedly connected between the two magnetic blocks, and an electromagnet is provided on the side of the magnetic block away from the spring.

[0007] Preferably, the rear plate includes a rear limit plate, the upper end of the rear limit plate is fixedly connected to a plurality of connecting rods, the lower end of the connecting rod is fixedly connected to a rubber wheel, the front of the rear limit plate is fixedly installed with a light-emitting mechanism, and the left and right ends of the rear limit plate are slidably connected to two sliding rods.

[0008] Preferably, the suction mechanism comprises a rectangular block, the upper surface of which is provided with a sliding groove, the bottom center of the sliding groove is connected to an installation cavity, a suction pump is fixedly installed at the bottom of the installation cavity, an air suction pipe is fixedly connected to the upper surface of the suction pump, and an exhaust pipe is fixedly connected to the back of the suction pump.

[0009] Preferably, the front and rear ends of the plurality of threaded rods are rotatably connected to a connecting plate, the connecting plate is fixedly connected to the plurality of H brackets, the plurality of H brackets are rotatably connected to the transmission shaft, and the two support frames on the left are fixedly connected to the mounting seat.

[0010] Preferably, the front limit plate is threadedly connected to the threaded rod, the upper end of the rotating shaft is rotatably connected to the front limit plate, the electromagnet is fixedly connected to the shell, and the two magnetic blocks are both slidably connected to the inside of the shell.

[0011] Preferably, the front and rear ends of the sliding rod are fixedly connected to the support frame, the sliding rod is slidably connected to the front limit plate, and the middle parts of the rear limit plate and the front limit plate are both adapted to the synchronous belt.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. The present invention places a light guide plate with engraved dots and a reflective film on the back above a plurality of suction cups. When the space formed between the sealing plates on the left and right sides of the suction cup and the transmission belt is connected to the installation cavity, the working suction pump extracts the gas in the formed space through the suction pipe and discharges it from the exhaust pipe to form a negative pressure, so that the lower surface of the light guide plate is tightly adsorbed. When the sealing plate on the left side of the suction cup leaves the installation cavity, the space formed by the sealing plates on the left and right sides of the suction cup and the transmission belt will maintain a negative pressure state, so that the light guide plate is in a firmly adsorbed state and moves with the transmission belt, thereby solving the problem of relative sliding between the light guide plate and the conveyor belt during transportation of the light guide plate in the existing method, and even scratches at the joint of the conveyor belt. In severe cases, the edge of the light guide plate may be bumped, thereby reducing the product yield.

[0014] 2. In the present invention, the light guide plate first contacts the rubber wheel and then contacts the pressure wheel. The pressure wheel will adhere one end of the shading tape to the front side of the light guide plate. The light guide plate continues to move to the right, which will drive the pressure wheel, the shading tape and the rotating shaft to rotate, and make the shading tape fit tightly with the front side of the light guide plate. When the light guide plate moves a certain distance to the right and leaves the pressure wheel, the electromagnet is quickly energized to push the two magnetic blocks and the cutting tool to quickly contact the moving shading tape and cut it off. When the light guide plate completely passes the pressure wheel, the shading tape will also be fully attached, thereby solving the problem that in the existing method, when the shading strip is pasted on the side of the light guide plate, the transportation device needs to be stopped and the shading strip is pasted on the side of the light guide plate. The transportation device can only continue to work after completion, which seriously affects the transportation efficiency.

[0015] 3. The present invention uses a suction pump to draw the gas in the space formed between the sealing plates on the left and right sides of the suction cup and the transmission belt into a negative pressure, so that the lower surface of the light guide plate is tightly adsorbed, but there is a gap between it and the transmission belt. When the light guide plate moves to the position of the light-emitting mechanism, the light-emitting mechanism will irradiate light into the interior of the light guide plate, and finally emit light from the upper surface to illuminate the lower surface of the detection mechanism. The detection mechanism will judge the quality of the light guide plate according to the intensity of the light, thereby avoiding the problem that the lower surface of the light guide plate is blocked by the transmission mechanism during detection, thereby increasing the reflectivity and causing errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the appearance structure of the present invention;

[0017] Figure 2 This is a half-section schematic diagram of the H bracket of the present invention;

[0018] Figure 3 This is a schematic diagram of the rear plate structure of the present invention;

[0019] Figure 4 A half-section schematic diagram of the installation cavity of the present invention;

[0020] Figure 5 It is a half-section schematic diagram of the shell of the present invention.

[0021] In the figure: 1, mounting base; 2, adjusting motor; 3, transmission shaft; 4, worm block; 5, worm wheel; 6, threaded rod; 7, front plate; 71, front limit plate; 72, fixing plate; 73, rotating shaft; 74, rotating shaft; 75, shading belt; 76, clamping wheel; 77, housing; 78, spring; 79, magnetic block; 710, cutting tool; 711, electromagnet; 8, rear plate; 81, rear limit plate; 82, connecting rod; 83, rubber wheel; 84 , light-emitting mechanism; 85, sliding rod; 9, H bracket; 10, suction mechanism; 101, rectangular block; 102, sliding groove; 103, installation cavity; 104, suction pump; 105, suction pipe; 106, exhaust pipe; 11, transmission roller; 12, support frame; 13, transmission belt; 14, tapered hole; 15, suction cup; 16, sealing plate; 17, transmission wheel; 18, driving motor; 19, driving wheel; 20, synchronous belt; 21, detection mechanism. DETAILED DESCRIPTION

[0022] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0023] like Figures 1 to 5As shown, an embodiment of the present invention provides a light guide plate processing device, including a mounting seat 1, an adjusting motor 2 is fixedly mounted above the mounting seat 1, an output shaft of the adjusting motor 2 is fixedly connected to a transmission shaft 3, a plurality of worm blocks 4 are fixedly connected to the middle of the transmission shaft 3, a worm wheel 5 is meshed above the worm block 4, a threaded rod 6 is fixedly connected to the middle of the worm wheel 5, a front side of the threaded rod 6 is threadedly connected to a front plate 7, a rear side of the threaded rod 6 is threadedly connected to a rear plate 8, an H bracket 9 is arranged between two adjacent worm blocks 4, a suction mechanism 10 is fixedly connected to the inner sides of the upper ends of the two H brackets 9, transmission rollers 11 are arranged at both left and right ends of the suction mechanism 10, and the front and rear sides of the two transmission rollers 11 are rotatably connected to The support frame 12 and the curved surface transmission of the two transmission rollers 11 are connected with a transmission belt 13, and the inner curved surface of the transmission belt 13 is provided with a plurality of conical holes 14, and a suction cup 15 is fixedly installed inside the conical hole 14, and a plurality of sealing plates 16 are fixedly connected to the inner wall of the transmission belt 13, and the front side of the right transmission roller 11 is fixedly connected with a transmission wheel 17, and the right side of the support frame 12 in front of the right side is fixedly connected with a driving motor 18, and a driving wheel 19 is fixedly connected to the output shaft of the driving motor 18, and a synchronous belt 20 is connected between the driving wheel 19 and the transmission wheel 17, and a detection mechanism 21 is fixedly installed above the middle H bracket 9, and the front plate 7 includes a front limit plate 71, and the front side of the front limit plate 71 is fixedly connected with a fixed plate 72, the upper surface of the fixed plate 72 is rotatably connected with a rotating shaft 73 and a rotating shaft 74, the upper end of the rotating shaft 73 is fixedly connected with a shading belt 75, the middle part of the rotating shaft 74 is fixedly connected with a clamping wheel 76, the upper surface of the fixed plate 72 is fixedly connected with a shell 77, the interior of the shell 77 is fixedly connected with two groups of springs 78, the other end of each group of springs 78 is fixedly connected with a magnetic block 79, a cutting tool 710 is fixedly connected between the two magnetic blocks 79, and an electromagnet 711 is provided on the side of the magnetic block 79 away from the spring 78, and its function is to first contact with the rubber wheel 83 through the light guide plate, and then contact with the clamping wheel 76, and the clamping wheel 76 will adhere one end of the shading belt 75 to the front side of the light guide plate , the light guide plate continues to move to the right, which will drive the clamping wheel 76, the shading belt 75, and the rotating shaft 73 to rotate, and make the shading belt 75 fit tightly with the front side of the light guide plate. When the light guide plate moves a distance to the right and leaves the clamping wheel 76, the electromagnet 711 is quickly energized to push the two magnetic blocks 79 and the cutting tool 710 to quickly contact the moving shading belt 75 and cut it off. When the light guide plate completely passes the clamping wheel 76, the shading belt 75 will also be fitted. This solves the problem that in the existing method, when the shading strip is pasted on the side of the light guide plate, the transportation device needs to be stopped, and the shading strip is pasted on the side of the light guide plate until the transportation device can continue to work after completion, which seriously affects the transportation efficiency.

[0024] Among them, the rear plate 8 includes a rear limit plate 81, the upper end of the rear limit plate 81 is fixedly connected to a plurality of connecting rods 82, the lower end of the connecting rod 82 is fixedly connected to a rubber wheel 83, the front of the rear limit plate 81 is fixedly installed with a light-emitting mechanism 84, the left and right ends of the rear limit plate 81 are slidably connected to two sliding rods 85, the suction mechanism 10 includes a rectangular block 101, the upper surface of the rectangular block 101 is provided with a sliding groove 102, the bottom center of the sliding groove 102 is connected to an installation cavity 103, a suction pump 104 is fixedly installed at the bottom of the installation cavity 103, the upper surface of the suction pump 104 is fixedly connected to a suction pipe 105, and the back of the suction pump 104 is fixedly connected to an exhaust pipe 106, which is used to place the light guide plate with dotted points and a reflective film on the back above the plurality of suction cups 15 When the space formed between the sealing plates 16 on the left and right sides of the suction cup 15 and the transmission belt 13 is connected to the installation cavity 103, the working suction pump 104 will extract the gas in the formed space through the suction pipe 105 and discharge it from the exhaust pipe 106 to form a negative pressure, so that the lower surface of the light guide plate is tightly adsorbed. When the sealing plate 16 on the left side of the suction cup 15 leaves the installation cavity 103, the space formed by the sealing plates 16 on the left and right sides of the suction cup 15 and the transmission belt 13 will maintain a negative pressure state, so that the light guide plate is in a state of being firmly adsorbed and moves with the transmission belt 13, thereby solving the problem that when the light guide plate is transported in the existing method, relative sliding will occur between the light guide plate and the conveyor belt, and even scratches will occur. In severe cases, the edge of the light guide plate will be bumped, thereby reducing the product yield.

[0025] Among them, the front and rear ends of multiple threaded rods 6 are rotatably connected with connecting plates, the connecting plates are fixedly connected to multiple H brackets 9, multiple H brackets 9 are rotatably connected to the transmission shaft 3, the two left support frames 12 are fixedly connected to the mounting seat 1, the front limit plate 71 is threadedly connected to the threaded rod 6, the upper end of the rotating shaft 74 is rotatably connected to the front limit plate 71, the electromagnet 711 is fixedly connected to the shell 77, the two magnetic blocks 79 are slidably connected to the inside of the shell 77, the front and rear ends of the sliding rod 85 are fixedly connected to the support frame 12, the sliding rod 85 is slidably connected to the front limit plate 71, and the rear limit plate 81 is rotatably connected to the middle of the front limit plate 71 It is adapted to the synchronous belt 20, and its function is to pump the gas in the space formed between the sealing plates 16 on the left and right sides of the suction cup 15 and the transmission belt 13 into a negative pressure through the suction pump 104, so that the lower surface of the light guide plate is tightly adsorbed, but there is a gap between it and the transmission belt 13. When the light guide plate moves to the position of the light-emitting mechanism 84, the light-emitting mechanism 84 will irradiate light into the interior of the light guide plate, and finally emit light from the upper surface to illuminate the lower surface of the detection mechanism 21. The detection mechanism 21 will judge the quality of the light guide plate according to the intensity of the light, thereby avoiding the problem that the lower surface of the light guide plate is blocked by the transmission mechanism during detection, thereby increasing the reflectivity and causing errors.

[0026] Working principle:

[0027] Before using the present invention, the rolled shading tape 75 is fixed to the middle of the rotating shaft 74, and one end is attached to the middle of the curved surface of the pressing wheel 76, and the pressing wheel 76 will clamp it;

[0028] The regulating motor 2 works, driving the transmission shaft 3 to rotate, the transmission shaft 3 drives the worm block 4 in the middle to rotate, the worm block 4 drives the worm wheel 5 to rotate, the worm wheel 5 will drive the threaded rod 6 to rotate, so that the front plate 7 and the rear plate 8 move toward the middle at the same time, when the distance between the clamping wheel 76 and the rubber wheel 83 is the width of the light guide plate being transported, the regulating motor 2 will stop working;

[0029] The driving motor 18 works, driving the driving wheel 19 to rotate, and the driving wheel 19 drives the transmission wheel 17 to rotate through the synchronous belt 20, and the transmission wheel 17 drives the transmission roller 11 on the right to rotate, thereby driving the transmission belt 13 to rotate, and the rotating transmission belt 13 also drives the transmission roller 11 on the left to rotate;

[0030] When the present invention is used, the light guide plate with the engraved dots and the reflective film on the back is placed above the multiple suction cups 15. When the space formed by the sealing plates 16 on the left and right sides of the suction cup 15 and the transmission belt 13 is connected to the installation cavity 103, the working suction pump 104 will extract the gas in the formed space through the suction pipe 105 and discharge it from the exhaust pipe 106 to form a negative pressure, so that the lower surface of the light guide plate is tightly adsorbed. When the sealing plate 16 on the left side of the suction cup 15 leaves the installation cavity 103, the space formed by the sealing plates 16 on the left and right sides of the suction cup 15 and the transmission belt 13 will maintain a negative pressure state, so that the light guide plate is in a state of being firmly adsorbed, but there is a gap between the light guide plate and the transmission belt 13. The light guide plate follows the transmission belt 13 to move to the right. When the light guide plate moves to the right side, the light guide plate moves to the right side. The clamping wheel 76 contacts the rubber wheel 83 and then contacts the clamping wheel 76. The clamping wheel 76 will adhere one end of the shading tape 75 to the front side of the light guide plate. The light guide plate continues to move to the right, which will drive the clamping wheel 76, the shading tape 75 and the rotating shaft 73 to rotate, and make the shading tape 75 fit tightly with the front side of the light guide plate. When the light guide plate moves a certain distance to the right and leaves the clamping wheel 76, the electromagnet 711 is quickly energized to push the two magnetic blocks 79 and the cutting tool 710 to quickly contact the moving shading tape 75 and cut it off. Then the electromagnet 711 is de-energized and the cutting tool 710 is reset. After being cut, the shading tape 75 is still in a state of being clamped by the clamping wheel 76. When the light guide plate is no longer in contact with the clamping wheel 76, the clamping wheel 76 will no longer rotate.

[0031] When the light guide plate moves to the position of the light emitting mechanism 84, the light emitting mechanism 84 will irradiate light into the interior of the light guide plate, and finally emit light from the upper surface to illuminate the lower surface of the detection mechanism 21. The detection mechanism 21 will judge the quality of the light guide plate according to the intensity of the light. When the right side sealing plate 16 of the suction cup 15 that adsorbs the light guide plate is located at the rightmost side of the sliding groove 102, air will enter the interior of the suction cup 15, so that the light guide plate is no longer adsorbed and can be easily removed.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A light guide plate processing device, comprising a mounting seat (1), an adjusting motor (2) being fixedly mounted above the mounting seat (1), an output shaft of the adjusting motor (2) being fixedly connected to a transmission shaft (3), characterized in that: A plurality of worm blocks (4) are fixedly connected to the middle of the transmission shaft (3); a worm wheel (5) is meshed above the worm block (4); a threaded rod (6) is fixedly connected to the middle of the worm wheel (5); a front side of the threaded rod (6) is threadedly connected to a front plate (7); a rear side of the threaded rod (6) is threadedly connected to a rear plate (8); an H bracket (9) is provided between two adjacent worm blocks (4); a suction mechanism (10) is fixedly connected to the inner sides of the upper ends of the two H brackets (9); transmission rollers (11) are provided at both left and right ends of the suction mechanism (10); the front and rear sides of the two transmission rollers (11) are rotatably connected to a support frame (12); the curved surfaces of the two transmission rollers (11) are A transmission belt (13) is connected for transmission, a plurality of conical holes (14) are formed on the inner curved surface of the transmission belt (13), a suction cup (15) is fixedly installed inside the conical hole (14), a plurality of sealing plates (16) are fixedly connected to the inner wall of the transmission belt (13), a transmission wheel (17) is fixedly connected to the front side of the transmission roller (11) on the right side, a driving motor (18) is fixedly connected to the right side of the support frame (12) on the right front side, a driving wheel (19) is fixedly connected to the output shaft of the driving motor (18), a synchronous belt (20) is connected for transmission between the driving wheel (19) and the transmission wheel (17), and a detection mechanism (21) is fixedly installed above the H bracket (9) in the middle.

2. A light guide plate processing device according to claim 1, characterized in that: The front plate (7) comprises a front limit plate (71), the front face of the front limit plate (71) is fixedly connected to a fixed plate (72), the upper surface of the fixed plate (72) is rotatably connected to a rotating shaft (73) and a rotating shaft (74), the upper end of the rotating shaft (73) is fixedly connected to a shading belt (75), the middle part of the rotating shaft (74) is fixedly connected to a clamping wheel (76), the upper surface of the fixed plate (72) is fixedly connected to a housing (77), the interior of the housing (77) is fixedly connected to two groups of springs (78), the other end of each group of springs (78) is fixedly connected to a magnetic block (79), a cutting tool (710) is fixedly connected between the two magnetic blocks (79), and an electromagnet (711) is provided on the side of the magnetic block (79) away from the spring (78).

3. A light guide plate processing device according to claim 2, characterized in that: The rear plate (8) comprises a rear limit plate (81), the upper end of the rear limit plate (81) is fixedly connected to a plurality of connecting rods (82), the lower ends of the connecting rods (82) are fixedly connected to rubber wheels (83), a light-emitting mechanism (84) is fixedly mounted on the front surface of the rear limit plate (81), and the left and right ends of the rear limit plate (81) are both slidably connected to two sliding rods (85).

4. The light guide plate processing device according to claim 3, characterized in that: The suction mechanism (10) comprises a rectangular block (101), the upper surface of the rectangular block (101) is provided with a sliding groove (102), the bottom center of the sliding groove (102) is connected to a mounting cavity (103), a suction pump (104) is fixedly mounted at the bottom of the mounting cavity (103), the upper surface of the suction pump (104) is fixedly connected to an air suction pipe (105), and the back surface of the suction pump (104) is fixedly connected to an air exhaust pipe (106).

5. The light guide plate processing device according to claim 4, characterized in that: The front and rear ends of the plurality of threaded rods (6) are rotatably connected to a connecting plate, the connecting plate is fixedly connected to the plurality of H brackets (9), the plurality of H brackets (9) are rotatably connected to the transmission shaft (3), and the two support frames (12) on the left are fixedly connected to the mounting seat (1).

6. The light guide plate processing device according to claim 5, characterized in that: The front limit plate (71) is threadedly connected to the threaded rod (6), the upper end of the rotating shaft (74) is rotatably connected to the front limit plate (71), the electromagnet (711) is fixedly connected to the housing (77), and the two magnetic blocks (79) are both slidably connected to the inside of the housing (77).

7. The light guide plate processing device according to claim 6, characterized in that: The front and rear ends of the sliding rod (85) are fixedly connected to the support frame (12), the sliding rod (85) is slidably connected to the front limit plate (71), and the middle parts of the rear limit plate (81) and the front limit plate (71) are adapted to the synchronous belt (20).

Images