Corrosion-resistant cable pay-off device

Abstract

The invention belongs to the technical field of pay-off devices, and discloses a corrosion-resistant cable pay-off device which comprises a base, two parallel fixing plates are fixed to the top of the base, and a winding roller used for winding a cable is rotationally installed between the two fixing plates. One side of the base is provided with a self-adaptive mechanism which is used for preventing the cable from being broken due to bending in the paying-off process, and the self-adaptive mechanism comprises a self-adaptive assembly; the self-adaptive assembly comprises a movable plate arranged on the base, a mounting plate rotationally mounted at the top of the movable plate, and a pulley block movably mounted on the mounting plate and used for a cable to pass through; the self-adaptive mechanism further comprises a driving assembly used for driving the movable plate to synchronously move along with the pulled part of the cable at the position in the axial direction of the winding roller. According to the invention, the probability that the cable is excessively bent, rubbed and even fractured in the pulling and laying process is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of wire-releasing devices, and in particular to a corrosion-resistant cable wire-releasing device. Background Art

[0002] There are three types of work in the cable laying project: wire reeling, wire releasing, and wire changing, i.e. wire reeling and wire releasing. Wire reeling generally adopts the whole pull-out method or the in-situ floor-standing method. Wire changing generally adopts the method of old wire and new wire. The reeling and wire releasing equipment is needed in the process of cable arrangement.

[0003] A Chinese utility model patent with publication number CN221700680U discloses a cable pay-off reel, comprising a control frame, the control frame is used for positioning control of the cable pay-off reel, an adjustment positioning mechanism is fixedly provided at the top of the control frame, and protective mechanisms are fixedly provided at both ends of the adjustment positioning mechanism; the adjustment positioning mechanism comprises a positioning frame, and a positioning gear is rotatably provided at the middle position of the positioning frame; the utility model positions the positioning gear connected to the middle position of the positioning frame by rotation, so that the positioning gear drives two positioning racks to engage and move respectively.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: when laying cables, during the cable pay-off process, since the cables are wound on different axial positions of the pay-off reel frame, during the process of pulling and laying the cables, the cables are easily pulled obliquely and bent, which may cause more serious wear of the cables during the bending process. Therefore, it is necessary to improve the design of the related technologies. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a corrosion-resistant cable pay-out device.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a corrosion-resistant cable pay-out device, comprising a base, two mutually parallel fixed plates are fixed on the top of the base, a winding roller for winding the cable is rotatably installed between the two fixed plates, and an adaptive mechanism is provided on one side of the base to prevent the cable from breaking due to bending during the pay-out process. The adaptive mechanism includes an adaptive component, which includes a movable plate arranged on the base, a mounting plate rotatably installed on the top of the movable plate, and a pulley group movably installed on the mounting plate for the cable to pass through. The adaptive mechanism also includes a driving component for driving the movable plate to move synchronously with the position of the pulled part of the cable on the axial direction of the winding roller.

[0007] By adopting the above technical solution, the driving component can drive the movable plate to move synchronously with the position of the pulled part of the cable on the axial direction of the winding roller. Since the mounting plate is rotatably installed on the top of the movable plate, and the pulley group on the mounting plate cooperates with the cable, the cable is flexibly turned, so that the cable can adapt to the pulling forces in different directions, reducing the probability of excessive bending, friction or even breakage of the cable during the pulling and laying process.

[0008] Furthermore, the mounting plate includes an upper plate body rotatably connected to the top of the movable plate and a lower plate body detachably connected to the top of the upper plate body, the bottom of the upper plate body and the top of the lower plate body are respectively provided with an upper mounting groove and a lower mounting groove, the pulley group includes a lower pulley rotatably mounted on the inner wall of the lower mounting groove and an upper pulley movably mounted at the corresponding position of the upper mounting groove and the lower pulley, and the side wall of the lower plate body is penetrated by a threading hole that is connected to the lower mounting groove and for the cable to pass through.

[0009] By adopting the above technical solution, the upper pulley and the lower pulley cooperate with each other, so that the cable that enters the installation plate through the threading hole is positioned by the upper pulley and the lower pulley, reducing the probability of damage to the cable during the pulling process.

[0010] Furthermore, a connecting groove connected to the upper mounting groove is provided through the side wall of the upper plate body, and two mounting blocks are provided on the upper plate body, which are respectively slidably matched with the connecting grooves on both sides, and the two ends of the upper pulley are respectively rotatably connected to the two mounting blocks, and a threaded shaft threadedly connected to the upper plate body is provided on the top of the upper plate body, and the lower end of the threaded shaft is rotatably connected to the top of one of the mounting blocks, and a star-shaped handle is fixed to the upper end of the threaded shaft.

[0011] By adopting the above technical solution, the position of the mounting block can be adjusted by rotating the threaded shaft using the threaded shaft, so that the position of the upper pulley can be adjusted. After the distance between the upper pulley and the lower pulley is adjusted to a position that matches the diameter of the cable, the threaded shaft is stopped from rotating so that the upper pulley and the lower pulley can cooperate and perform compression operations on cables of different diameters.

[0012] Furthermore, an upper block is fixed to the side wall of the upper plate, a lower block is fixed to the side wall of the lower plate, a bolt which is loosely matched with the upper block is penetrated through the upper block, and the lower end of the bolt is threadedly connected to the top of the lower block.

[0013] By adopting the above technical solution, it is convenient to assemble the pulley block in the mounting plate.

[0014] Furthermore, two parallel vertical plates are fixed on the top of the base, and the driving assembly includes a guide rod fixed between the two vertical plates, a threaded rod rotatably installed between the vertical plates, a driving motor fixed to one of the vertical plates and driving the threaded rod to rotate, and a position sensor arranged on the movable plate and used to monitor the axial position of the pulled part of the cable on the winding roller, the threaded rod passes through the movable plate and is threadedly connected, and the guide rod passes through the movable plate and is slidably fitted.

[0015] By adopting the above technical solution, the driving motor drives the threaded rod to rotate after working, so that the movable plate threadedly connected to the threaded rod moves along its axial direction, and the position sensor on the movable plate moves synchronously, so as to monitor the position of the pulled part of the cable on the axial direction of the winding roller, so that the staff can adjust the position of the movable plate, so that the upper pulley and the lower pulley cooperate and guide the cable well, reducing the probability of the cable breaking during the bending process.

[0016] Furthermore, the movable plate is provided with an adjustment component for driving the position of the position sensor to be adjusted along with the radial position of the pulled portion of the cable line on the winding roller, the adjustment component includes a connecting plate fixed on the side wall of the movable plate close to the fixed plate, a driving gear rotatably mounted on the connecting plate, an adjustment motor fixed on the connecting plate and driving the driving gear to rotate, a driven rod rotatably mounted on the connecting plate, and a placement plate fixedly sleeved on the driven rod, the surface of the placement plate away from the fixed plate is an arc surface, a locking tooth meshing with the driving gear is fixed on the arc surface of the placement plate, and the position sensor is fixed to the side of the placement plate close to the fixed plate.

[0017] By adopting the above technical solution, the adjustment motor can drive the driving gear to rotate after it is working, so that the clamping teeth meshing with the driving gear, the placement plate fixed to the clamping teeth, and the driven rod fixed to the placement plate are all rotated, so that the position of the position sensor can be adjusted, so that the position sensor can accurately detect the position of the cable after the cable is released.

[0018] Furthermore, a camera for monitoring the position of the pulled portion of the cable is fixed on the side wall of the movable plate close to the fixed plate.

[0019] By adopting the above technical solution, the camera can assist the position sensor to improve the accuracy of monitoring the position of the pulled part of the cable.

[0020] Furthermore, a rolling assembly for pressing the cable onto the winding roller is arranged between the two fixed plates, and the rolling assembly includes a pressing roller arranged between the two fixed plates, both ends of the pressing roller are rotatably connected to connecting rods, and a cross bar is fixed to the end of each connecting rod away from the pressing roller, and the ends of the two cross bars away from the connecting rods are respectively rotatably connected to the two fixed plates, and a torsion spring is sleeved on one of the cross bars, and both ends of the torsion spring are respectively fixed to the fixed plate and the connecting rod.

[0021] By adopting the above technical solution, the connecting rod and the clamping roller cooperate with the winding roller and clamp the cable under the torsion force of the torsion spring, so that the cable remains neat during the pay-off process and the probability of the cable becoming loose during the winding process is reduced.

[0022] In summary, the present invention has the following beneficial effects:

[0023] 1. In the present application, the driving assembly can drive the movable plate to move synchronously with the position of the pulled part of the cable in the axial direction of the winding roller. Since the mounting plate is rotatably mounted on the top of the movable plate, and the pulley block on the mounting plate cooperates with the cable, the cable is flexibly turned, so that the cable can adapt to the pulling forces in different directions, reducing the probability of excessive bending, friction or even breakage of the cable during the pulling and laying process;

[0024] 2. In the present application, the position of the mounting block can be adjusted by rotating the threaded shaft, so that the position of the upper pulley can be adjusted. After the distance between the upper pulley and the lower pulley is adjusted to a position matching the diameter of the cable, the threaded shaft is stopped from rotating, so that the upper pulley and the lower pulley can cooperate and perform a compression operation on cables of different diameters;

[0025] 3. In the present application, the driving motor drives the threaded rod to rotate after working, so that the movable plate threadedly connected to the threaded rod moves along its axial direction, and the position sensor on the movable plate moves synchronously, so as to monitor the position of the pulled part of the cable on the axial direction of the winding roller, so that the staff can adjust the position of the movable plate, so that the upper pulley and the lower pulley cooperate and guide the cable well, reducing the probability of the cable breaking during the bending process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 A schematic diagram of the structure from another perspective;

[0028] Figure 3 yes Figure 2 The enlarged schematic diagram of point A in the middle;

[0029] Figure 4 is a schematic diagram of an embodiment of the present invention for highlighting the lower plate and its connection structure;

[0030] Figure 5 is a schematic diagram of the structure of an embodiment of the present invention for highlighting a mounting plate;

[0031] Figure 6 yes Figure 1 The enlarged schematic diagram of point B in the middle;

[0032] Figure 7 yes Figure 1 Enlarged schematic diagram of point C in the middle.

[0033] In the figure: 1, base; 11, fixed plate; 12, vertical plate; 2, winding roller; 3, adaptive mechanism; 31, adaptive component; 311, movable plate; 3111, camera; 312, mounting plate; 3121, upper plate; 31211, upper mounting groove; 31212, connecting groove; 3122, lower plate; 31221, lower mounting groove; 31222, threading hole; 313, pulley block; 3131, lower pulley; 3132, upper pulley; 32, drive dynamic assembly; 321, guide rod; 322, threaded rod; 323, drive motor; 324, position sensor; 4, mounting block; 5, threaded shaft; 51, handle; 6, upper block; 61, bolt; 7, lower block; 8, adjustment assembly; 81, connecting plate; 82, driving gear; 83, adjustment motor; 84, driven rod; 85, placement plate; 851, latching teeth; 9, rolling assembly; 91, pressure roller; 92, connecting rod; 93, cross bar; 94, torsion spring. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0035] like Figure 1-7As shown, an embodiment of the present application discloses a corrosion-resistant cable pay-out device, comprising a base 1, two mutually parallel fixed plates 11 are fixed on the top of the base 1, a winding roller 2 for winding the cable is rotatably installed between the two fixed plates 11, an adaptive mechanism 3 for preventing the cable from breaking due to bending during the pay-out process is arranged on one side of the base 1, the adaptive mechanism 3 comprises an adaptive component 31, the adaptive component 31 comprises a movable plate 311 arranged on the base 1, a mounting plate 312 rotatably installed on the top of the movable plate 311 and a pulley group 313 movably installed on the mounting plate 312 and for the cable to pass through, the adaptive mechanism 3 also comprises a driving component 32 for driving the movable plate 311 to move synchronously with the axial position of the pulled part of the cable on the winding roller 2.

[0036] The driving assembly 32 can drive the movable plate 311 to move synchronously with the axial position of the pulled part of the cable on the winding roller 2. Since the mounting plate 312 is rotatably installed on the top of the movable plate 311, and the pulley group 313 on the mounting plate 312 cooperates with the cable, the cable is flexibly turned, so that the cable can adapt to the pulling forces in different directions, reducing the probability of excessive bending, friction or even breakage of the cable during the pulling and laying process.

[0037] The mounting plate 312 comprises an upper plate body 3121 rotatably connected to the top of the movable plate 311 and a lower plate body 3122 detachably connected to the top of the upper plate body 3121. An upper mounting groove 31211 and a lower mounting groove 31221 are respectively provided at the bottom of the upper plate body 3121 and the top of the lower plate body 3122. The pulley block 313 comprises a lower pulley 3131 rotatably mounted on the inner wall of the lower mounting groove 31221 and an upper pulley 3132 movably mounted at positions corresponding to the upper mounting groove 31211 and the lower pulley 3131. A threading hole 31222 which is connected to the lower mounting groove 31221 and is used for cables to pass through is penetrated through the side wall of the lower plate body 3122.

[0038] The upper pulley 3132 cooperates with the lower pulley 3131 so that the cable entering the mounting plate 312 from the threading hole 31222 is positioned by the upper pulley 3132 and the lower pulley 3131, reducing the probability of damage to the cable during the pulling process.

[0039] A connecting groove 31212 connected to the upper mounting groove 31211 is penetrated through the side wall of the upper plate body 3121, and two mounting blocks 4 are provided on the upper plate body 3121, which are respectively slidably matched with the connecting grooves 31212 on both sides, and the two ends of the upper pulley 3132 are rotatably connected to the two mounting blocks 4 respectively. A threaded shaft 5 threadedly connected to the upper plate body 3121 is provided on the top of the upper plate body 3121, and the lower end of the threaded shaft 5 is rotatably connected to the top of one of the mounting blocks 4, and a star-shaped handle 51 is fixed to the upper end of the threaded shaft 5.

[0040] By rotating the threaded shaft 5 using the threaded shaft 5, the position of the mounting block 4 can be adjusted, so that the position of the upper pulley 3132 can be adjusted. After the distance between the upper pulley 3132 and the lower pulley 3131 is adjusted to a position that matches the diameter of the cable, the threaded shaft 5 is stopped from rotating so that the upper pulley 3132 and the lower pulley 3131 can cooperate and perform a compression operation on cables of different diameters.

[0041] To facilitate the assembly of the pulley assembly 313 in the mounting plate 312, an upper block 6 is fixed to the side wall of the upper plate 3121, and a lower block 7 is fixed to the side wall of the lower plate 3122. A bolt 61 is provided through the upper block 6 to fit the clearance of the upper block 6, and the lower end of the bolt 61 is threadedly connected to the top of the lower block 7.

[0042] Two parallel vertical plates 12 are fixed on the top of the base 1, and the driving assembly 32 includes a guide rod 321 fixed between the two vertical plates 12, a threaded rod 322 rotatably installed between the vertical plates 12, a driving motor 323 fixed on one of the vertical plates 12 and driving the threaded rod 322 to rotate, and a position sensor 324 arranged on the movable plate 311 and used to monitor the axial position of the pulled part of the cable on the winding roller 2. The threaded rod 322 penetrates the movable plate 311 and is threadedly connected, and the guide rod 321 penetrates the movable plate 311 and is slidably fitted.

[0043] After the driving motor 323 works, it drives the threaded rod 322 to rotate, so that the movable plate 311 threadedly connected to the threaded rod 322 moves along its axial direction, and the position sensor 324 on the movable plate 311 moves synchronously, which can monitor the position of the pulled part of the cable in the axial direction of the winding roller 2, so that the staff can adjust the position of the movable plate 311, so that the upper pulley 3132 and the lower pulley 3131 cooperate and guide the cable well, reducing the probability of the cable breaking during the bending process. In other embodiments, in order to improve the intelligence of the device, a controller electrically connected to the position sensor 324 and the driving motor 323 can be fixed on the base 1, and the position sensor 324 transmits the monitored information to the controller in the form of an electrical signal, so that the controller controls the operation of the driving motor 323 according to the information.

[0044] The movable plate 311 is provided with an adjustment component 8 for driving the position of the position sensor 324 to be adjusted along with the radial position of the pulled part of the cable line on the winding roller 2. The adjustment component 8 includes a connecting plate 81 fixed on the side wall of the movable plate 311 close to the fixed plate 11, a driving gear 82 rotatably mounted on the connecting plate 81, an adjustment motor 83 fixed on the connecting plate 81 and driving the driving gear 82 to rotate, a driven rod 84 rotatably mounted on the connecting plate 81, and a placement plate 85 fixedly sleeved on the driven rod 84. The surface of the placement plate 85 away from the fixed plate 11 is an arc surface. A latch tooth 851 meshing with the driving gear 82 is fixed on the arc surface of the placement plate 85. The position sensor 324 is fixed to the side of the placement plate 85 close to the fixed plate 11.

[0045] After the adjustment motor 83 is working, it can drive the driving gear 82 to rotate, so that the tooth 851 meshing with the driving gear 82, the placement plate 85 fixed to the tooth 851, and the driven rod 84 fixed to the placement plate 85 all rotate, so that the position of the position sensor 324 can be adjusted, so that the position sensor 324 can accurately detect the position of the cable after the cable is paid out (after the cable is paid out for a period of time, the thickness of the cable in the radial direction of the winding roller 2 decreases, and the angle of the position sensor 324 needs to be changed to continue to monitor the pulled part of the cable).

[0046] In order to improve the accuracy of the monitoring result of the pulled portion of the cable, a camera 3111 for monitoring the position of the pulled portion of the cable is fixed on the side wall of the movable plate 311 close to the fixed plate 11.

[0047] A rolling assembly 9 for pressing the cable onto the winding roller 2 is arranged between the two fixed plates 11. The rolling assembly 9 includes a pressing roller 91 arranged between the two fixed plates 11. Both ends of the pressing roller 91 are rotatably connected to connecting rods 92. A cross bar 93 is fixed to the end of each connecting rod 92 away from the pressing roller 91. The ends of the two cross bars 93 away from the connecting rods 92 are respectively rotatably connected to the two fixed plates 11. A torsion spring 94 is sleeved on one of the cross bars 93, and both ends of the torsion spring 94 are respectively fixed to the fixed plate 11 and the connecting rod 92.

[0048] Under the torsion force of the torsion spring 94, the connecting rod 92 and the clamping roller 91 cooperate with the winding roller 2 and clamp the cable, so that the cable remains neat during the unwinding process and the probability of the cable becoming loose during the winding process is reduced.

[0049] The operating principle of a corrosion-resistant cable unwinding device in the present embodiment is as follows: the driving component 32 can drive the movable plate 311 to move synchronously with the axial position of the pulled part of the cable line on the winding roller 2. Since the mounting plate 312 is rotatably installed on the top of the movable plate 311, and the pulley group 313 on the mounting plate 312 cooperates with the cable line, the cable line is flexibly turned, so that the cable line can adapt to the pulling force in different directions, reducing the probability of excessive bending, friction or even breakage of the cable line during the pulling and laying process.

[0050] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A corrosion-resistant cable pay-off device, comprising a base (1), wherein two mutually parallel fixing plates (11) are fixed on the top of the base (1), and a winding roller (2) for winding a cable is rotatably mounted between the two fixing plates (11), wherein: An adaptive mechanism (3) for preventing the cable from breaking due to bending during the unwinding process is arranged on one side of the base (1); the adaptive mechanism (3) comprises an adaptive component (31); the adaptive component (31) comprises a movable plate (311) arranged on the base (1); a mounting plate (312) rotatably mounted on the top of the movable plate (311); and a pulley block (313) movably mounted on the mounting plate (312) and for the cable to pass through; the adaptive mechanism (3) further comprises a driving component (32) for driving the movable plate (311) to move synchronously with the position of the pulled portion of the cable on the axial direction of the winding roller (2).

2. The corrosion-resistant cable pay-off device according to claim 1 is characterized in that: The mounting plate (312) comprises an upper plate body (3121) rotatably connected to the top of the movable plate (311) and a lower plate body (3122) detachably connected to the top of the upper plate body (3121); an upper mounting groove (31211) and a lower mounting groove (31221) are respectively provided at the bottom of the upper plate body (3121) and the top of the lower plate body (3122); the pulley block (313) comprises a lower pulley (3131) rotatably mounted on the inner wall of the lower mounting groove (31221) and an upper pulley (3132) movably mounted at positions corresponding to the upper mounting groove (31211) and the lower pulley (3131); a threading hole (31222) communicating with the lower mounting groove (31221) and allowing a cable to pass through is provided through the side wall of the lower plate body (3122).

3. The corrosion-resistant cable pay-off device according to claim 2, characterized in that: The side wall of the upper plate body (3121) is penetrated by a connecting groove (31212) connected to the upper mounting groove (31211); the upper plate body (3121) is provided with two mounting blocks (4) which are respectively slidably matched with the connecting grooves (31212) on both sides; the two ends of the upper pulley (3132) are respectively rotatably connected to the two mounting blocks (4); the top of the upper plate body (3121) is provided with a threaded shaft (5) which is threadedly connected to the upper plate body (3121); the lower end of the threaded shaft (5) is rotatably connected to the top of one of the mounting blocks (4); and the upper end of the threaded shaft (5) is fixed with a star-shaped handle (51).

4. The corrosion-resistant cable pay-off device according to claim 2, characterized in that: An upper block (6) is fixed to the side wall of the upper plate (3121), and a lower block (7) is fixed to the side wall of the lower plate (3122). A bolt (61) is provided through the upper block (6) and is loosely matched with the upper block (6). The lower end of the bolt (61) is threadedly connected to the top of the lower block (7).

5. The corrosion-resistant cable pay-off device according to claim 2, characterized in that: Two parallel vertical plates (12) are fixed on the top of the base (1); the driving assembly (32) comprises a guide rod (321) fixed between the two vertical plates (12), a threaded rod (322) rotatably mounted between the vertical plates (12), a driving motor (323) fixed on one of the vertical plates (12) and driving the threaded rod (322) to rotate, and a position sensor (324) arranged on the movable plate (311) and used to monitor the axial position of the pulled portion of the cable on the winding roller (2); the threaded rod (322) penetrates the movable plate (311) and is threadedly connected; and the guide rod (321) penetrates the movable plate (311) and is slidably fitted.

6. The corrosion-resistant cable pay-off device according to claim 5, characterized in that: The movable plate (311) is provided with an adjustment assembly (8) for driving the position of the position sensor (324) to be adjusted along with the radial position of the pulled portion of the cable on the winding roller (2). The adjustment assembly (8) comprises a connecting plate (81) fixed on the side wall of the movable plate (311) close to the fixed plate (11), a driving gear (82) rotatably mounted on the connecting plate (81), an adjustment motor (83) fixed on the connecting plate (81) and driving the driving gear (82) to rotate, a driven rod (84) rotatably mounted on the connecting plate (81), and a placement plate (85) fixedly sleeved on the driven rod (84), wherein the surface of the placement plate (85) away from the fixed plate (11) is an arc surface, and a latching tooth (851) meshing with the driving gear (82) is fixed on the arc surface of the placement plate (85), and the position sensor (324) is fixed on the side of the placement plate (85) close to the fixed plate (11).

7. The corrosion-resistant cable pay-off device according to claim 6 is characterized in that: A camera (3111) for monitoring the position of the pulled portion of the cable is fixed on the side wall of the movable plate (311) close to the fixed plate (11).

8. The corrosion-resistant cable pay-off device according to claim 6, characterized in that: A rolling assembly (9) for pressing the cable onto the winding roller (2) is arranged between the two fixed plates (11), and the rolling assembly (9) comprises a pressing roller (91) arranged between the two fixed plates (11), both ends of the pressing roller (91) are rotatably connected to connecting rods (92), and each connecting rod (92) is fixed with a cross rod (93) at one end away from the pressing roller (91), and the ends of the two cross rods (93) away from the connecting rods (92) are rotatably connected to the two fixed plates (11), respectively, and one of the cross rods (93) is provided with a torsion spring (94), and the two ends of the torsion spring (94) are respectively fixed to the fixed plate (11) and the connecting rod (92).

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