Automatic packaging machine for light pipes

Abstract

This utility model relates to an automatic film-coating machine for lightweight pipes, including a film-supporting mechanism. During the entire film-coating process, a mechanical interlocking structure is formed because the vertical rollers are embedded in the limiting area of ​​the sleeve. This structure effectively prevents the sleeve from lateral displacement, jumping, or even detachment due to force on the film-feeding channel, ensuring the stability of the film-feeding channel. By precisely embedding the vertical rollers on the support into the limiting area of ​​the sleeve, rigid constraints on the sleeve in multiple directions in the horizontal plane are achieved. This design effectively resists the lateral and torsional forces generated during high-speed film pulling, fundamentally preventing lateral displacement, overturning, or even detachment of the sleeve from the film-feeding channel, ensuring continuous alignment and stability of the film-feeding channel, and avoiding problems such as film twisting, wrinkling, or tearing caused by sleeve displacement.

Description

Technical Field

[0001] This utility model relates to the field of long tube bagging technology, specifically to an automatic bagging machine for lightweight tubes. Background Technology

[0002] In the field of long tube bagging technology, commonly used in industry, agriculture, and packaging, it is often necessary to protect the outer surface of tubular materials with bags to achieve purposes such as dustproofing, moisture protection, scratch protection, or marking. In the field of automated packaging of long tube products, the bagging process is a key step in ensuring product protection and transportation safety. In existing technologies, long tube bagging operations are usually completed with manual assistance or semi-automatic equipment, and the core issue lies in the stability of the film during the bagging process. Traditional bagging machines typically use a single guide wheel structure to achieve film conveying, but in actual operation, the following technical defects exist: the sleeve on the film feeding channel is only positioned by the bottom support structure, which is prone to lateral displacement during high-speed film pulling operations, causing deformation of the bag opening or even detachment from the film feeding channel. Utility Model Content

[0003] The main purpose of this utility model is to provide an automatic sleeve machine for lightweight pipes, so as to solve the problem that the sleeve on the film feeding channel is only positioned by the bottom support structure in the existing technology, which is prone to lateral displacement during high-speed film pulling operation, resulting in deformation of the sleeve opening or even separation from the film feeding channel.

[0004] To achieve the above objectives, this utility model provides an automatic packaging machine for lightweight pipes, including a film-supporting mechanism; The film support mechanism includes a support frame and a sleeve. The support frame has a film feeding channel, and two base frames are set on both sides of the film feeding channel. Two vertical rollers are rotated on each base frame along the length of the film feeding channel. Two first V-shaped wheels are rotated at the bottom of the support along the length of the film feeding channel; The sleeve is placed on the film feeding channel and abuts against two first V-shaped wheels. A through groove perpendicular to its axis is opened through the sleeve, and two limiting rollers are installed. One side of the through groove and one limiting roller form a limiting area. The two limiting areas are symmetrically arranged on both sides of the sleeve and correspond one-to-one with the two vertical rollers. The vertical rollers are embedded in the limiting areas.

[0005] Preferably, two base frames are movable on both sides of the film feeding channel, and the two base frames are connected to a drive component for driving both to move synchronously closer to or away from the sleeve; The driving components include a lead screw and a hand-rolling wheel. The lead screw is mounted on the support along the width of the film feeding channel. The lead screw has a left helical section and a right helical section. Two base frames are respectively screwed onto the left helical section and the right helical section. The hand-rolling wheel is fixedly mounted on the lead screw.

[0006] Preferably, the automatic packing machine for lightweight pipes also includes a frame and a mobile cart. Multiple membrane support mechanisms are fixed on one side of the frame along its width direction, and a bagging area is located in the middle of the frame along its length direction. Multiple lifting mechanisms for supporting long pipes are evenly distributed below the bagging area along its length. Two rails are fixed along the length of the frame. The two parallel rails are symmetrically arranged on both sides of the bagging area. The mobile vehicle moves and is mounted on the two rails. Multiple grippers for gripping the film are fixedly arranged on the mobile vehicle along the width of the frame.

[0007] Preferably, the lifting mechanism includes a frame and at least one first cylinder. The cylinder seat of the first cylinder is fixedly connected to the frame, and the vertically arranged piston rod is fixed to the lifting plate. Multiple roller seats are arranged and fixed along the width direction of the frame on the lifting plate. A second V-shaped wheel is horizontally mounted on each roller seat. The groove of the second V-shaped wheel is used to place a long tube.

[0008] Preferably, the gripper includes a mounting base, a Z-shaped plate, and a second cylinder, with two Z-shaped plates and two second cylinders; The mounting base is fixedly connected to the mobile vehicle and has a pin. The cylinder seats of both second cylinders are fixedly connected to the mounting base and correspond one-to-one with the two Z-shaped plates; The piston rod of the second cylinder is fixedly connected to the top of the Z-shaped plate, and horizontal grooves are opened horizontally in the middle of each Z-shaped plate. Two Z-shaped plates are stacked together so that the pin is inserted into the two transverse slots; An arc-shaped plate is fixedly installed at the bottom of each Z-shaped plate; Among them, two second cylinders are driven to make the two arc-shaped plates move closer or further apart.

[0009] Preferably, the automatic packaging machine for lightweight pipes also includes a film winding mechanism, which is located upstream of the film supporting mechanism; The film winding mechanism includes a support frame, on which multiple shafts for the film rollers to pass through are horizontally fixed.

[0010] Preferably, the automatic packaging machine for lightweight pipes also includes a film-cutting mechanism; The film cutting mechanism includes a cylinder seat of a rodless cylinder that is fixedly connected to the frame, and a hot cutting wire seat is fixedly installed on the slide, with a heating wire installed on the hot cutting wire seat; The heating wire can move through the downstream of multiple membrane support mechanisms and along the width of the frame.

[0011] Preferably, the automatic pipe-mounting machine for lightweight pipes also includes a pipe-jacking mechanism, which is located at the end of the frame away from the membrane-supporting mechanism, and includes a third cylinder and multiple jacking rods; The cylinder seat of the third cylinder is fixedly connected to the frame, and the piston rod extends and retracts along the length of the frame. A transverse plate is fixed on the piston rod of the third cylinder, and multiple push rods are evenly distributed and fixed on the transverse plate along the width of the frame and arranged along the length of the frame.

[0012] The beneficial effects of the above scheme are: The operator guides the rolled film (usually a tubular plastic film) to the film-stretching mechanism, passing the open end of the film through the sleeve. Two limiting rollers are located inside and in contact with the film. The bottom of the sleeve is supported and positioned by two first V-shaped wheels at the bottom of the support. Vertical rollers on the base frame on both sides of the film feeding channel naturally embed into the limiting areas formed by the through grooves and limiting rollers on both sides of the sleeve. The vertical rollers are located on the outside of the film. The film is effectively stretched and fixed in its working path. Under the action of pulling force, the film moves relative to the sleeve and support. The inner wall of the film rolls against the limiting rollers on the sleeve, and the outer wall rolls against the vertical rollers on the support. This rolling friction method greatly reduces the film feeding resistance, ensures a smooth film feeding process, and is less likely to scratch the film. Throughout the film stretching process, the vertical rollers embedded in the limiting areas of the sleeve form a mechanical interlocking structure. This structure effectively prevents the sleeve from shifting laterally, jumping, or even detaching due to force in the film delivery channel, ensuring the stability of the delivery channel. By precisely embedding the vertical rollers on the support into the limiting area of ​​the sleeve (formed by the through groove and the limiting rollers), rigid constraints on the sleeve in multiple directions in the horizontal plane are achieved. This design effectively resists the lateral and torsional forces generated during high-speed pulling of the film, fundamentally preventing the sleeve from shifting laterally, overturning, or even detaching from the film delivery channel, ensuring the continuous alignment and stability of the film delivery channel, and avoiding problems such as film twisting, wrinkling, or tearing caused by sleeve displacement. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a front view structural diagram of the present invention; Figure 3 This is a three-dimensional structural diagram of the membrane support mechanism of this utility model; Figure 4 This is a top view of the membrane support mechanism of this utility model; Figure 5 This is a cross-sectional structural diagram of the membrane support mechanism of this utility model; Figure 6 This is a three-dimensional structural diagram of the lifting mechanism of this utility model; Figure 7This is a three-dimensional structural diagram of the gripper of this utility model; Figure 8 This is a three-dimensional structural diagram of the membrane-breaking mechanism of this utility model.

[0015] Explanation of reference numerals in the attached figures 1. Film support mechanism; 11. Support; 12. Sleeve; 13. Film feeding channel; 14. Base frame; 15. Vertical roller; 16. First V-shaped wheel; 120. Through groove; 121. Limiting roller; 100. Limiting area; 17. Drive component; 171. Lead screw; 172. Hand-operated wheel.

[0016] 2. Frame; 21. Mobile vehicle; 22. Bagging area; 23. Rails; 3. Lifting mechanism; 31. Frame; 32. First cylinder; 33. Lifting plate; 34. Roller seat; 35. Second V-shaped wheel; 4. Handle; 41. Mounting base; 42. Z-shaped plate; 43. Second cylinder; 44. Pin; 420. Transverse groove; 45. Arc-shaped plate; 5. Film winding mechanism; 51. Support frame; 52. Film roller; 53. Shaft; 6. Film cutting mechanism; 61. Rodless cylinder; 62. Hot cutting wire holder; 63. Heating wire; 7. Pipe jacking mechanism; 71. Third cylinder; 72. Jacking rod; 73. Horizontal plate; 8. Long tube. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. Example

[0018] like Figures 3-5As shown, this embodiment provides an automatic packaging machine for lightweight pipes, including a film-supporting mechanism 1. The film-supporting mechanism 1 includes a support 11 and a sleeve 12. The support 11 has a film feeding channel 13, and two base frames 14 are movably arranged on both sides of the film feeding channel 13. Two vertical rollers 15 are rotated on each base frame 14 along the length direction of the film feeding channel 13. Two first V-shaped wheels 16 are rotated at the bottom end of the support 11 along the length direction of the film feeding channel 13. The sleeve 12 is placed on the film feeding channel 13 and abuts against the two first V-shaped wheels 16. A through groove 120 perpendicular to its axial direction is opened through the sleeve 12, and two limiting rollers 121 are rotated on the sleeve 12. The two limiting rollers 121 are located in the through groove 120, such as... Figure 4 As shown, one side of the through groove 120 forms a limiting area 100 with a limiting roller 121. Two limiting areas 100 are symmetrically arranged on both sides of the sleeve 12, and each limiting area 100 corresponds to one of two vertical rollers 15, which are embedded within the limiting area 100. Two base frames 14 are movably arranged on both sides of the film feeding channel 13. The two base frames 14 are connected to a driving member 17 for synchronously moving the film feeding channel and the sleeve 12 closer to or further away from the sleeve 12. Figure 5 As shown, the drive component 17 includes a lead screw 171 and a hand-rolling wheel 172. The lead screw 171 is mounted on the bracket 11 along the width direction of the film feeding channel 13. The lead screw 171 has a left-hand spiral section (not shown) and a right-hand spiral section (not shown). Two base frames 14 are respectively screwed onto the left-hand spiral section and the right-hand spiral section. The hand-rolling wheel 172 is fixedly mounted on the lead screw 171. The drive component 17, which is used to drive both of them to move synchronously closer to or away from the sleeve 12, is connected by the two base frames 14. Rotating the hand-rolling wheel 172 causes the lead screw 171 to rotate. The two base frames 14 are respectively screwed onto the left-hand spiral section and the right-hand spiral section. The two base frames 14 move synchronously closer to or away from the sleeve 12. This can accommodate sleeves 12 of different diameters, thereby realizing the bag-supporting process for sleeves of different diameters.

[0019] The operator guides the rolled film (usually a tubular plastic film) to the film-supporting mechanism 1, passing one open end of the film through the sleeve 12. Two limiting rollers 121 are located inside and in contact with the film. The bottom of the sleeve 12 is supported and positioned by two first V-shaped wheels 16 at the bottom of the bracket 11. The vertical rollers 15 on the base frames 14 on both sides of the film feeding channel 13 naturally embed into the limiting areas 100 formed by the through grooves 120 and the limiting rollers 121 on both sides of the sleeve 12. The vertical rollers 15 are located outside the film. The film is effectively stretched and fixed on its working path. Under the action of pulling force, the film moves relative to the sleeve 12 and the bracket 11. The inner wall of the film rolls against the limiting rollers 121 on the sleeve 12, and the outer wall rolls against the vertical rollers 15 on the bracket 11. This rolling friction method greatly reduces the film feeding resistance, ensures a smooth film feeding process, and is less likely to scratch the film. Throughout the membrane stretching process, the vertical roller 15 is embedded within the limiting area 100 of the sleeve 12, forming a mechanical interlocking structure. This structure effectively prevents the sleeve 12 from shifting laterally, jumping, or even detaching due to force on the film delivery channel 13, ensuring the stability of the film delivery channel 13. By precisely embedding the vertical roller 15 on the support 11 into the limiting area 100 of the sleeve 12 (formed by the through groove 120 and the limiting roller 121), rigid constraints on the sleeve 12 in multiple directions in the horizontal plane are achieved. This design effectively resists the lateral force and torsion generated during high-speed stretching of the film, fundamentally preventing the sleeve 12 from shifting laterally, overturning, or even detaching from the film delivery channel 13, ensuring the continuous alignment and stability of the film delivery channel 13, and avoiding problems such as film twisting, wrinkling, or tearing caused by sleeve 12 displacement.

[0020] like Figure 1 , Figure 2 As shown, the automatic assembly machine for lightweight pipes also includes a frame 2 and a moving cart 21. The moving cart in this utility model adopts existing technology, so it will not be described in detail. Please refer to the patent announcement number: CN223046558U - Chinese Utility Model Patent: A mobile vehicle traveling mechanism. Multiple membrane support mechanisms 1 are fixed along the width of one side of the frame 2. A bagging area 22 is located in the middle of the frame 2 along its length. Multiple lifting mechanisms 3 for supporting long tubes 8 are evenly distributed below the bagging area 22 along its length. (Example...) Figure 6 As shown, the lifting mechanism 3 includes a frame 31 and at least one first cylinder 32. The cylinder seat of the first cylinder 32 is fixedly connected to the frame 31, and the vertically arranged piston rod is fixed to the lifting plate 33. Multiple roller seats 34 are arranged and fixed along the width direction of the frame 2 on the lifting plate 33. A second V-shaped wheel 35 is horizontally mounted on each roller seat 34. The groove of the second V-shaped wheel 35 is used to place the long tube 8.

[0021] like Figure 1 , Figure 2 As shown, two rails 23 are fixed along the length of the frame 2. These two parallel rails 23 are symmetrically arranged on both sides of the bagging area 22. A mobile cart 21 is mounted on these two rails 23. Multiple grippers 4 for gripping the film are fixedly arranged on the mobile cart 21 along the width of the frame 2. Figure 7 As shown, the gripper 4 includes a mounting base 41, a Z-shaped plate 42, and two cylinders 43. There are two Z-shaped plates 42 and two cylinders 43. The mounting base 41 is fixedly connected to the moving vehicle 21 and has a pin 44. The cylinder seats of the two second cylinders 43 are fixedly connected to the mounting base 41 and correspond one-to-one with the two Z-shaped plates 42. The piston rod of the second cylinder 43 is fixedly connected to the top of the Z-shaped plate 42. A horizontal groove 420 is horizontally formed in the middle of each Z-shaped plate 42. The two Z-shaped plates 42 are stacked, so that the pins 44 are inserted into the two horizontal grooves 420. An arc-shaped plate 45 is fixedly installed at the bottom of each Z-shaped plate 42. Driving the two second cylinders 43 causes the two arc-shaped plates 45 to move closer or further apart.

[0022] like Figure 1 , Figure 2 As shown, the automatic packaging machine for lightweight pipes also includes a film winding mechanism 5, which is located upstream of the film supporting mechanism 1. The film winding mechanism 5 includes a support frame 51, on which multiple shafts 53 for the film rollers 52 to pass through are horizontally fixed.

[0023] like Figure 8 As shown, the automatic tubing setter also includes a film-cutting mechanism 6. The film-cutting mechanism 6 includes a rodless cylinder 61 whose cylinder seat is fixedly connected to the frame 2, and a hot-cutting wire seat 62 is fixedly mounted on the slide, with a heating wire 63 mounted on the hot-cutting wire seat 62. The heating wire 63 can move through the downstream of multiple film-supporting mechanisms 1 and along the width direction of the frame 2.

[0024] like Figure 1 As shown, the automatic pipe mounting machine also includes a pipe jacking mechanism 7, which is located at the end of the frame 2 away from the membrane support mechanism 1, and includes a third cylinder 71 and multiple jacking rods 72. The cylinder seat of the third cylinder 71 is fixedly connected to the frame 2, and the piston rod extends and retracts along the length of the frame 2. A transverse plate 73 is fixed on the piston rod of the third cylinder 71, and multiple jacking rods 72 are evenly distributed and fixed on the transverse plate 73 along the width of the frame 2, and arranged along the length of the frame 2.

[0025] like Figures 1-8As shown, the workflow of this embodiment is as follows: The operator installs the rolled film onto the support frame 51 shaft 53 of the film winding mechanism 5, ensuring that the film roll can rotate freely. The end of the film is led out from the film winding mechanism 5, passes through the film feeding channel 13 of the film supporting mechanism 1, and passes through the sleeve 12. At this time, the sleeve 12 is positioned by the bottom first V-shaped wheel 16, the inner wall of the film contacts the limiting roller 121 on the sleeve 12, and the outer wall contacts the vertical roller 15 on the base frame 14, forming a stable rolling support structure. According to the diameter of the tube to be sleeved, the hand-rolling wheel 172 drives the lead screw 171 to rotate, and drives the two base frames 14 on both sides to move closer to or away from the sleeve 12 through the left or right helical section, adjusting the fitting gap between the vertical roller 15 and the limiting area 100 of the sleeve 12 to ensure that the sleeve 12 is precisely constrained. The bottom of the sleeve 12 is radially positioned by the V-groove of the first V-shaped wheel 16 to prevent it from moving laterally. Vertical rollers 15 are embedded in the limiting areas 100 on both sides of the sleeve 12, forming a double mechanical interlock in both the axial and lateral directions to ensure the stability of the sleeve 12 during the film stretching process. The end of the film is pulled, and the film moves axially along the film delivery channel 13. The inner wall of the film rolls against the limiting rollers 121 of the sleeve 12, reducing resistance and preventing wrinkles. The outer wall of the film contacts the vertical rollers 15 of the base frame 14, maintaining the opening expansion state through rolling friction. The interlocking structure of the vertical rollers 15 and the limiting areas 100 resists the lateral force generated by film stretching, preventing the sleeve 12 from shifting or detaching. The pipe to be covered is transported to the bagging area 22 of the frame 2 by existing conveying equipment and placed on the lifting plate 33 of the lifting mechanism 3. The first cylinder 32 drives the lifting plate 33 to rise, and the second V-shaped wheel 35 lifts the long pipe 8 to the bagging height. The groove of the second V-shaped wheel 35 ensures the axial positioning of the long pipe 8 and prevents rolling. The mobile carriage 21 moves along the rail 23 of the frame 2 to above the bagging area 22. The second cylinder 43 of the gripper 4 drives the Z-shaped plate 42 to move downward, so that the arc plate 45 is close to both sides of the film. The piston rod of the second cylinder 43 extends, causing the two Z-shaped plates 42 to slide along the pin 44, so that the two arc plates 45 support the opening end of the film. The mobile carriage 21 moves along the length of the frame 2, pulling the film to cover the end of the long tube 8. At the same time, the film is kept taut by the continuous conveying of the film supporting mechanism 1. When the film completely covers the long tube 8, the hot cutting wire seat 62 of the film cutting mechanism 6 moves along the width of the frame 2 under the drive of the rodless cylinder 61. The heating wire 63 cuts the film to form an independent packaging unit. The third cylinder 71 of the tube-topping mechanism 7 drives the top rod 72 to extend, pushing the bagged long tube 8 out from the end of the frame 2 and into the next process.

[0026] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A lightweight and practical automatic packaging machine, characterized in that, Including membrane support mechanisms; The film support mechanism includes a support and a sleeve. The support has a film feeding channel. Two base frames are provided on both sides of the film feeding channel. Two vertical rollers are rotated on each base frame along the length of the film feeding channel. Two first V-shaped wheels are rotated at the bottom of the bracket along the length of the film delivery channel; The sleeve is placed on the film feeding channel and abuts against the two first V-shaped wheels. The sleeve has a through groove perpendicular to its axial direction and two limiting rollers are provided. One side of the through groove and one of the limiting rollers form a limiting area. The two limiting areas are symmetrically arranged on both sides of the sleeve and correspond one-to-one with the two vertical rollers. The vertical rollers are embedded in the limiting areas.

2. The automatic packaging machine for lightweight pipes according to claim 1, characterized in that, Two base frames are movable on both sides of the film feeding channel, and the two base frames are connected to a driving component for driving both to move synchronously closer to or away from the sleeve. The driving component includes a lead screw and a hand-rolling wheel. The lead screw is rotated on the bracket along the width direction of the film feeding channel. The lead screw has a left helical section and a right helical section. The two base frames are respectively screwed onto the left helical section and the right helical section. The hand-rolling wheel is fixedly sleeved on the lead screw.

3. The automatic packaging machine for lightweight pipes according to claim 1 or 2, characterized in that, It also includes a frame and a mobile vehicle. Multiple membrane support mechanisms are fixed on one side of the frame along its width direction. The middle part of the frame has a bagging area along its length direction. Multiple lifting mechanisms for supporting long tubes are evenly distributed below the bagging area along its length. The frame is fixed with two rails along its length. The two parallel rails are symmetrically arranged on both sides of the bagging area. The mobile vehicle is mounted on the two rails. Multiple grippers for gripping the film are fixedly arranged on the mobile vehicle along the width direction of the frame.

4. The automatic packaging machine for lightweight pipes according to claim 3, characterized in that, The lifting mechanism includes a frame and at least one first cylinder. The cylinder seat of the first cylinder is fixedly connected to the frame, and the vertically arranged piston rod is fixed to the lifting plate. Multiple roller seats are arranged and fixed along the width direction of the frame on the lifting plate. A second V-shaped wheel is horizontally rotated on each roller seat. The groove of the second V-shaped wheel is used to place the long tube.

5. The automatic packaging machine for lightweight pipes according to claim 3, characterized in that, The gripper includes a mounting base, a Z-shaped plate, and a second cylinder, and there are two Z-shaped plates and two second cylinders. The mounting base is fixedly connected to the mobile vehicle and has a pin. The cylinder seats of the two second cylinders are fixedly connected to the mounting base and correspond one-to-one with the two Z-shaped plates; The piston rod of the second cylinder is fixedly connected to the top of the Z-shaped plate, and horizontal grooves are opened horizontally in the middle of each Z-shaped plate; The two Z-shaped plates are stacked together, so that the pin is inserted into the two transverse slots; An arc-shaped plate is fixedly installed at the bottom end of each Z-shaped plate; The two second cylinders are driven to move the two arc-shaped plates closer to or further apart from each other.

6. The automatic packaging machine for lightweight pipes according to claim 1, characterized in that, It also includes a film winding mechanism, which is located upstream of the film supporting mechanism; The film winding mechanism includes a support frame, on which multiple shafts for the film roller to pass through are horizontally fixed.

7. The automatic packaging machine for lightweight pipes according to claim 3, characterized in that, It also includes a membrane breaking mechanism; The film-cutting mechanism includes a cylinder seat of a rodless cylinder that is fixedly connected to the frame, and a hot-cutting wire seat is fixedly mounted on the slide, with a heating wire mounted on the hot-cutting wire seat; The heating wire can move through the downstream of multiple membrane support mechanisms and along the width of the frame.

8. The automatic packaging machine for lightweight pipes according to claim 3, characterized in that, It also includes a pipe jacking mechanism, which is located at one end of the frame away from the membrane support mechanism, and includes a third cylinder and multiple jacking rods; The cylinder seat of the third cylinder is fixedly connected to the frame, and the piston rod extends and retracts along the length of the frame. A transverse plate is fixed on the piston rod of the third cylinder, and multiple push rods are evenly distributed and fixed on the transverse plate along the width of the frame and arranged along the length of the frame.

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