Automatic sleeve machine for flat paper tubes

Abstract

The utility model provides a kind of flat paper tube automatic sleeve machine, belong to sleeve machine technical field.It includes frame, the left and right sides of the frame are respectively provided with flat paper tube feeding mechanism and sleeve mechanism, the flat paper tube feeding mechanism and sleeve mechanism between still be equipped with bag taking mechanism, the bag taking mechanism is set in frame top.Bag taking transfer cylinder can move the upper translation seat to the top of flat paper tube feeding mechanism along horizontal slide rail, No. one lifting assembly drives double -deck material taking seat to descend to and flat paper tube is attached, utilize suction cup subassembly can adsorb flat paper tube, open barrel subassembly can open flat paper tube, and after the paper tube that is partly open moves to and passes between flat paper tube feeding mechanism and sleeve mechanism, rotating translation subassembly can first rotate sleeve seat to sleeve subassembly towards bag taking mechanism, then sleeve subassembly is translated to insert into paper tube, finally utilize sleeve subassembly to complete paper tube to open, can effectively improve the opening efficiency of paper tube.

Description

Technical Field

[0001] This utility model belongs to the field of sleeve machine technology, and relates to an automatic sleeve machine for flat paper tubes. Background Technology

[0002] In order to reduce the volume of paper tubes during transportation, they are flattened for transport. When in use, the paper tubes need to be opened into a cylindrical shape. In the current technology, the sleeves of flat paper tubes are opened manually, which is inefficient. Utility Model Content

[0003] The purpose of this invention is to address the above-mentioned problems by providing an automatic flat paper tube sleeve machine.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An automatic flat paper tube sleeve machine includes a frame, with a flat paper tube feeding mechanism and a sleeve mechanism respectively arranged on the left and right sides of the frame, and a bag picking mechanism is provided between the flat paper tube feeding mechanism and the sleeve mechanism, with the bag picking mechanism located on the top of the frame.

[0006] The bag-picking mechanism includes a horizontal slide rail set on the top of the frame, with the two ends of the horizontal slide rail facing the upper flat paper tube feeding mechanism and the sleeve mechanism respectively. An upper translation seat is slidably connected to the horizontal slide rail. The top of the frame is also provided with a bag-picking and transfer cylinder connected to the upper translation seat through a No. 1 connecting plate. A double-layer picking seat is connected to the upper translation seat through a No. 1 lifting component. The No. 1 lifting component is connected to the upper layer of the double-layer picking seat. A suction cup component is also provided on the lower layer of the double-layer picking seat. An opening component is also provided on the double-layer picking seat.

[0007] The sleeve mechanism includes a sleeve base, and a rotation and translation component connected to the sleeve base is provided on the frame. The sleeve base is also connected to a sleeve component rotating seat through a first rotation component. Three sleeve components are arranged circumferentially on the sleeve component rotating seat.

[0008] In the above-mentioned flat paper tube automatic sleeve machine, the tube opening assembly includes two tube opening side panels disposed on both sides of the double-layer feeding seat. Between the two tube opening side panels, there is also a tube opening side mold connected to the tube opening side panels. The tube opening side panels and the tube opening side mold extend from the top of the double-layer feeding seat to both sides of the double-layer feeding seat to the bottom of the double-layer feeding seat. The bottom of the tube opening side panel is bent outward. The top of the tube opening side panel is also fixedly connected to a tube opening cylinder. The bottom of the output shaft of the tube opening cylinder passes through the tube opening side panel and is connected to the double-layer feeding seat.

[0009] The first lifting assembly includes a lifting cylinder fixed on the upper translation seat, and the output shaft end of the lifting cylinder is connected to the double-layer material handling seat.

[0010] In the aforementioned flat paper tube automatic sleeve machine, the suction cup assembly includes several suction cups arranged on a double-layer material handling seat, and the top of the suction cups is connected to a negative pressure pump via a flexible hose.

[0011] In the aforementioned automatic flat paper tube sleeve machine, the rotary translation component includes a rotary plate driven by a No. 1 motor. A linear slide rail is fixedly connected to the rotary plate. The linear slide rail is connected to the sleeve seat through the No. 1 translation component. The No. 1 translation component includes a No. 2 motor. A No. 1 lead screw connected to the No. 2 motor is provided on the linear slide rail. A lower translation seat fixedly connected to the sleeve seat is screwed onto the No. 1 lead screw.

[0012] In the aforementioned automatic flat paper tube sleeve machine, the sleeve assembly includes a sleeve mounting base fixed on a sleeve rotating seat. A guide shaft parallel to a linear slide rail is fixedly connected to the sleeve mounting base. Several tension plates are arranged circumferentially around the guide shaft. The guide shaft is hollow and has a second lead screw at its center. A third motor connected to the second lead screw is also provided on the sleeve mounting base. Several guide grooves corresponding to the tension plates are provided on the side wall of the guide shaft. The inner end of the tension plate is rotatably connected to the sleeve mounting base through a first adapter. A translational sleeve is screwed onto the second lead screw. Several connecting plates corresponding to the tension plates are rotatably connected to the translational sleeve. The connecting plates pass through the guide grooves and are rotatably connected to the tension plates through the second adapter.

[0013] In the aforementioned automatic flat paper tube sleeve machine, the two sides of the connecting plate slide in cooperation with the inner wall of the guide groove, and the cross-section of the tensioning plate is arc-shaped.

[0014] In the aforementioned automatic flat paper tube sleeve machine, a rodless cylinder seat located on the side of the guide shaft is also fixedly connected to the sleeve mounting base. A rodless cylinder is installed on the rodless cylinder seat. The piston rod of the rodless cylinder is parallel to the guide shaft. An annular push plate concentrically arranged with the guide shaft is also installed on the sleeve mounting base. The rodless cylinder is connected to the annular push plate through an L-shaped connecting plate.

[0015] In the aforementioned flat paper tube automatic sleeve machine, the first rotating component includes a fourth motor fixed on the sleeve base, and the output shaft of the fourth motor is connected to the sleeve rotating base.

[0016] In the aforementioned automatic flat paper tube sleeve machine, the flat paper tube feeding mechanism includes two bearing platforms fixed on the machine frame base plate. The bearing platforms are provided with several limiting rods that surround and form a flat paper tube storage trough. The machine frame base plate is also provided with a lifting component that can drive the flat paper tubes on the bearing platforms to rise as a whole.

[0017] In the aforementioned automatic flat paper tube sleeve machine, the lifting assembly includes two vertical guide rods, with lifting sliders slidably connected to the vertical guide rods. A lifting plate is connected between the two lifting sliders, and a No. 5 motor is fixedly connected to the lifting plate. The No. 5 motor is located between two support platforms, and a lifting seat is fixedly connected to the No. 5 motor. A lifting rack fixed to the frame is provided between the two vertical guide rods. The output shaft of the No. 5 motor horizontally passes through the lifting plate and is fixedly connected to a lifting gear that meshes with the lifting rack.

[0018] Compared with existing technologies, the advantages of this utility model are:

[0019] 1. The flat paper tube feeding mechanism can store a certain amount of flat paper tubes. The bag-taking and transfer cylinder can move the upper translation seat along the horizontal slide rail to the top of the flat paper tube feeding mechanism. The No. 1 lifting component drives the double-layer picking seat to descend and fit with the flat paper tube. The suction cup component can be used to hold the flat paper tube. The opening component can open the flat paper tube. After the partially opened paper tube moves and passes between the flat paper tube feeding mechanism and the sleeve mechanism, the rotation and translation component can first rotate the sleeve seat so that the sleeve component faces the bag-taking mechanism, and then translate the sleeve component to insert it into the paper tube. Finally, the sleeve component is used to fully open the paper tube, which can effectively improve the opening efficiency of the paper tube.

[0020] 2. Three sleeve components are set on the sleeve component rotating seat. The sleeve component corresponding to the bag picking mechanism can be adjusted by rotating the first rotating component. The rotating translation component can continuously open the three paper tubes in one rotation. After the three paper tubes are put on the sleeve components, the rotating translation component drives the sleeve seat to rotate to be perpendicular to the bag picking mechanism for material discharge.

[0021] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a partial structural schematic diagram of the present invention;

[0024] Figure 3 This is a schematic diagram of the front structure of the flat paper tube feeding mechanism;

[0025] Figure 4 This is a schematic diagram of the structure on the back of the flat paper tube feeding mechanism;

[0026] Figure 5 This is a schematic diagram of the bag-retrieving mechanism;

[0027] Figure 6 This is a partial structural diagram of the bag-retrieving mechanism;

[0028] Figure 7 This is a schematic diagram of the sleeve mechanism;

[0029] Figure 8 This is a structural schematic diagram of the sleeve assembly. Detailed Implementation

[0030] like Figures 1-8 As shown, an automatic flat paper tube sleeve machine includes a frame 1. A flat paper tube feeding mechanism 2 and a sleeve mechanism 3 are respectively arranged on the left and right sides of the frame 1. A bag-picking mechanism 4 is also provided between the flat paper tube feeding mechanism 2 and the sleeve mechanism 3, and the bag-picking mechanism 4 is located at the top of the frame 1. The bag-picking mechanism 4 includes a horizontal slide rail 5 located at the top of the frame 1. The two ends of the horizontal slide rail 5 face the upper flat paper tube feeding mechanism 2 and the sleeve mechanism 3 respectively. An upper translation seat 6 is slidably connected to the horizontal slide rail 5. The top of the frame 1 is also provided with a connection plate connected to the upper translation seat 6. The bag-taking and transfer cylinder 7 is connected to the upper translation seat 6, and a double-layer material-taking seat 8 is connected to the upper layer of the double-layer material-taking seat 8 via a first lifting component. The lower layer of the double-layer material-taking seat 8 is also provided with a suction cup component 9, and the double-layer material-taking seat 8 is also provided with a cylinder opening component 10. The sleeve mechanism 3 includes a sleeve seat 11, and a rotation translation component 12 connected to the sleeve seat 11 is provided on the frame 1. A sleeve component rotating seat is also connected to the sleeve seat 11 via a first rotation component, and three sleeve components 14 are arranged circumferentially on the sleeve component rotating seat.

[0031] In this utility model, the flat paper tube feeding mechanism 2 can store a certain amount of flat paper tubes, the bag taking and transfer cylinder 7 can move the upper translation seat along the horizontal slide rail to the top of the flat paper tube feeding mechanism 2, the first lifting component drives the double-layer material taking seat 8 to descend to fit with the flat paper tube, the suction cup component 9 can adsorb the flat paper tube, the tube opening component 10 can open the flat paper tube, the partially opened paper tube moves and passes between the flat paper tube feeding mechanism 2 and the sleeve mechanism 3, the rotation translation component 12 can first rotate the sleeve seat 11 so that the sleeve component 14 faces the bag taking mechanism 4, then translate the sleeve component 14 to insert into the paper tube, and finally use the sleeve component to open the paper tube, which can effectively improve the opening efficiency of the paper tube;

[0032] Three sleeve assemblies 14 are set on the sleeve component rotating seat. The sleeve assembly corresponding to the bag picking mechanism can be adjusted by rotating the first rotating assembly. The rotating translation assembly 12 can continuously open the three paper tubes in one rotation. After the three paper tubes are put on the sleeve assembly, the rotating translation assembly 12 drives the sleeve seat to rotate to be perpendicular to the bag picking mechanism for material discharge.

[0033] Specifically, the opening assembly 10 includes two opening side panels 15 disposed on both sides of the double-layer material handling seat 8. An opening side mold 16 connected to the opening side panels 15 is also disposed between the two opening side panels 15. The opening side panels 15 and the opening side mold 16 extend from the top of the double-layer material handling seat 8 to both sides of the double-layer material handling seat 8 and to the bottom of the double-layer material handling seat 8. The bottom of the opening side panels 15 is bent outward. An opening cylinder 17 is also fixedly connected to the top of the opening side panels 15. The bottom of the output shaft of the opening cylinder 17 passes through the opening side panels 15 and is connected to the double-layer material handling seat 8. The first lifting assembly includes a lifting cylinder 18 fixed on the upper translation seat 6. The end of the output shaft of the lifting cylinder 18 is connected to the double-layer material handling seat 8. The suction cup assembly 9 includes several suction cups 19 disposed on the double-layer material handling seat 8. The top of the suction cups 19 is connected to the negative pressure pump through a hose.

[0034] The lifting cylinder 18 can drive the double-layer feeding seat to rise and fall vertically, thereby enabling the flat paper tube stored in the flat paper tube feeding mechanism 2 to be attracted by the suction cup on the double-layer feeding seat and lifted to the height corresponding to the sleeve assembly. After the suction cup attracts the flat paper tube, the opening cylinder 17 can drive the opening side panel 15 and the opening side mold 16 to descend, squeezing and opening a portion of the flat paper tube attracted at the bottom of the double-layer feeding seat, so that the sleeve assembly can be inserted into the paper tube to open the paper tube.

[0035] Specifically, the rotation and translation assembly 12 includes a rotating plate 20 driven by a first motor 46. A linear slide rail 21 is fixedly connected to the rotating plate 20. The linear slide rail 21 is connected to the sleeve seat 11 through the first translation assembly. The first translation assembly includes a second motor 22. A first lead screw 23 connected to the second motor 22 is provided on the linear slide rail 21. A lower translation seat 24 fixedly connected to the sleeve seat 11 is screwed onto the first lead screw 23. A rotating platform is installed on the base plate of the frame, and a rotating gear is installed at the bottom of the rotating platform. Motor 46 is connected to the rotating gear through a reducer and a drive gear. The central axis of the rotating gear is connected to the rotating plate on the upper side of the rotating platform. Motor 46 drives the rotating plate to rotate, which can rotate the sleeve assembly on the sleeve seat to face the bag taking mechanism 4. After the sleeve assembly faces the bag taking mechanism, Motor 22 drives the lead screw to rotate, which can drive the lower translation seat 24 and the sleeve seat to reciprocate in the direction of approaching or moving away from the bag taking mechanism. The sleeve seat moves towards the bag taking mechanism, which can insert the sleeve assembly on the sleeve seat into the partially open paper tube so that the sleeve assembly can open the paper tube. The sleeve seat moves towards the bag taking mechanism, which can remove the paper tube on the sleeve assembly from the bag taking mechanism.

[0036] Specifically, the sleeve assembly 14 includes a sleeve mounting base 25 fixed on a sleeve rotating seat. A guide shaft 26 parallel to the linear slide rail 21 is fixedly connected to the sleeve mounting base 25. A plurality of tensioning plates 27 are arranged circumferentially around the guide shaft 26. The guide shaft 26 is hollow and a second lead screw 28 is arranged at its center. A third motor 29 connected to the second lead screw 28 is also provided on the sleeve mounting base 25. A plurality of guide grooves 30 corresponding to the tensioning plates 27 are arranged on the side wall of the guide shaft 26. The inner end of the tensioning plate 27 is rotatably connected to the sleeve mounting base 25 through a first adapter. A translational sleeve 31 is screwed onto the second lead screw 28. A plurality of connecting plates 32 corresponding to the tensioning plates 27 are rotatably connected to the translational sleeve 31. The connecting plates 32 pass through the guide grooves 30 and are rotatably connected to the tensioning plates 27 through the second adapter. Before the sleeve assembly is inserted into the paper tube, motor number three drives screw number two to rotate. The rotation of screw number two can drive the translational sleeve 31 to move to the outer end of screw number two. When the translational sleeve is at the outer end of screw number two, under the action of connecting plate 32 on the translational sleeve, the outer end of the tensioning plate retracts towards the guide shaft so that the tensioning plate around the guide shaft 26 can be inserted into the paper tube. After the tensioning plate around the guide shaft is inserted into the paper tube, motor number three drives screw number two 28 to move the translational sleeve to the middle of screw number two, so that the outer end of the tensioning plate can be unfolded outward to be flush with the inner end of the tensioning plate, thereby opening the paper tube.

[0037] Specifically, the two sides of the connecting plate 32 slide in conjunction with the inner wall of the guide groove 30, and the cross section of the tensioning plate 27 is arc-shaped.

[0038] Specifically, a rodless cylinder seat 33 located on the side of the guide shaft 26 is fixedly connected to the sleeve mounting base 25. A rodless cylinder 34 is mounted on the rodless cylinder seat 33, with its piston rod 35 parallel to the guide shaft 26. An annular push plate 36, concentrically aligned with the guide shaft 26, is also mounted on the sleeve mounting base 25. The rodless cylinder 34 is connected to the annular push plate 36 via an L-shaped connecting plate 32. After the paper tube is opened, the movement of the rodless cylinder along its piston rod drives the annular push plate to move axially along the guide shaft from the inside out via the L-shaped connecting plate, thereby pushing the paper tube fitted onto the tension plate outward.

[0039] Specifically, the first rotating component includes a fourth motor 37 fixed on the sleeve base 11, and the output shaft of the fourth motor 37 is connected to the sleeve component rotating seat. The fourth motor can drive the sleeve component rotating seat to rotate, and the rotation of the sleeve component rotating seat can switch the positions of the three sleeve components on the sleeve component rotating seat, so that the sleeve components in different positions can be aligned with the bag picking mechanism.

[0040] Specifically, the flat paper tube feeding mechanism 2 includes two supporting platforms 38 fixed to the base plate of the frame 1. Several limiting rods 39 are provided on the supporting platforms 38 to form a flat paper tube storage trough. The base plate of the frame 1 is also provided with a lifting component that can drive the flat paper tubes on the supporting platforms 38 to rise as a whole. The lifting component includes two vertical guide rods 40. Lifting sliders 41 are slidably connected to the vertical guide rods 40. A lifting plate 42 is connected between the two lifting sliders 41. A No. 5 motor 47 is fixedly connected to the lifting plate 42. The No. 5 motor 47 is located between the two supporting platforms 38. A lifting seat 43 is fixedly connected to the No. 5 motor 47. A lifting rack 44 fixed to the frame 1 is provided between the two vertical guide rods 40. The output shaft of the No. 5 motor 47 horizontally passes through the lifting plate 42 and is fixedly connected to a lifting gear 45 that meshes with the lifting rack 44. Two support platforms 38 can support a certain amount of flat paper tubes. The flat paper tube storage trough formed by several limit rods 39 can limit the flat paper tubes. After the flat paper tube is loaded, the No. 5 motor drives the lifting gear to rotate, which can make the No. 5 motor and the lifting plate rise along the lifting rack, so that the flat paper tube can be lifted upward by the lifting seat fixed on the No. 5 motor.

[0041] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An automatic flat paper tube sleeve machine, comprising a frame (1), characterized in that, The frame (1) is provided with a flat paper tube feeding mechanism (2) and a sleeve mechanism (3) on the left and right sides respectively. A bag taking mechanism (4) is also provided between the flat paper tube feeding mechanism (2) and the sleeve mechanism (3). The bag taking mechanism (4) is located on the top of the frame (1). The bag-taking mechanism (4) includes a horizontal slide rail (5) set on the top of the frame (1). The two ends of the horizontal slide rail (5) are respectively facing the upper flat paper tube feeding mechanism (2) and the sleeve mechanism (3). An upper translation seat (6) is slidably connected on the horizontal slide rail (5). The top of the frame (1) is also provided with a bag-taking and transfer cylinder (7) connected to the upper translation seat (6) through a first connecting plate. A double-layer material-taking seat (8) is connected to the upper translation seat (6) through a first lifting component. The first lifting component is connected to the upper layer of the double-layer material-taking seat (8). A suction cup component (9) is also provided on the lower layer of the double-layer material-taking seat (8). An opening component (10) is also provided on the double-layer material-taking seat (8). The sleeve mechanism (3) includes a sleeve seat (11), and a rotation and translation component (12) connected to the sleeve seat (11) is provided on the frame (1). The sleeve seat (11) is also connected to a sleeve component rotating seat through a first rotation component. Three sleeve components (14) are provided on the sleeve component rotating seat along the circumferential direction.

2. The automatic flat paper tube sleeve machine according to claim 1, characterized in that, The opening assembly (10) includes two opening side panels (15) arranged on both sides of the double-layer feeding seat (8). An opening side mold (16) connected to the opening side panel (15) is also provided between the two opening side panels (15). The opening side panels (15) and the opening side mold (16) extend from the top of the double-layer feeding seat (8) to both sides of the double-layer feeding seat (8) to the bottom of the double-layer feeding seat (8). The bottom of the opening side panel (15) is bent outward. An opening cylinder (17) is also fixedly connected to the top of the opening side panel (15). The bottom of the output shaft of the opening cylinder (17) passes through the opening side panel (15) and is connected to the double-layer feeding seat (8). The first lifting assembly includes a lifting cylinder (18) fixed on the upper translation seat (6), and the output shaft end of the lifting cylinder (18) is connected to the double-layer material handling seat (8).

3. The automatic flat paper tube sleeve machine according to claim 1, characterized in that, The suction cup assembly (9) includes several suction cups (19) arranged on the double-layer material handling base (8), and the top of the suction cups (19) is connected to the negative pressure pump through a hose.

4. The automatic flat paper tube sleeve machine according to any one of claims 1-3, characterized in that, The rotation and translation assembly (12) includes a rotating plate (20) driven by a first motor (46). A linear slide rail (21) is fixedly connected to the rotating plate (20). The linear slide rail (21) is connected to the sleeve seat (11) through the first translation assembly. The first translation assembly includes a second motor (22). A first lead screw (23) connected to the second motor (22) is provided on the linear slide rail (21). A lower translation seat (24) fixedly connected to the sleeve seat (11) is screwed onto the first lead screw (23).

5. The automatic flat paper tube sleeve machine according to claim 4, characterized in that, The sleeve assembly (14) includes a sleeve mounting base (25) fixed on a sleeve rotating seat. A guide shaft (26) parallel to the linear slide rail (21) is fixedly connected to the sleeve mounting base (25). Several tension plates (27) are arranged circumferentially around the guide shaft (26). The guide shaft (26) is hollow and has a second lead screw (28) at its center. The sleeve mounting base (25) is also equipped with a third motor (29) connected to the second lead screw (28). The side wall of the shaft (26) is provided with several guide grooves (30) corresponding to the tension plate (27). The inner end of the tension plate (27) is rotatably connected to the sleeve mounting base (25) through the first adapter seat. The second lead screw (28) is screwed with a translation sleeve (31). Several connecting plates (32) corresponding to the tension plate (27) are rotatably connected to the translation sleeve (31). The connecting plates (32) pass through the guide grooves (30) and are rotatably connected to the tension plate (27) through the second adapter seat.

6. The automatic flat paper tube sleeve machine according to claim 5, characterized in that, The connecting plate (32) slides with the inner wall of the guide groove (30) on both sides, and the tensioning plate (27) has an arc-shaped cross section.

7. The automatic flat paper tube sleeve machine according to claim 5, characterized in that, The sleeve mounting base (25) is also fixedly connected to a rodless cylinder seat (33) located on the side of the guide shaft (26). A rodless cylinder (34) is provided on the rodless cylinder seat (33). The piston rod (35) of the rodless cylinder (34) is parallel to the guide shaft (26). An annular push plate (36) is also provided on the sleeve mounting base (25) and is concentrically arranged with the guide shaft (26). The rodless cylinder (34) is connected to the annular push plate (36) through an L-shaped connecting plate (32).

8. The automatic flat paper tube sleeve machine according to any one of claims 1-3, characterized in that, The first rotating component includes a fourth motor (37) fixed on the sleeve base (11), and the output shaft of the fourth motor (37) is connected to the rotating base of the sleeve component.

9. The automatic flat paper tube sleeve machine according to any one of claims 1-3, characterized in that, The flat paper tube feeding mechanism (2) includes two bearing platforms (38) fixed on the bottom plate of the frame (1). The bearing platforms (38) are provided with several limiting rods (39) that surround and form a flat paper tube storage trough. The bottom plate of the frame (1) is also provided with a lifting component that can drive the flat paper tubes on the bearing platforms (38) to rise as a whole.

10. The automatic flat paper tube sleeve machine according to claim 9, characterized in that, The lifting assembly includes two vertical guide rods (40), with lifting sliders (41) slidably connected to the vertical guide rods (40). A lifting plate (42) is connected between the two lifting sliders (41). A No. 5 motor (47) is fixedly connected to the lifting plate (42). The No. 5 motor (47) is located between two bearing platforms (38). A lifting seat (43) is fixedly connected to the No. 5 motor (47). A lifting rack (44) fixed to the frame (1) is provided between the two vertical guide rods (40). The output shaft of the No. 5 motor (47) horizontally passes through the lifting plate (42) and is fixedly connected to a lifting gear (45) that meshes with the lifting rack (44).

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