Feeding device for pipe laser cutting

Abstract

The utility model belongs to the technical field of laser cutting, and relates to a feeding device for pipe laser cutting, which comprises a machine frame arranged on one side of a laser cutting machine, a plurality of pipe feeding mechanisms are arranged on one side, far away from the laser cutting machine, of the machine frame, and a plurality of pipe arranging mechanisms connected with the pipe feeding mechanisms are arranged on the machine frame. The pipe arranging mechanism comprises a lower limiting plate arranged in an inclined mode and an upper limiting plate arranged above the lower limiting plate in parallel, a sliding way used for arranging pipes is formed between the upper limiting plate and the lower limiting plate, the upper limiting plate is connected with a lifting mechanism, and the lower end of the lower limiting plate is connected with a pipe distributing mechanism. And a feeding mechanism is connected between the pipe dividing mechanism and the laser cutting machine. According to the pipe distributing device, the pipe feeding mechanism feeds the pipes into the sliding way, the pipe distributing mechanism is directly arranged at the bottom of the sliding way, an additional feeding mechanism or unit does not need to be additionally arranged, the equipment cost and the occupied space are saved, and the economic benefit is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of laser cutting, in particular to a feeding device for laser cutting of pipes. Background Art

[0002] Since laser pipe cutting machines have the characteristics of high precision, fast cutting, not limited to cutting patterns, smooth cut surfaces, and low processing costs, they have gradually replaced traditional pipe cutting process equipment. In the whole processing process of the laser pipe cutting machine for pipes, the feeding process is an important link. Whether the pipes can be quickly and accurately transported to the processing position determines the efficiency and processing quality of the whole processing process. However, most of the existing pipe feeding mechanisms use manual feeding or semi-automatic feeding methods. The efficiency of these two feeding methods is relatively low. When encountering pipes with a very large mass, lifting equipment is also needed for operation, which takes a long time, has low efficiency, and has a relatively high degree of danger. Although the use of automatic feeding methods can reduce the labor intensity of operators, the existing feeding devices with a relatively high degree of automation have insufficient inclusiveness for pipe types, sizes, pipe wall thicknesses, etc., and the success rate of feeding once is relatively low, requiring multiple operations and unable to meet the usage requirements of laser pipe cutting machines.

[0003] Patent No. CN201820981308.2 discloses a pipe feeding device, which relates to the field of machine tool feeding. This device uses multiple parts to cooperate to ensure the automation and orderly progress of pipe material transportation. Among them, the material storage part is mainly used to carry pipes and send out the pipes. The stacked pipes are laid flat on the conveying platform of the feeding part under the action of the height limiting part. The feeding part transports the pipes to the sliding rack slope of the material selection platform in the material selection part. In the material selection part, the moving hard limit positions the pipes. By moving the moving hard limit, the pipes are selected, and the material distribution part distributes the pipes; the pipes are positioned by the fixed-length part. After the positioning is completed, the rotating feeding part transports the pipes to the processing area. The specific implementation of this disclosed patent records that the feeding chain 31 of the feeding part 3 cooperates with the support sprocket 32 to send the pipe 8 to the sliding rack 51. Since the sliding rack 51 has a certain slope, the pipe 8 slides freely under its own gravity to the moving hard limit 52. A sensor is installed in the moving hard limit 52. At this time, the pipe senses the sensor installed in the moving hard limit 52, and the feeding motor stops rotating and the feeding part 3 stops working. The pipe 8 is laid flat on the surfaces of the feeding chain 31 and the sliding rack 51. The material is fed by the material storage part 2 and needs to pass through the feeding part 3 to transport the material to the material selection part 5. The design of the feeding part 3 not only increases the equipment cost, but also makes the width of the whole equipment larger and occupies more space. Therefore, the utility model proposes a feeding device for laser cutting of pipes. Summary of the Utility Model

[0004] The main purpose of the present utility model is to provide a feeding device for laser cutting of pipes, which can...

[0005] The present utility model realizes the above object through the following technical solutions: A feeding device for laser cutting of pipes includes a frame provided on one side of a laser cutting machine. On the side of the frame away from the laser cutting machine, there are multiple pipe loading mechanisms. On the frame, there are multiple pipe arranging mechanisms connected to the pipe loading mechanisms. The pipe arranging mechanism includes an inclined lower limit plate and an upper limit plate arranged in parallel above the lower limit plate. A slideway for arranging pipes is formed between the upper limit plate and the lower limit plate. The upper limit plate is connected with a lifting mechanism. The lower end of the lower limit plate is connected with a pipe dividing mechanism. A feeding mechanism is connected between the pipe dividing mechanism and the laser cutting machine.

[0006] Preferably, the lifting mechanism includes a mounting plate vertically arranged on a cross beam at the top of the frame. The mounting plate is slidably connected with a first movable block through a vertical slide rail. The upper limit plate is fixed to the bottom end of the first movable block. The first movable block is provided with a first rack in the vertical direction. A first servo motor is fixed on the mounting plate. The first servo motor is connected with a first driving shaft parallel to the cross beam through a speed reducer. A first gear meshing with the first rack is connected to the first driving shaft.

[0007] Preferably, on the side of the cross beam facing the laser cutting machine, a first pushing cylinder is horizontally arranged through an L-shaped bracket. A first pushing block is fixed on the ejector rod of the first pushing cylinder.

[0008] Preferably, the lower limit plate includes an inclined part and a horizontal part arranged at the bottom end of the inclined part. At the transition between the inclined part and the horizontal part, there is a material blocking part perpendicular to the inclined part. The top end of the material blocking part is set as an inclined plane parallel to the inclined part. A pipe dividing groove is arranged on the horizontal part. Two lower limit plates are symmetrically arranged. The pipe dividing mechanism includes a second pushing cylinder arranged on the side surface of the lower limit plate and perpendicular to the inclined part. A second pushing block is connected to the ejector rod of the second pushing cylinder.

[0009] Preferably, an L-shaped supporting plate is connected between the two lower limit plates. The L-shaped supporting plate is located in the pipe dividing groove. The sharp angle of the L-shaped supporting plate faces downward. The corner of the L-shaped supporting plate is rotatably connected to the inner wall of the lower limit plate through a pin shaft. One side of the L-shaped supporting plate is aligned with the inclined plane of the material blocking part. A servo cylinder is vertically arranged on the frame. The ejector rod of the servo cylinder is rotatably connected to the lower end surface of one side of the L-shaped supporting plate close to the material blocking part through a pin shaft.

[0010] Preferably, the inner sidewall of the inclined portion is slidably connected with a slider through a slide rail parallel thereto. A third push block perpendicular to the slider is fixed on the slider. A lead screw is rotatably provided on the inner sidewall of the inclined portion through a connecting block and a bearing. The lead screw is connected to the slider through a lead screw nut. A second servo motor is provided on the frame. The second servo motor is connected with a second drive shaft parallel to the cross beam through a speed reducer. The second drive shaft is connected to the lead screw through a bevel gear set.

[0011] Preferably, a base parallel to the frame is provided on one side of the frame. The feeding mechanism is arranged on the base. There are two feeding mechanisms. The feeding mechanism includes a support plate with a U-shaped cross section vertically arranged on the base. The front surface of the support plate is slidably connected with an L-shaped plate with a horizontal part facing upward through a vertical slide rail. A lifting cylinder is arranged inside the support plate. The ejector rod of the lifting cylinder is connected to the lower end surface of the horizontal part of the L-shaped plate. A connecting plate is arranged on the upper end surface of the horizontal part of the L-shaped plate. Two side plates along its length direction are fixed on the lower end surface of the connecting plate. One end of the side plate is rotatably connected to the L-shaped plate through a pin shaft. A second servo cylinder is arranged on the front surface of the vertical part of the L-shaped plate. The ejector rod of the second servo cylinder is rotatably connected to the other end of the side plate through a pin shaft. The upper end surface of the side plate is slidably connected with a U-shaped plate through a slide rail. Conveyor chains are arranged on both sides inside the U-shaped plate. The conveyor chains are driven by a third servo motor. A third servo cylinder parallel to the U-shaped plate is arranged on the connecting plate. The ejector rod of the third servo cylinder is connected to the side wall of the U-shaped plate.

[0012] Preferably, the upper end surface of the base is slidably connected with a movable plate through a slide rail along its length direction. The support plate of the feeding mechanism on the left side is fixed on the upper end surface of the movable plate. A second rack along the length direction of the base is arranged on the base. A driving motor is fixed on the movable plate. The output end of the driving motor is connected with a second gear meshing with the second rack. A first push plate is fixed on the movable plate on the left side of the feeding mechanism through a bracket. A second push plate is fixed on the right end of the base through a bracket.

[0013] The beneficial effect of the technical solution of the present utility model is that in this application, the upper pipe mechanism loads the pipe into the slideway. The pipe splitting mechanism is directly arranged at the bottom of the slideway, without the need to add an additional feeding mechanism or unit, saving equipment costs and floor space, and having higher economic benefits. Description of the Drawings

[0014] Figure 1 It is the layout diagram of the feeding device for laser cutting of pipes in the working state of the embodiment.

[0015] Figure 2 is Figure 1Enlarged view of part A

[0016] Figure 3 It is a schematic diagram of the base structure

[0017] Figure 4 Is Figure 3 Enlarged view of part B

[0018] Figure 5 It is a schematic diagram of the branch pipe mechanism structure

[0019] Figure 6 It is a schematic diagram of the feeding mechanism structure

[0020] Figure 7 It is a schematic diagram of the support plate structure

[0021] The numbers in the figure represent

[0022] 1. Frame; 2. Tightening wheel; 3. Column; 4. Fourth servo motor; 5. Lower limit plate; 6. Upper limit plate; 7. Mounting plate; 8. First movable block; 9. First rack; 10. First servo motor; 11. First drive shaft; 12. First gear; 13. First pushing cylinder; 14. First push block; 15. Inclined part; 16. Horizontal part; 17. Material blocking part; 18. Inclined surface; 19. Branch pipe groove; 20. Second pushing cylinder; 21. Second push block; 22. L-shaped support plate; 23. Servo cylinder; 24. Slide block; 25. Third push block; 26. Lead screw; 27. Second servo motor; 28. Second drive shaft; 29. Base; 30. Support plate; 31. L-shaped plate; 32. Lifting cylinder; 33. Connecting plate; 34. Side plate; 35. Second servo cylinder; 36. U-shaped plate; 37. Conveyor chain; 38. Third servo motor; 39. Third servo cylinder; 40. Movable plate; 41. Second rack; 42. Drive motor; 43. Second gear; 44. First pushing plate; 45. Second pushing plate Specific embodiments

[0023] The following further elaborates on the present utility model in conjunction with specific embodiments

[0024] Embodiment

[0025] Such as Figures 1 to 7As shown in the figure, a feeding device for laser cutting of pipes of the present utility model includes a frame 1 provided on one side of a laser cutting machine. A cross beam is provided on the frame. On the side of the frame 1 away from the laser cutting machine, a plurality of pipe loading mechanisms are provided. The pipe loading mechanism includes a cloth belt, a tightening wheel 2, and a column 3. The cloth belt is used to carry the pipes to be processed. One end of the cloth belt is wound around the tightening wheel 2, and the tightening wheel 2 is used to tighten the cloth belt. The tightening wheel 2 is driven by a fourth servo motor 4. The other end of the cloth belt is connected to the column 3 and is installed at a height higher than the tightening wheel 2. A material sinking space is formed between the column 3 and the tightening wheel 2. A plurality of pipe arranging mechanisms connected to the pipe loading mechanism are provided on the frame 1. The pipe arranging mechanism includes an inclined lower limiting plate 5 and an upper limiting plate 6 arranged parallel above the lower limiting plate 5. A slideway for arranging pipes is formed between the upper limiting plate 6 and the lower limiting plate 5. The upper limiting plate 6 is connected with a lifting mechanism. The lower end of the lower limiting plate 5 is connected with a pipe dividing mechanism. A feeding mechanism is connected between the pipe dividing mechanism and the laser cutting machine. The pipes to be processed are stacked in the material sinking space. The fourth servo motor 4 drives the tightening wheel 2 to tighten the cloth belt, thereby lifting the pipes upward so that the topmost pipe rolls into the slideway. Then the fourth servo motor drives the tightening wheel 2 to loosen, and the above actions are repeated to make the pipes line up in the slideway. The arranged pipes are taken out one by one through the pipe dividing unit, and then the single pipe is conveyed to the next station by the feeding mechanism.

[0026] The lifting mechanism includes a mounting plate 7 vertically provided on the cross beam at the top of the frame 1. A first movable block 8 is slidably connected to the mounting plate 7 through a vertical slide rail. The upper limiting plate 6 is fixed to the bottom end of the first movable block 8. A first rack 9 in the vertical direction is provided on the first movable block 8. A first servo motor 10 is fixed on the mounting plate 7. The first servo motor 10 is connected with a first driving shaft 11 parallel to the cross beam through a speed reducer. A first gear 12 meshing with the first rack 9 is connected to the first driving shaft 11. The first servo motor 10 drives the first gear 12 to rotate, and further drives the first movable block 8 to drive the upper limiting plate 6 to slide in the vertical direction, so as to adjust the distance between the upper limiting plate 6 and the lower limiting plate 5 to adapt to pipes of different specifications.

[0027] On the side of the cross beam facing the laser cutting machine, a first pushing cylinder 13 is horizontally provided through an L-shaped bracket. A first pushing block 14 is fixed on the ejector rod of the first pushing cylinder 13. When the pipe loading mechanism lifts the pipes to the top end of the lower limiting plate 5, if there is a situation of two pipes overlapping, the first pushing cylinder 13 drives the first pushing block 14 to push the upper pipe back into the material sinking space. Whether there is overlapping can be detected by a preset sensor.

[0028] The lower limit plate 5 includes an inclined portion 15 and a horizontal portion 16 provided at the bottom end of the inclined portion 15. A material blocking portion 17 perpendicular to the inclined portion 15 is provided at the transition between the inclined portion 15 and the horizontal portion 16. The top end of the material blocking portion 17 is provided with an inclined surface 18 parallel to the inclined portion 15. A branch pipe groove 19 is provided on the horizontal portion 16. Two of the lower limit plates 5 are symmetrically arranged. The branch pipe mechanism includes a second pushing cylinder 20 provided on the side surface of the lower limit plate 5 and perpendicular to the inclined portion 15. A second pushing block 21 is connected to the ejector rod of the second pushing cylinder 20. The pipes are arranged on the inclined portion 15. The second pushing cylinder 20 drives the second pushing block 21 to push out, so as to push out the pipe at the bottommost part in the inclined portion 15 and roll it into the branch pipe groove 19 along the inclined surface 18, thereby realizing the separation of single pipes.

[0029] An L-shaped support plate 22 is connected between the two lower limit plates 5. The L-shaped support plate 22 is located in the branch pipe groove 19. The tip of the L-shaped support plate 22 faces downward. The corner of the L-shaped support plate 22 is rotatably connected to the inner wall of the lower limit plate 5 through a pin shaft. One side of the L-shaped support plate 22 is aligned with the inclined surface 18 of the material blocking portion 17. A servo cylinder 23 is vertically provided on the frame 1. The ejector rod of the servo cylinder 23 is rotatably connected to the lower end surface of one side of the L-shaped support plate 22 close to the material blocking portion 17 through a pin shaft. The separated pipes fall into the L-shaped support plate 22. When the pipe to be processed is a square pipe or a rectangular pipe, the ejector rod of the servo cylinder 23 contracts, so as to lay the square pipe or the rectangular pipe flat for subsequent conveying.

[0030] The inner side wall of the inclined portion 15 is slidably connected with a slider 24 through a parallel slide rail. A third pushing block 25 perpendicular to it is fixed on the slider 24. A lead screw 26 is rotatably provided on the inner side wall of the inclined portion 15 through a connecting block and a bearing. The lead screw 26 is connected to the slider 24 through a lead screw nut. A second servo motor 27 is provided on the frame 1. The second servo motor 27 is connected with a second drive shaft 28 parallel to the cross beam through a speed reducer. The second drive shaft 28 is connected to the lead screw 26 through a bevel gear set. When the diameter of the pipe to be processed is relatively small, the second servo motor 27 drives the second drive shaft 28 to rotate, and then drives the lead screw 26 to rotate, and then drives the third pushing block 25 to slide, and then pushes up the pipe at the lowermost end, so that the second pushing block 21 can only push out one pipe.

[0031] On one side of the frame 1, there is a base 29 parallel to it. The feeding mechanism is arranged on the base 29. There are two feeding mechanisms. The feeding mechanism includes a support plate 30 with a U-shaped cross-section vertically arranged on the base 29. The front of the support plate 30 is slidably connected with an L-shaped plate 31 with a horizontal part facing upwards through a vertical slide rail. An elevating cylinder 32 is arranged inside the support plate 30. The ejector rod of the elevating cylinder 32 is connected to the lower end surface of the horizontal part of the L-shaped plate 31. A connecting plate 33 is arranged on the upper end surface of the horizontal part of the L-shaped plate 31. Two side plates 34 along its length are fixed on the lower end surface of the connecting plate 33. One end of the side plate 34 is rotatably connected to the L-shaped plate 31 through a pin shaft. On the front surface of the vertical part of the L-shaped plate 31, there is a second servo cylinder 35. The ejector rod of the second servo cylinder 35 is rotatably connected to the other end of the side plate 34 through a pin shaft. The upper end surface of the side plate 34 is slidably connected with a U-shaped plate 36 through a slide rail. On both sides inside the U-shaped plate 36, there are conveying chains 37. The conveying chains 37 are driven by a third servo motor 38. A third servo cylinder 39 parallel to the U-shaped plate 36 is arranged on the connecting plate 33. The ejector rod of the third servo cylinder 39 is connected to the side wall of the U-shaped plate 36. After the pipe falls into the sub-pipe groove 19, the ejector rod of the second servo cylinder 35 contracts to pull the conveying chain 37 to the horizontal. The elevating cylinder 32 drives the conveying chain 37 to move upwards to push the pipe out of the sub-pipe groove 19. The ejector rod of the third servo cylinder 39 extends to push the conveying chain forward for a certain distance. The third servo motor 38 drives the conveying chain 37 to operate to convey the pipe to the next station. After the conveying is completed, the third servo cylinder 39 and the second servo cylinder 35 are reset in sequence.

[0032] The upper end surface of the base 29 is slidably connected with a movable plate 40 through a slide rail along its length. The support plate 30 of the feeding mechanism on the left side is fixed on the upper end surface of the movable plate 40. A second rack 41 along the length direction is arranged on the base 29. A driving motor 42 is fixed on the movable plate 40. The output end of the driving motor 42 is connected with a second gear 43 meshing with the second rack 41. A first pushing plate 44 is fixed on the left side of the feeding mechanism on the movable plate 40 through a bracket. A second pushing plate 45 is fixed on the right end of the base 29 through a bracket. The driving motor 42 drives the second gear 43 to rotate, and then drives the movable plate 40 to slide on the base 29, so as to adjust the position of the feeding mechanism on the left side to adapt to pipes of different lengths. When the movable plate 40 slides to the right, it drives the first pushing plate 44 to the right. The first pushing plate 44 cooperates with the second pushing plate 45 to position the pipe.

[0033] The working process of this application is as follows: According to the specification parameters of the pipe to be processed, the positions of the upper limit plate 6 and the third push block 25 are controlled by a control cabinet arranged on one side of the frame 1 to adapt to the current pipe diameter. The pipe to be processed is stacked in the material sinking space. After starting the device, the pipe loading mechanism loads and arranges the pipes into the slideway. The pipe dividing mechanism ejects a single pipe groove and slides it into the pipe dividing groove 19. The feeding mechanism conveys a single pipe to the next working station. In this application, the pipe loading mechanism loads the pipes into the slideway, and the pipe dividing mechanism is directly arranged at the bottom of the slideway, without the need to add an additional feeding mechanism or unit, saving equipment costs and floor space, and having higher economic benefits.

[0034] The above are only some embodiments of the present utility model. For those of ordinary skill in the art, without departing from the creative concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A feeding device for tube laser cutting, characterized in that: It includes a frame arranged on one side of the laser cutting machine, a plurality of upper tube mechanisms are arranged on the side of the frame away from the laser cutting machine, a plurality of pipe arrangement mechanisms connected to the upper tube mechanisms are arranged on the frame, the pipe arrangement mechanisms include an inclined lower limit plate and an upper limit plate arranged parallel to the upper side of the lower limit plate, a slideway for arranging pipes is formed between the upper limit plate and the lower limit plate, the upper limit plate is connected to a lifting mechanism, the lower end of the lower limit plate is connected to a branch mechanism, and a feeding mechanism is connected between the branch mechanism and the laser cutting machine.

2. A feeding device for tube laser cutting according to claim 1, characterized in that: The lifting mechanism includes a mounting plate vertically arranged on the crossbeam at the top of the frame, the mounting plate is slidably connected to a first movable block via a vertical slide rail, the upper limit plate is fixed to the bottom end of the first movable block, the first movable block is provided with a first rack in the vertical direction, a first servo motor is fixed to the mounting plate, the first servo motor is connected to a first driving shaft parallel to the crossbeam via a reducer, and the first driving shaft is connected to a first gear meshing with the first rack.

3. A feeding device for tube laser cutting according to claim 2, characterized in that: A first pushing cylinder is horizontally arranged on one side of the crossbeam facing the laser cutting machine through an L-shaped bracket, and a first pushing block is fixed on the top rod of the first pushing cylinder.

4. A feeding device for tube laser cutting according to claim 3, characterized in that: The lower limit plate includes an inclined portion and a horizontal portion arranged at the bottom end of the inclined portion, a material stopping portion at a right angle to the inclined portion is provided at the transition between the inclined portion and the horizontal portion, the top of the material stopping portion is arranged as an inclined plane parallel to the inclined portion, a branching groove is arranged on the horizontal portion, two lower limit plates are symmetrically arranged, the branching mechanism includes a second pushing cylinder arranged on the side of the lower limit plate and perpendicular to the inclined portion, and a second pushing block is connected to the top rod of the second pushing cylinder.

5. The feeding device for tube laser cutting according to claim 4, characterized in that: An L-shaped support plate is connected between the two lower limit plates, and the L-shaped support plate is located in the branch pipe groove, with the pointed corner of the L-shaped support plate facing downward. The corner of the L-shaped support plate is rotatably connected to the inner wall of the lower limit plate through a pin shaft, and one side of the L-shaped support plate is aligned with the inclined surface of the material stop part. A servo cylinder is vertically provided on the frame, and the push rod of the servo cylinder is rotatably connected to the lower end surface of the L-shaped support plate close to the material stop part through a pin shaft.

6. The feeding device for tube laser cutting according to claim 4, characterized in that: The inner side wall of the inclined portion is slidably connected to a slider via a slide rail parallel to the inclined portion, a third push block perpendicular to the slider is fixed, a screw is rotatably provided on the inner side wall of the inclined portion via a connecting block and a bearing, the screw is connected to the slider via a screw nut, a second servo motor is provided on the frame, the second servo motor is connected to a second drive shaft parallel to the crossbeam via a reducer, and the second drive shaft is connected to the screw via a bevel gear set.

7. The feeding device for tube laser cutting according to claim 4, characterized in that: A base parallel to the frame is provided on one side, and the feeding mechanism is provided on the base. The feeding mechanism is provided with two, and the feeding mechanism includes a support plate with a U-shaped cross-section vertically provided on the base, and the front side of the support plate is slidably connected with an L-shaped plate with a horizontal part facing upward through a vertical slide rail, and a lifting cylinder is provided on the inner side of the support plate, and the top rod of the lifting cylinder is connected to the lower end surface of the horizontal part of the L-shaped plate, and the upper end surface of the horizontal part of the L-shaped plate is provided with a connecting plate, and the lower end surface of the connecting plate is fixed with two A side panel, one end of which is rotatably connected to the L-shaped panel via a pin shaft, a second servo cylinder is provided on the front of the vertical portion of the L-shaped panel, a push rod of the second servo cylinder is rotatably connected to the other end of the side panel via a pin shaft, an upper end surface of the side panel is slidably connected to a U-shaped panel via a slide rail, conveyor chains are provided on both sides of the U-shaped panel, the conveyor chains are driven by a third servo motor, a third servo cylinder parallel to the U-shaped panel is provided on the connecting plate, and a push rod of the third servo cylinder is connected to the side wall of the U-shaped panel.

8. The feeding device for tube laser cutting according to claim 7, characterized in that: The upper end surface of the base is slidably connected to a movable plate via a slide rail along its length direction, and the support plate of the feeding mechanism located on the left side is fixed on the upper end surface of the movable plate. The base is provided with a second rack along its length direction, and a driving motor is fixed to the movable plate. The output end of the driving motor is connected to a second gear meshing with the second rack, and a first push plate is fixed to the movable plate on the left side of the feeding mechanism through a bracket, and a second push plate is fixed to the right end of the base through a bracket.

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