An automatic diameter-changing device for stepped cutting and flat cutting of a bag-making machine

Abstract

The present invention discloses a stepped cutting and flat cutting automatic diameter-changing device for a bag-making machine, which has a rotating shaft. A cavity is provided inside the rotating shaft, and a main shaft is arranged in the cavity. The main shaft is screwed with a screw rod. The device further includes a first cutter assembly and a second cutter assembly. One end of the first cutter assembly is hinged to one end of a first connecting rod, and the other end of the first connecting rod is hinged to one end of a second connecting rod through a transmission shaft. The other end of the second connecting rod is hinged to the second cutter assembly. The transmission shaft is fixed on the main shaft. A guiding groove for the transmission shaft to pass through is provided on the rotating shaft. The device further includes a clutch assembly, and the clutch assembly can realize the linkage or separation between the rotating shaft and the screw rod. The structure of the present invention is simple and the design is reasonable, and the diameter-changing adjustment of the cutter of the bag-making machine can be conveniently realized.

Description

Technical Field

[0001] The present invention relates to a bag making machine, and more particularly to a stepped cutting and flat cutting automatic diameter-changing device for a bag making machine. Background Art

[0002] A bag making machine is a special equipment for automatic production of packaging bags. One type of packaging bag is a valve bag, and stepped cutting and flat cutting are a process in the production of valve bags. The stepped cutting knife and the flat cutting knife are both installed on the corresponding knife plates. At present, the customer orders of valve bag production enterprises are generally of multiple varieties, small batches, and uncertain cylinder bag specifications. Frequent replacement of bag length specifications is the norm. To meet different requirements, the traditional method of changing specifications is achieved by manually disassembling and installing different specifications of knife plates, which is time-consuming and laborious, has a slow replacement speed, and there are many unstable factors, restricting the development of production efficiency. Summary of the Invention

[0003] In view of the deficiencies of the background art, the technical problem to be solved by the present invention is to provide a stepped cutting and flat cutting automatic diameter-changing device for a bag making machine to solve the above problems.

[0004] To this end, the present invention is implemented as follows:

[0005] A stepped cutting and flat cutting automatic diameter-changing device for a bag making machine, characterized in that: it has a rotating shaft, the inside of the rotating shaft has a cavity, a main shaft is arranged in the cavity, the main shaft is screwed with a screw rod, and further includes a first cutting knife assembly and a second cutting knife assembly. One end of the first cutting knife assembly is hinged to one end of a first connecting rod, the other end of the first connecting rod is hinged to one end of a second connecting rod through a transmission shaft, the other end of the second connecting rod is hinged to the second cutting knife assembly, the transmission shaft is fixed on the main shaft, the rotating shaft has a guiding groove for the transmission shaft to pass through, and further includes a clutch assembly, the clutch assembly can realize the linkage or separation of the rotating shaft and the screw rod, and a limiting component is arranged corresponding to the screw rod.

[0006] Three groups of the first connecting rod and the second connecting rod are evenly arranged.

[0007] The middle part of the first connecting rod is hinged to one end of a third connecting rod, the other end of the third connecting rod is hinged to one end of a fourth connecting rod, and the other end of the fourth connecting rod is hinged to the middle part of the second connecting rod.

[0008] The first cutting knife assembly includes a first knife seat, a first knife plate is arranged on the first knife seat, a stepped cutting knife and a flat cutting knife are installed on the first knife plate, the second cutting knife assembly includes a second knife seat, a second knife plate is arranged on the second knife seat, and a stepped cutting knife and a flat cutting knife are installed on the second knife plate.

[0009] The clutch assembly includes an end face gear disk connected to one end of the rotating shaft. A sliding sleeve is arranged on one side of the end face gear disk. The inner ring of the sliding sleeve meshes with the transmission gear. One end of the sliding sleeve has end face teeth that can mesh with the end face gear disk. A spring is tightly pressed between the transmission gear and the sliding sleeve. One end of the transmission gear extends to form a guide sleeve. The screw rod is key-connected to the guide sleeve. The guide sleeve, the sliding sleeve, and the gasket jointly enclose a ventilation space. An air passage communicating with the ventilation space is opened in the screw rod, and the air passage is connected to an air pump.

[0010] The limiting assembly includes a limiting hole circumferentially opened on one side of the sliding sleeve, and a limiting post that can be inserted into the limiting hole is arranged on one side of the limiting hole.

[0011] For a step cutting and flat cutting automatic variable diameter device of a bag making machine with the above technical solution, when normal cutting work is carried out, the screw rod and the rotating shaft are linked by controlling the clutch device. At this time, the main shaft only rotates self - cooperatively, and the connecting rod assembly no longer drives the two cutter assemblies to move. The cutter assemblies only rotate with the rotating shaft to perform cutting operations. When the bag making specification changes and the position of the cutter needs to be adjusted, the screw rod and the rotating shaft are separated by controlling the clutch position, and the rotating shaft, the main shaft, and the connecting rod assembly cooperate to adjust the positions of the two cutter assemblies, realizing the automatic adjustment of the cutter variable diameter. The operation is simpler, and the adjustment efficiency and accuracy are effectively improved. Brief Description of the Drawings

[0012] The present invention has the following drawings:

[0013] Figure 1 It is a schematic structural view of the contraction of the connecting rod assembly of the present invention;

[0014] Figure 2 It is a schematic structural view of the expansion of the connecting rod assembly of the present invention;

[0015] Figure 3 It is a cross - sectional view of the present invention;

[0016] Figure 4 It is Figure 3 A partial enlarged view at the position pointed by A in Detailed Description of the Embodiment

[0017] As shown in the figure, an automatic variable-diameter device for step cutting and flat cutting of a bag-making machine disclosed by the present invention has a rotating shaft 1, the rotating shaft 1 is connected to a synchronous pulley 12, and the synchronous pulley is in transmission connection with a corresponding motor. The inside of the rotating shaft 1 has a cavity, and a main shaft 15 is arranged in the cavity. The main shaft 15 is screwed with a screw 16. It also includes a first cutter assembly and a second cutter assembly. In this embodiment, the first cutter assembly includes a first tool holder 2, a first tool plate 3 is arranged on the first tool holder 2, and a step cutter 4 and a flat cutter 5 are installed on the first tool plate 3. The second cutter assembly includes a second tool holder 6, a second tool plate 7 is arranged on the second tool holder 6, and a step cutter and a flat cutter are installed on the second tool plate 7. One end of the first tool holder 2 of the first cutter assembly is hinged to one end of a first connecting rod 11, the other end of the first connecting rod 11 is hinged to one end of a second connecting rod 10 through a transmission shaft 14, and the other end of the second connecting rod 10 is hinged to the second tool holder 6 of the second cutter assembly. Further, three groups of the first connecting rod 11 and the second connecting rod 10 are evenly arranged, so that the forces on the first and second cutter assemblies are more balanced, and the stability of their actions is improved. The middle of the first connecting rod 11 is hinged to one end of a third connecting rod 8, the other end of the third connecting rod 8 is hinged to one end of a fourth connecting rod 9, and the other end of the fourth connecting rod 9 is hinged to the middle of the second connecting rod 10. By setting the third and fourth connecting rods for auxiliary transmission, the transmission of the connecting rod assembly can be made more stable, and the reliability of its actions can be ensured. The transmission shaft 14 is fixed on the main shaft 15, and the rotating shaft 1 has a guiding groove 13 for the transmission shaft 14 to pass through. It also includes a clutch assembly, and the clutch assembly can realize the linkage or separation of the rotating shaft 1 and the screw 16. In this embodiment, the clutch assembly includes a face gear disk 17 connected to one end of the rotating shaft 1. A sliding sleeve 19 is arranged on one side of the face gear disk 17. The inner ring of the sliding sleeve 19 is meshed with a transmission gear 20. One end of the sliding sleeve 19 has a face tooth 18 that can be meshed with the face gear disk 17. A spring 21 is tightly arranged between the transmission gear 20 and the sliding sleeve 19. One end of the transmission gear 20 extends to be provided with a guide sleeve 22, and the screw 16 is key-connected to the guide sleeve 22. The guide sleeve 22, the sliding sleeve 19 and a gasket 24 jointly enclose a ventilation space 23. An air passage 26 communicating with the ventilation space 23 is opened in the screw 16, and the air passage 26 is connected to an air pump. A limiting assembly is arranged corresponding to the screw 16. Specifically, the limiting assembly includes a limiting hole 27 opened around one side of the sliding sleeve 19, and a limiting column 25 that can be inserted into the limiting hole is arranged on one side of the limiting hole 27.

[0018] The working principle of the present invention is as follows: During normal cutting operation, the air pump injects high-pressure gas into the ventilation space 23 through the air passage 26 on the screw 16, and squeezes the sliding sleeve 19 to move, so that the end face teeth 18 on the sliding sleeve 19 mesh with the end face gear disk 17. At this time, the control rotating shaft 1 rotates, and drives the main shaft 15 to rotate synchronously through the transmission shaft 14. At the same time, the rotating shaft 1 is transmitted through the end face gear disk 17, the sliding sleeve 19, the transmission gear 20 and the guide sleeve 22, and drives the screw 16 to rotate. At this time, the main shaft 15 and the screw rotate at the same speed, the main shaft 15 does not move axially, and the connecting rod assembly does not act. The first and second cutter assemblies act with the rotation of the rotating shaft 1 to realize the cutting operation; When the bag-making specification changes, the air pump no longer injects high-pressure gas. At this time, the spring 21 will squeeze the sliding sleeve 19 to move, and the end face teeth 18 on the sliding sleeve 19 are separated from the end face gear disk 17. And with the movement of the sliding sleeve 19, the limiting column 25 will be inserted into the limiting hole 27 on the sliding sleeve 19 to limit the rotation of the sliding sleeve 19. Since the sliding sleeve 19 meshes with the transmission gear 20, it will also limit the rotation of the transmission gear 20, the guide sleeve 21 and the screw 16. At this time, only need to control the rotating shaft 1 to rotate an appropriate angle and synchronously drive the main shaft 15 to rotate a certain angle. Since the main shaft 15 is screwed to the screw 16, the main shaft 15 moves along the direction of the guide groove 14. When the main shaft 15 moves, it will drive the transmission shaft 14 to move, and then drive the first and second connecting rods to swing, drive the first and second tool holders to move, and then adjust the position of the cutter to meet the required bag-making specification.

[0019] With this structure of the present invention, automatic adjustment of the cutter diameter can be achieved, the operation is simpler, and the adjustment efficiency and accuracy are effectively improved.

Claims

1. An automatic diameter-changing device for stepped cutting and flat cutting of a bag-making machine, characterized in that: It has a rotating shaft (1) with a cavity inside. A main shaft (15) is arranged in the cavity. The main shaft (15) is screwed to a screw rod (16). It also includes a first cutter assembly and a second cutter assembly. The first cutter assembly is hinged to one end of a first connecting rod (11). The other end of the first connecting rod (11) is hinged to one end of a second connecting rod (10) through a transmission shaft (14). The other end of the second connecting rod (10) is hinged to the second cutter assembly. The transmission shaft (14) is fixed on the main shaft (15). The rotating shaft (1) has a guiding groove (13) for the transmission shaft (14) to pass through. It further includes a clutch assembly which can realize the linkage or separation between the rotating shaft (1) and the screw rod (16). A limiting assembly is provided corresponding to the screw rod (16). The first cutter assembly includes a first cutter base (2). A first cutter plate (3) is arranged on the first cutter base (2). A stepped cutter (4) and a flat cutter (5) are installed on the first cutter plate (3). The second cutter assembly includes a second cutter base (6). A second cutter plate (7) is arranged on the second cutter base (6). A stepped cutter and a flat cutter are installed on the second cutter plate (7). The clutch assembly includes an end face gear disk (17) connected to one end of the rotating shaft (1). A sliding sleeve (19) is arranged on one side of the end face gear disk (17). The inner ring of the sliding sleeve (19) meshes with a transmission gear (20). One end of the sliding sleeve (19) has an end face tooth (18) that can mesh with the end face gear disk (17). A spring (21) is tightly arranged between the transmission gear (20) and the sliding sleeve (19). One end of the transmission gear (20) extends to be provided with a guide sleeve (22). The screw rod (16) is key-connected to the guide sleeve (22). The guide sleeve (22), the sliding sleeve (19) and a gasket (24) jointly enclose a ventilation space (23). An air passage (26) communicating with the ventilation space (23) is opened in the screw rod (16). The air passage (26) is connected to an air pump. The limiting assembly includes a limiting hole (27) opened around one side of the sliding sleeve (19). A limiting column (25) that can be inserted into the limiting hole is arranged on one side of the limiting hole (27).

2. The step cutting and flat cutting automatic diameter-changing device for a bag-making machine according to claim 1, characterized in that Three groups of the first connecting rod (11) and the second connecting rod (10) are evenly arranged.

3. The stepped cutting and flat cutting automatic diameter-changing device for a bag-making machine according to claim 1, wherein The middle part of the first connecting rod (11) is hinged to one end of a third connecting rod (8). The other end of the third connecting rod (8) is hinged to one end of a fourth connecting rod (9). The other end of the fourth connecting rod (9) is hinged to the middle part of the second connecting rod (10).

Images