Tensioning device of bag making machine

Abstract

The utility model discloses a tensioning device of a bag making machine. Comprising two fixing plates, the opposite sides of the two fixing plates are both connected with concentrically-arranged rotating shafts, the two rotating shafts are both rotationally connected with swing arms, each swing arm comprises a linkage section and a swing section, a tensioning roller is connected between the two swing sections, each linkage section is connected with an elastic assembly, and each elastic assembly is connected with a tensioning roller. The belt material tensioning device has the following advantages and effects that the belt material tensioning adjustment can be realized, and the belt material tensioning device is simple in structure, low in maintenance cost and high in reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of bag making machines, and particularly relates to a tensioning device for a bag making machine. Background Technique

[0002] A bag making machine is a machine used to manufacture various plastic bags or packaging bags made of other materials, and is widely used in the production of packaging bags made of various materials such as plastics and papers.

[0003] The tensioning device in a bag making machine is an important component of the bag making machine. The tensioning device is usually arranged in the winding part and the unwinding part of the bag making machine. By setting the tensioning device, the tension of the strip material in the winding part and the unwinding part is controlled to ensure that the strip material will not be too tight or too loose during the winding process and the unwinding process, effectively avoiding the problem that the strip material is damaged due to too tight or too loose tension. Now, a tensioning device different from the existing structure is proposed. Based on the above description, the present invention is born. Content of the Utility Model

[0004] The purpose of the utility model is to provide a tensioning device for a bag making machine, which can realize the tension adjustment of the strip material, and has the advantages of simple structure, low maintenance cost and high reliability.

[0005] The above technical purpose of the utility model is achieved by the following technical solutions: it includes two fixing plates, concentrically arranged rotating shafts are connected to the opposite sides of the two fixing plates, swing arms are rotatably connected to the two rotating shafts, the swing arms include a linkage section and a swinging section, a tensioning roller is connected between the two swinging sections, elastic components are connected to each linkage section, a synchronizing rod is connected between the two elastic components, and a stroke cylinder is connected to the synchronizing rod.

[0006] By adopting the above technical solutions, the multi-stroke cylinder has multi-stroke position adjustment. By changing the position of the stroke cylinder, the angle of the tensioning section is changed, so as to realize the tension adjustment of the tensioning roller on the strip material; the setting of the synchronizing rod realizes the synchronous control of the two swing arms, can reduce the energy consumption of the device, reduce the influence of the synchronous control on the two swing arms, thereby enhancing the stability of the tensioning device, and has the advantages of simple structure, low maintenance cost and high reliability.

[0007] It is further set that: each of the elastic components includes a connecting rod connected to the synchronizing rod and slidingly matched with the linkage section through the connecting rod, a pressing spring sleeved on the connecting rod and located on both sides of the linkage section, and an adjusting nut threadedly connected to the connecting rod to drive the pressing spring, and the synchronizing rod is hinged to the connecting rod.

[0008] By adopting the above technical solution, the hard pressing force of the tension roller on the strip material will cause the strip material to be easily stretched and rubbed. Excessive friction will generate heat, thereby affecting the quality of the strip material. The setting of the pressing spring can provide a flexible pressing force within a certain range, effectively alleviating the hard pressing within a certain range on the strip material, thereby avoiding the stretching and friction of the strip material caused by hard pressing, and thus improving the production quality of the strip material; the pressing spring can also slow down the vibration caused by the strip material, thereby strengthening the stable operation of the strip material; by turning the adjusting nut, the fine adjustment of the pressing force of the tension roller on the strip material within a certain range can be increased or decreased, thereby better improving the production quality of the strip material.

[0009] It is further set that: the tension roller is provided with an inner cavity, a blower disposed in the inner cavity, and an air outlet and an air inlet communicating with the outside are opened in the inner cavity.

[0010] By adopting the above technical solution, when the friction between the rotating roller and the strip material is too large, it will cause the strip material to generate heat during operation, thereby causing the strip material to be deformed by heat, thereby affecting the quality of the strip material. Through the principle of air convection by the blower, the inner cavity is always in a negative pressure state, forming a suction force, continuously sucking the air outside the cavity from the air inlet, and discharging the hot air conducted by the tension roller from the air outlet out of the inner cavity, achieving the effect of cooling. Its structure is simple and the manufacturing cost is low.

[0011] It is further set that: a plurality of heat conduction sheets are arranged at intervals along the length direction of the tension roller in the inner cavity, and each heat conduction sheet is provided with a heat dissipation channel.

[0012] By adopting the above technical solution, the heat dissipation fin is a large-area metal sheet. By increasing the contact area between the air and the heat dissipation fin, the heat dissipation effect is enhanced. The heat is transferred to the heat dissipation fin through heat conduction, and then the heat is taken away by the rotation of the blower, so as to more effectively reduce the temperature and greatly improve the production quality of the strip material.

[0013] It is further set that: it includes support frames arranged on both sides of the fixing plate, and a disassembly and assembly structure is provided between each support frame and the fixing plate. Each disassembly and assembly structure includes a fixing hole opened in the support frame, a threaded groove opened on one side of the fixing plate facing the fixing hole, and a fixing handle that sequentially passes through the fixing hole and is threadedly connected to the threaded groove.

[0014] By adopting the above technical solution, without the use of other disassembly and assembly tools, it can be quickly disassembled and assembled through the fixing handle, which helps to shorten the disassembly and assembly period and reduce the time cost of disassembly and assembly.

[0015] Further set as: between the two fixed handles corresponding to the two support frames, a loosening prevention structure is provided, the loosening prevention structure includes a ratchet wheel provided on the outer side of the support frame and connected to the fixed handle, and a pawl rotatably provided on the outer side of the support frame. When the fixed handle is tightened, the pawl meshes with the ratchet wheel.

[0016] By adopting the above technical solution, since mechanical vibration will easily cause the rotation and loosening of the threads of the fixed handle, thereby causing the fixed handle to lose its fixing force, which will lead to the loosening of the tensioning mechanism. Through the setting of the loosening prevention structure, it can prevent the reverse rotation of the fixed handle in the tightening direction caused by mechanical vibration, so as to achieve the effect of preventing loosening. The structure is simple, the maintenance cost is low, and the reliability is high. Description of the Drawings

[0017] Figure 1 is a schematic diagram of the overall structure of this embodiment; Figure 2 is a schematic diagram of the partial structure of this embodiment;

[0018] Figure 3 is a cross-sectional view of the tensioning roller of this embodiment;

[0019] Figure 4 is a cross-sectional view of the disassembly and assembly structure of this embodiment;

[0020] In the figure: 1, fixed plate; 11, rotating shaft; 12, swing arm; 13, linkage section; 14, swinging section; 15, tensioning roller; 16, elastic component; 17, synchronous rod; 18, stroke cylinder; 19, connecting rod; 20, abutting spring; 21, adjusting nut; 22, inner cavity; 23, blower; 24, air outlet; 25, air inlet; 26, heat conducting sheet; 27, heat dissipation channel; 28, support frame; 29, disassembly and assembly structure; 30, fixing hole; 31, thread groove; 32, fixed handle; 33, loosening prevention structure; 34, ratchet wheel; 35, pawl; 36, ratchet groove. Detailed Description of the Specific Embodiment

[0021] The following further describes the present invention in detail with reference to the accompanying drawings.

[0022] Referring to FIGS. 1 to 4, a tensioning device for a bag-making machine includes two fixing plates 1. On one side of the two fixing plates 1 facing each other, concentrically arranged rotating shafts 11 are fixedly connected. Both of the two rotating shafts 11 are rotatably connected with swing arms 12. Each of the two swing arms 12 includes a linkage section 13 and a swinging section 14. A tensioning roller 15 is fixedly connected between the two swinging sections 14. An elastic component 16 is fixedly connected to each linkage section 13. A synchronous rod 17 is hinged between the two elastic components 16, and a stroke cylinder 18 is fixedly connected to the synchronous rod 17. Each elastic component 16 includes a connecting rod 19 that is hinged to the synchronous rod 17 and slides through the linkage section 13 in a sliding fit, a pressing spring 20 sleeved on the connecting rod 19 and located on both sides of the linkage section 13, and an adjusting nut 21 threadedly connected to the connecting rod 19 to drive the pressing spring 20. The other end of the synchronous rod 17 facing the elastic component 16 and located at the middle position in the length direction of the synchronous rod 17 is connected to the piston rod of the stroke cylinder 18.

[0023] The tensioning roller 15 is provided with an inner cavity 22 along the length direction of the tensioning roller 15, a blower 23 fixedly arranged at the middle position of the inner cavity 22, an exhaust port 24 and an air inlet 25 communicating with the outside are opened in the inner cavity 22. A plurality of heat conducting sheets 26 are arranged at intervals along the length direction of the tensioning roller 15 in the inner cavity 22 and are fixedly arranged in the inner cavity 22. Each heat conducting sheet 26 is provided with a heat dissipation channel 27. The exhaust port 24 and the air inlet 25 are separately arranged at both ends of the tensioning roller 15 in the length direction.

[0024] It includes support frames 28 arranged on both sides of the two fixing plates 1. An assembly and disassembly structure 29 is provided between each support frame 28 and the fixing plate 1. Each of the assembly and disassembly structures 29 includes a fixing hole 30 opened in the support frame 28, a threaded groove 31 opened on one side of the fixing plate 1 facing the fixing hole 30, and a fixing handle 32 that sequentially passes through the fixing hole 30 and is threadedly connected to the threaded groove 31. A loosening prevention structure 33 is arranged between the two fixing handles 32 corresponding to the two support frames 28. The loosening prevention structure 33 includes a ratchet 34 arranged on the outer side of the support frame 28 and fixedly connected to the fixing handle 32, and a pawl 35 rotatably arranged on the outer side of the support frame 28. When the fixing handle 32 is tightened, the pawl 35 meshes with the ratchet 34.

[0025] This specific embodiment is only an interpretation of the present utility model and does not limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment that do not contribute creatively, but as long as it is within the scope of the claims of the present utility model, it is protected by the patent law.

Claims

1. A bag making machine tensioning device, characterized in that: The invention comprises two fixed plates (1), the two fixed plates (1) are connected to a concentrically arranged rotating shaft (11) on one side facing each other, the two rotating shafts (11) are rotatably connected to a swing arm (12), the swing arm (12) comprises a linkage section (13) and a swing section (14), a tension roller (15) is connected between the two swing sections (14), each linkage section (13) is connected to an elastic component (16), a synchronization rod (17) is connected between the two elastic components (16), and a travel cylinder (18) is connected to the synchronization rod (17).

2. The bag making machine tensioning device according to claim 1, characterized in that: Each of the elastic components (16) comprises a connecting rod (19) connected to the synchronization rod (17) and passing through the linkage section (13) to slide with the connecting rod, a clamping spring (20) sleeved on the connecting rod (19) and located on both sides of the linkage section (13), and an adjusting nut (21) threadedly connected to the connecting rod (19) to drive the clamping spring (20), and the synchronization rod (17) is hinged to the connecting rod (19).

3. The bag making machine tensioning device according to claim 1, characterized in that: The tensioning roller (15) is provided with an inner cavity (22), a fan (23) arranged in the inner cavity (22), and an air outlet (24) and an air inlet (25) communicating with the outside are provided in the inner cavity (22).

4. The bag making machine tensioning device according to claim 3, characterized in that: A plurality of heat-conducting plates (26) are arranged in the inner cavity (22) at intervals along the length direction of the tensioning roller (15), and each heat-conducting plate (26) is provided with a heat dissipation channel (27).

5. The bag making machine tensioning device according to claim 1, characterized in that: It comprises support frames (28) arranged on both sides of a fixing plate (1), and each disassembly and assembly structure (29) comprises a fixing hole (30) opened on the support frame (28), a thread groove (31) opened on one side of the fixing plate (1) facing the fixing hole (30), and a fixing handle (32) passing through the fixing hole (30) and being threadedly connected to the thread groove (31) in sequence.

6. The bag making machine tensioning device according to claim 5, characterized in that: An anti-loosening structure (33) is arranged between the two fixed handles (32) corresponding to the two support frames (28), and the anti-loosening structure (33) includes a ratchet (34) arranged on the outside of the support frame (28) and connected to the fixed handle (32) and a pawl (35) rotatably arranged on the outside of the support frame (28). When the fixed handle (32) is tightened, the pawl (35) engages with the ratchet (34).

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