A plastic wire splitting device

Abstract

The present invention discloses a plastic wire splitting device, which is installed on a plastic wire drawing machine for splitting plastic films. The device includes a wire splitting roller installed on the frame of the plastic wire drawing machine, and multiple wire splitting knives are arranged on the wire splitting roller. A front guiding roller is installed at the film inlet end of the wire splitting roller, and a rear guiding roller is installed at the wire outlet end. At least one of the front guiding roller and the rear guiding roller is an eccentric roller. The device includes at least one driving mechanism, which drives the eccentric roller to rotate. The rotation speed of the eccentric roller matches the moving speed of the plastic film, avoiding the problems in the background art such as insufficient friction of the eccentric roller resulting in poor operation or inability to rotate, excessive friction leading to excessive stretching of the plastic film, and relative sliding between the surface of the eccentric roller and the surface of the plastic film, which damages the surface of the plastic film.

Description

Technical Field

[0001] The present invention belongs to the technical field of plastic wire drawing devices, and more specifically relates to a plastic wire splitting device. Background Art

[0002] The production process of plastic woven belts is to use plastic raw materials to extrude films, cut them, and unidirectionally stretch them into flat filaments, and then use a circular loom to weave them into products, generally called woven bags. In the prior art, a wire splitting device is used for film cutting. During the production process, the just-extruded and formed film passes through a cooling water tank, a water squeezing device, a water absorbing device, and a film lifting device in sequence and then enters the wire splitting device. The rear end of the wire splitting device is provided with a wire drawing and traction device. In the prior art, the wire splitting knife of the wire splitting device is fixed and does not move, and wire splitting is achieved by the movement of the film. This results in a fixed wire splitting point of the wire splitting knife. After working for a long time, the wire splitting knife will heat up due to friction. Firstly, the film filaments will be burned off because the temperature of the wire splitting knife is too high. Secondly, the wire splitting point of the wire splitting knife will be worn, the cutting edge will be dulled, and the other positions of the wire splitting knife are not utilized, resulting in waste.

[0003] A plastic filament splitting machine with the application number 201220146775.6 is installed on a plastic wire drawing machine for splitting plastic films. It includes a filament splitting roller installed on the frame of the plastic wire drawing machine, and multiple filament splitting knives are provided on the filament splitting roller. A front guiding roller is installed at the film inlet end of the filament splitting roller, and a rear guiding roller is installed at the wire outlet end. At least one of the front guiding roller and the rear guiding roller is an eccentric roller. The plastic filament splitting machine of the present invention has a simple structure and is easy to manufacture. By using an eccentric roller to drive the film to move up and down, the utilization rate of the cutting edge of the filament splitting knife is improved, heat dissipation is facilitated, local wear of the filament splitting knife is reduced, and the service life is extended. Although it can solve the technical problems existing in the background technology in principle, the problems it has are as follows: 1. Both the front guiding roller or the rear guiding roller rely on the friction force with the film to drive its rotation when contacting the film. Since the weight of the eccentric roller is relatively large, when the center of gravity of the eccentric roller rotates to the lower half week of the eccentric roller, a large amount of force is required to rotate it to the upper half week. Then, if the film tension is adjusted to be small, the surface friction force with the eccentric roller is surely insufficient to drive the eccentric roller to rotate, and it is difficult to drive the plastic film to swing up and down, so the problem of tool wear cannot be improved. If the film tension is adjusted to be large, although it can meet the requirement of driving the eccentric roller to rotate, it will surely cause the film to be overstretched, resulting in damage or unqualified thickness. 2. There is also a problem that the force required for the center of gravity of the eccentric roller to rotate from the upper half week to the lower half week is small, while the driving force required for it to rotate from the lower half week to the upper half week will increase, which will cause the film tension to change periodically. On the one hand, it will cause the film to be uneven in thickness at intervals, and on the other hand, it will have an adverse impact on the subsequent processes. 3. Due to the structure of the eccentric roller, the surface of the eccentric roller does not rotate synchronously with the film, which will cause relative sliding between the surface of the eccentric roller and the film. Then, the relative sliding will surely cause local wear or scratches on the surface of the film, resulting in poor product quality. Summary of the Invention

[0004] The purpose of the present invention is to provide a plastic filament splitting device, which aims to overcome the technical problems existing in the background technology.

[0005] To solve the above technical problems, the purpose of the present invention is achieved as follows:

[0006] A plastic filament splitting device is installed on a plastic wire drawing machine for splitting plastic films. It includes a filament splitting roller installed on the frame of the plastic wire drawing machine, and multiple filament splitting knives are provided on the filament splitting roller. A front guiding roller is installed at the film inlet end of the filament splitting roller, and a rear guiding roller is installed at the wire outlet end. At least one of the front guiding roller and the rear guiding roller is an eccentric roller, and it includes at least one driving mechanism. The driving mechanism drives the eccentric roller to rotate, and the rotation speed of the eccentric roller matches the moving speed of the plastic film.

[0007] Based on the above solution and as a preferred solution to the above solution: The eccentric roller includes a first roller body and a drive shaft. The first roller body is sleeved outside the drive shaft. The first roller body and the drive shaft are eccentrically arranged and rotate relative to each other. The drive shaft is connected to the output end of the drive mechanism so that the drive mechanism drives the drive shaft to rotate. The outer roller surface of the first roller body contacts the plastic film.

[0008] Based on the above solution and as a preferred solution to the above solution: The drive shaft includes an eccentric section, and the first roller body is sleeved outside the eccentric section.

[0009] Based on the above solution and as a preferred solution to the above solution: A bearing is provided between the outer peripheral surface of the eccentric section and the inner peripheral surface of the first roller body.

[0010] Based on the above solution and as a preferred solution to the above solution: The drive shaft is key-connected to the inner ring of the bearing.

[0011] Based on the above solution and as a preferred solution to the above solution: It further includes an eccentric bearing. The inner ring of the eccentric bearing is sleeved outside the drive shaft, and the first roller body is sleeved outside the outer ring of the eccentric bearing.

[0012] Based on the above solution and as a preferred solution to the above solution: The eccentric bearings are located at both ends of the first roller body.

[0013] Based on the above solution and as a preferred solution to the above solution: The drive shaft is key-connected to the inner ring of the eccentric bearing.

[0014] The prominent and beneficial technical effects of the present invention compared with the prior art are as follows: 1. The eccentric roller and the plastic film rotate synchronously, without relying on the friction between the eccentric roller and the plastic film to drive the rotation of the eccentric roller, avoiding the problems in the background art such as insufficient friction of the eccentric roller resulting in poor operation or inability to rotate, excessive friction causing excessive stretching of the plastic film, and relative sliding between the surface of the eccentric roller and the surface of the plastic film damaging the surface of the plastic film.

[0015] 2. The eccentric roller is set as a split first roller body and drive shaft, and the two rotate relative to each other, which greatly reduces the weight of the first roller body. Then it can rotate easily under the drive of a very small friction force between the plastic film and the first roller body, further completely solving the problem of relative sliding between the plastic film and the surface of the eccentric roller damaging the surface of the plastic film.

[0016] 3. The setting of the bearing greatly reduces the resistance when the first roller body rotates, making its rotation easier, further reducing the requirement for the friction force between the plastic film and the first roller body, and being more conducive to flexibly adjusting the tension of the plastic film within a larger range according to the material and thickness of the plastic film during actual production.

[0017] 4. The setting of the eccentric bearing enables the drive shaft to be directly set as a straight shaft with a constant diameter, without the need to set an eccentric section structure, which is also the difference between this embodiment and Embodiment 3. Then, the use of the eccentric bearing directly achieves the effect of setting the eccentric section in Embodiment 3, greatly simplifying the structure of the drive shaft, the processing technology and the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is a left view of the overall structure of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments. Apparently, the described embodiments are only a part of the embodiments of the present application, rather than all of them. Based on the given embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0021] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0022] In the description of the present application, terms such as "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features.

[0023] Based on the many problems existing in the background technology, the present application overcomes the above problems through further improvement. The specific technical solution is as follows:

[0024] Embodiment 1

[0025] A plastic wire splitting device is installed on a plastic wire drawing machine for splitting a plastic film 70. It includes a wire splitting roller 20 installed on the frame 50 of the plastic wire drawing machine. Multiple wire splitting knives 30 are provided on the wire splitting roller 20. A front guiding roller 10 is installed at the film inlet end of the wire splitting roller 20, and a rear guiding roller 40 is installed at the wire outlet end. At least one of the front guiding roller 10 and the rear guiding roller 40 is an eccentric roller. It includes at least one driving mechanism 80 that drives the eccentric roller to rotate, and the rotation speed of the eccentric roller matches the moving speed of the plastic film 70. Thus, the synchronous rotation of the eccentric roller and the plastic film is achieved, and there is no need to rely on the friction between the eccentric roller and the plastic film to drive the rotation of the eccentric roller, avoiding the problems in the background technology such as insufficient friction of the eccentric roller resulting in poor operation or inability to rotate, excessive friction causing excessive stretching of the plastic film, and relative sliding between the surface of the eccentric roller and the surface of the plastic film damaging the surface of the plastic film.

[0026] It should be noted that in this embodiment, the driving mechanism includes a motor, and the power of the motor is transmitted to the eccentric shaft through chain drive, gear drive or belt drive.

[0027] Embodiment 2

[0028] The difference from Embodiment 1 is that the eccentric roller includes a first roller body 41 and a driving shaft 42. The first roller body 41 is sleeved outside the driving shaft 42. The first roller body 41 and the driving shaft 42 are eccentrically arranged and rotate relative to each other. The driving shaft 42 is connected to the output end of the driving mechanism to make the driving mechanism drive the driving shaft 42 to rotate. The outer roller surface of the first roller body 41 contacts the plastic film.

[0029] In Embodiment 1, the driving mechanism drives the eccentric roller to rotate. Although it can avoid relative sliding between the surface of the eccentric roller and the plastic film to a certain extent, due to the eccentricity problem, the linear velocity of the part far from the axis of the eccentric roller is greater than that of the part close to the axis, and there will still be a certain degree of surface sliding. In this embodiment, the eccentric roller is set as a split first roller body 41 and driving shaft 42, and the two rotate relative to each other, which greatly reduces the weight of the first roller body 41. Then, it can rotate easily under the drive of a very small friction force between the plastic film and the first roller body 41, further completely solving the problem of relative sliding between the surface of the plastic film and the eccentric roller damaging the surface of the plastic film.

[0030] Embodiment 3

[0031] On the basis of the second embodiment, there is a further improvement: the drive shaft 42 includes an eccentric section. The first roller body 41 is sleeved outside the eccentric section. The two ends of the eccentric section extend out connection ends for movably mounting the drive shaft 42 on the plastic wire drawing machine frame 50 and connecting to the output end of the drive mechanism 80 to achieve power transmission and drive the drive shaft 42 to rotate. Further preferably, a bearing 43 is provided between the outer peripheral surface of the eccentric section and the inner peripheral surface of the first roller body 41. The inner ring of the bearing 43 is sleeved outside the drive shaft 42, and the first roller body 41 is sleeved outside the outer ring of the bearing 43. It should be noted that the bearing in this embodiment is not an eccentric bearing. Further preferably, the drive shaft 42 is key-connected to the inner ring of the bearing. In this embodiment, the setting of the bearing greatly reduces the resistance when the first roller body 41 rotates, making it easier to rotate, further reducing the requirement for the frictional force between the plastic film and the first roller body, and being more conducive to more flexible adjustment of the plastic film tension in a wider range according to the plastic film material and thickness during actual production.

[0032] Embodiment Four

[0033] The difference between this embodiment and the third embodiment is that the bearing is an eccentric bearing. The inner ring of the eccentric bearing is sleeved outside the drive shaft 42, and the first roller body 41 is sleeved outside the outer ring of the eccentric bearing. Among them, it is preferred that the eccentric bearing is located at both ends of the first roller body 41 so that both ends of the first roller body 41 are well supported. In addition, it is preferred that the drive shaft 42 is key-connected to the inner ring of the eccentric bearing. Of course, due to the setting of the eccentric bearing, the drive shaft can be directly set as a straight shaft with equal diameter without setting an eccentric section structure, which is also the difference between this embodiment and the third embodiment. Then the use of the eccentric bearing directly achieves the effect of setting the eccentric section in the third embodiment, greatly simplifying the structure of the drive shaft, the processing technology and the production cost.

[0034] The above embodiments are only preferred embodiments of the present invention and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A plastic wire splitting device, which is installed on a plastic wire drawing machine for splitting a plastic film (70), includes a wire splitting roller (20) installed on the frame (50) of the plastic wire drawing machine. A plurality of wire splitting knives (30) are provided on the wire splitting roller (20). A front guiding roller (10) is installed at the film inlet end of the wire splitting roller (20), and a rear guiding roller (40) is installed at the wire outlet end. At least one of the front guiding roller (10) and the rear guiding roller (40) is an eccentric roller. It is characterized in that: It includes at least one driving mechanism (80), and the driving mechanism (80) drives the eccentric roller to rotate, and the rotation speed of the eccentric roller matches the moving speed of the plastic film (70); The eccentric roller is separately provided and includes a first roller body (41) and a driving shaft (42). The first roller body (41) is sleeved outside the driving shaft (42). The first roller body (41) and the driving shaft (42) are eccentrically arranged and rotate relative to each other. The driving shaft (42) is connected to the output end of the driving mechanism so that the driving mechanism drives the driving shaft (42) to rotate. The outer roller surface of the first roller body (41) contacts the plastic film; The first roller body (41) and the driving shaft (42) are connected by a bearing; The driving shaft (42) includes an eccentric section, and the first roller body (41) is sleeved outside the eccentric section; A bearing is provided between the outer peripheral surface of the eccentric section and the inner peripheral surface of the first roller body (41); 2. The plastic wire splitting device according to claim 1, characterized in that: The driving shaft (42) is key-connected to the inner ring of the bearing; 3. A plastic wire splitting device is installed on a plastic wire drawing machine for splitting a plastic film (70). It includes a wire splitting roller (20) installed on the frame (50) of the plastic wire drawing machine. Multiple wire splitting knives (30) are provided on the wire splitting roller (20). A front guiding roller (10) is installed at the film inlet end of the wire splitting roller (20), and a rear guiding roller (40) is installed at the wire outlet end. At least one of the front guiding roller (10) and the rear guiding roller (40) is an eccentric roller. It is characterized in that: It includes at least one driving mechanism (80), and the driving mechanism (80) drives the eccentric roller to rotate, and the rotation speed of the eccentric roller matches the moving speed of the plastic film (70); The eccentric roller is separately provided and includes a first roller body (41) and a driving shaft (42). The first roller body (41) is sleeved outside the driving shaft (42). The first roller body (41) and the driving shaft (42) are eccentrically arranged and rotate relative to each other. The driving shaft (42) is connected to the output end of the driving mechanism so that the driving mechanism drives the driving shaft (42) to rotate. The outer roller surface of the first roller body (41) contacts the plastic film; The first roller body (41) and the driving shaft (42) are connected by a bearing; The bearing is an eccentric bearing. The inner ring of the eccentric bearing (43) is sleeved outside the driving shaft (42), and the first roller body (41) is sleeved outside the outer ring of the eccentric bearing; 4. The plastic wire splitting device according to claim 3, wherein: The eccentric bearing is located at both ends of the first roller body (41); 5. The plastic wire splitting device according to claim 3, wherein: The driving shaft (42) is key-connected to the inner ring of the eccentric bearing;

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