Stretching mechanism of co-extrusion film blowing machine

Abstract

The utility model relates to the technical field of film blowing machines, and discloses a stretching mechanism of a co-extrusion film blowing machine, which comprises two symmetrically arranged support frames, support blocks are elastically arranged on the support frames, and stretching rollers are rotatably arranged on the support blocks; a pressure sensor connected with a control system is arranged on the supporting frame, and the pressure sensor can be triggered to work along with stretching and rolling of the thin film. An air cylinder is arranged on the inner side of the supporting block and controlled by the control system to be opened and closed, and a pressing plate extending to the position above the stretching roller is arranged at the telescopic end of the air cylinder. Limiting rollers are rotationally arranged on the portions, on the two sides of the stretching roller, of the supporting frame. According to the utility model, the probability that the film is snapped can be reduced, meanwhile, the film can be prevented from falling off from the stretching mechanism at the top end of the equipment after being fractured, convenience is provided for continuous transmission after subsequent rework, the working intensity is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of film blowing machines, in particular to a stretching mechanism of a co-extrusion film blowing machine. Background Art

[0002] The film blowing machine is a device that heats and melts plastic particles and then blows them into a film. After the film is blown out, it will go through multiple processes such as cooling, herringbone splinting, traction stretching, and winding. In the prior art, since the equipment is usually high, the blown film needs to be pulled and stretched upwards and then transported downwards for winding. In the process of pulling the blown film, due to the deviation between the coordination of various mechanisms or the failure of the system to correct the deviation in time, the film may break due to excessive tension. Once the film breaks, it will fall directly to the material extrusion and blowing station at the bottom. When resuming production, it is usually manually tied to the end of the broken film with a rope, and the film is driven up by pulling the rope, so that the film is reconnected to each station. Not only is the operation time-consuming and labor-intensive, but it is also difficult to control the lifting force, which can easily cause the film to break again, affecting work efficiency. Utility Model Content

[0003] The purpose of the utility model is to provide a stretching mechanism for a co-extrusion film blowing machine, which can not only reduce the probability of the film being broken, but also prevent the film from falling from the stretching mechanism at the top of the equipment after breaking, thereby facilitating the subsequent transfer after resuming work, reducing work intensity and improving work efficiency.

[0004] The utility model adopts the following technical solutions:

[0005] A stretching mechanism of a co-extrusion film blowing machine comprises two symmetrically arranged support frames, wherein a support block is elastically provided on the support frame, and a stretching roller is rotatably provided on the support block; wherein a pressure sensor connected to a control system is provided on the support frame, and the pressure sensor is triggered to work as the film is stretched and wound; a cylinder is provided on the inner side of the support block, and the cylinder is opened and closed by the control system, and a pressure plate extending to the top of the stretching roller is provided at the telescopic end of the cylinder; and limit rollers are rotatably provided on the support frames on both sides of the stretching roller.

[0006] Preferably, the support frame includes a horizontally arranged support transverse plate, and a vertically arranged support longitudinal plate at the top of the support transverse plate; a slide groove is provided on the support longitudinal plate in the vertical direction, and the support block is elastically arranged in the slide groove.

[0007] Preferably, a guide rod is provided at the top of the support block, and the top of the guide rod is movably passed through the slide groove and extends to the top of the support longitudinal plate; a buffer spring is provided on the outside of the guide rod located above the support longitudinal plate, and the bottom end of the buffer spring is connected to the pressure sensor, and the pressure sensor is a ring structure, and the pressure sensor is arranged at the top of the support longitudinal plate.

[0008] Preferably, a thread is provided at the top end of the guide rod, on which a nut is provided, and in an initial state, the top end of the buffer spring abuts against the bottom end of the nut.

[0009] Preferably, the bottom end of the pressing plate is an arc-shaped structure.

[0010] Preferably, the telescopic end of the cylinder is provided with a fixed block, and the pressing plate is arranged on the fixed block, wherein the pressing plate can be movably adjusted along the length direction of the stretching roller.

[0011] Preferably, a sliding rod is provided at one end of the pressure plate close to the fixed block, and the sliding rod is movable through the fixed block and the supporting block in turn; wherein a through groove is vertically provided on the supporting block for the sliding rod to move up and down, and a locking bolt is threadedly provided on the fixed block for positioning the sliding rod.

[0012] Preferably, the stretching roller is a structure with a hollow interior and through-holes at both ends, and the outside of the stretching roller is provided with air holes communicating with the inside of the stretching roller; and the support block is provided with a vacuum device communicating with the inside of the stretching roller.

[0013] Preferably, the limiting roller is adjustably arranged on the supporting transverse plate.

[0014] Preferably, an adjustment groove is opened on the supporting cross plate along its length direction, a mounting block is slidably arranged in the adjusting groove, and the limiting roller is rotatably arranged on the mounting block; an adjustment screw is rotatably arranged on one side of the supporting cross plate, and one end of the adjustment screw located in the adjusting groove is rotatably connected to the mounting block.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the utility model sets a pressure sensor connected to the control system between the support block and the support frame, and can set the threshold of the pressure sensor according to the strength of the film to be produced. When the support block drives the stretching roller to move elastically on the support frame, and the pressure generated on the pressure sensor is greater than the set threshold, the control system will control the equipment to shut down, thereby reducing the probability of the film being broken. By setting a cylinder on the support block, after the control system receives the alarm of the pressure sensor, it can control the cylinder to drive the pressure plate to press on the outside of the film while cutting off the power supply, preventing the film from breaking and slipping to the bottom extrusion and blowing station, reducing the subsequent work intensity and improving the subsequent work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0017] Figure 2 for Figure 1 A is an enlarged view of the middle image. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the present invention in conjunction with the accompanying drawings and embodiments:

[0019] like Figure 1 to Figure 2 As shown, a stretching mechanism of a co-extrusion film blowing machine described in the utility model comprises two symmetrically arranged support frames 1, on which support blocks 2 are elastically provided, and on which stretching rollers 3 are rotatably provided; wherein a pressure sensor 4 connected to a control system is provided on the support frame 1, and as the film is stretched and wound, the pressure sensor 4 is triggered to work, and the data transmitted to the pressure sensor 4 is compared with the setting data in the control system to determine whether shutdown processing is required; when the pressure generated during the film winding process is greater than the pressure threshold set in the control system, the control system will control the entire equipment to shut down for maintenance to reduce the probability of the film being broken; the pressure threshold in the control system is related to the strength of the film to withstand fracture, and is usually less than the maximum value that the film can withstand; the control system in this embodiment is a system for controlling the operation of the entire co-extrusion film blowing machine, and since such control systems are all prior art, and the connection control methods are well known to those skilled in the art, and the system does not belong to the scope of protection of this application, the connection structure of the system is not described in detail here.

[0020] A cylinder 5 connected to the air source is arranged on the inner side of the support block 2. The opening and closing of the cylinder 5 is controlled by the control system. A pressure plate 6 extending to the top of the stretching roller 3 is arranged at the telescopic end of the cylinder 5. When the control system controls the device to be closed, it will simultaneously control the cylinder 5 to be opened, so that the pressure plate 6 can press the surface of the stretching roller 3, thereby limiting the position of the film and preventing the film from falling to the bottom extrusion blowing station after accidentally breaking, thereby reducing the additional labor intensity during the subsequent resumption of work and improving the subsequent work efficiency. In addition, the bottom end of the pressure plate 6 is an arc-shaped structure, so as to cooperate with the stretching roller 3, and press the film that passes by the top of the stretching roller 3 onto the surface of the stretching roller 3. The telescopic end of the cylinder 5 is preferably provided with a fixed block 7, and a pressure plate 6 is arranged on the fixed block 7, wherein the pressure plate 6 can be movably adjusted along the length direction of the stretching roller 3 so as to match the pressing and positioning of films of different widths; specifically, a sliding rod 8 is arranged at one end of the pressure plate 6 close to the fixed block 7, and the sliding rod 8 is movable through the fixed block 7 and the support block 2 in turn; wherein a through groove 9 for the sliding rod 8 to move up and down is vertically arranged on the support block 2, so as to prevent the pressure plate 6 from driving the sliding rod 8 to move up and down and being hindered; in addition, a locking bolt 10 for positioning the sliding rod 8 is also threadedly arranged on the fixed block 7, so as to ensure the stability of the pressure plate 6 after the position is adjusted.

[0021] The support frames 1 on both sides of the stretching roller 3 are rotatably provided with limit rollers 11, which are used to limit the two sides of the film bypassing the stretching roller 3 to prevent the film from floating away from the stretching roller 3 during transportation, thereby ensuring subsequent stable winding.

[0022] Furthermore, the support frame 1 includes a horizontally arranged support transverse plate 1-1, and a vertically arranged support longitudinal plate 1-2 at the top of the support transverse plate 1-1; a slide groove 12 is opened on the support longitudinal plate 1-2 along the vertical direction, and the support block 2 is elastically arranged in the slide groove 12. A guide rod 13 is provided at the top of the support block 2, and the top of the guide rod 13 moves out of the slide groove 12 and extends to the top of the support longitudinal plate 1-2; a buffer spring 14 is provided on the outside of the guide rod 13 located above the support longitudinal plate 1-2, and the bottom end of the buffer spring 14 is connected to the annular pressure sensor 4, and the pressure sensor 4 is arranged at the top of the support longitudinal plate 1-2; when the film is stretched and rolled, it will generate downward pressure on the stretching roller 3, thereby driving the support block 2 to have a tendency to move downward along the slide groove 12. At this time, the buffer spring 14 will generate pressure on the pressure sensor 4. When the pressure here is less than the threshold value set in the control system, the equipment operates normally. When the pressure is greater than the threshold value in the control system, the control system will control the equipment to stop, and at the same time start the cylinder 5 to extend, and the pressure plate 6 will cover the top of the stretching roller 3 to prevent the film from breaking and falling off. In addition, in the present embodiment, a thread is provided at the top of the guide rod 13, on which a nut 15 is provided. In the initial state, the top of the buffer spring 14 abuts against the bottom of the nut 15, and the buffering amount of the buffer spring 14 can be adjusted by rotating the nut 15 to meet different usage requirements; wherein, when the nut 15 is rotated clockwise, the buffer spring 14 will be compressed, and at this time the buffer spring 14 will generate pressure on the pressure sensor 4. When setting the pressure threshold controlled by the control system, the increased value after the buffer spring 14 is compressed can be added to the original threshold to prevent the subsequent control system from being affected by the compression of the buffer spring 14 when starting and stopping the control device.

[0023] Furthermore, in the present embodiment, the stretching roller 3 is a structure with a hollow interior and through-holes at both ends, and the outside of the stretching roller 3 is provided with air holes 16 connected to the interior thereof; the support block 2 is provided with a vacuum device 17 connected to the interior of the stretching roller 3, and the vacuum device 17 can be a vacuum generator, which is used to connect with the control system; with such a configuration, when the pressure applied to the stretching roller 3 is greater than a set threshold, the control system can control the shutdown and at the same time start the vacuum generator to adsorb the film, so that the film is firmly adsorbed on the surface of the stretching roller 3 and in cooperation with the cylinder 5, further prevent the film from falling off.

[0024] Furthermore, in this embodiment, the limiting roller 11 is adjustably arranged on the supporting transverse plate 1-1, so as to fine-tune the distance between the limiting roller 11 and the stretching roller 3 according to different films; specifically, an adjustment slot 18 is provided on the supporting transverse plate 1-1 along its length direction, a mounting block 19 is slidably arranged in the adjustment slot 18, and the limiting roller 11 is rotatably arranged on the mounting block 19; an adjusting screw 20 is rotatably arranged on one side of the supporting transverse plate 1-1, and one end of the adjusting screw 20 located in the adjusting slot 18 is rotatably connected to the mounting block 19. By rotating the adjusting screw 20, the mounting block 19 can be pushed to move in the adjusting slot 18, thereby realizing the adjustment of the distance between the limiting roller 11 and the stretching roller 3.

[0025] In the utility model, the stretching mechanism is arranged at the top of the equipment, and the stretching roller 3 plays the role of reversing support, that is, the film goes around the stretching roller 3 upward from the lower right and then connects downward to the winding mechanism, and the limit rollers 11 on both sides are located on the side of the film away from each other, so as to provide limit for the transmission of the film rising and falling; specifically, when in use, as the film is rolled up, the pressure generated after the film is stretched will act on the stretching roller 3, at this time, the support block 2 tends to produce downward displacement, thereby generating pressure on the pressure sensor 4, and the pressure value generated by the pressure sensor 4 is transmitted to the control system and compared with the threshold value set in the control system, if the pressure value is less than the threshold value, the equipment works normally, if it is greater than the threshold value, it means that the pulling force is greater than the strength of the film, and the film is at risk of breaking, at this time, the control system controls the equipment to stop, and at the same time starts the cylinder 5 and the vacuum generator, the film will be adsorbed on the surface of the stretching roller 3, and at the same time the pressure plate 6 will also be pressed on the surface of the stretching roller 3, avoiding the risk of the film falling off to the initial work station after breaking; reducing the labor intensity of workers and improving work efficiency.

[0026] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A stretching mechanism for a co-extrusion film blowing machine, Features: It comprises two symmetrically arranged support frames, wherein a support block is elastically provided on the support frame, and a stretching roller is rotatably provided on the support block; wherein a pressure sensor connected to a control system is provided on the support frame, and the pressure sensor is triggered to work as the film is stretched and rolled up; a cylinder is provided on the inner side of the support block, and the opening and closing of the cylinder is controlled by the control system, and a pressure plate extending to the top of the stretching roller is provided at the telescopic end of the cylinder; and limit rollers are rotatably provided on the support frames on both sides of the stretching roller.

2. The stretching mechanism of the co-extrusion film blowing machine according to claim 1, Features: The support frame includes a horizontally arranged support transverse plate and a vertically arranged support longitudinal plate at the top of the support transverse plate; a slide groove is provided on the support longitudinal plate in the vertical direction, and the support block is elastically arranged in the slide groove.

3. The stretching mechanism of the co-extrusion film blowing machine according to claim 2, Features: A guide rod is provided at the top of the support block, and the top of the guide rod movably passes through the slide groove and extends to the top of the support longitudinal plate; a buffer spring is provided on the outside of the guide rod located above the support longitudinal plate, and the bottom end of the buffer spring is connected to the pressure sensor, which is a ring structure and is provided at the top of the support longitudinal plate.

4. The stretching mechanism of the co-extrusion film blowing machine according to claim 3, Features: The top end of the guide rod is provided with a section of thread, on which a nut is provided, and in an initial state, the top end of the buffer spring abuts against the bottom end of the nut.

5. The stretching mechanism of the co-extrusion film blowing machine according to claim 1, Features: The bottom end of the pressing plate is an arc-shaped structure.

6. The stretching mechanism of the co-extrusion film blowing machine according to claim 5, Features: The telescopic end of the cylinder is provided with a fixed block, and the pressing plate is arranged on the fixed block, wherein the pressing plate can be movably adjusted along the length direction of the stretching roller.

7. The stretching mechanism of the co-extrusion film blowing machine according to claim 6, Features: A sliding rod is provided at one end of the pressure plate close to the fixed block, and the sliding rod is movable through the fixed block and the supporting block in turn; wherein a through groove is vertically provided on the supporting block for the sliding rod to move up and down, and a locking bolt for positioning the sliding rod is threadedly provided on the fixed block.

8. The stretching mechanism of the co-extrusion film blowing machine according to claim 1, Features: The stretching roller is a structure with a hollow interior and two through ends. The outside of the stretching roller is provided with air holes communicating with the interior thereof. The support block is provided with a vacuum device communicating with the interior of the stretching roller.

9. The stretching mechanism of the co-extrusion film blowing machine according to claim 2, Features: The limiting roller is adjustably arranged on the supporting transverse plate.

10. The stretching mechanism of the co-extrusion film blowing machine according to claim 9, Features: The supporting transverse plate is provided with an adjustment groove along its length direction, a mounting block is slidably arranged in the adjusting groove, and the limiting roller is rotatably arranged on the mounting block; an adjustment screw is rotatably arranged on one side of the supporting transverse plate, and one end of the adjustment screw located in the adjusting groove is rotatably connected to the mounting block.

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