A deviation correction device and method for PE film

Abstract

The present invention discloses a deflection correction device and method for PE film. The deflection correction device includes a retractable roller and a traction roller, a deflection correction roller disposed between the retractable roller and the traction roller, a deflection correction mechanism, a deflection correction sensor, and a controller. The lower end of the deflection correction roller contacts the PE film to tension the PE film. The deflection correction sensor is disposed at the front or rear end of the deflection correction roller. The deflection correction mechanism includes a horizontal telescopic assembly and a vertical telescopic assembly. The horizontal telescopic assembly is used to drive the deflection correction roller to move laterally to correct the deflection of the PE film, and the vertical telescopic assembly is used to drive the deflection correction roller downward to exert greater tension on the PE film at the deflection correction roller during the deflection correction process. The deflection correction sensor, the horizontal telescopic assembly, and the vertical telescopic assembly are all electrically connected to a controller. The controller determines whether to activate the horizontal telescopic assembly and the vertical telescopic assembly based on a detection signal received from the deflection correction sensor. The present invention solves the problem that existing deflection correction devices cause the PE film to not move synchronously with the traction roller.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and in particular to a deviation correction device and method applied to PE films. Background Art

[0002] The PE film production process involves using a film blowing machine to form the film. The formed PE film is then reeled up by a transmission mechanism. The transmission mechanism typically includes a traction roller and a reel-up roller, which work together to reel the PE film onto the reel-up roller and form a roll.

[0003] Deviation is inevitable during the traction process, which causes the PE film to shift laterally (perpendicular to the traction method) during transmission. If the deviation of the PE film is not corrected, the deviation will become larger and larger. Therefore, in order to avoid the deviation of the PE film during transmission, a correction device needs to be designed to correct the deviation of the PE film.

[0004] Patent announcement CN206106366U discloses an automatic deviation correction device for PE film in a film blowing machine. The principle of its deviation correction can be summarized as follows: a deviation correction sensor is designed between the traction roller and the retracting roller to sense whether the PE film is deflected, and the traction roller is installed on a laterally movable platform. When the deviation correction sensor senses that the PE film is deflected, the PLC controller controls the telescopic cylinder to drive the laterally movable platform to move, thereby achieving deviation correction of the PE film.

[0005] In the above-mentioned patent, the PE film needs to move along with the traction roller during the correction process in order to achieve the correction of the PE film. However, when the telescopic cylinder drives the laterally movable platform to move, the traction roller can undoubtedly move along with the platform, but the PE film may not necessarily move along with the traction roller. Since the PE film has certain toughness and plasticity, when the tension of the PE film is insufficient, it will cause relative displacement between the PE film and the traction roller when the platform moves, that is, the traction roller moves with the platform, but the PE film does not move or the displacement is different from the displacement of the traction roller. Summary of the Invention

[0006] The object of the present invention is to provide a deviation-correcting device and method for PE film, so as to solve the problem that the existing deviation-correcting device causes the PE film to not move synchronously with the traction roller.

[0007] The present invention is achieved through the following technical solutions:

[0008] A deviation correction device for PE film, comprising a retractable roller and a traction roller, a deviation correction roller arranged between the retractable roller and the traction roller, a deviation correction mechanism, a deviation correction sensor and a controller;

[0009] The lower end of the correcting roller contacts the PE film to tension the PE film;

[0010] The correction sensor is arranged at the front end or the rear end of the correction roller to detect whether the PE film is deflected;

[0011] The correction mechanism includes a horizontal telescopic component and a vertical telescopic component. The horizontal telescopic component is used to drive the correction roller to move horizontally to correct the PE film, and the vertical telescopic component is used to drive the correction roller to move downward, so that the PE film has a greater tension at the correction roller during the correction process.

[0012] The correction sensor, the horizontal telescopic component and the vertical telescopic component are all electrically connected to the controller. The controller determines whether to turn on the horizontal telescopic component and the vertical telescopic component based on the detection signal received from the correction sensor.

[0013] The working of the deviation correction device of the present invention is as follows:

[0014] Driven by the traction roller, the PE film passes through the correction roller and the take-up roller in sequence, and is finally wound on the take-up roller.

[0015] The present invention adds a correction roller on the basis of the existing PE film winding system, which is used to correct the PE film when it is laterally offset. The lateral offset of the present invention specifically refers to the offset perpendicular to the transmission direction of the PE film. The lateral offset can also be understood as horizontal offset and axial offset of the correction roller.

[0016] The "larger tension" mentioned in the present invention means that the tension of the PE film at the correction roller during the correction process is greater than that during the normal transmission.

[0017] The correcting roller of the present invention achieves lateral displacement through a lateral telescopic assembly. The vertical telescopic assembly and the lateral telescopic assembly are both electrically connected to a controller. When the PE film deviates, the controller controls the vertical telescopic assembly and the lateral telescopic assembly to extend and retract at the same time. The vertical telescopic assembly retracts downward to increase the tension between the PE film and the correcting roller, ensuring that when the lateral telescopic structure drives the correcting roller to move laterally, the PE film is displaced along with the correcting roller. In this way, the problem that the PE film does not displace synchronously with the traction roller due to the existing correcting device is solved.

[0018] Furthermore, the deviation-correcting roller includes a fixed shaft, a deviation-correcting housing and a bearing;

[0019] The fixed shaft is coaxially arranged in the correction housing, and both ends of the fixed shaft protrude from the axial ends of the correction housing. The fixed shaft and the correction housing are connected by bearings. Under the action of the bearings, the fixed shaft and the correction housing realize relative displacement, that is, when the fixed shaft is different, the correction housing rotates.

[0020] Furthermore, the deviation-correcting mechanism includes a first vertical telescopic assembly, a second vertical telescopic assembly, a first horizontal telescopic assembly, a second horizontal telescopic assembly, a vertical elastic support, and a fixing seat;

[0021] The first horizontal telescopic assembly and the second horizontal telescopic assembly are arranged horizontally and are used to drive the lateral displacement of the deviation-correcting roller. The telescopic ends of the first horizontal telescopic assembly and the second horizontal telescopic assembly are respectively connected to the two ends of the fixed shaft, and the first horizontal telescopic assembly and the second horizontal telescopic assembly are respectively supported by a vertical elastic support.

[0022] The first vertical telescopic assembly and the second vertical telescopic assembly are arranged vertically and are used to drive the vertical displacement of the correction roller. The telescopic ends of the first vertical telescopic assembly and the second vertical telescopic assembly are respectively connected to the two ends of the fixed shaft; the bottoms of the first vertical telescopic assembly and the second vertical telescopic assembly are slidably arranged on the fixed seat.

[0023] The first vertical telescopic assembly and the second vertical telescopic assembly of the present invention not only support the correcting roller, but are also used to retract downward to increase the tension of the PE film at the correcting roller, so that the PE film has a larger tension at the correcting roller. Moreover, since the bottom of the first vertical telescopic assembly and the second vertical telescopic assembly are slidably arranged on the fixed seat, when the fixed shaft moves under the drive of the first horizontal telescopic assembly and the second horizontal telescopic assembly, the first vertical telescopic assembly and the second vertical telescopic assembly can also move on the fixed seat without affecting the movement of the correcting roller.

[0024] The first horizontal telescopic assembly and the second horizontal telescopic assembly of the present invention are respectively supported by a vertical elastic support. Since the vertical elastic support has a certain elasticity, when the first vertical telescopic assembly and the second vertical telescopic assembly retract downward, since the vertical elastic support has a certain elasticity, the first horizontal telescopic assembly and the second horizontal telescopic assembly can retract and move downward with the first vertical telescopic assembly and the second vertical telescopic assembly.

[0025] Since the horizontal deviation of the PE film will not be too large in actual working engineering and will be corrected, the expansion and contraction of the first vertical telescopic assembly, the second vertical telescopic assembly, the first horizontal telescopic assembly, and the second horizontal telescopic assembly will not be too large.

[0026] Furthermore, the telescopic ends of the first vertical telescopic assembly and the second vertical telescopic assembly are provided with support blocks, the upper end surface of the support block is a downwardly concave arc groove, and the fixed shaft is embedded in the arc groove. By providing a support block with an arc groove, the connection stability of the first vertical telescopic assembly, the second vertical telescopic assembly and the fixed shaft can be improved.

[0027] Furthermore, the vertical elastic support is a column, and the column has an elastic section, and the vertical displacement of the first horizontal telescopic assembly and the second horizontal telescopic assembly is achieved through the elastic action of the elastic section.

[0028] Furthermore, the column includes an upper supporting section and a lower supporting section, the upper supporting section and the lower supporting section are connected by an elastic section, the bottom of the lower supporting section is fixed on a fixing seat, and the elastic section can be a spring.

[0029] Furthermore, a slide groove is provided on the upper end surface of the fixing seat, and a slider is provided at the bottom of each of the first vertical telescopic assembly and the second vertical telescopic assembly, and the slider is slidably arranged in the slide groove.

[0030] Specifically, the slider can slide within the chute using any existing technology. Ball bearings can be used to move within the chute: balls are provided at the bottom and two symmetrical sides of the slider, and grooves are provided on both sides of the chute to cooperate with the balls, and the balls can move within the grooves. Alternatively, a slide rod can be provided within the chute, and a through groove is provided on the slider to cooperate with the slide rod. The slide rod is inserted into the through groove, and the slider can slide on the slide rod.

[0031] Preferably, a limiting mechanism is provided at both ends of the slide groove, and the limiting mechanism is used to limit the lateral displacement of the first vertical telescopic assembly and the second vertical telescopic assembly. The limiting mechanism may be an elastic blocking block.

[0032] Furthermore, the first vertical telescopic assembly, the second vertical telescopic assembly, the first horizontal telescopic assembly and the second horizontal telescopic assembly are all hydraulic cylinders.

[0033] Furthermore, the correction shell has an annular cavity, which is connected to the vacuum mechanism through a vacuum tube. A plurality of through holes are provided on the outer wall of the annular cavity. The aperture of the through holes is small (measured in millimeters) and will not affect the transmission of the PE film.

[0034] The correcting roller of the present invention is provided with an interlayer (annular cavity), which is connected to a vacuum pumping mechanism, and a plurality of through holes are provided on the surface of the correcting roller. When the lateral telescopic assembly drives the correcting roller to move laterally, the vacuum pumping mechanism is started at the same time, and the vacuum adsorption effect is utilized to ensure that the PE film moves together with the correcting roller. As long as the vacuum degree is appropriate, the transmission of the PE film will not be affected.

[0035] Since the horizontal deviation of the PE film will not be too large in actual working engineering, it will be corrected. Therefore, the vacuum adsorption time is also short. When the correction process is completed, the vacuum mechanism can be turned off immediately. The vacuum mechanism used is the existing technology.

[0036] The correction method based on the correction device includes the following steps:

[0037] S1, the correction sensor collects the horizontal position of the PE film in real time and transmits the collected signal to the controller;

[0038] S2. When the correction sensor detects that the PE film is deflected in the horizontal direction, the controller controls and drives the first vertical telescopic assembly, the second vertical telescopic assembly, the first horizontal telescopic assembly, and the second horizontal telescopic assembly to operate simultaneously, wherein the telescopic directions of the first horizontal telescopic assembly and the second horizontal telescopic assembly are opposite to the deflection direction of the PE film; the first vertical telescopic assembly and the second vertical telescopic assembly retract downward to increase the tension of the PE film at the correction roller, so that the PE film has a greater tension at the correction roller;

[0039] S3. When the deviation correction sensor detects that the PE film has returned to the correct position, the controller controls and drives the first vertical telescopic assembly and the second vertical telescopic assembly to extend upward and return to their original positions.

[0040] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0041] 1. The correction mechanism of the present invention includes a horizontal telescopic assembly and a vertical telescopic assembly. The horizontal telescopic assembly corrects the PE film. During the correction process, the vertical telescopic assembly is simultaneously driven to move the correction roller downward, thereby increasing the tension between the PE film and the correction roller. This ensures that when the horizontal telescopic structure drives the correction roller to move horizontally, the PE film moves along with the correction roller.

[0042] 2. The correcting roller of the present invention is provided with an interlayer (annular cavity), which is connected to the vacuum pumping mechanism, and a plurality of through holes are provided on the surface of the correcting roller. When the lateral telescopic assembly drives the correcting roller to move laterally, the vacuum pumping mechanism is started at the same time, and the vacuum adsorption effect is utilized to ensure that the PE film moves together with the correcting roller, further ensuring that the PE film moves together with the correcting roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0044] Figure 1 The structure of the correction device of the present invention is shown as follows Figure 1 ;

[0045] Figure 2 The structure of the correction device of the present invention is shown as follows Figure 2 ;

[0046] Figure 3 It is an axial cross-sectional view of the correction roller;

[0047] Figure 4This is a schematic diagram of the sliding connection between the first vertical telescopic component and the fixed base.

[0048] Markings and corresponding parts names in the accompanying drawings:

[0049] 1-retracting roller; 2-correcting roller; 3-traction roller; 4-first vertical telescopic assembly; 5-fixed seat; 6-support block; 7-first horizontal telescopic assembly; 8-vertical elastic support; 9-second horizontal telescopic assembly; 10-second vertical telescopic assembly; 11-vacuum tube; 12-slider; 21-fixed shaft; 22-correcting housing; 23-bearing; 51-slide; 100-PE film. DETAILED DESCRIPTION

[0050] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0051] Example 1

[0052] like Figures 1-4 As shown, a correction device for PE film includes a rewinding roller 1 and a traction roller 3, and also includes a correction roller 2 arranged between the rewinding roller 1 and the traction roller 3, as well as a correction mechanism, a correction sensor and a controller. Among them, the traction roller 3 is used to drive the PE film 100 to be transmitted, the rewinding roller 1 is used to realize the winding of the PE film 100, and the correction roller 2 is used to realize the correction of the PE film 100.

[0053] The lower end of the deflection correction roller 2 contacts the PE film 100 to tighten the PE film 100, that is, the path of the PE film 100 between the reeling roller 1, the deflection correction roller 2 and the traction roller 3 is as follows: the PE film 100 contacts the upper part of the traction roller 3 and then moves downward to contact the lower end of the deflection correction roller 2, and then moves upward to contact the upper end of the reeling roller 1 and is wound up under the rotation of the reeling roller 1. In this embodiment, the up and down times are relative to the attached Figure 1 Generally speaking, the one farther from the ground is up, and the one closer to the ground is down.

[0054] The correction roller 2 includes a fixed shaft 21, a correction housing 22 and a bearing 23;

[0055] The fixed shaft 21 is coaxially arranged in the correction housing 22, and both ends of the fixed shaft 21 protrude from the axial ends of the correction housing 22. The fixed shaft 21 and the correction housing 22 are connected by bearings 23, and the relative displacement between the fixed shaft 21 and the correction housing 22 is achieved through the bearings.

[0056] The correction sensor (not shown) is arranged at the front end or rear end of the correction roller 2, that is, the correction sensor can be arranged at a certain position between the correction roller 2 and the retracting roller 1, that is, the rear end, or it can be arranged at a certain position between the correction roller 2 and the traction roller 3, that is, the front end, the front end of the correction roller 2, and the correction sensor can be an infrared sensor. Preferably, correction sensors are arranged at both ends of the PE film 100 in the horizontal direction, marked as sensor No. 1 and sensor No. 2 respectively. When the PE film 100 deviates toward sensor No. 1, there is no PE film 100 in the path of the infrared emission line of sensor No. 2, and sensor No. 2 detects that the PE film 100 has deviated. Similarly, when the PE film 100 deviates toward sensor No. 2, sensor No. 1 detects that the PE film 100 has deviated. The correction sensor transmits the detection signal to the controller in real time.

[0057] The correction mechanism includes a horizontal telescopic component and a vertical telescopic component. The horizontal telescopic component is used to drive the correction roller 2 to move horizontally to correct the PE film 100, and the vertical telescopic component is used to drive the correction roller 2 to move downward, so that the PE film 100 has a large tension at the correction roller 2 during the correction process.

[0058] Specifically: the correction mechanism includes a first vertical telescopic component 4, a second vertical telescopic component 10, a first horizontal telescopic component 7, a second horizontal telescopic component 9, a vertical elastic support 8 and a fixed seat 5, wherein the first vertical telescopic component 4 and the second vertical telescopic component 10 together constitute a vertical telescopic component, and the first horizontal telescopic component 7 and the second horizontal telescopic component 9 together constitute a horizontal telescopic component.

[0059] In this embodiment, the first vertical telescopic assembly 4, the second vertical telescopic assembly 10, the first horizontal telescopic assembly 7, and the second horizontal telescopic assembly 9 are all hydraulic cylinders, although other telescopic assemblies, such as pneumatic cylinders, may also be used. The first vertical telescopic assembly 4, the second vertical telescopic assembly 10, the first horizontal telescopic assembly 7, and the second horizontal telescopic assembly 9 each include a housing and a telescopic end. The housing is used to secure the first vertical telescopic assembly 4, the second vertical telescopic assembly 10, the first horizontal telescopic assembly 7, and the second horizontal telescopic assembly 9, while the telescopic end is used to achieve telescoping.

[0060] The first horizontal telescopic assembly 7 and the second horizontal telescopic assembly 9 are horizontally arranged to drive the lateral displacement of the deviation-correcting roller 2. The telescopic ends of the first horizontal telescopic assembly 7 and the second horizontal telescopic assembly 9 are respectively connected to the two ends of the fixed shaft 21, and the first horizontal telescopic assembly 7 and the second horizontal telescopic assembly 9 are respectively supported by a vertical elastic support 8; exemplarily: the vertical elastic support 8 is a column, and the column has an elastic section, specifically: the column includes an upper supporting section and a lower supporting section, the upper supporting section and the lower supporting section are connected by an elastic section, and the bottom of the lower supporting section is fixed on the fixed seat 5; wherein the elastic section can be a spring.

[0061] The first vertical telescopic component 4 and the second vertical telescopic component 10 are vertically arranged to drive the vertical displacement of the correcting roller 2. The telescopic ends of the first vertical telescopic component 4 and the second vertical telescopic component 10 are respectively connected to the two ends of the fixed shaft 21; the bottoms of the first vertical telescopic component 4 and the second vertical telescopic component 10 are slidably arranged on the fixed seat 5. Specifically, the upper end surface of the fixed seat 5 is provided with a slide groove 51, and the bottoms of the first vertical telescopic component 4 and the second vertical telescopic component 10 are both provided with a slider 12, and the slider 12 is slidably arranged in the slide groove 51. The sliding method of the slider 12 in the slide groove 51 can adopt any existing technology, and a ball can be used to move in the slide groove 51, such as Figure 4 As shown, balls are provided at the bottom and two symmetrical sides of the slider 12. Slots (not shown) are provided on both sides of the slide 51 to engage with the balls, and the balls are able to move within the slots. Alternatively, a slide rod can be provided within the slide 51, and a through slot can be provided on the slider 12 to engage with the slide rod. The slide rod is inserted into the through slot, and the slider can slide on the slide rod.

[0062] Preferably, the telescopic ends of the first vertical telescopic assembly 4 and the second vertical telescopic assembly 10 are provided with support blocks 6 , the upper end surface of the support block 6 is a downwardly concave arc groove, and the fixed shaft 21 is embedded in the arc groove.

[0063] The correction sensor, the horizontal telescopic assembly and the vertical telescopic assembly are all electrically connected to the controller. The controller determines whether to start the horizontal telescopic assembly and the vertical telescopic assembly based on the detection signal received from the correction sensor.

[0064] The correction method of this embodiment includes the following steps:

[0065] S1. The deviation correction sensor collects the horizontal position of the PE film 100 in real time and transmits the collected signal to the controller.

[0066] S2. When the correction sensor detects that the PE film 100 is deflected in the horizontal direction, the controller controls and drives the first vertical telescopic assembly 4, the second vertical telescopic assembly 10, the first horizontal telescopic assembly 7, and the second horizontal telescopic assembly 9 to work simultaneously, wherein the expansion and contraction directions of the first horizontal telescopic assembly 7 and the second horizontal telescopic assembly 9 are opposite to the deflection direction of the PE film 100; the first vertical telescopic assembly 4 and the second vertical telescopic assembly 10 retract downward to increase the tension of the PE film 100 at the correction roller 2, so that the PE film 100 has a greater tension at the correction roller 2;

[0067] Specifically: when the PE film 100 deviates toward the side close to the first horizontal telescopic component 7, the correction sensor close to the second horizontal telescopic component 9 detects that the PE film 100 has deviated, and the controller drives the first horizontal telescopic component 7 to extend according to the received deviation signal, while the second horizontal telescopic component 9 retracts, so that the correction roller 2 moves close to the second horizontal telescopic component 9 until the PE film 100 returns to the right position and the correction is completed; during the correction process, the first vertical telescopic component 4 and the second vertical telescopic component 10 move with the correction roller 2; during the correction process, when the first While the horizontal telescopic assembly 7 and the second horizontal telescopic assembly 9 are being operated, the first vertical telescopic assembly 4 and the second vertical telescopic assembly 10 are being started and retracted downward, so that the PE film 100 has a greater tension at the deviation correction roller 2. When the first vertical telescopic assembly 4 and the second vertical telescopic assembly 10 are being retracted downward, the first horizontal telescopic assembly 7 and the second horizontal telescopic assembly 9 squeeze the vertical elastic support 8 downward. Since the vertical elastic support 8 is elastic, the first horizontal telescopic assembly 7 and the second horizontal telescopic assembly 9 move downward along with the first vertical telescopic assembly 4 and the second vertical telescopic assembly 10.

[0068] S3. When the deviation correction sensor detects that the PE film 100 has returned to the straight position, the controller controls and drives the first vertical telescopic assembly 4 and the second vertical telescopic assembly 10 to extend upward and return to their original positions, so that the tension of the PE film 100 returns to its initial state, that is, the normal transmission state.

[0069] Example 2

[0070] like Figures 1-4 As shown, this embodiment is based on embodiment 1, and the correction housing 22 has an annular cavity, which is connected to the vacuum mechanism through a vacuum tube 11, and a plurality of through holes are provided on the outer wall of the annular cavity.

[0071] In this embodiment, when the lateral telescopic component drives the correcting roller 2 to move laterally, the vacuum mechanism is started at the same time, and the vacuum adsorption effect is used to ensure that the PE film 100 is displaced together with the correcting roller 2. As long as the vacuum degree is appropriate, it will not affect the transmission of the PE film 100. The vacuum adsorption effect is used to ensure that the PE film 100 is displaced together with the correcting roller 2, further ensuring that the PE film 100 is displaced together with the correcting roller 2.

[0072] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0073] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not used to limit the conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

Claims

1. A deviation correction device for PE film, comprising a take-up roller (1) and a traction roller (3), characterized in that: It also includes a deviation correction roller (2) arranged between the retracting roller (1) and the traction roller (3), as well as a deviation correction mechanism, a deviation correction sensor and a controller; The lower end of the deviation-correcting roller (2) contacts the PE film (100) to tension the PE film (100); The deviation correction sensor is arranged at the front end or the rear end of the deviation correction roller (2) and is used to detect whether the PE film (100) is deflected; The deflection correction mechanism comprises a horizontal telescopic component and a vertical telescopic component, wherein the horizontal telescopic component is used to drive the deflection correction roller (2) to move laterally to correct the deflection of the PE film (100), and the vertical telescopic component is used to drive the deflection correction roller (2) to move downward, so that the PE film (100) has a large tension at the deflection correction roller (2) during the deflection correction process; The correction sensor, the horizontal telescopic component and the vertical telescopic component are all electrically connected to the controller. The controller determines whether to turn on the horizontal telescopic component and the vertical telescopic component based on the detection signal received from the correction sensor.

2. A deviation-correcting device for PE film according to claim 1, characterized in that: The deviation-correcting roller (2) comprises a fixed shaft (21), a deviation-correcting housing (22) and a bearing (23); The fixed shaft (21) is coaxially arranged in the deviation-correcting housing (22), and both ends of the fixed shaft (21) protrude from the axial ends of the deviation-correcting housing (22). The fixed shaft (21) and the deviation-correcting housing (22) are connected via a bearing (23).

3. The deviation-correcting device for PE film according to claim 2, characterized in that: The deviation-correcting mechanism comprises a first vertical telescopic assembly (4), a second vertical telescopic assembly (10), a first horizontal telescopic assembly (7), a second horizontal telescopic assembly (9), a vertical elastic support (8) and a fixing seat (5); The first horizontal telescopic assembly (7) and the second horizontal telescopic assembly (9) are arranged horizontally and are used to drive the deviation correction roller (2) to move laterally. The telescopic ends of the first horizontal telescopic assembly (7) and the second horizontal telescopic assembly (9) are respectively connected to the two ends of the fixed shaft (21), and the first horizontal telescopic assembly (7) and the second horizontal telescopic assembly (9) are respectively supported by a vertical elastic support (8). The first vertical telescopic assembly (4) and the second vertical telescopic assembly (10) are arranged vertically and are used to drive the vertical displacement of the deviation-correcting roller (2); the telescopic ends of the first vertical telescopic assembly (4) and the second vertical telescopic assembly (10) are respectively connected to the two ends of the fixed shaft (21); and the bottoms of the first vertical telescopic assembly (4) and the second vertical telescopic assembly (10) are slidably arranged on the fixed seat (5).

4. The deviation-correcting device for PE film according to claim 3, characterized in that: The telescopic ends of the first vertical telescopic assembly (4) and the second vertical telescopic assembly (10) are provided with support blocks (6), the upper end surface of the support block (6) is a downwardly concave arc groove, and the fixed shaft (21) is embedded in the arc groove.

5. The deviation-correcting device for PE film according to claim 3, characterized in that: The vertical elastic support (8) is a column, and the column has an elastic section.

6. The deviation-correcting device for PE film according to claim 5, characterized in that: The column comprises an upper supporting section and a lower supporting section, the upper supporting section and the lower supporting section are connected via an elastic section, and the bottom of the lower supporting section is fixed on a fixing seat (5).

7. The deviation-correcting device for PE film according to claim 3, characterized in that: The upper end surface of the fixing seat (5) is provided with a slide groove (51), and the bottoms of the first vertical telescopic assembly (4) and the second vertical telescopic assembly (10) are both provided with a slider (12), and the slider (12) is slidably arranged in the slide groove (51).

8. A deviation-correcting device for PE film according to any one of claims 3 to 7, characterized in that: The first vertical telescopic assembly (4), the second vertical telescopic assembly (10), the first horizontal telescopic assembly (7) and the second horizontal telescopic assembly (9) are all hydraulic cylinders.

9. The deviation-correcting device for PE film according to claim 2, characterized in that: The deviation-correcting housing (22) has an annular cavity, which is connected to a vacuum pumping mechanism via a vacuum tube (11), and a plurality of through holes are provided on the outer side wall of the annular cavity.

10. A deviation correction method based on the deviation correction device according to any one of claims 3 to 9, characterized in that: The following steps are involved: S1, the deviation correction sensor collects the horizontal position of the PE film (100) in real time and transmits the collected signal to the controller; S2. When the deviation correction sensor detects that the PE film (100) is deflected in the horizontal direction, the controller controls and drives the first vertical telescopic component (4), the second vertical telescopic component (10), the first horizontal telescopic component (7) and the second horizontal telescopic component (9) to work simultaneously, wherein the telescopic direction of the first horizontal telescopic component (7) and the second horizontal telescopic component (9) is opposite to the deflection direction of the PE film (100); the first vertical telescopic component (4) and the second vertical telescopic component (10) retract downward to increase the tension of the PE film (100) at the deviation correction roller (2), so that the PE film (100) has a greater tension at the deviation correction roller (2); S3. When the deviation correction sensor detects that the PE film (100) has returned to the correct position, the controller controls and drives the first vertical telescopic component (4) and the second vertical telescopic component (10) to extend upward and return to their original positions.

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