Automatic tray bottom film fixing device

Abstract

The utility model provides an automatic tray bottom film fixing device which comprises a conveying assembly, a film covering assembly, a fixing assembly, a tray and a film roll, the film covering assembly is arranged in the middle of the upper portion of the conveying assembly, the fixing assembly is arranged above the conveying assembly and located on one side of the film covering assembly, and the tray is arranged on the conveying assembly and located on the other side of the film covering assembly. The tray can penetrate through the space between the film covering assembly and the conveying assembly, and the film roll is arranged on the film covering assembly. According to the automatic film laminating and cutting device, automatic film laminating and cutting can be carried out on the tray, the hot air gun is used for drying and shrinking the PE film laid on the tray, the fixing effect is achieved, and the PE film is prevented from being folded or dislocated due to wind blowing or scratching in the disc stacking process.

Description

Technical Field

[0001] The utility model belongs to the technical field of film coating equipment, in particular to an automatic fixing device for a bottom film of a tray. Background Art

[0002] When the finished welding wire is stacked, the products on the pallet are wrapped to form a whole to prevent deformation, looseness, and collapse caused by movement during factory turnover or logistics transportation; and to play a role in dustproof, moisture-proof, waterproof, and theft-proof. During the automatic packaging process, the bottom film on the wooden pallet is easily folded or misplaced due to wind or scratches during the stacking process, resulting in the packaging process not being able to carry out multi-angle and all-round packaging without dead ends, and not effectively playing its due role, resulting in rework, time waste, and low production efficiency. Therefore, providing an effective fixing device and method for the bottom film of the pallet is a problem that technicians in this field urgently need to solve. Utility Model Content

[0003] In view of this, the utility model aims to provide an automatic fixing device for the bottom film of a pallet, so as to solve the problem that the bottom film is easily folded or misplaced due to wind blowing or scratches during the encoding process.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] An automatic fixing device for a bottom film of a tray, comprising a conveying assembly, a film covering assembly, a fixing assembly, a tray, and a film roll, wherein the film covering assembly is arranged in the middle above the conveying assembly, the fixing assembly is arranged above the conveying assembly and located on one side of the film covering assembly, and the tray is arranged on the conveying assembly;

[0006] The coating assembly includes a rectangular frame, a cutting assembly, a film brushing roller, a driving shaft, a film placing roller, a second motor, and a third motor. The film brushing roller, the driving shaft, and the film placing roller are rotatably arranged on the side wall of the rectangular frame in sequence. The cutting assembly is installed in the rectangular frame, and the cutting assembly is arranged on the side of the film brushing roller away from the film placing roller. The mounting ends of the second motor and the third motor are both connected to the rectangular frame, the output shaft of the second motor is connected to the cutting assembly, and the output shaft of the third motor is connected to the driving shaft.

[0007] Furthermore, the tray can pass between the film coating assembly and the conveying assembly, and the film roll is arranged on the film coating assembly; the driving shaft and the film placing roller are arranged horizontally, and the film brush roller is arranged on the upper side of the driving shaft, and the driving shaft is connected to one end of the film placing roller through the second conveyor belt, and the driving shaft and the film brush roller are provided with meshing gears at one end away from the second conveyor belt, and the driving shaft drives the film brush roller to rotate through the meshing gear. The third motor is started to drive the driving shaft to rotate, and the film placing roller is rotated synchronously through the second conveyor belt, and the film brush roller rotates in the opposite direction to the driving shaft through the meshing gear.

[0008] Furthermore, the two ends of the film-laying roller are provided with limit plates, and the film roll is arranged above the driving shaft and the film-laying roller, and is located between the two limit plates. The film roll is placed on the driving shaft and the film-laying roller, and the end of the PE film passes through between the driving shaft and the film-brushing roller. As the driving shaft and the film-laying roller rotate toward the film-brushing roller, the film-brushing roller rotates toward the driving shaft, and the film roll rotates on the driving shaft and the film-laying roller toward the film-brushing roller. The end of the PE film extends downward from between the driving shaft and the film-brushing roller and is spread on the conveying tray. The limit plates play a role in limiting the film roll.

[0009] Furthermore, the film brush roller is provided with a plurality of evenly distributed rubber bristles, and the plurality of rubber bristles correspond to the positions of the driving shaft. Through the rotation of the driving shaft, the PE film passes between the driving shaft and the film brush roller, and the rubber bristles play a covering role, so that the PE film is more closely covered on the pallet.

[0010] Furthermore, the cutting assembly includes a ball screw, a cutting knife, a first sensor probe, a second sensor probe, a first sensor detection block, and a second sensor detection block. The ball screw is rotatably arranged on the inner wall of a rectangular frame, the output shaft of the second motor is connected to the screw, the cutting knife is arranged on one side of the nut of the ball screw, and the cutting knife is located below the brush film roller and the driving shaft, the side of the nut away from the second motor is provided with a first sensor probe, the rectangular frame is provided with a first sensor detection block corresponding to the first sensor probe, the side of the nut close to the second motor is provided with a second sensor probe, and the rectangular frame is provided with a second sensor detection block corresponding to the second sensor probe. The second motor is started, driving the screw to rotate, so that the nut moves toward the direction of the first sensor detection block, when the first sensor probe contacts the first sensor detection block, the cutting is completed, and at the same time, the controller controls the output shaft of the second motor to rotate in the opposite direction, so that the cutting knife returns to its original position.

[0011] Further, the conveying assembly includes a first conveyor belt, two mounting plates, and a first motor, wherein the two mounting plates are arranged on both sides of the first conveyor belt, the mounting end of the first motor is arranged on the mounting plates, and the output shaft of the first motor is connected to the rotating shaft of the first conveyor belt;

[0012] The rectangular frame is set on the mounting plate.

[0013] Furthermore, the fixing assembly includes a first angle adjustment frame, a second angle adjustment frame, a third angle adjustment frame, a fourth angle adjustment frame, and four hot air guns. The first angle adjustment frame, the second angle adjustment frame, the third angle adjustment frame, and the fourth angle adjustment frame are arranged on the mounting plate and around the pallet. The ends of the first angle adjustment frame, the second angle adjustment frame, the third angle adjustment frame, and the fourth angle adjustment frame are all provided with hot air guns. Through the four angle adjustment frames, the four hot air guns are aimed at the four corners of the pallet, and the PE film covered on the pallet is heated and output with hot air to shrink, thereby achieving the function of fixing the bottom film.

[0014] Furthermore, a first photoelectric sensor, a second photoelectric sensor, and a third photoelectric sensor are provided on one side of the mounting plate; the first photoelectric sensor and the second photoelectric sensor are arranged on the side of the mounting plate where a fixed component is provided; the first photoelectric sensor is arranged on the side of the first angle adjustment frame away from the second angle adjustment frame; the second photoelectric sensor is arranged between the second angle adjustment frame and the rectangular frame; the third photoelectric sensor is arranged below the driving shaft.

[0015] Furthermore, a first photoelectric sensor block corresponding to the first photoelectric sensor and the third photoelectric sensor is disposed at one end of the tray, and a second photoelectric sensor block corresponding to the second photoelectric sensor is disposed at the other end of the tray.

[0016] Furthermore, the first photoelectric sensor, the second photoelectric sensor, the third photoelectric sensor, the first photoelectric sensing block, the second photoelectric sensing block, the first sensor probe, the second sensor probe, the first sensor detection block, the second sensor detection block, the first motor, the second motor, and the third motor are all electrically connected to the controller.

[0017] Compared with the prior art, the automatic fixing device for the bottom film of a pallet described in the utility model has the following advantages:

[0018] (1) The hot air gun described in the utility model can adjust the angle through the angle adjustment frame to adapt to pallets of different sizes. The hot air gun is aimed at the four corners of the pallet to shrink the PE film laid on the pallet, which plays a fixing role and prevents the PE film from being folded or misplaced due to wind blowing or scratching during the palleting process;

[0019] (2) The conveying assembly described in the utility model is provided with a photoelectric sensor, which corresponds to the photoelectric sensor block on the pallet and is connected to the motor through a controller. After the pallet reaches the set position, it can start the cutting assembly, the driving shaft and the conveyor belt, thereby completing the laying, cutting and fixing of the base film. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0021] Figure 1 This is an overall schematic diagram of an automatic fixing device for a bottom film of a pallet according to an embodiment of the utility model;

[0022] Figure 2 It is a top view schematic diagram of an automatic fixing device for a bottom film of a tray according to an embodiment of the utility model;

[0023] Figure 3This is a schematic diagram of placing a film roll in an automatic fixing device for a pallet bottom film according to an embodiment of the utility model.

[0024] Description of reference numerals:

[0025] 1. Tray; 2. Mounting plate; 3. First conveyor belt; 4. First motor; 5. Rectangular frame; 6. Film brush roller; 7. Driving shaft; 8. Film placing roller; 9. Second motor; 10. Third motor; 11. Second conveyor belt; 12. Meshing gear; 13. Limiting plate; 14. Rubber bristles; 15. Screw rod; 16. Nut; 17. Film roll; 18. First sensor probe; 19. Second sensor probe; 20. First sensor detection block; 21. Second sensor detection block; 22. First angle adjustment frame; 23. Second angle adjustment frame; 24. Third angle adjustment frame; 25. Fourth angle adjustment frame; 26. Hot air gun; 27. First photoelectric sensor; 28. Second photoelectric sensor; 30. First photoelectric sensing block; 31. Second photoelectric sensing block. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0027] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0030] like Figures 1 to 3 As shown, an automatic fixing device for the bottom film of a pallet includes a conveying component, a film covering component, a fixing component, a pallet 1, and a film roll 17. The film covering component is arranged in the middle above the conveying component, the fixing component is arranged above the conveying component and located on one side of the film covering component, and the pallet 1 is arranged on the conveying component;

[0031] The coating assembly includes a rectangular frame 5, a cutting assembly, a film brush roller 6, a driving shaft 7, a film placing roller 8, a second motor 9, and a third motor 10. The film brush roller 6, the driving shaft 7, and the film placing roller 8 are rotatably arranged on the side wall of the rectangular frame 5 in sequence. The cutting assembly is installed in the rectangular frame 5, and the cutting assembly is arranged on the side of the film brush roller 6 away from the film placing roller 8. The mounting ends of the second motor 9 and the third motor 10 are both connected to the rectangular frame 5, the output shaft of the second motor 9 is connected to the cutting assembly, and the output shaft of the third motor 10 is connected to the driving shaft 7.

[0032] The tray 1 can pass between the film coating assembly and the conveying assembly, and the film roll 17 is arranged on the film coating assembly; the driving shaft 7 and the film placing roller 8 are arranged horizontally, and the film brush roller 6 is arranged on the upper side of the driving shaft 7. The driving shaft 7 is connected to one end of the film placing roller 8 through the second conveyor belt 11. The driving shaft 7 and the end of the film brush roller 6 away from the second conveyor belt 11 are both provided with a meshing gear 12, and the driving shaft 7 drives the film brush roller 6 to rotate through the meshing gear 12. The third motor 10 is started, driving the driving shaft 7 to rotate, and the film placing roller 8 is rotated synchronously through the second conveyor belt 11, and the film brush roller 6 rotates in the opposite direction to the driving shaft 7 through the meshing gear 12.

[0033] Limiting plates 13 are provided at both ends of the film-laying roller 8, and the film roll 17 is arranged above the driving shaft 7 and the film-laying roller 8, and is located between the two limiting plates 13. The film roll 17 is placed on the driving shaft 7 and the film-laying roller 8, and the end of the PE film passes between the driving shaft 7 and the film-brushing roller 6. As the driving shaft 7 and the film-laying roller 8 rotate toward the film-brushing roller 6, and the film-brushing roller 6 rotates toward the driving shaft 7, the film roll 17 rotates toward the film-brushing roller 6 on the driving shaft 7 and the film-laying roller 8, and the end of the PE film extends downward from between the driving shaft 7 and the film-brushing roller 6, and is laid on the conveying tray 1. The limiting plates 13 play a role in limiting the film roll 17.

[0034] The film brush roller 6 is provided with a plurality of evenly distributed rubber bristles 14, and the plurality of rubber bristles 14 correspond to the positions of the driving shaft 7. Through the rotation of the driving shaft 7, the PE film passes between the driving shaft 7 and the film brush roller 6, and the rubber bristles 14 play a covering role, so that the PE film is more closely covered on the pallet 1.

[0035] The cutting assembly includes a ball screw, a cutting knife, a first sensor probe 18, a second sensor probe 19, a first sensor detection block 20, and a second sensor detection block 21. The screw rod 15 of the ball screw is rotatably arranged on the inner wall of the rectangular frame 5. The output shaft of the second motor 9 is connected to the screw rod 15. The cutting knife is arranged on one side of the nut 16 of the ball screw, and the cutting knife is located below the brush film roller 6 and the driving shaft 7. The first sensor probe 18 is arranged on the side of the nut 16 away from the second motor 9. The rectangular frame 5 is provided with a first sensor detection block 20 corresponding to the first sensor probe 18. The side of the nut 16 close to the second motor 9 is provided with a second sensor probe 19. The rectangular frame 5 is provided with a second sensor detection block 21 corresponding to the second sensor probe 19. The second motor 9 is started, driving the screw rod 15 to rotate, so that the nut 16 moves in the direction of the first sensor detection block 20. When the first sensor probe 18 contacts the first sensor detection block 20, the cutting is completed. At the same time, the controller controls the output shaft of the second motor 9 to rotate in the opposite direction, so that the cutting knife returns to its original position. The model of the ball screw is CNF1530-6.

[0036] The conveying assembly includes a first conveyor belt 3, two mounting plates 2, and a first motor 4. The two mounting plates 2 are arranged on both sides of the first conveyor belt 3. The mounting end of the first motor 4 is arranged on the mounting plates 2. The output shaft of the first motor 4 is connected to the rotating shaft of the first conveyor belt 3.

[0037] The rectangular frame 5 is arranged on the mounting plate 2 .

[0038] The fixing assembly includes a first angle adjustment frame 22, a second angle adjustment frame 23, a third angle adjustment frame 24, a fourth angle adjustment frame 25, and four hot air guns 26. The first angle adjustment frame 22, the second angle adjustment frame 23, the third angle adjustment frame 24, and the fourth angle adjustment frame 25 are arranged on the mounting plate 2 and arranged around the pallet 1. The ends of the first angle adjustment frame 22, the second angle adjustment frame 23, the third angle adjustment frame 24, and the fourth angle adjustment frame 25 are all provided with hot air guns 26. Through the four angle adjustment frames, the four hot air guns 26 are aligned with the four corners of the pallet 1, and the PE film covered on the pallet 1 is heated and output with hot air to shrink, thereby achieving the function of fixing the bottom film.

[0039] A first photoelectric sensor 27, a second photoelectric sensor 28, and a third photoelectric sensor are provided on one side of the mounting plate 2. The first photoelectric sensor 27 and the second photoelectric sensor 28 are arranged on the side of the mounting plate 2 where a fixed component is provided. The first photoelectric sensor 27 is arranged on a side of the first angle adjustment frame 22 away from the second angle adjustment frame 23. The second photoelectric sensor 28 is arranged between the second angle adjustment frame 23 and the rectangular frame 5. The third photoelectric sensor is arranged below the driving shaft 7.

[0040] A first photoelectric sensor block 30 corresponding to the first photoelectric sensor 27 and the third photoelectric sensor is disposed at one end of the tray 1 , and a second photoelectric sensor block 31 corresponding to the second photoelectric sensor 28 is disposed at the other end of the tray 1 .

[0041] The first photoelectric sensor 27, the second photoelectric sensor 28, the third photoelectric sensor, the first photoelectric sensing block 30, the second photoelectric sensing block 31, the first sensor probe 18, the second sensor probe 19, the first sensor detection block 20, the second sensor detection block 21, the first motor 4, the second motor 9, and the third motor 10 are all electrically connected to the controller. The controller adopts a PLC controller.

[0042] In a specific implementation, the position of the hot air gun 26 is adjusted by the angle adjustment frame according to the size of the pallet 1, so that the four hot air guns 26 are aligned with the four corners of the pallet 1, and the pallet 1 is placed on the side of the first conveyor belt 3 away from the hot air gun 26, and the first motor 4 is started to convey the pallet 1 to the side of the hot air gun 26. When the third photoelectric sensor senses the first photoelectric sensing block 30, the third motor 10 is started, driving the driving shaft 7, the film brush roller 6 and the film placing roller 8 to rotate, so that the film roll 17 placed on the driving shaft 7 and the film placing roller 8 rotates, so that the end of the PE film extends downward from between the film brush roller 6 and the driving shaft 7. As the pallet 1 moves, the PE film is spread on the pallet 1; when the second photoelectric sensor 28 senses the second photoelectric sensing block 31, the first motor 4 and the third motor 10 are started to drive the driving shaft 7, the film brush roller 6 and the film placing roller 8 to rotate, thereby rotating the film roll 17 placed on the driving shaft 7 and the film placing roller 8, and extending the end of the PE film downward from between the film brush roller 6 and the driving shaft 7. As the pallet 1 moves, the PE film is spread on the pallet 1; when the second photoelectric sensor 28 senses the second photoelectric sensing block 31, the first motor 4 and the third motor 10 are started. When the machine 10 is turned off, the second motor 9 is started, and the nut 16 drives the cutting knife to slide in the direction of the first sensor detection block 20. When the first sensor probe 18 contacts the first sensor detection block 20, the cutting of the PE film is completed. At the same time, the controller controls the output shaft of the second motor 9 to rotate in the opposite direction. When the second sensor probe 19 contacts the second sensor detection block 21, the second motor 9 is turned off and the first motor 4 is started again, so that the tray 1 continues to be conveyed to one side of the hot air gun 26. When the first photoelectric sensor 27 senses the first photoelectric sensing block 30, the first motor 4 is turned off. At this time, the tray 1 is conveyed to the bottom of the hot air gun 26, and the hot air gun 26 is started to shrink the four corners of the PE film covered on the tray 1, so that the PE film is fixed on the tray 1.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic fixing device for a pallet bottom film, characterized in that: It comprises a conveying component, a film coating component, a fixing component, a tray (1), and a film roll (17), wherein the film coating component is arranged in the middle above the conveying component, the fixing component is arranged above the conveying component and located on one side of the film coating component, and the tray (1) is arranged on the conveying component; The film coating assembly comprises a rectangular frame (5), a cutting assembly, a film brush roller (6), a driving shaft (7), a film placing roller (8), a second motor (9), and a third motor (10); the film brush roller (6), the driving shaft (7), and the film placing roller (8) are rotatably arranged on the side wall of the rectangular frame (5) in sequence; the cutting assembly is installed in the rectangular frame (5), and the cutting assembly is arranged on a side of the film brush roller (6) away from the film placing roller (8); the mounting ends of the second motor (9) and the third motor (10) are both connected to the rectangular frame (5); the output shaft of the second motor (9) is connected to the cutting assembly; and the output shaft of the third motor (10) is connected to the driving shaft (7).

2. The automatic fixing device for the bottom film of a pallet according to claim 1, characterized in that: The tray (1) can pass between the film coating component and the conveying component, and the film roll (17) is arranged on the film coating component; the driving shaft (7) and the film placing roller (8) are arranged horizontally, and the film brush roller (6) is arranged on the upper side of the driving shaft (7); the driving shaft (7) and one end of the film placing roller (8) are connected through a second conveyor belt (11); the driving shaft (7) and the film brush roller (6) are both provided with meshing gears (12) at one end away from the second conveyor belt (11); the driving shaft (7) drives the film brush roller (6) to rotate through the meshing gear (12).

3. The automatic fixing device for the bottom film of a pallet according to claim 1, characterized in that: Limiting plates (13) are provided at both ends of the film placing roller (8), and the film roll (17) is arranged above the driving shaft (7) and the film placing roller (8), and is located between the two limiting plates (13).

4. The automatic fixing device for the bottom film of a pallet according to claim 1, characterized in that: The film brush roller (6) is provided with a plurality of evenly distributed rubber bristles (14), and the positions of the plurality of rubber bristles (14) correspond to the positions of the driving shaft (7).

5. The automatic fixing device for pallet bottom film according to claim 1, characterized in that: The cutting assembly comprises a ball screw, a cutting knife, a first sensor probe (18), a second sensor probe (19), a first sensor detection block (20), and a second sensor detection block (21); the lead screw (15) of the ball screw is rotatably arranged on the inner wall of a rectangular frame (5); the output shaft of the second motor (9) is connected to the lead screw (15); the cutting knife is arranged on one side of a nut (16) of the ball screw, and the cutting knife is located below the film brush roller (6) and the driving shaft (7); the first sensor probe (18) is arranged on the side of the nut (16) away from the second motor (9); the first sensor detection block (20) corresponding to the first sensor probe (18) is arranged on the rectangular frame (5); the second sensor probe (19) is arranged on the side of the nut (16) close to the second motor (9); and the second sensor detection block (21) corresponding to the second sensor probe (19) is arranged on the rectangular frame (5).

6. The automatic fixing device for pallet bottom film according to claim 1, characterized in that: The conveying assembly comprises a first conveyor belt (3), two mounting plates (2), and a first motor (4), wherein the two mounting plates (2) are arranged on both sides of the first conveyor belt (3), the mounting end of the first motor (4) is arranged on the mounting plates (2), and the output shaft of the first motor (4) is connected to the rotating shaft of the first conveyor belt (3); The rectangular frame (5) is arranged on the mounting plate (2).

7. The automatic fixing device for pallet bottom film according to claim 1, characterized in that: The fixing assembly comprises a first angle adjustment frame (22), a second angle adjustment frame (23), a third angle adjustment frame (24), a fourth angle adjustment frame (25), and four hot air guns (26); the first angle adjustment frame (22), the second angle adjustment frame (23), the third angle adjustment frame (24), and the fourth angle adjustment frame (25) are arranged on the mounting plate (2) and around the tray (1); and the ends of the first angle adjustment frame (22), the second angle adjustment frame (23), the third angle adjustment frame (24), and the fourth angle adjustment frame (25) are all provided with hot air guns (26).

8. The automatic fixing device for the bottom film of a pallet according to claim 6, characterized in that: A first photoelectric sensor (27), a second photoelectric sensor (28), and a third photoelectric sensor are provided on one side of the mounting plate (2); the first photoelectric sensor (27) and the second photoelectric sensor (28) are provided on the side of the mounting plate (2) where a fixing component is provided; the first photoelectric sensor (27) is provided on a side of the first angle adjustment frame (22) away from the second angle adjustment frame (23); the second photoelectric sensor (28) is provided between the second angle adjustment frame (23) and the rectangular frame (5); and the third photoelectric sensor is provided below the driving shaft (7).

9. The automatic fixing device for pallet bottom film according to claim 1, characterized in that: One end of the tray (1) is provided with a first photoelectric sensor block (30) corresponding to the first photoelectric sensor (27) and the third photoelectric sensor, and the other end of the tray (1) is provided with a second photoelectric sensor block (31) corresponding to the second photoelectric sensor (28).

10. The automatic fixing device for pallet bottom film according to claim 8, characterized in that: The first photoelectric sensor (27), the second photoelectric sensor (28), the third photoelectric sensor, the first photoelectric sensing block (30), the second photoelectric sensing block (31), the first sensor probe (18), the second sensor probe (19), the first sensor detection block (20), the second sensor detection block (21), the first motor (4), the second motor (9), and the third motor (10) are all electrically connected to the controller.

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