A four-piece corner cutting machine carton conveyor anti-deviation device

Abstract

This utility model discloses a carton conveying anti-deviation device for a four-unit corner cutting machine, including a conveyor frame, a controller, and functional components arranged along the conveying direction (X-axis). The conveyor frame contains conveying rollers, with symmetrically arranged correction components on both sides to adjust Y-axis deviation. A blocking component on the bottom frame positions the carton in the X-axis. A U-shaped lifting component on the uprights adjusts the height, connected to a pressing component above to stabilize Y-axis conveying, and a pushing component assists in X-axis alignment. The controller coordinates the control of all components. Through multi-dimensional anti-deviation, high-precision positioning, and height adaptation design, the device effectively solves the carton conveying deviation problem, improving corner cutting accuracy and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of cardboard box production equipment technology, and in particular to a cardboard box conveying anti-deviation device for a four-piece corner cutting machine. Background Technology

[0002] In the carton production process, the four-corner cutting machine is one of the key forming equipment. Its function is to cut four corners of the original cardboard to a predetermined size for subsequent folding into a box. The corner cutting process requires extremely high precision in the conveying and positioning of the carton. If the carton deviates in the width direction (Y direction) or the length direction (X direction) during the conveying process, it will lead to misalignment of the corner dimensions, rough edges, or even scrap, seriously affecting product yield and production efficiency.

[0003] Currently, existing carton conveying devices mainly suffer from the following problems: 1. Insufficient Y-axis anti-deviation capability: Traditional conveying devices mostly rely on a single conveyor roller drive and lack a dedicated width-direction correction mechanism. Due to uneven material, differences in conveyor roller friction, or equipment vibration, cartons are prone to deviation in the Y-axis, causing the corner cutting position to deviate from the design reference. 2. Low X-axis positioning accuracy: When a carton reaches the corner cutting station, the stop mechanism is usually triggered by a mechanical stop or a simple sensor, lacking dynamic positioning and push alignment functions, making it difficult to meet the strict requirements of high-precision corner cutting for X-axis position. 3. Poor height adaptability: The thickness of cartons of different specifications varies greatly. The pressure rollers or positioning components of traditional devices have fixed heights and cannot be flexibly adjusted to match the height of the cartons, easily leading to crushing of thin cartons or insufficient support causing thick cartons to wobble. 4. Lack of collaborative control: Each functional component (such as conveying, correction, and positioning) is mostly controlled independently, lacking real-time data interaction and linkage adjustment, making it difficult to cope with dynamic deviation problems in high-speed conveying scenarios, resulting in lag in adjustment and low efficiency.

[0004] Therefore, there is an urgent need for a carton conveying device that can achieve multi-dimensional anti-deviation, high-precision positioning, and strong adaptability to meet the high-efficiency and precise production requirements of the four-piece corner cutting machine. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a carton conveying anti-deviation device for a four-piece corner cutting machine.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: This utility model discloses a carton conveying anti-deviation device for a four-unit corner-cutting machine, comprising a conveyor frame, a controller, and functional components arranged sequentially along the conveying direction (defined as the X-axis). Multiple conveying rollers are arranged at intervals along the X-axis inside the conveyor frame to support and drive the carton forward along the X-axis. Correction components are symmetrically arranged on the left and right sides inside the conveyor frame to adjust the deviation of the carton in the width direction (defined as the Y-axis). A blocking component is provided on the bottom frame of the conveyor frame along the Y-axis to position the carton in the X-axis conveying position. The conveyor frame also has components on both sides along the vertical direction (defined as the Z-axis). An extended column is provided, on which a U-shaped lifting assembly is fixedly installed for adjusting the height of the pressing and pushing assemblies. A pressing assembly is fixedly connected to the side of the lifting slide of the U-shaped lifting assembly for lightly pressing the carton to stabilize the Y-axis conveying. A pushing assembly is fixedly connected to the other side of the lifting slide of the U-shaped lifting assembly for pushing the carton along the X-axis to assist in accurately aligning it with the corner cutting station. The controller is electrically connected to the conveying roller, the correction assembly, the blocking assembly, the U-shaped lifting assembly, the pressing assembly, and the pushing assembly, respectively, for receiving sensor signals from each assembly and controlling their coordinated operation.

[0007] As a preferred embodiment of this utility model, the correction assembly includes two sets of parallel horizontal lead screws rotatably mounted on the inner side of the lower part of the conveyor frame via bearing seats. The horizontal lead screws extend along the Y direction and are parallel to each other. A first drive motor is fixedly connected to the same end of each of the two sets of horizontal lead screws. The first drive motor is fixed to the outer side of the conveyor frame by bolts. A slider is threaded onto each horizontal lead screw, and two sets of sliders on the same side are fixedly connected by a sliding bracket. A second drive motor is fixed to the top of the sliding bracket by bolts. At least two sliding wheels are provided inside the sliding bracket along the X direction. The sliding wheels are rotatably mounted between the two side plates of the sliding bracket via bearings. Adjacent sliding wheels are connected by belt drive. The output end of the second drive motor is fixedly connected to the sliding wheel located at the end via a coupling. A first displacement sensor is also provided on the top of the sliding bracket. The first displacement sensor is electrically connected to the controller and is used to detect the offset of the carton in the Y direction and provide feedback to control the first drive motor.

[0008] As a preferred embodiment of this utility model, the blocking assembly includes a U-shaped blocking bracket fixed to the bottom frame of the conveyor frame by bolts. Two parallel guide shaft supports are spaced apart along the Y-direction on the top horizontal plate of the U-shaped blocking bracket. A blocking guide shaft is slidably inserted into each guide shaft support, and the top of the blocking guide shaft is connected to the guide shaft support via a linear bearing. A lifting cylinder is fixed above the top horizontal plate in the middle of the guide shaft support by bolts. The top of the piston rod of the lifting cylinder is fixedly connected to the bottom of the lifting baffle via a bushing. Both ends of the lifting baffle are fixedly connected to the tops of the two blocking guide shafts by bolts. A proximity sensor is provided on the top of the lifting baffle. The proximity sensor is electrically connected to the controller and is used to detect the carton's position signal in the X-direction and provide feedback to control the lifting cylinder.

[0009] As a preferred embodiment of this utility model, the U-shaped lifting assembly includes a lifting seat fixed to the two side columns of the conveyor frame by bolts. A lifting screw and a lifting guide shaft are arranged parallel to each other along the Z-direction inside the lifting seat. The top of the lifting screw is fixedly connected to the output end of a lifting drive motor via a coupling, and the lifting drive motor is fixed to the top of the lifting seat by bolts. A lifting slide is fitted onto both the lifting screw and the lifting guide shaft. The lifting slide is threaded to the lifting screw and slidably engaged with the lifting guide shaft. A limit switch is provided on the inner wall of the lifting seat along the Z-direction. The limit switch is electrically connected to the controller and is used to limit the stroke of the lifting slide.

[0010] As a preferred embodiment of this utility model, the pressing assembly includes a pressing fixing bracket fixed to the side of the lifting slide by bolts. The pressing fixing bracket is an L-shaped frame structure, with a first elastic pressure roller and a second elastic pressure roller hinged to its inner side by a pin. The first elastic pressure roller is located on the same side of the second elastic pressure roller in the Y direction. Both are rubber-coated rollers, and pressure springs are provided inside the rollers to provide adjustable elastic pressure. A pressure sensor is also provided on the top of the pressing fixing bracket. The pressure sensor is electrically connected to the controller to detect the pressure of the elastic pressure rollers on the carton and provide feedback control.

[0011] As a preferred embodiment of this utility model, the pushing assembly includes a pushing fixing bracket fixed to the side of the lifting slide by bolts. A swing cylinder is provided on the front side of the pushing fixing bracket along the X-direction. The top end of the piston rod of the swing cylinder is hinged to the rear side of the rotating block via a pin. The front side of the rotating block is hinged to the front side of the pushing fixing bracket via a rotating shaft. The bottom of the rotating block is fixedly connected to the rear side of the pushing bracket by bolts. The pushing bracket is an L-shaped plate structure, with a pushing plate fixedly connected to its bottom front end along the X-direction. The swing cylinder drives the rotating block to swing around the rotating shaft, driving the pushing plate to reciprocate along the X-direction, thereby pushing the carton to the longitudinal alignment and corner cutting station. A second displacement sensor is provided at the bottom of the pushing plate, electrically connected to the controller, for detecting the pushing distance of the pushing plate in the X-direction and providing feedback to control the swing cylinder.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. Correction components are symmetrically set on both sides of the conveyor frame. The sliding bracket is driven to move along the Y direction by a horizontal screw. With the belt drive of the second drive motor, the offset of the carton in the width direction can be adjusted in real time. At the same time, the first displacement sensor detects the Y position in real time and feeds it back to the controller to form a closed-loop control, which effectively avoids the Y offset caused by uneven friction or vibration, and ensures that the width direction of the carton is aligned with the corner cutting station reference. 2. The blocking component drives the lifting baffle to rise through the lifting cylinder, and the proximity sensor detects the X-axis positioning signal of the carton to achieve coarse positioning; the pushing component drives the rotating block to swing through the swing cylinder, which drives the pushing plate to move back and forth along the X-axis. With the feedback of the pushing distance from the second displacement sensor, the carton can be accurately pushed to the designated position of the corner cutting station, solving the problem of ambiguous X-axis positioning in traditional devices. The corner cutting size error can be controlled within ±0.5mm, which greatly reduces the scrap rate. 3. The U-shaped lifting assembly, through the cooperation of the lifting screw and the lifting guide shaft, can drive the lifting slide to move along the Z-axis, flexibly adjusting the height of the pressing and pushing components to adapt to cartons of different thicknesses (e.g., 1-5mm). The rubber-coated roller body and internal pressure spring design of the elastic pressure roller provide sufficient friction to prevent slippage during conveying, while avoiding the crushing of thin cartons by rigid pressure, thus balancing stability and protection. 4. The controller coordinates sensor signals (such as first / second displacement sensors, proximity sensors, and pressure sensors) from various modules including the conveyor rollers, correction components, and blocking components to achieve coordinated adjustment of conveying speed, correction amount, positioning position, and pressure roller pressure. For example, when a Y-axis offset of the carton is detected, the controller synchronously adjusts the operating parameters of the horizontal lead screw and the second drive motor to ensure that the conveying and correction actions are completed simultaneously, reducing downtime and improving the overall production efficiency of the four-piece corner trimming machine. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is the front view of this utility model; Figure 3 This is a top view of the present invention; Figure 4 This is a side view of the present invention; Figure 5 This is a cross-sectional structural schematic diagram of the present invention; In the diagram: 1. Conveyor frame; 2. Correction assembly; 3. Blocking assembly; 4. U-shaped lifting assembly; 5. Pressing assembly; 6. Pushing assembly; 7. Controller; 11. Conveyor roller; 12. Column; 21. Horizontal lead screw; 22. First drive motor; 23. Slider; 24. Sliding bracket; 25. Second drive motor; 26. Pulley; 27. Belt; 28. First displacement sensor; 31. U-shaped blocking bracket; 32. Guide shaft support; 33. Blocking guide shaft; 34. Lifting cylinder 35. Lifting baffle; 36. Proximity sensor; 41. Lifting seat; 42. Lifting screw; 43. Lifting guide shaft; 44. Lifting drive motor; 45. Lifting slide; 46. Limit switch; 51. Downward fixed bracket; 52. First elastic pressure roller; 53. Second elastic pressure roller; 54. Pressure sensor; 55. Pressure spring; 61. Push fixed bracket; 62. Swing cylinder; 63. Rotating block; 64. Push bracket; 65. Second displacement sensor; 66. Push plate. Detailed Implementation

[0014] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0015] In the attached diagram, all identical reference numerals refer to the same components.

[0016] Example 1: Anti-deviation device for carton conveying in a standard four-piece corner trimmer like Figure 1-5 As shown, this embodiment is an anti-deviation device suitable for cartons of standard thickness (2-4mm), and its specific structure is as follows: The conveyor frame 1 is a rectangular frame structure made of channel steel. Inside, there are 8 conveyor rollers 11 arranged at intervals along the X-direction of the conveying direction. The two ends of the conveyor rollers 11 are connected to the two side plates of the conveyor frame 1 through bearing seats. The conveyor rollers 11 closer to the power source are the active rollers, which are driven to rotate by an external motor. The rest are driven rollers, which drive the carton to be conveyed along the X-direction by friction.

[0017] Please see the appendix Figure 2 , Figure 3 Inside the conveyor frame 1, symmetrical correction components 2 are arranged on the left and right sides. Each correction component 2 includes two sets of parallel horizontal lead screws 21. The horizontal lead screws 21 are fixed to the lower inner side of the conveyor frame 1 by bearing seats and extend along the width direction of Y. The right end of each set of horizontal lead screws 21 is fixedly connected to a first drive motor 22. The first drive motor 22 is fixedly connected to the outer plate of the conveyor frame 1 by bolts, and the output end is keyed to the horizontal lead screw 21. A slider 23 is threaded on the horizontal lead screw 21. Two sliders 23 on the same side are fixedly connected by a sliding bracket 24. The top of the sliding bracket 24 is fixed with a second drive motor 25 by countersunk bolts. Inside the sliding bracket 24, there are three sliding wheels 26 along the X direction. The sliding wheels 26 are rotatably connected to the two side plates of the sliding bracket 24 by deep groove ball bearings. Adjacent sliding wheels 26 are driven by a rubber belt 27. The output shaft of the second drive motor 25 is connected to the end sliding wheel 26 by a flexible coupling, driving the belt 27 and the carton to move along the X direction. The first displacement sensor 28 is fixed to the top left side of the sliding bracket 24 by bolts. Its detection end faces the side of the carton and is used to detect the Y-axis offset and feed it back to the controller 7.

[0018] Please see the appendix Figure 4 The bottom frame of the conveyor frame 1 is provided with a blocking component 3 along the Y direction: a U-shaped blocking bracket 31 is fixedly connected to the bottom frame of the conveyor frame 1 by welding, and its top horizontal plate has two through holes spaced apart along the Y direction. A linear bearing is fixed in the through hole. The guide shaft support 32 is fixedly connected to the top horizontal plate by bolts. The blocking guide shaft 33 passes through the guide shaft support 32, with the lower end limited by the shaft shoulder and the upper end extending out. The lifting cylinder 34 is fixed above the top horizontal plate in the middle position of the guide shaft support 32 by bolts. The top end of its piston rod is fixedly connected to the bottom center of the lifting baffle 35 by the bushing. The two ends of the lifting baffle 35 are fixed to the top of the blocking guide shafts 33 on both sides by bolts. A proximity sensor 36 is fixed to the top left by bolts, with the detection end facing the conveying direction, for detecting the X-direction positioning signal of the carton.

[0019] U-shaped lifting components 4 are fixedly installed on the two side columns 12 of the conveyor frame 1: the lifting seat 41 is fixedly connected to the side of the column 12 by welding, and the lifting screw 42 and the lifting guide shaft 43 are provided in the vertical direction of Z inside. The upper end of the lifting screw 42 is connected to the output shaft of the lifting drive motor 44 through a coupling. The lifting drive motor 44 is fixed to the top of the lifting seat 41 by bolts; the lifting slide 45 is sleeved on the lifting screw 42 and the lifting guide shaft 43, and is threaded with the lifting screw 42 and slides in contact with the lifting guide shaft 43; the inner wall of the lifting seat 41 is provided with two limit switches 46 along the Z direction, which are located at the upper and lower stroke ends of the lifting slide 45 respectively, to limit its movement range.

[0020] Please see the appendix Figure 2 The left side of the lifting slide 45 of the U-shaped lifting assembly 4 is fixed with a pressing assembly 5 by bolts. The pressing fixing bracket 51 is an L-shaped angle iron, and the upper inner end is hinged with a first elastic pressure roller 52 and a second elastic pressure roller 53 by a pin. The two are arranged in parallel and are both located above the conveying roller 11. The first elastic pressure roller 52 and the second elastic pressure roller 53 are both rubber-coated roller bodies, hollow inside and embedded with a helical pressure spring 55. The two ends of the spring are fixed to the two end faces of the roller body respectively to provide axial elastic pressure. The right side of the top of the pressing fixing bracket 51 is fixed with a pressure sensor 54 by bolts. Its detection end is in contact with the roller shaft of the first elastic pressure roller 52 to detect the pressure value and feed it back to the controller 7.

[0021] The right side of the lifting slide 45 is bolted to a pushing assembly 6: the pushing fixed bracket 61 is a rectangular steel plate, and the middle of the front side is hinged to a swing cylinder 62 by a pin. The top of the piston rod of the swing cylinder 62 is hinged to the rear side of the rotating block 63 by a pin. The front side of the rotating block 63 is rotatably connected to the front side of the pushing fixed bracket 61 by a rotating shaft. The bottom of the rotating block 63 is fixed to the rear side of the pushing bracket 64 by countersunk bolts. The pushing bracket 64 is an L-shaped plate, and a pushing plate 66 is welded to the bottom front end along the X direction. The lower end of the pushing plate 66 is flush with the top surface of the conveying roller 11. When the swing cylinder 62 extends or retracts, it drives the rotating block 63 to swing, which drives the pushing plate 66 to swing back and forth along the X direction. The bottom left side of the pushing plate 66 is bolted to a second displacement sensor 65, with the detection end facing the conveying direction, for detecting the pushing distance.

[0022] The controller 7 is a PLC controller, installed in the electrical box outside the conveyor frame 1. Its input terminals are electrically connected to the encoder of the conveyor roller 11, the first displacement sensor 28, the proximity sensor 36, the pressure sensor 54, the second displacement sensor 65, and the limit switch 46, respectively. Its output terminals are electrically connected to the first drive motor 22, the second drive motor 25, the lifting cylinder 34, the lifting drive motor 44, and the swing cylinder 62, respectively. It coordinates the actions of each component through a preset program.

[0023] Example 2: Anti-deviation device for thin cardboard boxes (compatible with 1-3mm cardboard boxes) The difference between this embodiment and Embodiment 1 lies in the optimization of the parameters of the pressing component 5 and the pushing component 6 to accommodate thinner cartons: the thickness of the adhesive layer of the elastic pressure rollers 52 and 53 of the pressing component 5 is reduced to 2mm (compared to 3mm in the conventional case), the elastic coefficient of the pressure spring 55 is reduced, and the detection threshold of the pressure sensor 54 is adjusted to 0.5-1.5N (compared to 1.5-3N in the conventional case), to avoid crushing the thin cartons due to excessive pressure. The stroke of the swing cylinder 62 of the pushing component 6 is shortened by 10%, the thickness of the pushing plate 66 is reduced to 3mm (compared to 5mm in the conventional case), and the detection accuracy of the second displacement sensor 65 is improved to 0.1mm (compared to 0.2mm in the conventional case), ensuring the positional accuracy of the thin cartons when pushed in the X direction.

[0024] Example 3: Wide-width Carton Anti-deviation Device (Suitable for cartons with a width of 1200-1800mm) The difference between this example and Example 1 lies in the structural reinforcement of the correction component 2 and the U-shaped lifting component 4: The diameter of the horizontal lead screw 21 of the correction component 2 is increased to 20mm (compared to 16mm in the conventional version), the width of the sliding bracket 24 is increased to 150mm (compared to 120mm in the conventional version), the number of sliding wheels 26 is increased to 4 (compared to 3 in the conventional version), and the width of the belt 27 is increased to 25mm (compared to 20mm in the conventional version) to improve the rigidity and stability of the Y-axis correction. The lead of the lifting lead screw 42 of the U-shaped lifting component 4 is increased to 10mm (compared to 8mm in the conventional version), the diameter of the lifting guide shaft 43 is increased to 18mm (compared to 15mm in the conventional version), and the number of limit switches 46 is increased to 4 (compared to 2 in the conventional version), respectively located at 1 / 3, 2 / 3, and the end position of the vertical stroke of the lifting slide 45, to adapt to the higher center of gravity of the wide-width cartons and prevent swaying during lifting.

[0025] In summary, this utility model, through targeted designs in different embodiments, covers the anti-deviation requirements of conveying various carton specifications such as regular, thin, and wide cartons, and verifies the versatility and reliability of the device structure.

[0026] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A four-way corner cutter carton conveying anti- drift device, characterized in that, The system includes a conveyor frame (1), a controller (7), and functional components arranged sequentially along the conveying direction (defined as the X direction). Multiple conveying rollers (11) are spaced apart along the X direction inside the conveyor frame (1) to support and drive the cartons forward along the X direction. Correction components (2) are symmetrically arranged on the left and right sides inside the conveyor frame (1) to adjust the offset of the cartons in the width direction (defined as the Y direction). A blocking component (3) is provided on the bottom frame of the conveyor frame (1) along the Y direction to position the cartons in the X direction. Vertical columns (12) extending along the vertical direction (defined as the Z direction) are provided on both sides of the conveyor frame (1), and U-shaped lifting devices are fixedly installed on the columns (12). Component (4) is used to adjust the height of the pressing component (5) and the pushing component (6); the pressing component (5) is fixedly connected to the side of the lifting slide (45) of the U-shaped lifting component (4) for lightly pressing the carton to stabilize the Y-axis conveying; the pushing component (6) is fixedly connected to the other side of the lifting slide (45) of the U-shaped lifting component (4), and the pushing component (6) is used to push the carton along the X-axis to assist it in accurately aligning with the corner cutting station; the controller (7) is electrically connected to the conveying roller (11), the correction component (2), the blocking component (3), the U-shaped lifting component (4), the pressing component (5) and the pushing component (6) respectively, and is used to receive the sensor signals of each component and control their coordinated action.

2. The anti-derailment device for a carton conveying system of a four-way trimmer according to claim 1, wherein The correction assembly (2) includes two sets of parallel horizontal lead screws (21) rotatably mounted on the inner side of the lower part of the conveyor frame (1) via bearing seats. The horizontal lead screws (21) extend along the Y direction and are parallel to each other. A first drive motor (22) is fixedly connected to the same end of the two sets of horizontal lead screws (21). The first drive motor (22) is fixed to the outside of the conveyor frame (1) by bolts. A slider (23) is threaded onto the horizontal lead screw (21). The two sets of sliders (23) on the same side are fixedly connected by a sliding bracket (24). A second drive motor is fixed to the top of the sliding bracket (24) by bolts. (25) The interior is provided with at least two sliding wheels (26) along the X direction. The sliding wheels (26) are rotatably disposed between the two side plates of the sliding bracket (24) through bearings. The adjacent sliding wheels (26) are connected by a belt (27). The output end of the second drive motor (25) is fixedly connected to the sliding wheel (26) located at the end through a coupling. The top of the sliding bracket (24) is also provided with a first displacement sensor (28). The first displacement sensor (28) is electrically connected to the controller (7) and is used to detect the offset of the carton in the Y direction and provide feedback control to the first drive motor (22).

3. The anti-derailment device for a carton conveying system of a four-way trimmer as recited in claim 1, wherein, The blocking assembly (3) includes a U-shaped blocking bracket (31) fixed to the bottom frame of the conveyor frame (1) by bolts. The top horizontal plate of the U-shaped blocking bracket (31) is provided with two parallel guide shaft supports (32) spaced apart along the Y direction. A blocking guide shaft (33) is slidably inserted in the guide shaft support (32). The top of the blocking guide shaft (33) is connected to the guide shaft support (32) by a linear bearing. A lifting cylinder (34) is fixed above the top horizontal plate in the middle of the guide shaft support (32) by bolts. The top of the piston rod of the lifting cylinder (34) is fixedly connected to the bottom of the lifting baffle (35) by a bushing. The two ends of the lifting baffle (35) are respectively fixedly connected to the top of the two blocking guide shafts (33) by bolts. The top of the lifting baffle (35) is provided with a proximity sensor (36). The proximity sensor (36) is electrically connected to the controller (7) and is used to detect the position signal of the carton in the X direction and feed back to control the lifting cylinder (34).

4. The anti-derailment device for a carton conveying system of a four-way trimmer as recited in claim 1, wherein, The U-shaped lifting assembly (4) includes a lifting seat (41) fixed to the columns (12) on both sides of the conveyor frame (1) by bolts. The lifting seat (41) has a lifting screw (42) and a lifting guide shaft (43) arranged parallel to each other along the Z direction inside. The top of the lifting screw (42) is fixedly connected to the output end of the lifting drive motor (44) by a coupling. The lifting drive motor (44) is fixed to the top of the lifting seat (41) by bolts. The lifting screw (42) and the lifting guide shaft (43) are fitted together with a lifting slide (45). The lifting slide (45) is threaded to the lifting screw (42) and slides with the lifting guide shaft (43). The inner wall of the lifting seat (41) is provided with a limit switch (46) along the Z direction. The limit switch (46) is electrically connected to the controller (7) and is used to limit the stroke of the lifting slide (45).

5. The anti-derailment device for a carton conveying system of a four-way trimmer according to claim 4, wherein The pressing assembly (5) includes a pressing fixing bracket (51) fixed to the side of the lifting slide (45) by bolts. The pressing fixing bracket (51) is an L-shaped frame structure, and a first elastic pressure roller (52) and a second elastic pressure roller (53) are hinged to its inner side by a pin. The first elastic pressure roller (52) is located on the same side of the second elastic pressure roller (53) in the Y direction. Both are rubber-coated rollers, and a pressure spring (55) is provided inside the roller to provide adjustable elastic pressure. A pressure sensor (54) is also provided on the top of the pressing fixing bracket (51). The pressure sensor (54) is electrically connected to the controller (7) to detect the pressure of the elastic pressure roller on the carton and provide feedback control.

6. The anti-derailment device for a carton conveying system of a four-way trimmer as recited in claim 4, wherein, The pushing assembly (6) includes a pushing fixing bracket (61) fixed to the side of the lifting slide (45) by bolts. A swing cylinder (62) is provided on the front side of the pushing fixing bracket (61) perpendicular to the X-direction. The top end of the piston rod of the swing cylinder (62) is hinged to the rear side of the rotating block (63) via a pin. The front side of the rotating block (63) is hinged to the front side of the pushing fixing bracket (61) via a rotating shaft. The bottom of the rotating block (63) is fixedly connected to the rear side of the pushing bracket (64) by bolts. The bracket (64) is an L-shaped plate structure, and a push plate (66) is fixedly connected to its bottom front end along the X direction; the swing cylinder (62) drives the rotating block (63) to swing around the rotating shaft, and drives the push plate (66) to move back and forth along the X direction, thereby pushing the carton longitudinally aligned to the corner cutting station; the bottom of the push plate (66) is provided with a second displacement sensor (65), which is electrically connected to the controller (7) and is used to detect the pushing distance of the push plate (66) in the X direction and provide feedback to control the swing cylinder (62).

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