High-hardness packaging box folding device

Abstract

The invention discloses a high-hardness packaging box folding device, and relates to the technical field of packaging box manufacturing. Comprising two supports, the two supports are jointly provided with two symmetrically-distributed supporting plates, the two supporting plates are jointly and slidably connected with a first limiting rod and two symmetrically-distributed second limiting rods, the first limiting rod is slidably connected with two limiting frames, the limiting frames are slidably connected with symmetrically-distributed guiding sleeves, and the guiding sleeves are slidably connected with the supporting plates. A support is arranged between the two brackets, the support is fixedly connected with arc-shaped guide frames which are symmetrically distributed, the arc-shaped guide frames are provided with arc-shaped plates, and the arc-shaped plates are fixedly connected with extrusion plates. Through mutual cooperation of the first limiting rod and the two second limiting rods, the maximum bending angle of the position, needing to be bent, of a material is limited in real time according to the hardness and thickness of the material, stable change of tension of the position, needing to be bent, of the material is guaranteed, the tearing condition is reduced, and the integrity of the material protection function is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of packaging box manufacturing technology, and in particular to a high-hardness packaging box folding device. Background Technology

[0002] The packaging box folding device is an automated equipment that replaces traditional manual methods. It automatically folds die-cut and creasing cardboard into a box shape to facilitate subsequent gluing and fixing. The required rigidity of the packaging box varies depending on the quality and value of the goods.

[0003] Because existing folding devices only use robotic arms or bending plates to bend cardboard at a fixed speed and with a fixed force, they cannot limit the speed at which the bending angle changes. If the bending speed of the folding device is the same when folding high-thickness, high-hardness cardboard as when folding low-thickness, low-hardness cardboard, the outer side of the high-thickness, high-hardness cardboard at the bend is prone to tearing due to tension control. This not only affects the appearance but also reduces the protective effect on the goods. Summary of the Invention

[0004] This invention provides a high-rigidity packaging box folding device to overcome the shortcomings mentioned in the background art.

[0005] The technical solution is as follows: A high-hardness packaging box folding device includes two supports, each of which is equipped with a conveying module. The two supports share two symmetrically distributed support plates. The two support plates are slidably connected to a first limiting rod and two symmetrically distributed second limiting rods. The first limiting rod is located above the two second limiting rods and is slidably connected to two limiting frames. Each limiting frame has two symmetrically distributed fan-shaped through holes and is slidably connected to symmetrically distributed guide sleeves. The guide sleeves are located within the corresponding fan-shaped through holes, and the two guide sleeves are used to guide the movement of the corresponding second limiting rods. A support is provided between the two supports, and the support is hinged to two symmetrically distributed pairs of hydraulic push rods. The support is fixed to symmetrically distributed arc-shaped guide frames, each arc-shaped guide frame having an arc-shaped plate. The arc-shaped guide frame guides the corresponding arc-shaped plate, and the arc-shaped plate is fixed to a pressing plate. The same pair of hydraulic push rods are used to drive the movement of the corresponding arc-shaped plate.

[0006] As a further preferred embodiment, the support plate is slidably connected to a mounting bracket, the mounting bracket is rotatably connected to a first screw, the first screw is threadedly connected to the corresponding support plate, the first screw is fixedly connected to a crank handle, and the mounting bracket is fixedly connected to rectangularly distributed limiting blocks, the limiting blocks being used to lock themselves onto the corresponding bracket.

[0007] As a further preferred embodiment, the conveying module has a plurality of first conveyor belts and a plurality of second conveyor belts, the plurality of first conveyor belts and the plurality of second conveyor belts being arranged in an alternating pattern, the first conveyor belts and the second conveyor belts having different lengths.

[0008] As a further preferred embodiment, the limiting frame is slidably connected to a guide frame, the guide frame is equipped with an electric push rod, and the telescopic end of the electric push rod is fixedly connected to the corresponding limiting frame.

[0009] As a further preferred embodiment, the two support plates are rotatably connected by symmetrically distributed second screws, and the guide frame is threadedly connected to both the symmetrically distributed second screws.

[0010] As a further preferred embodiment, one of the guide sleeves on the limiting frame is fixedly connected to a mounting plate, the mounting plate is threadedly connected to a first bolt, the limiting frame is provided with a guide groove, the guide groove is used to limit the position of the first bolt, the first bolt is used to lock the mounting plate to the limiting frame, the guide sleeve is fixedly connected to an arc-shaped rack, and two arc-shaped racks corresponding to the same limiting frame mesh with each other.

[0011] As a further preferred embodiment, the limiting frame is provided with a guide ramp for guiding the material on the side away from the corresponding support plate.

[0012] As a further preferred embodiment, it also includes symmetrically distributed sliding columns, which are slidably connected to different arc-shaped guide frames. The telescopic ends of the same pair of hydraulic push rods are hinged to the corresponding sliding columns. Each sliding column is slidably connected to a sliding block. Each sliding column is slidably connected to a corresponding arc-shaped plate. Each arc-shaped plate is slidably connected to equidistantly distributed limiting protrusions. An elastic element is fixed between the limiting protrusions and the corresponding arc-shaped plate.

[0013] As a further preferred embodiment, the limiting protrusion is provided with an inclined surface, the inclined surface of the limiting protrusion gradually moves away from the side away from the extrusion plate to the side closer to the corresponding sliding block, and the sliding block is used to press the inclined surface of the corresponding limiting protrusion.

[0014] As a further preferred embodiment, the sliding column is fixedly connected to an n-shaped bracket, and the n-shaped bracket is threadedly connected to a second bolt that is rotatably connected to the corresponding sliding block.

[0015] Compared with existing similar technologies, this invention has at least the following advantages: Through the cooperation of the first limiting rod and two second limiting rods, this invention limits the maximum bending angle of the material at the required bending position in real time according to the material's hardness and thickness, ensuring stable tension changes at the required bending point, reducing tearing, and ensuring the integrity of the material protection function; through the relative sliding of the limiting protrusion and the arc plate, when the material's reverse force on the extrusion plate is too large, the limiting protrusion retracts into the arc plate and temporarily interrupts the extrusion relationship between the sliding block and the limiting protrusion, thereby pausing the extrusion plate's extrusion action on the material, and using the extrusion plate's own weight to separate from the material. Multiple reciprocating bending actions avoid direct hard extrusion that could cause tearing of the cardboard, ensuring the integrity of the cardboard. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a three-dimensional structural diagram of the mounting bracket of the present invention;

[0018] Figure 3 This is a three-dimensional structural diagram of the support plate and the support of the present invention;

[0019] Figure 4 This is a three-dimensional structural diagram of the first and second limiting rods of the present invention;

[0020] Figure 5 This is an exploded view of the support plate, mounting bracket, and guide frame of the present invention;

[0021] Figure 6 This is a three-dimensional structural diagram of the fan-shaped through hole and mounting plate of the present invention;

[0022] Figure 7 This is a three-dimensional structural diagram of the guiding inclined plane of the present invention;

[0023] Figure 8 This is a three-dimensional structural diagram of the hydraulic push rod and extrusion plate of the present invention;

[0024] Figure 9 This is a three-dimensional structural diagram of the arc-shaped guide frame and arc-shaped plate of the present invention;

[0025] Figure 10 This is a three-dimensional structural diagram of the sliding block and the limiting protrusion of the present invention;

[0026] Figure 11 This is a three-dimensional structural diagram of the n-shaped frame and the second bolt of the present invention.

[0027] Wherein: 1-bracket, 2-conveyor module, 201-first conveyor belt, 202-second conveyor belt, 3-support plate, 4-first limiting rod, 5-second limiting rod, 6-limiting frame, 7-guide sleeve, 701-support, 702-hydraulic push rod, 703-arc guide frame, 704-arc plate, 705-extrusion plate, 8-mounting frame, 9-first screw, 10-handle, 11-limiting block, 12-guide frame, 13-electric push rod, 14-second screw, 15-fan-shaped through hole, 16-mounting plate, 1601-first bolt, 17-guide groove, 18-arc rack, 19-guide inclined surface, 20-sliding column, 21-sliding block, 22-limiting protrusion, 23-n-shaped frame, 24-second bolt. Detailed Implementation

[0028] To make the above features and advantages of the present invention more easily understood, specific embodiments are described below in conjunction with the accompanying drawings. However, the present invention is not limited thereto. The material processed by this device is high-hardness corrugated cardboard, and the following description will use cardboard as a simple reference.

[0029] Existing folding devices only use robotic arms or bending plates to bend cardboard at a fixed speed and with a fixed force, and cannot limit the speed at which the bending angle changes. If the bending speed of the folding device is the same when folding high-thickness, high-hardness cardboard as when folding low-thickness, low-hardness cardboard, the outer side of the high-thickness, high-hardness cardboard at the bend is prone to tearing due to tension control, which not only affects the appearance but also reduces the protective effect on the goods.

[0030] Example 1

[0031] A high-hardness packaging box folding device, as described in the reference Figures 1-10As shown, the device includes two supports 1, each equipped with a conveying module 2. Both supports 1 share two symmetrically distributed support plates 3. The two support plates 3 are slidably connected to a first limiting rod 4 and two symmetrically distributed second limiting rods 5. The first limiting rod 4 is located above the two second limiting rods 5. The first limiting rod 4 is slidably connected to two front and rear limiting frames 6. Each limiting frame 6 has a guide slope 19 on the side away from the corresponding support plate 3 for guiding the cardboard. Each limiting frame 6 has two symmetrically distributed fan-shaped through holes 15. Each limiting frame 6 is slidably connected to symmetrically distributed guide sleeves 7, which are located within their respective fan-shaped through holes 15. The two guide sleeves 7 are used to guide the corresponding second... The movement of the limiting rod 5 is restricted. A support 701 is provided between the two brackets 1. The support 701 is hinged to two pairs of symmetrically distributed hydraulic push rods 702. The support 701 is fixed to two pairs of symmetrically distributed arc-shaped guide frames 703. The arc-shaped guide frames 703 are provided with arc-shaped plates 704. The arc-shaped guide frames 703 are used to guide the corresponding arc-shaped plates 704. The arc-shaped plates 704 are fixed to the pressing plates 705. The same pair of hydraulic push rods 702 are used to drive the corresponding arc-shaped plates 704 to move. The conveying module 2 has several first conveyor belts 201 and several second conveyor belts 202. The several first conveyor belts 201 and several second conveyor belts 202 are arranged in an alternating pattern. The lengths of the first conveyor belts 201 and the second conveyor belts 202 are different.

[0032] In the above scheme, the first limiting rod 4 slides up and down on the support plate 3, and the second limiting rod 5 is connected to the support plate 3 in a limiting sliding connection. The second limiting rod 5 can only slide left and right on the support plate 3. The first conveyor belt 201 is longer than the second conveyor belt 202. The extrusion plate 705 extends between adjacent first conveyor belts 201. The extrusion plate 705 is "E" shaped. By limiting the length of the first conveyor belt 201 and the second conveyor belt 202 and the shape of the extrusion plate 705, the range in which the cardboard loses power and suspends in the air is reduced. The first limiting rod 4 is used to limit the upper part of the cardboard at the bending point. The two second limiting rods... Rods 5 are used to restrict the lower left and right sides of the area to be bent in the cardboard. The lateral movement of the second limiting rod 5 is controlled according to the cardboard thickness to adjust its distance from the lower part of the cardboard to be bent, thus limiting the area of ​​the lower part of the bend. The thicker the cardboard, the larger the area of ​​the lower part of the bend; the thinner the cardboard, the smaller the area of ​​the lower part of the bend, reducing the probability of tearing at the bend and ensuring the quality of the cardboard after bending. The lower part of the guide sleeve 7 has a protrusion, and the limiting frame 6 has a limiting groove on the lower side of the fan-shaped through hole 15 to guide the protrusion of the guide sleeve 7. The guiding inclined surface 19 is used to guide the cardboard from right to left. Transporting to the left, the two guide ramps 19 are located on the right side of the two opposing restraining frames 6, and gradually slope upward from left to right. When the cardboard moves to the left to the restraining frame 6, the guide ramps 19 of the restraining frame 6 guide the cardboard, causing it to move to the lower part of the opposing sides of the two restraining frames 6 and the lower part of the first restraining rod 4, so that the first restraining rod 4 restricts the cardboard. The distance between the two guide sleeves 7 on the same restraining frame 6 gradually increases from top to bottom to adjust the distance between the two second restraining rods 5. The central axes of the circles containing the cross-sections of the two pairs of arc-shaped guide frames 703 are collinear and both are located on the first restraining rod 4. Below; In this embodiment, the telescopic end of the hydraulic push rod 702 and the corresponding arc plate 704 are considered to be in a hinged relationship. The same pair of hydraulic push rods 702 are used to drive the arc plate 704 to rotate along the axis of the circle where the arc guide frame 703 is located, so that the arc plate 704 drives the extrusion plate 705 to perform a bending action on the cardboard; The center of the circle corresponding to the fan-shaped through hole 15 is located on its upper side. Through the description of the fan-shaped through hole 15 and the description of the relationship between the guide sleeve 7 and the fan-shaped through hole 15, the guide sleeve 7 can swing in the fan-shaped through hole 15, and the center of the swing coincides with the center of the fan-shaped through hole 15.

[0033] Reference Figures 1-5 As shown, the support plate 3 is slidably connected to the mounting bracket 8, the mounting bracket 8 is rotatably connected to the first screw 9, the first screw 9 is threadedly connected to the corresponding support plate 3, the first screw 9 is fixedly connected to the crank handle 10, and the mounting bracket 8 is fixedly connected to the rectangularly distributed limiting blocks 11, which are used to lock themselves onto the corresponding bracket 1.

[0034] In the above scheme, the mounting frame 8 consists of a flat plate and four connecting rods. The connecting rods of the mounting frame 8 are slidably connected to the corresponding support plate 3. By rotating the rocker handle 10, the first screw 9 moves relative to the support plate 3. Due to the fixed length of the second limiting rod 5, when the limiting block 11 contacts the bracket 1, the distance between the mounting frame 8 and the corresponding support plate 3 cannot continue to increase, so as to fix the mounting frame 8 and the support plate 3 between the two brackets 1.

[0035] Reference Figures 1-5 As shown, the limiting frame 6 is slidably connected to the guide frame 12, the guide frame 12 is equipped with an electric push rod 13, the telescopic end of the electric push rod 13 is fixedly connected to the corresponding limiting frame 6, and the two support plates 3 are rotatably connected with symmetrically distributed second screws 14, and the guide frame 12 and the symmetrically distributed second screws 14 are all threadedly connected.

[0036] In the above scheme, the guide frame 12 is used to restrict the limiting frame 6, and the distance between the two limiting frames 6 and the two guide frames 12 is adjusted by the joint rotation of the two second screws 14 to accommodate cardboard of different widths and improve the applicability of the device; the telescopic end of the electric push rod 13 drives the limiting frame 6 to move down and detects the thickness of the cardboard during the downward movement, so as to change the degree of restriction of the bending angle by the two second limiting rods 5 under the initial condition.

[0037] Reference Figures 5-7 As shown, one of the guide sleeves 7 on the limiting frame 6 is fixedly connected to a mounting plate 16, and the mounting plate 16 is threadedly connected to a first bolt 1601. The limiting frame 6 is provided with a guide groove 17, which is used to limit the position of the first bolt 1601. The first bolt 1601 is used to lock the mounting plate 16 to the limiting frame 6. The guide sleeve 7 is fixedly connected to an arc-shaped rack 18, and two corresponding arc-shaped racks 18 on the same limiting frame 6 mesh with each other.

[0038] In the above scheme, the guide groove 17 is arc-shaped, and the center of the circle corresponding to the arc coincides with the center of the corresponding fan-shaped through hole 15. By controlling the position of the first bolt 1601 in the guide groove 17, the tilt angle of the corresponding guide sleeve 7 is changed. By utilizing the meshing relationship of the two arc-shaped racks 18, the tilt angles of the two guide sleeves 7 change synchronously, thereby changing the movement path of the second limiting rod 5: if the cardboard hardness is higher, the included angle between the two guide sleeves 7 is larger; if the cardboard hardness is lower, the included angle between the two guide sleeves 7 is smaller, so as to adjust the distance between the two second limiting rods 5 for cardboard of different thicknesses, thereby improving the applicability of this device.

[0039] Working principle: When using this device to bend cardboard, the tilt angle of the guide sleeve 7 is adjusted according to the cardboard's hardness to adjust the subsequent movement of the second limiting rod 5 relative to the limiting frame 6. Simultaneously, the two second screws 14 are rotated according to the cardboard's width to change the distance between the two guide frames 12. After adjustment, the two conveying modules 2 are activated, and the cardboard with the indentation is placed on the right conveying module 2. The right conveying module 2 transports the cardboard between the two conveying modules 2, ensuring the first indentation on the cardboard is below the first limiting rod 4 and above the two second limiting rods 5. The electric push rod 13 is activated, causing its telescopic end to drive the limiting frame 6 downwards until the first limiting rod 4 contacts the first indentation on the cardboard and both second limiting rods 5 contact the lower side of the cardboard. The electric push rod 13 is then deactivated. During this process, the two second limiting rods 5 slide along their corresponding guide sleeves 7 to adjust the distance between them. During transport, the two guide ramps 19 guide the cardboard to ensure it can move to the lower side of the first limiting rod 4.

[0040] Once the first limiting rod 4 and both second limiting rods 5 are in contact with the cardboard, the two pairs of hydraulic push rods 702 and electric push rods 13 are activated (the following description will use the pair of hydraulic push rods 702 on the right and their related parts as an example; in actual use, only one pair of hydraulic push rods 702 can be activated for bending). The telescopic ends of the two hydraulic push rods 702 together drive the extrusion plate 705 to rotate through the arc plate 704, bending the cardboard. During the bending process, the telescopic end of the electric push rod 13 drives the first limiting rod 4 to move downward through the limiting frame 6, and the distance between the two second limiting rods 5 gradually decreases during this process (during this process, both the first limiting rod 4 and the second limiting rod 5 slide along the two support plates 3). The first limiting rod 4 presses the indentation of the cardboard downward, and the two second limiting rods 5 respectively support and limit the lower two sides of the area to be bent, controlling the extension speed of the telescopic end of the hydraulic push rod 702 to match the change in the bending angle of the cardboard, so as to limit the speed at which the bending angle of the cardboard decreases and reduce the probability of tearing caused by the bending angle decreasing too quickly.

[0041] When the cardboard is bent to the desired angle, the two pairs of hydraulic push rods 702 and electric push rods 13 are driven in reverse to reset the extrusion plate 705 and the first limiting rod 4 and disengage them from the cardboard. The two second limiting rods 5 are reset and still support the cardboard. Then, the two conveying modules 2 are activated to transport the next crease of the cardboard to below the first limiting rod 4. The above actions are repeated until the cardboard folding operation is completed. The cardboard is then transported to the subsequent steps using the conveying module 2.

[0042] Example 2

[0043] Based on Example 1, referring to Figure 3and Figures 8-11 As shown, it also includes symmetrically distributed sliding columns 20, which are slidably connected to different arc-shaped guide frames 703. The telescopic ends of the same pair of hydraulic push rods 702 are hinged to the corresponding sliding columns 20. Sliding columns 20 are slidably connected to sliding blocks 21. Sliding columns 20 are slidably connected to corresponding arc-shaped plates 704. Arc-shaped plates 704 are slidably connected to equidistantly distributed limiting protrusions 22. An elastic element is fixed between the limiting protrusions 22 and the corresponding arc-shaped plates 704. The limiting protrusions 22 are provided with inclined surfaces. The inclined surfaces of the limiting protrusions 22 gradually move away from the corresponding sliding blocks 21 from the side away from the extrusion plate 705 to the side closer to it. The sliding blocks 21 are used to extrude the inclined surfaces of the corresponding limiting protrusions 22. The sliding columns 20 are fixedly connected to an n-shaped frame 23. The n-shaped frame 23 is threadedly connected to a second bolt 24 that is rotatably connected to the corresponding sliding block 21.

[0044] In the above scheme, the elastic element of the limiting protrusion 22 is a spring. The second bolt 24 is rotated according to the properties of the cardboard to adjust the relative position of the sliding block 21 and the sliding post 20. This adjusts the maximum force exerted by the sliding block 21 when it drives the arc plate 704 to swing using the limiting protrusion 22, ensuring that the cardboard will not tear due to the pressure of the extrusion plate 705. Furthermore, it ensures that the angle at which the extrusion plate 705 pushes the cardboard to swing corresponds to the angle change that limits the bending of the cardboard by the first limiting rod 4 and the two second limiting rods 5, thus ensuring the integrity of the cardboard. The limiting protrusion 22 is used to limit the sliding... If the limiting force of the limiting protrusion 22 on the sliding block 21 is insufficient to push the cardboard to bend, the sliding block 21 will press the inclined surface of the limiting protrusion 22 to skip the limiting protrusion 22, and the pressing plate 705 will stop pressing the cardboard under its own weight and the reaction force of the cardboard. The pressing plate 705 will push the cardboard multiple times to complete the bending, avoiding direct hard pressing that could cause the cardboard to tear, thus ensuring the integrity of the cardboard. After the cardboard bending is completed, the limiting protrusion 22 will be pushed into the arc plate 704 and the sliding column 20 will be reset.

[0045] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-hardness packaging box folding device, comprising two supports (1), each of which is equipped with a conveying module (2), characterized in that, The two brackets (1) are provided with two symmetrically distributed support plates (3). The two support plates (3) are slidably connected to a first limiting rod (4) and two symmetrically distributed second limiting rods (5). The first limiting rod (4) is located above the two second limiting rods (5). The first limiting rod (4) is slidably connected to two limiting frames (6). The limiting frames (6) are provided with two symmetrically distributed fan-shaped through holes (15). The limiting frames (6) are slidably connected to symmetrically distributed guide sleeves (7). The guide sleeves (7) are located in the corresponding fan-shaped through holes (15). The two guide sleeves (7) are respectively The second limiting rod (5) is used to guide the movement of the corresponding second limiting rod (5). A support (701) is provided between the two supports (1). The support (701) is hinged with two pairs of symmetrically distributed hydraulic push rods (702). The support (701) is fixed with symmetrically distributed arc-shaped guide frames (703). The arc-shaped guide frames (703) are provided with arc-shaped plates (704). The arc-shaped guide frames (703) are used to guide the corresponding arc-shaped plates (704). The arc-shaped plates (704) are fixed with extrusion plates (705). The same pair of hydraulic push rods (702) are used to drive the corresponding arc-shaped plates (704) to move.

2. The high-hardness packaging box folding device according to claim 1, characterized in that, The support plate (3) is slidably connected to the mounting bracket (8), the mounting bracket (8) is rotatably connected to the first screw (9), the first screw (9) is threadedly connected to the corresponding support plate (3), the first screw (9) is fixedly connected to the handle (10), the mounting bracket (8) is fixedly connected to the rectangularly distributed limiting blocks (11), the limiting blocks (11) are used to lock themselves onto the corresponding bracket (1).

3. The high-hardness packaging box folding device according to claim 1, characterized in that, The conveying module (2) has a plurality of first conveyor belts (201) and a plurality of second conveyor belts (202), which are arranged in an alternating pattern, and the lengths of the first conveyor belts (201) and the second conveyor belts (202) are different.

4. The high-hardness packaging box folding device according to claim 1, characterized in that, The limiting frame (6) is slidably connected to a guide frame (12), and the guide frame (12) is equipped with an electric push rod (13). The telescopic end of the electric push rod (13) is fixedly connected to the corresponding limiting frame (6).

5. A high-hardness packaging box folding device according to claim 4, characterized in that, The two support plates (3) are rotatably connected by symmetrically distributed second screws (14), and the guide frame (12) is threadedly connected to the symmetrically distributed second screws (14).

6. A high-hardness packaging box folding device according to claim 5, characterized in that, One of the guide sleeves (7) on the limiting frame (6) is fixedly connected to a mounting plate (16), the mounting plate (16) is threadedly connected to a first bolt (1601), the limiting frame (6) is provided with a guide groove (17), the guide groove (17) is used to limit the position of the first bolt (1601), the first bolt (1601) is used to lock the mounting plate (16) to the limiting frame (6), the guide sleeve (7) is fixedly connected to an arc-shaped rack (18), and the two arc-shaped racks (18) corresponding to the same limiting frame (6) mesh with each other.

7. A high-hardness packaging box folding device according to claim 1, characterized in that, The limiting frame (6) has a guide ramp (19) for guiding the material on the side away from the corresponding support plate (3).

8. A high-hardness packaging box folding device according to claim 1, characterized in that, It also includes symmetrically distributed sliding columns (20), which are slidably connected to different arc-shaped guide frames (703). The telescopic ends of the same pair of hydraulic push rods (702) are hinged to the corresponding sliding column (20). The sliding column (20) is slidably connected to a sliding block (21). The sliding column (20) is slidably connected to the corresponding arc-shaped plate (704). The arc-shaped plate (704) is slidably connected to equidistantly distributed limiting protrusions (22). An elastic element is fixed between the limiting protrusion (22) and the corresponding arc-shaped plate (704).

9. A high-hardness packaging box folding device according to claim 8, characterized in that, The limiting protrusion (22) is provided with an inclined surface. The inclined surface of the limiting protrusion (22) gradually moves away from the side away from the extrusion plate (705) to the side closer to the corresponding sliding block (21). The sliding block (21) is used to extrude the inclined surface corresponding to the limiting protrusion (22).

10. A high-hardness packaging box folding device according to claim 9, characterized in that, The sliding column (20) is fixedly connected to an n-shaped frame (23), and the n-shaped frame (23) is threadedly connected to a second bolt (24) that is rotatably connected to the corresponding sliding block (21).

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