Cover folding device and carton opener

Abstract

The embodiment of the present application provides a folding device, which comprises a rack, a front cover folding assembly, a side cover folding assembly and a conveying assembly. The front cover folding assembly comprises a front cover folding plate. The side cover folding assembly comprises a pair of guide rods, which comprise a first end, a second end extending obliquely downward and a contact surface. The front cover folding plate is further provided with a first guide plate. The rack is further provided with a second guide plate. The side cover in a folded state is located between the first guide plate and the second guide plate. The conveying assembly comprises a pair of conveying belts, which clamp and convey cartons. The conveying belts have the following effects. On the one hand, the up-and-down position of the side cover during movement is always kept flat. On the other hand, due to the scraping effect of the first guide plate and the second guide plate, paper scraps and strips fall off. On the third hand, the side cover is folded and the carton is conveyed at the same time, so that the process of folding the side cover alone is reduced, the production efficiency is improved, and in addition, the side cover is subjected to uniform stress during folding, and damage is reduced.

Description

Folding device and box opener Technical Field

[0001] This invention relates to a lid-folding device and a box opener using the lid-folding device. Background Technology

[0002] Automatic carton erectors are increasingly widely used in various automated production line systems. A typical automatic carton erector needs to complete steps such as unfolding the carton, folding the front, back, and left / right side flaps, securing them with tape, and conveying the carton downstream. To accomplish these actions, the main structure of existing automatic carton erectors, as disclosed in document CN207631619U entitled "An Automatic Carton Erection Machine," includes a carton suction and picking assembly, a front flap folding assembly, a back flap folding assembly, a side flap folding assembly, and a belt conveyor assembly for conveying the carton out of the erector. The side flap folding assembly uses a pair of cylinder-driven swing arms that move relative to each other to push and fold the side flaps. After the side flaps are folded, the belt conveyor assembly transfers the carton out of the erector. This traditional structure has the following problems:

[0003] 1. As production line speeds increase, the requirements for carton opening and forming speeds also increase. In this way, each flap folding action performed by the carton opening machine requires sufficient time. If the action is too fast, it will damage the carton flaps, thus making it impossible to further increase the carton opening and forming speed and meet the requirements.

[0004] Second, since the cardboard boxes are formed by cutting, there are sometimes paper scraps on the edge of the box lid. In this traditional box forming process, paper scraps or residual paper strips are easy to get stuck in the seams of the formed cardboard boxes, which may cause trouble for subsequent packing. Summary of the Invention

[0005] Therefore, the present invention provides a folding cover device to solve the above-mentioned technical problems.

[0006] A folding device is used to fold the front cover and side cover of a carton, wherein the front cover and side cover are in an upright state and a folded state. The folding device includes a frame and a front cover folding assembly, a side cover folding assembly, and a conveying assembly mounted on the frame. The device is characterized in that...

[0007] The frame includes side plates and upper and lower plates located at both ends of the side plates and extending toward the back;

[0008] The folding front cover assembly includes a front cover folding plate, which is configured to move movably in a first direction and to bend the front cover from an upright state to a folded state during the movement in the first direction.

[0009] The folding side cover assembly includes a pair of guide rods disposed on both sides of the front cover folding plate. Each guide rod includes a head end connected to the frame, an end end extending obliquely downward from the head end, and an abutting surface located between the head end and the end end. When the side cover moves along the abutting surface, the side cover bends from an upright state to a folded state. Furthermore, the front cover folding plate is also provided with a first guide plate, and the frame is also provided with a second guide plate. The first guide plate includes a first guide surface, and the second guide plate includes a second guide surface. The folded side cover is located between the first guide surface and the second guide surface.

[0010] The conveying assembly includes a pair of conveyor belts located on both sides of the frame, the pair of conveyor belts being configured to clamp and convey cartons.

[0011] The first guide plate is perpendicular to the front cover fold plate, and the first guide plate and the front cover fold plate are T-shaped. The second guide surface is an arc surface and extends from the side plate towards the front cover fold plate.

[0012] The front cover fold includes a rear edge that extends above the second guide surface, and the area corresponding to the rear edge is not provided with a first guide plate. A rear notch is provided below the rear edge, and the second guide plate extends into the rear notch.

[0013] The guide rod is in a bent state and includes a first section and a second section. The first section includes a first axis, and the second section includes a second axis. The first axis and the second axis have an included angle of 5°-15°.

[0014] The side plate is also provided with a rotating cylinder, and the guide rod is also provided with a connecting section. The connecting section includes a third axis. The connecting section is inserted into the rotating cylinder and is configured to rotate around the third axis.

[0015] The pair of guide rods includes a first guide rod and a second guide rod, and the pair of conveyor belts includes a left conveyor belt and a right conveyor belt. The positions of the left and right conveyor belts are adjustable, and when the positions of the left and right conveyor belts are adjusted, the first guide rod is linked with the left conveyor belt, and the second guide rod is linked with the right conveyor belt.

[0016] The first guide rod is also provided with a linkage plate, which includes an adjustment groove. The left conveyor belt includes an adjustment rod, which is inserted vertically into the adjustment groove.

[0017] The second guide plate includes a groove, and the rotating cylinder corresponds to the groove. When the connecting section is inserted into the rotating cylinder, the first guide rod is located above the second guide plate, and the first guide rod is separated from the second guide plate. The second guide plate also includes an extension extending outward from the middle, and the projections of the first guide rod and the extension on the horizontal plane intersect.

[0018] When the front cover fold is at its minimum position relative to the side plate, the projections of the first guide plate and the second guide plate on the horizontal plane have an overlapping area.

[0019] The present invention also provides a case opener, including the above-mentioned case folding device.

[0020] Beneficial Effects: This invention provides a folding cover device, including a frame, a front cover folding assembly, a side cover folding assembly, and a conveying assembly. The front cover folding assembly includes a front cover folding plate. The side cover folding assembly includes a pair of guide rods, each guide rod having a head end, a downwardly extending end, and a contact surface. When the side cover moves, it bends from an upright state to a folded state. A first guide plate is also provided on the front cover folding plate, and a second guide plate is also provided on the frame. The first guide plate includes a first guide surface, and the second guide plate includes a second guide surface. The folded side cover is located between the first guide surface and the second guide surface. The conveying assembly includes a pair of guide rods. The conveyor belt system, consisting of a pair of conveyor belts clamping and transporting the carton, offers several advantages. Firstly, it ensures the side cover remains level throughout its movement. Secondly, the scraping action of the first and second guide plates causes paper scraps and strips to fall off. Thirdly, the carton is conveyed out simultaneously with the side cover bending, reducing the need for a separate side cover bending process and improving production efficiency. Furthermore, the use of guide rods for bending, along with the constraint of the first and second guide plates, ensures the side cover experiences uniform force during bending, preventing the impact from the swing arm seen in existing technologies. Attached Figure Description

[0021] Figure 1. Schematic diagram of the cardboard box;

[0022] Figure 2. Schematic diagram of the folding cover device according to an embodiment of the present invention;

[0023] Figure 3 is the left view of Figure 1;

[0024] Figure 4 is a top view of Figure 1;

[0025] Figure 5 is an enlarged schematic diagram of area B in Figure 4;

[0026] Figure 6 is a schematic diagram of the AA cross-sectional structure in Figure 3;

[0027] Figure 7 is an enlarged schematic diagram of region C in Figure 6;

[0028] Figure 8 is a schematic diagram of the first guide rod structure;

[0029] Figure 9 is a top view of Figure 8;

[0030] Component descriptions in the diagram:

[0031] Frame 20; Upper plate 21; Side plate 22; Lower plate 23; Receiving cavity 24; Rotary drum 25; Front cover assembly 30; Front cover folding plate 31; Pushing part 311; Cavity part 3110; Rear edge part 312; Rear notch part 313; Actuating device 32; Lower mounting plate 33; Protective plate 34; First guide rod 41; Head end 4101; Tail end 4102; First section 411; First axis 4110; Second section 412; Second axis 4120; Connecting section 413 Third axis 4130; First guide plate 42; First guide surface 420; First front end 421; First rear end 422; Second guide plate 43; Second guide surface 430; Groove portion 431; Extension portion 432; Second front end 433; Second guide rod 44; Conveying assembly 50; Left conveyor belt 51; Left nut 511; Right conveyor belt 52; Right nut 521; Lead screw 53; Handwheel 54; Linking plate 61; Adjusting groove 611; Adjusting rod 62. Detailed Implementation

[0032] This invention provides a folding device for bending the front and side covers of a carton. The side covers include a left cover and a right cover. Referring to Figure 1, the carton, when unfolded, forms a cylindrical shape, including a carton body, an upper cover portion located at the top of the carton body, and a lower cover portion located at the bottom of the carton body. The lower cover portion includes a front cover, a left cover, a right cover, and a rear cover. The carton opener needs to bend the front cover, rear cover, left cover, and right cover to form a container with an open top and a closed bottom for holding products. The folding device of this embodiment is used to bend the front cover, left cover, and right cover. It is understood that the carton opener using the folding device of this invention may also include a device for bending the rear cover to form a container. In addition, the left cover and right cover should overlap the front cover and rear cover, so that the container can be fixed by overlapping or covering the left cover and right cover with adhesive tape or other connecting devices.

[0033] Understandably, the front cover, back cover, left cover, and right cover are upright before being bent. After being bent, the front cover, back cover, left cover, and right cover are bent at 90° and are in a folded state.

[0034] To facilitate the bending of the front cover, rear cover, left cover, and right cover, creases are provided between the front cover, rear cover, left cover, and right cover and the box body. These creases are usually pre-made indentations or grooves.

[0035] Please refer to Figures 2-9. The folding cover device of the present invention includes a frame 20 and a front folding cover assembly 30, a side folding cover assembly and a conveying assembly 50 disposed on the frame 20.

[0036] The frame 20 includes a side plate 22 and an upper plate 21 and a lower plate 23 located at the upper and lower ends of the side plate 22. The upper plate 21 and the lower plate 23 extend toward the back. Specifically, in this embodiment, one end of the upper plate 21 is connected to the upper end of the side plate 22, and the other end extends from left to right. One end of the lower plate 23 is connected to the lower end of the side plate 22, and the other end extends from right to left. At the same time, the lower plate 23 includes a mounting surface perpendicular to the side plate 22.

[0037] Furthermore, the frame 20 is provided with a receiving cavity 24 in the area adjacent to the upper plate 21 for setting up a tape distribution device. The tape distribution device is used to attach tape to the carton passing through the upper plate 21 to fix the left and right covers.

[0038] The folding cover assembly 30 includes a front cover folding plate 31, which is configured to move movably along a first direction and to bend the front cover from an upright state to a folded state during the movement along the first direction.

[0039] Understandably, the first direction is perpendicular to the side panel 22 and in a direction away from the side panel 22. In this embodiment, the first direction is horizontal to the left. The front cover assembly 30 is disposed on the mounting surface. The front cover folding plate 31 is a flat plate perpendicular to the mounting surface. In its direction away from the side panel 22, it includes a pushing part 311 for abutting the front cover. When the front cover folding plate 31 moves along the first direction, the pushing part 311 pushes the front cover to move, causing the front cover to bend and attach to the box body.

[0040] Understandably, the folding front cover assembly 30 also includes an actuating device 32 for driving the front cover folding plate 31 to move. In this embodiment, the actuating device 32 is a cylinder.

[0041] Furthermore, the pushing part 311 is arc-shaped to prevent damage to the surface of the front cover when it pushes against the bending of the front cover.

[0042] Understandably, one end of the actuating device 32 is fixed to the side plate 22, and the other end is fixed to the front cover folding plate 31, thereby driving the front cover folding plate 31 to move in the first direction. In this embodiment, a cavity 3110 is also provided on the lower side of the front cover folding plate 31, and the actuating device 32 is housed in the cavity 3110. At the same time, a protective plate 34 is also provided at the front end of the front cover folding plate 31. The width of the protective plate 34 is greater than or equal to the maximum width of the actuating device 32, so that the protective plate 34 forms a shield at the front end of the front cover folding plate 31 to prevent the protruding parts on both sides of the actuating device 32 from causing unexpected damage to the carton.

[0043] Furthermore, the protective plate 34 includes an arch, which creates a shock-absorbing effect.

[0044] Furthermore, the folding front cover assembly 30 also includes a lower mounting plate 33, and the front cover folding plate 31 is disposed on the lower mounting plate 33. A guide device is also disposed between the lower mounting plate 33 and the lower plate 23 so that the front cover folding plate 31 moves stably along the first direction under the drive of the actuating device 32. In this embodiment, the guide device is a guide rail disposed on the lower plate 23 and a slider disposed on the lower mounting plate 33 that matches the guide rail.

[0045] The folding side cover assembly includes guide rods disposed on both sides of the front cover folding plate 31. The guide rods include a first end 4101 connected to the frame 20, a tail end 4102 extending obliquely downward from the first end 4101, and an abutting surface located between the first end 4101 and the tail end 4102. When the side cover moves along the abutting surface, the side cover bends from an upright state to a folded state.

[0046] Specifically, the guide rods include a first guide rod 41 for bending the left cover and a second guide rod 44 for bending the right cover. The first guide rod 41 and the second guide rod 44 are symmetrically arranged along the central axis of the side plate 22. In the following description, only the first guide rod 41 will be described, and the second guide rod 44 will not be described again.

[0047] The first guide rod 41 has its head end 4101 adjacent to the side plate 22, and the height of the head end 4101 in the vertical direction is basically the same as the height of the upper side of the upper plate 21. The first guide rod 41 extends diagonally downward to the left. It can be understood that the second guide rod 44 extends diagonally downward to the right. The first guide rod 41 and the second guide rod 44 form an "eight" shape. When the carton moves in the second direction opposite to the first direction, the outer side of the upright left cover 12 is subjected to the squeezing force of the contact surface of the first guide rod 41 and gradually bends along the extension direction of the first guide rod 41. When it moves to the vicinity of the head end 4101 of the first guide rod 41, it bends 90° and forms a folded state. Similarly, the right cover 13 is subjected to the squeezing force of the second guide rod 44 and bends 90° to form a folded state.

[0048] In this embodiment, a first guide plate 42 is also provided on the front cover fold 31, and a second guide plate 43 is also provided on the upper plate 21 in a first direction. The first guide plate 42 is perpendicular to the front cover fold 31, so that the first guide plate 42 and the front cover fold 31 form a T-shape. The second guide plate 43 extends toward the front cover fold 31. The first guide plate 42 includes a lower first guide surface 420, and the second guide plate 43 includes an upper second guide surface 430. It is understood that the first guide surface 420 and the second guide surface 430 are arranged opposite to each other. The first guide surface 420 includes a first front end portion 421 in the direction of the contact portion and a first rear end portion 422 opposite to the direction of the contact portion. The second guide surface 430 includes a second front end portion 433 facing the first front end portion 421. It is understood that the second front end portion 433 and the first rear end portion 422 are arranged opposite to each other, and the second front end portion 433 and the first rear end portion 422 are spaced apart.

[0049] In this embodiment, when the left cover is bent into a folded shape by the guidance of the first guide rod 41, the upper surface of the left cover 12 will adhere to the first guide surface 420 of the first guide plate 42. When the carton moves in the second direction toward the upper plate 21, the lower surface of the left cover 12, which is opposite to the upper surface, will be guided to the upper plate 21 by the second guide surface 430 of the second guide plate 43. That is, the left cover 12 will be confined between the first guide surface 420 and the second guide surface 430. In this case, the following effects are achieved: Firstly, due to the confinement of the first guide surface 420 and the second guide surface 430, the upper and lower positions of the left cover remain flat during the movement, which ensures stability during the subsequent tape application process and prevents the tape from becoming concave during the application process. Secondly, if there are paper scraps or strips at or near the end of the cover, the end of the left cover will abut against or at least be adjacent to the cover after bending. The front cover folding plate 31, along with the scraping action of the first guide plate 42 and the second guide plate 43, causes paper scraps and strips to fall off, thus avoiding the paper scrap or strip problem existing in the prior art. Thirdly, as the carton moves along the second direction, the left cover is bent by the squeezing force of the first guide rod 41, and its movement direction is consistent with the direction of the carton being conveyed out of the carton opening machine. That is, the carton is conveyed out at the same time as the left cover is bent, thereby reducing the separate bending process of the side cover and improving production efficiency. In actual tests, the speed of the carton opening machine using the folding device of the present invention is 30% higher than that of the existing carton opening machine, and its maximum opening efficiency can reach more than 180 boxes / minute. In addition, due to the use of guide rods for bending, and the limitation of the first guide plate 42 and the second guide plate 43, the side cover is subjected to uniform force during bending, and the phenomenon of being hit by the swing arm in the prior art will not occur, thus reducing the carton damage rate by more than 8%.

[0050] Furthermore, in order to ensure that the left side cover can be smoothly guided by the second guide surface 430 and that the entire carton enters the area where the tape is applied, the second guide surface 430 is an arc surface.

[0051] Furthermore, the front cover folding plate 31 also includes a rear edge portion 312 in the direction of the side plate 22. The rear edge portion 312 extends above the second guide surface 430, and the area corresponding to the rear edge portion 312 is not provided with the first guide plate 42. It can be understood that after bending, there is a slit between the left and right covers, and the front cover folding plate 31 is located in the slit. During the movement of the carton, the rear edge portion 312 and the slit limit the movement of the carton in a predetermined direction, that is, the rear edge portion 312 stabilizes the movement direction of the carton.

[0052] In this embodiment, a rear notch 313 is provided below the rear edge portion 312, and the second guide plate 43 extends into the rear notch 313.

[0053] Understandably, the first guide plate 42 and the second guide plate 43 form a funnel shape to facilitate the entry and exit of the left cover. If the distance between the first rear end 422 and the second front end 433 is defined as D1, then D1≥0, that is, when the front cover folding plate 31 is at the minimum position with the side plate 22, the projections of the first guide plate 42 and the second guide plate 43 on the horizontal plane should have an overlapping area.

[0054] If we define the distance between the first guide surface 420 and the second front end 433 as D2, and the thickness of the left cover as d, then D2≥5d, which means it should be greater than or equal to 5 times the thickness of the carton material.

[0055] If we define the distance between the end of the rear edge 312 facing the side plate 22 and the first rear end 422 as D3, then D3 ≥ 5cm, so that the rear edge 312 has sufficient guiding distance.

[0056] Furthermore, please refer to Figures 8 and 9. In this embodiment, the first guide rod 41 is in a bent state, including a first segment 411 and a second segment 412. The first segment 411 includes a first axis 4110, and the second segment 412 includes a second axis 4120. There is an angle of 5°-15° between the first axis 4110 and the second axis 4120. The second segment 412 is in an open state relative to the first segment 411. The second segment 412 is a segment adjacent to the tail end 4102, and the first segment 411 is a segment adjacent to the head end 4101. In this case, on the one hand, the left cover is first subjected to a relatively gentle squeezing force during the bending process, so that the left cover can be slightly bent first, and then bent into place. On the other hand, this setting can make the guide rod have a larger opening angle to adapt to the needs of cartons of different specifications or sizes.

[0057] The conveying assembly 50 includes a pair of conveyor belts located on both sides of the frame 20, the pair of conveyor belts being configured to clamp and convey cartons.

[0058] In this embodiment, the pair of conveyor belts includes a left conveyor belt 51 and a right conveyor belt 52, and the position between the left conveyor belt 51 and the right conveyor belt 52 is adjustable to adapt to the conveying needs of different cartons. Specifically, the conveying assembly 50 also includes a position adjustment device for adjusting the position between the left conveyor belt 51 and the right conveyor belt 52. The position adjustment device includes a lead screw 53 located below the left conveyor belt 51 and the right conveyor belt 52, a left nut 511 connected to the left conveyor belt 51 and matched with the lead screw 53, and a right nut 521 connected to the right conveyor belt 52 and matched with the lead screw 53. When the lead screw 53 is rotated, the left nut 511 and the right nut 521 move, thereby causing the position of the left conveyor belt 51 and the right conveyor belt 52 to change. It can be understood that the spiral directions of the left nut 511 and the right nut 521 are opposite, so that the movement directions of the left nut 511 and the right nut 521 are opposite when the lead screw 53 rotates.

[0059] Furthermore, a handwheel 54 is also provided on the lead screw 53.

[0060] Furthermore, when adjusting the positions of the left conveyor belt 51 and the right conveyor belt 52, the first guide rod 41 is linked with the left conveyor belt 51, and the second guide rod 44 is linked with the right conveyor belt 52. That is, when the position of the left conveyor belt 51 changes, the opening angle of the first guide rod 41 changes accordingly. Similarly, when the position of the right conveyor belt 52 changes, the opening angle of the second guide rod 44 changes accordingly.

[0061] In this embodiment, the first guide rod 41 and the second guide rod 44 are pivotally connected to the side plate 22 and can each rotate along an axis parallel to the side plate 22.

[0062] Specifically, a rotating cylinder 25 is also provided on the side plate 22, and a connecting section 413 is also provided on the first guide rod 41. The connecting section 413 includes a third axis 4130. The connecting section 413 is inserted into the rotating cylinder 25 and is configured to rotate around the third axis 4130.

[0063] The first guide rod 41 is also provided with a connecting plate 61, which includes an adjustment groove 611. The left conveyor belt 51 includes an adjustment rod 62, which is vertically inserted into the adjustment groove 611. When the position of the left conveyor belt 51 changes, the adjustment rod 62 drives the adjustment groove 611 and the connecting plate 61 to move, thereby causing the first guide rod 41 to rotate around the third axis 4130.

[0064] In this embodiment, the first axis 4110, the second axis 4120 and the third axis 4130 are coplanar, and the first segment 411, the second segment 412 and the third segment are integrally formed.

[0065] Furthermore, the connecting segment 413 is located at the first end 4101, and there is an arc transition segment between the connecting segment 413 and the first segment 411, and the first segment 411 and the second segment 412 are connected by another arc transition segment.

[0066] Furthermore, the second guide plate 43 includes a groove 431, and the rotating cylinder 25 corresponds to the groove 431. When the connecting section 413 is inserted into the rotating cylinder 25, the first guide rod 41 is located above the second guide plate 43, and the first guide rod 41 is separated from the second guide plate 43, that is, to prevent the first guide rod 41 and the second guide plate 43 from clamping the left cover. The second guide plate 43 also includes an extension 432 extending outward from the middle. The projections of the first guide rod 41 and the extension 432 on the horizontal plane intersect, so that the second guide plate 43 has sufficient area to guide the movement of the left cover.

[0067] The present invention also provides a case opener, which includes the above-mentioned case folding device.

[0068] Furthermore, the carton opener also includes a carton suction assembly, a rear cover folding assembly (not shown), and a carton pusher assembly (not shown). The carton suction assembly is used to unfold the carton, the carton pusher assembly is used to make the carton with the front cover, rear cover, left cover, and right cover in a folded state move along the second direction and enter the conveying assembly 50, thereby being conveyed downstream by the conveying assembly 50, and the rear cover folding assembly is used to bend the rear cover.

[0069] To facilitate understanding, a method for opening and forming boxes using a box-opening machine is provided to further illustrate the present invention:

[0070] S1: Provide a case opener, which includes a case suction assembly, a case folding assembly, a case pushing assembly, and a case folding device;

[0071] S2: The suction box assembly unfolds the cardboard box, which includes a box body and a front cover, a rear cover, a left cover, and a right cover, wherein the front cover, the rear cover, the left cover, and the right cover are all in an upright state;

[0072] S3: The back cover assembly bends the back cover, causing the back cover to bend from an upright state to a folded state. The front cover folding plate 31 of the folding device moves along the first direction to push the front cover to bend, causing the front cover to bend from an upright state to a folded state.

[0073] S4: The push box assembly pushes the box body to move in the second direction. During the movement of the box body, the side cover moves along the contact surface under the limitation of the guide rod, causing the side cover to bend from the upright state to the folded state.

[0074] Understandably, after the side cover is bent at 90°, its upper surface is in contact with the first guide surface of the first guide plate 42. At the same time, during the movement of the box, the lower surface of the side cover is limited by the second guide plate 43 and moves to the conveying assembly while being clamped by the first guide plate and the second guide plate.

[0075] S5: The conveying component clamps the box and conveys the box to the downstream direction.

[0076] Understandably, in the above process, the bending of the side cover and the conveying process of the box are a continuous process, without the need for a stop time or a separate side cover bending process. At the same time, the bending process of the side cover is also a gradual process, not a striking or pushing process as in the prior art, which increases the speed while reducing the damage rate.

[0077] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A folding device for bending the front cover and side cover of a carton, wherein the front cover and side cover are in an upright state and a folded state, the folding device comprising a frame and a front cover folding assembly, a side cover folding assembly, and a conveying assembly mounted on the frame, characterized in that, The frame includes side plates and upper and lower plates located at both ends of the side plates and extending in opposite directions; the folding front cover assembly includes a front cover folding plate, which is configured to move movably along a first direction and bend the front cover from an upright state to a folded state during the movement along the first direction; the folding side cover assembly includes a pair of guide rods disposed on both sides of the front cover folding plate, each guide rod including a head end connected to the frame, an end end extending obliquely downward from the head end, and an abutting surface located between the head end and the end end, wherein the side cover bends from an upright state to a folded state when moving along the abutting surface, and the front cover folding plate is also provided with a first guide plate, and the frame is also provided with a second guide plate, wherein the first guide plate includes a first guide surface, the second guide plate includes a second guide surface, and the folded side cover is located between the first guide surface and the second guide surface; the conveying assembly includes a pair of conveyor belts located on both sides of the frame, and the pair of conveyor belts are configured to... The system is configured to clamp and transport cartons; a first guide plate is perpendicular to the front cover folding plate, forming a T-shape with the front cover folding plate; a second guide surface is an arc surface, extending from the side plate towards the front cover folding plate; the front cover folding plate includes a rear edge extending above the second guide surface, and the area corresponding to the rear edge does not have a first guide plate; a rear notch is provided below the rear edge, and the second guide plate extends into the rear notch; a pair of guide rods includes a first guide rod and a second guide rod; a pair of conveyor belts includes a left conveyor belt and a right conveyor belt, and the positions of the left and right conveyor belts are adjustable; when the positions of the left and right conveyor belts are adjusted, the first guide rod is linked with the left conveyor belt, and the second guide rod is linked with the right conveyor belt; a linkage plate is also provided on the first guide rod, the linkage plate including an adjustment groove; the left conveyor belt includes an adjustment rod, which is vertically inserted into the adjustment groove.

2. The folding cap device as described in claim 1, characterized in that, The guide rod is in a bent state and includes a first section and a second section. The first section includes a first axis, and the second section includes a second axis. There is an angle of 5°-15° between the first axis and the second axis.

3. The folding cap device as described in claim 2, characterized in that, The side plate is also provided with a rotating cylinder, and the guide rod is also provided with a connecting section. The connecting section includes a third axis. The connecting section is inserted into the rotating cylinder and is configured to rotate around the third axis.

4. The folding cap device as described in claim 3, characterized in that, The second guide plate includes a groove, and the rotating cylinder corresponds to the groove. When the connecting section is inserted into the rotating cylinder, the first guide rod is located above the second guide plate, and the first guide rod is separated from the second guide plate. The second guide plate also includes an extension extending outward from the middle, and the projections of the first guide rod and the extension on the horizontal plane intersect.

5. The folding cap device as described in claim 4, characterized in that, When the front cover fold is at its minimum position relative to the side plate, the projections of the first guide plate and the second guide plate on the horizontal plane have an overlapping area.

6. A box-opening machine, characterized in that, Includes the folding cover device as described in any one of claims 1-5.

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