Unstacking device and system for cartons

Abstract

The unstacking device comprises a grabbing plate assembly, the grabbing plate assembly comprises a grabbing plate with the plate face vertically extending, the grabbing plate is provided with a friction face with the rough surface, the friction face makes extrusion contact with the side face of a carton stack, the grabbing plate can vertically ascend and descend, and when the grabbing plate ascends, the grabbing plate upwards grabs the carton acting on the friction face through friction force; the pressing plate assembly comprises a pressing plate with the plate face extending transversely, and the pressing plate is arranged on the front side of the friction face of the grabbing plate in a lifting mode. The inserting plate assembly comprises an inserting plate with the plate face extending transversely, the inserting plate can be transversely and movably arranged below the grabbing plate, and the transverse movement range of the inserting plate is from being completely located on the rear side of the friction face to being at least partially located on the front side of the friction face. According to the carton clamping device, tightly stacked cartons can be separated through the grabbing plate, the inserting plate can be smoothly inserted into the position below the target carton, and through the vertical clamping effect of the pressing plate and the inserting plate, high-adaptability clamping can be achieved regardless of the specifications of the cartons.

Description

Technical Field

[0001] The invention relates to a depalletizing device and system for cardboard boxes. Background Art

[0002] Usually, cartons are stored and transported in the form of stacks, each stack consists of two rows of flat, unopened cartons stacked on a pallet, creating an efficient and space-efficient storage model. However, on traditional production lines, the destacking of cardboard box stacks relies on manual destacking into groups of 60 to 80 sheets for feeding to the paper packaging machine. In this mode, the labor intensity is high and the working hours are long, which becomes a bottleneck for improving production efficiency.

[0003] The core challenge of mechanized depalletizing of cardboard boxes lies in the narrow gaps between stacked cardboard boxes and the variability of cardboard boxes. In the exploration of mechanized depalletizing, there is a lack of suitable equipment to effectively separate these tightly stacked cardboard boxes. In addition, the sizes and shapes of cardboard boxes vary greatly, which makes traditional depalletizing and stacking machines unable to adapt to the numerous and frequently added cardboard boxes, further increasing the difficulty of mechanization. Summary of the invention

[0004] The technical problem to be solved by the present invention is to propose a destacking device and system for cardboard boxes, which can separate tightly stacked cardboard boxes and has strong adaptability to cardboard boxes of different specifications, in view of the above technical status.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a depalletizing device for cardboard boxes, which includes a device frame, characterized in that it includes

[0006] The grab plate assembly includes a grab plate extending vertically from the board surface, the grab plate having a rough friction surface, the friction surface being in compression contact with the side surface of the cardboard box stack, the grab plate being able to rise and fall vertically, and when the grab plate rises, it grabs the cardboard box acting on the friction surface upwards by friction force;

[0007] A pressure plate assembly, comprising a pressure plate with a plate surface extending transversely, and the pressure plate is arranged on the side of the friction surface of the gripping plate in a manner that it can be raised and lowered;

[0008] The plug plate assembly comprises a plug plate with a transversely extending plate surface. The plug plate is laterally movable and arranged below the grab plate. The transverse movement range of the plug plate is from being completely located behind the friction surface to being at least partially located in front of the friction surface.

[0009] At the end of destacking the cardboard box stacks, some thin cardboard boxes may be left that cannot be picked up by the gripping plate. In order to deal with this situation, preferably, the destacking device also includes a suction cup assembly, the suction cup assembly includes a suction cup and a suction cup mounting plate for mounting the suction cup, the plate surface of the suction cup mounting plate extends laterally and is vertically liftable and disposed on the front side of the friction surface.

[0010] Furthermore, the middle part of the pressure plate has a hollow portion, and the suction cup mounting plate can pass through the hollow portion when it is lifted or lowered.

[0011] After the cardboard box stack is depalletized, in order to facilitate the handling of the stacking plates left on the workstation, preferably, the depalletizing device also includes a fork stacking plate assembly, including a fork stacking plate swing rod and a fork stacking plate swing arm, the fork stacking plate swing arm is swingably connected to a fork stacking plate swing shaft perpendicular to the friction surface, one end of the fork stacking plate swing arm is fixedly connected to the fork stacking plate swing rod so that the two are L-shaped, and the fork stacking plate swing rod can swing between the side of the cardboard box stack and the bottom of the stacking plate under the drive of the fork stacking plate swing arm.

[0012] Specifically, the fork stacking plate assembly includes two symmetrically arranged fork stacking plate swing arms, each of which is fixedly connected to a fork stacking plate swing rod, and a slide groove extending along the length direction is opened at one end of the fork stacking plate swing arm away from the fork stacking plate swing rod. The fork stacking plate assembly also includes a lifting rod and a fork stacking plate cylinder. The lifting rod passes through the slide groove to string the two swing arms together, and the piston of the fork stacking plate cylinder drives the lifting rod to lift vertically.

[0013] Specifically, the device frame also includes a main frame in the shape of a rectangular parallelepiped, and the other structures of the depalletizing device are directly or indirectly arranged on the main frame. The grab plate is installed on the front side of the main frame, the rocker arm is installed on the rear side of the main frame, and the plug plate is installed on the lower side of the main frame. The top surface of the main frame is provided with an interface flange for connecting with other components of the depalletizing system.

[0014] Furthermore, a vertically extending grab plate guide rail is provided on the front side of the main frame, a grab plate slider is fixed on the rear side of the grab plate, and the grab plate slider is arranged on the grab plate slide rail. The grab plate assembly also includes a grab plate cylinder, which is inside the main frame and fixedly connected to the top surface of the main frame. A piston connector is provided at one end of the piston of the grab plate cylinder, and the other end of the piston connector is connected to the rear side of the grab plate. The piston of the grab plate cylinder moves vertically and drives the grab plate to move synchronously.

[0015] Furthermore, a vertically extending pressure plate guide rail is provided on the side of the main frame, the pressure plate is fixed to the pressure plate slider, the pressure plate slider is arranged on the pressure plate guide rail, the pressure plate assembly also includes a pressure plate cylinder, a pressure plate pull rod and two pressure plate rocker arms, the pressure plate cylinder is inside the main frame and is rotatably connected to the top surface of the main frame, the piston of the pressure plate cylinder is connected to the middle part of the pressure plate pull rod, the two ends of the pressure plate pull rod are respectively connected to the middle parts of the two pressure plate rocker arms, one end of the pressure plate rocker arm is connected to the pressure plate slider, and the other end is rotatably connected to the side of the main frame.

[0016] Furthermore, a laterally extending plug-in plate guide rail is provided on the side of the main frame, the plug-in plate is fixed to a plug-in plate slider, the plug-in plate slider is arranged on the plug-in plate guide rail, the plug-in plate assembly also includes a first plug-in plate cylinder and a second plug-in plate cylinder in the main frame, the first plug-in plate cylinder is fixed to the rear side of the main frame and its piston faces the front side of the main frame, the second plug-in plate cylinder is fixed to the upper surface of the plug-in plate and its piston faces the rear side of the main frame, and the piston connecting piece connects the piston of the first plug-in plate cylinder with the piston of the second plug-in plate cylinder.

[0017] The present invention also proposes a technical solution: a depalletizing system for cartons, characterized in that the depalletizing device described above is applied.

[0018] Compared with the prior art, the destacking device of the present invention is provided with a grab plate. When the grab plate rises, it grabs the cardboard box in contact with the friction surface through friction, effectively creating a gap between this part of the cardboard box and the other stacked cardboard boxes. Then the insert plate is inserted horizontally under the grabbed cardboard box, and then the pressure plate is lowered and pressed to form a stable clamp with the insert plate, ensuring that this part of the cardboard box is firmly fixed. Subsequently, the destacking device of the present invention is controlled to move, and the separated cardboard box can be clamped to the desired position. The present invention can separate tightly stacked cardboard boxes through the grab plate, so that the insert plate can be smoothly inserted under the target cardboard box, and the present invention replaces the traditional two-side clamping method through the upper and lower clamping action of the pressure plate and the insert plate, which means that regardless of the specifications of the cardboard box, the present invention can achieve highly adaptable clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a depalletizing system according to an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of a destacking device according to an embodiment of the present invention from a front view;

[0021] Figure 3 A schematic diagram of a destacking device according to an embodiment of the present invention from a bottom-up perspective;

[0022] Figure 4 A schematic diagram of a depalletizing device according to an embodiment of the present invention from a rear view angle;

[0023] Figure 5 Schematic diagram of a depalletizing device according to an embodiment of the present invention from a top view (part of the top structure and side structure of the depalletizing device are hidden);

[0024] Figure 6 A schematic diagram of a depalletizing device according to an embodiment of the present invention when grabbing stacked cartons;

[0025] Figure 7 A schematic diagram of a depalletizing device according to an embodiment of the present invention when clamping stacked cardboard boxes;

[0026] Figure 8 It is a schematic diagram of the depalletizing device according to the embodiment of the present invention when sucking up a single-layer cardboard box;

[0027] Fig. 9 A schematic diagram of a destacking device according to an embodiment of the present invention when clamping a stacking plate;

[0028] Fig.10 It is a schematic structural diagram of the destacking device according to an embodiment of the present invention after the stacking plates are released;

[0029] Fig.11 Schematic diagram of a depalletizing device and a truss robot of a depalletizing system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to the accompanying drawings.

[0031] like Figures 1 to 10 As shown in FIG. 1 , an embodiment of a depalletizing system for cardboard boxes of the present invention is shown. This embodiment includes key components such as a precision depalletizing device 1, an automatic guided vehicle 2 (AGV), a cardboard box conveyor belt 4, and a truss robot 6. The truss robot 6, as shown in FIG. Fig.11 As shown, its main body is constructed by a stable column 61 and a crossbeam 62, and is usually equipped with multiple precision travel shafts 63. These shafts are driven by a motor and convert the rotational power into smooth linear motion through transmission devices such as gears, racks or transmission belts. The depalletizing device 1 works in coordination with the truss robot 6, and the truss robot 6 controls the depalletizing device 1 to move freely in the workspace, so as to achieve accurate grasping, smooth handling and flexible flipping of cardboard boxes.

[0032] The workflow of the entire depalletizing system is as follows: First, the cardboard box stack 3 is placed on the automatic guided vehicle 2 by a forklift, and the automatic guided vehicle 2 transports it to the unpacking machine to cut the cable ties and remove the top plate. Then, the automatic guided vehicle 2 transports the processed cardboard box stack 3 to the depalletizing station. After the cardboard box stack 3 is aligned in a row, the truss robot 6 drives the depalletizing device 1 to move precisely, grabs the stacked cardboard boxes 31 according to the set thickness, places them on the cardboard box conveyor belt 4 and transports them to the carton machine. After depalletizing is completed, the depalletizing device 1 grabs the empty stack board 32 and transfers it to the stack board collection area. When the stack boards 32 are stacked to a preset height, the automatic guided vehicle 2 receives a signal and transports these stack boards 32 away. This constitutes a complete operation cycle, realizing the full automation of the depalletizing process of the cardboard box stack.

[0033] The depalletizing device 1 is the most critical structure in the depalletizing system. The depalletizing device 1 of this embodiment mainly includes a grab plate assembly 11, a pressure plate assembly 12, an insert plate assembly 14, a suction cup assembly 13, a fork pallet assembly 15, etc. These components are directly or indirectly arranged on the main frame 17 of the depalletizing device 1.

[0034] like Figure 1 As shown, the main frame 17 of the depalletizing device 1 is in the shape of a rectangular parallelepiped, and a gripping plate 111 of the gripping plate assembly 11 is disposed on the front side of the main frame 17. The gripping plate 111 has a plate surface extending vertically, and its front surface is a rough friction surface, which is used to squeeze and contact the side surface of the cardboard box stack 3. A gripping plate guide rail 112 extending vertically is disposed on the front side of the main frame 17, as shown in FIG. Figure 4 As shown, a grab plate slider 113 is fixed to the rear side of the grab plate 111, and the grab plate slider 113 is arranged on the grab plate guide rail 112, so that the grab plate 111 can be vertically lifted and lowered along the grab plate guide rail 112. The grab plate assembly 11 also includes a grab plate cylinder 114 for driving the grab plate 111 to lift and lower. The grab plate cylinder 114 is arranged in the main frame 17 and is fixedly connected to the top surface of the main frame 17. A piston connector 115 is provided at its piston, and the other end of the piston connector 115 is connected to the rear side of the grab plate 111. The piston of the grab plate cylinder 114 moves vertically and drives the grab plate 111 to move synchronously. When the grab plate 111 rises, the grab plate 111 can grab the cardboard box 31 acting on the friction surface upwards through friction force, refer to Figure 6 shown.

[0035] The pressing plate assembly 12 includes a pressing plate 121, a pressing plate guide rail 124, a pressing plate slider 123, a pressing plate connecting plate 122 and a pressing plate cylinder 128, etc. Figure 2 and Figure 3 As shown. The plate surface of the pressing plate 121 extends horizontally, and it is arranged on the side of the friction surface of the grab plate 111. The connecting plate of the pressing plate 121 connects the upper surface of the pressing plate 121 with the pressing plate slider 123. The pressing plate slider 123 is slidably arranged on the pressing plate guide rail 124. The pressing plate guide rail 124 is vertically extended and arranged on the left and right sides of the main frame 17. This embodiment has two parallel pressing plate cylinders 128. The pressing plate cylinder 128 is a driving device for driving the pressing plate 121 to rise and fall and slide. It is located inside the main frame 17 and is rotatably connected to the top surface of the main frame 17. Its piston is connected to the middle part of a pressing plate pull rod 127 perpendicular to it. The two ends of the pressing plate pull rod 127 extend to the left and right sides of the main frame 17 respectively and are connected to the middle part of a pressing plate swing rod 126 respectively. One end of the pressing plate swing rod 126 is connected to the pressing plate slider 123, and the other end is rotatably connected to the side of the main frame 17. The platen cylinder 128 drives the platen pull rod 127, the platen pull rod 127 drives the platen swing rod 126, the platen swing rod 126 drives the platen slider 123, the platen slider 123 drives the platen 121 to move up and down, refer to Figure 2 and Figure 7 .

[0036] The suction cup assembly 13 can suck up a single carton 31 by suction, and its structure includes a suction cup 131 and a suction cup mounting plate 132. Figure 2 and Figure 3As shown. The plate surface of the suction cup mounting plate 132 extends laterally, and a plurality of suction cups 131 are mounted on the lower surface of the suction cup mounting plate 132. The suction cup assembly 13 also includes an arched suction cup cylinder mounting frame 133, the arch foot of the suction cup cylinder mounting frame 133 is fixedly connected to the pressure plate 121, and a downward suction cup cylinder 134 is installed below the arched portion of the suction cup cylinder mounting frame 133, and the piston of the suction cup cylinder 134 is connected to the above-mentioned suction cup mounting plate 132, so that the suction cup mounting plate 132 and the suction cups 131 mounted thereon can be driven to move up and down relative to the pressure plate 121. A hollow portion 125 is opened in the middle of the pressure plate 121, and the suction cup mounting plate 132 can pass through the hollow portion 125 when it is raised or lowered. Figure 8 shown.

[0037] The plug board 141 of the plug board assembly 14 is arranged on the lower side of the main frame 17, as shown in FIG. Figure 2 As shown, the plate surface of the plug plate 141 extends horizontally and can move horizontally. The horizontal movement range of the plug plate 141 is from being completely located behind the friction surface of the gripping plate 111 to being at least partially located in front of the friction surface. The side of the main frame 17 is provided with a plug plate guide rail 144 extending in the front-to-back direction. The plug plate guide rail 144 is provided with a plug plate slider 143 that can slide along it. The plug plate connecting piece 142 fixes the plug plate slider 143 and the plug plate 141 together. Figure 5 As shown, the plate assembly 14 also includes a first plate cylinder 145 and a second plate cylinder 146 disposed in the main frame 17. The first plate cylinder 145 is fixed to the rear side of the main frame 17 and its piston faces the front side of the main frame 17. The second plate cylinder 146 is fixed to the upper surface of the plate 141 and its piston faces the rear side of the main frame 17. The Z-shaped piston connecting piece 147 connects the piston of the first plate cylinder 145 with the piston of the second plate cylinder 146. The extension of the pistons of the first plate cylinder 145 and the second plate cylinder 146 can drive the plate 141 to move forward and insert into the gap of the cardboard box stack 3, as shown in FIG. Figure 7 shown.

[0038] The fork stacking plate assembly 15 is used to fork the stacking plate 32 after the destacking is completed and transport it to the stacking plate collection area. Figure 4The fork plate assembly 15 includes a pair of fork plate swing rods 152 and a pair of fork plate swing arms 151. The fork plate swing arms 151 are arranged at the rear side of the main frame 17 and are swingably connected to the fork plate swing shaft 153 extending forward and backward. One end of the fork plate swing arm 151 is fixedly connected to the fork plate swing rod 152 so that the two are in an L shape. The fork plate swing rod 152 can swing between the side of the cardboard box stack 3 and the bottom of the stacking plate 32 under the drive of the fork plate swing arm 151. The end of the fork plate swing arm 151 away from the fork plate swing rod 152 is provided with a chute 154 extending in the length direction. The fork plate assembly 15 also includes a lifting rod 155 and a fork plate cylinder 157. The lifting rod 155 passes through the chute 154 to string the two fork plate swing arms 151 together. A fork plate guide rail 158 is provided at the rear side of the main frame 17, and a fork plate slider 156 is provided on the fork plate guide rail 158. One end of the fork plate slider 156 is connected to the piston of the fork plate cylinder 157, and the other end is connected to the lifting rod 155, so that the piston of the fork plate cylinder 157 can drive the lifting rod 155 to rise and fall vertically. When the lifting rod 155 rises, the two fork plate swing rods 152 are clamped inwardly, referring to Fig. 9 When the lifting rod 155 descends, the two fork stacking plate swing rods 152 are loosened outwards. Fig.10 .

[0039] An interface flange 16 is installed on the top side of the main frame 17, and the interface flange 16 is used to connect the depalletizing device 1 with other components of the depalletizing system.

[0040] The working principle of this embodiment:

[0041] AGV2 transports the cardboard box stack 3 to the depalletizing station, which is provided with a baffle 5, and the cardboard box stack 3 is placed close to the baffle 5. Figure 6 As shown. The front side of the depalletizing device 1 is close to the back side of the cardboard box stack 3, and there is a squeezing effect between the gripping plate 111 and the side of the stacked cardboard boxes 31. Then the piston of the gripping plate cylinder 114 is controlled to retract to move the gripping plate 111 upward. The gripping plate 111 grabs the stacked cardboard boxes 31 in contact with it through friction, and a gap is generated between the grabbed part of the cardboard boxes 31 and the remaining cardboard boxes 31. Then the pistons of the first plugging plate cylinder 145 and the second plugging plate cylinder 146 are controlled to extend, and the plugging plate 141 is driven to move forward and inserted into the generated gap. Then the piston of the pressing plate cylinder 128 is controlled to extend, as shown. Figure 7 As shown, the pressing plate 121 is driven to move down to press the picked-up cartons 31, and then the entire depalletizing device 1 rises and moves forward over the baffle plate 5 to transport the cartons 31 to the carton conveyor belt 4. The above process is repeated until the remaining cartons 31 in this column are not thick enough to be picked up by the grab plate 111.

[0042] Next reference Figure 8, the piston of the pressing plate cylinder 128 is controlled to extend, thereby driving the pressing plate 121 to press down, and then the piston of the suction cup cylinder 134 is controlled to extend, thereby driving the suction cup mounting plate 132 to extend downward from the hollow of the pressing plate 121, and the suction cup 131 contacts the cardboard box 31, and the remaining cardboard boxes 31 are sucked up by vacuuming, and then transported to the cardboard box conveyor belt 4 or stacked on top of another row of cardboard boxes 31. This is repeated until the cardboard boxes 31 in this row are completely emptied.

[0043] After the cardboard box stack 3 is disassembled according to the above steps, the depalletizing device 1 is close to the empty stacking plate 32, the piston of the fork stacking plate cylinder 157 is retracted, and the two fork stacking plate swing rods 152 are retracted inwardly and can extend under the stacking plate 32. Fig. 9 The destacking device 1 picks up the stack 32 and transports it to the stack collection area for stacking. Then the destacking device 1 moves backward to release the stack 32. Fig.10 , the piston of the fork stacking plate cylinder 157 extends downward, and the two fork stacking plate swing rods 152 open outward and upward to avoid interference with the subsequent destacking work.

Claims

1. A depalletizing device for cardboard boxes, comprising a device frame, characterized in that it comprises A gripping plate assembly (11) comprises a gripping plate (111) extending vertically from a plate surface, the gripping plate (111) having a rough friction surface, the friction surface being in compression contact with the side surface of the cardboard box stack (3), the gripping plate (111) being able to rise and fall vertically, and when the gripping plate (111) rises, it grabs the cardboard box (31) acting on the friction surface upwards by friction force; A pressure plate assembly (12) comprises a pressure plate (121) with a plate surface extending transversely, and the pressure plate (121) is arranged on the side of the friction surface of the gripping plate (111) in a manner that allows it to be lifted and lowered; The insert plate assembly (14) comprises an insert plate (141) extending transversely from the plate surface. The insert plate (141) is disposed below the gripping plate (111) in a transversely movable manner. The transverse movement range of the insert plate (141) is from being completely located behind the friction surface to being at least partially located in front of the friction surface.

2. The destacking device according to claim 1, characterized in that: The invention also comprises a suction cup assembly (13), wherein the suction cup assembly (13) comprises a suction cup (131) and a suction cup mounting plate (132) for mounting the suction cup (131), wherein the plate surface of the suction cup mounting plate (132) extends laterally and is arranged on the front side of the friction surface in a manner that it can be lifted and lowered vertically.

3. The destacking device according to claim 2, characterized in that: The pressing plate (121) has a hollow portion (125) in the middle, and the suction cup mounting plate (132) can pass through the hollow portion (125) when being raised or lowered.

4. The depalletizing device according to any one of claims 1 to 3, characterized in that: The invention also comprises a fork stacking plate assembly (15), comprising a fork stacking plate swing rod (152) and a fork stacking plate swing arm (151). The fork stacking plate swing arm (151) is swingably connected to a fork stacking plate swing shaft (153) perpendicular to the friction surface. One end of the fork stacking plate swing arm (151) is fixedly connected to the fork stacking plate swing rod (152) so that the two are in an L shape. The fork stacking plate swing rod (152) can swing between the side of the cardboard box stack (3) and the bottom of the stacking plate (32) under the drive of the fork stacking plate swing arm (151).

5. The destacking device according to claim 4, characterized in that: The fork stacking plate assembly (15) comprises two symmetrically arranged fork stacking plate swing arms (151), each of the two fork stacking plate swing arms (151) is fixedly connected to a fork stacking plate swing rod (152), and a slide groove (154) extending along the length direction is formed at one end of the fork stacking plate swing arm (151) away from the fork stacking plate swing rod (152). The fork stacking plate assembly (15) further comprises a lifting rod (155) and a fork stacking plate cylinder (157), the lifting rod (155) passes through the slide groove (154) to string the two fork stacking plate swing arms (151) together, and the piston of the fork stacking plate cylinder (157) drives the lifting rod (155) to vertically lift.

6. The destacking device according to claim 5, characterized in that: The device frame has a main frame (17) in the shape of a rectangular parallelepiped, the auxiliary structures of the depalletizing device are directly or indirectly arranged on the main frame (17), the grab plate (111) is installed on the front side of the main frame (17), the swing arm is installed on the rear side of the main frame (17), the plug plate (141) is installed on the lower side of the main frame (17), and the top surface of the main frame (17) is provided with an interface flange (16) for connecting with other components of the depalletizing system.

7. The destacking device according to claim 6, characterized in that: A vertically extending grab plate guide rail (112) is provided on the front side of the main frame (17); a grab plate slider (113) is fixed on the rear side of the grab plate (111); the grab plate slider (113) is arranged on the grab plate guide rail (112); the grab plate assembly (11) further comprises a grab plate cylinder (114); the grab plate cylinder (114) is inside the main frame (17) and is fixedly connected to the top surface of the main frame (17); a piston of the grab plate cylinder (114) is provided with a piston connector (115) connected to the grab plate at one end; the other end of the piston connector (115) is connected to the rear side of the grab plate (111); the piston of the grab plate cylinder (114) moves vertically and drives the grab plate (111) to move synchronously.

8. The destacking device according to claim 7, characterized in that: The side of the main frame (17) is provided with a vertically extending pressure plate guide rail (124), the pressure plate (121) is fixed to the pressure plate slider (123), and the pressure plate slider (123) is arranged on the pressure plate guide rail (124). The pressure plate assembly (12) also includes a pressure plate cylinder (128), a pressure plate pull rod (127) and two pressure plate rocker rods (126). The pressure plate cylinder (128) is inside the main frame (17) and is rotatably connected to the top surface of the main frame (17). The piston of the pressure plate cylinder (128) is connected to the middle part of the pressure plate pull rod (127), and the two ends of the pressure plate pull rod (127) are respectively connected to the middle parts of the two pressure plate rocker rods (126). One end of the pressure plate rocker rod (126) is connected to the pressure plate slider (123), and the other end is rotatably connected to the side of the main frame (17).

9. The destacking device according to claim 8, characterized in that: A laterally extending plugboard guide rail (144) is provided on the side of the main frame (17); the plugboard (141) is fixed to a plugboard slider (143); the plugboard slider (143) is arranged on the plugboard guide rail (144); the plugboard assembly (14) further comprises a first plugboard cylinder (145) and a second plugboard cylinder (146) in the main frame (17); the first plugboard cylinder (145) is fixed to the rear side of the main frame (17) and its piston faces the front side of the main frame (17); the second plugboard cylinder (146) is fixed to the upper surface of the plugboard (141) and its piston faces the rear side of the main frame (17); and a piston connecting piece (147) connects the piston of the first plugboard cylinder (145) with the piston of the second plugboard cylinder (146).

10. A depalletizing system for cartons, characterized in that: The destacking device according to any one of claims 1 to 9 is used.

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