Partition plate placing device

The mechanical system with vacuum grippers addresses the inefficiencies of manual spacer placement by automating the process, improving stability and efficiency in paperboard stacking.

CN223102095UActive Publication Date: 2025-07-15HESHAN LIANXING PAPER PROD CO LTD
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Patent Information

Application Number
CN202422384814.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-29
Publication Date
2025-07-15
Estimated Expiration
2034-09-29

AI Technical Summary

Technical Problem

During the traditional cardboard stacking process, relying on manual placement of partitions leads to high labor intensity and long-term labor, affecting production efficiency and insufficient stability.

Method used

A partition placement device is designed to move the partition on the slide rail by a robot, automatically place the partition on the stacked cardboard, and use vacuum suction cups and load transfer components to realize automatic partition placement.

Benefits of technology

Reduce labor intensity, improve production efficiency, enhance the stability of cardboard stacking, reduce maintenance costs, and extend the service life of suction cup mechanism.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a partition plate placing device which comprises a first conveying table, a second conveying table and a machine frame arranged above the second conveying table, a cross beam is arranged on the front end face of the machine frame, and a transferring box capable of horizontally sliding in the length direction of the cross beam is arranged on the cross beam. A manipulator assembly for grabbing a partition plate is mounted on the bottom surface of the transfer box in a liftable manner; the manipulator assembly comprises a telescopic piece arranged in the transfer box, and the telescopic end of the telescopic piece extends to the position below the transfer box and is fixedly connected with a support. The device at least comprises a suction cup mechanism which is vertically arranged on a support, and the suction cup mechanism at least comprises a vacuum suction cup used for adsorbing a partition plate; and the vacuum part is arranged in the transfer box. According to the partition plate placing device, the partition plates can be automatically placed on the stacked paperboards through accurate movement of the mechanical arm on the sliding rail, manpower is reduced, meanwhile, shaking of the paperboards in the stacking process can be effectively prevented, and the overall stability is enhanced.
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Description

Technical Field

[0001] The utility model relates to the technical field of cardboard processing, and particularly relates to a partition placing device. Background Art

[0002] In industries such as cardboard processing, after the cardboard is processed, it needs to be stacked on a pallet. As the stacking height of the cardboard increases, the stacked cardboard is prone to being disturbed and shaking or even collapsing. Placing partitions between the cardboard can effectively disperse the pressure, increase the overall stability of the stack, and prevent collapse caused by shaking or external forces.

[0003] However, the traditional partition placing method mostly relies on manual operation, that is, the cardboard is stacked on the pallet, and after reaching a certain height, the worker manually places the partition between the cardboard to increase the stability of the cardboard stack. Although this method solves the problems of shaking and collapse during the cardboard stacking process to a certain extent, as the stacking height of the cardboard increases, the worker needs to continuously bend down and lift the hand to place the partition, resulting in a relatively large labor intensity during long-term operation, and the process of placing the partition takes a long time, thus affecting the overall production efficiency. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the utility model provides a partition placing device, which can automatically place the partition on the stacked cardboard through the precise movement of the manipulator on the slide rail, reducing the manpower. At the same time, it can effectively prevent the shaking during the cardboard stacking process and enhance the overall stability.

[0005] A partition placing device according to an embodiment of the utility model includes a first conveyor table, a second conveyor table, and a frame arranged above the second conveyor table. A cross beam is arranged on the front end face of the frame, and a transfer box that can slide horizontally along its length direction is arranged on the cross beam. A manipulator assembly for grasping the partition is installed on the bottom surface of the transfer box in a liftable manner;

[0006] The manipulator assembly includes,

[0007] A telescopic member, which is arranged inside the transfer box, and its telescopic end extends below the transfer box and is fixedly connected with a bracket;

[0008] At least one suction cup mechanism, which is arranged vertically on the bracket, and the suction cup mechanism at least includes a vacuum suction cup for adsorbing the partition;

[0009] A vacuum component, which is arranged inside the transfer box and is used to control the vacuum suction cup to generate a negative pressure adsorption force.

[0010] According to some embodiments of the utility model, it further includes a transfer assembly arranged inside the transfer box for driving the transfer box to horizontally displace along the cross beam;

[0011] The transfer component includes

[0012] A rack, horizontally arranged on the front end face of the crossbeam;

[0013] A driving motor, fixedly installed inside the transfer box, and its driving end is fixedly connected with a gear meshing with the rack.

[0014] According to some embodiments of the present invention, the suction cup mechanism further includes

[0015] A connecting part, fixedly arranged at the top end of the vacuum suction cup;

[0016] A sleeve, threadedly connected to the outer wall of the connecting part, and a filter screen is installed inside it;

[0017] A hollow tube, having a structure with one end open and the other end closed, and the open end of the hollow tube is threadedly connected inside the sleeve;

[0018] The inner cavities of the connecting part, the sleeve and the hollow tube are mutually communicated.

[0019] According to some embodiments of the present invention, an air connection port is arranged on the side wall of the hollow tube, and the vacuum component includes

[0020] A vacuum pump, installed inside the transfer box;

[0021] A main pipeline, connected to the negative pressure end of the vacuum pump;

[0022] A sub-pipeline, fixedly installed on the bracket, one end of which is communicated with the main pipeline, and the other end of which is communicated with the air connection port.

[0023] According to some embodiments of the present invention, a screw rod is fixedly installed on the top of the hollow tube, the screw rod passes through the bracket, and a nut is threadedly connected to the outer wall of the screw rod, and the screw rod is fixed to the bracket through the nut.

[0024] According to some embodiments of the present invention, the filter screen has a Z-shaped structure, the bottom surface of the filter screen abuts against the top surface of the connecting part, and the top surface of the filter screen abuts against the bottom surface of the hollow tube.

[0025] According to some embodiments of the present invention, the telescopic member is a cylinder, the cylinder barrel of the cylinder is fixedly installed at the inner bottom of the transfer box, and its piston end penetrates through the bottom wall of the transfer box and extends downward and is fixedly connected to the bracket.

[0026] According to some embodiments of the present invention, it further includes a placement table for placing partitions arranged on the side of the first conveyor table, and a protective grille is arranged around the outer periphery of the placement table.

[0027] According to some embodiments of the present utility model, a swing arm is rotatably installed on the bracket, the suction cup mechanism is installed at one end of the swing arm, a locking bolt is arranged at the other end of the swing arm, and the swing arm is fixed to the bracket by the locking bolt.

[0028] According to some embodiments of the present utility model, the number of the suction cup mechanisms is four, and the four suction cup mechanisms are respectively arranged at the four corner positions of the bracket.

[0029] A partition placing device according to an embodiment of the present utility model has at least the following beneficial effects:

[0030] 1. By arranging the transplanting assembly, the present utility model can drive the manipulator assembly to automatically grab the partition, and can complete the automatic partition placement, reduce the labor intensity, reduce the labor cost, improve the production safety and reliability at the same time, effectively prevent the shaking and collapse during the cardboard stacking process, and improve the overall stability.

[0031] 2. By connecting the hollow tube with the vacuum component, when the vacuum component is started, the air inside the hollow tube, the sleeve, the connecting part and the vacuum suction cup can be extracted, so that the inside thereof is in a vacuum state, and the vacuum suction cup is adsorbed and fixed on the partition. And a filter screen is arranged inside the sleeve to avoid a large amount of dust in the air and debris and impurities on the cardboard being inhaled, causing blockage, prolong the service life of the suction cup mechanism, and reduce the maintenance cost.

[0032] 3. By designing the filter screen in a Z shape, the present utility model can more effectively intercept dust and impurities, and the Z-shaped filter screen may have a smaller flow resistance, thereby reducing the loss of negative pressure and improving the operation efficiency of negative pressure adsorption.

[0033] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0036] Figure 2 It is a schematic diagram of the connection structure between the transfer assembly and the manipulator assembly in the present utility model;

[0037] Figure 3 This is a schematic structural diagram of the manipulator assembly in the present utility model;

[0038] Figure 4 This is a front view structural schematic diagram of the suction cup mechanism in the present utility model;

[0039] Figure 5 This is a cross-sectional structural schematic diagram of the suction cup mechanism in the present utility model.

[0040] Reference numerals: 1, first conveying table; 2, second conveying table; 3, frame; 4, cross beam; 5, transfer box; 6, rack; 7, drive motor; 8, gear; 9, sliding seat; 10, slide rail; 11, telescopic member; 12, bracket; 13, vacuum pump; 14, main pipeline; 15, suction cup mechanism; 151, vacuum suction cup; 152, connecting portion; 153, sleeve; 154, filter screen; 155, hollow pipe; 156, air connection port; 157, screw; 158, nut; 16, auxiliary pipeline; 17, placing table; 18, protective grille; 19, swing arm; 20, locking bolt. Detailed implementation manners

[0041] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0042] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0043] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If the first and the second are described, this is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0044] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation, connection, and coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0045] The following describes a partition placing device according to an embodiment of the present utility model with reference to the accompanying drawings.

[0046] Referring to Figures 1 - 5 , an embodiment of a partition placing device is provided by the present utility model.

[0047] A partition placing device according to an embodiment of the present utility model includes a first conveyor table 1, a second conveyor table 2, and a frame 3 disposed above the second conveyor table 2. A cross beam 4 is provided on the front end face of the frame 3, and a transfer box 5 that can slide horizontally along its length direction is provided on the cross beam 4. A manipulator assembly for grasping partitions is installed on the bottom surface of the transfer box 5 in a liftable manner.

[0048] The manipulator assembly includes

[0049] a telescopic member 11, which is disposed inside the transfer box 5, and its telescopic end extends below the transfer box 5 and is fixedly connected to a bracket 12;

[0050] at least one suction cup mechanism 15, which is vertically disposed on the bracket 12, and the suction cup mechanism 15 at least includes a vacuum suction cup 151 for adsorbing partitions;

[0051] a vacuum component, which is disposed inside the transfer box 5 and is used to control the vacuum suction cup 151 to generate a negative pressure adsorption force.

[0052] Specifically, the first conveyor table 1 and the second conveyor table 2 cooperate to convey a stack of cardboard to a cardboard stacking device, and then the cardboard stacking device stacks the stack of cardboard on a tray.

[0053] When the cardboard is stacked to the specified height, the cardboard being conveyed on the first conveyor table 1 and the second conveyor table 2 stays between the first conveyor table 1 and the second conveyor table 2. By sliding the transfer box 5 on the cross beam 4, the bracket 12 can be controlled to laterally displace towards the partition to be placed. When the bracket 12 moves above the partition, the telescopic member 11 can control the bracket 12 to vertically displace towards the partition to be placed, so that the vacuum suction cup 151 tightly abuts against the upper surface of the partition. The vacuum component can drive the vacuum suction cup 151 to generate a negative pressure adsorption force, and then the partition can be adsorbed and grasped. Then, by controlling the bracket 12 to laterally move above the cardboard and controlling the partition to vertically move above the stack of cardboard through the telescopic member 11, and the vacuum component controls the vacuum suction cup 151 to release the adsorption, the partition can be placed on the cardboard. Then, the cardboard with the partition is conveyed to the cardboard stacking device through the second conveyor table 2, and the cardboard stacking device can stack the cardboard with the partition on the tray, thus realizing the effect of automatic placement of the partition.

[0054] It should be noted that the first conveyor table 1 includes a frame body, rollers rotatably arranged at equal intervals along the length direction of the frame body, and a driving device for driving the rollers to rotate on the frame body. When the driving device drives the rollers to rotate, the cardboard placed on the first conveyor table 1 can be conveyed. And the second conveyor table 2 has the same structure as the first conveyor table 1. Both the first conveyor table 1 and the second conveyor table 2 have a cardboard input end and a cardboard output end. The first conveyor table 1 and the second conveyor table 2 have the same height, and the cardboard output end of the first conveyor table 1 corresponds to the cardboard input end of the second conveyor table 2. When the cardboard is conveyed from the cardboard input end of the first conveyor table 1 to the cardboard output end, the cardboard at this time will move to the cardboard input end of the second conveyor table 2. The partition can be placed on the cardboard through the cooperation of the transfer assembly and the manipulator assembly, and the cardboard stacked with the partition can be conveyed to the cardboard stacking device through the second conveyor table 2.

[0055] Refer to Figures 1 - 2 In a further embodiment of the present utility model, it further includes a transfer assembly arranged inside the transfer box 5 for driving the transfer box 5 to horizontally displace along the cross beam 4;

[0056] The transfer assembly includes,

[0057] A rack 6, horizontally arranged on the front end face of the cross beam 4;

[0058] A driving motor 7, fixedly installed inside the transfer box 5, and its driving end is fixedly connected with a gear 8 meshing with the rack 6.

[0059] Specifically, the driving motor 7 can drive the gear 8 to rotate. During the rotation of the gear 8, it rolls and meshes with the rack 6, so that the transfer box 5 can horizontally displace along the length direction of the cross beam 4. The manipulator assembly installed on the transfer box 5 can be driven by the transfer box 5 to move, thus realizing the effect of fully automatic placement of the partition.

[0060] It should be noted that: symmetrically arranged sliding rails 10 are further provided on the front end face of the cross beam 4. A sliding seat 9 is fixedly connected to the back surface of the transfer box 5, and the sliding seat 9 is slidably connected to the sliding rails 10. The cooperation of the sliding seat 9 and the sliding rails 10 can guide the sliding of the transfer box 5 and improve the stability of the sliding of the transfer box 5.

[0061] Referring to Figures 3 - 5 , in a further embodiment of the present invention, the suction cup mechanism 15 further includes,

[0062] a connecting portion 152, fixedly provided at the top end of the vacuum suction cup 151;

[0063] a sleeve 153, threadedly connected to the outer wall of the connecting portion 152, and a filter screen 154 is installed inside it;

[0064] a hollow tube 155, having a structure with one end open and the other end closed. The open end of the hollow tube 155 is threadedly connected to the inside of the sleeve 153;

[0065] The inner cavities of the connecting portion 152, the sleeve 153, and the hollow tube 155 are in communication with each other.

[0066] Specifically, by connecting the hollow tube 155 to the vacuum component, when the vacuum component is started, the air inside the hollow tube 155, the sleeve 153, the connecting portion 152, and the vacuum suction cup 151 can be extracted, and then the inside thereof is in a vacuum state, so that the vacuum suction cup 151 is adsorbed and fixed on the partition board. Moreover, the filter screen 154 provided inside the sleeve 153 can prevent a large amount of dust in the air, as well as debris and impurities on the cardboard, from being sucked in, causing blockage, prolonging the service life of the suction cup mechanism 15, and reducing the maintenance cost.

[0067] Referring to Figures 2 - 5 , in a further embodiment of the present invention, an air connection port 156 is provided on the side wall of the hollow tube 155, and the vacuum component includes,

[0068] a vacuum pump 13, installed inside the transfer box 5;

[0069] a main pipeline 14, connected to the negative pressure end of the vacuum pump 13;

[0070] a sub - pipeline 16, fixedly installed on the bracket 12, one end of which is communicated with the main pipeline 14, and the other end of which is communicated with the air connection port 156.

[0071] Specifically, through the cooperation of the vacuum pump 13, the main pipeline 14, and the air connection port 156, the air inside the sleeve 153, the connecting portion 152, and the vacuum suction cup 151 can be extracted, and then the vacuum suction cup 151 can be quickly driven to generate a negative pressure adsorption force. Moreover, the vacuum component is installed inside the transfer box 5 and can move synchronously with the transfer box 5, reducing the installation space and improving the overall integration degree.

[0072] Reference Figures 3 - 4 In a further embodiment of the utility model, a screw 157 is fixedly installed on the top of the hollow tube 155, the screw 157 is passed through the bracket 12, a nut 158 is threadedly connected to the outer wall of the screw 157, and the screw 157 is fixed to the bracket 12 through the nut 158.

[0073] Specifically, the screw rod 157 and the nut 158 cooperate to facilitate the assembly of the suction cup mechanism 15 on the bracket 12 .

[0074] Reference Figure 5 In a further embodiment of the present invention, the filter screen 154 is in a Z-shaped structure, the bottom surface of the filter screen 154 abuts against the top surface of the connecting portion 152 , and the top surface of the filter screen 154 abuts against the bottom surface of the hollow tube 155 .

[0075] Specifically, by designing the filter 154 into a Z-shape, dust and impurities can be more effectively intercepted, and the Z-shaped filter 154 may have a smaller flow resistance, thereby reducing the loss of negative pressure and improving the operating efficiency of negative pressure adsorption.

[0076] Reference Figure 2 In a further embodiment of the utility model, the telescopic member 11 is a cylinder, the cylinder barrel of which is fixedly mounted on the inner bottom of the transfer box 5 , and the piston end thereof extends downward through the bottom wall of the transfer box 5 and is fixedly connected to the bracket 12 .

[0077] Specifically, the bracket 12 can be conveniently controlled to be lifted and lowered vertically by the telescopic member 11 , and the telescopic member 11 can be changed to an electric push rod or a hydraulic cylinder according to actual installation requirements and usage requirements.

[0078] Reference Figure 1 In a further embodiment of the utility model, a placement table 17 for placing partitions is provided on the side of the first conveying platform 1, and a protective grille 18 is provided on the outer periphery of the placement table 17.

[0079] Specifically, a plurality of partitions can be stacked and placed next to the first conveyor platform 1 through the placement table 17 and the protective grille 18, thereby reducing the number of manual loading times and facilitating use by operators.

[0080] Reference Figure 3 In a further embodiment of the utility model, a swing arm 19 is rotatably mounted on the bracket 12, the suction cup mechanism 15 is mounted on one end of the swing arm 19, and a locking bolt 20 is provided at the other end of the swing arm 19, and the swing arm 19 is fixed to the bracket 12 by the locking bolt 20.

[0081] Specifically, the position of the suction cup mechanism 15 can be adjusted by the swing arm 19, and the position of the swing arm 19 can be fixed by the locking bolt 20, so that the position of the suction cup mechanism 15 can be adjusted according to actual needs.

[0082] Referring to Figure 3 , in a further embodiment of the present invention, the number of the suction cup mechanisms 15 is four, and the four suction cup mechanisms 15 are respectively arranged at the four corner positions of the bracket 12.

[0083] Specifically, the partition is adsorbed and grabbed by the four suction cup mechanisms 15 at the same time, so as to improve the stability of grabbing and moving the partition.

[0084] In the description of this specification, the description of reference terms such as "one embodiment, some embodiments, illustrative embodiments, examples, specific examples or some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0085] The embodiments of the present invention have been described in detail above with reference to the drawings, but the present invention is not limited to the above embodiments. Various changes can be made without departing from the spirit of the present invention within the knowledge scope of those of ordinary skill in the art.

Claims

1. A partition placing device, comprising a first conveying table (1), a second conveying table (2), and a frame (3) arranged above the second conveying table (2), characterized in that: A crossbeam (4) is provided on the front end face of the frame (3). A transfer box (5) capable of horizontally sliding along its length direction is provided on the crossbeam (4). A manipulator assembly for grasping partition boards is installed on the bottom surface of the transfer box (5) in a liftable manner; The manipulator assembly includes: A telescopic member (11) is provided inside the transfer box (5), and its telescopic end extends below the transfer box (5) and is fixedly connected to a bracket (12); At least one suction cup mechanism (15) is provided vertically on the bracket (12). The suction cup mechanism (15) at least includes a vacuum suction cup (151) for adsorbing partition boards; A vacuum component is provided inside the transfer box (5) and is used to control the vacuum suction cup (151) to generate a negative pressure adsorption force.

2. The partition placing device according to claim 1, characterized in that, It further includes a transfer assembly provided inside the transfer box (5) for driving the transfer box (5) to horizontally displace along the crossbeam (4); The transfer assembly includes: A rack (6) is horizontally provided on the front end face of the crossbeam (4); A driving motor (7) is fixedly installed inside the transfer box (5), and its driving end is fixedly connected to a gear (8) meshing with the rack (6).

3. A partition placing device according to claim 1, characterized in that, The suction cup mechanism (15) further includes: A connecting portion (152) is fixedly provided at the top end of the vacuum suction cup (151); A sleeve (153) is threadedly connected to the outer wall of the connecting portion (152), and a filter screen (154) is installed inside it; A hollow tube (155) has an open end and a closed end. The open end of the hollow tube (155) is threadedly connected to the inside of the sleeve (153); The inner cavities of the connecting portion (152), the sleeve (153), and the hollow tube (155) are mutually communicated.

4. The partition placement device according to claim 3, characterized in that, An air connection port (156) is provided on the side wall of the hollow tube (155). The vacuum component includes: A vacuum pump (13) is installed inside the transfer box (5); A main pipeline (14) is connected to the negative pressure end of the vacuum pump (13); An auxiliary pipeline (16) is fixedly installed on the bracket (12), one end of which is communicated with the main pipeline (14), and the other end of which is communicated with the air connection port (156).

5. The partition placing device according to claim 3, characterized in that, A screw rod (157) is fixedly installed at the top of the hollow tube (155). The screw rod (157) passes through the bracket (12), and a nut (158) is threadedly connected to the outer wall of the screw rod (157). The screw rod (157) is fixed to the bracket (12) through the nut (158).

6. The partition placing device according to claim 3, wherein, The filter screen (154) is in a Z-shaped structure. The bottom surface of the filter screen (154) abuts against the top surface of the connecting portion (152), and the top surface of the filter screen (154) abuts against the bottom surface of the hollow tube (155).

7. The partition placing device according to claim 1, characterized in that, The telescopic member (11) is a cylinder. The cylinder barrel of the cylinder is fixedly installed at the inner bottom of the transfer box (5), and its piston end penetrates through the bottom wall of the transfer box (5) and extends downward and is fixedly connected to the bracket (12).

8. A partition placing device according to claim 1, characterized in that, It further includes a placement table (17) for placing partition boards provided on the side of the first conveyor table (1). A protective grille (18) is provided around the outer periphery of the placement table (17).

9. The partition placing device according to claim 1, characterized in that, A swing arm (19) is rotatably mounted on the bracket (12), the suction cup mechanism (15) is mounted at one end of the swing arm (19), a locking bolt (20) is provided at the other end of the swing arm (19), and the swing arm (19) is fixed to the bracket (12) by the locking bolt (20).

10. A partition placement device according to claim 9, characterized in that, The number of the suction cup mechanisms (15) is four, and the four suction cup mechanisms (15) are respectively arranged at the four corner positions of the bracket (12).