A bag sealing apparatus

Abstract

A packaging bag edge bonding device, a packaging bag edge bonding device, comprising a workbench composed of supporting legs, a table top fixed on the top of the supporting legs, and a force plate fixed on the longer side of the table top, the front side of the force plate is the side of the force plate facing the operating area of the table top, and the front side of the force plate is provided with an inner mold; the bottom pressing plate, the first side pushing plate, the top pushing plate and the third side pushing plate are vertically movably arranged on the table top, the third side pushing plate can also move horizontally along the length direction of the longer side of the table top, the front side of the force plate is provided with a second side pushing plate which can move vertically, and a edge bonding component is also arranged on the table top, the edge bonding component is used for adhering glue to one end of the packaging bag, and is used to solve the technical problems of complex production process, low production efficiency and low product quality in the prior art.

Description

Technical Field

[0001] This utility model relates to the technical field of packaging bag processing equipment, and in particular to a packaging bag edge-sealing device. Background Technology

[0002] Paper packaging bags are widely used in the current market due to their advantages such as environmental friendliness, cost-effectiveness, and ease of processing. For example, kraft paper packaging bags that are easy to carry are made by folding and gluing the edges of paper materials to form a bag-like structure for holding goods.

[0003] Existing technology, such as the utility model patent document with authorization announcement number "CN215826089U" and patent name "A pressing device for folding the edge of a paper packaging bag", discloses a pressing device for folding the edge of a paper packaging bag. The device includes a side plate, a roller shaft, a servo motor, a transmission roller, a transmission wheel, an adjustment structure, and a pressing device. The roller shaft is disposed between two side plates, and both ends of the roller shaft are rotatably connected to the side plates respectively. A servo motor for driving the roller shaft is installed on the side plate. The top of the side plate is provided with a groove, and the adjustment structure is disposed in the groove. The transmission roller is installed between the two adjustment structures.

[0004] The aforementioned production method necessitates that the production of paper packaging bags requires the folded edges to be fixed before being transferred to specialized bonding equipment. There, the folded edges are bonded and fixed through methods such as applying glue, heating, or applying pressure. Therefore, this process needs to be completed in two separate steps.

[0005] This approach has significant drawbacks: Firstly, separating the two processes requires additional equipment transfer or conveying, increasing not only the investment cost of production equipment and workshop floor space but also extending the production cycle. Secondly, during process transfer, the already compressed folds are prone to positional shifts or deformations due to external forces, leading to decreased alignment accuracy during subsequent bonding and consequently affecting the quality of the packaged bags and increasing the defect rate. Furthermore, process separation makes it difficult to increase the automation level of the production process, requiring more manpower for equipment operation and material transfer, further reducing production efficiency and failing to meet the demands of modern production lines for efficient and continuous production. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a packaging bag edge-sealing device to solve the technical problems of complex production processes, low production efficiency, and low product quality in existing technologies.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A packaging bag edge-sealing device includes a worktable consisting of support legs, a table fixed to the top of the support legs, and a force-bearing plate fixed to the longer side of the table. The front of the force-bearing plate is the side facing the operating area of ​​the table, and an inner mold is provided on the front of the force-bearing plate. A bottom pressure plate, a first side push plate, a top push plate, and a third side push plate are vertically movable on the table. The third side push plate can also move horizontally along the length of the longer side of the table. A second side push plate is vertically movable on the front of the force-bearing plate. An edge-folding adhesive component is also provided on the table for adhering glue to one end of the packaging bag. The bottom pressure plate, the first side push plate, the top push plate, the third side push plate, and the second side push plate work together to shape the four edges of the packaging paper. When the two ends of the paper material are glued together, a cylindrical packaging bag body is formed.

[0008] Working principle: In use, place the strip-shaped packaging bag on the table with the inside of the bag facing upwards. Then, move the bottom pressure plate vertically upwards, lifting and pushing the packaging bag (the part in contact with the bottom pressure plate) against the bottom surface of the inner mold. At this point, the part of the packaging bag not in contact with the bottom pressure plate will slightly tilt upwards. Next, move the first side push plate vertically upwards, contacting the packaging bag (the right side part not in contact with the bottom surface of the inner mold), causing this part of the packaging bag to fold upwards. As the first side push plate continues to push this part of the packaging bag, this part of the packaging bag will adhere to the right side of the inner mold. Then, move the top push plate vertically upwards. After moving a certain distance, move the top push plate to the left, contacting the packaging bag (the upper part not in contact with the right side of the inner mold), causing this part of the packaging bag to fold to the left. As the top push plate continues to push this part of the packaging bag, this part of the packaging bag will adhere to the top surface of the inner mold. Finally, move the first side push plate vertically downwards. The three-sided push plate contacts the packaging bag (the left side portion not in contact with the top surface of the inner mold), causing that portion of the packaging bag to fold downwards. As the third-sided push plate continues to push that portion of the packaging bag, it adheres to the left side of the inner mold. Subsequently, the folding and bonding component adheres glue to the end face of the packaging bag (the left side portion not in contact with the bottom surface of the inner mold), and the second-sided push plate moves vertically upwards. The second-sided push plate contacts the packaging bag (the left side portion not in contact with the bottom surface of the inner mold), causing that portion of the packaging bag to fold upwards. As the second-sided push plate continues to push that portion of the packaging bag, it adheres to the left side of the inner mold, and the end face of the packaging bag with adhesive adheres to the other end face that is in contact with the left side of the inner mold. Thus, the four edges of the packaging paper are formed, creating a cylindrical packaging bag body.

[0009] Beneficial effects: This invention integrates the traditional two separate processes of "folding and pressing" and "adhesive fixing" into a single process by coordinating a bottom pressure plate, a first side push plate, a top push plate, a third side push plate, a second side push plate, and an edge-folding and bonding component on the workbench and the load-bearing plate. During the process of multiple push plates working in conjunction with the inner mold to gradually fold and form the four edges of the packaging paper, the edge-folding and bonding component simultaneously adheres glue to the designated end face of the packaging bag. Then, through the pushing action of the second side push plate, the adhesive end face is directly bonded to the corresponding bonding surface, ultimately forming a cylindrical packaging bag body in one step. This design eliminates the equipment transfer and material handling steps required in traditional processes, effectively shortening the production cycle, reducing equipment investment costs and workshop floor space, and meeting the needs of efficient and continuous production lines in modern manufacturing. Attached Figure Description

[0010] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0011] In the above-mentioned attached figures: support leg 11, tabletop 12, force plate 13, inner mold 2, bottom pressure plate 3, first electric telescopic component 31, storage slot 32, first side push plate 4, second electric telescopic component 41, first strip hole 42, first motor 43, first transmission shaft 44, first moving block 45, first limiting rod 46, top push plate 5, third electric telescopic component 51, electric slide rail 52, electric slider 53, third side push plate 6, fourth electric telescopic component 61, second motor 62, second transmission shaft 63, second moving block 64, second limiting rod 65, second side push plate 7, fifth electric telescopic component 71, second strip hole 72, third motor 73, third transmission shaft 74, third moving block 75, third limiting rod 76, and folded edge bonding component 8. Detailed Implementation

[0012] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0013] Example: The utility model discloses a packaging bag edge-sealing device, such as... Figure 1As shown, the core structure is a workbench, which consists of support legs 11, a tabletop 12, and a load-bearing plate 13. The support legs 11 serve as the load-bearing foundation, with the tabletop 12 fixedly mounted on its top. The load-bearing plate 13 is fixedly mounted on the longer side of the tabletop 12, and the side of the load-bearing plate 13 facing the operating area of ​​the tabletop 12 is the front. The inner mold 2, used as the folding and forming reference, is detachably mounted on this front by bolts. The bolts are M8×20 stainless steel bolts, which facilitates the replacement of the inner mold 2 of the corresponding size according to the forming requirements of different specifications of packaging bags. On the tabletop 12 and the load-bearing plate 13, a bottom pressure plate 3, a first side push plate 4, a top push plate 5, a third side push plate 6, a second side push plate 7, and a folding and bonding component 8 are also arranged in coordination. Each push plate is moved by a corresponding drive structure. In conjunction with the glue application function of the folding and bonding component 8, the folding and bonding of the packaging paper is completed in an integrated operation, ultimately forming a cylindrical packaging bag body. It should be noted that the bottom pressure plate 3, the first side push plate 4, the top push plate 5, the third side push plate 6, and the second side push plate 7 are all made of 6061 aluminum alloy with a thickness of 5mm. This reduces the weight of the components and lowers the load on the drive components while ensuring structural strength.

[0014] The bottom pressure plate 3 is used to initially push the packaging paper to adhere to the bottom surface of the inner mold 2. Its driving and installation structure is as follows: A first electric telescopic component 31 is fixedly installed at the bottom of the tabletop 12. The first electric telescopic component 31 is preferably an electric push rod with its telescopic end facing vertically upward and able to extend through a pre-set through hole on the tabletop 12 to the top surface of the tabletop 12. The bottom surface of the bottom pressure plate 3 is fixedly connected to the telescopic end of the first electric telescopic component 31, and the bottom pressure plate 3 is positioned directly below the inner mold 2 to ensure that the packaging paper can be accurately pushed when the telescopic end extends.

[0015] A storage slot 32 is provided on the top surface of the table 12 at a position corresponding to the bottom pressure plate 3. The length and width of the storage slot 32 are perfectly matched with the dimensions of the bottom pressure plate 3. When the first electric telescopic component 31 retracts, the bottom pressure plate 3 can be completely embedded in the storage slot 32, preventing the top surface of the table 12 from protruding and affecting the initial placement of the packaging paper.

[0016] The first side push plate 4 is used to push the right side of the packaging paper upward and fit it against the right side of the inner mold 2. It has the functions of vertical movement and horizontal movement along the longer side of the table 12. The specific structure is as follows: A second electric telescopic component 41 (preferably an electric push rod) is provided at the bottom of the tabletop 12. Its telescopic end faces vertically upward and can pass through the first strip hole 42 opened on the right side of the tabletop 12 to extend out of the top surface of the tabletop 12. The bottom surface of the first side push plate 4 is fixedly connected to the telescopic end of the second electric telescopic component 41, and the first side push plate 4 is located on the right side of the inner mold 2. Vertical movement is achieved by the telescopic movement of the second electric telescopic component 41 to complete the folding and pushing.

[0017] The first strip hole 42 extends along the shorter side of the table 12, providing space for the vertical movement of the first side push plate 4. A first motor 43 is fixedly installed on the support leg 11, and the output end of the first motor 43 is connected to the first drive shaft 44. The first drive shaft 44 is a threaded rod, and its axis is parallel to the length direction of the longer side of the table 12. A first moving block 45 is threaded around the outer circumference of the first drive shaft 44. At the same time, a first limiting rod 46 (plain round rod) parallel to the first drive shaft 44 is fixedly installed on the support leg 11. The first moving block 45 is slidably connected to the first limiting rod 46 to prevent the first moving block 45 from rotating with the first drive shaft 44. The fixed end of the second electric telescopic component 41 is fixedly connected to the top surface of the first moving block 45. When the first motor 43 drives the first drive shaft 44 to rotate, the first moving block 45 moves horizontally along the first limiting rod 46, causing the second electric telescopic component 41 and the first side push plate 4 to slide along the longer side of the table 12, adapting to the folding requirements of different lengths of packaging paper.

[0018] The push plate 5 is used to push the upper part of the packaging paper to the left and fit it against the top surface of the inner mold 2. It has vertical and horizontal movement functions, and its structure is as follows: A third electric telescopic component 51 (electric push rod) is fixedly installed at the bottom of the tabletop 12. Its telescopic end is vertically upward and can extend through the top surface of the tabletop 12. The push plate 5 is connected to the telescopic end of the third electric telescopic component 51, and the push plate 5 is located to the right of the first side push plate 4. The vertical lifting and lowering is achieved by the extension and retraction of the third electric telescopic component 51 to ensure that it can contact the upper part of the packaging paper.

[0019] An electric slide rail 52 is fixedly installed at the telescopic end of the third electric telescopic component 51. The length direction of the electric slide rail 52 is consistent with the longer side of the table 12, and the end of the electric slide rail 52 near the inner mold 2 is fixed to the telescopic end. An electric slider 53 is slidably set on the electric slide rail 52, and the push plate 5 is fixedly connected to the electric slider 53. When the third electric telescopic component 51 raises the push plate 5 to the specified height, the electric slider 53 moves to the left along the electric slide rail 52, driving the push plate 5 to push the packaging paper and complete the leftward fold.

[0020] The third side push plate 6 is used to push the left side of the packaging paper downwards and fit it against the left side of the inner mold 2. It has vertical and horizontal movement functions, and its structure is as follows: A fourth electric telescopic component 61 (electric push rod) is fixedly installed on the front of the force plate 13, with its telescopic end facing the inner mold 2 (vertically downward). The third side push plate 6 is fixedly connected to the telescopic end of the fourth electric telescopic component 61, and the third side push plate 6 is located above the inner mold 2. Vertical movement is achieved by the telescopic movement of the fourth electric telescopic component 61, pushing the left side of the packaging paper downward.

[0021] A second motor 62 is fixedly installed on the front of the force-bearing plate 13. The output end of the second motor 62 is connected to a second transmission shaft 63 (threaded rod), whose axis is parallel to the length of the longer side of the table 12. A second moving block 64 is threaded around the outer circumference of the second transmission shaft 63. At the same time, a second limiting rod 65 (smooth round rod) parallel to the second transmission shaft 63 is fixedly installed on the front of the force-bearing plate 13. The second moving block 64 is slidably connected to the second limiting rod 65. The fixed end of the fourth electric telescopic component 61 is fixedly connected to the bottom surface of the second moving block 64. When the second motor 62 drives the second transmission shaft 63 to rotate, the second moving block 64 moves horizontally along the second limiting rod 65, causing the fourth electric telescopic component 61 and the third side push plate 6 to slide along the longer side of the table 12 to accommodate different lengths of packaging paper.

[0022] The second side pusher plate 7 is used to push the remaining left side portion of the packaging paper upwards and to make the adhesive end face adhere to the corresponding bonding surface. Its structure is similar to that of the first side pusher plate 4. A fifth electric telescopic component 71 (electric push rod) is provided at the bottom of the table 12. Its telescopic end is vertically upward and can pass through the second strip hole 72 opened on the left side of the table 12 to extend out of the top surface of the table 12. The bottom surface of the second side push plate 7 is fixedly connected to the telescopic end of the fifth electric telescopic component 71, and the second side push plate 7 is located on the left side of the inner mold 2. Vertical folding and pushing is achieved by telescopicing the fifth electric telescopic component 71.

[0023] It should be noted that each electric linear actuator is a miniature electric linear actuator of model DTZ300, with a rated thrust of 300N and a stroke range of 50mm-200mm, which meets the moving thrust and stroke requirements of each push plate.

[0024] The second strip hole 72 extends along the shorter side of the table 12; a third motor 73 is fixedly installed on the support leg 11, and its output end is connected to the third drive shaft 74 (threaded rod), with its axis parallel to the longer side of the table 12; a third moving block 75 is threaded around the outer circumference of the third drive shaft 74, and a third limiting rod 76 (smooth round rod) parallel to the third drive shaft 74 is also fixedly installed on the support leg 11, and the third moving block 75 is slidably connected to the third limiting rod 76; the fixed end of the fifth electric telescopic component 71 is fixedly connected to the top surface of the third moving block 75. When the third motor 73 drives the third drive shaft 74 to rotate, the third moving block 75 drives the fifth electric telescopic component 71 and the second side push plate 7 to slide along the longer side of the table 12, adapting to different lengths of packaging paper.

[0025] The edge-folding and bonding component 8 is installed on the table 12 on the left side of the inner mold 2. It is preferably an automatic glue gun, with its glue-dispensing end facing the end face of the packaging paper to be glued (i.e., the left end face of the packaging paper that is not in contact with the bottom surface of the inner mold 2). After the third side push plate 6 completes the downward folding, the glue is automatically adhered to this end face, preparing for the subsequent bonding operation of the second side push plate 7.

[0026] Working principle: Initial preparation: Control the retraction of each electric telescopic component so that the bottom pressure plate 3 is embedded in the storage slot 32, and the first side push plate 4, the top push plate 5, the third side push plate 6, and the second side push plate 7 are all in the initial low position or initial position; lay the strip of packaging paper flat on the table 12, ensuring that the inner side of the packaging paper is facing up and one end is aligned with the glue outlet end of the folded edge adhesive component 8.

[0027] Bottom pressure plate 3 pushes: Activate the first electric telescopic component 31, its telescopic end extends upward, driving the bottom pressure plate 3 to push the part of the packaging paper that is in contact with the bottom pressure plate 3 until this part is completely in contact with the bottom surface of the inner mold 2. At this time, the part of the packaging paper that is not in contact with the bottom pressure plate 3 is slightly raised.

[0028] First side push plate 4 folds the edge: Activate the second electric telescopic component 41, the telescopic end extends upward, driving the first side push plate 4 to push the right side part of the packaging paper that is not in contact with the bottom surface of the inner mold 2. At the same time, according to the length of the packaging paper, activate the first motor 43, drive the first moving block 45 to drive the first side push plate 4 to slide along the longer side of the table 12, ensuring that the right side part of the packaging paper is completely folded upward and fits against the right side surface of the inner mold 2.

[0029] Folding the top plate 5: Activate the third electric telescopic component 51, extend the telescopic end upward, and raise the top plate 5 to the height of the upper part of the packaging paper; then activate the electric slide rail 52, and the electric slider 53 drives the top plate 5 to move to the left, pushing the upper part of the packaging paper to fold to the left until it is in contact with the top surface of the inner mold 2.

[0030] The third side push plate 6 folds the edge: the fourth electric telescopic component 61 is activated, the telescopic end extends downward, and the third side push plate 6 pushes the left side part of the packaging paper downward to fold the edge. At the same time, the second motor 62 is activated, driving the second moving block 64 to drive the third side push plate 6 to slide along the longer side of the table 12 to ensure that the left side part of the packaging paper is in contact with the left side of the inner mold 2.

[0031] Adhesive application and bonding with the second side push plate 7: Activate the folding and bonding component 8 to adhere the adhesive to the left end face of the packaging paper that is not in contact with the bottom surface of the inner mold 2; then activate the fifth electric telescopic component 71, with the telescopic end extending upward, driving the second side push plate 7 to push the left end face upward for folding; at the same time, activate the third motor 73 to drive the third moving block 75 to slide the second side push plate 7, so that the adhesive end face of the packaging paper is adhered and fixed to the other end face that is in contact with the left side of the inner mold 2, finally forming a cylindrical packaging bag body.

[0032] Reset and unloading: After bonding is completed, each electric telescopic component retracts, each push plate returns to its initial position, and the operator or automated mechanism removes the formed packaging bag body, and the equipment enters the next processing cycle.

[0033] In this embodiment, all electric telescopic components, motors, and electric slide rails are automatically controlled by a PLC control system. Operators can preset operating parameters according to the packaging paper specifications, thereby further improving the production efficiency and ease of operation of the equipment.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A packaging bag edge-sealing device, comprising a worktable consisting of a support leg (11), a table (12) fixed to the top of the support leg (11), and a force-bearing plate (13) fixed to the longer side of the table (12), characterized in that: The front of the force plate (13) is the side of the operation area facing the table (12). The front of the force plate (13) is provided with an inner mold (2). The table (12) is provided with a bottom pressure plate (3), a first side push plate (4), a top push plate (5), and a third side push plate (6) that can be moved vertically. The third side push plate (6) can also be moved horizontally along the longer side length of the table (12). The front of the force plate (13) is provided with a second side push plate (7) that can be moved vertically. The table (12) is also provided with a folding and bonding component (8). The folding and bonding component (8) is used to adhere glue to one end of the packaging bag. The bottom pressure plate (3), the first side push plate (4), the top push plate (5), the third side push plate (6), and the second side push plate (7) are used together to shape the four edges of the packaging paper. When the two ends of the paper material are glued together, a cylindrical packaging bag body is formed.

2. The packaging bag edge-sealing device according to claim 1, characterized in that: The bottom of the tabletop (12) is fixedly provided with a first electric telescopic component (31), the telescopic end of the first electric telescopic component (31) faces upward and can extend through the top surface of the tabletop (12), the bottom pressure plate (3) is fixedly connected to the telescopic end of the first electric telescopic component (31), and the bottom pressure plate (3) is located below the inner mold (2); the top surface of the tabletop (12) is provided with a storage groove (32), the size of the storage groove (32) matches the size of the bottom pressure plate (3).

3. The packaging bag edge-sealing device according to claim 1, characterized in that: The bottom of the tabletop (12) is also provided with a second electric telescopic component (41). The telescopic end of the second electric telescopic component (41) faces upward and can extend through the top surface of the tabletop (12). The first side push plate (4) is fixedly connected to the telescopic end of the second electric telescopic component (41). The first side push plate (4) is located on the right side of the inner mold (2). The right side of the tabletop (12) is provided with a first strip hole (42). The first strip hole (42) extends along the shorter side of the tabletop (12). The support leg (11) is fixedly provided with a first motor (43). The output end of the first motor (43) is connected to a part that is longer than the longer side of the tabletop (12). A first drive shaft (44) parallel to the direction of the degree is provided. The first drive shaft (44) is a threaded rod, and a first moving block (45) is threadedly connected to its outer circumference. A first limiting rod (46) parallel to the axial direction of the first drive shaft (44) is also fixed on the support leg (11). The first limiting rod (46) is a smooth round rod. The first moving block (45) is slidably connected to the outer circumference of the first limiting rod (46). The fixed end of the second electric telescopic component (41) is fixedly connected to the top surface of the first moving block (45). The first side push plate (4) is horizontally slidably disposed in the first strip hole (42) along the longer side length direction of the platform (12).

4. The packaging bag edge-sealing device according to claim 1, characterized in that: The bottom of the table (12) is also fixedly provided with a third electric telescopic component (51). The telescopic end of the third electric telescopic component (51) faces upward and can extend through the top surface of the table (12). The push plate (5) is connected to the telescopic end of the third electric telescopic component (51). The push plate (5) is located on the right side of the first side push plate (4). The telescopic end of the third electric telescopic component (51) is fixedly provided with an electric slide rail (52). The telescopic end of the third electric telescopic component (51) is fixedly connected to the end of the electric slide rail (52) near the inner mold (2). An electric slider (53) is slidably connected on the electric slide rail (52) along the longer side length of the table (12). The push plate (5) is connected to the electric slider (53).

5. The packaging bag edge-sealing device according to claim 1, characterized in that: The front of the force plate (13) is provided with a fourth electric telescopic component (61), the telescopic end of the fourth electric telescopic component (61) faces the inner mold (2), the third side push plate (6) is fixedly connected to the telescopic end of the fourth electric telescopic component (61), and the third side push plate (6) is located above the inner mold (2); the front of the force plate (13) is fixedly provided with a second motor (62), the output end of the second motor (62) is connected to a second transmission shaft (63) parallel to the length direction of the longer side of the table (12), the second transmission shaft (63) is a threaded rod, and a second moving block (64) is threadedly connected to its outer circumference; the front of the force plate (13) is also fixedly provided with a second limiting rod (65), the second limiting rod (65) is a smooth round rod, the second moving block (64) is slidably connected to the outer circumference of the second limiting rod (65), and the fixed end of the fourth electric telescopic component (61) is fixedly connected to the bottom surface of the second moving block (64).

6. The packaging bag edge-sealing device according to claim 1, characterized in that: The bottom of the platform (12) is also provided with a fifth electric telescopic component (71). The telescopic end of the fifth electric telescopic component (71) faces upward and can extend through the top surface of the platform (12). The second side push plate (7) is fixedly connected to the telescopic end of the fifth electric telescopic component (71). The second side push plate (7) is located on the left side of the inner mold (2). The left side of the platform (12) is provided with a second strip hole (72). The second strip hole (72) extends along the shorter side of the platform (12). The support leg (11) is also fixedly provided with a third motor (73). The output end of the third motor (73) is connected to the longer side of the platform (12). A third drive shaft (74) parallel to the length direction is a threaded rod with a third moving block (75) threaded to its outer circumference. A third limiting rod (76) parallel to the axial direction of the third drive shaft (74) is also fixed on the support leg (11). The third limiting rod (76) is a smooth round rod. The third moving block (75) is slidably connected to the outer circumference of the third limiting rod (76). The fixed end of the fifth electric telescopic component (71) is fixedly connected to the top surface of the third moving block (75). The second side push plate (7) is horizontally slidably disposed in the second strip hole (72) along the longer side length direction of the platform (12).

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