Dry type compound machine convenient to clean, disassemble and assemble and used for plastic bag production

Abstract

The utility model relates to the technical field of plastic bag production, and provides a plastic bag production dry type compound machine convenient to clean, disassemble and assemble, the plastic bag production dry type compound machine comprises an upper machine body and a lower machine body, the upper machine body is movably connected with the lower machine body, and a plurality of upper transmission cylinders are installed in the upper machine body; the upper transmission cylinders are connected with an upper transmission motor, a pressing plate is arranged in the portion, between the upper transmission cylinders, of the upper machine body, a plurality of connecting blocks are installed on the top of the upper machine body, the tops of the connecting blocks are connected with the telescopic end of a lifting air cylinder, the fixed end of the lifting air cylinder is connected with the bottom of a movable plate, and the top of the movable plate is connected with a plurality of sliding blocks. The sliding block is slidably connected with a movable sliding rail, and the two ends of the movable sliding rail are connected with the top of the first supporting plate and the top of the second supporting plate correspondingly. The technical problem that in the prior art, an operator cannot conveniently clean the interior of a machine is solved.

Description

A dry laminating machine for plastic bag production that is easy to clean and disassemble Technical Field

[0001] The embodiments disclosed herein relate to the field of plastic bag production technology, and more specifically, to a dry laminating machine for plastic bag production that is easy to clean and disassemble. Background Technology

[0002] A dry laminating machine is a machine that uses a dry lamination process to bond different plastic films together to form a composite film. The dry lamination process involves applying adhesive, then heating and venting the solvent in the adhesive solution to allow it to dry completely before lamination. Nowadays, the production of plastic bags is increasing, and the types and quantities of plastics required are also growing rapidly. Therefore, dry laminating machines are needed for the plastic coating and drying process. These machines have a relatively large daily output, and based on the working principle of plastic bag production, drying is necessary to ensure the adhesive is completely dry.

[0003] However, in modern dry laminating machines used for plastic bag production, the plastic bags need to be compacted before the adhesive between them dries to ensure a stronger bond. However, the compaction devices on existing dry laminating machines are usually fixed in place. During the compaction process, excess adhesive is squeezed out and remains on the compaction device. Over time, this residue forms clumps on the device, easily combining with dust in the air, making the device dirty and difficult to clean, thus affecting the quality of the processed plastic bags.

[0004] Therefore, it is necessary to provide a dry laminating machine for plastic bag production that is easy to clean and disassemble to solve the above-mentioned technical problems. Summary of the Invention

[0005] To overcome the above-mentioned defects, the embodiments of this disclosure provide a dry laminating machine for plastic bag production that is easy to clean and disassemble, solving the technical problem in the prior art that it is inconvenient for operators to clean the inside of the machine.

[0006] According to one aspect, at least one embodiment of this disclosure provides a dry laminating machine for producing plastic bags that is easy to clean and disassemble, including an upper body and a lower body. The bottom of the upper body is movably connected to the top of the lower body. Multiple upper transmission cylinders are installed inside the upper body. Each upper transmission cylinder is connected to the drive end of an upper transmission motor via a transmission mechanism. A pressure plate is provided inside the upper body between the upper transmission cylinders. The top of the pressure plate is connected to the telescopic end of a pressure cylinder. The fixed end of the pressure cylinder is connected to the top of the upper body. Multiple lower transmission cylinders are installed inside the lower body. Each lower transmission cylinder is connected to the drive end of a lower transmission motor via a transmission mechanism. A pressure plate is installed inside the upper body between the lower transmission cylinders. Multiple electric heating plates are installed on the inner side of the upper body. The top of the upper body is connected to the telescopic ends of multiple lifting cylinders. The fixed end of the lifting cylinder is connected to the bottom of the moving plate. Multiple sliders are connected to the top of the moving plate. The sliders are slidably connected to the moving slide rail. The two ends of the moving slide rail are respectively connected to the top of the first support plate and the top of the second support plate. The bottom of the upper body is provided with a first upper notch and a second upper notch at both ends. One end of the top of the lower body is provided with a first lower notch that mates with the first upper notch. The other end of the top of the lower body is provided with a second lower notch that mates with the second upper notch.

[0007] For example, in at least one embodiment of this disclosure, a dry laminating machine for producing plastic bags that is easy to clean and disassemble is provided, which further includes: a plurality of exhaust holes are provided on the top of the upper body, and the exhaust holes are connected to an exhaust pipe through a solenoid valve.

[0008] For example, in at least one embodiment of this disclosure, a dry laminating machine for producing plastic bags that is easy to clean and disassemble is provided, which further includes: a connecting ring at the bottom of the upper body and a connecting groove that mates with the connecting ring at the top of the lower body.

[0009] Preferably, the bottom of the upper body on the outer side of the connecting ring is provided with multiple fixing holes, and the top of the lower body is provided with a fixing shaft that mates with the connecting holes.

[0010] For example, in at least one embodiment of this disclosure, a dry laminating machine for producing plastic bags that is easy to clean and disassemble is provided, which further includes: the first support plate and the second support plate are U-shaped, the bottom of the first support plate is connected to the top of the first fixed seat, and the bottom of the second support plate is connected to the top of the second fixed seat.

[0011] For example, in a dry laminating machine for producing plastic bags that is easy to clean and disassemble, provided in at least one embodiment of this disclosure, the machine further includes: a plurality of pressure cylinders, which are linearly and equidistantly fixed at the top of the upper body.

[0012] For example, in a dry laminating machine for producing plastic bags that is easy to clean and disassemble, provided in at least one embodiment of this disclosure, the machine further includes: all sides of the pressure plate are provided with guide blocks, the guide blocks are slidably connected to guide grooves, and the guide grooves are provided on the inner side of the upper body.

[0013] For example, in a dry laminating machine for producing plastic bags that is easy to clean and disassemble, provided in at least one embodiment of this disclosure, the machine further includes: a first baffle groove and a second baffle groove respectively provided on the top of the first upper notch and the second upper notch, and the first baffle groove and the second baffle groove are slidably connected to the first baffle and the second baffle respectively.

[0014] For example, in a dry laminating machine for producing plastic bags that is easy to clean and disassemble, provided in at least one embodiment of this disclosure, the machine further includes: the top of the first baffle is connected to the telescopic end of the first cylinder, the top of the second baffle is connected to the telescopic end of the second cylinder, and the fixed ends of the first cylinder and the second cylinder are installed at both ends of the top of the upper body.

[0015] For example, in at least one embodiment of this disclosure, a dry laminating machine for producing plastic bags that is easy to clean and disassemble is provided, which further includes: a first positioning block and a second positioning block are provided on opposite sides of the upper body, the first positioning block and the second positioning block are respectively slidably connected to a first positioning groove and a second positioning groove, the first positioning groove and the second positioning groove are respectively provided on the sides of a first positioning plate and a second positioning plate, and the bottoms of the first positioning plate and the second positioning plate are respectively connected to the two outer sides of the lower body.

[0016] The beneficial effects of the embodiments disclosed herein are as follows:

[0017] In this disclosure, the upper and lower bodies are separated by the movement of the slide rail and the lifting cylinder, and the upper body is moved to one side of the lower body, so that the bottom of the upper body and the top of the lower body are exposed, making it easier for operators to clean the inside. This prevents the glue from being squeezed out and excess glue from being squeezed out and remaining on the pressure plate and bearing plate. After long-term use, it will form clumps on the pressure plate and bearing plate, which can easily combine with dust in the air, making the pressure plate and bearing plate dirty and difficult to clean, thus affecting the quality of the processed plastic bags.

[0018] In this disclosure, by setting a connecting ring and a connecting groove, when the upper body and the lower body are connected, the connecting ring enters the inner side of the connecting groove, which improves the sealing of the connection while connecting. Furthermore, by setting a fixing hole and a fixing shaft, the stability and convenience of connecting the upper body and the lower body are improved through the mutual connection between the two.

[0019] In this disclosure, by setting up a liftable first baffle and a second baffle, when the plastic film passes through the inlet formed by the first upper notch and the first lower notch, and the outlet formed by the second upper notch and the second lower notch, the downward movement of the first baffle and the second baffle can seal the inlet and outlet without affecting the movement of the plastic film, preventing heat exchange with the outside through the inlet and outlet, and improving the heating efficiency of the electric heating plate. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0021] Figure 1 is a schematic diagram of a preferred embodiment of a dry laminating machine for producing plastic bags that is easy to clean and disassemble, provided by this utility model;

[0022] Figure 2 is a schematic diagram of the upper body shown in Figure 1;

[0023] Figure 3 is a structural schematic diagram of the upper body shown in Figure 1 from a lower view.

[0024] Figure 4 is a schematic diagram of the internal structure of the upper body shown in Figure 1;

[0025] Figure 5 is a structural schematic diagram of the lower body shown in Figure 1;

[0026] Labels in the diagram: 1. Lower body; 2. Upper body; 3. Lifting cylinder; 4. Moving plate; 5. Sliding block; 6. Moving slide rail; 7. First support plate; 8. First fixed seat; 9. Second support plate; 10. Second fixed seat; 11. Exhaust pipe; 12. Solenoid valve; 13. Exhaust port; 14. First upper notch; 15. First baffle; 16. First cylinder; 17. Connecting ring; 18. First positioning block; 19. Second upper notch; 20. Second baffle ; 21. Second cylinder; 22. Fixing hole; 23. Upper transmission cylinder; 24. Pressure plate; 25. Guide groove; 26. Second positioning block; 27. Pressure cylinder; 28. Electric heating plate; 29. ​​Guide block; 30. First lower notch; 31. Second lower notch; 32. Lower transmission cylinder; 33. Pressure plate; 34. Connecting groove; 35. Fixing shaft; 36. First positioning plate; 37. First positioning groove; 38. Second positioning plate; 39. Second positioning groove. Detailed Implementation

[0027] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0028] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0029] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0030] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0032] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] As shown in Figures 1-5, a dry laminating machine for producing plastic bags that is easy to clean and disassemble is illustrated in one embodiment of this disclosure. It includes an upper body 2 and a lower body 1. The bottom of the upper body 2 is movably connected to the top of the lower body 1. Multiple upper transmission cylinders 23 are installed inside the upper body 2. Each upper transmission cylinder 23 is connected to the drive end of an upper transmission motor via a transmission mechanism. A pressure plate 24 is provided inside the upper body 2 between the upper transmission cylinders 23. The top of the pressure plate 24 is connected to the telescopic end of a pressure cylinder 27. The fixed end of the pressure cylinder 27 is connected to the top of the upper body 2. Multiple lower transmission cylinders 32 are installed inside the lower body 1. Each lower transmission cylinder 32 is connected to the drive end of a lower transmission motor via a transmission mechanism. A pressure plate 33 is installed inside the upper body 2 between the transmission cylinders 32. Multiple electric heating plates 28 are installed on the inner side of the upper body 2. The top of the upper body 2 is connected to the telescopic ends of multiple lifting cylinders 3. The fixed end of the lifting cylinder 3 is connected to the bottom of the moving plate 4. Multiple sliders 5 are connected to the top of the moving plate 4. The sliders 5 are slidably connected to the moving slide rail 6. The two ends of the moving slide rail 6 are respectively connected to the top of the first support plate 7 and the second support plate 9. The two ends of the bottom of the upper body 2 are respectively provided with a first upper notch 14 and a second upper notch 19. One end of the top of the lower body 1 is provided with a first lower notch 30 that cooperates with the first upper notch 14. The other end of the top of the lower body 1 is provided with a second lower notch 31 that cooperates with the second upper notch 19.

[0034] In some examples, as shown in Figures 1 and 2, the top of the upper body 2 is provided with a plurality of exhaust holes 13, which are connected to the exhaust pipe 11 via a solenoid valve 12.

[0035] It should be noted that: driven by the sliding rail 6, the moving plate 4 connected to the lifting cylinder 3 can move back and forth, and cooperate with the lifting cylinder 3 which can move the upper body 2 up and down, and finally realize the up and down and back and forth movement of the upper body 2.

[0036] Before use, the plastic film (bag) with glue can be placed above the lower transmission cylinder 32 and the pressure plate 33. Then, the upper body 2 is moved downward through the lifting cylinder 3 and the moving slide rail 6 to connect with the lower body 1, forming a boxed dry laminating machine. Then, the extension and retraction of the pressure cylinder 27 drives the pressure plate 24 to move downward, applying pressure to the top of the plastic bag and compacting the plastic bags to make the glue stick more firmly. Then, the electric heating plate is activated, and the heat dissipation of the electric heating plate can increase the temperature inside the box, so that the glue between the plastic bags can be fully dried by heating. During the drying process, the solenoid valve 12 is opened at regular intervals to discharge the gas generated by drying the glue.

[0037] Once a section of plastic film (bag) has been heated and dried, it can be driven by the upper transmission cylinder 23 and the lower transmission cylinder 32 to enter the dry laminating machine for drying.

[0038] After a period of operation, the upper body 2 and the lower body 1 can be separated by the sliding rail 6 and the lifting cylinder 3. The upper body 2 is then moved to one side of the lower body 1, exposing the bottom of the upper body 2 and the top of the lower body 1. This facilitates cleaning of the interior by the operator and prevents the glue from being squeezed out. Excess glue is squeezed out and remains on the pressure plate 24 and the bearing plate 33. After prolonged use, clumps will form on the pressure plate 24 and the bearing plate 33, which easily combine with dust in the air, causing the pressure plate 24 and the bearing plate 33 to become dirty and difficult to clean, thus affecting the quality of the processed plastic bags.

[0039] In some examples, referring to Figures 3 and 5, the bottom of the upper body 2 is provided with a connecting ring 17, and the top of the lower body 1 is provided with a connecting groove 34 that mates with the connecting ring 17.

[0040] In some examples, referring to Figure 1, the bottom of the upper body 2 on the outer side of the connecting ring 17 is provided with a plurality of fixing holes 22, and the top of the lower body 1 is provided with a fixing shaft 35 that mates with the connecting holes.

[0041] It should be noted that by setting the connecting ring 17 and the connecting groove 34, when the upper body 2 and the lower body 1 are connected, the connecting ring 17 enters the inner side of the connecting groove 34, which improves the sealing of the connection while connecting. Furthermore, by setting the fixing hole 22 and the fixing shaft 35, the stability and convenience of the connection between the upper body 2 and the lower body 1 are improved through the mutual connection between the two.

[0042] In some examples, referring to Figure 1, the first support plate 7 and the second support plate 9 are U-shaped, with the bottom of the first support plate 7 connected to the top of the first fixing seat 8 and the bottom of the second support plate 9 connected to the top of the second fixing seat 10.

[0043] It should be noted that by setting the first fixed seat 8 and the second fixed seat 10, the bottom of the first support plate 7 and the second support plate 9 can be fixed, thereby improving the stability of the first support plate 7 and the second support plate 9 when they are placed, and thus improving the stability of the moving slide rail 6 when it moves on the upper body 2.

[0044] In some examples, referring to Figure 4, there are multiple pressure cylinders 27, which are linearly and equidistantly fixed at the top of the upper body 2.

[0045] It should be noted that by setting multiple pressure cylinders 27, the top of the pressure plate 24 is subjected to uniform force, thereby improving the stability of the pressure plate 24 when it moves up and down.

[0046] In some examples, referring to Figure 4, all sides of the pressure plate 24 are provided with guide blocks 29, which are slidably connected to guide grooves 25, which are provided on the inner side of the upper body 2.

[0047] It should be noted that by setting the guide block 29, the stability of the pressure plate 24 when moving up and down can be further improved by the limiting guidance of the guide groove 25.

[0048] In some examples, referring to Figures 2 and 3, the top of the first upper notch 14 and the second upper notch 19 are respectively provided with a first baffle 15 groove and a second baffle 20 groove, and the first baffle 15 groove and the second baffle 20 groove are slidably connected to the first baffle 15 and the second baffle 20 respectively.

[0049] In some examples, referring to Figures 2 and 3, the top of the first baffle 15 is connected to the telescopic end of the first cylinder 16, and the top of the second baffle 20 is connected to the telescopic end of the second cylinder 21. The fixed ends of the first cylinder 16 and the second cylinder 21 are installed at both ends of the top of the upper body 2.

[0050] It should be noted that by setting up the liftable first baffle 15 and second baffle 20, when the plastic film (bag) passes through the inlet formed by the first upper notch 14 and the first lower notch 30, and the outlet formed by the second upper notch 19 and the second lower notch 31, the downward movement of the first baffle 15 and the second baffle 20 can seal the inlet and outlet without affecting the movement of the plastic film (bag), preventing heat exchange with the outside through the inlet and outlet, and improving the heating efficiency of the electric heating plate 28.

[0051] In some examples, referring to Figure 5, the upper body 2 has a first positioning block 18 and a second positioning block 26 on opposite sides. The first positioning block 18 and the second positioning block 26 are slidably connected to the first positioning groove 37 and the second positioning groove 39, respectively. The first positioning groove 37 and the second positioning groove 39 are respectively disposed on the sides of the first positioning plate 36 and the second positioning plate 38. The bottoms of the first positioning plate 36 and the second positioning plate 38 are respectively connected to the two outer sides of the lower body 1.

[0052] It should be noted that by setting the first positioning block 18 and the second positioning block 26, when the upper body 2 moves up and down, the first positioning groove 37 and the second positioning groove 39 restrict the positioning, preventing the upper body 2 from being misaligned and affecting the connection with the lower body 1.

[0053] The working principle of the dry laminating machine for producing plastic bags, which is easy to clean and disassemble, provided by this utility model, is as follows:

[0054] Driven by the sliding rail 6 and the lifting cylinder 3, the upper body 2 and the lower body 1 are separated, and the upper body 2 is moved to one side of the lower body 1, so that the bottom of the upper body 2 and the top of the lower body 1 are exposed, making it easier for operators to clean the inside. This prevents the glue from being squeezed out and excess glue from being squeezed out and remaining on the pressure plate 24 and the bearing plate 33. After long-term use, it will form clumps on the pressure plate 24 and the bearing plate 33, which are easy to combine with dust in the air, causing the pressure plate 24 and the bearing plate 33 to become dirty and difficult to clean, which will affect the quality of the processed plastic bags.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure 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 disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A dry laminating machine for producing plastic bags that is easy to clean and disassemble, characterized in that, include: The upper body (2) and the lower body (1) are connected. The bottom of the upper body (2) is movably connected to the top of the lower body (1). Multiple upper transmission cylinders (23) are installed inside the upper body (2). The upper transmission cylinders (23) are connected to the drive end of the upper transmission motor through a transmission mechanism. A pressure plate (24) is provided inside the upper body (2) between the upper transmission cylinders (23). The top of the pressure plate (24) is connected to the telescopic end of the pressure cylinder (27). The fixed end of the pressure cylinder (27) is connected to the top of the upper body (2). Multiple lower transmission cylinders (32) are installed inside the lower body (1). The lower transmission cylinders (32) are connected to the drive end of the lower transmission motor through a transmission mechanism. A pressure plate (33) is installed inside the upper body (2) between the lower transmission cylinders (32). Multiple electric heating plates (28) are installed on the inner side of the upper body (2). The top of the upper body (2) is connected to the telescopic ends of multiple lifting cylinders (3). The fixed end of the lifting cylinder (3) is connected to the bottom of the moving plate (4). Multiple sliders (5) are connected to the top of the moving plate (4). The sliders (5) are slidably connected to the moving slide rail (6). The two ends of the moving slide rail (6) are respectively connected to the top of the first support plate (7) and the second support plate (9). The two ends of the bottom of the upper body (2) are respectively provided with a first upper notch (14) and a second upper notch (19). One end of the top of the lower body (1) is provided with a first lower notch (30) that cooperates with the first upper notch (14). The other end of the top of the lower body (1) is provided with a second lower notch (31) that cooperates with the second upper notch (19).

2. The dry laminating machine for producing plastic bags that is easy to clean and disassemble, as described in claim 1, is characterized in that... The top of the upper body (2) is provided with multiple exhaust holes (13), and the exhaust holes (13) are connected to the exhaust pipe (11) through the solenoid valve (12).

3. The dry laminating machine for producing plastic bags that is easy to clean and disassemble, as described in claim 1, is characterized in that... The bottom of the upper body (2) is provided with a connecting ring (17), and the top of the lower body (1) is provided with a connecting groove (34) that cooperates with the connecting ring (17).

4. The plastic bag production dry compound machine of claim 3, wherein, The bottom of the upper body (2) on the outside of the connecting ring (17) is provided with multiple fixing holes (22), and the top of the lower body (1) is provided with a fixing shaft (35) that cooperates with the connecting holes.

5. The plastic bag production dry lamination machine of easy cleaning and disassembly according to claim 1, characterized in that, The first support plate (7) and the second support plate (9) are U-shaped. The bottom of the first support plate (7) is connected to the top of the first fixed seat (8), and the bottom of the second support plate (9) is connected to the top of the second fixed seat (10).

6. A dry laminating machine for producing plastic bags that is easy to clean and disassemble, as described in claim 1, is characterized in that... The number of pressure cylinders (27) is multiple, and the pressure cylinders (27) are linearly and equidistantly fixed at the top of the upper body (2).

7. A dry laminating machine for producing plastic bags that is easy to clean and disassemble, as described in claim 1, is characterized in that... All sides of the pressure plate (24) are provided with guide blocks (29), the guide blocks (29) are slidably connected to guide grooves (25), and the guide grooves (25) are provided on the inner side of the upper body (2).

8. The plastic bag production dry lamination machine of easy cleaning and disassembly according to claim 1, characterized in that, The top of the first upper notch (14) and the second upper notch (19) are respectively provided with a first baffle (15) groove and a second baffle (20) groove, and the first baffle (15) groove and the second baffle (20) groove are respectively slidably connected to the first baffle (15) and the second baffle (20).

9. A dry laminating machine for producing plastic bags that is easy to clean and disassemble, as described in claim 8, is characterized in that... The top of the first baffle (15) is connected to the telescopic end of the first cylinder (16), the top of the second baffle (20) is connected to the telescopic end of the second cylinder (21), and the fixed ends of the first cylinder (16) and the second cylinder (21) are installed at both ends of the top of the upper body (2).

10. A dry laminating machine for producing plastic bags that is easy to clean and disassemble, as described in claim 1, characterized in that, The upper body (2) has a first positioning block (18) and a second positioning block (26) on opposite sides. The first positioning block (18) and the second positioning block (26) are slidably connected to the first positioning groove (37) and the second positioning groove (39) respectively. The first positioning groove (37) and the second positioning groove (39) are respectively located on the sides of the first positioning plate (36) and the second positioning plate (38). The bottoms of the first positioning plate (36) and the second positioning plate (38) are respectively connected to the two outer sides of the lower body (1).

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