Glass fiber packing material and clamp for sewing glass fiber packing material

Abstract

The utility model relates to the field of packing material sewing equipment, in particular to a glass fiber packing material and a clamp for sewing the glass fiber packing material, the glass fiber packing material comprises a workbench and a clamp frame movably arranged on the workbench, a bearing cavity used for bearing lower-layer cloth, glass fiber cloth and lower-layer cloth is formed in the clamp frame, and clamping assemblies are arranged on the periphery of the bearing cavity. The clamping assembly comprises an upper pressing part and a lower supporting part which are distributed up and down, one side of the lower supporting part is integrally connected with the clamp frame, the other side of the lower supporting part horizontally extends into the bearing cavity, and the upper pressing part is rotatably installed on the clamp frame. Through cooperation of the clamp frame and the clamping assembly arranged on the clamp frame, multiple layers of fabric can be arranged in the bearing cavity of the clamp frame before being sewn, the lowest layer of fabric is turned upwards by the clamping assembly to cover the upper layer of fabric, and meanwhile, the multiple layers of fabric are clamped and fixed; therefore, the follow-up sewing work of the multi-layer fabric is facilitated, and the sewing efficiency is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of packaging material stitching equipment, and in particular, to a glass fiber packaging material and a fixture for stitching the same. Background Art

[0002] To meet the heat insulation requirements in some special scenarios, special, thicker and fluffier glass fiber cloths are needed. However, glass fiber cloths are prone to loosening and have poor waterproof performance. Therefore, it is necessary to use surface cloths with waterproof and oil-proof properties on both sides to cover the upper and lower sides of the glass fiber cloth, and stitch the two surface cloths and the glass fiber cloth into one body.

[0003] In the related art, when stitching the surface cloth and the glass fiber cloth, the stitching worker first stacks the two surface cloths and the glass fiber cloth layer by layer from top to bottom, then turns up the lower surface cloth to cover the upper surface cloth, and then stitches the peripheries of the upper surface cloth, the glass fiber cloth and the lower surface cloth.

[0004] The problem with the related art is that in the case of stitching with a large-sized surface cloth, it is inconvenient to operate manually. When stitching one section of the surface cloth, it is difficult to fix the position of the other part of the surface cloth, and the worker needs to frequently adjust the position of the surface cloth, so the stitching efficiency is low. Utility Model Content

[0005] In order to improve the stitching efficiency of the glass fiber packaging material, the present application provides a glass fiber packaging material and a stitching fixture therefor.

[0006] On the one hand, a glass fiber packaging material provided by the present application adopts the following technical solution:

[0007] A glass fiber packaging material, comprising an upper fabric, a glass fiber cloth and a lower fabric which are stacked up and down. The size of the upper fabric is the same as that of the glass fiber cloth, the size of the lower fabric is larger than that of the upper fabric, and the part of the lower fabric extending outside the upper fabric turns up to cover the periphery of the upper fabric. The upper fabric and the glass fiber cloth are stitched into one body with the turned-up part and the lower fabric, and positioning holes are reserved at corresponding positions of the upper fabric, the glass fiber cloth and the lower fabric.

[0008] By adopting the above technical solution, the glass fiber cloth has excellent heat insulation performance. Surface cloths with good waterproof and oil-proof properties are stitched on both sides of the glass fiber cloth, which can improve the overall protection performance of the packaging material. The setting of the positioning holes facilitates the positioning of each surface cloth during the stitching process of the packaging material.

[0009] On the other hand, a fixture for stitching a glass fiber packaging material provided by the present application adopts the following technical solution:

[0010] A fixture for stitching glass fiber packaging materials, comprising a workbench and a fixture frame movably arranged on the workbench. A bearing cavity for receiving the lower fabric, glass fiber cloth, and upper fabric is formed on the fixture frame. A clamping assembly is arranged around the bearing cavity for driving the lower fabric to turn over and clamping and fixing the lower fabric, glass fiber cloth, and upper fabric to be stitched. The clamping assembly includes an upper pressing part and a lower supporting part distributed up and down. One side of the lower supporting part is integrally connected to the fixture frame, and the other side horizontally extends into the bearing cavity. The upper pressing part is rotatably installed on the fixture frame.

[0011] By adopting the above technical solution, the fixture frame and the clamping assembly are cooperatively arranged. The lower fabric, glass fiber cloth, and upper fabric to be stitched are sequentially arranged up and down in the bearing cavity. The upper pressing part is turned over so that the upper pressing part and the lower supporting part respectively apply clamping forces to the lower fabric, glass fiber cloth, and upper fabric from the upper and lower sides, thereby fixing each layer of fabric in the fixture frame. Then, the fixture frame with the fixed fabric is transferred to the sewing equipment, which is convenient for workers to sew and effectively improves the sewing efficiency.

[0012] Optionally, the upper pressing part and the lower supporting part are respectively arranged as frame structures adapted to the bearing cavity. The upper pressing part includes several sections of frame plates connected end to end, and each section of the frame plates is respectively rotatably installed on the side edges of the fixture frame.

[0013] By adopting the above technical solution, setting the upper pressing part as a structure composed of multiple sections of frame plates can facilitate the staff to fix some side edges of each layer of fabric as needed.

[0014] Optionally, the clamping assembly further includes a plurality of magnetic adsorption blocks arranged on the upper pressing part and the lower supporting part and corresponding to each other up and down. The plurality of magnetic adsorption blocks arranged on the upper pressing part and the lower supporting part are respectively evenly distributed along the periphery of the bearing cavity.

[0015] By adopting the above technical solution, when the upper pressing part rotates to a position corresponding to the lower supporting part up and down, the magnetic adsorption blocks respectively arranged on the upper pressing part and the lower supporting part attract each other, thereby improving the clamping force of the clamping assembly on each layer of fabric.

[0016] Optionally, a positioning assembly is arranged on the workbench. The positioning assembly is arranged below the fixture frame and includes a lifting driver installed on the workbench. The lifting driver has a telescopic end extending vertically upward. The positioning assembly further includes a positioning rod fixed to the telescopic end of the lifting driver, and the positioning rod is adapted to a positioning hole.

[0017] By adopting the above technical solution, the lifting driver drives the positioning rod to move upward. When placing each layer of fabric in the bearing cavity, the positioning holes formed on each layer of fabric correspond to the positioning rod, and the positioning rod passes through the positioning holes, thereby realizing the fixation of the positions of each layer of fabric without the need for workers to repeatedly adjust the positions.

[0018] Optionally, an embedding groove is formed on the workbench, and the shape of the embedding groove is adapted to the fixture frame. The lower end of the fixture frame and the lower support part are both accommodated in the embedding groove, and the upper surface of the lower support part is flush with the upper surface of the workbench.

[0019] By adopting the above technical solution, the embedding groove can limit the horizontal position of the fixture frame, and the lower support part and the upper surface of the workbench can provide sufficient support for each layer of fabric placed in the bearing cavity, avoiding the middle part of the fabric from sagging downward.

[0020] Optionally, an indentation mechanism is provided on the workbench. The indentation mechanism includes several indentation plates, and each indentation plate corresponds to each periphery of the bearing cavity respectively. The indentation mechanism further includes a driving component for driving each indentation plate to rotate.

[0021] By adopting the above technical solution, the driving component drives the indentation plate to rotate, and the indentation plate can apply pressure to the lower layer of fabric placed in the bearing cavity towards the corners of the fixture frame and the lower support part, so that when the upper pressing part is flipped later, it can conveniently drive the lower layer of fabric to turn up, and at the same time, it can also play a certain role in shaping the fabric.

[0022] Optionally, mounting platforms extending vertically upward are provided around the workbench. The driving component is fixed on the mounting platforms and is provided with multiple groups. The multiple groups of driving components correspond to several indentation plates one by one. Each group of driving components includes a rotating shaft rotatably mounted on the mounting platform, a motor for driving the rotating shaft to rotate, and a transmission connecting piece connecting the rotating shaft and the indentation plate. The extending direction of the rotating shaft is the same as the length direction of the indentation plate.

[0023] By adopting the above technical solution, the motor drives the rotating shaft to rotate, and the rotating shaft drives the indentation plate to rotate through the transmission connecting piece, so that the indentation plate obtains a driving force and acts on the lower layer of fabric. After the indentation action is completed, the motor drives the indentation plate away from the fixture frame to avoid subsequent actions.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. By the cooperation of the fixture frame and the clamping assembly arranged on the fixture frame, before sewing multiple layers of fabric, the multiple layers of fabric can be placed in the bearing cavity of the fixture frame, and the clamping assembly turns the bottom layer of fabric upwards to cover the upper layer of fabric, while clamping and fixing the multiple layers of fabric, thus facilitating the subsequent sewing work of the multiple layers of fabric and effectively improving the sewing efficiency;

[0026] 2. Through the positioning assembly arranged on the workbench, the lifting driver drives the positioning rod to rise. When placing each layer of fabric in the bearing cavity, the positioning rod can pass through the positioning holes formed in each layer of fabric, so as to fix the placement positions of each layer of fabric, and the operation is simple and convenient;

[0027] 3. Through the setting of the indentation mechanism, after placing the lower fabric in the bearing cavity, the driving assembly drives the indentation plate to rotate towards the bearing cavity, so that one end of the indentation plate applies pressure to the lower fabric towards the corner of the bearing cavity to shape the lower fabric. When subsequently rotating the upper pressing part to fix each layer of fabric, the indentation formed on the lower fabric can facilitate the upper pressing part to drive it to turn upwards, and the shape of the multi-layer fabric after sewing can be more flat. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the composition structure of the fiberglass packaging material of this application.

[0029] Figure 2 It is a front sectional structure schematic diagram of a state of the sewing fixture of this application.

[0030] Figure 3 It is a top sectional structure schematic diagram of the sewing fixture of this application.

[0031] Figure 4 It is a front sectional structure schematic diagram of another state of the sewing fixture of this application.

[0032] Figure 5 It is Figure 4 The enlarged schematic diagram of the structure at A in

[0033] Reference Signs: 01, upper fabric; 02, fiberglass cloth; 03, lower fabric; 04, positioning hole; 1, workbench; 2, fixture frame; 3, clamping assembly; 31, upper pressing part; 311, frame plate; 32, lower support part; 33, magnetic adsorption block; 4, positioning assembly; 41, lifting driver; 42, positioning rod; 5, indentation mechanism; 51, indentation plate; 52, driving assembly; 521, rotating shaft; 522, motor; 523, transmission connecting piece; 6, mounting table. Detailed Description of the Invention

[0034] The following combines the attached Figures 1-5Further details of the present application will be described below.

[0035] An embodiment of the present application discloses a glass fiber packaging material. Referring to Figure 1 , a glass fiber packaging material includes an upper fabric 01, a glass fiber cloth 02, and a lower fabric 03 that are stacked up and down. Both the upper fabric 01 and the lower fabric 03 are made of waterproof and oil-proof materials. The glass fiber cloth 02 is stitched between the upper fabric 01 and the lower fabric 03, so that the glass fiber packaging material has good waterproof, oil-proof, and heat insulation properties.

[0036] In this embodiment, the glass fiber packaging material is integrally set to be rectangular. The upper fabric 01 and the glass fiber cloth 02 have the same size, and the size of the lower fabric 03 is larger than that of the upper fabric 01. When the centers of the upper fabric 01 and the lower fabric 03 coincide, each side of the lower fabric 03 extends to the outside of the upper fabric 01. The part of the lower fabric 03 extending to the outside of the upper fabric 01 is set as a flanging part. When stitching the glass fiber packaging material, the glass fiber packaging material is placed between the upper fabric 01 and the lower fabric 03. The flanging part of the lower fabric 03 is turned upward and covers the periphery of the upper fabric 01. Then, the operator stitches the flanging part, the upper fabric 01, the glass fiber cloth 02, and the lower fabric 03 together.

[0037] The embodiment of the present application also provides a fixture for stitching a glass fiber packaging material, which is used to clamp and fix the upper fabric 01, the glass fiber cloth 02, and the lower fabric 03 to be stitched, so as to facilitate the subsequent stitching operation. Referring to Figure 2 , a fixture for stitching a glass fiber packaging material includes a workbench 1 and a fixture frame 2 arranged on the workbench 1. A bearing cavity adapted to the outer shape of the glass fiber packaging material is formed in the middle of the fixture frame 2. The upper fabric 01, the glass fiber cloth 02, and the lower fabric 03 are placed in the bearing cavity. Preferably, no redundant connection structure is provided between the fixture frame 2 and the workbench 1, so that after the multi-layer fabrics (referring to the upper fabric 01, the glass fiber cloth 02, and the lower fabric 03 arranged from top to bottom) are fixed in the bearing cavity, the operator can remove the fixture frame 2 from the workbench 1 and transfer it to the stitching equipment.

[0038] Furthermore, referring to Figure 3, a clamping assembly 3 is provided on the fixture frame 2 for applying a clamping force to the multi-layer fabric placed in the bearing cavity. The clamping assembly 3 includes a cooperatively arranged upper pressing part 31 and a lower supporting part 32. The lower supporting part 32 is arranged below the bearing cavity, and the whole of the lower supporting part 32 has a frame structure adapted to the outer shape of the bearing cavity. The lower layer fabric 03 placed in the bearing cavity is in contact with the lower supporting part 32. The upper pressing part 31 is correspondingly arranged above the bearing cavity. The upper pressing part 31 is composed of a plurality of frame plates 311 connected end to end, and each frame plate 311 is respectively rotatably connected to each side of the fixture frame 2. The first limit position and the second limit position are within the rotation range of each frame plate 311. When all the frame plates 311 are located at the first limit position, all the frame plates 311 are located on the fixture frame 2 and away from the bearing cavity. When all the frame plates 311 are located at the second limit position, all the frame plates 311 are connected end to end to form a frame structure cooperating with the lower supporting part 32. At this time, the upper pressing part 31 is arranged parallel to the upper part of the lower supporting part 32, and the above multi-layer fabric is clamped and fixed between all the frame plates 311 and the lower supporting part 32 located at the second limit position. The rotational connection structure between each frame plate 311 and the fixture frame 2 belongs to common knowledge and will not be elaborated here.

[0039] Furthermore, the clamping assembly 3 further includes a plurality of magnetic adsorption blocks 33 arranged on the upper pressing part 31 and the lower supporting part 32. When each frame plate 311 rotates to the second limit position, each magnetic adsorption block 33 arranged on the upper pressing part 31 and each magnetic adsorption block 33 arranged on the lower supporting part 32 are in one-to-one correspondence up and down, and the two corresponding magnetic adsorption blocks 33 attract each other, so as to further apply a clamping force uniformly distributed in the circumferential direction to the multi-layer fabric arranged in the bearing cavity.

[0040] Referring to Figure 4 and Figure 5 , an embedding groove is opened on the outer periphery of the workbench 1. The lower end of the fixture frame 2 is placed in the embedding groove, and the upper surface of the lower supporting part 32 connected to the fixture frame 2 is flush with the upper surface of the workbench 1, so as to provide sufficient support for the lower layer fabric 03 when the lower layer fabric 03 is placed in the bearing cavity and prevent the lower layer fabric 03 from sagging downward.

[0041] A positioning assembly 4 is further provided on the workbench 1 for positioning the multi-layer fabric through the positioning holes 04 formed on the multi-layer fabric during the process of placing the multi-layer fabric in the bearing cavity. The positioning assembly 4 includes a lifting driver 41 installed on the workbench 1. The lifting driver 41 has a driving end extending upward, and the driving end is connected with a positioning rod 42. A through hole is opened on the workbench 1, and one end of the positioning rod 42 away from the lifting driver 41 extends into the through hole. By driving the positioning rod 42 to move through the lifting driver 41, the positioning rod 42 can extend out of or retract into the through hole. The lifting driver 41 is preferably a telescopic cylinder.

[0042] Matched with the positioning component 4, positioning holes 04 are formed at corresponding positions on the upper fabric 01, fiberglass cloth 02 and lower fabric 03. The aperture of the positioning hole 04 is slightly larger than the outer diameter of the positioning rod 42.

[0043] With the above structure, when arranging each layer in the bearing cavity, the lifting driver 41 drives the positioning rod 42 to extend out of the through hole, so that the positioning rod 42 extends into the bearing cavity. When placing each layer of fabric, the positioning holes 04 formed on each layer of fabric correspond to the positioning rod 42, and the positioning rod 42 passes through the positioning holes 04. In this process, the general positions of each layer of fabric can be determined, and the staff only needs to make simple adjustments to the corners and around the edges of each layer of fabric. After the clamping component 3 clamps and fixes each layer of fabric, it is necessary to transfer the fixture frame 2 from the workbench 1 to the sewing position. Therefore, it is necessary to drive the positioning rod 42 to descend through the lifting driver 41, so that the positioning rod 42 retracts back into the through hole again.

[0044] Refer to Figure 4 As shown in, a indentation mechanism 5 is further provided on the workbench 1. The indentation mechanism 5 includes several indentation plates 51 and several groups of driving components 52. Each group of driving components 52 is respectively used to drive the indentation plate 51 to rotate. An upward convex mounting platform 6 is formed on the outer periphery of the workbench 1. The above-mentioned groups of driving components 52 are all arranged on the mounting platform 6. The driving component 52 specifically includes a motor 522 mounted on the mounting platform 6. A rotating shaft 521 is connected to the driving end of the motor 522. A bearing seat matched with the rotating shaft 521 is arranged on the mounting platform 6. The rotating shaft 521 passes through the bearing seat and can rotate relative to the mounting platform 6. A transmission connecting piece 523 is fixed on the rotating shaft 521. One end of the transmission connecting piece 523 away from the rotating shaft 521 is fixedly connected to the indentation plate 51. It can be understood that the extending direction of the rotating shaft 521 is the same as the length extending direction of the indentation plate 51.

[0045] When the lower fabric 03 is placed in the bearing cavity, the outer periphery of the lower fabric 03 extends outside the bearing cavity and is placed on the upper pressing part 31 at the first limit position. At this time, the driving component 52 drives the indentation plate 51 to rotate in the vertical plane towards the direction close to the bearing cavity. When the indentation plate 51 rotates into the bearing cavity, one end of it can abut against the inner side surface of the fixture frame 2 forming the bearing cavity and the corner of the lower support part 32, so as to be able to shape the lower fabric 03 and form an indentation matched with the size of the bearing cavity on the lower fabric 03. Then the driving component 52 drives the indentation plate 51 to rotate in the reverse direction and reset. The generated indentation can facilitate the upper pressing part 31 to turn up the part outside the indentation.

[0046] The implementation principle of a stitching fixture for a glass fiber packaging material in an embodiment of the present application is as follows: First, place the fixture frame 2 on the workbench 1, and the lower end of the fixture frame 2 is embedded in the embedding groove. At this time, the upper surface of the lower support portion 32 is flush with the upper surface of the workbench 1. Then, the lifting drive 41 drives the positioning rod 42 to rise, so that the positioning rod 42 extends a certain length from the through hole. Bring the lower layer fabric 03 close to the fixture frame 2, and the positioning holes 04 formed in the lower layer fabric 03 pass through the positioning rod 42. The lower layer fabric 03 moves downward toward the bearing cavity and finally mostly lays on the surface of the lower support portion 32 that is flush with the workbench 1. The excess part of the lower layer fabric 03 is placed on the upper pressing portion 31 located at the first extreme position. At this time, the motor 522 of the drive assembly 52 is started, and the indentation plate 51 is driven to rotate into the bearing cavity through the rotating shaft 521 and the transmission connecting member 523, so that the indentation plate 51 abuts against the lower layer fabric 03 and applies pressure to the lower layer fabric 03, causing indentations to be generated on the four peripheries of the lower layer fabric 03 located in the bearing cavity. Then, the indentation plate 51 rotates in the reverse direction to the initial position. Then, the glass fiber cloth 02 and the upper layer fabric 01 are sequentially passed through the positioning rod 42 and placed in the bearing cavity, and the glass fiber cloth 02 and the upper layer fabric 01 are aligned at the four sides and corners. Rotate each frame plate 311 of the upper pressing portion 31 to the second extreme position. During the rotation of the frame plate 311, the part of the lower layer fabric 03 located outside the indentation can be driven to turn up and finally wrap around the periphery of the upper layer fabric 01. Under the combined action of the upper pressing portion 31, the lower support portion 32, and the magnetic adsorption block 33, the multi-layer fabric is clamped and fixed in the bearing cavity. Finally, the lifting drive 41 drives the positioning rod 42 to descend and return to the initial position, and the staff removes the fixture frame 2 and transfers it to the sewing equipment to sew the multi-layer fabric.

[0047] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A glass fiber packaging material, characterized in that: The invention comprises an upper layer of cloth (01), a glass fiber cloth (02) and a lower layer of cloth (03) which are stacked up and down, wherein the size of the upper layer of cloth (01) is the same as that of the glass fiber cloth (02), the size of the lower layer of cloth (03) is larger than that of the upper layer of cloth (01), and the portion of the lower layer of cloth (03) extending to the outside of the upper layer of cloth (01) is turned up to cover the periphery of the upper layer of cloth (01), the upper layer of cloth (01) and the glass fiber cloth (02) are sewn together with the lower layer of cloth (03) via the turned-up portion, and positioning holes (04) are reserved at corresponding positions of the upper layer of cloth (01), the glass fiber cloth (02) and the lower layer of cloth (03).

2. A clamp for sewing glass fiber packaging materials, used for clamping and fixing the lower layer fabric (03), the glass fiber fabric (02) and the upper layer fabric (01) as claimed in claim 1, characterized in that: The invention comprises a workbench (1) and a clamp frame (2) movably arranged on the workbench (1); a bearing cavity for receiving a lower layer of fabric (03), a glass fiber cloth (02) and an upper layer of fabric (01) is formed on the clamp frame (2); a clamping assembly (3) is arranged around the bearing cavity for driving the lower layer of fabric (03) to be turned up and clamping and fixing the lower layer of fabric (03), the glass fiber cloth (02) and the upper layer of fabric (01) to be sewn; the clamping assembly (3) comprises an upper pressing portion (31) and a lower supporting portion (32) distributed up and down; one side of the lower supporting portion (32) is integrally connected to the clamp frame (2) and the other side extends horizontally into the bearing cavity; the upper pressing portion (31) is rotatably mounted on the clamp frame (2).

3. A clamp for sewing glass fiber packaging materials according to claim 2, characterized in that: The upper clamping portion (31) and the lower supporting portion (32) are respectively arranged as frame structures adapted to the bearing cavity, the upper clamping portion (31) comprising a plurality of frame plates (311) connected end to end, each frame plate (311) being rotatably mounted on each side of the clamp frame (2).

4. A clamp for sewing glass fiber packaging materials according to claim 2 or 3, characterized in that: The clamping assembly (3) further comprises a plurality of magnetic adsorption blocks (33) which are arranged on the upper clamping portion (31) and the lower support portion (32) and correspond to each other up and down. The plurality of magnetic adsorption blocks (33) which are arranged on the upper clamping portion (31) and the lower support portion (32) are evenly distributed along the periphery of the bearing cavity.

5. A clamp for sewing glass fiber packaging materials according to claim 2, characterized in that: The workbench (1) is provided with a positioning assembly (4), the positioning assembly (4) being arranged below the fixture frame (2) and comprising a lifting drive (41) mounted on the workbench (1), the lifting drive (41) having a telescopic end extending vertically upward, the positioning assembly (4) further comprising a positioning rod (42) fixed to the telescopic end of the lifting drive (41), the positioning rod (42) being adapted to positioning holes (04) respectively formed on the lower layer of fabric (03), the glass fiber fabric (02) and the upper layer of fabric (01).

6. A clamp for sewing glass fiber packaging materials according to claim 2, characterized in that: The workbench (1) is provided with an embedding groove, the shape of which is compatible with the clamp frame (2), the lower end of the clamp frame (2) and the lower support portion (32) are both accommodated in the embedding groove, and the upper surface of the lower support portion (32) is flush with the upper surface of the workbench (1).

7. A clamp for sewing glass fiber packaging materials according to claim 2, characterized in that: The workbench (1) is provided with an indentation mechanism (5), the indentation mechanism (5) comprising a plurality of indentation plates (51), each of the indentation plates (51) corresponding to a periphery of the bearing cavity, and the indentation mechanism (5) further comprising a driving assembly (52) for driving each of the indentation plates (51) to rotate.

8. A clamp for sewing glass fiber packaging materials according to claim 7, characterized in that: The workbench (1) is provided with a mounting platform (6) extending vertically upward around the periphery. The drive assembly (52) is fixed on the mounting platform (6) and is provided in a plurality of groups. The plurality of groups of drive assemblies (52) correspond to a plurality of indentation plates (51) one by one. Each group of the drive assembly (52) comprises a rotating shaft (521) rotatably mounted on the mounting platform (6), a motor (522) driving the rotating shaft (521) to rotate, and a transmission connecting member (523) connecting the rotating shaft (521) and the indentation plate (51). The extending direction of the rotating shaft (521) is the same as the length direction of the indentation plate (51).

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