Pressing device

Abstract

The embodiment of the utility model provides a pressing device, and relates to the technical field of mechanical equipment. The pressing device comprises a pressing platform and a pressing module, the pressing platform is used for installing a workpiece carrier, the pressing module comprises a first pressing mechanism, a second pressing mechanism and a driving part, the first pressing mechanism, the second pressing mechanism and the driving part are all arranged on the pressing platform, and the first pressing mechanism and the second pressing mechanism are arranged in a spaced mode. The first pressing mechanism and the second pressing mechanism are rotationally connected to the driving part; the driving part is used for driving the first pressing mechanism and the second pressing mechanism to rotate at the same time so as to press the workpiece on the workpiece carrier. According to the pressing device, the workpiece can be rapidly pressed under rated pressure, the situation that the workpiece is damaged or cannot be pressed tightly is avoided, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment, in particular to a pressing device. Background Art

[0002] When a workpiece is being cut by a CNC machine tool, it is necessary to first position and clamp the workpiece. In the prior art, the workpiece is usually placed on a base, and then a pressure plate is placed on the workpiece, and then the pressure plate and the base are fixed with screws to clamp the workpiece.

[0003] However, with this clamping method, the clamping force is difficult to control. High pressure can easily damage the workpiece, while low pressure can easily cause it to not be clamped tightly. In addition, since the clamping method is manual, the clamping time is long, resulting in low work efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a pressing device, which can quickly press a workpiece with a rated pressure, avoid causing damage to the workpiece or preventing the workpiece from being pressed insufficiently, and improve work efficiency.

[0005] The embodiment of the present utility model is achieved as follows:

[0006] In a first aspect, the present invention provides a pressing device, comprising:

[0007] a pressing platform for mounting a workpiece carrier; and

[0008] A clamping module, the clamping module comprising a first clamping mechanism, a second clamping mechanism, and a driving member, the first clamping mechanism, the second clamping mechanism, and the driving member are all disposed on the clamping platform, the first clamping mechanism and the second clamping mechanism are spaced apart, and the first clamping mechanism and the second clamping mechanism are both rotatably connected to the driving member;

[0009] The driving member is used to simultaneously drive the first pressing mechanism and the second pressing mechanism to rotate, so as to press the workpiece on the workpiece carrier.

[0010] In an optional embodiment, the first clamping mechanism includes a first fixed block, a first connecting rod and a first pressing block, the first fixed block is arranged on the clamping platform, the two ends of the first connecting rod are rotatably connected to the first fixed block and the first pressing block respectively, and the first pressing block is rotatably connected to the driving member.

[0011] In an optional embodiment, the first pressing block includes a first pressing portion, a first rotating portion, and a second rotating portion, and the first pressing portion, the first rotating portion, and the second rotating portion are connected in sequence;

[0012] The first rotating portion is rotatably connected to the first connecting rod, and the second rotating portion is rotatably connected to the driving member.

[0013] In an optional embodiment, the second clamping mechanism includes a second fixed block, a second connecting rod and a second pressing block, the second fixed block is arranged on the clamping platform, the two ends of the second connecting rod are rotatably connected to the second fixed block and the second pressing block respectively, and the second pressing block is rotatably connected to the driving member.

[0014] In an optional embodiment, the second pressing block includes a second pressing portion, a third rotating portion, and a fourth rotating portion, and the second pressing portion, the third rotating portion, and the fourth rotating portion are connected in sequence;

[0015] The third rotating portion is rotatably connected to the second connecting rod, and the fourth rotating portion is rotatably connected to the driving member.

[0016] In an optional embodiment, the pressing module further includes a connecting block, which is rotatably connected to the first pressing mechanism and the second pressing mechanism at the same time, and the driving member is fixedly connected to the connecting block.

[0017] In an optional embodiment, the pressing platform includes a base, a fixing plate, and a plurality of support columns, the base and the fixing plate are spaced apart, the plurality of support columns are arranged between the base and the fixing plate, and are connected to the base and the fixing plate at the same time, and the fixing plate is used to mount the workpiece carrier;

[0018] The first clamping mechanism and the second clamping mechanism are both arranged on a side of the fixed plate away from the base, the driving member is arranged on the base, and one end of the driving member is passed through the fixed plate and is rotatably connected to the first clamping mechanism and the second clamping mechanism.

[0019] In an optional embodiment, the pressing device further includes a plurality of positioning pins, which are arranged at intervals on the fixing plate and are located on a side of the fixing plate away from the base.

[0020] In an optional embodiment, the fixing plate is provided with a mounting groove, the first pressing mechanism and the second pressing mechanism are arranged at intervals in the mounting groove, and one end of the driving member is passed through the mounting groove.

[0021] In an optional embodiment, the first pressing mechanism, the second pressing mechanism, and the driving member are all multiple in number, and the multiple driving members, the multiple first pressing mechanisms, and the multiple second pressing mechanisms are all spaced apart on the pressing platform;

[0022] The plurality of driving members correspond one-to-one to the plurality of first clamping mechanisms, and the plurality of driving members correspond one-to-one to the plurality of second clamping mechanisms, and each of the driving members is rotatably connected to one of the first clamping mechanisms and one of the second clamping mechanisms at the same time.

[0023] The beneficial effects of the embodiments of the present utility model include:

[0024] The clamping device includes a clamping platform and a clamping module. The clamping platform is used to install a workpiece carrier. The clamping module includes a first clamping mechanism, a second clamping mechanism and a driving member. The first clamping mechanism, the second clamping mechanism and the driving member are all arranged on the clamping platform. The first clamping mechanism and the second clamping mechanism are arranged at intervals, and the first clamping mechanism and the second clamping mechanism can be rotatably connected to the driving member; wherein the driving member is used to simultaneously drive the first clamping mechanism and the second clamping mechanism to rotate so as to clamp the workpiece on the workpiece carrier.

[0025] That is to say, by setting the clamping force for the driving member and then driving the first clamping mechanism and the second clamping mechanism to rotate at the same time, the workpiece placed on the workpiece carrier can be quickly clamped, which can avoid damage to the workpiece or failure to clamp tightly, thereby saving material loss and improving product yield and work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic structural diagram of a pressing device provided in an embodiment of the present utility model;

[0028] Figure 2 A schematic diagram of the assembly of the clamping device and the workpiece carrier provided in an embodiment of the present utility model;

[0029] Figure 3 A schematic structural diagram of a compression module provided in an embodiment of the present utility model;

[0030] Figure 4 An exploded view of a compression module provided in an embodiment of the present utility model;

[0031] Figure 5 This is a structural schematic diagram of the compacting platform provided in an embodiment of the present utility model.

[0032] Icons: 100-clamping device; 10-clamping platform; 11-base; 12-fixed plate; 121-mounting slot; 13-support column; 20-clamping module; 21-first clamping mechanism; 211-first fixed block; 212-first connecting rod; 213-first pressing block; 2131-first clamping part; 2132-first rotating part; 2133-second rotating part; 22-second clamping mechanism; 221-second fixed block; 222-second connecting rod; 223-second pressing block; 2231-second clamping part; 2232-third rotating part; 2233-fourth rotating part; 23-driving member; 24-connecting block; 30-locating pin; 200-workpiece carrier; 300-workpiece. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0038] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0039] As described in the background, when a workpiece is being cut on a CNC machine tool, it must first be positioned and clamped. In the prior art, the workpiece is typically placed on a base, a pressure plate is then placed on the workpiece, and the pressure plate is then fixed to the base using screws to clamp the workpiece. However, this clamping method is difficult to control: high pressure can easily damage the workpiece, while low pressure can easily cause it to become loose. Furthermore, because the clamping method is manual, it takes a long time to clamp, resulting in low work efficiency.

[0040] Based on this, please refer to Figure 1-Figure 5 The present invention provides a clamping device 100 that effectively addresses the aforementioned technical issues. Specifically, it can quickly clamp a workpiece 300 at a rated pressure, avoiding damage to the workpiece 300 or insufficient clamping, thereby improving work efficiency. The clamping device 100 will be described in detail below.

[0041] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic structural diagram of the pressing device 100 provided in this embodiment. Figure 2 The assembly diagram of the clamping device 100 and the workpiece carrier 200 provided in this embodiment is shown in FIG. Figure 1 and Figure 2The clamping device 100 includes a clamping platform 10 and a clamping module 20. The clamping platform 10 is used to install the workpiece carrier 200. The clamping module 20 includes a first clamping mechanism 21, a second clamping mechanism 22 and a driving member 23. The first clamping mechanism 21, the second clamping mechanism 22 and the driving member 23 are all arranged on the clamping platform 10. The first clamping mechanism 21 and the second clamping mechanism 22 are arranged at intervals, and the first clamping mechanism 21 and the second clamping mechanism 22 are both rotatably connected to the driving member 23; wherein the driving member 23 is used to simultaneously drive the first clamping mechanism 21 and the second clamping mechanism 22 to rotate so as to clamp the workpiece 300 on the workpiece carrier 200.

[0042] That is to say, by setting the clamping force for the driving member 23 and then driving the first clamping mechanism 21 and the second clamping mechanism 22 to rotate at the same time, the workpiece 300 placed on the workpiece carrier 200 can be quickly clamped, which can avoid damage to the workpiece 300 or failure to clamp it tightly, thereby saving material loss and improving product yield and work efficiency.

[0043] It should be noted that in this embodiment, the specific shape of the workpiece 300 is "U"-shaped, and there are two workpieces 300, which are respectively arranged in the two placement slots of the workpiece carrier 200 at intervals. It is easy to understand that the first clamping mechanism 21 clamps one of the workpieces 300, and the second clamping mechanism 22 clamps the other workpiece 300. Of course, in other embodiments, the workpiece 300 can also be of other shapes, and the two workpieces 300 can also be arranged in an integrated manner, with the first clamping mechanism 21 and the second clamping mechanism 22 simultaneously clamping and fixing two positions of the same workpiece 300.

[0044] Furthermore, in order to improve the clamping effect on the workpiece 300 and enhance the clamping stability, in the present embodiment, the number of the clamping modules 20 is multiple, that is, the number of the first clamping mechanism 21, the second clamping mechanism 22 and the driving member 23 are all multiple, and the multiple driving members 23, the multiple first clamping mechanisms 21 and the multiple second clamping mechanisms 22 are all arranged at intervals on the clamping platform 10; the multiple driving members 23 correspond one-to-one to the multiple first clamping mechanisms 21, and the multiple driving members 23 correspond one-to-one to the multiple second clamping mechanisms 22, and each driving member 23 is simultaneously rotatably connected to a first clamping mechanism 21 and a second clamping mechanism 22.

[0045] Specifically, please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic structural diagram of the compression module 20 provided in this embodiment. Figure 4 The exploded view of the compression module 20 provided in this embodiment is combined with Figure 3 and Figure 4The first clamping mechanism 21 includes a first fixed block 211, a first connecting rod 212, and a first pressing block 213. The first fixed block 211 is provided on the clamping platform 10. The two ends of the first connecting rod 212 are rotatably connected to the first fixed block 211 and the first pressing block 213, respectively. The first pressing block 213 is rotatably connected to the driving member 23. Similarly, the second clamping mechanism 22 includes a second fixed block 221, a second connecting rod 222, and a second pressing block 223. The second fixed block 221 is provided on the clamping platform 10. The two ends of the second connecting rod 222 are rotatably connected to the second fixed block 221 and the second pressing block 223, respectively. The second pressing block 223 is rotatably connected to the driving member 23.

[0046] As is readily understood, under the action of the driving member 23, the first pressing block 213 rotates relative to the driving member 23 and the first connecting rod 212, while the first connecting rod 212 rotates relative to the first fixed block 211. Simultaneously, the second pressing block 223 also rotates relative to the driving member 23 and the second connecting rod 222, while the second connecting rod 222 also rotates relative to the second fixed block 221. Because the first fixed block 211 and the second fixed block 221 are both fixed to the clamping platform 10, this lever principle allows a single driving member 23 to simultaneously rotate the first and second pressing blocks 213, 223, respectively, to clamp the workpieces 300 on both sides, thereby improving work efficiency and clamping stability.

[0047] Furthermore, the first pressing block 213 includes a first pressing portion 2131, a first rotating portion 2132, and a second rotating portion 2133, which are sequentially connected; the first rotating portion 2132 is rotatably connected to the first connecting rod 212, and the second rotating portion 2133 is rotatably connected to the driving member 23. Similarly, the second pressing block 223 includes a second pressing portion 2231, a third rotating portion 2232, and a fourth rotating portion 2233, which are sequentially connected; the third rotating portion 2232 is rotatably connected to the second connecting rod 222, and the fourth rotating portion 2233 is rotatably connected to the driving member 23.

[0048] It can be understood that by setting different rotating parts, they can be rotationally connected to the connecting rod and the driving member 23 respectively, and the corresponding workpiece 300 can be clamped by the first clamping part 2131 and the second clamping part 2231 to achieve smooth operation of the clamping mechanism.

[0049] It should be noted that in this embodiment, the driving member 23 is specifically a cylinder. As can be easily understood, by setting the pressure of the compressed air, different rated pressures can be achieved for compacting the workpiece 300. Of course, in other embodiments, the driving member 23 can also be other driving structures such as a hydraulic cylinder or an electric push rod.

[0050] Please continue to combine Figure 3 and Figure 4 In order to better transmit the force of the driving member 23 to the first clamping mechanism 21 and the second clamping mechanism 22, in this embodiment, the clamping module 20 also includes a connecting block 24, which is rotatably connected to the first clamping mechanism 21 and the second clamping mechanism 22 at the same time, and the driving member 23 is fixedly connected to the connecting block 24.

[0051] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of the compacting platform 10 provided in this embodiment, combined with Figure 1 and Figure 5 Specifically, the clamping platform 10 includes a base 11, a fixed plate 12 and a plurality of support columns 13. The base 11 and the fixed plate 12 are spaced apart. The plurality of support columns 13 are arranged between the base 11 and the fixed plate 12, and are connected to the base 11 and the fixed plate 12 at the same time. The fixed plate 12 is used to install the workpiece carrier 200; the first clamping mechanism 21 and the second clamping mechanism 22 are both arranged on the side of the fixed plate 12 away from the base 11, the driving member 23 is arranged on the base 11, and one end of the driving member 23 is passed through the fixed plate 12, and is rotatably connected to the first clamping mechanism 21 and the second clamping mechanism 22 at the same time.

[0052] Furthermore, in order to facilitate the installation of the first clamping mechanism 21 and the second clamping mechanism 22, in this embodiment, the fixing plate 12 is provided with an installation groove 121, the first clamping mechanism 21 and the second clamping mechanism 22 are spaced apart in the installation groove 121, and one end of the driving member 23 is passed through the installation groove 121.

[0053] It is easy to understand that the bottom wall of the mounting groove 121 can be provided with a through hole, and one end of the driving member 23 extends through the through hole and is simultaneously rotatably connected to the first clamping mechanism 21 and the second clamping mechanism 22. The provision of the mounting groove 121 can also protect the operational stability of the first clamping mechanism 21 and the second clamping mechanism 22, and reduce the problem of interference with other parts of the device during the movement of the mechanism.

[0054] To better position and install the workpiece carrier 200, the clamping device 100 further includes a plurality of positioning pins 30, which are spaced apart on the fixing plate 12 and located on a side of the fixing plate 12 away from the base 11. As will be readily understood, the workpiece carrier 200 is provided with a plurality of corresponding positioning holes, and the cooperation between the positioning holes and the positioning pins 30 enables precise positioning and improves the stability of the workpiece 300 after being clamped.

[0055] It should be noted that, in this embodiment, the specific number of positioning pins 30 is two, and the two positioning pins 30 are arranged diagonally; of course, in other embodiments, the number of positioning pins 30 can also be three, four or five, etc., and the specific arrangement is not limited and needs to be determined according to actual positioning requirements.

[0056] In addition, it should be noted that the clamping module 20 provided in this embodiment can also clamp and fix the workpiece carrier 200 at the same time. Specifically, by extending the first clamping mechanism 21 and the second clamping mechanism 22 out of the workpiece carrier 200 at the same time, that is, the workpiece carrier 200 is provided with an avoidance gap to avoid the first clamping mechanism 21 and the second clamping mechanism 22, thereby simplifying the overall structure of the workpiece carrier 200 and improving the lightweight level.

[0057] To sum up, an embodiment of the present invention provides a clamping device 100, which includes a clamping platform 10 and a clamping module 20. The clamping platform 10 is used to install a workpiece carrier 200. The clamping module 20 includes a first clamping mechanism 21, a second clamping mechanism 22 and a driving member 23. The first clamping mechanism 21, the second clamping mechanism 22 and the driving member 23 are all arranged on the clamping platform 10. The first clamping mechanism 21 and the second clamping mechanism 22 are arranged at intervals, and the first clamping mechanism 21 and the second clamping mechanism 22 can be rotatably connected to the driving member 23; wherein the driving member 23 is used to simultaneously drive the first clamping mechanism 21 and the second clamping mechanism 22 to rotate so as to clamp the workpiece 300 on the workpiece carrier 200. That is to say, by setting the clamping force for the driving member 23 and then driving the first clamping mechanism 21 and the second clamping mechanism 22 to rotate at the same time, the workpiece 300 placed on the workpiece carrier 200 can be quickly clamped, which can avoid damage to the workpiece 300 or failure to clamp it tightly, thereby saving material loss and improving product yield and work efficiency.

[0058] The above description is merely a specific embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pressing device, characterized in that: include: A pressing platform (10), the pressing platform (10) being used to mount a workpiece carrier (200); and A clamping module (20), the clamping module (20) comprising a first clamping mechanism (21), a second clamping mechanism (22) and a driving member (23), the first clamping mechanism (21), the second clamping mechanism (22) and the driving member (23) being all arranged on the clamping platform (10), the first clamping mechanism (21) and the second clamping mechanism (22) being spaced apart, and the first clamping mechanism (21) and the second clamping mechanism (22) being both rotatably connected to the driving member (23); The driving member (23) is used to simultaneously drive the first pressing mechanism (21) and the second pressing mechanism (22) to rotate, so as to press the workpiece (300) on the workpiece carrier (200).

2. The pressing device according to claim 1, characterized in that The first clamping mechanism (21) includes a first fixed block (211), a first connecting rod (212) and a first pressing block (213); the first fixed block (211) is arranged on the clamping platform (10); the two ends of the first connecting rod (212) are rotatably connected to the first fixed block (211) and the first pressing block (213), respectively; the first pressing block (213) is rotatably connected to the driving member (23).

3. The pressing device according to claim 2, characterized in that: The first pressing block (213) comprises a first pressing portion (2131), a first rotating portion (2132) and a second rotating portion (2133), wherein the first pressing portion (2131), the first rotating portion (2132) and the second rotating portion (2133) are connected in sequence; The first rotating portion (2132) is rotatably connected to the first connecting rod (212), and the second rotating portion (2133) is rotatably connected to the driving member (23).

4. The pressing device according to claim 1, characterized in that The second clamping mechanism (22) includes a second fixed block (221), a second connecting rod (222) and a second pressing block (223); the second fixed block (221) is arranged on the clamping platform (10); the two ends of the second connecting rod (222) are rotatably connected to the second fixed block (221) and the second pressing block (223), respectively; the second pressing block (223) is rotatably connected to the driving member (23).

5. The pressing device according to claim 4, characterized in that: The second pressing block (223) comprises a second pressing portion (2231), a third rotating portion (2232) and a fourth rotating portion (2233), and the second pressing portion (2231), the third rotating portion (2232) and the fourth rotating portion (2233) are connected in sequence; The third rotating portion (2232) is rotatably connected to the second connecting rod (222), and the fourth rotating portion (2233) is rotatably connected to the driving member (23).

6. The pressing device according to claim 1, characterized in that: The pressing module (20) further comprises a connecting block (24), wherein the connecting block (24) is rotatably connected to the first pressing mechanism (21) and the second pressing mechanism (22), and the driving member (23) is fixedly connected to the connecting block (24).

7. The pressing device according to claim 1, characterized in that: The pressing platform (10) includes a base (11), a fixing plate (12) and a plurality of support columns (13); the base (11) and the fixing plate (12) are spaced apart; the plurality of support columns (13) are arranged between the base (11) and the fixing plate (12) and are connected to the base (11) and the fixing plate (12) at the same time; the fixing plate (12) is used to install the workpiece carrier (200); The first clamping mechanism (21) and the second clamping mechanism (22) are both arranged on a side of the fixed plate (12) away from the base (11), the driving member (23) is arranged on the base (11), and one end of the driving member (23) is passed through the fixed plate (12) and is rotatably connected to the first clamping mechanism (21) and the second clamping mechanism (22).

8. The pressing device according to claim 7, characterized in that: The pressing device (100) further comprises a plurality of positioning pins (30), wherein the plurality of positioning pins (30) are arranged at intervals on the fixing plate (12) and are located on a side of the fixing plate (12) away from the base (11).

9. The pressing device according to claim 7, characterized in that: The fixing plate (12) is provided with a mounting groove (121), the first pressing mechanism (21) and the second pressing mechanism (22) are arranged at intervals in the mounting groove (121), and one end of the driving member (23) is passed through the mounting groove (121).

10. The pressing device according to claim 1, characterized in that: The first pressing mechanism (21), the second pressing mechanism (22) and the driving member (23) are all multiple in number, and the multiple driving members (23), the multiple first pressing mechanisms (21) and the multiple second pressing mechanisms (22) are all arranged at intervals on the pressing platform (10); The plurality of driving members (23) correspond one-to-one to the plurality of first pressing mechanisms (21), and the plurality of driving members (23) correspond one-to-one to the plurality of second pressing mechanisms (22), and each of the driving members (23) is rotatably connected to one of the first pressing mechanisms (21) and one of the second pressing mechanisms (22) at the same time.

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