Linkage sleeve pressing mechanism

Abstract

The utility model relates to a linkage casing pressing mechanism which comprises a supporting frame, a casing pressing assembly, a linkage structure and a driving structure, the casing pressing assembly comprises a first pressing component and a second pressing component, and the first pressing component and the second pressing component are movably arranged on the two opposite sides of the supporting frame; the linkage structure comprises a swing part rotationally connected with the supporting frame, a first transmission part with the two ends rotationally connected with the first pressing and holding component and the swing part correspondingly, and a second transmission part with the two ends rotationally connected with the second pressing and holding component and the swing part correspondingly. The sleeving and pressing assembly is divided into two parts, the driving structure is matched to drive the second pressing and holding component to move, so that the second transmission part drives the swing part to swing, the first transmission part is driven, an outer wrapping paper cup and an inner cup are combined, movement in two directions is completed at the same time through one power source, the paper cup is sleeved more firmly, and the sleeving and pressing efficiency is improved. And the space ratio is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to outer paper cup preparation technical field, in particular to a linkage set pressure mechanism. BACKGROUND

[0002] The outer paper cup needs to be glued in the inner cup paper cup and the outer cup body inner wall to realize the combination of the inner cup and the outer cup after being produced by the forming machine.

[0003] In the prior art, the equipment for combining the outer paper cup and the inner cup needs two or more stations to complete this step, and the operation is to first set the inner cup and the outer paper cup together, and then transfer to a station to press the set inner cup and outer paper cup tightly to complete the close fit. The two stations cooperate to complete the bottom supporting and pressing process during the combination process. This method needs more than one power source to complete, and the space occupied is too large in some narrow equipment. The work of setting and pressing the inner cup and the outer paper cup by a single station is also completed by setting two power sources separately in the same station. Since the inner cup and the outer paper cup are set, the outer cup body is coated with glue, which will cause the combined height of the inner cup and the outer paper cup to be not uniform, which is not convenient for pressing. The traditional technology is not convenient for adjustment and adaptation to the combination of inner cups and outer paper cups of different heights. SUMMARY

[0004] Therefore, the utility model aims at providing a.

[0005] The utility model provides a linkage set pressure mechanism, include: support frame, set pressure subassembly, linkage structure and drive structure, set pressure subassembly includes first pressure holding member and second pressure holding member, first pressure holding member with second pressure holding member can move and set in the opposite sides of support frame, linkage structure includes with support frame swing joint swing piece, two ends are with first pressure holding member and swing piece rotation connection's first transmission part and two ends are with second pressure holding member and swing piece rotation connection's second transmission part, swing piece with support frame's rotation connection place is located between swing piece with first transmission part's rotation connection place and swing piece with second transmission part's rotation connection place, drive structure drive connection in first pressure holding member or second pressure holding member, to drive first pressure holding member or second pressure holding member close to or away from support frame.

[0006] In this way, by dividing the sleeve pressing assembly into two parts, and cooperating with the driving structure to drive the second pressing member to move, the second transmission member drives the swing member to start swinging, and then drives the first transmission member, so that the first pressing member moves towards the second pressing member, or the first pressing member and the second pressing member move away from each other, thereby combining the outer paper cup and the inner cup. One power source is used to complete the movement in two directions at the same time, the paper cup sleeve is pressed more firmly, the space occupation problem is reduced, and the distance between the first pressing member and the second pressing member can adapt to the combination of paper cups of more heights.

[0007] In one of the embodiments, the first pressing member comprises one or more first guide rods, a first sliding member and a first pressure component, all the first guide rods are fixedly connected to the support frame, the first sliding member is slidingly installed on all the first guide rods, and the first pressure component is arranged on the first sliding member and used to apply pressure to the paper cup. In this scheme, the first guide rods are two, and the first pressure component is located between the two first guide rods.

[0008] In this way, by using the two first guide rods as the guide rails of the first sliding member, the sliding is more stable and smooth, and the first pressure component can be more stable when pressing the inner cup.

[0009] In one of the embodiments, the first pressure component comprises a protruding portion, a pressing rod, a pressure piece and a buffer spring, the protruding portion is arranged on the first sliding member, the pressing rod is fixedly connected to the protruding portion and can extend into the paper cup, the pressure piece is slidingly connected to the pressing rod, the buffer spring is sleeved on the pressing rod and abuts against the pressure piece at one end, and the protruding portion and the first sliding member are integrally formed.

[0010] In this way, by using the pressure piece, when the inner cup is pressed, the friction coefficient between the outer cup and the inner cup gradually increases and exceeds the elastic coefficient of the buffer spring, the pressing rod can extend into the paper cup, so that the pressing process can be buffered, the integrity of the paper cup is better guaranteed, and the occurrence of defective products is avoided. The buffer spring can reset the pressure piece, thereby facilitating the combination of the next paper cup.

[0011] In one of the embodiments, the second pressing member comprises one or more second guide rods, a second sliding member and a second pressure component, all the second guide rods are fixedly connected to the side of the support frame away from all the first guide rods, the first sliding member is slidingly installed on all the second guide rods, and the second pressure component is arranged on the second sliding member and used to apply pressure to the paper cup. The second pressure component is opposite to the first pressure component in position. In this scheme, the number of the second guide rods is two, and the second pressure component is between the two second guide rods.

[0012] In this way, by using the two second guide rods as the guide rails of the second sliding member, the sliding is more stable and smooth, and the second pressure component can be more stable when pressing the outer paper cup.

[0013] In one of the embodiments, the second pressure component further comprises a protrusion, the carrier member is provided with a carrier groove for placing the inner cup, the protrusion is arranged on the carrier member and protrudes from the groove bottom of the carrier groove for supporting the outer cup, the carrier member is further provided with one or more weight reduction holes penetrating through the groove bottom of the carrier groove, and the protrusion is arranged around all the weight reduction holes. In this scheme, the number of weight reduction holes is seven.

[0014] In this way, by using the carrier groove arranged in the carrier member, the inner cup can be supported by the bottom wall of the carrier groove, facilitating the assembly into place, and the protrusion supports the outer paper cup, thereby further completing the assembly of the paper cup. The seven weight reduction holes can reduce the overall weight of the carrier member, prevent the service life of the second return spring from being reduced after long-term use, and reduce the maintenance frequency.

[0015] In one of the embodiments, the drive structure comprises a push-pull component, one or more first return springs, and one or more second return springs. The push-pull component is drivingly connected to the second sliding member to drive the second sliding member to move closer to or away from the support frame. All the first return springs are respectively sleeved on all the first guide rods, and both ends of all the first return springs are respectively abutted against the first sliding member and the support frame. All the second return springs are respectively sleeved on all the second guide rods, and both ends of all the second return springs are respectively abutted against the second sliding member and the support frame. In this scheme, the number of the first return springs and the second return springs is two, which are respectively sleeved on two first guide rods and two second guide rods.

[0016] In this way, by using the push-pull component to push the second pressure holding member, the second transmission member drives the swing member to start swinging, so that the first transmission member is driven to move the first pressure holding member towards the second pressure holding member, and the first return spring and the second return spring move the first pressure holding member and the second pressure holding member away from each other, thereby completing the overall drive. One power source is used to simultaneously complete the movement in two directions, and the paper cup sleeve is more firmly fitted, thereby reducing the problem of space occupation ratio.

[0017] In one of the embodiments, the push-pull component comprises a moving rod, a transmission wheel, and a drive cam. The moving rod is fixedly connected with the second sliding member. The transmission wheel is rotatably installed on the moving rod. The outer peripheral wall of the drive cam abuts against the transmission wheel.

[0018] Therefore, the utility model has the following advantages compared with the prior art:

[0019] 1. The linkage sleeve pressing mechanism according to the utility model, by the sleeve pressing assembly is divided into two parts, and then the driving structure drives the second pressing member to move, so that the second transmission member drives the swing member to start swinging, and then the first transmission member is driven, so that the first pressing member moves towards the second pressing member, or the first pressing member and the second pressing member move away from each other, so that the outer paper cup and the inner cup are combined, the movement in two directions is completed at the same time by using one power source, the paper cup is sleeved more firmly, the problem of space ratio is reduced, and the distance between the first pressing member and the second pressing member can adapt to paper cups of more heights.

[0020] 2. The linkage sleeve pressing mechanism according to the utility model, by utilizing the pressure piece when pressing the inner cup, the friction coefficient between the outer cup and the inner cup gradually increases and exceeds the spring coefficient of the buffer spring, the pressing rod can extend into the paper cup, so that the pressing process can be buffered, the integrity of the paper cup is better guaranteed, and the occurrence of defective products is avoided, and the buffer spring can reset the pressure piece, so that the next paper cup combination is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic view of the three-dimensional structure of the linkage sleeve pressing mechanism in the embodiment;

[0022] Figure 2 It is a schematic view of the back structure of the linkage sleeve pressing mechanism in the embodiment;

[0023] Figure 3 It is a schematic view of the cross-sectional structure of the linkage sleeve pressing mechanism in the embodiment;

[0024] Figure 4 It is a schematic view of the cross-sectional structure of the linkage sleeve pressing mechanism in the embodiment; Figure 3

[0025] REFERENCE SIGNS:

[0026] 10, support frame; 20, sleeve pressing assembly; 21, first pressing member; 211, first guide rod; 212, first sliding piece; 22, second pressing member; 221, second guide rod; 222, second sliding piece; 30, linkage structure; 31, swing piece; 32, first transmission piece; 33, second transmission piece; 40, driving structure; 41, push-pull part; 42, transmission wheel; 43, second return spring; 44, first return spring; 45, moving rod; 50, first pressure part; 51, protruding part; 52, pressing rod; 53, pressure piece; 54, buffer spring; 60, second pressure part; 61, bearing piece; 62, bearing groove; 63, protrusion; 64, weight-reducing hole. ​DETAILED DESCRIPTION

[0027] In order to make the above objectives, characteristics and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of ways other than those specifically described herein, and the present application is not limited to the embodiments described herein as long as they do not depart from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0028] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] In addition, the terms "first", "second", "third" and the like are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0030] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0032] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only embodiment.

[0033] Referring to Figures 1-4 The utility model discloses an interlocking cover mechanism, including support frame 10, cover and press assembly 20, interlocking structure 30 and drive structure 40, cover and press assembly 20 includes first pressure holding member 21 and second pressure holding member 22, first pressure holding member 21 with second pressure holding member 22 movably arranged in the opposite sides of support frame 10, interlocking structure 30 includes the swing piece 31 of rotation connection with support frame 10, the first transmission 32 of two ends respectively with first pressure holding member 21 and swing piece 31 rotation connection and the second transmission 33 of two ends respectively with second pressure holding member 22 and swing piece 31 rotation connection, the rotation connection of swing piece 31 with support frame 10 is located between the rotation connection of swing piece 31 with first transmission 32 and the rotation connection of swing piece 31 with second transmission 33, drive structure 40 drive connection in first pressure holding member 21 or second pressure holding member 22, to drive first pressure holding member 21 or second pressure holding member 22 close or away from support frame 10.

[0034] It can be understood that by dividing the sleeve pressing assembly 20 into two parts, and cooperating with the driving structure 40 to drive the second pressing member 22 to move, so that the second transmission member 33 drives the swing member 31 to start swinging, and then drives the first transmission member 32, so that the first pressing member 21 moves towards the second pressing member 22, or the first pressing member 21 and the second pressing member 22 move away from each other, thereby combining the outer paper cup and the inner cup., using a power source to complete the movement in two directions at the same time, and making the paper cup sleeve more firm, reducing the problem of space ratio, and the distance between the first pressing member 21 and the second pressing member 22 can adapt to the combination of paper cups of more height.

[0035] In combination Figures 1-4 As shown, the first pressing member 21 comprises one or more first guide rods 211, a first sliding member 212 and a first pressure component 50, all of which are fixedly connected to the support frame 10; the first sliding member 212 is slidingly installed on all the first guide rods 211; the first pressure component 50 is arranged on the first sliding member 212 for applying pressure to the paper cup. In the present scheme, the first guide rod 211 is two, and the first pressure component 50 is located between the two first guide rods 211.

[0036] It can be understood that by using two first guide rods 211 as the guide rail of the first sliding member 212, the sliding is more stable and smooth, and the cooperation of the first pressure component 50 can make the process of pressing the inner cup more stable.

[0037] In combination Figures 1-4 As shown, the first pressure component 50 comprises a protruding portion 51, a pressing rod 52, a pressure piece 53 and a buffer spring 54, the protruding portion 51 is arranged on the first sliding member 212; the pressing rod 52 is fixedly connected to the protruding portion 51, and the pressing rod 52 can extend into the paper cup; the pressure piece 53 is slidingly connected to the pressing rod 52; the buffer spring 54 is sleeved on the pressing rod 52, one end of which abuts against the pressure piece 53, and the protruding portion 51 and the first sliding member 212 are integrally formed.

[0038] It can be understood that by using the pressure piece 53 to press the inner cup, the friction coefficient between the outer cup and the inner cup gradually increases to exceed the spring coefficient of the buffer spring 54, the pressing rod 52 can extend into the paper cup, so that the pressing process can be buffered, and the integrity of the paper cup can be better guaranteed, avoiding the occurrence of defective products. The buffer spring 54 can also reset the pressure piece 53, thereby facilitating the combination of the next paper cup.

[0039] In combination Figures 1-4As shown, the second pressing member 22 comprises one or more second guide rods 221, a second sliding member 222 and a second pressure component 60, all the second guide rods 221 are fixedly connected to the side of the support frame 10 away from all the first guide rods 211; the first sliding member 212 is slidingly installed on all the second guide rods 221; the second pressure component 60 is arranged on the second sliding member 222 for applying pressure to the paper cup, the second pressure component 60 is opposite to the first pressure component 50 in position, and the number of the second guide rods 221 in the scheme is two, and the second pressure component 60 is between the two second guide rods 221.

[0040] It can be understood that, by using two second guide rods 221 as the guide rails of the second sliding member 222, the sliding is more stable and smooth, and the second pressure component 60 can be more stable when completing the upper pressing of the outer paper cup.

[0041] In combination Figures 1-4 As shown, the second pressure component 60 further comprises a protrusion 63, the carrier 61 is provided with a carrier groove 62 for placing an inner cup, the protrusion 63 is arranged on the carrier 61 and protrudes from the groove bottom of the carrier groove 62, for supporting an outer cup, the carrier 61 is further provided with one or more weight reduction holes 64 penetrating the groove bottom of the carrier groove 62, and the protrusion 63 is arranged around all the weight reduction holes 64, and the number of the weight reduction holes 64 in the scheme is seven.

[0042] It can be understood that, by using the carrier 61 to open the carrier groove 62, the inner cup can be supported by the bottom wall of the carrier groove 62, which is convenient for combination in place, and the protrusion 63 supports the outer paper cup, so as to further complete the paper cup combination, and the seven weight reduction holes 64 can reduce the overall weight of the carrier 61, prevent the service life of the second return spring 43 from being reduced after long-time use, and reduce the maintenance frequency.

[0043] In combination Figures 1-4As shown, the driving structure 40 comprises: a push-pull component 41, one or more first reset springs 44 and one or more second reset springs 43, the push-pull component 41 is drivingly connected to the second sliding piece 222 to drive the second sliding piece 222 to move close to or away from the support frame 10; all the first reset springs 44 are sleeved on all the first guide rods 211, and both ends of all the first reset springs 44 abut against the first sliding piece 212 and the support frame 10 respectively; all the second reset springs 43 are sleeved on all the second guide rods 221, and both ends of all the second reset springs 43 abut against the second sliding piece 222 and the support frame 10 respectively, and the number of the first reset springs 44 and the second reset springs 43 in the scheme is two, which are sleeved on two first guide rods 211 and two second guide rods 221 respectively.

[0044] As can be understood, by pushing the second pressing member 22 by the push-pull component 41, the second transmission member 33 drives the swing member 31 to start swinging, so that the first transmission member 32 is driven, and the first pressing member 21 moves towards the second pressing member 22, and the first reset spring 44 and the second reset spring 43 move the first pressing member 21 and the second pressing member 22 away from each other, completing the overall driving, using one power source to complete the movement in two directions at the same time, and making the paper cup sleeve more firm, reducing the problem of space ratio.

[0045] In combination Figures 1-4 As shown, the push-pull component 41 comprises: a moving rod 45, a transmission wheel 42 and a driving cam, the moving rod 45 is fixedly connected with the second sliding piece 222; the transmission wheel 42 is rotatably installed on the moving rod 45; and the outer peripheral wall of the driving cam abuts against the transmission wheel 42.

[0046] The working principle of the linkage sleeve pressing mechanism is as follows: when the paper cup needs to be combined, the outer paper cup and the inner cup are placed on the bearing 61, the cam with the motor is started, the cam rotates, the transmission wheel 42 rotates with the cam, the moving rod 45 is pushed to move due to the characteristics of the cam, the second sliding part 222 is driven to move along the second guide rod 221, the second transmission part 33 drives the swing part 31 to swing, and the first transmission part 32 is driven to move the first sliding part 212 along the first guide rod 211, at this time, the second sliding part 222 and the first sliding part 212 are close to each other, the first pressure part 50 and the bearing 61 are close to each other, the first return spring 44 and the second return spring 43 are not compressed, and the paper cup is combined, wherein the pressure part 53 exerts pressure on the inner cup, and the counterforce is generated due to the gradually increasing friction during the combination of the outer paper cup and the inner cup, so that the lower pressing rod 52 extends into the inner cup, the pressure part 53 compresses the buffer spring 54, thereby reducing the problem that the excessive force caused by the pressing causes damage during the combination, and after the combination, the cam continues to rotate, the moving rod 45 is not driven to move due to the characteristics of the cam, the first return spring 44 and the second return spring 43 are not compressed and start to reset, the second sliding part 222 and the first sliding part 212 are away from each other, and the second transmission part 33 drives the swing part 31 to swing, and the first transmission part 32 is driven to play an auxiliary role.

[0047] The technical features of the above-described embodiments can be combined in any manner, and to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0048] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A linkage sleeve press mechanism characterized by, The utility model relates to a paper cup pressing device, which comprises the following parts: a support frame (10); a sleeve pressing assembly (20) comprising a first pressing member (21) and a second pressing member (22), which are movably arranged on opposite sides of the support frame (10); a linkage structure (30) comprising a swing member (31) rotatably connected to the support frame (10), a first transmission member (32) having two ends rotatably connected to the first pressing member (21) and the swing member (31) respectively, and a second transmission member (33) having two ends rotatably connected to the second pressing member (22) and the swing member (31) respectively; the rotatable connection between the swing member (31) and the support frame (10) is located between the rotatable connections between the swing member (31) and the first transmission member (32) and between the swing member (31) and the second transmission member (33); and a driving structure (40) drivingly connected to the first pressing member (21) or the second pressing member (22) to drive the first pressing member (21) or the second pressing member (22) to move towards or away from the support frame (10). The first pressing member (21) comprises one or more first guide rods (211) fixedly connected to the support frame (10), a first sliding member (212) slidingly mounted on all the first guide rods (211), and a first pressure component (50) arranged on the first sliding member (212) for applying pressure to a paper cup.

2. The linkage sleeve press mechanism of claim 1, wherein, The first pressure component (50) comprises a protruding portion (51) arranged on the first sliding member (212), a pressing rod (52) fixedly connected to the protruding portion (51) and capable of extending into a paper cup, a pressure member (53) slidingly connected to the pressing rod (52), and a buffer spring (54) sleeved on the pressing rod (52) and abutting against the pressure member (53) at one end. The protruding portion (51) is integrally formed with the first sliding member (212). The second pressing member (22) comprises one or more second guide rods (221) fixedly connected to the side of the support frame (10) away from all the first guide rods (211), a second sliding member (222) slidingly mounted on all the second guide rods (221), and a second pressure component (60) arranged on the second sliding member (222) for applying pressure to a paper cup, which is located opposite to the first pressure component (50).

3. The gang nest press of claim 2 wherein, The second pressure component (60) comprises a protruding portion (61) arranged on the second sliding member (222), a pressing rod (62) fixedly connected to the protruding portion (61) and capable of extending into a paper cup, a pressure member (63) slidingly connected to the pressing rod (62), and a buffer spring (64) sleeved on the pressing rod (62) and abutting against the pressure member (63) at one end. ​ ​ ​ ​ 4. The gang nest press of claim 3 wherein, ​ 5. The gang cover press of claim 2 wherein, ​ ​ ​ ​ 6. The linked sleeve press mechanism of claim 5, wherein, ​ A bearing member (61) is fixedly installed on the second sliding member (222).

7. The linked sleeve press mechanism of claim 6, wherein, The second pressing member (60) further comprises a protrusion (63), the bearing member (61) is provided with a bearing groove (62) for placing an inner cup, and the protrusion (63) is arranged on the bearing member (61) and protrudes from the groove bottom of the bearing groove (62) to support an outer cup.

8. The gang nest press of claim 7 wherein, The bearing member (61) is further provided with one or more lightening holes (64) penetrating through the groove bottom of the bearing groove (62), and the protrusion (63) is arranged around all the lightening holes (64).

9. The gang tipping sleeve press of claim 5 wherein, The driving structure (40) comprises: a push-pull member (41) drivingly connected to the second sliding member (222) to drive the second sliding member (222) to approach or move away from the support frame (10); one or more first return springs (44), all the first return springs (44) are respectively sleeved on all the first guide rods (211), and both ends of all the first return springs (44) are respectively abutted against the first sliding member (212) and the support frame (10); and one or more second return springs (43), all the second return springs (43) are respectively sleeved on all the second guide rods (221), and both ends of all the second return springs (43) are respectively abutted against the second sliding member (222) and the support frame (10).

10. The gang nest press of claim 9 wherein, The push-pull member (41) comprises: a moving rod (45) fixedly connected with the second sliding member (222); a transmission wheel (42) rotatably installed on the moving rod (45); and a driving cam, an outer peripheral wall of the driving cam abutting against the transmission wheel (42).

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