Pin penetrating type row chain dismounting device

Abstract

The utility model relates to the field of auxiliary tools for disassembling parts of tobacco shredding equipment, and discloses a pin penetrating type row chain disassembling device which is characterized in that a row chain pin is ejected out by a section through an extrusion part, then a driving assembly drives a clamping part to drag the row chain pin, and a row chain is disassembled in a mode that the row chain pin is ejected and pressed and the row chain pin is dragged in a matched mode. The disassembly time of the pin penetrating type row chain can be shortened, and the labor intensity of disassembly is reduced; the pressing-out piece is driven to push the row chain pin to move axially in a mode of screwing the jacking piece, a traditional mode of knocking the row chain pin is replaced, and the problem that a pin penetrating type row chain is damaged due to too large knocking force can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the field of auxiliary tooling for disassembling parts of tobacco shredding equipment, in particular to a pin-through type chain disassembling device. Background Art

[0002] In the tobacco silk production line, the shredder is an important main machine, and its main task is to cut the processed tobacco leaves and stems into leaf shreds and stem shreds that meet the requirements of the silk production process specifications. The shredder's shredder conveyor is mainly a chain conveyor, including an upper chain, a lower chain and a sprocket for the corresponding chain installation. The upper and lower chains compact the incoming materials from the conveying hopper into "tobacco cakes" according to the set capacity and convey them to the knife gate at different speeds.

[0003] At present, the chain conveyor chain used in the tobacco industry for shredding is usually connected by chain pins. During use, tobacco mud, tobacco oil, dust, etc. accumulate in the pin holes, reducing the mobility of the chain links. Therefore, the chain links need to be disassembled to clean them and lubricate them after cleaning. In the prior art, a slender pin is usually used to abut against the chain pin, and the slender pin is manually knocked out of the chain by a tool. The disassembly efficiency is low, and a lot of manpower and material resources are consumed. In addition, the knocking force is not easy to control, which can easily damage the chain pin and the chain, increasing maintenance costs. Utility Model Content

[0004] One purpose of the utility model is to provide a disassembly device for a through-pin type chain, which can improve the disassembly efficiency of the through-pin type chain, reduce the probability of damage to the through-pin type chain due to disassembly, and reduce maintenance costs.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A pin-penetrating chain disassembly device, wherein the pin-penetrating chain comprises a pin-penetrating chain and a chain pin disposed in the pin-penetrating chain; the pin-penetrating chain disassembly device comprises:

[0007] A support assembly, used for supporting and fixing the pin-through type chain;

[0008] The ejector assembly comprises an extrusion member and a push member, wherein the push member is threadedly connected to the support assembly, one end of the extrusion member abuts against the push member along the axial direction of the push member, and the other end of the extrusion member can be axially movably inserted into the pin hole of the pin chain and abuts against one end of the chain pin in the pin hole;

[0009] A clamping member, wherein the clamping member is capable of clamping the other end of the chain pin;

[0010] A driving assembly is provided, wherein the driving assembly can drive the clamping member to move along the axial direction of the pressing member.

[0011] As an implementable solution of the above-mentioned pin-through type chain removal device, the support assembly includes:

[0012] A support frame, including a support base, for supporting the pin-through chain;

[0013] A pressing member, which is arranged above the support base and can abut against the top surface of the pin-through chain.

[0014] As an implementable solution of the above-mentioned pin-through type chain removal device, the support frame includes a first support side plate and a second support side plate. Along the axial direction of the pressing member, the support base is arranged between the first support side plate and the second support side plate;

[0015] The first support side plate is provided with a first through hole, and the pressing-out member passes through the first through hole; the second support side plate is provided with a second through hole for passing through the chain pin, and the first through hole and the second through hole are coaxially arranged.

[0016] As an implementable solution of the above-mentioned pin-through type chain removal device, one end of the pressing member passes through the first through hole and is threadedly connected to the first through hole, and the other end extends out of the first through hole to form an operation part.

[0017] As an implementable solution of the above-mentioned pin-through type chain removal device, the support assembly further includes a positioning member, and the positioning member is fixed to the support frame;

[0018] The pressing-out member can axially penetrate through the positioning member and enter the pin-through hole. One end of the pressing-out member extends into the pressing member and axially abuts against the pressing member. The pressing member is sleeved outside the positioning member and is threadedly connected to the positioning member.

[0019] As an implementable solution of the above-mentioned pin-through type chain removal device, the upper surface of the support base is provided with a limiting groove that penetrates along the axial direction of the pressing member for placing the pin-through chain.

[0020] As an implementable solution of the above-mentioned pin-through type chain removal device, the pressing member is provided with a pressing groove with an opening facing downwards. The pressing groove and the limiting groove surround and form a through hole for passing through the pin-through chain, and the bottom wall of the pressing groove can contact the outer wall of the pin-through chain.

[0021] As an implementable solution of the above-mentioned pin-through type chain removal device, there are at least two pressing members, and at least two pressing members are spaced apart along the axial direction of the pressing member.

[0022] As an implementable solution of the above-mentioned pin-through type chain removal device, the pressing member is detachably connected to the support frame.

[0023] As an implementable solution of the above-mentioned pin-through type chain removal device, the driving assembly includes:

[0024] A sliding member, and the clamping member is fixed on the sliding member;

[0025] A mounting bracket, the mounting bracket is fixed to the support frame, and the mounting bracket and the sliding member are slidably matched along the axial direction of the pressing member to restrict the sliding member from rotating circumferentially along the chain pin relative to the sliding member;

[0026] A lead screw, the lead screw is in threaded cooperation with the sliding member;

[0027] A driving member, the driving member can drive the lead screw to rotate.

[0028] Beneficial effects:

[0029] For the pin-through type chain removal device proposed by the present utility model, when the pressing member is screwed, the pressing member will move axially and push the pressing-out member to move axially. The pressing-out member will push the chain pin to move axially, so that one end of the chain pin away from the pressing-out member extends out of the pin-through hole. Then, the clamping member clamps one end of the chain pin extending out of the pin-through hole, and then the driving assembly drives the clamping member to move axially, so that the length of the chain pin passing through the pin-through hole gradually increases until the chain pin completely disengages from the pin-through hole.

[0030] For this pin-through type chain removal device, only need to first use the pressing-out member to push out the chain pin for a certain length, and then the driving assembly drives the clamping member to drag the chain pin, realizing the disassembly of the chain by the cooperation of pressing the chain pin and dragging the chain pin, which can shorten the disassembly time of the pin-through type chain and reduce the labor intensity of disassembly; using the method of screwing the pressing member to drive the pressing-out member to push the chain pin to move axially, replacing the traditional method of knocking the chain pin, can effectively solve the problem that the pin-through type chain is damaged due to excessive knocking force. Description of the drawings

[0031] Figure 1 is a schematic structural diagram of the pin-through type chain removal device provided by the present utility model;

[0032] Figure 2 is a schematic structural diagram of the bracket of the pin-through type chain removal device provided by the present utility model;

[0033] Figure 3 is a sectional view of the pin-through type chain removal device provided by the present utility model.

[0034] Wherein:

[0035] 1. Ejection assembly; 11. Pressing-out member; 12. Pressing member;

[0036] 2. Clamping member;

[0037] 3. Driving component; 31. Lead screw; 32. Driving member; 33. Sliding member; 34. Mounting bracket;

[0038] 4. Support component; 41. Support frame; 411. Support base; 412. First support side plate; 4121. First through hole; 413. Second support side plate; 4131. Second through hole; 42. Pressing member; 43. Positioning member; 100. Pin chain; 200. Chain pin. Detailed implementation manner

[0039] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0040] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0041] Unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0043] Embodiment 1

[0044] This embodiment provides a pin-through type chain removal device, which can shorten the removal time of the pin-through type chain, improve the removal efficiency of the pin-through type chain, reduce the probability of damage to the pin-through type chain due to removal, and reduce the maintenance cost.

[0045] Please refer to Figure 1-2 , the pin-through type chain removal device provided in this embodiment includes a support assembly 4, an ejection assembly 1, a clamping member 2 and a driving assembly 3. The support assembly 4 is used to support and fix the pin-through chain 100. The ejection assembly 1 includes an ejection member 11 and a pressing member 12. The pressing member 12 is threadedly connected to the support assembly 4. One end of the ejection member 11 abuts against the pressing member 12 along the axial direction of the pressing member 12. The other end of the ejection member 11 is movably inserted through the pin hole of the pin-through chain 100 along its own axial direction and abuts against one end of the chain pin 200 in the pin hole. The clamping member 2 can clamp the other end of the chain pin 200. The driving assembly 3 can drive the clamping member 2 to move axially along the chain pin 200. Exemplarily, the clamping member 2 adopts a three-jaw chuck.

[0046] Turn the pressing member 12, and the pressing member 12 will move axially and push the ejection member 11 to move axially. The ejection member 11 will push the chain pin 200 to move axially, so that the end of the chain pin 200 away from the ejection member 11 extends out of the pin hole. Then, the clamping member 2 clamps the end of the chain pin 200 extending out of the pin hole, and then the driving assembly 3 drives the clamping member 2 to move axially, so that the length of the chain pin 200 passing through the pin hole gradually increases until the chain pin 200 is completely removed from the pin hole.

[0047] For this pin-through type chain removal device, only need to first use the ejecting member 11 to eject the chain pin 200 for a certain distance, and then the driving assembly 3 drives the clamping member 2 to drag the chain pin 200, realizing the disassembly of the chain by the cooperation of pressing the chain pin 200 and dragging the chain pin 200, which can shorten the removal time of the pin-through type chain and reduce the labor intensity of removal; by using the method of screwing the pressing and jacking member 12 to drive the ejecting member 11 to push the chain pin 200 to move axially, replacing the traditional method of knocking the chain pin 200, it can effectively solve the problem that the pin-through type chain is damaged due to excessive knocking force.

[0048] Specifically, the support assembly 4 includes a support frame 41 and a pressing member 42. The support frame 41 includes a support base 411 for supporting the pin-through chain 100. The pressing member 42 is arranged above the support base 411 and can abut against the top surface of the pin-through chain 100. With such a setting, the pin-through chain 100 can be clamped between the support base 411 and the pressing member 42 in the vertical direction, realizing the pressing and fixing of the pin-through chain 100 in the vertical direction and preventing the pin-through chain 100 from moving synchronously when the ejecting member 11 pushes the chain pin 200.

[0049] Furthermore, the support frame 41 further includes a first support side plate 412 and a second support side plate 413. Along the axial direction of the pressing and jacking member 12, the support base 411 is arranged between the first support side plate 412 and the second support side plate 413; the first support side plate 412 is provided with a first through hole 4121, and the ejecting member 11 passes through the first through hole 4121; the second support side plate 413 is provided with a second through hole 4131 for passing through the chain pin 200, and the first through hole 4121 and the second through hole 4131 are coaxially arranged.

[0050] Setting the first through hole 4121 and the second through hole 4131 coaxially is beneficial to the coaxiality between the chain pin 200, the ejecting member 11, and the second through hole 4131 during the process of the ejecting member 11 ejecting the chain pin 200, so that the end of the chain pin 200 far from the ejecting member 11 can smoothly pass through the second through hole 4131.

[0051] Exemplarily, both the first support side plate 412 and the second support side plate 413 are connected to the support base 411 through fasteners such as bolts. In other embodiments, the first support side plate 412 and the second support side plate 413 can also be fixedly welded to the support base 411.

[0052] Furthermore, the support frame 41 further includes a positioning member 43, and the positioning member 43 is fixed to the support frame 41; the ejecting member 11 can axially penetrate through the positioning member 43 and enter the pin-through hole. One end of the ejecting member 11 can extend into the pressing and jacking member 12 and axially abut against the pressing and jacking member 12. The pressing and jacking member 12 is sleeved outside the positioning member 43 and is threadedly connected to the positioning member 43.

[0053] Since the positioning member 43 is fixed to the support frame 41, when the pressing member 12 is screwed, the pressing member 12 will approach the pin-through chain 100 along the axial direction of the chain pin 200. The pressing member 12 continuously presses the pressing-out member 11, causing the pressing-out member 11 to move along the axial direction of the chain pin 200, so that the pressing-out member 11 presses out the chain pin 200.

[0054] Exemplarily, one end of the positioning member 43 is fixedly welded to the side of the first support side plate 412 facing away from the second support side plate 413.

[0055] Further, an operation part is formed at one end of the pressing member 12 away from the pressing-out member 11, and an anti-slip structure is provided on the outer peripheral wall of the operation part, which is convenient for the user to manually screw the operation part. In other embodiments, the operation part can also be set as a structure that cooperates with a wrench to screw the pressing member 12 through the wrench.

[0056] Further, please refer to Figure 1 , since the chain pin 200 may be bent due to the force during the pressing process, in order to keep the pin-through chain 100 in a straightened state during the pressing process, a support groove is formed on the upper surface of the support base 411 and penetrates along the axial direction of the pressing member 12 for placing the pin-through chain 100. The pin-through chain 100 is placed in the support groove, and then the pin-through chain 100 is pressed by the pressing member 42 on the top surface, so that the pin-through chain 100 is pressed between the bottom wall of the support groove and the pressing member 42, which is beneficial to keeping the pin-through chain 100 in a straightened state during the pressing process without bending and other deformations, and making it easy for the pressing-out member 11 to press out the chain pin 200.

[0057] Further, please refer to Figure 1 , in order to improve the pressing effect of the pressing member 42 on the pin-through chain 100, at least two pressing members 42 are provided, and at least two pressing members 42 are distributed at intervals along the axial direction of the pressing member 12. In this embodiment, two pressing members 42 are provided, and the two pressing members 42 are arranged at both ends of the support base 411 along the axial direction of the pressing member 12. The two ends of the pin-through chain 100 are pressed between the bottom wall of the support groove and the pressing member 42, and the pin-through chain 100 remains in a straightened state during the disassembly process. In other embodiments, three, or four, or more pressing members 42 can also be provided.

[0058] Further, please refer to Figure 1 , the pressing member 42 is detachably connected to the support frame 41. Specifically, taking the example of setting two pressing members 42, the two pressing members 42 are detachably connected to the two support side plates one by one. It should be noted that in other embodiments, when the number of the pressing members 42 is more than two, the pressing members 42 between the two pressing members 42 at the ends are detachably connected to the support base 411.

[0059] By detachably connecting the support frame 41 and the pressing member 42, it is convenient to replace different pin-through chain rows 100, so that the pin-through chain row disassembly device provided in this embodiment can be adapted to different pin-through chain rows 100. Specifically, in this embodiment, the pressing member 42 and the support frame 41 are connected by fasteners such as bolts. In other embodiments, magnets can also be installed on the pressing member 42 and the support frame 41, and the pressing member 42 and the support frame 41 can be detachably connected by magnetic attraction.

[0060] Further, please refer to Figure 1 , to improve the pressing effect of the pressing member 42 on the pin-through chain row 100 and limit the movement of the pin-through chain row 100, the pressing member 42 is provided with a pressing groove with an opening facing downwards. The pressing groove and the support groove enclose a through hole for passing through the pin-through chain row 100, and the bottom wall of the pressing groove can contact the outer wall of the pin-through chain row 100. With such a setting, the pin-through chain row 100 can be better positioned in the support groove to limit the shaking of the pin-through chain row 100. And by coaxially arranging the through hole and the first through hole 4121, it is convenient for the pressing member 11 to press the chain pin 200 out of the pin-through chain row 100 and pass through the second through hole 4131. Exemplarily, the through hole and the first through hole 4121 are coaxially arranged, which is beneficial for the pin-through chain row 100 to maintain a straightened state.

[0061] Further, please refer to Figure 1 , the clamping member 2 includes a lead screw 31, a driving member 32, a sliding member 33 and a mounting bracket 34. The clamping member 2 is fixed on the sliding member 33. The sliding member 33 is in threaded cooperation with the lead screw 31. The mounting bracket 34 is fixed to the support frame 41. The mounting bracket 34 and the sliding member 33 are slidably matched along the axial direction of the pressing member 12 to limit the circumferential rotation of the sliding member 33 relative to the sliding member 33. The driving member 32 can drive the lead screw 31 to rotate. Specifically, the driving member 32 is a pneumatic wrench.

[0062] Since the mounting bracket 34 and the sliding member 33 are slidably matched along the axial direction of the chain pin 200, restricting the circumferential rotation of the sliding member 33 along the chain pin 200, during the process of the driving member 32 driving the lead screw 31 to rotate, the sliding member 33 will move axially along the chain pin 200 relative to the mounting bracket 34.

[0063] Further, please refer to Figure 2 , the aperture of the second through hole 4131 is larger than the diameter of the chain pin 200. By making the aperture of the second through hole 4131 larger than the diameter of the chain pin 200, the chain pin 200 can smoothly pass through the second through hole 4131 after being pressed.

[0064] Please refer to Figure 1-2 , the specific working process of the pin-through chain row disassembly device provided in this embodiment is as follows:

[0065] S1. Place the pin-through chain 100 in the support groove of the support base 411, and connect the pressing member 42 to the support frame 41 to clamp the pin-through chain 100 between the bottom wall of the support groove and the pressing member 42;

[0066] S2. Pass one end of the pressing member 11 through the positioning member 43, the first through hole 4121 in sequence and abut against one end of the chain pin 200. Sleeve the pressing member 12 outside the positioning member 43. Screw the pressing member 12, and the pressing member 12 will push the pressing member 11 to move axially. The pressing member 11 will push the chain pin 200 to move axially, so that the end of the chain pin 200 away from the pressing member 11 passes through the second through hole 4131 and extends out;

[0067] S3. Clamp one end of the chain pin 200 passing through the second through hole 4131 by the clamping member 2, and drive the lead screw 31 to rotate by the driving member 32, so that the sliding member 33 drives the clamping member 2 to move axially away from the support side plate along the chain pin 200 until the chain pin 200 is completely pulled out of the pin-through chain 100.

[0068] Embodiment 2

[0069] Please refer to Figure 3 , the difference between this embodiment and Embodiment 1 is that the positioning member 43 in Embodiment 1 is cancelled. The first through hole 4121 on the first support side plate 412 is a threaded hole. One end of the constant pressure member is inserted into the first through hole 4121 and is threadedly connected to the first through hole 4121, and the other end extends out of the first through hole 4121 to form an operation part.

[0070] Specifically, one end of the pressing member 11 extends into the pressing member 12 and axially abuts against the pressing member 12. Screw the pressing member 12, and the pressing member 12 will move axially to approach the chain pin 200. The pressing member 11 will move axially under the pushing action of the pressing member 12, so that the pressing member 11 will pass the other end of the chain pin 200 out of the second through hole 4131.

[0071] Furthermore, please refer to Figure 3 , to avoid that during the pressing process, the pressing member 11 is prone to bending under the pressing due to its too long length. The length of the chain pin 200 is L1, and the length of the pressing member 11 is L2, L1≥5L2. Since the length of the pressing member 11 is shorter, the stiffness of the pressing member 11 is improved, and the pressing member 11 is not easy to bend during the pressing process, avoiding damage to the chain pin 200 and the pin-through chain 100.

[0072] To avoid that the length of one end of the chain pin 200 passing through the pin-through chain 100 is insufficient due to only one pressing, the pressing member 11 with different lengths can be replaced, and two or more sections of the pressing member 11 can also be axially abutted in sequence.

[0073] The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, based on the idea of the present utility model, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation on the present utility model.

Claims

1. A pin-through type chain removal device, the pin-through type chain including a pin-through chain (100) and a chain pin (200) inserted into the pin-through chain (100); characterized in that, The pin-through type chain removal device includes: A support assembly (4) for supporting and fixing the pin-through type chain; An ejecting assembly (1), including an ejecting member (11) and a pressing member (12). The pressing member (12) is threadedly connected to the support assembly (4). One end of the ejecting member (11) axially abuts against the pressing member (12) along the axial direction of the pressing member (12). The other end of the ejecting member (11) is axially movably inserted into the pin hole of the pin-through chain (100) and abuts against one end of the chain pin (200) in the pin hole; A clamping member (2) capable of clamping the other end of the chain pin (200); A driving assembly (3) capable of driving the clamping member (2) to move axially along the pressing member (12).

2. The pin-through type chain removal device according to claim 1, characterized in that The support assembly (4) includes: A support frame (41), including a support base (411) for supporting the pin-through chain (100); A pressing member (42) disposed above the support base (411), and the pressing member (42) can abut against the top surface of the pin-through chain (100).

3. The pin-through type chain removal device according to claim 2, wherein, The support frame (41) further includes a first support side plate (412) and a second support side plate (413). Along the axial direction of the pressing member (12), the support base (411) is disposed between the first support side plate (412) and the second support side plate (413); The first support side plate (412) is provided with a first through hole (4121), and the ejecting member (11) is inserted through the first through hole (4121); the second support side plate (413) is provided with a second through hole (4131) for passing through the chain pin (200), and the first through hole (4121) and the second through hole (4131) are coaxially arranged.

4. The pin-through type chain removal device according to claim 3, characterized in that, One end of the pressing member (12) is inserted into the first through hole (4121) and is threadedly connected to the first through hole (4121), and the other end extends out of the first through hole (4121) to form an operation part.

5. The pin-through type chain removal device according to claim 2, characterized in that, The support assembly (4) further includes a positioning member (43) fixed to the support frame (41); The ejecting member (11) can axially penetrate through the positioning member (43) and enter the pin hole. One end of the ejecting member (11) extends into the pressing member (12) and axially abuts against the pressing member (12). The pressing member (12) is sleeved outside the positioning member (43) and is threadedly connected to the positioning member (43).

6. The pin-through type chain removal device according to claim 2, wherein, The upper surface of the support base (411) is provided with a limiting groove axially penetrating along the pressing member (12) for placing the pin-through chain (100).

7. The pin-through type chain removal device according to claim 6, wherein, The pressing member (42) is provided with a pressing groove with an opening facing downwards. The pressing groove and the limiting groove enclose a through hole for passing through the pin-through chain (100), and the bottom wall of the pressing groove can contact the outer wall of the pin-through chain (100).

8. The pin-through type chain removal device according to claim 6, characterized in that, At least two pressing members (42) are provided, and the at least two pressing members (42) are distributed at intervals along the axial direction of the pressing member (12).

9. The pin-through type chain removal device according to claim 7, wherein The pressing member (42) is detachably connected to the support frame (41).

10. The pin-through type chain removal device according to claim 2, characterized in that, The driving assembly (3) includes: A sliding member (33), and the clamping member (2) is fixed on the sliding member (33); A mounting bracket (34), the mounting bracket (34) is fixed to the support frame (41), and the mounting bracket (34) and the sliding member (33) are slidably matched along the axial direction of the pressing member (12) to limit the sliding member (33) from rotating circumferentially relative to the sliding member (33) along the row chain pin (200); A lead screw (31), the lead screw (31) is in threaded cooperation with the sliding member (33); A driving member (32), the driving member (32) can drive the lead screw (31) to rotate.

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