Sword shuttle of silk screen textile machine

Abstract

The rapier shuttle comprises a first shuttle body and a second shuttle body, the first shuttle body comprises a first installation base, an installation groove is formed in one end of the first installation base, an abutting block is fixedly connected into the installation groove, limiting blocks are symmetrically and fixedly connected to the inner wall of the installation groove, and the abutting block and the limiting blocks are connected with the second shuttle body in a limiting mode; wire clamping assemblies are arranged on the top face and the bottom face of the abutting block correspondingly and hinged to the opposite side walls of the mounting groove correspondingly. The end, away from the abutting block, of the wire clamping assembly is in transmission connection with a driving assembly, the driving assembly is fixedly connected with the inner wall of the mounting groove, one end of the driving assembly is fixedly connected with a connecting rod, one end of the connecting rod is fixedly connected with a balancing weight, and the balancing weight is slidably connected with the first mounting base. Through the cooperation of the thread clamping assembly and the thread hanging mechanism, the weft tension is stable at the connection moment of the first shuttle and the second shuttle, and the knitting precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of silk screen weaving, in particular to a sword shuttle of a silk screen weaving machine. Background Art

[0002] The rapier loom is the predominant type of shuttleless loom, using a rapier mechanism for weft insertion. Its core structures are categorized into three types: single rapier, double rapier, and double-layer rapier. The double rapier configuration is the mainstream due to its lightweight and efficient nature, as it features a rapier mechanism that coordinates weft insertion with a sender and a receiving rapier. With double rapier weft insertion, rapiers and corresponding rapier transfer mechanisms are installed on both sides of the loom. These two rapiers are called the sender and receiving rapiers, respectively. During weft insertion, the sender and receiving rapiers move from opposite sides of the machine toward the center of the shed. The weft yarn is first grasped by the sender and brought to the center of the shed, where the two rapiers meet. The sender and receiving rapiers then retract, transferring the weft yarn from the sender to the receiving rapier during this initial retraction process. The receiving rapier then pulls the weft yarn through the shed.

[0003] The existing rapier loom can only shuttle a single weft thread, which makes the woven product monotonous, and the existing weaving of several weft threads cannot achieve the function of intertwining and laying several weft threads, making it difficult to improve the weaving strength of the weft threads. Therefore, it is necessary to design a rapier shuttle for a silk screen loom to solve the above problems. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention proposes a wire mesh textile machine sword shuttle, which can achieve stable weft tension at the moment of handover between the first shuttle and the second shuttle through the cooperation of the wire clamping component and the wire hanging mechanism, thereby improving weaving accuracy.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A sword shuttle of a silk screen textile machine comprises a first shuttle and a second shuttle, the first shuttle comprising a first mounting seat, a mounting groove being provided at one end of the first mounting seat, an abutment block being fixedly connected in the mounting groove, a limit block being symmetrically fixedly connected to the inner wall of the mounting groove, the abutment block and the limit block being respectively limit-connected to the second shuttle; a wire clamping assembly is respectively provided on the top and bottom surfaces of the abutment block, and the wire clamping assemblies are respectively hinged to the opposite side walls of the mounting groove; the wire clamping assembly is transmission-connected to a driving assembly at one end away from the abutment block, the driving assembly is fixedly connected to the inner wall of the mounting groove, one end of the driving assembly is fixedly connected to a connecting rod, one end of the connecting rod is fixedly connected to a counterweight, and the counterweight is slidably connected to the first mounting seat.

[0007] Preferably, the wire clamping assembly includes two clamping blocks, one end of the two clamping blocks is hinged to the inner wall of the mounting groove respectively, and elastic clips are embedded and fixedly connected inside the two clamping blocks, and the middle part of the elastic clip extends out of one end face of the clamping block and is transmission-connected to the driving assembly; a blocking clip is embedded and fixedly connected at one end of the clamping block away from the driving assembly; the blocking clip is aligned with the abutment block up and down.

[0008] Preferably, the driving assembly includes a guide rod, and the upper and lower ends of the guide rod are respectively sleeved and slidably connected with slip rings, the outer side of the slip ring is fixedly connected with a hinge seat, the hinge seat is hinged with a transmission rod, the end face of the transmission rod is fixedly connected with an extension plate, and a hinge shaft is hinged between the two extension plates, and the two ends of the hinge shaft are respectively fixedly connected to the inner wall of the mounting groove; one end of the two extension plates is fixedly connected with a first spring sheet, the first spring sheet is an arc-shaped structure, and the side surface of the first spring sheet is fixedly connected to the other end of the connecting rod.

[0009] Preferably, guide plates are provided at both ends of the guide rod, and a waist-shaped oblong hole is provided on the top surface of the guide plate. The two ends of the guide rod respectively pass through the oblong hole and are slidably connected to the oblong hole; the inner wall of one end of the oblong hole is fitted with the outer surface of the guide rod; the two ends of the guide rod are respectively fixedly connected with end heads, and the end heads are in sliding contact with the guide plate.

[0010] Preferably, an arc-shaped groove is provided on a side of the abutment block away from the driving assembly, and a gap is provided between a line connecting the two retaining clips and the groove.

[0011] Preferably, the second shuttle includes a second mounting seat, a mounting hole is opened on the side of the second mounting seat, a motor is fixedly connected in the mounting hole, the output shaft of the motor is fixedly connected to a turntable, the end face of the turntable is fixedly connected to a support rod, one end of the support rod is fixedly connected to a fixed half ring, and the two ends of the fixed half ring are respectively hinged with a first claw and a second claw; one end of the first claw and one end of the second claw are arranged to conflict with each other; a clamping assembly is fixedly connected between the other end of the first claw and the other end of the second claw, and the two ends of the clamping assembly respectively pass through the first claw, the second claw, the fixed half ring and are connected to the limit block.

[0012] Preferably, the clamping assembly includes a limiting rod, a pull rod is fixedly connected to the middle part of the limiting rod, one end of the pull rod is fixedly connected to a second spring piece, the two ends of the second spring piece are respectively fixedly connected to the first claw and the second claw, and the outer side surfaces of the second spring piece are respectively fitted with the first claw and the second claw; the other end of the first claw, the other end of the second claw and the two ends of the fixed half ring are respectively provided with through grooves, and the two ends of the limiting rod are in sliding contact with the through grooves.

[0013] Preferably, a slide groove is provided at the other end of the first mounting seat, and the slide groove is adapted to and slidably connected to the counterweight block.

[0014] Compared with the prior art, the present invention has the following advantages and technical effects:

[0015] Through the coordination of the first and second shuttles, the present invention enables the first shuttle to pull the mesh wire used for weaving to the center of the loom and transfer it to the second shuttle. This reduces the time required to lay the weft in the shuttle weaving process by half, thereby improving the efficiency of textile processing. Simultaneously, when the first shuttle is activated by the transmission mechanism, it utilizes a high acceleration to separate the wire clamping assembly, clamping the mesh wire and delivering it to the other side of the loom. Simultaneously, the second shuttle, driven by the transmission mechanism, moves synchronously toward the first shuttle, transferring the mesh wire held by the first shuttle to the second shuttle. As the second shuttle retreats, the weft wire is laid.

[0016] The second shuttle of the present invention can drive the turntable to rotate through the motor, thereby realizing the mutual entanglement of a plurality of weft threads, which not only enhances the strength of the textile net, but also improves the regularity of the weft threads, thereby improving the efficiency and quality of the textiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0018] Figure 1 This is a schematic side view of the three-dimensional structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the first shuttle;

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the clamping block from a side view;

[0021] Figure 4 1 is a schematic diagram of the three-dimensional structure of the second shuttle from a side view;

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the clamping assembly and the abutment block from a side view.

[0023] Among them, 1. first mounting seat; 2. mounting groove; 3. abutment block; 4. limiting block; 5. connecting rod; 6. counterweight block; 7. clamping block; 8. elastic clip; 9. retaining clip; 10. guide rod; 11. slip ring; 12. transmission rod; 13. extension plate; 14. hinge shaft; 15. first spring piece; 16. guide plate; 17. oblong hole; 18. end; 19. groove; 20. second mounting seat; 21. motor; 22. turntable; 23. support rod; 24. fixed half ring; 25. first clamping claw; 26. second clamping claw; 27. limiting rod; 28. pull rod; 29. second spring piece; 30. slide groove. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] It should be noted that all components in the technical solution of this application require necessary additional facilities for water supply, oil supply, electricity supply and gas supply for driving and / or control. If there is no further explanation, it is assumed that the existing technology is used and equipped, and no special explanation is required.

[0026] It should be noted that, in order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Depend on Figure 1-4 The illustrated embodiment is a rapier shuttle for a silk screen weaving machine, which is a shuttle weaving machine and includes a first shuttle and a second shuttle. The first shuttle and the second shuttle are driven by a transmission mechanism of the weaving machine to weave the weft yarn of the weaving machine. The weaving machine also includes a thread supply assembly that can place the weft yarn at the front end of the first shuttle for easy pickup by the first shuttle. The first shuttle includes a first mounting seat 1, one end of which is provided with a mounting slot 2, an abutment block 3 fixedly connected to the mounting slot 2, and a limit block 4 symmetrically fixedly connected to the inner wall of the mounting slot 2. The abutment block 3 and the limit block 4 are respectively connected to the second shuttle in a limit manner; the top and bottom surfaces of the abutment block 3 are respectively provided with a thread clamping assembly, which is hinged to the opposite side walls of the mounting slot 2; the end of the thread clamping assembly away from the abutment block 3 is connected to a drive assembly, which is fixedly connected to the inner wall of the mounting slot 2, and one end of the drive assembly is fixedly connected to a connecting rod 5, and one end of the connecting rod 5 is fixedly connected to a counterweight 6, which is slidably connected to the first mounting seat 1.

[0028] Furthermore, the number of the mounting grooves 2 opened at one end of the first mounting seat 1 is set to be several, and the mounting components in the mounting grooves 2 are all the same, so that several weft threads can be laid out at the same time.

[0029] A further optimized solution is that the wire clamping assembly includes two clamping blocks 7, one end of each of which is hinged to the inner wall of the mounting groove 2. An elastic clip 8 is embedded and fixedly connected inside the two clamping blocks 7. The elastic clip 8 is a U-shaped clip, and both ends of the elastic clip 8 are embedded inside the clamping blocks 7 and integrally formed with them. Furthermore, the clamping blocks 7 are made of elastic rubber material and can clamp the weft thread under the clamping of the elastic clip 8. The middle part of the elastic clip 8 extends out from one end face of the clamping block 7 and is transmission-connected to the drive assembly; a retaining clip 9 is embedded and fixedly connected at the end of the clamping block 7 away from the drive assembly; the retaining clip 9 is aligned vertically with the abutment block 3. The retaining clip 9 is made of elastic rubber material and has a U-shaped structure. The elastic force of the retaining clip 9 can pre-tighten the top of the clamping block 7, thereby improving the firmness of the weft thread clamping. That is, an arc-shaped groove 19 is opened on the side of the abutment block 3 away from the drive assembly, and a gap is set between the line connecting the two retaining clips 9 and the groove 19.

[0030] Furthermore, the counterweight block 6 is a solid metal block, and the instantaneous pulling force generated by its weight can be greater than the sum of the clamping forces of pushing open the elastic clamp 8 and the retaining clamp 9, making it easier for the clamping block 7 to clamp the weft.

[0031] Furthermore, a gap is provided between the outer side surface of the clamping block 7 and the side wall of the installation groove 2 to facilitate the opening of the two clamping blocks 7 under the drive of the elastic clamp 8 .

[0032] A further optimized solution is provided, in which the driving assembly includes a guide rod 10, and the upper and lower ends of the guide rod 10 are respectively sleeved and slidably connected with a slip ring 11, the outer side of the slip ring 11 is fixedly connected with a hinge seat, the hinge seat is hinged with a transmission rod 12, the end face of the transmission rod 12 is fixedly connected with an extension plate 13, and a hinge shaft 14 is hinged between the two extension plates 13, and the two ends of the hinge shaft 14 are respectively fixedly connected to the inner wall of the mounting groove 2; one end of the two extension plates 13 is fixedly connected with a first spring piece 15, the first spring piece 15 is an arc-shaped structure, and the side of the first spring piece 15 is fixedly connected to the other end of the connecting rod 5. The counterweight block 6 pulls the first spring piece 15 through the connecting rod 5, and the two ends of the first spring piece 15 shrink. The scissor-shaped structure formed by the hinge shaft 14 and the extension plate 13 is used to drive the transmission rod 12 to drive the slip rings 11 to approach each other, and then drive the guide rod 10 to push the elastic clamp 8 to drive the clamping block 7 to open a certain angle to accommodate the weft thread. At the same time, the U-shaped part of the retaining clamp 9 limits the depth of the weft thread entering the clamping block 7, maintaining the gap between the weft thread and the groove 19, which is convenient for the second shuttle to hang the thread.

[0033] A further optimized solution is provided with guide plates 16 at each end of the guide rod 10. A waist-shaped oblong hole 17 is defined on the top surface of the guide plate 16. Both ends of the guide rod 10 extend through the oblong hole 17 and are slidably connected thereto. The inner wall of one end of the oblong hole 17 is aligned with the outer surface of the guide rod 10. End caps 18 are fixedly connected to each end of the guide rod 10, and the end caps 18 are in slidable contact with the guide plates 16. The oblong holes 17 both limit and guide the guide rod 10, optimizing the travel of the guide rod 10 and avoiding the problem of insufficient driving force for the guide rod 10.

[0034] In a further optimized solution, the second shuttle includes a second mounting base 20, with a mounting hole formed on the side of the second mounting base 20. A motor 21 is fixedly connected to the mounting hole. A turntable 22 is fixedly connected to the output shaft of the motor 21. A support rod 23 is fixedly connected to the end face of the turntable 22. Furthermore, the number of support rods 23 is the same as the number of abutment blocks 3. One end of the support rod 23 is fixedly connected to a fixed half ring 24, and the two ends of the fixed half ring 24 are respectively hinged to a first claw 25 and a second claw 26; one end of the first claw 25 and one end of the second claw 26 are arranged to abut against each other; a clamping assembly is fixedly connected between the other end of the first claw 25 and the other end of the second claw 26. The two ends of the clamping assembly respectively pass through the first claw 25, the second claw 26, and the fixed half ring 24, and are connected to the limit block 4 for limiting.

[0035] A further optimized solution is that the clamping assembly includes a limit rod 27, a pull rod 28 is fixedly connected to the middle of the limit rod 27, one end of the pull rod 28 is fixedly connected to the second spring piece 29, the two ends of the second spring piece 29 are respectively fixedly connected to the first claw 25 and the second claw 26, and the outer side surfaces of the second spring piece 29 are respectively fitted with the first claw 25 and the second claw 26; the other end of the first claw 25, the other end of the second claw 26 and the two ends of the fixed half ring 24 are respectively provided with through grooves, and the two ends of the limit rod 27 are in sliding contact with the through grooves.

[0036] Furthermore, the position of the limit block 4 is such that when the limit rod 27 contacts the limit block 4, the weft thread can pass through the opening of the first claw 25 and the second claw 26, and be placed between the second elastic piece 29, the first claw 25, and the second claw 26. At this time, the limit rod 27 will abut against the limit block 4, causing the limit rod 27 to pull the second elastic piece 29 to deform, causing the contact ends of the first claw 25 and the second claw 26 to separate, and the first claw 25 and the second claw 26 to penetrate into the side wall of the groove 19 near the guide rod 10. When the first shuttle and the second shuttle separate, the above action is reversed, and the second elastic piece 29, the first claw 25, and the second claw 26 retreat to clamp the weft thread firmly, making it easier to pull.

[0037] Furthermore, the joint between the first clamping claw 25 and the second clamping claw 26 is staggered from the weft thread by half of the stroke of the first clamping claw 25, which can reduce the probability of the weft thread coming off when the second shuttle clamps the weft thread.

[0038] As a further optimization solution, a slide groove 30 is provided at the other end of the first mounting seat 1 , and the slide groove 30 is adapted to and slidably connected to the counterweight 6 .

[0039] The working process of this embodiment is as follows:

[0040] If the first and second shuttles of the present invention are used to supply a single weft thread, the textile machine transmission mechanism first drives the first and second shuttles in reciprocating motion, and the thread supply assembly places the weft thread at the front end of the movable mounting slot 2 at the front end of the first shuttle. When the first shuttle is running, the counterweight 6 generates an instantaneous backward pulling force due to inertia, which pulls the first spring plate 15 of the drive assembly to contract via the connecting rod 5. The scissor-shaped transmission structure formed by the hinge shaft 14 and the extension plate 13 drives the slip ring 11 to slide toward each other on the guide rod 10. The guide rod 10 then pushes the elastic clamp 8 to open the clamping block 7 to a certain angle. At this point, the weft thread enters the gap between the clamping block 7 and the abutment block 3, and the retaining clamp 9 uses its elastic preload to initially limit the weft thread. Furthermore, when the acceleration experienced by the first shuttle decreases, the counterweight 6 gradually retracts, and the elastic clamp 8 and clamping block 7 move in opposite directions, thus firmly clamping the weft thread. The retaining clamp 9 can realize that even when the acceleration of the first shuttle is insufficient, the weft thread can be forcibly incorporated into the clamping surface of the clamping block 7 by utilizing the clamping force of the retaining clamp 9 on the clamping block 7, thereby clamping the weft thread.

[0041] At the same time, the second shuttle drives the support rod 23 and the fixed half ring 24 to move. When the limit rod 27 contacts the limit block 4 of the first shuttle, the limit rod 27 is abutted and pulls the second spring piece 29 to deform, causing the first and second claws 25 and 26 to open and extend into the groove 19 of the abutment block 3 of the first shuttle to hook the weft. When the first and second shuttles separate, the tension of the counterweight block 6 disappears, and the clamping block 7 clamps the weft under the combined action of the elastic clamp 8 and the retaining clamp 9. At the same time, the second spring piece 29 returns to its original position, driving the first and second claws 25 and 26 to close, firmly clamping the weft to the fixed half ring 24 of the second shuttle, completing the weft connection.

[0042] When the number of weft threads is set to greater than one, a corresponding number of mounting slots 2 are provided, enabling the simultaneous arrangement and transmission of multiple weft threads. The motor 21 drives the turntable 22, which in turn drives the support rods 23. The rotation of the turntable 22 causes the support rods 23 to rotate, twisting the multiple weft threads into a single strand. This not only enhances the strength of the weft threads but also facilitates weaving on the textile machine. The oblong holes 17 at each end of the guide rod 10 optimize the drive stroke, ensuring the synchronization and stability of the multi-thread clamping action. Ultimately, the first and second shuttles, driven by the transmission mechanism, alternate in motion, achieving continuous weaving of the weft threads.

[0043] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A silk screen weaving machine sword shuttle, characterized in that: The invention comprises a first shuttle and a second shuttle, wherein the first shuttle comprises a first mounting seat (1), a mounting groove (2) is provided at one end of the first mounting seat (1), an abutting block (3) is fixedly connected in the mounting groove (2), a limiting block (4) is symmetrically fixedly connected to the inner wall of the mounting groove (2), and the abutting block (3) and the limiting block (4) are respectively connected to the second shuttle; a clamping assembly is respectively provided on the top and bottom surfaces of the abutting block (3), and the clamping assembly is respectively hinged to the opposite side walls of the mounting groove (2); the clamping assembly is transmission-connected to a driving assembly at one end away from the abutting block (3), and the driving assembly is fixedly connected to the inner wall of the mounting groove (2); one end of the driving assembly is fixedly connected to a connecting rod (5), and one end of the connecting rod (5) is fixedly connected to a counterweight (6), and the counterweight (6) is slidably connected to the first mounting seat (1).

2. The silk screen spinning machine rapier shuttle according to claim 1, characterized in that: The wire clamping assembly comprises two clamping blocks (7), one end of each of the two clamping blocks (7) is hinged to the inner wall of the mounting groove (2), and an elastic clip (8) is embedded in and fixedly connected to the inside of the two clamping blocks (7), and the middle part of the elastic clip (8) extends out of one end face of the clamping block (7) and is transmission-connected to the driving assembly; a retaining clip (9) is embedded in and fixedly connected to the end of the clamping block (7) away from the driving assembly; and the retaining clip (9) is aligned with the abutting block (3) in the upper and lower directions.

3. The silk screen spinning machine rapier shuttle according to claim 2, characterized in that: The driving assembly includes a guide rod (10), wherein the upper and lower ends of the guide rod (10) are respectively sleeved and slidably connected with a slip ring (11), the outer side surface of the slip ring (11) is fixedly connected with a hinge seat, the hinge seat is hinged with a transmission rod (12), the end surface of the transmission rod (12) is fixedly connected with an extension plate (13), a hinge shaft (14) is hinged between the two extension plates (13), and the two ends of the hinge shaft (14) are respectively fixedly connected to the inner wall of the installation groove (2); one end of the two extension plates (13) is fixedly connected with a first elastic piece (15), the first elastic piece (15) is an arc-shaped structure, and the side surface of the first elastic piece (15) is fixedly connected to the other end of the connecting rod (5).

4. The silk screen weaving machine rapier shuttle according to claim 3, characterized in that: The guide rod (10) is provided with a guide plate (16) at both ends, and a waist-shaped oblong hole (17) is provided on the top surface of the guide plate (16). The two ends of the guide rod (10) respectively pass through the oblong hole (17) and are slidably connected to the oblong hole (17); the inner wall of one end of the oblong hole (17) is fitted with the outer side surface of the guide rod (10); the two ends of the guide rod (10) are fixedly connected with an end head (18), and the end head (18) is in sliding contact with the guide plate (16).

5. The silk screen spinning machine rapier shuttle according to claim 2, characterized in that: An arc-shaped groove (19) is provided on a side of the abutment block (3) away from the driving assembly, and a gap is provided between the connecting line of the two retaining clips (9) and the groove (19).

6. The silk screen spinning machine rapier shuttle according to claim 1, characterized in that: The second shuttle comprises a second mounting seat (20), a mounting hole is provided on the side of the second mounting seat (20), a motor (21) is fixedly connected in the mounting hole, an output shaft of the motor (21) is fixedly connected to a turntable (22), an end face of the turntable (22) is fixedly connected to a support rod (23), one end of the support rod (23) is fixedly connected to a fixed half ring (24), two ends of the fixed half ring (24) are respectively hinged with a first clamping claw (25) and a second clamping claw (26); one end of the first clamping claw (25) and one end of the second clamping claw (26) are arranged to contact each other; a clamping assembly is fixedly connected between the other end of the first clamping claw (25) and the other end of the second clamping claw (26), and the two ends of the clamping assembly respectively pass through the first clamping claw (25), the second clamping claw (26), and the fixed half ring (24) and are limitedly connected to the limit block (4).

7. The rapier shuttle for a screen weaving machine according to claim 6, characterized in that: The clamping assembly includes a limiting rod (27), a pull rod (28) is fixedly connected to the middle of the limiting rod (27), one end of the pull rod (28) is fixedly connected to a second spring piece (29), the two ends of the second spring piece (29) are respectively fixedly connected to the first clamping claw (25) and the second clamping claw (26), and the outer side surfaces of the second spring piece (29) are respectively in contact with the first clamping claw (25) and the second clamping claw (26); the other end of the first clamping claw (25), the other end of the second clamping claw (26) and the two ends of the fixed half ring (24) are respectively provided with through grooves, and the two ends of the limiting rod (27) are in sliding contact with the through grooves.

8. The silk screen spinning machine rapier shuttle according to claim 1, characterized in that: The other end of the first mounting seat (1) is provided with a sliding groove (30), and the sliding groove (30) is adapted to and slidably connected to the counterweight (6).

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