Quick replacement structure of drawing machine tower wheel

Abstract

The utility model discloses a quick replacement structure of wire drawing machine tower wheel relates to operation technical field. Quick replacement structure of wire drawing machine tower wheel, including base and second guide pulley subassembly, is provided with the limiting component on the base, and the limiting component includes air cylinder, second support frame, tower wheel, sliding mounting seat and four limit fixed blocks, and the air cylinder fixed mounting is in the upper surface of second support frame, and second support frame fixed mounting is on the support plate outer wall of base, and the outer wall of tower wheel both ends pivot is contacted with the inside corresponding of sliding mounting seat lower end both sides recess, and through the fixed bolt of loosening in limiting component, removes limit fixed block, makes fixed mounting seat and sliding mounting seat separate, and simultaneously, the air cylinder starts, and its output end drives sliding mounting seat and slides upward along the T type piece groove of second support frame inner wall, thereby lifts tower wheel, makes it separate work position, and conveniently carries out the replacement operation, and this effectively improved the maintenance and overhauling efficiency of tower wheel, improved the practicality and flexibility of equipment simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of work technology, and in particular to a quick-change structure for the tower wheel of a wire drawing machine. Background Technology

[0002] An electric wire is a conductor that transmits electrical energy. It mainly consists of an internal conductive core and an external insulating layer. Chinese utility model patent, authorization announcement number "CN222659666U", discloses a wire drawing machine for wire production, including a base. A fixed frame is located at the rear end of the top of the base. A first wire drawing wheel is movably connected to the middle position of one side of the front end of the fixed frame. A third wire drawing wheel is movably connected to the middle position of the other side of the front end of the fixed frame. A second wire drawing wheel is located at the middle position of the front end of the fixed frame. By setting a tension adjustment component between the outer side of the second wire drawing wheel and the front end of the fixed frame, the height of the second wire drawing wheel at the front end of the fixed frame is adjusted by a lifting electric cylinder during use. This extends the stroke of the wire core passing through the wire drawing wheels and adjusts the tension of the second wire drawing wheel applied to the wire core, achieving the effect of adjusting the wire drawing thickness as required. Furthermore, when the second wire drawing wheel is lifted, a limit slider slides within a stable guide groove to prevent the second wire drawing wheel from deflecting and affecting the normal wire drawing process. The design is highly feasible.

[0003] The above technical solution uses a tension adjustment component between the outer side of the second drawing wheel and the front end of the fixed frame. During use, a lifting cylinder is used to adjust the height of the second drawing wheel at the front end of the fixed frame, thereby extending the travel of the wire core through the drawing wheels and adjusting the tension of the second drawing wheel on the wire core to achieve the effect of adjusting the drawing thickness as required. However, the above technical solution still has certain drawbacks. For example, although the device uses a lifting cylinder to adjust the height of the second drawing wheel at the front end of the fixed frame to extend the travel of the wire core through the drawing wheels, when the second drawing wheel needs maintenance and repair after long-term use, workers need to use special tools to disassemble the entire tensioning component before disassembling the second drawing wheel. This operation is complicated and difficult, which reduces the efficiency of maintenance and repair of the second drawing wheel and increases the workload of workers. Utility Model Content

[0004] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a quick-change structure for the tower wheel of a wire drawing machine. This structure can solve the problem that the equipment can adjust the height of the second wire drawing wheel at the front end of the fixed frame by driving the lifting electric cylinder, thereby extending the stroke of the wire core passing through the wire drawing wheel. However, when the second wire drawing wheel needs to be maintained and repaired after long-term use, the staff needs to use special tools to disassemble the entire tensioning assembly before disassembling the second wire drawing wheel. This operation is complicated and difficult, which reduces the efficiency of maintenance and repair of the second wire drawing wheel and increases the workload of the staff.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a quick-change structure for the tower wheel of a wire drawing machine, comprising a base and a second guide wheel assembly, wherein a limit component is provided on the base;

[0006] The limiting assembly includes a cylinder, a second support frame, a tower wheel, a sliding mounting base, and four limiting fixing blocks. The cylinder is fixedly installed on the upper surface of the second support frame, and the second support frame is fixedly installed on the outer wall of the support plate on the base. The outer walls of the rotating shafts at both ends of the tower wheel are in corresponding contact with the inside of the grooves on both sides of the lower end of the sliding mounting base.

[0007] Among them, fixed mounting seats are slidably connected to the grooves on both sides of the lower end of the sliding mounting seat. Two T-shaped block grooves are opened on the outer walls of both sides of the lower end of the sliding mounting seat. The same T-shaped block grooves are opened on the outer walls of both ends of the two fixed mounting seats. Fixed bolts are threadedly connected to the outer walls of the four limiting fixed blocks. Fixed bolt grooves are opened in the interior of the eight T-shaped block grooves.

[0008] Preferably, the second support frame is L-shaped, and the output end of the cylinder slides to the upper outside of the second support frame and is fixedly connected to the upper surface of the sliding mounting seat.

[0009] Among them, the upper ends of the two fixed mounting seats are arc-shaped and the arc surfaces are in corresponding contact with the outer walls of the rotating shafts at both ends of the tower wheel. The T-shaped block groove on the sliding mounting seat and the fixed mounting seat on the fixed mounting seat cooperate with each other to form an H-shaped groove.

[0010] Preferably, the outer walls of the upper and lower ends of the four limiting and fixing blocks are respectively slidably connected to the interior of the T-shaped block groove on the sliding mounting base and the interior of the T-shaped block groove on the fixed mounting base;

[0011] Among them, the ends of the eight fixing bolts near the fixing bolt slots are all threaded into the interior of the T-shaped block slots and respectively connected to the internal threads of the corresponding fixing bolt slots. The outer walls of the two T-shaped blocks on one side of the sliding mounting seat are slidably connected to the interiors of the two T-shaped block slots opened on the outer wall of the inner wall fixing plate of the second support frame.

[0012] Preferably, a first support frame is fixedly installed on the upper surface of the base, and a first guide wheel assembly is fixedly installed on the outer wall of the support plate on the base. The first guide wheel assembly consists of a guide wheel and a bracket.

[0013] Among them, a winding reel is rotatably connected to the upper surface of the U-shaped fixing frame at the end of the base away from the first support frame, and a second motor is fixedly installed inside the U-shaped fixing frame on the base.

[0014] Preferably, the output end of the second motor extends rotatably to the outside of the U-shaped fixing frame and is fixedly connected to one end of the take-up reel, and the first motor is fixedly connected to the upper surface of the protrusion on the support plate of the base;

[0015] Among them, the outer walls of the two T-shaped blocks at the rear end of the bracket of the second guide wheel assembly are slidably connected to the two T-shaped block slots on the outer wall of the support plate on the base, and a threaded rod is rotatably connected inside the slot on the outer wall of the support plate on the base.

[0016] Preferably, the bracket on the second guide wheel assembly is threadedly connected to the outer wall of the threaded rod, and the output end of the first motor extends rotatably into the groove on the outer wall of the support plate on the base and is fixedly connected to one end of the threaded rod.

[0017] The second guide wheel assembly consists of a U-shaped frame, a bracket, and two guide wheels. The first guide wheel assembly is located at one end of the first support frame, the second guide wheel assembly is located at the end away from the first support frame, and the limiting assembly is located in the middle of the second guide wheel assembly and the first guide wheel assembly.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. The quick-change structure for the tower wheel of this wire drawing machine allows for the separation of the fixed mounting seat and the sliding mounting seat by loosening the fixing bolts in the limiting assembly and removing the limiting fixing block. Simultaneously, the cylinder is activated, and its output end drives the sliding mounting seat to slide upward along the T-shaped block groove on the inner wall of the second support frame, thereby lifting the tower wheel and removing it from the working position for easy replacement. This effectively improves the maintenance and repair efficiency of the tower wheel, while also enhancing the practicality and flexibility of the equipment. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the external structure of the tower wheel of this utility model;

[0023] Figure 3 This is a schematic diagram of the external structure of the second guide wheel assembly of this utility model;

[0024] Figure 4 This utility model Figure 2 A structural schematic diagram of the enlarged view at point A in the middle.

[0025] Reference numerals in the attached drawings: 1. Base; 2. First guide wheel assembly; 3. First support frame; 4. Cylinder; 5. Second support frame; 6. First motor; 7. Second guide wheel assembly; 8. Take-up reel; 9. Second motor; 10. Tower wheel; 11. Fixed mounting base; 12. Sliding mounting base; 13. Threaded rod; 14. Limiting and fixing block; 15. Fixing bolt; 16. T-block groove; 17. Fixing bolt groove. Detailed Implementation

[0026] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] Please see Figure 1-4 This utility model provides a technical solution: the quick-change structure for the tower wheel of a wire drawing machine includes a base 1 and a second guide wheel assembly 7;

[0031] A limit component is provided on the base 1;

[0032] The limiting assembly includes a cylinder 4, a second support frame 5, a tower wheel 10, a sliding mounting base 12, and four limiting fixing blocks 14. The second support frame 5 is L-shaped. The cylinder 4 is fixedly mounted on the upper surface of the second support frame 5. The second support frame 5 is fixedly mounted on the outer wall of the support plate on the base 1. The output end of the cylinder 4 slides to the upper outside of the second support frame 5 and is fixedly connected to the upper surface of the sliding mounting base 12. The outer walls of the rotating shafts at both ends of the tower wheel 10 are in corresponding contact with the inner grooves on both sides of the lower end of the sliding mounting base 12. Fixed mounting bases 11 are slidably connected to the inner grooves on both sides of the lower end of the sliding mounting base 12. The upper ends of the two fixed mounting bases 11 are arc-shaped, and the arc surfaces are in corresponding contact with the outer walls of the rotating shafts at both ends of the tower wheel 10. Two T-shaped block grooves 16 are opened on the outer walls on both sides of the lower end of the sliding mounting base 12. The outer walls at both ends of the two fixed mounting bases 11 are... The sliding mounting base 12 has the same T-shaped slot 16. The T-shaped slot 16 on the sliding mounting base 12 and the fixed mounting base 11 on the fixed mounting base 11 cooperate with each other to form an H-shaped slot. The outer walls of the four limiting fixing blocks 14 are all threaded with fixing bolts 15. The inner walls of the eight T-shaped slots 16 are all provided with fixing bolt slots 17. The upper and lower outer walls of the four limiting fixing blocks 14 are respectively slidably connected to the inner walls of the T-shaped slots 16 on the sliding mounting base 12 and the T-shaped slots 16 on the fixed mounting base 11. The ends of the eight fixing bolts 15 near the fixing bolt slots 17 are threaded into the inner walls of the T-shaped slots 16 and are respectively threadedly connected to the inner walls of the corresponding fixing bolt slots 17. The outer walls of the two T-shaped blocks on one side of the sliding mounting base 12 are slidably connected to the inner walls of the two T-shaped slots on the outer walls of the inner wall fixing plate of the second support frame 5.

[0033] The base 1 has a first support frame 3 fixedly mounted on its upper surface. A first guide wheel assembly 2, consisting of guide wheels and a bracket, is fixedly mounted on the outer wall of the support plate on the base 1. A take-up reel 8 is rotatably connected to the upper surface of a U-shaped fixed frame on the base 1 away from the first support frame 3. A second motor 9 is fixedly mounted inside the U-shaped fixed frame on the base 1. The output end of the second motor 9 extends rotatably to the outside of the U-shaped fixed frame and is fixedly connected to one end of the take-up reel 8. A first motor 6 is fixedly connected to the upper surface of a protrusion on the support plate on the base 1. The outer walls of the two T-shaped blocks at the rear end of the bracket of the second guide wheel assembly 7 are connected to the upper surface of the base 1. The two T-shaped slots on the outer wall of the support plate are slidably connected. The support plate on the base 1 has a slot on the outer wall of the support plate that is rotatably connected to a threaded rod 13. The bracket on the second guide wheel assembly 7 is threadedly connected to the outer wall of the threaded rod 13. The output end of the first motor 6 extends rotatably into the slot on the outer wall of the support plate on the base 1 and is fixedly connected to one end of the threaded rod 13. The second guide wheel assembly 7 consists of a U-shaped frame, a bracket and two guide wheels. The first guide wheel assembly 2 is located at one end of the first support frame 3, and the second guide wheel assembly 7 is located at the end away from the first support frame 3. The limiting component is located between the second guide wheel assembly 7 and the first guide wheel assembly 2.

[0034] Furthermore, when using this device, the base 1 serves as the foundation of the entire structure. The first guide wheel assembly 2 on it guides the wire into the system. The first guide wheel assembly 2 consists of a guide wheel and a bracket, ensuring that the wire enters the subsequent processing stage at the correct angle. The first support frame 3 provides a stable support structure for the system, ensuring the stability of the entire wire drawing process. The rotating shafts at both ends of the tower wheel 10 are placed in the grooves on both sides of the lower end of the sliding mounting seat 12. At the same time, the fixed mounting seat 11 contacts the rotating shafts at both ends of the tower wheel 10 from below. The arc-shaped contact surfaces of the two ensure good fit. The T-shaped block grooves 16 on the sliding mounting seat 12 and the fixed mounting seat 11 are aligned to form an H-shaped groove. The limiting fixing block 14 is inserted into the H-shaped groove and is threadedly connected to the fixing bolt groove 17 in the T-shaped block groove 16 by the fixing bolt 15, thereby firmly fixing the sliding mounting seat 12 and the fixed mounting seat 11 together, achieving reliable limiting of the tower wheel 10. Then, the first motor 6 drives the threaded rod 13 to rotate. Since the bracket on the second guide wheel assembly 7 is threadedly connected to the threaded rod 13, and the T-shaped block at the rear end of the bracket is slidably connected to the T-shaped block groove on the base 1, the rotation of the threaded rod 13 drives the second guide wheel assembly 7 to move linearly along the T-shaped block groove, thereby adjusting the wire stretching position. The second motor 9 drives the winding reel 8 to rotate, winding up the wire stretched by the tower wheel 10, completing the entire wire drawing process. Then, when the tower wheel 10 needs to be replaced, first loosen the fixing bolt 15 and remove the limiting fixing block 14 to separate the fixed mounting seat 11 from the sliding mounting seat 12. At the same time, the cylinder 4 is started, and its output end drives the sliding mounting seat 12 to slide upward along the T-shaped block groove on the inner wall of the second support frame 5, thereby lifting the tower wheel 10 and removing it from the working position for easy replacement. After the replacement is completed, the cylinder 4 drives the sliding mounting seat 12 to descend, placing the new tower wheel 10 in place, and then fixing it again by the limiting fixing block 14 and the fixing bolt 15 to achieve quick replacement.

[0035] By loosening the fixing bolt 15 in the limiting assembly and removing the limiting fixing block 14, the fixed mounting seat 11 is separated from the sliding mounting seat 12. At the same time, the cylinder 4 is activated, and its output end drives the sliding mounting seat 12 to slide upward along the T-shaped block groove on the inner wall of the second support frame 5, thereby lifting the tower wheel 10 and removing it from the working position for easy replacement. This effectively improves the maintenance and repair efficiency of the tower wheel 10, while also improving the practicality and flexibility of the equipment.

[0036] Structural Description: Base 1: Serves as the supporting foundation for the entire structure. Multiple components, such as the first support frame 3, the first guide wheel assembly 2, and the winding reel 8, are installed on it, providing them with a stable installation position.

[0037] First guide wheel assembly 2: Composed of guide wheels and brackets, it is fixedly installed on base 1 and is responsible for guiding the wire into the wire drawing system to ensure that the wire is processed in the correct angle and path;

[0038] First support frame 3: It is fixedly installed on the base 1, providing rigid support for the entire structure, enhancing the stability of the system, and ensuring the accuracy of the wire drawing process;

[0039] Cylinder 4: It is fixedly installed on the upper surface of the second support frame 5. Its output end is connected to the sliding mounting seat 12. It drives the sliding mounting seat 12 to move up and down through telescopic movement, thereby realizing the quick replacement of the tower wheel 10.

[0040] The second support frame 5 is L-shaped and is fixedly installed on the outer wall of the support plate on the base 1 to provide installation support for the cylinder 4. At the same time, the T-shaped block groove on its inner wall provides a guiding function for the sliding of the sliding mounting seat 12.

[0041] First motor 6: Fixedly installed on the upper surface of the support plate protrusion on the base 1, its output end is connected to the threaded rod 13, driving the threaded rod 13 to rotate, thereby driving the second guide wheel assembly 7 to move;

[0042] The second guide wheel assembly 7 consists of a U-shaped frame, a bracket, and two guide wheels. The T-shaped block at the rear end of the bracket is slidably connected to the T-shaped block groove on the base 1. The bracket is threadedly connected to the threaded rod 13. By rotating the threaded rod 13, the second guide wheel assembly 7 can move linearly along the T-shaped block groove to adjust the tension position of the wire.

[0043] Winding reel 8: Rotatably connected to the upper surface of the U-shaped fixed frame on the base 1 away from the first support frame 3, driven by the second motor 9, responsible for winding up the stretched wire;

[0044] The second electric motor 9 is fixedly installed inside the U-shaped fixing frame on the base 1, and its output end is connected to the take-up reel 8 to provide rotational power for the take-up reel 8.

[0045] Tower wheel 10: The core component of the wire drawing machine, which stretches the wire through wheel grooves of different diameters. Its two ends of the rotating shaft cooperate with the sliding mounting seat 12 and the fixed mounting seat 11 to achieve quick change and stable operation.

[0046] Fixed mounting base 11: It is slidably connected to the grooves on both sides of the lower end of the sliding mounting base 12, and the upper end is arc-shaped, corresponding to the outer wall of the rotating shaft at both ends of the tower wheel 10. It is fixed together with the sliding mounting base 12 by the limiting fixing block 14 and the fixing bolt 15, so as to achieve reliable support and fixation of the tower wheel 10.

[0047] Sliding mounting base 12: It is fixedly connected to the output end of the cylinder 4. The grooves on both sides of the lower end are used to place the rotating shaft of the tower wheel 10 and the fixed mounting base 11. The T-shaped block on one side is slidably connected to the T-shaped block groove on the inner wall of the second support frame 5. It can slide up and down under the drive of the cylinder 4 to realize the position adjustment of the tower wheel 10.

[0048] Threaded rod 13: Rotatably connected to the groove opened on the outer wall of the support plate on the base 1, one end of which is connected to the output end of the first motor 6. Driven by the first motor 6, the threaded rod 13 rotates, driving the second guide wheel assembly 7 threadedly connected to it to move.

[0049] Limiting and fixing block 14: used to fix the sliding mounting base 12 and the fixed mounting base 11. Its upper and lower outer walls are respectively slidably connected to the T-shaped block groove 16 on the sliding mounting base 12 and the fixed mounting base 11, and are fastened by fixing bolts 15.

[0050] Fixed bolt 15: Threaded connection to the outer wall of the limiting fixed block 14, with one end threaded into the fixed bolt groove 17 inside the T-shaped block groove 16, to firmly fix the limiting fixed block 14 on the sliding mounting seat 12 and the fixed mounting seat 11, ensuring the stable installation of the tower wheel 10.

[0051] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A quick-change structure for the tow roller of a wire drawing machine, comprising a base (1) and a second guide roller assembly (7), characterized in that: A limit component is provided on the base (1); The limiting assembly includes a cylinder (4), a second support frame (5), a tower wheel (10), a sliding mounting seat (12), and four limiting fixing blocks (14). The cylinder (4) is fixedly installed on the upper surface of the second support frame (5), and the second support frame (5) is fixedly installed on the outer wall of the support plate on the base (1). The outer walls of the rotating shafts at both ends of the tower wheel (10) are in corresponding contact with the inner grooves on both sides of the lower end of the sliding mounting seat (12). Among them, the sliding mounting base (12) has a fixed mounting base (11) slidably connected inside the grooves on both sides of the lower end. The sliding mounting base (12) has two T-shaped block grooves (16) on both sides of the lower end of the outer wall. The two fixed mounting bases (11) have the same T-shaped block grooves (16) on both ends of the outer wall. The four limiting fixing blocks (14) have fixing bolts (15) threadedly connected to their outer walls. The eight T-shaped block grooves (16) have fixing bolt grooves (17) inside.

2. The quick-change structure for the wire drawing machine tower wheel according to claim 1, characterized in that: The second support frame (5) is L-shaped, and the output end of the cylinder (4) slides to the upper part of the second support frame (5) and is fixedly connected to the upper surface of the sliding mounting seat (12). Among them, the upper ends of the two fixed mounting seats (11) are arc-shaped and the arc surface is in contact with the outer wall of the rotating shaft at both ends of the tower wheel (10). The T-shaped block groove (16) on the sliding mounting seat (12) and the fixed mounting seat (11) on the fixed mounting seat (11) cooperate with each other to form an H-shaped groove.

3. The quick-change structure for the wire drawing machine tower wheel according to claim 1, characterized in that: The upper and lower outer walls of the four limiting and fixing blocks (14) are respectively slidably connected to the interior of the T-shaped block groove (16) on the sliding mounting base (12) and the interior of the T-shaped block groove (16) on the fixed mounting base (11); Among them, the ends of the eight fixing bolts (15) near the fixing bolt groove (17) are all threaded into the interior of the T-shaped block groove (16) and respectively connected to the internal threads of the corresponding fixing bolt groove (17). The two T-shaped blocks on one side of the sliding mounting seat (12) are slidably connected to the two T-shaped block grooves opened on the inner wall of the fixing plate of the second support frame (5).

4. The quick-change structure for the wire drawing machine tower wheel according to claim 1, characterized in that: The upper surface of the base (1) is fixedly installed with a first support frame (3), and the outer wall of the support plate on the base (1) is fixedly installed with a first guide wheel assembly (2), which consists of a guide wheel and a bracket; Among them, a winding reel (8) is rotatably connected to the upper surface of the U-shaped fixed frame at the end of the base (1) away from the first support frame (3), and a second motor (9) is fixedly installed inside the U-shaped fixed frame on the base (1).

5. The quick-change structure for the wire drawing machine tower wheel according to claim 4, characterized in that: The output end of the second motor (9) extends to the outside of the U-shaped fixed frame and is fixedly connected to one end of the take-up reel (8). The first motor (6) is fixedly connected to the upper surface of the support plate protrusion on the base (1). Among them, the outer walls of the two T-shaped blocks at the rear end of the bracket of the second guide wheel assembly (7) are slidably connected to the two T-shaped block slots opened on the outer wall of the support plate on the base (1), and the slots opened on the outer wall of the support plate on the base (1) are rotatably connected to the threaded rod (13).

6. The quick-change structure for the wire drawing machine tower wheel according to claim 1, characterized in that: The bracket on the second guide wheel assembly (7) is threadedly connected to the outer wall of the threaded rod (13), and the output end of the first motor (6) rotates and extends to the groove on the outer wall of the support plate on the base (1) and is fixedly connected to one end of the threaded rod (13). The second guide wheel assembly (7) consists of a U-shaped frame, a bracket and two guide wheels. The first guide wheel assembly (2) is located at one end of the first support frame (3), the second guide wheel assembly (7) is located at the end away from the first support frame (3), and the limiting assembly is located in the middle between the second guide wheel assembly (7) and the first guide wheel assembly (2).

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