A fully automatic magnetic core processing machine

Abstract

The present invention belongs to the field related to magnetic core processing equipment, and provides a fully automatic magnetic core processing machine. Through the arrangement of a foldable radial polishing mechanism and an axial polishing mechanism, a tubular storage effect of the polishing assembly is achieved, and the polishing assembly can be stored in the processing production line of the annular magnetic core. During the transportation of the magnetic core, uninterrupted continuous polishing processing is performed without the need for assembly line replacement, and polishing combinations of different precisions can be achieved by replacing polishing replacement parts. Compared with the existing technology, the continuous flow method can greatly optimize the processing efficiency.

Description

Technical Field

[0001] The invention belongs to the field related to magnetic core processing equipment, and in particular relates to a fully automatic magnetic core processing machine. Background Art

[0002] The magnetic core is an important core component used in the field of electrical equipment. It is widely used in technical fields such as electronic information, electromechanical, automobile, metallurgy, aerospace, and transportation. In order to ensure the use effect of the magnetic core in different equipment, the surface polishing of the magnetic core is a very important processing step.

[0003] In the existing technology, it is usually necessary to switch the assembly line during processing and polishing, and the polishing equipment is usually rigidly clamped for polishing. In this process, the magnetic core has a high probability of collision and friction scratching with the equipment, and the rigid clamping method does not have adaptive buffering of fluctuations during the motion polishing process. Large particles, defects, dust, etc. will cause irreversible damage during polishing. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a fully automatic magnetic core processing machine, aiming to solve the problems raised in the background technology.

[0005] The embodiment of the present invention is implemented as follows: a fully automatic magnetic core processing machine includes a horizontally arranged polishing assembly for polishing magnetic cores, the polishing assembly including an axial polishing mechanism and radial polishing mechanisms symmetrically arranged at both sides of the axial polishing mechanism;

[0006] There are multiple axial polishing mechanisms, and the multiple axial polishing mechanisms are evenly distributed along the circumference of the central axis mechanism;

[0007] The radial polishing mechanism is hingedly connected to the axial polishing mechanism at both sides of the axial polishing mechanism, and the rotation stroke of the radial polishing mechanism is 90 degrees. When the radial polishing mechanism is at the minimum angle, it is collinear with the axial polishing mechanism, and when the radial polishing mechanism is at the maximum angle, it is perpendicular to the axial polishing mechanism.

[0008] The axial polishing mechanism and the radial polishing mechanism are both provided with a controllable magnetic array evenly distributed along the length direction, as well as a polishing replacement part spaced apart from the axial polishing mechanism and the radial polishing mechanism on the side away from the central axis mechanism. The polishing replacement part is used to frictionally cooperate with the surface of the magnetic core to achieve polishing.

[0009] As a further embodiment of the present invention, the axial polishing mechanism includes an axial bracket fixedly mounted via a horizontally arranged central axis mechanism, a telescopic control rod being vertically provided on the axial bracket, and the polishing replacement member being spaced apart from the axial bracket at the end of the telescopic control rod;

[0010] The radial polishing mechanism includes a radial bracket hingedly connected to the axial bracket, the end of the radial bracket is hingedly connected to the axial bracket through a radial drive rod set as a telescopic structure. When the extension length of the radial drive rod changes, the radial bracket is driven to rotate. A polishing telescopic part is vertically provided on the radial bracket, and the polishing replacement part is arranged at intervals at the end of the polishing telescopic part.

[0011] As a further solution of the present invention: the controllable magnetic array on the axial polishing mechanism is arranged to be tilted toward the material advancing direction of the polishing assembly;

[0012] The controllable magnetic arrays on the radial polishing mechanism are divided into two groups and symmetrically distributed along the central cross section of the radial polishing mechanism, and are both inclined toward the central cross section. The magnetic properties of each group of controllable magnetic arrays are enhanced in the direction away from the central cross section, and each group of controllable magnetic arrays can be independently controlled.

[0013] The polishing assembly further comprises a polishing drive ring coaxially arranged with the central axis mechanism. The polishing drive ring is symmetrically arranged based on the central cross section and is used for driving the magnetic core to rotate by magnetic force.

[0014] As a further solution of the present invention: a circulation control component is also included, specifically including:

[0015] A material replacement control unit, configured to control the plurality of radial polishing mechanisms to be at a horizontal angle via radial drive rods, control the plurality of polishing replacement members to be in the same horizontal plane via telescopic control rods and polishing telescopic members, and control the activation of the controllable magnetic arrays of the axial polishing mechanism and the radial polishing mechanism;

[0016] A control unit is used to control the radial polishing mechanisms to be at an angle perpendicular to the axial polishing mechanism through the radial drive rod, control the polishing replacement member to cooperate with the magnetic ring surface through the extension length of the telescopic control rod and the polishing telescopic member, and control the closing of the controllable magnetic array of the axial polishing mechanism;

[0017] The polishing control unit is used to control the alternating strength changes of the polishing drive ring magnetic field through a preset cyclic control signal to drive the magnetic ring to rotate.

[0018] As a further solution of the present invention: the central axis mechanism specifically includes a reference central axis arranged along the horizontal direction;

[0019] The length of the reference central axis is consistent with the sum of the lengths of the axial polishing mechanism and the radial polishing mechanisms on both sides;

[0020] Both ends of the reference central axis are provided with axial connection plates on the cross-sectional plane, and adjacent polishing assemblies are connected via the axial connection plates;

[0021] The central axis mechanism further includes radial extension pieces distributed along a radial array at the central cross section of the reference central axis, and the axial polishing mechanism is installed on the radial extension pieces.

[0022] As a further solution of the present invention, it also includes a return assembly provided at the end of the polishing assembly:

[0023] The return assembly includes a guide shell bent downward, and a buffer shell vertically arranged at the end of the guide shell;

[0024] A buffer magnetic array is provided in the buffer shell. The buffer magnetic array is arranged obliquely upward and is used to slow down the sliding speed of the magnetic core through magnetic repulsion.

[0025] As a further solution of the present invention: a roller sliding mechanism is further provided in the guide housing:

[0026] The wheel pulley mechanism includes an adjusting wheel pulley frame and fixed wheel pulley frames arranged on both sides of the adjusting wheel pulley frame. The adjusting wheel pulley frame and the fixed wheel pulley frame are both arranged along the length direction of the guide shell. The adjusting wheel pulley frame and the fixed wheel pulley frame are provided with a plurality of pulleys distributed at intervals, and the pulleys are arranged higher than the guide shell.

[0027] A fully automatic magnetic core processing machine provided by an embodiment of the present invention achieves a tubular storage effect of the polishing assembly through the arrangement of a foldable radial polishing mechanism and an axial polishing mechanism, thereby enabling the polishing assembly to be stored in the processing production line of the annular magnetic core. During the transportation of the magnetic core, uninterrupted continuous polishing processing can be performed without the need for assembly line replacement, and polishing combinations of different precisions can be achieved by replacing polishing replacement parts. Compared with existing technologies, the continuous flow method can greatly optimize processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A three-dimensional structural diagram of a fully automatic magnetic core processing machine provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of an expanded polishing assembly in a fully automatic magnetic core processing machine provided by an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of the coordination of a polishing drive ring in a fully automatic magnetic core processing machine provided by an embodiment of the present invention;

[0031] Figure 4A schematic diagram of the coordination of an axial polishing mechanism in a fully automatic magnetic core processing machine provided by an embodiment of the present invention;

[0032] Figure 5 A schematic structural diagram of a radial polishing mechanism in a fully automatic magnetic core processing machine provided by an embodiment of the present invention;

[0033] Figure 6 A schematic structural diagram of a central axis mechanism in a fully automatic magnetic core processing machine provided by an embodiment of the present invention;

[0034] Figure 7 A schematic structural diagram of a return material assembly in a fully automatic magnetic core processing machine provided by an embodiment of the present invention;

[0035] Figure 8 A schematic diagram of the mechanism coordination of a return material assembly in a fully automatic magnetic core processing machine provided by an embodiment of the present invention;

[0036] Figure 9 A schematic diagram of the cooperation of a wheel sliding mechanism in a fully automatic magnetic core processing machine provided by an embodiment of the present invention;

[0037] Figure 10 A schematic structural diagram of a fixed wheel slide in a fully automatic magnetic core processing machine provided by an embodiment of the present invention.

[0038] In the accompanying drawings: 1-polishing assembly, 11-central axis mechanism, 111-reference central axis, 112-radial extension, 113-axial connecting plate, 12-axial polishing mechanism, 121-axial bracket, 122-controllable magnetic array, 123-polishing replacement part, 13-radial polishing mechanism, 131-radial bracket, 132-polishing telescopic part, 14-polishing drive ring, 15-radial drive rod, 2-return assembly, 21-guide shell, 22-wheel pulley mechanism, 221-fixed wheel pulley frame, 222-adjustable wheel pulley frame, 23-buffer shell, 24-buffer magnetic array. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0041] like Figures 1 to 3 and Figure 5As shown, a fully automatic magnetic core processing machine provided by one embodiment of the present invention includes a horizontally arranged polishing assembly 1 for polishing magnetic cores, wherein the polishing assembly 1 includes an axial polishing mechanism 12 and radial polishing mechanisms 13 symmetrically arranged on both sides of the axial polishing mechanism 12;

[0042] There are multiple axial polishing mechanisms 12, and the multiple axial polishing mechanisms 12 are evenly distributed along the circumference of the central axis mechanism 11;

[0043] The radial polishing mechanism 13 is hingedly connected to the axial polishing mechanism 12 at both sides of the axial polishing mechanism 12, and the rotation stroke of the radial polishing mechanism 13 is 90 degrees. When the radial polishing mechanism 13 is at the minimum angle, it is collinear with the axial polishing mechanism 12, and when the radial polishing mechanism 13 is at the maximum angle, it is perpendicular to the axial polishing mechanism 12;

[0044] The axial polishing mechanism 12 and the radial polishing mechanism 13 are both provided with a controllable magnetic array 122 evenly distributed along the length direction, and a polishing replacement part 123 spaced apart from the axial polishing mechanism 12 and the radial polishing mechanism 13 on the side away from the central axis mechanism 11. The polishing replacement part 123 is used to frictionally cooperate with the surface of the magnetic core to achieve polishing.

[0045] In an embodiment of the present invention, a fully automatic magnetic core processing machine is provided. By setting up a foldable radial polishing mechanism 13 and an axial polishing mechanism 12, a tubular storage effect of the polishing component 1 is achieved, and then the polishing component 1 can be stored in the processing production line of the annular magnetic core. During the transportation of the magnetic core, uninterrupted continuous polishing processing is performed without the need for assembly line replacement, and polishing combinations of different precisions can be achieved by replacing the polishing replacement part 123. Compared with the existing technology, the continuous flow method can greatly optimize the processing efficiency.

[0046] In one embodiment of the present invention, the specific implementation process is as follows: first, the polishing assembly 1 can be installed in any process position in the middle or end of the production line where magnetic core polishing can be performed. In the initial state, the radial polishing mechanism 13 and the axial polishing mechanism 12 are in the same straight line state (that is, the rotation angle is at 0 degrees). At this time, the magnetic core is fed into the polishing assembly 1 and pushed into the axial polishing mechanism 12 under the action of the controllable magnetic array 122. The radial polishing mechanism 13 then rotates to a 90-degree position to clamp the magnetic core on the side, thereby achieving simultaneous polishing of the inner diameter and side of the magnetic core. After polishing is completed, the radial polishing mechanism 13 is reset to send out the polished magnetic core and introduce a new magnetic core, thereby achieving a high-efficiency polishing process cycle; at the same time, by replacing the polishing replacement part 123 and changing its setting interval, different polishing accuracies can be achieved and it can adapt to magnetic cores to be polished of different structural sizes.

[0047] like Figures 1 to 5 As shown, as a preferred embodiment of the present invention, the axial polishing mechanism 12 includes an axial bracket 121 fixedly mounted by the horizontally arranged central axis mechanism 11, a telescopic control rod is vertically provided on the axial bracket 121, and the polishing replacement part 123 is spaced apart from the axial bracket 121 at the end of the telescopic control rod;

[0048] The radial polishing mechanism 13 includes a radial bracket 131 hingedly connected to the axial bracket 121. The end of the radial bracket 131 is hingedly connected to the axial bracket 121 through a radial drive rod 15 configured as a telescopic structure. When the extension length of the radial drive rod 15 changes, the radial bracket 131 is driven to rotate. A polishing telescopic part 132 is vertically provided on the radial bracket 131, and the polishing replacement part 123 is spaced apart at the end of the polishing telescopic part 132.

[0049] Furthermore, the controllable magnetic array 122 on the axial polishing mechanism 12 is arranged to be tilted toward the material advancing direction of the polishing assembly 1;

[0050] The controllable magnetic arrays 122 on the radial polishing mechanism 13 are divided into two groups and symmetrically distributed along the central cross section of the radial polishing mechanism 13, and are both inclined toward the central cross section. The magnetic properties of each group of controllable magnetic arrays 122 are enhanced in the direction away from the central cross section, and each group of controllable magnetic arrays 122 can be independently controlled.

[0051] The polishing assembly 1 further includes a polishing drive ring 14 coaxially arranged with the central axis mechanism 11 . The polishing drive ring 14 is symmetrically arranged based on the central cross section. The polishing drive ring 14 is used to drive the magnetic core to rotate through magnetic force.

[0052] Furthermore, as a preferred embodiment of the present invention, a circulation control component is also included, specifically including:

[0053] A material replacement control unit is used to control the multiple radial polishing mechanisms 13 to be at a horizontal angle through the radial drive rod 15, control the multiple polishing replacement members 123 to be in the same horizontal plane through the telescopic control rod and the polishing telescopic member 132, and control the activation of the controllable magnetic arrays 122 of the axial polishing mechanism 12 and the radial polishing mechanism 13;

[0054] Cooperating with the control unit, it is used to control the multiple radial polishing mechanisms 13 to be at an angle perpendicular to the axial polishing mechanism through the radial drive rod 15, control the polishing replacement member 123 to cooperate with the magnetic ring surface through the extension length of the telescopic control rod and the polishing telescopic member 132, and control the controllable magnetic array 122 of the axial polishing mechanism 12 to be closed;

[0055] The polishing control unit is used to control the alternating strength of the magnetic field of the polishing drive ring 14 through a preset cyclic control signal to drive the magnetic ring to rotate.

[0056] In one embodiment of the present invention, the axial polishing mechanism 12 and the radial polishing mechanism 13 are described, which mainly includes the hinge method of the radial polishing mechanism 13, wherein a gap is reserved between the hinge point and the end, and the end is driven and connected by a radial drive rod 15. When in use, the rotation angle is controlled by the extension and contraction of the radial drive rod 15; for the polishing replacement part 123, the remaining radial polishing mechanisms 13 and the axial polishing mechanism 12 are provided with a telescopic structure to adjust the gap between them to adapt to different magnetic core parts; the setting of the controllable magnetic array 122 mainly includes two purposes: one is to provide power for the magnetic core and send it to the center of the polishing assembly 1; the other is to accurately position the magnetic core and determine it at the center position of the axial polishing mechanism 12. Therefore, the controllable magnetic array 122 provided on the radial polishing mechanism 13 is designed to be inclined along the track, and can push the magnetic core to be subjected to force and slide in one direction when in use, while the controllable magnetic array 122 on the axial polishing mechanism 12 is symmetrically arranged toward the center. By setting the magnetic force intensity ladder, the force is unbalanced when the magnetic ring distribution is asymmetrical, and it moves toward the center position to achieve the purpose of positioning; the polishing drive ring 14 realizes the rotation control of the magnetic core through alternating magnetic field control, and polishing is based on the self-rotation of the magnetic core, which is more stable and safer to use than the rotation of the polishing equipment; in addition, the circulation control component performs process control of water polishing based on these controllable structures, which mainly includes material in and out replacement, polishing coordination control and polishing control steps.

[0057] like Figure 1 and Figure 6 As shown, as another preferred embodiment of the present invention, the central axis mechanism 11 specifically includes a reference central axis 111 arranged along the horizontal direction;

[0058] The length of the reference central axis 111 is consistent with the sum of the lengths of the axial polishing mechanism 12 and the radial polishing mechanisms 13 on both sides;

[0059] Both ends of the reference central axis 111 are provided with axial connection plates 113 on the cross-sectional plane, and adjacent polishing assemblies 1 are connected via the axial connection plates 113;

[0060] The central axis mechanism 11 further includes radial extensions 112 distributed along a radial array at the central cross section of the reference central axis 111 , and the axial polishing mechanism 12 is installed on the radial extensions 112 .

[0061] In one embodiment of the present invention, the arrangement of the central axis mechanism 11 can achieve efficient continuous splicing of the polishing assembly 1, thereby realizing the polishing requirements of multiple processes with different polishing accuracies, forming a polishing equipment assembly line that can be added and adjusted at will, with better expandability and demand adaptability; when the radial extension member 112 is in use, by changing the number of array installations along the radial direction, the spacing of the axial polishing mechanism 12 can be adjusted over a large range (much larger than the telescopic adjustable spacing range of the controllable magnetic array 122), thereby achieving adaptation to magnetic cores with different inner diameters.

[0062] like Figures 7 to 10 As shown, as another preferred embodiment of the present invention, it also includes a return assembly 2 provided at the end of the polishing assembly 1:

[0063] The return assembly 2 includes a guide shell 21 bent downward, and a buffer shell 23 vertically arranged at the end of the guide shell 21;

[0064] A buffer magnetic array 24 is provided in the buffer shell 23 . The buffer magnetic array 24 is tilted upward and is used to slow down the sliding speed of the magnetic core through magnetic repulsion.

[0065] Furthermore, a roller sliding mechanism 22 is provided in the guide housing 21:

[0066] The wheel pulley mechanism 22 includes an adjusting wheel pulley frame 222 and fixed wheel pulley frames 221 arranged on both sides of the adjusting wheel pulley frame 222. The adjusting wheel pulley frame 222 and the fixed wheel pulley frame 221 are both arranged along the length direction of the guide shell 21. The adjusting wheel pulley frame 222 and the fixed wheel pulley frame 221 are provided with a plurality of pulleys distributed at intervals, and the pulleys are arranged higher than the guide shell 21.

[0067] In one embodiment of the present invention, a return material component 2 is added, which is used to be set at the tail end of the polishing component 1 at the end of the processing process. When the polishing is completed and the assembly line needs to be replaced or stored, it is guided to the target position by the return material component 2, and its falling speed is slowed down under the action of the buffer magnetic array 24 to avoid damage caused by collision and bumping due to high-speed descent during the transfer process. The wheel mechanism 22 reduces the friction between the magnetic core and the guide shell 21 through the surface roller, and the adjustable wheel slide frame 222 can adaptively adjust the overall length by adjusting the installation position with the fixed wheel slide frame 221 to cooperate with the adjustment of the radial extension 112 (the assembly length of the guide shell 21 needs to be reduced accordingly).

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fully automatic magnetic core processing machine, characterized in that, It comprises a horizontally arranged polishing assembly (1) for polishing a magnetic core, wherein the polishing assembly (1) comprises an axial polishing mechanism (12) and radial polishing mechanisms (13) symmetrically arranged at positions on both sides of the axial polishing mechanism (12); There are multiple axial polishing mechanisms (12), and the multiple axial polishing mechanisms (12) are evenly distributed along the circumference of the central axis mechanism (11); The radial polishing mechanism (13) is hingedly connected to the axial polishing mechanism (12) at positions on both sides of the axial polishing mechanism (12), and the rotation stroke of the radial polishing mechanism (13) is 90 degrees. When the radial polishing mechanism (13) is at a minimum angle, it is collinear with the axial polishing mechanism (12), and when the radial polishing mechanism (13) is at a maximum angle, it is perpendicular to the axial polishing mechanism (12); The axial polishing mechanism (12) and the radial polishing mechanism (13) are both provided with a controllable magnetic array (122) uniformly distributed along the length direction, and a polishing replacement member (123) spaced apart from the axial polishing mechanism (12) and the radial polishing mechanism (13) on a side away from the central axis mechanism (11), the polishing replacement member (123) being used to frictionally cooperate with the surface of the magnetic core to achieve polishing; The axial polishing mechanism (12) comprises an axial bracket (121) fixedly mounted via a horizontally arranged central axis mechanism (11), a telescopic control rod being vertically arranged on the axial bracket (121), and the polishing replacement part (123) being spaced apart from the axial bracket (121) at the end of the telescopic control rod; The radial polishing mechanism (13) comprises a radial support (131) hingedly connected to the axial support (121); the end of the radial support (131) is hingedly connected to the axial support (121) via a radial drive rod (15) configured as a telescopic structure; when the extension length of the radial drive rod (15) changes, the radial support (131) is driven to rotate; a polishing telescopic member (132) is vertically provided on the radial support (131); and the polishing replacement member (123) is spaced apart at the end of the polishing telescopic member (132).

2. The fully automatic magnetic core processing machine according to claim 1, characterized in that: The controllable magnetic array (122) on the axial polishing mechanism (12) is arranged to be inclined toward the material advancing direction of the polishing assembly (1); The controllable magnetic arrays (122) on the radial polishing mechanism (13) are divided into two groups and symmetrically distributed along the central cross section of the radial polishing mechanism (13), and are both inclined toward the central cross section. The magnetic properties of each group of controllable magnetic arrays (122) are enhanced in a direction away from the central cross section, and each group of controllable magnetic arrays (122) can be independently controlled. The polishing assembly (1) further comprises a polishing drive ring (14) coaxially arranged with the central axis mechanism (11), wherein the polishing drive ring (14) is symmetrically arranged based on the central cross section, and the polishing drive ring (14) is used to drive the magnetic core to rotate by magnetic force.

3. The fully automatic magnetic core processing machine according to claim 2, characterized in that: Also included are loop control components, specifically: A material replacement control unit is used to control the plurality of radial polishing mechanisms (13) to be at a horizontal angle via a radial drive rod (15), control the plurality of polishing replacement members (123) to be in the same horizontal plane via a telescopic control rod and a polishing telescopic member (132), and control the activation of the controllable magnetic arrays (122) of the axial polishing mechanism (12) and the radial polishing mechanism (13); A control unit is used to control the plurality of radial polishing mechanisms (13) to be at an angle perpendicular to the axial polishing mechanism via a radial drive rod (15), control the polishing replacement member (123) to cooperate with the surface of the magnetic ring via the extension length of the telescopic control rod and the polishing telescopic member (132), and control the controllable magnetic array (122) of the axial polishing mechanism (12) to be closed; The polishing control unit is used to control the alternating strength of the magnetic field of the polishing drive ring (14) through a preset cyclic control signal to drive the magnetic ring to rotate.

4. The fully automatic magnetic core processing machine according to claim 1, characterized in that: The central axis mechanism (11) specifically comprises a reference central axis (111) arranged along the horizontal direction; The length of the reference central axis (111) is consistent with the sum of the lengths of the axial polishing mechanism (12) and the radial polishing mechanisms (13) on both sides; Both ends of the reference central axis (111) are provided with axial connection plates (113) on the cross-sectional plane, and adjacent polishing assemblies (1) are connected via the axial connection plates (113); The central axis mechanism (11) further comprises radial extension pieces (112) distributed along a radial array at a central cross section of the reference central axis (111), and the axial polishing mechanism (12) is mounted on the radial extension pieces (112).

5. The fully automatic magnetic core processing machine according to claim 1, characterized in that: It also includes a return assembly (2) provided at the end of the polishing assembly (1): The return material assembly (2) comprises a guide shell (21) bent downward, and a buffer shell (23) vertically arranged at the end of the guide shell (21); A buffer magnetic array (24) is provided in the buffer shell (23), and the buffer magnetic array (24) is arranged to be tilted upwards and is used to slow down the sliding speed of the magnetic core through magnetic repulsion.

6. The fully automatic magnetic core processing machine according to claim 5, characterized in that: A roller sliding mechanism (22) is also provided in the guide housing (21): The wheel pulley mechanism (22) comprises an adjusting wheel pulley frame (222) and fixed wheel pulley frames (221) arranged on both sides of the adjusting wheel pulley frame (222), the adjusting wheel pulley frame (222) and the fixed wheel pulley frame (221) are both arranged along the length direction of the guide shell (21), and a plurality of pulleys are provided on the adjusting wheel pulley frame (222) and the fixed wheel pulley frame (221), and the pulleys are arranged higher than the guide shell (21).

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