Novel spindle wheel carrying device

By designing a multi-angle carrier device, combining front and rear walking motors, left and right walking motors and lifting components, the problem of low degree of spindle wheel loading is solved, efficient and safe spindle wheel transportation is achieved, and positioning effect and adaptability are enhanced.

CN223213221UActive Publication Date: 2025-08-12SAILUO JIAYU (QINGDAO) MASCH CO LTD
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Patent Information

Application Number
CN202422623441.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-29
Publication Date
2025-08-12
Estimated Expiration
2034-10-29

AI Technical Summary

Technical Problem

The existing spindle wheel carrier has low degree of automation, poor positioning effect, weak adaptability, manual intervention is required during transportation, and insufficient stability.

Method used

A spindle wheel carrying device including a moving part and a bearing part is designed, using a front and rear walking motor, a left and right walking motor and a lifting assembly, combined with a support rod and a positioning rod to realize multi-angle loading and precise positioning, and improve the degree of automation through a servo motor and a PLC control system.

Benefits of technology

It realizes multi-angle automated transportation of spindle wheels, improves transportation efficiency and safety, enhances positioning effect, has stronger adaptability, reduces manual intervention, and improves the stability and accuracy of the transportation process.

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Abstract

The utility model provides a novel spindle wheel carrying device which comprises a moving part and a bearing part, the moving part comprises a moving frame, a front-back walking motor and a left-right walking motor, the front-back walking motor and the left-right walking motor are arranged on the top of the moving frame, and the bearing part comprises a hoisting assembly arranged at the bottom of the moving part and a bearing frame connected with the hoisting assembly. The bearing frame comprises a bearing rod, a positioning rod and a bearing body connected with the bearing rod and the positioning rod, the vertical position of the positioning rod is higher than that of the bearing rod, and the positioning rod corresponds to the center of the spindle wheel; the front-back walking motor and the left-right walking motor are arranged and matched with the structure of the moving frame, so that multi-angle carrying of the carrying device is achieved, the automation degree is high, and the carrying efficiency is high; by arranging the positioning rod structure corresponding to the center of the spindle wheel, a certain positioning effect can be achieved through cooperation of the positioning rod and the center of the spindle wheel in the transportation process, the positioning effect on the spindle wheel in the carrying process is further improved, and the safety and reliability of transportation are guaranteed.
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Description

Technical Field

[0001] The present application relates to the technical field of spindle wheel transport equipment for winding steel wire ropes, and in particular to a novel spindle wheel transport device. Background Art

[0002] The steel cord conveyor belt production line consists of two main components: the main machine and auxiliary equipment. The main machine includes the frame, support plate heating plate, hydraulic cylinder pump station, and electrical control. The auxiliary equipment includes the spindle rack, tension station, fixed combing station, forming car, multi-function belt drawing unit, hydraulic belt cutting machine, coiling and packaging machine, and other equipment. It is equipped with a hydraulic station and electrical control system. This equipment can meet the production process requirements of steel cord conveyor belts under tension and forming and vulcanization. The minimum steel cord diameter is φ2.5mm, and the maximum is φ13.0mm. The electronic control system uses PLC and can be operated in both manual and automatic modes.

[0003] In the subsequent transportation of the wire rope, it is often necessary to wrap the wire rope around the spindle wheel, and use the spindle wheel trolley as the main tool for loading the spindles, that is, to install the spindle wheel with the wound wire rope onto the reducer extended shaft of the spindle rack; in the existing technology, most crane equipment can only drive the spindle wheel for automatic transportation in the up and down directions, and for the left and right directions and the front and back transportation directions, manual pushing operation is often required, which is more difficult to operate; and, for large-scale production plants, there are hundreds of reducers on each spindle rack, and loading the spindles takes a lot of manpower and time; and, during transportation, spindle wheels of different specifications are often set according to the needs of the demand manufacturers to assemble the wire rope. The existing carrying device has weak adaptability, and the positioning effect of the spindle wheel is not strong, and the stability and positioning of the spindle wheel during use are poor.

[0004] Therefore, the existing technology needs to be further improved and enhanced. Utility Model Content

[0005] The present application provides a novel spindle wheel carrying device to solve the problems of low spindle wheel carrying efficiency, poor automation, poor positioning effect, and low adaptability in the prior art.

[0006] The technical solutions adopted in this application are:

[0007] The present application provides a novel spindle wheel carrying device, which includes a moving part and a bearing part. The moving part includes a moving frame and front and rear travel motors and left and right travel motors arranged on the top of the moving frame. The bearing part includes a lifting assembly arranged at the bottom of the moving part and a supporting frame connected to the lifting assembly. The supporting frame includes a supporting rod, a positioning rod and a supporting body connected to the two. The vertical position of the positioning rod is higher than the supporting rod, and the positioning rod corresponds to the center of the spindle wheel.

[0008] As a preferred embodiment of the present application, the mobile frame includes a sliding rod and a walking frame, two of each are provided and the two are arranged opposite to each other and enclosed to form a square structure.

[0009] As a preferred embodiment of the present application, one side of the walking frame is provided with front and rear walking motors, the side wall opposite to the walking motor is provided with rollers, and the outer edge of the walking frame on the opposite side is also provided with rollers.

[0010] As a preferred embodiment of the present application, left and right walking racks are arranged between the walking frames, the left and right walking racks are parallel to the slide bar, and the left and right walking motors are arranged on the left and right walking racks and can move along the left and right walking racks.

[0011] As a preferred embodiment of the present application, the top wall of the lifting assembly is connected to the left and right traveling motors, and four sliding blocks are provided on the surface of the slide rod. The sliding blocks are connected to the four corners of the top of the lifting assembly to drive the lifting assembly to move through the left and right traveling motors.

[0012] As a preferred embodiment of the present application, the sliding block includes a housing and a pulley, the sliding rod passes through the housing, and the pulleys are arranged on both sides of the sliding rod and are rotatably arranged in the housing.

[0013] As a preferred embodiment of the present application, the sliding block further includes an auxiliary wheel, which is arranged on the top of the shell and can pass through the top wall of the shell, and the auxiliary wheel is slidably engaged with the slide rod.

[0014] As a preferred embodiment of the present application, a guide shaft is provided between the lifting assembly and the supporting bracket, and a supporting rod and a positioning rod are provided protruding outward from the supporting body along at least one side of the running direction of the left and right travel motors.

[0015] As a preferred embodiment of the present application, at least one side wall of the supporting body is provided with a first sliding tube and a second sliding tube, the supporting rod and the positioning rod are slidingly provided on the first sliding tube and the second sliding tube respectively, and a lifting rod is provided on the top of the supporting body, and the top of the lifting rod is connected to the second sliding rod.

[0016] As a preferred embodiment of the present application, a lifting portion is provided inside the positioning rod, and a curved surface is provided at the top of the lifting portion. The curved surface has the same curvature as the outer edge of the positioning rod, and an opening adapted to the curved surface is provided on the surface of the positioning rod.

[0017] Due to the adoption of the above technical solution, the technical effects achieved by this application are:

[0018] 1. The present application provides a novel spindle wheel transport device, which realizes the front and rear and left and right movement of the entire transport equipment by setting front and rear travel motors and left and right travel motors and cooperating with the structure of the mobile frame, and realizes up and down movement by setting a lifting component, thereby achieving multi-angle transport of the transport device, with a high degree of automation and high transport efficiency; and, by setting a positioning rod structure corresponding to the center of the spindle wheel, the positioning rod and the center of the spindle wheel can play a certain positioning role during transportation, further improving the positioning effect of the spindle wheel during transportation, and ensuring the safety and reliability of transportation.

[0019] 2. As a preferred embodiment of the present application, the present application sets up left and right travel racks, so that the left and right travel is coordinated with the racks and the left and right travel motors. The coordination of the racks makes the movement smoother, further improving the safety of transportation; and, by setting up sliding blocks at the four corners of the lifting assembly, and the pulleys in the sliding blocks and the auxiliary wheels on the top of the shell cooperate with each other, the left and right movement of the equipment is further made smoother and the use is more stable.

[0020] 3. As a preferred embodiment of the present application, the present application sets a first sliding tube and a second sliding tube, and the supporting rod and the positioning rod can respectively cooperate with the first sliding tube and the second sliding tube, so that the supporting rod and the positioning rod can be extended and retracted in the left and right directions. On the one hand, it is convenient to provide more detailed adjustments for the left and right directions when placing and transporting the spindle wheel; on the other hand, the telescopic setting can adapt to spindle wheels of different widths, and is more adaptable.

[0021] 4. As a preferred embodiment of the present application, the present application is also provided with a lifting rod, which can drive the second sliding tube to move up and down, and can adapt to spindle wheels of different sizes, so that the positioning rod set in the second sliding tube can find the center position of the corresponding spindle wheel, and by setting a lifting part in the positioning rod, the arc surface of the lifting part can be used to push against the inner wall of the circular hole in the center of the spindle wheel, thereby further improving the positioning effect of the spindle wheel during transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present application and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 A schematic diagram of the overall structure of a novel spindle wheel carrier provided in this application;

[0024] Figure 2 A schematic side view of the structure of a support frame of a novel spindle wheel carrier provided in this application;

[0025] Figure 3 A schematic top view of the supporting frame of a novel spindle wheel carrier provided in this application;

[0026] Figure 4 A schematic diagram of the internal structure of a positioning rod of a novel spindle wheel carrier provided in this application.

[0027] Reference numerals:

[0028] 10 moving part; 11 moving frame; 111 sliding rod; 112 walking frame; 113 roller; 12 front and rear walking motor; 13 left and right walking motor; 14 left and right walking rack;

[0029] 20 bearing portion; 21 lifting assembly; 22 supporting bracket; 221 supporting rod; 222 positioning rod; 223 supporting body; 23 sliding block; 231 housing; 232 pulley; 233 auxiliary wheel; 24 guide shaft; 25 crane; 26 first sliding tube; 27 second sliding tube; 271 telescopic motor; 28 lifting rod; 281 lifting motor; 29 lifting portion; 291 curved surface;

[0030] 30 spindle wheels. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0033] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present application.

[0034] In this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0036] like Figures 1 to 4 As shown, the present application provides a new spindle wheel carrying device, the spindle wheel 30 carrying device includes a moving part 10 and a bearing part 20, the moving part 10 includes a moving frame 11 and front and rear walking motors 12 and left and right walking motors 13 arranged on the top of the moving frame 11, the bearing part 20 includes a lifting assembly 21 arranged at the bottom of the moving part 10 and a supporting frame 22 connected to the lifting assembly 21, the supporting frame 22 includes a supporting rod 221, a positioning rod 222 and a supporting body 223 connected to the two, the positioning rod 222 is vertically higher than the supporting rod 221, and the positioning rod 222 corresponds to the center of the spindle wheel 30.

[0037] Among them, Figure 1 As shown, the mobile frame 11 includes two slide bars 111 and a traveling frame 112, each of which is provided with two and is arranged opposite to each other and enclosed to form a square structure. It can be understood that the left and right traveling motors 13 and the front and rear traveling motors 12 are all servo motors. Utilizing the memory and absolute position functions of the servo motors, the electrical control unit can remember the position of each reducer. In this way, when loading spindles, only the corresponding reducer code of the spindle needs to be input on the control terminal, and the spindle trolley can accurately and automatically transport the spindle to the corresponding reducer, greatly improving the degree of automation.

[0038] And, as Figure 1As shown, it can be seen that one side of the walking frame 112 is provided with front and rear walking motors 12, the side wall opposite to the walking motor is provided with a roller 113, and the outer edge of the walking frame 112 on the opposite side is also provided with a roller 113.

[0039] Furthermore, left and right walking racks 14 are provided between the walking frames 112 , the left and right walking racks 14 are parallel to the slide bar 111 , and the left and right walking motors 13 are provided on the left and right walking racks 14 and can move along the left and right walking racks 14 .

[0040] It should be noted that the front and rear travel motors 12 are the same as the left and right travel motors 13, and both can use output ends that cooperate with racks to achieve the walking effect. That is to say, the output ends of the left and right travel motors 13 are engaged with the left and right travel racks 14 to complete the left and right walking movements. The front and rear travel motors 12 are also provided with an engaging structure at the output end, and at the top of the spindle frame, there should be front and rear travel racks similar to the left and right travel racks 14 to cooperate with the front and rear travel motors 12 to achieve the front and rear walking movements.

[0041] In addition, rollers 113 are provided on the outer edges of the traveling frame 112 on the opposite side of the front and rear traveling motors 12 and on the opposite side thereof, which can assist in positioning and improve the smoothness of operation during the forward and backward traveling process.

[0042] Furthermore, if Figure 1 As shown, the top wall of the lifting component 21 is connected to the left and right travel motors 13, and four sliding blocks 23 are provided on the surface of the slide rod 111. The sliding blocks 23 are connected to the four corners of the top of the lifting component 21 to drive the lifting component 21 to move through the left and right travel motors 13.

[0043] The sliding block 23 includes a housing 231 and pulleys 232 . The sliding rod 111 passes through the housing 231 . The pulleys 232 are disposed on both sides of the sliding rod 111 and are rotatably disposed in the housing 231 .

[0044] It can be understood that the effect of the pulley 232 structure in the sliding block 23 is the same as that of the roller 113 matched with the front and rear travel motors 12, which is to ensure the left and right travel of the device and improve the positioning effect and smoothness of the travel process; Figure 1 As shown, the center of the pulley 232 is a recessed structure to facilitate sliding cooperation with the slide rod 111 and further ensure the stability of sliding.

[0045] Alternatively, as Figure 1As shown, the sliding block 23 also includes an auxiliary wheel 233. The auxiliary wheel 233 is arranged on the top of the shell 231 and can pass through the top wall of the shell 231. The auxiliary wheel 233 slides with the slide rod 111. The structure of the auxiliary wheel 233 can be similar to the structure of the pulley 232. The pulley 232 in the sliding block 23 and the auxiliary wheel 233 on the top of the shell 231 cooperate with each other, further making the left and right movement of the device smoother and more stable to use.

[0046] As a preferred embodiment of the present application, Figure 2 and Figure 3 As shown, a guide shaft 24 is provided between the lifting assembly 21 and the support bracket 22 , and a support rod 221 and a positioning rod 222 are protruding outward from the support body 223 along at least one side of the running direction of the left and right travel motors 13 .

[0047] Among them, a crane 25 structure is set at the bottom of the lifting component 21 to cooperate with the guide shaft 24. The crane 25 can lift and lower the entire supporting body 223 through the guide shaft 24 to realize the up and down movement of the spindle wheel 30.

[0048] In an optional embodiment, as 1 to Figure 4 As shown, the following structure is described by taking the arrangement of the support rod and the positioning rod 222 on the left side as an example:

[0049] In this embodiment, if Figure 2 and Figure 3 As shown, a first sliding tube 26 and a second sliding tube 27 are provided on one side wall of the supporting body 223, and the supporting rod 221 and the positioning rod 222 are slidably provided on the first sliding tube 26 and the second sliding tube 27 respectively. A lifting rod 28 is provided on the top of the supporting body 223, and the top of the lifting rod 28 is connected to the second sliding rod.

[0050] Among them, there are two first sliding tubes 26, which are respectively arranged on both sides of the bottom of the supporting body 223 to support the spindle wheel 30. There is one second sliding rod, which is connected to the top of the supporting body 223 through the setting of the lifting rod 28.

[0051] As for the structure of the lifting rod 28, it can adopt multiple vertical connecting rods evenly spaced and connected to each other to ensure the consistency and stability of the lifting movement. A lifting motor 281 is provided below the vertical connecting rod to provide power for the lifting rod 28 to move up and down.

[0052] Furthermore, if Figure 3As shown, a telescopic motor 271 is provided on the side of the supporting body 223 away from the supporting rod 221 and the positioning rod 222. Two telescopic motors 271 can be provided to provide telescopic power for the supporting rod 221 and the positioning rod 222 respectively. The supporting rod 221 and the positioning rod 222 can respectively cooperate with the first sliding tube 26 and the second sliding tube 27, so that the supporting rod 221 and the positioning rod 222 can be telescoped in the left and right directions.

[0053] It can be understood that when the spindle wheel 30 finally needs to be placed in the spindle rack, the spindle rack has a reducer shaft protruding outward. By setting a sliding positioning rod 222 and a supporting rod 221, on the one hand, it is convenient to provide more detailed adjustment for the left and right directions when placing and transporting the spindle wheel 30; on the other hand, the telescopic setting can adapt to spindle wheels 30 of different widths, and is more adaptable.

[0054] Specifically, during the use of this embodiment, the wire rope core conveyor belt production line of the prior art is used to produce and process the wire rope through the main machine and the auxiliary machine, and the wire rope is wound on the spindle wheel 30, and the spindle wheel 30 is transported and placed on the supporting rod 221; before carrying the spindle wheel 30, the specification and size of the spindle wheel 30 can be input in advance through the control center, so that the supporting rod 221 extends to a sufficient length. During this process, the positioning rod 222 should be in a state of extending the shortest distance to avoid affecting it when placing the spindle wheel 30; after the spindle wheel 30 is placed, the positioning rod 222 is extended, and according to the obtained specification and size information, it is lifted to a sufficient height by the lifting rod 28 to be inserted into the center hole of the spindle wheel 30 to position it; at this time, the left and right walking motors The machine 13 and the front and rear travel motors 12 start working, driving the spindle wheel 30 to move left and right and forward and backward. The crane 25 can drive the spindle wheel 30 to move up and down through the guide shaft 24, so as to transport the spindle wheel 30 to the specified position as needed; when the spindle wheel 30 is placed on the reducer extended shaft, the left and right travel motors 13 need to move left and right, and the positioning accuracy can be improved by micro-movement of the supporting rod 221 and the positioning rod 222. During this process, the distance that the positioning rod 222 penetrates into the center axis of the spindle wheel 30 can be maintained at half the depth, which is convenient for the insertion of the reducer extended shaft. After the spindle wheel 30 is inserted into the reducer guide shaft 24, the positioning rod 222 first withdraws from the center hole of the spindle wheel 30, and then the supporting rod 221 moves downward and backward, leaving the spindle wheel 30, completing the assembly of the spindle wheel 30.

[0055] Of course, the above embodiment is a prominent embodiment of the present application. In order to further improve the efficiency of transportation, supporting rods 221 and positioning rods 222 can be set on both sides of the supporting body 223 to place two spindle wheels 30 on the left and right sides at the same time to improve work efficiency.

[0056] As an optional implementation of this application, Figure 4 As shown, a lifting portion 29 is provided inside the positioning rod 222 , and a curved surface 291 is provided at the top of the lifting portion 29 . The curved surface 291 has the same curvature as the outer edge of the positioning rod 222 , and an opening adapted to the curved surface 291 is provided on the surface of the positioning rod 222 .

[0057] It can be understood that one or more micro motors can be provided inside the positioning rod 222, and the output shaft of the micro motor is connected to the lifting part 29 to push against the inner wall of the circular hole in the center of the spindle wheel 30 through the arc surface 291 of the lifting part 29, thereby further improving the positioning effect of the spindle wheel 30 during transportation.

[0058] Of course, the equipment of the present application must be provided with a power unit and a control unit. The power unit can adopt an electrical box structure to provide electrical energy for the entire equipment, and the control unit can adopt the PLC control program or single-chip microcomputer program in the existing technology for overall control, and exchange data with each motor and the front-end processing part to further improve the degree of automation.

[0059] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0060] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0061] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A new spindle wheel carrier, characterized in that: The spindle wheel carrying device includes a moving part and a bearing part, the moving part includes a moving frame and front and rear travel motors and left and right travel motors arranged on the top of the moving frame, the bearing part includes a lifting assembly arranged at the bottom of the moving part and a supporting frame connected to the lifting assembly, the supporting frame includes a supporting rod, a positioning rod and a supporting body connected to the two, the vertical position of the positioning rod is higher than the supporting rod, and the positioning rod corresponds to the center of the spindle wheel.

2. A novel spindle wheel carrier according to claim 1, characterized in that: The movable frame includes a sliding rod and a walking frame, two of which are respectively provided and arranged opposite to each other and enclosed to form a square structure.

3. A novel spindle wheel carrier according to claim 2, characterized in that: One side of the walking frame is provided with front and rear walking motors, the side wall opposite to the walking motor is provided with rollers, and the outer edge of the walking frame on the opposite side is also provided with rollers.

4. A novel spindle wheel carrier as claimed in claim 3, characterized in that: Left and right walking racks are arranged between the walking frames, the left and right walking racks are parallel to the sliding rods, and the left and right walking motors are arranged on the left and right walking racks and can move along the left and right walking racks.

5. A novel spindle wheel carrier according to claim 4, characterized in that: The top wall of the lifting assembly is connected to the left and right travel motors, and four sliding blocks are provided on the surface of the slide rod. The sliding blocks are connected to the four corners of the top of the lifting assembly to drive the lifting assembly to move through the left and right travel motors.

6. A novel spindle wheel carrier device as claimed in claim 5, characterized in that: The sliding block comprises a shell and a pulley. The sliding rod passes through the shell. The pulleys are arranged on both sides of the sliding rod and are rotatably arranged in the shell.

7. A novel spindle wheel carrier according to claim 6, characterized in that: The sliding block further comprises an auxiliary wheel, which is arranged on the top of the shell and can pass through the top wall of the shell. The auxiliary wheel is in sliding cooperation with the sliding rod.

8. A novel spindle wheel carrier device as claimed in claim 1, characterized in that: A guide shaft is provided between the lifting assembly and the supporting bracket, and the supporting body is provided with the supporting rod and the positioning rod protruding outward along at least one side of the running direction of the left and right travel motors.

9. A novel spindle wheel carrier according to claim 8, characterized in that: At least one side wall of the supporting body is provided with a first sliding tube and a second sliding tube, the supporting rod and the positioning rod are slidingly provided on the first sliding tube and the second sliding tube respectively, and a lifting rod is provided on the top of the supporting body, and the top of the lifting rod is connected to the second sliding tube.

10. A novel spindle wheel carrier according to claim 9, characterized in that: A jacking portion is provided inside the positioning rod, and a curved surface is provided at the top end of the jacking portion. The curved surface has the same curvature as the outer edge of the positioning rod, and an opening adapted to the curved surface is provided on the surface of the positioning rod.