Cleaning and maintaining mechanism and winch rope winding device

By cleaning the scraper and brush of the maintenance mechanism, cleaning coal dust, and using balls to release lubricating oil, combined with the reciprocating screw control of the winch rope collection device, the problem of wire rope wear and knotting is solved, extending service life and improving operating efficiency .

CN222153064UActive Publication Date: 2024-12-13广西钢铁集团有限公司 +1
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Patent Information

Application Number
CN202420135771.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-01-19
Publication Date
2024-12-13
Estimated Expiration
2034-01-19

AI Technical Summary

Technical Problem

During the use of the flat coal rod device, a large amount of coal dust attached to the surface of the wire rope leads to accelerate wear and degradation of lubrication performance, and may pile ropes and run ropes, affecting service life and efficiency.

Method used

A cleaning and maintenance mechanism is designed, including scraper assembly and brush parts, which are used to clean coal dust on the surface of the wire rope. Combined with the maintenance parts, the lubricating oil is released through ball vibration to ensure the lubrication of the surface of the wire rope; at the same time, the rope collection device of the winch passes the reciprocating process. The wire rod controls the wire rope to wrap evenly to avoid running ropes or pile ropes.

Benefits of technology

It effectively extends the service life of the wire rope, improves the lubricating performance, avoids the problems of knotting and occupying space of the wire rope, and ensures the normal operation of the flat coal rod device.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of coal leveling bar devices of coke pushers, in particular to a cleaning and maintaining mechanism and a winch rope winding device, which comprise a bottom plate, a support frame arranged at the top of the bottom plate, and a winding component arranged at the top of the support frame, and the cleaning part comprises a scraping plate assembly arranged at the top of the bottom plate and a brush part arranged at the top of the scraping plate assembly. Coal dust on the surface of the steel wire rope and coal dust in a groove of the steel wire rope are cleaned through the scraper plate and the brush plate respectively, then the steel wire rope penetrates through the maintenance component, the groove in the surface of the steel wire rope enables the ball to vibrate and enables the cover plate to move, and therefore oil in the sleeve drips on the surface of the steel wire rope, and the purpose of maintaining the steel wire rope is achieved.
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Description

Technical Field

[0001] The utility model relates to the technical field of a coal rod leveling device for a coke pusher, in particular to a cleaning and maintenance mechanism and a winch rope collecting device. Background Art

[0002] The coal leveling rod device is one of the main mechanisms of the coke pushing car. In the coke oven production process, when the coal-feeding car on the furnace top feeds coal to the coal-feeding port in the carbonization chamber, the coal at the coal-feeding port accumulates into coal peaks. In order to make the coal loaded in the furnace flat and without missing corners, a coal leveling device needs to be installed on the coke pushing car. The coal peaks are flattened by driving the coal leveling rod back and forth to ensure that the coal in the carbonization chamber is evenly and flatly stacked. Therefore, the normal use of the coal leveling rod device is particularly important.

[0003] During the use of flat coal rods, they need to be used with wire ropes. After a period of use, a large amount of coal dust will adhere to the surface of the wire rope, which will not only accelerate the wear of the wire rope but also cause corrosion of the wire rope. Secondly, the coal dust will cover the grease layer on the surface of the wire rope, causing its lubrication performance to decrease and shorten its service life. In addition, when using the wire rope to pull out the flat coal rod, the wire rope may pile up or run, causing the wire rope to become tangled, which will not only affect the next use, but also occupy a larger space. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the problem that a large amount of coal dust adheres to the surface of the steel wire rope in the above-mentioned or prior art, the utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide a cleaning and maintenance mechanism.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: a cleaning and maintenance mechanism, including a fixing component, including a base plate, a support frame arranged on the top of the base plate, and a winding assembly arranged on the top of the support frame; a cleaning component, including a scraper assembly arranged on the top of the base plate, and a brush component arranged on the top of the scraper assembly.

[0008] As a preferred solution of the cleaning and maintenance mechanism of the utility model, the winding assembly includes a transmission shaft arranged on the top of the support frame, a roller fixed to the outer wall of the winding assembly, blocking plates arranged on both sides of the roller, and a hydraulic motor arranged at the end of the transmission shaft.

[0009] As a preferred solution of the cleaning and maintenance mechanism of the utility model, the scraper assembly includes a collection box arranged on the top of the base plate, a bearing platform arranged on one side of the scraper assembly, a bracket arranged on the top of the bearing platform, a material guide trough arranged inside the bracket, a connecting block arranged on the top of the bracket, and a scraper arranged between the connecting blocks.

[0010] As a preferred solution of the cleaning and maintenance mechanism of the utility model, the brush component includes a fixing plate arranged on the top of the bracket, a guide rod arranged inside the fixing plate, a spring sleeved on the outer wall of the guide rod, an adjusting bolt arranged on one side of the guide rod, and a brush plate fixed to one side of the guide rod.

[0011] As a preferred solution of the cleaning and maintenance mechanism of the utility model, it also includes a maintenance component, including a containing component arranged on the rear side of the top of the bracket, and an oil outlet component arranged inside the containing component.

[0012] As a preferred solution of the cleaning and maintenance mechanism of the utility model, the accommodating assembly includes a accommodating cylinder arranged on the rear side of the top of the bracket, an oil inlet passing through the top of the accommodating cylinder, a protective cover arranged on the outer wall of the oil inlet, and a accommodating chamber opened inside the accommodating cylinder.

[0013] As a preferred solution of the cleaning and maintenance mechanism of the utility model, the oil outlet assembly includes a sleeve arranged inside the accommodating tube, a stabilizing frame arranged on the inner wall of the sleeve, a guide rod arranged inside the stabilizing frame, a return spring sleeved on the outer wall of the guide rod, a cover plate arranged on the outward side of the guide rod, and a ball arranged on the bottom side of the sleeve.

[0014] The cleaning and maintenance mechanism of the utility model has beneficial effects: the utility model cleans the coal dust on the surface of the wire rope and the coal dust in the groove of the wire rope respectively through the scraper and the brush plate; secondly, the wire rope passes through the maintenance component, and the groove on its surface causes the ball to vibrate and the cover plate to move, so that the oil in the casing drips onto the surface of the wire rope, thereby achieving the purpose of maintaining the wire rope.

[0015] Given that in actual use, there are still problems of rope piling and rope running.

[0016] In order to solve the above technical problems, the utility model also provides the following technical solutions: a winch rope collection device includes a cleaning and maintenance mechanism, and a wire collection component, including a linkage component arranged on one side of the winding component, and a wire collection component arranged on the front side of the winding component.

[0017] As a preferred solution of the winch rope collecting device of the utility model, the linkage assembly includes a driving pulley arranged on one side of the winding assembly, a connecting belt arranged outside the driving pulley, and a passive pulley arranged inside the connecting belt.

[0018] As a preferred solution of the winch rope collecting device of the utility model, the wire collecting assembly includes a support plate arranged on the top of the base plate, a reciprocating screw rod arranged inside the support plate, a support rod arranged on the inner side of the support plate, and a moving part sleeved on the reciprocating screw rod and the outer wall of the support rod; wherein the moving part includes a moving block sleeved on the reciprocating screw rod and the outer wall of the support rod, a connecting shaft arranged inside the moving block, and a.

[0019] The beneficial effects of the winch rope collecting device of the utility model are as follows: the reciprocating screw rod is used to make the moving block reciprocate, thereby achieving the purpose of controlling the movement of the wire rope, so that the wire rope is evenly wound on the surface of the drum, avoiding the problems of rope running and rope piling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0021] Figure 1 This is an overall schematic diagram for cleaning and maintenance organizations.

[0022] Figure 2 It is an overall schematic diagram of the winding components used for cleaning and maintenance mechanisms.

[0023] Figure 3 Schematic diagram of cleaning components for cleaning maintenance mechanisms.

[0024] Figure 4 An overall schematic diagram of the cleaning components used for cleaning and maintenance mechanisms.

[0025] Figure 5 Schematic diagram of the disassembled cleaning parts used to clean the maintenance mechanism.

[0026] Figure 6 A top view of the cleaning components used to clean the maintenance mechanism.

[0027] Figure 7 An overall schematic diagram of the maintenance components used for cleaning and maintenance mechanisms.

[0028] Figure 8 A schematic cross-sectional view of a container for maintaining components.

[0029] Fig. 9 It is a cross-sectional schematic diagram of the casing for the oil outlet assembly.

[0030] Fig.10 This is an overall schematic diagram of the winch rope collection device.

[0031] Fig.11 It is a cross-sectional schematic diagram of the moving parts of the winch rope collection device. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0035] Example 1

[0036] Reference Figures 1 to 6 , which is the first embodiment of the utility model, and this embodiment provides a cleaning and maintenance mechanism, which includes a fixing component 100, including a base plate 101, a support frame 102 arranged on the top of the base plate 101, and a winding assembly 103 arranged on the top of the support frame 102; a cleaning component 200, including a scraper assembly 201 arranged on the top of the base plate 101, and a brush component 202 arranged on the top of the scraper assembly 201.

[0037] Specifically, the winding assembly 103 includes a transmission shaft 103c arranged on the top of the support frame 102, a roller 103a fixed to the outer wall of the winding assembly 103, blocking plates 103b arranged on both sides of the roller 103a, and a hydraulic motor 103d arranged at the end of the transmission shaft 103c, wherein blocking plates 103b are also arranged at both ends of the roller 103a, and are chamfered, and the chamfering direction is toward the roller 103a, so as to guide the wire rope so that the wire rope can be wound around the outer wall of the roller 103a.

[0038] Furthermore, the scraper assembly 201 includes a collecting box 201a arranged on the top of the base plate 101, a supporting platform 201b arranged on one side of the scraper assembly 201, a bracket 201d arranged on the top of the supporting platform 201b, a material guide trough 201c arranged inside the bracket 201d, a connecting block 201e arranged on the top of the bracket 201d, and a scraper 201f arranged between the connecting blocks 201e, and the brush component 202 includes a fixing plate 202a arranged on the top of the bracket 201d, a guide rod 202b arranged inside the fixing plate 202a, a spring 202c mounted on the outer wall of the guide rod 202b, an adjusting bolt 202d arranged on one side of the guide rod 202b, and a brush plate 202e fixed to one side of the guide rod 202b.

[0039] Among them, the center lines of the scraper 201f and the accommodating tube 301a are on the same horizontal line, and both are provided with through holes with apertures for the wire rope to pass through, wherein the through hole diameter of the scraper 201f is the same as the diameter of the wire rope, and the coal dust on the surface of the wire will be scraped off when the wire rope passes through it, and then the wire rope will pass through the brush component 202, and the brush plate 202e in the brush component 202 will clean the coal dust remaining in the gap of the wire rope, and the distance between the brush plates 202e on both sides is adjusted by rotating the adjusting bolt 202d to move the guide rod 202b to achieve the best cleaning effect. In addition, through the design of the spring 202c, the elastic force of the adjusting bolt 202d is used to pull the guide rod 202b through the brush plate 202e, and the adjusting bolt 202d on one side of the guide rod 202b will be close to the fixed plate 202a, so that it will not rotate easily, and indirectly the brush plate 202e will not move easily.

[0040] Operation process: First, the steel wire rope will be initially treated with the coal dust on the surface of the steel wire rope by the action of the scraper 201f, and then the steel wire rope will pass through the brush plate 202e. The diameter of the bristles of the brush plate 202e is small, which will clean the coal dust remaining in the gaps of the steel wire rope, so as to achieve the purpose of secondary cleaning. In this process, the fallen coal dust will fall into the guide trough 201c, and the guide trough 201c has a slope at a certain angle, so that the coal dust will slide along the guide trough 201c, and a collection box 201a is provided at the end of the guide trough 201c to achieve the purpose of collecting the coal dust, thereby centrally treating the coal dust, and the coal dust on the surface of the steel wire rope will reduce wear and corrosion after treatment, thereby extending the service life.

[0041] Example 2

[0042] Reference Figures 7 to 9, which is the second embodiment of the utility model. Different from the previous embodiment, this embodiment provides a maintenance component 300 of the cleaning and maintenance mechanism, including a containing component 301 arranged on the top rear side of the bracket 201d, and an oil outlet component 302 arranged inside the containing component 301.

[0043] Specifically, the containing assembly 301 includes a containing cylinder 301a arranged on the top rear side of the bracket 201d, an oil inlet 301b penetrating the top of the containing cylinder 301a, a protective cover 301c arranged on the outer wall of the oil inlet 301b, and a containing chamber 301d opened inside the containing cylinder 301a, and the oil outlet assembly 302 includes a sleeve 302a arranged inside the containing cylinder 301a, a stabilizing frame 302d arranged on the inner wall of the sleeve 302a, a guide rod 302b arranged inside the stabilizing frame 302d, a return spring 302c sleeved on the outer wall of the guide rod 302b, a cover plate 302e arranged on the outward side of the guide rod 302b, and a ball 302f arranged on the bottom side of the sleeve 302a.

[0044] The steel wire rope passes through the accommodating tube 301a. Since the steel wire rope is formed by twisting multiple steel wire ropes together, there must be grooves on its surface. The ball 302f provided on the maintenance component 300 contacts the grooves on the surface of the steel wire rope. When the protruding portion relative to the groove contacts the ball 302f, the ball 302f will shrink toward the inside of the sleeve 302a. That is, when the steel wire rope moves in the maintenance component 300, the ball 302f will vibrate. During the vibration of the ball 302f, the cover plate 302e will expand outward through the guide rod 302b. At this time, the sleeve 302a is equivalent to being opened, and the lubricating oil stored in the accommodating chamber 301d will flow to the ball 302f through the sleeve 302a. There is a certain friction between ball 302f and the wire rope, and when the wire rope moves, ball 302f will not only vibrate but also rotate freely. Therefore, during the rotation of ball 302f, lubricating oil will be brought to the surface of the wire rope, thereby achieving the purpose of maintaining the wire rope. Secondly, a return spring 302c is connected between the cover plate 302e and the stabilizing frame 302d. When the ball 302f returns to its original position, the cover plate 302e can also quickly return to its original position through the elastic force of the return spring 302c to close the sleeve 302a, so as to achieve the purpose of applying lubricating oil to the wire rope in small amounts and multiple times, saving certain resources without affecting the lubrication effect, and achieving the purpose of maintaining the steel wire and extending its service life.

[0045] Operation process: First, the wire rope will pass through the maintenance component 300. Due to the presence of grooves on the surface of the wire rope, the existence of these grooves will cause the ball 302f to vibrate, indirectly causing the cover plate 302e to separate from the sleeve 302a, thereby opening the oil circuit. When the ball 302f returns to its original position, the cover plate 302e will also return to its original position under the action of the return spring 302c, thereby achieving the purpose of closing the oil circuit. Since the grooves on the surface of the wire rope are relatively dense, the ball 302f vibrates more frequently, indirectly achieving the purpose of lubricating the wire rope in small amounts and multiple times, thereby saving certain resources.

[0046] Example 3

[0047] Reference Figures 10-11 , which is the third embodiment of the utility model. Different from the previous embodiment, this embodiment provides a winch rope collection device, which includes a wire collection component 400, including a linkage component 401 arranged on one side of the winding component 103, and a wire collection component 402 arranged on the front side of the winding component 103.

[0048] Specifically, the linkage assembly 401 includes a driving pulley 401a arranged on one side of the winding assembly 103, a connecting belt 401b arranged outside the driving pulley 401a, and a passive pulley 401c arranged inside the connecting belt 401b. The take-up assembly 402 includes a support plate 402a arranged on the top of the base plate 101, a reciprocating screw rod 402b arranged inside the support plate 402a, a support rod 402c arranged on the inner side of the support plate 402a, and a moving member 402d sleeved on the outer walls of the reciprocating screw rod 402b and the support rod 402c; wherein the moving member 402d includes a moving block 402d-1 sleeved on the outer walls of the reciprocating screw rod 402b and the support rod 402c, a connecting shaft 402d-2 arranged inside the moving block 402d-1, and 402d-3 arranged at the end of the connecting shaft 402d-2.

[0049] Among them, a take-up assembly 402 is arranged on the front side of the drum 103a, that is, where the wire rope passes, and a passive pulley 401c is arranged at one end of the reciprocating screw rod 402b, and a driving pulley 401a is arranged at the other end of the transmission shaft 103c and the two are connected in series through a connecting belt 401b, so as to realize the rotation of the reciprocating screw rod 402b. The rotation of the reciprocating screw rod 402b is guided by 1 of 402d-3 to move the moving block 402d-1, and the moving part 402d is supported by the support rod 402c to make its movement process more stable, and also to ensure that the wire rope can be more evenly wound around the drum 103a when it is taken up.

[0050] Operation process: First, the reciprocating screw 402b is rotated through the rotation of the hydraulic motor 103d and the action of the linkage assembly 401, wherein during the rotation of the reciprocating screw 402b, the 402d-3 inside the moving block 402d-1 will move along the groove on the surface of the reciprocating screw 402b, thereby realizing reciprocating movement, and the stroke of the reciprocating screw 402b is equal to the length of the drum 103a, ensuring that the wire rope will not be wound to the outside of the drum 103a, causing the wire rope to run away or pile up, and avoiding the wire rope from getting tangled, which will affect the next use.

[0051] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0052] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0053] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A cleaning and maintenance mechanism, characterized in that: include, A fixing component (100) comprises a bottom plate (101), a support frame (102) arranged on the top of the bottom plate (101), and a winding assembly (103) arranged on the top of the support frame (102); The cleaning component (200) comprises a scraper assembly (201) arranged on the top of the bottom plate (101), and a brush component (202) arranged on the top of the scraper assembly (201).

2. The cleaning and maintenance mechanism according to claim 1, characterized in that: The winding assembly (103) comprises a transmission shaft (103c) arranged on the top of the support frame (102), a roller (103a) fixed to the outer wall of the winding assembly (103), blocking plates (103b) arranged on both sides of the roller (103a), and a hydraulic motor (103d) arranged at the end of the transmission shaft (103c).

3. The cleaning and maintenance mechanism according to claim 1, characterized in that: The scraper assembly (201) comprises a collecting box (201a) arranged on the top of the base plate (101), a carrying platform (201b) arranged on one side of the scraper assembly (201), a bracket (201d) arranged on the top of the carrying platform (201b), a material guide trough (201c) arranged inside the bracket (201d), a connecting block (201e) arranged on the top of the bracket (201d), and a scraper (201f) arranged between the connecting blocks (201e).

4. The cleaning and maintenance mechanism according to claim 3, characterized in that: The brush component (202) comprises a fixing plate (202a) arranged on the top of the bracket (201d), a guide rod (202b) arranged inside the fixing plate (202a), a spring (202c) sleeved on the outer wall of the guide rod (202b), an adjusting bolt (202d) arranged on one side of the guide rod (202b), and a brush plate (202e) fixed to one side of the guide rod (202b).

5. The cleaning and maintenance mechanism according to claim 4, characterized in that: It also includes a maintenance component (300), including a containing component (301) arranged on the top rear side of the bracket (201d), and an oil outlet component (302) arranged inside the containing component (301).

6. The cleaning and maintenance mechanism according to claim 5, characterized in that: The containing assembly (301) comprises a containing cylinder (301a) arranged on the rear side of the top of the bracket (201d), an oil inlet (301b) penetrating the top of the containing cylinder (301a), a protective cover (301c) arranged on the outer wall of the oil inlet (301b), and a containing chamber (301d) opened inside the containing cylinder (301a).

7. The cleaning and maintenance mechanism according to claim 6, characterized in that: The oil outlet assembly (302) comprises a sleeve (302a) arranged inside the accommodating tube (301a), a stabilizing frame (302d) arranged on the inner wall of the sleeve (302a), a guide rod (302b) arranged inside the stabilizing frame (302d), a return spring (302c) sleeved on the outer wall of the guide rod (302b), a cover plate (302e) arranged on the outward side of the guide rod (302b), and a ball (302f) arranged on the bottom side of the sleeve (302a).

8. A winch rope collecting device, characterized in that: The cleaning and maintenance device comprises any one of claims 1 to 7, and The wire-receiving component (400) comprises a linkage component (401) arranged on one side of the winding component (103), and a wire-receiving component (402) arranged on the front side of the winding component (103).

9. The winch rope collecting device according to claim 8, characterized in that: The linkage assembly (401) includes a driving pulley (401a) arranged on one side of the take-up assembly (103), a connecting belt (401b) arranged outside the driving pulley (401a), and a driven pulley (401c) arranged inside the connecting belt (401b).

10. The winch rope collecting device according to claim 9, characterized in that: The wire take-up assembly (402) comprises a support plate (402a) arranged on the top of the bottom plate (101), a reciprocating screw rod (402b) arranged inside the support plate (402a), a support rod (402c) arranged on the inner side of the support plate (402a), and a moving part (402d) sleeved on the outer walls of the reciprocating screw rod (402b) and the support rod (402c); The moving member (402d) comprises a moving block (402d-1) sleeved on the outer wall of the reciprocating screw rod (402b) and the support rod (402c), a connecting shaft (402d-2) arranged inside the moving block (402d-1), and a (402d-3) arranged at the end of the connecting shaft (402d-2).