A multi-stage regulating heat shield unit and a combined heat shield spliced by the same

Abstract

The utility model belongs to the technical field of locomotive heat shield, specifically discloses a multistage adjusting type heat shield unit and combined heat shield spliced by it, heat shield unit includes the outer cover, is equipped with the sliding cavity along its arc direction in the outer cover, is equipped with fixed tooth on the inner wall of sliding cavity, and the both ends of outer cover are slidingly inserted with adjusting part respectively, and one end of every adjusting part is located in the outer cover and is curved to form the hooking part inward, the other end of adjusting part is equipped with adjusting tooth and is inserted to sliding cavity, and adjusting tooth is engaged with fixed tooth to realize multistage adjustment of adjusting part extension length. Combined heat shield includes a plurality of heat shield units, and all heat shield units are arranged along the axial direction of exhaust pipe, and two adjacent heat shield units are movably connected through connecting piece. The heat shield unit of the utility model is simple to install, can prevent scald and scratch exhaust pipe, and has good adjustability. The combined heat shield of the utility model can conveniently and quickly install and connect a plurality of heat shield units along the axial direction of exhaust pipe.

Description

Technical Field

[0001] This utility model belongs to the field of locomotive heat shield technology, and particularly relates to a multi-level adjustable heat shield unit and a combined heat shield assembled from it. Background Technology

[0002] During motorcycle operation, the exhaust pipe, as a key component for emitting exhaust gases, operates at extremely high temperatures. For example, motorcycle exhaust pipes generate extremely high temperatures during operation, posing a serious risk of burns to riders. Especially during prolonged riding, high-speed riding, or when the engine is under heavy load, the surface temperature of the exhaust pipe can rise sharply, reaching 300-500℃ or even higher. During riding, the rider's legs and feet are close to the exhaust pipe; if the rider loses balance due to motorcycle bumps or turns, or inadvertently gets too close to the exhaust pipe, they are highly likely to be burned by the high temperature. Such burns not only cause severe pain and injury but can also affect their normal life and work. Severe burns can even leave permanent scars and functional impairments. Therefore, motorcycle manufacturers install semi-circular heat shields on the exhaust pipes. While these offer some insulation, the effect is poor (only about 30%), so additional heat shields are needed to improve the overall insulation.

[0003] Currently, the most common locomotive exhaust pipe heat shield units on the market are installed on the exhaust pipe using clamps. While this installation method can secure the heat shield to a certain extent, it has many obvious drawbacks.

[0004] (I) Complex installation

[0005] The clamp installation requires precisely fitting the heat shield onto the exhaust pipe, followed by tightening the clamp using tools. In actual installation, due to the irregular shape and position of the exhaust pipe, as well as limited installation space, installers often spend considerable time and effort adjusting the position of the heat shield and the tightness of the clamps, resulting in low installation efficiency.

[0006] (ii) Insufficient protective performance

[0007] Existing heat shields are ineffective at preventing scratches on exhaust pipes. Because the clamp-on fixing method requires a high degree of fit between the heat shield and the exhaust pipe, and in actual use, the vibration and shaking of the locomotive during operation can easily cause relative displacement and friction between the heat shield and the exhaust pipe. This friction not only generates noise but also scratches the surface of the exhaust pipe, damaging the anti-corrosion layer, reducing its corrosion resistance, and shortening its service life. Furthermore, the scratched surface of the exhaust pipe is more prone to accumulating dirt and impurities, further affecting its heat dissipation performance and exhaust efficiency.

[0008] (iii) Poor adaptability

[0009] The exhaust pipes and heat shields of different locomotive models vary significantly in size and shape. Even for the same model of locomotive, the exhaust pipe may deform to varying degrees over time due to prolonged operation in bumpy, high-temperature, or corrosive environments. While the clamps on existing heat shields can adjust their installation position and tightness to a certain extent, this adjustment range is quite limited. They not only struggle to match the dimensions of exhaust pipes and heat shields from different locomotive models, but also fail to accommodate significant changes in size and shape caused by exhaust pipe deformation.

[0010] In addition, there is currently a lack of an effective combination method that allows multiple heat shield units to be easily and quickly installed and connected along the exhaust pipe axis, while ensuring the connection stability and flexibility of adjacent units to adapt to the slight deformation and vibration of the exhaust pipe under different operating conditions.

[0011] Therefore, the inventors are dedicated to designing a heat insulation cover unit and a combined heat insulation cover assembled from it to solve the above problems. Utility Model Content

[0012] The purpose of this utility model is to provide a multi-level adjustable heat insulation cover unit that is easy to install, can effectively prevent burns and scratches on the exhaust pipe, and has good adjustability.

[0013] Another objective of this utility model is to provide a combined heat insulation cover that allows multiple heat insulation cover units to be conveniently and quickly installed and connected along the axial direction of the exhaust pipe, while ensuring the connection stability and flexibility of adjacent units to adapt to the slight deformation and vibration of the exhaust pipe under different working conditions.

[0014] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0015] A multi-level adjustable heat insulation cover unit includes an arc-shaped outer cover. A sliding cavity is provided inside the outer cover along its arc direction. Fixed teeth are provided on the inner wall of the sliding cavity. Arc-shaped adjusting members are slidably inserted into both ends of the outer cover. One end of each adjusting member is located outside the outer cover and bends inward to form a hook part. The other end of the adjusting member is provided with adjusting teeth and is movably inserted into the sliding cavity. The adjusting teeth mesh with the fixed teeth to realize multi-level adjustment of the length of the adjusting member extending outside the outer cover.

[0016] As an improvement of the multi-level adjustable heat insulation cover unit of this utility model, the outer cover includes a cover body and a splicing component. The splicing component is adjusted and connected to the cover body through adjusting screws to form the sliding cavity, and the fixing teeth are located on the splicing component.

[0017] As an improvement of the multi-level adjustable heat insulation cover unit of this utility model, both the splicing component and the cover body are arc-shaped. The splicing component is located in the mounting groove on the outer wall of the cover body, and the insertion port of the sliding cavity is located on the side wall of the mounting groove near the corresponding adjusting component.

[0018] As an improvement of the multi-level adjustable heat insulation cover unit of this utility model, the bottom of the mounting groove is provided with a sliding groove, the insertion part of the adjusting member is slidably disposed in the sliding groove, and the sliding groove and the area on the splicing member opposite to the fixing tooth together form the sliding cavity.

[0019] As an improvement of the multi-level adjustable heat insulation cover unit of this utility model, the insertion part of the adjusting member is provided with a groove along its arc direction to form a U-shaped cross section, and the adjusting teeth and the groove are respectively located on two corresponding surfaces of the insertion part of the adjusting member.

[0020] As an improvement of the multi-level adjustable heat insulation cover unit of this utility model, two pairs of sliding cavities are symmetrically arranged inside the outer cover. The insertion end of each adjustment member is U-shaped and a row of adjustment teeth is provided at both ends of its opening. The two ends of the U-shaped opening of each adjustment member are respectively inserted into the corresponding pair of sliding cavities.

[0021] As an improvement of the multi-level adjustable heat insulation cover unit of this utility model, the outer wall and inner wall of the end of the adjusting member extending outside the sliding cavity are respectively provided with anti-slip texture and anti-detachment texture, the anti-detachment texture is located on the hanging part, the adjusting member is made of metal material, and the outer cover is made of plastic material.

[0022] To achieve the other objective mentioned above, the technical solution adopted by this utility model is as follows:

[0023] A combined heat shield includes multiple multi-stage adjustable heat shield units, all of which are arranged along the axial direction of the exhaust pipe, and adjacent heat shield units are movably connected by connectors.

[0024] As an improvement of the combined heat insulation cover of this utility model, the connector is separated by four blocking parts to form an intermediate section and two connecting sections. The intermediate section is located between the two connecting sections, and the two connecting sections pass through the connecting holes on the side walls of the adjacent two outer covers along their arc direction.

[0025] As an improvement of the combined heat insulation cover of this utility model, the diameter D1 of the connecting segment is smaller than the diameter D2 of the connecting segment. On the same connecting member, the two middle blocking parts are inclined toward one end face of the connecting segment to form a guide surface for the middle blocking parts to disengage from the corresponding connecting hole along their axial direction. The connecting hole is provided with a locking inlet for the connecting segment to be inserted.

[0026] Compared with existing technologies, this utility model's multi-stage adjustable heat insulation cover unit inserts two arc-shaped adjusting components into the sliding cavity of the arc-shaped outer cover, making the entire heat insulation cover unit arc-shaped. Each adjusting component engages with fixed teeth on the inner wall of the sliding cavity through adjusting teeth, achieving multi-stage adjustment of the length of the adjusting component extending beyond the outer cover. Furthermore, the ends of the two adjusting components located outside the outer cover are bent inwards to form a hook-on portion, which is then hooked onto the heat shield of the exhaust pipe. This design allows the heat insulation cover unit to be flexibly adjusted according to exhaust pipes of different sizes and shapes, ensuring good fit and adjustability with the exhaust pipe, thus improving the heat insulation effect. Simultaneously, this heat insulation cover unit is convenient and simple to install, requiring no complicated tools or operating procedures, and can be quickly and accurately installed on the exhaust pipe, greatly improving installation efficiency. In addition, its reasonable structural design effectively reduces friction with the exhaust pipe, preventing burns and scratches to the exhaust pipe surface, extending the service life of the exhaust pipe, and providing a superior solution for the heat insulation protection of locomotive exhaust pipes.

[0027] Compared with the prior art, the combined heat insulation cover of this utility model connects two adjacent heat insulation cover units with multi-level adjustment functions through connectors. This not only facilitates the installation and disassembly of the combined heat insulation cover, reducing installation difficulty and time costs, but also adapts to the slight deformation and vibration of the exhaust pipe under different working conditions, ensuring the stability and reliability of the connection. Attached image description:

[0028] Figure 1 This is a three-dimensional enlarged view of the multi-stage adjustable heat insulation cover unit of this utility model;

[0029] Figure 2 This is another three-dimensional enlarged view of the multi-stage adjustable heat insulation cover unit of this utility model;

[0030] Figure 3 This is a three-dimensional exploded and enlarged view of the multi-level adjustable heat insulation cover unit of this utility model;

[0031] Figure 4 This is another exploded and enlarged perspective view of the multi-stage adjustable heat insulation cover unit of this utility model;

[0032] Figure 5 This is a three-dimensional enlarged view of the splicing components and two adjusting components of this utility model;

[0033] Figure 6 This is a partially exploded three-dimensional view of the multi-level adjustable heat insulation cover unit of this utility model;

[0034] Figure 7 This is an enlarged cross-sectional view of the multi-stage adjustable heat insulation cover unit of this utility model;

[0035] Figure 8 This is a cross-sectional enlarged view of the multi-stage adjustable heat insulation cover unit and the locomotive exhaust pipe and anti-scalding cover of this utility model;

[0036] Figure 9 This is a perspective view of the combined heat insulation cover of this utility model;

[0037] Figure 10 This is another perspective view of the combined heat insulation cover of this utility model;

[0038] Figure 11 yes Figure 10 Enlarged view of point A in the middle;

[0039] Figure 12 This is a cross-sectional view of the combined heat insulation cover of this utility model;

[0040] Figure 13 yes Figure 12 Enlarged view of point B in the middle;

[0041] Figure 14 This is a schematic diagram of the installation process of the connector in this utility model.

[0042] Illustration:

[0043] 1. Outer cover; 11. Connecting piece; 111. Fixing tooth; 12. Cover body; 121. Mounting groove; 122. Slide groove; 123. Insertion port; 124. Connection hole; 1241. Locking entrance; 13. Screw hole; 131. Adjusting screw; 14. Slide cavity; 2. Adjusting piece; 21. Adjusting tooth; 22. Anti-slip texture; 23. Anti-slip texture; 24. Groove; 25. Hanging part; 3. Heat insulation cover unit; 4. Exhaust pipe; 41. Anti-scalding cover; 5. Connecting piece; 51. Blocking part; 511. Guide surface. Detailed Implementation

[0044] The embodiments of this utility model are described in detail below with reference to the accompanying drawings. The drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of this utility model.

[0045] Reference Figures 1 to 8 A multi-level adjustable heat insulation cover unit 3 includes an arc-shaped outer cover 1. A sliding cavity 14 is provided inside the outer cover 1 along its arc direction. Fixed teeth 111 are provided on the inner wall of the sliding cavity 14. Arc-shaped adjusting members 2 are slidably inserted into both ends of the outer cover 1. One end of each adjusting member 2 is located outside the outer cover 1 and bends inward to form a hanging part 25. The other end of the adjusting member 2 is provided with adjusting teeth 21 and is movably inserted into the sliding cavity 14. The adjusting teeth 21 mesh with the fixed teeth 111 to realize multi-level adjustment of the length of the adjusting member 2 extending outside the outer cover 1.

[0046] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 8 Preferably, two pairs of sliding cavities 14 are symmetrically arranged inside the outer cover 1, with the two pairs of sliding cavities 14 located at the left and right ends of the outer cover 1 respectively. The outer cover 1 includes a splicing component 11 and a cover body 12. Both the splicing component 11 and the cover body 12 are arc-shaped and made of plastic material. An installation groove 121 is provided on the outer wall of the cover body 12. The bottom of the installation groove 121 is provided with four sliding grooves 122. Each sliding groove 122 is elongated along the arc direction of the cover body 12. The splicing component 11 is located in the installation groove 121 on the outer wall of the cover body 12. Four rows of fixing teeth 111 are provided on the inner wall of the splicing component 11. Each sliding groove 122 and splicing component 11... The areas opposite to the corresponding rows of fixing teeth 111 together form a sliding cavity 14. The four rows of fixing teeth 111 are located on the inner top walls of the four sliding cavities 14 respectively. The insertion port 123 of each sliding cavity 14 is located on the side wall of the mounting groove 121 near the corresponding adjusting member 2. The splicing member 11 is adjusted and connected to the cover 12 through two adjusting screws 131 to form four sliding cavities 14. Specifically, the two ends of the outer cover 1 are respectively provided with screw holes 13, and the two adjusting screws 131 are respectively located in the two screw holes 13 to connect the splicing member 11 to the cover 12. At the same end of the outer cover 1, the adjusting screws 131 are located between a pair of sliding cavities 14.

[0047] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8Two adjusting components 2 are symmetrically arranged and both are made of metal. Each adjusting component 2 is arc-shaped. The end of the adjusting component 2 inserted into the outer cover 1 is the insertion end, and the end of the adjusting component 2 extending out of the outer cover 1 is the protruding end. The insertion end of each adjusting component 2 is U-shaped, and each end of its opening is provided with a row of adjusting teeth 21. The four rows of adjusting teeth 21 respectively mesh with four rows of fixed teeth 111. The two ends of the U-shaped opening of each adjusting component 2 are respectively inserted into a pair of corresponding sliding cavities 14. Specifically, the insertion part of the adjusting component 2 is slidably disposed in the sliding groove 122 and slides along the sliding groove 122. The insertion part of the adjusting component 2 is provided with a groove 24 along its arc direction to form a U-shaped transverse groove. The cross-section helps to reduce friction and make the adjustment member 2 slide more smoothly. In this embodiment, the adjustment teeth 21 and the groove 24 are respectively located on two corresponding surfaces of the insertion part of the adjustment member 2. That is, the adjustment teeth 21 are located on the outer wall of the insertion part of the adjustment member 2, and the groove 24 is located on the inner wall of the adjustment member 2 (that is, the side wall away from the splicing member 11). Each adjustment member 2 has a row of anti-slip textures 23 and a row of anti-detachment textures 22 on the outer wall and inner wall of the end extending out of the sliding cavity 14, respectively. The anti-detachment textures 22 are located on the hanging part 25 to increase the friction between the hanging part 25 and the anti-scalding cover 41. The protruding ends of the two adjustment members 2 are bent inward to lock the anti-scalding cover 41 on the exhaust pipe 4.

[0048] Reference Figures 1 to 8 The method of using the multi-stage adjustable heat insulation cover unit 3 of this utility model is as follows:

[0049] Loosen the two adjusting screws 131 to make the two adjusting parts 2 adjustable. Manually pull or push the two adjusting parts 2 to adjust the length of the two adjusting parts 2 extending outside the outer cover 1.

[0050] The heat insulation cover unit 3 is placed on the heat shield 41 outside the exhaust pipe 4 (both the heat shield 41 and the exhaust pipe 4 are original locomotives, and the heat insulation effect of the heat shield 41 is only about 30%). The hooking parts 25 at the ends of the two adjusting parts 2 are hooked to the two long-length edges of the heat shield 41 respectively, and the heat shield 41 is locked in place.

[0051] Tightening the two adjusting screws 131 will lock the two adjusting parts 2, preventing further adjustment of their extension length, and the entire heat insulation cover unit 3 will then be installed on the exhaust pipe 4.

[0052] This utility model's multi-stage adjustable heat insulation cover unit 3 inserts two arc-shaped adjusting members 2 into the sliding cavity 14 of the arc-shaped outer cover 1, making the heat insulation cover unit 3 as a whole arc-shaped. Each adjusting member 2 engages with the fixed teeth 111 on the inner wall of the sliding cavity 14 through adjusting teeth 21, realizing multi-stage adjustment of the length of the adjusting member 2 extending to the outer cover 1. Furthermore, the ends of the two adjusting members 2 located outside the outer cover 1 are bent inward to form a hooking part 25, which is used to hook onto the anti-scalding cover 41 of the exhaust pipe 4. This design allows the heat insulation cover unit 3 to be flexibly adjusted according to exhaust pipes 4 of different sizes and shapes, ensuring good fit and adjustability with the exhaust pipe 4, thus improving the heat insulation effect. At the same time, this heat insulation cover unit 3 is convenient and simple to install, requiring no complicated tools or operating procedures, and can be quickly and accurately installed on the exhaust pipe 4, greatly improving installation efficiency. In addition, its reasonable structural design can effectively reduce friction with the exhaust pipe 4, prevent burns and scratches on the surface of the exhaust pipe 4, extend the service life of the exhaust pipe 4, and provide a better solution for the heat insulation protection of the locomotive exhaust pipe 4.

[0053] Reference Figures 9 to 14 A combined heat insulation cover includes multiple multi-stage adjustable heat insulation cover units 3. All heat insulation cover units 3 are arranged along the axial direction of the exhaust pipe 4. Adjacent heat insulation cover units 3 are movably connected by a connector 5. In this embodiment, all the middle heat insulation cover units 3 are generally long arc-shaped, and the cover bodies 12 of the first and last heat insulation cover units 3 are symmetrically arranged and are pentagonal, so that the area of ​​the first and last heat insulation cover units 3 is larger than the area of ​​the middle heat insulation cover unit 3, which facilitates stable installation.

[0054] Reference Figures 9 to 14 The connector 5 is separated by four annular blocking parts 51 to form an intermediate section and two connecting sections. The intermediate section is located between the two connecting sections. The two connecting sections pass through the connecting holes 124 on the side walls of the adjacent outer covers 1 along their arc direction. The connecting holes 124 are provided with a locking inlet 1241 for the connecting sections to be inserted. The diameter D1 of the connecting section is smaller than the diameter D2 of the connecting section. On the same connector 5, the two intermediate blocking parts 51 are inclined toward one end face of the connecting section to form a guide surface 511 for the intermediate blocking parts 51 to disengage from the corresponding connecting holes 124 along their axial direction.

[0055] Reference Figures 9 to 14 The method of using this utility model combined heat insulation cover is as follows:

[0056] Insert the smaller diameter middle section of connector 5 into the connection hole 124 of a heat insulation cover unit 3, and then pull connector 5 outward. Utilize the inclined guiding characteristic of guide surface 511 to pull the corresponding blocking part 51 out of the heat insulation cover unit 3 (e.g., Figure 14As shown), one connecting segment of the connector 5 is inserted into the connecting hole 124 and limited by two adjacent blocking parts 51 to prevent the connector 5 from detaching from the heat insulation cover unit 3.

[0057] By inserting the connecting segment at the other end of the connector 5 into another heat shield unit 3 in the same way, the two heat shield units 3 can be connected together.

[0058] After connecting multiple heat insulation cover units 3 together in the same way, each heat insulation cover unit 3 is then fitted onto the anti-scalding cover 41 of the exhaust pipe 4 and locked in place. Then the entire combined heat insulation cover can be installed on the anti-scalding cover 41 of the exhaust pipe 4.

[0059] When it is necessary to remove the combined heat insulation cover, loosen each adjusting screw 131 to remove the entire combined heat insulation cover. Push the connector 5 to one side of the heat insulation cover unit 3 so that the connecting section of the connector 5 retracts into the heat insulation cover unit 3 and the middle section of the connector 5 enters the connecting hole 124. The connector 5 can then be removed using the locking inlet 1241 of the connecting hole 124. In the same way, remove the other end of the connector 5 and other connectors 5 to separate all the heat insulation cover units 3.

[0060] The combined heat insulation cover of this utility model is movably connected to two adjacent heat insulation cover units 3 with multi-level adjustment function through the connector 5. This not only facilitates the installation and disassembly of the combined heat insulation cover, reducing the installation difficulty and time cost, but also can adapt to the slight deformation and vibration of the exhaust pipe 4 under different working conditions, ensuring the stability and reliability of the connection.

[0061] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of protection of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the patent application of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A multi-stage adjustable heat insulation cover unit, characterized in that, The device includes an arc-shaped outer cover, with a sliding cavity provided inside the outer cover along its arc direction. The inner wall of the sliding cavity is provided with fixed teeth. Arc-shaped adjusting members are slidably inserted into both ends of the outer cover. One end of each adjusting member is located outside the outer cover and bends inward to form a hook part. The other end of the adjusting member is provided with adjusting teeth and is movably inserted into the sliding cavity. The adjusting teeth mesh with the fixed teeth to realize multi-level adjustment of the length of the adjusting member extending outside the outer cover.

2. The multi-stage adjustable heat insulation cover unit according to claim 1, characterized in that, The outer cover includes a cover body and a splicing component. The splicing component is adjusted and connected to the cover body by adjusting screws to form the sliding cavity. The fixing teeth are located on the splicing component.

3. The multi-stage adjustable heat insulation cover unit according to claim 2, characterized in that, Both the splicing component and the cover are arc-shaped. The splicing component is located in the mounting groove on the outer wall of the cover, and the insertion port of the sliding cavity is located on the side wall of the mounting groove near the corresponding adjusting component.

4. The multi-stage adjustable heat insulation cover unit according to claim 3, characterized in that, The bottom of the mounting groove is provided with a sliding groove, and the insertion part of the adjusting member is slidably disposed in the sliding groove. The sliding groove and the area on the splicing member opposite to the fixing tooth together form the sliding cavity.

5. The multi-stage adjustable heat insulation cover unit according to claim 4, characterized in that, The insertion portion of the adjusting member has a groove along its arc direction to form a U-shaped cross section, and the adjusting teeth and the groove are respectively located on two corresponding surfaces of the insertion portion of the adjusting member.

6. The multi-stage adjustable heat insulation cover unit according to claim 1, characterized in that, The outer cover is symmetrically provided with two pairs of sliding cavities. The insertion end of each adjustment member is U-shaped and has a row of adjustment teeth at both ends of its opening. The two ends of the U-shaped opening of each adjustment member are respectively inserted into the corresponding pair of sliding cavities.

7. The multi-stage adjustable heat insulation cover unit according to claim 1, characterized in that, The outer and inner walls of the end of the adjusting member extending outside the sliding cavity are respectively provided with anti-slip texture and anti-detachment texture. The anti-detachment texture is located on the hook part. The adjusting member is made of metal material, and the outer cover is made of plastic material.

8. A combined heat insulation cover, characterized in that, It includes multiple multi-stage adjustable heat shield units as described in any one of claims 1-7, all of which are arranged along the axial direction of the exhaust pipe, and adjacent heat shield units are movably connected by a connector.

9. The combined heat insulation cover according to claim 8, characterized in that, The connector is separated by four blocking parts to form an intermediate section and two connecting sections. The intermediate section is located between the two connecting sections, and the two connecting sections pass through connecting holes on the sidewalls of the adjacent outer cover along their arc direction.

10. The combined heat insulation cover according to claim 9, characterized in that, The diameter D1 of the connecting segment is smaller than the diameter D2 of the connecting segment. On the same connecting member, the two middle blocking parts are inclined toward one end face of the connecting segment to form a guide surface for the middle blocking parts to disengage from the corresponding connecting hole along their axial direction. The connecting hole is provided with a slot for the connecting segment to be inserted.

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