Pipeline discharging device applied to urban village reconstruction

Abstract

The utility model discloses a pipeline discharge device applied to the reconstruction of villages in cities, including fixed plate, mounting rack, clamping device, bi-directional screw rod and rotary handle, the right side of mounting rack is fixedly connected with the left side of fixed plate, the right side of bi-directional screw rod is movably connected with the bottom of the right side of the inner wall of mounting rack through shaft pin. Through the arrangement of the first cover cap and the second cover cap, after a user rotates the rotary handle to drive the two-way lead screw to rotate, the clamping device clamps a pipeline, then the first cover cap and the second cover cap are combined, the pipeline is wrapped by the first semicircular groove and the second semicircular groove, and therefore the installation frame is wrapped; the problems that a two-way screw rod used for adjusting a clamping device in the equipment is directly exposed, so that the two-way screw rod is rusted after being eroded by rainwater for a long time, the rusting condition is caused, the two-way screw rod is difficult to screw, and subsequent maintenance and replacement of a pipeline are affected are solved, and the auxiliary protection effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of municipal engineering, and particularly relates to a pipeline discharge device applied to the transformation of urban villages in cities. Background Technique

[0002] The transformation of urban villages in cities is a part of municipal engineering and an important basic project of the city, which includes municipal pipeline engineering. Municipal pipeline engineering includes various pipelines such as water supply, drainage, and energy. Therefore, the burial of municipal pipelines is an important component part of the development of a city.

[0003] For example, the application number: CN202121426350.6. The utility model discloses a pipeline installation device for municipal engineering, which includes an installation base. A rectangular frame is fixedly installed at the middle position of the installation base. One inner wall of the rectangular frame is rotatably connected with a first lead screw. One end of the first lead screw is fixedly connected with a second lead screw. The first lead screw is threadedly connected with a first moving block. The second lead screw is threadedly connected with a second moving block. A first fixing sleeve is fixedly installed at the top of the first support member. The utility model is provided with a first lead screw and a second lead screw. By manually rotating the fixing rod, the first support member and the second support member approach the center of the rectangular frame. The first fixing sleeve and the second fixing sleeve form a complete circular sleeve to fix the pipeline. By rotating the fixing rod in the reverse direction, the first fixing sleeve and the second fixing sleeve are separated. By providing the first lead screw and the second lead screw, the rapid fixing and replacement of the pipeline are realized. The operation is simple and convenient, the time for replacing the pipeline is saved, and the efficiency is improved.

[0004] Based on the retrieval of the above patent and the combination with the equipment in the prior art, it is found that when the above equipment is applied, although it can solve the problem that when fixing the pipeline, it is mostly manually fixed with screws. In this way, the fixing effect of the pipeline is poor. Under the action of external force, the fixed part is easy to fall off, resulting in the loosening of the pipeline. At the same time, the operation is also relatively troublesome, inconvenient for installation and disassembly, and a large amount of time and manpower are required for replacing the pipeline, reducing the work efficiency and affecting the application of the pipeline. However, during the use process, the bidirectional lead screw used for adjusting the clamping device in the above equipment is directly exposed outside, so it will rust after being eroded by rainwater for a long time, causing the situation of rust locking, making it difficult to turn the bidirectional lead screw and affecting the subsequent maintenance and replacement of the pipeline. Content of the Utility Model

[0005] To solve the problems raised in the above background technique, the purpose of the present utility model is to provide a pipeline discharge device applied to the transformation of urban villages in cities, which has the advantage of auxiliary protection, and solves the problem that the bidirectional lead screw used for adjusting the clamping device in the above equipment is directly exposed outside, so it will rust after being eroded by rainwater for a long time, causing the situation of rust locking, making it difficult to turn the bidirectional lead screw and affecting the subsequent maintenance and replacement of the pipeline.

[0006] To achieve the above object, the present utility model provides the following technical solutions: A pipeline discharge device applied to the transformation of urban villages, including a fixing plate, a mounting frame, a clamping device, a bidirectional lead screw, and a rotating handle. The right side of the mounting frame is fixedly connected to the left side of the fixing plate. The right side of the bidirectional lead screw is movably connected to the bottom of the inner wall on the right side of the mounting frame through a shaft pin. The right side of the bidirectional lead screw penetrates to the bottom of the left side of the mounting frame. The inner wall of the clamping device is threadedly connected to both sides of the surface of the bidirectional lead screw. The right side of the rotating handle is fixedly connected to the right side of the bidirectional lead screw. The top of the mounting frame is movably connected to a first cover. A second cover is provided on the top of the mounting frame. The inner walls of the first cover and the second cover are both slidably connected to the surface of the mounting frame. The surface of the rotating handle is movably connected to the inside of the first cover and the second cover. First semi-circular grooves are respectively opened at the bottoms of both sides of the first cover. Second semi-circular grooves are respectively opened at the tops of both sides of the second cover. Linkage mechanisms are fixedly connected to both sides of the left side of the fixing plate. Limiting components are respectively opened at both sides of the left side of the fixing plate. The left side of the top of the front surface of the second cover is movably connected to a fixing mechanism through a shaft pin.

[0007] Preferably, the linkage mechanism includes a support block. The right side of the support block is fixedly connected to both sides of the left side of the bottom plate. A gear is movably connected to the inside of the support block through a shaft pin. A first toothed plate is meshed and connected to the right side of the gear. The bottom of the inner side of the first toothed plate is fixedly connected to the right side of the tops of both sides of the second cover. A second toothed plate is meshed and connected to the left side of the gear. The top of the inner side of the second toothed plate is fixedly connected to the bottom of the right sides of both sides of the first cover.

[0008] Preferably, the limiting component includes a trapezoidal groove. The trapezoidal grooves are respectively opened at both sides of the left side of the fixing plate. Trapezoidal rods are fixedly connected to both sides of the right sides of the first cover and the second cover. The surface of the trapezoidal rod is slidably connected to the inner wall of the trapezoidal groove.

[0009] Preferably, the fixing mechanism includes a snap. The two sides of the bottom of the back surface of the snap are movably connected to the left side of the top of the front surface of the second cover through a shaft pin. A convex point block is fixedly connected to the left side of the bottom of the front surface of the first cover. The snap is snap-connected to the convex point block. A live rod is slidably connected to the inner wall of the convex point block.

[0010] Preferably, a stop block is fixedly connected to the left side of the support block. A collision block is fixedly connected to the bottom of the outer side of the second toothed plate.

[0011] Preferably, a counterweight block is fixedly connected to the bottom of the second cover. A plurality of counterweight blocks are provided and are distributed at equal distances.

[0012] Preferably, for the present utility model, a first semi-circular pad is fixedly connected to the inner wall of the first semi-circular groove, and a second semi-circular pad is fixedly connected to the inner wall of the second semi-circular groove.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. By providing a first cover and a second cover, after the user rotates the rotary handle to drive the bidirectional screw rod to rotate and the clamping device clamps the pipeline, and then the first cover and the second cover are combined, the first semi-circular groove and the second semi-circular groove wrap the pipeline, thereby wrapping the mounting frame, solving the problem that the bidirectional screw rod for adjusting the clamping device in the above-mentioned device is directly exposed outside, which will rust after being eroded by rainwater for a long time, causing rust and making it difficult to turn the bidirectional screw rod, affecting the subsequent maintenance and replacement of the pipeline, and achieving the effect of auxiliary protection.

[0015] 2. By providing a linkage mechanism, during the process of combining the first cover and the second cover and wrapping the pipeline with the first semi-circular groove and the second semi-circular groove to fully cover and wrap the mounting frame, as the user pulls up the second cover, the first toothed plate moves upward together and drives the gear to rotate, and then the second toothed plate moves downward correspondingly, causing the suspended first cover to descend and finally automatically combine with the second cover. And correspondingly, when pulling down the second cover, the first cover moves upward accordingly, thus facilitating the user to quickly close or separate the first cover and the second cover, improving the operation convenience.

[0016] 3. By providing a limiting component, during the opening and closing of the first cover and the second cover through the transmission of the gear, as the first cover and the second cover move symmetrically inward or outward, the trapezoidal rods on the right side of the first cover and the second cover move symmetrically inward or outward along the trapezoidal groove trajectory accordingly, thereby limiting and assisting the movement trajectories of the first cover and the second cover, and finally enabling the first toothed plate and the second toothed plate to be stably meshed with the gear, thus improving the stability when pulling the second cover to cause the corresponding movement of the first cover. Description of the Drawings

[0017] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0018] Figure 2 is a structural schematic diagram of the first cover of the present utility model being opened;

[0019] Figure 3 is an exploded schematic diagram of the parts of the first cover of the present utility model.

[0020] In the figure: 1, fixed plate; 2, mounting bracket; 3, clamping device; 4, bidirectional lead screw; 5, rotating handle; 6, first cover; 7, second cover; 8, first semi-circular groove; 9, second semi-circular groove; 10, linkage mechanism; 101, support block; 102, gear; 103, first toothed plate; 104, second toothed plate; 11, limit component; 111, trapezoidal groove; 112, trapezoidal rod; 12, fixing mechanism; 121, snap; 122, bump block; 123, live rod; 13, stop block; 14, collision block; 15, counterweight; 16, first semi-circular pad; 17, second semi-circular pad. Detailed implementation mode

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] As Figures 1 to 3 shown, a pipeline discharge device applied to the transformation of urban villages provided by the present invention includes a fixed plate 1, a mounting bracket 2, a clamping device 3, a bidirectional lead screw 4 and a rotating handle 5. The right side of the mounting bracket 2 is fixedly connected to the left side of the fixed plate 1. The right side of the bidirectional lead screw 4 is movably connected to the bottom of the inner wall on the right side of the mounting bracket 2 through a shaft pin. The right side of the bidirectional lead screw 4 penetrates to the bottom on the left side of the mounting bracket 2. The inner wall of the clamping device 3 is threadedly connected to both sides of the surface of the bidirectional lead screw 4. The right side of the rotating handle 5 is fixedly connected to the right side of the bidirectional lead screw 4. The top of the mounting bracket 2 is movably connected to a first cover 6. A second cover 7 is arranged on the top of the mounting bracket 2. The inner walls of the first cover 6 and the second cover 7 are both slidably connected to the surface of the mounting bracket 2. The surface of the rotating handle 5 is movably connected to the inside of the first cover 6 and the second cover 7. First semi-circular grooves 8 are opened at both bottoms of the first cover 6. Second semi-circular grooves 9 are opened at both tops of the second cover 7. Linkage mechanisms 10 are fixedly connected to both sides on the left side of the fixed plate 1. Limit components 11 are opened on both sides on the left side of the fixed plate 1. The left side of the top of the front of the second cover 7 is movably connected to a fixing mechanism 12 through a shaft pin.

[0023] Refer to Figure 1 and Figure 2, the linkage mechanism 10 includes a support block 101. The right side of the support block 101 is fixedly connected to both sides of the left side of the bottom plate. The inner side of the support block 101 is movably connected with a gear 102 through a pin. The right side of the gear 102 is meshed and connected with a first toothed plate 103. The bottom of the inner side of the first toothed plate 103 is fixedly connected to the right side of the tops of both sides of the second cover 7. The left side of the gear 102 is meshed and connected with a second toothed plate 104. The top of the inner side of the second toothed plate 104 is fixedly connected to the bottom of the right sides of both sides of the first cover 6.

[0024] As a technical optimization scheme of the present utility model, by setting the linkage mechanism 10, when the first cover 6 and the second cover 7 are combined and the pipe is wrapped by the first semi-circular groove 8 and the second semi-circular groove 9 to fully cover the mounting frame 2, as the user pulls up the second cover 7, the first toothed plate 103 moves upward together and drives the gear 102 to rotate, and then the second toothed plate 104 moves downward correspondingly, so that the first cover 6 suspended and supported by the second toothed plate 104 descends and finally automatically combines with the second cover 7. And correspondingly, when pulling down the second cover 7, the first cover 6 moves upward correspondingly, thus facilitating the user to quickly close or separate the first cover 6 and the second cover 7 and improving the operation convenience.

[0025] Reference Figure 1 and Figure 3 , the limiting component 11 includes a trapezoidal groove 111. The trapezoidal groove 111 is opened on both sides of the left side of the fixed plate 1. Trapezoidal rods 112 are fixedly connected to both sides of the right sides of the first cover 6 and the second cover 7. The surface of the trapezoidal rod 112 is slidably connected to the inner wall of the trapezoidal groove 111.

[0026] As a technical optimization scheme of the present utility model, by setting the limiting component 11, when the first toothed plate 103 and the second toothed plate 104 are driven by the gear 102 to facilitate the opening and closing of the first cover 6 and the second cover 7, as the first cover 6 and the second cover 7 move symmetrically inward or outward, the trapezoidal rods 112 on the right sides of the first cover 6 and the second cover 7 move symmetrically inward or outward along the track of the trapezoidal groove 111 in the same way. Thus, the movement track of the first cover 6 and the second cover 7 is limited and assisted, and finally the first toothed plate 103 and the second toothed plate 104 are stably meshed with the gear 102, thereby improving the stability when pulling the second cover 7 to make the first cover 6 move correspondingly.

[0027] Reference Figure 1 and Figure 3 , the fixing mechanism 12 includes a snap fastener 121. Both sides of the bottom of the back of the snap fastener 121 are movably connected to the left side of the top of the front of the second cover 7 through pins. A bump block 122 is fixedly connected to the left side of the bottom of the front of the first cover 6. The snap fastener 121 is clamped with the bump block 122. A movable rod 123 is slidably connected to the inner wall of the bump block 122.

[0028] As a technical optimization solution of the present utility model, by setting the fixing mechanism 12, when the first cover 6 and the second cover 7 are combined, and the pipe is wrapped by the first semi-circular groove 8 and the second semi-circular groove 9, so as to fully cover and wrap the mounting frame 2, the user rotates the buckle 121 on the second cover 7 until the buckle 121 catches the bump block 122 on the first cover 6, and then inserts the live rod 123 into the bump block 122 to fixedly connect the buckle 121 and the bump block 122. Subsequently, the combination connection of the first cover 6 and the second cover 7 is fixed, so that when the user loosens the second cover 7, the first cover 6 and the second cover 7 can still be stably combined, improving the operation convenience of the user.

[0029] Reference Figure 1 and Figure 2 , a stop block 13 is fixedly connected to the left side of the support block 101, and a collision block 14 is fixedly connected to the bottom outside of the second toothed plate 104.

[0030] As a technical optimization solution of the present utility model, by setting the stop block 13 and the collision block 14, during the opening process of the first cover 6 and the second cover 7, as the second cover 7 descends, the first toothed plate 103 descends together and drives the gear 102 to rotate, causing the second toothed plate 104 to move upward and push the first cover 6 upward. At the same time, as the second toothed plate 104 moves upward, the collision block 14 moves together. Subsequently, when the collision block 14 contacts the stop block 13 on the support block 101, the second toothed plate 104 is intercepted by the stop block 13 through the collision block 14, preventing the gear 102 from rotating further and thus preventing the first toothed plate 103 from disengaging from the second toothed plate 104 and affecting the subsequent use of the first cover 6 and the second cover 7. Thereby, the stability of the meshing connection between the first toothed plate 103, the second toothed plate 104 and the gear 102 during the opening process of the first cover 6 and the second cover 7 is improved.

[0031] Reference Figure 1 , a counterweight block 15 is fixedly connected to the bottom of the second cover 7, and a plurality of counterweight blocks 15 are provided and distributed at equal distances.

[0032] As a technical optimization solution of the present utility model, by setting the counterweight block 15, when the first cover 6 descends through the second cover 7, causing the first toothed plate 103 to descend together and drive the gear 102 to rotate, making the second toothed plate 104 move upward and push the first cover 6 upward, as the second cover 7 descends, the counterweight block 15 descends together. Due to the counterweight block 15, the second cover 7 is heavier than the first cover 6, and then the first cover 6 is stably lifted in suspension by the weight of the second cover 7 without the need for additional assistance from the user, thus facilitating the user to install the pipe and improving the work efficiency.

[0033] Reference Figure 3 The inner wall of the first semi-circular groove 8 is fixedly connected with a first semi-circular pad 16, and the inner wall of the second semi-circular groove 9 is fixedly connected with a second semi-circular pad 17.

[0034] As a technical optimization scheme of the present utility model, by providing the first semi-circular pad 16 and the second semi-circular pad 17, when the first cover 6 and the second cover 7 are combined and the pipeline is wrapped by the first semi-circular groove 8 and the second semi-circular groove 9 so that the mounting bracket 2 is completely wrapped, the first semi-circular pad 16 and the second semi-circular pad 17 are squeezed by the pipeline and the first semi-circular groove 8 and the second semi-circular groove 9, deforming, increasing the contact area between the first semi-circular groove 8 and the second semi-circular groove 9 and the pipeline, and reducing the gaps existing on the contact surface, thereby improving the sealing performance between the first semi-circular groove 8 and the second semi-circular groove 9 and the pipeline, preventing rainwater from penetrating into the mounting bracket 2 through the gaps on the contact surface and causing the bidirectional lead screw 4 to rust.

[0035] Working principle and usage process of the utility model: When in use, first fix the fixing plate 1 to the wall through bolts, then pass the pipeline through the mounting frame 2, and then drive the bidirectional lead screw 4 to rotate by rotating the handle 5, so that the clamping device 3 clamps and fixes the pipeline. Subsequently, lift the second cover 7 upward. As the second cover 7 moves upward, the first toothed plate 103 moves upward together, and drives the gear 102 to rotate. Subsequently, the second toothed plate 104 moves downward correspondingly, causing the first cover 6 suspended by the second toothed plate 104 to descend. At the same time, as the first cover 6 and the second cover 7 gradually move symmetrically inward, the trapezoidal rod 112 moves symmetrically inward along the track of the trapezoidal groove 111, limiting and assisting the movement track of the first cover 6 and the second cover 7, preventing the meshing connection between the first toothed plate 103 and the second toothed plate 104 and the gear 102 from separating. Finally, the first cover 6 and the second cover 7 are stably combined. Subsequently, the first semi-circular groove 8 and the second semi-circular groove 9 wrap the pipeline. At this time, rotate the fastener 121 on the second cover 7 until the fastener 121 buckles the bump block 122 on the first cover 6. Then insert the live rod 123 into the bump block 122 to fixedly connect the fastener 121 and the bump block 122. Finally, the mounting frame 2 is completely wrapped by the first cover 6 and the second cover 7, preventing the bidirectional lead screw 4 and the clamping device 3 from being corroded by rainwater during daily use after clamping and fixing the pipeline, resulting in rusting of the bidirectional lead screw 4 and the clamping device 3 and being unable to be screwed. After that, when the pipeline needs to be maintained or replaced, the user directly pulls out the live rod 123 from the bump block 122, then pulls the fastener 121 away from the bump block 122. Subsequently, due to the weight of the counterweight block 15 on the second cover 7 being heavier than that of the first cover 6, using the previous cooperation between the first toothed plate 103, the second toothed plate 104 and the gear 102, when the second cover 7 descends, the first cover 6 automatically rises together. Subsequently, the second toothed plate 104 is intercepted by the stop block 13 through the collision block 14, making the gear 102 unable to rotate anymore. Finally, the first cover 6 and the second cover 7 are opened and maintained in a fixed state. Now, the pipeline can be replaced or repaired, thus having the advantage of auxiliary protection.

[0036] To sum up: For the pipeline discharge device applied to the transformation of urban villages in cities, by setting the first cover 6 and the second cover 7, after the user rotates the rotating handle 5 to drive the bidirectional lead screw 4 to rotate and the clamping device 3 clamps the pipeline, then by combining the first cover 6 and the second cover 7, the first semi-circular groove 8 and the second semi-circular groove 9 wrap the pipeline, thereby wrapping the mounting frame 2, solving the problem that the bidirectional lead screw used to adjust the clamping device in the above-mentioned equipment is directly exposed outside, and thus will rust after being eroded by rainwater for a long time, causing the situation of rust death, making it difficult to screw the bidirectional lead screw and affecting the subsequent repair and replacement of the pipeline.

[0037] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0038] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipe discharge device used in the reconstruction of urban villages, comprising a fixing plate (1), a mounting frame (2), a clamping device (3), a bidirectional screw rod (4) and a rotating handle (5), characterized in that: The right side of the mounting frame (2) is fixedly connected to the left side of the fixing plate (1); the right side of the bidirectional screw rod (4) is movably connected to the bottom of the right side of the inner wall of the mounting frame (2) through an axle pin; the right side of the bidirectional screw rod (4) penetrates to the bottom of the left side of the mounting frame (2); the inner wall of the clamping device (3) is threadedly connected to the two sides of the surface of the bidirectional screw rod (4); the right side of the rotating handle (5) is fixedly connected to the right side of the bidirectional screw rod (4); the top of the mounting frame (2) is movably connected to a first cover (6); the top of the mounting frame (2) is provided with a second cover (7); the first cover (6) and the second cover (7) are connected to each other. The inner walls of the two covers (7) are slidably connected to the surface of the mounting frame (2); the surface of the rotating handle (5) is movably connected to the inner sides of the first cover (6) and the second cover (7); the bottoms of both sides of the first cover (6) are provided with first semicircular grooves (8); the tops of both sides of the second cover (7) are provided with second semicircular grooves (9); both sides of the left side of the fixing plate (1) are fixedly connected with linkage mechanisms (10); both sides of the left side of the fixing plate (1) are provided with limiting components (11); and the left side of the top of the front side of the second cover (7) is movably connected with a fixing mechanism (12) via an axle pin.

2. A pipeline discharge device for urban village reconstruction according to claim 1, characterized in that: The linkage mechanism (10) comprises a support block (101), the right side of the support block (101) is fixedly connected to the two sides of the left side of the bottom plate, the inner side of the support block (101) is movably connected to a gear (102) via an axle pin, the right side of the gear (102) is meshedly connected to a first toothed plate (103), the bottom of the inner side of the first toothed plate (103) is fixedly connected to the right side of the top of both sides of the second cover (7), the left side of the gear (102) is meshedly connected to a second toothed plate (104), the top of the inner side of the second toothed plate (104) is fixedly connected to the bottom of the right side of both sides of the first cover (6).

3. The pipeline discharge device used for urban village reconstruction according to claim 1 is characterized by: The limiting assembly (11) comprises a trapezoidal groove (111), the trapezoidal groove (111) being provided on both sides of the left side of the fixing plate (1), the first cover (6) and the second cover (7) being fixedly connected with trapezoidal rods (112) on both sides of the right side, the surface of the trapezoidal rod (112) being slidably connected with the inner wall of the trapezoidal groove (111).

4. The pipeline discharge device used for urban village reconstruction according to claim 1 is characterized by: The fixing mechanism (12) comprises a snap button (121), the two sides of the back bottom of the snap button (121) are movably connected to the left side of the front top of the second cover (7) through axle pins, the left side of the front bottom of the first cover (6) is fixedly connected with a convex block (122), the snap button (121) is snap-fitted with the convex block (122), and the inner wall of the convex block (122) is slidably connected with a movable rod (123).

5. The pipeline discharge device used for urban village reconstruction according to claim 2 is characterized by: A stop block (13) is fixedly connected to the left side of the support block (101), and a collision block (14) is fixedly connected to the bottom of the outer side of the second tooth plate (104).

6. The pipeline discharge device used for urban village reconstruction according to claim 1 is characterized by: A counterweight block (15) is fixedly connected to the bottom of the second cover (7), and a plurality of the counterweight blocks (15) are provided and are distributed at equal distances.

7. The pipeline discharge device used for urban village reconstruction according to claim 1 is characterized by: A first semicircular pad (16) is fixedly connected to the inner wall of the first semicircular groove (8), and a second semicircular pad (17) is fixedly connected to the inner wall of the second semicircular groove (9).

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