A detachable friction plate

Abstract

This invention discloses a detachable friction pad, belonging to the field of friction pad technology. It includes an installation assembly with an arc-shaped structure, and connecting assemblies are fixedly installed between the installation assemblies. The installation assemblies are fixedly connected to each other via the connecting assemblies. Each installation assembly includes an installation plate, with friction assemblies evenly inserted into one side of the installation plate, and a fixing assembly installed on the other side of the installation plate. Both sides of the connecting assembly, one side of the installation plate, and one side of the fixing assembly are all on the same horizontal plane as one side of the installation plate. During use, the friction assemblies are easily fixed using the pull rod and pull head in the fixing assembly, connecting the friction assemblies to the installation assembly. This also facilitates the individual replacement of severely worn friction assemblies. Gaps exist between the friction assemblies to facilitate rapid heat dissipation and prevent heat accumulation. Furthermore, the fixing and connecting assemblies ensure high stability and ease of use during operation.

Description

Technical Field

[0001] This invention relates to a detachable friction pad, belonging to the field of friction pad technology. Background Technology

[0002] Friction plates are widely used in automotive parts such as clutches and brakes for engagement and disengagement. Friction plates are components composed of a chip and friction linings or layers of friction material, and are widely used in mechanical engineering, mechanical parts, and clutches. Currently, friction plates are often installed as a single piece for a single friction area. However, over long-term use, frequent changes in force or friction position can lead to varying wear patterns in different areas. When wear occurs, the entire friction plate needs to be disassembled and replaced, resulting in high costs and difficulties in disassembly. Therefore, detachable friction plates are now available on the market.

[0003] For example, the disclosure number is CN105782302A, which describes a detachable friction plate structure. This structure is simple and can effectively prevent wear of the oil guide grooves of the friction plate, resulting in good performance and long service life. It includes a friction plate body, on which spiral grooves are provided at equal intervals along the circumference on the annular surface of the friction plate body, and grooves are provided at equal intervals along the radial direction of the friction plate body. A detachable oil groove is embedded in the groove, and the oil groove communicates with the spiral groove.

[0004] For example, publication number CN205978203U discloses a detachable friction plate, comprising a base plate, multiple fan-shaped friction segments, and a noise-absorbing plate. The multiple friction segments are arranged in a ring on the front side of the base plate, and each friction segment is fixed to the base plate by rivets. Each friction segment has a warning hole and a limit hole on its circumferential surface. The warning hole and limit hole on each friction segment radially penetrate the segment. The centerline of the warning hole and the centerline of the limit hole on the same friction segment are located on different planes. The back side of the base plate has a ring-shaped noise-absorbing plate, which is fixed to the base plate by rivets. The base plate has at least four circular through holes near its center. The advantages of this technical solution are: simple structure, easy assembly, good heat dissipation and handling performance of the friction plate, smooth disengagement, and low braking noise.

[0005] For example, publication number CN201382109Y discloses a detachable clutch friction plate, which consists of a steel core plate and friction lining surfaces disposed on the upper and lower surfaces of the steel core plate. The upper and lower end faces of the friction lining surfaces have concentric annular grooves and radially distributed heat dissipation grooves. Fixing through holes are provided at the heat dissipation grooves. Riveting holes corresponding to the fixing through holes are provided on the friction lining surfaces. The friction lining surfaces are riveted to the steel core plate through the riveting holes and fixing through holes. This design effectively reduces the surface temperature of the friction lining surfaces during operation, ensuring continuous operation without impact and significantly improving the service life of the clutch friction plate. Furthermore, when the friction lining surfaces are worn, they can simply be removed from the steel core plate and replaced with new friction lining surfaces, further improving the utilization rate of some components and reducing replacement costs for users when replacing clutch friction plates.

[0006] However, during use, the stability after disassembly and assembly is poor, and the friction points are relatively concentrated, which makes it difficult to dissipate heat in time. It is also inconvenient to replace the local friction points, making it inconvenient to use. Summary of the Invention

[0007] The purpose of this invention is to provide a detachable friction plate to solve the above-mentioned problems. This allows for easy replacement of individual friction components, and the gaps between the friction components facilitate rapid heat dissipation. After installation, the plate is fixed by connecting and fixing components, improving stability and ease of use.

[0008] This invention achieves the above-mentioned objective through the following technical solution: a detachable friction pad, comprising an mounting assembly, the mounting assembly having an arc-shaped structure, and a connecting assembly fixedly mounted between the mounting assemblies, the mounting assemblies being fixedly connected to each other via the connecting assembly. Each mounting assembly includes a mounting plate, with friction components evenly inserted into one side of the mounting plate, and a fixing assembly mounted on the other side of the mounting plate. The friction components are fixedly mounted on the mounting plate via the fixing assembly, the friction end of the friction component protruding from one side of the mounting plate, and both sides of the connecting assembly and one side of the mounting plate, as well as one side of the fixing assembly, are all on the same horizontal plane as one side of the mounting plate. In use, first insert one end of the fixing assembly into the mounting plate, then insert one end of the friction component into one side of the mounting plate, and rotate the friction component to... One end of the friction component is engaged with one end of the fixing component. The fixing component is then tightened to fix the friction component to the mounting plate. The mounting plates are then engaged end-to-end and secured with external screws. The connecting component is then fixedly installed at the connection point of the mounting plates to further secure them and improve stability after connection. The annular structure formed between the mounting plates is then fixed to an external device to form a friction plate for use. The friction component provides friction. During prolonged use, when the friction component wears down, the severely worn component is replaced. During replacement, the mounting plates are disassembled to separate them, allowing for easy disassembly and replacement of the friction component. This process is convenient and easy to use.

[0009] Preferably, to facilitate assembly into a friction plate, the mounting plate has an arc-shaped structure, and four mounting plates are connected end-to-end to form a ring structure. A first blind groove is evenly formed on one side of the mounting plate, and one end of the friction assembly is inserted into the first blind groove. A second blind groove is formed on the other side of the mounting plate opposite to the first blind groove, and the fixing assembly is inserted into the second blind groove. Through holes are evenly formed on the mounting plate between the first and second blind grooves. One end of the fixing assembly passes through the through hole and extends into the first blind groove to be fixedly connected to the friction assembly. An installation notch is formed at the middle of the outer side of the mounting plate, and the installation notch has a convex shape. A first connection notch is formed on the upper side of one end of the mounting plate, and a connection notch is formed on the lower side of the other end of the mounting plate. A second connecting notch is provided, and the depth of both the first and second connecting notches is located at half the length of the mounting piece, and the first and second connecting notches match each other. Pin holes are provided on both sides of the interior of the first connecting notch, extending to the other side of the mounting piece. Pin rods are fixedly installed on both sides of the interior of the second connecting notch, with the diameter of the pin rod being the same as the diameter of the pin hole. A tapered threaded hole is provided at the middle of one end of the pin rod, and a cross-shaped perforated groove is provided at one end of the pin rod near the threaded hole. Auxiliary notches are provided on the outer sides of both ends of the mounting piece, with the length of the auxiliary notch being half the length of the connecting assembly. A connecting threaded groove is provided inside the auxiliary notch, and one end of the connecting assembly is threaded into the connecting threaded groove.

[0010] In use, one end of the fixing component passes through the through hole from the inside of the first blind groove and extends into the inside of the second blind groove, leaving one end of the fixing component inside the first blind groove. When installing the friction component, one end of the friction component is inserted into the inside of the first blind groove, and then the friction component is rotated to engage with the fixing component. The fixing component is then twisted to fix the fixing component to the friction component, facilitating the fixation of the friction component. When fixing the mounting pieces, the first... The connecting notch and the second connecting notch engage, allowing the pin to be inserted into the pin hole. An external screw is threaded into the threaded hole, which has a tapered structure. When the screw is tightened, one end of the pin expands through the slotted area, fixing the mounting pieces together. During disassembly, the screw is unscrewed, and an external clamping tool is used to restore the slotted area to its original position, facilitating the separation of the mounting pieces. After the mounting pieces are connected, the connecting assembly is threaded into the threaded groove inside the auxiliary notch, improving the stability of the connection between the mounting pieces, making it easy to use and install.

[0011] Preferably, to improve stability after assembly, the connecting component includes a connecting block with countersunk holes on both sides. A connecting bolt is inserted into the countersunk hole. The connecting block is engaged with the auxiliary notch. The length of the connecting block is twice that of the auxiliary notch. The connecting bolt is threaded into the connecting thread groove. In use, the connecting block is engaged with the auxiliary notch, and the connecting bolt is threaded into the connecting thread groove, thereby fixing the two mounting pieces together and improving the stability of the connection.

[0012] Preferably, to facilitate the provision of frictional force, the friction assembly includes a fixing plate, and a friction block is fixedly installed on one side of the fixing plate. The friction block has a cylindrical structure. A connecting rod is uniformly fixedly installed on the other side of the fixing plate, and a connecting plate is fixedly installed at the other end of the connecting rod. The fixing plate and the connecting plate are inserted into the interior of the first blind groove, and the connecting plate has a waist hole. The diameter of one end of the waist hole is larger than the diameter of the other end. In use, frictional force is provided through the friction block. By inserting the fixing plate and the connecting plate into the interior of the first blind groove, and by rotating the friction block, the connecting plate rotates, thereby causing the waist hole to rotate. This facilitates turning one end of the fixing assembly through the end with the larger diameter of the waist hole to the end with the smaller diameter, making it easier to fix.

[0013] Preferably, to facilitate the fixing of the friction assembly, the fixing assembly includes a pull rod inserted into the through hole. A pull head is fixedly installed at one end of the pull rod, extending through the waist hole to between the fixing piece and the connecting piece. The pull head is pressed against the upper part of the other end of the waist hole. One end of the pull rod is located inside the second blind groove, and a tensioning screw is threaded onto one end of the pull rod. One end of the tensioning screw is pressed against the interior of the second blind groove. The fixing assembly also includes a rubber plug with a groove on one side. The rubber plug is inserted into the interior of the second blind groove, and one end of the pull rod and the tensioning screw are both located inside the groove. The pull rod and the pull head are engaged inside the waist hole. By tightening the tensioning screw, the pull head is tightened against the connecting piece, thus facilitating the fixing of the friction assembly. After fixing, the rubber plug is inserted into the second blind groove to protect one end of the pull rod and the tensioning screw.

[0014] The beneficial effects of this invention are: during use, the friction component is easily fixed by the pull rod and pull head in the fixing component, so that the friction component is connected to the mounting component. During use, it is easy to replace a single friction component with severe wear. Moreover, there are gaps between the friction components, which facilitates rapid heat dissipation and avoids heat accumulation. Furthermore, the fixing component and connecting component provide high stability during use and make it easy to use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the overall structure of the present invention after it has been flipped.

[0017] Figure 3 This is a schematic diagram of the structure after the components of the present invention are assembled.

[0018] Figure 4 This is a schematic diagram of the installation components in this invention.

[0019] Figure 5 This is a schematic diagram of the structure after the mounting components are flipped in this invention.

[0020] Figure 6 This is a partial structural diagram of the mounting plate in this invention.

[0021] Figure 7 This is a partial structural diagram of the connecting component in this invention.

[0022] Figure 8This is a partial structural diagram of the friction component and the fixing component in this invention.

[0023] Figure 9 This is a schematic diagram of the friction assembly in this invention.

[0024] Figure 10 This is a schematic diagram of the structure of the rubber stopper in this invention.

[0025] In the diagram: 1. Mounting component; 101. Mounting piece; 102. First blind groove; 103. Second blind groove; 104. Through hole; 105. Mounting notch; 106. First connection notch; 107. Second connection notch; 108. Pin hole; 109. Pin rod; 1010. Threaded hole; 1011. Flower groove; 1012. Auxiliary notch; 1013. Threaded groove;

[0026] 2. Connecting components; 201. Connecting block; 202. Countersunk hole; 203. Connecting bolt;

[0027] 3. Friction assembly; 301. Fixing plate; 302. Friction block; 303. Connecting rod; 304. Connecting plate; 305. Waist hole;

[0028] 4. Fixing components; 401. Pull rod; 402. Pull head; 403. Tensioning screw; 404. Rubber plug; 405. Groove. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1-10As shown, a detachable friction pad includes a mounting assembly 1, which has an arc-shaped structure. A connecting assembly 2 is fixedly mounted between the mounting assemblies 1, and the mounting assemblies 1 are fixedly connected to each other via the connecting assembly 2. The mounting assembly 1 includes a mounting plate 101, with friction components 3 evenly inserted into one side of the mounting plate 101, and a fixing assembly 4 mounted on the other side of the mounting plate 101. The friction components 3 are fixedly mounted on the mounting plate 101 via the fixing assembly 4. The friction end of the friction component 3 protrudes from one side of the mounting plate 101. Both sides of the connecting assembly 2, one side of the mounting plate 101, and one side of the fixing assembly 4 are all on the same horizontal plane as one side of the mounting plate 101. In use, first insert one end of the fixing assembly 4 into the mounting plate 101, then insert one end of the friction component 3 into one side of the mounting plate 101, and rotate the friction component 3 so that the friction component 3... One end of the friction component 3 is engaged with one end of the fixing component 4. Then, the fixing component 4 is screwed to fix the friction component 3 to the mounting plate 101. The mounting plates 101 are then engaged end to end and fixed with external screws. The connecting component 2 is then fixedly installed at the connection position of the mounting plates 101 to fix the mounting plates 101 together and improve the stability after connection. The annular structure formed between the mounting plates 101 is then fixedly installed on an external device to form a friction plate for use. Friction is provided by the friction component 3. When the friction component 3 wears down after long-term use, the severely worn friction component 3 is replaced. When replacing it, the mounting plates 101 are disassembled to separate them. The friction component 3 is then disassembled and replaced, which is convenient for operation and use.

[0031] like Figure 3-6As shown, the mounting plate 101 has an arc-shaped structure, and four mounting plates 101 are connected end to end to form a ring structure. A first blind groove 102 is evenly provided on one side of the mounting plate 101. One end of the friction component 3 is inserted into the first blind groove 102. A second blind groove 103 is provided on the other side of the mounting plate 101 opposite to the first blind groove 102. A fixing component 4 is inserted into the second blind groove 103. Through holes 104 are evenly provided on the mounting plate 101 between the first blind groove 102 and the second blind groove 103. One end of the fixing component 4 passes through the through hole 104 and extends into the first blind groove 102 to be fixedly connected to the friction component 3. A mounting notch 105 is provided at the middle of the outer side of the mounting plate 101, and the mounting notch 105 has a convex structure. A first connecting notch 106 is provided on the upper side of one end of the mounting plate 101, and a second connecting notch 107 is provided on the lower end of the other side of the mounting plate 101. The depths of the first connecting notch 106 and the second connecting notch 107 are both located at half the depth of the mounting piece 101, and the first connecting notch 106 and the second connecting notch 107 are matched. The first connecting notch 106 has pin holes 108 on both sides inside, and the pin holes 108 extend to the other side of the mounting piece 101. The second connecting notch 107 has pins 109 fixedly installed on both sides inside. The diameter of the pins 109 is the same as the diameter of the pin holes 108, and a tapered threaded hole 1010 is opened at the middle position of one end of the pins 109. A cross-shaped slot 1011 is opened at one end of the pins 109 located at the threaded hole 1010. The mounting piece 101 has auxiliary notches 1012 on both outer sides at both ends, and the length of the auxiliary notches 1012 is half the length of the connecting component 2. A connecting thread groove 1013 is opened inside the auxiliary notches 1012, and one end of the connecting component 2 is threaded into the connecting thread groove 1013.

[0032] In use, one end of the fixing component 4 passes through the through hole 104 from the inside of the first blind groove 102 and extends into the inside of the second blind groove 103, leaving one end of the fixing component 4 inside the first blind groove 102. When installing the friction component 3, one end of the friction component 3 is inserted into the inside of the first blind groove 102, and then the friction component 3 is rotated to engage one end of the friction component 3 with the fixing component 4. The fixing component 4 is then twisted to fix the fixing component 4 to the friction component 3, facilitating the fixation of the friction component 3. When fixing the mounting pieces 101, the first connection notch 106 and the second connection notch between the two mounting pieces 101 are used. The pins 107 engage with each other, allowing the pin 109 to be inserted into the pin hole 108 and the external screw to be threaded into the threaded hole 1010. The threaded hole 1010 has a tapered structure, so when the screw is tightened, one end of the pin 109 expands through the slot 1011, fixing the mounting pieces 101 together. When disassembling, the screw is unscrewed, and an external clamping tool is used to restore the slot 1011 to its original position, making it easy for the mounting pieces 101 to detach. After the mounting pieces 101 are connected, the connecting component is threaded into the threaded groove 1013 inside the auxiliary notch 1012, improving the stability of the connection between the mounting pieces 101, making it easy to use and install.

[0033] like Figure 7 As shown, the connecting component 2 includes a connecting block 201, and countersunk holes 202 are provided on both sides of the connecting block 201. A connecting bolt 203 is inserted into the countersunk hole 202. The connecting block 201 is snapped into the auxiliary notch 1012. The length of the connecting block 201 is twice that of the auxiliary notch 1012. The connecting bolt 203 is threaded into the connecting thread groove 1013. In use, the connecting block 201 is snapped into the auxiliary notch 1012, and the connecting bolt 203 is threaded into the connecting thread groove 1013, thereby fixing the two mounting pieces 101 together and improving the stability of the connection.

[0034] like Figure 9As shown, the friction assembly 3 includes a fixing plate 301, and a friction block 302 is fixedly installed on one side of the fixing plate 301. The friction block 302 has a cylindrical structure. A connecting rod 303 is evenly fixedly installed on the other side of the fixing plate 301, and a connecting plate 304 is fixedly installed on the other end of the connecting rod 303. The fixing plate 301 and the connecting plate 304 are inserted into the first blind groove 102. A waist hole 305 is provided on the connecting plate 304. The diameter of one end of the waist hole 305 is larger than the diameter of the other end. In use, friction is provided by the friction block 302. By inserting the fixing plate 301 and the connecting plate 304 into the first blind groove 102 and rotating the friction block 302, the connecting plate 304 is rotated, which in turn causes the waist hole 305 to rotate. This makes it easy to turn one end of the fixing assembly 4 from the end with the larger diameter of the waist hole 305 to the end with the smaller diameter, which is convenient for fixing.

[0035] like Figure 8 and Figure 10 As shown, the fixing component 4 includes a pull rod 401, which is inserted into the through hole 104. A pull head 402 is fixedly installed at one end of the pull rod 401. The pull head 402 extends through the waist hole 305 to the space between the fixing piece 301 and the connecting piece 304, and is pressed against the other end of the waist hole 305. One end of the pull rod 401 is located inside the second blind groove 103, and a tensioning screw 403 is threaded onto one end of the pull rod 401. One end of the tensioning screw 403 is pressed against the interior of the second blind groove 103. The fixing component 4 also includes a rubber plug 404, and one end of the rubber plug 404... A groove 405 is provided on the side, and a rubber plug 404 is inserted into the second blind groove 103. One end of the pull rod 401 and the tension screw 403 are both located inside the groove 405. The pull rod 401 and the pull head 402 are engaged inside the waist hole 305 by the pull rod 401 and the pull head 402. By turning the tension screw 403, the pull head 402 is pulled tight with the connecting piece 304, which facilitates the fixing of the friction assembly 3. After fixing, the rubber plug 404 is inserted into the second blind groove 103 to protect one end of the pull rod 401 and the tension screw 403.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A detachable friction plate, characterized by: The system includes an installation component (1), which has an arc-shaped structure. A connecting component (2) is fixedly installed between the installation components (1). The installation components (1) are fixedly connected to each other through the connecting component (2). The installation component (1) includes an installation piece (101). A friction component (3) is evenly inserted into one side of the installation piece (101). A fixing component (4) is installed on the other side of the installation piece (101). The friction component (3) is fixedly installed on the installation piece (101) through the fixing component (4). The friction end of the friction component (3) protrudes from one side of the installation piece (101). Both sides of the connecting component (2) and one side of the installation piece (101) and one side of the fixing component (4) are all on the same horizontal plane as one side of the installation piece (101). The mounting plate (101) has an arc-shaped structure, and the four mounting plates (101) are connected end to end to form a ring structure. A first blind groove (102) is evenly provided on one side of the mounting plate (101). One end of the friction component (3) is inserted into the inside of the first blind groove (102). A second blind groove (103) is provided on the other side of the mounting plate (101) at a position opposite to the first blind groove (102). The fixing component (4) is inserted into the inside of the second blind groove (103). A through hole (104) is evenly provided on the mounting plate (101) between the first blind groove (102) and the second blind groove (103). One end of the fixing component (4) passes through the through hole (104) and extends into the inside of the first blind groove (102) to be fixedly connected to the friction component (3). The friction assembly (3) includes a fixing plate (301), and a friction block (302) is fixedly installed on one side of the fixing plate (301). The friction block (302) is a cylindrical structure. A connecting rod (303) is evenly fixedly installed on the other side of the fixing plate (301), and a connecting plate (304) is fixedly installed on the other end of the connecting rod (303). The fixing plate (301) and the connecting plate (304) are inserted into the interior of the first blind groove (102), and a waist hole (305) is opened on the connecting plate (304). The diameter of one end of the waist hole (305) is larger than the diameter of the other end.

2. A detachable friction plate according to claim 1, characterized in that: An installation notch (105) is provided at the middle of the outer side of the mounting piece (101), and the installation notch (105) is a convex structure. A first connection notch (106) is provided on the upper side of one end of the mounting piece (101), and a second connection notch (107) is provided on the lower end of the other side of the mounting piece (101). The depth of the first connection notch (106) and the second connection notch (107) are both located at half the depth of the mounting piece (101), and the first connection notch (106) and the second connection notch (107) match each other.

3. A detachable friction plate according to claim 2, characterized in that: The first connecting notch (106) has pin holes (108) on both sides inside, and the pin holes (108) extend to the other side of the mounting piece (101). The second connecting notch (107) has pins (109) fixedly installed on both sides inside. The diameter of the pins (109) is the same as the diameter of the pin holes (108). A tapered threaded hole (1010) is opened at the middle position of one end of the pins (109). A cross-shaped flower groove (1011) is opened on one end of the pins (109) at the end of the threaded hole (1010).

4. A detachable friction plate according to claim 1, wherein: The mounting plate (101) has auxiliary notches (1012) on both outer sides, and the length of the auxiliary notches (1012) is half the length of the connecting component (2). The auxiliary notches (1012) have connecting thread grooves (1013) inside, and one end of the connecting component (2) is threaded into the connecting thread grooves (1013).

5. A detachable friction pad according to claim 4, characterized in that: The connecting component (2) includes a connecting block (201), and countersunk holes (202) are provided on both sides of the connecting block (201). A connecting bolt (203) is inserted into the countersunk hole (202). The connecting block (201) is snapped into the auxiliary notch (1012). The length of the connecting block (201) is twice that of the auxiliary notch (1012). The connecting bolt (203) is threaded into the connecting thread groove (1013).

6. A detachable friction pad according to claim 1, characterized in that: The fixing component (4) includes a pull rod (401), which is inserted into the through hole (104). A pull head (402) is fixedly installed at one end of the pull rod (401). The pull head (402) extends through the waist hole (305) to the space between the fixing piece (301) and the connecting piece (304). The pull head (402) is pressed against the other end of the waist hole (305). One end of the pull rod (401) is located inside the second blind groove (103), and a tension screw (403) is threaded onto one end of the pull rod (401). One end of the tension screw (403) is pressed against the inside of the second blind groove (103).

7. A detachable friction pad according to claim 6, characterized in that: The fixing component (4) also includes a rubber plug (404), and a groove (405) is provided on one side of the rubber plug (404). The rubber plug (404) is inserted into the inside of the second blind groove (103), and one end of the pull rod (401) and the tension screw (403) are both located inside the groove (405).

Images