Easily disassembled and cleaned large-displacement water seal floor drain

Abstract

The application relates to a large-displacement water-seal floor drain easy to disassemble and clean, which comprises a drain pipe communicated with a sewer after installation, a base provided on the drain pipe, a water storage cavity formed in the base, the water storage cavity being communicated with the drain pipe, an overflow pipe provided in the base, the lower side of the overflow pipe being closed, a quick detachable plug-in assembly provided between the lower side of the overflow pipe and the base, a flow guide pipe provided on the upper side of the overflow pipe, the lower side of the flow guide pipe being detachably fixed on the overflow pipe, the flow guide pipe and the overflow pipe being coaxially arranged, the upper side wall of the flow guide pipe extending to the radial outside to form a baffle, the baffle being spaced from the upper end of the overflow pipe, a grating provided on the upper side of the flow guide pipe, a water storage box detachably fixed on the base, the upper side of the water storage box being open, and a floor drain panel embedded on the upper side of the water storage box. The application has the effects of simple structure and quick disassembly without tools.

Description

Technical Field

[0001] This application relates to the technical field of floor drains, and in particular to a large-capacity water-sealed floor drain that is easy to disassemble and clean. Background Technology

[0002] Floor drains are a key component of building drainage systems, primarily used for draining and discharging sewage from indoor floors, and also to prevent sewer gas from flowing back into the room. Traditional floor drains have a relatively simple structure, typically including a cover, filter screen, and water seal chamber, relying mainly on the water seal to achieve odor and insect prevention functions.

[0003] Many water-sealed floor drains are designed with drainage capacity and odor prevention in mind, but their structures are often complex and difficult to disassemble and assemble. Users typically need to use tools such as screwdrivers and wrenches to clean or maintain the drain. This not only increases maintenance costs and time but also carries the risk of damaging drain components or causing seal failure due to improper operation.

[0004] Therefore, there is an urgent need for a water-sealed floor drain that has a simple structure, can be quickly disassembled without tools, and can be cleaned and maintained by the user. Utility Model Content

[0005] In order to provide a water-sealed floor drain with a simple structure, which can be quickly disassembled without tools and can be cleaned and maintained by the user, this application provides an easy-to-disassemble and clean large-capacity water-sealed floor drain.

[0006] This application provides a technical solution for an easy-to-disassemble and clean large-capacity water-sealed floor drain, which employs the following method: A high-capacity water-sealed floor drain that is easy to disassemble and clean includes a drain pipe that connects to a sewer after installation. A base is provided on the drain pipe, and the base has a water storage cavity connected to the drain pipe. An overflow pipe is provided inside the base, with its lower side closed. A quick-detachable connector is provided between the lower side of the overflow pipe and the base. A guide pipe is provided on the upper side of the overflow pipe, and its lower side is detachably fixed to the overflow pipe. The guide pipe and the overflow pipe are coaxially arranged. The upper sidewall of the guide pipe extends radially outward to form a baffle, which is spaced apart from the upper end of the overflow pipe. A grid plate is provided on the upper side of the guide pipe. A water storage box is detachably fixed to the base, with its upper side open. A floor drain panel is embedded in the upper side of the water storage box.

[0007] By adopting the above technical solution, a base with a water storage chamber is installed on the drain pipe, and an overflow pipe and a guide pipe are coaxially arranged inside the base to form a high-capacity drainage channel. Simultaneously, baffles and grid plates extending from the guide pipe effectively divert water flow and filter impurities. The lower side of the overflow pipe is connected to the base via a quick-detachable plug-in assembly; the lower sides of the guide pipe and overflow pipe are detachable; the water storage box and base are also detachable, allowing users to disassemble and clean the inside of the floor drain without tools. This structure ensures both odor and insect prevention of the floor drain while significantly improving maintenance convenience and drainage efficiency.

[0008] Preferably, the bottom of the water storage box is formed with a base plate, the upper end of the base is formed with a top plate, a connecting pipe is provided between the water storage box and the base, a pressure plate is formed at the upper end of the connecting pipe, the lower outer side wall of the connecting pipe is threadedly connected to the upper inner side wall of the base, the pressure plate is pressed on the base plate, and the base plate is pressed on the top plate.

[0009] By adopting the above technical solution, a base plate is installed at the bottom of the water storage box, and a top plate is installed on the top of the base. A detachable sealing connection is achieved between the two via a threaded connecting pipe and a pressure plate, making the floor drain installation more stable and reliable. The cooperation between the pressure plate and the base plate creates a double-pressing effect, effectively improving sealing performance and preventing leakage. It also facilitates quick unscrewing and disassembly, reducing the steps required for cleaning and maintenance. This structure ensures that the floor drain maintains good sealing and stability even during high-volume drainage.

[0010] Preferably, the grid plate is integrally formed with the upper end of the guide pipe, the upper side of the grid plate is embedded in the upper side of the connecting pipe, the lower side of the grid plate is formed with an embedding groove, a second sealing gasket is provided in the embedding groove, and the outer side of the second sealing gasket abuts against the inner side wall of the connecting pipe.

[0011] By adopting the above technical solution, the bar screen and the upper end of the guide pipe are integrally formed, making the structure more stable and reliable, and avoiding the loosening and leakage risks caused by the assembly of multiple parts. A second sealing gasket is installed in the embedding groove on the lower side of the bar screen, which can form a sealed isolation between the bar screen and the connecting pipe, effectively preventing odors and sewage backflow. The embedded fixing method of the bar screen makes installation more convenient and improves the overall sealing performance and structural stability.

[0012] Preferably, the second sealing gasket includes a body and a flash, the flash contracting inward from top to bottom along the axial direction of the body, and the outer side of the flash abutting against the inner wall of the connecting pipe.

[0013] By adopting the above technical solution, when a water trap is installed in the sewer and the air pressure inside the trap increases, causing poor drainage or preventing normal drainage, the second sealing gasket's flash can be pushed upwards and briefly blown open under air pressure, allowing the gas accumulated in the water trap to be discharged along the connecting pipe, thereby quickly releasing the air pressure inside the pipe and restoring smooth drainage. After the air pressure is released, the flash automatically resets and adheres to the inner wall of the connecting pipe under its own elasticity, reforming the seal. This can significantly improve the odor-proof reliability and operational stability of the floor drain in complex drainage systems.

[0014] Preferably, the drain panel is provided with an installation port through which the washing machine drain pipe can pass, and a cover plate is embedded in the installation port. The installation port is coaxially arranged with the drain pipe.

[0015] By adopting the above technical solution, the washing machine drain pipe can be inserted into the water storage box from the installation port, so that the floor drain can be compatible with both washing machine drainage and ordinary floor drainage functions. The flexible switching can be achieved by embedding a cover plate, so that the floor drain can be compatible with both washing machine drainage and ordinary floor drainage functions.

[0016] Preferably, the grid sheet is formed with a guide tube, and the guide tube is coaxially arranged with the flow guide tube.

[0017] By adopting the above technical solution, after inserting the washing machine drain pipe into the water storage box, the grid on the inside of the guide pipe can be destroyed, allowing the washing machine drain pipe to be further inserted into the guide pipe, forming a deeper insertion fit. This effectively prevents the hose from shaking, falling off, and splashing back during high-flow drainage, enhancing drainage stability and improving overall reliability.

[0018] Preferably, a first sealing gasket is provided between the pressure plate and the base plate, and the first sealing gasket is sleeved on the outside of the connecting pipe.

[0019] By adopting the above technical solution, the first sealing gasket can form an axial seal during the compression assembly process. This sealing structure effectively prevents water leakage along the threaded gaps, while also absorbing assembly stress, improving sealing durability, and ensuring that the floor drain maintains good waterproof performance during long-term use.

[0020] Preferably, a groove is provided on the peripheral side of the baffle, the groove passes through the baffle from the outside to the inside, the groove is an annular groove, and a sliding groove is formed at one end of the groove. The sliding groove passes through the side of the baffle from bottom to top along the axis of the drain pipe, the sliding groove is connected to the groove, and a protrusion is formed on the connecting pipe. After the protrusion is inserted into the sliding groove from bottom to top along the axis of the drain pipe, it slides along the groove.

[0021] By adopting the above technical solution, the baffle's circumferential side is provided with an annular groove and a sliding groove structure, and the connecting pipe is formed with corresponding protrusions. The protrusions are embedded along the sliding groove and slide along the groove to achieve quick snap-fit ​​fixation. This structure makes the installation and disassembly of the guide pipe simpler and can be completed without tools, allowing users to easily perform cleaning and maintenance. At the same time, the annular snap-fit ​​structure ensures a firm assembly, prevents loosening, and improves the stability of use.

[0022] Preferably, there are multiple slots and sliding grooves arranged in a circumferential array around the axis of the guide tube, and the number of protrusions corresponds to the number of slots.

[0023] By adopting the above technical solution, multiple protrusions and corresponding slots and sliding grooves ensure uniform force distribution during assembly, guaranteeing coaxial positioning and secure locking between the guide pipe and the connecting pipe. This multi-point snap-fit ​​structure improves connection reliability, preventing loosening or displacement caused by single-point force, thereby enhancing the overall durability and sealing of the floor drain.

[0024] Preferably, the plug-in assembly includes a positioning block formed at the bottom of the base, a sleeve formed at the lower end of the overflow pipe, the sleeve being fitted onto the upper side of the positioning block, and the positioning block being disposed with the drain pipe base.

[0025] By adopting the above technical solution, the positioning block and sleeve form a stable positioning support structure. This not only facilitates accurate assembly of the overflow pipe but also prevents it from shifting or loosening during use, ensuring the sealing stability of the drainage channel and thus improving the reliability and durability of the overall drainage system.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting a quick-detachable plug-in assembly on the lower side of the overflow pipe, and connecting the guide pipe, overflow pipe, and water storage box to the base in a detachable manner, and with the threaded connection of the connecting pipe and the snap-fit ​​structure of the groove on the baffle and the connecting pipe protrusion, the floor drain forms a modular assembly. Users can quickly disassemble and assemble components such as the guide pipe, overflow pipe, and water storage box without any tools, which facilitates thorough cleaning of the water storage chamber and internal channels, significantly reducing the risk of blockage and maintenance costs; 2. The drain panel is equipped with an installation port coaxial with the guide pipe. The washing machine drain pipe can be inserted into the water storage box. When necessary, the inner grid of the guide pipe can be broken to allow the drain pipe to penetrate further into the guide pipe, forming a deeper insertion fit. This effectively prevents the hose from shaking, falling off, and backflowing and splashing when draining at high flow rates, achieving compatibility between ordinary floor drainage and washing machine drainage. The overall drainage efficiency is high and the adaptability to working conditions is strong. 3. A stable water seal is formed by the water storage chamber and the overflow pipe at the sealed lower end. At the same time, a first sealing gasket is set between the pressure plate and the bottom plate, and a second sealing gasket is embedded under the grid plate. The connection pipe thread seal and the coaxial support of the positioning block and the sleeve ensure that the entire floor drain can maintain good odor prevention, seepage prevention and structural stability during long-term use. Attached Figure Description

[0027] Figure 1 This is an isometric view of the overall structure of the easily disassembled and cleaned large-capacity water-sealed floor drain, as shown in Embodiment 1 of this application. Figure 2 This is an exploded view of the main components of the easily disassembled and cleaned large-capacity water-sealed floor drain in Embodiment 1 of this application; Figure 3 This is a cross-sectional view of the internal structure of the large-capacity water-sealed floor drain, which is easy to disassemble and clean, as shown in Embodiment 1 of this application. Figure 4 This is an isometric view of the overall structure of the easily disassembled and cleaned large-capacity water-sealed floor drain, as shown in Embodiment 2 of this application. Figure 5 This is an isometric view of the overall structure of the easily disassembled and cleaned large-capacity water-sealed floor drain, which is the main feature of Embodiment 3 of this application. Figure 6 This is an isometric view of the overall structure of the easily disassembled and cleaned large-capacity water-sealed floor drain, which is the main feature of Embodiment 4 of this application. Figure 7 This is an isometric view of the overall structure of the easily disassembled and cleaned large-capacity water-sealed floor drain, which is the main feature of Embodiment 5 of this application. Figure 8 This is an isometric view of the overall structure of the easily disassembled and cleaned large-capacity water-sealed floor drain, as shown in Embodiment 6 of this application. Figure 9 This is an isometric view of the overall structure of the easily disassembled and cleaned large-capacity water-sealed floor drain, as shown in Embodiment 7 of this application. Figure 10 This is an isometric view of the overall structure of the easily disassembled and cleaned large-capacity water-sealed floor drain, as shown in Embodiment 8 of this application. Figure 11 This is a bottom view of the bottom structure of the large-capacity water seal floor drain, which is easy to disassemble and clean, as shown in Embodiment 9 of this application.

[0028] Reference numerals: 1. Base; 11. Top plate; 2. Drain pipe; 3. Connecting pipe; 31. Pressure plate; 32. Protrusion; 33. First sealing gasket; 4. Water storage box; 41. Base plate; 42. Floor drain panel; 43. Cover plate; 51. Positioning block; 52. Sleeve; 6. Overflow pipe; 7. Guide pipe; 71. Baffle; 72. Slot; 73. Sliding groove; 8. Grille; 81. Guide pipe; 9. Second sealing gasket; 91. Body; 92. Flanged edge. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-11 This application will be described in further detail.

[0030] This application discloses an easy-to-disassemble and clean large-capacity water-sealed floor drain.

[0031] Example 1 See Figures 1-3 The easy-to-disassemble and clean large-capacity water-sealed floor drain includes a base 1, with a water storage cavity formed inside the base 1. A drain pipe 2 is connected to the base 1. After the floor drain is installed, the drain pipe 2 is connected to the sewer. There can be one to four drain pipes 2. In different embodiments, the drain pipe 2 is set at different positions on the base 1. In this embodiment, the drain pipe 2 is set directly below the base 1 on the same axis.

[0032] A top plate 11 is formed on the upper end of the base 1, and the top plate 11 extends radially outward along the base 1. A water storage box 4 is provided on the base 1, and a bottom plate 41 is formed at the bottom of the water storage box 4. A connecting pipe 3 is provided between the water storage box 4 and the base 1, and a pressure plate 31 is formed on the upper end of the connecting pipe 3, which extends radially outward along the connecting pipe 3. A first sealing gasket 33 is also fitted on the connecting pipe 3, and the pressure plate 31 presses the first sealing gasket 33, so that the first sealing gasket 33 is pressed tightly on the bottom plate 41, and the bottom plate 41 is pressed tightly on the top plate 11. A threaded section is also formed on the lower outer wall of the connecting pipe 3, and the threaded section is threadedly fixed to the upper inner wall of the base 1.

[0033] The upper side of the water storage box 4 is open, and a drain panel 42 is embedded in the upper side of the water storage box 4. The drain panel 42 has an installation opening, through which the washing machine drain pipe 2 can pass into the water storage box 4. A cover plate 43 is embedded in the installation opening. When the washing machine drain pipe 2 is not needed, the cover plate 43 maintains the filtering effect of the drain panel 42 on debris.

[0034] The base 1 is provided with a plug-in assembly, which includes a positioning block 51. The positioning block 51 is formed inside the base 1. When a drain pipe 2 is provided below the base 1, a reinforcing rib can be provided between the positioning block 51 and the side wall of the base 1 to ensure the relative position of the positioning block 51 inside the base 1.

[0035] An overflow pipe 6 is provided inside the base 1, and the overflow pipe 6 is coaxially arranged with the base 1. The lower end of the overflow pipe 6 is closed, and the upper end of the overflow pipe 6 is open. A sleeve 52 is formed at the bottom of the overflow pipe 6, and the sleeve 52 is fitted onto the positioning block 51. A guide pipe 7 is provided inside the overflow pipe 6. The upper side wall of the guide pipe 7 extends radially outward and forms a baffle 71. A reinforcing rib is provided between the baffle 71 and the outer side wall of the guide pipe 7.

[0036] A grid plate 8 is integrally formed on the upper side of the baffle 71. The upper side of the grid plate 8 is embedded in the upper side of the connecting pipe 3, and the lower side of the grid plate 8 is formed with an embedding groove. A second sealing gasket 9 is disposed in the embedding groove, and the outer side of the second sealing gasket 9 abuts against the inner wall of the connecting pipe 3. The second sealing gasket 9 includes a body 91 and a flash 92. The flash 92 shrinks inward from top to bottom along the axial direction of the body 91, and the outer side of the flash 92 abuts against the inner wall of the connecting pipe 3.

[0037] A guide tube 81 is formed on the grid plate 8, and the guide tube 81 extends downward into the guide tube 7. The guide tube 81 and the guide tube 7 are coaxially arranged.

[0038] A groove 72 is provided on the circumferential side of the baffle 71. The groove 72 passes through the baffle 71 from the outside inward. The groove 72 is an annular groove. A sliding groove 73 is formed at one end of the groove 72. The sliding groove 73 passes through the side of the baffle 71 from bottom to top along the axis of the drain pipe 2. The sliding groove 73 communicates with the groove 72. A protrusion 32 is formed on the connecting pipe 3. After the protrusion 32 is inserted into the sliding groove 73 from bottom to top along the axis of the drain pipe 2, it slides along the groove 72. There are multiple grooves 72 and sliding grooves 73 arranged in a circumferential array around the axis of the guide pipe 7. In this embodiment, four are provided. There are four corresponding protrusions 32.

[0039] Example 1 illustrates the implementation principle of an easily disassembled and cleaned high-capacity water-sealed floor drain as follows: During installation, the worker first fixes the base 1, ensuring the drain pipe 2 is connected to the sewer. The water storage box 4 is placed, and the connecting pipe 3 is tightened, causing the pressure plate 31 to press against the first sealing gasket 33, which in turn presses against the bottom plate 41. The bottom plate 41 then presses against the top plate 11, fixing the water storage box 4 relatively to the base 1. The overflow pipe 6 is placed, with the sleeve 52 fitted onto the positioning block 51. The integrally formed guide pipe 7 and the grid plate 8 are placed, aligning the sliding groove 73 with the protrusion 32. The grid plate 8 is pressed downwards, causing the protrusion 32 to slide into the slot 72. The grid plate 8 is rotated clockwise, causing the protrusion 32 to slide within the slot 72, thus fixing the guide pipe 7 relatively to the base 1. During disassembly, the user first opens the drain panel 42, grasps the grille 8, and rotates it counterclockwise along the guide pipe 7 until the four protrusions 32 correspond to the sliding grooves 73. Then, the user lifts the grille 8 and guide pipe 7 upwards and removes them. The overflow pipe 6 is then lifted to facilitate rinsing the base 1 and the inside of the water storage box 4.

[0040] Example 2 See Figure 4 The difference between this application and Embodiment 1 is that the drain pipe 2 and the base 1 are not coaxially arranged.

[0041] Example 3 See Figure 5 The difference between this application and Embodiment 1 is that the drain pipe 2 is located on any radial side of the base 1.

[0042] Example 4 See Figure 6 The difference between this application and Embodiment 1 is that there is one drain pipe 2 on the lower side of the base 1 and one drain pipe 2 on any radial side of the base 1. The two drain pipes 2 are respectively connected to the water storage cavity, and the lower drain pipe 2 is coaxially arranged with the base 1.

[0043] Example 5 See Figure 7 The difference between this application and Embodiment 1 is that there is one drain pipe 2 on the lower side of the base 1 and one drain pipe 2 on any radial side of the base 1. The two drain pipes 2 are respectively connected to the water storage cavity, and the lower drain pipe 2 is not coaxial with the base 1.

[0044] Example 6 See Figure 8 The difference between this application and Embodiment 1 is that there is one drain pipe 2 on each side of the base 1 in any radial direction, and the two drain pipes 2 are respectively connected to the water storage cavity.

[0045] Example 7 See Figure 9 The difference between this application and Embodiment 1 is that a drain pipe 2 is provided on each of any two vertical radial sides of the base 1, and the two drain pipes 2 are respectively connected to the water storage cavity.

[0046] Example 8 See Figure 10 The difference between this application and Embodiment 1 is that there is one drain pipe 2 on each of the two radial sides of the base 1, and another drain pipe 2 on the radial side perpendicular to the radial side. The three drain pipes 2 are respectively connected to the water storage cavity.

[0047] Example 9 See Figure 11 The difference between this application and Embodiment 1 is that there is one drain pipe 2 on each of any two vertical radial sides of the base 1, and the four drain pipes 2 are respectively connected to the water storage cavity.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A large-capacity water-sealed floor drain that is easy to disassemble and clean, characterized in that: Includes a drain pipe (2) that connects to the sewer after installation. A base (1) is provided on the drain pipe (2), and the base (1) has a water storage cavity connected to the drain pipe (2). An overflow pipe (6) is provided inside the base (1), with its lower side closed. A quick-detachable connector is provided between the lower side of the overflow pipe (6) and the base (1). A guide pipe (7) is provided on the upper side of the overflow pipe (6), and the lower side of the guide pipe (7) can... The guide pipe (7) and the overflow pipe (6) are coaxially arranged. The upper side wall of the guide pipe (7) extends radially outward to form a baffle (71). The baffle (71) is spaced apart from the upper end of the overflow pipe (6). A grid plate (8) is provided on the upper side of the guide pipe (7). A water storage box (4) can also be detachably fixed on the base (1). The upper side of the water storage box (4) is open. A floor drain panel (42) is embedded on the upper side of the water storage box (4).

2. The easily disassembled and cleaned large-capacity water-sealed floor drain according to claim 1, characterized in that: The bottom of the water storage box (4) is formed with a bottom plate (41), and the top of the base (1) is formed with a top plate (11). A connecting pipe (3) is also provided between the water storage box (4) and the base (1). A pressure plate (31) is formed at the top of the connecting pipe (3). The lower outer wall of the connecting pipe (3) is threaded to the upper inner wall of the base (1). The pressure plate (31) is pressed on the bottom plate (41), and the bottom plate (41) is pressed on the top plate (11).

3. The easily disassembled and cleaned large-capacity water-sealed floor drain according to claim 2, characterized in that: The grid plate (8) is integrally formed with the upper end of the guide pipe (7). The upper side of the grid plate (8) is embedded on the upper side of the connecting pipe (3). The lower side of the grid plate (8) is formed with an embedding groove. A second sealing gasket (9) is provided in the embedding groove. The outer side of the second sealing gasket (9) abuts against the inner wall of the connecting pipe (3).

4. The easily disassembled and cleaned large-capacity water-sealed floor drain according to claim 3, characterized in that: The second sealing gasket (9) includes a body (91) and a flash (92). The flash (92) is contracted from top to bottom and inward along the axial direction of the body (91). The outer side of the flash (92) abuts against the inner wall of the connecting pipe (3).

5. The easily disassembled and cleaned large-capacity water-sealed floor drain according to claim 1, characterized in that: The drain panel (42) is provided with an installation port through which the washing machine drain pipe (2) can pass. A cover plate (43) is embedded in the installation port, and the installation port is coaxially arranged with the guide pipe (7).

6. The easily disassembled and cleaned large-capacity water-sealed floor drain according to claim 2, characterized in that: The grid plate (8) is formed with a guide tube (81), and the guide tube (81) is coaxially arranged with the flow guide tube (7).

7. The easily disassembled and cleaned large-capacity water-sealed floor drain according to claim 2, characterized in that: A first sealing gasket (33) is provided between the pressure plate (31) and the base plate (41), and the first sealing gasket (33) is sleeved on the outside of the connecting pipe (3).

8. The easily disassembled and cleaned large-capacity water-sealed floor drain according to claim 2, characterized in that: The baffle (71) has a slot (72) on its peripheral side. The slot (72) passes through the baffle (71) from the outside to the inside. The slot (72) is an annular groove. One end of the slot (72) is formed with a sliding groove (73). The sliding groove (73) passes through the side of the baffle (71) from bottom to top along the axis of the drain pipe (2). The sliding groove (73) is connected to the slot (72). The connecting pipe (3) has a protrusion (32). After the protrusion (32) is inserted into the sliding groove (73) from bottom to top along the axis of the drain pipe (2), it slides along the slot (72).

9. A large-capacity water-sealed floor drain that is easy to disassemble and clean according to claim 8, characterized in that: The slots (72) and sliding grooves (73) are arranged in a circumferential array around the axis of the guide tube (7), and the number of protrusions (32) corresponds to the number of slots (72).

10. The easily disassembled and cleaned large-capacity water-sealed floor drain according to claim 1, characterized in that: The plug-in assembly includes a positioning block (51) formed on the bottom of the base (1), and a sleeve (52) formed on the lower end of the overflow pipe (6). The sleeve (52) is fitted on the upper side of the positioning block (51), and the positioning block (51) is coaxially arranged with the base (1).

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