An eccentric reducer connector

Abstract

This application relates to the field of pipe fitting connection technology, and more particularly to an eccentric reducer pipe fitting, comprising a fixed part having a through cavity; two rotating parts having internal cavities, the two rotating parts being located on opposite sides of the fixed part, the rotating parts being rotatable relative to the fixed part, and when the rotating parts abut against the fixed part, the through cavity and the two internal cavities forming a communication path; two connecting parts for connecting to a pipe, the two connecting parts being connected to the two rotating parts respectively, and the rotation axes of the connecting parts and the rotating parts being offset, the pipe communicating with the communication path through the internal cavity of the connecting parts; and a fixing unit for fixing the rotating parts, the fixing unit being connected to the fixed part and the rotating parts being connected to the fixing part; this application has the effect of improving the adaptability of the connector to pipe fitting connections with different eccentric amplitudes.

Description

Technical Field

[0001] This application relates to the field of pipe fittings technology, and in particular to an eccentric reducer pipe fitting. Background Technology

[0002] Pipe fittings are an important part of pipeline installation, used to connect different pipe sections to ensure their sealing and flow. Pipe fittings involve a variety of technologies and methods to adapt to different application scenarios and needs, such as threaded connections, socket connections, flange connections, and heat fusion connections.

[0003] The prior art discloses a reducing steel pipe connecting fitting, which includes a base, and two sets of connecting components symmetrically arranged on the upper and lower parts of the base. Each set of connecting components includes an inner obturator mechanism and an outer clamping mechanism. The inner obturator mechanism includes a telescopic rod located on the vertical line of the base. Several inner obturator plates are arranged in a ring on the outer side of the telescopic rod. The inner obturator plates are hinged to the telescopic rod by a support rod, and the outer wall of the inner obturator plates is tightly fitted to the inner wall of the steel pipe. The outer clamping mechanism includes several outer clamping plates, which are slidably connected to the base. The several outer clamping plates are arranged in a ring and a locking sleeve is sleeved on the outer side. The inner wall of the outer clamping plates is tightly fitted to the outer wall of the steel pipe. The outer clamping plates are inclined outward on the side near the base and have threads on their outer walls. The locking sleeve is a helical tooth fastening nut, which engages with the outer clamping plate.

[0004] Regarding the aforementioned technologies, during actual installation, various factors such as dimensional deviations in pipe fasteners or dimensional deviations in pre-drilled holes at wall penetrations may cause the two steel pipes to be unable to maintain coaxiality, and the degree of eccentricity cannot be measured. As a result, the existing unequal diameter steel pipe connecting fittings cannot be adapted, thus necessitating a pipe fitting connector that can adapt to different degrees of eccentricity. Summary of the Invention

[0005] In order to improve the adaptability of the connector to pipe fittings with different eccentric amplitudes, this application provides an eccentric reducer connector.

[0006] The eccentric reducer connector provided in this application adopts the following technical solution:

[0007] An eccentric reducer connector includes:

[0008] A fixing part with a through cavity;

[0009] Two rotating parts having a content cavity are located on opposite sides of the fixed part. The rotating parts are capable of rotating relative to the fixed part, and when the rotating parts abut against the fixed part, the through cavity forms a communication path with the two content cavities.

[0010] Two connecting parts are used for connecting to the pipe, and the two connecting parts are respectively connected to the two rotating parts, and the rotation axes of the connecting parts and the rotating parts are offset. The pipe is connected to the communication path through the inner cavity of the connecting parts.

[0011] A fixing unit for fixing a rotating part, the fixing unit being connected to the fixing part and the rotating part being connected.

[0012] By adopting the above technical solution, force is applied to the rotating part, causing it to rotate. Simultaneously, the rotating part drives the connecting part to rotate. Since the rotation axes of the connecting part and the rotating part are offset, as the two rotating parts rotate relative to each other, the relative position and axial distance between the two connecting parts gradually change until the two connecting parts are directly opposite the pipes on both sides. At this point, force is applied to the rotating part through the fixing unit, causing the two rotating parts to move away from the fixing part until the rotating part and the fixing part abut against each other, forming a sealed connection path. Then, the connecting part is connected and fixed to the pipe, thus achieving the connection of the two eccentric pipes. The designed eccentric reducer connector, through the fixing part and the rotating part, can achieve relative rotation while cooperating with the fixing unit to construct a sealed connection path. Because the connecting part is offset from the rotation axis of the rotating part, the rotation of the two rotating parts allows for the adaptation and connection of pipes with different eccentricities, thereby improving the adaptability of the connector to pipes with different eccentricities. The fixing unit can fix the positions of the rotating part and the fixing part and construct a sealed connection path.

[0013] In one specific implementation, the fixing part includes

[0014] A fixing ring, which is connected to the fixing unit;

[0015] Two fixed cylinders are respectively connected to the two axial sides of the fixed ring, and a first locking ring is coaxially connected to the end of the fixed cylinder away from the fixed ring.

[0016] By adopting the above technical solution, the designed fixing part can install a fixing cylinder through a fixing ring, fix the first locking ring through the fixing cylinder, and form a through cavity through the fixing ring and the fixing cylinder.

[0017] In one specific implementation, the two fixed cylinders are arranged coaxially.

[0018] By adopting the above technical solution, the two coaxially arranged fixed cylinders can reduce flow resistance when liquid flows through the cavity.

[0019] In one specific implementation, the rotating part includes

[0020] A rotating base plate is connected to the connecting portion and also to the fixing unit;

[0021] A rotating cylinder, one end of which is connected to the rotating base plate away from the connecting part, and the other end is connected to a second locking ring. The second locking ring is located between the fixed ring and the first locking ring, and the second locking ring and the first locking ring have an overlapping area along their own axial direction.

[0022] By adopting the above technical solution, the designed rotating part can install a rotating cylinder on a rotating base plate, and fix a second locking ring on the rotating cylinder. With the cooperation of the first locking ring and the second locking ring, the distance between the fixed ring and the rotating base plate can be adjusted while realizing the relative rotation of the rotating base plate and the fixed ring. Firstly, it can facilitate the insertion of the connector between the two pipes. Secondly, it can achieve the sealing of the communication path by driving the fixed ring and the rotating base plate away from each other, and can improve the connection tightness between the connector and the pipe.

[0023] In one specific implementation, the first locking ring and the second locking ring are provided with sealing rings on one side close to each other, and the sealing rings are located in the overlapping area.

[0024] By adopting the above technical solution, the designed sealing ring can improve the sealing performance between the first locking ring and the second locking ring.

[0025] In one specific implementation, the fixing unit includes multiple fixing bolts distributed circumferentially around the fixing cylinder. The fixing bolts are threadedly connected to the rotating base plate, and the fixing bolts pass through the rotating base plate and abut against the fixing ring.

[0026] By adopting the above technical solution, the designed fixing unit can increase the distance between the fixing ring and the rotating base plate through fixing bolts, thereby making the first locking ring and the second locking ring approach each other and abut together to achieve sealing of the communication path. At the same time, the abutment of the first locking ring and the second locking ring can also achieve relative stillness between the fixing ring and the rotating base plate.

[0027] In one specific implementation, the connecting portion includes

[0028] The sliding plate has a conical hole on the rotating base plate, the conical hole is connected to the inner cavity of the rotating cylinder, the sliding plate is slidably connected to the rotating base plate, and the extension line of the sliding direction of the sliding plate passes through the axis of the conical hole.

[0029] A winding strip, one end of which is connected to the sliding piece, is wound around the outer periphery of the pipe, and after being wound multiple times, it can abut against the rotating base plate. The rotating base plate, the winding strip, and the pipe together form an injection cavity.

[0030] By adopting the above technical solution, when the rotating base plate is moved away from the fixed ring by the fixing bolt until a sealed communication path is formed, the end of the pipe abuts against the wall of the conical hole. Then, force is applied to the sliding plate to make the winding strip abut against the outer wall of the pipe. Force is then applied to the winding strip to make it wrap around the pipe and repeatedly form a layer structure. At this time, the winding strip and the rotating base plate cooperate to seal the cavity formed by the conical hole and the pipe to form a glue injection cavity. Then, sealant is injected into the glue injection cavity. After the sealant solidifies, it fills and seals the gap between the winding strip, the pipe and the rotating base plate, completing the connection of the pipe. The designed connection part can drive the winding strip to move through the sliding plate and can determine the starting winding point of the winding strip. The conical hole can realize the adaptation of pipes of different diameters. The winding strip can realize the connection with the pipe and form a glue injection cavity for glue injection and sealing.

[0031] In one specific implementation, the distance between the central axis of the conical holes on the two rotating base plates and the central axis of the rotating cylinder is equal.

[0032] By adopting the above technical solution, the two conical holes with the same distance between their central axis and the central axis of the rotating cylinder can achieve a coaxial state after rotation, thereby realizing the connection of coaxial pipe fittings.

[0033] In one specific implementation, the winding strip has a locking groove on the side near the rotating substrate, and the width of the locking groove gradually decreases towards the rotating substrate.

[0034] By adopting the above technical solution, the designed locking groove allows the sealant to enter and solidify during the adhesive injection process after the wrapping strip is finished, which can improve the connection stability between the sealant and the wrapping strip.

[0035] In one specific implementation, the rotating substrate has multiple adhesive sinks, which are connected to the inner cavity of the conical hole, and the width of the adhesive sinks gradually decreases toward the side away from the rotating cylinder.

[0036] By adopting the above technical solution, the designed adhesive sink can improve the connection stability between the sealant and the rotating substrate during the adhesive injection process.

[0037] In summary, this application includes at least one of the following beneficial technical effects:

[0038] 1. The designed eccentric reducer connector, through the fixed part and the rotating part, can achieve relative rotation while cooperating with the fixing unit to construct a sealed communication path. By the connecting part set off from the rotation axis of the rotating part, the rotation of the two rotating parts can achieve the adaptation connection of pipe fittings with different eccentricity, thereby improving the adaptability of the connector to pipe fittings with different eccentricity. The fixing unit can fix the position of the rotating part and the fixed part and construct a sealed communication path.

[0039] 2. The designed eccentric reducer connector allows for the installation of a rotating cylinder via a rotating base plate. The rotating cylinder then secures a second locking ring. Through the cooperation of the first and second locking rings, the distance between the fixed ring and the rotating base plate can be adjusted while allowing the rotating base plate and the fixed ring to rotate relative to each other. This facilitates the insertion of the connector between two pipes and enables the sealing of the connection path by driving the fixed ring and the rotating base plate away from each other. Furthermore, it improves the tightness of the connection between the connector and the pipe.

[0040] 3. The designed eccentric reducer connector can drive the winding strip to move through the sliding plate and can determine the starting point of the winding strip. The tapered hole can be used to adapt to pipes of different diameters. The winding strip can be used to connect to the pipe and form an injection cavity for glue injection and sealing. Attached Figure Description

[0041] Figure 1 This is a structural schematic diagram of the eccentric reducer connector in an embodiment of this application.

[0042] Figure 2 yes Figure 1 A schematic diagram of the structure of the central fixing part.

[0043] Figure 3 yes Figure 1 A schematic diagram of the rotating part.

[0044] Figure 4 yes Figure 1 A sectional view.

[0045] Figure 5 yes Figure 4 Enlarged schematic diagram of part A in the diagram.

[0046] Figure 6 This is a partial structural schematic diagram of the eccentric reducer connector according to an embodiment of this application.

[0047] Explanation of reference numerals in the attached drawings: 01, pipe; 1, fixing part; 11, fixing ring; 12, fixing cylinder; 13, first locking ring; 2, rotating part; 21, rotating base plate; 211, conical hole; 212, glue sink; 22, rotating cylinder; 23, second locking ring; 3, connecting part; 31, sliding piece; 32, winding strip; 321, locking groove; 4, fixing unit; 41, fixing bolt; 5, sealing ring. Detailed Implementation

[0048] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0049] This application discloses an eccentric reducer connector.

[0050] Reference Figure 1 and Figure 2 An eccentric reducer connector includes a fixing part 1, which includes a fixing ring 11, a fixing cylinder 12, and a first locking ring 13. The fixing ring 11 has a through hole in the middle, and the fixing cylinder 12 has openings at both ends. There are two fixing cylinders 12, which are coaxially welded to the axial sides of the fixing ring 11. There are also two first locking rings 13, which are coaxially connected to the two fixing cylinders 12. The first locking ring 13 is connected to the end of the fixing cylinder 12 away from the fixing ring 11. The through hole and the inner cavity of the fixing cylinder 12 form a through cavity. To avoid excessive resistance when the liquid flows in the through cavity, the two fixing cylinders 12 are coaxially arranged.

[0051] Reference Figure 1 and Figure 3 Furthermore, the eccentric reducer connector also includes two rotating parts 2, which are located on opposite sides of the fixing ring 11 and can rotate relative to the fixing ring 11. Each rotating part 2 specifically includes a rotating base plate 21, a rotating cylinder 22, and a second locking ring 23. The rotating cylinder 22 is hollow and open at both ends. The end of the rotating cylinder 22 away from the fixing ring 11 is welded and fixed to the rotating base plate 21, and the end of the rotating cylinder 22 near the fixing ring 11 is welded and fixed to the second locking ring 23. The rotating cylinder 22 and the second locking ring 23 are coaxially arranged, and the inner cavity of the rotating cylinder 22 is fitted with the rotating base plate. 21 forms an inner cavity, and the second locking ring 23 is located between the fixed ring 11 and the first locking ring 13. The second locking ring 23 and the first locking ring 13 have an overlapping area along their own axial direction, so that the first locking ring 13 and the second locking ring 23 are pressed together when the fixed ring 11 and the rotating base plate 21 move away from each other, thereby forming a sealed communication path between the through cavity and the inner cavity. In order to extend the service life of the fixed part 1 and the rotating part 2, the surfaces of the fixed ring 11, the fixed cylinder 12, the first locking ring 13, the rotating base plate 21, the rotating cylinder 22 and the second locking ring 23 are all coated with an anti-rust coating.

[0052] Reference Figure 4 Furthermore, a sealing ring 5 is provided on one side of the first locking ring 13 and the second locking ring 23 close to each other. The sealing ring 5 can be made of rubber or other materials suitable for sealing. In this embodiment, it is preferably made of rubber, and the sealing ring 5 is located in the overlapping area to improve the sealing performance between the first locking ring 13 and the second locking ring 23. In this application, when the outer diameter of the first locking ring 13 is larger than the outer diameter of the fixed cylinder 12, the outer diameter of the second locking ring 23 is smaller than the outer diameter of the rotating cylinder 22. When the outer diameter of the first locking ring 13 is smaller than the outer diameter of the fixed cylinder 12, the outer diameter of the second locking ring 23 is smaller than the outer diameter of the rotating cylinder 22. The outer diameter is larger than that of the rotating cylinder 22; the rotating cylinder 22 can be installed through the rotating base plate 21, and the second locking ring 23 can be fixed through the rotating cylinder 22. With the cooperation of the first locking ring 13 and the second locking ring 23, the distance between the fixed ring 11 and the rotating base plate 21 can be adjusted while the rotating base plate 21 and the fixed ring 11 can rotate relative to each other. First, it is convenient for the connector to extend between the two pipes 01. Second, the connection path can be sealed by driving the fixed ring 11 and the rotating base plate 21 away from each other. It can also improve the tightness of the connection between the connecting part 3 and the pipe 01.

[0053] Reference Figure 4 Furthermore, in order to achieve the tight clamping of the first locking ring 13 and the second locking ring 23 to form a closed communication path, the eccentric reducer connecting pipe also includes a fixing unit 4. The fixing unit 4 is connected to the fixing ring 11 and to the rotating base plate 21, and is used to fix the rotating base plate 21.

[0054] Reference Figure 4 Specifically, the fixing unit 4 includes multiple fixing bolts 41, which are distributed axially around the fixing cylinder 12. The fixing bolts 41 are threadedly connected to the rotating base plate 21. One end of the fixing bolt 41 passes through the rotating base plate 21 and abuts against the fixing ring 11. By rotating the fixing bolt 41, the rotating base plate 21 can move away from the fixing ring 11, thereby achieving the tight sealing of the first locking ring 13 and the second locking ring 23. The fixing bolt 41 can increase the distance between the fixing ring 11 and the rotating base plate 21, thereby causing the first locking ring 13 and the second locking ring 23 to move closer to each other and abut against each other, thereby achieving the sealing of the communication path. At the same time, the tight sealing of the first locking ring 13 and the second locking ring 23 can also achieve the relative stationarity of the fixing ring 11 and the rotating base plate 21.

[0055] Reference Figure 4 Furthermore, in order to achieve the connection with the pipe 01, the eccentric reducer connector also includes two connecting parts 3, which are respectively installed on two rotating base plates 21, and the connecting parts 3 are offset from the rotation axis of the central axis of the rotating cylinder 22.

[0056] Reference Figure 5 and Figure 6 Specifically, the connecting part 3 includes a sliding piece 31 and a winding strip 32. A conical hole 211 is provided on the rotating base plate 21. The inner diameter of the conical hole 211 gradually decreases towards the fixing ring 11 and the conical hole 211 communicates with the inner cavity of the rotating cylinder 22. A sliding groove is provided on the rotating base plate 21. The opening direction of the sliding groove is set through the central axis of the conical hole 211. The sliding piece 31 slides in the sliding groove. One end of the winding strip 32 is welded and fixed to the sliding piece 31. The winding strip 32 is wrapped around the outer periphery of the pipe 01. The winding strip 32 can be stacked to form a layered structure after repeated winding. The layered winding strip 32, the rotating base plate 21 and the pipe 01 form a glue injection cavity.

[0057] Reference Figure 4 and Figure 5 Furthermore, the distance between the central axis of the conical holes 211 opened on the two rotating base plates 21 and the central axis of the rotating cylinder 22 is equal, which can realize the coaxial state of the two conical holes 211 after rotation, thereby realizing the connection of coaxial pipes.

[0058] Reference Figure 5 and Figure 6 After the winding strip 32 is wound, sealant is injected into the injection cavity through the injection port. Once the sealant has solidified, the connection of the pipe 01 can be achieved. When the rotating base plate 21 is moved away from the fixed ring 11 by the fixing bolt 41 until a sealed connection path is formed, the end of the pipe 01 abuts against the wall of the conical hole 211. Then, force is applied to the sliding plate 31 to make the winding strip 32 abut against the outer wall of the pipe 01. Then, force is applied to the winding strip 32 to make the winding strip 32 wrap around the pipe 01 and repeatedly form a layer structure. At this time, the winding strip 32 and the rotating base plate 21 cooperate to seal the cavity formed by the conical hole 211 and the pipe 01 to form an injection cavity. Then, sealant is injected into the injection cavity. After the sealant has solidified, it fills and seals the gap between the winding strip 32, the pipe 01 and the rotating base plate 21, thus completing the connection of the pipe 01.

[0059] Reference Figure 5 and Figure 6A locking groove 321 is provided on the side of the winding strip 32 near the rotating base plate 21, and the width of the locking groove 321 gradually decreases towards the rotating base plate 21. During the glue injection after the winding strip 32 is wound, the sealant enters the locking groove 321 and solidifies, which can improve the connection stability between the sealant and the winding strip 32. At the same time, multiple glue-sinking grooves 212 are provided on the rotating base plate 21. The multiple glue-sinking grooves 212 are evenly distributed around the outer periphery of the pipe 01, and the glue-sinking grooves 212 are connected to the inner cavity of the conical hole 211. The width of the glue-sinking grooves 212 gradually decreases towards the side away from the rotating cylinder 22, which can improve the connection stability between the sealant and the rotating base plate 21 during the glue injection process. Furthermore, the positional stability of the winding strip 32 can be further improved by the cooperation of the locking groove 321 and the glue-sinking grooves 212.

[0060] The implementation principle of an eccentric reducer connector in this application embodiment is as follows: Force is applied to the rotating part 2, causing it to rotate. Simultaneously, the rotating part 2 drives the connecting part 3 to rotate. Since the rotation axes of the connecting part 3 and the rotating part 2 are offset, the relative position and axial distance between the two connecting parts 3 gradually change as the two rotating parts 2 rotate relative to each other. This continues until the two connecting parts 3 are directly aligned with the pipes 01 on both sides. The rotating base plate 21 is moved away from the fixing ring 11 by the fixing bolt 41 until a sealed communication path is formed. At this point, the end of the pipe 01 abuts against the wall of the conical hole 211. Then, force is applied to the sliding piece 31, causing the winding strip 32 to abut against the outer wall of the pipe 01. Further force is applied to the winding strip 32, causing it to wrap around the pipe 01 and repeating this process multiple times. The structure consists of layers. At this time, the winding strip 32 cooperates with the rotating base plate 21 to seal the cavity formed by the conical hole 211 and the pipe 01 to form a glue injection cavity. Then, sealant is injected into the glue injection cavity. After the sealant solidifies, it fills and seals the gap between the winding strip 32, the pipe 01 and the rotating base plate 21, thus completing the connection of the pipe 01. The fixing part 1 and the rotating part 2 can cooperate with the fixing unit 4 to build a sealed communication path while realizing relative rotation. The connecting part 3 is set off from the rotation axis of the rotating part 2. The rotation of the two rotating parts 2 can realize the adaptation connection of pipes with different eccentricity, thereby improving the adaptability of the connector to pipes with different eccentricity. The fixing unit 4 can fix the position of the rotating part 2 and the fixing part 1 and build a sealed communication path.

[0061] 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. An eccentric reducer connecting pipe fitting, characterized by: The utility model relates to a kind of pipe connection device, including: Fixed part (1) with through cavity; Two rotating parts (2) with internal cavity, two rotating parts (2) are located at opposite sides of fixed part (1) respectively, rotating part (2) can rotate relative to fixed part (1), and when rotating part (2) is abutted with fixed part (1), through cavity and two internal cavities form communication path; Two connecting parts (3) for connecting with pipeline (01), two connecting parts (3) are connected with two rotating parts (2) respectively, and the connecting part (3) is staggered with the rotation axis of rotating part (2), and pipeline (01) is communicated with communication path through the inner cavity of connecting part (3); Fixing unit (4) for fixing rotating part (2), fixing unit (4) is connected with fixed part (1), and fixing unit (4) is connected with rotating part (2); Fixed part (1) includes Fixed ring (11), fixed ring (11) is connected with fixing unit (4); Two fixed cylinders (12), two fixed cylinders (12) are connected to the axial two sides of fixed ring (11) respectively, and the first locking ring (13) is coaxially connected to the end of fixed cylinder (12) away from fixed ring (11); Rotating base plate (21), rotating base plate (21) is connected with connecting part (3), and rotating base plate (21) is connected with fixing unit (4); Rotating cylinder (22), one end of rotating cylinder (22) is connected with rotating base plate (21) away from the side of connecting part (3), and the other end is connected with second locking ring (23), and second locking ring (23) is located between fixed ring (11) and first locking ring (13), and second locking ring (23) and first locking ring (13) have overlapping area in the axial direction of itself; Fixing unit (4) includes a plurality of fixing bolts (41), a plurality of fixing bolts (41) are distributed circumferentially around fixed cylinder (12), fixing bolt (41) is threadedly connected with rotating base plate (21), and fixing bolt (41) is abutted with fixed ring (11) through rotating base plate (21). Two fixed cylinders (12) are coaxially arranged.

2. The eccentric reducing coupling of claim 1, wherein: The side of first locking ring (13) and second locking ring (23) close to each other is provided with sealing ring (5), and sealing ring (5) is located in overlapping area.

3. The eccentric reducer pipe fitting according to claim 1, wherein: Connecting part (3) includes 4. The eccentric reducer pipe fitting according to claim 1, wherein: Sliding sheet (31), taper hole (211) is formed in rotating base plate (21), taper hole (211) is communicated with the inner cavity of rotating cylinder (22), sliding sheet (31) is slidingly connected with rotating base plate (21), and the sliding direction of sliding sheet (31) is arranged through the axis of taper hole (211). ​ A winding strip (32) is connected to the sliding sheet (31) at one end, is arranged around the outer circumferential side of the pipe (01), and can abut against the rotating base plate (21) after being wound multiple times, and an injection cavity is formed among the rotating base plate (21), the winding strip (32) and the pipe (01).

5. The eccentric reducing coupling of claim 4, wherein: The distance between the central axis of the tapered hole (211) formed on the two rotating base plates (21) and the central axis of the rotating cylinder (22) is equal.

6. The eccentric reducing coupling of claim 4 wherein: The winding strip (32) is provided with a locking groove (321) on the side close to the rotating base plate (21), and the groove width of the locking groove (321) gradually decreases toward the side of the rotating base plate (21).

7. The eccentric reducer pipe fitting according to claim 4, wherein: The rotating base plate (21) is provided with a plurality of glue sink grooves (212), the glue sink grooves (212) are in communication with the inner cavity of the tapered hole (211), and the groove width of the glue sink grooves (212) gradually decreases away from the side of the rotating cylinder (22).

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