A high-efficiency separation device for rubber particles and steel wires after waste tire shredding

Abstract

This utility model discloses a high-efficiency separation device for rubber particles and steel wires after waste tires are crushed, comprising: a crushing mechanism, including a first support, a crushing box mounted on the top of the first support, a feed inlet at the top of the crushing box, a discharge outlet at the bottom of the crushing box, and a multi-stage crushing assembly installed inside the crushing box; a conveying assembly mounted on the first support, with the feed end and discharge outlet connected by a Venturi tube; a transmission assembly mounted on the first support; a composite drum separation assembly, including a second support, a sorting trough mounted on the top of the second support, a permanent magnet and electromagnetic composite drum rotatably connected inside the sorting trough, and a drive assembly mounted on the second support; and a screening assembly mounted at the bottom of the sorting trough. This utility model can recycle waste tires, avoiding pollution of soil, water sources, and air caused by waste tires, and has good environmental benefits.

Description

Technical Field

[0001] This utility model relates to the field of waste tire recycling and processing technology, and in particular to a device for efficiently separating rubber particles and steel wires after waste tires are crushed. Background Technology

[0002] Waste tire recycling is an important issue in the environmental protection field. Currently, the process of producing rubber powder from waste tires involves separating the tire bead from the tire, cutting it into strips and blocks, and then directly crushing the chopped tires into a fine powder of 30-32 mesh. This fine powder is then subjected to magnetic separation to obtain iron shavings and rubber powder. However, existing technologies have the following problems:

[0003] Low separation efficiency: Steel wire and rubber particles are prone to sticking together, resulting in incomplete separation.

[0004] High temperature problem: A lot of heat is generated during the crushing process, which causes the equipment temperature to rise, affecting the equipment life and separation effect.

[0005] Insufficient adaptability: The throat size of the venturi tube is fixed and cannot adapt to different throughput requirements.

[0006] Magnetic field fixation: Fixed strong magnetic roller cannot handle sudden large quantities of rubber particles and steel wire mixtures;

[0007] High energy consumption: Traditional cooling methods (such as air cooling or water cooling) are energy-intensive and may contaminate rubber particles.

[0008] Therefore, there is an urgent need for a high-efficiency and energy-saving device for separating rubber particles from steel wires. Utility Model Content

[0009] The purpose of this invention is to provide a highly efficient device for separating rubber particles and steel wires after waste tires are crushed, so as to solve the problems existing in the prior art.

[0010] To achieve the above objectives, this utility model provides the following solution: This utility model provides a high-efficiency separation device for rubber particles and steel wires after waste tire pulverization, comprising:

[0011] A crushing mechanism, comprising a first support, a crushing box mounted on the top of the first support, a feed inlet at the top of the crushing box, a discharge outlet at the bottom of the crushing box, and a multi-stage crushing assembly installed inside the crushing box;

[0012] A conveying assembly is mounted on the first support and is located below the crushing box. The inlet end of the conveying assembly corresponds to the outlet end. The inlet end and the outlet end are connected by a venturi tube, and the throat portion of the venturi tube is provided with a reducing component.

[0013] A transmission assembly is mounted on the first bracket, and the multi-stage crushing assembly and the conveying assembly are both driven by the transmission assembly.

[0014] A composite roller separation assembly includes a second support, which is mounted on one side of a first support. A sorting trough is mounted on the top of the second support. A permanent magnet and electromagnetic composite roller are rotatably connected inside the sorting trough. A drive assembly is mounted on the second support, and the drive assembly is in transmission cooperation with the permanent magnet and electromagnetic composite roller. A through groove is opened at the bottom of the sorting trough. The output end of the conveying assembly is arranged corresponding to the feed end of the permanent magnet and electromagnetic composite roller.

[0015] A screening assembly is installed at the bottom of the sorting trough and is arranged correspondingly to the through trough.

[0016] According to the efficient separation device for rubber particles and steel wires after waste tire crushing provided by this utility model, the multi-stage crushing component includes a multi-stage crushing roller group, which is arranged sequentially along the feeding direction. Each crushing roller group includes two symmetrically arranged crushing rollers. The crushing rollers are rotatably connected to the crushing box through a rotating shaft, and one end of the rotating shaft passes through the crushing box and extends out.

[0017] According to the efficient separation device for rubber particles and steel wires after waste tire crushing provided by this utility model, the conveying assembly includes a conveying box fixedly connected to the first support, an auger rotatably connected inside the conveying box, one end of the auger passing through the side wall of the conveying box, the top of the conveying box being arranged corresponding to the discharge port, and the discharge end of the conveying box being connected to the feed end of the permanent magnet and electromagnetic composite roller.

[0018] According to the efficient separation device for rubber particles and steel wires after waste tire crushing provided by this utility model, the transmission component includes a first motor fixedly connected to the first bracket, a drive sprocket fixedly connected to the output end of the first motor, and driven sprockets respectively installed at the end of the auger and the end of the rotating shaft. The drive sprocket and the driven sprocket are respectively connected by chain transmission.

[0019] According to the efficient separation device for rubber particles and steel wires after waste tire crushing provided by this utility model, the driving component includes a second motor fixedly connected to the second bracket, a first pulley fixedly connected to the output shaft of the second motor, an arm fixedly fixed inside the permanent magnet and electromagnetic composite drum, an mounting shaft fixedly connected to the arm, a second pulley fixedly connected to one end of the mounting shaft, and the first pulley and the second pulley are connected by belt drive.

[0020] According to the present invention, the efficient separation device for rubber particles and steel wires after waste tire crushing includes a screening assembly comprising a screening plate rotatably connected to the bottom of the sorting tank, a tapered structure at the end of the screening plate, a support plate fixedly connected to the top of the screening plate, two sets of pull rods symmetrically rotatably connected to the support plate, a sliding tube slidably connected to one end of each pull rod, and a spring sleeved on the pull rod, with both ends of the spring fixed to the end of the pull rod and the end of the sliding tube near the pull rod, respectively; a vibrating motor is installed at the bottom of the screening plate, and an installation groove is provided on the screening plate, in which a screening screen is installed.

[0021] According to the present invention, a high-efficiency separation device for rubber particles and steel wires after waste tire crushing is provided. The variable diameter component includes an insert block. A slot is provided on the side wall of the throat portion of the venturi tube. The slot is arranged perpendicular to the axis of the throat tube. The insert block is inserted into the slot. The cross-sectional shape of the insert block is an isosceles trapezoidal structure. A rubber inner tube is provided on the inner wall of the throat tube. An arc-shaped extrusion block is fixedly connected to one end of the insert block. The arc-shaped extrusion block is fixed to the outer wall of the rubber inner tube. A control ring is slidably connected to the throat tube. An annular groove is provided on one side of the control ring. The cross-sectional shape of the annular groove is a triangular structure. The inclined surface of the annular groove is slidably connected to the inclined surface of the insert block. An extrusion nut is threadedly connected to the throat tube. The extrusion nut is rotatably connected to the control ring.

[0022] The present invention discloses the following technical effects:

[0023] 1) The multi-stage crushing method can more thoroughly crush waste tires into a mixture of fine rubber particles and steel wires, increasing the contact area between the steel wires and rubber particles in the subsequent separation process, which is conducive to improving the separation efficiency.

[0024] 2) The application of Venturi tubes and their reducing components optimizes the mixing process, reduces blockages and residues during the process, ensures that the mixture can be stably and efficiently transported to the separation device, and improves the overall system operating efficiency.

[0025] 3) The combined effect of permanent magnets and electromagnetic fields makes the adsorption force on the steel wire stronger and more stable, which can more effectively separate the steel wire from the rubber particles and greatly improve the separation efficiency.

[0026] 4) The screening component can further screen the separated rubber particles to remove any small amount of steel wire or other impurities that may remain, resulting in a purer rubber particle product and improving product quality.

[0027] 5) By rationally designing parameters such as the magnetic field strength and rotation speed of the composite drum, as well as the screen aperture size of the screening components, the particle size and purity of rubber particles can be precisely controlled to meet the needs of different users.

[0028] 6) The design of the transmission components enables the multi-stage crushing components, conveying components and composite rollers to work together, reducing energy loss during the energy transfer process and lowering the system's energy consumption.

[0029] 7) Integrating crushing, conveying, separating, and screening functions into one device reduces the equipment's footprint and lowers equipment procurement and installation costs. At the same time, the integrated design facilitates equipment maintenance and management, reducing operating costs.

[0030] 8) This device can adapt to waste tires of different specifications and materials by adjusting the crushing parameters of the multi-stage crushing components and the magnetic field strength of the composite drum, and has strong material adaptability.

[0031] 9) The reasonable layout and transmission coordination between the components, as well as the structural strength design of the equipment, ensure the stability and reliability of the equipment during long-term operation, reduce the occurrence of equipment failures, and improve the service life of the equipment.

[0032] 10) This device can efficiently separate rubber particles and steel wires from waste tires, realizing resource recycling, reducing dependence on natural resources, and reducing energy consumption.

[0033] 11) If waste tires are discarded or improperly disposed of, they will cause serious environmental pollution. This device recycles and processes waste tires, avoiding pollution of soil, water sources and air, and has good environmental benefits. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of the efficient separation device for rubber particles and steel wires after waste tire crushing according to this utility model;

[0036] Figure 2 This is a schematic diagram of the crushing mechanism of this utility model;

[0037] Figure 3 This is a schematic diagram of the composite drum separation assembly of this utility model;

[0038] Figure 4 This is a schematic diagram of the structure of the venturi tube of this utility model.

[0039] The components are as follows: 1. First support; 2. Crushing box; 3. Feed inlet; 4. Discharge outlet; 5. Venturi tube; 6. Second support; 7. Sorting trough; 8. Permanent magnet and electromagnetic composite drum; 9. Conveyor box; 10. First motor; 11. Chain; 12. Second motor; 13. Mounting shaft; 14. Screening plate; 15. Support plate; 16. Tie rod; 17. Sliding tube; 18. Spring; 19. Screening mesh; 20. Insert block; 21. Rubber inner tube; 22. Arc-shaped extrusion block; 23. Control ring. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Reference Figure 1-4 This utility model provides a device for efficiently separating rubber particles and steel wires after waste tires are crushed, comprising:

[0043] The crushing mechanism includes a first support 1, a crushing box 2 is installed on the top of the first support 1, a feed inlet 3 is opened on the top of the crushing box 2, a discharge outlet 4 is opened on the bottom of the crushing box 2, and a multi-stage crushing component is installed inside the crushing box 2.

[0044] The conveying assembly is mounted on the first support 1 and is located below the crushing box 2. The feed end of the conveying assembly corresponds to the discharge port 4. The feed end and the discharge port 4 are connected by a venturi tube 5, and the throat part of the venturi tube 5 is provided with a diameter reducing component.

[0045] The transmission component is mounted on the first support 1, and the multi-stage crushing component and the conveying component are all driven by the transmission component.

[0046] The composite drum separation assembly includes a second support 6, which is installed on one side of the first support 1. A sorting trough 7 is installed at the top of the second support 6. A permanent magnet and electromagnetic composite drum 8 is rotatably connected inside the sorting trough 7. A drive assembly is installed on the second support 6. The drive assembly is in transmission cooperation with the permanent magnet and electromagnetic composite drum 8. A through groove is opened at the bottom of the sorting trough 7. The output end of the conveying assembly is arranged corresponding to the feed end of the permanent magnet and electromagnetic composite drum 8.

[0047] The screening component is installed at the bottom of the sorting trough 7 and is arranged correspondingly to the through trough.

[0048] In operation, waste tires are first fed into the crushing chamber 2 through the inlet 3 at the top. The transmission assembly is activated, driving the multi-stage crushing assembly to crush the waste tires into a mixture of rubber particles and steel wire. The crushed mixture is discharged from the outlet 4 at the bottom of the crushing chamber 2. The crushed mixture is then conveyed from the outlet 4 of the crushing chamber 2 to the inlet end of the conveying assembly via a Venturi tube 5. The variable diameter assembly in the throat of the Venturi tube 5 can utilize the Venturi effect to generate a certain negative pressure or pressure change, which helps to smoothly convey the mixture, prevents blockage, and improves conveying efficiency. The transmission assembly drives the conveying assembly to transport the mixture from the inlet end to the outlet end. The outlet end of the conveying assembly transports the mixture to the inlet end of the permanent magnet and electromagnetic composite drum 8. The drive assembly is activated, driving the permanent magnet and electromagnetic composite drum 8 to rotate. During the rotation of the composite drum, the rubber particles and steel wire in the mixture are separated using the combined action of permanent magnets and electromagnetic fields. Because of their magnetic properties, the steel wires are attracted to the surface of the composite drum, while the rubber granules, unaffected by magnetism, detach from the drum. The material separated by the composite drum falls through a trough at the bottom of the sorting tank 7 and enters the screening assembly. The screening assembly further separates the material, picking out rubber granules that meet the particle size requirements to obtain a pure rubber granule product, while any remaining steel wires or other impurities are removed.

[0049] Further optimization of the scheme: the multi-stage crushing component includes a multi-stage crushing roller group, which is arranged sequentially along the feeding direction. Each crushing roller group includes two symmetrically arranged crushing rollers. The crushing rollers are rotatably connected to the crushing box 2 through a rotating shaft, with one end of the rotating shaft passing through the crushing box 2 and extending out.

[0050] Further optimization of the scheme: the conveying component includes a conveying box 9 fixedly connected to the first support 1, an auger rotatably connected inside the conveying box 9, one end of the auger passing through the side wall of the conveying box 9, the top of the conveying box 9 corresponding to the discharge port 4, and the discharge end of the conveying box 9 connected to the feed end of the permanent magnet and electromagnetic composite roller 8.

[0051] The scheme is further optimized. The transmission component includes a first motor 10 fixedly connected to the first bracket 1. The output end of the first motor 10 is fixedly connected to a drive sprocket. Driven sprockets are installed at the end of the auger and the end of the shaft, respectively. The drive sprocket and the driven sprocket are respectively connected by a chain 11.

[0052] The scheme is further optimized. The drive component includes a second motor 12 fixedly connected to the second bracket 6. The output shaft of the second motor 12 is fixedly connected to the first pulley. A boom is fixed inside the permanent magnet and electromagnetic composite roller 8. A mounting shaft 13 is fixedly connected to the boom. One end of the mounting shaft 13 is fixedly connected to the second pulley. The first pulley and the second pulley are connected by belt drive.

[0053] Further optimizing the scheme, the screening assembly includes a screening plate 14 rotatably connected to the bottom of the sorting tank 7. The screening plate 14 has a tapered structure at its end, and a support plate 15 is fixedly connected to the top of the screening plate 14. Two sets of pull rods 16 are symmetrically rotatably connected to the support plate 15. One end of each pull rod 16 is slidably connected to a slide tube 17, and the other end of the slide tube 17 is rotatably connected to the side of the sorting tank 7. A spring 18 is fitted onto each pull rod 16, with both ends of the spring 18 fixed to the ends of the pull rod 16 and the end of the slide tube 17 near the pull rod 16, respectively. A vibrating motor is installed at the bottom of the screening plate 14, and an installation groove is provided on the screening plate 14. A screening mesh 19 is installed in the installation groove. The mesh aperture is 1mm.

[0054] Further optimization of the scheme: the variable diameter assembly includes a plug 20. A slot is provided on the side wall of the throat section of the venturi tube 5. The slot is arranged perpendicular to the axis of the throat tube. The plug 20 is inserted into the slot. The cross-sectional shape of the plug 20 is an isosceles trapezoidal structure. A rubber inner tube 21 is provided on the inner wall of the throat tube. An arc-shaped extrusion block 22 is fixedly connected to one end of the plug 20. The arc-shaped extrusion block 22 is fixed to the outer wall of the rubber inner tube 21. A control ring 23 is slidably connected to the throat tube. An annular groove is provided on one side of the control ring 23. The cross-sectional shape of the annular groove is a triangular structure. The inclined surface of the annular groove is slidably connected to the inclined surface of the plug 20. A compression nut is threaded on the throat tube. The compression nut is rotatably connected to the control ring 23.

[0055] When it is necessary to adjust the flow area of ​​the throat section of the Venturi tube 5, rotate the compression nut. Since the compression nut is threadedly connected to the throat and rotatably connected to the control ring 23, the compression nut will move along the axis of the throat during rotation.

[0056] As the compression nut moves, it pushes the control ring 23 to slide along the axis of the throat. Because the annular groove (with a triangular cross-section) on the control ring 23 is slidably connected to the inclined surface of the insert 20, the sliding of the control ring 23 will compress the inclined surface of the insert 20.

[0057] Under the squeezing action of the control ring 23, the insert 20 will move along the slot towards the center of the throat. Since the arc-shaped squeezing block 22 at one end of the insert 20 is fixedly connected to the outer wall of the rubber inner tube 21, the movement of the insert 20 will cause the arc-shaped squeezing block 22 to squeeze the rubber inner tube 21, causing the rubber inner tube 21 to deform.

[0058] As the inner rubber tube 21 deforms, the flow area of ​​the throat section of the Venturi tube 5 gradually decreases. By controlling the rotation of the compression nut, the movement distance of the control ring 23 can be precisely controlled, thereby precisely controlling the movement distance of the insert block 20 and the degree of deformation of the inner rubber tube 21, thus achieving precise adjustment of the flow area of ​​the throat section of the Venturi tube 5.

[0059] When it is necessary to restore the flow area of ​​the throat section of the Venturi tube 5, rotate the compression nut in the reverse direction. The compression nut will move in the reverse direction along the axis of the throat, causing the control ring 23 to slide in the reverse direction.

[0060] As the control ring 23 slides in the opposite direction, the squeezing effect on the inclined surface of the insert block 20 gradually decreases. Under the action of the elastic restoring force of the rubber inner tube 21, the insert block 20 moves along the slot towards the direction away from the center of the throat. The squeezing effect of the arc-shaped squeezing block 22 on the rubber inner tube 21 gradually decreases, and the rubber inner tube 21 gradually returns to its original shape.

[0061] As the inner rubber tube 21 is restored, the flow area of ​​the throat section of the Venturi tube 5 gradually increases until it returns to its initial state.

[0062] This variable diameter assembly, through the coordinated operation of the insert block 20, the rubber inner tube 21, the control ring 23, and the compression nut, adjusts the flow area of ​​the throat section of the Venturi tube 5. This adjustment method has advantages such as simple operation, high adjustment accuracy, and fast response speed. It can flexibly adjust the conveying performance of the Venturi tube 5 according to actual working needs, improving the overall working efficiency and adaptability of the high-efficiency separation device for rubber particles and steel wires after waste tire shredding. For example, under different material conveying volumes or conveying pressures, adjusting the flow area of ​​the Venturi tube 5 can ensure stable conveying of the mixture, reduce blockage and residue, and improve the separation effect.

[0063] The diameter of the trachea is 10 mm.

[0064] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0065] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A highly efficient device for separating rubber particles and steel wires after waste tire pulverization, characterized in that, include: The crushing mechanism includes a first support (1), a crushing box (2) is installed on the top of the first support (1), a feed inlet (3) is opened on the top of the crushing box (2), a discharge outlet (4) is opened on the bottom of the crushing box (2), and a multi-stage crushing component is installed inside the crushing box (2). The conveying assembly is mounted on the first bracket (1) and is located below the crushing box (2). The inlet end of the conveying assembly corresponds to the outlet (4). The inlet end and the outlet (4) are connected by a venturi tube (5). The throat part of the venturi tube (5) is provided with a variable diameter assembly. A transmission assembly is mounted on the first bracket (1), and the multi-stage crushing assembly and the conveying assembly are both in transmission cooperation with the transmission assembly; A composite roller separation assembly includes a second support (6), which is installed on one side of the first support (1). A sorting groove (7) is installed at the top of the second support (6). A permanent magnet and electromagnetic composite roller (8) is rotatably connected in the sorting groove (7). A drive assembly is installed on the second support (6). The drive assembly is in transmission cooperation with the permanent magnet and electromagnetic composite roller (8). A through groove is opened at the bottom of the sorting groove (7). The output end of the conveying assembly is arranged corresponding to the feed end of the permanent magnet and electromagnetic composite roller (8). A screening component is installed at the bottom of the sorting trough (7) and is arranged corresponding to the through trough.

2. The efficient separation device for rubber particles and steel wires after waste tire crushing according to claim 1, characterized in that: The multi-stage crushing assembly includes a multi-stage crushing roller group, which is arranged sequentially along the feeding direction. Each crushing roller group includes two symmetrically arranged crushing rollers. The crushing rollers are rotatably connected to the crushing box (2) through a rotating shaft. One end of the rotating shaft passes through the crushing box (2) and extends out.

3. The efficient separation device for rubber particles and steel wires after waste tire crushing according to claim 2, characterized in that: The conveying assembly includes a conveying box (9) fixedly connected to the first support (1). An auger is rotatably connected inside the conveying box (9). One end of the auger passes through the side wall of the conveying box (9). The top of the conveying box (9) is arranged corresponding to the discharge port (4). The discharge end of the conveying box (9) is connected to the feed end of the permanent magnet and electromagnetic composite roller (8).

4. The efficient separation device for rubber particles and steel wires after waste tire crushing according to claim 3, characterized in that: The transmission assembly includes a first motor (10) fixedly connected to the first bracket (1), a drive sprocket fixedly connected to the output end of the first motor (10), a driven sprocket installed at the end of the auger and the end of the shaft respectively, and the drive sprocket and the driven sprocket are respectively connected by a chain (11).

5. The efficient separation device for rubber particles and steel wires after waste tire crushing according to claim 1, characterized in that: The drive assembly includes a second motor (12) fixedly connected to the second bracket (6), the output shaft of the second motor (12) is fixedly connected to a first pulley, a boom is fixed inside the permanent magnet and electromagnetic composite roller (8), an mounting shaft (13) is fixedly connected to the boom, and a second pulley is fixedly connected to one end of the mounting shaft (13), and the first pulley and the second pulley are connected by belt drive.

6. The efficient separation device for rubber particles and steel wires after waste tire crushing according to claim 1, characterized in that: The screening assembly includes a screening plate (14) rotatably connected to the bottom of the sorting trough (7). The end of the screening plate (14) is provided with a tapered structure. The top of the screening plate (14) is fixedly connected to a support plate (15). Two sets of pull rods (16) are symmetrically rotatably connected to the support plate (15). One end of the pull rod (16) is slidably connected to a slide tube (17). One end of the slide tube (17) is rotatably connected to the side of the sorting trough (7). A spring (18) is sleeved on the pull rod (16). The two ends of the spring (18) are respectively fixed to the end of the pull rod (16) and the end of the slide tube (17) near the pull rod (16). A vibration motor is installed at the bottom of the screening plate (14). An installation groove is opened on the screening plate (14). A screening screen (19) is installed in the installation groove.

7. The efficient separation device for rubber particles and steel wires after waste tire crushing according to claim 1, characterized in that: The variable diameter assembly includes a plug (20). A slot is provided on the side wall of the throat portion of the venturi tube (5). The slot is arranged perpendicular to the axis of the throat tube. The plug (20) is inserted into the slot. The cross-sectional shape of the plug (20) is an isosceles trapezoidal structure. A rubber inner tube (21) is provided on the inner wall of the throat tube. An arc-shaped extrusion block (22) is fixedly connected to one end of the plug (20). The arc-shaped extrusion block (22) is fixed to the outer wall of the rubber inner tube (21). A control ring (23) is slidably connected to the throat tube. An annular groove is provided on one side of the control ring (23). The cross-sectional shape of the annular groove is a triangular structure. The inclined surface of the annular groove is slidably connected to the inclined surface of the plug (20). A compression nut is threadedly connected to the throat tube. The compression nut is rotatably connected to the control ring (23).

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