A fixing device for removing rust from outer wall of pipeline

Abstract

The present invention discloses a fixing device for removing rust from the outer wall of a pipeline in the field of pipeline maintenance, including a fixing device for removing rust from the outer wall of a pipeline, including a storage component, including a storage shell, a knob is inserted into one end of the storage shell, and an unlocking groove is provided at the other end of the storage shell, and a pressing piece is provided in the unlocking groove; a support component, including a fixed ring and a movable ring arranged in the storage shell, and the fixed ring and the movable ring are stacked; a clamping component, including an adjusting piece arranged on the fixed ring and the movable ring, and the adjusting piece is movably connected with a friction piece. The present invention can quickly sleeve the device on the outer wall of the pipeline through the support component, which greatly saves installation time, and can also achieve the effect of easy disassembly and storage, and can synchronously adjust all friction pieces, without removing the pipeline, and the rust removal of the outer wall of the pipeline can be completed by installing a rotating device outside the device, which greatly improves the efficiency of rust removal.

Description

Technical Field

[0001] The invention relates to the field of pipeline maintenance, in particular to a fixing device for removing rust from the outer wall of a pipeline. Background Art

[0002] When metal pipes are placed in an open-air environment for a long time, rust is easy to form on the outer wall of the pipe. The rust layer not only affects the appearance of the pipe, but the sponge-like rust will absorb more moisture, accelerate the corrosion process of the pipe, and reduce the strength and safety of the pipe. Therefore, the rust on the outer wall needs to be removed before use. Rust removal of the outer wall of the pipe is an important part of maintaining the integrity of the pipeline facilities and extending its service life.

[0003] Traditional rust removal methods include chemical rust removal and spray rust removal. Chemical rust removal uses strong acid to react with rust and metal oxides to generate soluble salts to achieve the purpose of rust removal. This method may cause hydrogen embrittlement, affect the mechanical properties of the metal, and have a corrosive effect on the environment and equipment. It is generally not used. Spray rust removal uses sprayed abrasive particles to impact the metal surface to remove rust, which also pollutes the environment. Traditional rust removal methods have greater disadvantages.

[0004] However, the general pipeline rust removal device has a complex overall structure, a large size, occupies a large area, and is not easy to carry and adjust. Therefore, the pipeline to be rusted can only be disassembled and fixed on the rust removal device, which not only increases the labor cost, but also increases the steps of disassembling and assembling the pipeline, and the time cost increases accordingly, which greatly delays the progress of rust removal. Summary of the invention

[0005] In view of the fact that the overall structure of the pipeline rust removal device in the above-mentioned prior art is relatively complex, occupies a large area, and the rust removal process requires additional steps of disassembling and assembling the pipeline, which leads to increased labor and time costs and delays the progress of rust removal, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is how to achieve rapid installation of the rust removal device and improve the efficiency of pipeline rust removal.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a fixing device for removing rust from the outer wall of a pipeline, comprising: a storage component, comprising a storage shell, a knob is inserted into one end of the storage shell, and an unlocking groove is opened at the other end of the storage shell, and a pressing piece is provided in the unlocking groove; a supporting component, comprising a fixed ring and a movable ring arranged in the storage shell, and the fixed ring and the movable ring are stacked; a clamping component, comprising an adjusting piece arranged on the fixed ring and the movable ring, and the adjusting piece is movably connected to the friction piece.

[0008] As a preferred solution of the fixing device for removing rust from the outer wall of the pipe described in the present invention, a baffle is provided at the edge of the storage shell, a track groove is provided on the side wall of the storage shell, a straight groove is provided at the end of the track groove, a fixing column is provided in the storage shell, the fixing column is close to the unlocking groove, and the unlocking groove is connected to the slot.

[0009] As a preferred solution of the fixing device for removing rust from the outer wall of a pipe described in the present invention, the outer side of the knob is ringed with vertical lines, an extension rod is fixed on the knob, positioning grooves are symmetrically provided at the bottom of the extension rod, and active teeth are fixed on the extension rod.

[0010] As a preferred solution of the fixing device for rust removal of the outer wall of the pipeline described in the present invention, the pressing member includes an upper plate, a lower plate and a connecting plate connecting the upper plate and the lower plate, the upper plate is provided with a pressing block, the pressing block extends out of the unlocking groove, the lower plate is provided with an inclined block, the inclined block is inserted into the slot, and springs are provided at the bottom of the upper plate and the lower plate.

[0011] As a preferred solution of the fixing device for removing rust from the outer wall of the pipeline described in the present invention, wherein: an arc-shaped limit groove is provided on the surface of the fixing ring, a chain is provided in the arc-shaped limit groove, a fixing hole is provided at one end of the fixing ring, a first recess is provided at the other end of the fixing ring, a locking hole is provided in the first recess, and a locking spring is provided in the locking hole.

[0012] As a preferred solution of the fixing device for rust removal of the outer wall of the pipeline described in the present invention, the movable ring surface is also provided with an arc-shaped limit groove, a chain is provided in the arc-shaped limit groove, a locking block is provided at one end of the movable ring, a groove is provided on the locking block, a second concave platform is provided at the other end of the movable ring, a driven tooth is inserted into the second concave platform, a sleeve is provided at the bottom of the driven tooth, a clamping column is symmetrically provided on the inner wall of the sleeve, and a sliding block is provided on the outer wall of the movable ring.

[0013] As a preferred solution of the fixing device for removing rust from the outer wall of the pipeline described in the present invention, a synchronization ring is provided in the locking hole, a locking groove is symmetrically opened on the inner wall of the synchronization ring, a latch is embedded in the locking groove, and an unlocking spring is provided at the bottom of the latch.

[0014] As a preferred solution of the fixing device for removing rust from the outer wall of the pipeline described in the present invention, wherein: the fixing ring and the movable ring are vertically provided with adjustment holes, and a horizontally arranged movable groove is provided near the adjustment hole, and the angle between the two adjustment holes is 120 degrees.

[0015] As a preferred solution of the fixing device for removing rust from the outer wall of a pipeline of the present invention, the adjusting member comprises a sprocket at the top and a gear at the bottom, and the gear is placed in the adjusting hole.

[0016] As a preferred solution of the fixing device for removing rust from the outer wall of the pipeline described in the present invention, the friction member includes a rack and a rust removal plate fixedly connected to the rack, the friction member is inserted into the movable groove, and an adjustment spring is provided between the rust removal plate and the rack.

[0017] The beneficial effects of the present invention are as follows: the device can be quickly sleeved on the outer wall of the pipeline through the support assembly, which greatly saves installation time and can also achieve the effect of easy disassembly and storage, and can synchronously adjust all friction parts without removing the pipeline. The rust removal of the outer wall of the pipeline can be completed by installing a rotating device outside the device, which greatly improves the efficiency of rust removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0019] Figure 1 A schematic structural diagram of a fixing device for removing rust from the outer wall of a pipeline provided by the present invention;

[0020] Figure 2 A schematic diagram of the structure of a receiving assembly of a fixing device for removing rust from the outer wall of a pipeline provided by the present invention;

[0021] Figure 3 A schematic diagram of the structure of an unlocking groove of a fixing device for removing rust from the outer wall of a pipeline provided by the present invention;

[0022] Figure 4 A schematic diagram of the structure of a fixing ring of a fixing device for removing rust from the outer wall of a pipeline provided by the present invention;

[0023] Figure 5 A schematic diagram of the structure of a movable ring of a fixing device for removing rust from the outer wall of a pipeline provided by the present invention;

[0024] Figure 6 A schematic diagram of the structure of a clamping assembly of a fixing device for removing rust from the outer wall of a pipeline provided by the present invention;

[0025] Figure 7 A schematic diagram of the structure of a fixing device for removing rust from the outer wall of a pipeline provided by the present invention in a stored state;

[0026] Figure 8 A schematic diagram of the cross-sectional structure of a fixing device A for removing rust from the outer wall of a pipeline provided by the present invention;

[0027] Fig. 9A schematic structural diagram of a fixing device for removing rust from the outer wall of a pipeline provided by the present invention in an unfolded state;

[0028] Fig.10 A schematic diagram of the cross-sectional structure of a fixing device B for removing rust from the outer wall of a pipeline provided by the present invention;

[0029] Fig.11 The present invention is a schematic cross-sectional structural diagram of a fixing device for removing rust from the outer wall of a pipeline in an unfolded state.

[0030] In the figure: storage component, 100; storage shell, 101; knob, 102; pressing member, 103; supporting component, 200; fixing ring, 201; movable ring, 202; clamping component, 300; adjusting member, 301; friction member, 302; unlocking groove, 101a; blocking bar, 101b; track groove, 101c; straight groove, 101c-1; fixing column, 101d; slot, 101e; vertical stripes, 102a; extension rod, 102b; positioning groove, 102b-1; active tooth, 102c; upper plate, 103a; lower plate, 103b; connecting plate, 103c; pressing block, 103a-1; inclined block, 103b-1; spring , 103d; arc-shaped limit groove, 201a; chain, 201b; fixing hole, 201c; first concave platform, 201d; locking hole, 201e; locking spring, 201e-1; locking block, 202a; groove, 202a-1; second concave platform, 202b; driven tooth, 202c; sleeve, 202c-1; clamping column, 202c-2; slider, 202d; synchronous ring, 203; locking groove, 203a; latch, 203b; unlocking spring, 203c; adjusting hole, 204; moving groove, 205; chain tooth, 301a; gear, 301b; rack, 302a; rust removal plate, 302b; adjusting spring, 302c; DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] Example 1, reference Figure 1 to Figure 9 The present embodiment provides a fixing device for removing rust from the outer wall of a pipeline, including a storage component 100, including a storage shell 101, a knob 102 is inserted into one end of the storage shell 101, and an unlocking groove 101a is opened at the other end of the storage shell 101, and a pressing member 103 is arranged in the unlocking groove 101a; a support component 200, including a fixed ring 201 and a movable ring 202 arranged in the storage shell 101, and the fixed ring 201 and the movable ring 202 are stacked; a clamping component 300, including an adjusting member 301 arranged on the fixed ring 201 and the movable ring 202, and the adjusting member 301 is movably connected with the friction member 302.

[0033] Specifically, the storage shell 101 can accommodate all components in the device. The storage shell 101 is slightly larger than the fixed ring 201 and twice as thick as the fixed ring 201. Therefore, the fixed ring 201 and the movable ring 202 can be placed in the storage shell 101 at the same time, which can ensure the fixation of the fixed ring 201 and allow the movable ring 202 to move freely in the storage shell 101.

[0034] Preferably, the device is first placed outside the pipe to be derusted, and then the movable ring 202 is completely extended out of the storage shell 101 and connected to the fixed ring 201. The circular ring formed by the movable ring 202 and the fixed ring 201 is sleeved on the periphery of the pipe, and three groups of friction members 302 are arranged equidistantly on the inner wall of the circular ring, and the angle between two adjacent groups of friction members 302 is 120 degrees. Finally, the position of the friction members 302 is changed by the adjusting member 301, so that the friction members 302 are close to the outer wall of the pipe to complete the fixing of the device. Since the outer diameter of the device is fixed, it is only necessary to install a rotating mechanism outside the device according to the outer diameter. The rotating mechanism only needs to realize the rotation of the circle around the pipe, and the circular ring can be used to grind and derust the pipe through the friction member 302.

[0035] Furthermore, by adjusting the position of the friction member 302 by the adjusting member 301, not only can the device be fixed, but the device can also be fixed on pipes of different diameters, further improving the applicability of the device.

[0036] By setting up this device, the volume is small when not in use, which is convenient for storage and carrying. When needed, it can be quickly installed on the pipe and can also clamp pipes of different diameters, thus taking into account the applicability of the device.

[0037] Example 2, reference Figure 2~Figure 3, which is the second embodiment of the present invention, is based on the previous embodiment, and is different from the previous embodiment in that: a stop bar 101b is provided at the edge of the storage shell 101, a track groove 101c is provided on the side wall of the storage shell 101, a straight groove 101c-1 is provided at the end of the track groove 101c, a fixing column 101d is provided in the storage shell 101, the fixing column 101d is close to the unlocking groove 101a, and the unlocking groove 101a is connected to the slot 101e; the outer ring of the knob 102 is provided with vertical lines 102a, and an extension rod 102b is fixed on the knob 102, and the extension rod 102b is provided on the knob 102. 02b has symmetrical positioning grooves 102b-1 at the bottom, and an active tooth 102c is fixed on the extension rod 102b; the pressing piece 103 includes an upper plate 103a, a lower plate 103b and a connecting plate 103c connecting the upper plate 103a and the lower plate 103b, a pressing block 103a-1 is provided on the upper plate 103a, and the pressing block 103a-1 extends out of the unlocking groove 101a, and an inclined block 103b-1 is provided on the lower plate 103b, and the inclined block 103b-1 is inserted into the slot 101e, and springs 103d are provided at the bottom of the upper plate 103a and the lower plate 103b.

[0038] Specifically, the inward baffles 101b on both sides of the storage shell 101 are used to prevent the movable ring 202 from falling off the storage shell 101, and the track groove 101c can plan the movement path of the movable ring 202. Through the cooperation of the baffles 101b and the track groove 101c, the movement range of the movable ring 202 can be limited, ensuring that the movable ring 202 can move along the correct path and ensure the normal operation of the device.

[0039] Preferably, the pressing piece 103 can be completely embedded in the unlocking groove 101a, and all parts of the pressing piece 103 are in contact with the inner wall of the unlocking groove 101a. The inclined block 103b-1 extends out through the channel connecting the unlocking groove 101a and the slot 101e. By pressing the pressing block 103a-1, the upper plate 103a can be driven to move downward. Because the pressing piece 103 is made of hard material and the deformation caused by the force is small, the downward movement of the upper plate 103a can synchronously drive the movement of the lower plate 103b, and the inclined block 103b-1 is pressed back into the unlocking groove 101a. After releasing the pressing block 103a-1, the inclined block 103b-1 pops out again under the action of the restoring force of the spring 103d.

[0040] Furthermore, both ends of the fixing ring 201 are fixed by the fixing column 101d and the knob 102 respectively, and are restricted by the blocking bar 101b to prevent it from falling from the side.

[0041] By providing the storage assembly 100 , in addition to achieving the basic portability and storage functions, it can also fix the fixed ring 201 and the movable ring 202 , further improving the stability of the device.

[0042] Example 3, reference Figure 4~Figure 11, which is the third embodiment of the present invention, and provides a fixing device for removing rust from the outer wall of a pipeline. This embodiment is based on the previous embodiment, and is different from the previous embodiment in that: an arc-shaped limiting groove 201a is provided on the surface of the fixing ring 201, a chain 201b is provided in the arc-shaped limiting groove 201a, a fixing hole 201c is provided at one end of the fixing ring 201, and a first concave platform 201d is provided at the other end of the fixing ring 201, and a locking hole 201e is provided in the first concave platform 201d, A locking spring 201e-1 is provided in the locking hole 201e; an arc-shaped limiting groove 201a is also provided on the surface of the movable ring 202, and a chain 201b is provided in the arc-shaped limiting groove 201a. A locking block 202a is provided at one end of the movable ring 202, and a groove 202a-1 is provided on the locking block 202a. A second concave platform 202b is provided at the other end of the movable ring 202, and a driven tooth 202c is inserted into the second concave platform 202b. A sleeve 202c-1 is provided at the bottom of the driven tooth 202c. 1, the inner wall of the sleeve 202c-1 is symmetrically provided with a clamping column 202c-2, and the outer wall of the movable ring 202 is provided with a slider 202d; a synchronous ring 203 is provided in the locking hole 201e, and a locking groove 203a is symmetrically opened on the inner wall of the synchronous ring 203, and a latch 203b is embedded in the locking groove 203a, and an unlocking spring 203c is provided at the bottom of the latch 203b; an adjustment hole 204 is vertically opened on the fixed ring 201 and the movable ring 202, and a horizontal spring 203c is opened near the adjustment hole 204. The movable groove 205 is arranged in the direction of rotation, and the angle between the two adjustment holes 204 is 120 degrees; the adjusting member 301 includes a sprocket 301a at the top and a gear 301b at the bottom, and the gear 301b is placed in the adjusting hole 201f; the friction member 302 includes a rack 302a and a rust removal plate 302b fixedly connected to the rack 302a, the friction member 302 is inserted into the movable groove 205, and an adjustment spring 302c is provided between the rust removal plate 302b and the rack 302a.

[0043] Specifically, the slider 202d is embedded in the track groove 101c to limit the movement range of the movable ring 202. When the slider 202d moves to the end of the track groove 101c and enters the straight groove 101c-1, the first recess 201d on the fixed ring 201 is connected to the second recess 201d on the movable ring 202. At the same time, the locking block 202a on the movable ring 202 is inserted into the unlocking groove 101a. The fixing of the fixed ring 201 is completed through the cooperation of the inclined block 103b-1 and the groove 202a-1.

[0044] Preferably, the vertical lines 102a on the knob 102 can increase the friction force, save effort when adjusting the knob 102, and prevent slipping during manual adjustment. When the fixed ring 201 is not connected to the movable ring 202, the active tooth 102c on the knob 102 is meshed with the chain 201b, and a portion of the positioning groove 102b-1 provided on the extension rod 102b completely extends out of the locking hole 201e. When the fixed ring 201 and the movable ring 202 are connected, the extension rod 102b of the knob 102 passes through the two rings at the same time and is inserted into the sleeve 202c-1, and the clamping column 202c-2 on the inner wall of the sleeve 202c-1 is inserted into the positioning groove 102b-1. At this time, the driven tooth 202c can be driven to move synchronously by rotating the knob 102.

[0045] Furthermore, both the fixed ring 201 and the movable ring 202 are provided with a chain 201b arranged along the edge thereof. When the knob 102 is connected to the fixed ring 201, the active tooth 102c is placed on the surface of the fixed ring 201 and meshes with the chain 201b. The chain tooth 301a of the adjusting member 301 is also located on the surface of the fixed ring 201 and meshes with the chain 201b. Therefore, when the knob 102 is rotated, the rotation of the active tooth 102c will drive the chain 201b to move along the arc-shaped limiting groove 201a, and the movement of the chain 201b will drive the meshing chain tooth 301a to rotate. At the same time, when the adjusting member 301 rotates, it will also drive the driven tooth 202c to rotate synchronously. The driven tooth 202c is also engaged with the chain 201b on the movable ring 202. Therefore, the rotation of the driven tooth 202c will drive the chain on the movable ring 202 to move synchronously, thereby causing the chain tooth 301a on the movable ring 202 to rotate. Since the driving tooth 102c and the driven tooth 202c have the same shape and rotation speed, and the chains 201b of the two rings are also the same, it can ultimately ensure that the rotation speed and direction of the adjusting member 301 on the fixed ring 201 and the movable ring 202 are consistent.

[0046] Specifically, when the chain tooth 301a rotates, the gear 301b at the other end of the adjusting member 301 is driven to rotate. Because the gear 301b is meshed with the rack 302a of the friction member 302, the rotation of the gear 301b causes the friction member 302 to move along the movable groove 205. In particular, the movable groove 205 is oriented toward the center of the circular ring formed by the fixed ring 201 and the movable ring 202. Therefore, the three groups of friction members 302 also point to the center of the circular ring. When the pipe in the circular ring is clamped by the friction members 302, it can ensure that the pressure applied by each group of friction members 302 acts vertically on the outer wall of the pipe. By fixing the pipe at three points, not only can the pipe be positioned so that the axis of the pipe is collinear with the axis of the circular ring, but also the force on the contact surface of the pipe can be consistent, thereby avoiding damage to the pipe or the device itself.

[0047] Preferably, in order to ensure that each group of adjusting members 301 always maintains synchronous movement, it is necessary to ensure that the knob 102 cannot rotate when the fixed ring 201 is not connected to the movable ring 202. When the fixed ring 201 is not connected to the movable ring 202, the synchronizer ring 203 extends out of the locking hole 201e, and the latch 203b in the synchronizer ring 203 extends out and is embedded in the positioning groove 102b-1. The knob 102 is fixed by the symmetrically arranged latches 203b to prevent the asynchronous movement of the adjusting member 301 caused by the rotation of the knob 102 in the unconnected state; when the fixed ring 201 is connected to the movable ring 202, the second concave platform 202b of the movable ring 202 presses the synchronizer ring 203 back into the locking hole 201e, and the latch 203b is pressed back into the locking groove 203a through the arc structure at the end of the positioning groove 102b-1, completing the unlocking of the knob 102.

[0048] When the rust removal is completed, the device needs to be stored again. First, the knob 102 is turned in the opposite direction. The reverse rotation of the knob 102 drives the driving wheel 102c to rotate, and the adjusting member 301 is driven to reverse through the meshing chain 201b, thereby causing the friction member 302 to move in the direction away from the center of the circular ring until the rack 302a of the friction member 302 is completely retracted into the movable groove 205, and then the pressing block 103a-1 is pressed down. While the pressing block 103a-1 moves downward, it drives the inclined block 103b-1 to retract into the unlocking groove 101a. The locking block 202a of the movable ring 202 is unlocked after losing the restriction of the inclined block 103b-1. At this time, the connection between the fixed ring 201 and the movable ring 202 is disconnected. Under the action of the locking spring 201e-1, the synchronous ring 203 pops out to re-fix the knob 102. Finally, the slider 202d moves along the track groove 102c to retract the movable ring 202 into the storage shell 101.

[0049] Through the cooperation between the support assembly 200 and the clamping assembly 300, the knob 102 can be turned only when the fixed ring 201 is connected to the movable ring 202, which can ensure that the adjusting parts 301 on the fixed ring 201 and the movable ring 202 always move synchronously, so that the length of each friction part 302 is always kept consistent, ensuring the reliability of clamping the pipe.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A fixing device for removing rust from the outer wall of a pipeline, characterized in that: include, The storage assembly (100) comprises a storage shell (101), one end of the storage shell (101) being inserted into a knob (102), the other end of the storage shell (101) being provided with an unlocking groove (101a), and a pressing member (103) being provided in the unlocking groove (101a); A support assembly (200) comprising a fixed ring (201) and a movable ring (202) arranged in the storage shell (101), wherein the fixed ring (201) and the movable ring (202) are stacked; The clamping assembly (300) comprises an adjusting member (301) arranged on the fixed ring (201) and the movable ring (202), wherein the adjusting member (301) is movably connected to the friction member (302); A stop bar (101b) is provided at the edge of the storage shell (101), a track groove (101c) is provided on the side wall of the storage shell (101), a straight groove (101c-1) is provided at the end of the track groove (101c), a fixing column (101d) is provided inside the storage shell (101), the fixing column (101d) is close to the unlocking groove (101a), and the unlocking groove (101a) is connected to the slot (101e); The outer ring of the knob (102) is provided with vertical lines (102a), an extension rod (102b) is fixed to the knob (102), positioning grooves (102b-1) are symmetrically provided at the bottom of the extension rod (102b), and active teeth (102c) are fixed to the extension rod (102b); The pressing member (103) comprises an upper plate (103a), a lower plate (103b) and a connecting plate (103c) connecting the upper plate (103a) and the lower plate (103b); a pressing block (103a-1) is provided on the upper plate (103a); the pressing block (103a-1) extends out of the unlocking slot (101a); an inclined block (103b-1) is provided on the lower plate (103b); the inclined block (103b-1) is inserted into the slot (101e); and springs (103d) are provided at the bottom of the upper plate (103a) and the lower plate (103b); An arc-shaped limiting groove (201a) is provided on the surface of the fixing ring (201), a chain (201b) is provided in the arc-shaped limiting groove (201a), a fixing hole (201c) is provided at one end of the fixing ring (201), a first concave platform (201d) is provided at the other end of the fixing ring (201), a locking hole (201e) is provided in the first concave platform (201d), and a locking spring (201e-1) is provided in the locking hole (201e); The surface of the movable ring (202) is also provided with an arc-shaped limiting groove (201a), a chain (201b) is provided in the arc-shaped limiting groove (201a), a locking block (202a) is provided at one end of the movable ring (202), a groove (202a-1) is provided on the locking block (202a), a second concave platform (202b) is provided at the other end of the movable ring (202), a driven tooth (202c) is inserted into the second concave platform (202b), a sleeve (202c-1) is provided at the bottom of the driven tooth (202c), a clamping column (202c-2) is symmetrically provided on the inner wall of the sleeve (202c-1), and a sliding block (202d) is provided on the outer wall of the movable ring (202); A synchronization ring (203) is provided in the locking hole (201e), a locking groove (203a) is symmetrically provided on the inner wall of the synchronization ring (203), a latch (203b) is embedded in the locking groove (203a), and an unlocking spring (203c) is provided at the bottom of the latch (203b); The fixed ring (201) and the movable ring (202) are both vertically provided with adjustment holes (204), and a transversely arranged movable groove (205) is provided near the adjustment holes (204). When the movable ring (202) is in an unfolded state, the angle between any two adjustment holes (204) is 120 degrees. The adjusting member (301) comprises a chain tooth (301a) at the top and a gear (301b) at the bottom, and the gear (301b) is placed in the adjusting hole (204); The friction member (302) comprises a rack (302a) and a rust removal plate (302b) fixedly connected to the rack (302a); the friction member (302) is inserted into the movable groove (205); and an adjustment spring (302c) is provided between the rust removal plate (302b) and the rack (302a).

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