A multi-joint fluid loading and unloading arm

Abstract

The present invention discloses a multi-joint fluid loading and unloading arm, which relates to the field of fluid loading and unloading arms. The present invention comprises a connecting tube 1 and a connecting tube 2, and a connecting mechanism is respectively arranged between a plurality of the connecting tubes 1 and a plurality of the connecting tubes 2, and the connecting mechanism comprises a limit assembly and a sliding assembly; the limit assembly comprises an L-shaped connecting tube arranged between the connecting tube 1 and the connecting tube 2, and the front end and the end of the L-shaped connecting tube are fixedly connected with a connecting ring 1. The present invention is provided with a connecting mechanism, and a plurality of balls can reduce the contact area between the connecting ring 2 and the slide groove 1, so that the connecting ring 2 on the straight pipe can slide smoothly on the inner wall of the slide groove 1, reducing the sliding resistance, and the connecting tube 2 and the connecting tube 1 can be more flexible when adjusting the angle. At the same time, the distribution of a plurality of balls can balance the force of the connecting ring 2, avoid wear caused by excessive local pressure, and extend the service life.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid loading and unloading arms, and in particular relates to a multi-joint fluid loading and unloading arm. Background Art

[0002] Fluid loading and unloading arms are equipment used to load and unload liquids or gases efficiently and safely. Fluid loading and unloading arms are widely used in various industries, such as oil and gas, chemicals, food and beverages, pharmaceuticals, and electricity. In the oil and gas industry, loading and unloading arms are used to load and unload crude oil, gasoline, diesel, aviation fuel, and liquefied natural gas, etc. In the chemical industry, loading and unloading arms are used to load and unload chemicals, solvents, acids and alkalis, etc. In the food and beverage industry, loading and unloading arms are used to load and unload milk, juice, beer, wine, etc. In the pharmaceutical industry, loading and unloading arms are used to load and unload medicines, raw materials and reagents, etc. In the power industry, loading and unloading arms are used to load and unload fuel oil, lubricating oil and coolant, etc.

[0003] However, in the existing multi-joint fluid loading and unloading arms, the multi-joint arms often need to bear a large weight, which will cause greater wear on the multi-joint arms when rotating the joints, thereby affecting the service life and working efficiency of the equipment. At the same time, due to the complex structure and multi-degree-of-freedom movement of the multi-joint arms, more factors need to be considered when installing multiple joint arms, and the installation is more cumbersome. Summary of the invention

[0004] The object of the present invention is to provide a multi-joint fluid loading and unloading arm. By providing a connecting mechanism, a plurality of ball bearings can reduce the contact area between the connecting ring 2 and the slide groove 1, so that the connecting ring 2 on the straight pipe can slide smoothly on the inner wall of the slide groove 1, reducing the sliding resistance, and the connecting pipe 2 and the connecting pipe 1 can be more flexible when adjusting the angle. At the same time, the distribution of the plurality of ball bearings can balance the force on the connecting ring 2, avoid wear caused by excessive local pressure, and extend the service life. The problem that in the existing multi-joint fluid loading and unloading arms, the multi-joint arms often need to bear a large weight, which will cause the multi-joint arms to wear more when rotating the joints, thereby affecting the service life and working efficiency of the equipment. At the same time, due to the complex structure and multi-degree-of-freedom movement of the multi-joint arms, more factors need to be considered when installing the multiple joint arms, and the installation is more cumbersome.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention is a multi-joint fluid loading and unloading arm, comprising a connecting pipe 1 and a connecting pipe 2, wherein a connecting mechanism is respectively arranged between a plurality of the connecting pipes 1 and a plurality of the connecting pipes 2, and the connecting mechanism comprises a limiting component and a sliding component;

[0007] The limiting assembly includes an L-shaped connecting pipe arranged between connecting pipe 1 and connecting pipe 2, the front end and the end of the L-shaped connecting pipe are fixedly connected with connecting ring 1, the interior of the two connecting rings 1 is provided with a slide groove 1, the inner walls of the two slide grooves 1 are slidably connected with connecting ring 2, the two connecting rings 2 are connected with straight pipes, the ends of the two straight pipes away from the connecting ring 2 are connected with flange 1, the outer walls of the connecting pipe 1 and the connecting pipe 2 are fixedly connected with flange 2, and bolt 1 is threadedly connected between several flanges 1 and several flanges 2.

[0008] Furthermore, the sliding assembly includes several slide grooves 2 each opened on the inner wall of several slide grooves 1, several slide grooves 3 each opened on the outer wall of several connecting rings 2, several inner walls of several slide grooves 3 each slidably connected with balls, and several balls are slidably connected to the inner wall of slide groove 2.

[0009] Furthermore, an adjustment mechanism 1 is provided between the connecting pipe 2 and the L-shaped connecting pipe, the connecting mechanism includes a fixing component and a lifting component, the fixing component includes a fixing ring 1 sleeved on the outer wall of the connecting pipe 2, the outer wall of the fixing ring 1 is hinged with a fixing ring 2, and a bolt 2 is threadedly connected between the fixing ring 1 and the fixing ring 2.

[0010] Furthermore, the lifting assembly includes a fixing rod fixedly connected to the outer wall of the fixing ring 1, an end of the fixing rod away from the fixing ring 1 is fixedly connected to an electric cylinder, an output end of the electric cylinder is fixedly connected to a hinge block, and a sliding rod 1 is rotatably passed through the hinge block.

[0011] Furthermore, a fixing ring three is fixedly connected to the outer wall of the L-shaped connecting pipe, a connecting plate is fixedly connected to the outer wall of the fixing ring three, a connecting groove is provided on the connecting plate, and the sliding rod one is slidably connected to the inner wall of the connecting groove.

[0012] Furthermore, an adjustment mechanism 2 is provided between the connecting tube 1 and the L-shaped connecting tube, the adjustment mechanism 2 includes a rebound assembly, a clamping assembly and a positioning assembly, the rebound assembly includes a fixing ring 4 fixedly connected to the outer wall of the L-shaped connecting tube, a plurality of sliding rods 2 are slidably passed through the fixing ring 4, the bottom ends of a plurality of sliding rods 2 are fixedly connected to a clamping ring 1, the top ends of a plurality of sliding rods 2 are fixedly connected to a top block, the outer walls of a plurality of sliding rods 2 are wound with a spring, one end of the spring is fixedly connected to the clamping ring 1, the other end of the spring is fixedly connected to the fixing ring 4, and the outer wall of the clamping ring 1 is fixedly connected to a pull plate.

[0013] Furthermore, the clamping assembly includes a second clamping ring which is sleeved on the outer wall of a connecting pipe, and the bottom surface of the second clamping ring is fixedly connected to two fixing plates, and threaded rods are threaded through the two fixing plates, and the two threaded rods are symmetrically arranged below the second clamping ring, and the ends of the two threaded rods that are close to each other are rotatably connected to arc-shaped clamping blocks, and the top surfaces of the two arc-shaped clamping blocks are slidably connected to the bottom surface of the second clamping ring, and the ends of the two threaded rods that are far away from each other are fixedly connected to knobs.

[0014] Furthermore, a plurality of latch teeth are provided on the sides of the first and second clamping rings that are close to each other, and the plurality of latch teeth are meshed with each other.

[0015] The present invention has the following beneficial effects:

[0016] 1. By providing a connecting mechanism, multiple balls can reduce the contact area between the connecting ring 2 and the slide groove 1, so that the connecting ring 2 on the straight tube can slide smoothly on the inner wall of the slide groove 1, reducing the sliding resistance, and the angle between the connecting tube 2 and the connecting tube 1 can be more flexible and free. At the same time, the distribution of multiple balls can balance the force of the connecting ring 2, avoid wear caused by excessive local pressure, and extend the service life.

[0017] 2. By providing the adjustment mechanism 1 and the adjustment mechanism 2, the electric cylinder can be driven to drive the hinge block to move to the left, and the slide bar 1 can slide upward along the connecting groove on the connecting plate. At this time, the angle between the connecting tube 1 and the connecting tube 2 is reduced, and the height of the right end of the connecting tube 2 is reduced. Conversely, the height of the right end of the connecting tube 2 is increased. By adjusting the angle between the two, the fluid in the connecting tube 1 and the connecting tube 2 can be transported to different heights, which is convenient for accurate liquid filling, liquid separation or transfer. At the same time, the pull plate can be pulled upward to rotate the connecting tube 2 at a horizontal angle. After rotating to the specified position, the pull plate can be released, and the compressed spring drives the clamp ring 1 to move downward, so that the two clamping teeth engage with each other, and the horizontal angle between the connecting tube 1 and the connecting tube 2 is fixed. By adjusting the horizontal and vertical angles between the connecting tube 1 and the connecting tube 2, the fluid delivery angle can be finely controlled to meet various fluid delivery needs.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of a partial cross-sectional structure of an L-shaped connecting pipe of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the L-shaped connecting pipe of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the connecting pipe 2 of the present invention;

[0024] Figure 5 It is a structural schematic diagram of the regulating mechanism 1 of the present invention;

[0025] Figure 6 It is a structural schematic diagram of the second adjusting mechanism of the present invention;

[0026] Figure 7 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0027] Figure 8 for Figure 4 Schematic diagram of the enlarged structure at point B in the middle.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] 1. Connecting pipe 1; 11. Connecting pipe 2; 2. Connecting mechanism; 3. Adjusting mechanism 1; 4. Adjusting mechanism 2; 21. L-shaped connecting pipe; 22. Connecting ring 1; 23. Slide 1; 24. Connecting ring 2; 25. Straight pipe; 26. Flange 1; 27. Flange 2; 28. Bolt 1; 231. Slide 2; 232. Slide 3; 233. Ball bearing; 31. Fixing ring 1; 32. Fixing ring 2; 33 , bolt two; 34, fixing rod; 35, electric cylinder; 36, hinge block; 37, slide bar one; 38, fixing ring three; 39, connecting plate; 391, connecting groove; 41, fixing ring four; 42, slide bar two; 43, retaining ring one; 44, top block; 45, spring; 46, pull plate; 47, retaining ring two; 471, fixing plate; 48, threaded rod; 49, arc-shaped block; 491, knob; 492, retaining tooth. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-Figure 8As shown, the present invention is a multi-joint fluid loading and unloading arm, including a connecting pipe 1 and a connecting pipe 2 11, and connecting mechanisms 2 are respectively arranged between a plurality of connecting pipes 1 and a plurality of connecting pipes 2 11, and the connecting mechanism 2 includes a limiting component and a sliding component.

[0032] The limiting assembly includes an L-shaped connecting pipe 21 arranged between the connecting pipe 1 and the connecting pipe 2 11, the front end and the end of the L-shaped connecting pipe 21 are fixedly connected with a connecting ring 1 22, the interiors of the two connecting rings 1 22 are provided with a slide groove 1 23, the inner walls of the two slide grooves 1 23 are slidably connected with a connecting ring 24, the two connecting rings 24 are connected with a straight pipe 25, the ends of the two straight pipes 25 away from the connecting ring 24 are connected with a flange 1 26, the outer walls of the connecting pipe 1 and the connecting pipe 2 11 are fixedly connected with a flange 27, a plurality of flanges 1 26 and a plurality of flanges 27 are respectively threadedly connected with bolts 1 28, and the sliding assembly includes sliding grooves 23 and 24 on the inner walls of the plurality of slide grooves 23. Groove 231, the outer walls of several connecting rings 24 are all provided with several sliding grooves 3 232, the inner walls of several sliding grooves 3 232 are all slidably connected with balls 233, and several balls 233 are slidably connected to the inner wall of the sliding groove 231. By providing a connecting mechanism 2, multiple balls 233 can reduce the contact area between the connecting ring 24 and the sliding groove 1 23, so that the connecting ring 24 on the straight tube 25 can slide smoothly on the inner wall of the sliding groove 1 23, reducing the sliding resistance, and the connecting pipe 2 11 and the connecting pipe 1 1 can be more flexible when adjusting the angle. At the same time, the distribution of multiple balls 233 can balance the force on the connecting ring 24, avoid wear caused by excessive local pressure, and extend the service life.

[0033] An adjusting mechanism 3 is provided between the connecting tube 2 11 and the plurality of L-shaped connecting tubes 21. The connecting mechanism 2 includes a fixing assembly and a lifting assembly. The fixing assembly includes a fixing ring 31 sleeved on the outer wall of the connecting tube 2 11. The outer wall of the fixing ring 31 is hinged with a fixing ring 2 32. A bolt 2 33 is threadedly connected between the fixing ring 31 and the fixing ring 2 32. The lifting assembly includes a fixing rod 34 fixedly connected to the outer wall of the fixing ring 31. An end of the fixing rod 34 away from the fixing ring 31 is fixedly connected to an electric cylinder 35. An output end of the electric cylinder 35 is fixedly connected to a hinge block 36. A sliding rod 37 is rotatably penetrated through the hinge block 36. A fixing ring 38 is fixedly connected to the outer wall of the L-shaped connecting tube 21. The outer wall of the fixing ring 38 is fixedly connected A connecting plate 39 is connected, and a connecting groove 391 is provided on the connecting plate 39. A slide bar 37 is slidably connected to the inner wall of the connecting groove 391. By providing an adjustment mechanism 3, when it is necessary to adjust the vertical angle between the connecting tube 1 and the connecting tube 2 11, the electric cylinder 35 can be driven to drive the hinge block 36 to move to the left, and the slide bar 37 slides upward along the connecting groove 391 on the connecting plate 39. At this time, the angle between the connecting tube 1 and the connecting tube 2 11 is reduced, and the height of the right end of the connecting tube 2 11 is reduced. Conversely, the height of the right end of the connecting tube 2 11 is increased. By adjusting the angle between the two, the fluid in the connecting tube 1 and the connecting tube 2 11 can be transported to different heights, which is convenient for accurate liquid filling, liquid separation or transfer.

[0034] An adjustment mechanism 24 is provided between the connecting tube 1 and the L-shaped connecting tube 21. The adjustment mechanism 24 includes a rebound component, a clamping component and a positioning component. The rebound component includes a fixed ring 41 fixedly connected to the outer wall of the L-shaped connecting tube 21. A plurality of slide bars 242 are slidably penetrated through the fixed ring 41. The bottom ends of the plurality of slide bars 42 are fixedly connected to a clamping ring 143. The top ends of the plurality of slide bars 42 are fixedly connected to a top block 44. The outer walls of the plurality of slide bars 42 are all wound with a spring 45. One end of the spring 45 is fixed to the clamping ring 143. The other end of the spring 45 is fixedly connected to the fixing ring 41, the outer wall of the snap ring 43 is fixedly connected with a pull plate 46, the clamping assembly includes a snap ring 2 47 sleeved on the outer wall of the connecting pipe 1, the bottom surface of the snap ring 2 47 is fixedly connected with two fixing plates 471, the two fixing plates 471 are threaded with threaded rods 48, the two threaded rods 48 are symmetrically arranged below the snap ring 2 47, the ends of the two threaded rods 48 close to each other are rotatably connected with arc-shaped clamping blocks 49, the top surfaces of the two arc-shaped clamping blocks 49 are connected to the clamping The bottom surface of the second ring 47 is slidably connected, and the ends of the two threaded rods 48 that are away from each other are fixedly connected with knobs 491. The sides of the snap ring 1 43 and the second snap ring 47 that are close to each other are provided with a plurality of latch teeth 492, and the plurality of latch teeth 492 are meshed with each other. By providing the adjustment mechanism 24, when it is necessary to adjust the horizontal angle between the connecting pipe 1 and the connecting pipe 2 11, the pull plate 46 can be pulled upwards, and the snap ring 1 43 is away from the snap ring 2 47 to drive the slide rod 2 42 to move upwards, and the spring 45 is compressed, and at the same time, the two The two latch teeth 492 move away from each other, and the connecting tube 11 can be manually rotated at this time to rotate the connecting tube 11 at a horizontal angle. After it is rotated to the specified position, the pull plate 46 can be loosened, and the compressed spring 45 drives the clamping ring 1 43 to move downward, so that the two latch teeth 492 engage with each other, and the horizontal angle between the connecting tube 1 and the connecting tube 2 11 is fixed. By adjusting the horizontal and vertical angles between the connecting tube 1 and the connecting tube 2 11, the fluid delivery angle can be finely controlled to meet various fluid delivery requirements.

[0035] A specific application of this embodiment is: by providing a connection mechanism 2, the flange 1 26, the flange 27 and the bolt 1 28 cooperate with each other to fix the L-shaped connection pipe 21 between the connection pipe 1 and the connection pipe 2 11, so that the connection pipe 1, the connection pipe 2 11 and the L-shaped connection pipe 21 can be quickly assembled, and can adapt to the transportation of fluids at different distances. The two slide grooves 1 23 and the connection ring 2 24 on the L-shaped connection pipe 21 cooperate with each other, so that the connection angle between the connection pipe 1 and the connection pipe 2 11 can be adjusted at different levels, so as to achieve Flexible and diverse pipeline connection and fluid delivery methods, while the slide groove 231, the slide groove 3 232 and the ball 233 cooperate with each other, and the multiple balls 233 can reduce the contact area between the connecting ring 24 and the slide groove 1 23, so that the connecting ring 24 on the straight pipe 25 can slide smoothly on the inner wall of the slide groove 1 23, reducing the sliding resistance, and the connecting pipe 2 11 and the connecting pipe 1 1 can be more flexible when adjusting the angle. At the same time, the distribution of multiple balls 233 can balance the force of the connecting ring 24, avoid wear caused by excessive local pressure, and extend the service life.

[0036] By providing an adjustment mechanism 1 3, after the connecting pipe 1 , the connecting pipe 2 11 and the L-shaped connecting pipe 21 are assembled, the fixing ring 1 31 and the fixing ring 2 32 can be sleeved on the connecting pipe 2 11, and the fixing ring 1 31 and the fixing ring 2 32 can be fastened to the outer wall of the connecting pipe 2 11 by the bolt 2 33. When it is necessary to adjust the vertical angle between the connecting pipe 1 and the connecting pipe 2 11, the electric cylinder 35 can be driven to drive the hinge block 36 to move to the left, and the slide bar 1 37 can slide upward along the connecting groove 391 on the connecting plate 39. At this time, the angle between the connecting pipe 1 and the connecting pipe 2 11 is reduced, and the height of the right end of the connecting pipe 2 11 is reduced. Conversely, the height of the right end of the connecting pipe 2 11 is increased. By adjusting the angle between the two, the fluid in the connecting pipe 1 and the connecting pipe 2 11 can be transported to different heights, which is convenient for accurate liquid filling, liquid separation or transfer.

[0037] By providing the adjustment mechanism 24, after the snap ring 247 is sleeved on the outer wall of the connecting pipe 1, the snap ring 247 is moved up and down so that the snap teeth 492 on the snap ring 247 and the snap teeth 492 on the snap ring 143 are meshed with each other. At this time, the knobs 491 on the two fixing plates 471 can be twisted to make the two threaded rods 48 rotate with each other. At this time, the two arc-shaped clamping blocks 49 are close to each other and tightly fit on the outer wall of the connecting pipe 1, so that the two arc-shaped clamping blocks 49 fasten the snap ring 247 to the outer wall of the connecting pipe 1. When it is necessary to adjust the horizontal angle between the connecting pipe 1 and the connecting pipe 2 11, the pull plate 46 can be pulled upwards. At this time, The snap ring 1 43 moves away from the snap ring 2 47 and drives the slide bar 2 42 to move upward. At this time, the spring 45 is compressed, and the two latch teeth 492 move away from each other. At this time, the connecting tube 2 11 can be manually rotated to make the connecting tube 2 11 rotate at a horizontal angle. After rotating to the specified position, the pull plate 46 can be released, and the compressed spring 45 drives the snap ring 1 43 to move downward, so that the two latch teeth 492 engage with each other, and the horizontal angle between the connecting tube 1 1 and the connecting tube 2 11 is fixed. By adjusting the horizontal and vertical angles between the connecting tube 1 1 and the connecting tube 2 11, the fluid delivery angle can be finely controlled to meet various fluid delivery requirements.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0039] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-joint fluid loading and unloading arm, comprising a connecting pipe 1 (1) and a connecting pipe 2 (11), characterized in that: A connecting mechanism (2) is respectively provided between the plurality of connecting pipes one (1) and the plurality of connecting pipes two (11), and the connecting mechanism (2) comprises a limit assembly and a sliding assembly; The limiting assembly comprises an L-shaped connecting pipe (21) arranged between the connecting pipe 1 (1) and the connecting pipe 2 (11), the front end and the end of the L-shaped connecting pipe (21) are fixedly connected to the connecting ring 1 (22), the interiors of the two connecting rings 1 (22) are provided with a slide groove 1 (23), the inner walls of the two slide grooves 1 (23) are slidably connected to the connecting ring 2 (24), the two connecting rings 2 (24) are connected to a straight pipe (25), the ends of the two straight pipes (25) away from the connecting ring 2 (24) are connected to a flange 1 (26), the outer walls of the connecting pipe 1 (1) and the connecting pipe 2 (11) are fixedly connected to the flange 2 (27), and a plurality of the flanges 1 (26) and a plurality of the flanges 2 (27) are respectively threadedly connected with bolts 1 (28); The sliding assembly comprises two slide grooves (231) each provided on the inner wall of a plurality of slide grooves one (23), the outer wall of a plurality of the connecting rings two (24) each comprises a plurality of slide grooves three (232), the inner wall of a plurality of the slide grooves three (232) each comprises a ball bearing (233) in sliding connection, and a plurality of the ball bearings (233) are in sliding connection with the inner wall of the slide groove two (231), an adjustment mechanism one (3) is provided between the connecting pipe two (11) and the L-shaped connecting pipe (21), the adjustment mechanism one (3) comprises a fixing assembly and a lifting assembly, the fixing assembly comprises a fixing ring one (31) sleeved on the outer wall of the connecting pipe two (11), the outer wall of the fixing ring one (31) is hinged with a fixing ring two (32), and a bolt two (33) is threadedly connected between the fixing ring one (31) and the fixing ring two (32); The lifting assembly comprises a fixing rod (34) fixedly connected to the outer wall of the fixing ring (31); an end of the fixing rod (34) away from the fixing ring (31) is fixedly connected to an electric cylinder (35); an output end of the electric cylinder (35) is fixedly connected to a hinge block (36); a sliding rod (37) is rotatably penetrated through the hinge block (36); The outer wall of the L-shaped connecting tube (21) is fixedly connected to a fixing ring three (38), the outer wall of the fixing ring three (38) is fixedly connected to a connecting plate (39), a connecting groove (391) is formed on the connecting plate (39), and the sliding rod one (37) is slidably connected to the inner wall of the connecting groove (391); An adjustment mechanism 2 (4) is provided between the connecting tube 1 (1) and the L-shaped connecting tube (21), the adjustment mechanism 2 (4) comprising a rebound component, a clamping component and a positioning component, the rebound component comprising a fixing ring 4 (41) fixedly connected to the outer wall of the L-shaped connecting tube (21), a plurality of sliding rods 2 (42) slidingly passing through the fixing ring 4 (41), a plurality of the bottom ends of the sliding rods 2 (42) being fixedly connected to a clamping ring 1 (43), a plurality of the top ends of the sliding rods 2 (42) being fixedly connected to a top block (44), a plurality of the outer walls of the sliding rods 2 (42) being wound with a spring (45), one end of the spring (45) being fixedly connected to the clamping ring 1 (43), the other end of the spring (45) being fixedly connected to the fixing ring 4 (41), and a pull plate (46) being fixedly connected to the outer wall of the clamping ring 1 (43); The clamping assembly comprises a second clamping ring (47) sleeved on the outer wall of the first connecting pipe (1), the bottom surface of the second clamping ring (47) being fixedly connected to two fixing plates (471), the two fixing plates (471) both having threaded rods (48) threadedly penetrated therethrough, the two threaded rods (48) being symmetrically arranged below the second clamping ring (47), the ends of the two threaded rods (48) close to each other being rotatably connected to arc-shaped clamping blocks (49), the top surfaces of the two arc-shaped clamping blocks (49) being slidably connected to the bottom surface of the second clamping ring (47), and the ends of the two threaded rods (48) far from each other being fixedly connected to knobs (491); A plurality of latch teeth (492) are provided on the mutually adjacent sides of the first latch ring (43) and the second latch ring (47), and the plurality of latch teeth (492) are meshed with each other.

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