A lightweight and high-strength thermal insulation foam brick made from tailings solid waste resources

Abstract

The present invention discloses a lightweight, high-strength, heat-insulating foam brick prepared by utilizing tailings solid waste resources, belonging to the technical field of foam bricks, including a foam brick, wherein a plurality of limit grooves are provided on one side of the foam brick, a plurality of limit columns are fixedly connected to a side of the foam brick away from the limit grooves, the plurality of limit grooves are adapted to the plurality of limit columns, and two plug rods symmetrically arranged up and down are fixedly connected to one side of the foam brick. In the present invention, by setting a positioning mechanism, when four foam bricks are spliced ​​together, the top block is pulled to drive the pull rod to move upward, the pull rod drives the connecting block to move upward, and one end of the pull ropes is pulled upward at the same time, and under the action of the guide wheel, the pull rope can pull the positioning block to move, and the positioning block moves and retracts into the through hole, so that the positioning block can be inserted into the positioning groove, so that the plurality of positioning blocks can fix the plurality of foam bricks at the same time, and the foam bricks are more stable after being fixed, and will not warp.

Description

Technical Field

[0001] The invention belongs to the technical field of foam bricks, and in particular relates to a lightweight and high-strength heat-insulating foam brick prepared by recycling tailings solid waste. Background Art

[0002] Foam bricks have good compressive properties: the compressive strength is greater than 0.5Mpa, the highest strength can reach more than 10.5Mpa, no cracking, long service life, and foam bricks are also made of different raw materials. Foam cement bricks are made by mixing small foam particles with cement. They have high-quality properties of light weight, heat preservation, sound insulation, and fire prevention. In addition, the cost is greatly reduced due to the use of small diameters. They are ideal for non-load-bearing walls. Autoclaved foam concrete bricks are mainly made of cement, slag powder, and river sand as raw materials. After mixing, they are foamed by pressurized air, and air is forced into the mixed slurry to form a micro-bubble structure of concrete casting molds. They are made through processes such as autoclave reaction. It is an environmentally friendly, energy-saving, and stable new wall material. Buildings using autoclaved foam concrete bricks as wall materials have been inspected two years after completion and use. The quality is excellent and meets the national standards for engineering quality, sound insulation, energy saving, and fire prevention. It is also a brick for non-load-bearing walls.

[0003] Existing foam bricks are generally spliced ​​in single pieces, but there is no better way to fix the foam bricks during the splicing process. As a result, multiple foam bricks are prone to looseness, which can easily cause the foam bricks to warp after installation. Although the foam bricks themselves have a certain sound insulation effect, if the application scenario generates loud noise, the foam bricks cannot effectively isolate all sounds, and the sound insulation effect still has certain shortcomings. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing foam bricks are generally spliced ​​in single pieces, but there is no better fixing method to fix the foam bricks during the splicing process, and multiple foam bricks are prone to looseness, which easily leads to the foam bricks curling up after installation. Although the foam bricks themselves have a certain sound insulation effect, if the application scenario will generate loud noise, the foam bricks cannot effectively isolate all sounds, and the sound insulation effect is still insufficient. A lightweight and high-strength thermal insulation foam brick prepared by utilizing tailings solid waste resources is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A lightweight, high-strength, heat-insulating foam brick prepared by utilizing tailings solid waste resources comprises a foam brick, a plurality of limit grooves are provided on one side of the foam brick, a plurality of limit columns are fixedly connected to a side of the foam brick away from the limit grooves, the plurality of limit grooves are matched with the plurality of limit columns, two plug rods symmetrically arranged up and down are fixedly connected to one side of the foam brick, the number of the foam bricks is four, the four foam bricks are connected by a positioning mechanism, a part of the positioning mechanism is arranged in an arc groove provided on one side of the foam brick, a connecting mechanism is fixedly connected to the lower side of the foam brick, and a sound insulation material attachment mechanism is fixedly connected to the bottom of the connecting mechanism.

[0007] As a further description of the above technical solution:

[0008] The positioning mechanism comprises a conical block arranged in the arc groove, the upper surface of the conical block is fixedly connected with a top block, the lower surface of the conical block is fixedly connected with a connecting block via a pull rod, and the connecting block is located in a cavity opened inside the conical block.

[0009] As a further description of the above technical solution:

[0010] A plurality of drawstrings are fixedly connected to the lower surface of the connection block, and the other ends of the drawstrings are fixedly connected to positioning blocks, which are arranged in through holes formed on the outer surface of the conical block.

[0011] As a further description of the above technical solution:

[0012] One end of the positioning block is stuck in the positioning groove opened inside the arc groove, and the other end of the positioning block is fixedly connected to one side of the baffle through the first spring, the baffle is fixedly connected to the lower surface of the inner wall of the cavity, the pull rope passes through the through hole opened on one side of the baffle, the pull rope passes around the outer surface of the guide wheel, and the guide wheel is fixedly connected to one side of the baffle.

[0013] As a further description of the above technical solution:

[0014] The connecting mechanism includes a connecting shell attached to the lower side of the foam brick, two limit plates are arranged in the connecting shell, grooves are provided on the opposing surfaces of the two limit plates, springs are fixedly connected in the grooves, the opposing surfaces of the two springs are respectively fixedly connected to the two side surfaces of the inner wall of the connecting shell, a toggle block is fixedly connected to one side of the limit plate, and the toggle block passes through a toggle hole provided on one side of the connecting shell.

[0015] As a further description of the above technical solution:

[0016] An L-shaped block is fixedly connected to one side of the limiting plate. The L-shaped block is located in a through hole opened on one side of the connecting shell, and the L-shaped block is located in an L-shaped groove opened on one side of the foam brick.

[0017] As a further description of the above technical solution:

[0018] The sound insulation material attachment mechanism includes a pressure plate, and the four corners of the pressure plate close to one side of the connecting shell are fixedly connected with fixing ropes, one end of the fixing rope passes through the interior of the connecting shell, and one end of the fixing rope passes through the limiting hole opened in the limiting plate and is wound around the outer surface of the winding wheel. There are two winding wheels, and the two winding wheels are both clamped on the outer surface of the rotating shaft. Two bearings are provided on the outer side of the rotating shaft, and the two bearings are respectively clamped on the two side surfaces of the connecting shell.

[0019] As a further description of the above technical solution:

[0020] One end of the rotating shaft is fixedly connected to a side plate, one side of the side plate is fixedly connected to a pressing plate via a telescopic rod, one side of the pressing plate is fixedly connected to a plurality of positioning rods, the plurality of positioning rods are evenly arranged in a ring shape, the positioning rods pass through a sliding rod opened inside the side plate and extend into a positioning groove opened on one side of the connecting shell.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] 1. In the present invention, by setting a positioning mechanism, when four foam bricks are spliced ​​together, the top block is pulled to drive the pull rod to move upward, the pull rod drives the connecting block to move upward, and one end of the pull ropes is pulled upward at the same time. Under the action of the guide wheel, the pull rope can pull the positioning block to move, and the positioning block moves and retracts into the through hole, and the conical block is placed in the four arc grooves. After the top block is released, the first spring extends by its own elastic force, and the first spring can push the positioning block to move, so that the positioning block can be stuck in the positioning groove, so that the multiple positioning blocks can fix the multiple foam bricks at the same time. After being fixed, the foam bricks are more stable and will not warp.

[0023] 2. In the present invention, by setting a connecting mechanism, if it is necessary to install sound insulation material, the two toggle blocks are controlled to approach each other, and the two toggle blocks respectively drive the two L-shaped blocks to approach each other, and then the two L-shaped blocks are placed in the L-shaped groove. After the two toggle blocks are released, the second spring contracts through its own elastic force to pull the limit plate to move, and the two limit plates respectively drive the two L-shaped blocks away from each other, so that the L-shaped block can be inserted into the L-shaped groove, thereby fixing the connecting shell and facilitating the installation of sound insulation material.

[0024] 3. In the present invention, by providing a sound insulation material attachment mechanism, the side plate can be rotated to drive the rotating shaft to rotate, and the rotating shaft can drive the winding wheel to rotate. The winding wheel rotates to wind up the fixing rope, so that the fixing rope can pull the pressing plate close to the foam brick, and the sound insulation material to be installed is placed between multiple blocks. The blocks can preliminarily limit the position of the sound insulation material. The fixing rope can be rolled up by continuously rotating the side plate, and the pressing plate gradually moves close to the connecting shell and squeezes and fixes the sound insulation material. When the sound insulation material is fixed, the pressing plate is pushed to move. Under the action of the telescopic rod, the pressing plate approaches the side plate and drives multiple positioning rods to be inserted into multiple positioning grooves respectively, so that the rotating shaft can be effectively fixed to prevent the winding wheel from loosening and releasing the fixing rope, so that the fixing rope will not loosen and will not affect the tight fixation of the sound insulation material. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the three-dimensional structure of a lightweight, high-strength, thermally insulating foam brick prepared by utilizing tailings solid waste resources proposed by the present invention;

[0026] Figure 2 This is a schematic structural diagram of a side view of a foam brick, a connecting mechanism and a sound insulation material attachment mechanism in a lightweight high-strength heat-insulating foam brick prepared by utilizing tailings solid waste resources proposed by the present invention;

[0027] Figure 3 A schematic diagram of the cross-sectional structure of a connection mechanism in a lightweight, high-strength, thermally insulating foam brick prepared by utilizing tailings solid waste resources proposed by the present invention;

[0028] Figure 4 This is a schematic diagram of the enlarged structure of B in a lightweight, high-strength, thermally insulating foam brick prepared by utilizing tailings solid waste resources proposed by the present invention;

[0029] Figure 5 This is a structural schematic diagram of a central positioning mechanism of a lightweight, high-strength, thermally insulating foam brick prepared by utilizing tailings solid waste resources proposed by the present invention;

[0030] Figure 6 This is a schematic diagram of the enlarged structure of A in a lightweight, high-strength, thermally insulating foam brick prepared by utilizing tailings solid waste resources proposed in the present invention.

[0031] Legend:

[0032] 1. Foam brick; 2. Limit column; 3. Limit groove; 4. Insert rod; 5. Positioning mechanism; 51. Top block; 52. Conical block; 53. Pull rod; 54. Connecting block; 55. Cavity; 56. Pull rope; 57. Guide wheel; 58. Baffle plate; 59. First spring; 510. Through hole; 511. Positioning block; 6. Connecting mechanism; 61. Connecting shell; 62. Second spring; 63. Limit plate; 64. Toggle block; 65. Through hole; 66. L-shaped block; 67. L-shaped groove; 68. Groove; 7. Sound insulation material attachment mechanism; 71. Pressing plate; 72. Fixing rope; 73. Baffle block; 74. Positioning rod; 75. Winding wheel; 76. Limit hole; 77. Positioning groove; 78. Rotating shaft; 79. Pressing block; 710. Telescopic rod; 711. Side plate; 712. Sliding hole. DETAILED DESCRIPTION

[0033] 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.

[0034] See also Figure 1-6 The present invention provides a technical solution: a lightweight, high-strength, heat-insulating foam brick 1 prepared by utilizing tailings solid waste resources, comprising a foam brick 1, a plurality of limit grooves 3 are provided on one side of the foam brick 1, a plurality of limit columns 2 are fixedly connected to a side of the foam brick 1 away from the limit grooves 3, the plurality of limit grooves 3 are adapted to the plurality of limit columns 2, two plug rods 4 symmetrically arranged up and down are fixedly connected to one side of the foam brick 1, the number of foam bricks 1 is four, the four foam bricks 1 are connected by a positioning mechanism 5, a part of the positioning mechanism 5 is arranged in an arc groove provided on one side of the foam brick 1, the positioning mechanism 5 comprises a conical block 52 arranged in the arc groove, a top block 51 is fixedly connected to the upper surface of the conical block 52, and a bottom surface of the conical block 52 is passed through The pull rod 53 is fixedly connected with a connecting block 54, and the connecting block 54 is located in a cavity 55 opened inside the conical block 52. A plurality of pull ropes 56 are fixedly connected to the lower surface of the connecting block 54, and the other end of the pull rope 56 is fixedly connected to a positioning block 511, which is arranged in a through hole 510 opened on the outer surface of the conical block 52. One end of the positioning block 511 is stuck in a positioning groove 77 opened inside the arc groove, and the other end of the positioning block 511 is fixedly connected to one side of the baffle 58 through a first spring 59. The baffle 58 is fixedly connected to the lower surface of the inner wall of the cavity 55, and the pull rope 56 passes through a through hole 65 opened on one side of the baffle 58. The pull rope 56 passes around the outer surface of the guide wheel 57, and the guide wheel 57 is fixedly connected to one side of the baffle 58.

[0035] The specific implementation is as follows: by setting a positioning mechanism 5, when four foam bricks 1 are spliced ​​together, the top block 51 is pulled to drive the pull rod 53 to move upward, the pull rod 53 drives the connecting block 54 to move upward, and pulls one end of multiple pull ropes 56 to move upward at the same time. Under the action of the guide wheel 57, the pull rope 56 can pull the positioning block 511 to move, and the positioning block 511 moves and retracts into the through hole 510, and the conical block 52 is placed in the four arc grooves. After the top block 51 is released, the first spring 59 extends by its own elastic force, and the first spring 59 can push the positioning block 511 to move, so that the positioning block 511 can be inserted into the positioning groove 77, so that the multiple positioning blocks 511 can fix the multiple foam bricks 1 at the same time. After being fixed, the foam brick 1 is more stable and will not warp.

[0036] The lower side of the foam brick 1 is fixedly connected with a connecting mechanism 6, and the connecting mechanism 6 includes a connecting shell 61 attached to the lower side of the foam brick 1, and two limit plates 63 are arranged in the connecting shell 61, and grooves 68 are provided on the surfaces away from each other of the two limit plates 63, and springs are fixedly connected in the grooves 68, and the surfaces away from each other of the two springs are respectively fixedly connected to the two side surfaces of the inner wall of the connecting shell 61, and a toggle block 64 is fixedly connected to one side of the limit plate 63, and the toggle block 64 penetrates into the toggle hole provided in one side of the connecting shell 61, and an L-shaped block 66 is fixedly connected to one side of the limit plate 63, and the L-shaped block 66 is located in a through hole 65 provided in one side of the connecting shell 61, and the L-shaped block 66 is located in an L-shaped groove 67 provided in one side of the foam brick 1;

[0037] The specific implementation is as follows: by setting a connecting mechanism 6, if sound insulation material needs to be installed, the two toggle blocks 64 are controlled to approach each other, and the two toggle blocks 64 respectively drive the two L-shaped blocks 66 to approach each other, and then the two L-shaped blocks 66 are placed in the L-shaped groove 67. After the two toggle blocks 64 are released, the second spring 62 contracts through its own elastic force to pull the limit plate 63 to move, and the two limit plates 63 respectively drive the two L-shaped blocks 66 away from each other, so that the L-shaped block 66 can be inserted into the L-shaped groove 67, thereby fixing the connecting shell 61 and facilitating the installation of sound insulation material.

[0038] The bottom of the connecting mechanism 6 is fixedly connected to a sound insulation material attachment mechanism 7, and the sound insulation material attachment mechanism 7 includes a pressing plate 71, and the four corners of the pressing plate 71 close to one side of the connecting shell 61 are fixedly connected to fixing ropes 72, one end of the fixing rope 72 passes through the inside of the connecting shell 61, and one end of the fixing rope 72 passes through the limiting hole 76 opened in the limiting plate 63 and is wound around the outer surface of the winding wheel 75. There are two winding wheels 75, and the two winding wheels 75 are both clamped on the outer surface of the rotating shaft 78. Two bearings are sleeved on the outer side of the rotating shaft 78, and the two bearings are respectively clamped on the two side surfaces of the connecting shell 61. One end of the rotating shaft 78 is fixedly connected to a side plate 711, and one side of the side plate 711 is fixedly connected to the pressing plate 71 through a telescopic rod 710. A plurality of positioning rods 74 are fixedly connected to one side of the pressing plate 71, and the plurality of positioning rods 74 are evenly arranged in a ring shape. The positioning rods 74 pass through the sliding rod opened in the side plate 711 and extend into the positioning groove 77 opened on one side of the connecting shell 61.

[0039] The specific implementation is as follows: by setting a sound insulation material adding mechanism 7, rotating the side plate 711 can drive the rotating shaft 78 to rotate, and the rotating shaft 78 can drive the winding wheel 75 to rotate. The winding wheel 75 rotates to wind up the fixing rope 72, so that the fixing rope 72 can pull the pressing plate 71 close to the foam brick 1, and the sound insulation material to be installed is placed between multiple blocks 73. The blocks 73 can preliminarily limit the position of the sound insulation material. The fixing rope 72 can be rolled up by continuously rotating the side plate 711, and the pressing plate 71 gradually moves close to the connecting shell 61 and squeezes and fixes the sound insulation material. When the sound insulation material is fixed, the pressing plate 71 is pushed to move. Under the action of the telescopic rod 710, the pressing plate 71 approaches the side plate 711 and drives multiple positioning rods 74 to be inserted into multiple positioning grooves 77 respectively, so that the rotating shaft 78 can be effectively fixed, and the winding wheel 75 is prevented from loosening and releasing the fixing rope 72, so that the fixing rope 72 will not loosen and will not affect the tight fixation of the sound insulation material.

[0040] Working principle: When in use, four foam bricks 1 are spliced ​​together, the limiting column 2 of one foam brick 1 is inserted into the limiting groove 3 of another foam brick 1, and the insertion rod 4 on the other group of foam bricks 1 is inserted into the limiting groove 3 and the limiting column 2, and the top block 51 is pulled to drive the pull rod 53 to move upward, and the pull rod 53 drives the connecting block 54 to move upward, and one end of the pull ropes 56 is pulled upward at the same time. Under the action of the guide wheel 57, the pull rope 56 can pull the positioning block 511 to move, and the positioning block 511 moves and retracts into the through hole 510, and the conical block 52 is placed in the four arc surface grooves. After the top block 51 is released, the first spring 59 is extended by its own elastic force, and the first spring 59 can push the positioning block 511 to move, so that the positioning block 511 can be inserted into the positioning groove 77, so that the multiple positioning blocks 511 can fix the multiple foam bricks 1 at the same time. After the foam bricks 1 are fixed, they are more stable and will not tilt. If sound insulation materials need to be installed, the two toggle blocks 64 are controlled to move closer to each other, and the two toggle blocks 64 respectively drive the two L-shaped blocks 66 to move closer to each other, and then the two L-shaped blocks 66 are placed in the L-shaped groove 67. After the two toggle blocks 64 are released, The second spring 62 contracts by its own elastic force to pull the limit plate 63 to move, and the two limit plates 63 respectively drive the two L-shaped blocks 66 to move away from each other, so that the L-shaped block 66 can be inserted into the L-shaped groove 67, so that the connecting shell 61 can be fixed, which is convenient for installing sound insulation material. The rotating shaft 78 can be driven to rotate by rotating the side plate 711, and the rotating shaft 78 can drive the winding wheel 75 to rotate. The winding wheel 75 rotates to rewind the fixing rope 72, so that the fixing rope 72 can pull the pressing plate 71 closer to the foam brick 1, and the sound insulation material to be installed is placed between the multiple blocks 73, and the blocks 73 can The position of the sound insulation material is preliminarily limited, and the fixing rope 72 can be rolled up by continuously rotating the side plate 711. At the same time, the pressure plate 71 gradually moves close to the connecting shell 61 and squeezes and fixes the sound insulation material. When the sound insulation material is fixed, the pressure plate 71 is pushed to move. Under the action of the telescopic rod 710, the pressure plate 71 approaches the side plate 711 and drives multiple positioning rods 74 to be inserted into multiple positioning grooves 77 respectively, so that the rotating shaft 78 can be effectively fixed to prevent the winding wheel 75 from loosening and releasing the fixing rope 72, so that the fixing rope 72 will not loosen and will not affect the tight fixation of the sound insulation material.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A lightweight, high-strength, heat-insulating foam brick prepared by recycling tailings solid waste, comprising a foam brick (1), characterized in that: A plurality of limiting grooves (3) are provided on one side of the foam brick (1); a plurality of limiting columns (2) are fixedly connected to a side of the foam brick (1) away from the limiting grooves (3); the plurality of limiting grooves (3) are matched with the plurality of limiting columns (2); two plugging rods (4) symmetrically arranged up and down are fixedly connected to one side of the foam brick (1); there are four foam bricks (1); the four foam bricks (1) are connected via a positioning mechanism (5); a part of the positioning mechanism (5) is arranged in an arc groove provided on one side of the foam brick (1); a connecting mechanism (6) is fixedly connected to the lower side of the foam brick (1); a sound insulation material attaching mechanism (7) is fixedly connected to the bottom of the connecting mechanism (6); The positioning mechanism (5) comprises a conical block (52) arranged in the arc surface groove, the upper surface of the conical block (52) is fixedly connected to a top block (51), the lower surface of the conical block (52) is fixedly connected to a connecting block (54) via a pull rod (53), and the connecting block (54) is located in a cavity (55) opened inside the conical block (52); A plurality of pull ropes (56) are fixedly connected to the lower surface of the connection block (54); the other ends of the pull ropes (56) are fixedly connected to a positioning block (511); and the positioning block (511) is disposed in a through hole (510) formed on the outer surface of the conical block (52); One end of the positioning block (511) is clamped in a positioning groove provided inside the arc groove, and the other end of the positioning block (511) is fixedly connected to a side surface of the baffle (58) via a first spring (59); the baffle (58) is fixedly connected to the lower surface of the inner wall of the cavity (55); the pull rope (56) passes through a through hole (65) provided on a side surface of the baffle (58); the pull rope (56) passes around the outer surface of the guide wheel (57); and the guide wheel (57) is fixedly connected to a side surface of the baffle (58).

2. The lightweight and high-strength thermal insulation foam brick prepared by utilizing tailings solid waste resources according to claim 1, characterized in that: The connection mechanism (6) comprises a connection shell (61) attached to the lower side of the foam brick (1), two limit plates (63) are arranged in the connection shell (61), the surfaces of the two limit plates (63) that are separated from each other are provided with grooves (68), springs are fixedly connected in the grooves (68), the surfaces of the two springs that are separated from each other are respectively fixedly connected to the two side surfaces of the inner wall of the connection shell (61), a side surface of the limit plate (63) is fixedly connected to a toggle block (64), and the toggle block (64) passes through a toggle hole provided in the side surface of the connection shell (61).

3. The lightweight and high-strength thermal insulation foam brick prepared by utilizing tailings solid waste resources according to claim 2 is characterized in that: An L-shaped block (66) is fixedly connected to one side of the limiting plate (63); the L-shaped block (66) is located in a through hole (65) opened on one side of the connecting shell (61); and the L-shaped block (66) is located in an L-shaped groove (67) opened on one side of the foam brick (1).

4. The lightweight and high-strength thermal insulation foam brick prepared by utilizing tailings solid waste resources according to claim 1, characterized in that: The sound insulation material attachment mechanism (7) comprises a pressing plate (71), and fixing ropes (72) are fixedly connected to the four corners of the pressing plate (71) near one side of the connecting shell (61), and one end of the fixing rope (72) passes through the inside of the connecting shell (61), and one end of the fixing rope (72) passes through a limiting hole (76) provided in the limiting plate (63) and is wound around the outer surface of a winding wheel (75). There are two winding wheels (75), and the two winding wheels (75) are both clamped on the outer surface of a rotating shaft (78). Two bearings are sleeved on the outer side of the rotating shaft (78), and the two bearings are respectively clamped on the two side surfaces of the connecting shell (61).

5. The lightweight and high-strength thermal insulation foam brick prepared by utilizing tailings solid waste resources according to claim 4 is characterized in that: One end of the rotating shaft (78) is fixedly connected to a side plate (711), one side of the side plate (711) is fixedly connected to a pressing plate (71) via a telescopic rod (710), one side of the pressing plate (71) is fixedly connected to a plurality of positioning rods (74), the plurality of positioning rods (74) are evenly arranged in a ring shape, and the positioning rods (74) penetrate a sliding rod provided inside the side plate (711) and extend into a positioning groove provided on one side of the connecting shell (61).

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