Grain fraction optimizing device for coal mine filling cementing material

Abstract

The utility model discloses a coal mine filling cementing material size fraction optimizing device which comprises a base, two sets of stand columns are symmetrically installed on the top of the base, a supporting table is fixedly installed on the tops of the two sets of stand columns, an air channel is formed in one side of the interior of the supporting table, and a fan is fixedly installed on one side of the interior of the air channel. The device further comprises a box body fixedly installed at the top of the supporting table, a feeding port is connected to one side of the top of the box body in a penetrating mode, discharging pipes are symmetrically connected to the two sides of the box body in a penetrating mode, and a storage hopper is fixedly installed at the top end of the interior of the box body; powder selecting assemblies are arranged in the supporting table and the box body, and a filtering assembly is arranged on one side of the supporting table; according to the coal mine filling cementing material particle sorting device, fine powder and coarse powder can be sorted out of coal mine filling cementing material particles, impurities can be sorted out, discharging after sorting is facilitated, and practicability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial equipment, in particular to a device for optimizing the particle size of coal mine filling gelling materials. Background Art

[0002] Coal mine filling cementitious material particles mainly refer to a granular cementitious material used in the coal mine filling mining process. This material can form a solid with certain strength and stability after adding water and mixing, which is used to support the roof of the goaf and prevent the surface from sinking and mine collapse. Different filling operations may have different requirements for particle size, so coal mine filling cementitious material particles need to be graded when used.

[0003] Publication No. CN213967714U discloses a separation device for a powder separator. The patent can achieve effective separation of fine powder, coarse powder and impurity agglomerates by setting a central shaft, a storage hopper, a rotor, a second sleeve, a spreading plate, a shaft end cover, a filter block and a shaft sleeve. While separating the target product, it can also remove impurities and agglomerated products in the product, which can achieve the user's expected goals faster and improve the operation accuracy. However, the patent still has the following problems in actual use:

[0004] Through the provision of the middle shaft, storage hopper, rotor, second sleeve, spreading plate, shaft end cover, filter block and shaft sleeve, effective separation of fine powder, coarse powder and impurity agglomerates can be achieved. However, in actual use, impurities in the raw materials will remain inside the rotor, making it inconvenient to remove the impurities. After long-term use, impurities will accumulate more and more inside the rotor, which will affect the subsequent powder selection operation of the material.

[0005] A device for optimizing the particle size of coal mine filling cementitious materials is proposed to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a device for optimizing the particle size of coal mine filling cementitious materials, so as to solve the problem proposed in the above-mentioned background technology that the effective separation of fine powder, coarse powder and impurity agglomerates can be achieved through the arrangement of the central shaft, storage hopper, rotor, second sleeve, spreading plate, shaft end cover, filter block and shaft sleeve, but in actual use, the impurities in the raw materials will remain inside the rotor, which is inconvenient to remove the impurities. After long-term use, the impurities will accumulate more and more inside the rotor, which will affect the subsequent powder selection operation of the material.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for optimizing the particle size of coal mine filling cementitious materials, comprising a base;

[0008] Two groups of columns are symmetrically installed on the top of the base, and a support platform is fixedly installed on the top of the two groups of columns, and an air duct is opened on one side of the inner part of the support platform, and a fan is fixedly installed on one side of the inner part of the air duct, and a discharge trough is opened through the top of the support platform, and the air duct is connected with the discharge trough through and through;

[0009] Also includes:

[0010] A box is fixedly installed on the top of the support platform, and a feed port is connected through one side of the top of the box, and discharge pipes are symmetrically connected through both sides of the box, and a storage hopper is fixedly installed on the top of the box, and powder selection components are arranged inside the support platform and the box, and a filtering component is arranged on one side of the support platform;

[0011] Wherein, the powder selection assembly includes a driving motor fixedly mounted on the top of the box body, and a rotating shaft is fixedly mounted on the output end of the driving motor, and the rotating shaft is rotatably connected to the box body and the storage hopper through a bearing;

[0012] Wherein, a mounting rod is fixedly installed at the lower part of the interior of the box body, and the rotating shaft is rotatably connected to the mounting rod, and a material distribution tray is fixedly installed at the lower part of the exterior of the rotating shaft.

[0013] Preferably, a cam is fixedly mounted on the bottom of the rotating shaft, a movable rod is provided at the lower inner part of the box body, a mounting plate is fixedly mounted on the top of the movable rod, and the cam is slidably connected to the mounting plate.

[0014] Preferably, a fixed sleeve is symmetrically passed through and fixedly connected above the movable rod, and a support rod is slidably connected inside the upper fixed sleeve, and the support rod is fixedly connected to the box body, and a positioning rod is slidably connected inside the lower fixed sleeve, and the positioning rod is fixedly connected to the discharge chute.

[0015] Preferably, a return spring is sleeved on one side of the outside of the support rod, and one side of the return spring is fixedly connected to the upper fixed sleeve, and a mounting block is fixedly installed on the other end of the return spring, and the mounting block is fixedly connected to the support rod, and a sorting bucket is provided at the bottom of the support platform below the discharge chute, and a fixed rod is fixedly installed inside the sorting bucket, and the fixed rod is fixedly connected to the movable rod, and a plurality of filter holes are opened through the bottom of the sorting bucket.

[0016] Preferably, a cross bar is fixedly installed on one side of the top of the sorting bucket, and a connecting block is fixedly connected to the other side of the top of the sorting bucket and the top of the cross bar, and sliding grooves are symmetrically opened on both sides of the bottom of the support platform, and the sliding blocks are slidably connected inside the sliding grooves, and the two sliding blocks are fixedly connected to the two connecting blocks respectively, and a telescopic rod is fixedly installed on one side of the inside of the sliding groove, and a telescopic spring is sleeved on the outside of the telescopic rod, and one end of the telescopic spring is fixedly connected to the sliding groove, and the other end of the telescopic rod and the telescopic spring is fixedly connected to the sliding block.

[0017] Preferably, the filter assembly includes an installation frame arranged on a support platform located on one side of the air duct, and a filter net is fixedly installed inside the installation frame, and two groups of movable grooves are symmetrically opened on both sides of the installation frame inside the support platform, and movable rods are slidably connected inside the two groups of movable grooves.

[0018] Preferably, a tension spring is sleeved on one side of the outer side of the two groups of moving rods, and one end of the tension spring is fixedly connected to the support platform, and a positioning sleeve is fixedly installed on the other end of the tension spring, and the positioning sleeve is fixedly connected to the moving rod, and the internal sliding connection of the positioning sleeve is connected to a limiting rod, and two groups of limiting grooves are symmetrically opened on one side of the mounting frame, and the limiting rod is snap-connected with the limiting groove.

[0019] Compared with the prior art, the utility model has the following beneficial effects: the coal mine filling cementitious material particle size optimization device is provided with a powder selection component inside the support platform and the box body, so that the coal mine filling cementitious material particles can be sorted into fine powder and coarse powder, and impurities can be sorted out, which is convenient for discharging after sorting and improves practicality. The specific contents are as follows:

[0020] 1. A powder selection component is arranged inside the support platform and the box body. When selecting the powder of the material, the fan inside the air duct is started, and the driving motor is started to drive the rotating shaft to rotate, so that the dividing plate is rotated, and the material enters the box body from the feeding port. Then, the wind blown by the fan can enter the box body through the discharging trough, and the box body is circulated. After the material enters the storage hopper, it falls and is divided by the dividing plate. Then, the fine powder can be discharged through the discharging pipe under the action of wind force, and then the coarse wind and impurities fall into the discharging trough and fall into the inside of the sorting bucket. After the rotating shaft rotates, it drives the cam to rotate. The rotation of the cam can push the mounting plate to move, and then drive the movable rod to move. The movement of the movable rod can drive the two fixed sleeves to slide on the support rod and the positioning rod, so that the movable rod The movement of the movable rod is limited, and after the movable rod moves, the reset spring can be deformed by the mounting block, and the movable rod can be driven to move back and forth by the rotation of the cam. After the movable rod moves, the sorting bucket is driven to move back and forth by the fixed rod. While the sorting bucket moves, the sliding block is driven to slide inside the sliding groove by the connecting block, and the telescopic rod and the telescopic spring can be continuously stretched or compressed, thereby supporting the reciprocating movement of the sorting bucket, so that the coarse powder can be filtered out through the filter holes on the sorting bucket. The sorting bucket is tilted, and the filtered impurities can be discharged from the sorting bucket through the reciprocating movement of the sorting bucket. The powder selection component makes it possible to sort the coal mine filling cementitious material particles into fine powder and coarse powder, and can sort out impurities, which is convenient for discharging after sorting and improves practicality.

[0021] 2. A filter assembly is set on one side of the support platform. The fan needs to take in air while it is running. The air intake of the fan can be filtered through the filter on the installation frame to prevent impurities in the air from entering the box. After long-term use, the filter is blocked by impurities. The two sets of positioning sleeves can be pulled to drive the moving rod to slide inside the movable groove, so that the stretching spring can be stretched, thereby separating the limit rod from the limit groove on the installation frame. Moving the limit rod makes the installation frame lose its limit, and the installation frame can be removed for cleaning. When installing the installation frame , fit the installation frame to one side of the air duct, then pull the moving rod to move so that the limit rod is located on one side of the installation frame, then push the limit rod to slide on the positioning sleeve, so that the limit rod is aligned with the limit slot, then release the moving rod and stretch the spring to drive the limit rod to move and engage the limit slot, so that the installation frame is limited, and the stretch spring is in a stretched state, so that the limit rod and the limit slot are not easy to fall off, and the air suction of the fan can be filtered through the filter assembly to prevent impurities from entering the box, and the filter net is easy to disassemble and assemble, so as to facilitate cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the front structure of the utility model;

[0023] Figure 2 This is a front sectional structural schematic diagram of the utility model;

[0024] Figure 3 For this utility model Figure 2 A schematic diagram of the enlarged structure of the middle A area;

[0025] Figure 4 For this utility model Figure 2 Schematic diagram of the enlarged structure of the middle B area;

[0026] Figure 5 For this utility model Figure 2 Schematic diagram of the enlarged structure of the middle C area.

[0027] In the figure: 1. base; 101. column; 102. support platform; 103. air duct; 104. fan; 105. discharge chute; 106. box; 107. feed port; 108. discharge pipe; 109. storage hopper; 2. powder selection assembly; 201. drive motor; 202. rotating shaft; 203. mounting rod; 204. material distribution plate; 205. cam; 206. movable rod; 207. mounting plate; 208. fixing sleeve; 209. support rod; 210 , positioning rod; 211, reset spring; 212, mounting block; 213, sorting bucket; 214, fixing rod; 215, cross bar; 216, connecting block; 217, sliding groove; 218, sliding block; 219, telescopic rod; 220, telescopic spring; 3, filter assembly; 301, mounting frame; 302, filter screen; 303, movable groove; 304, moving rod; 305, positioning sleeve; 306, tension spring; 307, limiting rod; 308, limiting groove. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the implementation regulations described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1-5The utility model provides a technical solution: a coal mine filling cementitious material particle size optimization device, including a base 1, two groups of columns 101 are symmetrically installed on the top of the base 1, and a support platform 102 is fixedly installed on the top of the two groups of columns 101, and an air duct 103 is opened on one side of the interior of the support platform 102, and a fan 104 is fixedly installed on one side of the interior of the air duct 103, and a discharge chute 105 is opened through the top of the support platform 102, and the air duct 103 is connected with the discharge chute 105 through the top, and the air duct 103 is connected with the discharge chute 105 through the top, and also includes: a box body 106 is fixedly installed on the top of the support platform 102, and a feeding port 107 is connected through the top side of the box body 106, and discharge pipes 108 are symmetrically connected on both sides of the box body 106, and a storage hopper 109 is fixedly installed on the top of the box body 106 , and a powder selection component 2 is provided inside the support platform 102 and the box body 106, and a filtering component 3 is provided on one side of the support platform 102, wherein the powder selection component 2 includes a driving motor 201 fixedly installed on the top of the box body 106, and a rotating shaft 202 is fixedly installed on the output end of the driving motor 201, and the rotating shaft 202 is rotatably connected to the box body 106 and the storage hopper 109 through a bearing, wherein a mounting rod 203 is fixedly installed at the lower part of the inside of the box body 106, and the rotating shaft 202 is rotatably connected to the mounting rod 203, and a distributing plate 204 is fixedly installed at the lower part of the outside of the rotating shaft 202, through the powder selection component 2, the coal mine filling cementitious material particles can be sorted into fine powder and coarse powder, and impurities can be sorted out, which is convenient for discharging after sorting and improves practicality.

[0030] A cam 205 is fixedly installed at the bottom of the rotating shaft 202, and a movable rod 206 is arranged at the lower part of the box body 106, and a mounting plate 207 is fixedly installed at the top of the movable rod 206, and the cam 205 is slidably connected to the mounting plate 207, so that the rotation of the cam 205 can drive the mounting plate 207 to move, and a fixed sleeve 208 is symmetrically passed through and fixedly connected above the movable rod 206, and a support rod 209 is slidably connected inside the upper fixed sleeve 208, and the support rod 209 is fixedly connected to the box body 106, and a positioning rod 210 is slidably connected inside the lower fixed sleeve 208, and the positioning rod 210 is fixedly connected to the discharge chute 105, 06 is supported by the movement of the support rod 209, a return spring 211 is sleeved on one side of the outside of the support rod 209, and one side of the return spring 211 is fixedly connected to the upper fixed sleeve 208, and the other end of the return spring 211 is fixedly installed with a mounting block 212, and the mounting block 212 is fixedly connected to the support rod 209, and the bottom of the support platform 102 is located below the discharge trough 105 and a sorting bucket 213 is provided, and a fixed rod 214 is fixedly installed inside the sorting bucket 213, and the fixed rod 214 is fixedly connected to the movable rod 206, and a plurality of filter holes are opened through the bottom of the sorting bucket 213, so that the sorting bucket 213 can move back and forth to sort impurities and coarse powder.

[0031] A cross bar 215 is fixedly installed on one side of the top of the sorting bucket 213, and a connecting block 216 is fixedly connected to the top of the cross bar 215 on the other side of the top of the sorting bucket 213, and sliding grooves 217 are symmetrically opened on both sides of the bottom of the support platform 102, and the sliding groove 217 is internally slidably connected with a sliding block 218, and the two sliding blocks 218 are respectively fixedly connected to the two connecting blocks 216, and a telescopic rod 219 is fixedly installed on one side of the inner part of the sliding groove 217, and a telescopic spring 220 is sleeved on the outer part of the telescopic rod 219, and one end of the telescopic spring 220 is fixedly connected to the sliding groove 217, and the other end of the telescopic rod 219 and the telescopic spring 220 are fixedly connected to the sliding block 218, so as to support the movement of the sorting bucket 213. The filter assembly 3 includes an installation frame 301 arranged on the support platform 102 at one side of the air duct 103, and the inner part of the installation frame 301 A filter screen 302 is fixedly installed on the support platform 102, and two groups of movable grooves 303 are symmetrically opened on both sides of the installation frame 301 inside the support platform 102, and the insides of the two groups of movable grooves 303 are slidably connected with moving rods 304, so that the air intake of the fan 104 can be filtered to prevent impurities in the air from entering the box body 106, and one side of the outer side of the two groups of moving rods 304 is sleeved with a tension spring 306, and one end of the tension spring 306 is fixedly connected to the support platform 102, and the other end of the tension spring 306 is fixedly installed with a positioning sleeve 305, and the positioning sleeve 305 is fixedly connected to the moving rod 304, and the internal sliding connection of the positioning sleeve 305 is a limiting rod 307, and two groups of limiting grooves 308 are symmetrically opened on one side of the installation frame 301, and the limiting rod 307 is snap-connected with the limiting groove 308, which is convenient for disassembly and assembly of the filter screen 302 and cleaning.

[0032] Working principle: Before using the coal mine filling cementitious material particle size optimization device, it is necessary to check the overall condition of the device to ensure that it can work normally. Figure 1 - Figure 5As shown, a powder selection component 2 is arranged inside the support platform 102 and the box body 106. When selecting the material, the fan 104 inside the air duct 103 is started, and the driving motor 201 is started to drive the rotating shaft 202 to rotate, so that the material distribution plate 204 rotates, and the material enters the box body 106 from the feed inlet 107. After that, the wind blown by the fan 104 can enter the box body 106 through the discharge chute 105, and the box body 106 is circulated and blown, and the material enters the storage hopper 1 09, and then falls down, and is divided by the material distribution plate 204. Then, under the action of wind, the fine powder can be discharged through the discharge pipe 108, and then the coarse wind and impurities fall into the discharge trough 105, and fall into the inside of the sorting bucket 213. After the rotation of the rotating shaft 202, the cam 205 is driven to rotate, and the rotation of the cam 205 can push the mounting plate 207 to move, and then drive the movable rod 206 to move. The movement of the movable rod 206 can drive the two fixed sleeves 208 to move on the support rod 209 and the positioning rod 213 respectively. 10 slides on the movable rod 206 to limit the movement of the movable rod 206. After the movable rod 206 moves, the reset spring 211 can be deformed by the mounting block 212. The movable rod 206 can be driven to move back and forth by the rotation of the cam 205. After the movable rod 206 moves, the sorting bucket 213 is driven to move back and forth by the fixed rod 214. While the sorting bucket 213 moves, the sliding block 218 is driven to slide inside the sliding groove 217 by the connecting block 216, and the telescopic rod 219 and the telescopic spring 220 can be continuously stretched or compressed, so as to support the reciprocating movement of the sorting bucket 213, so that the coarse powder can be filtered out through the filter holes on the sorting bucket 213. The sorting bucket 213 is tilted, and the filtered impurities can be discharged from the sorting bucket 213 through the reciprocating movement of the sorting bucket 213. The powder selection component 2 makes it possible to sort the coal mine filling cementitious material particles into fine powder and coarse powder, and to sort out impurities, which is convenient for discharging after sorting and improves practicality.

[0033] A filter assembly 3 is provided on one side of the support platform 102. The fan 104 needs to take in air while it is running. The air intake of the fan 104 can be filtered through the filter screen 302 on the installation frame 301 to prevent impurities in the air from entering the box body 106. After long-term use, the filter screen 302 is blocked by impurities, and the two sets of positioning sleeves 305 can be pulled to drive the moving rod 304 to slide inside the movable groove 303, so that the tension spring 306 can be stretched, thereby disengaging the limiting rod 307 from the limiting groove 308 on the installation frame 301. Moving the limiting rod 307 makes the installation frame 301 lose its limit, and the installation frame 301 can be removed for cleaning. When installing the installation frame 301, the installation The frame 301 is fitted on one side of the air duct 103, and then the moving rod 304 is pulled to move so that the limiting rod 307 is located on one side of the installation frame 301, and then the limiting rod 307 is pushed to slide on the positioning sleeve 305, so that the limiting rod 307 is aligned with the limiting groove 308, and then the moving rod 304 is released and the tension spring 306 drives the limiting rod 307 to move and engage the limiting groove 308, so that the installation frame 301 is limited, and the tension spring 306 is in a stretched state, so that the limiting rod 307 and the limiting groove 308 are not easy to fall off, and the suction of the fan 104 can be filtered through the filter assembly 3 to prevent impurities from entering the box body 106, and it is convenient to disassemble and assemble the filter net 302 for cleaning.

[0034] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for optimizing the particle size of cementitious materials for filling coal mines, comprising a base (1); Two groups of columns (101) are symmetrically mounted on the top of the base (1), and a support platform (102) is fixedly mounted on the top of the two groups of columns (101), and an air duct (103) is opened on one side of the interior of the support platform (102), and a fan (104) is fixedly mounted on one side of the interior of the air duct (103), and a discharge trough (105) is opened through the top of the support platform (102), and the air duct (103) and the discharge trough (105) are connected through and through; It is characterized in that Also includes: A box body (106) is fixedly mounted on the top of the support platform (102), and a feed port (107) is connected through one side of the top of the box body (106), and discharge pipes (108) are symmetrically connected through both sides of the box body (106), and a storage hopper (109) is fixedly mounted on the top of the box body (106), and a powder selection component (2) is disposed inside the support platform (102) and the box body (106), and a filter component (3) is disposed on one side of the support platform (102); The powder selection assembly (2) comprises a driving motor (201) fixedly mounted on the top of the box (106), and a rotating shaft (202) is fixedly mounted on the output end of the driving motor (201), and the rotating shaft (202) is rotatably connected to the box (106) and the storage hopper (109) through a bearing; A mounting rod (203) is fixedly installed at the lower part of the interior of the box body (106), and the rotating shaft (202) is rotatably connected to the mounting rod (203), and a material distribution tray (204) is fixedly installed at the lower part of the exterior of the rotating shaft (202).

2. The device for optimizing the particle size of coal mine filling cementitious materials according to claim 1, characterized in that: A cam (205) is fixedly mounted on the bottom of the rotating shaft (202), a movable rod (206) is arranged at the lower part of the box body (106), a mounting plate (207) is fixedly mounted on the top of the movable rod (206), and the cam (205) is slidably connected to the mounting plate (207).

3. The device for optimizing the particle size of coal mine filling cementitious materials according to claim 2, characterized in that: A fixed sleeve (208) is symmetrically passed through and fixedly connected above the movable rod (206), and a support rod (209) is slidably connected inside the upper fixed sleeve (208), and the support rod (209) is fixedly connected to the box body (106), and a positioning rod (210) is slidably connected inside the lower fixed sleeve (208), and the positioning rod (210) is fixedly connected to the discharge trough (105).

4. The device for optimizing the particle size of coal mine filling cementitious materials according to claim 3, characterized in that: A return spring (211) is sleeved on one side of the outer portion of the support rod (209), and one side of the return spring (211) is fixedly connected to the upper fixed sleeve (208), and a mounting block (212) is fixedly installed on the other end of the return spring (211), and the mounting block (212) is fixedly connected to the support rod (209), and a sorting bucket (213) is provided at the bottom of the support platform (102) below the discharge trough (105), and a fixed rod (214) is fixedly installed inside the sorting bucket (213), and the fixed rod (214) is fixedly connected to the movable rod (206), and a plurality of filter holes are opened through the bottom of the sorting bucket (213).

5. The device for optimizing the particle size of coal mine filling cementitious materials according to claim 4, characterized in that: A cross bar (215) is fixedly installed on one side of the top of the sorting bucket (213), and a connecting block (216) is fixedly connected to the other side of the top of the sorting bucket (213) and the top of the cross bar (215), and sliding grooves (217) are symmetrically provided on both sides of the bottom of the support platform (102), and a sliding block (218) is slidably connected inside the sliding groove (217), and the two sliding blocks (218) are respectively fixedly connected to the two connecting blocks (216), and a telescopic rod (219) is fixedly installed on one side of the inside of the sliding groove (217), and a telescopic spring (220) is sleeved on the outside of the telescopic rod (219), and one end of the telescopic spring (220) is fixedly connected to the sliding groove (217), and the other end of the telescopic rod (219) and the telescopic spring (220) are fixedly connected to the sliding block (218).

6. The device for optimizing the particle size of coal mine filling cementitious materials according to claim 1, characterized in that: The filter assembly (3) comprises a mounting frame (301) arranged on a support platform (102) located on one side of the air duct (103), and a filter screen (302) is fixedly installed inside the mounting frame (301), and two groups of movable grooves (303) are symmetrically opened on both sides of the mounting frame (301) inside the support platform (102), and movable rods (304) are slidably connected inside the two groups of movable grooves (303).

7. The device for optimizing the particle size of coal mine filling cementitious materials according to claim 6, characterized in that: A tension spring (306) is sleeved on one side of the outer portion of the two groups of moving rods (304), and one end of the tension spring (306) is fixedly connected to the support platform (102), and a positioning sleeve (305) is fixedly installed on the other end of the tension spring (306), and the positioning sleeve (305) is fixedly connected to the moving rod (304), and the positioning sleeve (305) is internally slidably connected to a limiting rod (307), and two groups of limiting grooves (308) are symmetrically opened on one side of the installation frame (301), and the limiting rod (307) is snap-fitted and connected to the limiting groove (308).

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