Rapid soil unloading device for rotary excavating drill bit

Abstract

The utility model provides a quick soil unloading device for a rotary excavating drill bit, belongs to the technical field of building construction, and effectively solves the problems that the conventional rotary excavating drill bit is difficult in slag unloading, high in slag unloading noise and the like. According to the technical scheme, the device comprises a soil collecting box, a soil unloading component is arranged on the inner side of the soil collecting box, a lifting rotating mechanism matched with the soil unloading component is arranged at the bottom of the soil collecting box, the soil collecting box is connected with a dust falling component, and a plurality of first universal wheels are arranged at the bottom of the soil collecting box. The quick soil unloading device for the rotary excavating drill bit has the beneficial effects that soil is easy to unload, the noise is low, the manufacturing cost is low, and the construction efficiency can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to a quick soil unloading device for a rotary drilling bit. Background Art

[0002] The construction of urban subways is adjacent to surrounding buildings, and the requirements for noise and dust are extremely high. In the construction of retaining piles and pile foundations, impact drills, rotary drills or down-the-hole hammer drills are usually used according to different geological conditions. Rotary drills have been widely used in pile hole construction in construction projects due to their high efficiency, low pollution and multiple functions, and have become the main machine type in cast-in-place concrete pile construction. The rotary drill has low hole resistance and fast penetration speed in soil strata or soil-rock mixed strata, but there is a common problem of difficulty in unloading slag from the drill bit, which seriously affects the construction speed.

[0003] The common construction methods for drilling bit unloading soil are to throw the drill bit or install a squeezing bulldozer on the drill bit. Throwing the drill bit will generate huge noise during the soil throwing process, which cannot meet the construction noise control requirements and cannot be carried out at night. The squeezing bulldozer is easy to be damaged during the drilling process of the drill bit, consumes oil, and needs to be reinstalled when the drill bit is replaced, which increases the construction cost.

[0004] Therefore how to solve the above-mentioned technical problems just becomes the problem that the utility model faces. Utility Model Content

[0005] In order to solve the deficiencies of the prior art, the utility model provides a rotary drill bit quick soil unloading device which is easy to discharge soil, has low noise, and has low manufacturing cost and can effectively improve construction efficiency.

[0006] The technical solution adopted by the utility model to solve the technical problem is as follows: the utility model provides a rotary drilling bit quick soil unloading device, comprising a soil collecting box, a soil unloading component is arranged inside the soil collecting box, and a lifting and rotating mechanism cooperating with the soil unloading component is arranged at the bottom of the soil collecting box;

[0007] The soil collecting box is connected with a dust suppression component, and a plurality of first universal wheels are arranged at the bottom of the soil collecting box.

[0008] The soil collecting box comprises a horizontally arranged rectangular bottom plate, the edges of the top of the bottom plate are sequentially fixedly connected with vertically arranged enclosure plates, and the first universal wheel is fixedly connected to the bottom of the bottom plate;

[0009] The outer side of the enclosure and the bottom of the base plate are both provided with reinforcing ribs;

[0010] A through mounting hole is provided in the center of the base plate, a rectangular mounting plate is provided at the center of the top of the base plate, a through hole matching the mounting hole is provided in the center of the mounting plate, and nuts are fixedly connected between the four corners of the mounting plate and the base plate.

[0011] The soil unloading component comprises a rectangular fixing plate arranged above the mounting plate, the fixing plate is provided with a docking hole with the same diameter as the through hole, a vertically arranged mounting tube is fixedly connected to the top of the fixing plate, the inner diameter of the mounting tube is the same as the docking hole, a rotating shaft is rotatably connected to the upper inner side of the mounting tube, a rotating cylinder with an open top is coaxially fixedly connected to the top of the rotating shaft, a telescopic rod is threadedly connected to the inner side of the rotating cylinder, and a discharging head is fixedly connected to the top of the telescopic rod;

[0012] The outer wall of the installation tube is symmetrically and vertically provided with limiting grooves on both sides, and the bottom of the discharge head is symmetrically and vertically provided with two limiting rods on both sides, and the limiting rods are slidably matched with the limiting grooves on the same side;

[0013] A plurality of reinforcing plates are evenly fixedly connected between the outer wall of the bottom side of the mounting tube and the fixing plate along the circumferential direction;

[0014] A connecting shaft arranged vertically downward is coaxially fixedly connected to the bottom of the rotating shaft, and a plurality of upper clamping strips are evenly fixedly connected to the outer wall of the connecting shaft along its radial direction.

[0015] The lifting and rotating mechanism comprises mounting blocks fixedly connected to the center of the outer wall of the enclosure on the front and rear sides, each mounting block is fixedly connected to a telescopic oil cylinder arranged vertically downward at the bottom, the telescopic ends of the telescopic oil cylinders on both sides are respectively fixedly connected to the two sides of the lifting plate, and a lifting column arranged vertically upward is fixedly connected to the center of the top of the lifting plate, and the diameter of the lifting column matches the diameter of the mounting hole;

[0016] The inner side of the lifting column is rotatably connected with a rotating column, the top surface of the rotating column is coplanar with the top surface of the lifting column, the bottom of the rotating column extends to the bottom of the lifting plate, the outer side of the bottom of the rotating column is coaxially sleeved with a first transmission disc, the top of one end of the lifting plate is provided with a rotating motor, the output end of the rotating motor is coaxially fixedly connected with a rotating rod rotatably connected to the lifting plate, the outer side of the bottom end of the rotating rod is coaxially sleeved with a second transmission disc, and a transmission belt is sleeved between the second transmission disc and the first transmission disc;

[0017] A connecting hole is coaxially opened from top to bottom on the top of the rotating column, a sliding column is slidably connected to the inner side of the connecting hole, a spring is fixedly connected between the bottom of the sliding column and the bottom of the connecting hole, a plurality of card grooves are evenly and vertically opened on the inner wall of the connecting hole along its circumferential direction, a plurality of lower card strips slidably matched with the card grooves are evenly and fixedly connected to the outer wall of the sliding column, and the upper card strips correspond to the card grooves and slidably match with them.

[0018] The dust suppression component includes a carrier plate fixedly connected to one side of the bottom plate in a horizontal direction, a water tank is arranged above the carrier plate, a water inlet is arranged on the top of the water tank, a water outlet at the bottom of the water tank is connected to the input end of a water pump, an output end of the water pump is connected to a water outlet pipe, the water outlet pipe is extended to the top of the enclosures on the front and rear sides through a tee, a plurality of sprinkler heads are evenly arranged on the water outlet pipe located above the enclosure, and a plurality of supports are arranged between the water outlet pipe located above the enclosure and the enclosure;

[0019] Two second universal wheels are symmetrically arranged on both sides of the bottom of the carrier plate.

[0020] The discharge head includes a rectangular connecting plate, a rectangular groove is opened from bottom to top at the center of the bottom of the connecting plate, the inner wall of the groove is in contact with and fixedly connected to the outer wall at the center of the top of the telescopic rod, and an isosceles triangle-shaped top plate is fixedly connected to the top of the connecting plate, the bottom edge of the top plate is the same length as the top edge of the connecting plate, and a number of conical blocks with their tips facing outwards are evenly arranged on the oblique edges on both sides of the top plate.

[0021] When the utility model is actually used: the device is moved to the construction site as a whole, the soil unloading component is docked with the lifting and rotating mechanism, the telescopic oil cylinder is first started to retract, driving the lifting column to rise, and inserted from the mounting hole to the top of the bottom plate, and then the bottom of the mounting tube is inserted into the outside of the lifting column, so as to fix the soil unloading component. At the same time, when the lifting column rises, the sliding column is pressed downward by the connecting shaft, and the upper clamping strip and the clamping groove form a clamping connection, the rotary drilling drill bit rotates in the pile hole to take soil, and after the drilling and taking of soil is completed, it is reversed and lifted up, and moved to the soil collecting box. The drill bit is aligned with the unloading head and rotates and falls. Under the action of the unloading head, the soil in the drill bit barrel is unloaded into the soil collecting box. As the soil in the soil collecting box gradually increases, Start the rotating motor, which drives the rotating drum to rotate, so that the telescopic rod threadedly connected to it drives the unloading head to extend upward. Due to the action of the limit rod and the limit groove, the telescopic rod is limited to rotate with the rotating drum and can be smoothly lifted and lowered. When the soil in the soil collecting box is almost full, the telescopic cylinder drives the lifting column to move down and separate from the mounting tube. During the downward movement, the top surface of the sliding column is coplanar with the top surface of the rotating column and the top surface of the mounting plate under the action of the spring to prevent the debris from falling in. Then the unloading parts can be pulled out by lifting equipment, and the soil in the box can be transported out by using an excavator and a dump truck. During the unloading process, the spray heads can spray from both sides of the top of the soil collecting box to effectively control dust.

[0022] The beneficial effects of the utility model are:

[0023] 1. The utility model can effectively solve the problems of difficult soil discharge, high noise and high cost in traditional drill construction, and improve construction efficiency;

[0024] 2. Universal wheels are arranged around the bottom of the soil collecting box of the utility model to facilitate movement, and spray devices are arranged around the top to reduce dust pollution. The lifting and rotating mechanism can make the soil unloading parts quickly and stably installed and quickly pulled out;

[0025] 3. The utility model can adjust the height of the discharge head within a certain range through the lifting and rotating mechanism, thereby avoiding the problem of low soil discharge efficiency caused by the accumulation of soil in the box body and ensuring the deep cutting depth of the rotary drilling bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the front view of the utility model;

[0027] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model from a first angle;

[0028] Figure 3 for Figure 2 A magnified schematic diagram of area A;

[0029] Figure 4 This is a schematic diagram of the three-dimensional structure of the utility model from a second angle;

[0030] Figure 5 for Figure 4 A magnified schematic diagram of area B;

[0031] Figure 6 This is a structural diagram of the utility model at a first angle in which the soil unloading component and the lifting and rotating mechanism are separated;

[0032] Figure 7 for Figure 6 A magnified schematic diagram of region C;

[0033] Figure 8 This is a second angle structural diagram of the utility model in which the soil unloading component and the lifting and rotating mechanism are separated;

[0034] Fig. 9 This is a structural diagram of the utility model when the sliding column and the rotating column are separated.

[0035] Wherein, the accompanying drawings are marked as follows:

[0036] 1. Soil collecting box; 101. Bottom plate; 102. Enclosure; 103. Reinforcement ribs; 104. Mounting holes; 105.

[0037] Mounting plate; 106, through hole; 107, bolt nut; 2, soil unloading parts; 201, fixing plate; 203, mounting pipe; 204, rotating shaft; 205, rotating cylinder; 206, telescopic rod; 207, unloading head; 2071, connecting plate; 2072, top plate; 2073, conical block; 208, limiting groove; 209, limiting rod; 210, reinforcing plate; 211, connecting shaft; 212, upper clamping strip; 3, lifting and rotating mechanism; 301, mounting block; 302, telescopic cylinder; 303, lifting plate; 304, Lifting column; 305, rotating column; 306, first transmission plate; 307, rotating motor; 308, rotating rod; 309, second transmission plate; 310, transmission belt; 311, connecting hole; 312, sliding column; 313, spring; 314, card slot; 315, lower card strip; 4, dust suppression component; 401, carrier plate; 402, water tank; 403, water inlet; 404, water pump; 405, water outlet pipe; 406, tee; 407, sprinkler head; 408, support; 409, second universal wheel; 5, first universal wheel. DETAILED DESCRIPTION

[0038] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0039] See also Figures 1 to 9 As shown, the utility model is a quick soil unloading device for a rotary drilling bit, comprising a soil collecting box 1, a soil unloading component 2 is arranged inside the soil collecting box 1, a lifting and rotating mechanism 3 cooperating with the soil unloading component 2 is arranged at the bottom of the soil collecting box 1, the soil collecting box 1 is connected to a dust reduction component 4, and a plurality of first universal wheels 5 are arranged at the bottom of the soil collecting box 1.

[0040] The soil collecting box 1 includes a horizontally arranged rectangular base plate 101, and vertically arranged enclosures 102 are sequentially fixedly connected to the edges of the top of the base plate 101. The first universal wheel 5 is fixedly connected to the bottom of the base plate 101. The outer side of the enclosure 102 and the bottom of the base plate 101 are provided with reinforcing ribs 103. A penetrating mounting hole 104 is opened in the center of the base plate 101. A rectangular mounting plate 105 is arranged at the center of the top of the base plate 101. A through hole 106 cooperating with the mounting hole 104 is opened in the center of the mounting plate 105. Bolt nuts 107 are fixedly connected between the four corners of the mounting plate 105 and the base plate 101. The dust reduction component 4 includes a carrier plate 401 fixedly connected horizontally to one side of the bottom plate 101, a water tank 402 is arranged above the carrier plate 401, a water inlet 403 is arranged on the top of the water tank 402, the water outlet at the bottom of the water tank 402 is connected to the input end of the water pump 404, the output end of the water pump 404 is connected to the outlet pipe 405, the outlet pipe 405 extends to the top of the front and rear sides of the enclosure 102 through the tee 406 respectively, the outlet pipe 405 located above the enclosure 102 is evenly provided with a plurality of sprinkler heads 407, a plurality of supports 408 are arranged between the outlet pipe 405 located above the enclosure 102 and the enclosure 102, and two second universal wheels 409 are symmetrically arranged on both sides of the bottom of the carrier plate 401.

[0041] The soil unloading component 2 includes a rectangular fixing plate 201 arranged above the mounting plate 105, the fixing plate 201 is provided with a docking hole with the same diameter as the through hole 106, a vertically arranged mounting tube 203 is fixedly connected to the top of the fixing plate 201, the inner diameter of the mounting tube 203 is the same as the docking hole, a rotating shaft 204 is rotatably connected to the upper side of the inner part of the mounting tube 203, a rotating cylinder 205 with an open top is coaxially fixedly connected to the top of the rotating shaft 204, a telescopic rod 206 is threadedly connected to the inner side of the rotating cylinder 205, and a top of the telescopic rod 206 is fixedly connected to the unloading The material head 207 and the mounting tube 203 have limit grooves 208 symmetrically and vertically arranged on both sides of the outer wall. Two limit rods 209 are symmetrically and vertically arranged downwardly on both sides of the bottom of the discharge head 207. The limit rods 209 are slidably matched with the limit grooves 208 located on the same side. A plurality of reinforcing plates 210 are evenly fixedly connected along the circumferential direction between the outer wall of the bottom side of the mounting tube 203 and the fixed plate 201. A connecting shaft 211 arranged vertically downward is coaxially fixedly connected to the bottom of the rotating shaft 204. A plurality of upper clamping strips 212 are evenly fixedly connected to the outer wall of the connecting shaft 211 along its radial direction. The dust reduction component 4 includes a carrier plate 401 fixedly connected horizontally to one side of the bottom plate 101, a water tank 402 is arranged above the carrier plate 401, a water inlet 403 is arranged on the top of the water tank 402, the water outlet at the bottom of the water tank 402 is connected to the input end of the water pump 404, the output end of the water pump 404 is connected to the outlet pipe 405, the outlet pipe 405 extends to the top of the front and rear sides of the enclosure 102 through the tee 406 respectively, the outlet pipe 405 located above the enclosure 102 is evenly provided with a plurality of sprinkler heads 407, a plurality of supports 408 are arranged between the outlet pipe 405 located above the enclosure 102 and the enclosure 102, and two second universal wheels 409 are symmetrically arranged on both sides of the bottom of the carrier plate 401.

[0042] The lifting and rotating mechanism 3 includes a mounting block 301 fixedly connected to the center of the outer wall of the front and rear side panels 102, and each mounting block 301 is fixedly connected to a telescopic cylinder 302 arranged vertically downward at the bottom, and the telescopic ends of the telescopic cylinders 302 on both sides are respectively fixedly connected to the two sides of the lifting plate 303, and a lifting column 304 arranged vertically upward is fixedly connected to the center of the top of the lifting plate 303. The diameter of the lifting column 304 matches the diameter of the mounting hole 104, and a rotating column 305 is rotatably connected to the inner side of the lifting column 304. The top surface of the rotating column 305 is coplanar with the top surface of the lifting column 304, and the bottom of the rotating column 305 extends to the bottom of the lifting plate 303. The first transmission plate 306 is coaxially sleeved on the outer side of the bottom of the rotating column 305, and a rotating The motor 307, the output end of the rotating motor 307 is coaxially fixedly connected with the rotating rod 308 which is rotatably connected to the lifting plate 303, the second transmission disk 309 is coaxially sleeved on the outer side of the bottom end of the rotating rod 308, a transmission belt 310 is sleeved between the second transmission disk 309 and the first transmission disk 306, a connecting hole 311 is coaxially opened on the top of the rotating column 305 from top to bottom, a sliding column 312 is slidably connected to the inner side of the connecting hole 311, a spring 313 is fixedly connected between the bottom of the sliding column 312 and the bottom of the connecting hole 311, a plurality of card grooves 314 are evenly and vertically opened on the inner wall of the connecting hole 311 along its circumferential direction, a plurality of lower card strips 315 which are slidably matched with the card grooves 314 are evenly and fixedly connected to the outer wall of the sliding column 312, and the upper card strip 212 corresponds to the card groove 314 and is slidably matched.

[0043] In actual use: the device is moved to the construction site as a whole, and the soil unloading component 2 is docked with the lifting and rotating mechanism 3. First, the telescopic cylinder 302 is started to retract, driving the lifting column 304 to rise, and inserted from the mounting hole 104 to the top of the bottom plate 101, and then the bottom of the mounting tube 203 is inserted into the outside of the lifting column 304, so as to fix the soil unloading component 2. At the same time, when the lifting column 304 rises, the sliding column 312 is pressed downward by the connecting shaft 211, and the upper clamping strip 212 is clamped with the clamping groove 314, and the rotary drill bit rotates in the pile hole to take soil. After drilling and taking soil, it is reversed and lifted up, and moved to the soil collecting box 1. The drill bit is aligned with the discharge head 207 and rotates and falls. Under the action of the discharge head 207, the soil in the drill bit barrel is unloaded into the soil collecting box 1. As the soil in the soil collecting box gradually increases, the start The rotating motor 307 drives the rotating cylinder 205 to rotate, so that the telescopic rod 206 threadedly connected thereto drives the unloading head 207 to extend upward. Due to the action of the limit rod 209 and the limit groove 208, the telescopic rod 206 is limited to rotate with the rotating cylinder 206 and can be smoothly lifted and lowered. When the soil in the soil collecting box 1 is almost full, the telescopic cylinder 302 drives the lifting column 304 to move downward and separate from the mounting tube. During the downward movement, under the action of the spring 313, the top surface of the sliding column 312 is coplanar with the top surface of the rotating column 305 and the top surface of the mounting plate 105 again. Then, the unloading component can be pulled out by the lifting equipment, and then the excavator and the muck truck can be used to transport the soil in the box. During the unloading process, the spray head 407 can spray from both sides of the top of the soil collecting box 1 to effectively control dust.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rapid soil unloading device for a rotary drilling bit, characterized in that: It comprises a soil collecting box (1), a soil unloading component (2) is arranged inside the soil collecting box (1), and a lifting and rotating mechanism (3) cooperating with the soil unloading component (2) is arranged at the bottom of the soil collecting box (1); The soil collecting box (1) is connected to a dust suppression component (4), and a plurality of first universal wheels (5) are arranged at the bottom of the soil collecting box (1); The soil collecting box (1) comprises a horizontally arranged rectangular bottom plate (101), the top of the bottom plate (101) is sequentially fixedly connected with vertically arranged enclosure plates (102) at the edges around the top, and the first universal wheel (5) is fixedly connected to the bottom of the bottom plate (101); The outer side of the enclosure plate (102) and the bottom of the bottom plate (101) are both provided with reinforcing ribs (103); A through mounting hole (104) is provided at the center of the bottom plate (101); a rectangular mounting plate (105) is provided at the center of the top of the bottom plate (101); a through hole (106) matching the mounting hole (104) is provided at the center of the mounting plate (105); and bolt nuts (107) are fixedly connected between the four corners of the mounting plate (105) and the bottom plate (101); The soil unloading component (2) comprises a rectangular fixing plate (201) arranged above the mounting plate (105), the fixing plate (201) is provided with a docking hole having the same diameter as the through hole (106), a vertically arranged mounting tube (203) is fixedly connected to the top of the fixing plate (201), the inner diameter of the mounting tube (203) is the same as the docking hole, a rotating shaft (204) is rotatably connected to the upper side of the interior of the mounting tube (203), a rotating cylinder (205) having an open top is coaxially fixedly connected to the top of the rotating shaft (204), a telescopic rod (206) is threadedly connected to the inner side of the rotating cylinder (205), and a discharging head (207) is fixedly connected to the top of the telescopic rod (206); The outer wall of the installation tube (203) is symmetrically and vertically provided with limiting grooves (208), and the bottom of the discharge head (207) is symmetrically and vertically provided with two limiting rods (209) facing downward, and the limiting rods (209) are slidably matched with the limiting grooves (208) located on the same side; A plurality of reinforcing plates (210) are evenly fixedly connected between the outer wall of the bottom side of the mounting tube (203) and the fixing plate (201) along the circumferential direction; The bottom of the rotating shaft (204) is coaxially fixedly connected with a connecting shaft (211) arranged vertically downward, and the outer wall of the connecting shaft (211) is evenly fixedly connected with a plurality of upper clamping strips (212) along its radial direction.

2. The rotary drilling bit quick soil unloading device according to claim 1 is characterized in that: The lifting and rotating mechanism (3) comprises a mounting block (301) fixedly connected to the center of the outer wall of the enclosure (102) on the front and rear sides, and a telescopic oil cylinder (302) vertically arranged downward is fixedly connected to the bottom of each mounting block (301), and the telescopic ends of the telescopic oil cylinders (302) on both sides are respectively fixedly connected to the two sides of the lifting plate (303), and a lifting column (304) vertically arranged upward is fixedly connected to the center of the top of the lifting plate (303), and the diameter of the lifting column (304) matches the diameter of the mounting hole (104); The inner side of the lifting column (304) is rotatably connected with a rotating column (305), the top surface of the rotating column (305) is coplanar with the top surface of the lifting column (304), the bottom of the rotating column (305) extends to the bottom of the lifting plate (303), the outer side of the bottom of the rotating column (305) is coaxially sleeved with a first transmission disc (306), the top of one end of the lifting plate (303) is provided with a rotating motor (307), the output end of the rotating motor (307) is coaxially fixedly connected with a rotating rod (308) rotatably connected to the lifting plate (303), the outer side of the bottom end of the rotating rod (308) is coaxially sleeved with a second transmission disc (309), and a transmission belt (310) is sleeved between the second transmission disc (309) and the first transmission disc (306); A connecting hole (311) is coaxially opened on the top of the rotating column (305) from top to bottom, a sliding column (312) is slidably connected to the inside of the connecting hole (311), a spring (313) is fixedly connected between the bottom of the sliding column (312) and the bottom of the connecting hole (311), a plurality of slots (314) are evenly and vertically opened on the inner wall of the connecting hole (311) along its circumferential direction, a plurality of lower clips (315) slidably matched with the clips (314) are evenly and fixedly connected to the outer wall of the sliding column (312), and the upper clips (212) correspond to and slidably match with the clips (314).

3. The rotary drilling bit quick soil unloading device according to claim 1, characterized in that: The dust suppression component (4) comprises a carrier plate (401) fixedly connected to one side of the bottom plate (101) in a horizontal manner, a water tank (402) is arranged above the carrier plate (401), a water inlet (403) is arranged at the top of the water tank (402), a water outlet at the bottom of the water tank (402) is connected to the input end of a water pump (404), an output end of the water pump (404) is connected to a water outlet pipe (405), the water outlet pipe (405) extends to the top of the enclosure (102) on the front and rear sides respectively through a tee (406), a plurality of spray heads (407) are evenly arranged on the water outlet pipe (405) located above the enclosure (102), and a plurality of supports (408) are arranged between the water outlet pipe (405) located above the enclosure (102) and the enclosure (102); Two second universal wheels (409) are symmetrically arranged on both sides of the bottom of the carrier plate (401).

4. The rotary drilling bit quick soil unloading device according to claim 1, characterized in that: The discharge head (207) comprises a rectangular connecting plate (2071), a rectangular groove is provided at the bottom center of the connecting plate (2071) from bottom to top, the inner wall of the groove is in contact with and fixedly connected to the outer wall at the top center of the telescopic rod (206), an isosceles triangle-shaped top plate (2072) is fixedly connected to the top of the connecting plate (2071), the bottom edge of the top plate (2072) is the same length as the top edge of the connecting plate (2071), and a plurality of conical blocks (2073) with their tips facing outwards are evenly arranged on the oblique edges on both sides of the top plate (2072).

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