Bottom expanding and slag removing drill bit and bottom expanding and slag removing method thereof

Abstract

The invention relates to the technical field of drill bit drilling, in particular to a bottom expanding and slag removing drill bit and a bottom expanding and slag removing method thereof.The drill bit comprises a fixing body, a slag removing barrel, an upper expanding arm, a lower expanding arm, expanding connecting plates and a guide column, and the lower end of the fixing body is connected with at least two sets of expanding connecting plates in the circumferential direction; each group of expansion connecting plates is provided with two parallel connecting plates, an expansion gap is formed between the two parallel connecting plates, the upper end of an expansion upper arm is inserted into an expansion gap opening and is hinged to the connecting plates, the lower end of the expansion upper arm is hinged to the upper end of an expansion lower arm, and the lower end of the expansion lower arm is hinged to the upper end of a slag removal cylinder; the upper end of the slag removal cylinder is connected with a guide column through a support, the lower end of the guide column is fixedly connected with the slag removal cylinder, the upper end of the guide column penetrates through the middle of the expansion connecting plate and then is inserted into a guide hole in the middle of the fixing body, and a discharging cover is installed at the lower end of the slag removal cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of drill bit drilling, in particular to a bottom enlarging and slag cleaning drill bit with simple structure, good drilling effect, good slag cleaning effect and guaranteed bonding strength between pile body and ground and a bottom enlarging and slag cleaning method thereof. Background Art

[0002] As we all know, the enlarged base pile is a cast-in-place column with a pile bottom diameter larger than the upper pile body diameter. The bearing capacity of a single pile is greatly improved compared to the bearing capacity of the pile body diameter. Drilled enlarged base cast-in-place piles are a relatively new construction method and an improvement and innovation of bored cast-in-place piles. After the drilling reaches the required bearing layer, a special drill bit is used at the pile end to enlarge the diameter of the pile end, thereby significantly increasing the ultimate bearing capacity of the pile compared to the ultimate bearing capacity of cast-in-place piles without an enlarged head.

[0003] At present, the existing expanded bottom piles generally have the function of expanding the hole diameter. Since the bottom of the expanded bottom pile generally requires a fixed limiting sleeve to position the expanded part of the expanded bottom pile, there will be debris at the bottom of the expanded hole of the expanded bottom pile. When the pile body is combined with the ground, the debris at the bottom of the pile hole causes the bottom of the pile body to be loosely combined with the ground, and the connection strength is low. Summary of the Invention

[0004] The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art and to provide a bottom enlarging and slag cleaning drill bit and a bottom enlarging and slag cleaning method thereof which have a simple structure, good drilling effect, good slag cleaning effect, and ensure the bonding strength between the pile body and the ground.

[0005] The technical solution adopted by the present invention to solve its technical problem is: The lifting of the ... The extended upper arm described in the present invention is L-shaped, the upper end of the long arm portion of the L-shaped extended upper arm is hinged to the connecting plate, the corner position of the L-shaped extended arm is hinged to the upper end of the extended lower arm via the pin shaft, and the outer side of the L-shaped extended arm is evenly connected to the drill head inclined toward the side.

[0006] The mounting cover of the present invention is connected to the slag cleaning barrel through the cover opening assembly, and the cover opening assembly includes a positioning rod, a pressing rod, a linkage rod, a pressing hook, a lower positioning block, and an upper positioning block. The upper end of the positioning rod passes through the positioning hole provided on the fixed body, and the lower end of the positioning rod is connected to the upper positioning block. The lower end of the upper positioning block is connected to the pressing rod. The lower end of the pressing rod passes through the through hole of the lower positioning block on the slag cleaning barrel and is hinged to the upper end of the linkage rod. A connecting ear plate is provided on the inner wall of the slag cleaning barrel. The lower end is hinged to the upper end of the pressing hook, the middle part of the pressing hook is hinged to the connecting ear plate through a pin shaft, a reset spring is sleeved on the outside of the pressing rod between the upper positioning block and the lower positioning block, and a reset hole is provided on the side wall of the slag cleaning barrel. The hook head of the pressing hook is inserted in the reset hole position, and the unloading cover is hinged to the slag cleaning barrel through the hinge shaft. By pressing the positioning rod, the positioning rod presses the pressing rod and the linkage rod, and then presses the pressing hook, driving the pressing hook to rotate, and the unloading cover is separated from the pressing hook and then the unloading cover is opened for unloading.

[0007] An external socket is provided above the middle of the extended connecting plate described in the present invention, and an internal socket that cooperates with the external socket is provided at the upper end of the guide column. The pin passes through the external socket and the internal socket to realize the positioning of the extended connecting plate and the guide column, so that the extended upper arm and the extended lower arm are in an expanded state, which is convenient for pressing the upper end of the positioning rod.

[0008] The rear end of the fixed body described in the present invention is connected to the end telescopic arm, and the lower end of the head telescopic arm or the outer side of the crane is fixedly connected to the pressing plate. The end telescopic arm is lifted up to drive the fixed body to move upward, and the pressing rod on the fixed body is squeezed by the pressing plate, thereby opening the unloading cover.

[0009] The unloading cover described in the present invention wraps the fixed cover and the rotating cover, the fixed cover is arranged at the top, and the rotating cover is arranged at the bottom, the middle part of the fixed cover is hinged to the rotating cover through the pin shaft, and one side of the fixed cover is hinged to the slag cleaning barrel through the hinge shaft, and a mouth-shaped buckle is provided above the other side of the fixed cover, and the hook head of the pressing hook is hooked inside the mouth-shaped buckle. The fixed cover is provided with an upper slag inlet, and the rotating cover is provided with a lower slag inlet that cooperates with the fixed cover. The slag is fed when the rotating cover is rotated to the position where the lower slag inlet corresponds to the upper slag inlet and is connected. The rotating cover is lifted to unload the slag when the upper slag inlet and the lower slag inlet are closed.

[0010] The present invention provides two upper slag inlets, which are symmetrical and fan-shaped. The lower slag inlets are provided with two to cooperate with the upper slag inlets. The fixed cover on the side of the upper slag inlet is provided with a stop-rotation protrusion. The stop-rotation protrusion is fixed on the same side of each upper slag inlet, and the stop-rotation protrusions are symmetrical about the center.

[0011] A bottom enlarging and slag cleaning method for a bottom enlarging and slag cleaning drill bit, characterized in that the bottom enlarging and slag cleaning method comprises the following steps: (1) Installation of bottom expansion and slag removal drill bit: install the upper end of the fixed body on the end telescopic arm, and fix the head telescopic arm on the crane; (2) Bottom expansion and slag cleaning: The crane moves the bottom expansion and slag cleaning drill bit to the top of the drilled straight hole, starts the crane, extends the end telescopic arm, and drives the bottom expansion and slag cleaning drill bit to the bottom of the straight hole. After reaching the bottom, the telescopic arm rotates, and while the telescopic arm rotates, it presses the fixed body downward, and the guide column under the fixed body gradually inserts into the middle of the expansion connecting plate and inserts into the guide hole of the fixed body. In the process, the upper and lower extension arms are unfolded to realize the hole expansion action. During the hole expansion, the slag enters the slag cleaning barrel through the slag inlet hole at the upper end of the slag cleaning barrel, and the slag at the bottom of the slag cleaning barrel enters the interior of the slag cleaning barrel through the upper and lower slag inlets on the fixed cover and the rotating cover. After the hole expansion is completed, the telescopic arm is rotated in the opposite direction. At this time, the rotating cover rotates under the action of the friction force at the bottom of the straight hole, and rotates until the lower slag inlet of the rotating cover and the upper slag inlet of the fixed cover are closed. At this time, the telescopic arm is lifted. The upper and lower arms are extended and retracted, and the bottom-enlarging slag cleaning drill bit is lifted and directly disengaged from the straight hole. After the bottom-enlarging slag cleaning drill bit is lifted and straight to the ground, the bottom-enlarging slag cleaning drill bit is placed above the ground and the fixed body is continued to be pressed down. At this time, the upper and lower arms are extended until the outer sockets on the extension connecting plate correspond to the inner sockets of the guide column, and then the pins are passed through the outer sockets and the inner sockets. At this time, the bottom-enlarging slag cleaning drill bit is always in the extended state, and the end telescopic arm is lifted again. During the upward movement of the end telescopic arm, the upper end of the positioning rod contacts the pressing plate. After continuing to lift, the pressing plate presses the positioning rod, and then the crane lifts the bottom-enlarging slag cleaning drill bit as a whole. At this time, the fixed cover and the rotating cover are opened, and the slag in the slag cleaning barrel is unloaded, completing the hole enlarging and slag cleaning process. After that, the bottom-enlarging slag cleaning drill bit is pressed down again, and the fixed cover and the rotating cover are closed and the lower end of the slag cleaning barrel is removed, and the next bottom enlarging and slag cleaning process is carried out.

[0012] Due to the adoption of the above structure, the present invention has the advantages of simple structure, good drilling effect, good slag cleaning effect, and guaranteed bonding strength between the pile body and the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention.

[0014] Figure 2 yes Figure 1 Schematic diagram of the expanded structure of the middle extended upper arm and the extended lower arm.

[0015] Figure 3 yes Figure 1 A partial enlarged view of the middle slag cleaning barrel.

[0016] Figure 4 yes Figure 1 Bottom view of the fixed cover and rotating cover.

[0017] Figure 5 yes Figure 4 Schematic diagram of the structure of the fixed cover.

[0018] Figure 6 yes Figure 4 Schematic diagram of the structure of the rotating cover. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings: As shown in the accompanying drawings, a bottom-expanded slag cleaning drill bit comprises a fixed body 1, a slag cleaning barrel 2, an extended upper arm 3, an extended lower arm 4, an extended connecting plate 5, and a guide column 6, characterized in that the lower end of the fixed body 1 is connected to at least two groups of extended connecting plates 5 in the circumferential direction, each group of extended connecting plates 5 is provided with two parallel connecting plates, and an extended gap is set between the two parallel connecting plates, the upper end of the extended upper arm 3 is inserted into the extended gap mouth and hinged with the connecting plate, the lower end of the extended upper arm 3 is hinged to the upper end of the extended lower arm 4, and the lower end of the extended lower arm 4 is hinged to the upper end of the slag cleaning barrel 2, the upper end of the slag cleaning barrel 2 is connected to the guide column 6 via the bracket, and the lower end of the guide column 6 is fixedly connected to the slag cleaning barrel 2, the upper end of the guide column 6 passes through the middle of the extended connecting plate 5 and is inserted into the guide hole in the middle of the fixed body 1, the upper end of the slag cleaning barrel 2 is provided with a slag inlet hole, and the lower end of the slag cleaning barrel 2 is installed with a unloading cover. Furthermore, the extended upper arm 3 is L-shaped, the upper end of the long arm portion of the L-shaped extended upper arm 3 is hinged to the connecting plate, the corner position of the L-shaped extended arm is hinged to the upper end of the extended lower arm 4 via the pin shaft, and the outer side of the L-shaped extended arm is evenly connected to the drill head 7 tilted toward the side.

[0020] Furthermore, the mounting cover is connected to the slag cleaning barrel 2 through the cover opening assembly, and the cover opening assembly includes a positioning rod 8, a pressing rod 9, a linkage rod 14, a pressing hook 10, a lower positioning block 11, and an upper positioning block 12. The upper end of the positioning rod 8 passes through the positioning hole provided on the fixed body 1, and the lower end of the positioning rod 8 is connected to the upper positioning block 12. The lower end of the upper positioning block 12 is connected to the pressing rod 9. The lower end of the pressing rod 9 passes through the through hole of the lower positioning block 11 on the slag cleaning barrel 2 and is hinged to the upper end of the linkage rod 14. A connecting ear plate 15 is provided on the inner wall of the slag cleaning barrel 2, and the lower end of the linkage rod 14 is hinged to the upper end of the linkage rod 14. The end is hinged to the upper end of the pressing hook 10, the middle part of the pressing hook 10 is hinged to the connecting ear plate 15 through a pin shaft, and a reset spring 13 is sleeved on the outside of the pressing rod 9 between the upper positioning block 12 and the lower positioning block 11. A reset hole 16 is provided on the side wall of the slag cleaning cylinder 2. The hook head of the pressing hook 10 is inserted in the reset hole 16 position, and the unloading cover is hinged to the slag cleaning cylinder 2 through the hinge shaft. By pressing the positioning rod 8, the positioning rod 8 presses the pressing rod 9 and the linkage rod 14, and then presses the pressing hook 10, driving the pressing hook 10 to rotate, and the unloading cover is separated from the pressing hook 10 and then the unloading cover is opened for unloading.

[0021] Furthermore, an external socket 17 is provided above the middle of the extended connecting plate 5, and an internal socket that cooperates with the external socket 17 is provided at the upper end of the guide column 6. The pin passes through the external socket 17 and the internal socket to realize the positioning of the extended connecting plate 5 and the guide column 6, so that the extended upper arm 3 and the extended lower arm 4 are in an expanded state, which is convenient for pressing the upper end of the positioning rod 8.

[0022] Furthermore, the rear end of the fixed body 1 is connected to the end telescopic arm, and the lower end of the head telescopic arm or the outside of the crane is fixedly connected to the pressing plate. The end telescopic arm is lifted up to drive the fixed body 1 to move upward, and the pressing rod 9 on the fixed body 1 is squeezed by the pressing plate, thereby opening the unloading cover.

[0023] Furthermore, the unloading cover wraps the fixed cover 18 and the rotating cover 19. The fixed cover 18 is arranged at the top and the rotating cover 19 is arranged at the bottom. The middle part of the fixed cover 18 is hinged to the rotating cover 19 via a pin shaft. One side of the fixed cover 18 is hinged to the slag cleaning barrel 2 via a hinge shaft. A mouth-shaped buckle 20 is provided on the other side of the fixed cover 18. The hook head of the pressing hook 10 is hooked inside the mouth-shaped buckle 20. An upper slag inlet 21 is provided on the fixed cover 18, and a lower slag inlet 22 is provided on the rotating cover 19 to cooperate with the fixed cover 18. Slag is fed when the rotating cover 19 rotates to the position where the lower slag inlet 22 corresponds to the upper slag inlet 21 and is connected. The rotating cover 19 is lifted to unload the slag when the upper slag inlet 21 and the lower slag inlet 22 are closed.

[0024] Furthermore, there are two upper slag inlets 21, which are symmetrical and fan-shaped. There are two lower slag inlets 22 that cooperate with the upper slag inlets 21. The fixed cover 18 on the side of the upper slag inlet 21 is provided with a stop-rotation protrusion 23. The stop-rotation protrusion 23 is fixed on the same side of each upper slag inlet 21, and the stop-rotation protrusion 23 is symmetrical about the center.

[0025] A guide block 24 for vertically guiding the pressing rod 9 is installed on the inner wall of the above-mentioned slag cleaning cylinder 2. A guide socket is provided on the guide block 24. The pressing rod 9 passes through the guide socket on the guide block 24 and is hinged to the linkage rod 14. In the above-mentioned structure, the telescopic arm, crane and their specific structural connection relationship are existing technologies and will not be repeated here.

[0026] The bottom enlarging and slag cleaning method of the bottom enlarging and slag cleaning drill bit is characterized in that the bottom enlarging and slag cleaning method comprises the following steps: (1) Installation of bottom expansion and slag removal drill bit: install the upper end of the fixed body 1 on the end telescopic arm, and fix the head telescopic arm on the crane; (2) Bottom expansion and slag cleaning: The crane moves the bottom expansion and slag cleaning drill bit to the top of the drilled straight hole, starts the crane, extends the end telescopic arm, and drives the bottom expansion and slag cleaning drill bit to the bottom of the straight hole. After reaching the bottom, the telescopic arm rotates, and while the telescopic arm rotates, it presses the fixed body 1 downward, and the guide column 6 below the fixed body 1 gradually inserts into the middle of the expansion connecting plate 5 and inserts into the guide hole of the fixed body 1. In the process, the upper arm 3 and the lower arm 4 are expanded to realize the hole expansion action. During the hole expansion, the slag enters the slag cleaning barrel 2 through the slag inlet hole at the upper end of the slag cleaning barrel 2, and the slag at the bottom of the slag cleaning barrel 2 enters the interior of the slag cleaning barrel 2 through the upper slag inlet 21 and the lower slag inlet 22 on the fixed cover 18 and the rotating cover 19. After the hole expansion is completed, the telescopic arm is rotated in the opposite direction. At this time, the rotating cover 19 rotates under the action of the friction force at the bottom of the straight hole until the lower slag inlet 22 of the rotating cover 19 and the upper slag inlet 21 of the fixed cover 18 are closed. At this time, the telescopic arm is lifted. After that, the bottom slag cleaning drill bit is always in the expanded state, and the end telescopic arm is raised again, and the upper end of the positioning rod 8 contacts with the pressing plate. After continuing to lift, the pressing plate presses the positioning rod 8, and then the crane lifts the bottom slag cleaning drill bit as a whole. At this time, the fixed cover 18 and the rotating cover are opened, and the slag in the slag cleaning barrel 2 are discharged, completing the hole enlarging and slag cleaning process. After that, the bottom slag cleaning drill bit is pressed down again, and the fixed cover 18 and the rotating cover are closed and the lower end of the slag cleaning barrel 2 is removed, and the next bottom enlarging and slag cleaning process is carried out.

[0027] In the above scheme, the diameter of the slag cleaning barrel 2 is matched with the diameter of the straight hole, so that the slag cleaning barrel 2 can also play a guiding role during the rotation process, ensuring the symmetry of the hole expansion, and then ensuring that the pile body is uniformly stressed. Since the slag at the bottom of the drilled hole is removed by the slag cleaning barrel 2, the bottom of the slag cleaning barrel 2 has an upper slag inlet 21 and a lower slag inlet 22, and the upper end of the slag cleaning barrel 2 is provided with a slag inlet hole, which can ensure that the slag is thoroughly removed. Therefore, it can ensure that the subsequent connection strength between the pile body and the drilled hole is greater. Due to the adoption of the above structure, the present invention has the advantages of simple structure, good drilling effect, good slag cleaning effect, and guaranteed bonding strength between the pile body and the ground.

Claims

1. A bottom-expanding and slag-cleaning drill bit, which includes a fixed body, a slag-cleaning cylinder, an extended upper arm, an extended lower arm, an extended connecting plate, and a guide column, characterized in that The lower end of the fixed body is connected to at least two groups of extended connecting plates in the circumferential direction, each group of extended connecting plates is provided with two parallel connecting plates, and an extended gap is set between the two parallel connecting plates. The upper end of the extended upper arm is inserted into the extended gap opening and hinged with the connecting plate, the lower end of the extended upper arm is hinged to the upper end of the extended lower arm, and the lower end of the extended lower arm is hinged to the upper end of the slag cleaning barrel. The upper end of the slag cleaning barrel is connected to the guide column via the bracket, and the lower end of the guide column is fixedly connected to the slag cleaning barrel. The upper end of the guide column passes through the middle of the extended connecting plate and is inserted into the guide hole in the middle of the fixed body. The upper end of the slag cleaning barrel is provided with a slag inlet hole, and the lower end of the slag cleaning barrel is installed with a unloading cover.

2. A bottom enlarging and slag cleaning drill bit according to claim 1, characterized in that The extended upper arm is L-shaped, the upper end of the long arm of the L-shaped extended upper arm is hinged to the connecting plate, the corner position of the L-shaped extended arm is hinged to the upper end of the extended lower arm via the pin shaft, and the outer side of the L-shaped extended arm is evenly connected to the drill head tilted toward the side.

3. The bottom enlarging and slag cleaning drill bit according to claim 1, characterized in that The mounting cover is connected to the slag cleaning barrel through the cover opening assembly. The cover opening assembly includes a positioning rod, a pressing rod, a linkage rod, a pressing hook, a lower positioning block, and an upper positioning block. The upper end of the positioning rod passes through the positioning hole provided on the fixed body, the lower end of the positioning rod is connected to the upper positioning block, the lower end of the upper positioning block is connected to the pressing rod, the lower end of the pressing rod passes through the through hole of the lower positioning block on the slag cleaning barrel and is hinged to the upper end of the linkage rod. A connecting ear plate is provided on the inner wall of the slag cleaning barrel, and the lower end of the linkage rod It is hinged to the upper end of the pressing hook, and the middle part of the pressing hook is hinged to the connecting ear plate through a pin shaft. A reset spring is sleeved on the outside of the pressing rod between the upper positioning block and the lower positioning block. A reset hole is provided on the side wall of the slag cleaning barrel. The hook head of the pressing hook is inserted into the reset hole position. The unloading cover is hinged to the slag cleaning barrel through the hinge shaft. By pressing the positioning rod, the positioning rod presses the pressing rod and the linkage rod, and then presses the pressing hook, driving the pressing hook to rotate, and the unloading cover is separated from the pressing hook and then the unloading cover is opened for unloading.

4. The bottom enlarging and slag cleaning drill bit according to claim 1, characterized in that An external socket is provided above the middle of the extended connecting plate, and an internal socket is provided at the upper end of the guide column to cooperate with the external socket. The pin passes through the external socket and the internal socket to realize the positioning of the extended connecting plate and the guide column, so that the extended upper arm and the extended lower arm are in an expanded state, which is convenient for pressing the upper end of the positioning rod.

5. The bottom enlarging and slag cleaning drill bit according to claim 1, characterized in that The rear end of the fixed body is connected to the end telescopic arm, and the lower end of the head telescopic arm or the outer side of the crane is fixedly connected to the pressing plate. The end telescopic arm is lifted up to drive the fixed body to move upward, and the pressing rod on the fixed body is squeezed by the pressing plate, thereby opening the unloading cover.

6. The bottom enlarging and slag cleaning drill bit according to claim 1, characterized in that The unloading cover wraps the fixed cover and the rotating cover, the fixed cover is arranged at the top, and the rotating cover is arranged at the bottom, the middle part of the fixed cover is hinged to the rotating cover via the pin shaft, and one side of the fixed cover is hinged to the slag cleaning barrel via the hinge shaft, and a mouth-shaped buckle is provided on the other side of the fixed cover, and the hook head of the pressing hook is hooked inside the mouth-shaped buckle. The fixed cover is provided with an upper slag inlet, and the rotating cover is provided with a lower slag inlet that cooperates with the fixed cover. The slag is fed when the rotating cover is rotated to the position where the lower slag inlet corresponds to the upper slag inlet and is connected. The slag is lifted up to unload the slag when the rotating cover is rotated to the position where the upper slag inlet and the lower slag inlet are closed.

7. The bottom enlarging and slag cleaning drill bit according to claim 1, characterized in that There are two upper slag inlets, which are symmetrical and fan-shaped. There are two lower slag inlets that cooperate with the upper slag inlets. The fixed cover on the side of the upper slag inlet is provided with a stop-rotation protrusion. A stop-rotation protrusion is fixed on the same side of each upper slag inlet, and the stop-rotation protrusions are symmetrical about the center.

8. A method for bottom enlarging and slag cleaning using the bottom enlarging and slag cleaning drill bit according to claims 1 to 7, characterized in that The steps of bottom expansion and slag cleaning are as follows: (1) Installation of bottom expansion and slag removal drill bit: install the upper end of the fixed body on the end telescopic arm, and fix the head telescopic arm on the crane; (2) Bottom expansion and slag cleaning: The crane moves the bottom expansion and slag cleaning drill bit to the top of the drilled straight hole, starts the crane, extends the end telescopic arm, and drives the bottom expansion and slag cleaning drill bit to the bottom of the straight hole. After reaching the bottom, the telescopic arm rotates, and while the telescopic arm rotates, it presses the fixed body downward, and the guide column under the fixed body gradually inserts into the middle of the expansion connecting plate and inserts into the guide hole of the fixed body. In the process, the upper and lower extension arms are unfolded to realize the hole expansion action. During the hole expansion, the slag enters the slag cleaning barrel through the slag inlet hole at the upper end of the slag cleaning barrel, and the slag at the bottom of the slag cleaning barrel enters the interior of the slag cleaning barrel through the upper and lower slag inlets on the fixed cover and the rotating cover. After the hole expansion is completed, the telescopic arm is rotated in the opposite direction. At this time, the rotating cover rotates under the action of the friction force at the bottom of the straight hole, and rotates until the lower slag inlet of the rotating cover and the upper slag inlet of the fixed cover are closed. At this time, the telescopic arm is lifted. The upper and lower arms are extended and retracted, and the bottom-enlarging slag cleaning drill bit is lifted and directly disengaged from the straight hole. After the bottom-enlarging slag cleaning drill bit is lifted and straight to the ground, the bottom-enlarging slag cleaning drill bit is placed above the ground and the fixed body is continued to be pressed down. At this time, the upper and lower arms are extended until the outer sockets on the extension connecting plate correspond to the inner sockets of the guide column, and then the pins are passed through the outer sockets and the inner sockets. At this time, the bottom-enlarging slag cleaning drill bit is always in the extended state, and the end telescopic arm is lifted again. During the upward movement of the end telescopic arm, the upper end of the positioning rod contacts the pressing plate. After continuing to lift, the pressing plate presses the positioning rod, and then the crane lifts the bottom-enlarging slag cleaning drill bit as a whole. At this time, the fixed cover and the rotating cover are opened, and the slag in the slag cleaning barrel is unloaded, completing the hole enlarging and slag cleaning process. After that, the bottom-enlarging slag cleaning drill bit is pressed down again, and the fixed cover and the rotating cover are closed and the lower end of the slag cleaning barrel is removed, and the next bottom enlarging and slag cleaning process is carried out.

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