A type of bottom-expanding slag-removing drill bit

Abstract

This invention relates to the field of drill bit drilling technology, specifically a bottom-expanding and slag-removing drill bit. The drill bit includes a fixed body, a slag-removing cylinder, an extended upper arm, an extended lower arm, an extended connecting plate, and a guide post. The lower end of the fixed body is circumferentially connected to at least two sets of extended connecting plates. Each set of extended connecting plates has two parallel connecting plates, with an expansion gap between the two parallel connecting plates. The upper end of the extended upper arm is inserted into the expansion gap and hinged to the connecting plate. The lower end of the extended upper arm is hinged to the upper end of the extended lower arm. The lower end of the extended lower arm is hinged to the upper end of the slag-removing cylinder. The upper end of the slag-removing cylinder is connected to the guide post via a bracket. The lower end of the guide post is fixedly connected to the slag-removing cylinder. The upper end of the guide post passes through the middle of the extended connecting plate and inserts into the guide hole in the middle of the fixed body. A discharge cover is installed at the lower end of the slag-removing cylinder. This drill bit has advantages such as simple structure, good drilling effect, good slag-removing effect, and ensuring the bonding strength between the pile and the ground.

Description

Technical Field

[0001] This invention relates to the field of drill bit drilling technology, specifically to a bottom-expanding slag-removing drill bit that has a simple structure, good drilling effect, good slag removal effect, and ensures the bonding strength between the pile body and the ground. Background Technology

[0002] As is well known, enlarged-base piles are cast-in-place piles with a base diameter larger than the upper pile diameter. The bearing capacity of a single pile is significantly increased compared to the bearing capacity of the pile body diameter. Drilled enlarged-base cast-in-place piles are a relatively new construction method, representing an improvement and innovation of drilled cast-in-place piles. After drilling to reach 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 cast-in-place piles without enlarged heads.

[0003] Currently, existing enlarged-base piles generally have the function of enlarging the borehole diameter. Since the bottom of the enlarged-base pile usually needs to be fixed with a limiting sleeve to position the expanded part of the pile, there will be slag at the bottom of the enlarged hole. When the pile body is combined with the ground, the slag at the bottom of the pile hole will cause the bottom of the pile body to not be tightly bonded to the ground, resulting in low connection strength. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a slag-clearing drill bit with a simple structure, good drilling effect, good slag removal effect, and guaranteed bonding strength between the pile body and the ground.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A bottom-expanding slag-cleaning drill bit includes a fixed body, a slag-cleaning cylinder, an extended upper arm, an extended lower arm, an extended connecting plate, and a guide post. The fixed body is characterized by its lower end being circumferentially connected to at least two sets of extended connecting plates. Each set of extended connecting plates has two parallel connecting plates, with an expansion gap between them. The upper end of the extended upper arm is inserted into the expansion gap and hinged to the connecting plate. The lower end of the extended upper arm is hinged to the upper end of the extended lower arm. The lower end of the extended lower arm is hinged to the upper end of the slag-cleaning cylinder. The upper end of the slag-cleaning cylinder is connected to the guide post via a bracket. The lower end of the guide post is fixedly connected to the slag-cleaning cylinder. The upper end of the guide post passes through the middle of the extended connecting plate and inserts into a guide hole in the middle of the fixed body. The upper end of the slag-cleaning cylinder has a slag inlet hole, and the lower end of the slag-cleaning cylinder is fitted with a discharge cover.

[0007] The extended upper arm of the present invention 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 of the L-shaped extended arm is hinged to the upper end of the extended lower arm via a pin. Drill heads inclined to the side are evenly distributed on the outer side of the L-shaped extended arm.

[0008] The mounting cover of this invention is connected to the slag cleaning cylinder via a 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 a positioning hole on the fixing 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 a through hole in the lower positioning block on the slag cleaning cylinder and is hinged to the upper end of the linkage rod. A connecting lug is provided on the inner wall of the slag cleaning cylinder. The linkage rod... The lower end 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. A return spring is sleeved on the outside of the pressing rod between the upper positioning block and the lower positioning block. The side wall of the slag cleaning cylinder is provided with a return hole. The hook head of the pressing hook is inserted into the return hole. The unloading cover is hinged to the slag cleaning cylinder through a hinge pin. By pressing the positioning rod, the positioning rod presses the pressing rod and the linkage rod, which in turn presses the pressing hook, causing the pressing hook to rotate. The unloading cover is disengaged from the pressing hook and then the unloading cover is opened for unloading.

[0009] The expansion connecting plate of the present invention has an external insertion hole at the upper middle part, and the upper end of the guide post has an internal insertion hole that mates with the external insertion hole. The pin passes through the external insertion hole and the internal insertion hole to position the expansion connecting plate and the guide post, so that the upper and lower expansion arms are in an unfolded state, which facilitates pressing the upper end of the positioning rod.

[0010] The rear end of the fixed body described in this invention is connected to the end telescopic arm. The lower end of the first telescopic arm or the outside of the crane is fixedly connected to a pressing plate. When the end telescopic arm is lifted, the fixed body moves upward. The pressing rod on the fixed body is squeezed by the pressing plate, thereby opening the unloading cover.

[0011] The unloading cover of this invention includes a fixed cover and a rotating cover. The fixed cover is located on top, and the rotating cover is located on the bottom. The middle part of the fixed cover is hinged to the rotating cover via a pin shaft. One side of the fixed cover is hinged to the slag cleaning cylinder via a hinge shaft. The other side of the fixed cover has a U-shaped buckle on its upper part. The hook head of the pressing hook is hooked inside the U-shaped buckle. The fixed cover has an upper slag inlet on its upper part, and the rotating cover has a lower slag inlet that cooperates with the fixed cover. When the rotating cover is rotated to the position where the lower slag inlet and the upper slag inlet are aligned and connected, slag is fed in. When the rotating cover is rotated to the position where the upper slag inlet and the lower slag inlet are closed, the slag is lifted and unloaded.

[0012] The present invention has two upper slag inlets, which are symmetrically arranged in a fan shape. The lower slag inlets have two parts that cooperate with the upper slag inlets. The fixed cover on the side of the upper slag inlet is provided with an anti-rotation protrusion. An anti-rotation protrusion is fixed on the same side of each upper slag inlet, and the anti-rotation protrusions are centrally symmetrical.

[0013] Because of the above-mentioned structure, this invention has the advantages of simple structure, good drilling effect, good slag removal effect, and ensuring the bonding strength between the pile body and the ground. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the structure of the present invention.

[0015] Figure 2 yes Figure 1 Schematic diagram of the extended upper arm and extended lower arm unfolding structure.

[0016] Figure 3 yes Figure 1 A magnified view of a section of the slag cleaning cylinder.

[0017] Figure 4 yes Figure 1 Bottom view of the fixed cover and the rotating cover.

[0018] Figure 5 yes Figure 4 A schematic diagram of the structure of the fixed cover.

[0019] Figure 6 yes Figure 4 A schematic diagram of the rotating cover. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings:

[0021] As shown in the attached figure, a bottom-expanding slag-cleaning drill bit includes a fixed body 1, a slag-cleaning cylinder 2, an extended upper arm 3, an extended lower arm 4, an extended connecting plate 5, and a guide post 6. The fixed body 1 is characterized in that its lower end is circumferentially connected to at least two sets of extended connecting plates 5. Each set of extended connecting plates 5 has two parallel connecting plates, with an expansion gap between the two parallel connecting plates. The upper end of the extended upper arm 3 is inserted into the expansion gap and hinged to the connecting plate. The lower end of the extended upper arm 3 is hinged to the upper end of the extended lower arm 4. The lower end of the extended lower arm 4 is hinged to the upper end of the slag-cleaning cylinder 2. The upper end of the slag-cleaning cylinder 2 is connected to the guide post 6 via a bracket. The lower end of the guide post 6 is fixedly connected to the slag-cleaning cylinder 2. The upper end of the guide post 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 cylinder 2 has a slag inlet hole, and the lower end of the slag-cleaning cylinder 2 is fitted with a discharge cover.

[0022] Furthermore, the extended upper arm 3 is L-shaped, with the upper end of the long arm of the L-shaped extended upper arm 3 hinged to the connecting plate, and the corner of the L-shaped extended arm hinged to the upper end of the extended lower arm 4 via a pin shaft. Drill heads 7, which are inclined to the side, are evenly distributed on the outer side of the L-shaped extended arm.

[0023] Furthermore, the mounting cover is connected to the slag cleaning cylinder 2 via a cover opening assembly. 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 a positioning hole on the fixing 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 a through hole in the lower positioning block 11 on the slag cleaning cylinder 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 cylinder 2. The lower end of the linkage rod 14... The end of the pressing hook 10 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. The pressing rod 9 between the upper positioning block 12 and the lower positioning block 11 is fitted with a return spring 13. The side wall of the slag cleaning cylinder 2 is provided with a return hole 16. The hook head of the pressing hook 10 is inserted into the position of the return hole 16. The unloading cover is hinged to the slag cleaning cylinder 2 through a 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, causing the pressing hook 10 to rotate. The unloading cover is disengaged from the pressing hook 10 and then the unloading cover is opened for unloading.

[0024] Furthermore, the expansion connecting plate 5 is provided with an external insertion hole 17 at the upper middle part, and the guide post 6 is provided with an internal insertion hole that cooperates with the external insertion hole 17 at its upper end. The pin passes through the external insertion hole 17 and the internal insertion hole to position the expansion connecting plate 5 and the guide post 6, so that the expansion upper arm 3 and the expansion lower arm 4 are in an unfolded state, which facilitates pressing the upper end of the positioning rod 8.

[0025] Furthermore, the rear end of the fixed body 1 is connected to the end telescopic arm, and the lower end of the first telescopic arm or the outside of the crane is fixedly connected to the pressing plate. When the end telescopic arm is lifted, it drives 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.

[0026] Furthermore, the unloading cover encloses the fixed cover 18 and the rotating cover 19. The fixed cover 18 is located on top, and the rotating cover 19 is located on 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 cylinder 2 via a hinge shaft. The other side of the fixed cover 18 is provided with a U-shaped buckle 20. The hook head of the pressing hook 10 is hooked inside the U-shaped buckle 20. The fixed cover 18 is provided with an upper slag inlet 21, and the rotating cover 19 is provided with a lower slag inlet 22 that cooperates with the fixed cover 18. When the rotating cover 19 rotates to the position where the lower slag inlet 22 and the upper slag inlet 21 are aligned and connected, slag is fed in. When the rotating cover 19 rotates to the position where the upper slag inlet 21 and the lower slag inlet 22 are closed, the slag is lifted and unloaded.

[0027] Furthermore, the upper slag inlet 21 is provided with two symmetrical fan-shaped structures, and the lower slag inlet 22 is provided with two that cooperate with the upper slag inlet 21. The fixing cover 18 on the side of the upper slag inlet 21 is provided with anti-rotation protrusions 23, and each upper slag inlet 21 has an anti-rotation protrusion 23 fixed on the same side, and the anti-rotation protrusions 23 are centrally symmetrical.

[0028] The inner wall of the aforementioned slag cleaning cylinder 2 is equipped with a guide block 24 that guides the pressing rod 9 vertically. The guide block 24 is provided with a guide insertion hole. After the pressing rod 9 passes through the guide insertion hole on the guide block 24, it is hinged to the linkage rod 14. In the above structure, the telescopic arm, the crane and their specific structural connection relationship are existing technologies and will not be described in detail here.

[0029] The above-mentioned method for reaming and cleaning the bottom of the drill bit is characterized by the following steps:

[0030] (1) Installation of the bottom-expanding and slag-removing drill bit: Install the upper end of the fixed body 1 on the end telescopic arm, and fix the first end telescopic arm on the crane;

[0031] (2) Expansion and cleaning: The crane moves the expansion and cleaning drill bit above the drilled straight hole. The crane starts and extends the telescopic arm to move the expansion and cleaning drill bit to the bottom of the straight hole. After reaching the bottom, the telescopic arm rotates. While the telescopic arm rotates, it presses the fixed body 1 downwards. The guide post 6 below the fixed body 1 gradually inserts into the middle of the expansion connecting plate 5 and into the guide hole of the fixed body 1. During this process, the upper extension arm 3 and the lower extension arm 4 unfold to realize the hole expansion action. During the hole expansion process, the slag enters the cleaning cylinder 2 through the slag inlet hole at the upper end of the cleaning cylinder 2. The slag at the bottom of the cleaning cylinder 2 enters the interior of the cleaning cylinder 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 friction 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 crane is lifted. Raise the telescopic arm, extend the upper arm 3 and extend the lower arm 4 to retract, lift the bottom-expanding and slag-cleaning drill bit straight out of the straight hole. After the bottom-expanding and slag-cleaning drill bit is lifted to the ground, place it above the ground and continue to press down the fixing body 1. At this time, extend the upper arm 3 and extend the lower arm 4 until the external insertion hole 17 on the extension connecting plate 5 corresponds to the position of the internal insertion hole of the guide post 6. Then, pass the pin through the external insertion hole 17 and the internal insertion hole. At this time, the bottom-expanding and slag-cleaning drill bit is always in the extended state. Lift the end telescopic arm again. During the upward movement of the end telescopic arm, the upper end of the positioning rod 8 contacts the pressing plate. After continuing to lift, the pressing plate presses the positioning rod 8. Then, the crane lifts the bottom-expanding and slag-cleaning drill bit as a whole. At this time, the fixing cover 18 and the rotating cover open, and the slag in the slag-cleaning cylinder 2 is unloaded, completing the hole expansion and slag-cleaning process. Then, press down the bottom-expanding and slag-cleaning drill bit again, and the fixing cover 18 and the rotating cover close the lower end of the slag-cleaning cylinder 2. Take out the pin and start the next bottom-expanding and slag-cleaning process.

[0032] In the above scheme, the diameter of the slag removal cylinder 2 matches the diameter of the straight hole. This allows the slag removal cylinder 2 to act as a guide during rotation, ensuring the symmetry of the hole expansion and thus ensuring uniform stress on the pile body. Since the slag at the bottom of the borehole is removed by the slag removal cylinder 2, which has an upper slag inlet 21 and a lower slag inlet 22 at the bottom and a slag inlet hole at the upper end, the slag removal can be thorough. Therefore, it can ensure a stronger connection between the subsequent pile body and the borehole. Due to the above structure, this invention has the advantages of simple structure, good drilling effect, good slag removal effect, and ensuring the bonding strength between the pile body and the ground.

Claims

1. A bottom-expanding slag-cleaning drill bit, comprising a fixed body, a slag-cleaning cylinder, an extended upper arm, an extended lower arm, an extended connecting plate, and a guide post, characterized in that... The lower end of the fixed body is circumferentially connected to at least two sets of extended connecting plates. Each set of extended connecting plates has two parallel connecting plates, with an extension gap between the two parallel connecting plates. The upper end of the extended upper arm is inserted into the extension gap and hinged to the connecting plate. The lower end of the extended upper arm is hinged to the upper end of the extended lower arm. The lower end of the extended lower arm is hinged to the upper end of the slag cleaning cylinder. The upper end of the slag cleaning cylinder is connected to a guide column via a bracket. The lower end of the guide column is fixedly connected to the slag cleaning cylinder. 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 cylinder has a slag inlet hole. The lower end of the slag cleaning cylinder is equipped with a discharge cover. The discharge cover is connected to the slag cleaning cylinder via a 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 cylinder and is hinged to the upper end of the linkage rod, the inner wall of the slag cleaning cylinder is provided with a connecting ear plate, the lower end of the linkage rod 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, a return spring is sleeved on the outer side of the pressing rod between the upper positioning block and the lower positioning block, the side wall of the slag cleaning cylinder is provided with a return hole, the hook head of the pressing hook is inserted into the return hole, the unloading cover is hinged to the slag cleaning cylinder through a hinge pin, 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, the unloading cover disengages from the pressing hook and then opens the unloading cover to unload.

2. The underreaming and slag-removing 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 of the L-shaped extended arm is hinged to the upper end of the extended lower arm via a pin. Drill heads inclined to the side are evenly distributed on the outer side of the L-shaped extended arm.

3. The underreaming and slag-removing drill bit according to claim 1, characterized in that... The expansion connecting plate has an external insertion hole at the top center, and the guide post has an internal insertion hole at the top end that mates with the external insertion hole. The pin passes through the external insertion hole and the internal insertion hole to position the expansion connecting plate and the guide post, so that the upper and lower expansion arms are in an unfolded state, making it easier to press the upper end of the positioning rod.

4. A slag-removing 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 first telescopic arm or the outside of the crane is fixedly connected to the pressing plate. When the end telescopic arm is lifted, the fixed body moves upward, and the pressing rod on the fixed body is squeezed by the pressing plate, thereby opening the unloading cover.

5. A slag-removing drill bit according to claim 1, characterized in that... The discharge cover includes a fixed cover and a rotating cover. The fixed cover is located on top, and the rotating cover is located on the bottom. The middle part of the fixed cover is hinged to the rotating cover via a pin shaft. One side of the fixed cover is hinged to the slag cleaning cylinder via a hinge shaft. The other side of the fixed cover has a U-shaped buckle. The hook head of the pressing hook is hooked inside the U-shaped buckle. The fixed cover has an upper slag inlet, and the rotating cover has a lower slag inlet that cooperates with the fixed cover. When the rotating cover is rotated to the position where the lower slag inlet and the upper slag inlet are aligned and connected, slag is fed in. When the rotating cover is rotated to the position where the upper slag inlet and the lower slag inlet are closed, the slag is lifted and discharged.

6. A bottom-expanding and slag-removing drill bit according to claim 5, characterized in that... The upper slag inlet has two symmetrical fan-shaped structures. The lower slag inlet has two structures that cooperate with the upper slag inlet. The fixed cover on the side of the upper slag inlet has anti-rotation protrusions. Anti-rotation protrusions are fixed on the same side of each upper slag inlet, and the anti-rotation protrusions are centrally symmetrical.

Images