Drilling and expanding integrated drill bit

Abstract

The utility model discloses a drilling and reaming integrated drill bit, and belongs to the technical field of engineering mechanical equipment. Comprising an inner circular tube, a drill bit is arranged at the bottom of the inner circular tube, an outer circular tube which can rotate and move up and down along the inner circular tube is arranged at the upper end of the inner circular tube in a sleeving mode, and corresponding buckles are arranged at the bottom of the inner side of the outer circular tube and the upper end of the outer side of the inner circular tube; the outer side of the inner round pipe is sleeved with a rotary expansion pipe with the cross section same as the cross section of the outer pipe in shape, the lower end of the rotary expansion pipe is rotationally connected with the inner round pipe, the rotary expansion pipe is located between the outer pipe and the outer round pipe, the outer pipe and the rotary expansion pipe are hinged to a rotary expansion upper arm and a rotary expansion lower arm respectively, and the rotary expansion upper arm is hinged to the rotary expansion lower arm. The drilling and expanding integrated drill bit is scientific and reasonable in design, under the cooperation of the inner circular pipe, the outer circular pipe, the inner circular pipe and the outer circular pipe, a drilling machine can synchronously conduct disc cavity forming without reverse rotation while drilling in the forward direction, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery equipment, in particular to a drilling and expanding integrated drill bit. Background Art

[0002] With the popularization of expanded disk (including expanded bottom) piles in the field of large-diameter bridge pile foundations, rotary expansion drill bits that match rotary drilling rigs have been widely used in mechanical equipment used for hole formation. According to the working principle of rotary drilling rigs, during the drilling process, when the drill bit is filled with slag, the main winch lifts the drill bit to the outside of the ground hole to pour out the slag, and then lowers the drill rod to continue drilling. When drilling to a certain disk position, the drilling rig replaces the rotary expansion drill bit after pouring soil on the ground, and lowers the drill rod to the disk position to perform rotary cutting of the disk cavity. Repeating this cycle completes the construction of hole formation and disk cavity formation.

[0003] However, the working principle of positive circulation and reverse circulation drilling rigs is different from that of rotary drilling rigs. Positive circulation and reverse circulation drilling rigs rely on single-section round tube drill pipes to achieve hole drilling through flange connection or threaded connection. That is to say, during the drilling process, it is necessary to continuously connect each section of drill pipe to achieve continuous drilling. The speed of connecting drill pipes directly affects the working efficiency of the drilling rig. The evolution of drill pipe connection from flange connection to threaded connection is a major advancement of drilling rigs, and the working efficiency is significantly improved. Threaded connection is currently the mainstream connection method for drilling rig drill pipes.

[0004] When rotary cutting and expansion is required during drilling, there are currently two ways: one is to lift the drill pipe, remove each section of the drill pipe, replace the rotary expansion drill bit, connect each section of the drill pipe, and lower the drill pipe to the disc cavity position to form the disc cavity. After the disc cavity is formed, lift the drill pipe again, remove each section of the drill pipe again, replace the drilling bit and continue drilling. When drilling to the next disc position, repeat the above steps until the formation of all disc cavities and the formation of pile holes are completed; another way is: do not disassemble the drill rod, and switch the work of the footage drill bit and the rotary cutting drill bit by drilling forward and backward of the drill rod. When the drill rod rotates forward, the rotary cutting drill bit remains in a retracted state and the footage drill bit rotates to drill the pile hole. When the drill rod reverses, the footage drill bit no longer rotates, while the rotary cutting drill bit rotates and gradually opens to complete the formation of the disc cavity. This requires the drill rod to be able to rotate forward and backward without disengaging, and the threaded connection cannot meet the requirements. Flange connection needs to be used instead. This is a step backward for the connection method of the drill rod. Although the drill bit does not need to be changed, the efficiency is also reduced. It can be seen from this that the hole-forming construction of the expanded disc (including bottom expansion) type pile type uses positive circulation and reverse circulation drilling rigs to form holes in the above conventional way, which has low work efficiency and poor economic benefits.

[0005] The present application solves the problem of synchronously achieving disc cavity forming of a large-diameter expanded disc (including expanded bottom) type pile foundation during the hole drilling process of a forward circulation and reverse circulation drilling rig without the need to disassemble and install the drill rod or convert the forward and reverse directions in the above manner.

[0006] In addition, in the device involved in the present application, both ends of the rotary expansion arm are respectively connected to a square tube (or other non-circular pipe fittings), and the force transmission through the square tube achieves the effect of synchronous force transmission between the upper and lower arms, thereby reducing the risk of damage to the rotary expansion arm. Utility Model Content

[0007] The purpose of the utility model is to provide a drilling and expanding integrated drill bit to solve the problems raised in the above background technology.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A drilling and expanding integrated drill bit comprises an inner circular tube, a footage drill bit is connected to the bottom of the inner circular tube, an outer circular tube which can rotate and move up and down along the inner circular tube is sleeved on the upper end of the inner circular tube, the top of the outer circular tube is used to be connected to a drill rod of a drilling rig, the inner bottom of the outer circular tube and the outer upper end of the inner circular tube are provided with corresponding buckles, which are used to make the inner circular tube rotate synchronously with the outer circular tube when drilling, an outer circular tube is fixedly sleeved on the outer side of the outer circular tube, the upper end of the outer tube is fixedly connected to the outer circular tube, a rotary expansion tube with the same cross-sectional shape as that of the outer tube is sleeved on the outer side of the inner circular tube, the lower end of the rotary expansion tube is rotatably connected to the inner circular tube, the rotary expansion tube is located between the outer circular tube and the outer circular tube, and the rotary expansion tube is slidably connected to the outer tube, the rotary expansion tube rotates synchronously with the outer tube, and a rotary expansion upper arm and a rotary expansion lower arm are respectively hinged on the outer tube and the rotary expansion tube, and the rotary expansion upper arm and the rotary expansion lower arm are hinged.

[0010] As a further preferred solution of the utility model: the buckle includes a plurality of clamping blocks evenly arranged at the upper end of the outer side of the inner tube and a plurality of inserting blocks evenly arranged at the inner bottom of the outer tube, a clamping slot is opened on the top of the clamping block, and the inserting block can be inserted into the clamping slot.

[0011] As a further preferred solution of the utility model: the cross-sectional shapes of the outer tube and the rotary expansion tube are both polygonal.

[0012] As a further preferred solution of the utility model: the cross-sectional shapes of the outer tube and the rotary expansion tube are both circular, a limiting slide groove is arranged on the inner wall of the outer tube, a limiting slide plate is arranged on the outer wall of the rotary expansion tube, and the limiting slide plate is slidably arranged in the limiting slide groove.

[0013] As a further preferred solution of the utility model: a sleeve is provided on the sliding sleeve of the outer tube, and limit blocks located on the upper and lower sides of the sleeve are provided on the outer wall of the outer tube, and the upper end of the rotary expansion upper arm is hinged to the sleeve.

[0014] As a further preferred solution of the utility model: a flange is arranged at the bottom of the inner circular tube, a bearing is sleeved on the outer side of the flange, and the rotary expansion tube is sleeved on the outer side of the bearing.

[0015] As a further preferred solution of the utility model: the penetration drill bit is fixedly arranged at the bottom of the flange.

[0016] As a further preferred solution of the utility model: the cross-sectional shapes of the outer tube and the rotary expansion tube are both square.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The design of the integrated drilling and expanding drill bit is scientific and reasonable. With the cooperation of the inner and outer circular tubes and the outer tube and the rotary expansion tube, the drill rig can realize forward drilling and simultaneous cavity forming without reversing, thereby improving work efficiency. The outer tube and the rotary expansion tube cooperate to form a telescopic tube, which can drive the rotary expansion tube to rotate during hole expansion. The force transmission path is scientific and reasonable, reducing the risk of damage to the rotary expansion arm. At the same time, different cavity diameters can be expanded according to needs, with high flexibility and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic cross-sectional view of the drilling and expanding integrated drill bit in Example 1 when drilling a hole;

[0020] Figure 2 for Figure 1 An enlarged schematic diagram of the structure at the middle plug-in block;

[0021] Figure 3 It is a schematic cross-sectional view of the drilling and expanding integrated drill bit in Example 1 when the drill disc is expanded;

[0022] Figure 4 This is a schematic diagram of the main structure of the drilling and expanding integrated drill bit in Example 1 when drilling a hole;

[0023] Figure 5 This is a schematic diagram of the main structure of the drilling and expanding integrated drill bit when expanding the disc in Example 1;

[0024] Figure 6 It is a schematic diagram of the matching state of the insert block and the clamping block when drilling in Example 1;

[0025] Figure 7 It is a schematic diagram of the matching state of the insert block and the clamp block when the disk is expanded in Example 1;

[0026] Figure 8 It is a cross-sectional schematic diagram of the matching state of the outer tube and the rotary expansion tube in Example 2.

[0027] In the figure: 1. inner circular tube; 2. outer circular tube; 3. outer tube; 4. rotary expansion tube; 5. rotary expansion upper arm; 6. rotary expansion lower arm; 7. footage drill bit; 8. bearing; 9. flange; 10. casing; 11. limit block; 12. insert block; 13. clamping block; 14. hinge seat; 15. bayonet; 16. limit slide groove; 17. limit slide plate. 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 described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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. Example 1

[0029] See also Figure 1-7 The present embodiment provides a drilling and expanding integrated drill bit, comprising an inner circular tube 1, a footage drill bit 7 is connected to the bottom of the inner circular tube 1, an outer circular tube 2 which can rotate and move up and down along the inner circular tube 1 is sleeved on the upper end of the inner circular tube 1, and in practical applications, it is only necessary to leave a gap between the outer circular tube 2 and the inner circular tube 1 to achieve relative sliding and rotation between the two; the top of the outer circular tube 2 is used to connect with the drill rod of the drilling rig, and the drill rod of the drilling rig is an existing general accessory, which will not be described in detail in this application.

[0030] Corresponding buckles are provided at the inner bottom of the outer tube 2 and the outer upper end of the inner tube 1, which are used to make the inner tube 1 rotate synchronously with the outer tube 2 during drilling. Preferably, Figure 2 As shown, the buckle includes a plurality of clamping blocks 13 evenly arranged at the upper end of the outer side of the inner tube 1 and a plurality of inserting blocks 12 evenly arranged at the inner bottom of the outer tube 2. A clamping hole 15 is provided on the top of the clamping block 13, and the inserting block 12 can be inserted into the clamping hole 15. Figure 5-6 As shown, preferably, the number of the inserting blocks 12 and the number of the clamping blocks 13 are respectively four.

[0031] An outer tube 3 is fixedly mounted on the outer side of the outer circular tube 2, and the upper end of the outer tube 3 is fixedly connected to the outer circular tube 2, and the two are preferably connected by welding. A rotary expansion tube 4 with the same cross-sectional shape as the outer tube 3 is mounted on the outer side of the inner circular tube 1. Preferably, in this embodiment, the cross-sectional shapes of the outer tube 3 and the rotary expansion tube 4 are both polygonal, and the cross-sectional shapes of both are preferably square, and can also be designed as other polygons, preferably regular polygons, and can also be set to non-circular cross-sections such as pentagons, hexagons, and ellipses. These are conventional structural replacements familiar to those skilled in the art, and this application will not limit them and elaborate. The lower end of the rotary expansion tube 4 is rotatably connected to the inner circular tube 1. Specifically, as Figure 1As shown, a flange 9 is provided at the bottom of the inner tube 1, and a bearing 8 is mounted on the outer side of the flange 9, and the rotary expansion tube 4 is mounted on the outer side of the bearing 8; wherein, a square connection block corresponding to the shape of the inner wall of the rotary expansion tube 4 can be mounted on the outer ring of the bearing 8, and the rotary expansion tube 4 is mounted on the connection block to achieve the connection between the rotary expansion tube 4 and the bearing 8. This connection method is a conventional operation familiar to those skilled in the art, and this application will not repeat it. The rotary expansion tube 4 is located between the outer tube 3 and the outer circular tube 2, and the rotary expansion tube 4 is slidably connected to the outer tube 3. In actual application, since the rotary expansion tube 4 and the outer tube 3 are both steel tubes, the two only need to leave a certain gap or slight contact to achieve relative sliding between the two, and there is no need to consider the influence of friction on their service life, and the outer tube 3 can easily drive the rotary expansion tube 4 to rotate.

[0032] The outer tube 3 and the rotary expansion tube 4 are respectively hinged with a rotary expansion upper arm 5 and a rotary expansion lower arm 6, and the rotary expansion upper arm 5 is hinged with the rotary expansion lower arm 6. Specifically, in order to better realize the hole expansion while rotating, the rotary expansion arm can be stably opened outward, such as Figure 2 As shown, a sleeve 10 is slidably sleeved on the outer tube 3 , and limit blocks 11 are provided on the outer wall of the outer tube 3 at the upper and lower sides of the sleeve 10 , and the upper end of the rotary expansion upper arm 5 is hinged to the sleeve 10 .

[0033] At the same time, as a conventional necessary setting familiar to those skilled in the art, a drilling bit 7 should be provided at the bottom of the inner tube 1 . Specifically, the drilling bit 7 can be fixedly provided at the bottom of the flange 9 .

[0034] It should be noted that articulation is a conventional technology familiar to those skilled in the art, and the articulation between corresponding structures can be achieved through the articulation seat 14 in the figure, which will not be described in detail in this application.

[0035] It should be noted that in actual use of this application, when the hole needs to be expanded after drilling, Figure 3 As shown, when the block 13 releases the limit on the plug block 12, the outer tube 2 and the outer tube 3 descend along the inner tube 1. It should be considered to limit the outer tube 3 when it descends to the lowest point. The limit should be a conventional setting familiar to those skilled in the art. It only needs to reasonably design the length of the square tube. When the outer tube 3 descends to the lowest point, the top of the rotary expansion tube 4 can be pushed to the inner top of the outer tube 3; or as Figure 3 As shown, the length of the outer tube 3 is reasonably designed so that when it is reduced to the minimum, its lower end contacts the hinge seat 14 on the rotary expansion tube 4 for connecting the rotary expansion lower arm 6, and the outer tube 3 is limited by the hinge seat 14. This limitation is a conventional operation and will not be described in detail.

[0036] In practical applications, the top of the outer tube 1 is connected to the drill rod of the drilling rig. When drilling, the drilling and expanding machine is in the state of Figure 1 as well as Figure 4 As shown, the internal plug-in block 12 and the card block 13 are in the state as shown in FIG. Figure 6As shown, the insert block 12 is inserted into the clamp block 13, so that the inner tube 1 can rotate with the outer tube 2. At this time, the footage drill bit 7 is in contact with the ground, the drill rod of the drilling rig drives the outer tube 2 to rotate, and the outer tube 2 drives the inner tube 1 to rotate. At the same time, the outer tube 2 drives the rotary expansion tube 4 to rotate together through the outer tube 3, so that the rotation of the entire drilling and expansion machine is realized, so that the footage drill bit 7 completes the drilling; at this time, the rotary expansion upper arm 5 and the rotary expansion lower arm 6 are in a straight state, and the hole is not expanded, and the casing 10 is in contact with the lower limit block 11;

[0037] When expansion is required, Figure 3 , Figure 5 as well as Figure 7 As shown, the outer tube 2 is lifted up by the drill pipe of the drilling rig. When the plug block 12 leaves the clamping block 13, the outer tube 2 is rotated so that the plug block 12 is located on one side of the clamping block 13. At this time, the limit of the plug block 12 by the clamping block 13 is released, and then the outer tube 2 is lowered while rotating. At this time, the outer tube 2 drives the outer tube 3 and the rotary expansion tube 4 to rotate, while the outer tube 3 and the rotary expansion tube 4 gradually shrink, and the rotary expansion upper arm 5 and the rotary expansion lower arm 6 slowly open outward to achieve rotating and expanding the hole. The inner tube 1 is no longer subjected to the force of the outer tube 2, and the footage drill bit 7 does not drill the hole; when the outer tube 3 is lowered to the lowest point, the bottom contacts the hinge seat 14 on the rotary expansion tube 4, and the casing 10 contacts the upper limit block 11 at this time;

[0038] After the hole is expanded, continue to drill downward and lift the outer tube 2. When the plug block 12 is located above the clamping block 13, rotate the outer tube 2 so that the plug block 12 is opposite to the clamping block 13. Then lower the outer tube 2 so that the plug block 13 is inserted into the clamping block 13. At this time, the rotary expansion arm returns to the straightened state, and the outer tube 2 is rotated to drive the inner tube 1 and the footage drill bit 7 to rotate, so as to continue drilling. Example 2

[0039] See also Figure 8 On the basis of Example 1, in this embodiment, the cross-sectional shapes of the outer tube 3 and the rotary expansion tube 4 are designed to be circular. In order to realize the synchronous rotation of the outer tube 3 and the rotary expansion tube 4 and enable relative sliding between the two, a limiting slide groove 16 is provided on the inner wall of the outer tube 3, and a limiting slide plate 17 is provided on the outer wall of the rotary expansion tube 4. The limiting slide plate 17 is slidably arranged in the limiting slide groove 16.

[0040] It should be noted that the above embodiments are only specific and clear descriptions of the technical solutions and technical features of the present application. For those skilled in the art, solutions or features that belong to the prior art or common knowledge are not described in detail in the above embodiments.

[0041] In addition, the technical solutions of the present application are not limited to the above-mentioned embodiments. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A drilling and expanding integrated drill bit, characterized in that: The invention comprises an inner circular tube (1), the bottom of the inner circular tube (1) is connected to a drilling bit (7), the upper end of the inner circular tube (1) is sleeved with an outer circular tube (2) which can rotate and move up and down along the inner circular tube (1), the top of the outer circular tube (2) is used to be connected to a drill rod of a drilling rig, the inner bottom of the outer circular tube (2) and the outer upper end of the inner circular tube (1) are both provided with corresponding buckles, which are used to make the inner circular tube (1) rotate synchronously with the outer circular tube (2) when drilling, the outer circular tube (2) is fixedly sleeved with an outer tube (3), the upper end of the outer tube (3) is connected to the outer circular tube (2) The inner tube (2) is fixedly connected, and a rotary expansion tube (4) having a cross-sectional shape identical to that of the outer tube (3) is sleeved on the outer side of the inner tube (1). The lower end of the rotary expansion tube (4) is rotatably connected to the inner tube (1). The rotary expansion tube (4) is located between the outer tube (3) and the outer tube (2), and the rotary expansion tube (4) is slidably connected to the outer tube (3). The rotary expansion tube (4) rotates synchronously with the outer tube (3). A rotary expansion upper arm (5) and a rotary expansion lower arm (6) are respectively hingedly connected to the outer tube (3) and the rotary expansion tube (4). The rotary expansion upper arm (5) and the rotary expansion lower arm (6) are hingedly connected.

2. The drilling and expanding integrated drill bit according to claim 1, characterized in that: The buckle comprises a plurality of clamping blocks (13) uniformly arranged at the upper end of the outer side of the inner circular tube (1) and a plurality of inserting blocks (12) uniformly arranged at the bottom of the inner side of the outer circular tube (2). A clamping opening (15) is provided at the top of the clamping block (13), and the inserting block (12) can be inserted into the clamping opening (15).

3. The drilling and expanding integrated drill bit according to claim 1, characterized in that: The cross-sectional shapes of the outer tube (3) and the rotary expansion tube (4) are both polygonal.

4. The drilling and expanding integrated drill bit according to claim 1, characterized in that: The cross-sectional shapes of the outer tube (3) and the rotary expansion tube (4) are both circular; a limit slide groove (16) is provided on the inner wall of the outer tube (3); a limit slide plate (17) is provided on the outer wall of the rotary expansion tube (4); and the limit slide plate (17) is slidably disposed in the limit slide groove (16).

5. The drilling and expanding integrated drill bit according to claim 3 or 4, characterized in that: The outer tube (3) is slidably sleeved with a sleeve (10), and the outer wall of the outer tube (3) is provided with limit blocks (11) located at upper and lower sides of the sleeve (10), and the upper end of the rotary expansion upper arm (5) is hingedly connected to the sleeve (10).

6. The integrated drilling and expanding drill bit according to claim 1, characterized in that: A flange (9) is provided at the bottom of the inner circular tube (1), a bearing (8) is sleeved on the outside of the flange (9), and the rotary expansion tube (4) is sleeved on the outside of the bearing (8).

7. The drilling and expanding integrated drill bit according to claim 6, characterized in that: The penetration drill bit (7) is fixedly arranged at the bottom of the flange (9).

8. The drilling and expanding integrated drill bit according to claim 3, characterized in that: The cross-sectional shapes of the outer tube (3) and the rotary expansion tube (4) are both square.

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