Reaming drill bit

Abstract

The present invention discloses a reaming drill bit, which includes a drill barrel, an end head, an expansion wing assembly, a piston assembly, and a detection device, wherein the end head is installed at the end of the drill barrel, the piston assembly slides relative to the drill barrel, the piston assembly is suitable for driving the expansion wing assembly to expand or retract, a first injection channel is provided in the drill barrel, and the piston assembly is provided with a first pressure relief channel and a second pressure relief channel. When the piston assembly drives the expansion wing assembly to expand into place, the first pressure relief channel is connected to the first injection channel; when the piston assembly drives the expansion wing assembly to retract into place, the second pressure relief channel is connected to the first injection channel, and the detection device is suitable for detecting the pressure or flow in the first injection channel to check whether the expansion or retraction of the expansion wing assembly is in place. The present invention realizes the drive control of the expansion wing with an economical and effective solution, improves the rigidity of the equipment, is more suitable for hard rock and soil, and can help operators master the working status of the equipment.

Description

Technical Field

[0001] The present invention relates to the field of engineering machinery, and more particularly to a hole reaming drill bit. Background Art

[0002] With the rapid development of infrastructure construction in my country, the amount of construction pile foundations or anchor rods is getting larger and larger, and the requirements for the bearing capacity of pile foundations or anchor rods are getting higher and higher. The use of expanded bottom piles or expanded body anchor rods is an effective means to improve the bearing capacity of single piles or single anchors.

[0003] However, the reaming drill bits in the prior art still have some defects:

[0004] The traditional reaming drill bit is relatively thin in structure and has poor rigidity. When encountering hard rock and soil, it often deforms and is prone to damage.

[0005] Conventional drills generally use a combination of hydraulic drive and spring structure to drive the expansion and retraction of the expansion wing assembly, wherein the hydraulic structure is used to press down the expansion wing assembly, and the spring structure is used to reset the expansion wing assembly. However, this structure requires a very large hydraulic pressure and the spring is easily damaged.

[0006] In addition, the reaming drill bit in the prior art has no specific detection and control means for the deployment or retraction status of the expansion wing, and mainly relies on experience for operation. The expansion wing may be stuck by stones in the hole during the deployment or retraction process, which has an adverse effect on the normal reaming operation. The quality and accuracy of the hole cannot be guaranteed, and it is difficult to meet the design requirements. Summary of the invention

[0007] One purpose of the present invention is to provide a reaming drill bit, which optimizes the overall mechanical torque structure, improves the rigidity of the equipment, is more suitable for hard rock and soil, and improves the engineering quality.

[0008] Another object of the present invention is to provide a reaming drill bit with a simple structure, high reliability, reduced pressure loss, realizing drive control of the expansion wing in an economical and effective manner, and improving the construction safety factor.

[0009] Another object of the present invention is to provide a reaming drill bit that can detect the deployment and retraction status of the expansion wing, help operators understand the working status of the equipment, and help improve construction quality.

[0010] In order to achieve the above object, the present invention provides a reaming drill bit, which comprises:

[0011] A drill tube, a tip, an expansion wing assembly, a piston assembly, and a detection device, wherein the tip is mounted on the end of the drill tube, the piston assembly slides relative to the drill tube, and the piston assembly is suitable for driving the expansion wing assembly to expand or retract;

[0012] A first injection channel is provided in the drill barrel, and a first pressure relief channel and a second pressure relief channel are provided in the piston assembly. When the piston assembly drives the expansion wing assembly to unfold into place, the first pressure relief channel is connected to the first injection channel; when the piston assembly drives the expansion wing assembly to retract into place, the second pressure relief channel is connected to the first injection channel. The detection device is suitable for detecting the pressure or flow in the first injection channel.

[0013] When the first pressure relief channel or the second pressure relief channel is connected to the first injection channel, the pressure or flow in the first injection channel will suddenly change, so that the operator can determine whether the expansion wing assembly is fully deployed or retracted by observing the reading of the detection device.

[0014] Furthermore, a first cavity and a second cavity are formed between the drill barrel and the piston assembly, and a second injection channel and a third injection channel are provided in the drill barrel. The second injection channel connects the outside with the first cavity, and the third injection channel connects the outside with the second cavity.

[0015] External liquid enters the first chamber through the second injection channel, and the first chamber applies an upward liquid pressure to the piston assembly, causing the piston assembly to move upward; external liquid enters the second chamber through the third injection channel, and the second chamber applies a downward liquid pressure to the piston assembly, causing the piston assembly to move downward, and the expansion wing assembly is expanded or retracted under the drive of the piston assembly.

[0016] According to a preferred embodiment of the present invention, a hydraulic chamber is defined in the drill barrel, the piston assembly is adapted to slide along an inner wall of the hydraulic chamber, and the piston assembly separates the hydraulic chamber into the first chamber and the second chamber.

[0017] According to another preferred embodiment of the present invention, the piston assembly is a piston tube, the drill barrel is provided with a step, the step is suitable for relative sliding along the inner wall of the piston tube, the first cavity and the second cavity are formed between the step and the inner wall of the piston tube, and the piston tube slides up and down under the action of the liquid pressure of the first cavity and the second cavity.

[0018] According to a preferred embodiment of the present invention, the piston assembly includes a piston tube and a piston, wherein the piston is fixedly disposed on the piston tube, the piston tube is suitable for being slidably disposed in the drill barrel along the inner wall of the first injection channel, the piston is suitable for sliding along the inner wall of the hydraulic chamber, and the piston drives the piston tube to slide up and down under the action of the liquid pressure of the first chamber and the second chamber.

[0019] According to a preferred embodiment of the present invention, the first injection channel runs through the drill barrel, and the tube wall of the piston tube is provided with a first pressure relief hole and a second pressure relief hole, when the piston moves to the point where the expansion wing assembly is unfolded, the first pressure relief hole enters the first cavity along with the movement of the piston tube and is connected with the second injection channel to form the first pressure relief channel, and the liquid passed into the first cavity from the second injection channel can flow into the piston tube and the first injection channel through the first pressure relief hole, and when the piston moves to the point where the expansion wing assembly is retracted, the second pressure relief hole enters the second cavity along with the movement of the piston tube and is connected with the third injection channel to form the second pressure relief channel, and the liquid passed into the second cavity from the third injection channel can flow into the piston tube and the first injection channel through the second pressure relief hole.

[0020] According to another preferred embodiment of the present invention, the first injection channel includes at least two isolated pipe sections, both ends of the pipe sections pass through the drill barrel, the first pressure relief channel and the second pressure relief channel are arranged in the piston tube, when the piston tube moves to the point where the expansion wing assembly is deployed, the first pressure relief channel is connected to the isolated pipe sections, when the piston tube moves to the point where the expansion wing assembly is retracted, the second pressure relief channel is connected to the two isolated pipe sections, when the first pressure relief channel or the second pressure relief channel is connected to the isolated pipe sections, external liquid can pass through the drill barrel from the first injection channel.

[0021] According to another preferred embodiment of the present invention, the first pressure relief channel and the second pressure relief channel are in a "U" shape.

[0022] Furthermore, two ends of the expansion wing assembly are swingably connected to the end of the piston tube and the drill tube respectively, and the end of the expansion wing assembly is extended or retracted under the drive of the piston tube.

[0023] Furthermore, the expansion wing assembly includes a connecting arm and a cutting arm, the two ends of the connecting arm are respectively swingably connected to the cutting arm and the drill tube, and the two ends of the cutting arm are respectively swingably connected to the connecting arm and the end of the piston tube.

[0024] According to a preferred embodiment of the present invention, a movable space is provided at the lower end of the drill barrel, and the reaming drill bit also includes a moving block, which is connected to the end of the piston tube, and the two ends of the connecting arm are respectively swingably connected to the cutting arm and the drill barrel, and the two ends of the cutting arm are respectively swingably connected to the connecting arm and the moving block, and the moving block moves up and down in the movable space driven by the piston tube, thereby driving the expansion wing assembly to be unfolded or retracted.

[0025] According to a preferred embodiment of the present invention, the moving block is detachably connected to the piston tube, and the expansion wing assembly is detachably connected to the moving block and the drill barrel, so as to facilitate subsequent maintenance and replacement, and the expansion diameter can be adjusted later by replacing expansion wing assemblies of different specifications and sizes.

[0026] Furthermore, a receiving groove is provided on the outer wall of the drill tube for receiving the expansion wing assembly in a retracted state.

[0027] According to a preferred embodiment of the present invention, annular steps are respectively provided at both ends of the piston along the stroke direction, and the design of the steps facilitates the formation of hydraulic pressure in the initial stage when external liquid flows into the hydraulic chamber from the first injection channel or the second injection channel.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The overall mechanical torque structure is optimized, the equipment rigidity is improved, and it is more suitable for hard rock and soil;

[0030] (2) By setting the first chamber and the second chamber between the drill tube and the piston assembly, and cooperating with the second injection channel and the third injection channel, the drive control of the expansion wing is realized, which reduces a large amount of pressure loss, reduces equipment cost, and improves the construction safety factor;

[0031] (3) By arranging the first pressure relief channel and the second pressure relief channel on the piston assembly, the flow or pressure detection device is used to detect whether the expansion wing is fully deployed or retracted, which makes it easier for operators to understand the equipment status and improve the construction accuracy.

[0032] The above and other objects, features and advantages of the present invention will be further clarified through the following detailed description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is an exploded view of a reaming drill bit according to a first preferred embodiment of the present invention;

[0034] Figure 2 is a three-dimensional schematic diagram of a reaming drill bit according to a first preferred embodiment of the present invention with the reaming wing assembly in an expanded state;

[0035] Figure 3 is a cross-sectional schematic diagram of a reaming drill bit according to a first preferred embodiment of the present invention, with the reaming wing assembly in an expanded state;

[0036] Figure 4 is another cross-sectional schematic diagram of the reaming drill bit according to the first preferred embodiment of the present invention when the reaming wing assembly is in an expanded state;

[0037] Figure 5is a three-dimensional schematic diagram of a reaming drill bit according to a first preferred embodiment of the present invention, with the reaming wing assembly retracted;

[0038] Figure 6 is a cross-sectional schematic diagram of a reaming drill bit according to a first preferred embodiment of the present invention, with the reaming wing assembly in a retracted state;

[0039] Figure 7 is another cross-sectional schematic diagram of the reaming drill bit according to the first preferred embodiment of the present invention when the reaming wing assembly is retracted;

[0040] Figure 8 is an exploded view of a reaming drill bit according to a second preferred embodiment of the present invention;

[0041] Fig. 9 is a perspective schematic diagram of a reaming drill bit according to a second preferred embodiment of the present invention with the reaming wing assembly in an expanded state;

[0042] Fig.10 is a cross-sectional schematic diagram of a reaming drill bit according to a second preferred embodiment of the present invention, with the reaming wing assembly in an expanded state;

[0043] Fig.11 is another cross-sectional schematic diagram of the reaming drill bit according to the second preferred embodiment of the present invention when the reaming wing assembly is in an expanded state;

[0044] Fig.12 is a perspective schematic diagram of a reaming drill bit according to a second preferred embodiment of the present invention, with the reaming wing assembly retracted;

[0045] Fig.13 is a cross-sectional schematic diagram of a reaming drill bit according to a second preferred embodiment of the present invention, with the reaming wing assembly in a retracted state;

[0046] Fig.14 is another cross-sectional schematic diagram of a reaming drill bit according to a second preferred embodiment of the present invention when the reaming wing assembly is retracted

[0047] In the figure: drill barrel 10; hydraulic chamber 11; first chamber 111; second chamber 112; second injection channel 12; third injection channel 13; activity space 14; storage groove 15; end head 20; movement block 31; expansion wing assembly 32; connecting arm 321; cutting arm 322; piston assembly 40; piston tube 41; piston 42; step 421; first pressure relief hole 43; second pressure relief hole 44; first injection channel 50; drill barrel 10A; first chamber 111A; second chamber 112A; second injection channel 12A; third injection channel 13A; step 14A; storage groove 15A; pipe section 16A; pipe section 17A; end head 20A; expansion wing assembly 32A; connecting arm 321A; cutting arm 322A; piston tube 40A; first pressure relief channel 41A; second pressure relief channel 42A. DETAILED DESCRIPTION

[0048] The invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0049] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0050] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0051] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0052] See attached picture Figures 1 to 7The reaming drill bit according to the first preferred embodiment of the present invention will be explained in the following description, which includes a drill barrel 10, a head 20, an expansion wing assembly 32, and a piston assembly 40, wherein the head 20 is installed at the end of the drill barrel 10, and the head 20 is suitable for drilling operations. The drill barrel 10 has a hydraulic chamber 11, the piston assembly 40 is suitable for sliding along the inner wall of the hydraulic chamber 11, the expansion wing assembly 32 is connected to the piston assembly 40, and the piston assembly 40 is suitable for driving the expansion wing assembly 32 to expand or retract.

[0053] Further, a first injection channel 50 is provided in the drill barrel 10, and the injection channel 50 runs from the top of the drill barrel 10 to the bottom of the drill barrel 10. The piston assembly 40 includes a piston tube 41 and a piston 42, wherein the piston 42 is fixedly disposed on the piston tube 41. The piston tube 41 is adapted to be slidably disposed in the drill barrel 10 along the inner wall of the first injection channel 50. In other words, the piston tube 41 is nested in the drill barrel 10, forming a tube-in-tube structure.

[0054] The piston 42 is suitable for sliding along the inner wall of the hydraulic chamber 11, and the hydraulic chamber 11 is divided into a first chamber 111 and a second chamber 112 by the piston 42. A second injection channel 12 and a third injection channel 13 are provided in the drill pipe 10, wherein the second injection channel 12 is connected to the outside and the first chamber 111, and the third injection channel 13 is connected to the outside and the second chamber 112. External liquid enters the first chamber 111 through the second injection channel 12, and the first chamber 111 applies an upward liquid pressure to the piston 42, so that the piston 42 moves upward; external liquid enters the second chamber 112 through the third injection channel 13, and the second chamber 112 applies a downward liquid pressure to the piston 42, so that the piston 42 moves downward. The piston 42 drives the piston tube 41 to slide up and down under the action of the liquid pressure of the first chamber 111 and the second chamber 112.

[0055] Preferably, steps 421 are respectively provided at both ends of the piston 42 along the stroke direction, and the steps 421 are annular. When the piston 42 abuts against the end wall of the hydraulic chamber 11, the steps 421 form an annular cavity connected to the second injection channel 12 or the third injection channel 13, so as to facilitate the formation of hydraulic pressure in the initial stage when the external liquid flows from the second injection channel 12 or the third injection channel 13 into the hydraulic chamber 11.

[0056] Furthermore, a movable space 14 is provided at the lower end of the drill barrel 10. The reaming drill bit provided in this embodiment also includes a moving block 31, which is connected to the end of the piston tube 41, and the moving block 31 moves up and down in the movable space 14 driven by the piston tube 41. The expansion wing assembly 32 includes a connecting arm 321 and a cutting arm 322, and the two ends of the connecting arm 321 are respectively swingably connected to the cutting arm 322 and the drill barrel 10 through the cooperation of the rotating shaft and the rotating hole. Similarly, the two ends of the cutting arm 322 are respectively swingably connected to the connecting arm 321 and the moving block 31. The moving block 31 slides up and down driven by the piston tube 41, thereby driving the connecting arm 321 and the cutting arm 322 to expand or retract. The cutting arm 322 is provided with cutting teeth, and when the expansion wing assembly 32 is in the expanded state, the cutting arm 322 is suitable for bottom expansion operations.

[0057] The reaming drill bit provided by the present invention integrates the expansion wing assembly 32 and the end head 20, and can provide drilling and reaming functions at the same time, thereby simplifying the on-site construction process and helping to improve construction efficiency.

[0058] It is easy for those skilled in the art to understand that in other possible preferred embodiments, cutting teeth may also be provided on the connecting arm 321 , and the specific arrangement of the cutting teeth on the enlarged wing assembly 32 is not limited in the present invention.

[0059] Preferably, the number of the enlarged wing components 30 in this embodiment is two and they are symmetrically arranged. It is easy to understand that the number of the enlarged wing components 32 is not limited in the present invention.

[0060] Preferably, the outer wall of the drill tube 10 is provided with two receiving grooves 15 adapted to the expansion wing assembly 32 for receiving the connecting arm 321 in the retracted state, and the cutting arm 322 is received in the activity space 14 in the retracted state.

[0061] Preferably, the moving block 31 is detachably connected to the piston tube 41 by means of bolts and nuts, and the expansion wing assembly 32 is detachably connected to the moving block 31 and the drill barrel 10. The detachable connection method is convenient for subsequent maintenance and replacement, and is convenient for adjusting the expansion diameter by replacing expansion wing assemblies of different specifications and sizes at a later time.

[0062] As attached Figure 3 and attached Figure 4As shown in the figure, it shows the cross-sectional structure schematic diagram of the reaming drill bit provided by this embodiment in the expanded wing assembly 32 state from two angles. The external liquid is introduced into the first chamber 111 from the second injection channel 12, and the generated hydraulic pressure pushes the piston 42 to move upward to the top of the hydraulic chamber 11. The piston tube 41 moves upward with the piston 42 and drives the moving block 31 to be lifted up. The expanding wing assembly 32 is expanded as the moving block 31 is lifted up. As shown in the attached figure Figure 6 and attached Figure 7 As shown, it shows a schematic diagram of the cross-sectional structure of the reaming drill bit provided in this embodiment when the expansion wing assembly 32 is retracted from two angles, and external liquid is introduced into the second chamber 112 from the third injection channel 13, and the generated liquid pressure pushes the piston 42 to move downward to the bottom end of the hydraulic chamber 11, and the piston tube 41 moves downward with the piston 42 and drives the moving block 31 to move downward, and the expansion wing assembly 32 is retracted as the moving block 31 moves downward.

[0063] Preferably, the external liquid is water, which forms water pressure in the hydraulic chamber 11 and is easy to use.

[0064] It is easy for a person skilled in the art to understand that by adjusting the amount of liquid introduced into the hydraulic chamber 11 through the second injection channel 12 and the third injection channel 13, the stroke of the piston tube 41 can be controlled, thereby controlling the deployment angle of the expansion wing assembly 32. In this embodiment, the hydraulic chamber 11 and the piston assembly 40 are arranged in the drill pipe 10, and the second injection channel 12 and the third injection channel 13 are used to realize the drive control of the expansion wing assembly 32, thereby reducing a large amount of pressure loss, reducing equipment costs, and improving the construction safety factor.

[0065] It is worth mentioning that the first injection channel 50 and the piston tube 41 disposed in the first injection channel 50 can also be used as a grouting channel, which is convenient for providing mud and water from the outside to the hole according to construction requirements during the construction process, thereby improving work efficiency, equipment stability and service life. When the piston tube 41 moves to the bottom of the drill tube 10, the piston tube 41 penetrates from the top of the drill tube 10 to the end head 20. The hydraulic fluid and mud channels are separated by the first injection channel 50, the second injection channel 12, and the third injection channel 13, which greatly reduces the possibility of equipment failure caused by mud.

[0066] It is also worth mentioning that the piston tube 41 has a first pressure relief hole 43 and a second pressure relief hole 44 axially disposed in the upper and lower parts thereof. The first pressure relief hole 43 and the second pressure relief hole 44 connect the outside with the inside of the piston tube 41 .

[0067] As attached Figure 4 As shown, when the piston tube 41 moves to the point where the expansion wing assembly 32 is deployed, that is, when the piston 42 moves to the top of the hydraulic chamber 11, the first pressure relief hole 43 enters the hydraulic chamber 11 along with the movement of the piston tube 41, and the second pressure relief hole 44 leaves the hydraulic chamber 11 along with the movement of the piston tube 41, and the first pressure relief hole 43 is connected with the second injection channel 12 to form a first pressure relief channel, and the liquid entering the first chamber 111 from the second injection channel 12 can flow into the piston tube 41 through the first pressure relief channel; as shown in the attached figure Figure 7 As shown, when the piston tube 41 moves until the expansion wing assembly 32 is retracted into place, that is, when the piston 42 moves to the bottom end of the hydraulic chamber 11, the second pressure relief hole 44 enters the hydraulic chamber 11 along with the movement of the piston tube 41, and the first pressure relief hole 43 leaves the hydraulic chamber 11 along with the movement of the piston tube 41, and the second pressure relief hole 44 is connected with the third injection channel 13 to form a second pressure relief channel, and the liquid entering the second chamber 112 from the third injection channel 13 can flow into the piston tube 41 through the second pressure relief channel.

[0068] Accordingly, the reaming drill bit provided in this embodiment further includes a detection device (not shown in the figure), which is suitable for being arranged in the flow path of the first injection channel 50. When the first pressure relief hole 43 or the second pressure relief hole 44 enters the hydraulic chamber 11, the liquid in the hydraulic chamber 11 will flow into the piston tube 41 through the first pressure relief hole 43 or the second pressure relief hole 44, resulting in a sudden change in the flow rate and pressure in the first injection channel 50.

[0069] It is easy for those skilled in the art to understand that the detection device can be a flow meter or a pressure gauge, so that the operator can determine whether the expansion wing assembly 32 is fully deployed or retracted by observing the changes in the readings of the detection device, which is convenient for the operator to understand the equipment status and also convenient for confirming the actual expansion hole diameter and improving construction accuracy.

[0070] See attached picture Figures 8 to 14 The reaming drill bit according to the second preferred embodiment of the present invention will be explained in the following description, which includes a drill barrel 10A, a head 20A, an expansion wing assembly 32A, and a piston tube 40A, wherein the head 20A is installed at the end of the drill barrel 10A, and the head 20A is suitable for drilling operations. The drill barrel 10A is provided with a step 14A, and the step 14A is suitable for relative sliding along the inner wall of the piston tube 40A, and a first cavity 111A and a second cavity 112A are formed between the step 14A and the inner wall of the piston tube 40A. The piston tube 40A is suitable for driving the expansion wing assembly 32A to expand or retract.

[0071] Furthermore, the drill tube 10A is provided with a second injection channel 12A and a third injection channel 13A, wherein the second injection channel 12A is connected to the outside and the first cavity 111A, and the third injection channel 13A is connected to the outside and the second cavity 112A. External liquid is introduced into the first cavity 111A through the second injection channel 12A, and the first cavity 111A applies an upward liquid pressure to the piston tube 40A, so that the piston tube 40A moves upward; external liquid is introduced into the second cavity 112A through the third injection channel 13A, and the second cavity 112A applies a downward liquid pressure to the piston tube 40A, so that the piston tube 40A moves downward. The piston tube 40A slides up and down under the action of the liquid pressure of the first cavity 111A and the second cavity 112A.

[0072] Furthermore, a fixing sleeve 18A is fixedly provided at the upper end of the drill tube 10A. The enlarged wing assembly 32A includes a connecting arm 321A and a cutting arm 322A, and the two ends of the connecting arm 321A are respectively swingably connected to the cutting arm 322A and the fixing sleeve 18A through the cooperation of the rotating shaft and the rotating hole. Similarly, the two ends of the cutting arm 322A are respectively swingably connected to the connecting arm 321A and the outer wall of the piston tube 40A. The piston tube 40A slides up and down, thereby driving the connecting arm 321A and the cutting arm 322A to expand or retract. The cutting arm 322A is provided with cutting teeth, and when the enlarged wing assembly 32A is in the expanded state, the cutting arm 322A is suitable for bottom expansion operations.

[0073] It is easy for those skilled in the art to understand that in other possible preferred embodiments, cutting teeth may also be provided on the connecting arm 321A, and the specific arrangement of the cutting teeth on the enlarged wing assembly 32A is not limited in the present invention.

[0074] Preferably, the number of the enlarged wing components 32A in this embodiment is 3, and they are arranged at equal intervals. It is easy to understand that the number of the enlarged wing components 32A is not limited in the present invention.

[0075] Preferably, the outer walls of the fixing sleeve 18A and the piston tube 40A are respectively provided with a receiving groove 15A and a receiving groove 43A adapted to the enlarged wing assembly 32A, for receiving the connecting arm 321A and the cutting arm 322A in the retracted state.

[0076] Preferably, the expansion wing assembly 32A is detachably connected to the piston tube 40A and the fixing sleeve 18A. The detachable connection is convenient for subsequent maintenance and replacement, and is convenient for adjusting the expansion hole diameter by replacing the expansion wing assembly 32A of different specifications and sizes at a later time.

[0077] As attached Fig.10 and attached Fig.11 As shown in FIG. 1 , it shows the cross-sectional structure schematic diagram of the reaming drill bit provided in this embodiment in the expanded wing assembly 32A state from two angles. External liquid is introduced into the first cavity 111A from the second injection channel 12A, and the generated liquid pressure pushes the piston tube 40A to move upward, and the expanded wing assembly 32A is expanded as the piston tube 40A is lifted. Fig.13 and attached Fig.14 As shown, it shows a schematic diagram of the cross-sectional structure of the reaming drill bit provided in this embodiment when the expansion wing assembly 32A is retracted from two angles, and external liquid is introduced into the second chamber 112A from the third injection channel 13A, and the generated liquid pressure pushes the piston tube 40A to move downward, and the expansion wing assembly 32A is retracted as the piston tube 40A moves downward.

[0078] Preferably, the external liquid is water, which forms water pressure in the first cavity 111A and the second cavity 112A, and is easy to use.

[0079] It is easy for a person skilled in the art to understand that by adjusting the amount of liquid introduced into the first cavity 111A and the second cavity 112A by the second injection channel 12A and the third injection channel 13A, the stroke of the piston tube 40A can be controlled, thereby controlling the deployment angle of the expansion wing assembly 32A. In this embodiment, the first cavity 111A and the second cavity 112A are formed between the drill pipe 10A and the piston tube 40A, and the second injection channel 12A and the third injection channel 13A are used to realize the drive control of the expansion wing assembly 32A, thereby reducing a large amount of pressure loss, reducing equipment costs, and improving the construction safety factor.

[0080] It is worth mentioning that, see the attached figure Fig.13 , the drill tube 10A is also provided with a fourth injection channel 19A, and the fourth injection channel 19A penetrates from the outer wall of the drill tube 10A to the bottom of the drill tube 10A. When the expansion wing assembly 32A is in the retracted state, the piston tube 40A moves downward so that the second chamber 112A is connected to the fourth injection channel 19A, and the external liquid can flow from the top of the drill tube 10A to the bottom of the drill tube 10A through the third injection channel 13A, the second chamber 112A, and the fourth injection channel 19A. At this time, the third injection channel 13A, the second chamber 112A, and the fourth injection channel 19A form a grouting channel for use, which is convenient for providing mud and water from the outside to the hole according to construction requirements during the construction process, thereby improving work efficiency, equipment stability and service life.

[0081] It is also worth mentioning that Fig.11 and attached Fig.14 As shown, the drill tube 10A is further provided with an isolated pipe section 16A and a pipe section 17A, both ends of which penetrate the drill tube 10A respectively. The piston tube 40A is provided with a first pressure relief channel 41A and a second pressure relief channel 42A at intervals along the stroke direction.

[0082] As attached Fig.11 As shown, when the piston tube 40A moves to the point where the expansion wing assembly 32A is deployed, the first pressure relief channel 41A is connected to the pipe section 16A and the pipe section 17A. After the pipe section 16A and the pipe section 17A are connected, a first liquid injection channel is formed from the top of the drill tube 10A to the bottom of the drill tube 10A; as shown in the attached Fig.14 As shown, when the piston tube 40A moves until the expansion wing assembly 32A is retracted into place, the second pressure relief channel 42A is connected to the pipe section 16A and the pipe section 17A, and the pipe section 16A and the pipe section 17A are connected to form a first injection channel that runs from the top of the drill barrel 10A to the bottom of the drill barrel 10A. When the first pressure relief channel 41A or the second pressure relief channel 42A is connected to the pipe section 16A and the pipe section 17A, external liquid can pass through the drill barrel 10A from the first injection channel.

[0083] Preferably, the first pressure relief channel 41A and the second pressure relief channel 42A are quasi-U-shaped to connect the two ports separating the pipe section 16A and the pipe section 17A.

[0084] Accordingly, the reamer drill bit provided in this embodiment further includes a detection device (not shown in the figure), which is suitable for being arranged in the flow path of the first injection channel. When the first pressure relief channel 41A or the second pressure relief channel 42A is connected to the pipe segment 16A and the pipe segment 17A, the flow rate and pressure in the first injection channel will change suddenly.

[0085] It is easy for those skilled in the art to understand that the detection device can be a flow meter or a pressure gauge, so that the operator can determine whether the expansion wing assembly 32A is fully deployed or retracted by observing the changes in the readings of the detection device, which is convenient for the operator to understand the equipment status and also convenient for confirming the actual expansion hole diameter and improving construction accuracy.

[0086] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A reaming drill bit, characterized in that: include: A drill tube, a tip, an expansion wing assembly, a piston assembly, and a detection device, wherein the tip is mounted on the end of the drill tube, the piston assembly slides relative to the drill tube, and the piston assembly is suitable for driving the expansion wing assembly to expand or retract; The drill tube is provided with a first injection channel, the piston assembly is provided with a first pressure relief channel and a second pressure relief channel, and when the piston assembly drives the expansion wing assembly to unfold into place, the first pressure relief channel is connected to the first injection channel; When the piston assembly drives the expansion wing assembly to be retracted into place, the second pressure relief channel is connected to the first injection channel, and the detection device is suitable for detecting the pressure or flow in the first injection channel; the piston assembly includes a piston tube; A first cavity and a second cavity are formed between the drill tube and the piston assembly, and a second injection channel and a third injection channel are provided in the drill tube, wherein the second injection channel is connected to the outside and the first cavity, and the third injection channel is connected to the outside and the second cavity; The expansion wing assembly includes a connecting arm and a cutting arm, the two ends of the connecting arm are respectively connected to the cutting arm and the drill tube in a swingable manner, and the two ends of the cutting arm are respectively connected to the connecting arm and the end of the piston tube in a swingable manner; The number of the enlarged wing assemblies is 2 or 3.

2. The reaming drill bit according to claim 1, characterized in that: The drill tube has a hydraulic chamber in it. The piston assembly is suitable for sliding along the inner wall of the hydraulic chamber. The piston assembly divides the hydraulic chamber into the first chamber and the second chamber.

3. The reaming drill bit according to claim 1, characterized in that: The piston assembly is a piston tube, the drill tube is provided with a step, the step is suitable for relative sliding along the inner wall of the piston tube, and the first cavity and the second cavity are formed between the step and the inner wall of the piston tube.

4. The reaming drill bit according to claim 2, characterized in that: The piston assembly includes a piston tube and a piston, wherein the piston is fixedly arranged in the piston tube, the piston tube is suitable for being slidably arranged in the drill barrel along the inner wall of the first injection channel, the piston is suitable for sliding along the inner wall of the hydraulic chamber, and the piston divides the hydraulic chamber into the first chamber and the second chamber.

5. The reaming drill bit according to claim 4, characterized in that: The first injection channel runs through the drill tube, and the wall of the piston tube is provided with a first pressure relief hole and a second pressure relief hole. When the piston moves until the expansion wing assembly is fully deployed, the first pressure relief hole enters the first cavity along with the movement of the piston tube and communicates with the second injection channel to form the first pressure relief channel. When the piston moves until the expansion wing assembly is retracted into place, the second pressure relief hole enters the second chamber along with the movement of the piston tube and communicates with the third injection channel to form the second pressure relief channel.

6. The reaming drill bit according to claim 3, characterized in that: The first injection channel includes at least two isolated pipe sections, both ends of which pass through the drill barrel. The first pressure relief channel and the second pressure relief channel are arranged in the piston tube. When the piston tube moves to the point where the expansion wing assembly is deployed, the first pressure relief channel connects the isolated pipe sections. When the piston tube moves to the point where the expansion wing assembly is retracted, the second pressure relief channel connects the two isolated pipe sections.

7. The reaming drill bit according to claim 1, characterized in that: The outer wall of the drill tube is provided with a receiving groove.

8. The reaming drill bit according to claim 4, characterized in that: Both ends of the piston are respectively provided with annular steps along the stroke direction.

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