A switching device for drilling and injection integrated construction equipment

Abstract

The application discloses a switching device for drilling and grouting integrated construction equipment and belongs to the field of drilling and grouting equipment. The front end of the outer pipe of the switching device is connected with a drill bit, the rear end is connected with a drill rod, and a plurality of first grouting holes are arranged on the side wall close to the front end; the driven rotary body is a column with a closed front end and an open rear end, the side wall is provided with second grouting holes, the front end face is provided with a plurality of first flow holes, and the driven rotary body is arranged in the outer pipe and the front end face is close to the front end of the outer pipe; the cover plate is provided with second flow holes corresponding to the number and positions of the first flow holes, is clamped in the outer pipe, and is located in front of the driven rotary body; and the rotating structure is configured to drive the outer pipe to rotate relative to the driven rotary body, so that the first and second grouting holes at the corresponding positions are aligned or the first and second flow holes at the corresponding positions are aligned. The application can realize timely switching of the drilling state and the grouting state according to work requirements, can also satisfy timely switching of flushing liquid and grouting liquid and injection into different positions.

Description

Technical Field

[0001] This application relates to the field of drilling and grouting equipment technology, and in particular to a switching device for integrated drilling and grouting construction equipment. Background Technology

[0002] Grouting is an engineering procedure that uses grouting pumps or the weight of the grout itself to pump grout into cracks, concrete fissures, joints, or cavities in rock mass through drilling, pipe laying, or other methods. Based on its function, grouting can be classified into curtain grouting, consolidation grouting, backfill grouting, joint grouting, and contact grouting.

[0003] Curtain grouting, which involves injecting grout into cracks and pores in rock or soil layers to form a continuous water-blocking curtain to reduce seepage flow and pressure, has always been a major method for seepage prevention and reinforcement of the foundations of underground structures and hydraulic structures. It plays an important role in ensuring the safe operation of hydraulic structures and the reliability of underground structures.

[0004] However, curtain grouting requires a long setting time, and removing the drill rod and changing the grouting tools necessitates high labor intensity and time costs. Whether it's the borehole collapse and flushing fluid loss that occur during long drilling processes, or the repeated drilling during short cycles of grouting for seepage prevention and reinforcement, all these factors significantly increase costs and reduce work efficiency. Completing the two distinct engineering components of curtain grouting—drilling to form the borehole and grouting to form the water-stopping curtain—in a single cycle is called integrated drilling and grouting construction.

[0005] The advantage of integrated drilling and grouting construction is that it eliminates the process of starting and stopping the drill to change drilling tools between drilling and grouting. This not only greatly shortens labor time and improves production efficiency, but also effectively avoids borehole damage caused by starting and stopping the drill, reduces the probability of downhole accidents, and improves construction quality.

[0006] In integrated drilling and grouting construction, the drilling and grouting states need to be switched promptly according to work requirements. Drilling requires the injection of flushing fluid, while grouting requires the injection of grouting fluid, necessitating timely switching between the types of grout injected based on the work status. The main function of the flushing fluid is to cool and lubricate the drill bit and carry away rock cuttings; it needs to be fed into the bottom of the borehole through the drill pipe and then return to the surface through the annular space between the drill pipe and the borehole wall. Grouting fluid is a material used to reinforce and repair building structures, filling cracks and leaks; it is generally more effective when injected from the sidewall of the borehole. Currently, integrated drilling and grouting involves injecting flushing fluid or grouting fluid through multiple through-holes at the drill bit tip, without considering the injection location requirements of the flushing and grouting fluids, resulting in low drilling or grouting efficiency and poor effectiveness. Summary of the Invention

[0007] This application provides a switching device for integrated drilling and grouting construction equipment, which solves the problem that current integrated drilling and grouting methods inject flushing fluid or grouting fluid through multiple through holes at the front end of the drill bit as needed, without considering the requirements of the injection position of the flushing fluid and grouting fluid, resulting in low drilling or grouting efficiency and poor effect.

[0008] To achieve the above objectives, the technical solution of this invention is as follows:

[0009] This invention provides a switching device for an integrated drilling and grouting construction equipment, comprising an outer tube, a driven rotating body, a cover plate, and a rotating structure. The front end of the outer tube is connected to a drill bit, and the rear end is connected to a drill rod. Multiple first grouting holes are provided on the side wall near the front end. The driven rotating body is a column with a closed front end and an open rear end. Second grouting holes corresponding to the number and position of the first grouting holes are provided on its side wall. Multiple first outflow holes are provided on its front end face, located inside the outer tube with its front end face close to the front end of the outer tube. The cover plate has second outflow holes corresponding to the number and position of the first outflow holes, is secured inside the outer tube, and is located in front of the driven rotating body. The rotating structure is configured to drive the outer tube and the driven rotating body to rotate relative to each other, so that the first grouting holes at corresponding positions are aligned with the second grouting holes, or the first outflow holes at corresponding positions are aligned with the second outflow holes.

[0010] In one possible implementation, the rotating structure includes a piston, a fixed cylinder, a main rotating body, an elastic element, and a limiting cylinder; the piston includes a piston cylinder, a baffle, and a protruding plate; the baffle is provided with multiple inlet holes and is fixed to the rear end of the piston cylinder; a radially outward first boss is provided in the middle of the piston cylinder; the front end of the first boss has continuous triangular teeth evenly distributed circumferentially, the thickness of the triangular teeth is less than the thickness of the first boss, and a protruding plate is provided behind each triangular tooth, the center line of the protruding plate is collinear with the tooth tip of the triangular tooth; the fixed cylinder includes at least two sets of slot groups evenly distributed around its own circumference; each set of slot groups includes a first slot, a card, and a second slot arranged sequentially; the first slot and the second slot are axially recessed from the front end face of the fixed cylinder, the axial depth of the first slot is less than the axial depth of the second slot, the end face of the first slot is a slope, and the end face of the card is a slope; the number of triangular teeth is twice the number of slot groups; the main rotating body includes A first tube body, a second tube body, and rotating teeth; the first tube body and the second tube body are integrally connected, and the outer diameter of the first tube body is larger than the outer diameter of the second tube body; a second protrusion is provided at the front end of the first tube body in a radially outward manner; the number of rotating teeth is the same as the number of slot groups, and they are arranged circumferentially around the central axis of the fixed cylinder, with one end fixed to the end face of the second protrusion, and the other end being an inclined surface that extends out of the end face of the first tube body, with a thickness greater than the wall thickness of the slot group of the fixed cylinder; the fixed cylinder and the main rotating body are sleeved on the piston, and a protruding piece is engaged at the position of the second slot, and the rotating teeth can cooperate with the first slot, the card, and the second slot; a limiting cylinder is provided at the rear end of the driven rotating body; an elastic element is sleeved on the main rotating body, with both ends abutting against the limiting cylinder and the main rotating body; the main rotating body passes through the limiting cylinder and is connected to the driven rotating body; the rotating structure is provided inside the outer tube, and both the fixed cylinder and the limiting cylinder are fixed to the outer tube.

[0011] In one possible implementation, an axial guide groove is provided on the inner wall of the fixed cylinder at the position corresponding to the first slot; when the fixed cylinder is sleeved on the piston, a protrusion is engaged at the position of the axial guide groove.

[0012] In one possible implementation, the rotating structure further includes an annular pad; the front end face of the first tube is provided with an axially recessed annular groove; the annular pad is fixed to one end of the elastic member and rotatably disposed within the annular groove.

[0013] In one possible implementation, the main rotating body further includes multiple fixing bars; the multiple fixing bars are arranged in a circumferential array around the central axis of the main rotating body; the inner wall of the driven rotating body is provided with multiple slots; the positions of the multiple slots correspond one-to-one with the positions of the multiple fixing bars, and each fixing bar is disposed in one of the slots.

[0014] In one possible implementation, when the rotating tooth is located in the second slot, the front end of the piston extends into the inner cavity of the driven rotating body.

[0015] In one possible implementation, when the rotating tooth is engaged in the first slot, the front end face of the piston is located in front of the first grouting hole.

[0016] In one possible implementation, the rear end of the fixed cylinder is provided with a radially extending inner ring; the inner diameter of the inner ring is smaller than the outer diameter of the first boss.

[0017] In one possible implementation, at least one of the fixed cylinder, the limiting cylinder, and the cover plate is fixed to the outer tube by a fixing pin.

[0018] In one possible implementation, the card slot group consists of four groups.

[0019] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0020] The switching device for integrated drilling and grouting construction equipment provided in this application embodiment has a drill bit connected to the front end of the outer tube and a drill rod connected to the rear end. The switching device is installed on the integrated drilling and grouting construction equipment, and the multiple first outlet holes on the front end face of the driven rotating body are aligned with the second outlet holes at the corresponding positions on the cover plate. The multiple first grouting holes on the side wall near the front end of the outer tube are not aligned with the second grouting holes at the corresponding positions on the side wall of the driven rotating body. That is, the outer tube closes the second grouting holes. At this time, flushing fluid is input from the rear end of the outer tube and flushing fluid is output from the front end of the driven rotating body and flows out from the second outlet hole on the cover plate. The construction equipment is in the drilling state and can carry out drilling work. When switching to grouting mode, the rotating structure drives the outer pipe and the driven rotating body to rotate relative to each other. The multiple first grouting holes on the outer pipe align with the corresponding second grouting holes on the driven rotating body. The multiple first outflow holes on the front face of the driven rotating body no longer align with the corresponding second outflow holes on the cover plate; that is, the cover plate closes the first outflow holes. At this time, grout is input from the rear end of the outer pipe, output from the side wall of the driven rotating body, and flows out from the first grouting holes of the outer pipe. The construction equipment is in grouting mode and grouting work can be performed. When switching back to drilling mode, the rotating structure again drives the outer pipe and the driven rotating body to rotate relative to each other, maintaining the alignment of the multiple first outflow holes on the front face of the driven rotating body with the corresponding second outflow holes on the cover plate, and so on. The switching device provided in this embodiment of the invention enables timely switching between drilling and grouting modes according to work requirements during integrated drilling and grouting construction, and also enables timely switching of the injected grout type based on the work mode. At the same time, it can realize the injection of flushing fluid from the drilling direction and the injection of grouting fluid from the side wall of the borehole. It can meet the requirements of timely switching between flushing fluid and grouting fluid and injection into different positions, thereby improving the efficiency and effect of drilling or grouting. It is also suitable for various drilling equipment and has high adaptability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the switching device for integrated drilling and grouting construction equipment provided in an embodiment of this application;

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3A schematic diagram of the structure of the switching device for integrated drilling and grouting construction equipment provided in the embodiments of this application after removing the outer pipe and the fixed cylinder;

[0025] Figure 4 A cross-sectional view of a switching device for an integrated drilling and grouting construction equipment provided in an embodiment of this application;

[0026] Figure 5 Schematic diagram of the structure of the driven rotating body provided in the embodiments of this application Figure 1 ;

[0027] Figure 6 Schematic diagram of the structure of the driven rotating body provided in the embodiments of this application Figure 2 ;

[0028] Figure 7 This is a schematic diagram of the structure of the cover plate provided in an embodiment of this application;

[0029] Figure 8 This is a schematic diagram of the piston structure provided in an embodiment of this application;

[0030] Figure 9 A cross-sectional view of the piston provided in an embodiment of this application;

[0031] Figure 10 Schematic diagram of the structure of the fixed cylinder provided in the embodiments of this application Figure 1 ;

[0032] Figure 11 Schematic diagram of the structure of the fixed cylinder provided in the embodiments of this application Figure 2 ;

[0033] Figure 12 This is a schematic diagram of the structure of the main rotating body provided in the embodiments of this application;

[0034] Figure 13 This is a schematic diagram of the structure of the elastic element and the annular pad provided in the embodiments of this application;

[0035] Figure 14 This application provides a schematic diagram of the installation process of a switching device for integrated drilling and grouting construction equipment. Figure 1 ;

[0036] Figure 15 This application provides a schematic diagram of the installation process of a switching device for integrated drilling and grouting construction equipment. Figure 2 ;

[0037] Figure 16 This application provides a schematic diagram of the installation process of a switching device for integrated drilling and grouting construction equipment. Figure 3 ;

[0038] Figure 17This application provides a schematic diagram of the installation process of a switching device for integrated drilling and grouting construction equipment. Figure 4 ;

[0039] Figure 18 A schematic diagram illustrating the process of a switching device for an integrated drilling and grouting construction equipment, provided in an embodiment of this application, switching from drilling to grouting.

[0040] Figure 19 This is a schematic diagram illustrating the process of a switching device for an integrated drilling and grouting construction equipment, provided in an embodiment of this application, switching from grouting mode to drilling mode.

[0041] Icons: 1-Outer tube; 11-First grouting hole; 2-Driven rotating body; 21-Second grouting hole; 22-First outlet hole; 23-Slot; 3-Cover plate; 31-Second outlet hole; 4-Rotating structure; 41-Piston; 411-Piston cylinder; 412-First boss; 413-Triangular tooth; 414-Baffle; 415-Inlet hole; 416-Protrusion; 42-Fixing cylinder; 421-First slot; 422-Card; 423-Second slot; 424-Axial guide groove; 425-Inner edge ring; 43-Main rotating body; 431-First tube body; 432-Ring groove; 433-Second boss; 434-Second tube body; 435-Rotating tooth; 436-Fixing strip; 44-Elastic element; 45-Limiting cylinder; 46-Circular ring pad. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0044] Please refer to Figures 1-4 As shown, an embodiment of the present invention provides a switching device for an integrated drilling and grouting construction equipment, including an outer pipe 1, a driven rotating body 2, a cover plate 3, and a rotating structure 4.

[0045] The outer tube 1 is a hollow tube, with a drill bit connected to the front end via a thread, and a drill rod connected to the rear end via a thread. Multiple first grouting holes 11 are provided on the side wall near the front end. For example... Figure 1 As shown, the inner wall shape of the front end of the outer tube 1 is adapted to the shape of the drill bit to facilitate locking the drill bit. The inner wall shape of the rear end of the outer tube 1 is adapted to the shape of the drill rod to facilitate locking the drill rod.

[0046] like Figure 5 and Figure 6 As shown, the driven rotating body 2 is a column with a closed front end and an open rear end. The side wall is provided with second grouting holes 21 corresponding to the number and position of the first grouting holes 11. Multiple first outflow holes 22 are provided on the front end face. The first outflow holes are located inside the outer tube 1 and the front end face is close to the front end of the outer tube 1.

[0047] like Figure 7 As shown, the main body of the cover plate 3 is a circular plate. The cover plate 3 is provided with second outflow holes 31 corresponding to the number and position of the first outflow holes 22. It is fixed inside the outer tube 1 and located in front of the driven rotating body 2. The rotating structure 4 is configured to drive the outer tube 1 and the driven rotating body 2 to rotate relative to each other, so that the first grouting hole 11 at the corresponding position is aligned with the second grouting hole 21, or the first outflow hole 22 and the second outflow hole 31 at the corresponding position are aligned.

[0048] The switching device for integrated drilling and grouting construction equipment provided in this application embodiment has a drill bit connected to the front end of the outer pipe 1 and a drill rod connected to the rear end, thereby installing the switching device on the integrated drilling and grouting construction equipment. The multiple first outflow holes 22 on the front end face of the driven rotating body 2 are aligned with the second outflow holes 31 at the corresponding positions on the cover plate 3. The multiple first grouting holes 11 provided on the side wall near the front end of the outer pipe 1 are not aligned with the second grouting holes 21 provided at the corresponding positions on the side wall of the driven rotating body 2. That is, the outer pipe 1 closes the second grouting holes 21. At this time, flushing fluid is input from the rear end of the outer pipe 1 and flushing fluid is output from the front end of the driven rotating body 2 and flows out from the second outflow hole 31 on the cover plate 3. The construction equipment is in the drilling state and can carry out drilling work. When switching to grouting mode, the rotating structure 4 drives the outer pipe 1 and the driven rotating body 2 to rotate relative to each other. The multiple first grouting holes 11 on the outer pipe 1 align with the corresponding second grouting holes 21 on the driven rotating body 2. The multiple first outflow holes 22 on the front end face of the driven rotating body 2 are no longer aligned with the corresponding second outflow holes 31 on the cover plate 3. That is, the cover plate 3 closes the first outflow holes 22. At this time, grout is input from the rear end of the outer pipe 1, and grout is output from the side wall of the driven rotating body 2, flowing out from the first grouting holes 11 of the outer pipe 1. The construction equipment is in grouting mode and grouting work can be performed. When switching back to drilling mode, the rotating structure 4 again drives the outer pipe 1 and the driven rotating body 2 to rotate relative to each other, maintaining the alignment of the multiple first outflow holes 22 on the front end face of the driven rotating body 2 with the corresponding second outflow holes 31 on the cover plate 3, and so on. The switching device provided in this invention enables timely switching between drilling and grouting states during integrated drilling and grouting construction, based on work requirements, and allows for timely switching of the injected grout type according to the working state. Simultaneously, it allows flushing fluid to be delivered to the bottom of the borehole through the drill pipe, while grouting fluid is injected from the sidewall of the borehole. This allows for timely switching between flushing and grouting fluids at different locations, thereby improving the efficiency and effectiveness of drilling or grouting. Furthermore, it is applicable to various drilling equipment and has high adaptability.

[0049] Continue to refer to Figures 1-4 As shown, the rotating structure 4 includes a piston 41, a fixed cylinder 42, a main rotating body 43, an elastic element 44, and a limiting cylinder 45.

[0050] like Figure 8 and Figure 9 As shown, the piston 41 includes a piston cylinder 411, a baffle 414, and a protruding plate 416. The baffle 414 has multiple inlet holes 415 and is fixed to the rear end of the piston cylinder 411. Liquid flows in through the inlet holes 415 and flows out from the front end of the piston cylinder 411. The piston cylinder 411 is tubular in shape, with a radially outward first boss 412 in the middle. The front end of the first boss 412 has continuous triangular teeth 413 evenly distributed circumferentially, and the two tooth surfaces of each triangular tooth 413 have equal lengths. Figure 8and Figure 9 As shown, the thickness of the triangular tooth 413 is less than the thickness of the first boss 412, and a protrusion 416 is provided behind each triangular tooth 413, as shown. Figure 8 As shown, the center line of the protrusion 416 is collinear with the tip of the triangular tooth 413.

[0051] like Figure 10 and Figure 11 As shown, the fixing cylinder 42 includes at least two sets of slots evenly distributed around its circumference. Each set of slots includes a first slot 421, a card 422, and a second slot 423 arranged sequentially. The first slot 421 and the second slot 423 are axially recessed from the front end face of the fixing cylinder 42. The axial depth of the first slot 421 is less than the axial depth of the second slot 423. The end face of the first slot 421 is a bevel, and the end face of the card 422 is a bevel. The number of triangular teeth 413 is twice the number of slot sets.

[0052] like Figure 12 As shown, the main rotating body 43 includes a first tube 431, a second tube 434, and rotating teeth 435. The main body of the main rotating body 43 is tubular, through which liquid can flow, and its maximum outer diameter is the same as the maximum outer diameter of the fixed cylinder 42. The first tube 431 and the second tube 434 are integrally connected, and the outer diameter of the first tube 431 is larger than the outer diameter of the second tube 434. A radially outward second protrusion 433 is provided at the front end of the first tube 431. The number of rotating teeth 435 is the same as the number of slot groups, and they are arranged circumferentially around the central axis of the fixed cylinder 42. One end is fixed to the end face of the second protrusion 433, and the other end is an inclined surface that extends out of the end face of the first tube 431. The thickness is greater than the wall thickness of the slot group of the fixed cylinder 42, and the circumferential width is the same as the circumferential width of the second slot 423 of the fixed cylinder 42. Among them, the tooth surface of the triangular tooth 413 that mates with the rotating tooth 435, the inclined surface of the first slot 421, and the inclined surface of the card 422 are all inclined at the same degree as the inclined surface of the rotating tooth 435, thus adapting to the rotating tooth 435.

[0053] like Figure 1 As shown, the fixed cylinder 42 and the main rotating body 43 are sleeved on the piston 41. A protruding piece 416 is engaged at the position of the second slot 423. Generally, the width of the protruding piece 416 is the same as the width of the second slot 423. The rotating teeth 435 can cooperate with the first slot 421, the card 422 and the second slot 423. The limiting cylinder 45 is located at the rear end of the driven rotating body 2.

[0054] The elastic element 44 is sleeved on the main rotating body 43, with both ends abutting against the limiting cylinder 45 and the main rotating body 43. The main rotating body 43 passes through the limiting cylinder 45 and connects to the driven rotating body 2. The rotating structure 4 is disposed inside the outer tube 1, and both the fixed cylinder 42 and the limiting cylinder 45 are fixed to the outer tube 1. Figure 1 and Figure 13As shown, the elastic element 44 can be a spring.

[0055] The switching device with the aforementioned rotating structure 4 provided in this embodiment of the invention is installed by first inserting the piston 41 into the outer tube 1 from the front end, and then inserting the fixing cylinder 42 into the outer tube 1 to fix the fixing cylinder 42 to the outer tube 1. For example, four pin holes are provided at the rear end of the fixing cylinder 42 and at corresponding positions on the outer tube 1. Fixing pins are inserted into the pin holes at the same positions on the fixing cylinder 42 and the outer tube 1 to completely fix the fixing cylinder 42 to the outer tube 1. The protruding piece 416 provided on the side wall of the first boss 412 of the piston 41 fits perfectly into the second slot 423 at the corresponding position and can move along the second slot 423. Figure 14 As shown. Next, the main rotating body 43 is inserted from the front end of the outer tube 1. The rotating plate of the main rotating body 43 is placed into the second slot 423 at the corresponding position of the fixed cylinder 42. The inclined surface of the rotating plate is engaged with the inclined surface of the triangular tooth 413 on the piston cylinder 411, and the front end of the piston 41 is engaged with the inner cavity of the main rotating body 43, thus realizing the interaction and movement between the main rotating body 43 and the piston 41, as shown. Figure 15 As shown.

[0056] Then, one end of the elastic element 44 is fixed to the end face of the limiting cylinder 45. The elastic element 44 and the limiting cylinder 45 are inserted together from the front end of the outer tube 1. Then, the limiting cylinder 45 is fixed to the outer tube 1. For example, four pin holes are provided on the side wall of the limiting cylinder 45 and at the corresponding positions on the outer tube 1. Fixing pins are inserted into the pin holes at the same positions on the limiting cylinder 45 and the outer tube 1, so that the limiting cylinder 45 can be completely fixed to the outer tube 1. Figure 16 As shown.

[0057] Then, the driven rotating body 2 is inserted from the front end of the outer tube 1, connecting the driven rotating body 2 to the front end of the main rotating body 43. Simultaneously, the second grouting hole 21 on the driven rotating body 2 is aligned with the first grouting hole 11 on the outer tube 1. Figure 17 As shown. Finally, insert the cover plate 3 from the front end of the outer tube 1 and fix the cover plate 3 to the outer tube 1. For example, four pin holes are provided on the side wall of the cover plate 3 and at the corresponding position of the outer tube 1. Insert the fixing pin into the pin hole at the same position of the limiting cylinder 45 and the outer tube 1, so that the cover plate 3 can be completely fixed on the outer tube 1.

[0058] The working state switching process of the switching device for the integrated drilling and injection construction equipment with the above-mentioned rotating structure 4 provided in this embodiment of the invention is as follows.

[0059] During operation, the switching device is switched to the drilling state, meaning the rotating teeth 435 of the main rotating body 43 are engaged in the first slot 421 of the fixed cylinder 42, and the elastic element 44 is in a slightly compressed state. The front end of the outer tube 1 is connected to the drill bit, and the rear end is connected to the drill rod, and drilling begins. After drilling to the designated position, the switching device needs to be switched to the grouting state.

[0060] First, turn off the mud pump, replace the flushing fluid with grouting fluid, then turn the mud pump back on and increase the pump pressure. Figure 18 As shown in (a), the grout flows into the driven rotating body 2 through the inlet hole 415 provided on the baffle 414 of the piston 41, simultaneously pushing the piston 41 forward. The triangular teeth 413 on the piston cylinder 411 of the piston 41 abut against the rotating teeth 435 of the main rotating body 43, pushing the main rotating body 43 forward axially, and the elastic element 44 is gradually compressed. When the main rotating body 43 moves axially until the inclined surface of the rotating teeth 435 is on the same plane as the inclined surface of the card 422 of the fixed cylinder 42, as... Figure 18 As shown in (b), the rotating tooth 435 disengages from the first slot 421, and the sidewall of the first slot 421 no longer circumferentially binds the rotating tooth 435. A circumferential component of the pressure from the triangular tooth 413 causes the rotating tooth 435 to rotate around the axis of the fixed cylinder 42, driving the main rotating body 43 to rotate, thereby driving the driven rotating body 2 to rotate. At this time, the front end face of the first boss 412 of the piston 41 is in contact with the rear end face of the second tube 434 of the main rotating body 43. Of course, as... Figure 18 As shown, due to the inclined plane setting direction of this application, the circumferential component force is in the clockwise direction as shown in the figure. Therefore, the circumferential component force drives the main rotating body 43 to rotate clockwise.

[0061] As the pump pressure decreases, the force on the elastic element 44 decreases, releasing the elastic force. The inclined surface of the card 422 of the fixed cylinder 42 comes into contact with the inclined surface of the rotating tooth 435. At this time, the rotating tooth 435 is subjected to a circumferential component of the pressure from the card 422, causing the rotating tooth 435 to continue rotating around the axis of the fixed cylinder 42, driving the main rotating body 43 to rotate, thereby driving the driven rotating body 2 to rotate. The rear end face of the main rotating body 43 provides a thrust to the front end face of the piston 41, pushing the piston 41 to move axially backward at the same time.

[0062] When the main rotating body 43 rotates until the inclined surface of the rotating tooth 435 is on the same plane as the inclined surface of the card 422 of the fixed cylinder 42 and is within the circumferential range of the second card slot 423, such as Figure 18As shown in (c), the rotating tooth 435 of the main rotating body 43 is engaged in the second slot 423 of the fixed cylinder 42. The rotating tooth 435 moves axially along the direction of the second slot 423 and no longer rotates. At this time, the tooth surface of the triangular tooth 413 is in contact with the inclined surface of the rotating tooth 435. Under the action of the elastic force of the elastic element 44, the main rotating body 43 continues to push the piston 41 to move axially backward. At the same time, the first grouting hole 11 on the outer tube 1 and the second grouting hole on the driven rotating body 2 gradually align to form a passage. The first outlet hole 22 on the driven rotating body 2 and the second outlet hole 31 on the cover plate 3 gradually shift away, and the passage is broken. Figure 18 As shown in (d). Finally, the elastic force of the elastic element 44 continues to push the main rotating body 43 and the piston 41 to move backward along the axial direction. The rotating teeth 435 of the main rotating body 43 are fully engaged in the second slot 423 of the fixed cylinder 42. The first grouting hole 11 on the outer tube 1 is fully aligned with the second grouting hole on the driven rotating body 2. The grouting liquid flows out from the second grouting hole 21 of the outer tube 1, completing the conversion of the grouting working state.

[0063] When switching from grouting to drilling, first turn off the mud pump, replace the grouting fluid with flushing fluid, then turn the mud pump back on and increase the pump pressure. The grouting fluid flows into the driven rotating body 2 through the inlet hole 415 on the baffle 414 of the piston 41, simultaneously pushing the piston 41 forward. The triangular teeth 413 on the piston cylinder 411 of the piston 41 abut against the rotating teeth 435 of the main rotating body 43, pushing the main rotating body 43 forward axially. The elastic element 44 is gradually compressed, such as... Figure 19 As shown in (a). When the main rotating body 43 moves axially until the inclined surface of the rotating tooth 435 is on the same plane as the inclined surface of the first slot 421 of the next slot group of the fixed cylinder 42, as... Figure 19 As shown in (b), the rotating tooth 435 disengages from the second slot 423, and the sidewall of the second slot 423 no longer circumferentially binds the rotating tooth 435. A circumferential component of the pressure from the triangular tooth 413 causes the rotating tooth 435 to rotate around the axis of the fixed cylinder 42, driving the main rotating body 43 to rotate, thereby driving the driven rotating body 2 to rotate. Reducing the pump pressure decreases the force on the elastic element 44, releasing the elastic force. The inclined surface of the first slot 421 contacts the inclined surface of the rotating tooth 435. At this time, a circumferential component of the pressure from the inclined surface of the first slot 421 causes the rotating tooth 435 to continue rotating around the axis of the fixed cylinder 42, driving the main rotating body 43 to rotate, thereby driving the driven rotating body 2 to rotate.

[0064] When the main rotating body 43 rotates until the side surface of the rotating tooth 435 is in contact with both the inclined surface and the side surface of the first slot 421, the main rotating body 43 stops rotating. At this time, the tooth surface of the triangular tooth 413 and the inclined surface of the first slot 421 are in contact with the inclined surface of the rotating tooth 435. At the same time, the first outlet hole 22 on the driven rotating body 2 and the second outlet hole 31 on the cover plate 3 form a passage, and the first grouting hole 11 on the outer pipe 1 is offset from the second grouting hole on the driven rotating body 2, thus breaking the passage. Figure 19 As shown in (c), the flushing fluid flows out from the second outlet hole 31 of the cover plate 3 and flows into the drill bit before flowing out, completing the transition of the drilling working state.

[0065] The rotating structure 4 provided in this application simplifies the switching process of the switching device. The working state can be switched by controlling the pump pressure of the mud pump, which is convenient, quick and easy to control. It is also applicable to various drilling equipment and has strong applicability.

[0066] Of course, the rotating structure 4 can also be a clamp and a rotary motor. The clamp is clamped to the outer tube 1, and the rotary motor drives the clamp to rotate, thereby realizing the rotation of the outer tube 1 relative to the driven rotating body 2.

[0067] like Figure 10 and Figure 11 As shown, an axial guide groove 424 is provided on the inner wall of the first slot 421 of the fixed cylinder 42. When the fixed cylinder 42 is sleeved on the piston 41, a protrusion 416 is engaged at the position of the axial guide groove 424. Generally, the width of the axial guide groove 424 is the same as the width of the protrusion 416. The cooperation of the axial guide groove 424 and the protrusion 416 can further guide the axial movement of the piston 41. Moreover, at this time, the circumferential width of the card 422 and the circumferential width of the second slot 423 are set to be the same, and the circumferential width of the first slot 421 is set to be twice the circumferential width of the second slot 423. The axial guide groove 424 is adjacent to the card 422, and its circumferential width is the same as the width of the card 422. The number of protrusions 416 is twice the number of guide groove groups. The protrusions 416 are evenly distributed and spaced on the outer wall of the first boss 412 of the piston 41, which is more convenient to manufacture.

[0068] like Figure 13As shown, the rotating structure 4 also includes an annular pad 46. The front end face of the first tube 431 of the main rotating body 43 is provided with an axially recessed annular groove 432. The annular pad 46 is fixed to one end of the elastic member 44 and rotatably disposed within the annular groove 432, thus enabling circumferential relative rotation between the main rotating body 43 and the annular pad 46. In practice, when the main rotating body 43 rotates, if one end of the elastic member 44 abuts against the main rotating body 43, the force required to rotate the main rotating body 43 will increase. However, since the annular pad 46 is rotatably disposed within the annular groove 432 on the front end face of the first tube 431 of the main rotating body 43, when the main rotating body 43 rotates, the elastic member 44 itself remains stationary but can rotate relative to the main rotating body 43, thus making it easier for the main rotating body 43 to achieve the required rotation force and making rotation more flexible.

[0069] like Figure 12 As shown, the main rotating body 43 also includes multiple fixing bars 436. The number of fixing bars 436 can be two, three, four, etc. In this embodiment, the main rotating body 43 has eight fixing bars 436. The fixing bars 436 are quadrangular prisms. The multiple fixing bars 436 are arranged in a circumferential array around the central axis of the main rotating body 43.

[0070] like Figure 6 As shown, the inner wall of the driven rotating body 2 is provided with multiple slots 23. The positions of the multiple slots 23 correspond one-to-one with the positions of multiple fixing bars 436, with each fixing bar 436 disposed in one slot 23. When there are eight fixing bars 436, the corresponding number of slots 23 is also eight. The arrangement of fixing bars 436 and slots 23 in this embodiment of the application is simple in structure and can realize axial sliding between the main rotating body 43 and the driven rotating body 2 when the main rotating body 43 moves axially. At the same time, when the main rotating body 43 rotates, the side wall of the slot 23 pushes the side wall of the fixing bar 436, thereby causing the main rotating body 43 to drive the driven rotating body 2 to rotate circumferentially.

[0071] like Figure 6 As shown, multiple slots 23 are provided only on the inner wall of the front end of the driven rotating body 2, thereby reducing the axial length of the slots 23 and reducing the frictional force when the main rotating body 43 and the driven rotating body 2 slide axially.

[0072] Furthermore, when the rotating tooth 435 is located in the second slot 423, the front end of the piston 41 extends into the inner cavity of the driven rotating body 2, so that when the grout is injected, the grout flows into the driven rotating body 2 and does not fill the inner cavity of the main rotating body 43 located at the rear end of the driven rotating body 2, thereby not increasing the weight of the main rotating body 43, and consequently not increasing the force required to rotate the main rotating body 43.

[0073] Optionally, when the rotating tooth 435 is engaged in the first slot 421, the front end face of the piston 41 is located in front of the first grouting hole 11, so that the piston 41 can close the second grouting hole 21 again. The outer tube 1 and the piston 41 provide double closure of the second grouting hole 21, thereby improving the sealing effect of the second grouting hole 21.

[0074] Continue to refer to Figure 10 As shown, the rear end of the fixed cylinder 42 is provided with a radially extending inner ring 425. The inner diameter of the inner ring 425 is smaller than the outer diameter of the first boss 412, so that when the piston 41 moves backward, the inner ring 425 restricts the first boss 412 from continuing to move, thus limiting the piston 41.

[0075] like Figure 1 As shown, at least one of the fixing cylinder 42, the limiting cylinder 45, and the cover plate 3 is fixed to the outer tube 1 by a fixing pin. Specifically, as... Figure 10 As shown, the rear end of the fixed cylinder 42 has four pin holes evenly distributed along its circumference, as... Figure 1 As shown, the side wall of the limiting cylinder 45 is provided with four pin holes evenly distributed along its circumference, such as... Figure 7 As shown, the side wall of the cover plate 3 is provided with pin holes. Of course, the corresponding positions of the outer tube 1 that fix the cover plate 3, the limiting cylinder 45, and the fixing cylinder 42 are also provided with pin holes. The fixing cylinder 42, the limiting cylinder 45, and the cover plate 3 can be quickly and securely fixed to the outer tube 1 by means of fixing pins.

[0076] like Figure 10 and Figure 11 As shown, there are four sets of slots. With four sets, the corresponding number of the first grouting hole 11 and the second grouting hole 21, the first outlet hole 22 and the second outlet hole 31 are all set to four, thus increasing the number of grouting and outlet holes and improving grouting and drilling efficiency. There are eight triangular teeth 413 and eight protruding pieces 416. Of course, the slots can also be set to two, three, or five sets, etc. With fewer slots, the main rotating body 43 needs to traverse a longer circumferential path, requiring a larger pump pressure differential and greater elastic force from the elastic element 44, necessitating a longer axial length and increasing the assembly and manufacturing difficulty of the device. Conversely, with more slots, the overall manufacturing difficulty of the rotating structure 4 increases. A four-slot configuration allows for better control of the pump pressure differential, makes it easier to set the length of the elastic element 44, and provides a suitable level of manufacturing difficulty for the rotating structure 4.

[0077] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0078] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A switching device for integrated drilling and grouting construction equipment, characterized in that, Includes an outer tube, a driven rotating body, a cover plate, and a rotating structure; The front end of the outer tube is connected to the drill bit, and the rear end is connected to the drill rod. Multiple first grouting holes are provided on the side wall near the front end. The driven rotating body is a column with a closed front end and an open rear end. The side wall is provided with second grouting holes corresponding to the number and position of the first grouting holes. Multiple first outflow holes are provided on the front end face. The body is located inside the outer tube and the front end face is close to the front end of the outer tube. The cover plate is provided with a second outlet hole corresponding to the number and position of the first outlet hole, which is fixed inside the outer tube and located in front of the driven rotating body; The rotating structure is configured to drive the outer tube and the driven rotating body to rotate relative to each other, so that the first grouting hole and the second grouting hole at the corresponding position are aligned or the first outlet hole and the second outlet hole at the corresponding position are aligned. The rotating structure includes a piston, a fixed cylinder, a main rotating body, an elastic element, and a limiting cylinder; The piston includes a piston cylinder, a baffle, and a protruding plate; The baffle is provided with multiple flow inlets and is fixed to the rear end of the piston cylinder; The piston cylinder has a first radially outward protrusion in the middle. The front end of the first boss is evenly distributed with continuous triangular teeth along the circumference. The thickness of the triangular teeth is less than the thickness of the first boss. A protruding piece is provided behind each triangular tooth. The center line of the protruding piece is collinear with the tooth tip of the triangular tooth. The fixed cylinder includes at least two sets of slots evenly distributed around its circumference; Each group of card slots includes a first card slot, a card, and a second card slot arranged sequentially. The first slot and the second slot are axially recessed from the front end face of the fixed cylinder. The axial depth of the first slot is less than the axial depth of the second slot. The end face of the first slot is a slope, and the end face of the card is a slope. The number of triangular teeth is twice the number of slot groups; The main rotating body includes a first tube, a second tube, and rotating teeth; The first tube and the second tube are integrally connected, and the outer diameter of the first tube is larger than the outer diameter of the second tube; The front end of the first tube is provided with a second protrusion facing outwards radially; The number of rotating teeth is the same as the number of slot groups, and they are arranged circumferentially around the central axis of the fixed cylinder. One end is fixed to the end face of the second boss, and the other end is an inclined surface that extends out of the end face of the first tube body. The thickness is greater than the wall thickness of the slot group of the fixed cylinder. The fixed cylinder and the main rotating body are sleeved on the piston, and a protruding piece is engaged at the position of the second slot. The rotating teeth can cooperate with the first slot, the card, and the second slot. The limiting cylinder is disposed at the rear end of the driven rotating body; The elastic element is sleeved on the main rotating body, and its two ends abut against the limiting cylinder and the main rotating body; The main rotating body passes through the limiting cylinder and is connected to the driven rotating body; The rotating structure is disposed inside the outer tube, and both the fixed cylinder and the limiting cylinder are fixed to the outer tube.

2. The switching device for integrated drilling and grouting construction equipment according to claim 1, characterized in that, An axial guide groove is provided on the inner wall at the position corresponding to the first slot of the fixed cylinder. When the fixed sleeve is fitted onto the piston, a protruding piece is engaged at the position of the axial guide groove.

3. The switching device for integrated drilling and grouting construction equipment according to claim 1 or 2, characterized in that, The rotating structure also includes a circular pad; The front end face of the first tube is provided with an axially recessed annular groove; The annular pad is fixed to one end of the elastic member and rotatably disposed within the annular groove.

4. The switching device for integrated drilling and grouting construction equipment according to claim 1, characterized in that, The main rotating body also includes multiple fixing bars; The fixed bars are arranged in a circumferential array around the central axis of the main rotating body; The inner wall of the driven rotating body is provided with multiple slots; The positions of the multiple slots correspond one-to-one with the positions of the multiple fixing strips, and each fixing strip is disposed in one of the slots.

5. The switching device for integrated drilling and grouting construction equipment according to claim 1, characterized in that, When the rotating tooth is located in the second slot, the front end of the piston extends into the inner cavity of the driven rotating body.

6. The switching device for integrated drilling and grouting construction equipment according to claim 5, characterized in that, When the rotating tooth is engaged in the first slot, the front end face of the piston is located in front of the first grouting hole.

7. The switching device for integrated drilling and grouting construction equipment according to claim 1, characterized in that, The rear end of the fixed cylinder is provided with an inner ring along the radial direction; The inner diameter of the inner ring is smaller than the outer diameter of the first boss.

8. The switching device for integrated drilling and grouting construction equipment according to claim 1, characterized in that, At least one of the fixed cylinder, the limiting cylinder, and the cover plate is fixed to the outer tube by a fixing pin.

9. The switching device for integrated drilling and grouting construction equipment according to claim 1, characterized in that, The card slot group consists of four groups.

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