Two-way self-locking transmission wired drill pipe for underground coal mine directional drilling and method

Abstract

The application provides a bidirectional self-locking transmission wired drill rod for underground directional drilling of a coal mine and a method, a tight transmission assembly capable of reciprocating in an axial direction is coaxially arranged in a drill rod body, a reciprocating seat, a limiting shaft and two or more positioning balls are arranged at a front end of the drill rod body, the reciprocating seat reciprocates by pushing the tight transmission assembly; a locking seat is arranged at a rear end of the drill rod, an arc-shaped groove corresponding to the positioning ball is arranged at a rear part of an outer wall of a locking shaft of the locking seat; the locking shaft can be inserted into the limiting shaft to a state in which a positioning bin and the arc-shaped groove are radially aligned, a radially inner side of the positioning ball can be exposed to the limiting shaft and enter the arc-shaped groove, and a first thrust boss and a second thrust seat can contact the limiting, so as to realize bidirectional self-locking. The application adopts technical means of floating connection, axial limiting and root-by-root locking and unlocking, so as to realize lossless flexible connection of a transmission assembly of the wired drill rod, bidirectional rotary self-locking and bidirectional power transmission.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal mine underground tunnel drilling, and relates to a wired transmission drill rod, in particular to a bidirectional self-locking transmission wired transmission drill rod for coal mine underground directional drilling and a method. BACKGROUND

[0002] The drill rod is one of important components of the coal mine underground directional drilling equipment, which mainly plays functions of transmitting the drilling power of the drilling machine, conveying the flushing fluid provided by the mud pump, and assisting the borehole-in and borehole-out data communication of the measurement-while-drilling system.

[0003] The wired transmission drill rod is a special drill rod used in cooperation with the wired measurement-while-drilling system, and currently mainly adopts a center cable passing structure. For example, the authorized invention patent ZL200710018252.7 realizes high-speed transmission of the borehole-in and borehole-out bidirectional signals, but has the following disadvantages in actual use.

[0004] (A) High failure rate of hard connection of the center cable passing device. When the existing wired transmission drill rod is connected, the drill rod body and the center cable passing device are synchronously connected, and the center cable passing device needs to bear a large torque and thrust force, so that the connection is easily damaged, resulting in a high overall failure rate of the drill rod and affecting the transmission stability.

[0005] (B) Easy loosening of the drill rod connection. The existing wired transmission drill rod is connected by using the male thread and the female thread at both ends of the drill rod body, and the male thread and the female thread generally adopt a normal thread. When the drill rod is rotated in the normal direction, the thread connection is firm, but when the drill rod is rotated in the reverse direction for disassembly or is alternately rotated in the normal direction and the reverse direction for drag reduction drilling in the long hole, the thread of the drill rod in the hole is easily loosened, resulting in accidents such as drill rod falling in the hole.

[0006] (C) Low accident handling capacity. In the directional drilling construction process, accidents such as hole sticking and drill sticking are inevitable. The existing wired transmission drill rod only has a normal direction rotation transmission function, and cannot meet the needs of normal direction and reverse direction alternating rotation vibration for unblocking and reverse rotation of all drill tools for drill pulling out, so that the accident handling means is single, the handling cost is high, and the success rate is low. SUMMARY

[0007] In view of the disadvantages of the prior art, the purpose of the present application is to provide a bidirectional self-locking transmission wired transmission drill rod for coal mine underground directional drilling and a method, so as to solve the technical problems of high failure rate of hard connection of the center cable passing device, easy loosening of the drill rod connection, and low accident handling capacity of the wired transmission drill rod for coal mine underground directional drilling in the prior art.

[0008] In order to solve the above technical problems, the present application adopts the following technical solutions:

[0009] The utility model provides a kind of two-way self-locking transmission wired drill rod for coal mine underground directional drilling, including hollow drill rod body, flow passage is provided in the drill rod body, the front end of the drill rod body is provided with male joint, the rear end of drill rod body is provided with female joint.

[0010] The inside of the drill rod body is divided into first section, second section, third section, fourth section, fifth section and sixth section in sequence from front end to rear end, sixth section and female joint are communicated, the inner diameter of first section, second section, third section and fourth section decreases in sequence, the inner diameter of fourth section, fifth section, sixth section and female joint increases in sequence.

[0011] Coaxial tight transmission assembly capable of reciprocating in axial direction is arranged in the drill rod body, and the tight transmission assembly passes through the fourth section, and the tight transmission assembly includes first thrust seat, hollow inner tube and second thrust seat connected in sequence from front to back.

[0012] First support ring is installed in the third section, and second support ring is installed in the fifth section, and the second support ring is locked by locking seat installed in the sixth section;The hollow inner tube is supported by the first support ring and the second support ring and can reciprocate in axial direction relative to the first support ring and the second support ring;The first thrust seat is located at the front end of the first support ring, and an elastomer is arranged between the first thrust seat and the first support ring;The second thrust seat is located at the rear end of the second support ring, and the second thrust seat is located in the locking seat.

[0013] Limiting ball seat is installed in the first section, and the limiting ball seat includes hollow limiting shaft, the both ends of the limiting shaft are open, the outer wall of the limiting shaft is provided with annular first limiting boss extending outward at the front, and the inner wall of the limiting shaft is provided with annular first thrust boss extending inward at the rear;Two or more positioning cavities are formed in the limiting shaft, and the positioning cavities are distributed equidistantly along the circumference, and the positioning cavities are radially communicated between the outer part and the inner part of the limiting shaft.

[0014] Positioning ball is installed in the positioning cavity, and the positioning ball can move radially in the positioning cavity, and the radial inner side of the positioning ball can be exposed to the inside of the limiting shaft;Reciprocating seat is installed in the second section, and the radial movement of the positioning ball can drive the axial movement of the reciprocating seat, and the reciprocating seat drives the movement of the tight transmission assembly by pushing the first thrust seat.

[0015] The locking seat includes hollow locking shaft, and the outer wall of the locking shaft is provided with arc-shaped groove corresponding to the positioning ball at the rear;The locking shaft is inserted into the limiting shaft to the state that the positioning cavity and the arc-shaped groove are radially aligned, the radial inner side of the positioning ball can be exposed to the inside of the limiting shaft and enter the arc-shaped groove, and the first thrust boss and the second thrust seat can contact the limiting, to realize two-way self-locking.

[0016] The application also has the following technical features:

[0017] The first limiting boss is provided with a male thread, and the first segment is provided with a female thread on the inner wall, and the first segment is fixedly connected with the first limiting boss through the threads.

[0018] The reciprocating seat comprises a hollow reciprocating shaft, the two ends of the reciprocating shaft are open, the inner wall of the reciprocating shaft is provided with an annular second thrust boss extending inward at the rear, and the second thrust boss can apply a thrust force to the first thrust seat; the front end of the reciprocating shaft is a guide table, and an arc table is arranged in the reciprocating shaft and is in contact with the positioning ball to limit the reciprocating seat.

[0019] The locking shaft is open at both ends, the outer wall of the locking shaft is provided with a connecting boss extending outward at the front, and the connecting boss is installed in the sixth segment; the connecting boss is provided with a male thread, and the inner wall of the sixth segment is provided with a female thread, and the sixth segment is fixedly connected with the connecting boss through the threads.

[0020] The first thrust seat is provided with a male plug, and the male plug is provided with a conical spring; the second thrust seat is provided with a female socket; the hollow inner tube is provided with a wire, and the wire electrically communicates the male plug and the female socket.

[0021] The first thrust seat comprises a hollow first thrust seat body, the inner wall of the first thrust seat body is provided with a thread connected with the male plug at the front end, the inner wall of the first thrust seat body is provided with a thread connected with the hollow inner tube at the rear end, the outer wall of the first thrust seat body is provided with a second limiting boss, and the second limiting boss is connected with a third thrust boss through two or more first supporting ribs.

[0022] The second thrust seat comprises a hollow second thrust seat body; the inner wall of the second thrust seat body is provided with a thread connected with the hollow inner tube at the front end, the inner wall of the second thrust seat body is provided with a thread connected with the female socket at the rear end, the outer wall of the second thrust seat body is provided with a third limiting boss, and the third limiting boss is connected with a fourth thrust boss through two or more second supporting ribs.

[0023] The application also protects a use method of the bidirectional self-locking transmission wired drill rod for underground directional drilling of a coal mine, which comprises the following steps:

[0024] Step one, initial state:

[0025] Before the drill rod is used, the first thrust seat and the reciprocating seat of the transmission assembly are located at the front end under the elastic force of the elastic body, and the positioning ball is exposed from the bottom of the positioning cavity of the limiting ball seat under the limitation of the reciprocating seat.

[0026] Step two, drill rod installation:

[0027] The outer wall of the male joint is machined with a male thread, and the inner wall of the female joint is machined with a female thread; for the adjacent front drill pipe and rear drill pipe to be connected, the drill pipe clamp of the drilling machine clamps the front drill pipe, the power head of the drilling machine rotates the rear drill pipe in the forward direction, the female thread of the female joint of the rear drill pipe is connected with the male thread of the male joint of the front drill pipe, the locking shaft of the locking seat of the front drill pipe pushes the positioning ball of the rear drill pipe to move radially outward to retract the positioning cavity, and the positioning ball of the rear drill pipe pushes the reciprocating seat and the first thrust seat of the rear drill pipe to move backward, compressing the elastic body and moving the whole transmission assembly backward.

[0028] After the female thread of the female joint of the rear drill pipe is connected with the male thread of the male joint of the front drill pipe, the positioning cavity of the limiting ball seat of the rear drill pipe is opposite to the arc-shaped groove on the locking seat of the front drill pipe, the elastic body of the rear drill pipe pushes the first thrust seat and the reciprocating seat of the rear drill pipe to move forward, so that the positioning ball moves radially inward to expose the positioning cavity and enter the arc-shaped groove; at the same time, the first thrust boss of the limiting ball seat of the rear drill pipe is in contact with the fourth thrust boss of the second thrust seat of the front drill pipe, the fastening transmission assembly of the front drill pipe is limited and cannot move axially; the fastening transmission assembly of the rear drill pipe is not limited and can move axially.

[0029] Step three, drill pipe locking:

[0030] After repeating step two to complete the addition of all drill pipes, a fastening water feeder is added to the tail of the last drill pipe, the inner core of the fastening water feeder is in contact with the second thrust seat of the last drill pipe, and the fastening transmission assembly of the last drill pipe is limited and cannot move axially; at this time, the fastening transmission assemblies of the first drill pipe to the last drill pipe are all limited and cannot move axially, and the connection between the first drill pipe and the last drill pipe is all locked.

[0031] Step four, directional drilling or accident handling:

[0032] The drill pipe is rotated by the drilling machine in the forward direction, in the reverse direction, or in the alternating forward and reverse directions to perform directional drilling or in-hole accident handling.

[0033] Step five, drill pipe unlocking:

[0034] The fastening water feeder is removed from the tail of the last drill pipe, the fastening transmission assembly of the last drill pipe is unblocked and restores the axial movement function; the fastening transmission assemblies of the remaining drill pipes continue to be blocked and remain in the locked state.

[0035] Step six, drill pipe disassembly:

[0036] The front drill rod is clamped using the drill rig chuck, and the rear drill rod is rotated in the opposite direction using the drill rig power head. The female thread of the rear drill rod disengages from the male thread of the front drill rod. The locking shaft of the front drill rod locking seat pushes the positioning ball of the rear drill rod to move outward and retract into the positioning chamber. The positioning ball of the rear drill rod pushes its reciprocating seat and the first thrust seat to move backward, compressing the elastic body, and the entire tightening transmission assembly moves backward. At the same time, the first thrust boss of the limiting ball seat of the rear drill rod gradually disengages from the fourth thrust boss of the second thrust seat of the front drill rod. The tightening transmission assembly of the front drill rod is released from its limit and restores its axial movement function. After the threads are untangled, the rear drill rod is removed from the drill rig.

[0037] In step two, after the female thread of the rear drill rod is connected to the male thread of the front drill rod, the male plug of the rear drill rod enters the second thrust seat of the front drill rod, the conical spring of the rear drill rod contacts the female socket of the front drill rod, and the locking transmission assembly of the rear drill rod and the locking transmission assembly of the front drill rod are electrically connected to form a wired signal transmission channel inside and outside the hole.

[0038] Step four includes three operating conditions: forward rotary transmission, reverse rotary transmission, and alternating forward and reverse rotary transmission.

[0039] The aforementioned forward rotary transmission condition:

[0040] When the drilling rig rotates the drill rod in the forward direction, the adjacent drill rods with positive thread connection continue to maintain a tight connection and transmit the forward rotation power to the bottom of the hole.

[0041] The aforementioned reverse rotary transmission condition:

[0042] When the drill rod reverses, the connecting threads of adjacent drill rods are subjected to loosening torque, causing them to tend to separate. Under the pressure of the tightening transmission component, the reciprocating seat keeps the positioning ball within the locking seat. There is no relative movement between the locking seat and the positioning ball. Adjacent drill rods lack loosening space and continue to maintain a tight connection, transmitting the reverse rotation power to the bottom of the hole.

[0043] The aforementioned alternating forward and reverse rotation transmission condition:

[0044] When the drill rod is rotated alternately in both forward and reverse directions, adjacent drill rods remain tightly connected in the forward rotation and in the reverse rotation, and the power of the alternating forward and reverse rotation is transmitted to the bottom of the hole.

[0045] Compared with the prior art, the present invention has the following technical effects:

[0046] (I) The application adopts the technical means of floating connection, axial limiting and root-by-root locking and unlocking, realizes the lossless flexible connection, bidirectional rotary self-locking and bidirectional power transmission of the wired transmission drill rod transmission assembly, improves the working reliability and use safety of the wired transmission drill rod, and provides protection for the super-long directional hole construction and hole accident prevention and treatment.

[0047] (II) The signal transmission assembly of the application is lossless and flexible. The fastening transmission assembly of the drill rod can move axially in the drill rod body. During the drill rod adding process, the fastening transmission assembly of the rear drill rod moves backward and does not contact the fastening transmission assembly of the front drill rod. After the drill rod is added, the fastening transmission assembly of the front drill rod is locked by the limiting ball seat of the rear drill rod, and under the action of the elastic body, the fastening transmission assembly of the rear drill rod moves forward and contacts the fastening transmission assembly of the front drill rod, but the fastening transmission assembly of the rear drill rod is not locked. During the whole drill rod adding process, the fastening transmission assembly of the drill rod does not bear the connection torque and propelling force of the drill rod, thereby improving the service life of the fastening transmission assembly and the stability of signal transmission.

[0048] (III) The drill rod of the application is connected and fastened during forward and reverse rotation. The locking seat of the front drill rod cooperates with the limiting ball seat, the positioning ball and the reciprocating seat of the rear drill rod to axially limit and lock the connecting thread between the adjacent drill rods, so that the adjacent drill rods lack a loosening space and are always in a fastened connection state during forward and reverse rotation.

[0049] (IV) The drill rod locking of the application does not affect the drill rod disassembly. During the drill rod adding process, the drill rods are locked root by root, and after each drill rod is added, the previous drill rod is locked, and the last drill rod remains unlocked. During the drill rod disassembly process, the drill rods are unlocked root by root, and after each drill rod is disassembled, the previous drill rod is unlocked, and the remaining drill rods remain locked, so that the drill rod loosening does not occur during the disassembly process.

[0050] (V) The automatic locking and unlocking of the application has high reliability. The drill rod mainly relies on the axial movement of the reciprocating seat and the fastening transmission assembly for axial limiting, root-by-root locking and root-by-root unlocking, and the power mainly comes from the spatial installation relationship of the limiting ball seat, the first thrust seat and the second thrust seat and the elastic force of the elastic body, so that the locking and unlocking have high reliability and stability without external power. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 is the overall cross-sectional structural schematic diagram of the bidirectional self-locking transmission wired drill rod for directional drilling in a coal mine.

[0052] Figure 2 is the cross-sectional structural schematic diagram of the drill rod body.

[0053] Figure 3 is the cross-sectional structural schematic diagram of the limiting ball seat.

[0054] Figure 4 yes Figure 3 A schematic diagram of the AA section structure.

[0055] Figure 5 This is a cross-sectional structural diagram of the reciprocating seat.

[0056] Figure 6 This is a cross-sectional view of the locking seat.

[0057] Figure 7 This is a cross-sectional structural diagram of the fixed transmission component.

[0058] Figure 8 This is a front sectional view of the first thrust seat.

[0059] Figure 9 This is a schematic diagram of the left-hand structure of the first thrust seat.

[0060] Figure 10 This is a front sectional view of the second thrust seat.

[0061] Figure 11 This is a schematic diagram of the left-hand structure of the second thrust seat.

[0062] Figure 12 This is a schematic diagram of the connection structure of a bidirectional self-locking wired transmission drill rod used for directional drilling in multiple coal mines.

[0063] Figure 13 yes Figure 12 A magnified view of a portion of the drill pipe connection.

[0064] The meanings of the labels in the figure are as follows: 1-Drill pipe body, 2-Limit ball seat, 3-Positioning ball, 4-Reciprocating seat, 5-Locking seat, 6-First support ring, 7-Second support ring, 8-Fixed transmission assembly, 9-Flow channel.

[0065] 101-Male connector, 102-Female connector, 103-First segment, 104-Second segment, 105-Third segment, 106-Fourth segment, 107-Fifth segment, 108-Sixth segment.

[0066] 201-Limiting shaft, 202-First limiting boss, 203-First thrust boss, 204-Positioning chamber.

[0067] 501 - Locking shaft, 502 - Connecting boss, 503 - Arc groove.

[0068] 401-Reciprocating shaft, 402-Second thrust boss, 403-Guide platform, 404-Arc-shaped platform.

[0069] 801-First thrust seat, 802-Hollow inner tube, 803-Second thrust seat, 804-Male plug, 805-Conical spring, 806-Female socket, 807-Elastomer, 808-Wire.

[0070] 80101 - First thrust seat, 80102 - Second limiting boss, 80103 - First support rib, 80104 - Third thrust boss.

[0071] 80301 - Second thrust seat, 80302 - Third limiting boss, 80303 - Second support rib, 80304 - Fourth thrust boss.

[0072] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0073] It should be noted that, unless otherwise specified, all components and devices in this invention are based on components and devices known in the prior art. For example, the drilling rig and the water supply fastener are both based on devices known in the art.

[0074] In view of the deficiencies mentioned in the background art, this invention addresses the shortcomings of current wired transmission drill rods used in underground directional drilling in coal mines, such as high failure rate of the hard connection of the central cable device, easy loosening of drill rod connections, and low accident handling capability. Therefore, this invention researches and designs a bidirectional self-locking wired transmission drill rod and method for underground directional drilling in coal mines to overcome the aforementioned deficiencies.

[0075] The drill rod of this invention includes a drill rod body, a limiting ball seat, a positioning ball, and a reciprocating seat disposed at the front end inside the drill rod body, a locking seat disposed at the rear end inside the drill rod body, and a tightening transmission assembly centrally disposed in the middle of the drill rod body and capable of axial movement. During drill rod installation, from front to back, the positioning ball, locking seat, reciprocating seat, and tightening transmission assembly of each drill rod are locked one by one, and the tightening transmission assemblies of each drill rod are connected to form a wired signal transmission channel. After the drill rod is locked, it maintains a tight connection under forward rotation, reverse rotation, and alternating forward and reverse rotation conditions, transmitting power in both forward and reverse directions. During drill rod disassembly, from back to front, the positioning ball, locking seat, reciprocating seat, and tightening transmission assembly of each drill rod are unlocked one by one. This invention achieves bidirectional self-locking and power transmission while simultaneously transmitting drill rod signals via wired connection, improving the working reliability and safety of the drill rod, and providing assurance for ultra-long directional hole construction and prevention and handling of in-hole accidents.

[0076] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0077] Example 1:

[0078] This embodiment provides a bidirectional self-locking wired transmission drill rod for directional drilling in coal mines, such as... Figure 1 As shown, the drill pipe body 1 is hollow, and a flow channel 9 is provided inside the drill pipe body 1. A male connector 101 is provided at the front end of the drill pipe body 1, and a female connector 102 is provided at the rear end of the drill pipe body 1.

[0079] like Figure 2 As shown, the interior of the drill pipe body 1 is divided into a first section 103, a second section 104, a third section 105, a fourth section 106, a fifth section 107, and a sixth section 108 that are connected sequentially from the front end to the rear end. The sixth section 108 is connected to the female connector 102. The inner diameters of the first section 103, the second section 104, the third section 105, and the fourth section 106 decrease sequentially, while the inner diameters of the fourth section 106, the fifth section 107, the sixth section 108, and the female connector 102 increase sequentially.

[0080] like Figure 1 and Figure 7 As shown, a retaining transmission assembly 8 capable of axial reciprocating motion is coaxially arranged inside the drill pipe body 1. The retaining transmission assembly 8 passes through the fourth section 106. The retaining transmission assembly 8 includes a first thrust seat 801, a hollow inner tube 802, and a second thrust seat 803 connected sequentially from front to back.

[0081] like Figure 1 As shown, a first support ring 6 is installed in the third segment 105, and a second support ring 7 is installed in the fifth segment 107. The second support ring 7 is locked by a locking seat 5 installed in the sixth segment 108. The hollow inner tube 802 is supported by the first support ring 6 and the second support ring 7 and can reciprocate axially relative to the first support ring 6 and the second support ring 7. The first thrust seat 801 is located at the front end of the first support ring 6, and an elastic body 807 is provided between the first thrust seat 801 and the first support ring 6. The second thrust seat 803 is located at the rear end of the second support ring 7 and is located in the locking seat 5.

[0082] like Figure 3 and Figure 4 As shown, a limiting ball seat 2 is installed in the first segment 103. The limiting ball seat 2 includes a hollow limiting shaft 201. Both ends of the limiting shaft 201 are open. The front part of the outer wall of the limiting shaft 201 is provided with an annular outwardly extending first limiting boss 202, and the rear part of the inner wall of the limiting shaft 201 is provided with an annular inwardly extending first thrust boss 203. Two or more positioning chambers 204 are provided on the limiting shaft 201. The positioning chambers 204 are evenly distributed along the circumference. The positioning chambers 204 radially connect the outside and inside of the limiting shaft 201.

[0083] like Figure 1As shown, a positioning ball 3 is installed in the positioning chamber 204. The positioning ball 3 can move radially within the positioning chamber 204, and the radial inner side of the positioning ball 3 can be exposed into the limiting shaft 201. A reciprocating seat 4 is installed in the second section. The radial movement of the positioning ball 3 can drive the axial movement of the reciprocating seat 4. The reciprocating seat 4 drives the clamping transmission assembly 8 to move by pushing the first thrust seat 801.

[0084] like Figure 6 As shown, the locking seat 5 includes a hollow locking shaft 501, and the rear part of the outer wall of the locking shaft 501 is provided with an arc-shaped groove 503 corresponding to the positioning ball 3; as Figure 12 and 13 As shown, when the locking shaft 501 is inserted into the limiting shaft 201 until the positioning chamber 204 is radially aligned with the arc groove 503, the radial inner side of the positioning ball 3 can be exposed into the limiting shaft 201 and enter the arc groove 503, and the first thrust boss 203 and the second thrust seat 803 can contact and limit each other, thus achieving bidirectional self-locking.

[0085] In this embodiment, the elastomer 807 is generally preferably a spring.

[0086] As a preferred embodiment, the first limiting boss 202 is machined with a male thread, and the inner wall of the first segment 103 is machined with a female thread. The first segment 103 is fixedly connected to the first limiting boss 202 by the thread.

[0087] As a preferred embodiment of this invention, such as Figure 5 As shown, the reciprocating seat 4 includes a hollow reciprocating shaft 401 with open ends. The rear part of the inner wall of the reciprocating shaft 401 is provided with an annular, inwardly extending second thrust boss 402, which can apply thrust to the first thrust seat 801. The front end of the reciprocating shaft 401 is a guide platform 403, and an arc-shaped platform 404 is provided inside the reciprocating shaft 401. The arc-shaped platform 404 cooperates with the positioning ball 3 for contact and limitation.

[0088] As a preferred embodiment of this invention, such as Figure 6 As shown, the locking shaft 501 has open ends, and the front of the outer wall of the locking shaft 501 is provided with an outwardly extending connecting boss 502. The connecting boss 502 is installed in the sixth section 108. The connecting boss 502 is machined with a male thread, and the inner wall of the sixth section is machined with a female thread. The sixth section is fixedly connected to the connecting boss 502 by the thread.

[0089] As a preferred embodiment of this invention, such as Figure 7 As shown, a male plug 804 is installed inside the first thrust base 801, and a conical spring 805 is installed inside the male plug 804; a female socket 806 is installed inside the second thrust base 803; a wire 808 is installed inside the hollow inner tube 802, and the wire 808 electrically connects the male plug 804 and the female socket 806.

[0090] As a preferred embodiment of this invention, such as Figure 8 and Figure 9 As shown, the first thrust seat 801 includes a hollow first thrust seat body 80101. The front end of the inner wall of the first thrust seat body 80101 is provided with a thread for connecting to the male plug 804. The rear end of the inner wall of the first thrust seat body 80101 is provided with a thread for connecting to the hollow inner tube 802. The outer wall of the first thrust seat body 80101 is provided with a second limiting boss 80102. The second limiting boss 80102 is connected to a third thrust boss 80104 through two or more first support ribs 80103.

[0091] As a preferred embodiment of this invention, such as Figure 10 and Figure 11 As shown, the second thrust seat 803 includes a hollow second thrust seat body 80301; the front end of the inner wall of the second thrust seat body 80301 is provided with a thread for connecting to the hollow inner tube 802, the rear end of the inner wall of the second thrust seat body 80301 is provided with a thread for connecting to the female socket 806, and the outer wall of the second thrust seat body 80301 is provided with a third limiting boss 80302, and the third limiting boss 80302 is connected to a fourth thrust boss 80304 through two or more second support ribs 80303.

[0092] Example 2:

[0093] This embodiment describes the method of using the bidirectional self-locking wired transmission drill rod for directional drilling in coal mines, as given in Embodiment 1. Figure 12 and Figure 13 As shown, it includes the following steps:

[0094] Step 1, Initial State:

[0095] Before the drill pipe is used, the first thrust seat 801 and the reciprocating seat 4 of the tightening transmission assembly 8 are located at the foremost position under the elastic force of the elastic body 807, and the positioning ball 3 is exposed from the bottom of the positioning chamber 204 of the limiting ball seat 2 under the restriction of the reciprocating seat 4.

[0096] Step 2, Drill pipe installation:

[0097] The outer wall of the male connector 101 is machined with male threads, and the inner wall of the female connector 102 is machined with female threads. For adjacent front and rear drill rods to be connected, the drill rig's chuck clamps the front drill rod, and the drill rig's power head rotates the rear drill rod in the forward direction, connecting the female thread of the rear drill rod's female connector 102 with the male thread of the front drill rod's male connector 101. The locking shaft 501 of the locking seat 5 of the front drill rod pushes the positioning ball 3 of the rear drill rod to move radially outward and retract the positioning chamber 204. The positioning ball 3 of the rear drill rod pushes the reciprocating seat 4 and the first thrust seat 801 of the rear drill rod to move backward, compressing the elastic body 807, and the entire tightening transmission assembly 8 moves backward.

[0098] After the female thread of the female connector 102 of the rear drill rod is connected to the male thread of the male connector 101 of the front drill rod, the positioning chamber 204 of the limiting ball seat 2 of the rear drill rod is opposite to the arc groove 503 on the locking seat 5 of the front drill rod. The elastic body 807 of the rear drill rod pushes the first thrust seat 801 and the reciprocating seat 4 of the rear drill rod forward, causing the positioning ball 3 to move radially inward to expose the positioning chamber 204 and enter the arc groove 503. At the same time, the first thrust boss 203 of the limiting ball seat 2 of the rear drill rod contacts the fourth thrust boss 80304 of the second thrust seat 803 of the front drill rod. The locking transmission assembly 8 of the front drill rod is limited and cannot move axially. The locking transmission assembly 8 of the rear drill rod is not limited and can move axially.

[0099] As a preferred embodiment, in step two, after the female thread of the rear drill rod is connected to the male thread of the front drill rod, the male plug 804 of the rear drill rod enters the second thrust seat 803 of the front drill rod, the conical spring 805 of the rear drill rod contacts the female socket 806 of the front drill rod, and the locking transmission component 8 of the rear drill rod and the locking transmission component 8 of the front drill rod are electrically connected to form a wired signal transmission channel inside and outside the hole.

[0100] Step 3, Drill pipe locking:

[0101] After repeating step two to complete the installation of all drill rods, add a water supply fastener to the tail of the last drill rod. The inner core of the water supply fastener contacts the second thrust seat 803 of the last drill rod, and the locking transmission assembly 8 of the last drill rod is limited and cannot move axially. At this time, the locking transmission assemblies 8 from the first drill rod to the last drill rod are all limited and cannot move axially, and the connection between the first drill rod and the last drill rod is completely locked.

[0102] Step 4, directional drilling or accident handling:

[0103] The drill rod is rotated forward, backward, or alternately in both directions by the drilling rig to carry out directional drilling or handle accidents inside the hole.

[0104] As a preferred embodiment, step four includes three working conditions: forward rotary transmission, reverse rotary transmission, and alternating forward and reverse rotary transmission.

[0105] Forward rotary transmission operation:

[0106] When the drilling rig rotates the drill rod in the forward direction, the adjacent drill rods with positive thread connection continue to maintain a tight connection and transmit the forward rotation power to the bottom of the hole.

[0107] Reverse rotary transmission operation:

[0108] When the drill rod reverses, the connecting threads of adjacent drill rods are subjected to loosening torque, resulting in a tendency to separate. Under the pressure of the tightening transmission component 8, the reciprocating seat 4 keeps the positioning ball 3 within the locking seat 5. The locking seat 5 and the positioning ball 3 cannot generate relative movement. The adjacent drill rods lack loosening space and continue to maintain a tight connection, transmitting the reverse rotation power to the bottom of the hole.

[0109] Alternating forward and reverse rotation transmission operation:

[0110] When the drill rod is rotated alternately in both forward and reverse directions, adjacent drill rods remain tightly connected in the forward rotation and in the reverse rotation, and the power of the alternating forward and reverse rotation is transmitted to the bottom of the hole.

[0111] Step 5, unlock the drill pipe:

[0112] Remove the water supply device from the tail of the last drill rod. The locking transmission assembly 8 of the last drill rod is released from its limit and the axial movement function is restored. The locking transmission assemblies 8 of the remaining drill rods remain locked and limited.

[0113] Step 6, Drill pipe disassembly:

[0114] The front drill rod is clamped using the drill rig chuck, and the rear drill rod is rotated in the opposite direction using the drill rig power head. The female thread of the rear drill rod disengages from the male thread of the front drill rod. The locking shaft 501 of the front drill rod locking seat 5 pushes the positioning ball 3 of the rear drill rod to move outward and retract into the positioning chamber 204. The positioning ball 3 of the rear drill rod pushes its reciprocating seat 4 and the first thrust seat 801 to move backward, compressing the elastic body 807. The entire tightening transmission assembly 8 moves backward. At the same time, the first thrust boss 203 of the limiting ball seat 2 of the rear drill rod gradually disengages from the fourth thrust boss 80304 of the second thrust seat 803 of the front drill rod. The tightening transmission assembly 8 of the front drill rod is released from its limit and resumes its axial movement function. After the threads are untangled, the rear drill rod is removed from the drill rig.

Claims

1. A bidirectional self-locking wired transmission drill rod for directional drilling in coal mines, comprising a hollow drill rod body (1), a flow channel (9) provided inside the drill rod body (1), a male connector (101) provided at the front end of the drill rod body (1), and a female connector (102) provided at the rear end of the drill rod body (1), characterized in that: The drill pipe body (1) is divided into a first section (103), a second section (104), a third section (105), a fourth section (106), a fifth section (107), and a sixth section (108) that are connected sequentially from the front end to the rear end. The sixth section (108) is connected to the female connector (102). The inner diameters of the first section (103), the second section (104), the third section (105), and the fourth section (106) decrease sequentially, while the inner diameters of the fourth section (106), the fifth section (107), the sixth section (108), and the female connector (102) increase sequentially. The drill pipe body (1) is coaxially provided with a fixed transmission assembly (8) capable of axial reciprocating motion. The fixed transmission assembly (8) passes through the fourth section (106). The fixed transmission assembly (8) includes a first thrust seat (801), a hollow inner tube (802), and a second thrust seat (803) connected sequentially from front to back. A male plug (804) is installed in the first thrust seat (801), and a conical spring (805) is provided in the male plug (804). A female socket (806) is provided in the second thrust seat (803). A wire (808) is provided in the hollow inner tube (802), and the wire (808) electrically connects the male plug (804) and the female socket (806). The second thrust seat (803) includes a hollow second thrust seat body (80301); the front end of the inner wall of the second thrust seat body (80301) is provided with a thread for connecting to the hollow inner tube (802), the rear end of the inner wall of the second thrust seat body (80301) is provided with a thread for connecting to the female socket (806), the outer wall of the second thrust seat body (80301) is provided with a third limiting boss (80302), and the third limiting boss (80302) is connected to a fourth thrust boss (80304) through two or more second support ribs (80303); The third segment (105) is equipped with a first support ring (6), and the fifth segment (107) is equipped with a second support ring (7). The second support ring (7) is locked by a locking seat (5) installed in the sixth segment (108). The hollow inner tube (802) is supported by the first support ring (6) and the second support ring (7) and can reciprocate axially relative to the first support ring (6) and the second support ring (7). The first thrust seat (801) is located at the front end of the first support ring (6), and an elastic body (807) is provided between the first thrust seat (801) and the first support ring (6). The second thrust seat (803) is located at the rear end of the second support ring (7) and is located inside the locking seat (5). The first segment (103) is equipped with a limiting ball seat (2). The limiting ball seat (2) includes a hollow limiting shaft (201). Both ends of the limiting shaft (201) are open. The front part of the outer wall of the limiting shaft (201) is provided with an annular outwardly extending first limiting boss (202). The rear part of the inner wall of the limiting shaft (201) is provided with an annular inwardly extending first thrust boss (203). Two or more positioning chambers (204) are opened on the limiting shaft (201). The positioning chambers (204) are evenly distributed along the circumference. The positioning chambers (204) connect the outside and inside of the limiting shaft (201) radially. The positioning chamber (204) is equipped with a positioning ball (3), which can move radially within the positioning chamber (204), and the radial inner side of the positioning ball (3) can be exposed into the limiting shaft (201); the second section is equipped with a reciprocating seat (4), and the radial movement of the positioning ball (3) can drive the axial movement of the reciprocating seat (4), which in turn drives the clamping transmission assembly (8) to move by pushing the first thrust seat (801); The locking seat (5) includes a hollow locking shaft (501). The rear part of the outer wall of the locking shaft (501) is provided with an arc-shaped groove (503) corresponding to the positioning ball (3). When the locking shaft (501) is inserted into the limiting shaft (201) until the positioning chamber (204) and the arc-shaped groove (503) are radially aligned, the radial inner side of the positioning ball (3) can be exposed into the limiting shaft (201) and enter the arc-shaped groove (503). The first thrust boss (203) and the second thrust seat (803) can contact and limit the movement, thereby achieving bidirectional self-locking.

2. The bidirectional self-locking wired transmission drill rod for directional drilling in coal mines as described in claim 1, characterized in that, The first limiting boss (202) is machined with a male thread, and the inner wall of the first segment (103) is machined with a female thread. The first segment (103) is fixedly connected to the first limiting boss (202) by the thread.

3. The bidirectional self-locking wired transmission drill rod for directional drilling in coal mines as described in claim 1, characterized in that, The reciprocating seat (4) includes a hollow reciprocating shaft (401), with open ends. The rear part of the inner wall of the reciprocating shaft (401) is provided with an annular, inwardly extending second thrust boss (402), which can apply thrust to the first thrust seat (801). The front end of the reciprocating shaft (401) is a guide platform (403), and an arc-shaped platform (404) is provided inside the reciprocating shaft (401). The arc-shaped platform (404) and the positioning ball (3) cooperate to make contact and limit the movement.

4. The bidirectional self-locking wired transmission drill rod for directional drilling in coal mines as described in claim 1, characterized in that, The locking shaft (501) is open at both ends. The front part of the outer wall of the locking shaft (501) is provided with an outwardly extending connecting boss (502). The connecting boss (502) is installed in the sixth section (108). The connecting boss (502) is machined with a male thread, and the inner wall of the sixth section is machined with a female thread. The sixth section is fixedly connected to the connecting boss (502) by the thread.

5. The bidirectional self-locking wired transmission drill rod for directional drilling in coal mines as described in claim 1, characterized in that, The first thrust seat (801) includes a hollow first thrust seat body (80101). The front end of the inner wall of the first thrust seat body (80101) is provided with a thread for connecting to the male plug (804). The rear end of the inner wall of the first thrust seat body (80101) is provided with a thread for connecting to the hollow inner tube (802). The outer wall of the first thrust seat body (80101) is provided with a second limiting boss (80102). The second limiting boss (80102) is connected to a third thrust boss (80104) through two or more first support ribs (80103).

6. A method of using a bidirectional self-locking wired transmission drill rod for directional drilling in coal mines as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Step 1, Initial State: Before the drill pipe is used, the first thrust seat (801) and reciprocating seat (4) of the fixed transmission assembly (8) are located at the foremost position under the elastic force of the elastic body (807), and the positioning ball (3) is exposed from the bottom of the positioning chamber (204) of the limiting ball seat (2) under the restriction of the reciprocating seat (4); Step 2, Drill pipe installation: The outer wall of the male connector (101) is machined with male threads, and the inner wall of the female connector (102) is machined with female threads. For the adjacent front drill rod and rear drill rod to be connected, the cleaver clamps the front drill rod, the power head of the rig rotates the rear drill rod in the forward direction, and connects the female thread of the female connector (102) of the rear drill rod with the male thread of the male connector (101) of the front drill rod. The locking shaft (501) of the locking seat (5) of the front drill rod pushes the positioning ball (3) of the rear drill rod to move radially outward and retract the positioning chamber (204). The positioning ball (3) of the rear drill rod pushes the reciprocating seat (4) and the first thrust seat (801) of the rear drill rod to move backward, compressing the elastic body (807), and the tightening transmission assembly (8) moves backward as a whole. After the female thread of the female connector (102) of the rear drill rod is connected to the male thread of the male connector (101) of the front drill rod, the positioning chamber (204) of the limiting ball seat (2) of the rear drill rod is opposite to the arc groove (503) on the locking seat (5) of the front drill rod. The elastic body (807) of the rear drill rod pushes the first thrust seat (801) and the reciprocating seat (4) of the rear drill rod forward, so that the positioning ball (3) moves radially inward to expose the positioning chamber (204) and enter the arc groove (503). At the same time, the first thrust boss (203) of the limiting ball seat (2) of the rear drill rod contacts the fourth thrust boss (80304) of the second thrust seat (803) of the front drill rod. The locking transmission assembly (8) of the front drill rod is limited and cannot move axially. The locking transmission assembly (8) of the rear drill rod is not limited and can move axially. Step 3, Drill pipe locking: After repeating step two to complete the installation of all drill rods, a water fastener is added to the tail of the last drill rod. The inner core of the water fastener contacts the second thrust seat (803) of the last drill rod, and the locking transmission assembly (8) of the last drill rod is limited and cannot move axially. At this time, all locking transmission assemblies (8) from the first drill rod to the last drill rod are limited and cannot move axially, and all connections between the first drill rod and the last drill rod are locked. Step 4, directional drilling or accident handling: Using the drilling rig to rotate the drill rod in the forward, reverse, or alternating directions, directional drilling or in-hole accident handling can be carried out. Step 5, unlock the drill pipe: Remove the water supply device from the tail of the last drill rod, and the locking transmission assembly (8) of the last drill rod is released from its limit and the axial movement function is restored; the locking transmission assemblies (8) of the remaining drill rods remain limited and locked. Step 6, Drill pipe disassembly: The front drill rod is clamped by the drill rig clamp, and the rear drill rod is rotated in the opposite direction by the drill rig power head. The female thread of the rear drill rod is disengaged from the male thread of the front drill rod. The locking shaft (501) of the front drill rod locking seat (5) pushes the positioning ball (3) of the rear drill rod to move outward and retract into the positioning chamber (204). The positioning ball (3) of the rear drill rod pushes its reciprocating seat (4) and the first thrust seat (801) to move backward, compressing the elastic body (807). The tightening transmission assembly (8) moves backward as a whole. At the same time, the first thrust boss (203) of the limiting ball seat (2) of the rear drill rod and the fourth thrust boss (80304) of the second thrust seat (803) of the front drill rod gradually disengage. The tightening transmission assembly (8) of the front drill rod is released from the limit and restores the axial movement function. After the thread is untangled, the rear drill rod is removed from the drill rig.

7. The method of using the bidirectional self-locking wired transmission drill rod for directional drilling in coal mines as described in claim 6, characterized in that, In step two, after the female thread of the rear drill rod is connected to the male thread of the front drill rod, the male plug (804) of the rear drill rod enters the second thrust seat (803) of the front drill rod, the conical spring (805) of the rear drill rod contacts the female socket (806) of the front drill rod, and the locking transmission assembly (8) of the rear drill rod and the locking transmission assembly (8) of the front drill rod are electrically connected to form a wired transmission channel for signals inside and outside the hole.

8. The method of using the bidirectional self-locking wired transmission drill rod for directional drilling in coal mines as described in claim 6, characterized in that, Step four includes three operating conditions: forward rotary transmission, reverse rotary transmission, and alternating forward and reverse rotary transmission. The aforementioned forward rotary transmission condition: When the drilling rig rotates the drill rod in the forward direction, the adjacent drill rods with positive thread connection continue to maintain a tight connection and transmit the forward rotation power to the bottom of the hole; The aforementioned reverse rotary transmission condition: When the drill rod reverses, the connecting threads of adjacent drill rods are subjected to loosening torque, resulting in a tendency to separate. Under the pressure of the tightening transmission assembly (8), the reciprocating seat (4) keeps the positioning ball (3) within the locking seat (5). The locking seat (5) and the positioning ball (3) cannot generate relative movement. The adjacent drill rods lack loosening space and continue to maintain a tight connection, transmitting the reverse rotation power to the bottom of the hole. The aforementioned alternating forward and reverse rotation transmission condition: When the drill rod is rotated alternately in both forward and reverse directions, adjacent drill rods remain tightly connected in the forward rotation and in the reverse rotation, and the power of the alternating forward and reverse rotation is transmitted to the bottom of the hole.

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