Coupler for coal seam drilling signal transmission

Abstract

The invention relates to a coupler for coal seam drilling signal transmission, which comprises a coupler primary structure fixed on a drilling platform and a coupler secondary structure fixed on a drill rod of a drilling machine, the coupler primary structure sleeves the outer side of the coupler secondary structure, and a gap is formed between the coupler primary structure and the coupler secondary structure. The coupler primary structure and the coupler secondary structure are connected through a pair of bearings; the coupler primary structure is internally provided with a primary transmitting unit, the primary transmitting unit is electrically connected with a ground control system, the coupler secondary structure is internally provided with a secondary receiving unit at a corresponding position, the secondary receiving unit is electrically connected with a control system on a drill rod, and the primary transmitting unit and the secondary receiving unit are connected through electromagnetic coupling. According to the arrangement mode, on the basis that signal transmission is achieved, the problem that explosion occurs in the signal transmission process due to the fact that a coupler is installed on a downhole instrument in the prior art is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal seam drilling signal transmission, and in particular relates to a coupler for coal seam drilling signal transmission. Background Art

[0002] During the coal seam drilling process, there is a need for power supply and communication between the drilling rig and the ground control system. Wireless coupling energy signal transmission technology can realize the energy signal transmission function without contact. In the prior art, the coupler is installed on the logging instrument, the inner cylinder is the primary structure, and the outer cylinder is the secondary structure. The signal is transmitted to the inner cylinder through the bus by the change of mud displacement, and then transmitted to the outer cylinder through coupling. However, a large amount of explosive gas will be generated during the coal seam drilling process. If the coupler is installed on the downhole instrument, an explosion will occur during the signal transmission process. Summary of the invention

[0003] In order to solve all or part of the above problems, the purpose of the present invention is to provide a coupler for coal seam drilling signal transmission. The coupler for coal seam drilling signal transmission of the present invention overcomes the problem of explosion during signal transmission in the prior art due to the coupler being installed on the downhole instrument, thereby realizing stable signal transmission.

[0004] According to one aspect of the present invention, there is provided a coupler for coal seam drilling signal transmission, comprising a coupler primary structure fixed on a drilling platform and a coupler secondary structure fixed on a drill rod of a drilling rig, wherein the coupler primary structure is sleeved on the outside of the coupler secondary structure, and there is a gap between the coupler primary structure and the coupler secondary structure, and the coupler primary structure and the coupler secondary structure are connected via a pair of bearings;

[0005] A primary transmitting unit is arranged in the primary structure of the coupler, and the primary transmitting unit is electrically connected to the ground control system. A secondary receiving unit is arranged at a corresponding position in the secondary structure of the coupler, and the secondary receiving unit is electrically connected to the control system on the drill pipe. The primary transmitting unit and the secondary receiving unit are connected via electromagnetic coupling.

[0006] Further, the primary structure of the coupler includes a primary structure skeleton fixed on the drilling platform, the primary structure skeleton is connected with the outer rings of a pair of bearings by interference fit, a retaining ring is fixedly connected to the left end of the primary structure skeleton, the retaining ring is used to limit the outer ring of the bearing at the left end, a right outer limiting portion is provided on the right side of the primary structure skeleton, the right outer limiting portion is used to limit the outer ring of the bearing at the right end, and the two bearings are located between the retaining ring and the right outer limiting portion;

[0007] A primary pin is arranged at the left end of the primary structure skeleton, and the primary pin is used to be electrically connected to the ground control system. A transmitting unit mounting groove with an opening toward the coupler secondary structure is formed in the primary structure skeleton, and a primary circuit skeleton protection tube is arranged in the transmitting unit mounting groove. Both ends of the primary circuit skeleton protection tube are sealed and connected to the primary structure skeleton. The primary transmitting unit is arranged in a closed cavity formed by the primary structure skeleton and the primary circuit skeleton protection tube, and the primary transmitting unit passes through the primary structure skeleton to be electrically connected to the primary pin.

[0008] Further, the primary transmitting unit includes a primary coil, a primary magnetic core and a primary circuit, a primary circuit installation groove is provided on the primary structural skeleton, a primary protective tube is sleeved on the outer side of the primary structural skeleton, the primary protective tube is axially limited on the outer side of the primary structural skeleton, and the two ends of the primary protective tube are respectively sealed and connected to the two ends of the primary structural skeleton, the primary circuit installation groove is located in a closed cavity formed by the primary structural skeleton and the primary protective tube, and the primary circuit is fixed in the primary circuit installation groove;

[0009] The primary coil and the primary magnetic core are limitedly arranged in a closed cavity formed by the primary structural skeleton and the primary circuit skeleton protective tube. The primary structural skeleton is provided with a through hole for the wire to pass through. The two ends of the primary coil are electrically connected to the primary circuit by the wire passing through the through hole. The primary circuit is electrically connected to the primary pin. The primary circuit is used to process the electrical signal of the ground control system so that it is loaded on the primary coil in the form of alternating current.

[0010] Further, the primary structural skeleton includes a primary circuit skeleton, and two ends of the primary circuit skeleton are respectively fixedly connected with a baffle, the primary protection tube is sleeved on the outside of the primary circuit skeleton and is axially limited between the two baffles, the primary circuit installation groove is opened on the primary circuit skeleton, and the two ends of the primary circuit skeleton are sealed and connected with the two ends of the primary protection tube;

[0011] A primary bracket is provided between the two baffles for limiting position, and the two ends of the primary bracket are sealed to the two ends of the primary circuit skeleton, a right limiting ring is connected to the right side of the primary bracket, and the right limiting ring is located between the two baffles, and the transmitting unit installation groove is formed between the right limiting ring, the baffle at the left end, the primary bracket and the primary circuit skeleton protection tube, the left end of the primary bracket is sealed to the baffle at the left end, the left end of the primary circuit skeleton protection tube is sealed to the baffle at the left end, the right end of the primary circuit skeleton protection tube is sealed to the right limiting ring, a groove structure for wiring is provided on the primary bracket, and the through hole is provided on the primary circuit skeleton;

[0012] The primary pin is arranged at the left end of the primary circuit skeleton, and the baffle at the left end is provided with a matching hole that matches the primary pin. At least one baffle is fixed on the drilling platform, and each baffle is respectively connected with an outer ring of the bearing by interference fit. The right outer limiting portion is arranged on the baffle at the right end, and the baffle at the left end is fixedly connected to the retaining ring. The retaining ring is provided with a left outer limiting portion for limiting the outer ring of the bearing at the left end.

[0013] Furthermore, the primary coil is arranged in the primary coil sleeve, the primary magnetic core extends to the two ends of the primary coil sleeve, and an end face fixing block is arranged between the baffle at the left end and the left end of the primary coil sleeve and the left end of the primary magnetic core; an end face stopper is arranged between the right end of the primary coil sleeve, the right end of the primary magnetic core and the right limiting ring.

[0014] Further, the coupler secondary structure includes a secondary structure skeleton, the right end of the secondary structure skeleton is fixedly connected to the drill pipe, the two ends of the secondary structure skeleton are respectively connected to the inner rings of the two bearings by interference fit, a right inner limiting portion for limiting the inner ring of the bearing at the right end is provided on the right side of the secondary structure skeleton, a limiting sleeve is provided between the secondary structure skeleton and the bearing at the left end, the limiting sleeve is used to limit the inner ring of the bearing at the left end, and the two bearings are located outside the right inner limiting portion and the limiting sleeve;

[0015] A secondary pin is provided at the right end of the secondary structure skeleton, and the secondary pin is electrically connected to the control system on the drill rod. A receiving unit installation groove facing the primary transmitting unit is formed at a position on the secondary structure skeleton corresponding to the primary transmitting unit, and a magnetic core protection tube is provided in the receiving unit installation groove. Both ends of the magnetic core protection tube are respectively sealed and connected to the secondary structure skeleton. The secondary receiving unit is arranged in a closed cavity formed by the secondary structure skeleton and the magnetic core protection tube, and the secondary receiving unit passes through the secondary structure skeleton and is electrically connected to the secondary pin.

[0016] Further, the secondary structure skeleton includes a secondary circuit skeleton, the secondary pin is arranged at the right end of the secondary circuit skeleton, the right end of the secondary circuit skeleton is used to be fixedly connected to the drill rod, the outer side of the secondary circuit skeleton is sleeved with a circuit protection cylinder, the circuit protection cylinder is axially limited on the secondary circuit skeleton, the right inner limiting portion is arranged on the circuit protection cylinder, the limiting sleeve is sleeved on the secondary circuit skeleton, and the limiting sleeve is located between the circuit protection cylinder and the bearing at the left end, the circuit protection cylinder is formed with the receiving unit mounting groove, the two ends of the secondary circuit skeleton are sealed with the two ends of the circuit protection cylinder, the secondary circuit skeleton is provided with a secondary circuit mounting groove with an opening facing the circuit protection cylinder, the secondary circuit mounting groove is located in the sealing area formed by the secondary circuit skeleton and the circuit protection cylinder, and the secondary receiving unit includes a secondary circuit arranged in the secondary circuit mounting groove;

[0017] The two ends of the magnetic core protection tube are respectively sealed and connected to the circuit protection tube, and the secondary receiving unit also includes a secondary coil and a secondary magnetic core limitedly arranged in a closed cavity formed by the circuit protection tube and the magnetic core protection tube, and the two ends of the secondary coil pass through the circuit protection tube to be connected to the secondary circuit, and the secondary circuit is electrically connected to the secondary pin, and the secondary circuit is used to process the electrical signal generated by the secondary coil so that the electrical signal can be transmitted to the control system on the drill rod through the secondary pin.

[0018] Further, the circuit protection tube includes a secondary circuit skeleton protection tube and a secondary bracket, the secondary circuit skeleton protection tube is sleeved on the outside of the secondary circuit skeleton, the two ends of the secondary circuit skeleton protection tube are sealed and connected to the two ends of the secondary circuit skeleton, the secondary bracket is sleeved on the outside of the secondary circuit skeleton protection tube, the two ends of the secondary bracket are sealed and connected to the two ends of the secondary circuit skeleton protection tube, a first limiting step is provided on the right side of the secondary circuit skeleton protection tube, the secondary bracket is axially limited between the limiting sleeve and the first limiting step, a second limiting step is provided on the secondary circuit skeleton on the right side of the first limiting step, and the right inner limiting portion is provided on the secondary circuit skeleton protection tube between the first limiting step and the second limiting step;

[0019] A left limiting ring is provided at the left end of the secondary bracket, the magnetic core protection tube is sealedly connected to the left limiting ring, the magnetic core protection tube is sealedly connected to the first limiting step, the receiving unit installation groove is formed between the left limiting ring and the first limiting step, the left end of the magnetic core protection tube is sealedly connected to the left limiting ring, the right end of the magnetic core protection tube is sealedly connected to the first limiting step, a groove structure for wiring is provided on the secondary bracket, and a through hole for the wire between the secondary coil and the secondary circuit to pass through is provided on the secondary circuit skeleton protection tube.

[0020] Furthermore, the secondary coil is arranged in a secondary coil sleeve, and the secondary magnetic core extends to the two ends of the secondary coil sleeve, and a right stopper is arranged between the right end of the secondary coil sleeve, the right end of the secondary magnetic core and the first limiting step, and a left stopper is arranged between the left end of the secondary coil sleeve, the left end of the secondary magnetic core and the left limiting ring.

[0021] Furthermore, the gap between the coupler primary structure and the coupler secondary structure is 1 mm; a coolant flow channel is provided in the coupler secondary structure and runs from the left end to the right end, and the upper end of the coolant flow channel is used to connect with the faucet on the drilling platform through a faucet transition piece.

[0022] It can be seen from the above technical solution that the coupler for coal seam drilling signal transmission provided by the present invention has the following beneficial effects:

[0023] The arrangement of the present invention not only realizes signal transmission, but also overcomes the problem of explosion in the signal transmission process caused by the coupler being installed on the downhole instrument in the prior art, thereby realizing stable signal transmission; and the coupler of the present invention has the advantage of not being limited by the narrow installation space downhole;

[0024] The sealing connection of the present invention is a static seal achieved by the cooperation of an O-ring and a sealing groove, so the wear on the O-ring is extremely small, so that sealing failure is not likely to occur, and the working life of the system is relatively long. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A cross-sectional view of a coupler for coal seam drilling signal transmission according to an embodiment of the present invention;

[0026] Figure 2 is a cross-sectional view of a primary structure of a coupler according to an embodiment of the present invention;

[0027] Figure 3 is a cross-sectional view of a secondary structure of a coupler according to an embodiment of the present invention;

[0028] The figures in the figure are marked as: faucet transition piece 1, bearing 2, coupler secondary structure 3, secondary circuit skeleton 31, second limiting step 311, secondary circuit skeleton protection tube 32, first limiting step 321, right inner limiting part 322, secondary bracket 33, left limiting ring 331, secondary magnetic core 34, secondary coil sleeve 35, right stopper 36, magnetic core protection tube 37, left stopper 38, coupler primary structure 4, primary circuit skeleton 41, primary circuit mounting groove 411, primary protection tube 42, end face fixing block 43, primary bracket 44, right limiting ring 441, primary circuit skeleton protection tube 45, primary magnetic core 46, primary coil sleeve 47, end face stopper 48, limiting sleeve 5, baffle 6, right outer limiting part 61, retaining ring 7, coolant flow channel 8. DETAILED DESCRIPTION

[0029] In order to better understand the purpose, structure and function of the present invention, the coupler for coal seam drilling signal transmission of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0030] like Figure 1 , Figure 2 , Figure 3 As shown, it shows a coupler for coal seam drilling signal transmission according to an embodiment of the present invention, including a coupler primary structure 4 fixed on the drilling platform and a coupler secondary structure 3 fixed on the drill pipe of the drilling rig, the coupler primary structure 4 is sleeved on the outside of the coupler secondary structure 3, and there is a gap between the coupler primary structure 4 and the coupler secondary structure 3, and the coupler primary structure 4 and the coupler secondary structure 3 are connected by a pair of bearings 2; a primary transmitting unit is arranged in the coupler primary structure 4, and the primary transmitting unit is electrically connected to the ground control system, a secondary receiving unit is arranged at a corresponding position in the coupler secondary structure 3, and the secondary receiving unit is electrically connected to the control system on the drill pipe, and the primary transmitting unit and the secondary receiving unit are connected by electromagnetic coupling.

[0031] The coupler of the embodiment of the present invention includes a coupler primary structure 4 and a coupler secondary structure 3, wherein the coupler primary structure 4 is fixed on the drilling platform, so the coupler primary structure 4 remains relatively stationary with the drilling platform; the coupler secondary structure 3 is fixed on the drill pipe of the drilling rig, and the coupler secondary structure 3 rotates with the drill pipe; the coupler primary structure 4 and the coupler secondary structure 3 are connected through a bearing 2, the coupler secondary structure 3 is located in the inner ring of the bearing 2, the coupler primary structure 4 is located outside the outer ring of the bearing 2, and the coupler primary structure 4 is sleeved on the outside of the coupler secondary structure 3, and there is a gap between the coupler secondary structure 3 and the coupler primary structure 4, and the existence of the gap is used to avoid the situation where the coupler primary structure 4 is rubbed due to the rotation of the coupler secondary structure 3.

[0032] Among them, a primary transmitting unit is arranged in the primary structure 4 of the coupler, and the primary transmitting unit is electrically connected to the ground control system to receive communication signals and electrical signals of the ground control system; a secondary receiving unit is arranged at a corresponding position in the secondary structure 3 of the coupler, and the primary transmitting unit and the secondary receiving unit are connected by electromagnetic coupling, so the communication signals and electrical signals received by the primary transmitting unit are transmitted to the secondary receiving unit through the principle of electromagnetic induction; the secondary receiving unit is electrically connected to the control system on the drill rod, so that the secondary receiving unit transmits the received electrical signals and communication signals to the control system on the drill rod.

[0033] The arrangement of the embodiment of the present invention overcomes the problem of explosion during signal transmission in the prior art caused by the coupler being installed on the downhole instrument on the basis of realizing signal transmission, thereby realizing stable signal transmission; and the coupler of the present invention has the advantage of not being limited by the narrow installation space underground.

[0034] In one embodiment, for example, the gap between the coupler primary structure 4 and the coupler secondary structure 3 is 1 mm.

[0035] In one embodiment, a coolant flow channel 8 is provided in the coupler secondary structure 3 and runs from the left end to the right end. The upper end of the coolant flow channel 8 is used to connect to the faucet on the drilling platform through the faucet transition piece 1.

[0036] The setting of the coolant flow channel 8 here realizes the weight reduction of the coupler on the one hand, and on the other hand, the upper end of the coolant flow channel 8 is used to pass through the faucet transition piece 1 and the faucet on the drilling platform, so that the coolant in the faucet can enter the coolant flow channel 8 through the faucet transition piece 1. The coolant flows downward to the drill pipe, which can cool the drill pipe.

[0037] In one embodiment, the coupler primary structure 4 includes a primary structure skeleton fixed on the drilling platform, the primary structure skeleton is interference fit connected to the outer rings of a pair of bearings 2, a retaining ring 7 is fixedly connected to the left end of the primary structure skeleton, the retaining ring 7 is used to limit the outer ring of the bearing 2 at the left end, and a right outer limiting portion 61 is provided on the right side of the primary structure skeleton, the right outer limiting portion 61 is used to limit the outer ring of the bearing 2 at the right end, and the two bearings 2 are located between the retaining ring 7 and the right outer limiting portion 61.

[0038] In this embodiment, the outer ring of the left end bearing 2 is limited by the retaining ring 7 fixedly connected to the left end of the primary structure frame, and the outer ring of the right end bearing 2 is limited by the right outer limiting portion 61 set on the right side of the primary structure frame. After installation, the two bearings 2 are located between the retaining ring 7 and the right outer limiting portion 61, and the outer rings of the two bearings 2 are connected to the primary structure frame by interference fit. The arrangement of this embodiment realizes the limitation and installation between the primary structure frame and a pair of bearings 2.

[0039] Among them, a primary pin is arranged at the left end of the primary structure skeleton, and the primary pin is used to be electrically connected to the ground control system. A transmitting unit mounting groove with an opening toward the coupler secondary structure 3 is formed in the primary structure skeleton, and a primary circuit skeleton protection tube 45 is arranged in the transmitting unit mounting groove. Both ends of the primary circuit skeleton protection tube 45 are sealed and connected to the primary structure skeleton. The primary transmitting unit is arranged in a closed cavity formed by the primary structure skeleton and the primary circuit skeleton protection tube 45, and the primary transmitting unit passes through the primary structure skeleton to be electrically connected to the primary pin.

[0040] In this embodiment, the coupler primary structure 4 is electrically connected to the ground control system through the primary pin at the left end of the primary structure frame, so the electrical signal and communication signal of the ground control system are first transmitted to the primary pin.

[0041] Again, a transmitting unit mounting groove is formed in the primary structure skeleton with its opening facing the coupler secondary structure 3, a primary circuit skeleton protection tube 45 is arranged in the mounting groove, and both ends of the primary circuit skeleton protection tube 45 are sealed and connected to the primary structure skeleton, so that the transmitting unit mounting groove between the primary circuit skeleton protection tube 45 and the primary structure skeleton forms a closed cavity, and the primary transmitting unit is arranged in the closed cavity.

[0042] Finally, the primary transmitting unit disposed in the closed cavity is electrically connected to the primary pins through the primary structural frame, so that the electrical signals and communication signals received by the primary pins are correspondingly transmitted to the primary transmitting unit.

[0043] In one embodiment, the primary transmitting unit includes a primary coil, a primary magnetic core 46 and a primary circuit. A primary circuit mounting groove 411 is provided on the primary structural frame. A primary protective tube 42 is sleeved on the outer side of the primary structural frame. The primary protective tube 42 is axially limited on the outer side of the primary structural frame, and the two ends of the primary protective tube 42 are respectively sealed and connected to the two ends of the primary structural frame. The primary circuit mounting groove 411 is located in a closed cavity formed by the primary structural frame and the primary protective tube 42, and the primary circuit is fixed in the primary circuit mounting groove 411.

[0044] In this embodiment, the opening of the primary circuit mounting groove 411 is arranged to face away from the coupler secondary structure 3, and the primary circuit of the primary transmitting unit is arranged in the primary circuit mounting groove 411. In order to protect the primary circuit, a primary protective tube 42 is sleeved on the outer side of the primary structure skeleton, and the two ends of the primary protective tube 42 are respectively sealed and connected to the two ends of the primary structure skeleton, so that the primary circuit is in a closed cavity formed by the primary structure skeleton and the primary protective tube 42.

[0045] Among them, the primary coil and primary magnetic core 46 of the primary transmitting unit are limitedly set in a closed cavity formed by the primary structural frame and the primary circuit frame protection tube 45. The primary structural frame is provided with a through hole for the wire to pass through. The two ends of the primary coil are electrically connected to the primary circuit through the through hole through which the wire passes. The primary circuit is electrically connected to the primary pin. The primary circuit is used to process the electrical signal of the ground control system so that it is loaded on the primary coil in the form of alternating current.

[0046] In this embodiment, the primary coil and the primary magnetic core 46 are both arranged in a closed cavity formed by the primary structural frame and the primary circuit frame protective tube 45. The two ends of the primary coil are electrically connected to the primary circuit through the perforations on the primary structural frame. The primary circuit is used to analyze and process the received electrical signals and communication signals of the ground control system, so that the electrical signals and communication signals transmitted by the ground control system are loaded on the primary coil in the form of alternating current.

[0047] In one embodiment, the primary structural frame includes a primary circuit frame 41, and two ends of the primary circuit frame 41 are respectively fixedly connected with a baffle 6, the primary protection tube 42 is sleeved on the outside of the primary circuit frame 41, and is axially limited between the two baffles 6, the primary circuit installation groove 411 is opened on the primary circuit frame 41, and the two ends of the primary circuit frame 41 are sealed and connected with the two ends of the primary protection tube 42;

[0048] In this embodiment, the primary structural skeleton includes a primary circuit skeleton 41, the aforementioned primary circuit installation groove 411 is opened on the primary circuit skeleton 41, and the two ends of the primary circuit skeleton 41 are sealed and connected to the two ends of the primary protection tube 42, so that the primary circuit installation groove 411 between the primary circuit skeleton 41 and the primary protection tube 42 forms a closed cavity for installing the primary circuit. Among them, the left and right ends of the primary circuit skeleton 41 are respectively fixedly connected to a baffle 6, the primary protection tube 42 is sleeved on the primary circuit skeleton 41, and the primary protection tube 42 is axially limited between the two baffles 6, and the maximum outer diameter of the baffle 6 at this location needs to be greater than the maximum outer diameter of the primary protection tube 42.

[0049] Secondly, the primary pin is arranged at the left end of the primary circuit skeleton 41, and a matching hole matching with the primary pin is arranged on the baffle 6 at the left end, so as to facilitate the ground control system to connect with the primary pin at the left end of the primary circuit skeleton 41 by passing the wire through the matching hole.

[0050] Again, a primary bracket 44 is provided between the two baffles 6 for limiting, and the two ends of the primary bracket 44 are sealed to the two ends of the primary circuit skeleton 41, and a right limiting ring 441 is connected to the right side of the primary bracket 44, and the right limiting ring 441 is located between the two baffles 6. A launch unit installation groove is formed between the right limiting ring 441, the baffle 6 at the left end, the primary bracket 44, and the primary circuit skeleton protection tube 45, and the primary magnetic core 46 and the primary coil of the launch unit are located in the launch unit installation groove. In order to isolate the launch coil and the liquid medium, the following sealing relationship needs to be satisfied: the left end of the primary bracket 44 is sealed to the baffle 6 at the left end, the left end of the primary circuit skeleton protection tube 45 is sealed to the baffle 6 at the left end, and the right end of the primary circuit skeleton protection tube 45 is sealed to the right limiting ring 441.

[0051] The primary bracket 44 is provided with a slot structure for wiring, and a perforation is provided on the primary circuit skeleton 41 , where both ends of the primary coil pass through the slot structure on the primary bracket 44 and the perforation on the aforementioned primary circuit skeleton 41 and are connected to the primary pins at the left end of the primary circuit skeleton 41 .

[0052] Again, at least one baffle plate 6 is fixed on the drilling platform, and each baffle plate 6 is respectively connected with the outer ring of a bearing 2 by interference fit. The right outer limit portion 61 is arranged on the baffle plate 6 at the right end, and the baffle plate 6 at the left end is fixedly connected to the retaining ring 7. The retaining ring 7 is provided with a left outer limit portion for limiting the outer ring of the bearing 2 at the left end.

[0053] In this embodiment, the outer ring of each bearing 2 is interference fit with a baffle 6, the right outer limit portion 61 is set on the baffle 6 at the right end, and the left outer limit portion is set on the baffle ring 7. The two bearings 2 are limited between the right outer limit portion 61 and the left outer limit portion.

[0054] Finally, the aforementioned sealing connections are all static seals achieved through the cooperation of O-rings and sealing grooves, so the wear on the O-rings is extremely small, so that sealing failure is not likely to occur, and the working life of the system is relatively long.

[0055] In one embodiment, the primary coil is arranged in the primary coil sleeve 47, and the primary magnetic core 46 extends to both ends of the primary coil sleeve 47, and an end face fixing block 43 is arranged between the left end baffle 6 and the left end of the primary coil sleeve 47 and the left end of the primary magnetic core 46; an end face stopper 48 is arranged between the right end of the primary coil sleeve 47, the right end of the primary magnetic core 46 and the right limiting ring 441.

[0056] In this embodiment, the primary coil sleeve 47 and the primary magnetic core 46 are located in the closed cavity formed by the right limiting ring 441, the left end baffle 6, the primary bracket 44 and the primary circuit skeleton protection tube 45, and both are limited by the end face fixing block 43 and the end face stop block 48.

[0057] The coupler primary structure 4 of this embodiment is described again as follows: from outside to inside, it comprises: a primary protection tube 42 , a primary circuit skeleton 41 , a primary bracket 44 , a primary magnetic core 46 , a primary coil sleeve 47 and a primary circuit skeleton protection tube 45 .

[0058] In one embodiment, the coupler secondary structure 3 includes a secondary structure skeleton, the right end of the secondary structure skeleton is fixedly connected to the drill pipe, the two ends of the secondary structure skeleton are respectively connected to the inner rings of the two bearings 2 by interference fit, and a right inner limiting portion 322 for limiting the inner ring of the bearing 2 at the right end is provided on the right side of the secondary structure skeleton, and a limiting sleeve 5 is provided between the secondary structure skeleton and the bearing 2 at the left end, and the limiting sleeve 5 is used to limit the inner ring of the bearing 2 at the left end, and the two bearings 2 are located outside the right inner limiting portion 322 and the limiting sleeve 5.

[0059] In this embodiment, the coupler secondary structure 3 includes a secondary structure skeleton, a right inner limiting portion 322 for limiting the inner ring of the right end bearing 2 is arranged on the right side of the secondary structure skeleton, and a limiting sleeve 5 for limiting the inner ring of the left end bearing 2 is arranged between the secondary structure skeleton and the left end bearing 2, and the limiting sleeve 5 is sleeved on the secondary structure skeleton. After installation, the two bearings 2 are located outside the right inner limiting portion 322 and the limiting sleeve 5, and the inner rings of the two bearings 2 are connected to the secondary structure skeleton by interference fit. The arrangement of this embodiment realizes the limiting and installation between the secondary structure skeleton and a pair of bearings 2.

[0060] Among them, a secondary pin is arranged at the right end of the secondary structure skeleton, and the secondary pin is electrically connected to the control system on the drill rod. A receiving unit installation groove facing the primary transmitting unit is formed at a position on the secondary structure skeleton corresponding to the primary transmitting unit, and a magnetic core protection tube 37 is arranged in the receiving unit installation groove. Both ends of the magnetic core protection tube 37 are respectively sealed and connected to the secondary structure skeleton. The secondary receiving unit is arranged in a closed cavity formed by the secondary structure skeleton and the magnetic core protection tube 37, and the secondary receiving unit passes through the secondary structure skeleton to be electrically connected to the secondary pin.

[0061] In this embodiment, the coupler secondary structure 3 is electrically connected to the control system on the drill rod through the secondary pin at the right end of the secondary structure skeleton. Therefore, after the coupler secondary structure 3 receives the electrical signal and communication signal from the coupler primary structure 4, it transmits it to the control system on the drill rod through the secondary pin.

[0062] Again, a receiving unit installation groove is formed in the secondary structure skeleton, and the opening faces the primary structure 4 of the coupler. The magnetic core protection tube 37 is arranged in the installation groove, and both ends of the magnetic core protection tube 37 are sealed and connected to the secondary structure skeleton, so that the receiving unit installation groove between the magnetic core protection tube 37 and the secondary structure skeleton forms a closed cavity, and the secondary receiving unit is arranged in the closed cavity.

[0063] Finally, the secondary receiving unit disposed in the closed cavity is electrically connected to the secondary pins through the secondary structural frame, so that the electrical signals and communication signals received by the secondary receiving unit are correspondingly transmitted to the secondary pins.

[0064] In one embodiment, the secondary structure skeleton includes a secondary circuit skeleton 31, the secondary pin is arranged at the right end of the secondary circuit skeleton 31, the right end of the secondary circuit skeleton 31 is used to be fixedly connected to the drill rod, the outer side of the secondary circuit skeleton 31 is sleeved with a circuit protection tube, the circuit protection tube is axially limited on the secondary circuit skeleton 31, the right inner limiting portion 322 is arranged on the circuit protection tube, the limiting sleeve 5 is sleeved on the secondary circuit skeleton 31, and the limiting sleeve 5 is located between the circuit protection tube and the bearing 2 at the left end.

[0065] Among them, a receiving unit installation groove is formed on the circuit protection tube, and the two ends of the secondary circuit skeleton 31 are sealed and connected to the two ends of the circuit protection tube. A secondary circuit installation groove with an opening toward the circuit protection tube is opened on the secondary circuit skeleton 31. The secondary circuit installation groove is located in the sealing area formed by the secondary circuit skeleton 31 and the circuit protection tube. The secondary receiving unit includes a secondary circuit arranged in the secondary circuit installation groove.

[0066] In this embodiment, the opening of the secondary circuit installation groove faces the circuit protection tube, and the secondary circuit installation groove is located in the sealed area formed after the secondary circuit skeleton 31 is sealed and connected with the circuit protection tube. The secondary circuit of the secondary receiving unit is arranged in the secondary circuit installation groove in the sealed area. The arrangement of this embodiment realizes the protection of the secondary circuit.

[0067] Both ends of the magnetic core protection tube 37 are sealed and connected to the circuit protection tube respectively. The secondary receiving unit also includes a secondary coil and a secondary magnetic core 34 which are limitedly set in a closed cavity formed by the circuit protection tube and the magnetic core protection tube 37. Both ends of the secondary coil pass through the circuit protection tube to be connected to the secondary circuit. The secondary circuit is electrically connected to the secondary pin. The secondary circuit is used to process the electrical signal generated by the secondary coil so that the electrical signal can be transmitted to the control system on the drill pipe through the secondary pin.

[0068] In this embodiment, the secondary coil and the secondary magnetic core 34 of the secondary receiving unit are arranged in a closed cavity formed by the circuit protection tube and the magnetic core protection tube 37. The secondary coil is used to receive the electromagnetic signal emitted by the primary coil. The two ends of the secondary coil are connected to the secondary circuit through the perforations on the circuit protection tube. The secondary circuit is used to process the electrical signal generated by the secondary coil, such as analyzing the signal and converting the AC signal into a DC signal, so that the control system on the drill pipe can receive the corresponding signal.

[0069] Again, the coolant flow channel 8 within the aforementioned coupler secondary structure 3 is arranged in the secondary circuit skeleton 31, and the left end of the secondary circuit skeleton 31 is threadedly connected to the faucet transition piece 1. For example, the right end of the faucet transition piece 1 is provided with an external thread structure, and the left end of the secondary circuit skeleton 31 is provided with an internal thread hole. The external thread structure and the internal thread hole are threadedly connected, thereby realizing the threaded connection between the secondary circuit skeleton 31 and the faucet transition piece 1.

[0070] Finally, for the fixed connection between the secondary circuit skeleton 31 and the drill rod, for example, an external thread structure is provided at the right end of the secondary circuit skeleton 31, and the secondary circuit skeleton 31 is threadedly connected to the internal thread hole on the drill rod through the external thread structure.

[0071] In one embodiment, the circuit protection tube includes a secondary circuit skeleton protection tube 32 and a secondary bracket 33. The secondary circuit skeleton protection tube 32 is sleeved on the outside of the secondary circuit skeleton 31, and the two ends of the secondary circuit skeleton protection tube 32 are sealed and connected to the two ends of the secondary circuit skeleton 31. The secondary bracket 33 is sleeved on the outside of the secondary circuit skeleton protection tube 32, and the two ends of the secondary bracket 33 are sealed and connected to the two ends of the secondary circuit skeleton protection tube 32. A first limiting step 321 is provided on the right side of the secondary circuit skeleton protection tube 32, and the secondary bracket 33 is axially limited between the limiting sleeve 5 and the first limiting step 321. A second limiting step 311 is provided on the secondary circuit skeleton 31 on the right side of the first limiting step 321, and a right inner limiting portion 322 is provided on the secondary circuit skeleton protection tube 32 between the first limiting step 321 and the second limiting step 311.

[0072] In this embodiment, a second limiting step 311 is provided on the secondary circuit skeleton 31, and the second limiting step 311 is used to limit the right end of the secondary circuit skeleton protection tube 32. The right inner limiting portion 322 is provided on the secondary circuit skeleton protection tube 32 between the first limiting step 321 and the second limiting step 311, and the right inner limiting portion 322 is located on the left side of the bearing 2 at the right end. The first limiting step 321 is provided at the left end of the right inner limiting portion 322, and the first limiting step 321 is used to limit the secondary bracket 33 sleeved on the outer side of the secondary circuit skeleton 31. The two ends of the secondary circuit skeleton protection tube 32 are sealed and connected with the two ends of the secondary circuit skeleton 31 to form a closed cavity between the two, and the secondary circuit installation groove on the secondary circuit skeleton 31 is located in the closed cavity.

[0073] Among them, a left limiting ring 331 is provided at the left end of the secondary bracket 33, the magnetic core protection tube 37 is sealedly connected to the left limiting ring 331, the magnetic core protection tube 37 is sealedly connected to the first limiting step 321, a receiving unit installation groove is formed between the left limiting ring 331 and the first limiting step 321, the left end of the magnetic core protection tube 37 is sealedly connected to the left limiting ring 331, and the right end of the magnetic core protection tube 37 is sealedly connected to the first limiting step 321.

[0074] The secondary bracket 33 is provided with a slot structure for wiring, and the secondary circuit skeleton protection tube 32 is provided with a through hole for the wire between the secondary coil and the secondary circuit to pass through. The two ends of the secondary coil pass through the slot structure on the secondary bracket 33 and the through hole on the secondary circuit skeleton protection tube 32 to connect with the secondary pin at the right end of the secondary circuit skeleton 31.

[0075] In one embodiment, the secondary coil is arranged in the secondary coil sleeve 35, and the secondary magnetic core 34 extends to both ends of the secondary coil sleeve 35. A right stopper 36 is arranged between the right end of the secondary coil sleeve 35, the right end of the secondary magnetic core 34 and the first limiting step 321, and a left stopper 38 is arranged between the left end of the secondary coil sleeve 35, the left end of the secondary magnetic core 34 and the left limiting ring 331.

[0076] In this embodiment, the secondary coil sleeve 35 and the secondary magnetic core 34 are located in the closed cavity formed by the magnetic core protection tube 37, the secondary bracket 33, the secondary circuit skeleton 31 and the secondary circuit skeleton protection tube 32, and both are limited by the left stopper 38 and the right stopper 36.

[0077] The secondary structure 3 of the coupler of this embodiment is described again as follows: from outside to inside, it includes: a magnetic core protection tube 37, a secondary coil sleeve 35, a secondary magnetic core 34, a secondary bracket 33, a secondary circuit skeleton protection tube 32 and a secondary circuit skeleton 31.

[0078] Thirdly, the sealing connections at various locations of the coupler secondary structure 3 are static seals achieved through the cooperation of O-rings and sealing grooves, so the wear on the O-rings is extremely small, and sealing failure is not likely to occur, and the service life of the system is relatively long.

[0079] Finally, the gap between the aforementioned coupler primary structure 4 and the coupler secondary structure 3 is the gap between the magnetic core protection tube 37 and the primary circuit skeleton protection tube 45 .

[0080] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0081] In addition, the terms "one", "two", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0082] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A coupler for coal seam drilling signal transmission, characterized in that: The invention comprises a coupler primary structure fixed on the drilling platform and a coupler secondary structure fixed on the drill pipe of the drilling rig, wherein the coupler primary structure is sleeved on the outside of the coupler secondary structure, and there is a gap between the coupler primary structure and the coupler secondary structure, and the coupler primary structure and the coupler secondary structure are connected by a pair of bearings; A primary transmitting unit is arranged in the primary structure of the coupler, and the primary transmitting unit is electrically connected to the ground control system. A secondary receiving unit is arranged at a corresponding position in the secondary structure of the coupler, and the secondary receiving unit is electrically connected to the control system on the drill pipe. The primary transmitting unit and the secondary receiving unit are connected via electromagnetic coupling.

2. The coupler for coal seam drilling signal transmission according to claim 1, characterized in that: The primary structure of the coupler comprises a primary structure skeleton fixed on the drilling platform, the primary structure skeleton is connected with the outer rings of a pair of bearings by interference fit, a retaining ring is fixedly connected to the left end of the primary structure skeleton, the retaining ring is used to limit the outer ring of the bearing at the left end, a right outer limiting part is arranged on the right side of the primary structure skeleton, the right outer limiting part is used to limit the outer ring of the bearing at the right end, and the two bearings are located between the retaining ring and the right outer limiting part; A primary pin is arranged at the left end of the primary structure skeleton, and the primary pin is used to be electrically connected to the ground control system. A transmitting unit mounting groove with an opening toward the coupler secondary structure is formed in the primary structure skeleton, and a primary circuit skeleton protection tube is arranged in the transmitting unit mounting groove. Both ends of the primary circuit skeleton protection tube are sealed and connected to the primary structure skeleton. The primary transmitting unit is arranged in a closed cavity formed by the primary structure skeleton and the primary circuit skeleton protection tube, and the primary transmitting unit passes through the primary structure skeleton to be electrically connected to the primary pin.

3. The coupler for coal seam drilling signal transmission according to claim 2, characterized in that: The primary transmitting unit comprises a primary coil, a primary magnetic core and a primary circuit, a primary circuit mounting groove is provided on the primary structural frame, a primary protective tube is sleeved on the outer side of the primary structural frame, the primary protective tube is axially limited on the outer side of the primary structural frame, and two ends of the primary protective tube are respectively sealed and connected with two ends of the primary structural frame, the primary circuit mounting groove is located in a closed cavity formed by the primary structural frame and the primary protective tube, and the primary circuit is fixed in the primary circuit mounting groove; The primary coil and the primary magnetic core are limitedly arranged in a closed cavity formed by the primary structural skeleton and the primary circuit skeleton protective tube. The primary structural skeleton is provided with a through hole for the wire to pass through. The two ends of the primary coil are electrically connected to the primary circuit by the wire passing through the through hole. The primary circuit is electrically connected to the primary pin. The primary circuit is used to process the electrical signal of the ground control system so that it is loaded on the primary coil in the form of alternating current.

4. The coupler for coal seam drilling signal transmission according to claim 3, characterized in that: The primary structural frame includes a primary circuit frame, and two ends of the primary circuit frame are respectively fixedly connected with a baffle, the primary protection tube is sleeved on the outside of the primary circuit frame and is axially limited between the two baffles, the primary circuit installation groove is provided on the primary circuit frame, and the two ends of the primary circuit frame are sealed and connected with the two ends of the primary protection tube; A primary bracket is provided between the two baffles for limiting position, and the two ends of the primary bracket are sealed to the two ends of the primary circuit skeleton, a right limiting ring is connected to the right side of the primary bracket, and the right limiting ring is located between the two baffles, and the transmitting unit installation groove is formed between the right limiting ring, the baffle at the left end, the primary bracket and the primary circuit skeleton protection tube, the left end of the primary bracket is sealed to the baffle at the left end, the left end of the primary circuit skeleton protection tube is sealed to the baffle at the left end, the right end of the primary circuit skeleton protection tube is sealed to the right limiting ring, a groove structure for wiring is provided on the primary bracket, and the through hole is provided on the primary circuit skeleton; The primary pin is arranged at the left end of the primary circuit skeleton, and the baffle at the left end is provided with a matching hole that matches the primary pin. At least one baffle is fixed on the drilling platform, and each baffle is respectively connected with an outer ring of the bearing by interference fit. The right outer limiting portion is arranged on the baffle at the right end, and the baffle at the left end is fixedly connected to the retaining ring. The retaining ring is provided with a left outer limiting portion for limiting the outer ring of the bearing at the left end.

5. The coupler for coal seam drilling signal transmission according to claim 4, characterized in that: The primary coil is arranged in the primary coil sleeve, and the primary magnetic core extends to the two ends of the primary coil sleeve. An end face fixing block is arranged between the baffle at the left end and the left end of the primary coil sleeve and the left end of the primary magnetic core; an end face stopper is arranged between the right end of the primary coil sleeve, the right end of the primary magnetic core and the right limiting ring.

6. The coupler for coal seam drilling signal transmission according to claim 1, characterized in that: The coupler secondary structure comprises a secondary structure skeleton, the right end of the secondary structure skeleton is fixedly connected to the drill pipe, the two ends of the secondary structure skeleton are respectively connected to the inner rings of the two bearings by interference fit, a right inner limiting portion for limiting the inner ring of the bearing at the right end is arranged on the right side of the secondary structure skeleton, a limiting sleeve is arranged between the secondary structure skeleton and the bearing at the left end, the limiting sleeve is used to limit the inner ring of the bearing at the left end, and the two bearings are located outside the right inner limiting portion and the limiting sleeve; A secondary pin is provided at the right end of the secondary structure skeleton, and the secondary pin is electrically connected to the control system on the drill rod. A receiving unit installation groove facing the primary transmitting unit is formed at a position on the secondary structure skeleton corresponding to the primary transmitting unit, and a magnetic core protection tube is provided in the receiving unit installation groove. Both ends of the magnetic core protection tube are respectively sealed and connected to the secondary structure skeleton. The secondary receiving unit is arranged in a closed cavity formed by the secondary structure skeleton and the magnetic core protection tube, and the secondary receiving unit passes through the secondary structure skeleton and is electrically connected to the secondary pin.

7. The coupler for coal seam drilling signal transmission according to claim 6, characterized in that: The secondary structure skeleton includes a secondary circuit skeleton, the secondary pin is arranged at the right end of the secondary circuit skeleton, the right end of the secondary circuit skeleton is used to be fixedly connected to the drill rod, the outer side of the secondary circuit skeleton is sleeved with a circuit protection cylinder, the circuit protection cylinder is axially limited on the secondary circuit skeleton, the right inner limiting portion is arranged on the circuit protection cylinder, the limiting sleeve is sleeved on the secondary circuit skeleton, and the limiting sleeve is located between the circuit protection cylinder and the bearing at the left end, the circuit protection cylinder is formed with the receiving unit installation groove, the two ends of the secondary circuit skeleton are sealed with the two ends of the circuit protection cylinder, the secondary circuit skeleton is provided with a secondary circuit installation groove with an opening facing the circuit protection cylinder, the secondary circuit installation groove is located in the sealing area formed by the secondary circuit skeleton and the circuit protection cylinder, and the secondary receiving unit includes a secondary circuit arranged in the secondary circuit installation groove; The two ends of the magnetic core protection tube are respectively sealed and connected to the circuit protection tube, and the secondary receiving unit also includes a secondary coil and a secondary magnetic core limitedly arranged in a closed cavity formed by the circuit protection tube and the magnetic core protection tube, and the two ends of the secondary coil pass through the circuit protection tube to be connected to the secondary circuit, and the secondary circuit is electrically connected to the secondary pin, and the secondary circuit is used to process the electrical signal generated by the secondary coil so that the electrical signal can be transmitted to the control system on the drill rod through the secondary pin.

8. The coupler for coal seam drilling signal transmission according to claim 7, characterized in that: The circuit protection tube includes a secondary circuit skeleton protection tube and a secondary bracket, the secondary circuit skeleton protection tube is sleeved on the outside of the secondary circuit skeleton, the two ends of the secondary circuit skeleton protection tube are sealed and connected to the two ends of the secondary circuit skeleton, the secondary bracket is sleeved on the outside of the secondary circuit skeleton protection tube, the two ends of the secondary bracket are sealed and connected to the two ends of the secondary circuit skeleton protection tube, a first limiting step is arranged on the right side of the secondary circuit skeleton protection tube, the secondary bracket is axially limited between the limiting sleeve and the first limiting step, a second limiting step is arranged on the secondary circuit skeleton on the right side of the first limiting step, and the right inner limiting portion is arranged on the secondary circuit skeleton protection tube between the first limiting step and the second limiting step; A left limiting ring is provided at the left end of the secondary bracket, the magnetic core protection tube is sealedly connected to the left limiting ring, the magnetic core protection tube is sealedly connected to the first limiting step, the receiving unit installation groove is formed between the left limiting ring and the first limiting step, the left end of the magnetic core protection tube is sealedly connected to the left limiting ring, the right end of the magnetic core protection tube is sealedly connected to the first limiting step, a groove structure for wiring is provided on the secondary bracket, and a through hole for the wire between the secondary coil and the secondary circuit to pass through is provided on the secondary circuit skeleton protection tube.

9. The coupler for coal seam drilling signal transmission according to claim 8, characterized in that: The secondary coil is arranged in the secondary coil sleeve, and the secondary magnetic core extends to the two ends of the secondary coil sleeve. A right stopper is arranged between the right end of the secondary coil sleeve, the right end of the secondary magnetic core and the first limiting step, and a left stopper is arranged between the left end of the secondary coil sleeve, the left end of the secondary magnetic core and the left limiting ring.

10. The coupler for coal seam drilling signal transmission according to any one of claims 1 to 9, characterized in that: The gap between the coupler primary structure and the coupler secondary structure is 1 mm; a coolant flow channel is provided in the coupler secondary structure and runs from the left end to the right end, and the upper end of the coolant flow channel is used to connect with the faucet on the drilling platform through a faucet transition piece.

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