High-precision self-centering anti-loose cable drill rod and locking method thereof

Abstract

The invention relates to a high-precision self-centering anti-loosening through cable drill rod and a locking method thereof, the high-precision self-centering anti-loosening through cable drill rod comprises a drill rod body and a cable core, and a first supporting ring, a sleeve and a second supporting ring are arranged in an inner hole of the drill rod body; the front end of the sleeve is connected with a first connector through threads, and the first supporting ring blocks backward movement of the first connector. The rear end of the sleeve is connected with a second connector through threads, and the second supporting ring blocks forward movement of the second connector. A contact male head in threaded connection with the cable core is arranged in an inner hole of the first connector, a contact female head in threaded connection with the cable core is arranged in an inner hole of the second connector, and the contact female head is matched with the contact male head. The two supporting rings are oppositely pulled under the threaded action of the sleeve and the first connector and the second connector, meanwhile, the conical surfaces are used for limiting relative movement of the two supporting rings, the contact male head and the contact female head are oppositely pulled under the threaded action of the cable core and the contact male head and the contact female head, meanwhile, the limiting structure is arranged, and the overall mechanism is limited; and cable core loosening is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling tools, in particular to a through-cable drill rod, and more particularly to a high-precision self-centering anti-loose through-cable drill rod and a locking method thereof. BACKGROUND

[0002] In the field of directional drilling technology in coal mines, the through-cable directional drill rod, as one of the key components, plays a crucial role. Its main functions are reflected in two aspects: first, to ensure the effective connection between drill rods and maintain the stability of the entire drilling system structure; second, to ensure the automation, stability and reliability of internal through-cable connection, providing strong support for data transmission and power supply during directional drilling. In recent years, with the rapid development of directional drilling automation technology, automatic directional drilling machines have gradually become the mainstream equipment in the industry. This trend has put new adaptive requirements on the through-cable drill rod, which requires it to perfectly match the automatic make-up and break-out operations of the automatic directional drilling machine, thereby achieving efficient automation of drilling operations. However, the traditional through-cable drill rod has exposed many problems in practical application, such as low installation precision and poor anti-loose performance, making it difficult to meet the operational requirements of automatic directional drilling machines in terms of automation and stability. Specifically, during the processing and assembly of traditional through-cable drill rods, certain tolerances or assembly gaps are inevitably generated. If the cumulative error is too large, it will have a serious impact on the performance and signal transmission function of the through-cable drill rod. When the automatic directional drilling machine performs drill rod screwing or unscrewing operations, the traditional through-cable drill rod's central through-cable contact will generate a certain amount of friction between the cable connection seat and the cable connector, which not only affects the normal operation of the drill rod, but also poses a serious threat to the connection stability of the central through-cable. Due to the action of friction, the connections of the central through-cable are prone to relative rotation, which in turn causes the internal through-cable connection to gradually loosen. Once the through-cable connection loosens, it not only interferes with the accurate transmission of data, but also may cause major problems such as power supply interruption, significantly reducing the efficiency and safety of directional drilling operations.

[0003] In summary, the traditional through-cable drill rod has obvious shortcomings in the application scenario of automatic directional drilling machines, making it difficult to adapt to the development direction of directional drilling automation technology. Therefore, it is of great practical significance to develop a new type of through-cable drill rod that can adapt to automatic directional drilling machines. SUMMARY

[0004] The present application provides a high-precision self-centering anti-loose through-cable drill rod and a locking method thereof, which solves the problem of easy loosening of the central through-cable in the operation of the traditional through-cable drill rod in the automatic directional drilling machine.

[0005] This invention is achieved through the following technical solution: a high-precision self-centering anti-loosening cable drill rod is provided, comprising a drill rod body and a cable core. The drill rod body has a first support ring, a sleeve, and a second support ring arranged axially from front to back in the inner hole, as well as a limiting part that restricts the relative movement of the first and second support rings. The front end of the sleeve is threadedly connected to a first connector that passes forward through the first support ring, and the first support ring blocks the backward movement of the first connector. The rear end of the sleeve is threadedly connected to a second connector that passes backward through the second support ring, and the second support ring blocks the forward movement of the second connector. The cable core passes forward from the inner hole of the sleeve to the inner hole of the first connector and backward to the inner hole of the second connector. The inner hole of the first connector has a male contact head that is threadedly connected to the front end of the cable core, and a limiting structure that restricts the backward movement of the male contact head. The inner hole of the second connector has a female contact head that is threadedly connected to the rear end of the cable core, and a limiting structure that restricts the forward movement of the female contact head. The female contact head is compatible with the male contact head.

[0006] After installation, the sleeve exerts a pulling force on the first and second support rings under the action of the threads at both ends, causing them to move closer together. At the same time, the limiting part restricts the movement of the first and second support rings, achieving primary locking. The cable core exerts a pulling force on the male and female contact heads under the action of the threads at both ends, causing them to move closer together. At the same time, the first and second joints restrict the movement of the male and female contact heads, achieving secondary locking, thus avoiding the problem of cable core loosening.

[0007] As an optimization, the limiting part includes a first conical surface that is larger at the front and smaller at the back, and a second conical surface that is smaller at the front and larger at the back. The outer surface of the first support ring is adapted to the first conical surface, and the outer surface of the second support ring is adapted to the second conical surface. This optimized solution uses the first and second conical surfaces to block the relative movement of the first and second support rings. The structure is simple and reliable. Moreover, the tighter the connecting threads of the casing to the first and second joints are tightened, the greater the friction between the first and second support rings and the drill pipe body, and the better the locking and fixing effect.

[0008] As an optimization, a limiting platform is fixed to the outer wall of the first connector, extending axially to the front side of the first support ring. The inner hole of the first connector includes holes I, II, III, and IV arranged sequentially from front to back, with the diameters of holes I, II, III, and IV decreasing sequentially. The diameter of hole IV matches the outer diameter of the cable core. The connection between the male contact head and the cable core is located in hole III, and the diameter of hole I matches the outer diameter of the rear end of the second connector. This optimized scheme utilizes the limiting platform on the first connector to prevent the first support ring from moving backward. The structure is simple and reliable. Setting the inner hole of the first connector into four segments with sequentially changing diameters facilitates the threaded connection between the male contact head and the cable core, limits the backward movement of the male contact head, and facilitates connection with the second connector and female contact head in the adjacent drill pipe body.

[0009] As an optimization, the male contact connector includes a main block, a contact rod extending forward from the main block, and a connecting sleeve extending backward from the main block. The outer diameter of the connecting sleeve is smaller than the outer diameter of the main block. The step formed by the connecting sleeve and the main block pushes backward axially to the step formed by holes II and III. The connecting sleeve is threaded to the cable core, and the contact rod is adapted to the inner hole of the female contact connector. This optimized male contact connector utilizes the step formed by the diameter difference to restrict its backward movement, resulting in a reliable effect.

[0010] As an optimization, a limiting platform is fixed to the outer wall of the second connector, extending axially to the rear side of the second support ring. The inner hole of the second connector includes a first hole segment and a second hole segment located behind the first hole segment. The diameter of the first hole segment is smaller than the diameter of the second hole segment. The diameter of the first hole segment matches the outer diameter of the cable core, and the diameter of the second hole segment matches the outer diameter of the contact female head. The front end face of the contact female head extends axially to the stepped surface formed by the first and second hole segments. This optimized solution, by setting a limiting platform on the second connector and using the second support ring to block the limiting platform, effectively restricts the forward movement of the second connector. The effect is reliable, the structure is simple, and the inner hole structure of the second connector facilitates the threaded connection between the contact female head and the cable core while reliably limiting the forward movement of the contact female head.

[0011] This solution also provides a high-precision self-centering anti-loosening cable-stayed drill rod locking method, including the following steps: a. Pass the first connector through the first support ring, and thread one end of the first connector through the first support ring to one end of the sleeve. Insert the cable core from the other end of the sleeve, and insert the male contact head from the end of the first connector away from the sleeve. Thread the male contact head to the cable core to form the first pre-assembled body. b. Insert the first pre-installed body from the front end of the drill pipe body hole to the outer side of the first support ring and abut against the first conical surface, with the male contact head located in front of the casing; c. Insert the second connector through the second support ring to form the second pre-assembled body, and insert the second pre-assembled body from the rear end of the drill pipe body hole to the outer side of the second support ring and abut against the second conical surface. Thread one end of the second connector through the second support ring to the rear end of the casing. Locking is achieved by using the obstruction of the relative movement of the first and second conical surfaces and the tension of the casing on the first and second support rings under the action of the threads. d. Insert the female contact head into the rear end of the second connector and connect the female contact head to the rear end of the cable core via threads. Under the action of the threads, the cable core generates a pulling force that tends to move relative to the male and female contact heads. The first and second connectors respectively block the relative movement of the male and female contact heads, thus achieving secondary locking.

[0012] The beneficial effects of this invention are as follows: 1. The two support rings are pulled against each other by the thread action of the sleeve and the first and second joints. At the same time, the relative movement of the two support rings is restricted by the conical surface. The male and female contact heads are pulled against each other by the thread action of the cable core and the male and female contact heads. Meanwhile, the male and female contact heads are set with a limiting structure in the first and second joints to limit the relative movement of the male and female contact heads, so as to limit the overall movement of the mechanism and prevent the cable core from loosening. 2. By setting the two support rings to contact the drill rod body through a conical surface, a tight fit can be achieved, which can realize high positioning accuracy, ensure the accurate position of the workpiece during assembly or processing, and improve the precision of the cable drill rod. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Enlarged view of a portion of the image; As shown in the figure: 1. First connector, 2. Male contact connector, 3. Sleeve, 4. Cable core, 5. Second connector, 6. Female contact connector, 7. Second support ring, 8. First support ring, 9. Drill rod body. Detailed Implementation

[0014] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0015] like Figure 1 The high-precision self-centering anti-loosening cable drill rod shown includes a drill rod body 9 and a cable core 4. The drill rod body has an inner hole that runs through the front and rear along the axial direction. The outer side wall of the front end of the drill rod body is provided with an external tapered thread, and the rear end of the inner hole of the drill rod body is provided with an internal tapered thread.

[0016] The drill pipe body has a first support ring 8, a sleeve 3 and a second support ring 7 arranged axially from front to back in the inner hole, as well as a limiting part that restricts the relative movement of the first support ring and the second support ring. The first support ring and the second support ring are coaxial with the inner hole of the drill pipe body.

[0017] The limiting part in this embodiment includes a first conical surface that is larger in the front and smaller in the back, and a second conical surface that is smaller in the front and larger in the back. The outer side of the first support ring is adapted to the first conical surface, and the outer side of the second support ring is adapted to the second conical surface. The outer side of the first support ring is a conical surface that is larger in the front and smaller in the back, and the outer side of the second support ring is a conical surface that is smaller in the front and larger in the back.

[0018] The front end of the sleeve is threadedly connected to a first connector 1 that passes forward through a first support ring 8. The first support ring 8 blocks the backward movement of the first connector 1. The rear end of the sleeve 3 is threadedly connected to a second connector 5 that passes backward through a second support ring 7. The second support ring 7 blocks the forward movement of the second connector 5. When the first and second connectors are tightened, under the action of the threaded connection with the sleeve, the first connector generates a backward thrust on the first support ring, and the second connector generates a forward thrust on the second support ring, so that the first and second connectors are tightly pressed against the first and second conical surfaces, respectively.

[0019] The cable core 4 is axially extended forward from the inner hole of the sleeve to the inner hole of the first joint, and axially extended backward to the inner hole of the second joint. The inner hole of the first joint has a male contact head 2 that is threadedly connected to the front end of the cable core, and a limiting structure to restrict the backward movement of the male contact head. The inner hole of the second joint has a female contact head 6 that is threadedly connected to the rear end of the cable core, and a limiting structure to restrict the forward movement of the female contact head. The female contact head and the male contact head are compatible. After the two adjacent drill pipe bodies are connected, the rear end of the second joint extends into the first joint of the rear drill pipe body, and the male contact head extends into the female contact head and contacts it, achieving cable core conductivity within the adjacent drill pipe bodies.

[0020] The outer wall of the first connector is fixed with a limiting platform that extends axially to the front side of the first support ring. The inner hole of the first connector includes holes I, II, III and IV arranged sequentially from front to back. The diameters of holes I, II, III and IV decrease sequentially. The diameter of hole IV is adapted to the outer diameter of the cable core. The connection between the male contact head and the cable core is located in hole III. The diameter of hole I is adapted to the outer diameter of the rear end of the second connector.

[0021] The male contact head includes a main body, a contact rod extending forward from the main body, and a connecting sleeve extending backward from the main body. The outer diameter of the connecting sleeve is smaller than the outer diameter of the main body. The step formed by the connecting sleeve and the main body pushes backward along the axial direction to the step formed by hole II and hole III. The connecting sleeve is connected to the cable core by a thread, and the contact rod is adapted to the inner hole of the female contact head.

[0022] The outer wall of the second connector is fixed with a limiting platform that extends axially to the rear side of the second support ring. The inner hole of the second connector includes a first hole segment and a second hole segment located behind the first hole segment. The diameter of the first hole segment is smaller than the diameter of the second hole segment. The diameter of the first hole segment is adapted to the outer diameter of the cable core, and the diameter of the second hole segment is adapted to the outer diameter of the contact female head. The front end face of the contact female head extends axially to the stepped surface formed by the first hole segment and the second hole segment. In this embodiment, the contact female head is cylindrical.

[0023] To meet usage requirements, the first connector in this embodiment is a nylon female connector, the second connector is a nylon male connector, and the sleeve is a nylon sleeve. The cable core is a copper cable core, with external threads at both ends, which connect to the internal threaded holes of the male and female connectors via threads for tightening. The outer cylindrical surface of the copper cable core contacts and mates with the inner hole of the nylon sleeve. To facilitate tightening of the male and female connectors, internal hexagonal holes are provided in both connectors.

[0024] In this embodiment, the self-locking mechanism is as follows: the internal threaded holes of the female and male contact heads are connected to the external threads of the copper cable core. A locking force is applied through the internal hexagonal holes of the male and female contact heads to lock the copper cable core. The locking force is transmitted to the first and second support rings, whose conical surfaces mate with the conical surface of the drill pipe's internal bore, achieving overall locking of the mechanism. Under the action of the locking force, the two conical surfaces achieve a high-precision locking fit.

[0025] This embodiment describes a high-precision self-centering anti-loosening cable-stayed drill rod locking method, comprising the following steps: a. Pass the first connector through the first support ring, and thread one end of the first connector through the first support ring to one end of the sleeve. Insert the cable core from the other end of the sleeve, and insert the male contact head from the end of the first connector away from the sleeve. Thread the male contact head to the cable core to form the first pre-assembled body. b. Insert the first pre-installed body from the front end of the drill pipe body hole to the outer side of the first support ring and abut against the first conical surface, with the male contact head located in front of the casing; c. Insert the second connector through the second support ring to form the second pre-assembled body, and insert the second pre-assembled body from the rear end of the drill pipe body hole to the outer side of the second support ring and abut against the second conical surface. Thread one end of the second connector through the second support ring to the rear end of the casing. Locking is achieved by using the obstruction of the relative movement of the first and second conical surfaces and the tension of the casing on the first and second support rings under the action of the threads. d. Insert the female contact head into the rear end of the second connector and connect the female contact head to the rear end of the cable core via threads. Under the action of the threads, the cable core generates a pulling force that tends to move relative to the male and female contact heads. The first and second connectors respectively block the relative movement of the male and female contact heads, thus achieving secondary locking.

[0026] This invention addresses the problem of loosening of the central cable during the setup and dismounting processes of automatic directional drilling rigs by effectively solving this issue through a conical surface embedding design of the parts. Traditional drill rods are prone to loosening due to friction when tightening or unscrewing threads, affecting drilling stability. This solution utilizes the friction generated by the conical surface fit to achieve axial fixation, ensuring a stable cable connection and significantly improving operational safety. Furthermore, the conical surface design, utilizing the principle of friction, allows for free assembly and disassembly of the workpiece within a certain range without affecting its performance. This effectively reduces processing and assembly difficulty, saves costs, and significantly improves the stability of the cable drill rod, increasing operational efficiency. The tight conical surface fit achieves high positioning accuracy, ensuring the accurate position of the workpiece during assembly or processing, improving the precision of the cable drill rod. The stable conical structure can resist impacts and vibrations during mold closing, enhancing the overall operational reliability.

[0027] The cable-stayed drill pipe of this invention significantly improves the drilling efficiency and safety of automatic directional drilling rigs through its self-locking technology, ensuring the realization of the self-locking function of the cable-stayed drill pipe. It is suitable for complex working conditions such as directional drilling in coal mines. This solution combines practicality and advancement, and can be widely applied in fields such as automatic directional drilling rigs, promoting the automation of drilling technology and possessing broad application prospects and high practical value.

[0028] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A high-precision self-centering anti-loosening cable drill rod, comprising a drill rod body (9) and a cable core (4), characterized in that: The drill rod body has a first support ring (8), a sleeve (3) and a second support ring (7) arranged sequentially from front to back along the axial direction in the inner hole, as well as a limiting part that restricts the relative movement of the first support ring and the second support ring. The front end of the sleeve is connected by a threaded connection to a first connector (1) that passes forward through the first support ring, and the first support ring (8) blocks the backward movement of the first connector (1); the rear end of the sleeve (3) is connected by a threaded connection to a second connector (5) that passes backward through the second support ring (7), and the second support ring (7) blocks the forward movement of the second connector (5). The cable core (4) is inserted forward from the inner hole of the sleeve to the inner hole of the first connector and backward to the inner hole of the second connector. The inner hole of the first connector is provided with a male contact head (2) that is threadedly connected to the front end of the cable core, and a limiting structure that restricts the male contact head from moving backward. The inner hole of the second connector is provided with a female contact head (6) that is threadedly connected to the rear end of the cable core, and a limiting structure that restricts the female contact head from moving forward. The female contact head and the male contact head are compatible.

2. The high-precision self-centering anti-loosening cable-passing drill rod according to claim 1, characterized in that: The limiting part includes a first conical surface that is larger in the front and smaller in the back, and a second conical surface that is smaller in the front and larger in the back. The outer side of the first support ring is adapted to the first conical surface, and the outer side of the second support ring is adapted to the second conical surface.

3. A high-precision self-centering anti-loosening cable-passing drill rod according to claim 1, characterized in that: The outer wall of the first connector is fixed with a limiting platform that extends axially to the front side of the first support ring. The inner hole of the first connector includes holes I, II, III and IV arranged sequentially from front to back. The diameters of holes I, II, III and IV decrease sequentially. The diameter of hole IV is adapted to the outer diameter of the cable core. The connection between the male contact head and the cable core is located in hole III. The diameter of hole I is adapted to the outer diameter of the rear end of the second connector.

4. A high-precision self-centering anti-loosening cable-passing drill rod according to claim 3, characterized in that: The male contact head includes a main block, a contact rod extending forward from the main block, and a connecting sleeve extending backward from the main block. The outer diameter of the connecting sleeve is smaller than the outer diameter of the main block. The step formed by the connecting sleeve and the main block pushes backward along the axial direction to the step formed by hole II and hole III. The connecting sleeve is connected to the cable core by a thread, and the contact rod is adapted to the inner hole of the female contact head.

5. A high-precision self-centering anti-loosening cable-passing drill rod according to claim 3, characterized in that: The outer wall of the second connector is fixed with a limiting platform that pushes axially to the rear side of the second support ring. The inner hole of the second connector includes a first hole section and a second hole section located behind the first hole section. The diameter of the first hole section is smaller than the diameter of the second hole section. The diameter of the first hole section is adapted to the outer diameter of the cable core. The diameter of the second hole section is adapted to the outer diameter of the contact female head. The front end face of the contact female head pushes axially to the stepped surface formed by the first hole section and the second hole section.

6. A locking method for a high-precision self-centering anti-loosening cable-stayed drill rod according to any one of claims 1 to 5, characterized in that, Includes the following steps: a. Pass the first connector through the first support ring, and thread one end of the first connector through the first support ring to one end of the sleeve. Insert the cable core from the other end of the sleeve, and insert the male contact head from the end of the first connector away from the sleeve. Thread the male contact head to the cable core to form the first pre-assembled body. b. Insert the first pre-installed body from the front end of the drill pipe body hole to the outer side of the first support ring and abut against the first conical surface, with the male contact head located in front of the casing; c. Insert the second connector through the second support ring to form the second pre-assembled body, and insert the second pre-assembled body from the rear end of the drill pipe body hole to the outer side of the second support ring and abut against the second conical surface. Thread one end of the second connector through the second support ring to the rear end of the casing. Locking is achieved by using the obstruction of the relative movement of the first and second conical surfaces and the tension of the casing on the first and second support rings under the action of the threads. d. Insert the female contact head into the rear end of the second connector and connect the female contact head to the rear end of the cable core via threads. Under the action of the threads, the cable core generates a pulling force that tends to move relative to the male and female contact heads. The first and second connectors respectively block the relative movement of the male and female contact heads, thus achieving secondary locking.

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