Tandem locking plug-in connection for bidirectional rotary drill pipe

Abstract

The present invention provides a bidirectional rotary drill rod with a locking plug-in connection of a serial mechanism, comprising a plurality of serially connected drill rod units, wherein the drill rod unit is composed of a pipe body, a male connector, a female connector and a valve core locking mechanism. The male connector and the female connector are plugged in through a spline or a polyhedron, and are used to transmit positive and negative torques; the valve core locking mechanism includes a valve core assembly, a driving rocker arm and a clamping block. When the male connector is inserted into the female connector, the driving rocker arm pushes the valve core assembly to move, driving the clamping block to extend into the annular groove of the female connector, thereby realizing axial locking of the male and female connectors. During disassembly, the valve core assembly is reset under the action of a return spring, the clamping block is retracted, and the lock is released. The drill rod can effectively solve the problem of traditional unidirectional rotary drill rods being tripped during feeding or pulling back and reversing, realizes positive and reverse rotation to alleviate drill-binding accidents, supports automatic loading and unloading of drilling rigs, reduces manual auxiliary operations, improves construction efficiency, and is suitable for underground drilling operations in coal mines.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine drilling tools and relates to a bidirectional rotating drill rod connected by a serial mechanism with locking and plugging. Background Art

[0002] Currently, drill rods used in underground coal seam drilling operations generally feature tapered threaded connections that can only rotate in one direction. When the drill rod is stuck during drilling operations, frequent forward and reverse rotation is required to buffer and loosen the hole. However, reverse rotation of conventional one-way rotating drill rods can cause the drill rod to disengage, leading to drill drop accidents. In recent years, several types of forward and reverse rotating drill rods have been developed to address these drilling problems. These types primarily fall into the following categories: one uses a polyhedral column, such as a triangular or hexagonal one, to connect with the hole to transmit forward and reverse torque, with a key or screw for axial positioning and load transfer; another uses a splined sleeve connection; and still other types include combined forward and reverse threaded connections and internal splined socket connections. These bidirectionally rotating drill rods either suffer from weak or unstable joints and require manual on-site assembly and disassembly. Automated assembly and disassembly by machines is not possible, requiring forward and reverse rotation to address drill jams and other issues. Summary of the Invention

[0003] In view of this, the object of the present invention is to solve the above problems and provide a serial mechanism for locking and plugging a bidirectional rotating drill rod.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A serial mechanism for locking and plug-in connection of bidirectional rotary drill pipes comprises a plurality of serially connected drill pipe units, each comprising a pipe body, a male connector and a female connector connected to both ends of the pipe body, and a valve core locking mechanism disposed within the pipe body; the male connector and the female connector are splined or polyhedron-matched plug-in structures, and the male connectors and female connectors of adjacent drill pipe units are plug-fitted and transmit forward and reverse torque;

[0006] The valve core locking mechanism includes a valve core assembly, a driving rocker arm, and a clamping block;

[0007] The front end of the male connector is provided with a plurality of circumferentially arranged block holes; the block is arranged in the block hole and radially slides with the male connector; the valve core assembly passes through the pipe body, one end extends into the female connector, and the other end is slidably arranged in the male connector and contacts the end face of the block; the valve core assembly is provided with a valve core large diameter section and a valve core small diameter section, and a slope is provided between the valve core large diameter section and the valve core small diameter section. When the valve core assembly moves axially, the block slides along the slope between the valve core large diameter section and the valve core small diameter section, and is pushed by the slope to extend or retract radially from the block hole;

[0008] An annular groove for engaging the clamping block is provided in the female connector, and the driving rocker arm is located between the annular groove and the valve core assembly; one end of the driving rocker arm is rotatably mounted on the side wall of the female connector via a pin, and the other end extends into the interior of the female connector and abuts against the end of the valve core assembly;

[0009] When the male connector of the adjacent drill rod unit is inserted into the female connector, the front end of the male connector pushes the driving rocker arm, causing the driving rocker arm to swing around the pin shaft, thereby pushing the valve core assembly to move axially; the clamping block is driven by the valve core assembly to be clamped into the annular groove, so that the male connector and the female connector are axially fixedly connected.

[0010] Furthermore, the valve core locking mechanism further includes a return spring and a limit sleeve; the inner hole of the male connector is a stepped hole, the limit sleeve is fixedly arranged in the stepped hole, a limit shoulder is provided in the stepped hole, a limit boss is provided on the valve core assembly, and the limit boss is located between the limit sleeve and the limit shoulder; the return spring is sleeved on the valve core assembly, one end of the return spring abuts against the limit shoulder, and the other end abuts against the limit boss;

[0011] When the drill pipe is disassembled, the valve core assembly moves along the axis under the action of the return spring, so that the block returns from the large-diameter section of the valve core to the small-diameter section of the valve core. At the same time, the valve core assembly drives the driving rocker to swing back to its initial position.

[0012] Furthermore, the valve core assembly includes a valve core extension rod and a valve core, the valve core extension rod is connected to the valve core, the valve core large diameter section, the valve core small diameter section, and the limiting boss are all located on the valve core, one end of the valve core extension rod is connected to the valve core large diameter section, and the other end is against the driving rocker arm.

[0013] Furthermore, the valve core extension rod and the valve core are both hollow structures, and water holes are respectively provided on the end of the valve core extension rod and the valve core for discharging and flowing in the inner cavity of the drill rod unit.

[0014] Furthermore, a card slot is provided on the card block, and a card block pin is provided in the card slot, so that the card block is prevented from escaping from the card block hole by the card block pin.

[0015] Furthermore, one end of the clamping block that contacts the valve core assembly is a flat bottom surface, and the other end is chamfered along the axial direction of the valve core assembly to facilitate the clamping block to be inserted into or out of the annular groove.

[0016] Furthermore, an opening is provided on the side wall of the female connector, the driving rocker arm is rotatably disposed in the opening, and the outer side of the opening is sealed by a sealing block.

[0017] Furthermore, a sealing ring is provided in the female connector on a side of the annular groove away from the valve core assembly.

[0018] Furthermore, a fitting surface is provided on the driving rocker arm. When the drill rod unit is connected in place, the outer circle of the male connector fits with the fitting surface on the driving rocker arm, limiting the driving rocker arm and preventing the valve core assembly from pushing the driving rocker arm under the action of the return spring, so that the drill rod units remain in a locked state.

[0019] The beneficial effects of the present invention are:

[0020] The present invention adds a valve core locking mechanism inside an ordinary one-way plug-in drill pipe. After the drill pipes are first connected in place through a hexagonal plug-in connection, the valve core locking mechanism utilizes the squeezing force of the male joint when the drill pipes are connected to lock or unlock the drill pipes, thereby achieving forward and reverse rotation of the drill pipe to buffer and loosen the pipe and deal with drill sticking accidents. At the same time, the drilling rig can also automatically load and unload the drill pipe, providing technical support for truly realizing unmanned drilling construction on site throughout the entire process; it gets rid of manual auxiliary operations and reduces the labor intensity of workers.

[0021] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0023] Figure 1 It is a structural schematic diagram of a single drill rod unit of a bidirectionally rotatable drill rod locked and plugged in a series mechanism according to the present invention.

[0024] Figure 2 It is a schematic diagram of the serial connection of the bidirectional rotating drill rods with locking plug connection in the series mechanism of the present invention.

[0025] Figure 3 for Figure 2 BB cross-sectional view of the mating position of the middle clamping block and the annular groove.

[0026] Figure 4 Schematic diagram of the spline connection between the male connector and the female connector.

[0027] Figure 5 This is a partial enlarged view of the cooperation between the driving pendulum block and the male connector.

[0028] Figure markings: 1-female connector; 2-driving rocker arm; 3-pin shaft; 4-sealing block; 5-tube body; 6-valve core extension rod; 7-male connector; 8-limiting sleeve; 9-return spring; 10-valve core; 11-block; 12-block pin. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0030] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] Please refer to Figures 1 to 5 The invention relates to a bidirectional rotary drill pipe with a locking plug-in connection mechanism in series, comprising a plurality of serially connected drill pipe units a1, a2, a3, ..., an. Each drill pipe unit comprises a tubular body 5, a male connector 7 and a female connector 1 connected to the tubular body 5 at both ends by friction welding, and a valve core locking mechanism disposed within the tubular body 5. The male connector 7 and the female connector 1 are of a straight-plug structure with splines or polyhedrons. The male connectors 7 and female connectors 1 between adjacent drill pipe units plug in and mate, transmitting positive and negative torque.

[0033] The valve core locking mechanism includes a valve core assembly, a driving rocker 2, and a clamping block 11;

[0034] Among them, the front end of the male connector 7 is provided with a plurality of circumferentially arranged block 11 holes; the block 11 is arranged in the block 11 hole and slides radially with the male connector 7; the valve core assembly passes through the pipe body 5, one end extends into the female connector 1, and the other end is slidably arranged in the male connector 7 and contacts the end face of the block 11; the valve core assembly is provided with a valve core large diameter section and a valve core small diameter section, and a slope is provided between the valve core large diameter section and the valve core small diameter section. When the valve core assembly moves axially, the block 11 slides along the slope between the valve core large diameter section and the valve core small diameter section, and under the push of the slope, the block 11 extends or retracts radially from the block 11 hole;

[0035] The sidewall of the female connector 1 is provided with an opening, into which the driving rocker arm 2 is pivotally mounted. A sealing block 4 is welded to the outside of the opening to seal it. An annular groove for engaging the clamping block 11 is provided within the female connector 1, with the driving rocker arm 2 positioned between the groove and the valve core assembly. One end of the driving rocker arm 2 is pivotally mounted in the opening in the sidewall of the female connector 1 via a pin 3, while the other end extends into the interior of the female connector 1 and abuts against the end of the valve core assembly.

[0036] The length of the male connector 7 is longer than the hole depth of the female connector 1, ensuring that the block 11 on the male connector 7 can enter the annular groove; when the male connector 7 of the adjacent drill rod unit is inserted into the female connector 1, the front end of the male connector 7 pushes the driving rocker 2, causing the driving rocker 2 to swing around the pin 3, thereby pushing the valve core assembly to move axially; the block 11 is driven by the valve core assembly to be stuck in the annular groove, so that the male connector 7 and the female connector 1 are axially fixedly connected.

[0037] The valve core locking mechanism also includes a return spring 9 and a limit sleeve 8; the inner hole of the male connector 7 is a stepped hole, the limit sleeve 8 is fixedly arranged in the stepped hole, a limit shoulder is arranged in the stepped hole, and a limit boss is arranged on the valve core assembly, and the limit boss is located between the limit sleeve 8 and the limit shoulder; the return spring 9 is sleeved on the valve core assembly, one end of the return spring 9 is against the limit shoulder, and the other end is against the limit boss. When the return spring 9 is extended, the axial movement position of the valve core assembly is limited by the limit sleeve 8.

[0038] When the drill pipe is disassembled, the valve core assembly moves along the axis under the action of the return spring 9, so that the block 11 returns from the large diameter section of the valve core to the small diameter section of the valve core. At the same time, the valve core assembly drives the driving rocker 2 to swing back to its initial position.

[0039] The valve core assembly includes a valve core extension rod 6 and a valve core 10. The valve core extension rod 6 is a welded component. The valve core extension rod 6 and the valve core 10 are connected by threads. The large diameter section of the valve core 10, the small diameter section of the valve core 10, and the limit boss are all located on the valve core 10. One end of the valve core extension rod 6 is connected to the large diameter section of the valve core 10, and the other end is against the driving rocker arm 2.

[0040] A sealing ring is installed in the female connector 1, on the side of the annular groove away from the valve core assembly. The valve core extension rod 6 and valve core 10 are both hollow structures. The end of the valve core extension rod 6 and the valve core 10 are respectively provided with water holes for the discharge and inflow of liquid in the drill rod unit cavity.

[0041] The block 11 is provided with a slot, in which a block pin 12 is provided to prevent the block 11 from coming out of the hole of the block 11. The end of the block 11 in contact with the valve core assembly is a flat bottom surface, and the other end is chamfered along the axial direction of the valve core assembly.

[0042] A fitting surface is provided on the driving rocker arm 2. When the drill rod unit is connected in place, the outer circle of the male connector 7 fits into the fitting surface on the driving rocker arm 2, limiting the driving rocker arm 2 and preventing the valve core assembly from pushing the driving rocker arm 2 under the action of the return spring 9, so that the drill rod units remain in a locked state.

[0043] When the present invention is in use, after the drill rod unit a2 is connected to the drill rod unit a3, and then connected to the drill rod unit a1, when the male connector 7 of the drill rod unit a1 is inserted into the female connector 1 of the drill rod unit a2, the front part of the male connector 7 of the drill rod unit a1 continuously presses the valve core extension rod 6 in the drill rod unit a2 by driving the rocker rod 2, so that the valve core 10 of the drill rod unit a2 extends out to lift the block 11 and is placed in the annular groove of the drill rod unit a3, thereby realizing the locking of the drill rod unit a2 and the drill rod unit a3. At this time, the large diameter section of the valve core is located at Below the blocking block 11, the drill rod unit is in a forward and reverse construction state; when N drill rod units are continuously connected in series, the connected N-1 drill rod units can be locked in series; when removing the drill rod units, remove the drill rod unit a1, and the valve core 10 of the valve core locking mechanism of the drill rod unit a1 is reset under the action of the return spring 9, realizing the unlocking between the drill rod unit a2 and the drill rod unit a3. At this time, the drill rod unit a2 is in a detachable state, and the drill rod unit a2 can be removed. Repeat the operation to remove the subsequent N drill rod units.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A serial mechanism locking plug connection bidirectional rotary drill pipe, comprising a plurality of serially connected drill pipe units, characterized in that: The drill rod unit includes a pipe body, a male connector and a female connector connected to both ends of the pipe body, and a valve core locking mechanism provided in the pipe body; the male connector and the female connector are splined or polyhedron-matched plug-in structures, and the male connectors and female connectors of adjacent drill rod units are plug-fitted and transmit positive and negative torque; The valve core locking mechanism includes a valve core assembly, a driving rocker arm, and a clamping block; The front end of the male connector is provided with a plurality of circumferentially arranged block holes; the block is arranged in the block hole and radially slides with the male connector; the valve core assembly passes through the pipe body, one end extends into the female connector, and the other end is slidably arranged in the male connector and contacts the end face of the block; the valve core assembly is provided with a valve core large diameter section and a valve core small diameter section, and a slope is provided between the valve core large diameter section and the valve core small diameter section. When the valve core assembly moves axially, the block slides along the slope between the valve core large diameter section and the valve core small diameter section, and is pushed by the slope to extend or retract radially from the block hole; An annular groove for engaging the clamping block is provided in the female connector, and the driving rocker arm is located between the annular groove and the valve core assembly; one end of the driving rocker arm is rotatably mounted on the side wall of the female connector via a pin, and the other end extends into the interior of the female connector and abuts against the end of the valve core assembly; When the male connector of the adjacent drill rod unit is inserted into the female connector, the front end of the male connector pushes the driving rocker, causing the driving rocker to swing around the pin shaft, thereby pushing the valve core assembly to move axially; the clamping block is clamped into the annular groove under the drive of the valve core assembly, so that the male connector and the female connector are axially fixedly connected; The valve core locking mechanism also includes a return spring and a limit sleeve; the inner hole of the male connector is a stepped hole, the limit sleeve is fixedly arranged in the stepped hole, a limit shoulder is provided in the stepped hole, and a limit boss is provided on the valve core assembly, and the limit boss is located between the limit sleeve and the limit shoulder; the return spring is sleeved on the valve core assembly, one end of the return spring abuts against the limit shoulder, and the other end abuts against the limit boss; When the drill pipe is disassembled, the valve core assembly moves along the axis under the action of the return spring, so that the block returns from the large-diameter section of the valve core to the small-diameter section of the valve core. At the same time, the valve core assembly drives the driving rocker to swing back to its initial position; The driving rocker arm is provided with a fitting surface. When the drill rod unit is connected in place, the outer circle of the male joint fits with the fitting surface on the driving rocker arm, limiting the driving rocker arm and preventing the valve core assembly from pushing the driving rocker arm under the action of the return spring, so that the drill rod units remain in a locked state.

2. The serial mechanism locking plug connection bidirectional rotary drill pipe according to claim 1, characterized in that: The valve core assembly includes a valve core extension rod and a valve core. The valve core extension rod is connected to the valve core. The valve core large diameter section, valve core small diameter section, and limiting boss are all located on the valve core. One end of the valve core extension rod is connected to the valve core large diameter section, and the other end is against the driving rocker arm.

3. The serial mechanism locking plug connection bidirectional rotary drill pipe according to claim 2, characterized in that: The valve core extension rod and the valve core are both hollow structures. The end of the valve core extension rod and the valve core are respectively provided with water holes for discharging and flowing in the inner cavity of the drill rod unit.

4. The serial mechanism locking plug connection bidirectional rotary drill pipe according to claim 1, characterized in that: A card slot is provided on the card block, and a card block pin is provided in the card slot to prevent the card block from escaping from the card block hole through the card block pin.

5. The serial mechanism locking plug connection bidirectional rotary drill pipe according to claim 1, characterized in that: One end of the clamping block in contact with the valve core assembly is a flat bottom surface, and the other end is chamfered along the axial direction of the valve core assembly.

6. The serial mechanism locking plug connection bidirectional rotary drill pipe according to claim 1, characterized in that: An opening is provided on the side wall of the female joint, the driving rocker arm is rotatably arranged in the opening, and the outer side of the opening is sealed by a sealing block.

7. The serial mechanism locking plug connection bidirectional rotary drill pipe according to claim 1, characterized in that: A sealing ring is provided in the female joint at a side of the annular groove away from the valve core assembly.

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