Series mechanism locking and inserting connection two-way rotating drill rod

Abstract

The invention provides a series mechanism locking and inserting connection two-way rotating drill rod which comprises a plurality of drill rod units connected in series, and each drill rod unit is composed of a pipe body, a male connector, a female connector and a valve element clamping and locking mechanism. The male connector and the female connector are matched and inserted through a spline or a polyhedron and used for transmitting positive and negative torque. The valve element clamping and locking mechanism comprises a valve element assembly, a driving swing rod and a clamping block, and when the male connector is inserted into the female connector, the driving swing rod pushes the valve element assembly to move and drives the clamping block to stretch into the annular groove of the female connector, so that axial locking of the male connector and the female connector is achieved. During disassembly, the valve element assembly is reset under the action of the return spring, the clamping block is withdrawn, and locking is relieved. The drill rod can effectively solve the problem that a traditional one-way rotating drill rod trips when being fed or pulled back to rotate reversely, forward and reverse rotation is achieved, drill holding accidents are relieved, automatic assembling and disassembling of a drilling machine are supported, manual auxiliary operation is reduced, construction efficiency is improved, and the drill rod is suitable for coal mine underground drilling operation.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine drilling tools and relates to a bidirectional rotating drill rod that is locked and plugged in a serial mechanism. Background Art

[0002] At present, the drill rods used in coal seam drilling operations in coal mines are generally connected with conical threads and can only rotate in one direction. When the phenomenon of hole collapse and drill bit sticking occurs in the drilling construction project, it is necessary to frequently reverse the rotation to buffer and loosen the drill bit, while the ordinary one-way rotating drill rod reversal will cause the drill rod to disengage and cause the drill to drop. In recent years, some drill rods that can run forward and reverse have been developed to solve the drilling construction problem. They are mainly of the following types: one is to use a column in the form of a triangular, hexagonal or other polyhedron to plug and dock with the hole to transmit the forward and reverse torque, and use a key pin or screw for axial positioning connection to transmit the axial load; the other is to use a spline sleeve connection; there are also some other forms of forward and reverse thread combination connection and internal spline socket connection. The above-mentioned two-way rotating drill rods either have poor connection strength or are unstable, and both require manual on-site auxiliary loading and unloading of the drill rods, and cannot realize the automatic loading and unloading of the machine, and use forward and reverse rotation to deal with stuck drill accidents and other problems. Summary of the invention

[0003] In view of this, the object of the present invention is to solve the above-mentioned problem and provide a series 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 locking plug-in connection bidirectional rotating drill rod, comprising a plurality of serially connected drill rod units, wherein the drill rod unit comprises a pipe body, a male joint and a female joint connected to both ends of the pipe body, and a valve core locking mechanism arranged in the pipe body; the male joint and the female joint are straight-insertion structures with splines or polyhedrons, and the male joints and the female joints between adjacent drill rod units are plug-in-fitted and transmit positive and negative torques;

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

[0007] The front end of the male joint is provided with a plurality of circumferentially arranged block holes; the block is arranged in the block hole and slides with the male joint in the radial direction; the valve core assembly passes through the pipe body, one end of which extends into the female joint, and the other end of which is slidably arranged in the male joint and contacts with 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 between the valve core large diameter section and the valve core small diameter section along the slope, and under the push of the slope, the block extends or retracts from the block hole in the radial direction;

[0008] The female connector is provided with an annular groove for clamping the clamping block, and the driving swing rod is located between the annular groove and the valve core assembly; one end of the driving swing rod is rotatably arranged on the side wall of the female connector through a pin shaft, 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 also includes a return spring and a limit sleeve; the inner hole of the male joint is a stepped hole, the limit sleeve is fixedly arranged in the stepped hole, a limit shoulder is arranged in the stepped hole, a limit boss is arranged 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 the 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 the discharge and inflow of liquid 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 separated from the annular groove.

[0016] Furthermore, an opening is provided on the side wall of the female joint, 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 joint fits with the fitting surface on the driving rocker arm to limit the driving rocker arm, thereby preventing the valve core assembly from pushing the driving rocker arm under the action of the return spring, thereby keeping the drill rod units 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 rod. After the drill rods are first connected in place through hexagonal or other matching plug-in connections, the valve core locking mechanism uses the extrusion force of the male joint when the drill rods are connected to achieve locking or unlocking of the drill rods, thereby achieving forward and reverse rotation of the drill rod to buffer and loosen the drill rod to deal with drill sticking accidents. At the same time, the drilling rig can also automatically load and unload the drill rod, providing technical support for truly realizing unmanned drilling construction throughout the entire process on site; it gets rid of manual auxiliary operations and reduces the labor intensity of workers.

[0021] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can 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 in conjunction with the accompanying drawings, wherein:

[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 in the present invention.

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

[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 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 only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

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

[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 the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position 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 , which is a serial mechanism locking plug-in connection bidirectional rotating drill pipe, including multiple serially connected drill pipe units a1, a2, a3...an, each drill pipe unit includes a pipe body 5, a male connector 7 and a female connector 1 connected to both ends of the pipe body 5 by friction welding, and a valve core locking mechanism arranged in the pipe body 5; the male connector 7 and the female connector 1 are spline or polyhedron matched straight plug-in structures, the male connector 7 and the female connector 1 between adjacent drill pipe units are plug-in matched, and transmit 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 with the male connector 7 in the radial direction; the valve core assembly passes through the pipe body 5, one end of which extends into the female connector 1, and the other end is slidably arranged in the male connector 7 and contacts with 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 from the block 11 hole in the radial direction;

[0035] An opening is provided on the side wall of the female connector 1, and the driving rocker 2 is rotatably arranged in the opening, and a sealing block 4 is welded outside the opening to seal the opening. An annular groove for the clamping block 11 is provided inside the female connector 1, and the driving rocker 2 is located between the annular groove and the valve core assembly; one end of the driving rocker 2 is rotatably arranged in the opening of the side wall of the female connector 1 through the pin 3, and the other end extends to the inside 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 to make the driving rocker 2 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 is axially fixedly connected to the female connector 1.

[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, 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 clamping 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 the 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 limiting 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 provided on the side of the annular groove away from the valve core assembly in the female connector 1. The valve core extension rod 6 and the valve core 10 are both hollow structures, and water holes are provided on the end of the valve core extension rod 6 and the valve core 10 respectively for the discharge and inflow of liquid in the inner cavity of the drill rod unit.

[0041] The block 11 is provided with a slot, in which a block pin 12 is provided, which prevents 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 with 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 swing rod 2, so that the valve core 10 of the drill rod unit a2 extends out of the lifting block 11 and is placed in the annular groove of the drill rod unit a3, so that the drill rod unit a2 and the drill rod unit a3 are locked. 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 the drill rod units are removed, the drill rod unit a1 is removed, 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, so that the drill rod unit a2 and the drill rod unit a3 are released. 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 solution of the present invention rather than to limit it. 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 solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A serial mechanism locking plug connection bidirectional rotary drill rod, comprising a plurality of serially connected drill rod units, characterized in that: The drill rod unit includes a pipe body, a male joint and a female joint connected to both ends of the pipe body, and a valve core locking mechanism arranged in the pipe body; the male joint and the female joint are straight-insertion structures matched with splines or polyhedrons, and the male joints and female joints between adjacent drill rod units are plug-fitted and matched, and transmit positive and negative torques; The valve core locking mechanism comprises a valve core assembly, a driving rocker rod and a clamping block; The front end of the male joint is provided with a plurality of circumferentially arranged block holes; the block is arranged in the block hole and slides with the male joint in the radial direction; the valve core assembly passes through the pipe body, one end of which extends into the female joint, and the other end of which is slidably arranged in the male joint and contacts with 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 between the valve core large diameter section and the valve core small diameter section along the slope, and under the push of the slope, the block extends or retracts from the block hole in the radial direction; The female connector is provided with an annular groove for clamping the clamping block, and the driving swing rod is located between the annular groove and the valve core assembly; one end of the driving swing rod is rotatably arranged on the side wall of the female connector through a pin shaft, 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 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.

2. The serial mechanism locking plug connection bidirectional rotary drill pipe according to claim 1 is characterized in that: The valve core locking mechanism also includes a return spring and a limit sleeve; the inner hole of the male joint is a stepped hole, the limit sleeve is fixedly arranged in the stepped hole, a limit shoulder is arranged in the stepped hole, a limit boss is arranged 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 the initial position.

3. The two-way rotating drill pipe locking plug connection of the serial mechanism according to claim 2 is 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, 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.

4. The two-way rotating drill pipe locking plug connection of the serial mechanism according to claim 3 is 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 the discharge and inflow of liquid in the inner cavity of the drill rod unit.

5. The serial mechanism locking plug connection bidirectional rotary drill pipe according to claim 1, characterized in that: The clamping block is provided with a clamping slot, and a clamping block pin is provided in the clamping slot, so that the clamping block is prevented from escaping from the clamping block hole by the clamping block pin.

6. 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.

7. 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 disposed in the opening, and the outer side of the opening is sealed by a sealing block.

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

9. The serial mechanism locking plug connection bidirectional rotary drill pipe according to claim 2, characterized in that: 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 to limit the driving rocker arm, thereby 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.

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