A power head and vise double floating mechanism and horizontal directional drilling rig

Abstract

The present invention relates to the technical field of construction protection for power head vises, and specifically to a power head and vise double floating mechanism and a horizontal directional drilling rig. The double floating mechanism comprises: a drill rig, on which a vise and a power head are relatively arranged; a rotating box, which is slidably arranged in a guide groove on the power head along the extension direction of the drill rig, and is used to slide a first floating distance toward one side of the vise when the drill rod is buckled; a vise base, which is installed at the bottom of the vise and is slidably arranged on the drill rig along the extension direction of the drill rig; a movable reset mechanism, which is arranged in the grooves on both sides of the vise, and is used to keep the vise base reset to the position between the grooves on both sides when the drill rod is buckled or unbuckled. When the present invention is working, the front and rear floating of the vise can solve the problem of axial force on the drill rod or threaded joint when the single power head floats, and can reduce the impact on the structure and increase the life of the drill rod or threaded joint.

Description

Technical Field

[0001] The invention relates to the technical field of power head vise construction protection, in particular to a power head and vise double floating mechanism and a horizontal directional drilling rig. Background Art

[0002] With the extensive research and advancement of pipeline laying projects both domestically and internationally, horizontal directional drilling rigs have gained widespread application. During directional drilling or pullback, the power head of a horizontal directional drilling rig must repeatedly make and break out the drill pipe. During this process, the thread travel caused by the loosening and tightening of the threads can cause the drill pipe and its connected threaded joints to move axially along the drill rig.

[0003] To address this issue, traditional drill rigs incorporate a floating power head to protect structural components from the additional stress caused by axial displacement due to thread loosening. However, relying solely on power head floating isn't suitable for all situations involving loose or loose threads in drill pipes or threaded joints, and can still easily cause abnormal wear of the drill pipe threads, shortening the drill pipe's service life or damaging other structural components. Summary of the Invention

[0004] The purpose of the present invention is to provide a dual floating mechanism of a power head and a vise and a horizontal directional drilling rig to solve the technical problem proposed in the above background technology that relying solely on the floating of the power head cannot be applicable to all drill rods or threaded joints with loose threads, and is still prone to abnormal wear of the drill rod threads.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a dual-floating mechanism of a power head and a vise, comprising:

[0007] A drill stand, on which a vise and a power head are relatively arranged, wherein the vise is used to clamp the drill rod, and the power head is used to make or break the drill rod clamped by the vise through a threaded joint;

[0008] The rotating box is slidably arranged in the guide groove on the power head along the extension direction of the drill frame, and is used to slide a first floating distance toward one side of the vise when the drill rod is screwed on; the first floating distance is equal to the thread stroke of the drill rod when the thread is screwed on;

[0009] A vise base is mounted on the bottom of the vise and is slidably disposed on the drill frame along the axis of the drill frame; and is used to move a second floating distance away from the rotating box when the drill rod is shattered, wherein the second floating distance is equal to the thread stroke of the drill rod when the thread is loosened and shattered;

[0010] The movable reset mechanism is arranged in the grooves on both sides of the vise on the drill stand, and is used to keep the vise base reset to the position between the grooves on both sides when the drill rod is buckled or unbuckled.

[0011] Optionally, the mobile reset mechanism includes:

[0012] a moving block, disposed in the groove;

[0013] a spring, provided between the moving block and the bottom wall of the groove, for maintaining the tendency of the moving block to extend out of the groove;

[0014] A first mating surface is formed on the top of the moving block, and the first mating surface is used to abut against and cooperate with a second mating surface on the vise base when the vise base moves, so that the moving block is pressed into the groove and compresses the spring.

[0015] Optionally, both the first mating surface and the second mating surface are inclined surfaces.

[0016] Optionally, a third mating surface is further formed on the top of the moving block, and a sharp corner is formed at the junction of the third mating surface and the first mating surface, and a reset roller is provided at the sharp corner.

[0017] Optionally, it also includes:

[0018] The guide shaft is arranged in the guide groove, and the bottom of the rotating box body is passed through the guide shaft and slides in the guide groove along the guide shaft.

[0019] Optionally, it also includes:

[0020] The vise guide groove is arranged between the grooves on both sides of the vise and is slidably matched with a guide block arranged at the bottom of the vise base.

[0021] Optionally, it also includes:

[0022] The vise limiting mechanism is provided on both sides of the vise and located outside the movable reset mechanism; the vise limiting mechanism includes a flat plate fixed perpendicular to the drill frame, and the flat plate is used to form a mechanical limit for the vise moving along the axis of the drill frame; the back of the flat plate is also provided with ribs.

[0023] Optionally, a power head roller is provided at the bottom of the power head.

[0024] Optionally, the vise includes a front vise body and a rear vise body that are separately arranged; the rear vise body is located on the side close to the power head; the rear vise body includes a built-in rotating body, which can hold the drill rod and rotate in the rear vise body; the rotation axis of the rotating body is the same as the extension direction of the drill rod.

[0025] In a second aspect, the present invention further provides a horizontal directional drilling rig comprising the power head and the vise double floating mechanism. Compared to the prior art, the present invention has the following beneficial effects:

[0026] 1. The rotating box and vise base in the present invention can float during the process of making and breaking the thread respectively to offset the thread stroke during the process of making or breaking the thread, so as to solve the problem of axial force on the drill pipe or threaded joint when the single power head floats, reduce the impact on the structure and increase the life of the drill pipe or threaded joint.

[0027] 2. When the present invention is in use, the torque required for tightening the threads during the make-up process is relatively stable and does not require a large torque. The present invention adopts a rotating box body floating during the make-up process, and the floating resistance is small. The resistance to the thread tightening process is also small, and the thread tightening process is relatively stable.

[0028] 3. When the present invention is in use, since the drill rod rotates in the direction of the tightening thread during operation, it will be screwed very tightly. In the initial stage of shattering, a large torque is required to loosen the thread. During the shattering process, the present invention adopts a rotating box to stop the vise from overcoming the resistance of the mobile reset mechanism to float. This can not only offset the thread stroke of the loose thread, but also effectively avoid the instability of the vise or the rotating box caused by high torque shattering. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of a double floating mechanism of a power head and a vise according to the present invention;

[0030] Figure 2 for Figure 1 Sectional views along the viewing plane;

[0031] Figure 3 This is a schematic diagram of the vise when it moves to the front end.

[0032] Reference numerals in the figure: drill stand 1, vise 4, power head 2, rotating box 21, guide shaft 22, power head roller 23, vise rear limit 31, vise front limit 32, front vise body 41, rear vise body 42, movable reset mechanism 5, movable block 51, spring 52, vise guide groove 6, first mating surface 511, second mating surface 512, reset roller 513, third mating surface 514, groove 7. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Example

[0034] from Figure 1-3This embodiment provides a dual-floating mechanism for a power head and a vise. The mechanism includes a drill rig 1, a vise 4, and a power head 2 positioned relative to each other on the drill rig 1. The vise 4 is used to clamp a drill rod, and the power head 2 is used to make or break the vise-clamped drill rod through a threaded joint. Makeup and breakout involve tightening threads to secure or loosening threads to remove the vise-clamped drill rod from another drill rod.

[0035] The double floating mechanism in this embodiment also includes a rotating box 21, which is slidably arranged in the guide groove on the power head 2 along the axial direction of the drill rig 1, and is used to slide a first floating distance toward the vise side when the drill rod is fastened; the first floating distance is used to correspond to the thread stroke when the drill rod is tightly threaded.

[0036] A guide shaft 22 is provided in the guide groove, and the bottom of the rotating box 21 is passed through the guide shaft 22 and slides in the guide groove along the guide shaft 22. The sliding structure of the rotating box 21 in the guide groove can also be a sliding matching structure such as a V-shaped and square groove type, a slide plate, etc.

[0037] A vise base is also installed at the bottom of the vise 4; the vise base is slidably arranged on the drill rig 1 along the axial direction of the drill rig 1; it is used to move a second floating distance in the direction away from the rotating box 21 when the drill rod is shaved, and the second floating distance is used to correspond to the thread stroke when the drill rod is loosened and shaved; a guide block is provided at the bottom of the vise base, and the guide block slides with the vise guide groove 6 between the two grooves 7 on the drill rig 1.

[0038] A movable reset mechanism 5 is provided in the grooves 7 on both sides of the vise 4 on the drill stand 1. The movable reset mechanism 5 is used to keep the vise base reset to the position between the grooves 7 on both sides when the drill rod is buckled or unbuckled.

[0039] Specifically, during the make-up process, the threaded joint is rotated forward to tighten the thread (the vise 4 clamps the drill pipe, and the power head is rotated forward to tighten), and a pulling force is generated between the threaded joints of the vise 4 and the power head 2 to move closer to each other. During this process, due to the resistance given by the moving reset mechanism 5 on both sides of the vise 4, and the resistance of the rotating box 21 sliding in the guide groove is relatively small, the rotating box 21 will be more easily pulled by the pulling force and move toward the side of the vise 4 in the guide groove, so that the distance between the power head 2 and the vise 4 can be reduced with the thread stroke to reduce the impact of the structure. During the entire make-up process, under normal conditions, only the movement of the threaded joint by the rotating box 21 is required to offset the thread stroke, and the vise 4 remains stationary, thereby effectively avoiding the instability of the thread tightening process caused by the simultaneous floating of the power head 2 and the vise 4.

[0040] Furthermore, during the unthreading process, the threaded joint is reversed to loosen the threads (the vise 4 clamps the drill pipe, and the power head reverses to unthread), and a thrust is generated between the threaded joints of the vise and the power head, which push them away from each other. During this process, the rotating box 21 is located at the end of the guide groove on the side away from the vise and is locked, so that there is sufficient space between the threaded joint and the vise. During the unthreading process, due to the locking of the rotating box 21, the vise will move toward the side away from the threaded joint under the thrust, and during this process, the movable reset mechanism 5 will continue to give the vise a reverse thrust to make the vise more stable during the movement process. After the unthreading is completed, the movable reset mechanism 5 can drive the vise to reset for the next make-up or unthreading operation.

[0041] Due to the large mass of the power head, the tension generated by tightening the thread during the make-up process and the thrust generated by loosening the thread during the breakout process are not enough to drive the power head to move, and the power head will remain stationary.

[0042] In this embodiment, the movable reset mechanism 5 includes: a movable block 51 provided in the groove 7, and a spring 52 provided between the movable block 51 and the bottom wall of the groove 7, the spring 52 being used to maintain the tendency of the movable block 51 to extend out of the groove 7;

[0043] A first mating surface 511 is formed on the top of the moving block 51 , and the first mating surface 511 is used to abut against a second mating surface 512 at the vise base when the vise base moves, so that the moving block 51 is pressed into the groove 7 and compresses the spring 52 .

[0044] Specifically, when the vise base is pushed, the second mating surface 512 of the vise base abuts the first mating surface 511 of the movable block 51, thereby achieving the transition between the first movement of the vise along the axis of the drill rig 1 and the movement of the movable block 51 along the depth of the groove 7. Furthermore, the spring 52 exerts an upward force on the movable block 51, thereby enabling the movable block 51 to exert a certain reverse thrust on the vise base.

[0045] In this embodiment, the first mating surface 511 and the second mating surface 512 are both inclined surfaces. A third mating surface is also formed on the top of the moving block 51. The intersection of the third mating surface and the first mating surface 511 forms a sharp corner, and a reset roller 513 is provided at the sharp corner.

[0046] This embodiment can stably achieve relative movement between the moving block 51 and the vise base through the matching of the inclined surfaces.

[0047] The vise limit mechanism is provided on both sides of the vise 4 and outside the movable reset mechanism 5; it includes a vise rear limit 31 and a vise front limit 32;

[0048] The vise limiting mechanism includes a flat plate fixed perpendicular to the drill frame 1, which is used to mechanically limit the vise moving along the axis of the drill frame 1 to prevent the vise from detaching from the drill frame 1; ribs are also provided on the back of the flat plate to improve the stability of the flat plate.

[0049] In this embodiment, a power head roller 23 is provided at the bottom of the power head for moving the power head along the axis of the drill frame 1. During actual construction, the drill frame is generally tilted 15 degrees ( Figure 1 The power head is subject to a large friction force, and the component force of the power head's own gravity along the axis of the drill rig cannot overcome the friction force. Therefore, the tension generated by the tightening thread and the thrust generated by the loosening thread cannot push the power head. In the absence of manual intervention, the power head can always remain stable. Example

[0050] Similar to Example 1, further, in a dual-floating mechanism of a power head and a vise provided in this embodiment, the vise 4 includes a front vise body 41 and a rear vise body 42 which are separately arranged; the rear vise body is located on the side close to the power head; the rear vise body 42 includes a rotating body, and the rotating body is placed in the rear vise body 42 without affecting the normal floating of the rear vise body 42. The rotating body can hold the drill rod and rotate in the rear vise body 42; at the same time, the rotation axis of the rotating body is the same as the extension direction of the drill rod.

[0051] During construction, the drill rods will continue to rotate in the direction of tightening, resulting in the torque provided by the power head 2 sometimes being insufficient to separate the two drill rods during unbundling. In this case, the vise 4 is required to provide high torque to assist in unbundling, and the power head 2 can then separate the drill rods. Under normal conditions, the front vise body 41 and the rear vise body 42 will jointly clamp the same drill rod, while the power head 2 clamps the other drill rod. However, in this situation where the vise needs to provide high torque to assist in unbundling, the front vise body 41 and the rear vise body 42 clamp the two drill rods separately. Specifically, when the two drill rods begin to unbundle, the front vise body 41 clamps one drill rod, while the rotating body of the rear vise body 42 and the threaded joint of the power head 2 clamp the other drill rod. The rotating body and the threaded joint of the power head 2 then rotate simultaneously to loosen the threaded connection between the two drill rods, thus assisting in unbundling. Once the threaded connection between the two drill rods is loosened, the rotating body releases its grip on the drill rods and resets. Unbundling can then be completed by the torque generated by the rotation of the power head 2. Example

[0052] This embodiment provides a horizontal directional drilling rig, which includes the power head and vise double floating mechanism described in Example 1 or Example 2.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A dual floating mechanism of a power head and a vise, characterized by: include: A drill stand (1), wherein a vise (4) and a power head (2) are arranged relative to each other on the drill stand (1), the vise (4) is used to clamp a drill rod, and the power head (2) is used to make or break the drill rod clamped by the vise (4) through a threaded joint; The rotating box (21) is slidably arranged in the guide groove on the power head (2) along the extension direction of the drill frame (1), and is used to slide a first floating distance toward one side of the vise when the drill rod is fastened; the first floating distance is equal to the thread stroke of the drill rod when the thread is fastened; A vise base is mounted on the bottom of the vise (4) and is slidably arranged on the drill frame (1) along the axis of the drill frame (1); and is used to move a second floating distance in a direction away from the rotating box (21) when the drill rod is shaved, wherein the second floating distance is equal to the thread stroke when the drill rod is loosened and shaved; A movable reset mechanism (5) is provided in the grooves (7) on both sides of the vise (4) on the drill stand (1), and is used to keep the vise base in a tendency to reset to a position between the grooves (7) on both sides when the drill rod is buckled or unbuckled; The mobile reset mechanism (5) comprises: A moving block (51) is disposed in the groove (7); a spring (52) disposed between the moving block (51) and the bottom wall of the groove (7) and used to maintain the tendency of the moving block (51) to extend out of the groove (7); A first mating surface (511) is formed on the top of the moving block (51), and the first mating surface (511) is used to abut against a second mating surface (512) at the base of the vise (4) when the base of the vise (4) moves, so that the moving block (51) is pressed into the groove (7) and compresses the spring (52).

2. The double floating mechanism of the power head and the vise according to claim 1, characterized in that: The first mating surface (511) and the second mating surface (512) are both inclined surfaces.

3. The dual floating mechanism of the power head and the vise according to claim 2, characterized in that: A third mating surface (514) is also formed on the top of the moving block (51), and a sharp corner is formed at the junction of the third mating surface (514) and the first mating surface (511), and a reset roller (513) is provided at the sharp corner.

4. The dual floating mechanism of the power head and the vise according to claim 1, characterized in that: Also includes: The guide shaft (22) is arranged in the guide groove, and the bottom of the rotating box (21) is passed through the guide shaft (22) and slides in the guide groove along the guide shaft (22).

5. The dual floating mechanism of the power head and the vise according to claim 1, characterized in that: Also includes: The vise guide groove (6) is provided between the grooves (7) on both sides of the vise (4) and is slidably engaged with a guide block provided at the bottom of the vise base.

6. The dual floating mechanism of the power head and the vise according to claim 1, characterized in that: Also includes: A vise limiting mechanism is provided on both sides of the vise (4) and outside the movable reset mechanism (5); the vise limiting mechanism comprises a flat plate fixed perpendicular to the drill frame (1), the flat plate being used to mechanically limit the vise moving along the axis of the drill frame (1); and ribs are also provided on the back of the flat plate.

7. The dual floating mechanism of the power head and the vise according to claim 1, characterized in that: A power head roller (23) is provided at the bottom of the power head.

8. The dual floating mechanism of the power head and the vise according to claim 1, characterized in that: The vise (4) comprises a front vise body (41) and a rear vise body (42) which are separately arranged; the rear vise body is located on a side close to the power head; the rear vise body (42) comprises a built-in rotating body, which can hold the drill rod tightly and rotate within the rear vise body (42); the rotation axis of the rotating body is in the same direction as the extension direction of the drill rod.

9. A horizontal directional drilling rig, characterized in that: The utility model comprises the power head and the vise double floating mechanism as described in any one of claims 1 to 8.

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