Dual gripper synchronous booster system

Abstract

The present invention relates to the technical field of drill pipe clamping, and discloses a dual-clamp synchronous boosting system, including a clamping cylinder control oil circuit and a boosting oil circuit, wherein the clamping cylinder control oil circuit includes a front clamping cylinder control oil circuit and a rear clamping cylinder control oil circuit, wherein the front clamping cylinder control oil circuit and the rear clamping cylinder control oil circuit both include a rod chamber oil circuit connected to the rod chamber of the clamping cylinder and a rodless chamber oil circuit connected to the rodless chamber of the clamping cylinder, and the boosting oil circuit is connected to the rodless chamber oil circuit; when the rodless chamber oil circuit is supplied with oil or the supply of oil is completed, the rodless chamber is supplied with oil through the boosting oil circuit. Through the independently arranged boosting oil circuit, when the rodless chamber is supplied with oil or after the supply of oil to the rodless chamber is completed, oil is supplied to the rodless chamber, thereby increasing the oil pressure of the rodless chamber, compensating for the clamping force reduced by the leakage of the clamping cylinder, and solving the problem of the clamping cylinder slipping when the clamping force is insufficient.

Description

Technical Field

[0001] The invention relates to the technical field of drill rod clamping, and in particular to a double-clamp synchronous pressurizing system. Background Art

[0002] The top double clamp is a common clamp type used in mining drilling rigs. It uses clamping cylinders symmetrically arranged on both sides to clamp the drill rod. The clamping cylinder includes a rodless chamber and a rod chamber. When oil is fed into the rodless chamber, the output shaft of the clamping cylinder extends to clamp the drill rod. When oil is fed into the rod chamber, the output shaft of the clamping cylinder retracts to release the clamping of the drill rod. It has the advantages of simple structure, reliable clamping and easy maintenance. At the same time, the setting of the front and rear double clamps can complete the relative rotation of the drill rod in the hole and the drill rod to be disassembled, as well as the swinging to release the jam. However, the existing top double clamps also generally have the phenomenon of occasional slippage, especially when the drilling rig is unbuckling.

[0003] When the drill pipe is connected, the drill pipe threaded joint is only subject to very small resistance, and the power head only needs to provide a very small rotational torque to complete the connection. Therefore, the clamp only needs to provide a very small clamping force to ensure that the drill pipe it clamps does not slip during the connection.

[0004] When the drill pipe is unhooked, the torque of fully tightening the thread must be overcome. The torque of fully tightening the thread is much greater than the torque after the connection after drilling and twisting at the bottom of the hole. The drilling rig needs to provide a large reverse torque to complete the unhooking. Correspondingly, the clamp also needs to provide a large and stable clamping force. In the unhooking process of the double clamp, there are generally two situations: the front clamp and the rear clamp rotate relative to each other, and the power head and the rear clamp rotate relative to each other. Therefore, both the front clamp and the rear clamp need to have a stable clamping force at the appropriate time to ensure that the drill pipe they clamp do not slip when unhooking.

[0005] The above-mentioned slippage is generally caused by defects in the hydraulic system. Analysis of the existing double-clamp hydraulic system shows that the reasons for the slippage of the shackle are as follows: the clamping cylinder clamps the drill pipe under the action of hydraulic pressure and maintains pressure through the hydraulic lock, and then uses the power head motor to reverse the shackle. However, both the hydraulic lock and the clamping cylinder will have different degrees of leakage. As the use time increases, the leakage amount and speed will gradually increase. Therefore, the clamping force will decrease during the process from clamping to reverse shackle, causing the clamp to slip when unloading the drill, and ultimately leading to shackle failure, seriously affecting construction efficiency and site safety. Summary of the invention

[0006] The present invention is intended to provide a dual-gripper synchronous pressurizing system to solve the problem of slippage caused by a decrease in clamping force due to leakage in the existing dual-gripper hydraulic system during the period between clamping and shackle.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a dual-clamp synchronous booster system, including a clamping cylinder control oil circuit and a booster oil circuit, the clamping cylinder control oil circuit includes the front clamper clamping cylinder control oil circuit and the rear clamper clamping cylinder control oil circuit, the front clamper clamping cylinder control oil circuit and the rear clamper clamping cylinder control oil circuit both include a rod chamber oil circuit connected to the rod chamber of the clamping cylinder and a rodless chamber oil circuit connected to the rodless chamber of the clamping cylinder, the booster oil circuit is connected to the rodless chamber oil circuit; when the rodless chamber oil circuit is filled with oil or when the oil filling stops, the rodless chamber is filled with oil through the booster oil circuit.

[0008] The beneficial effects of this solution are: 1. Through the independently arranged booster oil circuit, when the rodless chamber is supplied with oil, the rodless chamber is also supplied with oil at the same time, thereby avoiding problems such as insufficient clamping force due to leakage of the clamping cylinder, and avoiding the existing hydraulic system of the top double clamper from slipping due to a decrease in clamping force due to leakage during the time between clamping and shackle, thereby improving the efficiency of shackle; 2. After the rodless chamber is supplied with oil, the booster oil circuit is used to supply oil to the rodless chamber again to increase the oil pressure in the rodless chamber, thereby compensating for the reduced clamping force due to leakage of the clamping cylinder, and solving the problem of slipping of the clamping cylinder when the clamping force is insufficient.

[0009] Furthermore, the front clamper clamping cylinder control oil circuit and the rear clamper clamping cylinder control oil circuit both include hydraulic locks, the upper ends of the hydraulic locks are respectively connected to the rod chamber and rodless chamber of the front clamper clamping cylinder and the rear clamper clamping cylinder, and the connecting point between the boosting oil circuit and the rodless chamber oil circuit is set between the hydraulic lock and the rodless chamber of the clamping cylinder.

[0010] Beneficial effect: by setting the connection position between the boost oil circuit and the rodless chamber oil circuit after the hydraulic lock, the self-locking performance of the hydraulic lock can be used to maintain the oil pressure of the pressure oil in the rodless chamber, reducing the need for additional valve body settings.

[0011] Furthermore, a one-way valve is provided between the boost oil circuit and the rodless chamber oil circuit.

[0012] Beneficial effect: Through the setting of the one-way valve, the pressure oil can only flow from the boost oil circuit to the rodless chamber. With the cooperation of the hydraulic lock, the pressure oil flowing into the boost oil circuit all stays in the space of the rodless chamber, the rodless chamber oil circuit, the hydraulic lock and the one-way valve combination, maintaining the hydraulic pressure of the rodless chamber, and then maintaining the clamping force of the clamping cylinder, thereby avoiding insufficient clamping force caused by hydraulic leakage, and then avoiding the problem of slipping of the clamp, thereby improving work efficiency.

[0013] Furthermore, the front clamper clamping cylinder control oil circuit and the rear clamper clamping cylinder control oil circuit are connected in parallel.

[0014] Beneficial effect: By connecting the front clamper clamping cylinder control oil circuit and the rear clamper clamping cylinder control oil circuit in parallel, the front clamper clamping cylinder control oil circuit and the rear clamper clamping cylinder control oil circuit can be pressurized at the same time as needed, so that the front clamper and the rear clamper clamp the drill rod together, further reducing the slippage of the drill rod shackle.

[0015] Furthermore, it also includes a power head steering control oil circuit, which includes tube A and tube B. When the pressure oil flows from tube A to tube B, the power head drills forward, and when the pressure oil flows from tube B to tube A, the power head reverses and unhooks; the front clamper clamping cylinder control oil circuit includes tube A1, which is connected to the rod cavity through a hydraulic lock to form the front clamper rod cavity oil circuit; the rear clamper clamping cylinder control oil circuit includes tube A2, which is connected to the rear clamper rod cavity through a hydraulic lock to form the rear clamper rod cavity oil circuit; before tube A is filled with oil, tubes A1 and A2 are filled with oil in advance.

[0016] Beneficial effect: The steering control oil circuit of the power head is linked with the clamping cylinder control oil circuit. When the power head is drilling in the forward direction, the clamping cylinder contracts to avoid the clamping cylinder interfering with the drilling work of the power head and the drill rod, reducing the wear of the drill rod and reducing the cost of use.

[0017] Furthermore, the front clamper clamping cylinder control oil circuit also includes a B1 tube, which is connected to the rodless cavity through a hydraulic lock to form a front clamper rodless cavity oil circuit; the rear clamper clamping cylinder also includes a B2 tube, which is connected to the rodless cavity of the rear clamper clamping cylinder through a hydraulic lock to form a rear clamper rodless cavity oil circuit; when the hydraulic lock maintains pressure in the rodless cavity, oil is fed into the booster oil circuit.

[0018] Furthermore, the boost oil circuit includes a P1 boost oil circuit and a P2 boost oil circuit, and the P1 boost oil circuit and the P2 boost oil circuit supply oil at the same time.

[0019] Furthermore, it also includes a reversing valve, which is arranged between the P1 boosting oil circuit and the P2 boosting oil circuit and the front clamper rodless chamber oil circuit and the rear clamper rodless chamber oil circuit.

[0020] Beneficial effect: The P1 boost oil circuit and the P2 boost oil circuit are merged through the reversing valve, and the merged boost oil is added to the front clamp rodless chamber oil circuit and the rear clamp rodless chamber oil circuit, so that the higher pressure boost oil between the P1 boost oil circuit and the P2 boost oil circuit is connected to the front clamp rodless chamber oil circuit and the rear clamp rodless chamber oil circuit.

[0021] Furthermore, a one-way valve is also provided between the reversing valve and the front clamper rodless chamber oil circuit and the rear clamper rodless chamber oil circuit.

[0022] Furthermore, the reversing valve is a solenoid valve.

[0023] Beneficial effect: The clamping oil circuit of the clamping cylinder is opened through the electromagnetic reversing valve when the reverse shackle is used, and a one-way valve is arranged before and after the electromagnetic reversing valve to form a valve bridge that can automatically select the high-pressure boosting oil circuit. The cut-off effect of the one-way valve is utilized to ensure the reliable operation of the clamp and the safety of the components during the clamping operation and boosting. This solves the problem of slipping caused by the decrease of clamping force due to leakage of the clamping cylinder and the hydraulic lock in the existing hydraulic system of the top double clamp, thereby ensuring the safety of on-site construction and improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a connection diagram of an embodiment of the present invention;

[0025] Figure 2 This is a three-dimensional diagram of a double clamp of Example 2 of the present invention;

[0026] Figure 3 This is a cross-sectional view of a double clamper according to Embodiment 2 of the present invention;

[0027] Figure 4 A three-dimensional diagram of the double-holder slips of Example 2 of the present invention;

[0028] Figure 5 This is a schematic diagram of an inner guide sleeve of Embodiment 2 of the present invention;

[0029] Figure 6 This is a three-dimensional diagram of the outer guide sleeve of Example 2 of the present invention. DETAILED DESCRIPTION

[0030] The following is further described in detail through specific implementation methods:

[0031] The figure marks in the drawings of the specification include: power head motor 1, front clamper clamping cylinder 2, front clamper hydraulic lock 21, outer cava 221, rectangular plane 2211, block 2212, inner cava 222, boss 2221, inner guide sleeve 231, accommodating chamber 2311, outer guide sleeve 232, small diameter section 2301, large diameter section 2302, mounting plate 241, support plate 242, reinforcement plate 243, pin 25, swing cylinder 26, rear clamper clamping cylinder 3, rear clamper hydraulic lock 31, reversing valve 41, first one-way valve 411, second one-way valve 412, third one-way valve 413, fourth one-way valve 414.

[0032] Example 1

[0033] Embodiment 1 is basically as attached Figure 1 As shown, Figure 1The dual-clamp synchronous booster system shown is used to control a drilling rig including a power head, a front clamp and a rear clamp, and includes a power head steering control oil circuit, a clamping cylinder control oil circuit and a booster oil circuit. The power head steering control oil circuit, the clamping cylinder control oil circuit and the booster oil circuit are independent of each other. The power head steering control oil circuit includes a drilling direction control oil circuit. The power head includes a power head motor 1 and an active drill rod. The power head motor 1 is connected to the active drill rod. The power head motor 1 is a hydraulic motor. The drilling direction control oil circuit includes an A pipe and a B pipe. The A pipe and the B pipe are connected with pressure oil. The pressure oil is connected to the power head motor 1 through the A pipe and the B pipe. When the pressure oil enters the power head from the A pipe and returns oil through the B pipe, the power head motor 1 rotates forward. When the pressure oil enters the power head from the B pipe and returns oil to the A pipe, the power head motor 1 rotates reversely.

[0034] like Figure 1 As shown, the clamping cylinder control oil circuit includes a front clamper clamping cylinder control oil circuit and a rear clamper clamping cylinder control oil circuit, the front clamper clamping cylinder control oil circuit and the rear clamper clamping cylinder control oil circuit are arranged in parallel, the front clamper includes a front clamper clamping cylinder 2, the rear clamper includes a rear clamper clamping cylinder 3, the front clamper clamping cylinder 2 and the rear clamper clamping cylinder 3 both include a cylinder body and a piston rod, the piston rod is slidably arranged in the cylinder body and divides the cylinder body into a rod chamber and a rodless chamber, the rear clamper hydraulic lock 31 is connected with the rod chamber and the rodless chamber of the rear clamper clamping cylinder 3, when oil enters the rodless chamber, the front clamper and the rear clamper both maintain a clamping state, and when oil enters the rod chamber, the clamping state is released.

[0035] The front clamper clamping cylinder control oil circuit includes A1 pipe, B1 pipe and front clamper hydraulic lock 21. The lower ends of A1 pipe and B1 pipe are connected with hydraulic oil respectively, and the upper ends are connected with the lower end of the front clamper hydraulic lock 21. The upper end of the front clamper hydraulic lock 21 is connected with the rod chamber and the rodless chamber of the front clamper clamping cylinder 2, so that A1 pipe is connected with the rod chamber of the front clamping cylinder, and B1 pipe is connected with the rodless chamber of the front clamping cylinder, so that the front clamper hydraulic lock 21 is connected to the rod chamber of the front clamping cylinder. The front clamper clamping cylinder maintains pressure to form a front clamper rod chamber oil circuit and a front clamper rodless chamber oil circuit respectively; the rear clamper clamping cylinder control oil circuit is basically the same as the front clamper clamping cylinder control oil circuit, and the rear clamper clamping cylinder control oil circuit includes A2 pipe, B2 pipe and rear clamper hydraulic lock 31, A2 pipe is connected with the rear clamper rod chamber, and B2 pipe is connected with the rodless chamber of the rear clamping cylinder; before A pipe is filled with oil, A1 pipe and A2 pipe are filled with oil in advance.

[0036] The front clamper clamping cylinder control oil circuit and the rear clamper clamping cylinder control oil circuit both include a rod chamber oil circuit connected to the rod chamber of the clamping cylinder and a rodless chamber oil circuit connected to the rodless chamber of the clamping cylinder.

[0037] The boost oil circuit includes a reversing valve 41, a P1 boost oil circuit and a P2 boost oil circuit. The reversing valve 41 is an electromagnetic type. Figure 1 As shown, two oil pipes are connected to the upper end of the reversing valve 41, and the two oil pipes are respectively connected to the rodless chambers of the front clamping cylinder and the rear clamping cylinder, and the two oil pipes are respectively connected to the first one-way valve 411 and the second one-way valve 412, and the lower end of the reversing valve 41 is connected to the P1 boosting oil circuit and the P2 boosting oil circuit, and a third one-way valve 413 is connected between the P1 boosting oil circuit and the reversing valve 41, and a fourth one-way valve 414 is connected between the P2 boosting oil circuit and the reversing valve 41. When the hydraulic lock maintains pressure in the rodless chamber, oil is supplied to the P1 boosting oil circuit and the P2 boosting oil circuit.

[0038] The specific implementation process is as follows:

[0039] According to the working principle of the drilling rig, when the power head motor 1 rotates forward, the front clamp and the rear clamp must be released at the same time, that is, before the power head rotates forward, the pressure oil must be passed through the A1 pipe and the A2 pipe to the rod chamber of the front clamp clamping cylinder 2 and the rear clamp clamping cylinder 3, so that the piston rod retracts, and the front clamp and the rear clamp are both in a released state without affecting the rotation of the drill rod. At this time, oil is passed to the A pipe of the power head motor 1 to start the forward rotation. At this time, the A pipe of the power head motor 1 is inlet, and the B pipe is outlet. The electromagnetic reversing valve 41 is always in the right position. During the forward rotation of the power head, the hydraulic lock keeps the pressure on the rod chamber of the clamping cylinder to ensure that the clamp is released.

[0040] Theoretically, both the hydraulic lock and the clamping cylinder may leak. However, since the stroke of the clamping cylinder is long enough, in the released state, even if the piston rod moves slightly toward the rod chamber due to leakage of the hydraulic lock or the clamping cylinder, thereby reducing the rod chamber of the clamping cylinder, the stroke of the clamping cylinder is long enough. The slight movement will not cause the clamping cylinder to change from a released state to a clamped state. Therefore, in the released state, leakage will not cause the clamp to change from a released state to a clamped state. In the clamped state, a slight movement of the piston rod will reduce the clamping force, causing the drill pipe clamp to slip.

[0041] When the drilling rig is in a working condition such as reverse shackle, it is necessary to pressurize the front clamp and the rear clamp at the same time, and ensure the clamping force is stable and reliable through the joint clamping action of the front clamp and the rear clamp.

[0042] Before unbuckling, according to the drilling rig structure and work flow, first, oil is passed to the rodless chamber of the clamping cylinder 2 of the front clamp through B1, and oil is passed to the rodless chamber of the clamping cylinder 3 of the rear clamp through B2, so that the clamping cylinders of the front clamp and the rear clamp clamp the drill pipe, and then the pressure is maintained by the hydraulic lock, and then oil is passed to the power head motor 1 through the B pipe to drive the output shaft of the power head motor 1 to reverse. Before the output shaft reverses, the electromagnetic reversing valve 41 is controlled to switch to the left position, and the P1 boosting oil circuit and the P2 boosting oil circuit are supplied with oil at the same time. Due to the interconnection of the pipelines, the pressure oil in the high-pressure oil circuits of the P1 boosting oil circuit and the P2 boosting oil circuit will enter the rodless chambers of the front clamping oil cylinder and the rear clamping oil cylinder through the electromagnetic reversing valve 41 and the first and second check valves 411 and 412 thereafter, thereby simultaneously pressurizing the clamping cylinders of the front clamp and the rear clamp to supplement the clamping force loss caused by leakage. In addition, the P1 boost oil circuit and the P2 boost oil circuit supply oil at the same time, the pipelines are connected and there is a pressure difference, but due to the reverse cut-off effect of the third one-way valve 413 and the fourth one-way valve 414, the high-pressure oil will not flow back into the low-pressure oil circuit, causing adverse effects thereon.

[0043] Example 2

[0044] On the basis of Example 1, Example 2 makes certain improvements to the existing double clamp. The existing double clamp can refer to the application number: 201710280043.3, which discloses a new type of piston-to-top double clamp, including a base, a swing cylinder 26, a swing body, a front clamp clamping cylinder 2 and a rear clamp clamping cylinder 3. The swing body is hingedly mounted on one side of the base, the front clamp clamping cylinder 2 is fixedly mounted on the swing body, and the rear clamp clamping cylinder 3 is mounted on the other side of the base. The center of the front clamp clamping cylinder 2 is aligned with the center of the rear clamp clamping cylinder 3. The swing cylinder is hingedly mounted on the swing cylinder ear seat, and the telescopic end of the swing cylinder is connected to the swing body. The swing cylinder can drive the swing body to swing when it is telescoped.

[0045] The double clamp of this embodiment is substantially the same as the above, except that Figure 2-Figure 6 As shown, Figure 2 As shown, the base includes a mounting plate 241, which is detachably connected to the frame, preferably bolted, and the mounting plate 241 is fixedly provided with a front clamp mounting position and a front clamp mounting portion, and the front clamp mounting portion includes two sets of support plates 242 and a reinforcing plate 243, and the support plate 242 is welded, and a through hole for the drill rod to pass through is provided on the support plate 242, and an opening is provided at the top of the through hole, so that the top of the through hole is open, and the width of the opening is greater than the diameter of the motor at the bottom of the hole. A flip plate is welded to the side wall of the support plate 242, and a flip hole is provided on the flip plate, and a pin 25 is provided between the flip hole and the swing body.

[0046] Furthermore, in order to ensure the drilling angle of the drill rod during the drilling operation of the drilling rig and to adapt to the drill rods of two rod diameters, a guide sleeve assembly is added to the swing body, such as Figure 2 , Figure 3 As shown, the guide sleeve assembly includes Figure 5 The inner guide sleeve 231 shown and Figure 6 The outer diameters of the outer guide sleeve 232, the inner guide sleeve 231 and the outer guide sleeve 232 are divided into two stages: a small diameter section 2301 and a large diameter section 2302. Figure 5 As shown, the large diameter section 2302 of the inner guide sleeve 231 is provided with a receiving cavity 2311, the outer diameter of the receiving cavity 2311 is adapted to the outer diameter of the large diameter section 2302 of the outer guide sleeve 232, and the inner guide sleeve 231 and the outer guide sleeve 232 are both detachably connected to the swing body, specifically, the inner guide sleeve 231 and the outer guide sleeve 232 are both connected to the swing body by bolts, such as Figure 3 As shown, when the inner guide sleeve 231 and the outer guide sleeve 232 are assembled, the small diameter section 2301 of the outer guide sleeve 232 can be sleeved in the small diameter section 2301 of the inner guide sleeve 231, and at the same time, the large diameter section 2302 of the outer guide sleeve 232 is located in the accommodating cavity 2311; the guide sleeve assembly and the pin shaft 25 are installed selectively.

[0047] Generally speaking, the length and outer diameter of the bottom hole motor, the core drilling tool of directional drilling, are much larger than ordinary drill pipes, and a power head is set at the rear end of the drilling axis of the drilling rig. The distance between the power head and the clamp for installing and removing the drill pipe is limited, so the bottom hole motor cannot be installed and removed from the rear end or middle of the frame, which is common for drilling rigs. The bottom hole motor can only be installed from the clamp, that is, the front end of the frame, that is, the bottom hole motor is inserted into the clamp from the front end of the frame. However, in a narrow construction environment, the bottom hole motor cannot be installed from the front end of the clamp. There are generally two solutions at the current construction site: the first is to tilt the bottom hole motor at a certain angle relative to the inner hole axis of the clamp (i.e., the drilling axis) and insert it into the clamp, but the scope of application of this method is very limited. When the distance between the clamp and the hole wall is small to a certain extent or the bottom hole motor is too long, the overly tilted bottom hole motor will not be able to align with the inner hole of the clamp. At this time, the frame needs to be tilted as a whole to change the up and down inclination angle of the frame, so that the inner hole of the clamp is the same as the inclination angle of the bottom hole motor. After the bottom hole motor is installed in the clamp, the up and down inclination angle of the frame is adjusted again. The second method is to dismantle the clamp as a whole, install the bottom hole motor and send it into the hole, and then reinstall the clamp to adapt to the installation of other drill rods. However, both methods will consume a lot of manpower and construction time, seriously affect construction efficiency, and have huge safety hazards. In this embodiment, large drilling tools such as the bottom hole motor can be directly placed in the through hole from the opening to reduce the adjustment and installation time to improve construction efficiency. At the same time, the reinforcing plate 243 can be detachably connected to the opening of the support plate 242, which can also ensure the structural strength of the support plate 242 during drilling and improve the stability of the front clamp installation.

[0048] When it is necessary to install large drilling tools such as bottom hole motors in a narrow environment, the guide sleeve assembly and reinforcement plate 243 are completely disassembled, the swing body is rotatably connected to the support plate 241 by the pin shaft 25, and the swing body is flipped by the drive of the swing cylinder 26 until the bottom of the swing body is away from the top opening of the support plate 242. At this time, the bottom hole motor is placed into the through hole through the opening, and the bottom hole motor is fixed by the rear clamp until the power head is successfully connected to the bottom hole motor and the bottom hole motor is drilled into the construction surface; then, the swing body is reset, the pin shaft 25 is removed, and a suitable guide sleeve assembly is installed to restore the double clamp state. At this time, the swing body can be driven to swing by the swing cylinder 26, so that the front clamp and the rear clamp rotate relative to each other, completing the unbuckling of the drill rod.

[0049] In addition, in order to ensure the connection or disconnection of the drill pipes of two specifications and avoid the problem of the drill pipe slipping during the connection or disconnection process, the present application also improves the structure of the slips, such as Figure 4As shown, the improved slip comprises an outer slip 221 and an inner slip 222, the inner surface of the outer slip 221 is provided with a rectangular plane 2211 for matching with the boss 2221 of the inner slip 222, the rectangular plane 2211 is provided with a threaded hole matching with the countersunk through hole provided with the boss 2221, two clamping blocks 2212 are vertically provided on both sides of the rectangular plane 2211, and the surfaces of the clamping blocks 2212 and the rectangular plane 2211 close to each other form four stop surfaces; the clamping blocks 2212 on the same side extend to each other to form two arc surfaces, and the diameter of the arc surface matches the larger drill pipe diameter and the outer diameter of the inner slip 222; the arc surface and the four stop surfaces are combined to form an installation space for the inner slip 222, the outer slip 221 is fixedly connected to the output shaft of the clamping cylinder by bolts, and forms a moving pair under the drive of the output shaft, and the inner slip 222 is detachably connected to the outer slip 221, and the detachable connection is bolted.

[0050] The front projection of the inner cava 222 is a "cross" shape, and the middle section cross-section of the inner cava 222 is an arc shape. Bosses 2221 are symmetrically provided on the upper and lower sides, and a countersunk through hole for installing screws connecting the outer cava 221 and the inner cava 222 is provided on the side of the boss 2221 facing the center of the through hole; the inner surfaces of the inner cava 222 and the outer cava 221 are provided with a number of bumps or small sharp teeth for increasing the friction with the surface of the drill pipe.

[0051] When the inner slip 222 is seriously worn or needs to be replaced from a drill rod with a smaller outer diameter to a drill rod with a larger outer diameter, the inner slip 222 needs to be disassembled. Simply retract the clamping cylinder, unscrew the connecting screws between the inner slip 222 and the outer slip 221, and the inner slip 222 can be disassembled to complete the replacement of the inner slip. When a drill rod with a larger rod diameter needs to be adapted, the inner slip 24 and the outer guide sleeve 252 need to be removed simultaneously to adapt the guide sleeve assembly to the drill rod. The installation steps are the opposite.

[0052] In addition, the sources of the pressure oil of the P1 boost oil circuit and the P2 boost oil circuit can be connected in series with the swing cylinder 26 or the B pipe, respectively, thereby reducing the additional oil circuit layout and the process of modifying the drilling rig oil circuit, thereby reducing the modification cost.

[0053] The above is only an embodiment of the present invention, and common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that the technical means for solving the problems in the above-mentioned embodiments of the present invention can be used in combination to solve multiple technical problems at the same time. For those skilled in the art, several modifications and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. Dual-gripper synchronous booster system, characterized by: The oil circuit of the oil cylinder is connected with the rod cavity of the oil cylinder, and the oil circuit of the rodless cavity is connected with the rodless cavity of the oil cylinder. The oil circuit of the oil cylinder is connected with the rod cavity of the oil cylinder. When the oil circuit of the oil cylinder is filled with oil or when the oil filling is stopped, the oil circuit of the rodless cavity is filled with oil through the oil circuit. The oil cylinder is connected with the rod cavity of the oil cylinder, and the oil circuit of the rodless cavity is connected with the rod cavity of the oil cylinder. The front clamp mounting part includes two groups of support plates and reinforcement plates. The support plate is provided with a through hole for the drill rod to pass through. An opening is provided at the top of the through hole. The opening makes the top of the through hole open. The width of the opening is larger than the diameter of the motor at the bottom of the hole. The reinforcement plate is detachably connected to the opening of the support plate. A flip plate is welded to the side wall of the support plate. A flip hole is provided on the flip plate. A pin shaft is provided between the flip hole and the swing body. A swing body is hinged on the base. A guide sleeve assembly is added to the swing body. The guide sleeve assembly and the pin shaft are installed selectively. When the swing cylinder is extended or retracted, it can drive the swing body to swing.

2. The dual-gripper synchronous supercharging system according to claim 1, characterized in that: The front clamper clamping cylinder control oil circuit and the rear clamper clamping cylinder control oil circuit both include hydraulic locks, the upper ends of the hydraulic locks are respectively connected to the rod chamber and rodless chamber of the front clamper clamping cylinder and the rear clamper clamping cylinder, and the connecting point between the booster oil circuit and the rodless chamber oil circuit is set between the hydraulic lock and the rodless chamber of the clamping cylinder.

3. The dual-gripper synchronous supercharging system according to claim 2 is characterized in that: A one-way valve is arranged between the boost oil circuit and the rodless chamber oil circuit.

4. The dual-gripper synchronous supercharging system according to claim 3 is characterized in that: The front clamping cylinder control oil circuit and the rear clamping cylinder control oil circuit are connected in parallel.

5. The dual-gripper synchronous supercharging system according to claim 4 is characterized in that: It also includes a power head steering control oil circuit, which includes tube A and tube B. When the pressure oil flows from tube A to tube B, the power head drills forward, and when the pressure oil flows from tube B to tube A, the power head reverses and unhooks. The front clamper clamping cylinder control oil circuit includes tube A1, which is connected to the rod cavity through a hydraulic lock to form the front clamper rod cavity oil circuit. The rear clamper clamping cylinder control oil circuit includes tube A2, which is connected to the rear clamper rod cavity through a hydraulic lock to form the rear clamper rod cavity oil circuit. Before tube A is filled with oil, tubes A1 and A2 are filled with oil in advance.

6. The dual-gripper synchronous supercharging system according to claim 5, characterized in that: The front clamper clamping cylinder control oil circuit also includes a B1 tube, which is connected to the rodless cavity through a hydraulic lock to form a front clamper rodless cavity oil circuit; the rear clamper clamping cylinder also includes a B2 tube, which is connected to the rodless cavity of the rear clamper clamping cylinder through a hydraulic lock to form a rear clamper rodless cavity oil circuit; when the hydraulic lock maintains pressure in the rodless cavity, oil is fed into the booster oil circuit.

7. The dual-gripper synchronous supercharging system according to claim 6, characterized in that: The boost oil circuit includes a P1 boost oil circuit and a P2 boost oil circuit, and the P1 boost oil circuit and the P2 boost oil circuit supply oil at the same time.

8. The dual-gripper synchronous supercharging system according to claim 7, characterized in that: It also includes a reversing valve, which is arranged between the P1 pressurized oil circuit, the P2 pressurized oil circuit, and the front clamper rodless chamber oil circuit and the rear clamper rodless chamber oil circuit.

9. The dual-gripper synchronous supercharging system according to claim 8, characterized in that: A one-way valve is also arranged between the reversing valve and the rodless chamber oil circuit of the front clamp and the rodless chamber oil circuit of the rear clamp.

10. The dual-gripper synchronous supercharging system according to claim 9, characterized in that: The reversing valve is a solenoid valve.

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