A large hole dual chuck and associated rotator and feed device

Abstract

The application discloses a large-hole double chuck and related rotary device and feeding device. The disclosed large-hole double chuck comprises a main shaft provided with a stepped inner hole, a front chuck provided in the large-diameter hole of the main shaft, and a rear chuck connected to the rear end. The rotary device adopts the large-hole double chuck. The feeding device is provided with a gripper and the large-hole double chuck rotary device. During construction, the front and rear chucks quickly clamp and seal the drill rod and the water braid, the number of times of screwing and unscrewing of each drill rod thread is reduced from 2 times to 1 time, the service life of the drill rod is improved, and the construction efficiency of the drilling machine is improved. During automatic drilling machine construction, a thread unscrambler is not needed, the front chuck of the rotary device adopts a built-in structure, the length of the feeding device is greatly shortened, and the flexibility of the drilling machine construction is improved.

Description

Technical Field

[0001] This invention belongs to the field of drilling rig technology, specifically relating to a large-hole double chuck and related rotary and feed devices. Background Technology

[0002] Existing drilling rigs all use an intermediate drill rod addition / removal module. The rotary head for this method is either an active drill rod type or an external single chuck type for holding the active drill rod. During automatic drilling, both of these rotary head structures require two thread tightening / untightening operations for each drill rod added or removed: one at the connection between the drill rod to be tightened and the drill rod in the hole, and another at the connection between the drill rod to be tightened and the active drill rod (ordinary drilling rig rotary heads often use an external single chuck, which also requires two thread tightening / untightening operations when adding a drill rod: one at the connection between the new drill rod and the drill rod in the hole, and another at the connection between the new drill rod and the water braid). This excessive number of thread tightening / untightening operations significantly impacts the lifespan of the drill rod and the drilling rig's efficiency. Meanwhile, in order to ensure the threaded connection between the newly added drill rod and the active drill rod and the drill rod inside the hole, the drilling rig also needs to be equipped with a chuck. The chuck and external single chuck will increase the length of the drilling rig's feed device and increase the overall size of the drilling rig, thus affecting the flexibility of the drilling rig. Summary of the Invention

[0003] In view of the defects or deficiencies of the prior art, the present invention provides a large through-hole dual chuck.

[0004] Therefore, the large through-hole dual chuck provided by the present invention includes:

[0005] The main shaft has a hollow internal structure, which includes a large-diameter section and a small-diameter section, arranged sequentially along the axial direction. The main shaft also has a main oil passage with a main oil inlet. Front chuck; The rear chuck includes a rotating cylinder and a rubber sleeve; the rubber sleeve and the rotating cylinder are sequentially fitted from the inside to the outside, and a gap is left between the outer wall of the rubber sleeve and the inner wall of the rotating cylinder to form an annular oil cavity; the rubber sleeve and the rotating cylinder are axially sealed at both ends. The front chuck is installed inside the spindle and located in the large-diameter section. The rotating cylinder end of the rear chuck is connected to the end of the spindle, and the rear chuck is located at the end of the small-diameter section. The spindle, the front chuck, and the rear chuck are coaxial. At the same time, the interior of the front chuck, the small-diameter section of the spindle, and the interior of the rubber sleeve are connected to form a drill pipe receiving space. The port of the rubber sleeve away from the spindle is the water braid installation port. The main oil passage is connected to the oil passage inside the front chuck and the annular oil cavity, respectively.

[0006] Another type of large through-hole dual chuck provided by the present invention includes: The main shaft has a hollow internal structure, which includes a large-diameter section and a small-diameter section, arranged sequentially along the axial direction. The main shaft also has a main oil passage with a main oil inlet. Front chuck; The rear chuck includes a cylindrical shell, a rotating cylinder, and a rubber sleeve. Bearings are installed on the inner walls of both axial ends of the shell, and an oil inlet is provided on the shell. The rubber sleeve, rotating cylinder, and shell are sequentially fitted from the inside out, with a gap between the outer wall of the rubber sleeve and the inner wall of the rotating cylinder forming an annular oil cavity. The axial ends of the rubber sleeve, rotating cylinder, and shell are sealed together. The rotating cylinder is connected to the bearings, and the rotating cylinder and rubber sleeve can rotate relative to the shell. The annular oil cavity is connected to the oil inlet. The front chuck is installed inside the spindle and located in the large diameter section. The rotating cylinder end of the rear chuck is connected to the end of the spindle, and the rear chuck is located at the end of the small diameter section. The spindle, the front chuck, and the rear chuck are coaxial. At the same time, the interior of the front chuck, the small diameter section of the spindle, and the interior of the rubber sleeve are connected to form a drill pipe receiving space. The port of the rubber sleeve away from the spindle is the water braid installation port. The main oil passage is connected to the oil passage inside the front chuck.

[0007] In a further embodiment, a water braid is inserted into the water braid mounting port, and the water braid extends into the rubber tube.

[0008] An alternative is that the inner diameter of the small-diameter section is greater than or equal to 135mm.

[0009] An alternative is that the front chuck is installed inside the large diameter section of the spindle, and the axial ends of the front chuck are matched and connected to the axial end walls of the large diameter section through grooves and protrusions.

[0010] Alternatively, the rotating cylinder can be connected to the end of the main shaft via a limiting clamp and screwed together.

[0011] An alternative solution includes an end cap with a drill rod through hole. The end cap is installed at the axial end of the spindle and is located at the end of the large diameter section. The end cap has a stepped shape, and the end furthest from the spindle is the small diameter end.

[0012] The present invention also provides a rotary device, which includes the above-mentioned large through-hole double chuck, braking assembly, encoder assembly, gearbox and hydraulic motor; The hydraulic motor drives the spindle of the large-hole double chuck to rotate through the gearbox. The encoder assembly is used to monitor and provide feedback on the spindle speed of the rotary machine. The braking assembly brakes the gearbox gear shaft to stop the rotary machine spindle from rotating.

[0013] The present invention also provides a feeding device, wherein a clamp and the aforementioned rotary device are mounted on the feeding device; the clamp and the rotary device are distributed along the feeding direction of the feeding device, and the feeding direction of the feeding device is along the axial direction of the main shaft of the rotary device.

[0014] The present invention relates to a rapid clamping and sealing double chuck with a large through-hole, comprising a main shaft with a stepped inner hole, a front chuck disposed within the large-diameter hole of the main shaft, and a rear chuck connected to the rear end. During construction, the front and rear chucks rapidly clamp and seal the drill rod and water braid, reducing the number of times each drill rod thread is tightened and loosened from two to one, thereby improving the service life of the drill rod and the construction efficiency of the drilling rig. When operating an automatic drilling rig, no uncoupling device is required; the front chuck of the rotary head has a built-in structure, significantly shortening the length of the feed device and improving the flexibility of the drilling rig.

[0015] The robotic arm places the new drill rod in the insertion position. The large-hole double chuck rotary head moves forward, allowing the drill rod to pass through the spindle through-hole and contact the water braid. Then, the front and rear chucks quickly clamp the drill rod. The front chuck transmits torque and works with the clamping device to achieve a threaded connection between the new drill rod and the drill rod already in the hole. The rear chuck quickly clamps the new drill rod and the water braid, creating a fluid-sealed channel without the need for a threaded connection. This allows water or air to enter the drill rod's internal channel through the water braid until drilling reaches the bottom of the hole. With the automatic drilling rig, each new drill rod only requires loosening and unloosening the connecting threads between the new drill rod and the existing drill rod to begin drilling. The number of times the threads need to be loosened and unloosened per drill rod is reduced from two to one, greatly improving efficiency. This improves the service life of drill rods and the construction efficiency of drilling rigs. When lifting and unloading drill rods, the number of times each drill rod thread is tightened and loosened is reduced from 2 to 1. (When drilling with a conventional drilling rig, an additional drill rod is added and passed through the main shaft through hole of the double chuck rotary head. The front chuck quickly clamps the drill rod to transmit the drilling rig torque, and the rear chuck quickly clamps the drill rod and the water braid to form a fluid-sealed channel. This allows water or air to enter the internal channel of the drill rod through the water braid until the bottom of the hole for drilling. The drilling rig only needs to loosen and loosen the connecting threads between the new drill rod and the drill rod in the hole, without loosening and loosening the connecting threads between the new drill rod and the water braid to form a fluid-sealed channel, which greatly improves the service life of drill rods and the construction efficiency of drilling rigs.) Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the large through-hole double chuck of the present invention.

[0017] Figure 2 This is a schematic diagram of a spindle structure with a front chuck installed.

[0018] Figure 3 This is a schematic diagram of the structure of the rear chuck of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the rotary device related to the present invention.

[0020] Figure 5This is a schematic diagram of the drilling rig of the present invention.

[0021] Figure 6 This is an example of the working state diagram of the drilling rig of the present invention.

[0022] In the diagram: 1-Spindle, 2-Front chuck, 3-Rear chuck, 4-End cap, 5-Drill pipe, 6-Water braid, 11-Spindle large diameter section, 12-Spindle small diameter section, 13-Main oil passage, 14-Main oil inlet, 15-Limiting chuck, 31-Housing, 32-Bearing, 33-Rotating cylinder, 34-Rubber sleeve, 35-Annular oil cavity, 36-Oil inlet, 37-Radial oil passage, 38-Guide ring, 391-Pressure cap, 392-Outer pressure ring, 393-Support ring A, 394-Inner pressure ring, 395-Support ring B, 396-Rubber block, 01-Brake assembly, 02-Front chuck, 03-Rear chuck, 04-Encoder assembly, 05-Gearbox, 06-Hydraulic motor, 07-Oil filter, 101-Oil tank, 102-Motor pump unit, 103-Car body, 104-Control system, 105-Repair rod device, 106-Clamping device, 107-Feeding device, 108-Repairing robotic arm, 109-Angle adjustment device, 110-Large through-hole double chuck rotary head, 111-Drill rod inside the hole, 112-Added drill rod. Detailed Implementation

[0023] Unless otherwise specified, the scientific and technical terms used in this article are intended for understanding by those skilled in the art.

[0024] The axial, circumferential, inner and outer, end, and other directional or orientational terms used herein are consistent with the corresponding directions or orientations in the accompanying drawings. It should be noted that the accompanying drawings are intended to explain the present invention, and any equivalent solutions obtained by those skilled in the art based on the disclosure herein by means of rotation, substitution, etc., are within the scope of the present invention.

[0025] Example 1: See Figure 1 and 2 As shown, the large-diameter double chuck of the present invention mainly includes a main shaft 1, a front chuck 2, and a rear chuck 3. The main shaft 1 is a hollow structure, which is arranged axially inside the main shaft and is composed of a large-diameter section 11 and a small-diameter section 12 (see...). Figure 2 As shown, the inner diameter of the small diameter section is smaller than the inner diameter of the large diameter section, and the two form a stepped hole structure. At the same time, the main oil passage 13 is provided in the spindle wall, and the main oil inlet 14 is provided on the main oil passage. The rear chuck in this invention can be equipped with internal or external oil inlet. When the internal oil inlet method is used, the rear chuck structure includes a rubber sleeve 34 and a rotating cylinder 33, which are sequentially fitted from the inside to the outside. A gap is left between the outer wall of the rubber sleeve and the inner wall of the rotating cylinder to form an annular oil cavity 35. The rubber sleeve and the rotating cylinder are axially limited and sealed at both ends. The front chuck 2 is installed in the large-diameter section 11 of the spindle. The end of the rotating cylinder 33 of the rear chuck 3 is connected to the end of the small-diameter section of the spindle. At the same time, the spindle, the front chuck, and the rear chuck are coaxial, so that the interior of the front chuck, the small-diameter section of the spindle, and the interior of the rubber sleeve are connected to form a drill pipe accommodating space. Furthermore, the main oil passage is connected to the oil passage inside the front chuck and the annular oil cavity 35 of the rear chuck. During operation, the main oil supply port on the main oil passage supplies oil to the front chuck and the rear chuck.

[0026] When using an external oil inlet method, based on the aforementioned internal oil inlet structure, the rear chuck also includes a housing 31. Bearings 32 are installed on the inner walls at both axial ends of the housing, and an oil inlet 36 is provided on the housing. The rubber sleeve, rotating cylinder, and housing are sequentially assembled from the inside out. The rotating cylinder is connected to the bearings, and the rotating cylinder and rubber sleeve can rotate relative to the housing. At the same time, the annular oil cavity 35 communicates with the oil inlet 36. The main oil passage communicates with the oil passage inside the front chuck. During operation, oil is supplied to the rear chuck through the oil inlet 36, and oil is supplied to the front chuck through the main oil inlet 14. The rear chuck compresses the rubber sleeve through the high-pressure oil entering the annulus, causing the rubber sleeve to move radially to clamp the drill pipe and water braid for sealing.

[0027] To achieve the internal integration of the front chuck, the present invention designs a through hole inside the spindle. The inner through hole is a stepped hole. The front chuck (such as an existing chuck composed of a rubber sleeve, chuck, support ring, inner and outer torsion plates, end pressure ring, etc.) is placed at the large end of the stepped hole of the spindle to achieve the internal integration of the chuck. In the specific design, the larger the inner through hole of the spindle (e.g., the inner diameter of the small diameter section is greater than or equal to 135mm), the more drill bit specifications can be used, and the stronger the applicability. Under the premise of ensuring the function of the front built-in chuck, increasing the diameter of the inner through hole of the spindle will inevitably lead to an increase in the large end of the front built-in chuck housing, i.e., the stepped shaft of the spindle. The spindle is a rotating component during construction and bearings need to be installed on it. The larger the outer diameter of the spindle, the larger the selected bearings, and the larger the corresponding part of the gearbox housing will be. This will bring a series of problems such as difficulty in bearing heat dissipation, reduced speed, and interference with the gearbox housing. To solve this key point, an end cap 4 is set at the large diameter end of the spindle. The end cap has a drill rod through hole, and the overall structure of the end cap is designed as a stepped shape. Its large diameter end is connected to the spindle, and the small diameter end is used to install the bearing. Thus, the bearing is arranged on the end cap of the front built-in chuck, which increases the diameter of the inner through hole of the front built-in chuck and reduces the size of the bearing and the corresponding size of the gearbox housing.

[0028] During operation, a water braid 6 is installed at the port of the rear chuck's rubber sleeve furthest from the spindle. The structure of the water braid 6, which is used to connect with the drill rod 5, extends into the rubber sleeve, and the other end is sealed to the port of the rubber sleeve with a flange. The built-in front chuck holds the drill rod to transmit torque, and the rear chuck quickly clamps the drill rod 5 and the water braid. The fluid channel between the two is sealed by the rubber sleeve of the rear chuck (traditional power heads require the drill rod to be tightened with threads to achieve a fluid seal. During construction, each additional drill rod requires tightening the connecting threads between the drill rod and the active drill rod or water braid. A long directional borehole may have hundreds or even thousands of drill rods, requiring hundreds or thousands of tightening operations. During the removal of drill rods, each drill rod needs to be unscrewed and re-unscrewed. These actions greatly affect the construction efficiency of automatic drilling rigs).

[0029] Working principle of the large-hole double chuck rotary head of the present invention (taking internal oil inlet method as an example): High-pressure oil enters the oil passage 13 on the side wall of the front internal chuck spindle through the main oil inlet 14 and the main oil passage 13 on the spindle. It is then divided into two paths to supply oil to the front internal chuck and the rear chuck respectively. When the high-pressure oil enters the front internal chuck, it continuously clamps the drill rod to transmit torque. (Taking an existing chuck composed of rubber sleeve, slips, support ring, inner and outer torque transmission discs, end pressure rings and other components as an example, when the high-pressure oil enters the annular oil cavity of the front chuck, the high-pressure oil compresses the rubber sleeve of the front internal chuck. Due to the axial limitation of the inner and outer torque transmission discs, the rubber sleeve can only be compressed radially, driving the slips to move radially along the guide grooves of the inner and outer torque transmission discs. The springs between the slips are compressed. When the slips contact the drill rod, under the action of the high-pressure oil, the slips continuously clamp the drill rod to transmit torque.) When high-pressure oil enters the rear chuck annular oil chamber 35, the high-pressure oil compresses the rear chuck sleeve 34, which is compressed radially to achieve rapid clamping of the drill rod 16 and the water braid 1. Under the action of high-pressure oil, the rear chuck sleeve 2 is tightly attached to the cylindrical surfaces of the drill rod 16 and the water braid 1, forming a sealed fluid channel between the drill rod 16 and the water braid 1. This prevents water entering from the water braid from leaking from the contact surface between the rear chuck sleeve 2 and the drill rod 16 and the water braid 1, and it can only drive the bottom hole motor to rotate and drill from the through hole inside the drill rod.

[0030] This invention does not modify the main structure and working principle of the front chuck. The front chuck is installed inside the large-diameter section of the spindle (the spindle acts as the housing of the front chuck) and forms a double chuck with the rear chuck, enabling the disassembly of the drill pipe. It should be noted that, for installation positioning and convenient disassembly, the front chuck is connected to both axial ends of the large-diameter section via a matching protrusion and groove structure. Specifically, multiple evenly distributed protrusions are provided along the circumference of both ends of the front chuck, and correspondingly, multiple evenly distributed grooves are provided along the circumference of the inner wall of both axial ends of the large-diameter section. During assembly, the protrusions are matched and positioned with the corresponding grooves.

[0031] For ease of assembly, some designs involve connecting the rotating cylinder to the main shaft via a limiting clamp 15 and screwing them together.

[0032] In a further design, an end cap is fitted to the large-diameter section of the spindle, and a limiting plate is provided on the end cap.

[0033] In the specific design, the rubber sleeve in the rear chuck is sealed to the axial ends of the rotating cylinder via a pressure cap 391, an outer pressure ring 392, a support ring A393, an inner pressure ring 394, a support ring B395, and a rubber block 396. Specifically, support rings A393 and B395, an inner pressure ring 394, and an outer pressure ring 392 are coaxially installed at both ends of the rubber sleeve to axially limit its movement. The rubber block 396 is coaxially installed between the inner pressure ring and the support ring 2, and between the inner pressure ring 10 and the support ring A, for shock absorption and sealing. The pressure cap 391 is screwed to the support ring A and the rotating cylinder to axially limit the internal parts of the rear chuck.

[0034] In a more specific embodiment, the annular oil chamber 35 inside the rear chuck is connected to the main oil passage inside the spindle via a radial oil passage 37.

[0035] In some designs, a guide ring 38 is also installed in the rear chuck. The guide ring 38 is coaxially connected to the rotating cylinder 8 and is located at the end of the spindle. When the drill rod enters the rear chuck, it is guided by the conical surface on the guide ring 1 to ensure that the drill rod enters the rear chuck smoothly.

[0036] Example 2: See Figure 4 As shown, the rotary device provided by the present invention mainly includes a large through-hole double chuck (02, 03), a braking assembly 01, an encoder assembly 04, a gearbox 05, and a hydraulic motor 06.

[0037] The spindle of the large-bore double chuck is located inside the gearbox, which contains two small gears and corresponding drive shafts A and B. The housing of the braking assembly 01 is screwed and fixed to the gearbox 05. The inner shaft of the braking assembly is coaxial with the small gear drive shaft A of the gearbox and connected by a key. The rotation of the small gear drive shaft A of the gearbox is restricted by the inner shaft braking, thereby ensuring that the drill rod is not rotated by the front chuck of the large through hole double chuck rotary device of the drilling rig. Water or air enters the inner through hole of the drill rod through the water braid until it reaches the bottom of the hole to drive the screw motor to rotate for directional drilling. The encoder assembly housing 04 is screwed and fixed to the gearbox. The inner shaft of the encoder assembly is connected to the other pinion drive shaft B of the gearbox by a key, which feeds back the rotary speed signal to the control system for speed control and matching when adjusting the buckle and tool face angle. The hydraulic motor 06 is coaxially keyed to the two pinion shafts of the gearbox. The two pinions transmit the speed and torque of the hydraulic motor to the main shaft, driving the main shaft to rotate.

[0038] During operation, the encoder assembly monitors the feedback rotational speed of the rotary head shaft, allowing the control system to adjust the shaft speed accordingly. The braking assembly uses high-pressure hydraulic pressure to drive friction plates, braking the gearbox shaft and stopping the rotary head shaft to facilitate directional drilling. The hydraulic motor, mounted on the gearbox housing, is coaxial with the gear shaft and transmits speed and torque via a spline connection, driving the internal gears to rotate, which in turn rotates the rotary head shaft.

[0039] Furthermore, the gearbox housing is also equipped with an oil filter 07. High-pressure oil is filtered by the oil filter and enters the main oil passage 13 on the spindle of the front built-in chuck (in the case of external oil inlet scheme, it also directly supplies oil to the rear chuck), providing high-pressure oil to the front built-in chuck and the rear chuck, so that the front built-in chuck clamps the drill bit to transmit torque, and the rear chuck quickly clamps and seals the fluid sealing channel between the drill rod and the water braid.

[0040] Example 3: The feeding device 107 of this invention has a clamp 106 at one end and a large-hole double chuck rotary head 110 at the other end. Further related drilling rigs include a vehicle body 103, on which the feeding device 107 and a rod-adding robotic arm 108 are mounted, with the robotic arm 108 located beside the feeding device. The drilling process using this drilling rig includes: ① The clamp holds the drill rod in the hole. After the rod-adding robot arm grabs the drill rod, it swings until it is coaxial with the main shaft of the rotary machine, and then the rod-adding robot arm stops swinging. ② The feed device drives the large through hole double chuck rotary head forward. When the left end of the drill rod enters the rear chuck and connects with the water braid, the displacement sensor sends a signal that the drill rod is in the sealed position, and the feed device stops moving forward. ③ The high-pressure oil-driven large-hole double chuck rotary device quickly clamps the front and rear chucks. The rear chuck clamps the water braid and drill rod, sealing the fluid channel between the drill rod and the water braid. Then the rod-adding robotic arm leaves the rod-adding position. ④ The spindle drives the drill rod and water braid to rotate forward, and at the same time the feed device moves forward to perform thread engagement between the new drill rod and the drill rod in the hole. After the thread engagement between the new drill rod and the drill rod in the hole is completed, the clamp opens. ⑤ The rotary head spindle rotates forward, the feed device moves forward, the water braid is circulated, and the drill rod is drilled. ⑥ After the drilling of the new drill rod is completed, the rotary head stops rotating forward, the feed device stops advancing, the clamp tightens the drill rod, the front and rear chucks of the rotary head release the drill rod, the feed device retreats, and waits for the rod-adding robotic arm to place the next new drill rod in the rod-adding position to start the next round of rod-adding drilling process.

[0041] More specifically, as standard working components of the drilling rig, the vehicle body also includes a motor pump unit 102, an oil tank 101, a drill rod replenishment device 105, an angle adjustment device 109, a control system 104, and a displacement sensor for monitoring drill rod displacement, with the structure as follows: Figure 5 As shown.

[0042] In the specific design, the installation positions of each working component on the vehicle body are determined based on the working relationships of each component and the size of the vehicle body. In this embodiment, the vehicle body is a tracked vehicle body, and the tracked vehicle body platform is used for the drilling rig to move and for installing and supporting the various modular components of the drilling rig; The oil tank is located at the left rear of the vehicle body and provides hydraulic oil to the drilling rig. The motor pump unit provides power to the drilling rig and is bolted to the vehicle body. The pump unit is placed in the recessed space inside the oil tank. The rod replenishment device is screwed and fixed to the front left of the vehicle body, which is used to store drill rods for the drilling rig and transfer the drill rods to the rod replenishment robot arm; The angle adjustment device is bolted to the vehicle body at the bottom and connected to the feed device at the top via a pin, and is used to adjust the tilt angle of the drilling rig spindle; The feeding device and the angle adjustment device are connected by a pin. The feeding cylinder drives the large through hole double chuck rotary head to slide back and forth along the feed device guide rail to perform the addition and removal of drill rods and drilling construction. The connecting pin of the rod-adding robotic arm is coaxially installed with the feeding device and the angle adjustment device, and can move in a circular motion along the pin to meet the rod-adding requirements of the drilling rig at both the elevation and depression angles. The large through-hole double chuck rotary head is screwed to the feed device support plate and is used to clamp the drill rod, seal the fluid sealing channel between the drill rod and the water braid, and realize the rotary drilling or directional drilling function of the drilling rig. The clamp is screwed to the front end of the feeding device and works with the large through-hole double chuck rotary device to unscrew and clamp the drill rod inside the hole, preventing the drill rod from slipping down and causing a safety accident.

[0043] The control system is used to control the operation of various components of the drilling rig. Specifically, it drives the operation of each component by controlling the on / off state, reversal, and opening degree of the solenoid valves based on the signals collected by the sensors.

[0044] This embodiment of the drilling rig Drilling with rod Controlled construction (see) Figure 5 and 6 The process is as follows; ① The clamp holds the drill rod in the hole. After the rod-adding robotic arm 108 grabs the drill rod, it swings to the rod-adding position, which is coaxial with the main shaft of the rotary device. At this time, the proximity switch sends a signal to the control system that the drill rod has reached the rod-adding position, and the rod-adding robotic arm 108 stops swinging. ② The control system controls the solenoid valve group to operate in conjunction with the feed device 107. The high-pressure oil drives the feed device 1077 to drive the large through hole double chuck rotary head forward. When the left end of the drill rod enters the rear chuck, the displacement sensor sends a signal that the drill rod is in the sealed position, and the feed device stops driving the large through hole double chuck rotary head forward. ③ The control system controls the chuck linkage in the solenoid valve group. High-pressure oil drives the front and rear chucks of the large through-hole double chuck rotary head to quickly clamp. The front chuck quickly clamps the drill rod to transmit torque and realize the screw tightening and loosening of the drill rod threads and drilling. The rear chuck quickly clamps the water braid and the drill rod, sealing the fluid channel between the two (there is no need to tighten the connecting threads of the water braid and the drill rod for sealing. Directional long drilling construction requires hundreds or thousands of drill rods. This innovation reduces the number of screw tightening and loosening times by hundreds or thousands, which greatly improves the construction efficiency of the automatic drilling machine). Then the control system controls the rod-adding robotic arm 108 to leave the rod-adding position. ④ The control system controls the rotation coupling and feed device 107 in the solenoid valve group to operate in tandem. The high-pressure oil drives the rotary motor to drive the front and rear chucks to clamp the drill rod and water braid to rotate forward. At the same time, the feed device moves forward to perform thread engagement between the new drill rod and the drill rod 111 in the hole. When the new drill rod 112 and the drill rod in the hole have completed thread engagement, the displacement sensor sends a signal that the drill rod thread engagement is complete. Then the control system controls the clamp to open. ⑤ The control system controls the rotation and feed devices in the solenoid valve group to operate in conjunction. High-pressure oil drives the rotary head to rotate forward and the feed device to move forward to carry out rotary drilling construction, or high-pressure oil drives the feed device to move forward and the water entering the water braid reaches the bottom of the hole to drive the bottom motor to rotate to carry out directional drilling construction. ⑥ When the newly added drill rod is lowered into the borehole by the rotary head and the left end of the drill rod reaches the upper / lower position (i.e., the drilling of the newly added drill rod is completed), the displacement sensor sends a signal that the drill rod has reached the upper / lower position. The control system controls the rotary valve group, feed device group, clamping device group, and chuck group to operate. The rotary head stops rotating forward, the feed device stops advancing, the clamping device quickly clamps the drill rod, and the front and rear chucks of the rotary head release the drill rod. Subsequently, the control system controls the feed device group in the solenoid valve group to operate. The feed device retracts to the end, waiting for the drill rod adding robot arm to place the drill rod in the adding position, and the next round of drill rod adding process begins.

[0045] Corresponding to the above drilling rig construction, Unload the rod and lift the drill. The construction process is as follows; ① The control system controls the chuck, gripper, and feed device in the solenoid valve group to operate in a coordinated manner. The front and rear chucks of the rotary head quickly clamp the drill rod to be lifted, the gripper releases the drill rod to be lifted, and the feed device retracts to lift the drill. ② When the displacement sensor sends a signal that the drill rod to be lifted has reached the upper uncoupling position, the control system controls the clamping and rotation linkage to operate. The clamping device clamps the drill rod in the hole, the feed device retracts, and the front and rear chucks of the rotary head clamp the drill rod to be lifted for reverse uncoupling (when lifting the drill, it is only necessary to complete the uncoupling of the drill rod with uncoupling and the drill rod in the hole, without the need to uncoupling the drill rod with uncoupling and the active drill rod, so that the number of uncoupling times for each drill rod during the lifting process is reduced from 2 times to 1 time. Directional long drilling construction requires hundreds or thousands of drill rods. This innovation reduces the number of screw tightening and uncoupling times by hundreds or thousands of times, which greatly improves the construction efficiency of automatic drilling rigs). After uncoupling is completed, the front and rear chucks of the rotary head clamp the drill rod with uncoupling and continue to retract. ③ When the displacement sensor sends a signal that the drill rod has reached the rod loading position, the control system controls the rotary head to stop rotating, the feed device to stop retracting, and the rod loading robot arm swings to the rod loading position (the proximity switch determines whether it has reached the position) and grabs the drill rod to be lifted. ④ Subsequently, the control system controls the front and rear chucks of the rotary head to release the drill rod to be unloaded, and the feed device to retract to the last position; ⑤ When the feed device retracts to the last position, the displacement sensor sends a rod-retrieving signal, and the control system controls the rod-adding robotic arm to grab the drill rod to be unloaded from the main unit, and proceed with the next drill rod lifting process.

[0046] Based on the above-mentioned process, the present invention relates to a large-hole double-chuck rotary drilling rig with rapid clamping and sealing and its control and construction method. It adopts a novel design and control and construction method for a large-hole double-chuck rotary drilling rig with rapid clamping and sealing function. It solves the problems of automatic drilling rigs requiring a uncoupling device to unscrew the drill rod threads and external chuck placement, which occupy the length of the feed device and affect the drilling rig's construction flexibility. It also solves the problems of the large number of times each drill rod thread is unscrewed during drilling and hoisting, which affects the service life of the drill rod and the drilling rig's construction efficiency. It is beneficial to reduce the length of the drilling rig's feed device and improve the drilling rig's flexibility, drill rod service life and drilling rig construction efficiency.

[0047] It is obvious that the above description and account are merely illustrative and not intended to limit the disclosure, application, or use of this invention. Although embodiments have been described and illustrated in the accompanying drawings, the invention is not limited to the specific examples exemplified by the drawings and described in the embodiments as currently considered the best mode for carrying out the teachings of the invention. The scope of the invention will include any embodiments falling within the foregoing description and the appended claims.

Claims

1. A double chuck with a large through-hole, characterized in that, include: The main shaft (1) has a hollow structure inside, and the hollow structure is provided with a large diameter section (11) and a small diameter section (12), and the large diameter section and the small diameter section are arranged sequentially along the axial direction; the main shaft is also provided with a main oil passage (13), and a main oil inlet (14) is provided on the main oil passage. Front chuck (2); The rear chuck (3) includes a rotating cylinder (33) and a rubber tube (34); the rubber tube and the rotating cylinder are fitted together from the inside to the outside, and a gap is left between the outer wall of the rubber tube and the inner wall of the rotating cylinder as an annular oil cavity (35), and the rubber tube and the rotating cylinder are sealed at both ends in the axial direction; The front chuck (2) is installed inside the spindle and located in the large diameter section (11). The rotating cylinder end of the rear chuck (3) is connected to the end of the spindle, and the rear chuck is located at the end of the small diameter section. The spindle, the front chuck and the rear chuck are coaxial. At the same time, the interior of the front chuck, the small diameter section of the spindle and the inner body of the rubber sleeve are connected to form a drill pipe accommodating space. The port of the rubber sleeve away from the spindle is the water braid installation port. The main oil passage is connected to the oil passage inside the front chuck and the annular oil cavity, respectively.

2. A large through-hole double chuck, characterized in that, include: The main shaft (1) has a hollow structure inside, and the hollow structure is provided with a large diameter section (11) and a small diameter section (12), and the large diameter section and the small diameter section are arranged sequentially along the axial direction; the main shaft is also provided with a main oil passage (13), and a main oil inlet (14) is provided on the main oil passage. Front chuck (2); The rear chuck (3) includes a cylindrical shell (31), a rotating cylinder (33), and a rubber sleeve (34); bearings (32) are installed on the inner walls of both axial ends of the shell, and an oil inlet (36) is provided on the shell; the rubber sleeve, rotating cylinder, and shell are sequentially fitted from the inside to the outside, and a gap is left between the outer wall of the rubber sleeve and the inner wall of the rotating cylinder to form an annular oil cavity (35); the axial ends of the rubber sleeve, rotating cylinder, and shell are sealed together; the rotating cylinder is connected to the bearing, and the rotating cylinder and the rubber sleeve can rotate relative to the shell; at the same time, the annular oil cavity is connected to the oil inlet (36); The front chuck (2) is installed inside the spindle and located in the large diameter section (11). The rotating cylinder end of the rear chuck (3) is connected to the end of the spindle, and the rear chuck is located at the end of the small diameter section. The spindle, the front chuck and the rear chuck are coaxial. At the same time, the interior of the front chuck, the small diameter section of the spindle and the inner body of the rubber tube are connected to form a drill pipe accommodating space. The port of the rubber tube away from the spindle is the water braid installation port. The main oil passage is connected to the oil passage inside the front chuck.

3. The large through-hole double chuck according to claim 1 or 2, characterized in that, The water braid is inserted into the water braid mounting port, and the water braid extends into the rubber tube.

4. The large through-hole double chuck according to claim 1 or 2, characterized in that, The inner diameter of the small-diameter section is greater than or equal to 135 mm.

5. The large through-hole double chuck according to claim 1 or 2, characterized in that, The front chuck is installed inside the large diameter section of the spindle, and the two axial ends of the front chuck are matched and connected to the two axial end walls inside the large diameter section through grooves and protrusions.

6. The large through-hole double chuck according to claim 1 or 2, characterized in that, The rotating cylinder is connected to the end of the main shaft by a limiting clamp (15) and screwed together.

7. The large through-hole double chuck according to claim 1 or 2, characterized in that, It also includes an end cap (4) which has a drill rod through hole. The end cap is installed at the axial end of the main shaft and is located at the end of the large diameter section. The end cap is stepped in shape and the end away from the main shaft is the small diameter end.

8. A rotary device, characterized in that, Includes the large through-hole double chuck (02, 03), braking assembly (01), encoder assembly (04), gearbox (05) and hydraulic motor (06) as described in claim 1 or 2. The hydraulic motor drives the spindle of the large-hole double chuck to rotate through the gearbox. The encoder assembly is used to monitor and provide feedback on the spindle speed of the rotary machine. The braking assembly brakes the gearbox gear shaft to stop the rotary machine spindle from rotating.

9. A feeding device, characterized in that, The feeding device is equipped with a clamp and the rotary device as described in claim 8; the clamp and the rotary device are distributed along the feeding direction of the feeding device, and the feeding direction of the feeding device is along the axial direction of the main shaft of the rotary device.

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