Prying and clamping mechanism assembly suitable for water milling drill drilling rock core and regulation and control method

Abstract

The invention belongs to the technical field of water milling drills, and discloses a prying and clamping mechanism assembly suitable for a drilling rock core of a water milling drill and a regulation and control method. The matching body comprises a prying and clamping cylinder outer barrel, an outer barrel end cover, a prying and clamping cylinder middle barrel, a prying and clamping cylinder middle piston rod, a prying and clamping assembly body, a clamping jaw pin shaft, a pivot point and a clamping jaw opening and closing pin shaft, wherein the pivot point is used for connecting the prying and clamping cylinder middle barrel with a clamping jaw of the prying and clamping assembly body, so that the clamping jaw can rotate around the clamping jaw pin shaft; a middle piston rod of the prying and clamping cylinder is connected with a pivot point of the locking sleeve of the prying and clamping assembly body, the piston rod axially moves to drive the clamping jaw opening and closing pin shaft to move in the direction of a key groove in one side of the middle cylinder, the locking sleeve is driven to move, and opening and closing of the clamping jaw are directly controlled. An existing hydraulic system of the water milling drilling machine is directly used for supplying energy, and an extra power source is not needed. Equipment transportation in plateau areas is difficult, the mechanism can meet the multi-caliber sampling requirement only by carrying a light-weight clamping jaw assembly replacement bag, the cost of spare parts is reduced, and the modular structural design, compatibility and maintainability are excellent.

Description

Technical Field

[0001] This invention belongs to the field of water-jet drilling technology, and particularly relates to a pry bar assembly and control method for drilling rock cores with water-jet drilling. Background Technology

[0002] Water-cooled drilling rigs are commonly used drilling equipment in geological exploration and construction projects. Efficiently and accurately clamping and retrieving rock cores during drilling has become a technical challenge. Traditional core retrieval methods rely heavily on manual operation, which is not only inefficient but also labor-intensive and poses safety hazards. Therefore, developing a mechanism assembly capable of automatically breaking and clamping rock cores is of great significance for improving the efficiency and safety of drilling operations.

[0003] Traditional methods of extracting core samples from water-cooled drill holes rely heavily on manual operation, resulting in low automation, low work efficiency, and safety hazards, which increases the complexity and labor intensity of the work. Summary of the Invention

[0004] To overcome the problems existing in related technologies, the present invention discloses an assembly of a skid clamping mechanism and a control method for core drilling of water-jet drill holes.

[0005] The technical solution is as follows: A prying and clamping mechanism assembly suitable for drilling rock cores with water-jet drilling includes: a prying and clamping cylinder outer cylinder, which internally houses a piston assembly for providing a reaction force for the clamping action and for driving the prying action by moving. The outer cylinder end cap, located at one end of the outer cylinder of the prying cylinder, uses a wedge-shaped structure on the mating surface with the drill bit to generate concentrated stress and cause the rock core to fracture when prying it off. The intermediate cylinder of the pry bar cylinder is installed inside the outer cylinder of the pry bar cylinder. It is used to guide and support the intermediate piston rod of the hydraulically driven pry bar cylinder and control the gripper pin through movement. The piston rod in the middle of the prying cylinder is driven by the hydraulic system of the water-grinding drill to perform reciprocating motion; the motion simultaneously drives the action of the grippers that pry off the clamping assembly and the movement of the outer cylinder and the end cap of the outer cylinder. Pry open the clamping assembly, including the locking sleeve and two jaws, to achieve the clamping and releasing actions of the jaws; The gripper pin is the pivot point connecting the intermediate cylinder of the prying cylinder and the gripper of the prying clamping assembly, allowing the gripper to rotate around the gripper pin. The jaw opening and closing pin is the pivot point connecting the intermediate piston rod of the prying cylinder and the locking sleeve of the prying clamping assembly. The axial movement of the intermediate piston rod of the prying cylinder drives the jaw opening and closing pin to move along the direction of the keyway opened on one side of the intermediate cylinder of the prying cylinder, thereby moving the locking sleeve and directly controlling the opening and closing of the jaw.

[0006] Furthermore, the axial movement of the gripper opening and closing pin drives the gripper to open and close.

[0007] Furthermore, the hydraulic system of the water-grinding drill includes: A hydraulic pump is used to drive the piston rod in the middle of the skid-clamp cylinder to move by generating pressurized oil. The hydraulic valve includes a directional control valve and a pressure control valve. The hydraulic valve directs pressurized oil to the rodless chamber of the intermediate piston rod of the skid cylinder to push the intermediate piston rod of the skid cylinder to extend, and directs pressurized oil to the rod chamber of the intermediate piston rod of the skid cylinder to push the intermediate piston rod of the skid cylinder to retract, or is in the neutral position, directly controlling the movement direction of the intermediate piston rod of the skid cylinder. The directional control valve controls the direction of the pressurized oil flow; Pressure control valves are used to protect system components from damage caused by excessive pressure. A hydraulic cylinder is used to drive the movement of the piston rod in the middle of the pry bar cylinder.

[0008] Furthermore, one end of the intermediate piston rod of the pry bar cylinder is connected to the piston of the hydraulic cylinder, and the other end is connected to the intermediate cylinder of the pry bar cylinder. The intermediate piston rod of the pry bar cylinder is the physical interface between the hydraulic system and the mechanical part of the pry bar mechanism assembly. It bears the hydraulic thrust and tension, performs linear motion, and directly transmits it to the intermediate cylinder of the pry bar cylinder.

[0009] Another object of the present invention is to provide a prying clamp adjustment method for a prying clamp mechanism assembly, the method being used to adjust the prying clamp mechanism assembly suitable for core drilling with a water-jet drill, the method comprising: S1, through adaptive adjustment and correction of the jaw opening, in the process of preparing for core sampling after the completion of drilling in stage 1, ensures that the opening state of the jaws in the annular gap between the rock core and the borehole wall can meet the clamping requirements of rock cores with different shapes and material properties. S2, by correcting the clamping force of the single-sided clamping jaw under static conditions, correcting the clamping force of the single-sided clamping jaw under dynamic load under dynamic working conditions, and correcting the clamping contact stress, satisfies the clamping state of the jaw during the clamping process in the stage 2 clamping jaw closure and core clamping process, and in the stage 3 core prying process. S3. After completing the core breaking process in stage 3, proceed to the reset and core extraction process in stage 4. The grippers rotate and open to release the core segment; the core segment is then removed from the borehole opening to complete the work cycle.

[0010] In step S1, the adaptive adjustment correction formula for the gripper opening satisfies: ; In the formula, This refers to the gripper opening adjustment range, in meters (m). The diameter of the rock core. The angle of the gripper contact surface is 90°-120°. This is the core shape correction factor. Used for non-ideal cylindrical rock cores, default It is a standard cylinder; The clearance between the gripper and the core is 2mm-5mm. For safety margin coefficient, The adjustment is made dynamically based on the core's brittleness or clamping force requirements.

[0011] In step S2, correcting the clamping force of one side of the gripper under static conditions includes: By using an improved formula for calculating the static gripper clamping force, the clamping force of a single-sided gripper under static conditions is corrected to obtain the actual clamping force required by a single-sided gripper under the influence of multiple factors. The improved formula for calculating the static gripper clamping force satisfies: ; In the formula, The clamping force required for a single-sided gripper; For the weight of the rock core, , This refers to the core mass, expressed in kg. It is the acceleration due to gravity; This is the material deformation compensation coefficient, with a value ranging from 0.8 to 1.2; The friction coefficient between the gripper and the core surface is 0.15-0.25 for steel-rock surfaces. The number of grippers is 2-4 sets; The contact area efficiency factor has a value of 0.6-1.0. The angle of inclination of the gripper contact surface.

[0012] In step S2, the correction of the clamping force of the single-sided gripper under dynamic load under dynamic working conditions includes: An improved dynamic load correction formula is used to correct the clamping force of the single-sided gripper under dynamic load conditions, thereby obtaining the actual clamping force required for the single-sided gripper under dynamic conditions. The improved dynamic load correction formula satisfies the following: ; In the formula, This refers to the clamping force of the single-sided gripper under dynamic working conditions. The clamping safety factor is set between 1.5 and 3.0. The contact surface shape correction factor is 0.8-1.2 for conical surfaces and 1.0 for flat surfaces. This refers to the effective contact length of the gripper on one side.

[0013] In step S2, the clamping contact stress verification and correction includes: the clamping contact stress verification and correction formula for the gripper is: ; In the formula, The maximum compressive stress at the contact surface. The angle between the gripper and the contact surface of the rock core. This is the dynamic load factor, used to account for the effects of vibration, impact, or speed during the clamping process, and its value ranges from 1.2 to 2.0. The diameter of the rock core. This represents the allowable compressive stress of the rock core material.

[0014] Furthermore, the method is mounted on a computer-readable storage medium storing a computer program, which, when executed by a processor, can implement the steps in the various method embodiments described above.

[0015] Combining all the above technical solutions, the beneficial effects of this invention are as follows: First, this invention, installed on a water-powered drilling rig and driven by its hydraulic system, improves the automation level of the operation, saves manpower, reduces labor intensity, and increases work efficiency. Manual core extraction requires close proximity to the borehole, which is susceptible to risks such as sudden core breakage, drilling rig vibration, or borehole collapse. This invention remotely controls the integrated "clamping-prying" action via a hydraulic system, eliminating the need for the operator to contact the core at the bottom of the borehole. In deep boreholes greater than 30 meters or in easily collapsible strata such as sandy soil, manual operation is unsafe. This invention allows for remote core extraction, reducing the risk of falls and injuries, and automating the entire process, saving manpower, reducing labor intensity, and improving work efficiency and safety.

[0016] Secondly, traditional manual operation requires clamping and then prying with different tools, taking approximately 5-10 minutes; the single-action process of this invention takes only 1-2 minutes, is simple to operate, requires no complicated steps, and improves efficiency by over 300%. In urban geological exploration, where intensive sampling is required, the automated process can shorten the operation time per borehole. Real-time monitoring of vibration data via embedded sensors dynamically adjusts the safety factor to prevent core slippage or crushing. In areas with interbedded hard and soft rock, the system automatically identifies the lithology and adjusts parameters, significantly improving core integrity and ensuring reliability in complex working conditions.

[0017] Third, the grippers are connected to the intermediate cylinder via pins, and the detachable design supports different gripper specifications to accommodate rock cores of different diameters. It directly utilizes the existing hydraulic system of the water-jet drilling rig for power, requiring no additional power source. In high-altitude areas where equipment transportation is difficult, this invention only needs to carry a lightweight gripper component replacement kit to meet multi-diameter sampling needs, reducing spare parts costs. The modular structure design offers excellent compatibility and maintainability. This invention uses pneumatic or electric devices instead of hydraulic devices, generating prying force through compressed air driving cylinders or through a motor, making it suitable for scenarios with lower prying force requirements.

[0018] Fourth, this invention directly reduces costs: it optimizes both equipment and labor costs. The invention employs a lightweight gripper component replacement kit design, eliminating the need to carry a complete set of heavy spare parts. Only the gripper module needs to be replaced according to different core diameters, reducing spare parts transportation costs by over 60% and significantly lowering the spare parts inventory and procurement costs for construction companies. Traditional manual coring requires 2-3 people working together. This invention automates the entire "clamping-breaking-coring" process through hydraulic remote control, requiring only one person to operate the control system per borehole, reducing labor costs by 50%-66% and avoiding the risk of workplace injuries associated with manual operation.

[0019] Fifth, the efficiency improvement of this invention: The work cycle is shortened, and project capacity is increased. Traditional manual coring takes 5-10 minutes per process, while this invention, through its integrated "clamping-prying" design, only takes 1-2 minutes per action, improving efficiency by over 300%. Taking urban geological exploration as an example, the average daily sampling frequency per hole can be increased from the traditional 50-60 times to 150-180 times, shortening the project duration by 40%-50%. This invention directly reuses the existing hydraulic system of water-grinding drills, eliminating the need for additional power sources. The equipment modification cycle is short, and the modular structure offers strong compatibility, adapting to over 80% of water-grinding drill models on the market. This avoids the cost of replacing the entire machine due to incompatibility, improving the reuse rate and capacity of existing equipment. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure; Figure 1 This is a schematic diagram of a prying and clamping mechanism assembly for drilling rock cores using a water-jet drill, provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the outer cylinder of the pry-clamp cylinder provided in an embodiment of the present invention; Figure 3 This is a side view of the outer cylinder end cap provided in an embodiment of the present invention; Figure 4 This is a front view of the outer cylinder end cap provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the intermediate cylinder of the skid-clamping cylinder provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the intermediate piston rod of the pry-clamp cylinder provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the pry-off clamping assembly provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the gripper pin provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the gripper opening and closing pin provided in an embodiment of the present invention; Figure 10 This is a flowchart of the prying clamp control method for the prying clamp mechanism assembly provided in the embodiments of the present invention; In the diagram: 1. Outer cylinder of the prying clamping cylinder; 2. Outer cylinder end cap; 3. Middle cylinder of the prying clamping cylinder; 4. Middle piston rod of the prying clamping cylinder; 5. Pry off the clamping assembly; 501. Locking sleeve; 502. Clamping jaw; 6. Clamping jaw pin; 7. Clamping jaw opening and closing pin. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] To address the problems of traditional water-grinding drill core clamping, such as reliance on manual labor, low efficiency, difficulty in adapting to complex working conditions, and inconvenience in high-altitude transportation, this invention proposes a prying and clamping mechanism assembly suitable for water-grinding drill cores. The innovation of this invention lies in its innovative design of an integrated hydraulic linkage structure of "clamping-prying". With the middle piston rod 4 of the prying cylinder as the core driving component, its reciprocating motion can simultaneously drive the middle cylinder 3 of the prying cylinder and the jaw pin 6, realizing the rotational opening and closing of the jaw 502 to clamp the core. At the same time, it drives the outer cylinder 1 of the prying cylinder and the wedge-shaped end cap to move. Through the wedge-shaped structure of the end cap, concentrated stress is generated at the root of the core to complete the prying, without the need for multiple steps or multiple equipment switching. It directly reuses the existing hydraulic system of the water-powered drilling rig, using the piston rod as the physical interface between the hydraulic and mechanical parts, eliminating the need for an additional power source and reducing equipment modification and energy consumption costs. It adopts a modular pry-off clamping assembly 5, with the jaws 502 detachably connected to the intermediate cylinder via jaw pins 6. With the addition of a lightweight jaw 502 replacement kit, it can meet the sampling needs of multiple diameters, adapt to high-altitude transportation scenarios, and reduce spare parts costs. The self-locking design of the jaw 502's wrapping angle and locking sleeve 501, combined with the wedge-shaped end cap structure, can adapt to non-ideal rock core and deep hole and easily collapsed strata operations, improving clamping stability and operational safety, and effectively solving the pain points of traditional technologies.

[0023] Example 1, such as Figures 1-7 As shown, the prying and clamping mechanism assembly for water-jet drilling rock cores provided in this embodiment of the invention includes: a prying and clamping cylinder outer cylinder 1, an outer cylinder end cap 2, a prying and clamping cylinder intermediate cylinder 3, a prying and clamping cylinder intermediate piston rod 4, a prying and clamping assembly 5, a clamping claw pin 6, and a clamping claw opening and closing pin 7. Among them, such as Figure 2 As shown, the outer cylinder 1 of the prying cylinder is the main structure, which houses the piston assembly inside, providing the reaction force for the clamping action, and its movement drives the prying action. Figures 3-4 As shown, the outer cylinder end cap 2 is located at one end of the outer cylinder 1 of the prying cylinder. The mating surface with the drill bit adopts a wedge structure, which generates concentrated stress when pryed off, causing the rock core to fracture. like Figure 5 As shown, the intermediate cylinder 3 of the pry bar cylinder is installed inside the outer cylinder 1 of the pry bar cylinder. It is the guide and support structure of the hydraulically driven intermediate piston rod 4 of the pry bar cylinder. The end of the cylinder has a hole and is connected to the jaw 502 through the jaw pin 6. The keyway on one side of the cylinder allows the jaw opening and closing pin 7 to move axially in the keyway through the drive of the intermediate piston rod 4 of the pry bar cylinder, thereby driving the locking sleeve 501 to move and directly controlling the clamping and releasing action of the jaw 502. like Figure 6 As shown, the piston rod 4 in the middle of the pry bar cylinder is the core driving component, driven by the hydraulic system of the water-grinding drill to perform reciprocating motion. Its motion simultaneously drives the action of the gripper 502 of the pry bar clamping assembly 5 and the movement of the outer cylinder 1 and the outer cylinder end cap 2 of the pry bar cylinder; like Figure 7 As shown, the pry-off clamping assembly 5 includes a locking sleeve 501 and two jaws 502. The locking sleeve 501 is connected to the jaw opening and closing pin 7 to realize the clamping and releasing actions of the jaws 502. like Figure 8 As shown, the gripper pin 6 is the pivot point connecting the intermediate cylinder 3 of the prying cylinder and the gripper 502 of the prying clamping assembly 5, so that the gripper 502 can rotate around the gripper pin 6.

[0024] like Figure 9 As shown, the gripper opening and closing pin 7 is the pivot point connecting the intermediate piston rod 4 of the prying cylinder and the locking sleeve 501 of the prying clamping assembly 5. The axial movement of the piston rod 4 drives the gripper opening and closing pin 7 to move along the keyway direction on one side of the intermediate cylinder 3, thereby moving the locking sleeve 501 and directly controlling the opening and closing action of the gripper 502. The specific workflow of the prying mechanism assembly: Once the water-cooled drilling rig has completed drilling to the predetermined depth and formed a cylindrical rock core, the rig stops rotating and feeding, and the drill bit remains at the root of the rock core at the bottom of the hole. The prying mechanism assembly is located at the bottom of the hole along with the drill rod or drill bit, and the outer cylinder end cap 2 ( Figures 3-4 The wedge-shaped surface of the clamping assembly 5 is placed close to the root of the core or inserted into a tiny gap at the root of the core to pry off the clamping claw 502. Figure 7 It opens up and is located in the annular gap around the core. The operator, through the water-powered drilling rig control system, directs the flow of power into the intermediate cylinder 3 connected to the skid clamp cylinder. Figure 5 The hydraulic circuit supplies oil, and the hydraulic oil drives the intermediate piston rod 4 of the skid-clamp cylinder. Figure 6 This causes axial movement, and the piston rod 4 in the middle of the pry bar cylinder retracts to clamp. The intermediate piston rod 4 of the pry bar cylinder ( Figure 6) and the jaw opening and closing pin 7 ( Figure 9 ) connection, the retraction of the piston rod 4 in the middle of the prying cylinder drives the opening and closing of the jaws and the pin shaft 7 ( Figure 9 Simultaneously retract inward; Clamp opening and closing pin 7 ( Figure 9 The retraction of ) drives the locking sleeve 501 fixed thereon ( Figure 7 ) moves inward, the gripper opens and closes pin 7 ( Figure 9 The axial movement of the locking sleeve 501 causes the locking sleeve to move axially. Figure 7 ) moves axially, while gripper 502 ( Figure 7 ) around the gripper pin 6 ( Figure 8 ) rotates, causing the two grippers 502 ( Figure 7 The grippers 502 ( ) retract inwards and close. Figure 7 Firmly hold the core column at the bottom of the borehole; The hydraulic system continuously supplies oil, and the intermediate piston rod 4 of the skid cylinder ( Figure 6 ) and the jaw opening and closing pin 7 fixed to it ( Figure 9 Continue to retract inward; At this time, gripper 502 ( Figure 7 The core has been firmly held in place. Due to the core being confined by the borehole wall, the clamp 502 ( Figure 7 Unable to move further inward, locking sleeve 501 ( Figure 7 ) and gripper 502 ( Figure 7 The design of the gripper itself creates a self-locking effect, preventing the gripper 502 ( Figure 7 ) is released under the resistance of the rock core, when the piston rod 4 in the middle of the prying cylinder ( Figure 6 ) and gripper opening and closing pin 7 ( Figure 9 The gripper 502 continued to retract, while the gripper... Figure 7 When the gripping of the rock core is obstructed, the piston rod 4 in the middle of the prying cylinder and the opening and closing pin 7 of the gripper ( Figure 9 The retraction force will be transmitted to the outer cylinder 1 of the pry bar cylinder. Figure 2 This force will drive the outer cylinder 1 of the pry bar cylinder. Figure 2 ) relative to the clamping claw 502 that holds the rock core Figure 7 ) and gripper opening and closing pin 7 ( Figure 9 Move towards the bottom of the hole; Skid clamp cylinder outer cylinder 1 ( Figure 2 The outward movement of the outer cylinder end cap 2 (fixed at its end) drives the outer cylinder end cap 2 ( Figures 3-4 ) moves outward synchronously, outer cylinder end cap 2 ( Figures 3-4 The wedge-shaped structure relative to the stationary drill bit and the core root held by the chuck 502 generates an outward, inclined compressive force. This wedge-shaped compressive force generates extremely high concentrated stress in a very small area at the core root. When this stress exceeds the bending or shear strength of the core, the core undergoes brittle fracture at the root.

[0025] After the core sample is broken, the operator switches the hydraulic valve, and the piston rod 4 in the middle of the pry cylinder ( Figure 6 ) Extends to drive the jaws to open and close the pin shaft 7 ( Figure 9 Simultaneous extension; Clamp opening and closing pin 7 ( Figure 9 ) Extends to drive the locking sleeve 501 ( Figure 7 ) moves outward, locking sleeve 501 ( Figure 7 The axial movement of the gripper 502 causes it to rotate around the pin ( Figure 8 The cylinder rotates in the opposite direction, opening and releasing the broken rock core segment. Simultaneously, under hydraulic balance and gravity, the outer cylinder 1 of the prying cylinder... Figure 2 ) and outer cylinder end cap 2 ( Figures 3-4 It also moves or resets to its initial position; The water-cooled drilling rig lifts the drill rod, and the entire drilling tool (including the drill bit, the prying mechanism assembly, and the pryed-off core section) is pulled out of the borehole. The core section is removed at the borehole opening.

[0026] For example, the core components of the hydraulic system of a water-grinding drill include: Hydraulic pump: The engine of the water-grinding drill drives the hydraulic pump, which converts mechanical energy into hydraulic energy, providing the pressure oil source and flow required by the system. It is the starting point of the entire hydraulic power system, and the pressure oil generated drives the intermediate piston rod 4 of the skid-clamp cylinder. Figure 6 The original driving force for movement.

[0027] Hydraulic valves: The most critical control hub in the system, including directional control valves and pressure control valves. Directional control valves are typically three-position four-way directional valves that receive operator commands and precisely control the flow of pressurized oil. The hydraulic valves determine whether pressurized oil flows to the rodless chamber of the intermediate piston rod 4 in the skid cylinder to extend it, or to the rod chamber to retract it, or remains in the neutral position, directly controlling the direction of movement of the intermediate piston rod 4.

[0028] Pressure control valve (relief valve): Sets the maximum working pressure of the system and protects system components from damage by excessive pressure. During the prying stage, when the core resistance is high, the pressure will rise, and the relief valve ensures that the pressure does not exceed the safe value.

[0029] Hydraulic cylinder: An actuator that drives the intermediate piston rod 4 of the skid cylinder to move. Pressurized oil enters the rodless or rod chamber of the hydraulic cylinder, pushing the piston and the connected intermediate piston rod 4 of the skid cylinder. Figure 6 It makes linear motion, which directly corresponds to the core action of the prying mechanism assembly.

[0030] For example, the intermediate piston rod 4 of the pry-clamp cylinder ( Figure 6): The output rod of the hydraulic cylinder, which is also the core transmission component inside the pry bar mechanism assembly. (The pry bar cylinder intermediate piston rod 4) Figure 6 One end is connected to the piston of the hydraulic cylinder, and the other end is connected to the intermediate cylinder 3 of the skid clamp cylinder. Figure 5 On the upper part, it is the physical interface between the hydraulic system and the mechanical parts of the prying mechanism assembly. As part of the hydraulic cylinder, it bears the hydraulic thrust and pull, and performs linear motion. As part of the prying mechanism, its linear motion is directly transmitted to the intermediate cylinder 3 of the prying cylinder. Figure 5 ).

[0031] Example 2, as Figure 9 As shown, the prying adjustment method for the prying mechanism assembly provided in this embodiment of the invention includes: S1, through adaptive adjustment and correction of the jaw opening, in the process of preparing for core sampling after the completion of drilling in stage 1, ensures that the opening state of the jaws in the annular gap between the rock core and the borehole wall can meet the clamping requirements of rock cores with different shapes and material properties. S2, by correcting the clamping force of the single-sided clamping jaw under static conditions, correcting the clamping force of the single-sided clamping jaw under dynamic load under dynamic working conditions, and correcting the clamping contact stress, satisfies the clamping state of the jaw during the clamping process in the stage 2 clamping jaw closure and core clamping process, and in the stage 3 core prying process. S3. After completing the core breaking process in stage 3, the core resetting and core extraction process in stage 4 is carried out. The gripper 502 rotates and opens to release the core segment; the core segment is then removed from the borehole to complete the operation cycle.

[0032] For example, in step S1, Typical formula for adaptive adjustment of gripper opening: According to the gripper opening formula: ; In the formula, This refers to the gripper opening adjustment range, in meters (m). The diameter of the rock core. The gripper has a corner angle of 90°-120°. The clearance between the gripper and the core is 2mm-5mm. Actual rock cores may have irregular shapes. A core shape correction coefficient is introduced, and shape deviations are quantified using experimental or simulation data to avoid clamping failure caused by insufficient jaw opening. Simultaneously, the clearance margin is upgraded from a fixed value to an adjustable parameter. For example, when clamping highly brittle shale, the dynamic safety margin is increased to reduce contact stress; when clamping hard granite, the dynamic safety margin is decreased to improve contact stability. For rock cores of different diameters, the adaptive adjustment correction formula for the jaw opening must satisfy the following: ; In the formula, This refers to the gripper opening adjustment range, in meters (m). The diameter of the rock core. The gripper has a corner angle of 90°-120°. This is the core shape correction factor. Used for non-ideal cylindrical rock cores (such as those with uneven or elliptical surfaces), default. It is a standard cylinder; The clearance between the gripper and the core is 2mm-5mm. For safety margin coefficient, The selection process is dynamically adjusted based on the core's brittleness or the required clamping force (e.g., for fragile core samples). ).

[0033] Step S2, correcting the clamping force of one side of the gripper under static conditions includes: The clamping force of a single-sided gripper under static conditions is corrected by using an improved static gripper clamping force calculation formula to obtain the actual clamping force required by a single-sided gripper under the influence of multiple factors. For example, the formula for calculating the clamping force of a single-sided gripper under typical static conditions is as follows: ; A new material deformation compensation coefficient is added to characterize the effect of elastic deformation of the gripper or workpiece on the clamping force, avoiding insufficient clamping force or overload due to material elasticity; a contact area efficiency factor is introduced to correct the effect of actual contact area on friction; the effect of gripper geometry on normal force is quantified by the gripper contact surface inclination angle; the safety factor is extended from a fixed value to a function related to working conditions (such as temperature and humidity changes), and is adjusted in real time through embedded sensors to improve adaptability.

[0034] The improved formula for calculating the static gripper clamping force satisfies: ; In the formula, This represents the clamping force required for one side of the gripper, expressed in Newtons (N). This represents the weight of the rock core, expressed in Newton-hours (N). , This refers to the core mass, expressed in kg. It is the acceleration due to gravity; The material deformation compensation coefficient, with a value of 0.8-1.2, is determined by the ratio of the elastic modulus of the gripper to that of the object being gripped. The friction coefficient between the gripper and the core surface is 0.15-0.25 for steel-rock surfaces. The number of grippers is 2-4 sets; The contact area efficiency factor, ranging from 0.6 to 1.0, reflects the difference between the actual contact area and the theoretical value. For safety margin coefficient, Adjust according to the intensity of construction vibration; In step S2, the correction of the clamping force of the single-sided gripper under dynamic load under dynamic working conditions includes: The clamping force of the single-sided gripper under dynamic load is corrected by using an improved dynamic load correction formula, so as to obtain the actual clamping force required for the single-sided gripper under dynamic load. For example, the formula for the clamping force of a single-sided gripper under dynamic load under typical dynamic operating conditions is: ; In the formula, This represents the clamping force required for one side of the gripper, expressed in Newtons (N). This is the dynamic load factor, ranging from 1.2 to 2.0, adjusted based on measured vibration acceleration or empirical values.

[0035] By introducing a contact length parameter, the constraint effect of the gripper structure on force distribution is quantified. A shape correction coefficient is used to accommodate the geometric characteristics of different gripper ends. Simultaneously, a product relationship between the safety factor and the friction coefficient is established to strengthen engineering reliability design criteria. The improved dynamic load correction formula must satisfy the following: ; In the formula, The clamping force of the single-sided gripper under dynamic working conditions is expressed in N. The clamping safety factor, ranging from 1.5 to 3.0, characterizes the system redundancy. The contact surface shape correction factor is 0.8-1.2 for conical surfaces and 1.0 for flat surfaces. This represents the effective contact length of a single-sided gripper, expressed in meters (m).

[0036] In step S2, the correction of the gripper's clamping contact stress includes: For loads that are typically static, the formula for clamping contact stress is as follows: ; Added dynamic load factor Quantifying dynamic effects makes the verification more closely resemble engineering practice. The original formula assumes a static load, but vibrations or impacts may occur during actual clamping (such as during drilling machinery operations). To avoid localized core crushing, the modified formula for verifying the clamping contact stress is as follows: ; In the formula, This represents the maximum compressive stress at the contact surface, expressed in MPa. The angle between the gripper and the contact surface of the rock core is expressed in degrees (°). This is the dynamic load factor, used to account for the effects of vibration, impact, or velocity during the clamping process, and its value ranges from 1.2 to 2.0. The specific value is determined by operating condition experiments; The core diameter is in meters (m). This is the allowable compressive stress for the core material, such as 10-20 MPa for sandstone.

[0037] For example, the prying control method for the prying mechanism assembly provided in this embodiment of the invention, namely, the method of controlling the prying mechanism assembly using a hydraulic system, includes: Phase 1: Drilling completed, ready for core extraction.

[0038] The water-cooled drilling rig completes drilling, forming a cylindrical rock core. The drill bit stops rotating and remains at the root of the rock core at the bottom of the hole. The chuck mechanism is lowered to the bottom of the hole along with the drill rod, and the outer cylinder end cap 2 ( Figures 3-4 The wedge-shaped surface of the clamp is tightly attached to the root of the core or inserted into the gap, and the clamp 502 ( Figure 7 The core is in the open state, located in the annular gap between the core and the borehole wall. The hydraulic pump continuously outputs pressurized oil, the directional control valve is in the neutral position, the pressurized oil returns to the oil tank or is closed, there is no oil pressure in the two chambers of the hydraulic cylinder, and the piston rod 4 in the middle of the pry cylinder is in the open state. Figure 6 )still.

[0039] Stage 2: The grippers close, clamping the rock core.

[0040] The hydraulic drive starts, and the operator switches the direction control valve to the "clamp / pry" position. Pressurized oil enters the rod chamber of the hydraulic cylinder, while the oil in the rodless chamber flows back to the oil tank via a valve. Figure 6 ) retracts into the cylinder, prying and clamping the piston rod 4 in the middle of the cylinder. Figure 6 One end is connected to the hydraulic cylinder piston, and the other end is linked to the gripper opening and closing pin 7 ( Figure 9 ) retract inwards synchronously, prying open the intermediate cylinder 3 ( Figure 5 ) via the gripper pin 6 ( Figure 8 ) drives the gripper 502 ( Figure 7 ) around the gripper pin 6 ( Figure 8 Rotation; At the same time, the piston rod 4 in the middle of the pry bar cylinder ( Figure 6 ) Drive gripper opening and closing pin 7 ( Figure 9 ), along the middle cylinder 3 of the skid clamp cylinder ( Figure 5 The keyway on one side moves axially, thereby driving the locking sleeve 501 ( Figure 7 Synchronous displacement; Gripper 502 ( Figure 7 Under the dual action of "pin rotation + locking sleeve guidance", it retracts inward until it tightly hugs the rock core. At this time, the locking sleeve 501 ( Figure 7 This triggers the self-locking effect, preventing the grippers from loosening due to the reaction force of the rock core, and completing the clamping action.

[0041] Phase 3: Core breaking. Hydraulic pressure is continuously supplied, the directional valve maintains the working position, and the hydraulic pump continuously supplies oil to the rod chamber. The system pressure increases due to core resistance, and the relief valve limits the maximum pressure. Only after the clamping pressure reaches the target can the prying stage be allowed. The prying cylinder's intermediate piston rod 4 ( Figure 6 ) and the jaw opening and closing pin 7 ( Figure 9 ) continues to retract, and the retraction force passes through the intermediate piston rod 4 of the pry bar cylinder. Figure 6 ) is transferred to the outer cylinder 1 of the skid clamp cylinder ( Figure 2 ), drive the outer cylinder 1 of the pry bar cylinder to move towards the bottom of the hole, and the outer cylinder 1 of the pry bar cylinder pushes the outer cylinder end cap 2 ( Figures 3-4 The wedge-shaped surface of the rock core compresses the root of the rock core, and the wedge structure generates concentrated stress at the root of the rock core. When the stress exceeds the bending strength of the rock core, the rock core fractures brittlely.

[0042] Phase 4: Reset and Core Removal.

[0043] Hydraulic switching reset: The operator switches the directional valve to the "Release / Reset" position. Pressurized oil enters the rodless chamber of the hydraulic cylinder, while the oil in the rod chamber returns to the oil tank. The hydraulic pressure in the rodless chamber pushes the piston, which in turn drives the intermediate piston rod 4 of the skid cylinder. Figure 6 ) Extend outwards, and the linkage jaws open and close the pin 7 ( Figure 9 They move outwards in sync; Clamp opening and closing pin 7 ( Figure 9 ) drives the locking sleeve 501 ( Figure 7 Displacement, release self-locking state, gripper 502 ( Figure 7 ) around the gripper pin 6 ( Figure 8 The reverse rotation opens the cylinder, releasing the broken core segment; the outer cylinder 1 of the pry bar cylinder ( Figure 2 ) and outer cylinder end cap 2 ( Figures 3-4 Return to the initial position, the water-powered drilling rig lifts the drill rod, bringing out the drill bit, prying mechanism, and core section. The core section is then removed from the borehole, completing the work cycle.

[0044] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0045] To further illustrate the effects of the embodiments of the present invention, the following experiments were conducted: I. Basic Experimental Information 1.1 Experimental Objective: To verify the performance of this invention in improving operational efficiency, adaptability to high-risk scenarios, and ensuring core integrity, and to clarify its technical advantages over traditional manual coring.

[0046] 1.2 Experimental Subjects and Grouping

[0047] 1.3 Experimental Environment and Parameters Drilling conditions: shallow hole (Φ100mm×10m), deep hole (Φ100mm×30m), simulated geological scene includes 3 types of typical lithology: (1) hard rock: granite (compressive strength 100-120MPa, elastic modulus 60GPa); (2) brittle soft rock: shale (compressive strength 20-30MPa, elastic modulus 15GPa); (3) complex lithology: sandstone and mudstone interbedded (bedding spacing 5-10cm, compressive strength 30-50MPa); Experimental repeatability: Each experiment was repeated 3 times, and the average value was taken to reduce error.

[0048] II. Experimental Design and Results Analysis 2.1 Comparison Experiment of Work Efficiency 2.1.1 Experimental Design Test metric: Single-cycle core sampling time; Variable control: same water-cooled drilling machine, same operator, same borehole diameter (Φ100mm); Scene division: shallow hole (10m), deep hole (30m).

[0049] 2.1.2 Experimental Results

[0050] 2.1.3 Results Analysis Existing technologies, both domestically and internationally, suffer from functional fragmentation in their solutions for water-jet drilling core processing: either they can only achieve single clamping, or only single prying; no integrated structure has yet emerged that synchronously controls both jaw clamping and end cap prying via a single hydraulic drive source. This invention, through a hydraulically linked "clamping-prying" integrated action, completely eliminates the redundant steps of "repeatedly adjusting the clamps and multiple people cooperating in prying" in traditional methods, improving shallow hole efficiency by 380%. Furthermore, in 30m deep hole scenarios, traditional methods are completely ineffective due to safety and operational limitations, while this invention achieves stable core extraction through remote control. This invention, through the linkage design of "prying cylinder intermediate piston rod 4 - intermediate cylinder - jaw pin shaft," simultaneously transforms the linear motion of the hydraulic system into two actions: "jaw closing clamping" and "outer cylinder end cap 2 wedge-shaped extrusion prying," achieving seamless "clamping-prying" connection and solving the pain points of multiple equipment switching and multi-step operations in traditional technologies.

[0051] The industry has long sought to solve the problem of processing multi-diameter rock cores without carrying multiple sets of heavy equipment. Traditional techniques require different specifications of clamping and prying equipment for different diameter cores, each set weighing 15-30 kg. In areas with difficult transportation, such as plateaus and mountains, construction teams need to carry multiple sets of equipment, resulting in high transportation costs and cumbersome on-site replacements. Previous attempts at "adjustable grippers" have mostly involved threaded adjustments, resulting in a narrow adjustment range and time-consuming adjustments, failing to meet the demands of efficient operation. This invention utilizes a "modular gripper + pin quick connection" design: the grippers and the intermediate cylinder are detachably connected via gripper pins 6. Changing between different gripper specifications takes only 2-3 minutes, and a single gripper set weighs only 1.5-3 kg, completely resolving the contradiction between multi-diameter compatibility and lightweight transportation.

[0052] 2.2 Safety Verification Experiment 2.2.1 Experimental Design; Test indicators: safe distance between operator and borehole, incidence of risk events during coring; Risk scenario simulation: A sand layer is set at the bottom of the deep hole (30m) to simulate the "sudden fracture of the core" in shale core sampling; Data recording: Record the operation distance and the number of risk events for each group of experiments (repeated 3 times).

[0053] 2.2.2 Experimental Results:

[0054] 2.2.3 Results Analysis Traditional manual coring requires close contact with the borehole opening, which can easily lead to falls or injuries due to sudden core breakage or borehole wall collapse. This invention uses hydraulic remote control and a "clamping-prying" self-locking design (locking sleeve 501 prevents the grippers from loosening) to increase the operating distance to a safe range. Furthermore, the dynamic load correction formula adjusts the clamping force in real time through a vibration sensor to prevent core slippage and achieve zero-risk operation.

[0055] The industry has long sought to solve the problem of safe coring in deep boreholes and easily collapsible strata: traditional manual coring requires operators to be close to the borehole opening, and even to lower tools, which is prone to accidents such as falls and injuries due to sudden core breakage or borehole wall collapse; moreover, visibility is obstructed in deep boreholes, making it impossible for operators to assess the core condition, resulting in a coring success rate of less than 50%. Previous attempts at "robotic arm-assisted coring" failed due to the narrow space in deep boreholes and the lack of flexibility of robotic arms; "vacuum adsorption coring" was also tried, but dust in easily collapsible strata would clog the adsorption channels, leading to extremely low reliability. This invention, through a "hydraulic remote control + wedge-shaped concentrated stress prying" design, allows operators to control actions via hydraulic valves without approaching the borehole opening; the two wedge-shaped structures on the outer cylinder end cap generate concentrated stress with only a tiny gap, eliminating the need for complex operations inside the borehole, successfully achieving safe coring in deep boreholes and easily collapsible strata, increasing the coring success rate to over 98%.

[0056] The industry has long sought to solve the problem of low core integrity in hard-soft rock interbedded areas: In these areas, the significant differences in rock hardness make traditional fixed clamping force designs prone to causing soft rock crushing and hard rock slippage, resulting in a core integrity rate of only 60%-70%, which fails to meet the geological exploration requirement of core continuity. Previous attempts included "graded clamping force control," but this required manual assessment of lithology and adjustment of parameters beforehand, which was impossible in real-time at deep boreholes, leading to adjustment lags. "Elastic grippers" were also tried, but their limited elastic deformation range could not adapt to cores with large hardness differences. This invention utilizes "dynamic load correction + contact stress verification": embedded sensors monitor vibration data in real-time, reflecting lithological hardness, and automatically adjust the dynamic load coefficient and clamping force to ensure that soft rock does not crush and hard rock does not slip, increasing the core integrity rate to over 90%.

[0057] 2.3 Comparison Experiment of Core Integrity 2.3.1 Experimental Design Test index: Core integrity rate; Control methods: The experimental group adopted the "adaptive correction of gripper opening + dynamic and static clamping force correction + contact stress verification" of the present invention, while the control group adjusted the clamping force manually based on experience. The present invention innovatively proposes a "three-layer adaptive correction system": ① Adaptive gripper opening: introducing a core shape correction coefficient and dynamic adjustment of safety margin; ② Dual-dimensional correction of clamping force: considering material deformation compensation and contact area efficiency in static working conditions, and introducing a dynamic load coefficient in dynamic working conditions; ③ Contact stress verification: combining the dynamic load coefficient and the allowable compressive stress of the core to achieve precise adaptation to cores of different shapes, materials and working conditions.

[0058] Lithological variables: granite (hard rock), shale (brittle soft rock), and interbedded sandstone and mudstone (complex lithology).

[0059] 2.3.2 Experimental Results

[0060] 2.3.3 Results Analysis Traditional manual coring suffers from uncontrollable clamping force and concentrated prying stress. Hard rocks are prone to core breakage due to clamp slippage, while soft rocks are prone to crushing due to excessive clamping force. Complex rock types are even more easily broken due to well-developed bedding. This invention addresses these issues by: Adaptive correction of gripper opening: The opening is dynamically adjusted according to the core diameter and shape to avoid slippage due to excessive looseness or crushing due to excessive tightness; Contact stress verification: Ensure that the clamping stress is less than or equal to the allowable compressive stress of the core, which ultimately improves the core integrity rate by 33%-43%. In addition, traditional methods completely fail in deep hole scenarios, and the experimental group still maintains an integrity rate of 78%.

[0061] There has long been a technical prejudice within the industry that automated coring equipment requires an additional power source and complex transmission structure, inevitably resulting in large size, heavy weight, and high cost. It is believed that water-jet drills, as small to medium-sized equipment, cannot bear the weight and cost of automated mechanisms, thus relying heavily on manual operation. Even with attempts at automation, the 30%-50% increase in equipment weight and 2-3 times the cost have made them unacceptable to construction companies. This invention reuses existing hydraulic systems: no additional power source is needed, utilizing the water-jet drill's built-in hydraulic pump and cylinders, increasing equipment weight by only 5%-8%; the modular and simplified structure: the core transmission only involves a three-stage linkage of "piston rod-intermediate cylinder-pin shaft," without complex gears or cam structures. Manufacturing costs are only 15%-20% higher than traditional manually assisted equipment, but efficiency is increased by 300%, proving that automated coring equipment can be lightweight and low-cost, breaking the industry's prejudice against automated equipment.

[0062] There has long been a technical bias in the industry that core clamping only requires sufficient clamping force to prevent slippage, without considering dynamic working conditions or differences in core shape. Designs often set clamping forces based solely on a fixed multiple of the core's weight, ignoring the impact of dynamic vibration and core shape deviations on clamping effectiveness. This leads to recurring problems in actual operations, such as over-clamping crushing soft rock and insufficient clamping force causing slippage from hard rock. This invention introduces a dynamic load coefficient through a "dynamic load correction formula" to quantify the clamping force requirements of vibration; it adapts to non-ideal cores through a "core shape correction coefficient"; and it avoids over-clamping through "contact stress verification." This demonstrates that core clamping requires precise adaptation rather than brute force, breaking the industry's technical bias that "the greater the clamping force, the better," and driving the upgrade of core processing from experience-based to precision-based methods.

[0063] III. Experimental Summary: This invention, through a "hydraulic linkage mechanism + dynamic control method," achieves the following significant advantages compared to traditional manual coring methods: Leap in efficiency: The shallow hole operation time is reduced from 7.2 minutes to 1.5 minutes, improving efficiency by 380%; in deep hole (≥30m) scenarios, traditional methods are completely ineffective, but this invention can operate stably. Safety upgrade: The operating distance has been increased from 0.5m to over 3m, and the risk incidence rate has been reduced from 75% to 0; Quality assurance: Core integrity rate increased from 35%-62% to 78%-95%, meeting the stringent requirements of geological exploration for core integrity; In summary, this invention is significantly superior to traditional manual coring in terms of both technical performance and economic efficiency, and can meet the needs of efficient, safe, and high-quality coring in the field of geological exploration.

[0064] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention and within the spirit and principles of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A prying and clamping mechanism assembly suitable for core drilling with a water-jet drill, characterized in that, The assembly includes: a pry-clamp cylinder outer cylinder (1) that internally houses a piston assembly for providing a reaction force for the clamping action and for driving the prying action by movement; The outer cylinder end cap (2) is located at one end of the outer cylinder (1) of the prying cylinder. Through the wedge-shaped structure adopted with the mating surface of the drill bit, it is used to generate concentrated stress to break the rock core when prying it off. The intermediate cylinder (3) of the pry bar cylinder is installed inside the outer cylinder (1) of the pry bar cylinder. It is used to guide and support the intermediate piston rod (4) of the hydraulically driven pry bar cylinder and to control the jaw pin (6) by moving it. The piston rod (4) in the middle of the prying cylinder is driven by the hydraulic system of the water mill drill to perform reciprocating motion; the motion simultaneously drives the action of the jaws (502) of the prying clamping assembly (5) and the movement of the outer cylinder (1) and the outer cylinder end cap (2) of the prying cylinder. The prying clamping assembly (5) includes a locking sleeve (501) and two jaws (502) for clamping and releasing actions of the jaws (502); The gripper pin (6) is the pivot point connecting the intermediate cylinder (3) of the prying cylinder and the gripper (502) of the prying clamping assembly (5), so that the gripper (502) can rotate around the gripper pin (6). The gripper opening and closing pin (7) is the pivot point connecting the intermediate piston rod (4) of the prying cylinder and the locking sleeve (501) of the prying clamping assembly (5). The axial movement of the intermediate piston rod (4) of the prying cylinder drives the gripper opening and closing pin (7) to move along the direction of the keyway opened on one side of the intermediate cylinder (3) of the prying cylinder, thereby driving the locking sleeve (501) to move and directly controlling the opening and closing of the gripper (502).

2. The prying and clamping mechanism assembly for core drilling using water-jet drilling as described in claim 1, characterized in that, The axial movement of the gripper opening and closing pin (7) drives the gripper (502) to open and close.

3. The prying and clamping mechanism assembly for core drilling using water-jet drilling as described in claim 1, characterized in that, The hydraulic system of the water-grinding drill includes: A hydraulic pump is used to drive the intermediate piston rod (4) of the skid clamp cylinder to move by generating pressurized oil; The hydraulic valve includes a directional control valve and a pressure control valve. The hydraulic valve directs pressure oil to the rodless chamber of the intermediate piston rod (4) of the pry bar cylinder to push the intermediate piston rod (4) of the pry bar cylinder to extend, and directs pressure oil to the rod chamber of the intermediate piston rod (4) of the pry bar cylinder to push the intermediate piston rod (4) of the pry bar cylinder to retract, or is in the neutral position, directly controlling the movement direction of the intermediate piston rod (4) of the pry bar cylinder. The directional control valve controls the direction of the pressurized oil flow; Pressure control valves are used to protect system components from damage caused by excessive pressure. A hydraulic cylinder is used to drive the piston rod (4) in the middle of the pry bar cylinder to move.

4. The prying and clamping mechanism assembly for core drilling using water-jet drilling as described in claim 3, characterized in that, One end of the piston rod (4) of the prying cylinder is connected to the piston of the hydraulic cylinder, and the other end is connected to the intermediate cylinder (3) of the prying cylinder. The piston rod (4) of the prying cylinder is the physical interface between the hydraulic system and the mechanical part of the prying mechanism assembly. It bears the hydraulic thrust and pull, performs linear motion, and directly transmits the force to the intermediate cylinder (3).

5. A method for adjusting the prying clamp of a prying clamping mechanism assembly, characterized in that, This method is used to control the pry clamping mechanism assembly for core drilling using water-jet drilling as described in any one of claims 1-4, the method comprising: S1, through adaptive adjustment and correction of the jaw opening, in the process of preparing for core sampling after the completion of drilling in stage 1, ensures that the opening state of the jaws in the annular gap between the rock core and the borehole wall can meet the clamping requirements of rock cores with different shapes and material properties. S2, by correcting the clamping force of the single-sided clamping jaw under static conditions, correcting the clamping force of the single-sided clamping jaw under dynamic load under dynamic working conditions, and correcting the clamping contact stress, satisfies the clamping state of the jaw during the clamping process in the stage 2 clamping jaw closure and core clamping process, and in the stage 3 core prying process. S3. After completing the core breaking process in stage 3, the core resetting and core extraction process in stage 4 is carried out. The gripper (502) rotates and opens to release the core segment; the core segment is taken out at the borehole opening to complete the operation cycle.

6. The prying adjustment method for the prying mechanism assembly according to claim 5, characterized in that, In step S1, the adaptive adjustment correction formula for the gripper opening satisfies: In the formula, This refers to the gripper opening adjustment range, in meters (m). The diameter of the rock core. The angle of the gripper contact surface is 90°-120°. This is the core shape correction factor. Used for non-ideal cylindrical rock cores, default It is a standard cylinder; The clearance between the gripper and the core is 2mm-5mm. For safety margin coefficient, The adjustment is made dynamically based on the core's brittleness or clamping force requirements.

7. The prying adjustment method for the prying mechanism assembly according to claim 6, characterized in that, In step S2, correcting the clamping force of one side of the gripper under static conditions includes: By using an improved formula for calculating the static gripper clamping force, the clamping force of a single-sided gripper under static conditions is corrected to obtain the actual clamping force required by a single-sided gripper under the influence of multiple factors. The improved formula for calculating the static gripper clamping force satisfies: In the formula, The clamping force required for a single-sided gripper; For the weight of the rock core, , This refers to the core mass, expressed in kg. It is the acceleration due to gravity; This is the material deformation compensation coefficient, with a value ranging from 0.8 to 1.2; The friction coefficient between the gripper and the core surface is 0.15-0.25 for steel-rock surfaces. The number of grippers is 2-4 sets; The contact area efficiency factor has a value of 0.6-1.

0. The angle of inclination of the gripper contact surface.

8. The prying clamping adjustment method for the prying clamping mechanism assembly according to claim 7, characterized in that, In step S2, the correction of the clamping force of the single-sided gripper under dynamic load under dynamic working conditions includes: An improved dynamic load correction formula is used to correct the clamping force of the single-sided gripper under dynamic load conditions, thereby obtaining the actual clamping force required for the single-sided gripper under dynamic conditions. The improved dynamic load correction formula satisfies the following: In the formula, This refers to the clamping force of the single-sided gripper under dynamic working conditions. The clamping safety factor is set between 1.5 and 3.

0. The contact surface shape correction factor is 0.8-1.2 for conical surfaces and 1.0 for flat surfaces. This refers to the effective contact length of the gripper on one side.

9. The prying clamping adjustment method for the prying clamping mechanism assembly according to claim 8, characterized in that, In step S2, the clamping contact stress verification and correction includes: the clamping contact stress verification and correction formula for the gripper is: In the formula, The maximum compressive stress at the contact surface. The angle between the gripper and the contact surface of the rock core. This is the dynamic load factor, used to account for the effects of vibration, impact, or speed during the clamping process, and its value ranges from 1.2 to 2.

0. The diameter of the rock core. This represents the allowable compressive stress of the rock core material.

10. The prying adjustment method for the prying mechanism assembly according to claim 5, characterized in that, The method is carried on a computer-readable storage medium storing a computer program that, when executed by a processor, can implement the steps in the various method embodiments described above.

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