Novel tong head for drilling platform and using method of novel tong head

Abstract

The invention discloses a novel tong head for a drilling platform and a using method of the novel tong head, and relates to the technical field of drilling equipment, in particular to the novel tong head for the drilling platform and the using method of the novel tong head for the drilling platform. A left gate and a right gate are arranged at an opening of the main bushing and are rotatably arranged on the tong head box body through a pin shaft, one end of the first telescopic device is rotatably arranged on the tong head box body, and the other end of the first telescopic device is arranged as a telescopic end, is arranged at the end parts of the left gate and the right gate and is used for pushing the left gate and the right gate to rotate around the pin shaft; the large door opening and closing device has the advantages that the wrapping performance of the tong head is enhanced, shaking during screwing-on is reduced, the stability and safety of operation are improved, the maintenance efficiency is improved, the automation degree is improved, and the requirement for manual operation is lowered.

Description

Technical Field

[0001] The invention relates to the technical field of drilling equipment, and in particular to a new type of pliers head for a drilling platform and a use method thereof. Background Art

[0002] In traditional oil drilling operations, the connection and removal of pipe stands are two critical and time-consuming steps. In order to improve operational efficiency, the industry has developed an offline system that allows drilling operations to be carried out simultaneously with pipe stand connection and removal operations without occupying the wellhead or using the original traveling hoist system. This offline system uses an additional lifting system to achieve all operations on a single drill pipe and pipe stand, thereby significantly improving overall operational efficiency.

[0003] However, the existing clamp head design mainly follows the design concept of the original elevator, including the elevator body and the left and right doors to bear the load together. This design has several problems: first, since the clamp head door needs to bear a large load, the requirements for its strength and structural safety are very high; second, the clamp head door occupies a large space after opening, which limits its application in narrow spaces; in addition, the lightweight design for weight reduction leads to poor wrapping of the clamp head, which increases the shaking when buckling, affecting the stability of the operation; finally, due to space limitations, the clamp head locking operation is mostly manual, with a low degree of automation, which increases the complexity and risk of operation.

[0004] Therefore, in view of the shortcomings of the prior art, there is an urgent need for an improved new type of tongs head for drilling platforms to solve the above problems and meet the requirements of modern drilling operations for high efficiency, high safety and high automation. Summary of the invention

[0005] The present invention aims to overcome the above-mentioned disadvantages of the prior art and provide a new type of pliers head for a drilling platform and a method of using the same.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A new type of clamp head for a drilling platform comprises: a clamp head box, a main bushing, a left gate, a right gate and a first telescopic device, wherein the main bushing is arranged in the middle of the clamp head box, the left gate and the right gate are arranged at the opening of the main bushing, the left gate and the right gate are rotatably arranged on the clamp head box through a pin shaft, one end of the first telescopic device is rotatably arranged on the clamp head box, and the other end is arranged as a telescopic end and connected to one end of the left gate and the right gate, so as to push the left gate and the right gate to rotate around the pin shaft to realize the opening or closing of the gate.

[0008] Furthermore, the left and right gates are provided with processed stoppers, and the main bushing opening is provided with left and right bushings, and the left and right bushings are installed on the left and right gates through the processed stoppers of the left and right gates.

[0009] Furthermore, it comprises a limiting upward movement component, and the left bushing and the right bushing are fixed to the processed stoppers of the left gate and the right gate through the limiting upward movement component, and the limiting upward movement component can be used for quick replacement of the bushing.

[0010] Furthermore, the left bushing and the right bushing are provided with a cross-overlapping portion, and the left gate and the right gate are provided with a cross-overlapping portion matching therewith.

[0011] Furthermore, the inner side surface of the main bushing is set as a vertical surface, and the upper end is set as a conical circular surface matching the conical surface of the drill joint.

[0012] Furthermore, the heights of the left gate and the right gate are lower than the conical circular surface of the main bushing.

[0013] Furthermore, it comprises a bushing pressure plate, and the main bushing is fixed to the clamp head box through the bushing pressure plate.

[0014] Further, it comprises a locking device, the locking device comprises a second telescopic device, a pressure rod, a pull rod, and a locking pin, the second telescopic device is arranged on the clamp head housing, the clamp head housing is provided with a locking hole, the locking pin is slidably arranged in the locking hole, and a waist-shaped groove is arranged in the middle of the locking pin;

[0015] The clamp head box is provided with an ear plate, and pin holes are provided at both ends of the pull rod. One end is connected to the second telescopic device, and the other end is rotatably connected to the ear plate. A pin hole is provided in the middle of the pressure rod, which is rotatably set on the ear plate. One end of the pressure rod is inserted into the waist-shaped groove, and the other end is set as a transmission end.

[0016] Furthermore, the locking pin is provided with a return spring.

[0017] Furthermore, a method for using a new type of pliers for a drilling platform comprises the following steps:

[0018] S1: When the pliers head is placed into the drill, the second telescopic device is first contracted to pull the pull rod backward, and the pull rod rotates along the ear plate, and the pull rod presses down one end of the pressure rod. The pressure rod uses the ear plate as a fulcrum, and the other end of the pressure rod tilts up, driving the locking pin to move upward and leave the locking position, thereby achieving unlocking;

[0019] S2: Contracting the first telescopic device to rotate the left door and the right door around the pin shaft to open the door;

[0020] S3: After the drill tool is inserted, the conical surface of the drill tool joint is made to fit with the conical circular surface of the main bushing and to be subjected to force;

[0021] S4: Extending the first telescopic device to rotate the left door and the right door around the pin shaft to put them in a closed state;

[0022] S5: By extending the second telescopic device, the pull rod is pushed forward, the pull rod rotates along the ear plate, and the locking pin drops to the locking position under the action of the return spring, thereby realizing the locking function.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] The present invention provides a new type of pliers head for a drilling platform, the design of which optimizes the structure and function of a traditional pliers head, and achieves higher operating efficiency and safety. Specifically, by adopting a combination of a main bushing, a left gate, a right gate, and a first telescopic device, the pliers head is more flexible when opening and closing and occupies less space, thereby reducing the impact on the working space. In addition, the overlapping part design of the left gate and the right gate enhances the wrapping of the pliers head, reduces the shaking when buckling, and improves the stability and safety of the operation.

[0025] During operation, the weight of the drill tool is borne by the main bushing, and the left and right gates do not bear the load, which increases the service life of the gates and reduces the maintenance frequency. The left and right gates do not bear the force generated when the drill tool is tilted, further improving their durability.

[0026] At the same time, by introducing a limiting upward movement component to fix the left and right bushings, the function of quickly replacing the bushings is realized, further improving maintenance efficiency. The design of the locking device adopts automatic control. Through the coordinated work of the second telescopic device, the pressure rod, the pull rod and the locking pin, the automatic locking and unlocking of the clamp head is realized, which greatly improves the degree of automation and reduces the need for manual operation. Overall, the design of the new clamp head effectively solves the problems existing in the existing technology and provides a safer, more efficient and convenient clamp head solution for drilling platforms.

[0027] In addition, the present invention also has the following beneficial effects:

[0028] 1. Improve work efficiency: By optimizing the clamp head structure, the operation steps and time during the operation are reduced, and the overall work efficiency is improved.

[0029] 2. Enhanced safety: The dual mechanism ensures the safety of operators and reduces safety risks during the operation.

[0030] 3. Save space: It takes up little space and is convenient for operation in narrow spaces.

[0031] 4. Improved wrapping: The wrapping of the pliers head is enhanced, the shaking during buckling is reduced, and the operation stability is improved.

[0032] 5. High degree of automation: The automatic locking and unlocking function of the clamp head is realized, which reduces the need for manual operation and improves the degree of automation.

[0033] In summary, the new clamp head provided by the present invention is superior to the existing technology in terms of structural design, function realization and performance, and has brought significant improvements and enhancements to oil drilling operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of the present invention;

[0035] Figure 2 is a top view of the present invention;

[0036] Figure 3 It is a structural schematic diagram of the bushing of the present invention;

[0037] Figure 4 It is a side structural schematic diagram of the present invention;

[0038] Figure 5 It is a schematic structural diagram of the locking pin of the present invention;

[0039] Figure 6 It is a structural schematic diagram of the pressure rod of the present invention;

[0040] Figure 7 It is a structural schematic diagram of the pull rod of the present invention.

[0041] Markings in the figure:

[0042] 1-clamp head box, 2-main bushing, 3-left door, 4-right door, 5-first telescopic device, 6-left bushing, 7-right bushing, 8-limit upward movement component, 9-second telescopic device, 10-pressure rod, 11-pull rod, 12-locking pin, 13-waist-shaped groove, 14-ear plate, 15-reset spring, 16-conical round surface, 17-bushing pressure plate.

[0043] Specific Examples

[0044] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0045] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0046] In this embodiment, if Figure 1 , 2As shown, a new type of clamp head for a drilling platform comprises: a clamp head box 1, a main bushing 2, a left gate 3, a right gate 4 and a first telescopic device 5. The main bushing 2 is arranged in the middle of the clamp head box 1, and the left gate 3 and the right gate 4 are arranged at the opening of the main bushing 2. The left gate 3 and the right gate 4 are rotatably arranged on the clamp head box 1 through a pin shaft. One end of the first telescopic device 5 is rotatably arranged on the clamp head box 1, and the other end is arranged as a telescopic end, which is hinged with one end of the left gate 3 and the right gate 4, and is used to push the left gate 3 and the right gate 4 to rotate around the pin shaft to realize opening or closing of the gate.

[0047] In this embodiment, the left gate 3 and the right gate 4 each correspond to a set of opening devices and are symmetrically arranged. The left gate 3 and the right gate 4 are rotatably arranged on the clamp head box 1 through a pin shaft. One end of the pin shaft is connected to the first telescopic device 5 at the left gate 3 and the right gate 4. In this embodiment, the first telescopic device 5 adopts a hydraulic cylinder device, and the left gate 3 and the right gate 4 are rotated by the extension and contraction of the hydraulic cylinder to realize the door opening and closing function. When the hydraulic cylinder is extended and contracted, the fixed end of the hydraulic cylinder rotates on the clamp head box 1;

[0048] The present invention provides a new type of pliers head for a drilling platform, the design of which optimizes the structure and function of a traditional pliers head, and achieves higher operating efficiency and safety. By adopting a combination of a main bushing 2, a left gate 3, a right gate 4, and a first telescopic device 5, the pliers head is more flexible when opening and closing and occupies less space, thereby reducing the impact on the working space. At the same time, the overlapping part design of the left gate 3 and the right gate 4 enhances the wrapping of the pliers head, reduces the shaking when buckling, and improves the stability and safety of the operation.

[0049] Furthermore, the left gate 3 and the right gate 4 are provided with processed stoppers, and the left core 6 and the right core 7 are provided at the opening of the main core 2. The left core 6 and the right core 7 are installed on the left gate 3 and the right gate 4 through the processed stoppers of the left gate 3 and the right gate 4.

[0050] The installation of the left bushing 6 and the right bushing 7 is further limited, and stoppers are arranged on the upper part of the left bushing 6 and the right bushing 7, and the installation of the left bushing 6 and the right bushing 7 on the left gate 3 and the right gate 4 is realized by installing the stoppers on the processed stoppers arranged on the upper part or the top of the left gate 3 and the right gate 4. This design enables the left bushing 6 and the left gate 3, and the right bushing 7 and the right gate 4 to fit closely, limits the horizontal and downward movement of the left bushing 6 and the right bushing 7, and improves the overall structural strength and stability of the clamp head.

[0051] In order to further stabilize the connection between the left bushing 6 and the left gate 3, and the right bushing 7 and the right gate 4, a component for limiting the upward movement of the left bushing 6 and the right bushing 7 is provided. In this embodiment, the component is a spring pin, and the left bushing 6 and the right bushing 7 are fixed to the machined stoppers of the left gate 3 and the right gate 4 through the spring pin. The spring pin can be used for quick replacement of the bushing. In other embodiments, the component can be a bolt, and the left bushing 6 and the left gate 3, and the right bushing 7 and the right gate 4 are connected together by the bolt to limit the upward displacement of the left bushing 6 and the right bushing 7; the component can also be a cover plate provided on the upper part of the left bushing 6 and the right bushing 7, and the upward displacement of the left bushing 6 and the right bushing 7 is limited by connecting the cover plate to the upper part of the left gate 3 and the right gate 4.

[0052] The introduction of a component that limits the upward displacement of the left bushing 6 and the right bushing 7 further stabilizes the connection between the left bushing 6 and the left gate 3, and the right bushing 7 and the right gate 4. This design enables the function of quickly replacing the bushing, further improving the maintenance efficiency. At the same time, the use of this component also increases the reliability and durability of the clamp head.

[0053] Furthermore, the left bushing 6 and the right bushing 7 are provided with an overlapping portion, and the left gate 3 and the right gate 4 are provided with an overlapping portion matching therewith. In this embodiment, the overlapping portion matching the left bushing 6 and the left gate 3 and the overlapping portion matching the right bushing 7 and the right gate 4 are both provided with holes, and the spring pins are provided in the provided holes.

[0054] In this embodiment, the overlapping parts are set to be "concave" and "convex" types, and when used together, even if one side of the door fails, the drilling tool can be effectively supported to avoid safety accidents.

[0055] Furthermore, the inner side surface of the main bushing 2 is set as a vertical surface, and the upper end is set as a conical circular surface 16 matching the conical surface of the drill joint.

[0056] In this way, all the weight of the drilling tool can be borne by the conical circular surface 16 at the upper end of the main bushing 2, preventing the elevator body, the left gate 3 and the right gate 4 from bearing the load together, reducing the requirements for the gate strength and structural safety, and improving the durability of the equipment.

[0057] Furthermore, the heights of the left gate 3 and the right gate 4 are lower than the conical circular surface 16 of the main bushing 2 .

[0058] This arrangement ensures that all the weight of the drilling tool is in contact with the upper conical circular surface 16 of the main bushing 2, so that the main bushing 2 bears all the load, while the left gate 3 and the right gate 4 do not bear the weight of the drilling tool. The vertical circular surfaces of the left gate 3, the right gate 4 and the main bushing 2 provide wrapping for the drilling tool, reducing the shaking of the drilling tool.

[0059] Furthermore, a bushing pressing plate 17 is included, and the main bushing 2 is fixed to the clamp head box 1 through the bushing pressing plate 17 .

[0060] The main bushing 2 is fixed to the clamp head box 1 by the bushing pressing plate 17. This design ensures the stability of the main bushing 2 during operation and prevents it from loosening or falling off due to vibration or impact.

[0061] Further, a locking device is included, the locking device includes a second telescopic device 9, a pressure rod 10, a pull rod 11, and a locking pin 12, the second telescopic device 9 is arranged on the clamp head box 1, a locking hole is arranged at a corresponding position, the locking pin 12 is slidably arranged in the locking hole, and a waist-shaped groove 13 is arranged in the middle of the locking pin 12;

[0062] The pliers head box 1 is provided with an ear plate 14, pin holes are provided at both ends of the pull rod 11, one end is connected to the second telescopic device 9, and the other end is rotatably connected to the ear plate 14, a pin hole is provided in the middle of the pressure rod 10, and it is rotatably set on the ear plate 14, one end of the pressure rod 10 is inserted into the waist-shaped groove 13, and the other end is set as the transmission end.

[0063] Specifically, when unlocking, the second telescopic device 9 is retracted to pull the pull rod 11 backward, and the pull rod 11 rotates along the ear plate 14, and the pull rod 11 presses down the transmission end of the pressure rod 10, such as Figure 6 As shown, the transmission end of the pressure rod 10 and one end of the connecting locking pin 12 are provided with a certain tilting angle, which is convenient for transmission tilting, and the other end of the pressure rod 10 moves with it. The pressure rod 10 takes the ear plate 14 as a fulcrum, and one end tilts up, driving the locking pin 12 to move upward and lift it away from the locking position. The specific locking hole includes two parts of holes of the clamp head box body 1 and the left and right gates. The locking pin 12 is lifted away from the partial locking holes in the left and right gates to complete the unlocking, and there is no need to lift away the entire locking hole. The partial locking holes of the clamp head box body 1 prevent the locking pin 12 from leaving the locking holes and position the locking pin 12 to achieve unlocking; when locking, by extending the second telescopic device 9, pushing the pull rod 11 forward, the pull rod 11 rotates along the ear plate 14, and the locking pin 12 falls into the locking position (partial locking holes of the left and right gates) under the action of the reset spring 15, to achieve the locking function;

[0064] The locking and unlocking of the pliers head is achieved by pushing the locking pin 12 through the pull rod 11. This design simplifies the operation process and improves the degree of automation; this design enables the locking pin 12 to automatically reset in the unlocked state, avoiding the potential safety hazards caused by forgetting to reset.

[0065] Furthermore, the locking pin 12 is provided with a return spring 15 .

[0066] This design enables the locking pin 12 to automatically reset when unlocked, thus avoiding potential safety hazards caused by forgetting to reset it.

[0067] Furthermore, a method for using a new type of pliers for a drilling platform comprises the following steps:

[0068] S1: When the pliers are placed into the drill, the second telescopic device 9 is retracted to pull the pull rod 11 backward, and the pull rod 11 rotates along the ear plate 14, and the pull rod 11 presses down the other end of the pressure rod 10. The pressure rod 10 uses the ear plate 14 as a fulcrum, and one end is tilted, driving the locking pin 12 to move upward and leave the locking position (i.e., the locking holes on the left door 3 and the right door 4), thereby unlocking;

[0069] S2: Contract the first telescopic device 5 to rotate the left door 3 and the right door 4 around the pin shaft to open the door;

[0070] S3: After the drill tool is inserted, the conical surface of the drill tool joint is fitted with the conical circular surface 16 of the main bushing 2 and subjected to force;

[0071] S4: Extend the first telescopic device 5 to rotate the left door 3 and the right door 4 around the pin shaft to put them in a closed state;

[0072] S5: By extending the second telescopic device 9, the pull rod 11 is pushed forward, the pull rod 11 rotates along the ear plate 14, and the locking pin 12 falls into the locking position under the action of the return spring 15, thereby realizing the locking function;

[0073] Specific: Step 1:

[0074] 1. Ensure that the new pliers head and its accessories (such as telescopic device, locking device, etc.) are in good working condition and free of damage or abnormality.

[0075] 2. Select the appropriate bushing and main bushing 2 according to the size and shape of the drill joint to be operated.

[0076] 3. Install the left bushing 6 and the right bushing 7 on the left gate 3 and the right gate 4 respectively, making sure that the bushing fits tightly with the gate.

[0077] 4. Fix the main bushing 2 to the clamp head box 1 through the bushing pressure plate 17, and adjust the position so that it is aligned with the drill tool joint.

[0078] Step 2: Unlock the pliers

[0079] 1. Operate the control handle or button to retract the second telescopic device 9, driving the pull rod 11 to move backward.

[0080] 2. As the pull rod 11 moves, the locking pin 12 is pulled out of the locking position, thereby unlocking the pliers head.

[0081] 3. Ensure that the locking pin 12 is completely out of the locked position to avoid safety hazards in subsequent operations.

[0082] Step 3: Open the pliers

[0083] 1. Operate the control handle or button to retract the first telescopic device 5, driving the left gate 3 and the right gate 4 to rotate around the main bushing 2.

[0084] 2. Make sure the left door 3 and the right door 4 are fully opened to prepare for the placement of the drilling tool.

[0085] Step 4: Insert the drill bit

[0086] 1. Use an offline system or other lifting equipment to lift the drill tool to an appropriate height.

[0087] 2. Slowly move the drill tool to make the conical surface of the drill tool joint fit with the conical circular surface 16 of the main bushing 2.

[0088] 3. Gently push the drill bit to make the joint bear force and make it in close contact with the main bushing 2.

[0089] Step 5: Close the clamp head

[0090] 1. Operate the control handle or button to extend the first telescopic device 5, driving the left door 3 and the right door 4 to rotate inward and gradually close.

[0091] 2. Make sure the left door 3 and the right door 4 are completely closed and the drill is firmly clamped in the clamp head.

[0092] Step 6: Tighten the pliers

[0093] 1. Operate the control handle or button to extend the second telescopic device 9, driving the pull rod 11 to move forward.

[0094] 2. As the pull rod 11 moves, the locking pin 12 is inserted into the locking position, thereby achieving automatic locking of the pliers head.

[0095] 3. Make sure the locking pin 12 is fully inserted into the locking position to ensure the stability and safety of the pliers head.

[0096] Step 7: Complete the assignment

[0097] 1. Disconnect the offline system or other lifting equipment from the drill.

[0098] 2. Use pliers or other tools to remove the drilling tools from the wellhead or other location.

[0099] 3. Clean up the work site to ensure there are no leftovers or safety hazards.

[0100] The above description is only a preferred embodiment of the invention and is not intended to limit the invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention should be included in the protection scope of the invention.

Claims

1. A new type of pliers head for drilling platform, characterized by: include: A clamp head housing (1), a main bushing (2), a left gate (3), a right gate (4) and a first telescopic device (5), wherein the main bushing (2) is arranged in the middle of the clamp head housing (1), the left gate (3) and the right gate (4) are arranged at the opening of the main bushing (2), the left gate (3) and the right gate (4) are rotatably arranged on the clamp head housing (1) through a pin shaft, one end of the first telescopic device (5) is rotatably arranged on the clamp head housing (1), and the other end is arranged as a telescopic end and connected to one end of the left gate (3) and the right gate (4), and is used for pushing the left gate (3) and the right gate (4) to rotate around the pin shaft to realize opening or closing of the gate.

2. A new type of pliers for drilling platform according to claim 1, characterized in that: The left gate (3) and the right gate (4) are provided with processed stoppers, and the main bushing (2) is provided with a left bushing (6) and a right bushing (7) at the opening thereof. The left bushing (6) and the right bushing (7) are installed on the left gate (3) and the right gate (4) through the processed stoppers of the left gate (3) and the right gate (4).

3. A new type of pliers for drilling platform according to claim 2, characterized in that: It comprises an upward movement limiting component (8), the left bushing (6) and the right bushing (7) are fixed to the processed stoppers of the left gate (3) and the right gate (4) through the upward movement limiting component (8), and the upward movement limiting component (8) can be used for quick replacement of the left bushing (6) and / or the right bushing (7).

4. A new type of pliers for drilling platform according to claim 2, characterized in that: The left bushing (6) and the right bushing (7) are provided with a cross-overlapping portion, and the left gate (3) and the right gate (4) are provided with a cross-overlapping portion matching therewith.

5. According to the new type of pliers for drilling platform as described in claim 1, it is characterized by: The inner side surface of the main bushing (2) is arranged as a vertical surface, and the upper end portion is arranged as a conical circular surface (16) matching the conical surface of the drill joint.

6. According to the new type of pliers for drilling platform as described in claim 1, it is characterized by: The heights of the left gate (3) and the right gate (4) are lower than the conical circular surface (16) of the main bushing (2).

7. According to the new type of pliers for drilling platform as described in claim 1, it is characterized by: It comprises a bushing pressure plate (17), and the main bushing (2) is fixed to the clamp head box (1) via the bushing pressure plate (17).

8. According to the new type of pliers for drilling platform as described in claim 1, it is characterized by: The invention comprises a locking device, wherein the locking device comprises a second telescopic device (9), a pressure rod (10), a pull rod (11), and a locking pin (12); the second telescopic device (9) is arranged on the clamp head housing (1); a locking hole is arranged on the clamp head housing (1); the locking pin (12) is slidably arranged in the locking hole; a waist-shaped groove (13) is arranged in the middle of the locking pin (12); the clamp head housing (1) is provided with an ear plate (14); pin holes are arranged at both ends of the pull rod (11); one end is connected to the second telescopic device (9), and the other end is rotatably connected to the ear plate (14); a pin hole is arranged in the middle of the pressure rod (10), and the pressure rod (10) is rotatably arranged on the ear plate (14); one end of the pressure rod (10) is inserted into the waist-shaped groove (13), and the other end is arranged as a transmission end.

9. A new type of pliers for drilling platform according to claim 8, characterized in that: The locking pin (12) is provided with a return spring (15).

10. A method for using a new type of pliers for a drilling platform, applied to the new type of pliers for a drilling platform as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1: When the pliers head is placed into the drilling tool, the second telescopic device (9) is first contracted to pull the pull rod (11) backward, and the pull rod (11) rotates along the ear plate (14). The pull rod (11) presses down the other end of the pressure rod (10). The pressure rod (10) uses the ear plate (14) as a fulcrum, and one end of the pressure rod (10) is tilted, driving the locking pin (12) to move upward and leave the locking position, thereby achieving unlocking; S2: Contracting the first telescopic device (5) to rotate the left door (3) and the right door (4) around the pin shaft to place them in an open state; S3: After the drill tool is inserted, the conical surface of the drill tool joint is made to fit with the conical circular surface (16) of the main bushing (2) and to be subjected to force; S4: Extending the first telescopic device (5) causes the left door (3) and the right door (4) to rotate around the pin shaft and put them in a closed state; S5: By extending the second telescopic device (9), the pull rod (11) is pushed forward, the pull rod (11) rotates along the ear plate (14), and the locking pin (12) drops to the locking position under the action of the return spring (15), thereby realizing the locking function.

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