Portable electric power tongs for pipeline operation and operation method of portable electric power tongs

Abstract

The invention relates to a pair of portable electric power tongs for pipeline operation and an operation method thereof.The pair of portable electric power tongs comprises a tong head clamping mechanism, a shell, a power transmission system, a supporting frame and a tubular column, and the power transmission system is composed of a direct current motor, a first-stage planetary reducer, a second-stage conical reduction gear, a third-stage transition reduction gear, a storage battery, a controller and a cable; the direct current motor is arranged at the tail of the shell, and the axis of an output shaft of the direct current motor intersects and is perpendicular to the axis of the clamping tubular column; the first-stage planetary reducer, the second-stage conical reduction gear and the third-stage transition reduction gear are sequentially arranged on a transmission line between the direct-current motor and the tong head large gear. The storage battery provides direct current electric energy for the direct current motor through a cable. The electric power tongs have the advantages that traditional hydraulic power tongs are arranged into the electric power tongs, power is provided for the direct-current motor of the electric power tongs through the storage battery, and the purposes of mechanization of screwing-on and screwing-off operation of a transverse pipeline and convenience in carrying and operation are achieved.

Description

Technical Field

[0001] This invention relates to a power clamp for opening oilfield pipelines, and more particularly to a portable power clamp that is powered by electricity and suitable for horizontal pipeline operations, belonging to the field of petroleum equipment manufacturing technology. Background Technology

[0002] Typically, auxiliary pipelines for oil wells in oil fields are made of small-diameter tubing connected by threads. There is no mechanical equipment for loading and unloading threads on site, and the work still relies on manual operation with hand-held pipe wrenches. This results in high labor intensity, long working time, low work efficiency, and the torque on the tubing string cannot be effectively controlled.

[0003] The reasons are as follows: First, there is a lack of hydraulic power at the pipeline operation site, making it impossible to use conventional hydraulic power pliers; second, the environment at the pipeline operation site is harsh, making it inconvenient to transport large equipment, and conventional power pliers are heavy and inconvenient to operate on site; third, most pipelines are horizontal, while conventional open-end power pliers are used for vertical oil well pipelines, and their pliers are horizontal. If used for horizontal pipelines, the power pliers need to be erected, but the existing power pliers' large gear straightening mechanism cannot meet the straightening support of the large gear when erected.

[0004] Therefore, there is an urgent need for a power clamp that can perform electromechanical operations on transverse pipelines, and is portable, easy to operate, highly efficient, and has stable torque. Summary of the Invention

[0005] This invention provides a portable electric power clamp for pipeline operations and its operating method. It converts a traditional hydraulic power clamp into an electric power clamp and uses a battery to power the DC motor of the electric power clamp, thereby achieving mechanized operation of attaching and detaching clamps on horizontal pipelines, and making it convenient to carry and operate.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a portable electric power pliers for pipeline operations, comprising a plier head clamping mechanism, a housing, a power transmission system, a support frame, and a pipe string, wherein the plier head clamping mechanism includes a large plier head gear, and the plier head clamping mechanism is disposed at the front of the housing, characterized in that: The power transmission system consists of a DC motor, a first-stage planetary reducer, a second-stage bevel gear reducer, a third-stage transition gear reducer, a battery, a controller, and cables. The DC motor is located at the rear of the housing, and the axis of its output shaft intersects and is perpendicular to the axis of the clamping column. The first-stage planetary reducer, the second-stage bevel gear, and the third-stage transition gear are sequentially arranged on the transmission route between the DC motor and the large caliper gear. The second-stage bevel gear and the third-stage transition gear transmit the power output of the DC motor to the large caliper gear by rotating the direction of the power output by the DC motor by 90° through a pair of meshing spiral bevel gears. The battery supplies DC power to the DC motor via a cable; The controller includes a drive module and emergency stop button, forward rotation button, reverse rotation button, and speed adjustment button, which are mounted on the cable connecting the battery and the DC motor. The drive module is used to set the operating parameters of the DC motor and adjust them before operation; the forward and reverse buttons are used during fastening, unfastening, stopping operations, and in case of abnormalities; the emergency stop button is used when the forward or reverse button malfunctions. The speed control button adjusts the output speed of the DC motor to obtain the speed for fastening or unfastening.

[0007] The support frame is a three-dimensional metal welded frame with legs at the bottom and an upward-opening volume cavity inside. The clamping mechanism is placed vertically in the volume cavity with its opening facing downward. The shape of the volume cavity is consistent with the shape of the shell, and all six degrees of freedom of the shell are constrained by the volume cavity.

[0008] Furthermore, the support frame has four legs, each leg is divided into two sections, and the height of the support frame is adjusted by a sliding joint or screw joint structure between the two sections of the leg, and is fastened by bolts.

[0009] In this technical solution, a method for operating a portable electric power wrench for pipework includes the following steps: I. Top-down operation: Step 1: Place the electric power pliers vertically in the support frame. The support frame bears the counter-torque of the electric power pliers during the clamping or unclamping process. Adjust the height of the support frame so that the center of the clamping mechanism of the electric power pliers head is concentric with the pipe column. Step 2: Move the electric power clamp so that the clamping mechanism is aligned with the part of the pipe to be clamped. The battery is connected to the DC motor through the controller. The current value and safety current value required for the clamping torque or release torque are preset. Step 3: Press the forward rotation button on the controller. The DC motor drives the large gear of the clamp head to rotate clockwise, so that the clamp head clamping mechanism clamps the upper clip of the pipe column. After reaching the upper clipping torque, the rotation automatically stops. Step 4: Release the forward rotation button and press the reverse rotation button. The large gear of the pliers will rotate counterclockwise, the clamping mechanism of the pliers will loosen and move away from the tubing, returning to the initial position. Step 5: Continue to rotate the large gear of the pliers counterclockwise until the opening of the pliers clamping mechanism coincides with the opening of the housing. Then release the reverse button to complete one clamping operation. Unfastening operation: Steps 1 and 2 are the same as steps 1 and 2 of the upper-cutting operation; Step 3: Press the reverse button on the controller. The DC motor drives the large gear of the clamp head to rotate counterclockwise. The clamp head clamping mechanism clamps the pipe column until the pipe column threads are unscrewed. Step 4: Release the reverse button and press the forward button. The large gear of the pliers rotates clockwise, the clamping mechanism of the pliers loosens and moves away from the tubing, returning to the initial position; Step 5: Continue to rotate the large gear of the pliers clockwise until the opening of the pliers clamping mechanism coincides with the opening of the housing, thus completing one unfastening operation.

[0010] In step 2, the parameters for setting the operation of the DC motor are set on the drive module; If you need to stop the operation or encounter any abnormal situation during the operation, release the forward or reverse button. If the forward or reverse button malfunctions, press the emergency stop button.

[0011] Depending on the operation requirements, rotate the speed control button to adjust the output speed of the DC motor to obtain the required fastening or unfastening speed.

[0012] This invention provides a portable electric power wrench for pipeline operations and its operating method. It is lightweight, easy to carry, simple to operate, and highly efficient. The torque for tightening and loosening the wrench can be effectively controlled, which greatly improves the quality of the operation and reduces the labor intensity of the workers. It is powered by a storage battery, which solves the power needs of field operations and does not pollute the environment. Its economic and social benefits are considerable. Attached Figure Description

[0013] Appendix Figure 1 This is a schematic diagram of the main structure of the present invention; Appendix Figure 2 This is a schematic diagram of the left-side structure of the present invention; Appendix Figure 3 This is a schematic diagram (half-sectional view) of the main structure of the electric power clamp of the present invention. Appendix Figure 4 for Figure 3 Sectional view A-A.

[0014] In the diagram: 1. Clamping mechanism, 101. Large gear of clamping head, 2. Housing, 3. Power transmission system, 301. DC motor, 302. First-stage planetary reducer, 303. Second-stage bevel gear, 304. Third-stage transition gear, 305. Battery, 306. Controller, 307. Cable, 4. Support frame, 5. Pipe column. Detailed Implementation

[0015] The present invention will be further explained and described below with reference to the accompanying drawings: As attached Figure 1 , 2 As shown in Figures 3 and 4, a portable electric power pliers for pipework includes a clamping mechanism 1, a housing 2, a power transmission system 3, a support frame 4, and a pipe string 5. The clamping mechanism 1 includes a large clamping gear 101 and is located at the front of the housing 2. The power transmission system 3 consists of a DC motor 301, a first-stage planetary reducer 302, a second-stage bevel gear 303, a third-stage transition gear 304, a battery 305, a controller 306, and a cable 307. The DC motor 301 is located at the rear of the housing 2, and the axis of its output shaft intersects and is perpendicular to the axis of the clamping column 5. The first-stage planetary reducer 302, the second-stage bevel gear 303, and the third-stage transition gear 304 are sequentially arranged on the transmission route between the DC motor 301 and the pliers large gear 101. The second-stage bevel gear 303 and the third-stage transition gear 304, through a pair of meshing spiral bevel gears, rotate the direction of the DC motor 301's output power by 90° and transmit it to the pliers large gear 101. The storage battery 305 supplies DC power to the DC motor 301 through the cable 307; The controller 306 includes a drive module and an emergency stop button, a forward rotation button, a reverse rotation button, and a speed adjustment button, which are mounted on the cable 307 connecting the battery 305 and the DC motor 301. The support frame 4 is a three-dimensional metal welded frame with legs at the bottom and an upward-opening volume cavity inside. The clamping mechanism 1 is placed in the volume cavity in a vertical position with the opening facing downward. The shape of the volume cavity is consistent with the shape of the shell 2, and all six degrees of freedom of the shell 2 are constrained by the volume cavity.

[0016] The support frame 4 has four legs, each leg is divided into two sections. The height of the support frame 4 is adjusted by a sliding joint or screw joint structure between the two sections of the legs and is fastened with bolts.

[0017] The drive module is used to set the operating parameters of the DC motor 301 and adjust them before operation; the forward and reverse buttons are used during fastening, unfastening, stopping, and in case of abnormalities; the emergency stop button is used when the forward or reverse button malfunctions. The speed control button adjusts the output speed of the DC motor 301 to obtain the speed for fastening or unfastening.

[0018] The specific operation method of this technical solution is divided into the following steps. I. Top-down operation: Step (1): Place the electric power pliers vertically in the support frame 4. The support frame 4 bears the counter torque of the electric power pliers during the fastening or unfastening process. Adjust the height of the support frame 4 so that the center of the clamping mechanism 1 of the electric power pliers head is concentric with the pipe column 5. Step (2): Move the electric power clamp so that the clamping mechanism 1 is aligned with the part of the column 5 to be clamped. The battery 305 is connected to the DC motor 301 through the controller 306. The current value and safety current value required for the upper clamping torque or the lower clamping torque are preset. Step (3): Press the forward rotation button on the controller 306, and the DC motor 301 drives the large gear 101 of the clamp head to rotate clockwise, so that the clamp head clamping mechanism 1 clamps the tube column 5 and automatically stops rotating after reaching the clamping torque; Step (4): Release the forward rotation button and press the reverse rotation button. The large gear 101 of the pliers rotates counterclockwise, the clamping mechanism 1 of the pliers is released and moves away from the column 5, returning to the initial position. Step (5): Continue to rotate the large gear 101 of the pliers counterclockwise until the opening of the clamping mechanism 1 of the pliers coincides with the opening of the housing 2, then release the reverse button to complete one clamping operation; II. Unfastening Operation: Steps (1) and (2) are the same as steps (1) and (2) of the above-cutting operation; Step (3): Press the reverse button on the controller 306, the DC motor 301 drives the large gear 101 of the clamp head to rotate counterclockwise, and the clamp head clamping mechanism 1 clamps the pipe column 5 until the thread of the pipe column 5 is unscrewed; Step (4): Release the reverse button, press the forward button, the large gear 101 of the pliers rotates clockwise, the clamping mechanism 1 of the pliers is released and moves away from the column 5, and returns to the initial position; Step (5): The large gear 101 of the pliers head continues to rotate clockwise until the opening of the clamping mechanism 1 of the pliers head coincides with the opening of the housing 2, and one unfastening operation is completed.

Claims

1. A portable electric power wrench for pipework, comprising a clamping mechanism, a housing, a power transmission system, a support frame, and a pipe string, wherein the clamping mechanism includes a large clamping gear, and the clamping mechanism is disposed at the front of the housing, characterized in that: The power transmission system consists of a DC motor, a first-stage planetary reducer, a second-stage bevel gear reducer, a third-stage transition gear reducer, a battery, a controller, and cables. The DC motor is located at the rear of the housing, and the axis of its output shaft intersects and is perpendicular to the axis of the clamping column. The first-stage planetary reducer, the second-stage bevel gear, and the third-stage transition gear are sequentially arranged on the transmission route between the DC motor and the large caliper gear. The second-stage bevel gear and the third-stage transition gear transmit the power output of the DC motor to the large caliper gear by rotating the direction of the power output by the DC motor by 90° through a pair of meshing spiral bevel gears. The battery supplies DC power to the DC motor via a cable; The controller includes a drive module and emergency stop button, forward rotation button, reverse rotation button, and speed adjustment button, which are mounted on the cable connecting the battery and the DC motor. The support frame is a three-dimensional metal welded frame with legs at the bottom and an upward-opening volume cavity inside. The clamping mechanism is placed vertically in the volume cavity with its opening facing downward. The shape of the volume cavity is consistent with the shape of the shell, and all six degrees of freedom of the shell are constrained by the volume cavity.

2. The portable electric power wrench for pipeline operations according to claim 1, characterized in that: The support frame has four legs, each leg is divided into two sections, and the height of the support frame is adjusted by a sliding joint or screw joint structure between the two sections of the legs, and is fastened by bolts.

3. The portable electric power wrench for pipeline operations according to claim 1, characterized in that: The drive module is used to set the operating parameters of the DC motor and adjust them before operation; the forward and reverse buttons are used during fastening, unfastening, stopping operations, and in case of abnormalities; the emergency stop button is used when the forward or reverse button malfunctions.

4. A portable electric power wrench for pipework according to claim 1 or 3, characterized in that: The speed control button adjusts the output speed of the DC motor to obtain the speed for fastening or unfastening.

5. The operating method of a portable electric power wrench for pipe working as described in any one of claims 1-4, characterized in that: It is divided into the following steps, I. Top-down operation: Step (1): Place the electric power pliers vertically in the support frame. The support frame bears the counter torque of the electric power pliers during the fastening or unfastening process. Adjust the height of the support frame so that the center of the clamping mechanism of the electric power pliers head is concentric with the pipe column. Step (2): Move the electric power clamp so that the clamping mechanism is aligned with the part of the pipe to be clamped. The battery is connected to the DC motor through the controller. The current value and safety current value required for the upper or lower torque are preset. Step (3): Press the forward rotation button on the controller. The DC motor drives the large gear of the clamp head to rotate clockwise, so that the clamp head clamping mechanism clamps the upper buckle of the pipe column. After reaching the upper buckling torque, the rotation stops automatically. Step (4): Release the forward rotation button and press the reverse rotation button. The large gear of the pliers rotates counterclockwise, the clamping mechanism of the pliers loosens and moves away from the tube column, returning to the initial position; Step (5): Continue to rotate the large gear of the pliers counterclockwise until the opening of the clamping mechanism of the pliers coincides with the opening of the housing. Then release the reverse button to complete one clamping operation. II. Unfastening Operation: Steps (1) and (2) are the same as steps (1) and (2) of the above-cutting operation; Step (3): Press the reverse button on the controller, the DC motor drives the large gear of the clamp head to rotate counterclockwise, and the clamp head clamping mechanism clamps the pipe column until the pipe column thread is unscrewed; Step (4): Release the reverse button and press the forward button. The large gear of the pliers rotates clockwise, the clamping mechanism of the pliers loosens and moves away from the tube column, returning to the initial position; Step (5): Continue to rotate the large gear of the pliers clockwise until the opening of the pliers clamping mechanism coincides with the opening of the housing, and one unfastening operation is completed.

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