CN214922100U - Hydraulic screwing system - Google Patents

Abstract

The embodiment of the utility model discloses system of detaining is twisted to hydraulic pressure belongs to and twists the equipment field of detaining. This hydraulic pressure system of screwing up includes: the hydraulic back-up tong assembly comprises a crawler-type mobile working power station, a hydraulic screwing main back-up tong assembly, a high-pressure rubber pipe and a system pressure gauge. The hydraulic power station, the hydraulic screwing main back-up tong assembly and the high-pressure rubber pipe are arranged on a crawler-type chassis of the crawler-type mobile working power station. When in use, the hydraulic screwing main back-up tong assembly is hoisted to an operation position through a vehicle-mounted suspension arm of the crawler-type mobile working power station. The hydraulic power station drives the hydraulic screwing main back-up tong assembly to grab the seamless sleeve and complete screwing operation through hydraulic pressure. The crawler-type mobile working power station of the hydraulic screwing system has the capability of mobile operation in a field environment, the hydraulic screwing main back-up tong assembly realizes screwing operation in the horizontal direction, and a system pressure gauge monitors a torque value during screwing operation to ensure working quality.

Description

Hydraulic screwing system

Technical Field

The utility model relates to a twist and detain the equipment field, in particular to system is twisted and detained to hydraulic pressure.

Background

In order to reduce overstocked inventory of seamless sleeves, some onshore oil companies propose to fully widen the application range of the inventory seamless sleeves, and use the seamless sleeves originally used in drilling operation as main pipes for ground engineering construction of oil fields. The seamless sleeve is connected by screw threads, the outer wall of one pipe end of the seamless sleeve is provided with an outer screw thread, the pipe end of the other pipe end of the seamless sleeve is provided with a coupling, and the inner wall of the coupling is provided with an inner screw thread. When the seamless pipe is actually used, the adjacent seamless pipes are connected into a whole one by one in a mode of internal and external screw thread connection. When the seamless sleeve is connected, the inner screw thread and the outer screw thread are connected together by using a rated torque value so as to avoid leakage. Therefore, in the related art, a hydraulic screwing system is used for screwing the seamless sleeve.

When the seamless sleeve is used for ground engineering construction of an oil field, the seamless sleeve needs to be screwed in the horizontal direction one by one in an outdoor environment. As the seamless casing pipe line is extended, the working equipment and personnel are required to be moved accordingly, and the hydraulic screwing system of the related art has limitations in field mobile work. In addition, since seamless casings are originally used in drilling operations, hydraulic wrenching systems in the related art are all designed to be applied to a drilling platform, performing wrenching operations one by one in the vertical direction. Therefore, there is a difficulty in employing the hydraulic tightening system of the related art in performing the horizontal tightening work, and only the manual tightening work can be employed.

In the implementation process of the utility model, the inventor finds that the related art has at least the following problems:

in the field ground engineering construction using seamless casing, there is difficulty in horizontal screwing using a vertical hydraulic screwing system for drilling. The hydraulic wrenching systems of the related art have limitations in field mobile operations. In the related art, manual screwing operation is adopted during horizontal screwing operation, and the torque acting on the seamless sleeve thread cannot be kept at a specified torque value, so that the potential risk of leakage is easily caused. Particularly, the problems of low construction efficiency, fatigue operation of constructors and the like are easily caused by manually screwing and buckling the large-diameter seamless sleeve.

Disclosure of Invention

In view of this, the embodiment of the utility model provides a hydraulic pressure system of screwing up can solve among the correlation technique hydraulic pressure system of screwing up and remove the limitation in operation and the horizontal operation of screwing up in the field to replace the artifical the knot of screwing up when the operation is screwed up to the horizontal direction, improved operating efficiency and operating quality. The technical scheme is as follows:

the embodiment of the utility model provides a hydraulic screwing system, which comprises a crawler-type mobile working power station, a hydraulic screwing main back-up tong assembly, a high-pressure rubber pipe and a system pressure gauge;

the hydraulic power station is arranged on the crawler-type mobile working power station; the hydraulic screwing main back-up tong assembly is placed on the crawler-type mobile working power station;

one end of the high-pressure rubber pipe is connected with the hydraulic power station, and the other end of the high-pressure rubber pipe is connected with the hydraulic screwing main back-up tong assembly; the system pressure gauge is arranged on the hydraulic screwing main back-up tong assembly.

Optionally, the crawler-type mobile work power station comprises a crawler-type chassis, a cab, an indoor crane operating platform, diesel self-generating equipment and a vehicle-mounted suspension arm;

the cab, the diesel self-generating equipment and the vehicle-mounted suspension arm are arranged on the crawler-type chassis;

the indoor crane operating platform is arranged in the cab;

the hydraulic power station is arranged on the crawler-type chassis; the hydraulic screwing main back-up tong assembly is placed on the crawler-type chassis.

Optionally, the hydraulic screwing main back-up tong generally comprises a main tong, a back-up tong and a bracket;

the back-up tong is arranged in the middle of the bracket;

the main clamp is arranged on one side of the bracket;

and a baffle is arranged on the other side of the bracket.

Optionally, the back-up tong comprises a back-up tong housing, a back-up tong first hydraulic connecting rod, a back-up tong second hydraulic connecting rod, a back-up tong first tong head, a back-up tong second tong head, and a back-up tong third tong head;

the top of the back-up tong shell is connected with a beam at the top of the bracket;

the back-up tong first hydraulic connecting rod and the back-up tong second hydraulic connecting rod are respectively arranged on two sides of the back-up tong shell;

the back-up tong first tong head is arranged at the center of the bottom of the back-up tong shell; the back-up tong second tong head is arranged at the tail end of the back-up tong first hydraulic connecting rod action arm; and the third tong head of the back-up tong is arranged at the tail end of the second hydraulic connecting rod action arm of the back-up tong.

Optionally, the main tong comprises a main tong housing, a cylindrical pin, a main tong head and a reversing valve;

the top of the main tong shell is connected with the frame at the top of the support, and two sides of the main tong shell are fixed on the frames at two sides of the support through the cylindrical pins;

the main tong head is arranged on the main tong shell;

the reversing valve is installed on the main clamp shell.

Optionally, the back-up tong housing has shoulders projecting outwardly and a base forming a dovetail-like recess.

Optionally, the back-up tong first tong head is mounted at the middle position of the dovetail-shaped notch at the bottom of the back-up tong shell.

Optionally, the main tong housing lower part has a downwardly open annular gap.

Optionally, the main tong head is a downwardly open ring structure.

Optionally, the center of the main tong head coincides with the center of the annular notch at the lower part of the main tong shell.

The embodiment of the utility model provides a beneficial effect that technical scheme brought includes at least:

the embodiment provides a hydraulic screwing system, and solves the difficulty of application of the hydraulic screwing system in the related technology in the oil field ground engineering construction. This crawler-type mobile power station of system is twisted up to hydraulic pressure has satisfied the field and has removed the operation to the demand of removing and power supply, has solved among the correlation technique hydraulic pressure and has twisted up the problem that the system has the limitation when field mobility operation. This hydraulic pressure system of screwing up can replace artifical completion seamless sleeve pipe snatch and screw up, the operation of breaking out at the horizontal direction to stable output torque passes through the screw thread with seamless sleeve pipe and connects the equipment together, has both improved the stability that operating efficiency has also improved the operating quality.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings that need to be used in the embodiments will be described below.

Fig. 1 is a schematic layout view of a hydraulic screwing system provided by an embodiment of the present invention;

fig. 2 is a layout side view of a hydraulic screwing system provided by an embodiment of the present invention;

fig. 3 is a plan view of a layout of a hydraulic screwing system according to an embodiment of the present invention;

fig. 4 is a side view of a hydraulic screwing main back-up tong assembly provided by the embodiment of the present invention;

FIG. 5 is a cross-sectional view of the hydraulic back-up wrench assembly of FIG. 4 in a position A-A in accordance with an embodiment of the present invention;

fig. 6 is a front view of the hydraulic screwing main back-up tong assembly provided by the embodiment of the present invention.

Wherein the reference numerals denote:

1-crawler-type mobile working power station;

2-a hydraulic power station;

3, screwing a main back-up tong assembly hydraulically;

4-high pressure rubber tube;

5, a system pressure gauge;

6-crawler-type chassis;

7-cab;

8, an indoor crane operating platform;

9-diesel self-generating equipment;

10-vehicle mounted suspension arm;

11-main tong;

12-back-up tong;

13-a scaffold;

14-back-up tong housing;

15-back-up tong first hydraulic link;

16-back-up tong second hydraulic link;

17-back-up tong first tong head;

18-back-up tong second tong head;

19-third binding clip of back-up tong;

20-main tong housing;

21-a cylindrical pin;

22-main tong head;

23-a reversing valve.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, embodiments of the present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1, fig. 2 and fig. 3, the embodiment of the utility model provides a hydraulic pressure system of screwing up, including crawler-type mobile power station 1, hydraulic power station 2, hydraulic pressure screw up main back tong assembly 3, high-pressure rubber pipe 4, system pressure gauge 5.

The hydraulic power station 2 is arranged on the crawler-type mobile working power station 1; the hydraulic screwing main back-up tong assembly 3 is placed on the crawler-type mobile working power station 1;

one end of the high-pressure rubber pipe 4 is connected with the hydraulic power station 2, and the other end of the high-pressure rubber pipe 4 is connected with the hydraulic screwing main back-up tong assembly 3; and a system pressure gauge 5 is arranged on the hydraulic screwing main back-up tong assembly 3.

In an alternative embodiment, as shown in fig. 1, the crawler type mobile work power station 1 comprises a crawler type chassis 6, a cab 7, an indoor crane operation table 8, a diesel self-generating device 9 and an on-board suspension arm 10.

As shown in fig. 1, a hydraulic power station 2, a cab 7, a diesel self-generating device 9, and an on-vehicle suspension arm 10 are mounted on a crawler-type chassis 6. An indoor crane operation table 8 is installed in the cab 7.

As shown in fig. 3, the hydraulic back-up tong assembly 3 is placed on a tracked chassis 6.

The hydraulic screwing main back-up tong assembly 3 is used for completing the operations of tightening and unscrewing the seamless sleeve. The cab 7 is used to operate the tracked chassis 6 to move freely in the field environment. The indoor crane operating platform 8 is used for operating the vehicle-mounted suspension arm 10 to hoist the hydraulic screwing main back-up tong assembly 3 to a position suitable for grabbing a seamless sleeve and hoisting the seamless sleeve back to the crawler-type chassis 6 after the operation is finished. The diesel self-generating equipment 9 is used for providing electric power for the hydraulic power station 2. The hydraulic power station 2 is used for converting electric power into hydraulic pressure taking a hydraulic medium as a medium, and the hydraulic pressure is pumped into the hydraulic screwing main back-up tong assembly 3 through the high-pressure hose 4. The system pressure gauge 5 is installed on the hydraulic screwing main back-up tong assembly 3 and used for monitoring a hydraulic value output by the hydraulic screwing main back-up tong assembly 3 and converting the hydraulic value into a corresponding screwing torque value. During operation, the hydraulic power station is adjusted according to the torque value provided by the system pressure gauge 5 until the screwing torque reaches the rated torque value, so that the screwing operation of the rated torque value is completed.

Exemplarily, the crawler-type mobile working power station 1 is a man HY100 type mobile working power station for pipelines.

Illustratively, the hydraulic power station 2 includes an air cooling device.

The air cooling device of the hydraulic power station 2 is used for cooling the hydraulic power station 2 and preventing the hydraulic power station 2 from overheating.

The hydraulic power station 2 illustratively includes safety controls.

The safety control of the hydraulic power station 2 is used for overload protection of the hydraulic power station 2.

Illustratively, the weight and the suspension distance of the hydraulic screwing main back-up tong assembly 3 meet the safe use requirement of the on-vehicle suspension arm.

Exemplarily, as shown in fig. 1, in order to maintain the overall center of gravity of the hydraulic screwing system 1 stable, the hydraulic screwing system 1 adopts the following layout:

the cab 7 is located at a forward left position of the tracked chassis 6, and the hydraulic power station 2 is located behind the cab 7, adjacent to the cab 7. The hydraulic screwing main back-up tong assembly 3 is positioned at the rear part of the left side of the crawler-type chassis 6 and behind the hydraulic power station 2. The vehicle-mounted suspension arm 10 is located at the middle rear position of the crawler-type chassis 6, and the diesel self-generating equipment 9 is located at the right rear position of the crawler-type chassis 6.

Illustratively, as shown in fig. 2, the high-pressure hose 4 is accommodated and suspended between the hydraulic power station 2 and the hydraulic tightening main back-up tong assembly 3 when the tightening operation is not performed.

Exemplarily, the embodiment of the present invention provides an implementation manner of a hydraulic screwing system as follows:

the crawler-type chassis 6 is operated in the cab 7 to move to a position to be operated, and then the hydraulic power station 2 and the hydraulic screwing main back-up tong assembly 3 are connected by the high-pressure rubber pipe 4. And the crane operating platform 8 in the operating room controls the vehicle-mounted suspension arm 10 to lift the hydraulic screwing main back-up tong assembly 3 and move the hydraulic screwing main back-up tong assembly 3 to the to-be-screwed part of the seamless sleeve. And (4) turning on the diesel self-generating equipment 9 to provide power for the hydraulic power station 2. The hydraulic power station 2 converts the electric power into hydraulic pressure and outputs the hydraulic pressure to the hydraulic screwing main back-up tong assembly 3 through the high-pressure rubber hose 4. And operating the hydraulic screwing main back-up tong assembly 3 to grab the seamless sleeve. After the seamless sleeve is grabbed, the hydraulic pressure output by the hydraulic power station 2 is adjusted according to a system pressure gauge 5, so that the hydraulic screwing main back-up tong assembly 3 can perform stable screwing and unscrewing operation according to a rated torque value required by screwing.

After the screwing operation is finished, the hydraulic screwing main back-up tong assembly 3 is operated to loosen the seamless sleeve. And (3) hoisting the hydraulic screwing main back-up tong assembly 3 to the position of the next screwing operation by using the vehicle-mounted suspension arm 10, and continuing the operation. And if the hoisting cannot reach the next position, hoisting the hydraulic screwing main back-up tong assembly 3 back to the crawler-type chassis 6 and operating the crawler-type chassis 6 to move to the next position.

The embodiment of the utility model provides a system is twisted up to hydraulic pressure to its crawler-type chassis is the carrier, has realized that system is twisted up to hydraulic pressure removes the operation under the field environment, provides electric power for field work with its diesel oil from power generation facility. The power, hoisting and screwing components of the hydraulic screwing system are reasonably and compactly arranged on the same crawler chassis, so that field moving operation is more convenient.

In an alternative embodiment, as shown in fig. 4, the hydraulic back-up wrench assembly 3 includes a main wrench 11, a back-up wrench 12, a bracket 13, and a reversing valve 23.

The main tong 11 includes a main tong housing 20, a cylindrical pin 21, and a main tong head 22.

The back-up tong 12 comprises a back-up tong shell 14, a back-up tong first hydraulic connecting rod 15, a back-up tong second hydraulic connecting rod 16, a back-up tong first tong head 17, a back-up tong second tong head 18 and a back-up tong third tong head 19.

The reversing valve 23 is installed on the main clamp shell 20 and is used for controlling the main clamp 11 and the back clamp 12 of the hydraulic screwing main back clamp assembly 3 to complete clamping, loosening, rotating and the like by controlling the output direction of the hydraulic medium.

In an alternative embodiment, as shown in figure 4, the main clamp 11 and the back clamp 12 are mounted on a bracket 13.

The back-up tong 12 is arranged on a beam at the upper part of the bracket 13 and is provided with a roller which can move along the beam at the upper part of the bracket 13 in a limited way; the main tong 11 is mounted in front of the back-up tong 12. A baffle is arranged behind the bracket 13 to prevent the back-up tong 12 from sliding out of the bracket.

The back-up tong 12 is movable along a beam in the upper part of the bracket 13 for adjusting the distance between the main tong 11 and the back-up tong 12.

Illustratively, as shown in fig. 5, the back-up tong 12 is mounted on a beam at the upper part of the bracket 13 and is provided with rollers for limited movement along the beam at the upper part of the bracket 13. The back-up tong housing 14 has an outwardly projecting shoulder and a dovetail-like recess at the bottom. The back-up tong first tong head 17 is mounted in the middle of a dovetail-shaped recess in the bottom of the back-up tong housing 14. The back-up tong first hydraulic connecting rod 15 and the back-up tong second hydraulic connecting rod 16 are respectively arranged at two sides of the back-up tong shell 14, wherein the bottom end of a hydraulic cylinder of the back-up tong first hydraulic connecting rod 15 is fixed at the left shoulder of the back-up tong shell 14; one end of an action arm of a back-up tong hydraulic connecting rod 15 is connected with the tail end of a hydraulic piston rod, the middle rear part of the action arm of the back-up tong hydraulic connecting rod 15 is arranged at the tail end of a dovetail structure on the left side of the bottom of a back-up tong shell (14) through a positioning pin, and can rotate around the positioning pin in a limited way; the cylinder bottom end of the hydraulic cylinder of the back-up tong second hydraulic connecting rod 16 is fixed on the right shoulder of the back-up tong shell 14; one end of the action arm of the back-up tong hydraulic connecting rod 16 is connected with the tail end of the hydraulic piston rod, and the middle rear part of the action arm of the second back-up tong hydraulic connecting rod 16 is arranged at the tail end of the dovetail structure at the right side of the bottom of the back-up tong shell 14 through a positioning pin and can rotate around the positioning pin in a limited way. The second tong head 18 of the back tong is arranged at the tail end of the action arm of the first hydraulic connecting rod 15 of the back tong, and the third tong head 19 of the back tong is arranged at the tail end of the action arm of the second hydraulic connecting rod 16 of the back tong.

Illustratively, the centers of the arcs of the ends of the tooth blocks of the first tong head 17, the second tong head 18 and the third tong head 19 of the back tong are the same.

The back-up tong housing 14 serves to protect and secure the back-up tong 12 and its components. The back-up tong first hydraulic connecting rod 15 and the back-up tong second hydraulic connecting rod 16 are used for completing the action of grabbing the seamless sleeve. The tail ends of the tooth blocks of the first forceps head 17, the second forceps head 18 and the third forceps head 19 of the back forceps are arc-shaped and are used for being tightly attached to the outer wall of the seamless sleeve.

Illustratively, when the hydraulic main back-up tong assembly 3 is used for horizontal back-up tong operation, the piston rods of the first back-up tong link 15 and the second back-up tong link 16 respectively extend and retract to drive the action arms connected with the tail ends of the first back-up tong link and the second back-up tong link 16 to rotate around the positioning pin for fixing the action arms, so that the positions and angles of the second back-up tong head 18 and the third back-up tong head 19 at the tail ends of the link are adjusted through leverage, and the tail ends of the tooth blocks of the second back-up tong head 18 and the third back-up tong head 19 are tightly attached to the outer wall of the seamless sleeve. The tail ends of the arc-shaped tooth blocks of the first tong head 17, the second tong head 18 and the third tong head 19 of the back-up tong are in close contact with the outer wall of the seamless sleeve to complete the action of the back-up tong 12 for grabbing the seamless sleeve.

Illustratively, as shown in fig. 6, the main tong housing 20 of the main tong 11 is mounted on the frame at the top of the bracket 13 at the top, and is fixed on the frame at both sides of the bracket 13 by the cylindrical pins 21 at both sides, and the lower part is a downward opening annular notch. The main tong head 22 is a downwardly open ring structure and is mounted on a downwardly open ring-shaped notch of the main tong housing 20.

The main tong head 22 can rotate around the centre of its ring structure but cannot move up, down, left or right.

The downward opening annular design of the main tong 11 and the main tong head 22 realizes the grabbing of the seamless sleeve placed in the horizontal direction and the fastening and the breaking operation in the horizontal direction.

Illustratively, when the screwing operation is carried out, the reversing valve 23 is operated, so that the back-up tong first tong head 17, the back-up tong second tong head 18 and the back-up tong third tong head 19 clamp and stabilize the pipe body of the seamless sleeve; the main tong head 22 locks the seamless sleeve coupling, and then continuously rotates under the driving of hydraulic pressure provided by the hydraulic screwing main back tong assembly 3, so as to complete the fastening and the unscrewing operation with a rated torque value.

In the screwing operation, the posture of the seamless casing is fixed by the back-up tong 12, so that the main tong head 22 of the main tong 11 cannot fall off in the process of locking the seamless casing coupling and continuously rotating. The centrifugal force generated when the main tong head rotates is transmitted to the ground through the 4 supporting legs of the support, and is balanced by the reaction force of the ground.

Illustratively, when the make-up operation is completed, the reversing valve 23 is operated to cause the main tong 11 and the back-up tong 12 to loosen the seamless casing.

In an alternative embodiment, the hydraulic make-up system 1 is operated to the appropriate working position, with one end of the high pressure hose 4 connected to the hydraulic power station 2 and the other end connected to the hydraulic make-up main back-up tong assembly 3. And operating the vehicle-mounted suspension arm 10 by using the indoor crane operating platform 8 to move the hydraulic screwing main back-up tong assembly 3 to the position to be connected of the seamless sleeve. The distance between the back-up tong 12 and the main tong 11 is adjusted by moving the back-up tong 12, so that the back-up tong 12 is positioned at the position capable of grabbing the seamless casing pipe body and the main tong 11 is positioned at the position capable of grabbing the seamless casing coupling. The hydraulic power station 2 is supplied with power through the diesel self-generating equipment 9. The hydraulic power station 2 is operated to provide driving force for the hydraulic screwing main back-up tong assembly 3. The reversing valve 23 is operated, so that the back-up tong 12 of the hydraulic screwing main back-up tong assembly 3 grabs the seamless casing pipe body, and the main tong 11 grabs the seamless casing coupling. The main tong head 22 locks the coupling of the seamless casing pipe under the driving of hydraulic pressure and rotates continuously to complete the fastening and the unfastening operation. According to different construction requirements of seamless sleeves with different diameters, the hydraulic pressure output by the hydraulic power station 2 is adjusted, so that the torque value converted by the system hydraulic meter 5 meets the rated torque value required by the screwing operation. After the screwing operation is finished, the reversing valve 3 is operated, the hydraulic screwing main back-up tong assembly 3 loosens the seamless sleeve, the vehicle-mounted suspension arm 10 is operated to recover the hydraulic screwing main back-up tong assembly 3 to the part to be connected of the next section of seamless sleeve, and the screwing operation is continued. After all screwing operations are finished, the vehicle-mounted suspension arm 10 is operated to recover the hydraulic screwing main back-up tong assembly 3 to the crawler-type chassis 6, and the hydraulic power station 2 is operated to recover the hydraulic medium. And recovering the high-pressure rubber pipe 4, storing and hanging the high-pressure rubber pipe at the rear side of the hydraulic power station, and operating the crawler-type chassis 6 to move to the next construction position to continue screwing operation.

The embodiment of the utility model provides a main back-up tong assembly is twisted up to hydraulic pressure utilizes its annular design of downward opening type to realize snatching to the seamless sleeve pipe that the level was placed. The back-up tong of the hydraulic screwing main back-up tong assembly grabs the pipe body of the seamless sleeve, so that the posture of the seamless sleeve during operation is stabilized; the main tong of this main back-up tong assembly is twisted up to hydraulic pressure snatchs seamless sheathed tube coupling, locks seamless sheathed tube coupling and continuous rotation through main tong binding clip and has realized the operation of screwing up and breaking out of level direction. The torque value of this hydraulic pressure screwing up main back-up tong assembly during operation is monitored by the system pressure gauge, has guaranteed that the torque value of output is the rated torque value when seamless sleeve pipe is screwed up and is broken out the operation to stable output has guaranteed construction quality.

To sum up, the embodiment of the utility model provides a system is twisted up to hydraulic pressure has realized that hydraulic pressure is twisted up the removal operation of system under the field environment in the construction of oil field ground engineering. The embodiment of the utility model provides a main back-up tong assembly is twisted up to hydraulic pressure has realized the operation of twisting out and breaking out of thread of seamless sleeve pipe horizontal direction, has filled the trade blank. In practical engineering application, the time spent by screwing operation of the hydraulic screwing system is saved by 60 percent compared with manual screwing, and the manual and vehicle bench cost is saved.

The above description is only an optional embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A hydraulic screwing system is characterized by comprising a crawler-type mobile working power station (1), a hydraulic power station (2), a hydraulic screwing main back-up tong assembly (3), a high-pressure rubber pipe (4) and a system pressure gauge (5);

the hydraulic power station (2) is arranged on the crawler-type mobile working power station (1); the hydraulic screwing main back-up tong assembly (3) is placed on the crawler-type mobile working power station (1);

one end of the high-pressure rubber pipe (4) is connected with the hydraulic power station (2), and the other end of the high-pressure rubber pipe (4) is connected with the hydraulic screwing main back-up tong assembly (3); and the system pressure gauge (5) is arranged on the hydraulic screwing main back-up tong assembly (3).

2. A hydraulic screwing system according to claim 1, characterized in that said crawler mobile work station (1) comprises a crawler chassis (6), a cab (7), an indoor crane operating platform (8), diesel self-generating equipment (9) and a vehicle-mounted suspension arm (10);

the cab (7), the diesel self-generating equipment (9) and the vehicle-mounted suspension arm (10) are arranged on the crawler-type chassis (6);

the indoor crane operating platform (8) is arranged in the cab (7);

the hydraulic power station (2) is arranged on the crawler-type chassis (6); the hydraulic screwing main back-up tong assembly (3) is placed on the crawler-type chassis (6).

3. A hydraulic make-up system according to any one of claims 1 to 2, wherein the hydraulic make-up main back-up tong assembly (3) comprises main tongs (11), back-up tongs (12) and a bracket (13);

the back tongs (12) are arranged in the middle of the bracket (13);

the main clamp (11) is arranged on one side of the bracket (13);

and a baffle is arranged on the other side of the bracket (13).

4. A hydraulic turnup system according to claim 3, wherein the back-up tong (12) comprises a back-up tong housing (14), a back-up tong first hydraulic link (15), a back-up tong second hydraulic link (16), a back-up tong first tong head (17), a back-up tong second tong head (18), a back-up tong third tong head (19);

the top of the back-up tong shell (14) is connected with a beam at the top of the bracket (13);

the back-up tong first hydraulic connecting rod (15) and the back-up tong second hydraulic connecting rod (16) are respectively arranged at two sides of the back-up tong shell (14);

the back-up tong first tong head (17) is arranged at the center of the bottom of the back-up tong shell (14);

the back-up tong second tong head (18) is arranged at the tail end of an action arm of the back-up tong first hydraulic connecting rod (15); and the third tong head (19) of the back tong is arranged at the tail end of the action arm of the second hydraulic connecting rod (16) of the back tong.

5. A hydraulic make-up system according to claim 3, wherein the main tong (11) comprises a main tong housing (20), a cylindrical pin (21), a main tong head (22) and a reversing valve (23);

the top of the main tong shell (20) is connected with a frame at the top of the bracket (13), and two sides of the main tong shell (20) are fixed on the frames at two sides of the bracket (13) through the cylindrical pins (21);

the main tong head (22) is arranged on the main tong shell (20);

the reversing valve (23) is mounted on the main tong housing (20).

6. A hydraulic screwing system according to claim 4, characterised in that the back-up tong housing (14) projects, at the shoulders, outwards and at the bottom, presents a dovetail-like recess.

7. A hydraulic make-up system according to claim 4 wherein the back-up tong first tong head (17) is mounted at an intermediate position in a dovetail-like recess in the bottom of the back-up tong housing (14).

8. A hydraulic make-up system according to claim 5 wherein the main tong housing (20) has a downwardly opening annular indentation in its lower portion.

9. A hydraulic make-up system according to claim 5 wherein the main tong head (22) is a downwardly opening ring-like structure.

10. A hydraulic make-up system according to claim 5, characterised in that the centre of the main tong head (22) coincides with the centre of the lower annular gap of the main tong housing (20).

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