Hydraulic system and equipment for combined construction of rotary drilling rig and pipe rolling machine

Abstract

A hydraulic system for combined construction of a rotary drilling rig and a pipe rolling machine, comprising a first switching valve, a second switching valve, a main oil circuit and a pilot oil circuit. The first switching valve is connected to the main oil circuit, the pipe rolling machine and a first traveling motor; the second switching valve is connected to the main oil circuit, the pipe rolling machine and a second traveling motor. When the first switching valve is in a first working position, hydraulic oil of the main oil circuit is communicated to the first traveling motor, and when the first switching valve is in a second working position, hydraulic oil of the main oil circuit is communicated to the pipe rolling machine. When the second switching valve is in the first working position, hydraulic oil of the main oil circuit is communicated to the second traveling motor, and when the second switching valve is in the second working position, hydraulic oil of the main oil circuit is communicated to the pipe rolling machine. The first pilot control end of the first switching valve and the second pilot control end of the second switching valve are both connected to the pilot oil circuit to control the first switching valve and the second switching valve to switch between the first working position and the second working position.

Description

Technical Field

[0001] This invention relates to the technical field of engineering machinery, and in particular to a hydraulic system and equipment for combined construction of a rotary drilling rig and a pipe rolling machine. Background Technology

[0002] Foundation piling is an essential part of any major construction project. Due to varying geological conditions, reliable construction techniques and machinery must be selected based on geological survey data.

[0003] Generally, when the strata are relatively stable and the pile can maintain its shape through its own friction, mud slurry is used for borehole wall protection. Mud slurries of different specific gravities are used to balance the lateral earth pressure on the groundwater and the borehole wall, preventing collapse. However, in many special strata, mud slurry cannot be used for wall protection for various reasons. Typical examples include various backfill layers, soft soil bases, karst caverns, and quicksand layers. In these conditions, the mud slurry cannot effectively remain in the borehole to protect the wall, hindering successful pile foundation construction. Solving this problem requires the use of full-casing construction technology. By supporting the borehole wall with casing, the drilling and pile construction of large-diameter underground concrete pile foundations can be completed. This technology is currently widely used specialized engineering pile foundation construction machinery.

[0004] Full casing construction technology involves connecting a casing rolling machine to a rotary drilling rig or other engineering machinery. Using the rig as a fixed point of gravity, the casing of the desired dimensions is clamped in the casing rolling machine's jaws. A hydraulic system drives each hydraulic cylinder on the machine to control the stroke and angle, performing a semi-rotation downward pressing of the steel pipe (casing) deep into the ground. During the rolling process, soil is removed from the casing hole until the required pile depth is achieved. By combining the casing rolling machine with different auxiliary equipment, operations that are impossible with traditional techniques can be completed, such as full-wall drilling, semi-wall drilling, various special pile constructions, and the removal of underground abandoned piles.

[0005] Pipe-rolling machines typically use independent hydraulic pump stations during construction, which not only increases procurement costs but also makes the pipelines and cables between the hydraulic pump station and the pipe-rolling machine prone to damage, resulting in low equipment reliability during construction. Damage to the hydraulic pipelines can easily lead to hydraulic system failures, leading to high maintenance costs. To address this issue, existing technology has developed a method that allows the pipe-rolling machine to utilize the idle hydraulic system of the traveling mechanism of a rotary drilling rig or other construction machinery used in conjunction with it during construction. For example, in the pipe-rolling machine and construction machinery joint construction device disclosed in Chinese Patent Application No. "201420394352.5", the hydraulic pipeline of the pipe-rolling machine's hydraulic system is connected to the hydraulic pipeline of the traveling mechanism's hydraulic system of the construction machinery through an oil circuit switching valve, thus utilizing the idle hydraulic system of the traveling mechanism to provide power to the pipe-rolling machine.

[0006] likeFigure 1 As shown, the hydraulic system described above is generally controlled by four switching valve groups 1a working in tandem to switch the working oil circuits of the rotary drilling rig and the pipe-rolling machine. When the hydraulic system of the rotary drilling rig is connected to the pipe-rolling machine for operation, the travel motor does not move. Therefore, pressurized oil is taken from the travel oil circuit of the hydraulic system and supplied to the pipe-rolling machine. There are a total of four oil circuits for the left and right travel motors (oil inlets A and B, oil returnlets A and B). The switching valve group 1a includes a first switching valve 2a and a second switching valve 3a. After the first switching valve 2a switches, the pressurized oil pushes the second switching valve 3a to switch. At this time, the pressurized oil at the corresponding oil inlet is supplied to the pipe-rolling machine after switching.

[0007] After the second switching valve 3a is switched, pressure oil is needed to push the valve core of the second switching valve 3a. If the return oil pressure is not high, there is a chance that the switching will fail. At this time, the large flow of return oil will impact the drain line and cause the line to leak. Summary of the Invention

[0008] The purpose of this invention is to provide a hydraulic system and equipment for combined rotary drilling rig and pipe rolling machine construction, in order to solve the above-mentioned technical problems.

[0009] This invention provides a hydraulic system for combined operation of a rotary drilling rig and a pipe-rolling machine, comprising a first switching valve, a second switching valve, a main oil circuit, and a pilot oil circuit; the first switching valve is connected to the main oil circuit via a first pipeline, to the pipe-rolling machine via a first working pipeline and a second working pipeline, and to the first travel motor of the rotary drilling rig via a third working pipeline and a fourth working pipeline; the second switching valve is connected to the main oil circuit via a second pipeline, to the pipe-rolling machine via a fifth working pipeline and a sixth working pipeline, and to the second travel motor of the rotary drilling rig via a seventh working pipeline and an eighth working pipeline;

[0010] Both the first switching valve and the second switching valve have a first working position and a second working position; when the first switching valve is in the first working position, the hydraulic oil in the main oil circuit is connected to the first traveling motor, and when the first switching valve is in the second working position, the hydraulic oil in the main oil circuit is connected to the pipe rolling machine; when the second switching valve is in the first working position, the hydraulic oil in the main oil circuit is connected to the second traveling motor, and when the second switching valve is in the second working position, the hydraulic oil in the main oil circuit is connected to the pipe rolling machine.

[0011] The first switching valve has a first hydraulic control terminal, and the second switching valve has a second hydraulic control terminal. Both the first hydraulic control terminal and the second hydraulic control terminal are connected to the pilot oil circuit, which can control the first switching valve and the second switching valve to switch between a first working position and a second working position.

[0012] Furthermore, both the first switching valve and the second switching valve are two-position six-way directional valves; the first switching valve has a first oil inlet P1, a first oil return port T1, a first working oil port A1, a second working oil port B1, a third working oil port A2, and a fourth working oil port B2. The first oil inlet P1 is connected to the first pipeline, the first oil return port T1 is connected to the return oil tank through the first return pipeline, the first working oil port A1 is connected to the first working pipeline, the second working oil port B1 is connected to the second working pipeline, the third working oil port A2 is connected to the third working pipeline, and the fourth working oil port B2 is connected to the fourth working pipeline.

[0013] The second switching valve has a second oil inlet P2, a second oil return port T2, a fifth working oil port A3, a sixth working oil port B3, a seventh working oil port A4, and an eighth working oil port B4. The second oil inlet P2 is connected to the second pipeline, the second oil return port T2 is connected to the return oil tank through the second return pipeline, the fifth working oil port A3 is connected to the fifth working pipeline, the sixth working oil port B3 is connected to the sixth working pipeline, the seventh working oil port A4 is connected to the seventh working pipeline, and the eighth working oil port B4 is connected to the eighth working pipeline.

[0014] When the first switching valve is in the first working position, the first oil inlet P1 is connected to the third working oil inlet A2, and the fourth working oil inlet B2 is connected to the first return oil inlet T1. When the first switching valve is in the second working position, the first oil inlet P1 is connected to the first working oil inlet A1, and the second working oil inlet B1 is connected to the first return oil inlet T1. When the second switching valve is in the first working position, the second oil inlet P2 is connected to the seventh working oil inlet A4, and the eighth working oil inlet B4 is connected to the second return oil inlet T2. When the second switching valve is in the second working position, the second oil inlet P1 is connected to the fifth working oil inlet A3, and the sixth working oil inlet B3 is connected to the second return oil inlet T2.

[0015] Furthermore, the first working position of the first switching valve and the second switching valve is the normal position, and when the pilot oil circuit is open, the first switching valve and the second switching valve can be controlled to switch from the first working position to the second working position.

[0016] Furthermore, the main oil line is equipped with a main pump and a main valve connected to the main pump, and both the first pipeline and the second pipeline are connected to the main valve; the pilot oil line is equipped with a pilot pump, a pilot logic valve group and a control valve group connected in sequence, and the working port A of the pilot logic valve group is connected to the inlet of the control valve group through a first pilot pipeline; the control valve group has a first working port A1 and a second working port B2, the first working port A1 of the control valve group is connected to the hydraulic control terminal of the main valve through a second pilot pipeline, and the second working port B2 of the control valve group is connected to the first hydraulic control terminal of the first switching valve and the second hydraulic control terminal of the second switching valve through a third pilot pipeline.

[0017] Furthermore, the control valve assembly includes a first control valve and a second control valve. The first working port A1 and the third working port B1 of the control valve assembly are disposed on the first control valve, and the second working port B2 of the control valve assembly is disposed on the second control valve. One end of the first pilot line is divided into two paths and connected to the oil inlets of the first control valve and the second control valve, respectively.

[0018] Furthermore, the main oil line is equipped with a main pump and a main valve connected to the main pump, and both the first pipeline and the second pipeline are connected to the main valve; the pilot oil line is equipped with a pilot pump, a pilot logic valve group and a control valve group connected in sequence, and the control valve group includes a control valve; the working port A of the pilot logic valve group is connected to the inlet P of the control valve through a first pilot pipeline; the control valve has a first working port A1, and the first working port A1 of the control valve is connected to the hydraulic control terminal of the main valve through a second pilot pipeline, and a third pilot pipeline is also connected to the second pilot pipeline, which is connected to the first hydraulic control terminal of the first switching valve and the second hydraulic control terminal of the second switching valve.

[0019] Furthermore, the pilot oil circuit is also provided with a left travel foot valve and a right travel foot valve. The control valve group has a third working oil port B1. The third working oil port B1 of the control valve group is connected to the oil inlet P of the left travel foot valve and the oil inlet P of the right travel foot valve through a fourth pilot oil circuit. The working oil port A of the left travel foot valve and the working oil port A of the right travel foot valve are connected to the hydraulic control end of the main valve.

[0020] Furthermore, the rotary drilling rig is equipped with a central rotary joint, and the first pipeline, the second pipeline and the third pilot pipeline all form oil circuits through the central rotary joint.

[0021] Furthermore, the tube rolling machine is equipped with a tube rolling machine connector, and the first working pipeline, the second working pipeline, the fifth working pipeline and the sixth working pipeline all form an oil circuit with the actuator on the tube rolling machine via the tube rolling machine connector.

[0022] The present invention also provides a device for combined construction of a rotary drilling rig and a pipe rolling machine, wherein the device is equipped with the aforementioned hydraulic system for combined construction of a rotary drilling rig and a pipe rolling machine.

[0023] The first and second switching valves in the hydraulic system of the rotary drilling rig and pipe rolling machine combined construction provided by the present invention are controlled by a pilot oil circuit independent of the main oil circuit to switch the valve core. This avoids the problem of switching failure caused by the need to use the pressure oil of the main oil circuit to push the valve core of the switching valve, and also avoids the problem of pipeline leakage caused by the impact of large flow of return oil on the drain oil pipeline.

[0024] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make other objects, features and advantages of the hydraulic system and equipment for combined rotary drilling rig and pipe rolling machine construction of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] Figure 1 A schematic diagram of the hydraulic system of an existing pipe rolling machine combined with construction machinery.

[0026] Figure 2 A schematic diagram of the hydraulic system for combined rotary drilling rig and pipe rolling machine construction according to the first embodiment of the present invention.

[0027] Figure 3 A partial structural schematic diagram of the hydraulic system for combined rotary drilling rig and pipe rolling machine construction according to the first embodiment of the present invention.

[0028] Figure 4 A schematic diagram of the hydraulic system for combined rotary drilling rig and pipe rolling machine construction according to the second embodiment of the present invention. Detailed Implementation

[0029] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation methods, structure, features, and effects of the hydraulic system and equipment for combined rotary drilling rig and pipe rolling machine construction proposed according to the present invention:

[0030] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of preferred embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding can be gained of the technical means and effects adopted by the present invention to achieve its intended purpose. However, the accompanying drawings are for reference and illustration only and are not intended to limit the present invention.

[0031] [First Embodiment]

[0032] Figure 2 A schematic diagram of the hydraulic system for combined rotary drilling rig and pipe rolling machine construction according to the first embodiment of the present invention. Figure 3 Please refer to the partial structural diagram of the hydraulic system for combined rotary drilling rig and pipe rolling machine construction according to the first embodiment of the present invention. Figure 2 and Figure 3 The hydraulic system for combined rotary drilling rig and pipe-rolling machine construction includes a first switching valve 10, a second switching valve 20, a main oil circuit 30, and a pilot oil circuit 40. The first switching valve 10 is connected to the main oil circuit 30 via a first pipeline 11, to the pipe-rolling machine via a first working pipeline 13 and a second working pipeline 14, and to the first travel motor 51 of the rotary drilling rig via a third working pipeline 15 and a fourth working pipeline 16. The second switching valve 10 is connected to the main oil circuit 30 via a second pipeline 21, to the pipe-rolling machine via a fifth working pipeline 23 and a sixth working pipeline 24, and to the second travel motor 52 of the rotary drilling rig via a seventh working pipeline 25 and an eighth working pipeline 26.

[0033] Both the first switching valve 10 and the second switching valve 20 have a first working position and a second working position. When the first switching valve 10 is in the first working position, the hydraulic oil in the main oil circuit 30 is connected to the first travel motor 51. When the first switching valve 10 is in the second working position, the hydraulic oil in the main oil circuit 30 is connected to the pipe-rolling machine. When the second switching valve 20 is in the first working position, the hydraulic oil in the main oil circuit 30 is connected to the second travel motor 52. When the second switching valve 20 is in the second working position, the hydraulic oil in the main oil circuit 30 is connected to the pipe-rolling machine. When the hydraulic oil in the main oil circuit 30 is connected to the first travel motor 51 or the second travel motor 52, the hydraulic control system starts the travel mechanism of the rotary drilling rig to control the rotary drilling rig to travel. When the hydraulic oil in the main oil circuit 30 is connected to the pipe-rolling machine, the hydraulic control system provides power to the pipe-rolling machine to control the various actuators on the pipe-rolling machine to perform corresponding actions.

[0034] The first switching valve 10 has a first hydraulic control terminal 101, and the second switching valve 20 has a second hydraulic control terminal 201. Both the first hydraulic control terminal 101 and the second hydraulic control terminal 201 are connected to the pilot oil circuit 40, which can control the switching of the first switching valve 10 and the second switching valve 20 between a first working position and a second working position. In the hydraulic system of the rotary drilling rig and pipe rolling machine of the present invention, the first switching valve 10 and the second switching valve 20 are controlled by the pilot oil circuit 40, which is independent of the main oil circuit 30, to switch the valve core. This avoids the problem of switching failure caused by the need to use the pressure oil of the main oil circuit 30 to push the valve core of the switching valve, and also avoids the problem of pipeline leakage caused by the impact of a large flow of return oil on the drain pipeline.

[0035] In this embodiment, as Figure 2As shown, both the first switching valve 10 and the second switching valve 20 are two-position six-way directional valves. The first switching valve 10 has a first inlet port P1, a first return port T1, a first working port A1, a second working port B1, a third working port A2, and a fourth working port B2. The first inlet port P1 is connected to the first pipeline 11, the first return port T1 is connected to the return oil tank via the first return pipeline 12, the first working port A1 is connected to the first working pipeline 13, the second working port B1 is connected to the second working pipeline 14, the third working port A2 is connected to the third working pipeline 15, and the fourth working port B2 is connected to the fourth working pipeline 16.

[0036] The second switching valve 20 has a second oil inlet P2, a second oil return port T2, a fifth working oil port A3, a sixth working oil port B3, a seventh working oil port A4, and an eighth working oil port B4. The second oil inlet P2 is connected to the second pipeline 21, the second oil return port T2 is connected to the return oil tank through the second return pipeline 22, the fifth working oil port A3 is connected to the fifth working pipeline 13, the sixth working oil port B3 is connected to the sixth working pipeline 24, the seventh working oil port A4 is connected to the seventh working pipeline 25, and the eighth working oil port B4 is connected to the eighth working pipeline 26.

[0037] The first working position of the first switching valve 10 and the second switching valve 20 is the normal position. When the pilot oil circuit 40 is turned on, the first switching valve 10 and the second switching valve 20 can be controlled to switch from the first working position to the second working position.

[0038] Furthermore, the first travel motor 51 includes two motors: left travel A and left travel B; the second travel motor 52 includes two motors: right travel A and right travel B.

[0039] When the first switching valve 10 is in the first working position, the first oil inlet P1 is connected to the third working oil inlet A2, and the fourth working oil inlet B2 is connected to the first return oil inlet T1. The hydraulic oil in the first pipeline 11 is sent to the first travel motor 51 after passing through the first oil inlet P1 and the third working oil inlet A2 to the third working pipeline 15. The hydraulic oil passes through the left travel motor A and the left travel motor B in sequence. The hydraulic oil returning from the first travel motor 51 is sent through the fourth working pipeline 16, the fourth working oil inlet B2 and the first return oil inlet T1 to the first return pipeline 12 and connected to the return oil tank.

[0040] When the first switching valve 10 is in the second working position, the first oil inlet P1 is connected to the first working oil inlet A1, and the second working oil inlet B1 is connected to the first return oil inlet T1. The hydraulic oil in the first pipeline 11 is sent to the first working pipeline 13 through the first oil inlet P1 and the first working oil inlet A1 and then to the pipe rolling machine. The hydraulic oil returned by the pipe rolling machine is sent to the first return pipeline 12 through the fourth working pipeline 16, the fourth working oil inlet B2 and the first return oil inlet T1, and then connected to the return oil tank.

[0041] When the second switching valve 20 is in the first working position, the second oil inlet P2 is connected to the seventh working oil inlet A4, and the eighth working oil inlet B4 is connected to the second return oil inlet T2. The hydraulic oil in the second pipeline 21 is sent to the second travel motor 52 after passing through the second oil inlet P2 and the seventh working oil inlet A4 to the seventh working pipeline 25. The hydraulic oil passes through the right travel motor A and the right travel motor B in sequence. The hydraulic oil returning from the second travel motor 52 is connected to the return oil tank through the eighth working pipeline 26, the eighth working oil inlet B4 and the second return oil inlet T2 to the second return pipeline 22.

[0042] When the second switching valve 20 is in the second working position, the second oil inlet P1 is connected to the fifth working oil inlet A3, and the sixth working oil inlet B3 is connected to the second return oil inlet T2. The hydraulic oil in the second pipeline 21 is sent to the fifth working pipeline 23 through the second oil inlet P2 and the fifth working oil inlet A3, and then sent to the pipe rolling machine. The hydraulic oil returned by the pipe rolling machine is sent to the second return pipeline 22 through the sixth working pipeline 24, the sixth working oil inlet B3, and the second return oil inlet T2, and connected to the return oil tank.

[0043] In this embodiment, the main oil circuit 30 is provided with a main pump 31 and a main valve 32 connected to the main pump 31. The first pipeline 11 and the second pipeline 21 are both connected to the main valve 32. The main valve 32 is provided with two working oil ports. The first pipeline 11 and the second pipeline 21 are each connected to one working oil port on the main valve 32.

[0044] The pilot oil circuit 40 is equipped with a pilot pump 41, a pilot logic valve group 42, and a control valve group 43 connected in sequence. The working port A of the pilot logic valve group 42 is connected to the inlet of the control valve group 43 through a first pilot line 401. The control valve group 43 has a first working port A1 and a second working port B2. The first working port A1 of the control valve group 43 is connected to the two hydraulic control terminals of the main valve 32 through a second pilot line 402. The second working port B2 of the control valve group 43 is connected to the first hydraulic control terminal 101 of the first switching valve 10 and the second hydraulic control terminal 201 of the second switching valve 20 through a third pilot line 403. When the pilot logic valve group 42 conducts pilot oil through the third pilot line 403, the pilot oil enters the first hydraulic control terminal 101 of the first switching valve 10 and the second hydraulic control terminal 201 of the second switching valve 20, controlling the movement of the first switching valve 10 and the second switching valve 20 to the second working position.

[0045] Furthermore, the control valve assembly 43 includes a first control valve 431 and a second control valve 432. The first working port A1 and the third working port B1 of the control valve assembly 43 are disposed on the first control valve 431, and the second working port B2 of the control valve assembly 43 is disposed on the second control valve 432. One end of the first pilot line 401 is divided into two paths and connected to the oil inlets of the first control valve 431 and the second control valve 432 respectively.

[0046] Furthermore, the pilot oil circuit 40 is also equipped with a left travel foot valve 45 and a right travel foot valve 46. The control valve group 43 has a third working oil port B1. The third working oil port B1 of the control valve group 43 is connected to the oil inlet P of the left travel foot valve 45 and the oil inlet P of the right travel foot valve 46 through the fourth pilot oil circuit 404. The working oil ports A of the left travel foot valve 45 and the right travel foot valve 46 are connected to the two hydraulic control terminals of the main valve 32.

[0047] Furthermore, the rotary drilling rig is equipped with a central rotary joint 53, through which the first pipeline 11, the second pipeline 21, and the third pilot pipeline 403 form oil circuits. The first return pipeline 12 and the second return pipeline 22 are both connected to the central rotary joint 53 and then connected to the return oil tank.

[0048] Furthermore, the tube rolling machine is equipped with a tube rolling machine connector 60. The first working pipe 13, the second working pipe 14, the fifth working pipe 23, and the sixth working pipe 24 all connect to the actuators on the tube rolling machine via the tube rolling machine connector 60 to form oil circuits. The actuators on the tube rolling machine include tube rolling cylinders, pressure pulling cylinders, clamping cylinders, etc. The specific connection method can be set as needed to enable each actuator to perform corresponding actions.

[0049] [Second Embodiment]

[0050] like Figure 4 As shown, the hydraulic system for combined rotary drilling rig and pipe rolling machine construction in this embodiment differs from the first embodiment in that the control valve group 43 only includes the control valve 44. The working port A of the pilot logic valve group 42 is connected to the inlet port P of the control valve 44 through the first pilot line 401. The control valve 44 has a first working port A1, which is connected to the two hydraulic control terminals of the main valve 32 through the second pilot line 402. A third pilot line 403 is also connected to the second pilot line 402, which is connected to the first hydraulic control terminal 101 of the first switching valve 10 and the second hydraulic control terminal 201 of the second switching valve 20. That is, the pilot oil delivered from the first working port A1 of the control valve 44 is delivered to the two hydraulic control terminals of the main valve 32, the first hydraulic control terminal 101 of the first switching valve 10, and the second hydraulic control terminal 201 of the second switching valve 20.

[0051] This invention also relates to a device for combined rotary drilling rig and pipe rolling machine construction, wherein the device is equipped with the aforementioned hydraulic system for combined rotary drilling rig and pipe rolling machine construction. The structures of the rotary drilling rig and pipe rolling machine are well known to those skilled in the art and will not be described in detail here.

[0052] The hydraulic system and equipment for combined rotary drilling rig and pipe rolling machine construction provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A hydraulic system for combined rotary drilling rig and pipe rolling machine construction, characterized in that, It includes a first switching valve (10), a second switching valve (20), a main oil circuit (30), and a pilot oil circuit (40); the first switching valve (10) is connected to the main oil circuit (30) through a first pipeline (11), to the pipe rolling machine through a first working pipeline (13) and a second working pipeline (14), and to the first travel motor (51) of the rotary drilling rig through a third working pipeline (15) and a fourth working pipeline (16); the second switching valve (20) is connected to the main oil circuit (30) through a second pipeline (21), to the pipe rolling machine through a fifth working pipeline (23) and a sixth working pipeline (24), and to the second travel motor (52) of the rotary drilling rig through a seventh working pipeline (25) and an eighth working pipeline (26); Both the first switching valve (10) and the second switching valve (20) have a first working position and a second working position; when the first switching valve (10) is in the first working position, the hydraulic oil of the main oil circuit (30) is connected to the first traveling motor (51); when the first switching valve (10) is in the second working position, the hydraulic oil of the main oil circuit (30) is connected to the pipe rolling machine; when the second switching valve (20) is in the first working position, the hydraulic oil of the main oil circuit (30) is connected to the second traveling motor (52); when the second switching valve (20) is in the second working position, the hydraulic oil of the main oil circuit (30) is connected to the pipe rolling machine. The first switching valve (10) has a first hydraulic control terminal (101), and the second switching valve (20) has a second hydraulic control terminal (201). Both the first hydraulic control terminal (101) and the second hydraulic control terminal (201) are connected to the pilot oil circuit (40). The pilot oil circuit (40) can control the first switching valve (10) and the second switching valve (20) to switch between a first working position and a second working position. Both the first switching valve (10) and the second switching valve (20) are two-position six-way directional valves; the first switching valve (10) has a first oil inlet P1, a first oil return port T1, a first working oil port A1, a second working oil port B1, a third working oil port A2 and a fourth working oil port B2. The first oil inlet P1 is connected to the first pipeline (11), the first oil return port T1 is connected to the oil return tank through the first return pipeline (12), the first working oil port A1 is connected to the first working pipeline (13), the second working oil port B1 is connected to the second working pipeline (14), the third working oil port A2 is connected to the third working pipeline (15), and the fourth working oil port B2 is connected to the fourth working pipeline (16). The second switching valve (20) has a second oil inlet P2, a second oil return port T2, a fifth working oil port A3, a sixth working oil port B3, a seventh working oil port A4 and an eighth working oil port B4. The second oil inlet P2 is connected to the second pipeline (21). The second oil return port T2 is connected to the return oil tank through the second return pipeline (22). The fifth working oil port A3 is connected to the fifth working pipeline (23). The sixth working oil port B3 is connected to the sixth working pipeline (24). The seventh working oil port A4 is connected to the seventh working pipeline (25). The eighth working oil port B4 is connected to the eighth working pipeline (26).

2. The hydraulic system for combined rotary drilling rig and pipe rolling machine construction according to claim 1, characterized in that, When the first switching valve (10) is in the first working position, the first oil inlet P1 is connected to the third working oil inlet A2, and the fourth working oil inlet B2 is connected to the first return oil inlet T1. When the first switching valve (10) is in the second working position, the first oil inlet P1 is connected to the first working oil inlet A1, and the second working oil inlet B1 is connected to the first return oil inlet T1. When the second switching valve (20) is in the first working position, the second oil inlet P2 is connected to the seventh working oil inlet A4, and the eighth working oil inlet B4 is connected to the second return oil inlet T2. When the second switching valve (20) is in the second working position, the second oil inlet P1 is connected to the fifth working oil inlet A3, and the sixth working oil inlet B3 is connected to the second return oil inlet T2.

3. The hydraulic system for combined rotary drilling rig and pipe rolling machine construction according to claim 2, characterized in that, The first working position of the first switching valve (10) and the second switching valve (20) is the normal position. When the pilot oil circuit (40) is turned on, the first switching valve (10) and the second switching valve (20) can be controlled to switch from the first working position to the second working position.

4. The hydraulic system for combined rotary drilling rig and pipe rolling machine construction according to claim 2, characterized in that, The main oil circuit (30) is equipped with a main pump (31) and a main valve (32) connected to the main pump (31). The first pipeline (11) and the second pipeline (21) are both connected to the main valve (32). The pilot oil circuit (40) is provided with a pilot pump (41), a pilot logic valve group (42) and a control valve group (43) connected in sequence. The working port A of the pilot logic valve group (42) is connected to the inlet of the control valve group (43) through a first pilot line (401). The control valve group (43) has a first working port A1 and a second working port B2. The first working port A1 of the control valve group (43) is connected to the hydraulic control terminal of the main valve (32) through a second pilot line (402). The second working port B2 of the control valve group (43) is connected to the first hydraulic control terminal (101) of the first switching valve (10) and the second hydraulic control terminal (201) of the second switching valve (20) through a third pilot line (403).

5. The hydraulic system for combined rotary drilling rig and pipe rolling machine construction according to claim 4, characterized in that, The control valve assembly (43) includes a first control valve (431) and a second control valve (432). The first working port A1 and the third working port B1 of the control valve assembly (43) are disposed on the first control valve (431), and the second working port B2 of the control valve assembly (43) is disposed on the second control valve (432). One end of the first pilot line (401) is divided into two paths and connected to the inlet ports of the first control valve (431) and the second control valve (432) respectively.

6. The hydraulic system for combined rotary drilling rig and pipe rolling machine construction according to claim 2, characterized in that, The main oil circuit (30) is equipped with a main pump (31) and a main valve (32) connected to the main pump (31). The first pipeline (11) and the second pipeline (21) are both connected to the main valve (32). The pilot oil circuit (40) is provided with a pilot pump (41), a pilot logic valve group (42) and a control valve group (43) connected in sequence. The control valve group (43) includes a control valve (44). The working port A of the pilot logic valve group (42) is connected to the inlet port P of the control valve (44) through a first pilot line (401). The control valve (44) has a first working port A1. The first working port A1 of the control valve (44) is connected to the hydraulic control terminal of the main valve (32) through a second pilot line (402). A third pilot line (403) is also connected to the second pilot line (402). The third pilot line (403) is connected to the first hydraulic control terminal (101) of the first switching valve (10) and the second hydraulic control terminal (201) of the second switching valve (20).

7. The hydraulic system for combined rotary drilling rig and pipe rolling machine construction according to claim 4 or 6, characterized in that, The pilot oil circuit (40) is also provided with a left travel foot valve (45) and a right travel foot valve (46). The control valve group (43) has a third working oil port B1. The third working oil port B1 of the control valve group (43) is connected to the oil inlet P of the left travel foot valve (45) and the oil inlet P of the right travel foot valve (46) through the fourth pilot oil circuit (404). The working oil port A of the left travel foot valve (45) and the working oil port A of the right travel foot valve (46) are connected to the hydraulic control end of the main valve (32).

8. The hydraulic system for combined rotary drilling rig and pipe rolling machine construction according to claim 4 or 6, characterized in that, The rotary drilling rig is equipped with a central rotary joint (53), and the first pipeline (11), the second pipeline (21) and the third pilot pipeline (403) all form oil circuits through the central rotary joint (53).

9. The hydraulic system for combined rotary drilling rig and pipe rolling machine construction according to claim 1, characterized in that, The tube rubbing machine is equipped with a tube rubbing machine connector (60). The first working pipeline (13), the second working pipeline (14), the fifth working pipeline (23) and the sixth working pipeline (24) all form oil circuits with the actuators on the tube rubbing machine via the tube rubbing machine connector (60).

10. A device for combined rotary drilling rig and pipe rolling machine construction, characterized in that, The equipment is equipped with a hydraulic system for combined rotary drilling rig and pipe rolling machine construction as described in any one of claims 1 to 9.

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