An acoustic environmentally friendly drilling rig hydraulic system and control method thereof

Abstract

A sound frequency environmental protection drilling rig hydraulic system and control method thereof, for the hydraulic system, two load sensing variable pumps constitute a volumetric speed regulation system, the oil circuit uses a variable pump group composed of two hydraulic load sensing variable pumps to provide oil source, and a motor, oil cylinder, etc. are used as actuators and control valves to form a volumetric speed regulation hydraulic system, the output of the hydraulic load sensing variable pump group is controlled by the shuttle valve through the oil circuit composed of series and parallel connection, and the hydraulic load sensitive proportional reversing valve is controlled by a manual pilot valve. The present invention greatly improves the overall performance of the drilling rig, while meeting the requirements of high-power high-frequency vibration and low-speed high-torque rotary drilling conditions; and automatically adjusts the power output of the hydraulic pump according to load changes, greatly reducing energy consumption; pressure compensation is added on both sides of the proportional valve so that its flow is only affected by the opening gap of the proportional valve, thereby improving the stability of the hydraulic system.

Description

Technical Field

[0001] The present invention relates to a hydraulic system structure for a drilling rig, and in particular to an audio-frequency environmentally friendly drilling rig hydraulic system and a control method thereof, which can enable a power head of the drilling rig to stably operate in high-speed and high-power vibration, rotation and feeding conditions at the same time. Background Art

[0002] The acoustic vibration environmental protection drilling rig uses ultra-high frequency vibration drilling method, does not use mud, and is green and environmentally friendly. It is mainly used in pollution site investigation, environmental monitoring wells, agricultural geological surveys, water-soluble mineral exploration, tailings pond exploration, high-precision engineering surveys, geophysical blasting holes and shallow ground source heat pump holes, etc., to provide strong support for the construction of ecological civilization. At present, the ultra-high frequency vibration power head requires a large amount of fluid supply, and the workload changes greatly during drilling, causing the existing hydraulic system to operate unsteadily, especially when the vibration, rotation, and feeding conditions are running at the same time, there are uncoordinated actions, which makes the stable operation of the power head vibration output frequency and power not guaranteed, seriously affecting the comprehensive drilling efficiency.

[0003] Therefore, how to minimize the impact of load changes and provide higher hydraulic output flow and output power has become a technical problem that urgently needs to be solved in the existing technology. Summary of the invention

[0004] The purpose of the present invention is to provide a hydraulic system for drilling rigs and a control method thereof, which can minimize the influence between various actions of the power head and the influence of load changes. The system can provide higher hydraulic output flow and output power.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] An acoustic environmentally friendly drilling rig hydraulic system, characterized by comprising:

[0007] Oil source circuit, pilot control circuit and flow regulation circuit,

[0008] The oil source circuit includes: the engine drives two or more load-sensing variable pumps connected in series, the load-sensing variable pumps connected in series are merged at the outlet, and are connected in parallel with the overflow valve at the confluence of the pipeline, the oil suction ports of the load-sensing variable pumps connected in series are respectively connected with the oil outlets of the liquid collecting ring, the oil inlet of the liquid collecting ring is connected with the oil outlet of the oil suction filter, the oil inlet of the oil suction filter is directly connected to the oil tank, and the load-sensing port of the load-sensing variable pumps connected in series in the hydraulic system is connected with the middle oil port of the first shuttle valve, thereby forming an oil source circuit of the hydraulic system;

[0009] The pilot control circuit comprises: the oil inlet of the throttle orifice plate is connected to the oil source circuit, the oil outlet is connected to the oil inlet of the fixed value pressure reducing valve, the oil outlet of the fixed value pressure reducing valve is connected to the oil inlets of the first pilot control valve, the second pilot control valve and the third pilot control valve which are respectively connected in parallel, and the overflow valve is connected in parallel to the oil inlets of the first, second and third pilot control valves, and the oil return ports of the first, second and third pilot control valves are directly connected to the oil tank; the control pressure signal ports of the first, second and third pilot control valves are respectively connected to the control pressure signal input ports of the corresponding first, second and third hydraulically controlled three-position four-way reversing proportional valves, thereby forming a hydraulic system pilot control circuit;

[0010] The flow regulating circuit comprises: a first differential pressure reducing valve, a second differential pressure reducing valve and a third differential pressure reducing valve, the oil inlets of which are respectively connected to the oil source circuit, and the oil outlets are respectively connected to the oil inlets of the first hydraulically controlled three-position four-way reversing proportional valve, the second hydraulically controlled three-position four-way reversing proportional valve and the third hydraulically controlled three-position four-way reversing proportional valve, the pressure signal feedback ports of the first, second and third differential pressure reducing valves are respectively connected to the oil inlets of the first, second and third hydraulically controlled three-position four-way reversing proportional valves, and are respectively connected to the oil outlets of the first, second and third hydraulically controlled three-position four-way reversing proportional valves through the second shuttle valve, the third shuttle valve and the fifth shuttle valve, the oil return ports of the first, second and third hydraulically controlled three-position four-way reversing proportional valves are directly connected to the oil tank, two parallel vibration motors are connected to the oil outlet of the first hydraulically controlled three-position four-way reversing proportional valve, the rotary motor is connected to the oil outlet of the second hydraulically controlled three-position four-way reversing proportional valve, and the feed cylinder is connected to the oil outlet of the third hydraulically controlled three-position four-way reversing proportional valve, thereby forming a flow regulating circuit in which each branch of the system is not affected by the load.

[0011] Optionally, the series-connected load-sensing variable displacement pumps include a first load-sensing variable displacement pump and a second load-sensing variable displacement pump connected in series, which merge at an outlet.

[0012] Optionally, it also has load-end pressure protection and a load return oil pipeline oil replenishment circuit. The first one-way relief valve and the second one-way relief valve are respectively connected to the oil outlet of the first hydraulically controlled three-position four-way reversing proportional valve, the third one-way relief valve and the fourth one-way relief valve are respectively connected to the oil outlet of the second hydraulically controlled three-position four-way reversing proportional valve, the fifth one-way relief valve and the sixth one-way relief valve are respectively connected to the oil outlet of the third hydraulically controlled three-position four-way reversing proportional valve, and each oil outlet is directly connected to the oil tank, thereby constituting a load-end pressure protection and a load return oil pipeline oil replenishment circuit.

[0013] Optionally, it also has a vibration motor flushing circuit, the control ports at both ends of the three-position three-way reversing valve and the two upper middle oil inlets are respectively connected to the oil outlet of the first hydraulically controlled three-position four-way reversing proportional valve, the lower middle oil outlet is connected to the oil inlet of the first throttling orifice plate, the oil outlet of the first throttling orifice plate is connected to the upper oil drain ports of the outer casings of the two parallel first and second vibration motors, the hydraulic oil passes through the casings of the first and second vibration motors and directly flows back to the oil tank through the lower oil drain port, thereby forming a vibration motor flushing circuit.

[0014] Optionally, it also has a load sensing circuit, the upper and lower ports of the second shuttle valve, the third shuttle valve and the fifth shuttle valve are respectively connected to the oil outlets of the corresponding first, second and third hydraulically controlled three-position four-way reversing proportional valves, the middle port of the second shuttle valve is connected to the left port of the first shuttle valve, the middle ports of the third shuttle valve and the fifth shuttle valve are connected to the upper and lower ports of the fourth shuttle valve, the middle port of the fourth shuttle valve is connected to the right port of the first shuttle valve, and the middle port of the first shuttle valve is connected to the load sensing ports of the first and second load sensing variable pumps connected in series.

[0015] Optionally, the outlets of the first load-sensing variable displacement pump and the second load-sensing variable displacement pump connected in series meet at the outlet after passing through the first one-way valve and the second one-way valve respectively.

[0016] The present invention further discloses a control method for the above-mentioned acoustic environmentally friendly drilling rig hydraulic system, which is characterized in that:

[0017] In the initial state of the hydraulic system, the first to third pilot control valves are not operated, the control port of the pilot control valve has no pressure output, the corresponding hydraulically controlled three-position four-way proportional valves are in the middle position, that is, closed, the actuators, that is, the parallel vibration motor, rotary motor, and feed cylinder are not in action, the load sensing circuit has no pressure feedback signal, the series load sensing variable pump outputs at the set minimum flow rate, the system as a whole works at a lower flow and pressure state, and the system consumes low power;

[0018] When the first to third pilot control valves are manually operated individually or simultaneously, the corresponding valve cores of the first to third pilot control valves act according to the amplitude and direction of the pilot control valve operating levers, so that the pressure at the control port is output proportionally and the flow direction of the hydraulic oil is controlled, so that the hydraulically controlled three-position four-way reversing proportional valves corresponding to the first to third pilot control valves are opened and reversed according to the set proportion, thereby driving the two vibration motors, the rotary motor 28 and the feed cylinder 35 connected in parallel with the load to work respectively. At the same time, the load sensing feedback oil circuit feeds back the highest load-end pressure in the system to each load sensing variable pump according to the characteristics of the load feedback oil circuit, driving the load variable pump to increase the flow rate. When each differential pressure reducing valve reaches a stable state, the pressure difference between the inlet and outlet of each hydraulically controlled three-position four-way reversing proportional valve is constant, and the hydraulic oil flow is only controlled by the hydraulically controlled three-position four-way reversing proportional valve. At the same time, the entire hydraulic system reaches the lowest saturation state according to the load size.

[0019] The present invention adopts two load-sensing variable pumps to form a volume speed regulation system, which greatly improves the overall performance of the drilling rig and meets the requirements of high-power high-frequency vibration and low-speed high-torque rotary drilling conditions; and automatically adjusts the power output of the hydraulic pump according to load changes, greatly reducing energy consumption; and adds pressure compensation on both sides of the proportional valve so that its flow is only affected by the opening gap of the proportional valve, thereby improving the stability of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a hydraulic system of an acoustic environmentally friendly drilling rig according to a specific embodiment of the present invention.

[0021] The technical features indicated by the reference numerals in the figure are:

[0022] 1. Suction filter; 2. Collecting ring; 3. Engine; 4. First load-sensing variable pump; 5. Second load-sensing variable pump; 6. First check valve; 7. Second check valve; 8. Pilot relief valve; 9. First shuttle valve; 10. First differential pressure reducing valve; 11. First hydraulically controlled three-position four-way proportional reversing valve; 12. First one-way relief valve; 13. Second one-way relief valve; 14. First throttling orifice; 15. Three-position three-way reversing valve; 16. First vibration motor; 17. Second vibration motor; 18. Second throttling orifice; 19. Fixed-value pressure reducing valve; 20 , DC relief valve; 21, first pilot control valve; 22, second pilot control valve; 23, third pilot control valve; 24, second differential pressure reducing valve; 25, second hydraulically controlled three-position four-way proportional directional control valve; 26, third one-way relief valve; 27, fourth one-way relief valve; 28, rotary motor; 29, third shuttle valve; 30, fourth shuttle valve; 31, third differential pressure reducing valve; 32, third hydraulically controlled three-position four-way proportional directional control valve; 33, fifth one-way relief valve; 34, sixth one-way relief valve; 35, feed cylinder; 36, fifth shuttle valve; 37, second shuttle valve. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0024] The present invention adopts the following technical solution:

[0025] In the hydraulic system, the filter is directly installed in the hydraulic oil tank, the liquid collecting ring is installed at the outlet of the oil suction filter, and the liquid inlet of one or more load-sensing variable pumps is connected to the liquid collecting ring. This optimizes the layout space of the pipeline and makes it easier to arrange it on a small drilling rig.

[0026] Two (or more) load-sensing variable pumps are connected in series in the hydraulic system. Each load-sensing variable pump outlet is individually provided with a one-way valve to prevent the hydraulic oil from flowing back into the load-sensing variable pump. The load sensing ports of the two (or more) load-sensing variable pumps receive the load sensing pressure at the same time.

[0027] In the hydraulic system, the hydraulic oil source is connected in series and passes through a fixed-value pressure reducing valve to stabilize the pressure within a range, and then the pressure is stabilized by a parallel relief valve to ensure that the inlet pressure of the pilot control valve has a high stability.

[0028] A differential pressure reducing valve is connected in series at the front end of each group of proportional valves. The two pressure feedback ports of the differential pressure reducing valve are connected to the inlet and outlet of the proportional valve respectively through the working characteristics of the shuttle valve, thus forming a pressure compensation circuit to ensure the constant pressure difference between the inlet and outlet of the proportional valve, so that the flow of the oil circuit is not affected by the system pressure and load.

[0029] The shuttle valve is connected in series to the load pressure feedback loop of the hydraulic system by utilizing the working characteristics of the shuttle valve, and the maximum load sensing pressure is fed back to the load sensing variable pump to ensure that the hydraulic system works in a saturated state.

[0030] A one-way relief valve is set at the load A and B ports respectively, which has the maximum rated pressure protection function in the positive and negative directions of the load, and the one-way relief valve is used to enable the system to have the oil replenishment function for the return oil pipeline.

[0031] Two high-speed motors are connected in parallel, a hydraulically controlled three-position three-way reversing valve is connected in parallel to the A and B ports of the high-speed motor, and a throttling orifice plate is connected in series to the oil outlet of the three-position three-way reversing valve to increase the flushing hydraulic oil for the high-speed motor housing.

[0032] For details, see Figure 1 , showing a schematic diagram of the hydraulic pressure of an acoustic environmentally friendly drilling rig according to a specific embodiment of the present invention.

[0033] An acoustic environmentally friendly drilling rig hydraulic system includes: an oil source circuit, a pilot control circuit and a flow regulating circuit.

[0034] The oil source circuit includes: an engine 3 drives two or more load-sensing variable pumps connected in series, the load-sensing variable pumps (4, 5) connected in series converge at the outlet, and are connected in parallel with the overflow valve 8 at the confluence of the pipeline, the oil suction ports of the load-sensing variable pumps connected in series are respectively connected to the oil outlets of the liquid collecting ring 2, the oil inlet of the liquid collecting ring 2 is connected to the oil outlet of the oil suction filter 1, the oil inlet of the oil suction filter 1 is directly connected to the oil tank, and the load sensitive ports of the load-sensing variable pumps connected in series in the hydraulic system are connected to the middle oil port of the first shuttle valve 9, thereby forming an oil source circuit of the hydraulic system.

[0035] The pilot control circuit includes: the oil inlet of the throttle orifice plate 18 is connected to the oil source circuit, the oil outlet is connected to the oil inlet of the fixed pressure reducing valve 19, the oil outlet of the fixed pressure reducing valve 19 is connected to the oil inlet (i.e., the P port) of the first pilot control valve 21, the second pilot control valve 22 and the third pilot control valve 23 respectively connected in parallel, and the direct current overflow valve 20 is connected in parallel to the oil inlet of the first, second and third pilot control valves, and the oil return ports of the first, second and third pilot control valves (21, 22, 23) are directly connected to the oil tank. The control pressure signal (a, b) ports of the first, second and third pilot control valves (21, 22, 23) are respectively connected to the control pressure signal input ports (a, b) of the corresponding first, second and third hydraulically controlled three-position four-way reversing proportional valves (11, 25, 32), thereby forming a hydraulic system pilot control circuit.

[0036] The flow regulating circuit comprises: a first differential pressure reducing valve 10, a second differential pressure reducing valve 24 and a third differential pressure reducing valve 31, the oil inlets of which are respectively connected to the oil source circuit, and the oil outlets are respectively connected to the oil inlets (P ports) of the first hydraulically controlled three-position four-way reversing proportional valve 11, the second hydraulically controlled three-position four-way reversing proportional valve 25 and the third hydraulically controlled three-position four-way reversing proportional valve 32, the pressure signal feedback ports of the first, second and third differential pressure reducing valves (10, 24, 31) are respectively connected to the oil inlets (P ports) of the first, second and third hydraulically controlled three-position four-way reversing proportional valves (11, 25, 32), and are respectively connected to the first through the second shuttle valve 37, the third shuttle valve 29 and the fifth shuttle valve 36. The oil outlets (A and B ports) of the second and third hydraulically controlled three-position four-way directional proportional valves (11, 25, 32) are connected, the oil return ports (T ports) of the first, second and third hydraulically controlled three-position four-way directional proportional valves (11, 25, 32) are directly connected to the oil tank, two parallel vibration motors (16, 17) are connected to the oil outlets (A and B ports) of the first hydraulically controlled three-position four-way directional proportional valve 11, the rotary motor 18 is connected to the oil outlets (A and B ports) of the second hydraulically controlled three-position four-way directional proportional valve 25, and the feed cylinder 35 is connected to the oil outlets (A and B ports) of the third hydraulically controlled three-position four-way directional proportional valve 32, thereby forming a flow regulating loop in which each branch of the system is not affected by the load.

[0037] Specifically, the series-connected load-sensing variable pumps include a first load-sensing variable pump 4 and a second load-sensing variable pump 5 connected in series, and their outlets are connected in series and meet at the outlets after passing through a first one-way valve 6 and a second one-way valve 7 respectively.

[0038] Furthermore, it also has load end pressure protection and load return oil pipeline oil replenishment circuit, such as Figure 1 As shown, the first one-way relief valve 12 and the second one-way relief valve 13 are respectively connected to the oil outlet (A and B ports) of the first hydraulically controlled three-position four-way reversing proportional valve 11, the third one-way relief valve 26 and the fourth one-way relief valve 27 are respectively connected to the oil outlet (A and B ports) of the second hydraulically controlled three-position four-way reversing proportional valve 25, the fifth one-way relief valve 33 and the sixth one-way relief valve 34 are respectively connected to the oil outlet (A and B ports) of the third hydraulically controlled three-position four-way reversing proportional valve 32, and each oil outlet is directly connected to the oil tank, thereby forming a load-end pressure protection and load return oil pipeline oil replenishment circuit.

[0039] Further, it also has a vibration motor flushing circuit, such as Figure 1As shown, the two control ports at both ends of the three-position three-way reversing valve 15 and the two upper middle oil inlets are respectively connected to the oil outlets (A and B ports) of the first hydraulically controlled three-position four-way reversing proportional valve 11. The lower middle oil outlet is connected to the oil inlet of the first throttle orifice plate 14, and the oil outlet of the first throttle orifice plate 14 is connected to the upper oil drain port of the housing of the two parallel first vibration motors 16 and second vibration motors 17. After the hydraulic oil passes through the housings of the first and second vibration motors (16, 17), it directly flows back to the oil tank through the lower oil drain port, thereby forming a vibration motor flushing circuit.

[0040] Furthermore, there is a load sensing circuit, such as Figure 1 As shown, the upper and lower ports of the second shuttle valve 37, the third shuttle valve 29 and the fifth shuttle valve 36 are respectively connected to the oil outlets (A and B ports) of the corresponding first, second and third hydraulically controlled three-position four-way reversing proportional valves (11, 25, 32), the middle port of the second shuttle valve 37 is connected to the left port of the first shuttle valve 9, the middle ports of the third shuttle valve 29 and the fifth shuttle valve 36 are connected to the upper and lower ports of the fourth shuttle valve 30, the middle port of the fourth shuttle valve 30 is connected to the right port of the first shuttle valve 9, and the middle port of the first shuttle valve 9 is connected to the load sensing ports of the first and second load sensing variable pumps (4, 5) connected in series.

[0041] Furthermore, the present invention further discloses a control method for an acoustic environmentally friendly drilling rig hydraulic system:

[0042] In the initial state of the hydraulic system, the first to third pilot control valves (21, 22, 23) are not operated, the control ports (a, b) of the pilot control valves have no pressure output, the corresponding hydraulically controlled three-position four-way proportional valves (11, 25, 32) are in the middle position (i.e., closed state), the actuators, i.e., the parallel vibration motors (16, 17), the rotary motor 28, and the feed cylinder 35 are not in motion, the load sensing circuit has no pressure feedback signal, the parallel load sensing variable pumps (4, 5) output at the set minimum flow rate, but the setting of the minimum flow rate value needs to meet the minimum saturation requirement of the pilot control oil circuit, the system as a whole works in a relatively low flow and pressure state, and the power consumed by the system is very low.

[0043] When the first to third pilot control valves (21, 22, 23) are manually operated individually or simultaneously, the corresponding valve cores of the first to third pilot control valves (21, 22, 23) are actuated according to the amplitude and direction of the pilot control valve operating levers, so that the pressure of the control ports (a, b) is output proportionally and the flow direction of the hydraulic oil is controlled, so that the hydraulically controlled three-position four-way directional proportional valves (11, 25, 32) corresponding to the first to third pilot control valves (21, 22, 23) are opened and switched according to the set ratio. Thus, the vibration motors (16, 17), the rotary motor 28, and the feed cylinder 35 connected in parallel with the load are driven to work respectively. At the same time, the load sensing feedback oil circuit (i.e., the oil circuit above the load variable pump) feeds back the highest pressure at the load end of the system to each load sensing variable pump according to the characteristics of the load feedback oil circuit, driving the load variable pump to increase the flow rate. When each differential pressure reducing valve (10, 24, 31) reaches a stable state, the inlet and outlet pressure difference of each hydraulically controlled three-position four-way reversing proportional valve (11, 25, 32) is constant, and the hydraulic oil flow is only controlled by the hydraulically controlled three-position four-way reversing proportional valve. At the same time, the entire hydraulic system reaches the lowest saturation state according to the load size. This will greatly reduce the power loss of the system. In addition, since the system always works in a saturated state, the problem of mutual influence between execution actions is solved.

[0044] A one-way relief valve (12, 13, 26, 27, 33, 34) is separately installed at the oil outlet (A and B ports) of each hydraulically controlled three-position four-way proportional valve (11, 25, 32), that is, the load port, so that the rated working safety pressure of different loads can be set separately without interference. With the one-way relief valve, if the oil circuit pressure at the load end is negative due to load inertia or other factors, the oil will directly replenish the system through the one-way valve to prevent vacuum or cavitation in the oil circuit. This improves the stability of the system.

[0045] The flushing circuit of the first vibration motor 16 and the second vibration motor 17 connected in parallel, no matter how the first hydraulically controlled three-position four-way reversing proportional valve 11 is switched, its oil outlets (A, B) always have one high-pressure port and one low-pressure port, so that the three-position three-way reversing valve 15 is opened, and the hydraulic oil flows into the casing of the first vibration motor 16 and the second vibration motor 17 connected in parallel through the first throttle orifice plate 14, and flows back to the oil tank through the oil drain port, thereby flushing and cooling the vibration motor when the vibration motor is running at high speed.

[0046] In summary, the present invention comprises two load sensing variable pumps to form a volumetric speed regulation system, the oil circuit adopts a variable pump group composed of two hydraulic load sensing variable pumps to provide an oil source, and a motor, a cylinder, etc. are used as actuators and control valves to form a volumetric speed regulation hydraulic system. The output of the hydraulic load sensing variable pump group is controlled on and off by the oil circuit formed by the shuttle valve in series and parallel connection, the hydraulic load sensitive proportional reversing valve is controlled by the manual pilot valve, the first hydraulically controlled three-position four-way proportional reversing valve controls two fixed-displacement high-speed motors on the power head to directly drive the eccentric shaft of the power head to achieve acoustic vibration, the second hydraulically controlled three-position four-way proportional reversing valve controls a low-speed and high-torque motor to drive the drill tool to rotate, and the third hydraulically controlled three-position four-way proportional reversing valve controls the feed cylinder; the present invention adopts two load sensing variable pumps to form a volume speed regulation system, which greatly improves the overall performance of the drilling rig and meets the requirements of high-power and high-frequency vibration and low-speed and high-torque rotation drilling conditions; and automatically adjusts the power output of the hydraulic pump according to load changes, which greatly reduces energy consumption; pressure compensation is added on both sides of the proportional valve so that its flow is only affected by the opening gap of the proportional valve, thereby improving the stability of the hydraulic system.

[0047] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection scope of the present invention determined by the submitted claims.

Claims

1. An acoustic environmentally friendly drilling rig hydraulic system, characterized in that: include: Oil source circuit, pilot control circuit and flow regulation circuit, The oil source circuit includes: the engine drives two or more load-sensing variable pumps connected in series, the load-sensing variable pumps connected in series are merged at the outlet, and are connected in parallel with the overflow valve at the confluence of the pipeline, the oil suction ports of the load-sensing variable pumps connected in series are respectively connected with the oil outlets of the liquid collecting ring, the oil inlet of the liquid collecting ring is connected with the oil outlet of the oil suction filter, the oil inlet of the oil suction filter is directly connected to the oil tank, and the load-sensing port of the load-sensing variable pumps connected in series in the hydraulic system is connected with the middle oil port of the first shuttle valve, thereby forming an oil source circuit of the hydraulic system; The pilot control circuit comprises: the oil inlet of the throttle orifice plate is connected to the oil source circuit, the oil outlet is connected to the oil inlet of the fixed value pressure reducing valve, the oil outlet of the fixed value pressure reducing valve is connected to the oil inlets of the first pilot control valve, the second pilot control valve and the third pilot control valve which are respectively connected in parallel, and the overflow valve is connected in parallel to the oil inlets of the first, second and third pilot control valves, and the oil return ports of the first, second and third pilot control valves are directly connected to the oil tank; the control pressure signal ports of the first, second and third pilot control valves are respectively connected to the control pressure signal input ports of the corresponding first, second and third hydraulically controlled three-position four-way reversing proportional valves, thereby forming a hydraulic system pilot control circuit; The flow regulating circuit comprises: a first differential pressure reducing valve, a second differential pressure reducing valve and a third differential pressure reducing valve, the oil inlets of which are respectively connected to the oil source circuit, and the oil outlets are respectively connected to the oil inlets of the first hydraulically controlled three-position four-way reversing proportional valve, the second hydraulically controlled three-position four-way reversing proportional valve and the third hydraulically controlled three-position four-way reversing proportional valve, the pressure signal feedback ports of the first, second and third differential pressure reducing valves are respectively connected to the oil inlets of the first, second and third hydraulically controlled three-position four-way reversing proportional valves, and are respectively connected to the oil outlets of the first, second and third hydraulically controlled three-position four-way reversing proportional valves through the second shuttle valve, the third shuttle valve and the fifth shuttle valve, the oil return ports of the first, second and third hydraulically controlled three-position four-way reversing proportional valves are directly connected to the oil tank, two parallel vibration motors are connected to the oil outlet of the first hydraulically controlled three-position four-way reversing proportional valve, the rotary motor is connected to the oil outlet of the second hydraulically controlled three-position four-way reversing proportional valve, and the feed cylinder is connected to the oil outlet of the third hydraulically controlled three-position four-way reversing proportional valve, thereby forming a flow regulating circuit in which each branch of the system is not affected by the load.

2. The acoustic environmental protection drilling rig hydraulic system according to claim 1, characterized in that: The series load-sensing variable displacement pumps include a first load-sensing variable displacement pump and a second load-sensing variable displacement pump connected in series and joined at an outlet.

3. The acoustic environmental protection drilling rig hydraulic system according to claim 2, characterized in that: It also has load-end pressure protection and a load return oil pipeline oil replenishment circuit. The first one-way relief valve and the second one-way relief valve are respectively connected to the oil outlet of the first hydraulically controlled three-position four-way reversing proportional valve, the third one-way relief valve and the fourth one-way relief valve are respectively connected to the oil outlet of the second hydraulically controlled three-position four-way reversing proportional valve, the fifth one-way relief valve and the sixth one-way relief valve are respectively connected to the oil outlet of the third hydraulically controlled three-position four-way reversing proportional valve, and each oil outlet is directly connected to the oil tank, thereby constituting a load-end pressure protection and a load return oil pipeline oil replenishment circuit.

4. The acoustic environmental protection drilling rig hydraulic system according to claim 2, characterized in that: It also has a vibration motor flushing circuit. The control ports at both ends of the three-position three-way reversing valve and the two upper middle oil inlets are respectively connected to the oil outlet of the first hydraulically controlled three-position four-way reversing proportional valve, and the lower middle oil outlet is connected to the oil inlet of the first throttling orifice plate. The oil outlet of the first throttling orifice plate is connected to the upper oil drain ports of the outer casings of the two parallel first and second vibration motors. After the hydraulic oil passes through the casings of the first and second vibration motors, it directly flows back to the oil tank through the lower oil drain port, thereby forming a vibration motor flushing circuit.

5. The acoustic environmental protection drilling rig hydraulic system according to claim 2, characterized in that: It also has a load sensing circuit, the upper and lower ports of the second shuttle valve, the third shuttle valve and the fifth shuttle valve are respectively connected to the oil outlets of the corresponding first, second and third hydraulically controlled three-position four-way reversing proportional valves, the middle port of the second shuttle valve is connected to the left port of the first shuttle valve, the middle ports of the third shuttle valve and the fifth shuttle valve are connected to the upper and lower ports of the fourth shuttle valve, the middle port of the fourth shuttle valve is connected to the right port of the first shuttle valve, and the middle port of the first shuttle valve is connected to the load sensing ports of the first and second load sensing variable pumps connected in series.

6. The acoustic environmental protection drilling rig hydraulic system according to claim 2, characterized in that: The first load-sensing variable displacement pump and the second load-sensing variable displacement pump connected in series have their outlets respectively passing through the first one-way valve and the second one-way valve and then converging at the outlet.

7. A control method for an acoustic environmentally friendly drilling rig hydraulic system according to any one of claims 2 to 6, characterized in that: In the initial state of the hydraulic system, the first to third pilot control valves are not operated, the control port of the pilot control valve has no pressure output, the corresponding hydraulically controlled three-position four-way proportional valves are in the middle position, that is, closed, the actuators, that is, the parallel vibration motor, rotary motor, and feed cylinder are not in action, the load sensing circuit has no pressure feedback signal, the series load sensing variable pump outputs at the set minimum flow rate, the system as a whole works at a lower flow and pressure state, and the system consumes low power; When the first to third pilot control valves are manually operated individually or simultaneously, the corresponding valve cores of the first to third pilot control valves act according to the amplitude and direction of the pilot control valve joystick, so that the pressure of the control port is output proportionally and the flow direction of the hydraulic oil is controlled, so that the hydraulically controlled three-position four-way reversing proportional valves corresponding to the first to third pilot control valves are opened and reversed according to the set proportion, thereby driving the two vibration motors, rotary motor and feed cylinder connected in parallel with the load to work respectively. At the same time, the load sensing feedback oil circuit feeds back the highest pressure at the load end of the system to each load sensing variable pump according to the characteristics of the load feedback oil circuit, driving the load variable pump to increase the flow rate. When each differential pressure reducing valve reaches a stable state, the pressure difference between the inlet and outlet of each hydraulically controlled three-position four-way reversing proportional valve is constant, and the hydraulic oil flow is only controlled by the hydraulically controlled three-position four-way reversing proportional valve. At the same time, the entire hydraulic system reaches the lowest saturation state according to the load size.

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