Rotary drilling rig pressurized hydraulic system and control method thereof, rotary drilling rig

Abstract

The present application relates to a rotary drilling rig, to solve the problem that the existing rotary drilling pressurized hydraulic system uses two different systems for control under two working conditions of drilling and non-drilling, the present application constructs a rotary drilling rig pressurized hydraulic system, a control method thereof and a rotary drilling rig, wherein the pressurized hydraulic system comprises a main valve, a hydraulic pump, a pressurized cylinder, a main valve control device for operating the main valve, the main valve comprises a power head joint main valve and a pressurized joint main valve, the oil inlet main oil paths of the pressurized joint main valve and the power head joint main valve are connected with the same hydraulic pump, and an electric proportional overflow valve for limiting maximum pressure is arranged on the pressurized joint main valve and the pressurized cylinder connection oil path; the controller controls the overflow opening pressure of the electric proportional overflow valve according to the working condition, and makes the valve port opening degree of the pressurized joint main valve less than the normal operating opening degree under the drilling working condition. The present application automatically identifies and controls the drilling working condition and the block pressurized working condition, so that the rotary drilling rig is simple to operate.

Description

TECHNICAL FIELD

[0001] The present application relates to a rotary drilling rig, more particularly, to a rotary drilling rig pressurized hydraulic system, a control method thereof and a rotary drilling rig. BACKGROUND

[0002] The pressurized cylinder of the rotary drilling rig is connected with the power head, and the extension and retraction of the cylinder piston rod can drive the drill rod and drill bit to move up and down through the power head, and the power head can also output torque to drive the drill rod and power head to rotate to perform drilling operation. The pressurized cylinder needs to quickly perform full stroke action when the drill rod is lifted / put down to speed up the movement of the drill rod, at this time the working condition is high pressure and large flow, which is a non-drilling working condition. When drilling in rock stratum, the pressurized cylinder needs to pressurize the power head, and the pressure is transmitted to the drill bit through the drill rod to obtain greater drilling force, and the cylinder output force also needs to be strictly controlled to avoid overloading and damaging the drill rod and drill bit, at this time the working condition is medium pressure and small flow, which is a drilling working condition.

[0003] The input power required by the pressurized cylinder of the rotary drilling rig under the two working conditions of non-drilling and drilling working conditions can differ by more than ten times. In order to meet the power requirements of the pressurized cylinder under different working conditions, the existing scheme adopts two sets of hydraulic systems, which are switched by the driver as needed. Because the power requirements of the two working conditions of fast pressurization and slow pressurization differ greatly, two sets of systems are needed to meet their requirements, the system composition is relatively complex, the cost is also higher, and the function switching depends on the driver to manually select according to the working condition, which needs to be frequently switched in the working cycle, the technical requirements for the operator are high, the operation intensity is also large, and fatigue is easy to occur SUMMARY

[0004] The technical problem to be solved by the present application is that the existing rotary drilling pressurized hydraulic system adopts two different systems for control under the two working conditions of drilling and non-drilling, and the present application provides a rotary drilling rig pressurized hydraulic system, a control method thereof and a rotary drilling rig.

[0005] The technical solution of the present application to achieve its purpose is as follows: a rotary drilling rig pressurized hydraulic system is constructed, which comprises a main valve, a left pump, a right pump, a pressurized cylinder, a main valve control device for controlling the main valve, characterized in that: the oil inlet main oil path of the first power head associated main valve in the main valve is connected with the left pump, and the oil inlet main oil paths of the pressurized associated main valve and the second power head associated main valve in the main valve are both connected with the right pump; the pressurized hydraulic system further comprises:

[0006] A detection device is arranged to detect state information for judging the working condition of the rotary drilling rig;

[0007] An electric proportional relief valve is arranged in communication with the working oil port of the pressurized associated main valve, and is used to limit the maximum pressure of the pressurized associated main valve and the pressurized cylinder connection oil path;

[0008] A controller is electrically connected with the main valve control device, the detection device and the electric proportional overflow valve.

[0009] When the working condition is the non-drilling working condition, the controller controls the electric proportional overflow valve to work at the non-drilling working condition overflow pressure.

[0010] When the working condition is the drilling working condition, the controller controls the electric proportional overflow valve to work at the drilling working condition overflow pressure, and controls the main valve control device to make the valve port opening degree of the pressurizing associated main valve smaller than the normal operating opening degree.

[0011] In the pressurizing hydraulic system of the rotary drilling rig, the main valve control device comprises a pilot valve connected with the power head associated main valve and the pressurizing associated main valve, and an electric proportional pressure reducing valve arranged on a pilot oil path between the pilot valve and the pilot control end of the pressurizing associated main valve, wherein the electric proportional pressure reducing valve is a reverse proportional pressure reducing valve and is electrically connected with the controller; the detection device is used for detecting the operating action signal of the main valve control device, and comprises a power head pilot pressure sensor for detecting the pressure of a pilot pressure output port corresponding to the power head associated main valve on the pilot valve and a pressurizing pilot pressure sensor for detecting the pressure of a pilot pressure output port corresponding to the pressurizing associated main valve on the pilot valve; the power head pilot pressure sensor and the pressurizing pilot pressure sensor are electrically connected with the controller. The electric proportional pressure reducing valve is a reverse proportional pressure reducing valve, when the control current is zero, the pressure difference between the oil inlet end and the oil outlet end of the electric proportional pressure reducing valve is minimum, and with the increase of the control current, the pressure difference between the oil inlet end and the oil outlet end gradually increases.

[0012] In the pressurizing hydraulic system of the rotary drilling rig, the main valve control device can also comprise an electric control handle for sending the operating action signal to the controller, a pressurizing pilot electric proportional pressure reducing valve connected between the pilot control end of the pressurizing associated main valve and a pilot pressure oil source, and a power head pilot electric proportional pressure reducing valve connected between the pilot control end of the power head associated main valve and the pilot pressure oil source; the pressurizing pilot electric proportional pressure reducing valve and the power head pilot electric proportional pressure reducing valve are electrically connected with the controller; and the detection device comprises the electric control handle. When the electric control handle is operated to swing, it sends an operating electric signal to the controller, the controller outputs corresponding control current to the corresponding pilot electric proportional valve according to the operating electric signal of the electric control handle, and the electric control handle also serves as the detection device, and the controller can also judge whether the rotary drilling rig has performed corresponding action operation according to the operating electric signal, and further judges the working condition of the rotary drilling rig.

[0013] The pressurized hydraulic system of the rotary drilling rig further comprises a main pump pressure sensor connected to the controller for detecting the pressure at the pump outlet of the left pump and the right pump. When the working condition is the drilling condition, the controller controls the main valve control device to reduce the valve opening degree of the pressurizing main valve to a pressure difference between the pressure at the pump outlet of the left pump and the pressure at the pump outlet of the right pump within a predetermined range. The main pump pressure sensor comprises a pressure sensor for detecting the pressure at the pump outlet of the left pump and a pressure sensor for detecting the pressure at the pump outlet of the right pump. In the drilling condition, the relief opening pressure of the electric proportional relief valve is low, but as the valve opening degree of the pressurizing main valve is reduced, the damping is increased, the oil flow through the pressurizing main valve is small, and the pressure at the main oil inlet of the pressurizing main valve (i.e. the pressure at the pump outlet of the right pump) is increased. When the valve opening degree of the pressurizing main valve is reduced to a predetermined value, the pressure difference between the pressure at the pump outlet of the right pump and the pressure at the pump outlet of the left pump is reduced to within a predetermined range, or even the pressures at the pump outlets of the left pump and the right pump are equal.

[0014] The pressurized hydraulic system of the rotary drilling rig further comprises a left pump pressure sensor connected to the controller for detecting the pressure at the pump outlet of the left pump. When the controller obtains the operation action signals related to the head main valve and the pressurizing main valve at the same time and the pressure at the pump outlet of the left pump is greater than a preset value of the left pump, it is determined that the rotary drilling rig is in the drilling condition, otherwise it is in the non-drilling condition. In the present application, the operation action signals include the pressurizing operation action signal for reversing control of the pressurizing main valve and the head operation action signal for reversing control of the head main valve.

[0015] The technical solution for realizing the purpose of the present application is as follows: a rotary drilling rig is constructed, characterized in that it has the pressurized hydraulic system of the rotary drilling rig as described above.

[0016] The technical solution for realizing the purpose of the present application is as follows: a control method for the pressurized hydraulic system of the rotary drilling rig as described above is provided, characterized in that the steps of the control method are as follows:

[0017] detecting state information for determining the working condition of the rotary drilling rig and determining whether the working condition of the rotary drilling rig is the non-drilling condition or the drilling condition according to the detected information;

[0018] when the working condition is the non-drilling condition, the controller controls the electric proportional relief valve to work at the non-drilling condition relief pressure;

[0019] when the working condition is the drilling condition, the controller controls the electric proportional relief valve to work at the drilling condition relief pressure, and controls the main valve control device to reduce the valve opening degree of the pressurizing main valve to be less than the normal operation opening degree. The normal operation opening degree refers to the time when the pressure difference between the oil outlet and the oil inlet of the electric proportional relief valve reaches the minimum, and the valve opening degree of the pressurizing main valve is controlled by operating the pilot valve.

[0020] In the control method of the pressurized hydraulic system of the rotary drilling rig, when the working condition is drilling, the pump port pressures of the left pump and the right pump are detected, and the controller controls the opening degree of the valve port of the pressurizing main valve through the main valve control device to make the pressure difference between the left pump port pressure and the right pump port pressure within a predetermined range.

[0021] In the control method of the pressurized hydraulic system of the rotary drilling rig, the state information for judging the working condition of the rotary drilling rig is the detection of the operation action signals associated with the pressurizing main valve and the power head main valve in the main valve control device. When the controller only obtains the operation action signal associated with the pressurizing main valve, it is determined that the rotary drilling rig is in a non-drilling condition. When the controller simultaneously obtains the operation action signals associated with the power head main valve and the pressurizing main valve, it is determined that the rotary drilling rig is in a drilling condition.

[0022] In the control method of the pressurized hydraulic system of the rotary drilling rig, the state information for judging the working condition of the rotary drilling rig includes the detection of the operation action signals associated with the pressurizing main valve and the power head main valve in the main valve control device and the detection of the left pump port pressure signal. When the controller simultaneously obtains the operation action signals associated with the power head main valve and the pressurizing main valve and the left pump pressure is greater than the preset value of the left pump, it is determined that the rotary drilling rig is in a drilling condition, otherwise it is in a non-drilling condition.

[0023] Compared with the prior art, the pressurizing cylinder and the power head motor are supplied with oil by the same pump, and the drilling condition and the block pressurizing condition are automatically identified and controlled, so that the rotary drilling rig is easy to operate. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the principle diagram of the first embodiment of the pressurized hydraulic system of the rotary drilling rig.

[0025] Figure 2 is the flow chart of the control method of the pressurized hydraulic system of the rotary drilling rig.

[0026] Figure 3 is the principle diagram of the second embodiment of the pressurized hydraulic system of the rotary drilling rig.

[0027] Names and serial numbers of parts in the figure:

[0028] Main valve 10, pressurizing main valve 11, first winch main valve 12, second winch main valve 13, first power head main valve 14, second power head main valve 15, left walking main valve 16, right walking main valve 17, electric proportional overflow valve 18.

[0029] Right pump 21, left pump 22, pilot pressure oil source 23.

[0030] Pressurizing cylinder 3.

[0031] Controller 4, pilot valve 40, pressurization pilot pressure sensor 41, power head pilot pressure sensor 42, electro-proportional pressure reducing valve 43, left pump pressure sensor 44, right pump pressure sensor 45, pressurization pilot electro-proportional pressure reducing valve 46, power head pilot electro-proportional pressure reducing valve 47, electric control handle 48. Detailed Implementation

[0032] The specific implementation plan is described below with reference to the attached diagram.

[0033] Example 1.

[0034] Figure 1 A schematic diagram of the pressurized hydraulic system in a first embodiment of the rotary drilling rig of the present invention is shown. In this embodiment, the pressurized hydraulic system employs a hydraulic control method to control the pressurized cylinder and the power head motor (not shown in the figure).

[0035] like Figure 1 As shown, the pressurized hydraulic system includes a main valve 10, a hydraulic pump, a pressurized cylinder 3, a main valve control device, a detection device, a controller 4, etc.

[0036] The hydraulic pumps include a left pump 22 and a right pump 21. The main valves 10 include a pressure-connected main valve 11, a first winch-connected main valve 12, a second winch-connected main valve 13, a first power head-connected main valve 14, a second power head-connected main valve 15, a left travel-connected main valve 16, a right travel-connected main valve 17, and an electro-proportional relief valve 18. The main oil inlet circuits of the pressure-connected main valves 11, 13, 15, and 17 are all connected to the right pump 21, and are supplied with oil by the right pump 21. The main oil inlet circuits of the first winch-connected main valve 12, 14, and 16 are connected to the left pump 22, and are supplied with oil by the left pump 22. The working ports of the first power head-connected main valve 14 and the second power head-connected main valve 15 are connected to the power head motor through a confluence circuit, outputting hydraulic oil to drive the power head motor.

[0037] The working port of the pressure-adjusting main valve 11 is connected to the pressure-adjusting cylinder 3. The connecting oil circuit between the working port of the pressure-adjusting main valve 11 and the pressure-adjusting cylinder 3 is connected to the inlet of the electro-proportional relief valve 18. The outlet of the electro-proportional relief valve 18 is connected to the hydraulic oil tank. The solenoid coil of the electro-proportional relief valve 18 is connected to the controller 4, and the controller 4 outputs a control current to control the relief opening pressure of the electro-proportional relief valve 18. Under the control of the controller, the electro-proportional relief valve 18 can operate under two relief opening pressures: the non-drilling condition relief pressure and the drilling condition relief pressure. The non-drilling condition relief pressure is greater than the drilling condition relief pressure.

[0038] The main valve control device comprises a pilot valve 40 and an electric proportional pressure reducing valve 43. The pilot valve 40 also has multiple connections, each connection of the pilot valve 40 corresponds to the pilot control end of each connection of the main valve 10, and the electric proportional pressure reducing valve 43 is arranged on the connecting oil circuit between the pilot valve 40 and the pilot control end of the pressurizing connection main valve. The oil inlet end of the electric proportional pressure reducing valve 43 is connected with the pilot valve, the oil outlet end is connected with the pilot control end of the pressurizing connection main valve, and the electromagnetic coil of the electric proportional pressure reducing valve 43 is connected with the controller.

[0039] The electric proportional pressure reducing valve 43 is a reverse proportional pressure reducing valve, and the pressure at the oil outlet end thereof decreases with the increase of the control current when the pressure at the oil inlet end thereof is constant. When the control current is zero, the pressure at the oil outlet end of the electric proportional pressure reducing valve is basically equal to the pressure at the oil inlet end.

[0040] When the control current of the electric proportional pressure reducing valve is zero, the pilot pressure oil output from the pilot pressure output port of the pilot valve corresponding to the pressurizing connection main valve acts on the pilot hydraulic control end of the pressurizing connection main valve, pushes the valve rod of the pressurizing connection main valve to move, so that the pressurizing connection main valve is opened, and the valve port opening degree of the pressurizing connection main valve has a corresponding relationship with the pilot pressure output by the pilot valve, that is, when the control current of the electric proportional pressure reducing valve is zero, the valve port opening degree of the pressurizing connection main valve opened is the normal operating opening degree corresponding to the pilot pressure output by the pilot valve. When the control current of the electric proportional pressure reducing valve is not zero, the pilot pressure acting on the pilot hydraulic control end of the pressurizing connection main valve is smaller than the pilot pressure output by the pilot valve at this time, that is, the valve port opening degree of the pressurizing connection main valve opened at this time is smaller than the normal operating opening degree.

[0041] The detection device comprises a power head pilot pressure sensor 42 and a pressurizing pilot pressure sensor 41.

[0042] The power head pilot pressure sensor 42 is arranged on the pilot oil circuit between the pilot pressure output port of the pilot valve corresponding to the power head connection main valve and the pilot control end of the power head connection main valve, and is used to detect whether the pilot pressure oil is output from the pilot pressure output port of the pilot valve corresponding to the power head connection main valve. When the pilot pressure detected by the power head pilot pressure sensor 42 is greater than a predetermined value, it can be inferred that the operator has controlled the pilot valve to make the power head motor enter the working state.

[0043] The pressurizing pilot pressure sensor 41 is arranged on the pilot oil circuit between the pilot pressure output port of the pilot valve 40 corresponding to the pressurizing connection main valve and the pilot control end of the pressurizing connection main valve, and is arranged between the electric proportional pressure reducing valve 43 and the pilot pressure output port of the pilot valve 40. The pressurizing pilot pressure sensor 41 is used to detect whether the pilot pressure oil is output from the pilot pressure output port of the pilot valve corresponding to the pressurizing connection main valve. When the pilot pressure detected by the pressurizing connection pilot pressure sensor is greater than a predetermined value, it can be inferred that the operator has controlled the pilot valve to make the pressurizing cylinder perform the extension or retraction action.

[0044] In the embodiment, the controller judges the working condition of the rotary drilling rig by detecting whether the pilot valve outputs pilot pressure to the pilot pressure output port through the pressurizing pilot pressure sensor 41 and the power head pilot pressure sensor 42. When the pilot pressure detected by the pressurizing pilot pressure sensor is greater than the predetermined value and the pilot pressure detected by the power head pilot pressure sensor is less than the predetermined value, i.e. the controller obtains only the operation action signal associated with the pressurizing main valve in the operation action signals, it is inferred that the rotary drilling rig is in the non-drilling working condition, in which the pressurizing cylinder is extended or retracted to move the swivel rod and the drill bit downward or upward, and the swivel rod and the drill bit do not rotate. When the pilot pressure detected by the pressurizing pilot pressure sensor is greater than the predetermined value and the pilot pressure detected by the power head pilot pressure sensor is greater than the predetermined value, i.e. the controller obtains both the operation action signal associated with the pressurizing main valve and the operation action signal associated with the power head main valve in the operation action signals, it is inferred that the rotary drilling rig is in the drilling working condition, in which the power head applies downward force to the drill rod, and the power head motor drives the drill rod to rotate the drill bit to drill into the earth or rock.

[0045] When the rotary drilling rig is working, there is also a situation that the pressurizing cylinder is extended or retracted, and the power head motor drives the drill rod and the drill bit to rotate, for example, the drill bit rotates and moves upward and downward above the ground, or the drill bit moves upward and downward and rotates in the formed drill hole. In this case, the load on the power head motor is small, which belongs to the light load working condition. This situation can be summarized as the non-drilling working condition. The light load working condition is included in the non-drilling working condition, which can be determined by detecting the left pump port pressure through the left pump port pressure sensor. In the light load working condition, the left pump port pressure is low, and the rotation of the drill bit can be determined by detecting the left pump port pressure. When the controller obtains only the operation action signal associated with the pressurizing main valve in the operation action signals, or when the controller obtains both the operation action signal associated with the pressurizing main valve and the operation action signal associated with the power head main valve in the operation action signals but the left pump port pressure is less than the preset pressure of the main pump, it is inferred that the rotary drilling rig is in the non-drilling working condition. When the controller obtains both the operation action signal associated with the pressurizing main valve and the operation action signal associated with the power head main valve in the operation action signals but the left pump port pressure is greater than the preset pressure of the main pump, it is inferred that the rotary drilling rig is in the drilling working condition.

[0046] The pressurizing hydraulic system further comprises a left pump pressure sensor 44 connected to the controller 4 for detecting the left pump port pressure and a right pump pressure sensor 45 for detecting the right pump port pressure.

[0047] The control method of the pressurizing hydraulic system of the rotary drilling rig is as follows:

[0048] As Figure 2As shown, the controller uses a pressurized pilot pressure sensor and a power head pilot pressure sensor to detect in real time whether there is pilot pressure oil output at the pilot pressure output port of the pilot valve. When the pressurized pilot pressure detected by the pressurized pilot pressure sensor is less than the preset value, the controller does not output control current to the electro-proportional relief valve and the electro-proportional pressure reducing valve.

[0049] When the pilot pressure detected by the pressurization pilot pressure sensor is greater than the preset value, but the pilot pressure detected by the power head pilot pressure sensor is less than the preset value; or when the pilot pressure detected by the pressurization pilot pressure sensor is greater than the preset value and the pilot pressure detected by the power head pilot pressure sensor is greater than the preset value, but the pressure at the left pump inlet is less than the preset pressure value of the left pump, the controller presumes that the rotary drilling rig is in a non-drilling condition. In the non-drilling condition, the control current output by the controller to the electro-proportional relief valve and the electro-proportional pressure reducing valve is zero. The electro-proportional relief valve operates at the non-drilling condition relief pressure, requiring a larger pressure to open. The valve opening of the electro-proportional pressure reducing valve also reaches its maximum, with the pressure at its inlet and outlet being similar. The valve opening of the pressurization main valve corresponds to the pilot pressure output by the pilot valve (in actual operation, the operating handle usually swings to its maximum angle, the pilot pressure output by the pilot valve also reaches its maximum, and the valve opening of the pressurization main valve reaches its maximum). The pressurized oil output from the right pump enters the pressurized cylinder through the pressurized main valve, causing the pressurized cylinder to operate under high pressure and high flow conditions, enabling the pressurized cylinder to extend and retract rapidly, thereby driving the drill rod and drill bit to rise or fall rapidly.

[0050] When the pressure sensor detects a pressure boosting pilot pressure greater than a preset value, the power head pilot pressure sensor detects a power head pilot pressure greater than a predetermined value, and the left pump inlet pressure is greater than the left pump's preset pressure value, the controller presumes the rotary drilling rig is in drilling mode. In drilling mode, the controller outputs control current to both the electro-proportional relief valve and the electro-proportional pressure reducing valve. The electro-proportional relief valve operates at the drilling mode relief pressure, requiring a relatively small pressure to open. Under the control current, the electro-proportional pressure reducing valve's outlet pressure is lower than its inlet pressure, and the opening of the pressure boosting main valve is lower than the normal operating opening.

[0051] In the drilling working condition, the left pump outputs high pressure and large flow to the motor of the power head through the first power head joint main valve, and the right pump needs to output part of the flow to the pressurizing cylinder through the pressurizing joint main valve while outputting pressure oil to the motor of the power head. In order to limit the output force of the pressurizing cylinder, the electric proportional overflow valve needs to be limited at a lower preset value (relative to the working pressure of the power head). According to the hydraulic characteristics, when the two circuits are supplied with oil at the same time, the oil will flow to the circuit with lower pressure first, so the right pump will preferentially supply oil to the pressurizing joint, resulting in insufficient flow to the power head. At this time, the controller needs to limit the opening of the pressurizing joint main valve through the electric proportional pressure reducing valve, so that the right pump preferentially supplies oil to the power head, and the pressurizing cylinder only needs a small flow to maintain a certain working pressure. Specifically, the controller outputs a control current to the electric proportional pressure reducing valve according to the preset slope, so that the control current of the electric proportional pressure reducing valve gradually increases, the valve opening of the pressurizing joint main valve gradually decreases, the flow of the right pump to the pressurizing cylinder decreases, and the pump port pressure of the right pump gradually rises. At the same time, the controller detects the pressures of the left pump and the right pump through the left pump pressure sensor 44 and the right pump pressure sensor 45, respectively. When the pressure of the left pump is equal to the pressure of the right pump or the pressure difference between the left pump and the right pump is within a predetermined range, the controller maintains the current control current to the electric proportional pressure reducing valve, so that the right pump supplies most of the flow to the power head, and the pressurizing cylinder works at low pressure and small flow.

[0052] Embodiment two.

[0053] Figure 3 The principle diagram of the pressurizing hydraulic system in the second embodiment of the rotary drilling rig of the present application is shown. In the pressurizing hydraulic system of the present embodiment, the pressurizing cylinder and the motor of the power head are controlled by an electric control mode.

[0054] As Figure 3 shown, in the present embodiment, the main valve control device includes an electric control handle connected with the controller, a pressurizing pilot electric proportional pressure reducing valve connected between the pilot control end of the pressurizing joint main valve and the pilot pressure oil source, and a power head pilot electric proportional pressure reducing valve connected between the pilot control end of the power head joint main valve and the pilot pressure oil source; the pressurizing pilot electric proportional pressure reducing valve and the power head pilot electric proportional pressure reducing valve are electrically connected with the controller.

[0055] When the electric control handle is swung, it outputs corresponding operation action electric signals to the controller. The controller outputs corresponding control currents to the corresponding pilot electric proportional pressure reducing valves according to the operation action electric signals of the electric control handle, and the pilot electric proportional pressure reducing valves output pilot pressure oil with corresponding pressure values to act on the pilot hydraulic control end of the corresponding joint main valve in the main valve. At this time, the electric control handle also serves as a detection device, and the controller can also determine the working condition of the rotary drilling rig through the operation action electric signals of the electric control handle.

[0056] When the controller ascertains that the rotary drilling rig works in the non-drilling condition, the controller controls the electric proportional relief valve to work in the non-drilling relief pressure, and the controller outputs the control current to the pressurizing pilot electric proportional pressurizing valve according to the swing angle of the electric control handle, and the valve opening degree of the pressurizing main valve opened is the normal operating opening degree corresponding to the swing angle of the electric control handle.

[0057] When the controller ascertains that the rotary drilling rig works in the drilling condition, the controller controls the electric proportional relief valve to work in the drilling relief pressure. The controller increases a value to the control current output to the pressurizing pilot electric proportional pressurizing valve on the basis of the control current determined according to the swing angle of the electric control handle, so that the valve opening degree of the pressurizing main valve is less than the normal operating opening degree. The control current of the pressurizing pilot electric proportional depressurizing valve gradually increases, and the valve opening degree of the pressurizing main valve gradually decreases. When the left pump pressure is equal to the right pump pressure or the pressure difference between the left pump pressure and the right pump pressure is in a predetermined range, the control current of the pressurizing pilot electric proportional depressurizing valve stops increasing, so that the right pump supplies most of the flow to the power head motor, and the pressurizing oil cylinder works at a low pressure and a small flow.

Claims

1. A pressurized hydraulic system of a rotary drilling rig, comprising a main valve, a left pump, a right pump, a pressurized cylinder, a main valve control device for operating the main valve, characterized in that: The first power head associated main valve in the main valve is connected with the left pump, and the oil inlet main oil way of the pressurization associated main valve and the oil inlet main oil way of the second power head associated main valve are connected with the right pump; the pressurization hydraulic system further comprises: A detection device for detecting state information for judging the working condition of the rotary drilling rig; An electric proportional overflow valve in communication with the working oil port of the pressurization associated main valve for limiting the maximum pressure of the pressurization associated main valve and the pressurization cylinder connecting oil way; A controller in electrical connection with the main valve control device, the detection device and the electric proportional overflow valve; When the working condition is the non-drilling working condition, the controller controls the electric proportional overflow valve to work at the non-drilling working condition overflow pressure. The main valve control device comprises a pilot valve connected with the power head associated main valve and the pressurization associated main valve, and an electric proportional pressure reducing valve arranged on the pilot oil way between the pilot valve and the pilot control end of the pressurization associated main valve, the electric proportional pressure reducing valve is a reverse proportional pressure reducing valve and is in electrical connection with the controller, when the working condition is the drilling working condition, the controller controls the electric proportional overflow valve to work at the drilling working condition overflow pressure, and controls the main valve control device to make the valve port opening degree of the pressurization associated main valve less than the normal operating opening degree. Or the main valve control device comprises an electric control handle for sending an operating action signal to the controller, a pressurization pilot electric proportional pressure reducing valve connected between the pilot control end of the pressurization associated main valve and the pilot pressure oil source, and a power head pilot electric proportional pressure reducing valve connected between the pilot control end of the power head associated main valve and the pilot pressure oil source; the pressurization pilot electric proportional pressure reducing valve and the power head pilot electric proportional pressure reducing valve are in electrical connection with the controller; the detection device comprises the electric control handle; when the working condition is the drilling working condition, the controller controls the electric proportional overflow valve to work at the drilling working condition overflow pressure, and outputs the control current to the pressurization pilot electric proportional pressure reducing valve on the basis of the control current determined according to the swing angle of the electric control handle and an increase value, so that the valve port opening degree of the pressurization associated main valve is less than the normal operating opening degree.

2. The pressurized hydraulic system of the rotary drilling rig according to claim 1, characterized in that The detection device is used for detecting the operating action signal of the main valve control device, and comprises a power head pilot pressure sensor for detecting the pressure of the pilot pressure output port corresponding to the power head associated main valve on the pilot valve and a pressurization pilot pressure sensor for detecting the pressure of the pilot pressure output port corresponding to the pressurization associated main valve on the pilot valve; the power head pilot pressure sensor and the pressurization pilot pressure sensor are in electrical connection with the controller.

3. The auger drill rig pressurized hydraulic system according to any one of claims 1 to 2, characterized in that The pressurization hydraulic system further comprises a main pump pressure sensor in connection with the controller for detecting the pump port pressure of the left pump and the right pump, when the working condition is the drilling working condition, the controller controls the main valve control device to make the valve port opening degree of the pressurization associated main valve reduced to the pressure difference between the pump port pressure of the left pump and the pump port pressure of the right pump within a predetermined range.

4. The pressurized hydraulic system of a rotary drilling rig according to claim 1 or 2, characterized in that The detection device further comprises a left pump pressure sensor in connection with the controller for detecting the pump port pressure of the left pump, when the operating action signal obtained by the controller simultaneously contains the operating action signal associated with the power head associated main valve and the pressurization associated main valve and the pump port pressure of the left pump is greater than a preset value of the left pump, it is determined that the rotary drilling rig is in the drilling working condition, otherwise, it is in the non-drilling working condition.

5. A rotary drilling rig characterized in that The rotary drilling rig pressurization hydraulic system has any one of claims 1 to 4.

6. A control method of a pressurized hydraulic system of a rotary drilling rig according to any one of claims 1 to 4, characterized in that The steps of the control method are: Detecting state information for determining the working condition of the rotary drilling rig and determining whether the working condition of the rotary drilling rig is a non-drilling working condition or a drilling working condition according to the detected information; When the working condition is a non-drilling working condition, the controller controls the electric proportional relief valve to work at a non-drilling working condition relief pressure; When the working condition is a drilling working condition, the controller controls the electric proportional relief valve to work at a drilling working condition relief pressure and controls the main valve control device to make the valve port opening degree of the pressurizing main valve smaller than the normal operating opening degree.

7. The control method of the pressurized hydraulic system of the rotary drilling rig according to claim 6, characterized in that When the working condition is a drilling working condition, the pump port pressure of the left pump and the right pump is detected, and the controller controls the main valve control device to make the valve port opening degree of the pressurizing main valve to make the pressure difference between the left pump port pressure and the right pump port pressure within a predetermined range.

8. The control method of the pressurized hydraulic system of the rotary drilling rig according to claim 6, characterized in that The state information for determining the working condition of the rotary drilling rig is detected by detecting the operating action signals associated with the pressurizing main valve and the head main valve in the main valve control device, and when the controller only obtains the operating action signal associated with the pressurizing main valve, it is determined that the rotary drilling rig is in a non-drilling working condition; when the controller obtains the operating action signals associated with the head main valve and the pressurizing main valve at the same time, it is determined that the rotary drilling rig is in a drilling working condition.

9. The control method of the pressurized hydraulic system of the rotary excavator according to claim 6, characterized in that The state information for determining the working condition of the rotary drilling rig includes detecting the operating action signals associated with the pressurizing main valve and the head main valve in the main valve control device and detecting the left pump port pressure signal, and when the controller obtains the operating action signals associated with the head main valve and the pressurizing main valve at the same time and the left pump pressure is greater than the preset value of the left pump, it is determined that the rotary drilling rig is in a drilling working condition, otherwise it is in a non-drilling working condition.

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