Automatic drilling system of under-pressure operation machine

Abstract

The invention relates to the technical field of hydraulic control, in particular to an automatic drilling system of an under-pressure operation machine. The device comprises an automatic control unit, a drilling adjusting unit and a hydraulic cylinder oil supply unit. According to the invention, the main control module directly controls the hydraulic cylinder reversing pilot valve to indirectly control the hydraulic cylinder hydraulic reversing valve to change the flow direction of hydraulic oil to drive the lifting machine hydraulic cylinder to perform lifting drilling by directly controlling the hydraulic cylinder reversing pilot valve, so that automatic drilling of the under-pressure operation machine is realized; besides, in the drilling process, the main control module adjusts the lifting speed of the hydraulic cylinder of the lifting machine by controlling and adjusting the hydraulic cylinder high-low speed switching valve, so that the drilling time is shortened, the actual drilling time is increased, the drilling effect is improved, and the hydraulic cylinder remote pressure adjusting valve is directly controlled by the main control module, so that the drilling efficiency is improved. And the first hydraulic cylinder overflow valve and the second hydraulic cylinder overflow valve are indirectly controlled to adjust the hydraulic oil flow so as to realize the maximum load of the hydraulic cylinder of the lifting machine and the adjustment of fixed hanging load drilling.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic control, and in particular to an automatic drilling system of a pressure working machine. Background Art

[0002] A pressure-operated machine is a device that can lift and lower the pipe without killing the well or releasing the pressure while maintaining a certain pressure in the wellbore. The pressure-operated machine can solve the technical problems in conventional well-killing operations, improve construction safety conditions, reduce well-killing difficulties, reduce the use of supporting facilities, and solve the overflow problem of water injection wells that has troubled operations for a long time. The pressure-operated machine provides power through the hydraulic system to drive the drill bit or drill rod, increasing the feed cutting force of the drill bit to achieve drilling on the wall. The pressure-operated machine drives the oil pump through the motor to deliver the hydraulic oil to the hydraulic cylinder. The control valve then controls the pressure and flow within a certain range, causing the piston of the hydraulic cylinder to rise or fall, thereby driving the drill bit to perform the lifting action.

[0003] During the drilling process, the lifting speed of the drill bit directly affects the drilling cycle time. A faster lifting speed can reduce the time of each drilling, thereby increasing the actual drilling time and improving the overall drilling efficiency. However, when the lifting speed is increased, the hydraulic pump needs to provide more flow to meet the needs of rapid lifting, which will cause the oil pressure in the system to increase, resulting in hydraulic shock and large pressure fluctuations in the hydraulic system, affecting the stability and life of the hydraulic system. Therefore, the lifting speed of the drill bit is limited, resulting in lower overall drilling efficiency. In order to improve the overall drilling efficiency, an automatic drilling system for a pressure working machine is proposed. Summary of the invention

[0004] The object of the present invention is to provide an automatic drilling system for a pressure working machine to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention aims to provide an automatic drilling system for a pressure working machine, including an automatic control unit, a drilling adjustment unit and a cylinder oil supply unit, the drilling adjustment unit includes a speed switching module, a remote control module and a remote pressure regulating module, the automatic control unit is connected to the remote control module and the remote pressure regulating module, the remote pressure regulating module is connected to the cylinder oil supply unit, the remote control module is connected to the cylinder oil supply unit through the speed switching module, the cylinder oil supply unit is connected to the lifting cylinder, and the cylinder oil supply unit drives the lifting cylinder to move up and down through hydraulic oil; The automatic control unit controls the flow direction of the hydraulic oil of the cylinder oil supply unit through the remote control module, the speed switching module adjusts the lifting speed of the lift cylinder, and the automatic control unit adjusts the load of the lift cylinder in real time through the remote pressure regulation module.

[0006] As a further improvement of the present technical solution, the cylinder oil supply unit includes a hydraulic pump, an oil tank and a cylinder hydraulic reversing valve. The oil tank is connected to the hydraulic pump, the cylinder hydraulic reversing valve and the lift cylinder to provide hydraulic oil. The hydraulic pump is connected to the cylinder hydraulic reversing valve to provide hydraulic power. The cylinder hydraulic reversing valve is connected to the lift cylinder to control the movement direction of the lift cylinder. A down pressure gauge and a lifting force gauge are provided on the connecting oil line between the cylinder hydraulic reversing valve and the lift cylinder.

[0007] As a further improvement of the present technical solution, the remote control module includes a cylinder reversing pilot valve, an upward brake and a downward brake, the speed switching module includes a cylinder high-low speed switching valve, the oil tank is connected to the cylinder reversing pilot valve, the cylinder reversing pilot valve is connected to the upward brake, the downward brake and the cylinder hydraulic reversing valve, the downward brake is connected to the cylinder high-low speed switching valve, and the upward brake and the cylinder high-low speed switching valve are both connected to the cylinder hydraulic reversing valve.

[0008] As a further improvement of the technical solution, the hydraulic cylinder high-low speed switching valve is a proportional reversing valve.

[0009] As a further improvement of the present technical solution, the remote pressure regulating module includes a cylinder remote pressure regulating valve and a first cylinder overflow valve and a second cylinder overflow valve connected to the cylinder remote pressure regulating valve. The oil tank is connected to the cylinder remote pressure regulating valve, and the first cylinder overflow valve and the second cylinder overflow valve are both connected to the cylinder hydraulic reversing valve.

[0010] As a further improvement of the present technical solution, the automatic control unit includes a main control module and a first control module, a second control module, and a pressure detection module connected to the main control module. The main control module is connected to the cylinder high and low speed switching valve. The main control module controls the cylinder reversing pilot valve through the first control module. The main control module controls the cylinder remote pressure regulating valve through the second control module. The main control module monitors the oil circuit pressure in real time through the pressure detection module.

[0011] As a further improvement of the present technical solution, the hydraulic cylinder remote pressure regulating valve and the hydraulic cylinder high and low speed switching valve are both electric valves, and the first control module and the second control module both include a control circuit connected to the main control module and a valve opening adjustment circuit connected to the control circuit, and the valve opening adjustment circuit is connected to the electric valve motor.

[0012] As a further improvement of the technical solution, the control circuit includes three-phase AC contactors KM1, KM2, KM3, position switches SQ1, SQ2, state selection switches SA1, SA2, control switches SB1, SB2, SB3, SB4, SB5, and the valve opening adjustment circuit includes a rectifier bridge BG and a power switch QF. One end of the three-phase AC contactor KM3 is connected to the V11 end and the control switches SB1, SB2, SB3, and SB4, and the other end of the three-phase AC contactor KM3 is connected to the control switch SB5; One end of the three-phase AC contactor KM2 is connected to the other end of the control switch SB3 and the other end of the control switch SB4, and the other end of the three-phase AC contactor KM2 is connected to the position switch SQ1, and the position switch SQ1 is connected to the contact b of the state selection switch SA2; One end of the three-phase AC contactor KM1 is connected to the other end of the control switch SB1 and the other end of the control switch SB2, and the other end of the three-phase AC contactor KM1 is connected to the position switch SQ2, and the position switch SQ2 is connected to the contact b of the state selection switch SA2; The control switch SB5 is connected to the W11 terminal; The rectifier bridge BG is connected to the power switch QF and connected to the potentiometer RP1, the capacitor C1, and the normally open contact of the three-phase AC contactor KM3. One end of the power switch QF is connected to the L1 line, the L2 line, and the L3 line. The other end of the power switch QF is connected to the normally open contact of the three-phase AC contactor KM1 and the normally open contact of the three-phase AC contactor KM2. The potentiometer RP1 is connected to the other end of the capacitor C1 and is also connected to the normally open contact of the three-phase AC contactor KM3. The normally open contact of the three-phase AC contactor KM3 is connected to the motor of the electric valve.

[0013] As a further improvement of the technical solution, the pressure detection module includes a transmitter chip XTR and a pressure sensor P arranged in the oil circuit, wherein: Pin 3 of the transmitter chip XTR is connected to a resistor R14 and connected to the pressure sensor P, and the resistor R14 is connected to one end of a sliding resistor VR1; The 4th pin of the transmitter chip XTR is connected to the resistor R12 and connected to the pressure sensor P, and the resistor R12 is connected to the other end of the sliding resistor VR1; Pin 5 of the transmitter chip XTR is connected to resistor R15, and the other end of the resistor R15 is connected to pin 6 of the transmitter chip XTR; Pin 7 of the transmitter chip XTR is connected to resistor R11, capacitors C11 and C12 and connected to a battery BT; Pin 8 of the transmitter chip XTR is connected to the cathode of the diode D1, the anode of the diode D1 is connected to the resistor R16 and connected to the other end of the capacitor C12, the resistor R16 is connected to the other end of the battery BT and connected to the main control module; Pin 10 of the transmitter chip XTR is connected to the pressure sensor P and to the other end of the resistor R11 and the other end of the capacitor C11; Pin 11 of the transmitter chip XTR is connected to the resistor R13 and to the pressure sensor P.

[0014] As a further improvement of the technical solution, the pressure sensor is a P-5000 pressure sensor, and the transmitter chip XTR is an XTR101 transmitter.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the automatic drilling system of the pressure-operated machine, the main control module directly controls the hydraulic cylinder reversing pilot valve to indirectly control the hydraulic cylinder hydraulic reversing valve to change the flow direction of the hydraulic oil to drive the lifting cylinder to perform lifting and drilling, thereby realizing the automatic drilling of the pressure-operated machine; in addition, during the drilling process, the main control module adjusts the lifting speed of the lifting cylinder by controlling the high and low speed switching valve of the hydraulic cylinder to reduce the drilling time and increase the actual drilling time, thereby improving the drilling effect, and the main control module directly controls the hydraulic cylinder remote pressure regulating valve to indirectly control the first hydraulic cylinder overflow valve and the second hydraulic cylinder overflow valve to adjust the hydraulic oil flow to achieve the maximum load of the lifting cylinder and the adjustment of the fixed hanging weight drilling; 2. In the automatic drilling system of the pressure-operated machine, the main control module also detects the oil circuit pressure in real time through the pressure detection module, and the main control module accurately adjusts the valve opening of the hydraulic cylinder remote pressure regulating valve and the hydraulic cylinder high and low speed switching valve through the control circuit and the valve opening adjustment circuit according to the feedback detection results, so as to control the oil circuit pressure and keep the pressure in the hydraulic system within the normal range, thereby ensuring that the pressure-operated machine can work stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 The hydraulic control system principle of the present invention is schematically shown in FIG. Figure 1 ; Figure 3 The hydraulic control system principle of the present invention is schematically shown in FIG. Figure 2 ; Figure 4 The hydraulic control system principle of the present invention is schematically shown in FIG. Figure 3 ; Figure 5 The hydraulic control system principle of the present invention is schematically shown in FIG. Figure 4 ; Figure 6 is a control circuit diagram of the present invention; Figure 7 The valve opening adjustment circuit diagram of the present invention; Figure 8 This is a circuit diagram of the pressure detection module of the present invention.

[0017] The meaning of each number in the figure is: 1. Hydraulic pump; 2. Oil tank; 3. Cylinder remote pressure regulating valve; 4. First cylinder overflow valve; 5. Cylinder hydraulic reversing valve; 6. Cylinder reversing pilot valve; 7. Upward brake; 8. Downward brake; 9. Cylinder high and low speed switching valve; 10. Lifting cylinder; 11. Lower pressure gauge; 12. Lifting force gauge; 13. Second cylinder overflow valve. DETAILED DESCRIPTION

[0018] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0021] See also Figure 1-Figure 8As shown, the purpose of this embodiment is to provide an automatic drilling system for a pressure working machine, including an automatic control unit, a drilling adjustment unit and a cylinder oil supply unit, the drilling adjustment unit includes a speed switching module, a remote control module and a remote pressure regulating module, the automatic control unit is connected to the remote control module and the remote pressure regulating module, the remote pressure regulating module is connected to the cylinder oil supply unit, the remote control module is connected to the cylinder oil supply unit through the speed switching module, the cylinder oil supply unit is connected to the lifting cylinder 10, the cylinder oil supply unit drives the lifting cylinder 10 to move up and down through hydraulic oil, and then drives the drill bit on the lifting cylinder 10 to drill; The automatic control unit controls the flow direction of the hydraulic oil of the cylinder oil supply unit through the remote control module, the speed switching module adjusts the lifting speed of the lift cylinder 10, and the automatic control unit adjusts the load of the lift cylinder 10 in real time through the remote pressure regulating module.

[0022] Among them, the cylinder oil supply unit includes a hydraulic pump 1, an oil tank 2 and a cylinder hydraulic reversing valve 5. The oil tank 2 is connected to the hydraulic pump 1, the cylinder hydraulic reversing valve 5, and the lift cylinder 10 for providing hydraulic oil. The hydraulic pump 1 is connected to the cylinder hydraulic reversing valve 5 for providing hydraulic power. The cylinder hydraulic reversing valve 5 is connected to the lift cylinder 10 for controlling the movement direction of the lift cylinder 10 by changing the flow direction of the oil. A lower pressure gauge 11 and a lifting force gauge 12 are provided on the oil line connecting the cylinder hydraulic reversing valve 5 and the lift cylinder 10.

[0023] The pressure working machine provides hydraulic oil through the oil tank 2, and the hydraulic pump 1 converts mechanical energy into pressure energy of the hydraulic oil to provide power for the entire hydraulic system. Then the flow direction of the hydraulic oil is changed through the cylinder hydraulic reversing valve 5, so as to control the lifting and lowering of the lifting cylinder 10. In addition, a pressure gauge 11 is set on the road to display the output pressure of the hydraulic pump, and a lifting force gauge 12 is set to display the pressure of the hydraulic circuit and the circulation of the oil, so as to monitor and control the pressure state of the hydraulic system and ensure the stable operation of the system and the safety of the equipment.

[0024] The remote control module includes a cylinder reversing pilot valve 6, an upward brake 7 and a downward brake 8, the speed switching module includes a cylinder high-low speed switching valve 9, the oil tank 2 is connected to the cylinder reversing pilot valve 6, the cylinder reversing pilot valve 6 is connected to the upward brake 7, the downward brake 8 and the cylinder hydraulic reversing valve 5, the downward brake 8 is connected to the cylinder high-low speed switching valve 9, the upward brake 7 and the cylinder high-low speed switching valve 9 are both connected to the cylinder hydraulic reversing valve 5.

[0025] In the hydraulic system, the cylinder reversing pilot valve 6 is used to control the cylinder hydraulic reversing valve 5 for steering, and oil is supplied to the lift cylinder 10 to achieve the effect of remote control. In addition, a cylinder high-low speed switching valve 9 is provided on the connecting oil circuit between the down brake 8 of the cylinder reversing pilot valve 6 and the cylinder hydraulic reversing valve 5. The cylinder high-low speed switching valve 9 is used to switch the hydraulic oil from the high-pressure oil circuit flowing out of the hydraulic pump 1 to the low-speed return oil circuit of the hydraulic cylinder, and control the switching of the working mode of the hydraulic system, thereby adjusting the lifting speed of the lift cylinder 10. The up brake 7 and the down brake 8 are used to control the lifting and stopping of the lift cylinder 10.

[0026] Specifically, when the cylinder high-low speed switching valve 9 is adjusted to the high-speed working mode, the high-pressure oil circuit flowing out of the pump directly enters the hydraulic oil circuit of the hydraulic cylinder through the switching valve, and the lifting speed of the lift cylinder 10 becomes faster, thereby realizing high-speed operation of the hydraulic system; when the cylinder high-low speed switching valve 9 is adjusted to the low-speed working mode, the hydraulic oil circuit of the hydraulic cylinder will be directly connected to the low-speed return oil circuit in the hydraulic oil tank, and the lifting speed of the lift cylinder 10 becomes slower, thereby realizing low-speed operation of the hydraulic system.

[0027] The hydraulic cylinder high and low speed switching valve 9 is a proportional reversing valve. The proportional reversing valve has a fast response speed and can maintain the set flow and pressure for a long time to ensure the stable operation of the system. More importantly, the proportional reversing valve can accept the electrical signal of the main control module as input, and use the electromagnet to control the displacement of the valve core to achieve precise regulation of the hydraulic flow, making the operation of the hydraulic system easier.

[0028] The remote pressure regulating module includes a cylinder remote pressure regulating valve 3 and a first cylinder overflow valve 4 and a second cylinder overflow valve 13 connected to the cylinder remote pressure regulating valve 3. The oil tank 2 is connected to the cylinder remote pressure regulating valve 3, and the first cylinder overflow valve 4 and the second cylinder overflow valve 13 are both connected to the cylinder hydraulic reversing valve 5.

[0029] In the hydraulic system, the cylinder remote pressure regulating valve 3 adjusts and balances the flow in the hydraulic system by controlling the first cylinder overflow valve 4 and the second cylinder overflow valve 13. The first cylinder overflow valve 4 and the second cylinder overflow valve 13 control the pressure of the system by adjusting the flow in the hydraulic system, thereby achieving the maximum load of the lift cylinder 10 and the adjustment of fixed suspended weight drilling.

[0030] The automatic control unit includes a main control module and a first control module, a second control module, and a pressure detection module connected to the main control module. The main control module is connected to the cylinder high and low speed switching valve 9. The main control module controls the cylinder reversing pilot valve 6 through the first control module. The main control module controls the cylinder remote pressure regulating valve 3 through the second control module. The main control module monitors the oil circuit pressure in real time through the pressure detection module.

[0031] The main control module controls the cylinder reversing pilot valve 6 through the first control module, and then controls the cylinder hydraulic reversing valve 5 to change the flow direction of the hydraulic oil to drive the lifting of the lift cylinder 10, so that the lift cylinder 10 can drive the drill bit to drill. During the drilling process, the main control module adjusts the lifting speed of the drill bit by controlling the high and low speed switching valve 9 of the hydraulic cylinder to improve the drilling effect, and the main control module controls the hydraulic cylinder remote pressure regulating valve 3 through the second control module, and then controls the first hydraulic cylinder overflow valve 4 and the second hydraulic cylinder overflow valve 13 to adjust the hydraulic oil flow to achieve the maximum load of the lift cylinder 10 and the adjustment of fixed suspended weight drilling.

[0032] In order to prevent the pressure in the hydraulic system from being too low or too high, the main control module detects the oil circuit pressure in real time through the pressure detection module, and performs feedback adjustment according to the detection results. For example, when the pressure detection module detects that the oil circuit is too high, the main control module reduces the oil circuit pressure by adjusting the hydraulic cylinder remote pressure regulating valve 3 and the hydraulic cylinder high and low speed switching valve 9 to reduce the drill bit lifting and drilling speed and load, thereby ensuring that the pressure-carrying machine can work stably for a long time.

[0033] The hydraulic cylinder remote pressure regulating valve 3 and the hydraulic cylinder high and low speed switching valve 9 are both electric valves, and the first control module and the second control module both include a control circuit connected to the main control module and a valve opening adjustment circuit connected to the control circuit. The valve opening adjustment circuit is connected to the electric valve motor. The main control module controls the opening and closing of the hydraulic cylinder remote pressure regulating valve 3 and the hydraulic cylinder high and low speed switching valve 9 through the control circuit and the valve opening adjustment circuit, and adjusts the valve opening of the hydraulic cylinder remote pressure regulating valve 3 and the hydraulic cylinder high and low speed switching valve 9 in real time according to the oil circuit pressure detected by the pressure detection module.

[0034] Figure 2-5 The four parts of the same hydraulic control system principle diagram are connected by the same-name terminals. Figure 2 For example, end a in the middle Figure 4 Connected to the middle a end.

[0035] The control circuit includes three-phase AC contactors KM1, KM2, KM3, position switches SQ1, SQ2, state selection switches SA1, SA2, control switches SB1, SB2, SB3, SB4, SB5, and the valve opening adjustment circuit includes a rectifier bridge BG and a power switch QF. One end of the three-phase AC contactor KM3 is connected to the V11 terminal and the control switches SB1, SB2, SB3, and SB4, and the other end of the three-phase AC contactor KM3 is connected to the control switch SB5; One end of the three-phase AC contactor KM2 is connected to the other end of the control switch SB3 and the other end of the control switch SB4, and the other end of the three-phase AC contactor KM2 is connected to the position switch SQ1, and the position switch SQ1 is connected to the contact point b of the state selection switch SA2; One end of the three-phase AC contactor KM1 is connected to the other end of the control switch SB1 and the other end of the control switch SB2, and the other end of the three-phase AC contactor KM1 is connected to the position switch SQ2, and the position switch SQ2 is connected to the contact b of the state selection switch SA2; Control switch SB5 is connected to terminal W11; The rectifier bridge BG is connected to the power switch QF and connected to the potentiometer RP1, the capacitor C1, and the normally open contact of the three-phase AC contactor KM3. One end of the power switch QF is connected to the L1 line, the L2 line, and the L3 line. The other end of the power switch QF is connected to the normally open contact of the three-phase AC contactor KM1 and the normally open contact of the three-phase AC contactor KM2. Potentiometer RP1 is connected to the other end of capacitor C1 and connected to the normally open contact of three-phase AC contactor KM3. The normally open contact of three-phase AC contactor KM3 is connected to the motor of the electric valve ( Figure 7 Middle M).

[0036] When the state selection switch SA1 or SA2 is at contact point a, the coil of the three-phase AC contactor KM1 or KM2 is out of operation; when the state selection switch SA1 or SA2 is at contact point b, the coil of the three-phase AC contactor KM1 or KM2 is put into operation; During normal operation, turn on the power switch QF.

[0037] The main control module sets the state selection switch SA1 to the contact point b position and closes the control switch SB1 or SB2. The motor of the electric valve drives the valve to rotate and open the valve. When the valve is opened to the limit position, the position switch SQ2 is disconnected, causing the coil of the three-phase AC contactor KM1 to lose power, and its main contact is reset. The motor power is disconnected and the electric valve stops moving. The main control module sets the state selection switch SA2 to the contact point b position and closes the control switch SB3 or SB4. The motor of the electric valve drives the valve to rotate in the opposite direction and closes the valve. When the valve is closed to the limit position, the position switch SQ1 is disconnected, causing the coil of the three-phase AC contactor KM2 to lose power, and its main contact is reset. The motor power supply is disconnected and the electric valve stops moving. During the process of the main control module controlling the valve opening and closing of the hydraulic cylinder remote pressure regulating valve 3 and the hydraulic cylinder high and low speed switching valve 9, the main control module adjusts the oil circuit pressure feedback measured by the pressure detection module, and controls the closing control switch SB5 in real time, so that the three-phase AC contactor KM1 or KM2 coil is de-energized and released. When the motor is de-energized, the three-phase AC contactor KM3 coil is energized and attracted, so that the output of the rectifier bridge BG and the energy storage of the capacitor C1 act on the winding of the motor at the same time, generating a braking torque, and stopping the motor instantly. In this way, the valve can be stopped accurately at the specified position as required, that is, the main control module controls the valve opening of the hydraulic cylinder remote pressure regulating valve 3 and the hydraulic cylinder high and low speed switching valve 9 in real time, thereby achieving the effect of real-time adjustment of the drilling speed and load of the drill bit.

[0038] The pressure detection module includes a transmitter chip XTR and a pressure sensor P arranged in the oil circuit, wherein: Pin 3 of the transmitter chip XTR is connected to resistor R14 and connected to the pressure sensor P. Resistor R14 is connected to one end of the sliding resistor VR1. Pin 4 of the transmitter chip XTR is connected to resistor R12 and connected to the pressure sensor P. Resistor R12 is connected to the other end of the sliding resistor VR1; Pin 5 of the transmitter chip XTR is connected to resistor R15, and the other end of resistor R15 is connected to pin 6 of the transmitter chip XTR; Pin 7 of the transmitter chip XTR is connected to resistor R11, capacitors C11 and C12 and connected to the battery BT; Pin 8 of the transmitter chip XTR is connected to the cathode of diode D1, the anode of diode D1 is connected to resistor R16 and the other end of capacitor C12, resistor R16 is connected to the other end of battery BT and the main control module; Pin 10 of the transmitter chip XTR is connected to the pressure sensor P and connected to the other end of the resistor R11 and the other end of the capacitor C11; Pin 11 of the transmitter chip XTR is connected to resistor R13 and in parallel to the pressure sensor P.

[0039] The above-mentioned pressure sensor is a P-5000 pressure sensor, which has high accuracy and high stability, good linearity, and high temperature stability. The transmitter chip XTR is an XTR101 transmitter, which has the advantages of high precision and low temperature drift.

[0040] The pressure detection module detects in real time through the pressure sensor P set in the oil circuit, and transmits the detection signal to the main control module over a long distance through the transmission chip XTR.

[0041] In summary, the automatic drilling system of the pressure working machine provided by the present invention is that the main control module directly controls the cylinder reversing pilot valve 6 to indirectly control the cylinder hydraulic reversing valve 5 to change the flow direction of the hydraulic oil to drive the lifting machine cylinder 10 to perform lifting and drilling, thereby realizing the automatic drilling of the pressure working machine; During the drilling process, the main control module adjusts the lifting speed of the lifting cylinder 10 by controlling the high and low speed switching valve 9 of the hydraulic cylinder to reduce the drilling time and increase the actual drilling time, thereby improving the drilling effect. The main control module directly controls the hydraulic cylinder remote pressure regulating valve 3 to indirectly control the first hydraulic cylinder overflow valve 4 and the second hydraulic cylinder overflow valve 13 to adjust the hydraulic oil flow to achieve the maximum load of the lifting cylinder 10 and the adjustment of the fixed hanging weight drilling; It is worth noting that the main control module also detects the oil circuit pressure in real time through the pressure detection module, and according to the feedback detection results, the main control module accurately adjusts the valve opening of the cylinder remote pressure regulating valve 3 and the cylinder high and low speed switching valve 9 through the control circuit and the valve opening adjustment circuit to regulate the oil circuit pressure and keep the pressure in the hydraulic system within the normal range, thereby ensuring that the pressure-carrying machine can work stably for a long time.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An automatic drilling system for a pressure working machine, characterized in that: It comprises an automatic control unit, a drilling adjustment unit and a cylinder oil supply unit, the drilling adjustment unit comprises a speed switching module, a remote control module and a remote pressure regulating module, the automatic control unit is connected to the remote control module and the remote pressure regulating module, the remote pressure regulating module is connected to the cylinder oil supply unit, the remote control module is connected to the cylinder oil supply unit via the speed switching module, the cylinder oil supply unit is connected to a lifting machine cylinder (10), and the cylinder oil supply unit drives the lifting machine cylinder (10) to move up and down by means of hydraulic oil; The automatic control unit controls the flow direction of the hydraulic oil of the cylinder oil supply unit through the remote control module, the speed switching module adjusts the lifting speed of the lift cylinder (10), and the automatic control unit adjusts the load of the lift cylinder (10) in real time through the remote pressure regulating module.

2. The automatic drilling system of the belt pressure working machine according to claim 1, characterized in that: The cylinder oil supply unit comprises a hydraulic pump (1), an oil tank (2) and a cylinder hydraulic reversing valve (5); the oil tank (2) is connected to the hydraulic pump (1), the cylinder hydraulic reversing valve (5) and the lift cylinder (10) for providing hydraulic oil; the hydraulic pump (1) is connected to the cylinder hydraulic reversing valve (5) for providing hydraulic power; the cylinder hydraulic reversing valve (5) is connected to the lift cylinder (10) for controlling the movement direction of the lift cylinder (10); a lower pressure gauge (11) and a lifting force gauge (12) are provided on the connecting oil circuit between the cylinder hydraulic reversing valve (5) and the lift cylinder (10).

3. The automatic drilling system of the belt pressure working machine according to claim 2, characterized in that: The remote control module comprises a cylinder reversing pilot valve (6), an upward brake (7) and a downward brake (8); the speed switching module comprises a cylinder high-low speed switching valve (9); the oil tank (2) is connected to the cylinder reversing pilot valve (6); the cylinder reversing pilot valve (6) is connected to the upward brake (7), the downward brake (8) and the cylinder hydraulic reversing valve (5); the downward brake (8) is connected to the cylinder high-low speed switching valve (9); the upward brake (7) and the cylinder high-low speed switching valve (9) are both connected to the cylinder hydraulic reversing valve (5).

4. The automatic drilling system of the belt pressure working machine according to claim 3 is characterized in that: The hydraulic cylinder high-low speed switching valve (9) is a proportional reversing valve.

5. The automatic drilling system for a belt pressure working machine according to claim 4, characterized in that: The remote pressure regulating module comprises a cylinder remote pressure regulating valve (3) and a first cylinder overflow valve (4) and a second cylinder overflow valve (13) connected to the cylinder remote pressure regulating valve (3); the oil tank (2) is connected to the cylinder remote pressure regulating valve (3); and the first cylinder overflow valve (4) and the second cylinder overflow valve (13) are both connected to the cylinder hydraulic reversing valve (5).

6. The automatic drilling system of the belt pressure working machine according to claim 5, characterized in that: The automatic control unit comprises a main control module and a first control module, a second control module and a pressure detection module connected to the main control module. The main control module is connected to the cylinder high-speed and low-speed switching valve (9). The main control module controls the cylinder reversing pilot valve (6) through the first control module. The main control module controls the cylinder remote pressure regulating valve (3) through the second control module. The main control module monitors the oil circuit pressure in real time through the pressure detection module.

7. The automatic drilling system of the belt pressure working machine according to claim 6, characterized in that: The hydraulic cylinder remote pressure regulating valve (3) and the hydraulic cylinder high-low speed switching valve (9) are both electric valves, and the first control module and the second control module both include a control circuit connected to the main control module and a valve opening adjustment circuit connected to the control circuit, and the valve opening adjustment circuit is connected to the electric valve motor.

8. The automatic drilling system of the belt pressure working machine according to claim 7, characterized in that: The control circuit includes three-phase AC contactors KM1, KM2, KM3, position switches SQ1, SQ2, state selection switches SA1, SA2, control switches SB1, SB2, SB3, SB4, SB5, and the valve opening adjustment circuit includes a rectifier bridge BG and a power switch QF. One end of the three-phase AC contactor KM3 is connected to the V11 end and the control switches SB1, SB2, SB3, and SB4, and the other end of the three-phase AC contactor KM3 is connected to the control switch SB5; One end of the three-phase AC contactor KM2 is connected to the other end of the control switch SB3 and the other end of the control switch SB4, and the other end of the three-phase AC contactor KM2 is connected to the position switch SQ1, and the position switch SQ1 is connected to the contact b of the state selection switch SA2; One end of the three-phase AC contactor KM1 is connected to the other end of the control switch SB1 and the other end of the control switch SB2, and the other end of the three-phase AC contactor KM1 is connected to the position switch SQ2, and the position switch SQ2 is connected to the contact b of the state selection switch SA2; The control switch SB5 is connected to the W11 terminal; The rectifier bridge BG is connected to the power switch QF and connected to the potentiometer RP1, the capacitor C1, and the normally open contact of the three-phase AC contactor KM3. One end of the power switch QF is connected to the L1 line, the L2 line, and the L3 line. The other end of the power switch QF is connected to the normally open contact of the three-phase AC contactor KM1 and the normally open contact of the three-phase AC contactor KM2. The potentiometer RP1 is connected to the other end of the capacitor C1 and is also connected to the normally open contact of the three-phase AC contactor KM3. The normally open contact of the three-phase AC contactor KM3 is connected to the motor of the electric valve.

9. The automatic drilling system of the belt pressure working machine according to claim 6, characterized in that: The pressure detection module includes a transmitter chip XTR and a pressure sensor P arranged in the oil circuit, wherein: Pin 3 of the transmitter chip XTR is connected to a resistor R14 and connected to the pressure sensor P, and the resistor R14 is connected to one end of a sliding resistor VR1; The 4th pin of the transmitter chip XTR is connected to the resistor R12 and connected to the pressure sensor P, and the resistor R12 is connected to the other end of the sliding resistor VR1; Pin 5 of the transmitter chip XTR is connected to resistor R15, and the other end of the resistor R15 is connected to pin 6 of the transmitter chip XTR; Pin 7 of the transmitter chip XTR is connected to resistor R11, capacitors C11 and C12 and connected to a battery BT; Pin 8 of the transmitter chip XTR is connected to the cathode of the diode D1, the anode of the diode D1 is connected to the resistor R16 and connected to the other end of the capacitor C12, the resistor R16 is connected to the other end of the battery BT and connected to the main control module; Pin 10 of the transmitter chip XTR is connected to the pressure sensor P and to the other end of the resistor R11 and the other end of the capacitor C11; Pin 11 of the transmitter chip XTR is connected to the resistor R13 and to the pressure sensor P.

10. The automatic drilling system of the belt pressure working machine according to claim 9, characterized in that: The pressure sensor is a P-5000 pressure sensor, and the transmitter chip XTR is an XTR101 transmitter.

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