Hydraulic drilling rig drilling control system and method

Abstract

The hydraulic drilling machine drilling control system and method are provided, the system comprises a variable pump, a feed control valve, a unidirectional valve one, a unidirectional valve two, a unidirectional valve three, an electric proportional overflow valve and a hydraulic control unidirectional valve, a reversing valve one and a reversing valve two, the reversing valve one comprises a pilot electric proportional pressure reducing valve one, a pilot electric proportional pressure reducing valve two and a reversing valve body one, the reversing valve two comprises a pilot electric proportional pressure reducing valve three, a pilot electric proportional pressure reducing valve four and a reversing valve body two.The present application can realize multi-mode drilling, and the drilling process is safe, stable and energy-saving.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hydraulic top drive, and particularly relates to a hydraulic drilling rig drilling control system and method. BACKGROUND

[0002] As a kind of survey and exploration for mineral resources, hydraulic drilling rig has been widely used in the drilling construction of geological exploration industry, because its top drive, main winch, rope winch, mud pump, electrical system, hydraulic system and other integrated components are integrated on the running assembly, it is convenient to transfer, at present, the hydraulic drilling rig drilling system adopts overflow valve for constant pressure control, in the process of deep well drilling rig operation, the geological condition is relatively complex, the adaptability of single constant pressure drilling to part of geological conditions is poor, the operator needs to adjust in real time according to the field parameters, the requirement for operator's concentration and operation experience is higher, and the labor intensity is larger. SUMMARY

[0003] The present application provides a kind of hydraulic drilling rig drilling control system and method, can realize multi-mode drilling, and the process of drilling is safe, stable and energy-saving.To achieve the above purpose, the following technical solutions are adopted:

[0004] A kind of hydraulic drilling rig drilling control system, comprising:

[0005] Variable pump 5;

[0006] Feed control valve 2, including the oil flow direction of control one-way valve 2.1, one-way valve 2.4, one-way valve 3 2.5, electric proportional overflow valve 2.2 and hydraulic control one-way valve 2.3;

[0007] Wherein, the oil inlet of one-way valve 3 2.5 is connected to the A port of feed control valve 2, the oil outlet is connected to the A2 port, M port of control valve 2, the oil inlet of one-way valve 2.4 and the oil inlet of electric proportional overflow valve 2.2;

[0008] The oil outlet of one-way valve 2.4 is connected to the A1 port of control valve 2;The oil outlet of electric proportional overflow valve 2.2 is connected to the oil tank;

[0009] The oil inlet of one-way valve 1 2.1 is connected to the S port of feed control valve 2, and the oil outlet is connected to the B1 port of feed control valve 2;

[0010] The oil inlet of hydraulic control one-way valve 2.3 is connected to the B port of feed control valve 2, and the oil outlet is connected to the B1 port of feed control valve 2;

[0011] Reversing valve one 3 and reversing valve two 7, reversing valve one 3 includes pilot electric proportional pressure reducing valve one 3.1, pilot electric proportional pressure reducing valve two 3.2 and reversing valve body one 3.3, the a port of reversing valve body one 3.3 is connected to the 2nd port of pilot electric proportional pressure reducing valve two 3.2, and the b port of reversing valve body one 3.3 is connected to the 2nd port of pilot electric proportional pressure reducing valve one 3.1;

[0012] The reversing valve two 7 includes a pilot electric proportional pressure reducing valve three 7.1, a pilot electric proportional pressure reducing valve four 7.2, and a reversing valve body two 7.3, the a port of the reversing valve body two 7.3 is connected with the No.2 port of the pilot electric proportional pressure reducing valve three 7.1, and the b port of the reversing valve body two 7.3 is connected with the No.2 port of the pilot electric proportional pressure reducing valve four 7.2;

[0013] The P port of the reversing valve one 3 is connected with the P port of the variable pump 5, and the LS port of the reversing valve one 3 is connected with the LS port of the variable pump 5;

[0014] The A port of the reversing valve one 3 is connected with the A port of the feeding control valve 2, and the B port of the reversing valve one 3 is connected with the B port of the feeding control valve 2;

[0015] The A1 port of the feeding control valve 2 is connected with the A port of the oil cylinder 1, the B1 port is connected with the B port of the oil cylinder 1, the A2 port is connected with the A port of the reversing valve two 7, the S port and the T port are both connected with the oil tank, and the M port is connected with the pressure sensor one 6;

[0016] The P port of the reversing valve two 7 is connected with the A1 port of the feeding control valve 2, the T port is connected with the oil tank, the pressure sensor two 8 is connected with the B port of the oil cylinder 1, and the pressure sensor three 9 is connected with the A port of the oil cylinder 1;

[0017] The encoder 10 is located outside the oil cylinder 1 and arranged on the piston rod thereof;

[0018] In the pressurized constant pressure working condition, the B port of the oil cylinder 1 is supplied with oil, the A port is returned with oil, the pilot electric proportional pressure reducing valve one 3.1 and the pilot electric proportional pressure reducing valve three 7.1 are powered, the left position of the reversing valve body one 3.3 is connected with the feeding control valve 2, and the left position of the reversing valve body two 7.3 is connected with the electric proportional overflow valve 2.2 of the feeding control valve 2;

[0019] In the decompressed constant pressure working condition, the reversing valve one 3 is in the middle position, the A port of the oil cylinder 1 is returned with oil, the pilot electric proportional pressure reducing valve three 7.1 is powered, and the left position of the reversing valve body two 7.3 is connected with the electric proportional overflow valve 2.2 of the feeding control valve 2;

[0020] In the pressurized constant speed working condition, the B port of the oil cylinder 1 is supplied with oil, the A port is returned with oil, the pilot electric proportional pressure reducing valve one 3.1 and the pilot electric proportional pressure reducing valve four 7.2 are powered, the left position of the reversing valve body one 3.3 is connected with the feeding control valve 2, and the right position of the reversing valve body two 7.3 is connected with the oil tank;

[0021] In the decompressed constant speed working condition, the reversing valve one 3 is in the middle position, the A port of the oil cylinder 1 is returned with oil, the pilot electric proportional pressure reducing valve four 7.2 is powered, and the right position of the reversing valve body two 7.3 is connected with the oil tank.

[0022] Preferably, the system further comprises:

[0023] The pressure compensator 1 3.4 has its inlet connected to the P port of the reversing valve 1 3, and its outlet connected to the left port of the reversing valve body 1 3.3 in the pressurized constant pressure mode and the pressurized constant speed mode.

[0024] Preferably, further comprising:

[0025] The pressure compensator 2 7.4 has its inlet connected to the P port of the reversing valve 2 7, and its outlet connected to the left port of the reversing valve body 2 7.3 in the pressurized constant pressure mode and the depressurized constant pressure mode, and connected to the right port of the reversing valve body 2 7.3 in the pressurized constant speed mode and the depressurized constant speed mode.

[0026] Preferably, further comprising: the electric proportional overflow valve 2 2 has its A port connected to the MSB port of the reversing valve 3.

[0027] A hydraulic drilling rig drilling control method, comprising the following steps:

[0028] The pressurized constant pressure step and the depressurized constant pressure step;

[0029] The pressurized constant pressure step comprises the B port oil inlet process of the oil cylinder 1 and the A port oil return process of the oil cylinder 1.

[0030] The B port oil inlet process of the oil cylinder 1: the oil enters the P port of the reversing valve 1 3 from the P port of the variable pump 5, and then enters the left port of the reversing valve body 1 3.3 from the 1# port and the 2# port of the pressure compensator 1 3.4, and then enters the B port of the feed control valve 2 from the B port of the reversing valve body 1 3.3.

[0031] The oil enters the B port of the oil cylinder 1 from the B1 port of the control valve 2 through the hydraulic control check valve 2.3.

[0032] The A port oil return process of the oil cylinder 1: the oil enters the A1 port of the feed control valve 2 from the A port of the oil cylinder 1, and then enters the P port of the reversing valve 2 7.

[0033] The oil enters the A2 port of the feed control valve 2 from the A port of the reversing valve body 2 7.2 through the 1# port and the 2# port of the electric proportional overflow valve 2 2.

[0034] The oil returns to the oil tank from the A2 port of the control valve 2 through the 1# port and the 2# port of the electric proportional overflow valve 2 2.

[0035] The depressurized constant pressure step comprises the A port oil return process of the oil cylinder 1, and the reversing valve 1 3 is in the middle position, and no oil enters the B port of the oil cylinder 1, which specifically comprises:

[0036] The oil enters the A1 port of the feed control valve 2 from the A port of the oil cylinder 1, and then enters the P port of the reversing valve 2 7.

[0037] The oil liquid enters the left position of the valve body two 7.2 from the P port of the reversing valve two 7, enters the A port of the feed control valve 2 from the B port of the valve body two 7.2, and enters the A2 port of the feed control valve 2 from the A port of the reversing valve two 7.2.

[0038] The oil liquid enters the A2 port of the feed control valve 2, enters the No. 1 port and the No. 2 port of the electric proportional overflow valve 2.2 from the A2 port of the feed control valve 2, and returns to the oil tank.

[0039] Preferably, the method comprises the following steps:

[0040] The step of pressurizing constant speed comprises the B port oil inlet process of the oil cylinder 1 and the A port oil return process of the oil cylinder 1.

[0041] The B port oil inlet process of the oil cylinder 1 is that the oil liquid enters the P port of the reversing valve one 3 from the P port of the variable pump 5, enters the left position of the valve body one 3.3 from the No. 1 port and the No. 2 port of the pressure compensator one 3.4, enters the B port of the feed control valve 2 from the B port of the valve body one 3.3.

[0042] The oil liquid enters the B port of the oil cylinder 1 from the B1 port of the feed control valve 2 through the hydraulic control check valve 2.3.

[0043] The A port oil return process of the oil cylinder 1 is that the oil liquid enters the A1 port of the feed control valve 2 from the A port of the oil cylinder 1, and then enters the P port of the reversing valve two 7.

[0044] The oil liquid enters the right position of the valve body two 7.2 from the P port of the reversing valve two 7, returns to the oil tank from the B port of the valve body two 7.2.

[0045] Preferably, the method comprises the following steps:

[0046] The step of depressurizing constant speed comprises the A port oil return process of the oil cylinder 1, and the B port of the oil cylinder 1 is not supplied with oil liquid when the reversing valve one 3 is in the middle position, and specifically comprises the following steps:

[0047] The oil liquid enters the A1 port of the feed control valve 2 from the A port of the oil cylinder 1, and then enters the P port of the reversing valve two 7.

[0048] The oil liquid enters the right position of the valve body two 7.2 from the P port of the reversing valve two 7, returns to the oil tank from the B port of the valve body two 7.2.

[0049] Compared with the prior art, the method has the following advantages:

[0050] The system can set the large drilling pressure and the maximum drilling speed, so that the drilling speed and the drilling pressure parameters are controlled in the set range, and the construction safety is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 The principle diagram of the hydraulic drilling rig drilling control system is shown in the figure.

[0052] Figure 2 The control electrical connection diagram is shown in the figure.

[0053] Figure 3 The structure diagram of the feed control valve is shown in the figure.

[0054] Figure 4 The structure diagram of the reversing valve one is shown in the figure.

[0055] Figure 5 The structure diagram of the reversing valve two is shown in the figure.

[0056] 1 - oil cylinder, 2 - feed control valve, 2.1 - one-way valve one, 2.2 - electric proportional overflow valve, 2.3 - hydraulic control one-way valve, 2.4 - one-way valve two, 2.5 - one-way valve three,

[0057] 3 - reversing valve one, 3.1 - pilot electric proportional pressure reducing valve one, 3.2 - pilot electric proportional pressure reducing valve two, 3.3 - reversing valve body one, 3.4 - compensator one, 3.5 - pressure reducing valve,

[0058] 4 - electric proportional overflow valve, 5 - variable pump, 6 - pressure sensor one, 7 - reversing valve two, 7.1 - pilot electric proportional pressure reducing valve three, 7.2 - pilot electric proportional pressure reducing valve four, 7.3 - reversing valve body one, 7.4 - pressure compensator two, 8 - pressure sensor two, 9 - pressure sensor three, 10 - encoder,

[0059] 11 - fuse, 12 - controller, 13 - proportional electromagnet one, 14 - proportional electromagnet two, 15 - proportional electromagnet three, 16 - proportional electromagnet four, 17 - proportional electromagnet five, 18 - proportional electromagnet six, 19 - electric proportional input handle one, 20 - electric proportional input handle two, 21 - electric proportional knob one, 22 - electric proportional knob two. EMBODIMENT

[0060] The application will be described in more detail below with reference to the attached drawings, in which the preferred embodiments of the application are shown. It should be understood that the person skilled in the art can modify the application described herein while still achieving the advantageous effects of the application. Therefore, the following description should be understood as a broad knowledge for the person skilled in the art and not as a limitation of the application.

[0061] As Figure 1 , Figures 3-5 shown, a hydraulic drilling rig drilling control system for realizing multi-mode drilling, from the prior art, the drilling process, the cylinder rod of the oil cylinder 1 is in the retraction state.

[0062] In the embodiment, "pressurization" refers to the B port of the oil cylinder 1. "Pressure reduction" refers to the B port of the oil cylinder 1 not feeding oil, and its A port returning oil.

[0063] "Constant pressure" refers to adjusting the current of the electric proportional overflow valve 2.2 to realize constant oil pressure of the B port and the A port of the oil cylinder 1.

[0064] "Constant speed" refers to adjusting the current of the pilot electric proportional pressure reducing valve three 7.1 or the pilot electric proportional pressure reducing valve four 7.2 to make the speed of the cylinder rod of the oil cylinder 1 constant.

[0065] The system specifically includes:

[0066] Variable pump 5;

[0067] Electric proportional overflow valve 4, the A port of which is connected to the MSB port of the reversing valve 3.

[0068] Feed control valve 2, including unidirectional valve one 2.1, unidirectional valve two 2.4, unidirectional valve three 2.5, electric proportional overflow valve 2.2, and hydraulic control unidirectional valve 2.3.

[0069] Among them, the oil inlet of the unidirectional valve three 2.5 is connected to the A port of the feed control valve 2, the oil outlet is connected to the A2 port, M port of the control valve 2, the oil inlet of the unidirectional valve two 2.4, and the oil inlet of the electric proportional overflow valve 2.2;

[0070] The oil outlet of the unidirectional valve two 2.4 is connected to the A1 port of the control valve 2; the oil outlet of the electric proportional overflow valve 2.2 is connected to the oil tank;

[0071] The oil inlet of the unidirectional valve one 2.1 is connected to the S port of the feed control valve 2, and the oil outlet is connected to the B1 port of the feed control valve 2;

[0072] The oil inlet of the hydraulic control unidirectional valve 2.3 is connected to the B port of the feed control valve 2, and the oil outlet is connected to the B1 port of the feed control valve 2;

[0073] Reversing valve one 3 and reversing valve two 7, the reversing valve one 3 includes pilot electric proportional pressure reducing valve one 3.1, pilot electric proportional pressure reducing valve two 3.2, and reversing valve body one 3.3; the reversing valve two 7 includes pilot electric proportional pressure reducing valve three 7.1, pilot electric proportional pressure reducing valve four 7.2, and reversing valve body two 7.3;

[0074] The a port of the reversing valve body 3.3 is connected with the No. 2 port of the pilot electric proportional pressure reducing valve 3.2, and the b port of the reversing valve body 3.3 is connected with the No. 2 port of the pilot electric proportional pressure reducing valve 3.1; the No. 1 port of the pilot electric proportional pressure reducing valve 3.1 is connected with L port, and the No. 3 port is connected with the No. 2 port of the 3.5 pressure reducing valve. The No. 1 port of the pilot electric proportional pressure reducing valve 3.2 is connected with L port, and the No. 3 port is connected with the No. 2 port of the 3.5 pressure reducing valve.

[0075] The a port of the reversing valve body 7.3 is connected with the No. 2 port of the pilot electric proportional pressure reducing valve 7.1, and the b port of the reversing valve body 7.3 is connected with the No. 2 port of the pilot electric proportional pressure reducing valve 7.2.

[0076] The P port of the reversing valve 3 is connected with the P port of the variable pump 5, and the LS port of the reversing valve 3 is connected with the LS port of the variable pump 5.

[0077] The A port of the reversing valve 3 is connected with the A port of the feeding control valve 2, and the B port of the reversing valve 3 is connected with the B port of the feeding control valve 2.

[0078] The A1 port of the feeding control valve 2 is connected with the A port of the oil cylinder 1, the B1 port is connected with the B port of the oil cylinder 1, the A2 port is connected with the A port of the reversing valve 7, the S port and the T port are both connected with the oil tank, and the M port is connected with the pressure sensor 1.

[0079] The P port of the reversing valve 7 is connected with the A1 port of the feeding control valve 2, the T port is connected with the oil tank, the pressure sensor 2 is connected with the B port of the oil cylinder 1, and the pressure sensor 3 is connected with the A port of the oil cylinder 1.

[0080] The encoder 10 is located outside the oil cylinder 1 and is arranged on the piston rod thereof.

[0081] In the pressurized constant pressure working condition, the B port of the oil cylinder 1 is supplied with oil, the A port is returned with oil, the pilot electric proportional pressure reducing valve 3.1 and the pilot electric proportional pressure reducing valve 7.1 are powered, the left position of the reversing valve body 3.3 is connected with the feeding control valve 2, and the left position of the reversing valve body 7.3 is connected with the electric proportional overflow valve 2.2 of the feeding control valve 2.

[0082] In the pressure reducing constant pressure working condition, the reversing valve 3 is in the middle position, the A port of the oil cylinder 1 is returned with oil, the pilot electric proportional pressure reducing valve 7.1 is powered, and the left position of the reversing valve body 7.3 is connected with the electric proportional overflow valve 2.2 of the feeding control valve 2.

[0083] In the pressurized constant speed working condition, the B port of the oil cylinder 1 is supplied with oil, the A port is returned with oil, the pilot electric proportional pressure reducing valve 3.1 and the pilot electric proportional pressure reducing valve 7.2 are powered, the left position of the reversing valve body 3.3 is connected with the feeding control valve 2, and the right position of the reversing valve body 7.3 is connected with the oil tank.

[0084] In the constant speed under pressure working condition, the reversing valve one 3 is in the middle position, the A port of the oil cylinder 1 returns oil, the pilot electric proportional pressure reducing valve four 7.2 is powered, and the right position of the reversing valve body two 7.3 is connected with the oil tank.

[0085] In the embodiment, the pressure compensator one 3.4 and the pressure compensator two 7.4 are further included.

[0086] The pressure compensator one 3.4 has an oil inlet connected with the P port of the reversing valve one 3, and has an oil outlet connected with the left position of the reversing valve body one 3.3 in the constant pressure under pressure working condition and the constant speed under pressure working condition.

[0087] The pressure compensator two 7.4 has an oil inlet connected with the P port of the reversing valve two 7, and has an oil outlet connected with the left position of the reversing valve body two 7.3 in the constant pressure under pressure working condition and the constant pressure under decompression working condition, and has an oil outlet connected with the right position of the reversing valve body two 7.3 in the constant speed under pressure working condition and the constant speed under decompression working condition.

[0088] A hydraulic drilling rig drilling control method, comprising the following steps:

[0089] 1. The constant pressure under pressure step:

[0090] Including the B port oil inlet process of the oil cylinder 1 and the A port oil return process of the oil cylinder 1.

[0091] The B port oil inlet process of the oil cylinder 1: the oil liquid enters the P port of the reversing valve one 3 from the P port of the variable pump 5, enters the left position of the reversing valve body one 3.3 from the No. 1 port and the No. 2 port of the pressure compensator one 3.4, and enters the B port of the feed control valve 2 from the B port of the reversing valve body one 3.3.

[0092] The oil liquid enters the B port of the oil cylinder 1 from the B1 port of the control valve 2 through the hydraulic control check valve 2.3.

[0093] The A port oil return process of the oil cylinder 1: the oil liquid enters the A1 port of the feed control valve 2 from the A port of the oil cylinder 1, and then enters the P port of the reversing valve two 7.

[0094] The oil liquid enters the left position of the reversing valve body two 7.2 from the P port of the reversing valve two 7 through the No. 1 port and the No. 2 port of the pressure compensator two 7.4, and enters the A2 port of the feed control valve 2 from the A port of the reversing valve body two 7.2.

[0095] The oil liquid returns to the oil tank from the A2 port of the control valve 2 through the No. 1 port and the No. 2 port of the electric proportional overflow valve 2.2. At this time, the A2 port oil pressure of the feed control valve 2 is less than the A1 port oil pressure (equal to the P port oil pressure of the reversing valve one 3) of the feed control valve 2, so the check valve 2.4 is not conducted.

[0096] 2. The constant pressure under decompression step:

[0097] It includes the A port of the oil cylinder 1 back to the oil process, at this time the reversing valve 3 is in the middle position, the B port of the oil cylinder 1 has no oil liquid into, specifically including:

[0098] The oil liquid enters the A1 port of the feed control valve 2 from the A port of the oil cylinder 1, and then enters the P port of the reversing valve two 7;

[0099] The oil liquid enters the left position of the reversing valve body two 7.2 from the P port of the reversing valve two 7, the No. 1 port and the No. 2 port of the pressure compensator two 7.4, and then enters the A port of the reversing valve body two 7.2, and then enters the A2 port of the feed control valve 2;

[0100] The oil liquid enters the No. 1 port and the No. 2 port of the electric proportional overflow valve 2.2 from the A2 port of the control valve 2, and then returns to the oil tank.

[0101] 3, the step of constant speed under pressure:

[0102] It includes the B port of the oil cylinder 1 oil process and the A port of the oil cylinder 1 back to the oil process.

[0103] Among them, the B port of the oil cylinder 1 oil process: the oil liquid enters the P port of the reversing valve one 3 from the P port of the variable pump 5, and then enters the left position of the reversing valve body one 3.3 from the No. 1 port and the No. 2 port of the pressure compensator one 3.4, and then enters the B port of the reversing valve body one 3.3, and then enters the B port of the feed control valve 2;

[0104] The oil liquid enters the B1 port of the control valve 2 from the B port of the feed control valve 2, and then enters the B port of the oil cylinder 1;

[0105] The A port of the oil cylinder 1 back to the oil process: the oil liquid enters the A1 port of the feed control valve 2 from the A port of the oil cylinder 1, and then enters the P port of the reversing valve two 7;

[0106] The oil liquid enters the right position of the reversing valve body two 7.2 from the P port of the reversing valve two 7, the No. 1 port and the No. 2 port of the pressure compensator two 7.4, and then enters the B port of the reversing valve body two 7.2, and then returns to the oil tank.

[0107] 4, the step of constant speed under pressure:

[0108] It includes the A port of the oil cylinder 1 back to the oil process, at this time the reversing valve 3 is in the middle position, the B port of the oil cylinder 1 has no oil liquid into, specifically including:

[0109] The oil liquid enters the A1 port of the feed control valve 2 from the A port of the oil cylinder 1, and then enters the P port of the reversing valve two 7;

[0110] The oil liquid enters the right position of the reversing valve body two 7.2 from the P port of the reversing valve two 7, the No. 1 port and the No. 2 port of the pressure compensator two 7.4, and then enters the B port of the reversing valve body two 7.2, and then returns to the oil tank.

[0111] AsFigure 2 The controller (5) is responsible for numerical calculation and logic control.

[0112] The proportional solenoid 13 controls Figure 1 The proportional solenoid 13 belongs to the electric proportional pressure reducing valve 3.2.

[0113] The relationship between the proportional solenoid and the corresponding valve body is the same as described above.

[0114] The proportional solenoid 14 controls Figure 1 The proportional solenoid 14 belongs to the electric proportional pressure reducing valve 3.1.

[0115] The proportional solenoid 15 controls Figure 1 The proportional solenoid 15 belongs to the electric proportional pressure reducing valve 3.1.

[0116] The proportional solenoid 16 controls Figure 1 The proportional solenoid 16 belongs to the electric proportional pressure reducing valve 3.2.

[0117] The proportional solenoid 17 controls Figure 1 The proportional solenoid 17 belongs to the electric proportional pilot relief valve 4.1.

[0118] The proportional solenoid 18 controls Figure 1 The proportional solenoid 18 belongs to the electric proportional relief valve 2.2.

[0119] The electric proportional input handle 19 controls the directional valve 3 through the 10th and 11th pins of the controller 12. When the output voltage value of the electric proportional input handle 19 is less than the middle value, the 10th pin of the controller 12 outputs a control signal to control the electric proportional pressure reducing valve 3.2. When the output voltage value of the electric proportional input handle 19 is greater than the middle value, the 11th pin of the controller 12 outputs a control signal to control the electric proportional pressure reducing valve 3.1.

[0120] The electric proportional input handle 20 controls the directional valve 7 through the 12th and 13th pins of the controller 12. When the output voltage value of the electric proportional input handle 20 is less than the middle value, the 12th pin of the controller 12 outputs a control signal to control the electric proportional pressure reducing valve 3.1. When the output voltage value of the electric proportional input handle 20 is greater than the middle value, the 14th pin of the controller 12 outputs a control signal to control the electric proportional pressure reducing valve 3.2.

[0121] The electric proportional knob 21 is used to set the drilling pressure when drilling at constant pressure, and the electric proportional knob 22 is used to set the drilling speed when drilling at constant speed.

[0122] Figure 2 The electric proportional input handle 19 controls the pressurized drilling in one direction and the slow lifting in the other direction. Among them, "lowering" refers to the retraction of the cylinder rod.

[0123] Electric proportional input handle two 20 controls constant speed drilling in one direction and constant pressure drilling in another direction.

[0124] During drilling, the controller receives the values of the encoder 10, pressure sensor two 8, pressure sensor three 9 and pressure sensor one 6, calculates the speed and lifting force of the main push cylinder (cylinder 1), and the maximum drilling pressure when the drill bit stops due to resistance.

[0125] Constant pressure implementation method: compare the calculated lifting force during drilling with the lifting force when the drilling tool is suspended, obtain the drill bit pressure, i.e. real-time drilling pressure, compare the real-time drilling pressure with the set drilling pressure value, obtain the deviation, convert the deviation value into the electric proportional relief valve 2.2 adjustment current value of the control cylinder rodless cavity pressure, control the drilling pressure around the set value by adjusting the control current of the electric proportional relief valve 2.2, and achieve constant pressure.

[0126] Constant speed implementation method: convert the cylinder piston movement speed encoder signal during drilling into drilling speed value, compare with the set drilling speed, convert the speed deviation into the electric current deviation of the pilot electric proportional pressure reducing valve three 7.1 or the pilot electric proportional pressure reducing valve four 7.2, and achieve constant speed by adjusting the electric current value of the pilot electric proportional pressure reducing valve three 7.1 or the pilot electric proportional pressure reducing valve four 7.2 to keep the drilling speed around the set value.

[0127] Among them, the encoder 10 is used to measure the stroke, and the controller 5 obtains the running speed of the cylinder 1.

[0128] In the pressurized working condition, the controller outputs control parameters according to the input values of the electric proportional knob one 21 and the electric proportional knob two 22, controls the drilling machine to drill at constant speed or constant pressure.

[0129] In the decompression working condition, the drilling does not need to occupy the pump power, and relies on the load to provide power, and constant speed drilling and constant pressure drilling can be achieved by controlling the electric proportional input handle two 20.

[0130] The above is only the preferred embodiment of the present application, and does not limit the present application in any way. Any person skilled in the art can make any form of equivalent replacement, modification or change to the technical solutions and technical contents disclosed in the present application without departing from the scope of the technical solutions of the present application, which still belongs to the protection scope of the present application.

Claims

1. A hydraulic rig drilling control system, characterized by, The application relates to a hydraulic system for a variable displacement pump (5) and a hydraulic cylinder (1), comprising: a variable displacement pump (5); a feed control valve (2) comprising a one-way valve I (2.1), a one-way valve II (2.4), a one-way valve III (2.5), an electric proportional overflow valve I (2.2) and a hydraulic control one-way valve (2.3); wherein the oil inlet of the one-way valve III (2.5) is connected with the A port of the feed control valve (2), the oil outlet is connected with the A2 port and the M port of the feed control valve (2), the oil inlet of the one-way valve II (2.4) and the oil inlet of the electric proportional overflow valve I (2.2); the oil outlet of the one-way valve II (2.4) is connected with the A1 port of the feed control valve (2); the oil outlet of the electric proportional overflow valve I (2.2) is connected with an oil tank; the oil inlet of the one-way valve I (2.1) is connected with the S port of the feed control valve (2), the oil outlet is connected with the B1 port of the feed control valve (2); the oil inlet of the hydraulic control one-way valve (2.3) is connected with the B port of the feed control valve (2), the oil outlet is connected with the B1 port of the feed control valve (2); a reversing valve I (3) and a reversing valve II (7), the reversing valve I (3) comprises a pilot electric proportional pressure reducing valve I (3.1), a pilot electric proportional pressure reducing valve II (3.2) and a reversing valve body I (3.3), the a port of the reversing valve body I (3.3) is connected with the No.2 port of the pilot electric proportional pressure reducing valve II (3.2), the b port of the reversing valve body I (3.3) is connected with the No.2 port of the pilot electric proportional pressure reducing valve I (3.1); the reversing valve II (7) comprises a pilot electric proportional pressure reducing valve III (7.1), a pilot electric proportional pressure reducing valve IV (7.2) and a reversing valve body II (7.3), the a port of the reversing valve body II (7.3) is connected with the No.2 port of the pilot electric proportional pressure reducing valve III (7.1), the b port of the reversing valve body II (7.3) is connected with the No.2 port of the pilot electric proportional pressure reducing valve IV (7.2); wherein the P port of the reversing valve I (3) is connected with the P port of the variable displacement pump (5), the LS port of the reversing valve I (3) is connected with the LS port of the variable displacement pump (5); the A port of the reversing valve I (3) is connected with the A port of the feed control valve (2), the B port of the reversing valve I (3) is connected with the B port of the feed control valve (2); the A1 port of the feed control valve (2) is connected with the A port of the hydraulic cylinder (1), the B1 port is connected with the B port of the hydraulic cylinder (1), the A2 port is connected with the A port of the reversing valve II (7), the S port and the T port are both connected with an oil tank, and the M port is connected with a pressure sensor I (6); the P port of the reversing valve II (7) is connected with the A1 port of the feed control valve (2), the T port is connected with an oil tank, a pressure sensor II (8) is connected with the B port of the hydraulic cylinder (1), and a pressure sensor III (9) is connected with the A port of the hydraulic cylinder (1); an encoder (10) is arranged on the piston rod of the hydraulic cylinder (1) and is located outside the hydraulic cylinder (1); under the pressurized constant pressure working condition, the B port of the hydraulic cylinder (1) is supplied with oil, the A port is returned with oil, the pilot electric proportional pressure reducing valve I (3.1) and the pilot electric proportional pressure reducing valve III (7.1) are powered, the left position of the reversing valve body I (3.3) is connected with the feed control valve (2), and the left position of the reversing valve body II (7.3) is connected with the electric proportional overflow valve I (2.2) of the feed control valve (2). Under the condition of constant pressure with pressure reduction, the reversing valve one (3) is in the middle position, the A port of the oil cylinder (1) returns oil, the pilot electric proportional pressure reducing valve three (7.1) is powered, the left position of the reversing valve body two (7.3) is connected with the electric proportional overflow valve one (2.2) of the feeding control valve (2); Under the condition of constant speed with pressure increase, the B port of the oil cylinder (1) enters oil, the A port returns oil, the pilot electric proportional pressure reducing valve one (3.1) and the pilot electric proportional pressure reducing valve four (7.2) are powered, the left position of the reversing valve body one (3.3) is connected with the feeding control valve (2), and the right position of the reversing valve body two (7.3) is connected with the oil tank; Under the condition of constant speed with pressure reduction, the reversing valve one (3) is in the middle position, the A port of the oil cylinder (1) returns oil, the pilot electric proportional pressure reducing valve four (7.2) is powered, and the right position of the reversing valve body two (7.3) is connected with the oil tank.

2. The hydraulic rig drilling control system of claim 1, wherein, Further comprising: The pressure compensator one (3.4) is connected with the P port of the reversing valve one (3), and the oil outlet thereof is connected with the left position of the reversing valve body one (3.3) under the conditions of constant pressure with pressure increase and constant speed with pressure increase.

3. The hydraulic rig drilling control system of claim 1, wherein, Further comprising: The pressure compensator two (7.4) is connected with the P port of the reversing valve two (7), and the oil outlet thereof is connected with the left position of the reversing valve body two (7.3) under the conditions of constant pressure with pressure increase and constant pressure with pressure reduction, and the oil outlet thereof is connected with the right position of the reversing valve body two (7.3) under the conditions of constant speed with pressure increase and constant speed with pressure reduction.

4. The hydraulic rig drilling control system of claim 1, wherein, Further comprising: The electric proportional overflow valve two (4) is connected with the MSB port of the reversing valve one (3).

5. A method of hydraulic drill rig drilling control, characterized in that, The method comprises the following steps: The steps of constant pressure with pressure increase and constant pressure with pressure reduction; The step of constant pressure with pressure increase comprises the process that the B port of the oil cylinder (1) enters oil and the process that the A port of the oil cylinder (1) returns oil; The process that the B port of the oil cylinder (1) enters oil: the oil enters the P port of the reversing valve one (3) from the P port of the variable pump (5), enters the left position of the reversing valve body one (3.3) through the first port and the second port of the pressure compensator one (3.4), and enters the B port of the feeding control valve (2) through the B port of the reversing valve body one (3.3); The oil enters the B port of the oil cylinder (1) from the B1 port of the feeding control valve (2) through the hydraulic control check valve (2.3); The process that the A port of the oil cylinder (1) returns oil: the oil enters the A1 port of the feeding control valve (2) from the A port of the oil cylinder (1), and then enters the P port of the reversing valve two (7); The oil enters the left position of the reversing valve body two (7.3) through the first port and the second port of the pressure compensator two (7.4) from the P port of the reversing valve two (7), and enters the A2 port of the feeding control valve (2) through the A port of the reversing valve body two (7.3); The oil returns to the oil tank through the A2 port of the feeding control valve (2) and the first port and the second port of the electric proportional overflow valve one (2.2); The step of constant pressure with pressure reduction comprises the process that the A port of the oil cylinder (1) returns oil, and the reversing valve one (3) is in the middle position, and the B port of the oil cylinder (1) does not enter oil, and the process comprises: The oil enters the A1 port of the feeding control valve (2) from the A port of the oil cylinder (1), and then enters the P port of the reversing valve two (7); The oil liquid from the P port of the reversing valve two (7) enters the left position of the reversing valve body two (7.3) through the 1# and 2# ports of the pressure compensator two (7.4), enters the A2 port of the feeding control valve (2) through the A port of the reversing valve body two (7.3); The oil liquid from the A2 port of the control valve (2) returns to the oil tank through the 1# and 2# ports of the electric proportional overflow valve one (2.2).

6. The method of hydraulic rig drilling control according to claim 5, wherein, The method comprises the following steps: The step of constant speed under pressure, which comprises the B port oil inlet process of the oil cylinder (1) and the A port oil return process of the oil cylinder (1); The B port oil inlet process of the oil cylinder (1): the oil liquid from the P port of the variable pump (5) enters the P port of the reversing valve one (3), and the oil liquid enters the left position of the reversing valve body one (3.3) through the 1# and 2# ports of the pressure compensator one (3.4), and enters the B port of the feeding control valve (2) through the B port of the reversing valve body one (3.3); The oil liquid from the B port of the feeding control valve (2) enters the B port of the oil cylinder (1) through the hydraulic control check valve (2.3); The A port oil return process of the oil cylinder (1): the oil liquid from the A port of the oil cylinder (1) enters the A1 port of the feeding control valve (2), and then enters the P port of the reversing valve two (7); The oil liquid from the P port of the reversing valve two (7) enters the right position of the reversing valve body two (7.3) through the 1# and 2# ports of the pressure compensator two (7.4), and returns to the oil tank through the B port of the reversing valve body two (7.3).

7. The method of hydraulic rig drilling control of claim 5, wherein, The method comprises the following steps: The step of constant speed under pressure, which comprises the B port oil inlet process of the oil cylinder (1) and the A port oil return process of the oil cylinder (1); The A port oil return process of the oil cylinder (1): the oil liquid from the A port of the oil cylinder (1) enters the A1 port of the feeding control valve (2), and then enters the P port of the reversing valve two (7); The oil liquid from the P port of the reversing valve two (7) enters the right position of the reversing valve body two (7.3) through the 1# and 2# ports of the pressure compensator two (7.4), and returns to the oil tank through the B port of the reversing valve body two (7.3).

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