Automatic control system for lifting and placing a base of a drilling tower of a petroleum drilling rig

Abstract

The application discloses a kind of petroleum drilling rig derrick base automatic lifting and placing control system, including a kind of petroleum drilling rig derrick base automatic lifting and placing control system, including control operation box, first hydraulic winch, second hydraulic winch, first safety tongs, second safety tongs, first displacement sensor, second displacement sensor, first buffer hydraulic cylinder, second buffer hydraulic cylinder and control unit;The control operation box is equipped with oil inlet, oil return and oil drain, and the oil inlet is respectively connected with the oil inlet of first throttle valve and multiway valve;The present application uses electric proportional multiway valve to control two groups of hydraulic winch to lift and place, uses high-precision synchronous motor to ensure the synchronism of lifting and placing process, when out of sync, automatically fine-tuning is carried out through fine-tuning association, and the degree of automation is high, and the synchronization performance is good;The system can not only realize well derrick base synchronous lifting and placing, but also can realize individual action, two hydraulic winches are not affected when individual action, satisfy different lifting and placing conditions, and are widely applied.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil drilling rigs, in particular to an automatic lifting and placing control system for the derrick base of an oil drilling rig. BACKGROUND

[0002] Traditional lifting and placing of the derrick base of an oil drilling rig is mainly achieved by using a drilling winch. With the continuous development of oil drilling rig technology, especially the increasing demand for automatic drilling rigs, the lifting and placing of the derrick base of a drilling rig by using a hydraulic winch and a hydraulic cylinder is increasingly widespread, especially in situations where the structure is limited, the safety requirement of drilling equipment is high, and rapid relocation is to be achieved. However, when the hydraulic winch is used to lift and place the derrick base of a drilling rig, the winch is driven by a single motor, and no additional braking measures are provided except for a balance valve and a brake. Although a synchronous handle is provided, the synchronization is achieved by using a shunt valve and relying on the naked eye observation of the lifting deviation and then adjusting the handle for fine adjustment control. This method has the problems of complex operation, poor synchronization effect, pipe burst, stall, low safety factor, and the like, which can easily lead to safety accidents such as tearing and falling of the derrick or the base, and cannot meet the requirements of automatic lifting and placing of the derrick base of an oil drilling rig. SUMMARY

[0003] The present application aims to provide an automatic lifting and placing control system for the derrick base of an oil drilling rig to solve the problems presented in the background.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solution: an automatic lifting and placing control system for the derrick base of an oil drilling rig, comprising a control operation box, a first hydraulic winch, a second hydraulic winch, a first safety clamp, a second safety clamp, a first displacement sensor, a second displacement sensor, a first buffer hydraulic cylinder, a second buffer hydraulic cylinder, and a control unit. An oil inlet, an oil return, and an oil drain are provided on the control operation box, and the oil inlet is connected to the oil inlet of a first throttle valve and a multi-way valve.

[0005] The multi-way valve comprises a first joint multi-way valve, a second joint multi-way valve, a third joint multi-way valve, a fourth joint multi-way valve, and a fifth joint multi-way valve. The first joint multi-way valve controls the first buffer hydraulic cylinder, and the second joint multi-way valve controls the second buffer hydraulic cylinder. A first hydraulic control reversing valve and a first buffer valve are sequentially arranged between the rodless cavity of the first buffer hydraulic cylinder and the oil return, and the control port pressure oil of the first hydraulic control reversing valve comes from the X port of the first joint multi-way valve. A second hydraulic control reversing valve and a second buffer valve are sequentially arranged between the rodless cavity of the second buffer hydraulic cylinder and the oil return, and the control port pressure oil of the second hydraulic control reversing valve comes from the X port of the second joint multi-way valve. A fourth one-way valve is arranged between the rod cavity of the first buffer hydraulic cylinder and the oil return, and a third one-way valve is arranged between the rod cavity of the second buffer hydraulic cylinder and the oil return.

[0006] The A and B ports of the third multi-way valve are connected to the lowering port and the lifting port of the first hydraulic winch respectively through the first hydraulic-controlled ball valve and the second hydraulic-controlled ball valve, and the A and B ports of the fourth multi-way valve are connected to the lowering port and the lifting port of the second hydraulic winch respectively through the third hydraulic-controlled ball valve and the fourth hydraulic-controlled ball valve; the A port of the fifth multi-way valve is connected to the lowering port of the first hydraulic winch through the first hydraulic-controlled one-way valve and the lowering port of the second hydraulic winch through the second hydraulic-controlled one-way valve; the B port of the fifth multi-way valve is connected to the synchronous motor through the first one-way throttle valve and the third hydraulic-controlled one-way valve, and the outlets of the synchronous motor are connected to the lifting ports of the first hydraulic winch and the second hydraulic winch respectively;

[0007] The synchronous motor includes two hydraulic motors, two one-way valves and two overflow valves, wherein the one-way valve and the overflow valve are arranged between the outlets of the two hydraulic motors, and the outlets of the two overflow valves are connected to the inlets of the two one-way valves and communicate with the oil return port.

[0008] Preferably, the control oil of the first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve comes from the B port of the fifth multi-way valve, and the control oil of the third hydraulically controlled one-way valve comes from the A port of the fifth multi-way valve; the spring chamber control oil of the first hydraulically controlled ball valve and the second hydraulically controlled ball valve comes from the X port of the third multi-way valve, and the spring chamber control oil of the third hydraulically controlled ball valve and the fourth hydraulically controlled ball valve comes from the X port of the fourth multi-way valve; the control chambers of the first hydraulically controlled ball valve, the second hydraulically controlled ball valve, the third hydraulically controlled ball valve and the fourth hydraulically controlled ball valve are connected to the X port of the fifth multi-way valve.

[0009] Preferably, the first safety clamp and the second safety clamp are respectively communicated with the oil inlet of the operation box through the first hydraulic control valve and the second hydraulic control valve through the first pressure reducing valve and the first throttle valve. The first and second one-way valves are respectively provided on the bypass of the working oil ports of the first and second safety clamps. The outlets of the first and second one-way valves are communicated. The outlets of the first and second one-way valves are divided into two routes: one route is connected to the Y port of the multi-way valve through the second throttle valve, and the other route is communicated with the oil drain route through the electromagnetic ball valve; the control oil of the first hydraulic control valve is taken from the X port of the fourth multi-way valve and the X port of the fifth multi-way valve through the first shuttle valve, and the control oil of the second hydraulic control valve is taken from the X port of the third multi-way valve and the X port of the fifth multi-way valve through the second shuttle valve.

[0010] Preferably, the first hydraulic winch includes a motor and a rib valve, the first hydraulic winch's lifting and lowering port and lower port are both provided with stop valves, a buffer overflow valve is provided between the first hydraulic winch's lifting and lowering port and lower port, the lifting port is provided with a balance valve, and the opening and closing of the balance valve is controlled by the pressure of the lower port; the two oil inlets of the shuttle valve are respectively connected to the motor's lifting and lowering port, and the shuttle valve outlet is connected to the brake through the second pressure reducing valve, the hydraulic valve, and the second one-way throttle valve to control the action of the brake; the second hydraulic winch has exactly the same structure as the first hydraulic winch and is arranged symmetrically on the left and right.

[0011] Preferably, the first displacement sensor and the second displacement sensor are used to detect the lifting and landing state of the base, and transmit the detection data to the control unit in the control box in real time, and through the PLC control in the control unit, the lifting and landing state of the derrick base is detected and automatically adjusted in real time.

[0012] The working principle of the present application is as follows:

[0013] The automatic lifting and landing control system of the derrick base of the petroleum drilling rig comprises a synchronous lifting system, a buffer system and a brake system, the synchronous lifting system and the buffer system are controlled by an electric proportional multi-way valve, wherein a first multi-way valve and a second multi-way valve control a first buffer hydraulic cylinder and a second buffer hydraulic cylinder respectively, a hydraulic control reversing valve and a buffer valve are sequentially arranged between the rodless cavity of the buffer hydraulic cylinder and the oil return, and a one-way valve is arranged between the rod cavity of the buffer hydraulic cylinder and the oil return; a third multi-way valve, a fourth multi-way valve and a fifth multi-way valve control synchronous lifting and landing, wherein the fifth multi-way valve is a synchronous connection, the A port is connected with the lowering ports of left and right hydraulic winches respectively, the B port is connected with the lifting ports of left and right hydraulic winches through a synchronous motor respectively, the third multi-way valve and the fourth multi-way valve are fine adjustment connections, and the lifting ports and the lowering ports of left and right hydraulic winches are communicated through a hydraulic control ball valve, so that fine adjustment is performed when displacement deviation of the corresponding actuator occurs; the brake system comprises left and right safety clamps, the first safety clamp and the second safety clamp are communicated with the oil inlet of the operation box through a first hydraulic control valve and a second hydraulic control valve, a first pressure reducing valve and a first throttling valve, first-way valves and second-way valves are arranged on the bypasses of the working oil outlets of the first safety clamp and the second safety clamp respectively, one-way valve outlets are connected with the Y port of the multi-way valve through a second throttling valve and communicated with a drain line through an electromagnetic ball valve, and the first safety clamp and the second safety clamp play a secondary safety protection role on the safety of the lifting and landing of the derrick base. The present application realizes full-automatic lifting of the derrick base, realizes left and right independent fine adjustment, and realizes multiple protection of lifting and landing safety, and has the functions of high automation degree, good synchronism and safety and reliability.

[0014] The present application has the following advantages:

[0015] The automatic lifting and placing control system of the petroleum drilling rig derrick base of the present application adopts the electric proportional multi-way valve to control two groups of hydraulic winches to lift and place, adopts the high-precision synchronous motor to ensure the synchronization of the lifting and placing process, and automatically fine tunes through the fine tuning joint when the synchronization is not achieved, so that the system has high automation degree and good synchronization performance; the system can not only realize the synchronous lifting and placing of the derrick base, but also realize the individual action, and the two hydraulic winches do not affect each other when the individual action is realized, so that the system meets different lifting and placing conditions and has wide application; the hydraulic winch motor is provided with the brake, the brake oil is taken from the motor working oil port, and the system is safe and reliable; meanwhile, the safety clamp is also arranged on the winch drum to ensure the safety of the lifting and placing, the control oil of the safety clamp does not affect the control oil of the hydraulic motor brake, in addition, the electromagnetic ball valve is arranged on the control oil way of the safety clamp, and when the derrick base cannot be braked due to the fault, the emergency brake can be realized by losing the power of the electromagnetic ball valve through the emergency stop control, so that the safe multiple protection is realized; each group of hydraulic winches adopts four motors, two of which are used as the standby, so that the reliability of the product is improved; in addition, the lifting and placing system is also provided with the emergency brake function to ensure the safety and reliability in the lifting and placing process. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the principle diagram of the automatic lifting and placing control system of the petroleum drilling rig derrick base of the present application;

[0017] Fig. 2 It is the principle diagram of the motor assembly;

[0018] Figure: 2, first hydraulic winch, 3, second hydraulic winch, 10, first joint multi-way valve X port, 11, oil inlet, 12, oil return port, 13, oil drain port, 20, second joint multi-way valve X port, 21, first safety clamp, 22, second safety clamp, 30, third joint multi-way valve X port, 40, fourth joint multi-way valve X port, 50, fifth joint multi-way valve X port, 60, multi-way valve Y port, 100, control operation box, 101, first pressure reducing valve, 102, second throttle valve, 103, electromagnetic ball valve, 104, first hydraulic control valve, 105, second hydraulic control valve, 106, first check valve, 107, second check valve, 108, first throttle valve, 109, second shuttle valve, 110, multi-way valve, 111, first joint multi-way valve, 112, second joint multi-way valve, 113, third joint multi-way valve, 114, fourth joint multi-way valve, 115, fifth joint multi-way valve, 116, first shuttle valve, 121, third hydraulic control check valve, 122, second hydraulic control check valve, 123, fourth hydraulic control ball valve, 124, third hydraulic control ball valve, 125, second hydraulic control ball valve, 126, first hydraulic control ball valve, 127, first hydraulic control check valve, 128, first check throttle valve, 130, synchronous motor, 131, hydraulic motor, 132, check valve, 133, overflow valve, 140, first buffer valve, 141, first hydraulic control reversing valve, 142, second buffer valve, 143, second hydraulic control reversing valve, 144, first buffer hydraulic cylinder, 145, second buffer hydraulic cylinder, 146, third check valve, 147, fourth check valve, 150, control unit, 201, motor, 202, brake, 203, second check throttle valve, 204, stop valve, 205, hydraulic valve, 206, second pressure reducing valve, 207, shuttle valve, 208, buffer overflow valve, 209, balance valve, 211, first displacement sensor, 212, second displacement sensor. DETAILED DESCRIPTION

[0019] The application will be further described in detail below with reference to the accompanying drawings.

[0020] As Figs. 1-2The automatic lifting and placing control system of the oil drilling rig derrick base includes a control operation box 100, a first hydraulic winch 2, a second hydraulic winch 3, a first safety clamp 21, a second safety clamp 22, a first displacement sensor 211, a second displacement sensor 212, a first buffer hydraulic cylinder 144, a second buffer hydraulic cylinder 145, and a control unit 150; the control operation box 100 is provided with an oil inlet 11, an oil return port 12, and a drain port 13, and the oil inlet 11 is connected with the oil inlet of a first throttle valve 108 and a multi-way valve 110; the multi-way valve 110 includes a first joint multi-way valve 111, a second joint multi-way valve 112, a third joint multi-way valve 113, a fourth joint multi-way valve 114, and a fifth joint multi-way valve 115; the first joint multi-way valve 111 controls the first buffer hydraulic cylinder 144, and the second joint multi-way valve 112 controls the second buffer hydraulic cylinder 145; the first buffer hydraulic cylinder 144 is sequentially provided with a first buffer valve 140 and a first hydraulic control reversing valve 141 between the rodless cavity and the oil return port 12, and the control port pressure oil of the first hydraulic control reversing valve 141 comes from the first joint multi-way valve X port 10; the second buffer hydraulic cylinder 145 is sequentially provided with a second buffer valve 142 and a second hydraulic control reversing valve 143 between the rodless cavity and the oil return port 12, and the control port pressure oil of the second hydraulic control reversing valve 143 comes from the second joint multi-way valve X port 20; the fourth one-way valve 147 is arranged between the rod cavity of the first buffer hydraulic cylinder 144 and the oil return port, and the third one-way valve 146 is arranged between the rod cavity of the second buffer hydraulic cylinder 145 and the oil return port; the A and B ports of the third joint multi-way valve 113 are respectively connected with the lowering port and the lifting port of the first hydraulic winch 2 through a first hydraulic control ball valve 126 and a second hydraulic control ball valve 125, and the A and B ports of the fourth joint multi-way valve 114 are respectively connected with the lowering port and the lifting port of the second hydraulic winch 3 through a third hydraulic control ball valve 124 and a fourth hydraulic control ball valve 123; the A port of the fifth joint multi-way valve 115 is connected with the lowering port of the first hydraulic winch 2 through a first hydraulic control one-way valve 127 and with the lowering port of the second hydraulic winch 3 through a second hydraulic control one-way valve 122; the B port of the fifth joint multi-way valve 115 is connected with a synchronous motor 130 through a first one-way throttle valve 128 and a third hydraulic control one-way valve 121, and the outlet of the synchronous motor 130 is respectively connected with the lifting port of the first hydraulic winch 2 and the lifting port of the second hydraulic winch 3; the synchronous motor 130 includes two hydraulic motors 131, two one-way valves 132, and two overflow valves 133, wherein the one-way valve 132 and the overflow valve 133 are arranged between the outlets of the two hydraulic motors 131, and the outlets of the two overflow valves 133 are connected with the inlets of the two one-way valves 132 and communicated with the oil return port 12.

[0021] The control oil of the first hydraulically controlled one-way valve 127 and the second hydraulically controlled one-way valve 122 comes from the B port of the fifth multi-way valve 115, and the control oil of the third hydraulically controlled one-way valve 121 comes from the A port of the fifth multi-way valve 115; the control oil of the spring chamber of the first hydraulically controlled ball valve 126 and the second hydraulically controlled ball valve 125 comes from the X port 30 of the third multi-way valve, and the control oil of the spring chamber of the third hydraulically controlled ball valve 124 and the fourth hydraulically controlled ball valve 123 comes from the X port 40 of the fourth multi-way valve; the control chambers of the first hydraulically controlled ball valve 126, the second hydraulically controlled ball valve 125, the third hydraulically controlled ball valve 124 and the fourth hydraulically controlled ball valve 123 are connected to the X port 50 of the fifth multi-way valve. The first and second safety clamps 21 and 22 are connected to the operating box oil inlet 11 via the first and second hydraulically controlled valves 104 and 105, respectively, via the first reducing valve 101 and the first throttle valve 108. A first and second one-way valves 106 and 107 are respectively provided on the bypass paths of the working oil ports of the first and second safety clamps 21 and 22. The outlets of the first and second one-way valves 106 and 107 are connected. The outlets of the first and second one-way valves 106 and 107 are divided into two routes: one route is connected to the multi-way valve Y port 60 via the second throttle valve 102, and the other route is connected to the oil drain line 13 via the electromagnetic ball valve 103. The control oil of the first hydraulically controlled valve 104 is taken from the fourth and fifth multi-way valve X ports 40 and 50 via the first shuttle valve 116. The control oil of the second hydraulically controlled valve 105 is taken from the third and fifth multi-way valve X ports 40 and 50 via the second shuttle valve 109.

[0022] The first hydraulic winch 2 includes a motor 201 and a shuttle valve 207. The lifting and lowering ports and the lower port of the first hydraulic winch 2 are both provided with a stop valve 204. A buffer overflow valve 208 is provided between the lifting and lowering ports of the first hydraulic winch 2. The lifting port is provided with a balance valve 209. The opening and closing of the balance valve 209 is controlled by the pressure of the lower port; the two oil inlets of the shuttle valve 207 are respectively connected to the lifting and lowering ports of the motor 201, and the outlet of the shuttle valve 207 is connected to the brake 202 through the second pressure reducing valve 206, the hydraulic valve 205, and the second one-way throttle valve 203 and controls the action of the brake 202; the second hydraulic winch 3 has the same structure as the first hydraulic winch 2 and is arranged symmetrically on the left and right.

[0023] The first displacement sensor 211 and the second displacement sensor 212 are used to detect the lifting and lowering status of the base and transmit the detection data to the control unit 150 in the control box in real time. Through the PLC control in the control unit 150, the lifting and lowering status of the derrick base is detected and automatically adjusted in real time.

[0024] The working principle of the present invention is:

[0025] The automatic lifting and placing control system of the oil drilling rig derrick base comprises a synchronous lifting system, a buffer system and a brake system, the synchronous lifting system and the buffer system are controlled by an electric proportional multi-way valve, wherein a first multi-way valve 111 and a second multi-way valve 112 control a first buffer hydraulic cylinder 144 and a second buffer hydraulic cylinder 145 respectively, a hydraulic control reversing valve and a buffer valve are sequentially arranged between the rodless cavity of the buffer hydraulic cylinder and the oil return, and a one-way valve is arranged between the rod cavity of the buffer hydraulic cylinder and the oil return; a third multi-way valve 113, a fourth multi-way valve 114 and a fifth multi-way valve 115 control synchronous lifting and placing, wherein the fifth multi-way valve 115 is a synchronous connection, the A port is connected with the lowering ports of left and right hydraulic winches respectively, the B port is connected with the lifting ports of left and right hydraulic winches through a synchronous motor respectively, the third multi-way valve 113 and the fourth multi-way valve 114 are fine adjustment connections, and the lifting ports and the lowering ports of left and right hydraulic winches are communicated through a hydraulic control ball valve, so that fine adjustment is performed when displacement deviation of the corresponding actuator occurs; the brake system comprises left and right safety clamps, a first safety clamp 21 and a second safety clamp 22 are communicated with the oil inlet 11 of the operation box through a first hydraulic control valve 104 and a second hydraulic control valve 105, a first pressure reducing valve 101 and a first throttle valve 108, a first one-way valve 106 and a second one-way valve 107 are arranged on the bypass of the working oil ports of the first safety clamp 21 and the second safety clamp 22 respectively, one-way valve outlets are connected with the Y port of the multi-way valve through a second throttle valve 102 and communicated with a drain line 13 through an electromagnetic ball valve 103, and the safety of the lifting and placing of the derrick base is protected twice. The present application realizes full-automatic lifting of the derrick base, left and right independent fine adjustment and multiple protection of lifting and placing safety, and has the functions of high automation, good synchronization and safety and reliability.

[0026] The above is only the preferred embodiment of the present application. It should be noted that for those skilled in the art, under the technical inspiration provided by the present application, as the common knowledge in the electrical field, other equivalent modifications and improvements can also be made, which should also be considered as the protection scope of the present application.

Claims

1. An automatic raising and lowering control system for a petroleum drilling rig derrick base, characterized by: The invention comprises a control operation box (100), a first hydraulic winch (2), a second hydraulic winch (3), a first safety clamp (21), a second safety clamp (22), a first displacement sensor (211), a second displacement sensor (212), a first buffer hydraulic cylinder (144), a second buffer hydraulic cylinder (145) and a control unit (150); the control operation box (100) is provided with an oil inlet (11), an oil return port (12) and an oil drain port (13); the oil inlet (11) is connected to the oil inlets of the first throttle valve (108) and the multi-way valve (110), respectively; The multi-way valve (110) comprises a first multi-way valve (111), a second multi-way valve (112), a third multi-way valve (113), a fourth multi-way valve (114) and a fifth multi-way valve (115); the first multi-way valve (111) controls the first buffer hydraulic cylinder (144), and the second multi-way valve (112) controls the second buffer hydraulic cylinder (145); a first hydraulically controlled reversing valve (141), a first buffer valve (140), a first hydraulically controlled reversing valve (141), a first buffer valve (140), a first hydraulically controlled reversing valve (141), a first hydraulically controlled reversing ... The control port pressure oil of the valve (141) comes from the X port (10) of the first multi-way valve; a second hydraulically controlled reversing valve (143) and a second buffer valve (142) are sequentially arranged between the rodless portion and the oil return port (12) of the second buffer hydraulic cylinder (145); the control port pressure oil of the second hydraulically controlled reversing valve (143) comes from the X port (20) of the second multi-way valve; a fourth one-way valve (147) is arranged between the rod chamber of the first buffer hydraulic cylinder (144) and the oil return port, and a third one-way valve (146) is arranged between the rod chamber of the second buffer hydraulic cylinder (145) and the oil return port. The A and B ports of the third multi-way valve (113) are connected to the lower opening and the raising and lowering ports of the first hydraulic winch (2) through the first hydraulically controlled ball valve (126) and the second hydraulically controlled ball valve (125), respectively. The A and B ports of the fourth multi-way valve (114) are connected to the lower opening and the raising and lowering ports of the second hydraulic winch (3) through the third hydraulically controlled ball valve (124) and the fourth hydraulically controlled ball valve (123), respectively. The A port of the fifth multi-way valve (115) is connected to the lower opening of the first hydraulic winch (2) through the first hydraulically controlled one-way valve (127) and to the lower opening of the second hydraulic winch (3) through the second hydraulically controlled one-way valve (122). The B port of the fifth multi-way valve (115) is connected to the synchronous motor (130) through the first one-way throttle valve (128) and the third hydraulically controlled one-way valve (121). The outlets of the synchronous motor (130) are connected to the raising and lowering ports of the first hydraulic winch (2) and the second hydraulic winch (3), respectively. The synchronous motor (130) comprises two hydraulic motors (131), two one-way valves (132) and two overflow valves (133), wherein the one-way valve (132) and the overflow valve (133) are arranged between the outlets of the two hydraulic motors (131), and the outlets of the two overflow valves (133) are connected to the inlets of the two one-way valves (132) and communicate with the oil return port (12).

2. The automatic raising and lowering control system for the oil drilling rig derrick base according to claim 1 is characterized in that: The control oil of the first hydraulically controlled one-way valve (127) and the second hydraulically controlled one-way valve (122) comes from the B port of the fifth multi-way valve (115), and the control oil of the third hydraulically controlled one-way valve (121) comes from the A port of the fifth multi-way valve (115); the control oil of the spring chambers of the first hydraulically controlled ball valve (126) and the second hydraulically controlled ball valve (125) comes from the X port (30) of the third multi-way valve, and the control oil of the spring chambers of the third hydraulically controlled ball valve (124) and the fourth hydraulically controlled ball valve (123) comes from the X port (40) of the fourth multi-way valve; the control chambers of the first hydraulically controlled ball valve (126), the second hydraulically controlled ball valve (125), the third hydraulically controlled ball valve (124), and the fourth hydraulically controlled ball valve (123) are connected to the X port (50) of the fifth multi-way valve.

3. The automatic raising and lowering control system for the oil drilling rig derrick base according to claim 2 is characterized in that: The first safety clamp (21) and the second safety clamp (22) are respectively connected to the oil inlet (11) of the operation box through the first hydraulic control valve (104) and the second hydraulic control valve (105) through the first pressure reducing valve (101) and the first throttle valve (108). The first one-way valve (106) and the second one-way valve (107) are respectively provided on the bypass of the working oil port of the first safety clamp (21) and the second safety clamp (22). The outlets of the first one-way valve (106) and the second one-way valve (107) are connected. The outlet of the second one-way valve (107) is divided into two routes: one route is connected to the multi-way valve Y port (60) through the second throttle valve (102), and the other route is connected to the oil drain port (13) through the electromagnetic ball valve (103); the control oil of the first hydraulic control valve (104) is taken from the fourth multi-way valve X port (40) and the fifth multi-way valve X port (50) through the first shuttle valve (116), and the control oil of the second hydraulic control valve (105) is taken from the third multi-way valve X port (30) and the fifth multi-way valve X port (50) through the second shuttle valve (109).

4. The automatic raising and lowering control system for the oil drilling rig mast substructure according to claim 3 is characterized in that: The first hydraulic winch (2) comprises a motor (201) and a shuttle valve (207). The lifting and lowering ports of the first hydraulic winch (2) are both provided with stop valves (204). A buffer overflow valve (208) is provided between the lifting and lowering ports of the first hydraulic winch (2). The lifting port is provided with a balance valve (209). The opening and closing of the balance valve (209) is controlled by the pressure of the lower opening. The two oil inlets of the shuttle valve (207) are respectively connected to the lifting and lowering ports of the motor (201). The outlet of the shuttle valve (207) is connected to the brake (202) through the second pressure reducing valve (206), the hydraulic valve (205), and the second one-way throttle valve (203) to control the action of the brake (202). The second hydraulic winch (3) has the same structure as the first hydraulic winch (2) and is arranged symmetrically on both sides.

5. The automatic raising and lowering control system for the oil drilling rig derrick base according to claim 4 is characterized in that: The first displacement sensor (211) and the second displacement sensor (212) are used to detect the raising and lowering status of the base, and transmit the detection data to the control unit (150) in the control box in real time. Under the control of the PLC in the control unit (150), the raising and lowering status of the derrick base is detected and automatically adjusted in real time.

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