Interlocking control system and method for hydraulic elevator and hydraulic slip

Abstract

The invention relates to an interlocking control system and method for a hydraulic elevator and a hydraulic slip, and belongs to the field of hydraulic control. The slip control unit comprises an oil outlet header pipe, an oil return header pipe, a first hand-operated direction valve, a first single-action hydraulic cylinder, a first signal oil cylinder and a slip oil cylinder, the oil outlet header pipe and the oil return header pipe are both connected with the first hand-operated direction valve, and the oil inlet end of the slip oil cylinder is connected with the first hand-operated direction valve through a first input pipeline; and the oil outlet end of the slip oil cylinder is connected with the first hand-operated direction valve through a first output pipeline. The problem of interlocking control of the hydraulic elevator and the chuck is solved, and a safe and reliable control function is realized; and the safety and maintainability of the equipment are greatly improved through the design of interlocking mistaken touch prevention, slip and elevator state signal display, equipped pressure maintenance and the like of the system, and the system is suitable for being widely applied to the oil drilling platform.

Description

Technical Field

[0001] The invention relates to an interlocking control system and method for a hydraulic elevator and a hydraulic slip, and belongs to the field of hydraulic control. Background Art

[0002] During the drilling process, power elevators and power slips (chucks) are important equipment for fixing and lifting pipes. Since elevators and slips usually need to be operated in coordination, in order to prevent accidental contact and misoperation of the equipment, which may lead to safety hazards, interlocking is usually achieved through an integrated electrical control solenoid reversing valve.

[0003] The Chinese invention patent with publication number CN118187806A discloses a power elevator and power slip safety redundant interlocking system, including a control system, the control system is electrically connected to the elevator buckle sensor, elevator load sensor and elevator opening solenoid valve installed on the elevator body, the slip closing sensor, slip load sensor and slip opening solenoid valve installed on the slip body, the control system installed inside the driller's room control cabinet, and the instrument system installed inside the instrument control cabinet. The invention solves the problem that the existing interlocking system cannot determine the correctness of the switch signal and cannot achieve safety interlocking after the sensor fails, improves the system's fault diagnosis capability for the sensor system, realizes safe operation, and achieves the purpose of safe and efficient production. However, in the prior art, due to the shortcomings of electrical flammability, explosion, and susceptibility to interference, the requirements for electrical equipment are extremely high for special working conditions such as high oil and gas concentration and salt spray, and it is difficult to adapt to complex drilling environments.

[0004] Therefore, there is a need for an interlocking control system and method for hydraulic elevators and hydraulic slips to achieve reliability in operation under complex drilling environments. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in order to overcome the deficiencies of the prior art, an interlocking control system and method for hydraulic elevators and hydraulic slips are provided to achieve operational reliability in a complex drilling environment.

[0006] The technical solution adopted by the present invention to solve the above-mentioned problem is: an interlocking control system for hydraulic elevators and hydraulic slips, including a slip control unit and an elevator control unit; The slip control unit includes an oil outlet main pipe, an oil return main pipe, a first manual reversing valve, a first single-acting hydraulic cylinder, a first signal hydraulic cylinder and a slip cylinder. The oil outlet main pipe and the oil return main pipe are both connected to the first manual reversing valve. The oil inlet end of the slip cylinder is connected to the first manual reversing valve through a first input pipe, and the oil outlet end of the slip cylinder is connected to the first manual reversing valve through a first output pipe. The first single-acting hydraulic cylinder is used to realize the reversing action of the first manual reversing valve. A first one-way throttle valve is provided on the first input pipe, and a second one-way throttle valve is provided on the first output pipe. A first connecting pipe and a second connecting pipe are connected between the first input pipe and the first output pipe. A first clamping high-pressure relief valve is provided on the first connecting pipe, and a first opening A low-pressure relief valve, the first clamping high-pressure relief valve and the first opening low-pressure relief valve are connected through a first control oil route, the first control oil route is provided with a first clamping low-pressure relief valve and a first normally open stroke valve, the oil outlet end of the first signal oil cylinder is connected to the first output pipeline through a third connecting pipe, the connection point of the third connecting pipe and the first output pipeline is located between the second one-way throttle valve and the first manual reversing valve, the oil inlet end of the first signal oil cylinder is connected to the first input pipeline through a fourth connecting pipe, the connection point of the fourth connecting pipe and the first input pipeline is located between the first one-way throttle valve and the first manual reversing valve, the fourth connecting pipe is provided with a first one-way sequence valve and a first low-pressure pressure reducing valve, the first one-way sequence valve and the first low-pressure pressure reducing valve are both connected to the return oil main pipe through a fifth connecting pipe; The elevator control unit includes an oil outlet branch, an oil return branch, a second manual reversing valve, a second single-acting hydraulic cylinder, a second signal oil cylinder and an elevator oil cylinder. The oil outlet main pipe is connected to the second manual reversing valve through the oil outlet branch, and the oil return main pipe is connected to the second manual reversing valve through the oil return branch. The connection between the oil return branch and the oil return main pipe is located between the connection between the fifth connecting pipe and the oil return main pipe and the output end of the oil return main pipe. The oil inlet end of the elevator oil cylinder is connected to the second manual reversing valve through the second input pipeline, and the oil outlet end of the elevator oil cylinder is connected to the second manual reversing valve through the second output pipeline. The second single-acting hydraulic cylinder is used to realize the reversing action of the second manual reversing valve. The second input pipeline is provided with a third one-way throttle valve, and the second output pipeline is provided with a fourth one-way throttle valve. The second input pipeline and the second output pipeline are connected with a seventh connecting pipe and an eighth connecting pipe. The seventh A second clamping high-pressure relief valve is provided on the connecting pipe, a second opening low-pressure relief valve is provided on the eighth connecting pipe, the second clamping high-pressure relief valve and the second opening low-pressure relief valve are connected through a second control oil route, a second clamping low-pressure relief valve and a second normally open stroke valve are provided on the second control oil route, the oil outlet end of the second signal oil cylinder is connected to the second output pipeline through a ninth connecting pipe, the connection point of the ninth connecting pipe and the second output pipeline is located between the fourth one-way throttle valve and the second manual reversing valve, the oil inlet end of the second signal oil cylinder is connected to the second input pipeline through a tenth connecting pipe, the connection point of the tenth connecting pipe and the second input pipeline is located between the third one-way throttle valve and the second manual reversing valve, the tenth connecting pipe is provided with a second one-way sequence valve and a second low-pressure reducing valve, the second one-way sequence valve and the second low-pressure reducing valve are both connected to the return oil branch pipe through an eleventh connecting pipe; It also includes a first hydraulically controlled reversing valve and a second hydraulically controlled reversing valve, wherein the oil outlet branch pipe is connected to the first hydraulically controlled reversing valve and the second hydraulically controlled reversing valve respectively through a twelfth connecting pipe, and the oil return branch pipe is connected to the first hydraulically controlled reversing valve and the second hydraulically controlled reversing valve respectively through a thirteenth connecting pipe; The first single-acting hydraulic cylinder is connected to the second hydraulically controlled reversing valve through the third control oil line, the second single-acting hydraulic cylinder is connected to the first hydraulically controlled one-way valve through the fourth control oil line, the first signal hydraulic cylinder is connected to the first hydraulically controlled one-way valve through the fifth control oil line, the second signal hydraulic cylinder is connected to the second hydraulically controlled reversing valve through the sixth control oil line, the fifth control oil line is connected to the first signal stop valve, and the sixth control oil line is connected to the second signal stop valve; The oil outlet branch pipe is provided with a first stop valve, and the oil return branch pipe is provided with a second stop valve.

[0007] Preferably, the number of the slip cylinders and the number of the elevator cylinders are both plural, and the specific number of the slip cylinders and the specific number of the elevator cylinders are both four.

[0008] Preferably, a filter, a pressure reducing valve and an oil outlet one-way valve are sequentially arranged on the oil outlet main pipe along the oil inlet direction.

[0009] Preferably, the connection point between the first connecting pipe and the first input pipeline and the connection point between the second connecting pipe and the first input pipeline are both located between the first one-way throttle valve and the slip cylinder, and the connection point between the second connecting pipe and the first output pipeline and the connection point between the second connecting pipe and the first output pipeline are both located between the second one-way throttle valve and the slip cylinder.

[0010] Preferably, the connection point between the seventh connecting pipe and the second input pipe and the connection point between the eighth connecting pipe and the second input pipe are both located between the third one-way throttle valve and the elevator cylinder, and the connection point between the seventh connecting pipe and the second output pipe and the connection point between the eighth connecting pipe and the second output pipe are both located between the fourth one-way throttle valve and the elevator cylinder.

[0011] Preferably, the connection between the sixth connecting pipe and the first output pipe is located between the connection between the third connecting pipe and the first output pipe and the first manual reversing valve, and the connection between the sixth connecting pipe and the oil return main pipe coincides with the connection between the fifth connecting pipe and the oil return main pipe.

[0012] Preferably, the connection between the return oil branch pipe and the return oil main pipe is connected to an accumulator via a fourteenth connecting pipe, the fourteenth connecting pipe is connected to an accumulator stop valve, the fourteenth connecting pipe is connected to the oil outlet main pipe, and the connection between the oil outlet main pipe and the fourteenth connecting pipe is located between the accumulator and the accumulator stop valve.

[0013] Preferably, the second stop valve is located between the connection between the oil return branch pipe and the oil return main pipe and the connection between the oil return branch pipe and the eleventh connecting pipe.

[0014] Preferably, the first output pipeline and the oil return main pipe are connected via a sixth connecting pipe, and an open overflow valve is provided on the sixth connecting pipe.

[0015] An interlocking control method for hydraulic elevators and hydraulic slips: The elevator cylinder is connected to the elevator, and the opening and clamping of the elevator is controlled by extending and retracting the elevator cylinder. The slip cylinder is connected to the slip, and the opening and clamping of the slip is controlled by extending and retracting the slip cylinder. The controller manually controls the first stop valve and the second stop valve to open to control the interlocking of the elevator and the chuck, that is, the interlocking function is turned on, and the controller manually controls the first stop valve and the second stop valve to close to control the action of the elevator or the chuck alone, that is, the interlocking function is released; The interlocking system is realized by extending the first single-acting hydraulic cylinder or the second single-acting hydraulic cylinder driven by hydraulic oil, thereby blocking the first manual reversing valve or the second manual reversing valve from reversing; There are two types of cylinders: elevator cylinders and slip cylinders. One type of cylinder can only be extended when the other type of cylinder is fully retracted. The hydraulic slips confirm the signal clamping position by adjusting the position of the first normally open stroke valve, and the hydraulic elevator confirms the signal clamping position by adjusting the position of the second normally open stroke valve; The first manual reversing valve controls the extension and retraction of the slip cylinder, and the second manual reversing valve controls the extension and retraction of the elevator cylinder; When the slip cylinder or the lifting cylinder retracts, it does not touch the first normally open stroke valve or the second normally open stroke valve. At this moment, the first clamping low-pressure relief valve or the second clamping low-pressure relief valve works, while the first clamping high-pressure relief valve or the second clamping high-pressure relief valve does not work. When the slip cylinder continues to retract, it touches the first normally open stroke valve or the second normally open stroke valve. At this moment, the first clamping low-pressure relief valve or the second clamping low-pressure relief valve does not work, while the first clamping high-pressure relief valve or the second clamping high-pressure relief valve works; The working pressure of the first clamping high-pressure relief valve and the second clamping high-pressure relief valve is 2700PSI, which is greater than the system pressure of 2500PSI after decompression; The working pressure of the first clamping low-pressure relief valve and the second clamping low-pressure relief valve is 1000PSI, which is less than the system pressure; The pressure of the slip cylinder and the elevator cylinder during retraction is relatively low, at 1000PSI. After touching the first normally open stroke valve or the second normally open stroke valve, the pressure becomes the system pressure of 2500PSI. In the above clamping state, the internal pressure of the first input pipeline becomes the system pressure 2500PSI, the oil circuits of the first one-way sequence valve and the second one-way sequence valve are opened, and the fifth control oil circuit or the sixth control oil circuit is opened through the first low-pressure reducing valve or the second low-pressure reducing valve. At this moment, the first signal cylinder or the second signal cylinder, so the red display changes to green display, meets the clamping state, and the cylinder push indication is green; At the same time, in this state, the fifth control oil route or the sixth control oil route controls the reversing of the first hydraulically controlled reversing valve or the second hydraulically controlled reversing valve respectively. At this moment, no oil enters the first single-acting hydraulic cylinder or the second single-acting hydraulic cylinder through the oil outlet main pipe, and the first single-acting hydraulic cylinder or the second single-acting hydraulic cylinder, the first manual reversing valve or the second manual reversing valve can be operated to open; The first manual reversing valve or the second manual reversing valve can be operated to open, and the first output pipeline or the second output pipeline is filled with oil. At this moment, the slip is opened and the fourth connecting pipe is filled with oil. At this moment, the first signal oil cylinder or the second signal oil cylinder is retracted, so the green display changes to red display; According to the above hydraulic interlocking principle, after the first manual reversing valve controls the slips to clamp, the slip clamping signal turns green, the second single-acting cylinder on the elevator retracts, and the second manual reversing valve can act. At this time, the second manual reversing valve can control the opening or closing of the elevator. Similarly, after the second manual reversing valve controls the elevator to clamp, the elevator clamping signal turns green, the first single-acting cylinder on the slip retracts, and the first manual reversing valve can open to achieve interlocking. Pressure holding function: Through the accumulator, the system pressure is automatically maintained when the power station is powered off, so that the elevator can remain clamped for a short time to ensure the safe operation of the drilling equipment. The accumulator stop valve connects the accumulator and the return oil pipeline to prevent back pressure in the system during maintenance.

[0016] Compared with the prior art, the advantages of the present invention are: The present invention discloses an interlocking control system and method for a hydraulic elevator and a hydraulic slip, which solves the interlocking control problem of the hydraulic elevator and the chuck and realizes a safe and reliable control function. The system's interlocking anti-false touch, slip and elevator status signal display, and pressure maintenance design greatly improve the safety and maintainability of the equipment. The external pipeline is simple and easy to connect and not easy to be misconnected. At the same time, the layout of the hydraulic system is more compact, the failure points are reduced, and the system can work stably for a long time in a complex and harsh environment. The system is suitable for wide application in oil drilling platforms. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of an interlocking control system for a hydraulic elevator and a hydraulic slip according to the present invention; Figure 2 This is the schematic diagram of the Kava control unit; Figure 3 This is the schematic diagram of the elevator control unit.

[0018] in: Slip control unit 1, elevator control unit 2; An oil outlet main pipe 101, an oil return main pipe 102, a first manual reversing valve 103, a first single-acting hydraulic cylinder 104, a first signal oil cylinder 105, a slip oil cylinder 106, a first input pipeline 107, a first output pipeline 108, a first one-way throttle valve 109, a second one-way throttle valve 110, a first connecting pipe 111, a second connecting pipe 112, a first clamping high-pressure relief valve 113, a first opening low-pressure relief valve 114, a first control oil line 115, a first clamping low-pressure relief valve 116, a first normally open stroke valve 117, a third connecting pipe 118, a fourth connecting pipe 119, a first one-way sequence valve 120, a first low-pressure pressure reducing valve 121, a fifth connecting pipe 122, a filter 123, a pressure reducing valve 124, an oil outlet one-way valve 125, a sixth connecting pipe 126, and an opening relief valve 127; The oil outlet branch pipe 201, the oil return branch pipe 202, the second manual reversing valve 203, the second single-acting hydraulic cylinder 204, the second signal oil cylinder 205, the elevator oil cylinder 206, the second input pipeline 207, the second output pipeline 208, the third one-way throttle valve 209, the fourth one-way throttle valve 210, the seventh connecting pipe 211, the eighth connecting pipe 212, the second clamping high-pressure relief valve 213, the second open low-pressure relief valve 214, the second control oil line 215, the second clamping low-pressure relief valve 216, the second normally open stroke valve 217, the ninth connecting pipe 218, the tenth connecting pipe Pipe 219, second one-way sequence valve 220, second low-pressure reducing valve 221, first hydraulically controlled reversing valve 222, second hydraulically controlled reversing valve 223, twelfth connecting pipe 224, thirteenth connecting pipe 225, third control oil route 226, fourth control oil route 227, fifth control oil route 228, sixth control oil route 229, first signal stop valve 230, second signal stop valve 231, fourteenth connecting pipe 232, accumulator 233, accumulator stop valve 234, first stop valve 235, second stop valve 236, eleventh connecting pipe 237. DETAILED DESCRIPTION

[0019] like Figure 1-3 As shown, an interlocking control system for a hydraulic elevator and a hydraulic slip in this embodiment includes a slip control unit 1 and an elevator control unit 2; The slip control unit 1 comprises an oil outlet main pipe 101, an oil return main pipe 102, a first manual reversing valve 103, a first single-acting hydraulic cylinder 104, a first signal oil cylinder 105 and a slip oil cylinder 106. A filter 123, a pressure reducing valve 124 and an oil outlet check valve 125 are sequentially arranged on the oil outlet main pipe 101 along the oil inlet direction. The oil outlet main pipe 101 and the oil return main pipe 102 are both connected to the first manual reversing valve 103. The oil inlet end of the slip oil cylinder 106 is connected to the first manual reversing valve 103 through a first input pipeline 107. The oil outlet end of the slip oil cylinder 106 is connected to the first manual reversing valve 103 through a first output pipeline 108. The first single-acting hydraulic cylinder 104 is used to realize the reversing action of the first manual reversing valve 103. The first input pipeline 107 is provided with a first one-way throttle valve 109, and the first output pipeline 108 is provided with a second one-way throttle valve 110. The first input pipeline 107 and the first output pipeline 108 are connected by a first connecting pipe 111 and a second connecting pipe 112. The connection point between the first connecting pipe 111 and the first input pipeline 107 and the connection point between the second connecting pipe 112 and the first input pipeline 107 are both located between the first one-way throttle valve 109 and the slip cylinder 106. The connection between the second connecting pipe 112 and the first output pipeline 108 is The connection point of the second connecting pipe 112 and the first output pipeline 108 are both located between the second one-way throttle valve 110 and the slip cylinder 106, the first connecting pipe 111 is provided with a first clamping high-pressure relief valve 113, the second connecting pipe 112 is provided with a first opening low-pressure relief valve 114, the first clamping high-pressure relief valve 113 and the first opening low-pressure relief valve 114 are connected through a first control oil line 115, the first control oil line 115 is provided with a first clamping low-pressure relief valve 116 and a first normally open stroke valve 117, the oil outlet end of the first signal oil cylinder 105 is connected to the first output pipeline 108 through a third connecting pipe 118 The connection point between the third connecting pipe 118 and the first output pipeline 108 is located between the second one-way throttle valve 110 and the first manual reversing valve 103. The oil inlet end of the first signal oil cylinder 105 is connected to the first input pipeline 107 through the fourth connecting pipe 119. The connection point between the fourth connecting pipe 119 and the first input pipeline 107 is located between the first one-way throttle valve 109 and the first manual reversing valve 103. The fourth connecting pipe 119 is provided with a first one-way sequence valve 120 and a first low-pressure reducing valve 121. The first one-way sequence valve 120 and the first low-pressure reducing valve 121 are both connected to the oil return main pipe 102 through a fifth connecting pipe 122. The first output pipeline 108 and the oil return main pipe 102 are connected through a sixth connecting pipe 126, and an open overflow valve 127 is provided on the sixth connecting pipe 126. The connection between the sixth connecting pipe 126 and the first output pipeline 108 is located between the connection between the third connecting pipe 118 and the first output pipeline 108 and the first manual reversing valve 103. The connection between the sixth connecting pipe 126 and the oil return main pipe 102 coincides with the connection between the fifth connecting pipe 122 and the oil return main pipe 102. There are multiple slip cylinders 106, and the specific number of slip cylinders 106 is four; The elevator control unit 2 includes an oil outlet branch pipe 201, an oil return branch pipe 202, a second manual reversing valve 203, a second single-acting hydraulic cylinder 204, a second signal oil cylinder 205 and an elevator oil cylinder 206. The oil outlet main pipe 101 is connected to the second manual reversing valve 203 through the oil outlet branch pipe 201, and the oil return main pipe 102 is connected to the second manual reversing valve 203 through the oil return branch pipe 202. The connection between the oil return branch pipe 202 and the oil return main pipe 102 is located between the connection between the fifth connecting pipe 122 and the oil return main pipe 102 and the output end of the oil return main pipe 102. The oil inlet end of the elevator oil cylinder 206 is connected to the second manual reversing valve 203 through the second input pipeline 207. The oil outlet end of 206 is connected to the second manual reversing valve 203 through the second output pipeline 208. The second single-acting hydraulic cylinder 204 is used to realize the reversing action of the second manual reversing valve 203. The second input pipeline 207 is provided with a third one-way throttle valve 209. The second output pipeline 208 is provided with a fourth one-way throttle valve 210. A seventh connecting pipe 211 and an eighth connecting pipe 212 are connected between the second input pipeline 207 and the second output pipeline 208. The connection point between the seventh connecting pipe 211 and the second input pipeline 207 and the connection point between the eighth connecting pipe 212 and the second input pipeline 207 are both located between the third one-way throttle valve 209 and the elevator cylinder 206. The connection point between the seventh connecting pipe 211 and the second output pipeline 208 and the connection point between the eighth connecting pipe 212 and the second output pipeline 208 are both located between the fourth one-way throttle valve 210 and the elevator cylinder 206. The seventh connecting pipe 211 is provided with a second clamping high-pressure relief valve 213, and the eighth connecting pipe 212 is provided with a second opening low-pressure relief valve 214. The second clamping high-pressure relief valve 213 and the second opening low-pressure relief valve 214 are connected through a second control oil line 215. The second control oil line 215 is provided with a second clamping low-pressure relief valve 216 and a second normally open stroke valve 217. The oil outlet end of the second signal cylinder 205 is connected through the ninth connecting pipe 218. The ninth connecting pipe 218 is connected to the second output pipeline 208, and the connection point between the ninth connecting pipe 218 and the second output pipeline 208 is located between the fourth one-way throttle valve 210 and the second manual reversing valve 203. The oil inlet end of the second signal oil cylinder 205 is connected to the second input pipeline 207 through the tenth connecting pipe 219, and the connection point between the tenth connecting pipe 219 and the second input pipeline 207 is located between the third one-way throttle valve 209 and the second manual reversing valve 203. The tenth connecting pipe 219 is provided with a second one-way sequence valve 220 and a second low-pressure reducing valve 221. The second one-way sequence valve 220 and the second low-pressure reducing valve 221 are both connected to the oil return branch pipe 202 through the eleventh connecting pipe 237; It also includes a first hydraulically controlled reversing valve 222 and a second hydraulically controlled reversing valve 223, the oil outlet branch pipe 201 is connected to the first hydraulically controlled reversing valve 222 and the second hydraulically controlled reversing valve 223 through a twelfth connecting pipe 224, and the oil return branch pipe 202 is connected to the first hydraulically controlled reversing valve 222 and the second hydraulically controlled reversing valve 223 through a thirteenth connecting pipe 225; The first single-acting hydraulic cylinder 104 is connected to the second hydraulically controlled reversing valve 223 through the third control oil line 226, the second single-acting hydraulic cylinder 204 is connected to the first hydraulically controlled one-way valve through the fourth control oil line 227, the first signal hydraulic cylinder 105 is connected to the first hydraulically controlled one-way valve through the fifth control oil line 228, the second signal hydraulic cylinder 205 is connected to the second hydraulically controlled reversing valve 223 through the sixth control oil line 229, the fifth control oil line 228 is connected to the first signal stop valve 230, and the sixth control oil line 229 is connected to the second signal stop valve 231; The connection between the oil return branch pipe 202 and the oil return main pipe 102 is connected to an accumulator 233 through a fourteenth connecting pipe 232, and an accumulator stop valve 234 is connected to the fourteenth connecting pipe 232. The fourteenth connecting pipe 232 is connected to the oil outlet main pipe 101, and the connection between the oil outlet main pipe 101 and the fourteenth connecting pipe 232 is located between the accumulator 233 and the accumulator stop valve 234. The oil outlet branch pipe 201 is provided with a first stop valve 235, and the oil return branch pipe 202 is provided with a second stop valve 236, and the second stop valve 236 is located between the connection between the oil return branch pipe 202 and the oil return main pipe 102 and the connection between the oil return branch pipe 202 and the eleventh connecting pipe 237; There are multiple elevator cylinders 206, and the number of elevator cylinders 206 is four; The interlock control system is installed in the control area of ​​the drilling platform. The elevator cylinder 206 is connected to the elevator. The elevator is opened and clamped by extending and retracting the elevator cylinder 206. The slip cylinder 106 is connected to the slip. The slip is opened and clamped by extending and retracting the slip cylinder 106. The control personnel manually controls the first stop valve 235 and the second stop valve 236 to open to control the interlocking of the elevator and the chuck, that is, the interlocking function is turned on, and the control personnel manually controls the first stop valve 235 and the second stop valve 236 to close to control the movement of the elevator or the chuck alone, that is, the interlocking function is released; The interlocking system is realized by extending the first single-acting hydraulic cylinder 104 or the second single-acting hydraulic cylinder 204 driven by hydraulic oil, thereby blocking the first manual reversing valve 103 or the second manual reversing valve 203 from reversing; That is, the elevator cylinder 206 and the slip cylinder 106 can be retracted at the same time, but cannot be extended at the same time. Specifically, the elevator cylinder 206 and the slip cylinder 106 are two types of cylinders, and one of the cylinders can be extended only when the other cylinder is fully retracted; The hydraulic slips confirm the signal clamping position by adjusting the position of the first normally open stroke valve 117, and the hydraulic elevator confirms the signal clamping position by adjusting the position of the second normally open stroke valve 217; The first manual reversing valve 103 controls the extension and retraction of the slip cylinder 106 , and the second manual reversing valve 203 controls the extension and retraction of the elevator cylinder 206 ; When the slip cylinder 106 or the lifting cylinder 206 retracts, it does not touch the first normally open stroke valve 117 or the second normally open stroke valve 217. At this moment, the first clamping low-pressure relief valve 116 or the second clamping low-pressure relief valve 216 works, while the first clamping high-pressure relief valve 113 or the second clamping high-pressure relief valve 213 does not work. When the slip cylinder 106 continues to retract, it touches the first normally open stroke valve 117 or the second normally open stroke valve 217. At this moment, the first clamping low-pressure relief valve 116 or the second clamping low-pressure relief valve 216 does not work, while the first clamping high-pressure relief valve 113 or the second clamping high-pressure relief valve 213 works; The working pressure of the first clamping high-pressure relief valve 113 and the second clamping high-pressure relief valve 213 is 2700PSI, which is greater than the system pressure of 2500PSI after decompression; The working pressure of the first clamping low-pressure relief valve 116 and the second clamping low-pressure relief valve 216 is 1000PSI, which is less than the system pressure; The pressure during the retraction of the slip cylinder 106 and the elevator cylinder 206 is relatively low, at 1000PSI. After touching the first normally open stroke valve 117 or the second normally open stroke valve 217, the pressure becomes the system pressure of 2500PSI. Each pressure within the system pressure can be changed to other values; In the above clamping state, the internal pressure of the first input pipeline 107 becomes the system pressure 2500PSI, the oil circuits of the first one-way sequence valve 120 and the second one-way sequence valve 220 are opened, and the fifth control oil line 228 or the sixth control oil line 229 is opened through the first low-pressure reducing valve 121 or the second low-pressure reducing valve 221. At this moment, the first signal cylinder 105 or the second signal cylinder 205, so the red display changes to green display, meets the clamping state, and the cylinder push indication is green; At the same time, in this state, the fifth control oil line 228 or the sixth control oil line 229 controls the first hydraulic control reversing valve 222 or the second hydraulic control reversing valve 223 to change direction respectively. At this moment, no oil enters the first single-acting hydraulic cylinder 104 or the second single-acting hydraulic cylinder 204 from the oil outlet main pipe 101, and the first single-acting hydraulic cylinder 104 or the second single-acting hydraulic cylinder 204, the first manual reversing valve 103 or the second manual reversing valve 203 can be operated to open; The first manual reversing valve 103 or the second manual reversing valve 203 can be operated to open, and the first output pipeline 108 or the second output pipeline 208 is filled with oil. At this moment, the slips are opened and the fourth connecting pipe 119 is filled with oil. At this moment, the first signal oil cylinder 105 or the second signal oil cylinder 205 is retracted, so the green display changes to red display; According to the above hydraulic interlocking principle, after the first manual reversing valve 103 controls the slips to clamp, the slip clamping signal turns green, the second single-acting cylinder 204 on the elevator retracts, and the second manual reversing valve 203 can act. At this time, the second manual reversing valve 203 can control the opening or closing of the elevator. Similarly, after the second manual reversing valve 203 controls the elevator to clamp, the elevator clamping signal changes to green, the first single-acting cylinder 104 on the slips retracts, and the first manual reversing valve 103 can open, thereby achieving interlocking; Pressure holding function: through the accumulator 233, the system pressure is automatically maintained when the power station is powered off, so that the elevator can be kept in a clamped state for a short time to ensure the safe operation of the drilling equipment. The accumulator stop valve 234 connects the accumulator 233 and the return oil pipeline to prevent back pressure in the system during maintenance; The system simplifies the pipe connection between the control cabinet and the elevator, and meets the signal display requirements. The pipes are simple and easy to connect, and are not easy to connect incorrectly. At the same time, it makes the hydraulic system layout more compact and reduces the number of failure points. Here, it should be noted that a chuck cylinder can be provided separately, and the chuck cylinder is connected to the chuck. The hydraulic operation principle of the chuck cylinder is the same as that of the slip cylinder 106. The functions of the slip and the chuck are both to hold the pipe column. The chuck is used on the turntable, and the slip is used under the turntable. In summary, the interlocking control problem of the hydraulic elevator and the chuck is solved, and a safe and reliable control function is realized. The system's interlocking anti-false touch, slip and elevator status signal display, and pressure maintenance design have greatly improved the safety and maintainability of the equipment. The external pipeline is simple and easy to connect and not easy to connect incorrectly. At the same time, it makes the hydraulic system layout more compact, reduces failure points, and enables it to work stably for a long time in complex and harsh environments. It is suitable for wide application in oil drilling platforms.

[0020] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. An interlocking control system for a hydraulic elevator and a hydraulic slip, comprising a slip control unit (1) and an elevator control unit (2), characterized in that: The slip control unit (1) comprises an oil outlet main pipe (101), an oil return main pipe (102), a first manual reversing valve (103), a first single-acting hydraulic cylinder (104), a first signal oil cylinder (105) and a slip oil cylinder (106). The oil outlet main pipe (101) and the oil return main pipe (102) are both connected to the first manual reversing valve (103). The oil inlet end of the slip oil cylinder (106) is connected to the first manual reversing valve (103) via a first input pipe (107). The oil outlet end of the slip oil cylinder (106) is connected to the first manual reversing valve (103) via a first output pipe (108). 3) connection, the first single-acting hydraulic cylinder (104) is used to realize the reversing action of the first manual reversing valve (103), the first input pipeline (107) is provided with a first one-way throttle valve (109), the first output pipeline (108) is provided with a second one-way throttle valve (110), a first connecting pipe (111) and a second connecting pipe (112) are connected between the first input pipeline (107) and the first output pipeline (108), the first connecting pipe (111) is provided with a first clamping high-pressure relief valve (113), and the second connecting pipe (112) is provided with a first The first clamping high-pressure relief valve (113) and the first opening low-pressure relief valve (114) are connected via a first control oil line (115), and the first control oil line (115) is provided with a first clamping low-pressure relief valve (116) and a first normally open stroke valve (117). The oil outlet end of the first signal oil cylinder (105) is connected to the first output pipeline (108) via a third connecting pipe (118), and the connection point between the third connecting pipe (118) and the first output pipeline (108) is located between the second one-way throttle valve (110) and the first manual reversing valve (111). 03), the oil inlet end of the first signal oil cylinder (105) is connected to the first input pipeline (107) through a fourth connecting pipe (119), the connection point between the fourth connecting pipe (119) and the first input pipeline (107) is located between the first one-way throttle valve (109) and the first manual reversing valve (103), the fourth connecting pipe (119) is provided with a first one-way sequence valve (120) and a first low-pressure pressure reducing valve (121), and the first one-way sequence valve (120) and the first low-pressure pressure reducing valve (121) are both connected to the oil return main pipe (102) through a fifth connecting pipe (122); The elevator control unit (2) comprises an oil outlet branch pipe (201), an oil return branch pipe (202), a second manual reversing valve (203), a second single-acting hydraulic cylinder (204), a second signal oil cylinder (205) and an elevator oil cylinder (206); the oil outlet main pipe (101) is connected to the second manual reversing valve (203) via the oil outlet branch pipe (201); the oil return main pipe (102) is connected to the second manual reversing valve (203) via the oil return branch pipe (202); the connection between the oil return branch pipe (202) and the oil return main pipe (102) is located between the connection between the fifth connecting pipe (122) and the oil return main pipe (102) and the output end of the oil return main pipe (102); The oil inlet end of the cylinder (206) is connected to the second manual reversing valve (203) via a second input pipeline (207); the oil outlet end of the elevator cylinder (206) is connected to the second manual reversing valve (203) via a second output pipeline (208); the second single-acting hydraulic cylinder (204) is used to realize the reversing action of the second manual reversing valve (203); a third one-way throttle valve (209) is provided on the second input pipeline (207); a fourth one-way throttle valve (210) is provided on the second output pipeline (208); a seventh connecting pipe (211) and an eighth connecting pipe (212) are connected between the second input pipeline (207) and the second output pipeline (208); ), the seventh connecting pipe (211) is provided with a second clamping high-pressure relief valve (213), the eighth connecting pipe (212) is provided with a second opening low-pressure relief valve (214), the second clamping high-pressure relief valve (213) and the second opening low-pressure relief valve (214) are connected via a second control oil line (215), the second control oil line (215) is provided with a second clamping low-pressure relief valve (216) and a second normally open stroke valve (217), the oil outlet end of the second signal oil cylinder (205) is connected to the second output pipeline (208) via a ninth connecting pipe (218), the connection between the ninth connecting pipe (218) and the second output pipeline (208) The oil inlet end of the second signal oil cylinder (205) is connected to the second input pipeline (207) through a tenth connecting pipe (219); the connection point between the tenth connecting pipe (219) and the second input pipeline (207) is located between the third one-way throttle valve (209) and the second manual reversing valve (203); a second one-way sequence valve (220) and a second low-pressure reducing valve (221) are provided on the tenth connecting pipe (219); the second one-way sequence valve (220) and the second low-pressure reducing valve (221) are both connected to the oil return branch pipe (202) through an eleventh connecting pipe (237); It also comprises a first hydraulically controlled reversing valve (222) and a second hydraulically controlled reversing valve (223), wherein the oil outlet branch pipe (201) is respectively connected to the first hydraulically controlled reversing valve (222) and the second hydraulically controlled reversing valve (223) via a twelfth connecting pipe (224), and the oil return branch pipe (202) is respectively connected to the first hydraulically controlled reversing valve (222) and the second hydraulically controlled reversing valve (223) via a thirteenth connecting pipe (225); The first single-acting hydraulic cylinder (104) is connected to the second hydraulically controlled reversing valve (223) via a third control oil line (226), the second single-acting hydraulic cylinder (204) is connected to the first hydraulically controlled one-way valve via a fourth control oil line (227), the first signal hydraulic cylinder (105) is connected to the first hydraulically controlled one-way valve via a fifth control oil line (228), the second signal hydraulic cylinder (205) is connected to the second hydraulically controlled reversing valve (223) via a sixth control oil line (229), the fifth control oil line (228) is connected to a first signal stop valve (230), and the sixth control oil line (229) is connected to a second signal stop valve (231); The oil outlet branch pipe (201) is provided with a first stop valve (235), and the oil return branch pipe (202) is provided with a first stop valve (235).

2. An interlocking control system for hydraulic elevators and hydraulic slips according to claim 1, characterized in that: The number of the slip cylinders (106) and the number of the elevator cylinders (206) are both set in plural numbers, and the specific number of the slip cylinders (106) and the specific number of the elevator cylinders (206) are both four.

3. The interlocking control system for hydraulic elevators and hydraulic slips according to claim 1, characterized in that: A filter (123), a pressure reducing valve (124) and an oil outlet check valve (125) are sequentially arranged on the oil outlet main pipe (101) along the oil inlet direction.

4. The interlocking control system for hydraulic elevators and hydraulic slips according to claim 1, characterized in that: The connection point between the first connecting pipe (111) and the first input pipe (107) and the connection point between the second connecting pipe (112) and the first input pipe (107) are both located between the first one-way throttle valve (109) and the slip cylinder (106); the connection point between the second connecting pipe (112) and the first output pipe (108) and the connection point between the second connecting pipe (112) and the first output pipe (108) are both located between the second one-way throttle valve (110) and the slip cylinder (106).

5. The interlocking control system for hydraulic elevators and hydraulic slips according to claim 1, characterized in that: The connection point between the seventh connecting pipe (211) and the second input pipe (207) and the connection point between the eighth connecting pipe (212) and the second input pipe (207) are both located between the third one-way throttle valve (209) and the elevator cylinder (206); the connection point between the seventh connecting pipe (211) and the second output pipe (208) and the connection point between the eighth connecting pipe (212) and the second output pipe (208) are both located between the fourth one-way throttle valve (210) and the elevator cylinder (206).

6. The interlocking control system for hydraulic elevators and hydraulic slips according to claim 1, characterized in that: The connection point between the sixth connecting pipe (126) and the first output pipe (108) is located between the connection point between the third connecting pipe (118) and the first output pipe (108) and the first manual reversing valve (103), and the connection point between the sixth connecting pipe (126) and the oil return main pipe (102) overlaps with the connection point between the fifth connecting pipe (122) and the oil return main pipe (102).

7. The interlocking control system for hydraulic elevators and hydraulic slips according to claim 1, characterized in that: The connection point between the oil return branch pipe (202) and the oil return main pipe (102) is connected to an accumulator (233) via a fourteenth connecting pipe (232); an accumulator stop valve (234) is connected to the fourteenth connecting pipe (232); the fourteenth connecting pipe (232) is connected to the oil outlet main pipe (101); and the connection point between the oil outlet main pipe (101) and the fourteenth connecting pipe (232) is located between the accumulator (233) and the accumulator stop valve (234).

8. The interlocking control system for hydraulic elevators and hydraulic slips according to claim 1, characterized in that: The second stop valve (236) is located between the connection between the oil return branch pipe (202) and the oil return main pipe (102) and between the connection between the oil return branch pipe (202) and the eleventh connecting pipe (237).

9. The interlocking control system for hydraulic elevators and hydraulic slips according to claim 1, characterized in that: The first output pipeline (108) and the oil return main pipe (102) are connected via a sixth connecting pipe (126), and an open overflow valve (127) is provided on the sixth connecting pipe (126).

10. An interlocking control method for hydraulic elevators and hydraulic slips, characterized in that: The elevator cylinder (206) is connected to the elevator, and the opening and clamping of the elevator are controlled by extending and retracting the elevator cylinder (206); the slip cylinder (106) is connected to the slip, and the opening and clamping of the slip are controlled by extending and retracting the slip cylinder (106); The control personnel manually controls the first stop valve (235) and the second stop valve (236) to open to control the interlocking of the elevator and the chuck, that is, the interlocking function is turned on, and the control personnel manually controls the first stop valve (235) and the second stop valve (236) to close to control the movement of the elevator or the chuck alone, that is, the interlocking function is released; The interlocking system is realized by extending the first single-acting hydraulic cylinder (104) or the second single-acting hydraulic cylinder (204) driven by hydraulic oil, thereby blocking the first manual reversing valve (103) or the second manual reversing valve (203) from reversing; Two types of cylinders, the elevator cylinder (206) and the slip cylinder (106), one of which can be extended only when the other cylinder is fully retracted; The hydraulic slip confirms the signal clamping position by adjusting the position of the first normally open stroke valve (117), and the hydraulic elevator confirms the signal clamping position by adjusting the position of the second normally open stroke valve (217); The first manual reversing valve (103) controls the extension and retraction of the slip cylinder (106), and the second manual reversing valve (203) controls the extension and retraction of the elevator cylinder (206); When the slip cylinder (106) or the lifting cylinder (206) retracts, it does not touch the first normally open stroke valve (117) or the second normally open stroke valve (217). At this moment, the first clamping low-pressure relief valve (116) or the second clamping low-pressure relief valve (216) works, while the first clamping high-pressure relief valve (113) or the second clamping high-pressure relief valve (213) does not work. When the slip cylinder (106) continues to retract, it touches the first normally open stroke valve (117) or the second normally open stroke valve (217). At this moment, the first clamping low-pressure relief valve (116) or the second clamping low-pressure relief valve (216) does not work, while the first clamping high-pressure relief valve (113) or the second clamping high-pressure relief valve (213) works; The working pressure of the first clamping high-pressure relief valve (113) and the second clamping high-pressure relief valve (213) is 2700PSI, which is greater than the system pressure of 2500PSI after decompression; The working pressure of the first clamping low-pressure relief valve (116) and the second clamping low-pressure relief valve (216) is 1000 PSI, which is less than the system pressure; During the retraction process of the slip cylinder (106) and the elevator cylinder (206), the pressure is relatively low, namely, 1000 PSI. After the pressure touches the first normally open stroke valve (117) or the second normally open stroke valve (217), the pressure becomes the system pressure of 2500 PSI. In the above clamping state, the internal pressure of the first input pipeline (107) becomes the system pressure 2500PSI, the oil circuits of the first one-way sequence valve (120) and the second one-way sequence valve (220) are opened, and through the first low-pressure reducing valve (121) or the second low-pressure reducing valve (221), the fifth control oil route (228) or the sixth control oil route (229) is opened. At this moment, the first signal cylinder (105) or the second signal cylinder (205), so the red display changes to green display, meets the clamping state, and the cylinder push indication is green; At the same time, in this state, the fifth control oil route (228) or the sixth control oil route (229) controls the first hydraulically controlled reversing valve (222) or the second hydraulically controlled reversing valve (223) to change direction respectively. At this moment, no oil enters the first single-acting hydraulic cylinder (104) or the second single-acting hydraulic cylinder (204) from the oil outlet main pipe (101). The first single-acting hydraulic cylinder (104) or the second single-acting hydraulic cylinder (204), the first manual reversing valve (103) or the second manual reversing valve (203) can then be operated to open; The first manual reversing valve (103) or the second manual reversing valve (203) is operable to open, and oil is introduced into the first output pipe (108) or the second output pipe (208). At this moment, the slip is opened and oil is introduced into the fourth connecting pipe (119). At this moment, the first signal oil cylinder (105) or the second signal oil cylinder (205) is retracted, so the green display changes to a red display; According to the above hydraulic interlocking principle, after the first manual reversing valve (103) controls the slips to clamp, the slip clamping signal turns green, the second single-acting hydraulic cylinder (204) on the elevator retracts, and the second manual reversing valve (203) can be actuated. At this time, the second manual reversing valve (203) can control the opening or closing of the elevator. Similarly, after the second manual reversing valve (203) controls the elevator to clamp, the elevator clamping signal changes to green, the first single-acting cylinder (104) on the slip retracts, and the first manual reversing valve (103) can then open, thereby achieving interlocking; Pressure maintaining function: through the accumulator (233), the system pressure is automatically maintained when the power station is powered off, so that the elevator can be kept in a clamped state for a short period of time, ensuring the safe operation of the drilling equipment. The accumulator stop valve (234) connects the accumulator (233) and the return oil pipeline, which is convenient for maintenance and prevents back pressure in the system.

Images