A fast response load sensing system

Abstract

The application discloses a kind of quick response load sensing system, including hydraulic station, and hydraulic station is respectively connected with hydraulic valve group by pressure feedback pipeline, oil supply pipeline, oil return pipeline and oil drain pipeline, and hydraulic valve group is connected with actuator by control pipeline, and hydraulic station and hydraulic valve group are also connected with electric control system by cable.The quick response load sensing system of the application realizes the quick response of load sensing system under the condition of low-temperature environment and long-distance working condition, and improves the working efficiency and control accuracy of control equipment.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic control technology for automated equipment of oil drilling and repair rig tubing, and relates to a fast-response load-sensitive system. Background Technology

[0002] The integration of automated tubing systems with oil drilling rigs has become a growing trend in recent years, and the performance of these automated tubing equipment is receiving increasing attention. Currently, most automated tubing equipment utilizes hydraulic drive and control, with the hydraulic systems primarily employing load-sensitive control principles. Therefore, the performance of the hydraulic system plays a crucial role in the overall performance of the automated tubing equipment. Hydraulic systems are affected by ambient temperature and pipeline length, exhibiting issues of lag and overshoot, which impact control accuracy and operational stability. Equipment such as the second-level tubing jack in automated tubing systems, due to their high installation height and distance from the hydraulic station, with supply and return oil pipelines and load feedback pipelines approaching 50 meters in length, exhibits slow response times, particularly noticeable in winter, thus affecting equipment efficiency and control accuracy.

[0003] Conventional load-sensitive control systems employ a hydraulic load feedback control scheme. The load-sensitive valve feeds back the maximum load pressure of each control loop to the variable displacement mechanism of the load-sensitive pump via hydraulic lines, altering its displacement and pressure to adapt to changes in load speed and force requirements. However, hydraulic load feedback systems suffer from drawbacks such as long hydraulic lines, slow pressure increase, lag response, and low control accuracy.

[0004] The electronic overload sensitive control system uses a proportional electromagnet to adjust the pressure difference setpoint between the pump outlet pressure and the feedback pressure. Increasing the control current decreases the pressure difference setpoint, and decreasing the control current increases the pressure difference setpoint. This control method can only adjust the setpoint of the differential pressure valve, and also requires the load sensitive valve to provide feedback on the load pressure to increase the pump's output pressure. It also suffers from problems such as long hydraulic lines, slow pressure increase, lag response, and low control accuracy. Summary of the Invention

[0005] The purpose of this invention is to provide a fast-response load-sensitive system that enables rapid response of the load-sensitive system under long-distance operating conditions in low-temperature environments, thereby improving the working efficiency and control accuracy of control equipment.

[0006] The technical solution adopted in this invention is a fast-response load-sensitive system, including a hydraulic station. The hydraulic station is connected to a hydraulic valve group through a pressure feedback pipeline, an oil supply pipeline, an oil return pipeline, and an oil drain pipeline. The hydraulic valve group is connected to an actuator through a control pipeline. The hydraulic station and the hydraulic valve group are also connected to an electrical control system through cables.

[0007] The invention is further characterized in that,

[0008] The hydraulic power unit includes a load-sensitive hydraulic pump assembly. The oil supply port P of the load-sensitive hydraulic pump assembly is connected to the oil inlet of an electro-proportional pressure reducing valve. The output port of the electro-proportional pressure reducing valve is also connected to a shuttle valve. The shuttle valve is also connected to the feedback port X of the load-sensitive hydraulic pump assembly. The shuttle valve is also connected to a pressure feedback pipeline. The return port of the electro-proportional pressure reducing valve is connected to a return pipeline. The oil supply port P of the load-sensitive hydraulic pump assembly is also connected to a second pressure sensor. The oil supply port P of the load-sensitive hydraulic pump assembly is also connected to the oil supply pipeline.

[0009] The hydraulic station also includes an oil tank, which is equipped with a hydraulic oil temperature sensor. The oil inlet of the load-sensitive hydraulic pump unit is connected to the oil tank, and the oil outlet of the load-sensitive hydraulic pump unit is connected to the oil tank through the pump unit's oil outlet pipeline. The oil tank is also connected to the return oil pipeline.

[0010] The load-sensitive hydraulic pump unit is connected to the oil suction port and the oil tank with an oil suction filter, and the oil tank is connected to the return oil line with a return oil filter.

[0011] The hydraulic valve assembly includes a load-sensitive multi-way directional valve assembly. The LS port of the load-sensitive multi-way directional valve assembly is connected to the inlet of a solenoid directional valve. The output port of the solenoid directional valve is connected to a shuttle valve through a pressure feedback pipeline. A first pressure sensor is also connected between the LS port of the load-sensitive multi-way directional valve assembly and the inlet of the solenoid directional valve. The P port of the load-sensitive multi-way directional valve assembly is connected to the inlet of an electro-proportional throttle valve. The output port of the electro-proportional throttle valve is connected to a return oil pipeline. The working ports A, B, A, and B of the load-sensitive multi-way directional valve assembly are connected to the actuators through control pipelines. The P port of the load-sensitive multi-way directional valve assembly is connected to the supply port P of the load-sensitive hydraulic pump assembly through a supply oil pipeline. The R port of the load-sensitive multi-way directional valve assembly is connected to a return oil filter through a return oil pipeline. The T port of the load-sensitive multi-way directional valve assembly is also connected to an oil tank through a drain oil pipeline.

[0012] The electronic control system includes a control unit, which is electrically connected to an operation display unit, a control switch, and a control handle via cables. The control unit is also connected to a solenoid directional valve, a load-sensitive multi-way directional valve group, an electro-proportional throttle valve, an electro-proportional pressure reducing valve, a first pressure sensor, a second pressure sensor, and a hydraulic oil temperature sensor via cables.

[0013] The electro-proportional throttle valve is either a manual directional valve or a solenoid directional valve.

[0014] The electromagnetic directional valve is a two-position, two-way valve.

[0015] The control unit includes a PLC controller, which is electrically connected to a power module, a proportional amplifier, and terminal blocks via cables. The proportional amplifier is also electrically connected to the terminal blocks via cables. The operation display unit is electrically connected to the PLC controller and the power module via cables. The control switch and control handle are connected to the PLC controller via cables. The solenoid directional valve, the load-sensitive multi-way directional valve group, the electro-proportional throttle valve, the electro-proportional pressure reducing valve, the first pressure sensor, the second pressure sensor, and the hydraulic oil temperature sensor are all electrically connected to the terminal blocks via cables.

[0016] The electro-proportional pressure reducing valve is a three-way type pressure reducing valve.

[0017] The beneficial effects of this invention are:

[0018] 1. This invention can control the temperature of hydraulic oil in both hydraulic pipelines and hydraulic oil tanks in hydraulic stations, ensuring that the hydraulic oil in the system is always within the ideal viscosity range and improving the system's response speed in low-temperature environments.

[0019] 2. This invention uses electrical signal feedback of system load pressure to avoid problems such as feedback lag in hydraulic feedback loops, which can affect system response speed and control accuracy due to long pipelines and high hydraulic oil viscosity.

[0020] 3. This invention retains the hydraulic feedback loop, and the two feedback systems, hydraulic feedback and electrical signal feedback, do not affect each other, thus improving system reliability.

[0021] 4. This invention is automatically controlled by an electronic control system, eliminating the need for human intervention and improving the system's automation level and control accuracy. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a fast-response load-sensitive system according to the present invention.

[0023] In the diagram, 1. Hydraulic station, 2. Hydraulic valve group, 3. Actuator, 4. Electrical control system, 5-1. First pressure sensor, 5-2. Second pressure sensor, 6. Solenoid directional valve, 7. Load-sensitive multi-way valve, 8. Electro-proportional throttle valve, 9. Shuttle valve, 10. Electro-proportional pressure reducing valve, 11. Temperature sensor, 12. Load-sensitive hydraulic pump, 13. Pressure feedback pipeline, 14. Supply pipeline, 15. Return pipeline, 16. Drain pipeline, 17. Control pipeline, 18. Oil tank, 19. Pump group drain pipeline, 20. Suction filter, 21. Return filter, 22. Power module, 23. PLC control module, 24. Proportional amplifier, 25. Terminal block, 26. Control display unit, 27. Control switch, 28. Control handle. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0025] This invention discloses a fast-response load-sensitive system, the structure of which is as follows: Figure 1 As shown, the system includes a hydraulic station 1, which is connected to a hydraulic valve group 2 via a pressure feedback pipeline 13, an oil supply pipeline 14, an oil return pipeline 15, and an oil drain pipeline 16. The hydraulic valve group 2 is connected to an actuator 3 via a control pipeline 17. The hydraulic station 1 and the hydraulic valve group 2 are also connected to an electrical control system 4 via cables.

[0026] The hydraulic power unit 1 includes a load-sensitive hydraulic pump assembly 12. The oil supply port P of the load-sensitive hydraulic pump assembly 12 is connected to the oil inlet of an electro-proportional pressure reducing valve 10. The output port of the electro-proportional pressure reducing valve 10 is also connected to a shuttle valve 9. The shuttle valve 9 is also connected to the feedback port X of the load-sensitive hydraulic pump assembly 12. The shuttle valve 9 is also connected to a pressure feedback pipeline 13. The return port of the electro-proportional pressure reducing valve 10 is connected to a return pipeline 15. The oil supply port P of the load-sensitive hydraulic pump assembly 12 is also connected to a second pressure sensor 5-2. The oil supply port P of the load-sensitive hydraulic pump assembly 12 is also connected to an oil supply pipeline 14.

[0027] The hydraulic station 1 also includes an oil tank 18, on which a hydraulic oil temperature sensor 11 is installed. The oil inlet of the load-sensitive hydraulic pump group 12 is connected to the oil tank 18. The oil outlet of the load-sensitive hydraulic pump group 12 is connected to the oil tank 18 through the pump group oil outlet pipeline 19. The oil tank 18 is also connected to the return oil pipeline 15.

[0028] A suction filter 20 is connected between the suction port of the load-sensitive hydraulic pump unit 12 and the oil tank 18, and a return filter 21 is connected between the oil tank 18 and the return oil line 15.

[0029] Hydraulic valve assembly 2 includes a load-sensitive multi-way directional valve assembly 7. The LS port of the load-sensitive multi-way directional valve assembly 7 is connected to the inlet of a solenoid directional valve 6. The output port of the solenoid directional valve 6 is connected to a shuttle valve 9 via a pressure feedback pipeline 13. A first pressure sensor 5-1 is also connected between the LS port of the load-sensitive multi-way directional valve assembly 7 and the inlet of the solenoid directional valve 6. The P1 port of the load-sensitive multi-way directional valve assembly 7 is connected to the inlet of an electro-proportional throttle valve 8. The output port is connected to the return oil line 15. The working ports A1, B1, A2, and B2 of the load-sensitive multi-way directional valve group 7 are connected to the actuator 3 through the control line 17. The P port of the load-sensitive multi-way directional valve group 7 is connected to the oil supply port P of the load-sensitive hydraulic pump group 12 through the oil supply line 14. The R port of the load-sensitive multi-way directional valve group 7 is connected to the return oil filter 21 through the return oil line 15. The T port of the load-sensitive multi-way directional valve group 7 is also connected to the oil tank 18 through the drain line 16.

[0030] Load-sensitive multi-way directional valve assembly 7: Brand: HAWE, Model: PSV3 / 210-5

[0031] Load-sensitive hydraulic pump unit 12: Brand: Rexroth, Model: A11VO145LRDS / 11R

[0032] The electronic control system 4 includes a control unit 4-1, which is electrically connected to an operation display unit 26, a control switch 27, and a control handle 28 via cables. The control unit 4-1 is also connected to an electromagnetic directional valve 6, a load-sensitive multi-way directional valve group 7, an electro-proportional throttle valve 8, an electro-proportional pressure reducing valve 10, a first pressure sensor 5-1, a second pressure sensor 5-2, and a hydraulic oil temperature sensor 11 via cables.

[0033] The electro-proportional throttle valve 8 is either a manual directional valve or a solenoid directional valve.

[0034] The electromagnetic directional valve 6 is a two-position, two-way valve.

[0035] The control unit 4-1 includes a PLC controller 23. The PLC controller 23 is electrically connected to a power module 22, a proportional amplifier 24, and a terminal block 25 via cables. The proportional amplifier 24 is also electrically connected to the terminal block 25 via cables. The operation display unit 26 is electrically connected to the PLC controller 23 and the power module 22 via cables. The control switch 27 and the control handle 28 are connected to the PLC controller 23 via cables. The electromagnetic reversing valve 6, the load-sensitive multi-way reversing valve group 7, the electro-proportional throttle valve 8, the electro-proportional pressure reducing valve 10, the first pressure sensor 5-1, the second pressure sensor 5-2, and the hydraulic oil temperature sensor 11 are all electrically connected to the terminal block 25 via cables.

[0036] The electro-proportional pressure reducing valve 10 is a three-way pressure reducing valve.

[0037] The hydraulic valve assembly of this invention includes a throttle valve to achieve hydraulic oil air circulation control. A first pressure sensor is provided for load pressure detection. An electromagnetic directional valve is included for load feedback pressure on / off control. A load-sensitive multi-way directional valve assembly is provided for motion control of the actuator.

[0038] The hydraulic power unit is equipped with a hydraulic oil temperature sensor for oil temperature monitoring. A second pressure sensor is installed to monitor the hydraulic pump output pressure. An electro-proportional pressure reducing valve enables proportional control of the load-sensitive hydraulic pump. A load-sensitive hydraulic pump unit provides hydraulic power output. Accessories such as an oil filter, air filter, and level gauge are included to ensure the normal operation of the hydraulic power unit.

[0039] The electronic control system includes a control unit to acquire signals from the first pressure sensor, the second pressure sensor, the temperature sensor, and the control handle, enabling logical control of each solenoid valve. It also includes an operation display unit for setting control parameters, displaying component operating status and parameters, and showing alarm and fault information. A control handle is provided for inputting control signals.

[0040] This invention achieves automatic control of hydraulic oil air circulation pressure and flow rate through a throttle valve set in the hydraulic valve group, ensuring that the temperature and viscosity of hydraulic oil in the supply and return oil pipelines and hydraulic station are maintained within the ideal range, thereby improving the system's response speed in low-temperature environments.

[0041] This invention achieves rapid feedback of the load-sensitive system's feedback pressure through the automatic control of the electro-proportional pressure reducing valve installed in the hydraulic station, thereby enabling rapid control of the load-sensitive hydraulic pump and rapid response of the hydraulic pump's output pressure and flow rate.

[0042] The working process of the fast-response load-sensitive system of the present invention is as follows:

[0043] 1. The specific process for hydraulic oil temperature control is as follows:

[0044] When the equipment is in standby mode in a low-temperature environment, the electronic control system controls the opening of the electro-proportional throttle valve 8. The hydraulic oil output from the P port of the hydraulic station returns to the hydraulic station oil tank through the supply line 14, the electro-proportional throttle valve 8, and the return line 15. Because the hydraulic oil circulates continuously, the temperature of the hydraulic oil in the supply and return lines is basically the same as the temperature of the hydraulic oil in the tank, and the viscosity and flow properties of the hydraulic oil are largely unaffected by the low-temperature environment. Simultaneously, the electronic control system 4 monitors the hydraulic station oil temperature through the temperature sensor 11 and adjusts the opening of the electro-proportional throttle valve 8 according to the hydraulic station oil temperature, thereby regulating the heat generated by the throttle valve and ensuring that the hydraulic oil temperature in the tank remains within the ideal temperature range.

[0045] When the actuator needs to work, the electrical control system controls the proportional throttle valve 8 to close or reduce the valve opening to avoid affecting the actuator's operation.

[0046] 2. Load-sensitive control has two feedback and control methods. The specific control flow of the fast feedback control method is as follows:

[0047] When the actuator needs to work, the electronic control system 4 controls the solenoid directional valve 6 to switch, sealing the pressure feedback hydraulic channel and increasing the pressure rise rate of the load-sensitive multi-way valve 7. Simultaneously, it controls the load-sensitive multi-way valve 7 to open the corresponding opening. The load-sensitive multi-way valve 7 feeds back the actuator load pressure to its LS port through its internal oil passage. The LS port is equipped with a first pressure sensor 5-1, which feeds back the load pressure to the electronic control system control unit in the form of an electrical signal. The control unit adjusts the output pressure of the hydraulic station's electro-proportional pressure reducing valve 10 according to the load pressure. The output hydraulic oil passes through the shuttle valve 9 and connects to the load feedback port of the load-sensitive hydraulic pump 12, thereby controlling the output pressure of the load-sensitive hydraulic pump 12. The second pressure sensor 5-2, located at the P port of the hydraulic station, also feeds back the output pressure of the load-sensitive hydraulic pump 12 to the electronic control system control unit in the form of an electrical signal. The control unit compares the pressure difference between sensors 5-1 and 5-2 and adjusts the hydraulic station's electro-proportional pressure reducing valve 10 in real time to ensure that the difference between the output pressure of the load-sensitive hydraulic pump 12 and the load pressure is within a preset ideal range.

[0048] 3. When the fast feedback control method cannot work properly due to a fault in the electronic control system or the electro-proportional pressure reducing valve 10, the present invention adopts the traditional load-sensitive feedback control method for control. The specific control process is as follows:

[0049] When the actuator needs to work, the electronic control system 4 controls the solenoid directional valve 6 to remain stationary. The electronic control system 4 then manually or manually controls the load-sensitive multi-way valve 7 to open the corresponding opening. The load-sensitive multi-way valve 7 feeds back the actuator load pressure to its LS port through its internal oil passage. The hydraulic oil output from the LS port passes through the solenoid directional valve 6, the pressure feedback pipeline 13, and the shuttle valve 9 before being connected to the load feedback port X of the load-sensitive hydraulic pump 12. This controls the output pressure of the load-sensitive hydraulic pump 12, ensuring that the difference between the output pressure and the load pressure of the load-sensitive hydraulic pump 12 is within a preset ideal range.

Claims

1. A fast response load sensing system, characterized by, The hydraulic station (1) is jointly connected with the hydraulic valve group (2) through the pressure feedback pipeline (13), the oil supply pipeline (14), the oil return pipeline (15) and the oil discharge pipeline (16) respectively, the hydraulic valve group (2) is connected with the actuator (3) through the control pipeline (17), and the hydraulic station (1) and the hydraulic valve group (2) are also jointly connected with the electric control system (4) through a cable; The hydraulic station (1) comprises a load-sensitive hydraulic pump group (12), the oil inlet of the electric proportional pressure reducing valve (10) is connected with the oil supply port P of the load-sensitive hydraulic pump group (12), the outlet of the electric proportional pressure reducing valve (10) is also connected with the shuttle valve (9), the shuttle valve (9) is also connected with the feedback port X of the load-sensitive hydraulic pump group (12), the shuttle valve (9) is also connected with the pressure feedback pipeline (13), the oil return port of the electric proportional pressure reducing valve (10) is connected with the oil return pipeline (15), and the oil supply port P of the load-sensitive hydraulic pump group (12) is also connected with the second pressure sensor (5-2); the oil supply port P of the load-sensitive hydraulic pump group (12) is also connected with the oil supply pipeline (14). The hydraulic station (1) further comprises an oil tank (18), the oil tank (18) is provided with a hydraulic oil temperature sensor (11), the oil suction port of the load-sensitive hydraulic pump group (12) is connected with the oil tank (18), the oil discharge port of the load-sensitive hydraulic pump group (12) is connected with the oil tank (18) through the pump group oil discharge pipeline (19), and the oil tank (18) is also connected with the oil return pipeline (15). The oil suction filter (20) is further connected between the oil suction port of the load-sensitive hydraulic pump group (12) and the oil tank (18), and the oil return filter (21) is further connected between the oil tank (18) and the oil return pipeline (15). The hydraulic valve group (2) comprises a load-sensitive multi-way directional valve group (7), the oil inlet of the electromagnetic directional valve (6) is connected with the LS port of the load-sensitive multi-way directional valve group (7), the outlet of the electromagnetic directional valve (6) is connected with the shuttle valve (9) through the pressure feedback pipeline (13), the first pressure sensor (5-1) is further connected between the LS port of the load-sensitive multi-way directional valve group (7) and the oil inlet of the electromagnetic directional valve (6), the oil inlet of the electric proportional throttle valve (8) is connected with the P1 port of the load-sensitive multi-way directional valve group (7), the outlet of the electric proportional throttle valve (8) is connected with the oil return pipeline (15), the working ports A1, B1, A2 and B2 of the load-sensitive multi-way directional valve group (7) are connected with the actuator (3) through the control pipeline (17) respectively, the P port of the load-sensitive multi-way directional valve group (7) is connected with the oil supply port P of the load-sensitive hydraulic pump group (12) through the oil supply pipeline (14), the R port of the load-sensitive multi-way directional valve group (7) is connected with the oil return filter (21) through the oil return pipeline (15), and the T port of the load-sensitive multi-way directional valve group (7) is also connected with the oil tank (18) through the oil discharge pipeline (16).

2. A fast responding load sensing system according to claim 1, characterized in that The electric control system (4) comprises a control unit (4-1), the control unit (4-1) is respectively electrically connected with an operation display unit (26), a control switch (27) and a control handle (28) through cables, and the control unit (4-1) is also connected with an electromagnetic reversing valve (6), a load-sensitive multi-way reversing valve group (7), an electric proportional throttle valve (8), an electric proportional pressure reducing valve (10), a first pressure sensor (5-1), a second pressure sensor (5-2) and a hydraulic oil temperature sensor (11) through cables.

3. A fast responding load sensing system according to claim 2, wherein, The electromagnetic reversing valve (6) is a two-position two-way valve.

4. A fast responding load sensing system according to claim 2, wherein, The control unit (4-1) comprises a PLC controller (23), the PLC controller (23) is electrically connected with a power module (22), a proportional amplifier (24) and a wiring terminal (25) through cables, the proportional amplifier (24) is also electrically connected with the wiring terminal (25) through a cable, the operation display unit (26) is electrically connected with the PLC controller (23) and the power module (22) through cables, the control switch (27) and the control handle (28) are connected with the PLC controller (23) through cables, and the electromagnetic reversing valve (6), the load-sensitive multi-way reversing valve group (7), the electric proportional throttle valve (8), the electric proportional pressure reducing valve (10), the first pressure sensor (5-1), the second pressure sensor (5-2) and the hydraulic oil temperature sensor (11) are electrically connected with the wiring terminal (25) through cables.

5. The fast responding load sensing system of claim 1, wherein, The electric proportional pressure reducing valve (10) is a three-way pressure reducing valve.

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