An automated lift control system for a pressurized apparatus and methods of use thereof

Abstract

The application discloses an automatic lifting control system for a pressurized equipment and a use method thereof, wherein the automatic lifting control system for the pressurized equipment is simultaneously connected with a structure of two control modes of a manual reversing valve and an electromagnetic reversing valve, and a pilot reversing valve group is operated to determine whether a manual mode or an electric control mode is adopted, so that a safety risk hidden danger problem that an operator of a conventional pressurized operation equipment needs to be concentrated on an operation above a well mouth is solved, when a person is inconvenient to control on site, remote automatic operation can be realized, the automatic degree of equipment operation is improved, the safety status of pressurized operation is improved, potential risks are reduced, the essential safety level of equipment is improved, and local high-position worktable emergency operation can also be realized.

Description

Technical Field

[0001] This invention relates to the field of automated control technology for oil and gas well tubing. More specifically, this invention relates to a lifting control system for automated live equipment. Background Technology

[0002] Traditional live-line working equipment lifting systems employ a fully hydraulic, manually controlled approach, with hydraulic valves integrated into the wellhead operating platform. During on-site operations, operators manually operate the main valve and pilot valve of the lifting system to control the reciprocating motion of four lifting cylinders, which in turn drive the hydraulic rotary table, traveling slips, and rotating slips, working in conjunction with the fixed slips to complete the raising, lowering, and rotating of the live-line tubing at the bottom of the well. Because live-line working operations are often located in high-pressure, ultra-high-pressure, and sulfur-containing well areas, traditional live-line operations require 3-4 operators concentrated on the operating platform above the wellhead, posing significant safety hazards. Summary of the Invention

[0003] One object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages that will be described later.

[0004] Another objective of this invention is to provide an automated lifting control system for live-line equipment and its usage method, in order to solve the technical problem that the existing technology for traditional live-line lifting systems can only adopt a fully hydraulic manual control method, which results in high safety risks.

[0005] To achieve these and other advantages according to the present invention, an automated lifting control system for pressurized equipment is provided, comprising a solenoid directional valve, a manual directional valve, a pilot directional valve assembly, a differential valve, a main valve, a lifting cylinder, and a hydraulic pump, wherein the pilot directional valve assembly is provided with an oil port P. X0 Oil port P X1 Oil port P X2 The manual directional valve has a working port A. S Working oil port B S Oil inlet P S Oil return port T S The electromagnetic directional valve has a working port A. D Working oil port B D Oil inlet P D Oil return port T D The differential valve has a working port A C Working oil port B C Oil inlet P C The main valve has a differential pilot port, a lowering pilot port, a pilot oil supply port, a lifting pilot port, a return oil port T, an oil inlet port, and a pair of working oil ports. The pair of working oil ports of the main valve are respectively connected to the upper chamber and the lower chamber of the lifting cylinder, and the oil inlet port of the main valve is connected to the hydraulic pump.

[0006] Oil inlet PX0 Connected to the pilot oil supply port, oil inlet P X1 With oil inlet P S Connected, oil inlet P X2 With oil inlet P D Connected, working oil port A C Connected to the differential pilot port, working oil port B C Connected to the descent pilot port, oil inlet P C respectively with working oil port B S Working oil port B D Connected, working oil port A S Working oil port A D Connected to the lifting pilot port and the return oil port T respectively. S Oil return port T D The return oil port T is connected to the oil tank respectively;

[0007] The differential valve includes a differential directional valve, a first check valve, and a second check valve. The differential directional valve is a two-position three-way solenoid directional valve with a working port C. A Working oil port C B Oil inlet C P The first check valve has an open port D1 and a closed port J1, the second check valve has an open port D2 and a closed port J2, and the oil inlet C... P The conduction port D1 is connected to the oil inlet P respectively. C Connected, working oil port C A Connected to the cut-off port J2, and connected to the working oil port A via the on port D2. C Connected, working oil port C B The cut-off port J1 is connected to the working oil port B respectively. C Connected.

[0008] Preferably, it further includes a first one-way throttle valve and a second one-way throttle valve, the first one-way throttle valve having a throttle port P. 11 and conduction port P 12 Throttling port P 11 With the oil inlet P C Connected, conduction port P 12 Each with the working oil port B S The working oil port B D Connected, the second one-way throttle valve has a throttle port P 21 and conduction port P 22 Throttling port P 21 Connected to the lifting pilot port, the conduction port P 22 Each with the working oil port A S The working oil port A D Connected.

[0009] Preferably, a first pressure sensor is provided on the connection passage between the upper chamber of the lifting cylinder and the working port of the main valve to detect the pressure in the upper chamber of the lifting cylinder, and a second pressure sensor is provided on the connection passage between the lower chamber of the lifting cylinder and the working port of the main valve to detect the pressure in the lower chamber of the lifting cylinder. A weight indicator is provided between the first and second pressure sensors to measure and display the pressure difference between the first and second pressure sensors.

[0010] Preferably, the pilot-operated directional valve assembly includes a first pilot-operated directional valve and a second pilot-operated directional valve, both of which are two-position four-way solenoid directional valves. The first pilot-operated directional valve has a working port A. X1 Working oil port B X1 Oil inlet P 1X Oil return port T 1X The second pilot directional valve has a working port A. X2 Working oil port B X2 Oil inlet P 2X Oil return port T 2X Oil inlet P 1X Oil inlet P 2X Each with the oil inlet P X0 Connected, working oil port A X1 Working oil port A X2 Each with the oil inlet P X1 Connected, working oil port B X1 Working oil port B X2 Each with the oil inlet P X2 Connected.

[0011] This invention also provides a method for using an automated lifting control system for pressurized equipment. The system employs both manual and electronic control to control the lifting state of the lifting cylinder. When the pilot directional valve assembly is de-energized, hydraulic oil from the pilot supply port of the main valve passes directly to the manual directional valve via the pilot directional valve assembly. At this time, the manual directional valve controls the hydraulic oil to switch between the lowering and lifting pilot ports of the main valve, thereby controlling the lowering and lifting of the lifting cylinder, and ensuring the oil inlet P... S Oil return port T S Similarly, when the handle of the manual directional valve is in the neutral position, the main valve is unloaded;

[0012] When lifting is controlled electronically, the solenoid directional valve is energized to switch directions. At this time, the first and second pilot directional valves of the pilot directional valve group are simultaneously energized and switch directions, and the hydraulic oil from the pilot supply port of the main valve is switched to the inlet port P of the solenoid directional valve. DThe solenoid reversing valve is energized to control the hydraulic oil to enter the lowering pilot port or the lifting pilot port of the main valve for reversal, so as to control the lowering and lifting of the lifting cylinder.

[0013] Preferably, during use, the first one-way throttle valve and the second one-way throttle valve are adjusted to prevent the main valve from starting too quickly during heavy lifting or lowering, which could cause the lifting cylinder to move rapidly and pose a risk. During normal operation, the differential valve's inlet P... C With working oil port B C When connected, or when energized or manually adjusted to the differential position, the working port A of the differential valve... C With oil inlet P C The connection controls the differential operation of the main valve, thereby increasing the lifting speed of the lifting cylinder.

[0014] Preferably, a floating anti-overhead slip and a floating load-bearing slip are arranged sequentially from top to bottom on the upper side of the lifting cylinder of the automated live-line equipment, and a fixed anti-overhead slip and a fixed load-bearing slip are arranged sequentially from top to bottom on the lower side of the lifting cylinder of the automated live-line equipment. The lifting control system for the automated live-line equipment also includes a safety interlock module for logically interlocking the opening and closing states of the slips with the lifting conditions of the lifting cylinder. The safety interlock module includes logical interlocks between the floating load-bearing slip and the fixed load-bearing slip, between the floating anti-overhead slip and the fixed anti-overhead slip, between the fixed load-bearing slip and the fixed anti-overhead slip, and between the lifting control system and the slip opening and closing state detection settings.

[0015] When determining whether the lifting cylinder can move up or down, a safety interlock module ensures lifting safety, preventing the movable load-bearing slip and the fixed load-bearing slip from being simultaneously open, and preventing the movable anti-overturning slip and the fixed anti-overturning slip from being simultaneously open. When either the fixed anti-overturning slip or the fixed load-bearing slip is in the closed state, the lifting cylinder cannot move down; when either the movable anti-overturning slip or the movable load-bearing slip is in the closed state, the lifting cylinder cannot move up.

[0016] Preferably, a dual-line flow transmitter is installed on the main oil line of the rodless chamber of the hydraulic cylinder for the movable anti-jacking slip, the movable load-bearing slip, the fixed anti-jacking slip, and the fixed load-bearing slip, respectively, to detect whether the corresponding slip is in the correct position.

[0017] Preferably, a spare fixed anti-jacking slip is provided on the lower side of the lifting cylinder and the upper side of the fixed anti-jacking slip. When the dual-line flow transmitter corresponding to the fixed load-bearing slip detects that it is in an abnormal open state, the spare fixed anti-jacking slip is used to clamp the pipe column.

[0018] The present invention has at least the following beneficial effects: By setting up an automated lifting control system for live-line equipment, the present invention incorporates a structure that connects both manual and electromagnetic directional valves for control. By operating the pilot directional valve group, the system determines whether to use manual or electronic control for directional operation, thereby controlling the lifting and lowering actions of the lifting system cylinders. This solves the safety risk problem of conventional live-line equipment requiring operators to be concentrated above the wellhead for operation. Thus, when it is inconvenient for personnel to control the equipment on-site, remote automated operation can be achieved, improving the automation level of equipment operation, improving the safety status of live-line operations, reducing potential risks, and enhancing the inherent safety level of the equipment. At the same time, it also enables emergency operation from a local high-level work platform.

[0019] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0020] Figure 1 This is a system connection schematic diagram of the lifting control system for automated live-line equipment according to the present invention;

[0021] Figure 2 This is a system schematic diagram of the present invention when setting up movable anti-top clamps, movable load-bearing clamps, fixed anti-top clamps, fixed load-bearing clamps, and spare fixed anti-top clamps. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0023] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] like Figure 1 As shown, this invention provides an automated lifting control system for pressurized equipment, including a solenoid directional valve, a manual directional valve, a pilot directional valve assembly, a differential valve, a main valve, a lifting cylinder, and a hydraulic pump. The pilot directional valve assembly is provided with an oil port P. X0 Oil port P X1 Oil port PX2 The manual directional valve has a working port A. S Working oil port B S Oil inlet P S Oil return port T S The electromagnetic directional valve has a working port A. D Working oil port B D Oil inlet P D Oil return port T D The differential valve has a working port A C Working oil port B C Oil inlet P C The main valve has a differential pilot port, a lowering pilot port, a pilot oil supply port, a lifting pilot port, a return oil port T, an oil inlet port, and a pair of working oil ports. The pair of working oil ports of the main valve are respectively connected to the upper chamber and the lower chamber of the lifting cylinder, and the oil inlet port of the main valve is connected to the hydraulic pump.

[0025] Oil inlet P X0 Connected to the pilot oil supply port, oil inlet P X1 With oil inlet P S Connected, oil inlet P X2 With oil inlet P D Connected, working oil port A C Connected to the differential pilot port, working oil port B C Connected to the descent pilot port, oil inlet P C respectively with working oil port B S Working oil port B D Connected, working oil port A S Working oil port A D Connected to the lifting pilot port and the return oil port T respectively. S Oil return port T D The return oil port T is connected to the oil tank respectively;

[0026] The differential valve includes a differential directional valve, a first check valve, and a second check valve. The differential directional valve is a two-position three-way solenoid directional valve with a working port C. A Working oil port C B Oil inlet C P The first check valve has an open port D1 and a closed port J1, the second check valve has an open port D2 and a closed port J2, and the oil inlet C... P The conduction port D1 is connected to the oil inlet P respectively. C Connected, working oil port C A Connected to the cut-off port J2, and connected to the working oil port A via the on port D2. C Connected, working oil port C B The cut-off port J1 is connected to the working oil port B respectively. C Connected.

[0027] A pilot-operated directional valve assembly is provided to connect the hydraulic circuit to the solenoid directional valve or the manual directional valve as needed. This allows the lifting or lowering hydraulic circuit switching operation of the lifting cylinder in the lifting system to be independently controlled by either the solenoid or manual directional valve. When the solenoid directional valve is used for control, hydraulic oil is drawn from the hydraulic pump, flows out from the pilot supply port, and enters port P of the pilot directional valve assembly. X0 Then from the oil port P X2 Oil inlet P of the solenoid directional valve D Switch to working port B via electromagnetic reversing valve D With oil inlet P C When the differential valve is in operation and the circuit is open, the oil inlet P... C With working oil port B C When the circuit is open, hydraulic oil flows sequentially through the working port B of the solenoid directional valve. D Oil inlet P C Working oil port B C The main valve's lowering pilot port enters the lifting cylinder, driving it to retract and lower; the working port A is switched via the solenoid directional valve. D When the hydraulic oil is connected to the lifting pilot port, it enters the lifting cylinder and drives it to perform the lifting operation. When the differential valve is energized or manually adjusted to the differential position, the working port C... A Oil inlet C P The differential control of the main valve increases the lifting speed of the lifting cylinder.

[0028] When controlled by a manual directional valve, the oil port P of the pilot directional valve assembly enters the pilot directional valve assembly. X0 Then from the oil port P X1 The oil inlet Ps of the manual directional valve functions similarly to the solenoid directional valve, and is manually switched to the working oil inlet A. S Then the lifting pilot port of the main valve is opened, and it is manually switched to the working oil port B. S If the main valve is opened, the pilot port for lowering will be activated, and the differential valve will still function to control the differential movement of the main valve, thereby accelerating the lifting of the lifting cylinder.

[0029] The automated live-line equipment lifting control system of this invention incorporates both manual and electromagnetic directional valves for control. By operating the pilot directional valve group, the system determines whether to use manual or electronic control. This solves the safety risks associated with conventional live-line equipment requiring operators to be concentrated above the wellhead. It enables remote automated operation when on-site control is inconvenient, improving the automation level of equipment operation, enhancing the safety of live-line work, reducing potential risks, and increasing the inherent safety level of the equipment. It also allows for emergency operation from a local high-level work platform.

[0030] In another technical solution, such as Figure 1 As shown, it also includes a first one-way throttle valve and a second one-way throttle valve, the first one-way throttle valve having a throttle port P. 11 and conduction port P 12 Throttling port P 11 With the oil inlet P C Connected, conduction port P 12 Each with the working oil port B S The working oil port B D Connected, the second one-way throttle valve has a throttle port P 21 and conduction port P 22 Throttling port P 21 Connected to the lifting pilot port, the conduction port P 22 Each with the working oil port A S The working oil port A D Connected.

[0031] By setting a first one-way throttle valve and a second one-way throttle valve on the lifting pilot port and lowering pilot port paths of the main valve respectively, the risk of the lifting cylinder moving too quickly due to the main valve starting too quickly during heavy lifting or lowering is prevented.

[0032] In another technical solution, such as Figure 1 As shown, a first pressure sensor is installed on the connection passage between the upper chamber of the lifting cylinder and the working port of the main valve to detect the pressure in the upper chamber of the lifting cylinder. A second pressure sensor is installed on the connection passage between the lower chamber of the lifting cylinder and the working port of the main valve to detect the pressure in the lower chamber of the lifting cylinder. A weight indicator is installed between the first and second pressure sensors to measure and display the pressure difference between the first and second pressure sensors.

[0033] The pressure in the upper and lower chambers of the lifting cylinder is detected by setting a first pressure sensor and a second pressure sensor. The pressure difference is calculated by the system and displayed in the weight indicator in the form of "lighter pipe" or "heavier pipe".

[0034] In another technical solution, such as Figure 1 As shown, the pilot-operated directional valve assembly includes a first pilot-operated directional valve and a second pilot-operated directional valve. Both the first and second pilot-operated directional valves are two-position four-way solenoid directional valves. The first pilot-operated directional valve has a working port A. X1 Working oil port B X1 Oil inlet P 1X Oil return port T 1X The second pilot directional valve has a working port A. X2 Working oil port B X2 Oil inlet P 2X Oil return port T2X Oil inlet P 1X Oil inlet P 2X Each with the oil inlet P X0 Connected, working oil port A X1 Working oil port A X2 Each with the oil inlet P X1 Connected, working oil port B X1 Working oil port B X2 Each with the oil inlet P X2 Connected. The pilot-operated directional valve assembly consists of two 2-position 4-way solenoid directional valves, which respectively control the oil circuit connection with the solenoid directional valve and the manual directional valve.

[0035] This invention also provides a method for using a lifting control system for automated live-line equipment, such as... Figure 1 As shown, the system uses both manual and electronic control to control the lifting state of the lifting cylinder. When the pilot directional valve assembly is not energized, the hydraulic oil from the pilot supply port of the main valve passes through the pilot directional valve assembly directly to the manual directional valve. At this time, the manual directional valve controls the hydraulic oil to switch between the lowering pilot port and the lifting pilot port of the main valve to control the lowering and lifting of the lifting cylinder, thus controlling the lowering and lifting of the lifting cylinder. S Oil return port T S Similarly, when the handle of the manual directional valve is in the neutral position, the main valve is unloaded;

[0036] When lifting is controlled electronically, the solenoid directional valve is energized to switch directions. At this time, the first and second pilot directional valves of the pilot directional valve group are simultaneously energized and switch directions, and the hydraulic oil from the pilot supply port of the main valve is switched to the inlet port P of the solenoid directional valve. D The solenoid reversing valve is energized to control the hydraulic oil to enter the lowering pilot port or the lifting pilot port of the main valve for reversal, so as to control the lowering and lifting of the lifting cylinder.

[0037] The method of use in this embodiment includes automatic and manual control of the lifting or lowering column of the lifting cylinder of the pressurized equipment. The control system can automatically control the main valve and other reversing operations after the electromagnetic reversing valve is energized, or the main valve and other reversing operations can be directly controlled by the manual reversing valve, thereby completing the lifting and lowering actions of the lifting system cylinder, realizing remote automated operation, and improving the safety of operation.

[0038] In another technical solution, such as Figure 1 As shown, during use, the first one-way throttle valve and the second one-way throttle valve are adjusted to prevent the main valve from starting too quickly during heavy lifting or lowering, which could cause the lifting cylinder to move rapidly and create a risk. During normal operation, the differential valve's inlet P...C With working oil port B C When connected, or when energized or manually adjusted to the differential position, the working port A of the differential valve... C With oil inlet P C The connection controls the differential operation of the main valve, thereby increasing the lifting speed of the lifting cylinder.

[0039] In another technical solution, such as Figure 1-2 As shown, on the upper side of the lifting cylinder of the automated live-line equipment, from top to bottom, there are floating anti-overhead slips and floating load-bearing slips, and on the lower side of the lifting cylinder of the automated live-line equipment, from top to bottom, there are fixed anti-overhead slips and fixed load-bearing slips, respectively. The lifting control system for the automated live-line equipment also includes a safety interlock module, which is used to logically interlock the opening and closing status of the slips with the lifting condition of the lifting cylinder. The safety interlock module includes a logical interlock between the floating load-bearing slips and the fixed load-bearing slips, a logical interlock between the floating anti-overhead slips and the fixed anti-overhead slips, a logical interlock between the fixed load-bearing slips and the fixed anti-overhead slips, and a logical interlock between the lifting control system and the slip opening and closing status detection setting.

[0040] When determining whether the lifting cylinder can move upward or downward, a safety interlock module ensures lifting safety, preventing the movable load-bearing slip and the fixed load-bearing slip from being simultaneously open, the movable anti-overhead slip and the fixed anti-overhead slip from being simultaneously open, and the fixed load-bearing slip and the fixed anti-overhead slip from being simultaneously open. When either the fixed anti-overhead slip or the fixed load-bearing slip is closed, the lifting cylinder cannot move downward; when either the movable anti-overhead slip or the movable load-bearing slip is closed, the lifting cylinder cannot move upward.

[0041] During the lifting process of the hoisting cylinder in the lifting system, operational errors such as improper clamping of the slips, incorrect opening of the anti-overhead slips or load-bearing slips of the live working equipment, or slip dulling can all lead to the live working equipment failing to properly clamp the downhole tubing, resulting in tubing ejection or falling into the well. Therefore, a safety interlock module is installed to enhance the safety of the equipment and operators by interlocking the slip opening / closing status with the lifting operation. The slips of the live working equipment are divided into movable load-bearing slips and fixed load-bearing slips, as well as movable anti-overhead slips and fixed anti-overhead slips. During operation, the choice between movable and load-bearing slips depends on whether the tubing is light or heavy. The ability to raise or lower the lifting system is determined by checking the opening / closing status of each slip. Taking the working load state of the tubing column as an example, both the fixed anti-overhead slip and the traveling anti-overhead slip are in the open position. When the lifting cylinder needs to move upward, it must ensure that the fixed load-bearing slip is in the closed position and the traveling load-bearing slip is in the open position. When the lifting cylinder needs to move downward, it must ensure that the fixed load-bearing slip is in the open position and the traveling load-bearing slip is in the closed position. The lifting control system and the slip switch status detection are interlocked. When either the fixed anti-overhead slip or the fixed load-bearing slip is in the closed position, the lifting cylinder cannot move downward. When either the traveling anti-overhead slip or the traveling load-bearing slip is in the closed position, the lifting cylinder cannot move upward.

[0042] In another technical solution, such as Figure 2 As shown, dual-line flow transmitters are installed in the main oil circuit of the rodless chamber of the cylinder for the movable anti-top slip, movable load-bearing slip, fixed anti-top slip, and fixed load-bearing slip, respectively, to detect whether the corresponding slip is in the correct position.

[0043] A dual-line flow transmitter is added to the main oil circuit of the rodless chamber of the slip cylinder to detect whether the slip is fully open or closed. When the slip is working, the instantaneous flow value of the flow transmitter is converted into a pulse signal and transmitted to the system. The system determines whether the slip is fully open or closed based on the theoretically calculated number of pulses required for the slip to be fully open, fully closed, or partially open and partially closed.

[0044] In another technical solution, such as Figure 2 As shown, a spare fixed anti-top slip is provided on the lower side of the lifting cylinder and the upper side of the fixed anti-top slip to further ensure system safety. When the dual-line flow transmitter corresponding to the fixed load-bearing slip detects that it is in an abnormal open state, the spare fixed anti-top slip will clamp the pipe column.

[0045] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A lifting control system for automated live-line equipment, characterized in that, It includes a solenoid directional valve, a manual directional valve, a pilot directional valve assembly, a differential valve, a main valve, a lifting cylinder, and a hydraulic pump. The pilot directional valve assembly is equipped with an oil port P. X0 Oil port P X1 Oil port P X2 The manual directional valve has a working port A. S Working oil port B S Oil inlet P S Oil return port T S The electromagnetic directional valve has a working port A. D Working oil port B D Oil inlet P D Oil return port T D The differential valve has a working port A C Working oil port B C Oil inlet P C The main valve has a differential pilot port, a lowering pilot port, a pilot oil supply port, a lifting pilot port, a return oil port T, an oil inlet port, and a pair of working oil ports. The pair of working oil ports of the main valve are respectively connected to the upper chamber and the lower chamber of the lifting cylinder, and the oil inlet port of the main valve is connected to the hydraulic pump. Oil inlet P X0 Connected to the pilot oil supply port, oil inlet P X1 With oil inlet P S Connected, oil inlet P X2 With oil inlet P D Connected, working oil port A C Connected to the differential pilot port, working oil port B C Connected to the descent pilot port, oil inlet P C respectively with working oil port B S Working oil port B D Connected, working oil port A S Working oil port A D Connected to the lifting pilot port and the return oil port T respectively. S Oil return port T D The return oil port T is connected to the oil tank respectively; The differential valve includes a differential directional valve, a first check valve, and a second check valve. The differential directional valve is a two-position three-way solenoid directional valve with a working port C. A Working oil port C B Oil inlet C P The first check valve has an open port D1 and a closed port J1, the second check valve has an open port D2 and a closed port J2, and the oil inlet C... P The conduction port D1 is connected to the oil inlet P respectively. C Connected, working oil port C A Connected to the cut-off port J2, and connected to the working oil port A via the on port D2. C Connected, working oil port C B The cut-off port J1 is connected to the working oil port B respectively. C Connected.

2. The lifting control system for automated live-line equipment as described in claim 1, characterized in that, It also includes a first one-way throttle valve and a second one-way throttle valve, the first one-way throttle valve having a throttle port P. 11 and conduction port P 12 Throttling port P 11 With the oil inlet P C Connected, conduction port P 12 Each with the working oil port B S The working oil port B D Connected, the second one-way throttle valve has a throttle port P 21 and conduction port P 22 Throttling port P 21 Connected to the lifting pilot port, the conduction port P 22 Each with the working oil port A S The working oil port A D Connected.

3. The lifting control system for automated live-line equipment as described in claim 2, characterized in that, A first pressure sensor is installed on the connection passage between the upper chamber of the lifting cylinder and the working port of the main valve to detect the pressure in the upper chamber of the lifting cylinder. A second pressure sensor is installed on the connection passage between the lower chamber of the lifting cylinder and the working port of the main valve to detect the pressure in the lower chamber of the lifting cylinder. A weight indicator is installed between the first and second pressure sensors to measure and display the pressure difference between the first and second pressure sensors.

4. The automated live-line lifting control system for pressurized equipment as described in claim 3, characterized in that, The pilot-operated directional valve assembly includes a first pilot-operated directional valve and a second pilot-operated directional valve. Both the first and second pilot-operated directional valves are two-position four-way solenoid directional valves. The first pilot-operated directional valve has a working port A. X1 Working oil port B X1 Oil inlet P 1X Oil return port T 1X The second pilot directional valve has a working port A. X2 Working oil port B X2 Oil inlet P 2X Oil return port T 2X Oil inlet P 1X Oil inlet P 2X Each is connected to the oil inlet P X0 Connected, working oil port A X1 Working oil port A X2 Each is connected to the oil inlet P X1 Connected, working oil port B X1 Working oil port B X2 Each is connected to the oil inlet P X2 Connected.

5. The method of using the automated live-line equipment lifting control system as described in claim 4, characterized in that, The system employs both manual and electronic control to regulate the lifting state of the hoisting cylinder. When the pilot directional valve assembly is de-energized, hydraulic oil from the pilot supply port of the main valve flows directly to the manual directional valve via the pilot directional valve assembly. The manual directional valve then controls the hydraulic oil to switch between the lowering and lifting pilot ports of the main valve, thereby controlling the lowering and lifting of the hoisting cylinder and ensuring the oil inlet P... S Oil return port T S Similarly, when the handle of the manual directional valve is in the neutral position, the main valve is unloaded; When lifting is controlled electronically, the solenoid directional valve is energized to switch directions. At this time, the first and second pilot directional valves of the pilot directional valve group are simultaneously energized and switch directions, and the hydraulic oil from the pilot supply port of the main valve is switched to the inlet port P of the solenoid directional valve. D The solenoid reversing valve is energized to control the hydraulic oil to enter the lowering pilot port or the lifting pilot port of the main valve for reversal, so as to control the lowering and lifting of the lifting cylinder.

6. The method of using the automated live-line equipment lifting control system as described in claim 5, characterized in that, During use, the first and second one-way throttle valves are adjusted to prevent the main valve from starting too quickly during heavy lifting or lowering, which could cause the lifting cylinder to move rapidly and pose a risk. Under normal operating conditions, the differential valve's inlet P... C With working oil port B C When connected, or when energized or manually adjusted to the differential position, the working port A of the differential valve... C With oil inlet P C The connection controls the differential operation of the main valve, thereby increasing the lifting speed of the lifting cylinder.

7. The method of using the automated live-line equipment lifting control system as described in claim 6, characterized in that, On the upper side of the lifting cylinder of the automated live-line equipment, from top to bottom, there are floating anti-overhead slips and floating load-bearing slips. On the lower side of the lifting cylinder of the automated live-line equipment, from top to bottom, there are fixed anti-overhead slips and fixed load-bearing slips. The lifting control system for the automated live-line equipment also includes a safety interlock module, which is used to logically interlock the opening and closing status of the slips with the lifting condition of the lifting cylinder. The safety interlock module includes a logical interlock between the floating load-bearing slips and the fixed load-bearing slips, a logical interlock between the floating anti-overhead slips and the fixed anti-overhead slips, a logical interlock between the fixed load-bearing slips and the fixed anti-overhead slips, and a logical interlock between the lifting control system and the slip opening and closing status detection setting. When determining whether the lifting cylinder can move up or down, a safety interlock module ensures lifting safety, preventing the movable load-bearing slip and the fixed load-bearing slip from being simultaneously open, and preventing the movable anti-overturning slip and the fixed anti-overturning slip from being simultaneously open. When either the fixed anti-overturning slip or the fixed load-bearing slip is in the closed state, the lifting cylinder cannot move down; when either the movable anti-overturning slip or the movable load-bearing slip is in the closed state, the lifting cylinder cannot move up.

8. The method of using the automated live-line equipment lifting control system as described in claim 7, characterized in that, Dual-line flow transmitters are installed in the main oil circuit of the rodless chamber of the hydraulic cylinder for the movable anti-top slip, movable load-bearing slip, fixed anti-top slip, and fixed load-bearing slip to detect whether the corresponding slip is in the correct position.

9. The method of using the automated live-line equipment lifting control system as described in claim 8, characterized in that, A spare fixed anti-top slip is provided on the lower side of the lifting cylinder and the upper side of the fixed anti-top slip. When the dual-line flow transmitter corresponding to the fixed load-bearing slip detects that it is in an abnormal open state, the spare fixed anti-top slip is used to clamp the pipe column.

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