Mud emergency treatment system and method for electrically driving cementing truck

Abstract

This invention discloses an emergency mud treatment system for electric cementing trucks, including a power switching valve assembly. The actuator end of the power switching valve assembly is connected to a centrifugal pump drive motor and a speed control valve. The power source port of the power switching valve assembly is connected to an emergency hydraulic pump assembly and a motor-driven hydraulic pump assembly. The emergency hydraulic pump assembly is connected to an emergency power system. The outlet end of the speed control valve is connected to a stirring motor, and the outlet of the stirring motor is connected to a hydraulic oil tank. This invention also discloses an emergency treatment method for the emergency mud treatment system for electric cementing trucks. This invention solves the problem of mud not being discharged from the mixing tank during power supply failures in current electric cementing trucks, reducing the risk of equipment and property damage caused by mud solidification and improving equipment safety and reliability. Utilizing a highly integrated power switching valve assembly, it achieves power switching of the equipment's hydraulic power source in emergency situations. The pipeline is simple, occupies little space, achieves intelligent emergency mud treatment, has a simple structure, and low manufacturing cost.

Description

Technical Field

[0001] This invention belongs to the technical field of oil and gas field development systems, specifically relating to an emergency mud treatment system for electric cementing trucks, and also to an emergency treatment method for the system. Background Technology

[0002] Cementing trucks are mainly used for cementing operations during the drilling process. Their function is to mix cement slurry and pump it into the annulus space between the wellbore and the casing. After solidification, it achieves the purposes of reinforcing the wellbore, supporting the casing, and sealing off oil, gas, and water layers. Traditional cementing trucks mostly use an internal combustion engine chassis with cementing equipment mounted on it. The internal combustion engine chassis engine drives the hydraulic system and mud pump. The hydraulic system provides power for conveying clean water, mixing mud, secondary mixing mud, injecting mud, and pumping mud to the bottom of the well. Its main components include a high-energy mixer, mixing tank, water tank, clean water pipeline, mud pipeline, secondary mixing pipeline, mud pump, centrifugal pump, hydraulic system, lubrication system, control system, and internal combustion engine chassis. The cementing truck's workflow can be briefly summarized as follows: A centrifugal pump draws clean water from a tank and pumps it through a clean water pipeline to a high-energy mixer. There, it is pre-mixed with cement ash supplied from the external ash supply equipment and then falls into a mixing tank. Inside the mixing tank, impellers continue to mix the mixture thoroughly. A centrifugal pump then draws the mixed mud from the mixing tank and pumps it through a mud pipeline to a mud pump, which then injects the mud into the annulus space between the wellbore and the casing. To ensure more uniform mud mixing, a branch line of mud is routed through the mud pipeline to the mixing tank for secondary mixing.

[0003] Currently, in response to the national call to promote electric power for oil production and reduce carbon emissions, electric cementing trucks have been widely used in oil drilling operations. However, commercially available electric cementing trucks typically employ a design where the entire electric cementing equipment is mounted on an internal combustion engine chassis. Due to their high drive power (often exceeding 600kW), and the size limitations of the truck itself, there are no built-in generators or emergency power supplies. Power is often supplied from the drilling site's own power grid. Regardless of whether the well site uses grid power or its own microgrid, there is a risk of grid failure and power outages. While grid failures do not cause safety accidents in drilling operations, for cementing operations, a power outage will directly render the cementing truck unusable. If the mud stored in the internal mixing tank, high-energy mixer, secondary mixing tank, and delivery pipelines is not promptly drained and cleaned, it will solidify within a short time, causing irreversible damage to the cementing equipment and resulting in property and equipment losses. Summary of the Invention

[0004] The purpose of this invention is to provide an emergency mud treatment system for electric cementing trucks, which solves the problem of mud not being able to be discharged due to power grid failure in existing electric cementing trucks.

[0005] Another objective of this invention is to provide an emergency treatment method for an electric cementing truck mud emergency treatment system.

[0006] The technical solution adopted in this invention is an electric cementing truck mud emergency treatment system, including a power switching valve group. The actuator end of the power switching valve group is connected to a centrifugal pump drive motor and a speed control valve. The power source port of the power switching valve group is connected to an emergency hydraulic pump group and a motor-driven hydraulic pump group. The emergency hydraulic pump group is connected to an emergency power system. The outlet end of the speed control valve is connected to a stirring motor. The outlet of the stirring motor is connected to a hydraulic oil tank.

[0007] The invention is further characterized by: The inlet of the speed control valve is connected to a flow bypass valve, a pressure sensor, and a safety valve, while the outlet of the flow bypass valve is connected to a proportional directional valve assembly and a check valve.

[0008] The outlet of the proportional directional valve group is connected to the swing cylinder group, the inlet valve, and the return oil of the swing cylinder group is connected to the hydraulic oil tank after passing through the proportional directional valve.

[0009] The inlet of the check valve is connected to the motor-driven hydraulic pump unit and the safety valve.

[0010] The emergency power system includes a chassis engine, which is connected to the drive shaft of the emergency hydraulic pump unit via a coupling.

[0011] The motor-driven hydraulic pump unit includes a motor, which is connected to a transfer case. The transfer case is connected to a closed-loop variable hydraulic pump and an open-loop hydraulic pump. The closed-loop variable hydraulic pump is connected to a centrifugal pump drive motor unit.

[0012] The power switching valve assembly includes a base block, in which a first power switching valve, a second power switching valve, a third power switching valve, a fourth power switching valve, and a fifth power switching valve are respectively installed. The oil port of the base block is connected to the emergency hydraulic pump assembly and the motor-driven hydraulic pump assembly.

[0013] Another technical solution adopted in this invention is, Emergency response methods for electric cementing truck mud emergency treatment systems shall be implemented according to the following steps: Step 1, Emergency Alarm When a power outage, battery pack failure, or other situation occurs that prevents the motor from continuing to provide power to the hydraulic system, the emergency uninterruptible power supply automatically switches to the on-board battery pack to continue powering the control center. After the control center detects abnormal motor operation and hydraulic system pressure loss, it sends an action signal to the fifth power switching valve, connecting the pressure oil port of the emergency open hydraulic pump to the outlet of the fifth power switching valve; it also sends an action signal to the flow bypass valve, diverting the pressure oil from the outlet of the fifth power switching valve to the proportional directional valve group to control the movement of the swing cylinder group, and simultaneously issuing an alarm signal. Step 2: Start the emergency power system The chassis engine operates, providing power to the emergency hydraulic pump unit. When the emergency hydraulic pump unit operates, the pressure oil from the emergency open hydraulic pump enters the stirring motor through the fifth power switching valve and speed control valve, driving the stirring motor to rotate and agitate the mud remaining in the mixing tank to prevent solidification. At the same time, after the pressure sensor detects the pressure signal, the control center, based on the position detection results of the water inlet valve and ash inlet valve, gives the proportional directional valve group action signal to close the water inlet valve and ash inlet valve. Step 3: Drain the mud The control center sends an action signal to the third power switching valve and the fourth power switching valve, which connects the emergency closed variable hydraulic pump to the mud centrifugal pump drive motor. The mud centrifugal pump drive motor drives the mud centrifugal pump to discharge the mud liquid remaining in the mixing tank. Step 4: Rinse with clean water After the slurry remaining in the mixing tank is drained, the control center sends activation signals to the third and fourth power switching valves, connecting the emergency closed-loop variable hydraulic pump to the clean water centrifugal pump drive motor; it also sends activation signal to the first proportional directional valve, opening the inlet valve; the clean water centrifugal pump drive motor drives the clean water centrifugal pump to draw clean water and pump it into the mixing tank through the inlet valve. After the mixing tank is stirred and flushed by the stirring motor, the "drain slurry" option is selected again to drain the slurry water and remove the residual slurry in the slurry pipeline. Step 5: Emergency Exit When the fault is repaired and the motor-driven hydraulic pump group is working normally, the vehicle is turned off. The control center sends an action signal to the power switching valve group, disconnecting the connection between the pressure port of the emergency hydraulic pump group and the output port of the power switching valve group, and connecting the motor-driven hydraulic pump group and the output port of the power switching valve group; it also sends an action signal to the flow bypass valve, cutting off the oil circuit from the output port of the fifth power switching valve to the proportional directional valve group.

[0014] The beneficial effects of this invention are: This invention relates to an emergency mud treatment system for electric cementing trucks. It solves the problem of mud failing to drain from the mixing tank during power supply failures in current electric cementing trucks, reducing the risk of equipment and property damage caused by mud tank solidification and improving equipment safety and reliability. Utilizing a highly integrated power switching valve group, it enables power switching of the equipment's hydraulic power source in emergency situations. The system features simple pipelines, minimal space occupation, and achieves intelligent emergency mud treatment. It also boasts a simple structure and low manufacturing cost. Attached Figure Description

[0015] Figure 1 This is a hydraulic schematic diagram of the normal operating condition of the electric cementing truck mud emergency treatment system of the present invention; Figure 2 This is a simplified diagram illustrating the emergency treatment method of the electric cementing truck mud emergency treatment system of the present invention. Figure 3 This is a schematic diagram of the power switching valve group in the electric cementing truck mud emergency treatment system of the present invention; Figure 4 This is a hydraulic schematic diagram of the emergency mixing operation in the electric cementing truck mud emergency treatment system of the present invention; Figure 5 This is a hydraulic schematic diagram of the mud discharge operation in the electric-driven cementing truck mud emergency treatment system of the present invention. Figure 6 This is a hydraulic schematic diagram of the water flushing operation in the electric cementing truck mud emergency treatment system of the present invention.

[0016] In the diagram: 1. Chassis engine, 2. Emergency hydraulic pump assembly, 3. Motor-driven hydraulic pump assembly, 4. Power switching valve assembly, 5. Flow bypass valve, 6. Proportional directional valve assembly, 7. Swing cylinder assembly, 8. Agitator motor, 9. Pressure sensor, 10. Speed ​​control valve, 11. Safety valve, 12. Centrifugal pump drive motor assembly, 13. Check valve, 14. Hydraulic oil tank, 15. Control center, 16. Emergency uninterruptible power supply, 17. Onboard battery pack; 2.1. Emergency closed-loop variable hydraulic pump; 2.2. Emergency open-loop hydraulic pump; 3.1. Motor; 3.2. Closed-loop variable hydraulic pump; 3.3. Open-loop hydraulic pump; 3.4. Transfer case; 4.1. First power switching valve; 4.2. Second power switching valve; 4.3. Third power switching valve; 4.4. Fourth power switching valve; 4.5. Fifth power switching valve; 4.6. Base block; 6.1. First proportional directional valve; 6.2. Second proportional directional valve; 7.1. First swing cylinder; 7.2. Second swing cylinder; 12.1. Slurry centrifugal pump drive motor; 12.2. Clean water centrifugal pump drive motor. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0018] This invention provides an emergency mud treatment system for electric cementing trucks, such as... Figure 1-2As shown, the system includes a power switching valve assembly 4. The actuator end of the power switching valve assembly 4 is connected to a centrifugal pump drive motor assembly 12 and a speed control valve 10. The power source port of the power switching valve assembly 4 is connected to an emergency hydraulic pump assembly 2 and a motor-driven hydraulic pump assembly 3. The emergency hydraulic pump assembly 2 is connected to an emergency power system. The outlet end of the speed control valve 10 is connected to a stirring motor 8, and the outlet of the stirring motor 8 is connected to a hydraulic oil tank 14. In the figure, the thicker lines represent the working oil circuit. The control center 15 of this system is connected to all solenoid valves and is also connected to the electrical control cabinet and the emergency uninterruptible power supply 16. The power grid supplies power to the electrical control cabinet, which controls the motor. The motor serves as the power source for the hydraulic pump. When a power grid failure causes the motor to be unable to provide power to the system, the emergency uninterruptible power supply 16 automatically connects to the vehicle battery pack 17 to continue supplying power to the control center 15. The vehicle battery pack 17 can be a chassis battery or a backup battery pack for energy storage. In an emergency, the chassis engine 1 is started to provide power to the emergency hydraulic pump group 2, which drives the hydraulic motor 12.2 of the clean water centrifugal pump, the stirring motor 8 and the swing cylinder group 7 to operate, so as to discharge and clean the mud in the mixing tank, secondary mixing and conveying pipeline in time, and prevent the mud from solidifying in a short time, which would cause irreversible damage to the cementing equipment and result in property and equipment loss.

[0019] Example 1 The electric cementing truck mud emergency treatment system includes a power switching valve assembly 4. The actuator end of the power switching valve assembly 4 is connected to a centrifugal pump drive motor assembly 12 and a speed control valve 10. The power source port of the power switching valve assembly 4 is connected to an emergency hydraulic pump assembly 2 and a motor-driven hydraulic pump assembly 3. The emergency hydraulic pump assembly 2 is connected to an emergency power system. The outlet end of the speed control valve 10 is connected to a stirring motor 8, and the outlet of the stirring motor 8 is connected to a hydraulic oil tank 14. The emergency hydraulic pump assembly 2 includes an emergency closed-loop variable hydraulic pump 2.1 and an emergency open-loop hydraulic pump 2.2.

[0020] The inlet of the speed control valve 10 is connected to a flow bypass valve 5, a pressure sensor 9, and a safety valve 11. The outlet of the flow bypass valve 5 is connected to a proportional directional valve assembly 6 and a check valve 13. The speed control valve 10 is used to regulate the speed of the stirring motor 8. The speed control valve 10, flow bypass valve 5, pressure sensor 9, and safety valve 11 are all connected to the control center 15. The function of the flow bypass valve 5 is to, in emergency conditions, divert the pressure oil from the stirring motor 8's pressure oil circuit to the proportional directional valve assembly 6, control the swing cylinder assembly 7, and thus control the operation of the water inlet valve and ash inlet valve.

[0021] Example 2 The electric cementing truck mud emergency treatment system includes a power switching valve group 4. The actuator end of the power switching valve group 4 is connected to a centrifugal pump drive motor group 12 and a speed control valve 10. The power source port of the power switching valve group 4 is connected to an emergency hydraulic pump group 2 and a motor-driven hydraulic pump group 3. The emergency hydraulic pump group 2 is connected to an emergency power system. The outlet end of the speed control valve 10 is connected to a stirring motor 8. The outlet of the stirring motor 8 is connected to a hydraulic oil tank 14.

[0022] The inlet of the speed control valve 10 is connected to a flow bypass valve 5, a pressure sensor 9, and a safety valve 11. The outlet of the flow bypass valve 5 is connected to a proportional directional valve group 6 and a check valve 13.

[0023] The outlet of the proportional directional valve assembly 6 is connected to the swing cylinder assembly 7, the inlet valve, and the return oil from the swing cylinder assembly 7 is connected to the hydraulic oil tank 14 after passing through the proportional directional valve assembly 6. The proportional directional valve assembly 6 includes a first proportional directional valve 6.1 and a second proportional directional valve 6.2, and the swing cylinder assembly 7 includes a first swing cylinder 7.1 and a second swing cylinder 7.2.

[0024] Example 3 The electric cementing truck mud emergency treatment system includes a power switching valve group 4. The actuator end of the power switching valve group 4 is connected to a centrifugal pump drive motor group 12 and a speed control valve 10. The power source port of the power switching valve group 4 is connected to an emergency hydraulic pump group 2 and a motor-driven hydraulic pump group 3. The emergency hydraulic pump group 2 is connected to an emergency power system. The outlet end of the speed control valve 10 is connected to a stirring motor 8. The outlet of the stirring motor 8 is connected to a hydraulic oil tank 14.

[0025] The inlet of the speed control valve 10 is connected to a flow bypass valve 5, a pressure sensor 9, and a safety valve 11. The outlet of the flow bypass valve 5 is connected to a proportional directional valve group 6 and a check valve 13.

[0026] The outlet of the proportional directional valve assembly 6 is connected to the swing cylinder assembly 7, the inlet valve, and the return oil of the swing cylinder assembly 7 is connected to the hydraulic oil tank 14 after passing through the proportional directional valve assembly 6.

[0027] The inlet of the one-way valve 13 is connected to the motor-driven hydraulic pump assembly 3 and the safety valve 11. Its purpose is to prevent the pressurized oil that flows through the flow bypass valve 5 to the proportional directional valve assembly 6 from flowing back into the motor-driven hydraulic pump assembly 3 during emergency mixing operations.

[0028] The emergency power system includes a chassis engine 1, which is connected to the drive shaft of an emergency hydraulic pump unit 2 via a coupling. This provides power to the unit during emergency situations.

[0029] Example 4 The electric cementing truck mud emergency treatment system includes a power switching valve group 4. The actuator end of the power switching valve group 4 is connected to a centrifugal pump drive motor group 12 and a speed control valve 10. The power source port of the power switching valve group 4 is connected to an emergency hydraulic pump group 2 and a motor-driven hydraulic pump group 3. The emergency hydraulic pump group 2 is connected to an emergency power system. The outlet end of the speed control valve 10 is connected to a stirring motor 8. The outlet of the stirring motor 8 is connected to a hydraulic oil tank 14.

[0030] The inlet of the speed control valve 10 is connected to a flow bypass valve 5, a pressure sensor 9, and a safety valve 11. The outlet of the flow bypass valve 5 is connected to a proportional directional valve group 6 and a check valve 13.

[0031] The outlet of the proportional directional valve assembly 6 is connected to the swing cylinder assembly 7, the inlet valve, and the return oil of the swing cylinder assembly 7 is connected to the hydraulic oil tank 14 after passing through the proportional directional valve assembly 6.

[0032] The inlet of the one-way valve 13 is connected to the motor-driven hydraulic pump assembly 3 and the safety valve 11.

[0033] The emergency power system includes a chassis engine 1, which is connected to the drive shaft of the emergency hydraulic pump set 2 via a coupling.

[0034] The motor-driven hydraulic pump assembly 3 includes a motor 3.1, which is connected to a transfer case 3.4. The transfer case 3.4 is connected to a closed-loop variable hydraulic pump 3.2 and an open-loop hydraulic pump 3.3. The closed-loop variable hydraulic pump 3.2 is connected to the centrifugal pump drive motor assembly 12. The centrifugal pump drive motor assembly 12 and the closed-loop variable hydraulic pump 3.2 in the motor-driven hydraulic pump assembly 3 form a closed system (i.e., the hydraulic pump outlet is connected to the motor inlet, and the motor outlet is connected to the hydraulic pump suction port). The adjustable displacement characteristic of the closed-loop variable hydraulic pump 3.2 is used to control the speed of the centrifugal pump drive motor 12.

[0035] Example 5 The electric cementing truck mud emergency treatment system includes a power switching valve group 4. The actuator end of the power switching valve group 4 is connected to a centrifugal pump drive motor group 12 and a speed control valve 10. The power source port of the power switching valve group 4 is connected to an emergency hydraulic pump group 2 and a motor-driven hydraulic pump group 3. The emergency hydraulic pump group 2 is connected to an emergency power system. The outlet end of the speed control valve 10 is connected to a stirring motor 8. The outlet of the stirring motor 8 is connected to a hydraulic oil tank 14.

[0036] The inlet of the speed control valve 10 is connected to a flow bypass valve 5, a pressure sensor 9, and a safety valve 11. The outlet of the flow bypass valve 5 is connected to a proportional directional valve group 6 and a check valve 13.

[0037] The outlet of the proportional directional valve assembly 6 is connected to the swing cylinder assembly 7, the inlet valve, and the return oil of the swing cylinder assembly 7 is connected to the hydraulic oil tank 14 after passing through the proportional directional valve assembly 6.

[0038] The inlet of the one-way valve 13 is connected to the motor-driven hydraulic pump assembly 3 and the safety valve 11.

[0039] The emergency power system includes a chassis engine 1, which is connected to the drive shaft of the emergency hydraulic pump set 2 via a coupling.

[0040] The motor-driven hydraulic pump assembly 3 includes a motor 3.1, which is connected to a transfer case 3.4. The transfer case 3.4 is connected to a closed-loop variable hydraulic pump 3.2 and an open-loop hydraulic pump 3.3. The closed-loop variable hydraulic pump 3.2 is connected to a centrifugal pump drive motor assembly 12.

[0041] like Figure 3 As shown, the power switching valve assembly 4 includes a base block 4.6, within which are installed the first power switching valve 4.1, the second power switching valve 4.2, the third power switching valve 4.3, the fourth power switching valve 4.4, and the fifth power switching valve 4.5. The oil port of the base block 4.6 is connected to the emergency hydraulic pump assembly 2 and the motor-driven hydraulic pump assembly 3. The five power switching valves are five two-position three-way solenoid valves, used to select either the motor-driven hydraulic pump assembly 3 or the emergency hydraulic pump assembly 2 as the power source for the centrifugal pump drive motor 12, the stirring motor 8, and the swing cylinder assembly 7. The first power switching valve 4.1, the second power switching valve 4.2, the third power switching valve 4.3, and the fourth power switching valve 4.4 are respectively installed on the inlet and return oil lines of the clean water centrifugal pump drive motor 12.2 and the mud centrifugal pump drive motor 12.1. The fifth power switching valve 4.5 is installed on the pressure oil line from the emergency open hydraulic pump 2.2 to the stirring motor 8. The oil flows through the internal channels of the base block 4.6 to each power switching valve. The power switching valves, according to commands issued by the control center 15, connect the pressure oil in different channels within the base block 4.6 to achieve power source switching. The power switching valve structures include, but are not limited to, two-position three-way solenoid valves, three-way ball valves with electric or pneumatic actuators, manual three-way ball valves, and cartridge valves.

[0042] Example 6 The emergency treatment method of the electric cementing truck mud emergency treatment system of the present invention is implemented according to the following steps: Step 1, Emergency Alarm like Figure 4As shown, when a power outage, battery pack failure, or other situation occurs that prevents the motor from continuing to provide power to the hydraulic system, the emergency uninterruptible power supply 16 automatically switches to the vehicle battery pack 17 to continue supplying power to the control center 15. After the control center 15 detects abnormal motor operation and hydraulic system pressure loss, it sends an action signal to the fifth power switching valve 4.5 to connect the pressure port of the emergency open hydraulic pump 2.2 to the outlet of the fifth power switching valve 4.5; it also sends an action signal to the flow bypass valve 5 to distribute the pressure oil from the outlet of the fifth power switching valve 4.5 to the proportional directional valve group 6 to control the action of the swing cylinder group 7, and at the same time issues an alarm signal. Step 2: Start the emergency power system When chassis engine 1 operates, it provides power to emergency hydraulic pump group 2. When emergency hydraulic pump group 2 operates, the pressure oil from emergency open hydraulic pump 2.2 enters the stirring motor 8 through the fifth power switching valve 4.5 and speed regulating valve 10, driving the stirring motor 8 to rotate and drive the stirring blades to stir the slurry remaining in the mixing tank to prevent solidification. At the same time, after pressure sensor 9 detects the pressure signal, control center 15 gives the proportional directional valve group 6 an action signal based on the position detection results of water inlet valve and ash inlet valve, closing the water inlet valve and ash inlet valve. Step 3: Drain the mud like Figure 5 As shown, the control center 15 gives the action signal of the third power switching valve 4.3 and the fourth power switching valve 4.4 to connect the emergency closed variable hydraulic pump 2.1 to the mud centrifugal pump drive motor 12.1. The mud centrifugal pump drive motor 12.1 drives the mud centrifugal pump to discharge the mud liquid remaining in the mixing tank. Step 4: Rinse with clean water like Figure 6 As shown, after the slurry remaining in the mixing tank is discharged, the control center 15 sends action signals to the third power switching valve 4.3 and the fourth power switching valve 4.4 to connect the emergency closed variable hydraulic pump 2.1 to the clean water centrifugal pump drive motor 12.2; it also sends an action signal to the first proportional directional valve 6.1 to open the water inlet valve; the clean water centrifugal pump drive motor 12.2 drives the clean water centrifugal pump to draw clean water and pump it into the mixing tank through the water inlet valve. After the mixing tank is stirred and flushed by the stirring motor 8, the slurry is discharged, and the slurry water is discharged and the residual slurry in the slurry pipeline is carried away. Step 5: Emergency Exit When the fault is repaired and the motor-driven hydraulic pump group 3 is working normally, the car is turned off. The control center 15 sends an action signal to the power switching valve group 4, cuts off the connection between the pressure oil port of the emergency hydraulic pump group 2 and the output port of the power switching valve group 4, and connects the motor-driven hydraulic pump group 3 to the output port of the power switching valve group 4; it also sends an action signal to the flow bypass valve 5, cuts off the oil circuit from the output port of the fifth power switching valve 4.5 to the proportional directional valve group 6.

[0043] This invention relates to an emergency mud treatment system for electric cementing trucks. It solves the problem of mud failing to drain from the mixing tank during power supply failures, reducing the risk of equipment and property damage caused by mud tank solidification and improving equipment safety and reliability. Utilizing a highly integrated power switching valve assembly, it enables power switching of the equipment's hydraulic power source in emergencies. The system features simple piping, minimal space occupation, and intelligent emergency mud treatment. Its simple structure and low manufacturing cost make it suitable for upgrading the cementing truck's hydraulic system. Only one valve assembly needs to be added at the hydraulic station, and the pump outlet pipeline is reconnected to the power switching valve assembly. All lines from the hydraulic station to the actuator remain unchanged. This system offers advantages such as minimal pipeline modifications for equipment upgrades, small vehicle space occupation, and low modification costs.

Claims

1. An emergency mud treatment system for an electric cementing truck, characterized in that, The system includes a power switching valve assembly (4), the actuator end of which is connected to a centrifugal pump drive motor assembly (12) and a speed control valve (10), the power source port of which is connected to an emergency hydraulic pump assembly (2) and a motor-driven hydraulic pump assembly (3), the emergency hydraulic pump assembly (2) is connected to an emergency power system, the outlet end of the speed control valve (10) is connected to a stirring motor (8), and the outlet of the stirring motor (8) is connected to a hydraulic oil tank (14).

2. The electric cementing truck mud emergency treatment system according to claim 1, characterized in that, The inlet of the speed control valve (10) is connected to a flow bypass valve (5), a pressure sensor (9) and a safety valve (11), and the outlet of the flow bypass valve (5) is connected to a proportional directional valve group (6) and a check valve (13).

3. The electric cementing truck mud emergency treatment system according to claim 2, characterized in that, The outlet of the proportional directional valve group (6) is connected to the swing cylinder group (7), the inlet valve and the inlet valve. The return oil of the swing cylinder group (7) is connected to the hydraulic oil tank (14) after passing through the proportional directional valve group (6).

4. The electric cementing truck mud emergency treatment system according to claim 2, characterized in that, The inlet of the one-way valve (13) is connected to the motor-driven hydraulic pump assembly (3) and the safety valve (11).

5. The electric cementing truck mud emergency treatment system according to claim 1, characterized in that, The emergency power system includes a chassis engine (1), which is connected to the drive shaft of an emergency hydraulic pump unit (2) via a coupling.

6. The electric cementing truck mud emergency treatment system according to claim 1, characterized in that, The motor-driven hydraulic pump assembly (3) includes a motor (3.1), which is connected to a transfer case (3.4). The transfer case (3.4) is connected to a closed-loop variable hydraulic pump (3.2) and an open-loop hydraulic pump (3.3). The closed-loop variable hydraulic pump (3.2) is connected to a centrifugal pump drive motor assembly (12).

7. The electric cementing truck mud emergency treatment system according to claim 1, characterized in that, The power switching valve group (4) includes a base block (4.6), in which a first power switching valve (4.1), a second power switching valve (4.2), a third power switching valve (4.3), a fourth power switching valve (4.4) and a fifth power switching valve (4.5) are respectively installed. The oil port of the base block (4.6) is connected to the emergency hydraulic pump group (2) and the motor-driven hydraulic pump group (3).

8. The emergency treatment method for the electric cementing truck mud emergency treatment system according to any one of claims 1-7, characterized in that, The specific steps are as follows: Step 1, Emergency Alarm When a power outage, battery pack failure, or other situation occurs that causes the motor to be unable to continue providing power to the hydraulic system, the emergency uninterruptible power supply (16) automatically switches to the vehicle battery pack (17) to continue supplying power to the control center (15). After the control center (15) detects that the motor is malfunctioning and the hydraulic system is depressurized, it gives the action signal of the fifth power switching valve (4.5) to connect the pressure oil port of the emergency open hydraulic pump (2.2) to the outlet of the fifth power switching valve (4.5); it gives the action signal of the flow bypass valve (5) to distribute the pressure oil from the outlet of the fifth power switching valve (4.5) to the proportional directional valve group (6) to control the action of the swing cylinder group (7) and at the same time issue an alarm signal. Step 2: Start the emergency power system The chassis engine (1) works to provide power to the emergency hydraulic pump group (2). When the emergency hydraulic pump group (2) works, the pressure oil of the emergency open hydraulic pump (2.2) enters the stirring motor (8) through the fifth power switching valve (4.5) and the speed regulating valve (10), driving the stirring motor (8) to rotate and drive the stirring blades to stir the mud liquid remaining in the mixing tank to prevent solidification. At the same time, after the pressure sensor (9) detects the pressure signal, the control center (15) gives the proportional directional valve group (6) action signal according to the position detection results of the water inlet valve and the ash inlet valve, and closes the water inlet valve and the ash inlet valve. Step 3: Drain the mud The control center (15) gives the action signal of the third power switching valve (4.3) and the fourth power switching valve (4.4) to connect the emergency closed variable hydraulic pump (2.1) and the mud centrifugal pump drive motor (12.1). The mud centrifugal pump drive motor (12.1) drives the mud centrifugal pump to discharge the mud liquid remaining in the mixing tank. Step 4: Rinse with clean water After the mud remaining in the mixing tank is drained, the control center (15) gives the action signals of the third power switching valve (4.3) and the fourth power switching valve (4.4) to connect the emergency closed variable hydraulic pump (2.1) and the clean water centrifugal pump drive motor (12.2); Give the first proportional directional valve (6.1) action signal to open the water inlet valve; drive the clean water centrifugal pump motor (12.2) to drive the clean water centrifugal pump to draw clean water and pump it into the mixing tank through the water inlet valve. After the mixing tank is stirred and rinsed by the stirring motor (8), select the "discharge mud" option again to discharge the mud water and take away the residual mud in the mud pipeline. Step 5: Emergency Exit When the fault is repaired and the motor-driven hydraulic pump group (3) is working normally, the car is turned off. The control center (15) gives the power switching valve group (4) action signal, cuts off the connection between the pressure oil port of the emergency hydraulic pump group (2) and the output port of the power switching valve group (4), and connects the motor-driven hydraulic pump group (3) and the output port of the power switching valve group (4). The flow bypass valve (5) is given an action signal to cut off the oil circuit from the output port of the fifth power switching valve (4.5) to the proportional directional valve group (6).

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