Hydraulic pipeline flushing equipment with temperature control and online circulation flushing

Abstract

The application is a hydraulic pipeline flushing equipment which can be temperature controlled and flushed on line; comprising a large oil tank, a small oil tank, a high-pressure stop valve, a low-pressure check valve, a high-pressure safety overflow valve, a large-flow low-pressure screw pump, a small-flow high-pressure gear pump, a high-pressure pressure gauge, a second pressure gauge, a ball valve for high and low pressure pressure gauges, a first and second electromagnetic reversing valve, a high and low pressure one and two stage filter, a high and low pressure circuit ball valve, a high and low pressure flowmeter, a buzzer and a low-pressure shunt ball valve; the device can be made into a modular structure to facilitate maintenance, installation and transportation, and can reduce cost and energy consumption; if the electromagnetic reversing valve fails, the valve can be removed and two shunt ball valves are used to control the oil circuit; compared with the traditional equipment, the working efficiency is high, the construction is safe, the pressure test can be completed without adding additional pressure test equipment, the oil temperature is controllable, the servo system is sensitive and the work can be controlled by a microcomputer.

Description

Technical Field

[0001] This invention relates to the field of equipment and pipeline maintenance technology, specifically a hydraulic pipeline flushing device that is temperature-controlled and capable of online circulating flushing. Background Technology

[0002] Since the beginning of the new century, science and technology have developed rapidly, and hydraulic transmission and control technologies have also seen rapid advancements, similar to other fields. However, two persistent challenges have plagued researchers in the development of hydraulic technology: leakage and contamination. These are common problems in every hydraulic system, especially for precision-controlled hydraulic servo systems. Contamination of the hydraulic servo system can lead to unreliable operation and even production line shutdowns. Currently available hydraulic flushing equipment has relatively simple functions. While it can achieve cyclic flushing, the cleanliness of the hydraulic servo system itself is insufficient, requiring longer cleaning times, which is labor-intensive, time-consuming, and energy-intensive. Traditional hydraulic flushing equipment cannot adapt to the fast pace, short construction periods, and low costs of modern construction. Furthermore, most lack computer connectivity for remote monitoring and cannot process test data for long-term equipment tracking. Additionally, the oil temperature is uncontrollable in high-temperature environments, affecting the fluid state and thus work efficiency. Moreover, pressure testing of traditional equipment requires additional equipment, increasing system design costs.

[0003] Currently, the cleaning of hydraulic steel pipes is generally accomplished by hydraulic flushing equipment, the purpose of which is to flush away scale, rust, or other mixed impurities inside the hydraulic steel pipes. A hydraulic pipeline cleaning device disclosed in Chinese patent publication CN102966641A includes an oil tank, a hydraulic oil pump, a return oil filter, and an automatic signaling level gauge. The hydraulic oil pump is connected to the oil tank via pipelines and a bypass ball valve. A filter is installed in the return oil circuit, and a heating device is installed inside the oil tank. Another device disclosed in patent publication CN209379589U includes a condensation device in the return oil circuit and a pressure probe inside the oil tank. Existing hydraulic pipeline cleaning equipment can achieve online cleaning, but it lacks microcomputer control and intelligent temperature control functions. Furthermore, the filter cannot meet the system's self-cleaning requirements, and the oil temperature is difficult to control in high-temperature environments. Additionally, the oil flow rate and the condition of the filter element cannot be monitored. Summary of the Invention

[0004] In view of the technical deficiencies of current market or traditional hydraulic flushing equipment, the purpose of this invention is to propose a hydraulic pipeline flushing device that can be circulated online and is temperature-controlled and pressure-tested. It can meet the requirements of hydraulic servo system for low-flow high-pressure flushing and high-flow low-pressure flushing, and can effectively control the oil temperature, oil level and circuit flow through microcomputer, which can effectively improve the efficiency of flushing and pressure testing and reduce costs.

[0005] To achieve the above objectives, the present invention is implemented as follows:

[0006] A temperature-controlled and online circulating hydraulic pipeline flushing device includes a large oil tank, a small oil tank, a high-pressure shut-off valve, a low-pressure check valve, a low-pressure relief valve, a high-pressure safety relief valve, a high-flow low-pressure screw pump, a low-flow high-pressure gear pump, a first solenoid directional valve, a second solenoid directional valve, a low-pressure circuit ball valve, a ball valve for a low-pressure return branch pressure gauge, a low-pressure return branch pressure gauge, a low-pressure diverter ball valve, a ball valve for a low-pressure outlet circuit pressure gauge, a low-pressure outlet branch pressure gauge, a low-pressure flow meter, a primary filter, a secondary filter, a flow sensor, a low-pressure return circuit ball valve, a pressure sensor, a buzzer, a high-pressure primary filter, a high-pressure secondary filter, a high-pressure circuit ball valve, a high-pressure diverter ball valve, a dedicated ball valve for a high-pressure return circuit pressure gauge, a high-pressure return circuit pressure gauge, a dedicated ball valve for a high-pressure return branch pressure gauge, a high-pressure return branch pressure gauge, a high-pressure flow meter, and heat insulation material.

[0007] The input end of the high-flow-rate low-pressure screw pump is connected to the oil suction port of the small oil tank, the output end of the high-flow-rate low-pressure screw pump is connected in series with the input end of the low-pressure check valve, and the output end of the low-pressure check valve is connected to the input end of the low-pressure relief valve and the input end of the first electromagnetic reversing valve, respectively.

[0008] The first output terminal of the first electromagnetic reversing valve is connected in series with the input terminal of the low-pressure circuit ball valve, and the output terminal of the low-pressure circuit ball valve is used to connect to the low-pressure pipeline to be flushed; the second output terminal of the first electromagnetic reversing valve is connected in series with the input terminal of the ball valve for the low-pressure return oil branch pressure gauge, and the output terminal of the ball valve for the low-pressure return oil branch pressure gauge is connected in series with the low-pressure return oil branch pressure gauge.

[0009] The input end of the low-pressure diversion ball valve is connected to the third output end of the first solenoid directional valve. The first output end of the low-pressure diversion ball valve is connected in series with the input end of the dedicated ball valve for the low-pressure oil outlet circuit pressure gauge. The output end of the dedicated ball valve for the low-pressure oil outlet circuit pressure gauge is connected in series with the pressure gauge of the low-pressure oil outlet branch. The second output end of the low-pressure diversion ball valve is connected in series with the low-pressure flow meter and then used to connect to the low-pressure pipeline to be flushed.

[0010] The output end of the low-pressure relief valve is connected to the input end of the primary filter, the output end of the primary filter is connected to the input end of the secondary filter, and the output end of the secondary filter is connected to the input end of the low-pressure return oil circuit ball valve and the return oil port of the small oil tank, respectively; the output end of the low-pressure return oil circuit ball valve is sequentially connected to the detection point and the input end of the primary filter.

[0011] The output terminal of the secondary filter is also connected to the input signal terminal of the pressure sensor, and the output signal terminal of the flow sensor is connected to the buzzer; the low-pressure flow meter is connected to the input signal terminal of the flow sensor.

[0012] The output end of the small flow high pressure gear pump is connected to the input end of the high pressure shut-off valve, the input end of the small flow high pressure gear pump is connected to the oil suction port of the large oil tank, and the output end of the high pressure shut-off valve is connected to the input end of the high pressure safety relief valve and the input end of the second electromagnetic reversing valve respectively.

[0013] The first output terminal of the second electromagnetic reversing valve is connected in series with the input terminal of the high-pressure circuit ball valve, and the output terminal of the high-pressure circuit ball valve is used to connect to the high-pressure pipeline to be flushed; the second output terminal of the second electromagnetic reversing valve is connected in series with the input terminal of the high-pressure return oil circuit pressure gauge dedicated ball valve, and the output terminal of the high-pressure return oil circuit pressure gauge dedicated ball valve is connected in series with the high-pressure return oil circuit pressure gauge.

[0014] The input end of the high-pressure diverting ball valve is connected to the third output end of the second solenoid directional valve. The second solenoid directional valve is connected in sequence to the high-pressure diverting ball valve and the high-pressure flow meter. The first output end of the high-pressure diverting ball valve is connected in series with the high-pressure return oil branch pressure gauge ball valve and the high-pressure return oil branch pressure gauge. The second output end of the high-pressure diverting ball valve is connected to the high-pressure flow meter.

[0015] The output end of the high-pressure safety relief valve is connected to the input end of the high-pressure primary filter, the output end of the high-pressure primary filter is connected to the input end of the high-pressure secondary filter, and the output end of the high-pressure secondary filter is sequentially connected to the input end of the high-pressure circuit ball valve and the oil inlet of the large oil tank; the output end of the high-pressure circuit ball valve is sequentially connected to the high-pressure detection point and the input end of the high-pressure primary filter.

[0016] The output terminal of the high-pressure secondary filter is also connected to the input signal terminal of the pressure sensor, and the output signal terminal of the pressure sensor is connected to the buzzer.

[0017] The heat insulation material is provided between the large oil tank and the small oil tank. The temperature-controlled and online circulating hydraulic pipeline flushing equipment also includes a heating device for controlling the temperature, which is located inside the large and small oil tanks.

[0018] The temperature-controlled and online circulating hydraulic pipeline flushing equipment also includes a visual thermometer and a visual level gauge, which are installed on the left and right sides of the large oil tank and the small oil tank.

[0019] The temperature-controlled and online circulating hydraulic pipeline flushing equipment also includes an intelligent liquid level sensor alarm system. The input and output ends of the intelligent liquid level sensor alarm system are respectively connected to the upper and lower parts of the large oil tank and the small oil tank through ball valves.

[0020] The temperature-controlled and online circulating hydraulic pipeline flushing equipment also includes heat insulation material, which is present in the interlayer at the connection between the large oil tank and the small oil tank.

[0021] The temperature-controlled and online circulating hydraulic pipeline flushing equipment also includes an automatic cooling module, which includes a fan module, an air-cooling pipe, and a temperature sensor. The fan module is connected to the air-cooling pipe, which is inserted into the oil tank.

[0022] The temperature-controlled and online circulating hydraulic pipeline flushing equipment further includes a first and a second solenoid directional valve, the output ends of which are respectively connected to the high and low pressure circuit ball valves of the oil outlet and the input end of the high and low pressure primary filter.

[0023] The temperature-controlled and online circulating hydraulic pipeline flushing equipment further includes a secondary filtration device, the input and output ends of which are respectively connected to the output end of the primary filtration device and the input end of the ball valve of the corresponding oil inlet circuit.

[0024] The temperature-controlled and online circulating hydraulic pipeline flushing equipment also includes a pressure sensor, which is connected to the output end of the secondary filtration device and a buzzer.

[0025] The temperature-controlled and online circulating hydraulic pipeline flushing equipment also includes a flow meter, which is connected to the ball valve in the oil outlet circuit.

[0026] The device proposed in this invention can be manufactured in a modular structure to facilitate maintenance, installation, and transportation. The oil pump, reversing valve, and ball valve can be made into a flushing module. The oil tank, thermometer, visual level gauge, intelligent level alarm, and fan cooling module can be considered as a common module. In this case, the module can be used in combination or individually, which can reduce costs and energy consumption. At the same time, if the electromagnetic reversing valve fails, this valve can be removed, and two diversion ball valves can be used to control the oil circuit.

[0027] Compared with traditional equipment, this device has high operating efficiency and safe construction. It can complete the pressure test without adding additional pressure testing equipment. At the same time, the oil temperature is controllable, the servo system is sensitive to changes, and it can be controlled by a microcomputer. Attached Figure Description

[0028] Figure 1 This is a hydraulic schematic diagram of the hydraulic pipeline cleaning equipment proposed in this invention.

[0029] In the diagram: 1. High-pressure oil outlet branch pressure gauge; 2. High-pressure oil return branch pressure gauge ball valve; 3. Second solenoid directional valve; 4. High-pressure safety relief valve; 5. High-pressure shut-off valve; 6. Small-flow high-pressure gear pump; 7. High-pressure primary filter; 8. High-pressure oil outlet ball valve; 9. Air filter; 10. Pressure sensor; 11. Large oil tank connection ball valve; 12. Intelligent heater; 13. Oil drain ball valve; 14. Large oil tank; 15. Air-cooled pipe; 16. Insulation layer; 17. Visual thermometer; 18. Small oil tank; 19. Visual level gauge; 20. Level sensor; 21. Small oil tank connection ball valve. 22. Buzzer; 23. Fan module; 24. Temperature sensor; 25. Motor; 26. Low-pressure oil outlet ball valve; 27. Secondary filter; 28. High-flow low-pressure screw pump; 29. ​​Low-pressure check valve; 30. Ball valve for low-pressure oil outlet circuit pressure gauge; 31. Low-pressure diverter ball valve; 32. Low-pressure oil outlet branch pressure gauge; 33. Low-pressure flow meter; 34. Detection point; 35. Low-pressure return oil circuit ball valve; 36. High-pressure circuit ball valve; 37. High-pressure circuit detection point; 38. High-pressure return oil circuit pressure gauge; 39. High-pressure diverter ball valve; 40. High-pressure return oil branch pressure gauge; 41. High-pressure flow meter. Detailed Implementation

[0030] The present invention will be further illustrated below through specific embodiments.

[0031] like Figure 1 The specific working principle of this device is divided into a low-pressure section, a high-pressure section, and a pressure testing section of the hydraulic servo system. In the specific implementation of this patented technology, in addition to the system itself needing to be pressure tested, there are three main implementation technical solutions depending on the different characteristics of the equipment being flushed and its pipelines. That is, (1) low flow and high pressure are used for system pressure testing; (2) high flow and low pressure are used for flushing large-specification main pipes; (3) low flow and low pressure are used for flushing short-distance small pipes; (4) low flow and high pressure are used for flushing branch pipes from the valve platform to the actuator and long-distance small pipes.

[0032] If this device is used to flush large-diameter steel pipes, the attached... Figure 1It can be seen that the hydraulic circuit of this device is divided into two parts; one part is that the anti-wear hydraulic oil is output by the high-flow low-pressure screw pump, and then splits into two paths after passing through the low-pressure check valve. One path is output to the first solenoid directional valve, and the other path flows into the oil tank through the filter module after passing through the safety relief valve. The path that flows into the first solenoid directional valve is split into two paths at its output end. One path enters the oil tank through the filter device, and the other path is used as flushing oil and flows back to the oil tank after passing through the filter device in the circuit. When the equipment starts running, start the screw pump and place the valve core of the first solenoid directional valve in the right position. At this time, lower the threshold of the safety relief valve. Most of the hydraulic oil will flow into the oil tank through the relief valve, and a small portion of the hydraulic oil will be used for flushing. Observe the pressure gauge of the main line and the flow meter of the branch line on the flushing line to check for pipeline leaks. After the check is completed, raise the threshold of the low-pressure safety relief valve. The flow rate of the flushing line will increase. Observe the flow meter again. After the flow meter stabilizes, pipeline cleaning can begin. Even if a pipeline leak occurs at this time, the valve core of the first solenoid directional valve can be quickly placed in the left position. At this time, the oil will flow directly into the oil tank through the circulation loop. After the hydraulic pipeline flushing process is completed, this equipment can self-clean the hydraulic servo system. At this time, the first solenoid directional valve can be placed in the right position, while the low-pressure return circuit ball valve is closed, and the return port ball valve and the high-flow low-pressure screw pump are opened. The anti-wear hydraulic oil output from the screw pump will not overflow; instead, it will pass through the low-pressure shut-off valve and then through the first solenoid directional valve to be output to the first and second stage filters, and then flow into the oil tank through the first and second stage filters, thus achieving the self-cleaning function of this device. This is a function not found in market or traditional hydraulic flushing equipment. Because the oil tank is designed as a fully enclosed tank, if oil is replenished at the flushing site, the oil will often be contaminated due to environmental factors, affecting the system and even the flushing operation. The two-stage filtration system of this device filters the anti-wear hydraulic oil twice, ensuring the cleanliness of the oil. Furthermore, the oil flows in a closed pipeline, preventing external contamination. The pressure gauge below the second stage filter can effectively monitor the filter element's condition. This implementation method can significantly improve flushing efficiency and reduce labor intensity.

[0033] For on-site construction, the flow rate has a significant impact on the flushing length and flushing effect. This device must meet both the flushing effect and the flushing requirements of different pipe diameters. Therefore, a high-flow-rate, low-pressure flushing circuit is selected for large-diameter steel pipes (diameter greater than or equal to 50mm), while a low-flow-rate, high-pressure flushing circuit is selected for small-diameter steel pipes (diameter less than 50mm).

[0034] For the low-pressure section of the device:

[0035] As can be seen from the design of this device, the flushing pump has a large flow rate but relatively low pressure, therefore it is used to flush large-diameter steel pipes. Figure 1It can be seen that the hydraulic circuit of this device is divided into two parts; one part is that the anti-wear hydraulic oil is output by the high-flow low-pressure screw pump, and then splits into two paths after passing through the low-pressure check valve. One path is output to the first solenoid directional valve, and the other path flows into the oil tank through the filter module after passing through the safety relief valve. The path that flows into the first solenoid directional valve is split into two paths at its output end. One path enters the oil tank through the filter device, and the other path is used as flushing oil and flows back to the oil tank after passing through the filter device in the circuit. When the equipment starts running, start the screw pump and place the valve core of the first solenoid directional valve in the right position. At this time, lower the threshold of the safety relief valve. Most of the hydraulic oil will flow into the oil tank through the relief valve, and a small portion of the hydraulic oil will be used for flushing. Observe the pressure gauge of the main line and the flow meter of the branch line on the flushing line to check for pipeline leaks. After the check is completed, raise the threshold of the low-pressure safety relief valve. The flow rate of the flushing line will increase. Observe the flow meter again. After the flow meter stabilizes, pipeline cleaning can begin. Even if a pipeline leak occurs at this time, the valve core of the first solenoid directional valve can be quickly placed in the left position. At this time, the oil will flow directly into the oil tank through the circulation loop. After the hydraulic pipeline flushing process is completed, this equipment can self-clean the hydraulic servo system. At this time, the first solenoid directional valve can be placed in the right position, while the low-pressure return circuit ball valve is closed, and the return port ball valve and the high-flow low-pressure screw pump are opened. The anti-wear hydraulic oil output from the screw pump will not overflow; instead, it will pass through the low-pressure shut-off valve and then through the first solenoid directional valve to be output to the first and second stage filters, and then flow into the oil tank through the first and second stage filters, thus achieving the self-cleaning function of this device. This is a function not found in market or traditional hydraulic flushing equipment. Because the oil tank is designed as a fully enclosed tank, if oil is replenished at the flushing site, the oil will often be contaminated due to environmental factors, affecting the system and even the flushing operation. The two-stage filtration system of this device filters the anti-wear hydraulic oil twice, ensuring the cleanliness of the oil. Furthermore, the oil flows in a closed pipeline, preventing external contamination. The pressure gauge below the second stage filter can effectively monitor the filter element's condition. This implementation method can significantly improve flushing efficiency and reduce labor intensity.

[0036] After the anti-wear hydraulic oil is pumped, the first component it reaches is a low-pressure check valve. This valve prevents backflow of oil when the flushing flow is too high. During high-flow flushing, if the ball valve in the outlet circuit is accidentally left open or the first solenoid directional valve malfunctions, backflow of oil can damage the low-pressure screw pump. Therefore, installing a low-pressure check valve is essential. After passing through the low-pressure check valve, the oil then passes through the first solenoid directional valve. This device controls the oil flow path and allows for intelligent interaction via a microcomputer system, making changes to the oil flow path more convenient and faster, eliminating the need for manually closing the outlet ball valve.

[0037] After passing through the first solenoid directional valve, the anti-wear hydraulic oil can be discharged through the oil outlet. The oil outlet is designed with a branch flow, and a low-pressure ball valve is installed on each branch to control each branch. This setting can simultaneously flush multiple pipelines. Pressure gauges and flow meters are also installed on the branches, so that the pressure difference and flow rate of each branch can be clearly seen by the operator. If a branch or main line malfunctions, the fault point can be quickly located and repaired.

[0038] For the high-voltage section of the device:

[0039] As can be seen from the design of this device, the flushing pump has a small flow rate but high pressure, so it is used to flush small-diameter steel pipes. After the anti-wear hydraulic oil passes through the small-flow high-pressure gear pump, similar to the low-pressure circuit, it first passes through the high-pressure shut-off valve. The function of this component is also to prevent the oil from flowing back or causing damage to the hydraulic pump. After passing through the high-pressure shut-off valve, the oil passes through the high-pressure safety relief valve. When the gear pump outputs high pressure, in order to set the maximum working pressure of the gear pump and effectively protect the small-flow high-pressure gear pump, when the high-pressure outlet ball valve is closed or the second solenoid directional valve is in the left position, the system will enter the overflow state. In order to protect the gear pump, the oil will flow into the oil tank through the relief valve.

[0040] Similarly, the airtightness of the detection system on the high-pressure circuit is the same as that on the low-pressure circuit. The operating position of the first solenoid valve and the pressure of the safety relief valve are adjusted. The system flow is controlled through the opening of the branch ball valve. Initially, the ball valve opening is set to its maximum, and the pressure gauge and flow meter are monitored. When no leakage is detected, the ball valve is gradually closed to increase the flushing flow until the flow count stabilizes, at which point the system enters a steady-state flushing state. Simultaneously, a high-pressure oil outlet ball valve is installed at the oil tank's return port for depressurization after system pressure testing. After the high-pressure circuit pressure test, a significant residual pressure remains in the pipeline. If the system is used directly without depressurization, it poses a safety hazard to operators. Therefore, after the pressure test is completed, the high-pressure return ball valve is opened to unload the system pressure.

[0041] During normal flushing, the oil flows through the high-pressure shut-off valve and then through the second solenoid directional valve into the main oil outlet circuit. An oil outlet pressure gauge is installed in this circuit to detect the pump's output pressure. Pressure gauges on the branch lines can also measure the pressure after diversion. The pressure difference between the two ends can be used to detect the blockage of the pipeline and whether there are any leaks. Simultaneously, a detection point is set in the return oil circuit to detect the oil's contamination level. If the oil cleanliness is too low, the flow path can be adjusted to allow the device to self-clean until the oil is clean.

[0042] A secondary filtration device is also installed in the flushing circuit, and a pressure gauge is installed in the branch below the device. The clogging of the filter can be judged by the change in pressure difference, thereby ensuring the safety of the equipment.

[0043] This equipment also features an intelligent air-cooling system. When the oil temperature in the tank is too high, the temperature sensor receives the temperature change information and sends the signal to the motor, causing the fan to rotate and circulate air in the air-cooling pipes, thereby cooling the oil in the tank. The tank also contains a heating module. When the oil temperature is too low and does not meet the rinsing requirements, the oil is heated until it meets the rinsing requirements, at which point heating stops.

[0044] This equipment also has an intelligent liquid level alarm system, which consists of a liquid level sensor, a buzzer, and a microcomputer. The output and input terminals of the liquid level sensor are connected to the upper and lower ends of the oil tank through ball valves. When the oil level is too low, the liquid level sensor receives a signal and transmits it to the buzzer, which then sounds an alarm, prompting the staff to add oil in time.

[0045] Hydraulic system pressure test of this equipment

[0046] During the pressure test, stop the flushing pump and close all outlets of the hydraulic system. At the start of the test, adjust the threshold of the relief valve to the lowest setting, open the outlet ball valve, and then start the oil pump. Observe the pipeline to be tested in the hydraulic system. If everything is normal, slowly close the outlet ball valve until it is completely closed. Then adjust the threshold of the safety relief valve to increase its pressure until the test pressure is reached and the pressure is increased to the strength test pressure according to the specifications. After everything is completed, raise the threshold of the safety relief valve and observe the sealing of the pipeline. After the test, lower the threshold of the relief valve and open the outlet ball valve to release the pressure.

[0047] The device can be made into a modular structure to facilitate maintenance, installation and transportation. The oil pump, reversing valve and ball valve can be made into a flushing module. The oil tank, thermometer, visual level gauge and intelligent level alarm and fan cooling module can be regarded as a common module. In this case, the module can be used in combination or individually, which can reduce costs and energy consumption.

[0048] This equipment can independently perform low-flow high-pressure flushing, high-flow low-pressure flushing, or two oil pumps operating in combination. It can also perform system pressure testing, oil filtration, system self-cleaning, low liquid level alarm, oil heating, and oil cooling. It can effectively prevent leakage during operation, greatly improve field application capabilities, adapt to various environments, effectively improve efficiency, and save costs.

Claims

1. A temperature-controlled and online circulating hydraulic pipeline flushing device, characterized in that: This includes large oil tanks, small oil tanks, high-pressure shut-off valves, low-pressure check valves, low-pressure relief valves, high-pressure safety relief valves, high-flow low-pressure screw pumps, low-flow high-pressure gear pumps, first solenoid directional valves, second solenoid directional valves, low-pressure circuit ball valves, ball valves for low-pressure return oil branch pressure gauges, low-pressure return oil branch pressure gauges, low-pressure diverter ball valves, ball valves for low-pressure outlet oil circuit pressure gauges, low-pressure outlet oil branch pressure gauges, low-pressure flow meters, primary filters, secondary filters, flow sensors, low-pressure return oil circuit ball valves, pressure sensors, buzzers, high-pressure primary filters, high-pressure secondary filters, high-pressure circuit ball valves, high-pressure diverter ball valves, dedicated ball valves for high-pressure return oil circuit pressure gauges, high-pressure return oil circuit pressure gauges, dedicated ball valves for high-pressure return oil branch pressure gauges, high-pressure return oil branch pressure gauges, high-pressure flow meters, and insulation materials. The input end of the high-flow-rate low-pressure screw pump is connected to the oil suction port of the small oil tank, the output end of the high-flow-rate low-pressure screw pump is connected in series with the input end of the low-pressure check valve, and the output end of the low-pressure check valve is connected to the input end of the low-pressure relief valve and the input end of the first electromagnetic reversing valve, respectively. The first output terminal of the first electromagnetic reversing valve is connected in series with the input terminal of the low-pressure circuit ball valve, and the output terminal of the low-pressure circuit ball valve is used to connect to the low-pressure pipeline to be flushed; the second output terminal of the first electromagnetic reversing valve is connected in series with the input terminal of the ball valve for the low-pressure return oil branch pressure gauge, and the output terminal of the ball valve for the low-pressure return oil branch pressure gauge is connected in series with the low-pressure return oil branch pressure gauge. The input end of the low-pressure diversion ball valve is connected to the third output end of the first solenoid directional valve. The first output end of the low-pressure diversion ball valve is connected in series with the input end of the dedicated ball valve for the low-pressure oil outlet circuit pressure gauge. The output end of the dedicated ball valve for the low-pressure oil outlet circuit pressure gauge is connected in series with the pressure gauge of the low-pressure oil outlet branch. The second output end of the low-pressure diversion ball valve is connected in series with the low-pressure flow meter and then used to connect to the low-pressure pipeline to be flushed. The output end of the low-pressure relief valve is connected to the input end of the primary filter, the output end of the primary filter is connected to the input end of the secondary filter, and the output end of the secondary filter is connected to the input end of the low-pressure return oil circuit ball valve and the return oil port of the small oil tank, respectively; the output end of the low-pressure return oil circuit ball valve is sequentially connected to the detection point and the input end of the primary filter. The output terminal of the secondary filter is also connected to the input signal terminal of the pressure sensor, and the output signal terminal of the flow sensor is connected to the buzzer; the low-pressure flow meter is connected to the input signal terminal of the flow sensor. The output end of the small flow high pressure gear pump is connected to the input end of the high pressure shut-off valve, the input end of the small flow high pressure gear pump is connected to the oil suction port of the large oil tank, and the output end of the high pressure shut-off valve is connected to the input end of the high pressure safety relief valve and the input end of the second electromagnetic reversing valve respectively. The first output terminal of the second electromagnetic reversing valve is connected in series with the input terminal of the high-pressure circuit ball valve, and the output terminal of the high-pressure circuit ball valve is used to connect to the high-pressure pipeline to be flushed; the second output terminal of the second electromagnetic reversing valve is connected in series with the input terminal of the high-pressure return oil circuit pressure gauge dedicated ball valve, and the output terminal of the high-pressure return oil circuit pressure gauge dedicated ball valve is connected in series with the high-pressure return oil circuit pressure gauge. The input end of the high-pressure diverting ball valve is connected to the third output end of the second solenoid directional valve. The second solenoid directional valve is connected in sequence to the high-pressure diverting ball valve and the high-pressure flow meter. The first output end of the high-pressure diverting ball valve is connected in series with the high-pressure return oil branch pressure gauge ball valve and the high-pressure return oil branch pressure gauge. The second output end of the high-pressure diverting ball valve is connected to the high-pressure flow meter. The output end of the high-pressure safety relief valve is connected to the input end of the high-pressure primary filter, the output end of the high-pressure primary filter is connected to the input end of the high-pressure secondary filter, and the output end of the high-pressure secondary filter is sequentially connected to the input end of the high-pressure circuit ball valve and the oil inlet of the large oil tank; the output end of the high-pressure circuit ball valve is sequentially connected to the high-pressure detection point and the input end of the high-pressure primary filter. The output terminal of the high-pressure secondary filter is also connected to the input signal terminal of the pressure sensor, and the output signal terminal of the pressure sensor is connected to the buzzer. The heat insulation material is provided between the large fuel tank and the small fuel tank.

2. The temperature-controlled and online circulating hydraulic pipeline flushing equipment according to claim 1, characterized in that: It also includes a heating device for controlling the temperature, which is disposed inside the large oil tank and the small oil tank.

3. The temperature-controlled and online circulating hydraulic pipeline flushing equipment according to claim 1, characterized in that: It also includes a visual thermometer and a visual level gauge, which are respectively installed on the left and right sides of the large oil tank and the small oil tank.

4. The temperature-controlled and online circulating hydraulic pipeline flushing equipment according to claim 1, characterized in that: It also includes an intelligent liquid level sensor alarm system, the input and output of which are connected to the upper and lower parts of the large oil tank and the small oil tank respectively via ball valves.

5. The temperature-controlled and online circulating hydraulic pipeline flushing equipment according to claim 1, characterized in that: The heat insulation material is present in the interlayer at the connection between the large fuel tank and the small fuel tank.

6. The temperature-controlled and online circulating hydraulic pipeline flushing equipment according to claim 1, characterized in that: It also includes an automatic cooling module, which includes a fan module, an air-cooling pipe, and a temperature sensor. The fan module is connected to the air-cooling pipe, and the air-cooling pipe is inserted into the interior of the large oil tank and the small oil tank.

7. The temperature-controlled and online circulating hydraulic pipeline flushing equipment according to claim 1, characterized in that: The output end of the first solenoid directional valve is connected to the input end of the low-pressure circuit ball valve and the primary filter; the output end of the second solenoid directional valve is connected to the input end of the high-pressure circuit ball valve and the primary filter.

8. The temperature-controlled and online circulating hydraulic pipeline flushing equipment according to claim 1, characterized in that: The input end of the secondary filter is connected to the output end of the primary filter, and the output end of the secondary filter is connected to the input end of the inlet circuit ball valve.

9. The temperature-controlled and online circulating hydraulic pipeline flushing equipment according to claim 1, characterized in that: The pressure sensor is connected to the output terminal of the secondary filter, and the output signal terminal of the pressure sensor is connected to the buzzer.

10. The temperature-controlled and online circulating hydraulic pipeline flushing equipment according to claim 1, characterized in that: The low-pressure flow meter is connected to the ball valve in the low-pressure oil outlet circuit, and the high-pressure flow meter is connected to the ball valve in the high-pressure oil outlet circuit.

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