A hydraulic pipeline flushing and oil temperature control system

Abstract

A hydraulic pipeline flushing and oil temperature control system, the hydraulic pipeline flushing and oil temperature control system comprises a flushing oil tank, a pressure control valve group, an oil inlet main pipe, a heating valve group, an oil return main pipe and a water pump; the oil outlet end of the flushing oil tank is connected to the oil inlet end of the pressure control valve group, the oil outlet end of the pressure control valve group is connected to the oil inlet end of a hydraulic pump group, the hydraulic pump group is connected to a motor, the oil inlet end of the flushing oil tank is connected to the oil outlet end of a butterfly valve, a stroke limit switch is arranged between the oil outlet end of a butterfly valve and the oil inlet end of a hydraulic pump group, and two check valves are arranged between the oil outlet end of a hydraulic pump group and the oil circuit of the oil inlet main pipe. The design monitors the temperature of the hydraulic oil in the flushing oil tank in real time through a temperature sensor, and when the oil temperature is too high, the cooler is turned on to cool the oil in the pipeline, so that the oil temperature in the hydraulic system is kept within the optimal temperature, thereby improving the flushing efficiency of the hydraulic pipeline.

Description

Technical Field

[0001] The invention relates to an improvement of a hydraulic pipeline temperature control technology, belongs to the field of hydraulic systems, and in particular to a hydraulic pipeline flushing and oil temperature control system. Background Art

[0002] In the field of ships, hydraulic systems are widely used, and the cleanliness of the oil in the hydraulic system pipeline has a direct impact on the normal operation of the hydraulic system. Generally speaking, the requirements for hydraulic system oil pollution are as follows: 1) Ordinary transmission systems require NAS.8 or higher; 2) Proportional control systems (including proportional pumps or proportional valves) require NAS7 or higher; 3) Servo systems require NAS5 or higher; The existing hydraulic pipeline flushing system basically uses low-pressure and low-flow systems such as gear pumps and screw pumps, and the traditional heating solution for hydraulic oil is to add an electric heater in the oil tank. The existing system has problems: The traditional electric heater will increase the cost of the hydraulic system and the difficulty of the tank space layout, and the pipeline flushing effect is poor, which is difficult to meet the requirements of pipeline flushing on the ship deck; The heat energy generated by the system during pipeline flushing is not reused, causing thermal pollution to the environment and energy waste.

[0003] The Chinese invention patent with application number CN201910078097.0 and application date January 18, 2019 discloses an intelligent temperature control system for hydraulic oil temperature of a coke oven vehicle, including a PLC control system, a hydraulic system and a pipeline. The hydraulic system includes a temperature sensor. The present invention also includes a pneumatic valve, an air compressor, a refrigerated air dryer, an air bag (and a return air pipeline; the temperature sensor is arranged on the oil tank of the hydraulic system, and the temperature sensor sends the detected temperature signal to the PLC control system. The PLC control system sends a signal to control the opening of the cylinder cooling gas solenoid valve, and the air enters the air bag through the air compressor and the pipeline. The present invention can realize full automatic control during the operation of coke oven vehicles such as coal loading vehicles, coke pushing vehicles, and coke guiding vehicles, and also prolongs the service life of hydraulic oil and oil cylinders and achieves the recycling of residual gas, but does not solve the problem of improving flushing efficiency and utilizing flushing heat.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of this patent application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems of low flushing efficiency and heat waste in the prior art, and to provide a hydraulic pipeline flushing and oil temperature control system with high flushing efficiency and high heat utilization rate.

[0006] To achieve the above objectives, the technical solution of the present invention is: a hydraulic pipeline flushing and oil temperature control system, the hydraulic pipeline flushing and oil temperature control system includes a flushing oil tank, a pressure control valve group, an oil inlet main pipe, a heating valve group, an oil return main pipe and a water pump;

[0007] The oil outlet of the flushing oil tank is connected to the oil inlet of the pressure control valve group, the oil outlet of the pressure control valve group is connected to the oil inlet of a hydraulic pump group, the hydraulic pump group is connected to a motor, the oil inlet of the flushing oil tank is connected to the oil outlet of a butterfly valve, a travel limit switch is provided between the oil outlet of the butterfly valve and the oil inlet of the hydraulic pump group, two one-way valves are provided between the oil outlet of the hydraulic pump group and the oil circuit of the oil inlet main pipe, a safety valve is provided between the oil inlet main pipe and the oil circuit of the flushing oil tank, the oil outlet of the oil inlet main pipe is connected to the oil inlet of the oil return main pipe, and a heating valve group is provided between the oil inlet main pipe and the oil circuit of the oil return main pipe;

[0008] Two groups of return oil filters are installed in the flushing oil tank, a cooler and eleven one-way valves are arranged between the return oil main pipe and the oil circuit of the flushing oil tank, the water outlet of the water pump is connected with the water inlet of the high-level water tank via a stop valve, the water outlet of the high-level water tank is connected with the cooler via the R end, the water inlet of the water pump is connected with the cooler via two stop valves via the R end, a heater is arranged between the two stop valves and the cooler, and a temperature sensor is installed on the flushing oil tank.

[0009] A one-way valve is arranged between the flushing oil tank and the oil circuit of the pressure control valve group.

[0010] The oil outlet of the pressure control valve group is connected to the oil inlet of the second hydraulic pump group, and the oil outlet of the pressure control valve group is connected to the oil inlet of the third hydraulic pump group. The structures of the first hydraulic pump group, the second hydraulic pump group and the third hydraulic pump group are the same.

[0011] The pressure control valve group includes a proportional relief valve, the oil outlet end of the flushing oil tank is connected to the oil inlet end of the proportional relief valve, the oil outlet end of the proportional relief valve is connected to the oil inlet end of a throttling stop valve, and the oil outlet end of the throttling stop valve is connected to the oil inlet main pipe via the C end.

[0012] A filter is arranged between the throttling stop valve and the oil circuit at the C end, a pressure difference indicator is arranged on the filter, the oil outlet end of the flushing oil tank is connected with the oil inlet end of the pilot relief valve, and the oil outlet end of the pilot relief valve is connected with the oil inlet main pipe via the C end.

[0013] The pressure control valve group also includes an electromagnetic reversing valve, two electromagnetic reversing valves and three electromagnetic reversing valves. The oil outlet end of the flushing oil tank is connected to the oil inlet end of the electromagnetic reversing valve, the oil outlet end of the electromagnetic reversing valve is connected to the oil inlet end of the five check valves, the oil outlet end of the five check valves is connected to the oil inlet main pipe via the C end, the oil outlet end of the flushing oil tank is connected to the oil inlet end of the second electromagnetic reversing valve, the oil outlet end of the second electromagnetic reversing valve is connected to the oil inlet end of the sixth check valve, the oil outlet end of the six check valves is connected to the second hydraulic pump group via the C end, the oil outlet end of the flushing oil tank is connected to the oil inlet end of the third electromagnetic reversing valve, the oil outlet end of the third electromagnetic reversing valve is connected to the oil inlet end of the seventh check valve, and the oil outlet end of the seven check valves is connected to the third hydraulic pump group via the C end.

[0014] The P end of the heating valve group is communicated with the oil inlet main pipe, and the T end of the heating valve group is communicated with the oil return main pipe.

[0015] The heating valve group includes two throttling stop valves, the oil outlet end of the oil inlet main pipe is connected with the oil inlet end of the second throttling stop valve via the P end, the oil outlet end of the second throttling stop valve is connected with the oil inlet end of the return oil main pipe via the T end through a throttling hole, the oil outlet end of the second throttling stop valve is connected with the oil inlet end of the return oil main pipe via the T end through the second throttling hole, and the oil outlet end of the second throttling stop valve is connected with the oil inlet end of the return oil main pipe via the T end through the third throttling hole.

[0016] Nine one-way valves are arranged between the second throttle stop valve and the oil circuit at the P end, and eight one-way valves are arranged between the first throttle hole, the second throttle hole, the third throttle hole and the oil circuit at the T end.

[0017] The return oil filter comprises two filters, two pressure difference indicators and ten one-way valves. The two filters are connected to the return oil main pipe, and the oil outlet end of the return oil main pipe is connected to the oil inlet end of the ten one-way valves.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In a hydraulic pipeline flushing and oil temperature control system of the present invention, the oil outlet of the flushing oil tank is connected to the oil inlet of the pressure control valve group, the oil outlet of the pressure control valve group is connected to the oil inlet of a hydraulic pump group, the hydraulic pump group is connected to a motor, the oil inlet of the flushing oil tank is connected to the oil outlet of a butterfly valve, a travel limit switch is arranged between the oil outlet of the butterfly valve and the oil inlet of the hydraulic pump group, two check valves are arranged between the oil outlet of the hydraulic pump group and the oil circuit of the oil inlet main pipe, a safety valve is arranged between the oil inlet main pipe and the oil circuit of the flushing oil tank, and the oil inlet main pipe The oil outlet is connected to the oil inlet of the oil return pipe, and a heating valve group is provided between the oil inlet pipe and the oil return pipe. When flushing the hydraulic pipeline, the heating valve group is opened to connect the oil inlet pipe and the oil return pipe in the hydraulic system. The hydraulic oil in the hydraulic pipeline can be circulated and heated through the throttle hole of the heating valve group. The temperature of the hydraulic oil in the flushing oil tank is monitored in real time through the temperature sensor. When the oil temperature is too high, the cooler is turned on to cool the oil in the pipeline, so that the oil temperature in the hydraulic system is maintained at the optimal temperature of 50℃ to 55℃, thereby improving the flushing efficiency of the hydraulic pipeline. Therefore, this design has high flushing efficiency and can detect temperature control in real time.

[0020] 2. In a hydraulic pipeline flushing and oil temperature control system of the present invention, two groups of return oil filters are installed in the flushing oil tank, a cooler and eleven one-way valves are arranged between the return oil main pipe and the oil circuit of the flushing oil tank, the water outlet of the water pump is connected to the water inlet of the high-level water tank through a stop valve, the water outlet of the high-level water tank is connected to the cooler through the R end, the water inlet of the water pump is connected to the cooler through two stop valves through the R end, a heater is arranged between the two stop valves and the cooler, a temperature sensor is installed on the flushing oil tank, the cooling water in the high-level water tank is heated up after sufficient heat exchange with the hydraulic oil in the cooler, and then passes through the heater, and finally outputs hot water, which can be used as washing and bathing water for people to use, and the secondary use of the cooling water temperature can reduce the thermal pollution to the environment, and compared with the direct heating of low-temperature tap water by the heater, the direct use of tap water after heat exchange by the cooler or the use after reheating by the heater can save energy consumption. Therefore, this design reduces energy consumption and recycles energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is a structural schematic diagram of the pressure control valve group in the present invention.

[0023] Figure 3 It is a structural schematic diagram of the heating valve group in the present invention.

[0024] Figure 4 It is a schematic diagram of the structure of the oil return filter in the present invention.

[0025] In the figure: flushing oil tank 1, return oil filter 2, second filter 2.1, second pressure difference indicator 2.2, ten check valves 2.3, cooler 3, pressure control valve group 4, proportional relief valve 4.1, first throttling stop valve 4.2, first filter 4.3, first pressure difference indicator 4.4, pilot relief valve 4.5, first solenoid reversing valve 4.6, fifth check valve 4.61, second solenoid reversing valve 4.7, sixth check valve 4.71, third solenoid reversing valve 4.8, seventh check valve 4.81, first hydraulic pump group 5, second hydraulic pump group 5 .1, three hydraulic pump groups 5.2, safety valve 6, oil inlet main pipe 7, heating valve group 8, two throttling stop valves 8.1, one throttling hole 8.2, two throttling holes 8.3, three throttling holes 8.4, eight check valves 8.5, nine check valves 8.6, oil return main pipe 9, two check valves 10, one check valve 11, eleven check valves 12, temperature sensor 13, high-level water tank 14, heater 15, one motor 16, one butterfly valve 17, one travel limit switch 17.1, water pump 18, one stop valve 19, two stop valves 20. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] See also Figures 1 to 4 A hydraulic pipeline flushing and oil temperature control system, the hydraulic pipeline flushing and oil temperature control system comprises a flushing oil tank 1, a pressure control valve group 4, an oil inlet main pipe 7, a heating valve group 8, an oil return main pipe 9 and a water pump 18;

[0028] The oil outlet of the flushing oil tank 1 is connected to the oil inlet of the pressure control valve group 4, the oil outlet of the pressure control valve group 4 is connected to the oil inlet of a hydraulic pump group 5, the hydraulic pump group 5 is connected to a motor 16, the oil inlet of the flushing oil tank 1 is connected to the oil outlet of a butterfly valve 17, a travel limit switch 17.1 is provided between the oil outlet of the butterfly valve 17 and the oil inlet of the hydraulic pump group 5, two check valves 10 are provided between the oil outlet of the hydraulic pump group 5 and the oil circuit of the oil inlet main pipe 7, a safety valve 6 is provided between the oil inlet main pipe 7 and the oil circuit of the flushing oil tank 1, the oil outlet of the oil inlet main pipe 7 is connected to the oil inlet of the oil return main pipe 9, and a heating valve group 8 is provided between the oil inlet main pipe 7 and the oil circuit of the oil return main pipe 9;

[0029] Two sets of return oil filters 2 are installed in the flushing oil tank 1, a cooler 3 and eleven one-way valves 12 are arranged between the return oil main pipe 9 and the oil circuit of the flushing oil tank 1, the water outlet end of the water pump 18 is connected with the water inlet end of the high-level water tank 14 via a stop valve 19, the water outlet end of the high-level water tank 14 is connected with the cooler 3 via the R1 end, the water inlet end of the water pump 18 is connected with the cooler 3 via the R2 end through two stop valves 20, a heater 15 is arranged between the two stop valves 20 and the cooler 3, and a temperature sensor 13 is installed on the flushing oil tank 1.

[0030] A one-way valve 11 is provided between the oil circuit of the flushing oil tank 1 and the pressure control valve group 4 .

[0031] The oil outlet of the pressure control valve group 4 is connected to the oil inlet of the second hydraulic pump group 5.1, and the oil outlet of the pressure control valve group 4 is connected to the oil inlet of the third hydraulic pump group 5.2. The structures of the first hydraulic pump group 5, the second hydraulic pump group 5.1 and the third hydraulic pump group 5.2 are the same.

[0032] The pressure control valve group 4 includes a proportional relief valve 4.1, the oil outlet of the flushing oil tank 1 is connected to the oil inlet of the proportional relief valve 4.1, the oil outlet of the proportional relief valve 4.1 is connected to the oil inlet of a throttling stop valve 4.2, and the oil outlet of the throttling stop valve 4.2 is connected to the oil inlet main pipe 7 through the C1 end.

[0033] A filter 4.3 is provided between the throttling stop valve 4.2 and the oil circuit at the C1 end, a pressure difference indicator 4.4 is provided on the filter 4.3, the oil outlet end of the flushing oil tank 1 is connected to the oil inlet end of the pilot relief valve 4.5, and the oil outlet end of the pilot relief valve 4.5 is connected to the oil inlet main pipe 7 through the C1 end.

[0034] The pressure control valve group 4 also includes a solenoid reversing valve 4.6, a second solenoid reversing valve 4.7 and a third solenoid reversing valve 4.8. The oil outlet of the flushing oil tank 1 is connected to the oil inlet of the first solenoid reversing valve 4.6, the oil outlet of the first solenoid reversing valve 4.6 is connected to the oil inlet of the fifth check valve 4.61, the oil outlet of the fifth check valve 4.61 is connected to the oil inlet main pipe 7 through the C1 end, the oil outlet of the flushing oil tank 1 is connected to the oil inlet of the second solenoid reversing valve 4.7. The oil outlet end of the second electromagnetic reversing valve 4.7 is connected with the oil inlet end of the sixth non-return valve 4.71, the oil outlet end of the sixth non-return valve 4.71 is connected with the second hydraulic pump group 5.1 via the C2 end, the oil outlet end of the flushing oil tank 1 is connected with the oil inlet end of the third electromagnetic reversing valve 4.8, the oil outlet end of the third electromagnetic reversing valve 4.8 is connected with the oil inlet end of the seventh non-return valve 4.81, and the oil outlet end of the seventh non-return valve 4.81 is connected with the third hydraulic pump group 5.2 via the C3 end.

[0035] The P1 end of the heating valve group 8 is communicated with the oil inlet main pipe 7 , and the T1 end of the heating valve group 8 is communicated with the oil return main pipe 9 .

[0036] The heating valve group 8 includes two throttling stop valves 8.1, the oil outlet end of the oil inlet main pipe 7 is connected to the oil inlet end of the second throttling stop valve 8.1 through the P1 end, the oil outlet end of the second throttling stop valve 8.1 is connected to the oil inlet end of the return oil main pipe 9 through the T1 end via a throttling hole 8.2, the oil outlet end of the second throttling stop valve 8.1 is connected to the oil inlet end of the return oil main pipe 9 through the T1 end via a second throttling hole 8.3, and the oil outlet end of the second throttling stop valve 8.1 is connected to the oil inlet end of the return oil main pipe 9 through the T1 end via a third throttling hole 8.4.

[0037] A nine-way check valve 8.6 is provided between the second throttle stop valve 8.1 and the oil circuit at the P1 end, and an eight-way check valve 8.5 is provided between the first throttle hole 8.2, the second throttle hole 8.3, the third throttle hole 8.4 and the oil circuit at the T1 end.

[0038] The oil return filter 2 comprises two filters 2.1, two pressure difference indicators 2.2 and ten one-way valves 2.3. The two filters 2.1 are connected to the oil return main pipe 9. The oil outlet of the oil return main pipe 9 is connected to the oil inlet of the ten one-way valves 2.3.

[0039] The principle of the present invention is described as follows:

[0040] After starting a hydraulic pump group 5, the hydraulic pump group 5 absorbs oil from the flushing oil tank 1 through the oil inlet, and the output pressure oil passes through the second check valve 10 into the oil inlet main pipe 7, and then passes through the heating valve group 8 into the oil return main pipe 9, and finally passes through the eleventh check valve 12, the cooler 3 and the return oil filter 2 to return to the flushing oil tank 1, and controls each hydraulic pump group 5 through the first electromagnetic reversing valve 4.6, the second electromagnetic reversing valve 4.7, and the third electromagnetic reversing valve 4.8 (three electromagnetic valve groups) in the pressure control valve group 4 Unloading or loading, when the electromagnets of the three solenoid valve groups lose power, the control oil of the hydraulic pump group 5 flows directly back to the oil tank through the three solenoid valve groups. At this time, the output pressure of the hydraulic pump group 5 is low, and the hydraulic pump group 5 is in an unloading state. When the electromagnets of the three solenoid valve groups are energized, the control oil of the hydraulic pump group 2 passes through the five-check valve 4.61, the six-check valve 4.71, and the seven-check valve 4.81 (three-check valve groups) and then enters the oil inlet of the pilot relief valve 4.5 and the proportional relief valve 4.1. The pressure of the hydraulic pump group 2 control oil port can be adjusted by the pressure setting of the pilot relief valve 4.5 and the proportional relief valve 4.1, so as to control the flushing pressure of the hydraulic oil in the oil inlet main pipe 7; when the hydraulic system is cold started, the oil temperature is low and the viscosity of the oil in the pipeline is large, so the hydraulic system cannot work directly; when the heating valve group 8 is closed, the pressure of the hydraulic pump group 2 control oil port can be gradually adjusted. When the required pressure is reached, the pump pressure test of the oil inlet main pipe 7 is carried out. After the pump pressure is qualified, the hydraulic pipeline is flushed, and the second throttle stop valve 8.1 in the heating valve group 8 is opened to connect the oil inlet main pipe 7 with the return oil main pipe 9 in the hydraulic system. The hydraulic oil in the hydraulic pipeline can be circulated and heated through the throttle hole of the heating valve group 8. The temperature of the hydraulic oil in the flushing oil tank 1 is monitored in real time by the temperature sensor 13. When the oil temperature is too high, the cooler 3 is opened to cool the oil in the pipeline, so that the oil temperature in the hydraulic system is maintained at the optimal temperature of 50°C~55°C, thereby improving the flushing efficiency of the hydraulic pipeline.

[0041] Embodiment 1:

[0042] A hydraulic pipeline flushing and oil temperature control system, the hydraulic pipeline flushing and oil temperature control system comprises a flushing oil tank 1, a pressure control valve group 4, an oil inlet main pipe 7, a heating valve group 8, an oil return main pipe 9 and a water pump 18; the oil outlet end of the flushing oil tank 1 is connected to the oil inlet end of the pressure control valve group 4, the oil outlet end of the pressure control valve group 4 is connected to the oil inlet end of a hydraulic pump group 5, the hydraulic pump group 5 is connected to a motor 16, the oil inlet end of the flushing oil tank 1 is connected to the oil outlet end of a butterfly valve 17, a travel limit switch 17.1 is arranged between the oil outlet end of the butterfly valve 17 and the oil inlet end of the hydraulic pump group 5, two check valves 10 are arranged between the oil outlet end of the hydraulic pump group 5 and the oil circuit of the oil inlet main pipe 7, a safety valve 6 is arranged between the oil inlet main pipe 7 and the oil circuit of the flushing oil tank 1, the oil inlet of the safety valve 6 is connected to the oil inlet main pipe 7 of the hydraulic system, and the oil return port of the safety valve 6 is connected through The pipeline is connected with the flushing oil tank 1, which mainly plays a role of pressure limiting protection in the hydraulic system to prevent the oil inlet pipe 7 of the hydraulic system from being over-pressured and causing danger. The oil outlet end of the oil inlet pipe 7 is connected with the oil inlet end of the oil return pipe 9, and a heating valve group 8 is arranged between the oil inlet pipe 7 and the oil circuit of the oil return pipe 9; two groups of return oil filters 2 are installed in the flushing oil tank 1, and a cooler 3 and eleven one-way valves 12 are arranged between the return oil pipe 9 and the oil circuit of the flushing oil tank 1. The water outlet end of the water pump 18 is connected with the water inlet end of the high-level water tank 14 through a stop valve 19, and the water outlet end of the high-level water tank 14 is connected with the cooler 3 through the R1 end. The water inlet end of the water pump 18 is connected with the cooler 3 through the R2 end through two stop valves 20, and a heater 15 is arranged between the two stop valves 20 and the cooler 3. A temperature sensor 13 is installed on the flushing oil tank 1 to provide real-time feedback on the temperature of the hydraulic oil in the flushing oil tank 1.

[0043] When the present invention is applied:

[0044] After starting a hydraulic pump group 5, the hydraulic pump group 5 absorbs oil from the flushing oil tank 1 through the oil inlet, and the output pressure oil passes through the second one-way valve 10 into the oil inlet main pipe 7, and then passes through the heating valve group 8 into the oil return main pipe 9, and finally passes through the eleventh one-way valve 12, the cooler 3 and the return oil filter 2 to return to the flushing oil tank 1. The unloading or loading of each hydraulic pump group 5 is controlled by the pressure control valve group 4. When the pressure control valve group 4 loses power, the control oil of the hydraulic pump group 5 directly flows back to the oil tank through the three solenoid valve groups. At this time, the output pressure of the hydraulic pump group 5 is low, and the hydraulic pump group 5 is in an unloading state. When the pressure control valve group 4 is energized, the control oil of the hydraulic pump group 2 passes through the oil inlet of the pressure control valve group 4. The pressure of the control oil port of the hydraulic pump group 2 can be adjusted by the pressure setting of the pressure control valve group 4, thereby Control the flushing pressure of the hydraulic oil in the oil inlet main pipe 7; when the hydraulic system is cold-started, the oil temperature is low and the viscosity of the oil in the pipeline is large, so the hydraulic system cannot work directly; when the heating valve group 8 is closed, the pressure of the hydraulic pump group 2 controlling the oil port can be gradually adjusted. When the required pressure is reached, the oil inlet main pipe 7 is subjected to a pump pressure test. After the pump pressure is qualified, the hydraulic pipeline is flushed, and the heating valve group 8 is opened to connect the oil inlet main pipe 7 with the oil return main pipe 9 in the hydraulic system. The hydraulic oil in the hydraulic pipeline can be circulated and heated through the throttle hole of the heating valve group 8. The temperature of the hydraulic oil in the flushing oil tank 1 is monitored in real time through the temperature sensor 13. When the oil temperature is too high, the cooler 3 is opened to cool the oil in the pipeline, so that the oil temperature in the hydraulic system is maintained at the optimal temperature of 50°C~55°C, thereby improving the flushing efficiency of the hydraulic pipeline.

[0045] Embodiment 2:

[0046] Embodiment 2 is substantially the same as Embodiment 1, except that:

[0047] A hydraulic pipeline flushing and oil temperature control system, wherein a one-way valve 11 is arranged between the flushing oil tank 1 and the oil circuit of the pressure control valve group 4; the oil outlet of the pressure control valve group 4 is connected to the oil inlet of the second hydraulic pump group 5.1, and the oil outlet of the pressure control valve group 4 is connected to the oil inlet of the third hydraulic pump group 5.2. The structures of the first hydraulic pump group 5, the second hydraulic pump group 5.1 and the third hydraulic pump group 5.2 are the same; the pressure control valve group 4 includes a proportional relief valve 4.1, a flushing The oil outlet of the oil tank 1 is connected to the oil inlet of the proportional relief valve 4.1, the oil outlet of the proportional relief valve 4.1 is connected to the oil inlet of a throttling stop valve 4.2, the oil outlet of the throttling stop valve 4.2 is connected to the oil inlet main pipe 7 through the C1 end; a filter 4.3 is arranged between the oil circuit of the throttling stop valve 4.2 and the C1 end, a pressure difference indicator 4.4 is arranged on the filter 4.3, the oil outlet of the flushing oil tank 1 is connected to the oil inlet of the pilot relief valve 4.5, the pilot relief valve 4.5 is connected to the oil inlet of the pilot relief valve 4.6, and the pilot relief valve 4.7 is connected to the oil inlet of the pilot relief valve 4.8. The oil outlet of the pilot overflow valve 4.5 is connected to the oil inlet main pipe 7 via the C1 end; the pressure control valve group 4 also includes a solenoid reversing valve 4.6, a second solenoid reversing valve 4.7 and a third solenoid reversing valve 4.8, the oil outlet of the flushing oil tank 1 is connected to the oil inlet end of the first solenoid reversing valve 4.6, the oil outlet of the first solenoid reversing valve 4.6 is connected to the oil inlet end of the fifth check valve 4.61, the oil outlet of the fifth check valve 4.61 is connected to the oil inlet main pipe 7 via the C1 end, the oil outlet of the flushing oil tank 1 is connected to The oil inlet end of the second electromagnetic reversing valve 4.7 is connected, the oil outlet end of the second electromagnetic reversing valve 4.7 is connected to the oil inlet end of the sixth check valve 4.71, the oil outlet end of the sixth check valve 4.71 is connected to the second hydraulic pump group 5.1 through the C2 end, the oil outlet end of the flushing oil tank 1 is connected to the oil inlet end of the third electromagnetic reversing valve 4.8, the oil outlet end of the third electromagnetic reversing valve 4.8 is connected to the oil inlet end of the seventh check valve 4.81, and the oil outlet end of the seventh check valve 4.81 is connected to the third hydraulic pump group 5.2 through the C3 end.

[0048] Embodiment 3:

[0049] Embodiment 3 is substantially the same as Embodiment 2, except that:

[0050] A hydraulic pipeline flushing and oil temperature control system, wherein the P1 end of the heating valve group 8 is connected to the oil inlet main pipe 7, and the T1 end of the heating valve group 8 is connected to the oil return main pipe 9; the heating valve group 8 includes two throttling stop valves 8.1, the oil outlet end of the oil inlet main pipe 7 is connected to the oil inlet end of the second throttling stop valve 8.1 through the P1 end, the oil outlet end of the second throttling stop valve 8.1 is connected to the oil inlet end of the oil return main pipe 9 through the T1 end through a throttling hole 8.2, the oil outlet end of the second throttling stop valve 8.1 is connected to the oil inlet end of the oil return main pipe 9 through the T1 end through two throttling holes 8.3, and the two throttling The oil outlet of the stop valve 8.1 is connected to the oil inlet of the return oil main pipe 9 through the three throttle holes 8.4 and the T1 end; a nine-way valve 8.6 is arranged between the two throttle stop valves 8.1 and the oil circuit of the P1 end, and an eight-way valve 8.5 is arranged between the one throttle hole 8.2, the two throttle holes 8.3, the three throttle holes 8.4 and the oil circuit of the T1 end; the return oil filter 2 includes two filters 2.1, two pressure difference indicators 2.2 and ten one-way valves 2.3, the two filters 2.1 are connected to the return oil main pipe 9, and the oil outlet of the return oil main pipe 9 is connected to the oil inlet of the ten one-way valves 2.3.

[0051] Embodiment 4:

[0052] Embodiment 4 is substantially the same as Embodiment 3, except that:

[0053] A hydraulic pipeline flushing and oil temperature control system, the water outlet of a water pump 18 is connected to the water inlet of a high-level water tank 14 via a stop valve 19, the water outlet of the high-level water tank 14 is connected to the cooler 3 via the R1 end, the water inlet of the water pump 18 is connected to the cooler 3 via the R2 end via two stop valves 20, a heater 15 is arranged between the two stop valves 20 and the cooler 3, a temperature sensor 13 is installed on the flushing oil tank 1, the opening and closing of a stop valve 19 controls the liquid level of the high-level water tank 14, when the liquid level of the high-level water tank 14 is low, the stop valve 19 is opened, and tap water is injected into the high-level water tank 14 through the water pump 18; the opening and closing of the two stop valves 20 controls whether tap water is directly injected into the heater 15 through the water pump 18.

[0054] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A hydraulic pipeline flushing and oil temperature control system, characterized in that The hydraulic pipeline flushing and oil temperature control system comprises a flushing oil tank (1), a pressure control valve group (4), an oil inlet main pipe (7), a heating valve group (8), an oil return main pipe (9) and a water pump (18); The oil outlet of the flushing oil tank (1) is connected to the oil inlet of the pressure control valve group (4), the oil outlet of the pressure control valve group (4) is connected to the oil inlet of a hydraulic pump group (5), the hydraulic pump group (5) is connected to a motor (16), the oil inlet of the flushing oil tank (1) is connected to the oil outlet of a butterfly valve (17), a travel limit switch (17.1) is provided between the oil outlet of the butterfly valve (17) and the oil inlet of the hydraulic pump group (5), two check valves (10) are provided between the oil outlet of the hydraulic pump group (5) and the oil circuit of the oil inlet main pipe (7), a safety valve (6) is provided between the oil inlet main pipe (7) and the oil circuit of the flushing oil tank (1), the oil outlet of the oil inlet main pipe (7) is connected to the oil inlet of the oil return main pipe (9), and a heating valve group (8) is provided between the oil inlet main pipe (7) and the oil circuit of the oil return main pipe (9); Two groups of return oil filters (2) are installed in the flushing oil tank (1), a cooler (3) and eleven one-way valves (12) are arranged between the return oil main pipe (9) and the oil circuit of the flushing oil tank (1), the water outlet of the water pump (18) is connected to the water inlet of the high-level water tank (14) via a stop valve (19), the water outlet of the high-level water tank (14) is connected to the cooler (3) via the R1 end, the water inlet of the water pump (18) is connected to the cooler (3) via the R2 end via two stop valves (20), a heater (15) is arranged between the two stop valves (20) and the cooler (3), and a temperature sensor (13) is installed on the flushing oil tank (1).

2. A hydraulic pipeline flushing and oil temperature control system according to claim 1, characterized in that: A one-way valve (11) is provided between the flushing oil tank (1) and the oil circuit of the pressure control valve group (4).

3. A hydraulic pipeline flushing and oil temperature control system according to claim 1, characterized in that: The oil outlet end of the pressure control valve group (4) is connected to the oil inlet end of the second hydraulic pump group (5.1), and the oil outlet end of the pressure control valve group (4) is connected to the oil inlet end of the third hydraulic pump group (5.2). The structures of the first hydraulic pump group (5), the second hydraulic pump group (5.1) and the third hydraulic pump group (5.2) are the same.

4. A hydraulic pipeline flushing and oil temperature control system according to claim 3, characterized in that: The pressure control valve group (4) comprises a proportional relief valve (4.1), the oil outlet end of the flushing oil tank (1) is connected to the oil inlet end of the proportional relief valve (4.1), the oil outlet end of the proportional relief valve (4.1) is connected to the oil inlet end of a throttling stop valve (4.2), and the oil outlet end of the throttling stop valve (4.2) is connected to the oil inlet main pipe (7) via the C1 end.

5. A hydraulic pipeline flushing and oil temperature control system according to claim 4, characterized in that: A filter (4.3) is provided between the throttling stop valve (4.2) and the oil circuit at the C1 end, a pressure difference indicator (4.4) is provided on the filter (4.3), the oil outlet end of the flushing oil tank (1) is connected to the oil inlet end of the pilot relief valve (4.5), and the oil outlet end of the pilot relief valve (4.5) is connected to the oil inlet main pipe (7) via the C1 end.

6. A hydraulic pipeline flushing and oil temperature control system according to claim 4, characterized in that: The pressure control valve group (4) further comprises an electromagnetic reversing valve (4.6), a second electromagnetic reversing valve (4.7) and a third electromagnetic reversing valve (4.8); the oil outlet of the flushing oil tank (1) is connected to the oil inlet of the electromagnetic reversing valve (4.6); the oil outlet of the electromagnetic reversing valve (4.6) is connected to the oil inlet of the fifth check valve (4.61); the oil outlet of the fifth check valve (4.61) is connected to the oil inlet main pipe (7) via the C1 end; the oil outlet of the flushing oil tank (1) is connected to the oil inlet of the second electromagnetic reversing valve (4.7); The oil inlet end is connected, the oil outlet end of the second electromagnetic reversing valve (4.7) is connected to the oil inlet end of the sixth check valve (4.71), the oil outlet end of the sixth check valve (4.71) is connected to the second hydraulic pump group (5.1) through the C2 end, the oil outlet end of the flushing oil tank (1) is connected to the oil inlet end of the third electromagnetic reversing valve (4.8), the oil outlet end of the third electromagnetic reversing valve (4.8) is connected to the oil inlet end of the seventh check valve (4.81), and the oil outlet end of the seventh check valve (4.81) is connected to the third hydraulic pump group (5.2) through the C3 end.

7. A hydraulic pipeline flushing and oil temperature control system according to claim 1, characterized in that: The P1 end of the heating valve group (8) is connected to the oil inlet main pipe (7), and the T1 end of the heating valve group (8) is connected to the oil return main pipe (9).

8. A hydraulic pipeline flushing and oil temperature control system according to claim 7, characterized in that: The heating valve group (8) comprises two throttling stop valves (8.1), the oil outlet end of the oil inlet main pipe (7) is connected to the oil inlet end of the second throttling stop valve (8.1) via the P1 end, the oil outlet end of the second throttling stop valve (8.1) is connected to the oil inlet end of the return oil main pipe (9) via the first throttling hole (8.2) through the T1 end, the oil outlet end of the second throttling stop valve (8.1) is connected to the oil inlet end of the return oil main pipe (9) via the second throttling hole (8.3) through the T1 end, and the oil outlet end of the second throttling stop valve (8.1) is connected to the oil inlet end of the return oil main pipe (9) via the third throttling hole (8.4) through the T1 end.

9. A hydraulic pipeline flushing and oil temperature control system according to claim 8, characterized in that: Nine check valves (8.6) are provided between the second throttle stop valve (8.1) and the oil circuit at the P1 end, and eight check valves (8.5) are provided between the first throttle hole (8.2), the second throttle hole (8.3), the third throttle hole (8.4) and the oil circuit at the T1 end.

10. A hydraulic pipeline flushing and oil temperature control system according to claim 1, characterized in that: The oil return filter (2) comprises two filters (2.1), two pressure difference indicators (2.2) and ten one-way valves (2.3); the two filters (2.1) are connected to the oil return main pipe (9); the oil outlet end of the oil return main pipe (9) is connected to the oil inlet end of the ten one-way valves (2.3).

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