CN102966641B - Hydraulic system high-low pressure is combined online circulation flushing and pressure testing device - Google Patents
Hydraulic system high-low pressure is combined online circulation flushing and pressure testing device Download PDFInfo
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Abstract
The invention discloses a kind of hydraulic system high-low pressure and be combined online circulation flushing and pressure testing device, first and second ball valve series connection, first ball valve input connects fuel tank, outfan connects big flow low pressure screw flushing pump input, second ball valve outfan connects small flow high pressure plunger flushing pump input, small flow high pressure plunger flushing pump outfan is sequentially connected in series high pressure check valve and high-pressure outlet ball valve, high-pressure overflow valve connects high pressure check valve outfan and fuel tank, filter connects low pressure oil return ball valve and fuel tank, high pressure release valve ball connects high pressure check valve outfan and filter input, big flow low pressure screw flushing pump outfan is sequentially connected in series spin-up check-valves and low tension outlet ball valve, low pressure release valve ball connects spin-up check-valves outfan and filter input.The convenient hydraulic system of implementing of this device is rinsed and pressure testing, meets the flushing of big flow low-pressure, the flushing of small flow high pressure power and the requirement of pressure testing simultaneously, improves hydraulic system and rinse and pressure testing efficiency, reduce cost.
Description
Technical field
The present invention relates to a kind of hydraulic system high-low pressure and be combined online circulation flushing and pressure testing device.
Background technology
Along with being continuously increased of modern industry automaticity, hydraulic pressure drive control system accuracy and sensitivity is more and more higher, and therefore high sensitivity and high-precision hydraulic servo ratio system are used widely.As the pipeline of pumped (conveying) medium in hydraulic system such as the blood vessel of human body, in the quality of its construction and installation quality, pipeline, clean-up performance directly affects sensitivity and the precision of hydraulic system, even directly affects the properly functioning of hydraulic system.
Hydraulic System Construction needs after completing to carry out system flush, conventional flush device can only provide big flow low-pressure cannot meet high pressure requirement, low discharge low-pressure maybe can only be provided to be unable to reach high pressure requirement, and therefore cannot meet scene is actually needed, and cannot be carried out system pressure test.
The on-the-spot requirement for flusher can be summarized simply as follows: 1, big flow low-pressure flusher is responsible for for the big specification of flushing of hydraulic system；2, low discharge low-pressure flusher is used for rinsing short distance tubule；3, small flow high pressure power flusher for flushing valve platform to the arm before actuator and other distance tubule；4, small flow high pressure power is used for carrying out system pressure testing.
Big flow (1000L/min) low-pressure (the highest 4MPa) flusher can meet supervisor and rinse big traffic requirement.But when rinsing A, B pipeline after the valve platform that workload is very big, caliber is little, path length, on-way resistance are big, the flow of this flusher supply just residue, and the pressure supplied can not meet the requirement (flushing pressure typically requires to reach 4-12 MPa) of system flush, the rinsing quality of system therefore cannot be ensured.
It is not enough that low discharge (600L/min) low-pressure (the highest 1.6MPa) flusher rinses main conduit flow, time after flushing valve platform to A, B pipe before actuator, and in most cases insufficient pressure, it is impossible to meet the requirement of system flush.
A, B pipe flow amount residue after big flow (1000L/min) high pressure (the highest 16MPa) flusher flushing valve platform；Flushing pressure can meet operating mode, but flusher volume is too big, to such an extent as to often beyond original system pumping plant volume, and on-the-spot transport, handling, dismounting are the most inconvenient, and even flushing scene often cannot be put；And electric control system is complicated, equipment easily damages, and flusher power is too big, and conventional construction power supply cannot meet and starts flushing pump simultaneously, uses, transports, cost is high, energy consumption big for maintenance etc., and pressure testing inconvenience.
The problem that big flow low-pressure flusher, big-flow high-pressure power flusher solve the online circulation flushing of pipeline, can guarantee that the cleannes requirement in NAS7 level of pipeline, but require to be difficult to ensure to the cleannes of hydraulic proportional servosystem NAS5 level, often need to be realized by flushing for a long time, waste time and energy, increase energy consumption.
Therefore conventional flush device cannot meet the needs such as modern construction fast pace, the duration is short, labor intensity is low, cost is low.And all cannot or inconvenience meet hydraulic system pressure testing inspection, in the case of not using this pump of hydraulic system to carry out system pressure testing, just need to separately put pressure testing device enforcement pressure testing, thereby increase system construction cost, reduce the efficiency of construction of system.
Summary of the invention
The technical problem to be solved is to provide a kind of hydraulic system high-low pressure and is combined online circulation flushing and pressure testing device, the convenient online circulation flushing implementing hydraulic system of this device and system pressure testing, meet the big flow low-pressure flushing of hydraulic system, small flow high pressure power is rinsed and the requirement of system pressure testing simultaneously, improve hydraulic system to rinse and the efficiency of pressure testing, reduce cost.
nullFor solving above-mentioned technical problem，Present hydraulic system high-low pressure is combined online circulation flushing and pressure testing device includes big flow low pressure screw flushing pump、Small flow high pressure plunger flushing pump、Fuel tank、High pressure check valve、High-pressure overflow valve、High-pressure outlet ball valve、High pressure release valve ball、Spin-up check-valves、Low pressure release valve ball、Low tension outlet ball valve、Filter、Low pressure oil return ball valve、First ball valve and the second ball valve，Described first ball valve and the second ball valve are connected in series，The input of described first ball valve connects described fuel tank，The outfan of described first ball valve connects the input of described big flow low pressure screw flushing pump，The outfan of described second ball valve connects the input of described small flow high pressure plunger flushing pump，Described small flow high pressure plunger rinses delivery side of pump and is sequentially connected in series described high pressure check valve and high-pressure outlet ball valve，Described high-pressure overflow valve inputs、Outfan connects described high pressure check valve outfan and fuel tank respectively，Described filter outfan connects described fuel tank，Described low pressure oil return ball valve outfan connects described filter input，Described high pressure release valve ball inputs、Outfan connects described high pressure check valve outfan and filter input respectively，Described big flow low pressure screw flushing pump outfan is sequentially connected in series described spin-up check-valves and low tension outlet ball valve，Described low pressure release valve ball inputs、Outfan connects described spin-up check-valves outfan and filter input respectively.
Further, this device also includes that automatic sender liquidometer, the input of described automatic sender liquidometer, outfan connect the upper and lower of described fuel tank respectively by valve.
Further, this device also includes that thermometer and visual liquidometer, described thermometer and visual liquidometer are respectively arranged on the tank wall of described fuel tank.
Further, this device also includes the first Pressure gauge and the second Pressure gauge, described high pressure check valve and spin-up check-valves outfan are respectively equipped with oil circuit hole, and described first Pressure gauge and the second Pressure gauge are respectively arranged on oil circuit hole and the oil circuit hole of spin-up check-valves outfan of high pressure check valve outfan.
Further, this device also includes that the 3rd Pressure gauge, described filter input are provided with oil circuit hole, and the oil circuit hole of described filter input is located at by described 3rd Pressure gauge.
Further, this device also includes that heater, described heater are located in described fuel tank.
nullIt is combined online circulation flushing due to present hydraulic system high-low pressure and pressure testing device have employed technique scheme，I.e. first ball valve and the second ball valve are connected in series，The input of the first ball valve connects fuel tank，The outfan of the first ball valve connects the input of big flow low pressure screw flushing pump，The outfan of the second ball valve connects the input of small flow high pressure plunger flushing pump，Small flow high pressure plunger rinses delivery side of pump and is sequentially connected in series high pressure check valve and high-pressure outlet ball valve，High-pressure overflow valve inputs、Outfan connects high pressure check valve outfan and fuel tank respectively，Filter outfan connects fuel tank，Low pressure oil return ball valve outfan connects filter input，High pressure release valve ball inputs、Outfan connects high pressure check valve outfan and filter input respectively，Big flow low pressure screw flushing pump outfan is sequentially connected in series spin-up check-valves and low tension outlet ball valve，Low pressure release valve ball inputs、Outfan connects spin-up check-valves outfan and filter input respectively.The convenient online circulation flushing implementing hydraulic system of this device and system pressure testing, meet the big flow low-pressure flushing of hydraulic system, the flushing of small flow high pressure power and the requirement of system pressure testing simultaneously, improves hydraulic system and rinses and the efficiency of pressure testing, reduces cost.
Accompanying drawing explanation
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings:
Fig. 1 is that present hydraulic system high-low pressure is combined online circulation flushing and pressure testing device principle schematic.
Detailed description of the invention
nullAs shown in Figure 1，Present hydraulic system high-low pressure is combined online circulation flushing and pressure testing device includes big flow low pressure screw flushing pump 10、Small flow high pressure plunger flushing pump 20、Fuel tank 30、High pressure check valve 21、High-pressure overflow valve 22、High-pressure outlet ball valve 24、High pressure release valve ball 23、Spin-up check-valves 11、Low pressure release valve ball 12、Low tension outlet ball valve 13、Filter 31、Low pressure oil return ball valve 32、First ball valve 15 and the second ball valve 26，Described first ball valve 15 and the second ball valve 26 are connected in series，The input of described first ball valve 15 connects described fuel tank 30，The outfan of described first ball valve 15 connects the input of described big flow low pressure screw flushing pump 10，The outfan of described second ball valve 26 connects the input of described small flow high pressure plunger flushing pump 20，The outfan of described small flow high pressure plunger flushing pump 20 is sequentially connected in series described high pressure check valve 21 and high-pressure outlet ball valve 24，Described high-pressure overflow valve 22 inputs、Outfan connects described high pressure check valve 21 outfan and fuel tank 30 respectively，Described filter 31 outfan connects described fuel tank 30，Described low pressure oil return ball valve 32 outfan connects described filter 31 input，Described high pressure release valve ball 23 inputs、Outfan connects described high pressure check valve 21 outfan and filter 31 input respectively，Described big flow low pressure screw flushing pump 10 outfan is sequentially connected in series described spin-up check-valves 11 and low tension outlet ball valve 13，Described low pressure release valve ball 12 inputs、Outfan connects described spin-up check-valves 11 outfan and filter 31 input respectively.
Further, this device also includes automatic sender liquidometer 33, and the input of described automatic sender liquidometer 33, outfan connect the upper and lower of described fuel tank 30 respectively by valve 38.Automatically sender liquidometer monitors oil tank liquid level and by the control system of automatic for liquid level information sender to this device, it is simple to the control of native system.
Further, this device also includes that thermometer 34 and visual liquidometer 35, described thermometer 34 and visual liquidometer 35 are respectively arranged on the tank wall of described fuel tank 30.Thermometer and visual liquidometer are monitored fuel tank oil temperature and liquid level in real time and make instruction directly perceived, it is simple to operator grasp fuel tank oil temperature and liquid level in time.
Further, this device also includes the first Pressure gauge 25 and the second Pressure gauge 14, described high pressure check valve 21 and spin-up check-valves 11 outfan are respectively equipped with oil circuit hole, and described first Pressure gauge 25 and the second Pressure gauge 14 are respectively arranged on oil circuit hole and the oil circuit hole of spin-up check-valves 11 outfan of high pressure check valve 21 outfan.First Pressure gauge and the second Pressure gauge can detect small flow high pressure plunger flushing pump and the output pressure of big flow low pressure screw flushing pump respectively, and for judging the working condition of pump, oil circuit hole can be additionally used in fluid sampling simultaneously, analyzes the cleannes of fluid.
Further, this device also includes that the 3rd Pressure gauge 37, described filter 31 input are provided with oil circuit hole, and the oil circuit hole of described filter 31 input is located at by described 3rd Pressure gauge 37.3rd Pressure gauge is used for detecting return pressure, and to judge plugged filter situation, also can sample fluid in oil circuit hole, be used for analyzing developing result.
Further, this device also includes that heater 36, described heater 36 are located in described fuel tank.Heater is used for heating fuel tank inner fluid temperature, especially adapts to the flushing operation in winter, to improve developing result.
The big flow low pressure screw flushing pump of this device and small flow high pressure plunger flushing pump share suction inlet pipeline section and the oil return system of fuel tank, and independent externally output in parallel, thus to be rinsed to outside respectively as single unit system or treat the hydraulic system pipeline fuel feeding of pressure testing.The low-pressure state of small flow high pressure plunger flushing pump can run with big flow low pressure screw flushing pump simultaneously simultaneously, also can export with two pump discharge sums, it is provided that the low-pressure washing oil sources of greater flow the most simultaneously.
This device operation principle is divided into low-pressure section, high-pressure section and system pressure testing part,
Low-pressure section:
Fluid is after fuel tank is exported by big flow low pressure screw flushing pump, one tunnel provides big flow low-pressure washing oil sources through spin-up check-valves and low tension outlet ball valve to outside, another road is through low pressure release valve ball, the bypass circulation of fuel tank is backed into after filter, arranging of low pressure release valve ball facilitates outside safe fuel feeding, rinse initial, the sealing reliability of pipeline to be rinsed is the most uncertain, now low pressure release valve ball is opened to maximum, then rinse oil sources output flow minimum, major part fluid inputs fuel tank through bypass circulation, and fraction fluid outwards exports, consequently facilitating check the leakage of oil situation of pipeline to be rinsed, guarantee equipment and the safety of personnel, leakage is avoided to cause a large amount of fluid to lose；After checking No leakage, slowly turn down low pressure release valve ball, then rinse oil sources output flow and progressively close off along with bypass circulation and increase, during this period as occurred the leakage of oil can also quick control, i.e. close low tension outlet ball valve, fully open bypass circulation, make fluid all flow into fuel tank.In flushing process, can slowly closing bypass circulation, until it reaches the flushing flow rate of requirement, enter stable state and rinse, this process effectively reduces energy consumption.Additionally bypass circulation fluid inputs fuel tank through filter, serves the effect of circulating filtration.By high-pressure outlet ball valve and low tension outlet ball valve Close All in this device, high pressure release valve ball and low pressure release valve ball are fully open, now fuel tank fluid the most outwards supplies, and fluid returns to fuel tank through filter after two the pump outputs of this device, and the most whole device enters circulating filtration mode operation.According to design, even if fuel tank is filled it up with, average five minutes just can by the oil filtrating in fuel tank one time, this be at the scene very useful be also the functionality advantage not available for conventional flush device.Because during scene is refueled for fuel tank before flushing, fluid is often polluted, or rinse the product of inferior quality of fluid own, the pipeline causing often appearance has rinsed operation and has completed, but the oil cleanliness detected is the most defective, and makes flushing constantly carry out, and seriously reduces flush efficiency, and energy resource consumption ceaselessly increases, this is frequently encountered by the scene.This device is provided with bypass and filters, serve the effect of the circulating filtration unit the same with formal Hydraulic Station, this device does not has independent circulating filtration unit, the function of circulating filtration can be realized again, ensure that equipment safety, improve flush efficiency, greatly reduce energy consumption simultaneously, there is bigger economic benefit.
What fluid first passed around after big flow low pressure screw flushing pump exports is spin-up check-valves, and its effect is to prevent fluid from flowing backwards and altering oil.Because high-low pressure is simultaneously to hydraulic system pipeline to be rinsed fuel feeding, when outside, the interim loop configuration of flushing is unreasonable, or the when of maloperation, although big flow low pressure screw flushing pump and small flow high pressure plunger flushing pump work alone, it is likely that small flow high pressure plunger flushing pump rinses when, big flow low pressure screw flushing pump produces fluid flow backwards and alter oil situation, be now dangerous to big flow low pressure screw flushing pump, it is therefore necessary to this spin-up check-valves is set.Fluid is after spin-up check-valves, by the outside fuel feeding of low tension outlet ball valve；This device mesolow vent ball valve can use the ball valve of three kinds of different sizes to be connected in parallel, so according to on-the-spot different hydraulic system, it is possible to it is suitable for different pipeline specifications, or opens to ensure pipeline drift diameter sum simultaneously, reduce local resistance loss, improve the flexibility of low-pressure washing.After fluid is exported by low tension outlet ball valve, realize rinsing through being rinsed the circulation of pipeline.
High-pressure section:
Fluid is after fuel tank is exported by small flow high pressure plunger flushing pump, first pass around check valve, the effect of check valve is to avoid fluid to flow backwards to damage equipment, after through high-pressure outlet ball valve export, check valve outfan arranges the high-pressure overflow valve of connection fuel tank, the effect of high-pressure overflow valve is the maximum working pressure setting small flow high pressure plunger flushing pump, small flow high pressure plunger flushing pump is provided effectively protection, if i.e. high-pressure outlet ball valve shuts, before outlet the most now, pressure is the pressure that high-pressure overflow valve sets, during overflow situation, fluid returns to fuel tank after being converged by high-pressure overflow valve entrance leakage line the blow-by tube with small flow high pressure plunger flushing pump.
Equally, small flow high pressure plunger flushing pump is provided with bypass circulation, i.e. high pressure release valve ball connects high-pressure overflow valve outfan and filter input respectively.Its effect is similar to low pressure release valve ball, it is simple to convenient and safe control output flow, high pressure release valve ball opening is the least, then export the biggest；When just starting to rinse, high pressure release valve ball is opened to maximum, checks pipe-loop to be rinsed, and leakage, does not gradually turn down high pressure release valve ball, to increase output flushing flow rate, until rinsing into compliance with the stable state required.High pressure release valve ball is also used for the circulating filtration of fluid simultaneously.It addition, high pressure release valve ball can be additionally used in auxiliary heating, when high-pressure overflow valve suitably turns down setting pressure, high-pressure outlet ball valve all shuts, high pressure bypass circulation is half-open according to practical situation, forms certain pressure, such as about 10Bar, form recurrent state, now, owing to local resistance loss produces heating, can be with the temperature being heated rapidly to scouring media be suitable for of efficient energy-saving, thus improving developing result, it is particularly suitable for the flushing operation in winter；High pressure release valve ball can be additionally used in system decompression, after hydraulic system high pressure pressure testing completes, pipe interior still remaining remains at a relatively high residual pressure, often occurring in practice because residual voltage does not unloads in pipe, causing operating personnel's personal injury, now this device only need to open high pressure release valve ball in the past, just can quickly and easily the pressure within tested pipeline be laid down rapidly, tested pipeline fluid backs into fuel tank through high pressure release valve ball, filter, not pipe external leakage, saves fluid and safe and efficient.
Normal when rinsing operation, high pressure release valve ball cuts out, fluid through check valve to high-pressure outlet ball valve, the oil circuit hole of pressure tap is installed on this oil circuit simultaneously, oil circuit hole connects pressure gauge, can conveniently detect pump discharge pressure, and available this oil circuit hole detection oil cleanliness.If fuel tank inner fluid is dirtier, above-mentioned circulating filtration can be entered to clean fluid.High-pressure outlet ball valve arranges two high-pressure outlet ball valves of the different size being connected in parallel depending on hydraulic system pipeline.Through high-pressure outlet ball valve, fluid enters pipe-loop to be rinsed or makees hydraulic system pressure testing.
The oil return of pipe-loop to be rinsed enters fuel tank after low pressure oil return ball valve inflow filter, can arrange two each and every one pressure taps before filter, one conveniently draws oil sample detection cleannes, its two convenient detection return pressure, judge blocking state of filter, it is ensured that equipment safety.
This device is additionally provided with automatic sender liquidometer, when oil tank liquid level is in and sets minimum, and termination of pumping of interlocking；Heater also can be set in fuel tank, this heater to being in low ambient temperature, does not reaches and requires that the scouring media of temperature heats together with cycle of higher pressure flowing heating, the oil liquid temperature of temperature transmitter detection simultaneously, once meet rinsing requirement i.e. stop heating, thermo-field thoery then interlock termination of pumping cooling.
Hydraulic system pressure testing:
Big flow low pressure screw rinses air pump inoperative, and its outlet all shuts.When pressure testing is initial, high-pressure overflow valve pine is the most maximum, i.e. setting pressure is minimum, and high pressure release valve ball is opened to maximum, and high-pressure outlet ball valve is opened, and starts small flow high pressure plunger flushing pump.Now check that hydraulic system treats pressure testing pipeline, as all gone well, high pressure release valve ball slowly turns down, until completely closing, the most slowly tightening high-pressure overflow valve makes setup pressure value slowly increase, and pressure is gradually increasing until test pressure be increased to Strengh testing pressure according to specification；After strength test completes, adjust high-pressure overflow valve and be down to hydraulic system working pressure, close high-pressure outlet ball valve, stop small flow high pressure plunger flushing pump, observe hydraulic system and treat pressure testing pipeline packing state, just can easily enter leak test.After pressure testing completes, slowly adjusting pine overflow valve to make setting value reduce, then open high pressure release valve ball, lay down and treat pressure testing pipeline residual voltage, pressure testing terminates.
This device can be made into modular construction, so that the flexible Application rinsed, convenient transport, installation and upkeep operation, small flow high pressure plunger flushing pump and valve block oil circuit constitute high-pressure modular, big flow low pressure screw flushing pump and valve block oil circuit and constitute low-voltage module, and fuel tank, filter and oil return valve block constitute utility module, high-pressure modular and low-voltage module are combined with utility module respectively and can use respectively, also can use simultaneously, while improving motility, also effectively reduce the energy consumption of this device.
This device meets that hydraulic system big flow low-pressure rinses, small flow high pressure power is rinsed, system pressure testing realize oil circulation and filter, circulate heating, avoid every demand of operation process oil liquid leakage, there is multiple function, facilitate again every kind of operation simultaneously, this does not has at conventional flush device, thus the commonly used ability in scene greatly improving this device, improve hydraulic system to rinse and pressure testing efficiency, reduce cost, reach good energy-saving and cost-reducing effect.
Claims (6)
- null1. a hydraulic system high-low pressure is combined online circulation flushing and pressure testing device，It is characterized in that: this device includes big flow low pressure screw flushing pump、Small flow high pressure plunger flushing pump、Fuel tank、High pressure check valve、High-pressure overflow valve、High-pressure outlet ball valve、High pressure release valve ball、Spin-up check-valves、Low pressure release valve ball、Low tension outlet ball valve、Filter、Low pressure oil return ball valve、First ball valve and the second ball valve，Described first ball valve and the second ball valve are connected in series，The input of described first ball valve connects described fuel tank，The outfan of described first ball valve connects the input of described big flow low pressure screw flushing pump，The outfan of described second ball valve connects the input of described small flow high pressure plunger flushing pump，Described small flow high pressure plunger rinses delivery side of pump and is sequentially connected in series described high pressure check valve and high-pressure outlet ball valve，Described high-pressure overflow valve inputs、Outfan connects described high pressure check valve outfan and fuel tank respectively，Described filter outfan connects described fuel tank，Described low pressure oil return ball valve outfan connects described filter input，Described high pressure release valve ball inputs、Outfan connects described high pressure check valve outfan and filter input respectively，Described big flow low pressure screw flushing pump outfan is sequentially connected in series described spin-up check-valves and low tension outlet ball valve，Described low pressure release valve ball inputs、Outfan connects described spin-up check-valves outfan and filter input respectively.
- Hydraulic system high-low pressure the most according to claim 1 is combined online circulation flushing and pressure testing device, it is characterized in that: this device also includes that automatic sender liquidometer, the input of described automatic sender liquidometer, outfan connect the upper and lower of described fuel tank respectively by valve.
- Hydraulic system high-low pressure the most according to claim 1 is combined online circulation flushing and pressure testing device, it is characterised in that: this device also includes that thermometer and visual liquidometer, described thermometer and visual liquidometer are respectively arranged on the tank wall of described fuel tank.
- Hydraulic system high-low pressure the most according to claim 1 is combined online circulation flushing and pressure testing device, it is characterized in that: this device also includes the first Pressure gauge and the second Pressure gauge, described high pressure check valve and spin-up check-valves outfan are respectively equipped with oil circuit hole, and described first Pressure gauge and the second Pressure gauge are respectively arranged on oil circuit hole and the oil circuit hole of spin-up check-valves outfan of high pressure check valve outfan.
- Hydraulic system high-low pressure the most according to claim 1 is combined online circulation flushing and pressure testing device, it is characterized in that: this device also includes the 3rd Pressure gauge, described filter input is provided with oil circuit hole, and the oil circuit hole of described filter input is located at by described 3rd Pressure gauge.
- Hydraulic system high-low pressure the most according to claim 1 is combined online circulation flushing and pressure testing device, it is characterised in that: this device also includes that heater, described heater are located in described fuel tank.
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| CN201586653U (en) * | 2009-12-11 | 2010-09-22 | 广州市阿盖特科技有限公司 | Multifunctional combination device with pipeline flushing, pressure test and load test functions |
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| CN108518388A (en) * | 2018-03-05 | 2018-09-11 | 杭州电子科技大学 | A kind of multifunction hydraulic cleaning filtering vehicle |
| CN108518388B (en) * | 2018-03-05 | 2019-11-05 | 杭州电子科技大学 | A kind of multifunction hydraulic cleaning filtering vehicle |
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