A large-scale walk-in combined dynamic and static seawater corrosion test system for vehicles

Abstract

The invention discloses a large-scale walk-in dynamic and static combined seawater corrosion test system for vehicles, comprising a test chamber body, a dynamic test device and a static test device, wherein the dynamic test device comprises a spray module and a splash module, and the static test device comprises a sealing structure of the spray module and the test chamber body; the sealing structure of the test chamber body comprises a chamber frame and a membrane cloth, and water retaining walls and the chamber frame are arranged on both sides of the length direction of the test chamber body; the membrane cloth covers the outside of the chamber frame, and opening and closing doors are arranged at the front and rear ends of the chamber body, and the side and bottom edges of the door frame of the opening and closing door are arranged with rubber strips and the top and bottom are arranged with locking mechanisms, and the rest of the membrane structure is sealed; a mounting hole is reserved inside the chamber frame, and the mounting hole is connected to the mounting frame, and the spray module, the spray module and the splash module are fixed on the mounting frame; a water supply module and a control system are also included.

Description

Technical Field

[0001] The invention relates to the field of equipment testing, and in particular to a dynamic and static combined testing system and method for a vehicle in an atmospheric and seawater corrosive environment. Background Art

[0002] Chinese patent CN114577711A discloses "a dynamic water environment natural acceleration test device and control system", and specifically discloses the following content: "a dynamic water environment natural acceleration test device, including a dynamic water supply system, a spray system, a rotation system, a splash system, a lifting system and a drying system; the lifting system supports the rotation system to rise and fall; the dynamic water supply system includes a test pool; the spray system and the rotation system are located above the test pool; the drying system is arranged on one side or both sides of the test pool; the splash system is arranged on one side or both sides of the test pool. The dynamic water can be dynamic seawater. By adopting the above method, the spraying, splashing, immersion and other simulations of seawater can be performed on the test sample or the whole machine, and then drying can be performed, which fully simulates the working conditions faced by the test piece or the whole machine in the marine atmospheric environment, can accelerate the corrosion of the test piece or the whole machine in the marine atmospheric environment, and can test the test piece in the marine atmospheric environment. The water supply system includes a manhole, which is connected to the filter tank through a pump, and the filter tank is connected to the test tank through a pump. The filter tank is also connected to the splash system and the spray system. The spray system includes two parallel longitudinal beams arranged above the test tank, and a plurality of transverse mounting rods are arranged between the two longitudinal beams. A spray pipe is arranged at the bottom of the mounting rod, and the spray pipe is provided with a plurality of nozzles opening downward. The test tank or rainwater tank is suitable for the whole vehicle to enter. The wheels of the whole vehicle drive the seawater to scour and infiltrate the chassis of the vehicle, accelerating the corrosion of the chassis. The spray system can spray the whole vehicle with seawater for corrosion, and the splash system can spray the whole vehicle with seawater for corrosion at the same time. In this way, the whole vehicle can be fully corroded. After that, the vehicle is driven out of the test tank and blown dry (drying system) to finally achieve the alternating corrosion effect of wave scouring / splashing-infiltration-drying, and finally the corrosion condition of the vehicle is checked. "

[0003] The defects in the above patents are: dynamic testing is mainly used for the whole machine test. The defects of dynamic testing are that the test time is limited, the test water droplets are not atomized water droplets, the particles are large, and there is not enough time to settle on the sample surface. The wetting area during the test is limited and it is difficult to penetrate into the interior of the vehicle. It may not be possible to fully evaluate the defects on the surface and interior of the vehicle. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a large-scale walk-in dynamic and static combined seawater corrosion test system, characterized in that: it includes a test chamber body, a dynamic test device and a static test device, the dynamic test device includes a spray module and a splash module, and the static test device includes a sealing structure of the spray module and the test chamber body; the sealing structure of the test chamber body includes a chamber frame and a membrane cloth, and retaining walls are arranged on both sides of the length direction of the test chamber body, and the retaining walls are pre-embedded with mounting studs. The chamber frame is welded by hot-dip galvanized square tubes, and the column of the chamber frame and the mounting studs are screwed with nuts, and the nuts are wrapped with protective covers and sealed with protective wax; the membrane cloth is made of PVC material and covers the outside of the chamber frame, and opening and closing doors are arranged at the front and rear ends of the chamber body, and the side and bottom edges of the door frame of the opening and closing door are provided with rubber strips and locking mechanisms are arranged at the top and bottom, and the rest of the membrane cloth is sealed; a mounting hole is reserved inside the chamber frame, and the mounting hole is connected to the mounting frame, and the spray module, the spray module and the splash module are fixed on the mounting frame; it also includes a water supply module and a control system.

[0005] The water supply module includes a seawater reservoir, a vacuum tank and a water pump; the seawater reservoir is arranged at the front end, rear end or side of the test chamber body, the seawater reservoir is located underground and a filter is arranged in the middle thereof, the filter divides the seawater reservoir into a clean seawater unit and a sedimentation filtration unit, and the seawater is introduced into the sedimentation filtration unit and then filtered by the filter and enters the clean seawater unit; the filter has three layers of filter screens, with grades of 100 mesh, 150 mesh and 200 mesh, respectively, which can block impurities with a diameter greater than 0.1 mm; the vacuum tank and the water pump are located on the ground, and a filter is arranged on the top of the vacuum tank. A water adding ball valve and an exhaust valve, a water suction pipe is arranged on the upper part of the vacuum tank, the water suction pipe extends from the upper part of the vacuum tank to the bottom of the vacuum tank, and the water suction pipe outside the tank is provided with a flange, and is connected to a water pumping pipe through the flange, and the water pumping pipe extends into the clean seawater unit in the seawater reservoir; a drain valve is arranged at the bottom of the vacuum tank, and the lower part of the vacuum tank is connected to the water suction port of the water pump through a pipeline, and an inlet valve is arranged on the pipeline; a water outlet pipe is arranged at the other end of the water pump, and the water outlet pipe is connected to the spray module, the spray module and the splashing module, and a water outlet check valve and a water outlet ball valve are arranged on the water outlet pipe.

[0006] The spray module includes an air supply unit arranged in the control chamber of the control system, and the air supply unit includes an air compressor, an air storage tank, a pressure reducing valve, a solenoid valve, an oil-water separator, a pressure regulating valve, an air saturator and a spray solenoid valve connected in sequence; the spray module also includes a spray water supply unit, and the spray water supply unit includes a secondary filter, a spray seawater tank and a spray water pump arranged in the control chamber, and the vacuum tank transports the seawater in the clean seawater unit in the seawater reservoir to the secondary filter for secondary filtration and then sends it to the spray seawater tank; the spray module also includes a spray execution unit, and the execution unit is located in the test chamber and fixed on the connecting frame. The execution unit includes two spray water inlet pipes arranged on the left and right along the length direction of the test chamber and two spray air inlet pipes arranged on the left and right, and the A spray tower is arranged on the spray water inlet pipe and the spray air inlet pipe, and a plurality of the spray towers are evenly arranged along the length direction. The spray towers are respectively connected to the spray water inlet pipe and the spray air inlet pipe through a hose, and the spray tower adopts a non-crystallization nozzle, and a baffle with an adjustable oblique angle is arranged at the nozzle position; the two spray air inlet pipes are connected to the air supply unit; the ends of the two spray water inlet pipes in the same direction are respectively connected to a balancing water tank, and a top water tank is arranged on the upper part between the two balancing water tanks, and the inlet of the top water tank is connected to the spray seawater tank through the spray water pump, and the two sides of the top water tank are respectively connected to the two balancing water tanks through pipelines; the spray module also includes a spray control unit, and the spray control unit includes a salt spray cabinet arranged in the control chamber body, and a sub-pressure regulating valve connected one-to-one with the main pressure regulating valve and the spray tower is arranged in the salt spray cabinet. The distance between the two spray water inlet pipes or the two spray air inlet pipes is 5700mm, the height from the ground is 4.0~4.1m, 26 sets of spray towers are arranged on each side, the spray outlet pressure is 0.07~0.14MPa, and the sedimentation rate of the spray module is 1~2mL / 80cm 2 ·h.

[0007] The spray module includes a spray water supply unit and a spray execution unit; the spray water supply unit includes a spray water pump, the spray water pump adopts frequency conversion control and is connected to the water supply pipeline of the vacuum tank; the spray execution unit is arranged in the test chamber body and fixed on the connecting frame, the spray execution unit includes a spray main water inlet pipeline and spray pipelines arranged horizontally on the left and right, the spray main water inlet pipeline is connected to the spray water pump, one end of the two spray pipelines in the same direction is connected to the spray main water inlet pipeline, the spray main water inlet pipeline is provided with a pressure sensor, and two spray pipes Control valves and pressure gauges are respectively provided on the channels. The diameter of the main water inlet pipe for spraying is twice that of the spray pipe. The spacing between the two spray pipes is 2m, and the lengths are both 13~14m. Nine nozzles are provided on each spray pipe, and the interval between two adjacent nozzles is 1.5m. The nozzles adopt PPR pressure-resistant nozzles, which can be rotated 90°, and the spray shape is a solid cone. The water outlet pressure of the nozzle is 500kPa, the spray flow rate is ≥2.5L / min, the nozzle nozzle diameter is φ3.5mm, and the spray droplet diameter is 0.5~4.5mm.

[0008] The splash module includes a splash pool unit and a side splash unit; the splash pool unit is a splash pool arranged on the ground inside the test chamber body, the length and width of the splash pool are consistent with the length and width of the internal dimensions of the test chamber body, and the depth of the splash pool is 400mm; and slopes are arranged at both ends of the water inlet and outlet of the splash pool; the side splash unit includes six splash pipes, three of which are arranged on the left and right sides respectively and the three on the same side are arranged vertically in parallel, the splash pipes are fixed on the connecting frame, the splash pipes on the left and right sides are 5300~5700mm apart, and the three splash pipes are 100mm high from the ground The lengths are 1m, 2.3m, and 3.6m respectively. The same end of the three splashing pipes on the left is connected to the left water supply pipe, and the same end of the three splashing pipes on the right is connected to the right water supply pipe, and the left water supply pipe and the right water supply pipe are both connected to the main splashing water inlet pipe, and the main splashing water inlet pipe is connected to the splashing water pump in the control room body; each splashing water pipe is provided with a splashing nozzle at intervals of 1m, and there are 78 splashing nozzles in total. The aperture of the splashing nozzle is 3.5mm, the spray shape is a solid cone, the spray pressure is ≥500kPa, the injection flow rate is ≥2.5L / min, and the splashing distance is ≥12m.

[0009] The large-scale walk-in dynamic and static combined seawater corrosion test system also includes a cleaning module, which includes a tap water tank arranged in the control room body, and the tap water tank is connected to a cleaning pipe, and the cleaning pipe is respectively connected to the top water tank of the spray module, the spray main water inlet pipe of the spray module, and the splash water main water inlet pipe of the splash water module; the cleaning module also includes a hand valve arranged at the end of the spray water inlet pipe, a hand valve at the end of the spray pipe, and a hand valve at the end of the splash water pipe; the cleaning module also includes a high-pressure cleaning spray gun arranged in the test room body, and the high-pressure cleaning spray gun is connected to the cleaning pipe.

[0010] The large-scale walk-in dynamic and static combined seawater corrosion test system also includes a test pavement auxiliary module, which includes a U-shaped circulation pavement, one side of which is a test channel, and the test chamber body is arranged in the middle of the test channel, and the pavement entrance section connected to the entrance end of the test channel and the pavement connected to the exit end of the test channel are the rotating pavement, and a section of the pavement connecting the rotating pavement and the entrance section is the return channel; the front end of the entrance section extends with an entrance road of the U-shaped circulation pavement, and the end of the return channel facing the rotating pavement extends with an exit road of the U-shaped circulation pavement.

[0011] A sewage recovery pool is arranged behind the rotating pavement of the U-shaped circulation pavement. The sewage recovery pool is located underground and is divided into an oil separator and a water storage tank. A test passage from the test laboratory body to the rotating pavement has a downward slope.

[0012] The present invention also provides a test method based on the above large-scale walk-in dynamic and static combined seawater corrosion test system, which is carried out in sequence according to the following steps:

[0013] The first step is to drive the vehicle to be tested onto the U-shaped circulation road surface, drive the vehicle into the test channel and into the test chamber and turn off the engine;

[0014] The second step is to close the front and rear doors of the test chamber, start the spray test mode, spray the vehicle to be tested, and the spray module sprays continuously in the test chamber so that the entire vehicle to be tested is diffused in seawater mist, and start the static seawater corrosion test;

[0015] The third step is to turn off the spray function, open the test chamber, drive the vehicle to be tested out of the test chamber, and return along the U-shaped circular road surface to pass through the test chamber again;

[0016] The fourth step is to turn on the spray and splash function and start the spray and splash test mode. When the vehicle passes, the test vehicle is sprayed and splashed with water. The spray is mainly used to wet the roof and the upper part of the vehicle body. The side splash unit of the splash module is mainly used to wet the two sides of the vehicle body. The splash pool is mainly used to wet the wheels and the frame.

[0017] The fifth step is to close the test system, clean the spray module, the shower module and the splash module, and use a spray gun to clean the inside of the test chamber.

[0018] The third and fourth steps can be repeated multiple times as required. Beneficial Effects

[0019] 1. Compared with the traditional salt spray test, the test system of the present invention can accelerate the corrosion of the simulated product in the hot and humid marine atmosphere and seawater environment by combining the test method with the appropriate test method. In the process of simulating the hot and humid marine atmosphere environment, the main corrosion components and factors can be retained, and the corrosion process of the product can be strengthened, which has both acceleration and simulation.

[0020] 2. The present invention adopts a test module that combines dynamic and static methods. The droplets are composed of larger spray droplets, splash droplets and extremely fine atomized particles. The test can be carried out on the surface, gaps and sealing defective parts of the test samples, which enhances the penetration effect of the test and truly restores the corrosion effect in actual use.

[0021] 3. The test system of the present invention can carry out tests in all directions and at multiple angles to ensure the coverage area and no dead angles of the test. The test system of the present invention is divided into three functional modules: spraying, showering, and splashing. Through seawater spraying and spraying in different directions and modes, the corrosion behavior of the simulated equipment in the marine atmosphere is accelerated in all directions and at multiple angles. The spray module adopts the airflow atomization principle to spray the test chamber body, and the sample carries out a static sea fog corrosion test under the state of seawater spray diffusion in the test chamber body. By introducing seawater to supply water to the spray and splashing pipelines, a water pump is used to apply pressure to the seawater nozzle to spray and splash water on the top and side of the static / moving sample respectively, accelerating the corrosion process of the simulated sample. The bottom of the test chamber body is a seawater splashing pool. The seawater splashed by the sample when passing through the splashing pool accelerates the simulation of seawater corrosion on the bottom of the sample and the hub part, thereby enhancing the coverage effect of the test and forming an all-round test of the sample.

[0022] 4. The test chamber body composed of the chamber frame + membrane cloth adopted in the present invention can realize open spraying and closed spraying, and can prevent rain, wind, solar radiation, avoid air convection, and improve the efficiency and authenticity of the test.

[0023] 5. The cleaning module of the present invention can clean the pipelines and the test chamber, and can also clean the vehicle after the test, which not only avoids the corrosion of the equipment by seawater, increases the life of the equipment, but also realizes the functional integration and multi-effect utilization of the equipment. At the same time, there is also a treatment device for the sewage after the test and cleaning, which filters the impurities and oil in the sewage before discharging it to avoid environmental pollution.

[0024] 6. The U-shaped circulation road surface designed by the present invention can realize that the vehicle to be tested can be driven into the test chamber for multiple cycles to perform dynamic tests. The U-shaped circulation road surface can also realize the acceleration and deceleration of the vehicle. The vehicle is accelerated to an appropriate speed before entering the laboratory, so that the spraying and splashing can achieve the expected effect. Multiple cycle dynamic tests can also enhance the test effect and achieve acceleration and simulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings of the present invention are as follows:

[0026] Figure 1 A structural diagram of a test road surface auxiliary module of the test system of the present invention;

[0027] Figure 2 It is a room frame structure diagram of the test system of the present invention;

[0028] Figure 3 It is a left side view of the chamber frame of the present invention;

[0029] Figure 4 A top view of a test chamber body and a control chamber body of a test system of the present invention;

[0030] Figure 5 It is a front view of the test chamber body and the control chamber body of the test system of the present invention;

[0031] Figure 6 It is a left side view of the test room body and the control room body of the test system of the present invention;

[0032] Figure 7 It is an axonometric diagram of the test room body and the control room body of the test system of the present invention;

[0033] Figure 8 It is a piping layout diagram of the spray module of the test system of the present invention;

[0034] Fig. 9 It is a schematic diagram of the spray module of the test system of the present invention;

[0035] Fig.10 A flow chart of a spray module of the test system of the present invention;

[0036] Fig.11 It is a piping layout diagram of the spray module of the test system of the present invention;

[0037] Fig.12 It is a piping layout diagram of the splash module of the test system of the present invention;

[0038] Fig.13 A control circuit diagram of a control system of the test system of the present invention;

[0039] Fig.14 A module structure diagram of a control system of the test system of the present invention;

[0040] Fig.15 This is a control function design diagram of the control system of the test system of the present invention. DETAILED DESCRIPTION

[0041] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be construed as limiting the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0042] Example 1: Figure 1-15 As shown, this embodiment provides a large-scale walk-in dynamic and static combined seawater corrosion test system, including a test chamber body and a control chamber body, and also includes a static test device and a dynamic test device. The dynamic test device includes a spray module and a splash module, and the static test device includes a spray module and a sealing structure of the test chamber body, and also includes a water supply module, a control system, a test pavement auxiliary module and a cleaning module.

[0043] (1) Test road auxiliary module of this embodiment

[0044] See also Figure 1 The test road surface auxiliary module includes a U-shaped circulating road surface, one side of the U-shaped circulating road surface is a test channel, the test chamber body is arranged in the middle of the test channel, the road surface connected to the driving-in end of the test channel is an entry section road surface, the road surface connected to the driving-out end of the test channel is a rotating road surface, and a section of road surface connecting the rotating road surface and the driving-in section road surface is a return channel; the front end of the driving-in section road surface is extended with an entry road of the U-shaped circulating road surface, and the end of the return channel facing the rotating road surface is extended with an exit road of the U-shaped circulating road surface.

[0045] In this embodiment, the entrance road, exit road and U-shaped circulation road surface are required to be able to bear a load of 50 tons, the entire length of the U-shaped circulation road surface is ≥150m, and the road surface / channel width is ≥5m.

[0046] (2) Regarding the laboratory structure of this embodiment

[0047] See also Figure 2 and 3 , the test chamber body of this embodiment is composed of a chamber frame 1 and a membrane cloth 2 arranged outside the chamber frame. Among them, the external dimensions of the test chamber body are: L×W×H (length×width×height) = (20000~21000) mm×(5700~6700) mm×(5000~5800) mm. As an option in this embodiment, the external dimensions of the test chamber body are selected as: L×W×H (length×width×height) = 20400mm×5700mm×5600mm. In addition, the top of the test chamber body in this embodiment is set as a gable roof, the height of the gable roof is 1100mm, and the space under the gable roof is a rectangular space with a height of 4500mm.

[0048] In addition, as an implementation method in this embodiment, a water retaining wall 3 arranged in the longitudinal direction is provided at both ends of the width direction of the test chamber body, the height of the water retaining wall is 400 mm, and the length of the water retaining wall is consistent with the length of the test chamber body. In addition to having the function of splash-proof and water-blocking, the water retaining wall also has pre-embedded mounting bolts in the water retaining wall. The chamber body frame is installed on the water retaining wall and is screwed with the pre-embedded bolts in the water retaining wall through nuts.

[0049] The chamber frame in the embodiment is hot-dip galvanized, and the main body connection is connected by rust-proof bolts. The mounting nuts connected between the chamber frame and the embedded bolts are protected by protective wax + protective cover.

[0050] The outside of the chamber structure is wrapped with a membrane cloth. The membrane cloth in this embodiment is PVC membrane cloth, which has the characteristics of strong toughness, high strength, and good environmental corrosion resistance.

[0051] The PVC membrane in this embodiment is painted gray, with a sealing design added to the edge. The chamber needs to be kept airtight when closed. There are rubber strips on both sides of the door frame, a rubber sheet is added to the bottom of the door frame, and locking devices are installed on the top and bottom to keep it airtight when locked, which can prevent ventilation or air convection at the connection seam to ensure the sealing of the membrane and the ground. The double-door design is adopted at both ends in the longitudinal direction to facilitate the entry and exit of the vehicle system.

[0052] In addition, a plurality of threaded holes are provided inside the chamber structure for threaded connection with a connecting frame, and the splashing module, the spray module and the shower module are installed on the connecting frame.

[0053] (3) Water supply module of this embodiment

[0054] See also Figure 4-7The water supply module in this embodiment is used to supply water to the splash module, the spray module and the mist module, and includes a seawater reservoir 4 and a delivery system. In this embodiment, the seawater reservoir is arranged at the tail end of the test chamber body. The seawater reservoir is arranged underground (below the ground level) and is an integral unit with a capacity of not less than 10m 3 , which is provided with a clean seawater unit 5 and a sedimentation filter unit 6, and the two are separated by a filter screen 7. The filter screen has an area of ​​1000*500mm, and uses a three-layer filter screen with filtering grades of 100 mesh, 150 mesh and 200 mesh, which can block sediments, suspended matter and impurities with a diameter greater than 0.1mm. During use, seawater is introduced into the sedimentation filter unit and filtered through the filter screen before entering the clean seawater unit.

[0055] A vacuum tank 8 and a water pump are provided beside the seawater reservoir. The vacuum tank and the water pump are located on the ground. A water filling ball valve and an exhaust valve are provided on the top of the vacuum tank. A water suction pipe is provided on the upper part of the vacuum tank. The water suction pipe extends from the upper part of the vacuum tank to the bottom of the vacuum tank. The water suction pipe outside the tank is provided with a flange and connected to a pumping pipe through the flange. The pumping pipe extends into the clean seawater unit in the seawater reservoir. A drain valve is provided at the bottom of the vacuum tank. The lower part of the vacuum tank is connected to the water suction port of the water pump through a pipeline. A water inlet valve is provided on the pipeline. A water outlet pipeline is provided at the other end of the water pump. The water outlet pipeline sends the purified seawater into the spray module, the spray module and the splash module. A water outlet check valve and a water outlet ball valve are provided on the water outlet pipeline.

[0056] The vacuum tank in this embodiment is made of thick-walled 316L stainless steel plate, which is rolled and welded to form a size of φ800*1200mm. The water pump is a centrifugal pump and adopts a frequency converter drive mode. The power is 11KW and the water supply flow is about 40m 3 / h, which can provide a pressure of no less than 500kPa for the nozzle at the end; the material of the water pump flow parts (including but not limited to the pump housing, impeller, pump shaft, etc.) is 316 stainless steel. The water supply pipelines are all made of pressure-resistant PPR pipes, the pump suction pipe is DN100 pipe, and a check valve is installed; the main water supply pipeline is DN100 pipe.

[0057] Before pumping water, the vacuum tank must be filled with water. When the water in the vacuum tank is sucked out by the water pump, negative pressure is generated in the vacuum tank. Due to the effect of atmospheric pressure, the water in the clean seawater unit of the seawater reservoir will continuously supply water to the spray module, the mist module and the splashing module through the water pump.

[0058] (4) Regarding the spray module in this embodiment

[0059] The control system of this embodiment includes a control chamber body 9, the control chamber body is arranged on the left or right side of the test chamber body.

[0060] See also Figure 4-10 The spray module includes an air supply unit 10 arranged in the control chamber body, and the air supply unit includes an air compressor, an air storage tank, a primary oil-water separator, a pressure reducing valve, a solenoid valve, a secondary oil-water separator, a pressure regulating valve, an air saturator and a spray solenoid valve connected in sequence. The ambient atmosphere is compressed into high-pressure air by the air compressor and then enters the air storage tank. The high-pressure air in the air storage tank passes through the oil-water separator for primary oil-water separation, and then passes through the pressure reducing valve for the first pressure reduction. The air pressure after pressure reduction is 0.2~0.3MPa. Then, it passes through the secondary oil-water separator for secondary oil-water separation, and then passes through the pressure regulating valve for secondary pressure regulation. The air pressure after pressure regulation is 0.07~0.14MPa. Finally, it enters the air saturator for filtration again and mixes with the water vapor in the air saturator, and finally becomes clean and moist gas and enters the terminal nozzle.

[0061] In this embodiment, in order to ensure that the air entering the nozzle is clean air, the gas generated by the compressor needs to be separated from oil and water twice. The primary oil-water separator is a circular pressure container containing activated carbon, clean stones, wool felt, diverter, sewage discharge interface, etc. The secondary oil-water separator is a fine filter, which is placed before entering the saturator to further remove oil.

[0062] The air saturator in this embodiment is a pressure vessel made of 316L stainless steel. The saturator is filled with deionized water and is equipped with a water level gauge, a water inlet valve, an exhaust valve, a drain valve, a sensor test hole, etc. Since the occurrence of salt fog requires a certain temperature and humidity, in order to ensure that the saturated air entering the test chamber has a certain humidity and temperature, the compressed air must be heated and humidified. After the compressed air enters the saturator, it passes through deionized water or distilled water and is filtered again. It is then mixed with the water vapor generated by the deionized water or distilled water in the cylinder to make the air entering the nozzle clean and moist air. The saturator is connected to a three-way joint, one end of which is connected to the pipeline leading to the nozzle, and the other end is connected to a pressure gauge. Therefore, the saturator is not only a device for heating and humidifying the compressed air, but also a device for re-purifying the compressed air. The saturator temperature is achieved by electric heating, and the temperature is adjusted according to the field test temperature.

[0063] The air compressor in this embodiment can be a screw air compressor. The main parameters are: intake pressure 1Bar (a), exhaust pressure 0.75MPa (e), exhaust volume 2.68m 3 / min, gear transmission mode, 380V voltage drive, unit weight is about 400kg, unit dimensions are 1225×650×1400mm.

[0064] The gas storage tank in this embodiment can be equipped with two 1m 3 Gas storage tank. The basic parameters are: working pressure 0.8Mpa, material Q235B, inlet and outlet diameter DN40, size 800mm diameter, height 2200mm, weight about 300kg, equipped with safety valve, pressure gauge, drain valve and other accessories.

[0065] It should be noted that the above-mentioned air compressor, air storage tank, primary oil-water separator, pressure reducing valve, solenoid valve, secondary oil-water separator, pressure regulating valve, air saturator and spray solenoid valve are all existing technologies that can be purchased on the market. Even if the inventor does not explain them in detail, those skilled in the art are aware of their structures and functions.

[0066] The spray module also includes a spray water supply unit 11, which includes a secondary filter, a spray seawater tank and a spray water pump arranged in the control room body. The water pump transports the seawater in the clean seawater unit in the seawater reservoir to the secondary filter for secondary filtration and then sends it to the spray seawater tank.

[0067] The spray module also includes a spray execution unit 12, which is located in the test chamber body and fixed on the connecting frame. The execution unit includes two spray water inlet pipes 121 arranged left and right along the length direction of the test chamber body and two spray air inlet pipes 122 arranged left and right, and the spray water inlet pipe and the spray air inlet pipe are provided with spray towers 123, and the spray towers are evenly arranged in multiple directions along the length. The spray towers are respectively connected to the spray water inlet pipe and the spray air inlet pipe through hoses. The spray tower adopts a non-crystallization nozzle, and a baffle 124 with an adjustable oblique angle is provided at the nozzle position. In this embodiment, the distance between the two spray water inlet pipes / two spray air inlet pipes is 5700mm, and the height from the ground is 4.0~4.1m, and there are 26 sets of spray towers on each side.

[0068] The two spray air inlet pipes are connected to the air supply unit; one end of the two spray water inlet pipes is respectively connected to a balancing water tank 125, and a top water tank 126 is provided at the central upper part between the two balancing water tanks. The upper inlet of the top water tank is connected to the spray seawater tank through the main spray pipe and the spray water pump, and the lower two sides of the top water tank are respectively connected to the two balancing water tanks through the spray branch pipes. In this embodiment, the top water tank is a PP material water tank with a size of 850×850×400mm. A water level float is installed in the top water tank for automatic water replenishment. The balancing water tank is 300×500×500mm and is made of PP material. The seawater in the top water tank is sent into the two balancing water tanks by the float control.

[0069] In addition, in order to maintain a certain siphon height, the seawater siphon water level needs to be kept within the range of 200-500mm. The seawater pumped in from the clean seawater unit is stored in the spray seawater tank and pumped into the top water tank by the magnetic circulation pump (spray water pump). The automatic liquid level controller directs the magnetic circulation pump to work, keeping the upper and lower limits of the water level within 10mm, and maintaining continuous water supply to the sea mist generator.

[0070] The spray module further includes a spray control unit 13, which includes a salt spray cabinet arranged in the control chamber, and a sub-pressure regulating valve connected one-to-one with the main pressure regulating valve and the spray tower is arranged in the salt spray cabinet. The saturator temperature is transmitted to the control system through the temperature sensor, and the control system calculates the power through PID regulation to ensure the saturation barrel temperature.

[0071] In this embodiment, by controlling the air supply unit and the water supply unit, the spray outlet pressure is 0.07-0.14 MPa and the sedimentation rate is 1-2 mL / 80 cm 2 ·h.

[0072] Among them, the spray module uses the induced effect generated by the high-speed spraying of the nozzle to suck up the seawater and spray it into a scattered mist. Since the mist contains some un-atomized water droplets, the sprayed mist airflow cannot be directly introduced into the test chamber body, but hits an inclined baffle to break the un-atomized water droplets into mist or block them back, so that the sprayed mist is a fine mist that does not contain water droplets. The amount of sea mist precipitation is directly related to the aperture of the nozzle, the supply of seawater and the level of the air supply pressure of the air source, and the angle of the baffle. Therefore, the amount of precipitation and the uniformity of the distribution of fog particles can be adjusted in a variety of ways.

[0073] (5) Regarding the spray module in this embodiment

[0074] See also Figure 4-7 and Fig.11 The spray module includes a spray water supply unit and a spray execution unit; the spray water supply unit includes a spray water pump 14, and the spray water pump adopts frequency conversion control and is connected to the water outlet pipe of the water pump.

[0075] The spray execution unit 15 is arranged in the test chamber body and fixed on the connecting frame. The spray execution unit includes two spray pipes 151 arranged along the driving direction of the vehicle and arranged horizontally on the left and right. The spray main water inlet pipe 152 is connected to the spray water pump. The ends of the two spray pipes are connected to the spray main water inlet pipe. A pressure sensor is arranged on the spray main water inlet pipe. Control valves and pressure gauges are respectively arranged on the two spray pipes. The diameter of the spray main water inlet pipe is twice that of the spray pipe. The spacing between the two spray pipes is 2m, and the length is 13~14m. The height of the two spray pipes from the ground is consistent with that of the spray pipe. Each spray pipe is provided with 9 nozzles 153, and the interval between two adjacent nozzles is 1.5m. The nozzle adopts PPR pressure-resistant nozzle, and the nozzle can be rotated 90°. The spray shape is a solid cone, the nozzle outlet pressure is 500kPa, the spray flow rate is ≥2.5L / min, the nozzle nozzle diameter is φ3.5mm, and the spray droplet diameter is 0.5~4.5mm.

[0076] In this way, the spraying area can be ensured to be 4.5mx12m, and the effective spraying length can be ensured to be not less than 12m. As another implementation in this embodiment, the nozzle and the nozzle seat are connected by threads, and the nozzle seat and the spraying water pipe are connected by clamps.

[0077] (6) Regarding the splash module in this embodiment

[0078] See also Figure 4-7 and Fig.12 The splash module includes a splash pool unit 16 and a side splash unit 17; the splash pool unit is a splash pool set on the ground inside the test chamber, the length and width of the splash pool are consistent with the length and width of the internal dimensions of the test chamber, and the depth of the splash pool is 400mm; and slopes are set at both ends of the water inlet and outlet of the splash pool, and the retaining walls 3 set on both sides can block water when simulating seawater splashing. When a vehicle enters the splash pool, the splashing pool water can infiltrate and corrode the wheel hub and frame of the vehicle.

[0079] The side splash water unit includes six splash water pipes 171 arranged along the driving direction of the vehicle, three of which are arranged on the left and right sides and fixed on the connecting frame, the splash water pipes on the left and right sides are 5300~5700mm apart, and the three splash water pipes are 1m, 2.3m, and 3.6m above the ground respectively. One end of the three splash water pipes on the left is connected to the left water supply pipe 172, and one end of the three splash water pipes on the right is connected to the right water supply pipe 173, and the left water supply pipe and the right water supply pipe are both connected to the main splash water inlet pipe 174, and the main splash water inlet pipe is connected to the splash water pump in the control room body; a splash water nozzle 175 is arranged at an interval of 1m on each splash water pipe, and there are 78 splash water nozzles in total, the aperture of the splash water nozzle is 3.5mm, the spray shape is a solid cone, the spray pressure is ≥500kPa, the spray flow rate is ≥2.5L / min, and the splash water distance is ≥12m.

[0080] This embodiment uses program control to control water splashing, so that water splashing starts before the vehicle enters the device and stops after the vehicle leaves the device. Timed shutdown can be used, and the continuous water spraying time is adjustable from 10s to 3min.

[0081] (7) About the cleaning module in this embodiment

[0082] See also Figure 4-7 The cleaning module includes a tap water tank 18 disposed in the control room body and a cleaning pipe connected to the tap water tank, and the cleaning pipe is respectively connected to the top water tank of the spray module, the spray main water inlet pipe of the spray module, and the splash main water inlet pipe of the splash module; the cleaning module also includes a hand valve disposed at the end of the spray pipe, a hand valve at the end of the spray pipe, and a hand valve at the end of the splash pipe; the cleaning module also includes a high-pressure cleaning spray gun disposed in the test room body, and the high-pressure cleaning spray gun is connected to the cleaning pipe. In this embodiment, the tap water tank is a plastic bucket with a volume of about 2000L, and is connected to a tap water pipe, on which a hand valve is disposed.

[0083] Spray pipe cleaning: After the spray test is completed, open the hand valve at the end of the spray pipe, drain the seawater and then close the hand valve. Then turn on the spray pipe cleaning button, and the water pump will automatically pump the tap water in the water tank into the top water tank and the balance water tank to perform the water spray process. The cleaning time can be set to clean the spray pipe. After the spray is completed, open the hand valve to drain the water in the water pipe. Finally, use air to dry the moisture in the pipe.

[0084] Cleaning of the spray pipeline: After the spray test is completed, open the hand valve at the end of the spray pipeline to drain the seawater. Open the cleaning button of the spray pipeline, and the cleaning water pump and the air inlet valve will automatically open to clean the spray pipeline. The cleaning time can be set to clean the spray pipeline. The cleaning water pump will be completed first, and the air source will be delayed, which will automatically blow out the water in the pipeline. The cleaning of the splashing pipeline is the same as the spray pipeline, so I will not repeat it here.

[0085] Chamber interior cleaning: The high-pressure cleaning spray gun is connected to the tap water pipeline to clean the chamber interior and the vehicle body.

[0086] The cleaning module also includes a sewage recovery pool arranged behind the rotating pavement of the U-shaped circulation pavement. The sewage recovery pool is located underground, and the recovery pool is divided into a grease trap and a water reservoir. A section of the test passage between the test chamber body and the rotating pavement has a downward slope. The wastewater after the test and cleaning flows into the water reservoir, and then passes through the adsorption effect of the partition arranged between the grease trap and the water reservoir. The oil and impurities in the wastewater are adsorbed on the partition filter screen, and then the filtered water enters the grease trap. The grease trap adopts a horizontal flow construction, and the wastewater flows slowly in the horizontal direction. The size of the sewage recovery pool is 4600*1800mm.

[0087] (8) About the control system in this embodiment

[0088] See also Figure 13-15 , the control system in this embodiment includes a hardware module and a software module.

[0089] The hardware module includes an electronic control system that controls the water pump, solenoid valve, pressure sensor, temperature sensor, etc. in the spray module, the mist module, and the splash module. The electrical control system adopts the terminal + local + host control mode. The lower computer PLC + touch screen can be controlled independently, and the upper computer can be centrally monitored through the communication interface.

[0090] Terminal: It is composed of terminal controllers to control the pressure, flow, etc. of the equipment.

[0091] Local: It consists of the system main controller and touch screen, which controls the terminal controller through the communication bus and performs distributed control on other systems of the equipment.

[0092] Host: It is composed of a computer and a host monitoring system. The host accesses the local device through the RS485 interface to query, control and monitor the local device.

[0093] During on-site spray control, the PLC sends out the inverter operation instruction, and converts the pressure value corresponding to the set flow into a current signal to the inverter. After PID operation, the output frequency is adjusted to change the speed of the water pump, so that the spray water pressure gradually approaches the set target water pressure and remains stable. During on-site spray control, the spray function is realized by controlling the compressor, pressure regulating valve, spray solenoid valve, etc. The ambient atmosphere is compressed into high-pressure air by the air compressor and enters the air storage tank. Clean air is provided to the spray module through gas pipelines, pressure reducing valves, solenoid valves, oil-water separators, pressure regulating valves, air saturators, spray solenoid valves, nozzles and other components. The control of the splash module is similar to that of the spray module.

[0094] The electrical control objects mainly include saturated barrel temperature, spray switch, spray pressure, and spray flow. The saturated barrel temperature is achieved through electric heating, and the temperature is adjusted according to the on-site test temperature. The saturated barrel temperature is transmitted to the control system through the temperature sensor, and the control system calculates the power through PID regulation to ensure the saturated barrel temperature.

[0095] The spray switch controls the on and off of compressed air during spraying. When spraying, the solenoid valve opens, compressed air enters the nozzle, and the spray forms mist particles; when spraying stops, the solenoid valve closes, compressed air no longer enters the nozzle, and spraying stops.

[0096] Spray module pressure and flow measurement and control: The spray module has a pressure sensor installed on the main water supply line of the water pump. Its function is to measure the water pressure in the pipeline in real time, and output the current signal (4-20mA) that changes with the water pressure in the pipeline to the PLC. After being processed by the PLC, it is transmitted to the operating console for display and record, and is also transmitted to the frequency converter as a feedback signal. At the same time, an electromagnetic flowmeter is installed on the main pipeline to measure the water flow in the pipeline in real time, and output the current signal (4-20mA) that changes with the water flow in the pipeline to the PLC.

[0097] The spray module adjusts the operating frequency of the water pump through the frequency converter. The PLC sends out the frequency converter operation command, and converts the pressure value corresponding to the flow rate set by the host computer into a current signal to the frequency converter. At the same time, the current signal sent by the pressure sensor is transmitted to the frequency converter through another analog signal channel. The frequency converter adjusts the output frequency according to the difference between the two signals (PLC given value and pressure sensor feedback value) after PID calculation, thereby changing the speed of the water pump. The speed will increase or decrease the water pressure in the pipeline. The fixed given value is compared with the continuous feedback signal and continuous calculation to form a closed-loop control, so that the nozzle water pressure gradually approaches the set target water pressure and remains stable.

[0098] The software modules include a login module, an information management module, a test control module, a help module and a system debugging module. The test control module includes a parameter setting module, a test operation module, a system schematic module, a trend curve module, an alarm display module and a report output module.

[0099] 1) Login module: capable of completing the management of test system operators, password login, etc.;

[0100] 2) Information management module: capable of completing management functions such as input and query of test prototype information;

[0101] 3) System debugging module: capable of completing the status monitoring of each component and the individual operation control of the equipment during system debugging;

[0102] 4) Parameter setting module: capable of completing the setting of test requirements such as test intensity and time and related parameters of system equipment;

[0103] 5) Test operation module: capable of completing the operation and control of system equipment such as test start, end and replenishment;

[0104] 6) System schematic diagram module: It can display the process parameters such as saturated barrel temperature, test time, and the operating status of related equipment in the test system in real time, and realize the conversion of equipment control mode;

[0105] 7) Trend curve module: can display and record the change curve of main parameters during the test;

[0106] 8) Alarm display module: can display and query the fault information and solutions that occur during system operation, and locate the fault to a single device based on the information;

[0107] 9) Report output module: can output test results in the form of reports.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that various changes may be made to it in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A large-scale walk-in dynamic and static combined seawater corrosion test system for vehicles, characterized by: It includes a test chamber body, a dynamic test device and a static test device, wherein the dynamic test device includes a spray module and a splash module, and the static test device includes a sealing structure between the spray module and the test chamber body; The sealing structure of the test chamber body includes a chamber frame and a membrane cloth. Water retaining walls are arranged on both sides of the length direction of the test chamber body. Mounting studs are embedded in the water retaining walls. The chamber frame is welded by hot-dip galvanized square tubes. The column of the chamber frame and the mounting studs are screwed with nuts. The nuts are wrapped with protective covers and sealed with protective wax. The membrane cloth is made of PVC material and covers the outside of the chamber frame. Opening and closing doors are arranged at the front and back ends of the chamber body. The side and bottom edges of the door frame of the opening and closing door are provided with rubber strips and locking mechanisms are arranged at the top and bottom. The rest of the membrane cloth is sealed. Mounting holes are reserved inside the chamber frame. The mounting holes are connected to the mounting frame. The spray module, the spray module and the splashing module are fixed on the mounting frame. It also includes a water supply module and a control system. The water supply module includes a seawater reservoir, a vacuum tank and a water pump; the seawater reservoir is arranged at the front end, rear end or side of the test chamber body, the seawater reservoir is located underground and a filter is arranged in the middle thereof, the filter divides the seawater reservoir into a clean seawater unit and a sedimentation filtration unit, and the seawater is introduced into the sedimentation filtration unit and then filtered by the filter and enters the clean seawater unit; the filter has three layers of filter screens, with grades of 100 mesh, 150 mesh and 200 mesh, respectively, which can block impurities with a diameter greater than 0.1 mm; the vacuum tank and the water pump are located on the ground, and a filter is arranged on the top of the vacuum tank. A water adding ball valve and an exhaust valve, a water suction pipe is arranged on the upper part of the vacuum tank, the water suction pipe extends from the upper part of the vacuum tank to the bottom of the vacuum tank, and the water suction pipe outside the tank is provided with a flange, and is connected to a water pumping pipe through the flange, and the water pumping pipe extends into the clean seawater unit in the seawater reservoir; a drain valve is arranged at the bottom of the vacuum tank, and the lower part of the vacuum tank is connected to the water suction port of the water pump through a pipeline, and a water inlet valve is arranged on the pipeline; a water outlet pipeline is arranged at the other end of the water pump, and the water outlet pipeline is connected to the spray module, the spray module and the splashing module, and a water outlet check valve and a water outlet ball valve are arranged on the water outlet pipeline; The spray module includes an air supply unit arranged in the control chamber of the control system, and the air supply unit includes an air compressor, an air storage tank, a pressure reducing valve, a solenoid valve, an oil-water separator, a pressure regulating valve, an air saturator and a spray solenoid valve connected in sequence; the spray module also includes a spray water supply unit, and the spray water supply unit includes a secondary filter, a spray seawater tank and a spray water pump arranged in the control chamber, and the vacuum tank transports the seawater in the clean seawater unit in the seawater reservoir to the secondary filter for secondary filtration and then sends it to the spray seawater tank; the spray module also includes a spray execution unit, and the execution unit is located in the test chamber and fixed on the connecting frame, and the execution unit includes two spray water inlet pipes arranged on the left and right along the length direction of the test chamber and two spray air inlet pipes arranged on the left and right, and the spray A spray tower is arranged on the mist water inlet pipe and the spray air inlet pipe, and a plurality of the spray towers are evenly arranged along the length direction. The spray towers are respectively connected to the spray water inlet pipe and the spray air inlet pipe through a hose. The spray tower adopts a non-crystallization nozzle, and a baffle with an adjustable oblique angle is arranged at the nozzle position; the two spray air inlet pipes are connected to the air supply unit; the ends of the two spray water inlet pipes in the same direction are respectively connected to a balancing water tank, and a top water tank is arranged on the upper part between the two balancing water tanks. The inlet of the top water tank is connected to the spray seawater tank through the spray water pump, and the two sides of the top water tank are respectively connected to the two balancing water tanks through pipelines; the spray module also includes a spray control unit, and the spray control unit includes a salt spray cabinet arranged in the control chamber body, and a sub-pressure regulating valve connected one-to-one with the main pressure regulating valve and the spray tower is arranged in the salt spray cabinet; The spray module includes a spray water supply unit and a spray execution unit; the spray water supply unit includes a spray water pump, the spray water pump adopts frequency conversion control and is connected to the water supply pipeline of the vacuum tank; the spray execution unit is arranged in the test chamber body and fixed on the connecting frame, the spray execution unit includes a spray main water inlet pipeline and spray pipelines arranged horizontally on the left and right, the spray main water inlet pipeline is connected to the spray water pump, one end of the two spray pipelines in the same direction is connected to the spray main water inlet pipeline, the spray main water inlet pipeline is provided with a pressure sensor, and two spray pipes A control valve and a pressure gauge are respectively provided on the spray pipe. The diameter of the main water inlet pipe of the spray is twice that of the spray pipe. The distance between the two spray pipes is 2m, and the length is 13~14m. Each spray pipe is provided with 9 nozzles, and the interval between two adjacent nozzles is 1.5m. The nozzle adopts a PPR pressure-resistant nozzle, which can be rotated 90°. The spray shape is a solid cone, the nozzle outlet pressure is 500kPa, the spray flow rate is ≥2.5L / min, the nozzle nozzle diameter is φ3.5mm, and the spray droplet diameter is 0.5~4.5mm; The splash module includes a splash pool unit and a side splash unit; the splash pool unit is a splash pool arranged on the ground inside the test chamber body, the length and width of the splash pool are consistent with the length and width of the internal dimensions of the test chamber body, and the depth of the splash pool is 400mm; and slopes are arranged at both ends of the water inlet and outlet of the splash pool; the side splash unit includes six splash pipes, three of which are arranged on the left and right sides respectively and the three on the same side are arranged vertically in parallel, the splash pipes are fixed on the connecting frame, the splash pipes on the left and right sides are 5300~5700mm apart, and the three splash pipes are 100mm high from the ground The lengths are 1m, 2.3m, and 3.6m respectively. The same end of the three splashing pipes on the left is connected to the left water supply pipe, and the same end of the three splashing pipes on the right is connected to the right water supply pipe, and the left water supply pipe and the right water supply pipe are both connected to the splashing main water inlet pipe, and the splashing main water inlet pipe is connected to the splashing water pump in the control room body; each splashing pipe is provided with a splashing nozzle at intervals of 1m, and there are 78 splashing nozzles in total, the aperture of the splashing nozzle is 3.5mm, the spray shape is a solid cone, the spray pressure is ≥500kPa, the spray flow rate is ≥2.5L / min, and the splashing distance is ≥12m; It also includes a test road surface auxiliary module, which includes a U-shaped circulating road surface, one side of the U-shaped circulating road surface is a test channel, the test laboratory body is arranged in the middle of the test channel, the road surface entry section connected to the driving-in end of the test channel, the road surface connected to the driving-out end of the test channel is a turning road surface, and a section of the road surface connecting the turning road surface and the driving-in section is a return channel; the driving-in road of the U-shaped circulating road surface is extended at the front end of the driving-in section, and the driving-out road of the U-shaped circulating road surface is extended at one end of the return channel facing the turning road surface; a sewage recovery pool is arranged behind the turning road surface of the U-shaped circulating road surface, the sewage recovery pool is located underground, and the sewage recovery pool is divided into an oil separator and a water storage tank, and a section of the test channel from the test laboratory body to the turning road surface has a downward slope.

2. The large-scale walk-in combined dynamic and static seawater corrosion test system for vehicles as claimed in claim 1, characterized in that: The distance between the two spray water inlet pipes or the two spray air inlet pipes is 5700mm, the height from the ground is 4.0~4.1m, 26 sets of spray towers are arranged on each side, the spray outlet pressure is 0.07~0.14MPa, and the sedimentation rate of the spray module is 1~2mL / 80cm 2 ·h.

3. The large-scale walk-in combined dynamic and static seawater corrosion test system for vehicles as claimed in claim 2, characterized in that: It also includes a cleaning module, which includes a tap water tank arranged in the control room body, the tap water tank is connected to a cleaning pipe, and the cleaning pipe is respectively connected to the top water tank of the spray module, the spray main water inlet pipe of the spray module, and the splash water main water inlet pipe of the splash water module; the cleaning module also includes a hand valve arranged at the end of the spray water inlet pipe, a hand valve at the end of the spray pipe, and a hand valve at the end of the splash water pipe; The cleaning module also includes a high-pressure cleaning spray gun disposed in the test chamber body, and the high-pressure cleaning spray gun is connected to the cleaning pipeline.

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