Spraying system capable of simulating rainfall condition and used for rain erosion test

Abstract

The invention relates to the technical field of laboratory environment simulation test devices, and provides a rain erosion test spraying system capable of simulating rainfall conditions, the rain erosion test spraying system comprises a nozzle needle head assembly, the nozzle needle head assembly comprises a plurality of nozzle needle head units, and each nozzle needle head unit comprises a plurality of needle head bodies; the water guide system can convey a water source to the needle bodies, the needle bodies communicate with the water tank through the water guide system, and the water guide system can control the water outlet amount of the needle bodies, so that the rainfall is controlled; the air control system can convey compressed air to the needle bodies, the needle bodies communicate with the air tank through the air control system, and the air control system can control the blowing-off force of the ends of the needle bodies, so that the diameter of raindrops is controlled; and a bracket. The rain erosion test spraying system capable of simulating the rainfall condition can control the rainfall capacity and the diameter of raindrops, can simulate a more real rainfall environment, and improves the accuracy of a test result.

Description

Technical Field

[0001] The invention relates to the technical field of laboratory environment simulation test devices, and in particular to a spray system for rain erosion testing that can simulate rainfall conditions. Background Art

[0002] At present, there is no standard evaluation method and assessment standard for the protective life or durability of the leading edge protective materials of wind turbine blades. It is generally recognized in the industry that the protective life is evaluated by using experimental equipment to simulate the scouring damage of high-speed rainwater.

[0003] At present, some universities and enterprises at home and abroad have conducted some research on the wind turbine blade coating rain erosion resistance test device. For example, in the prior art, the patent application number CN201911079992.0 discloses a wind turbine blade rain erosion test system, the patent application number CN202010726988.5 discloses a rain erosion test device and system, the patent application number CN202120198148.6 discloses a simulated rain erosion spray device, and the patent application number CN202120013924.0 discloses a wind turbine blade rain erosion test chamber. Although this type of spray system adjusts the rainfall by controlling the water supply flow rate, and the raindrops at the rainfall end fall by free fall, the spray system can only control the rainfall alone, and cannot simultaneously control test parameters such as raindrop diameter, and cannot achieve refined control of the simulated rainfall environment, thus affecting the accuracy of the test results.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to propose a spray system for rain erosion testing that can simulate rainfall conditions, so as to solve the problem that the spray system of the wind turbine blade coating rain erosion resistance test device in the prior art can only control the rainfall amount alone, but cannot simultaneously control test parameters such as raindrop diameter, and cannot achieve fine control of the simulated rainfall environment, thereby affecting the accuracy of the test results.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A spray system for rain erosion testing capable of simulating rainfall conditions, the spray system for rain erosion testing capable of simulating rainfall conditions comprising:

[0008] A nozzle needle assembly, wherein the nozzle needle assembly comprises a plurality of groups of nozzle needle units, and each group of nozzle needle units comprises a plurality of needle bodies;

[0009] A water guide system, which can transport water to each needle body. The needle body is connected to the water tank through the water guide system. The water guide system can control the water output of the needle body, thereby controlling the rainfall;

[0010] An air control system, wherein the air control system can deliver compressed air to each needle body, wherein the needle body is connected to an air tank through the air control system, and the air control system can control the blowing force of the end of the needle body, thereby controlling the size of the raindrop diameter;

[0011] The bracket is vertically arranged on the working plane, and the water guide system, the air control system, and the nozzle needle assembly are all installed on the bracket.

[0012] The spray system for rain erosion testing capable of simulating rainfall conditions described in the present invention can not only control the rainfall amount but also control the diameter of raindrops, thereby simulating a more realistic rainfall environment and improving the accuracy of test results.

[0013] Furthermore, the needle body is a double-layer needle, and the needle body includes an outer needle and an inner needle that are coaxially arranged, the outer needle is connected to the gas tank, and the inner needle is connected to the water tank.

[0014] Furthermore, the water guide system includes a water pipe, a peristaltic pump, a water outlet distributor and a solenoid valve. The water inlet end of the water pipe is connected to a water tank, and the water outlet end of the water pipe is connected to the inner needle. A plurality of groups of water pipe branches are arranged on the water pipe, and the water pipe branches correspond one-to-one to the nozzle needle units. A peristaltic pump, a water outlet distributor and a solenoid valve are arranged on each group of water pipe branches.

[0015] Furthermore, the air control system includes an air pipe pipeline, a pulse valve, a pressure reducing valve, and an air outlet distributor. The air inlet end of the air pipe pipeline is connected to the air tank, and the air outlet end of the air pipe pipeline is connected to the outer needle. A plurality of groups of air pipe branches are arranged on the air pipe pipeline. The air pipe branches correspond one-to-one to the nozzle needle units, and a pulse valve, a pressure reducing valve and an air outlet distributor are arranged on each group of air pipe branches.

[0016] Furthermore, the bracket includes a main frame, a tripod and a top bracket, the nozzle needle assembly is installed on the main frame, and the water guide system and the air control system are installed on the top bracket.

[0017] Furthermore, the spray system for rain erosion testing that can simulate rainfall conditions also includes a lifting device, which can adjust the height between the needle body and the sample to adjust the falling speed of raindrops.

[0018] Furthermore, the lifting device is installed on the tripod.

[0019] Furthermore, the bracket is formed by welding corrosion-resistant materials.

[0020] Furthermore, the water tank is provided with a temperature control system, which can control the water temperature to reach the required temperature for the test.

[0021] Furthermore, the water temperature of the water tank can be adjusted within a range of 0 to 40°C.

[0022] Compared with the prior art, the spray system for rain erosion testing that can simulate rainfall conditions described in the present invention has the following beneficial effects:

[0023] The spray system for rain erosion testing that can simulate rainfall conditions described in the present invention, the bracket, nozzle needle assembly, water guide system, air control system and lifting device are interconnected and play multiple roles. Not only can the rainfall amount be controlled, but also the blowing force at the end of the needle can be controlled by adjusting the air pressure to control the diameter of the raindrops. In addition, the raindrop falling height is adjusted by the lifting device to control the raindrop speed. In summary, the spray system for rain erosion testing that can simulate rainfall conditions described in the present invention can easily achieve precise control of rain erosion parameters such as rain intensity, raindrop diameter, and raindrop speed at the same time, simulate a real rainfall environment, and has obvious guiding significance for formula screening in the research and development process of wind turbine blade coating products. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the main structure of a spray system for rain erosion testing that can simulate rainfall conditions according to an embodiment of the present invention;

[0025] Figure 2 It is a left-side structural schematic diagram of a spray system for rain erosion testing capable of simulating rainfall conditions according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of a top view of a spray system for rain erosion testing that can simulate rainfall conditions according to an embodiment of the present invention;

[0027] Figure 4 It is a schematic cross-sectional structure diagram of a needle body of a spray system for rain erosion testing that can simulate rainfall conditions according to an embodiment of the present invention;

[0028] Figure 5 The state diagram of three samples before the test is shown in Example 3 of the present invention, which is a spray system for rain erosion test that can simulate rainfall conditions;

[0029] Figure 6 The state diagram of the test of three samples for 1 hour using a spray system for rain erosion testing that can simulate rainfall conditions as described in Example 3 of the present invention;

[0030] Figure 7The state diagram of the three test panels after a 2-hour test using a rain erosion test spray system that can simulate rainfall conditions as described in Example 3 of the present invention;

[0031] Figure 8 The state diagram of the three test samples after 3 hours of testing using a spray system for rain erosion testing that can simulate rainfall conditions as described in Example 3 of the present invention;

[0032] Fig. 9 The state diagram of three samples before the test is shown in Example 4 of the present invention, which are tested by a spray system for rain erosion testing that can simulate rainfall conditions;

[0033] Fig.10 The state diagram of the three test panels tested using a rain erosion test spray system capable of simulating rainfall conditions as described in Example 4 of the present invention for 1 hour;

[0034] Fig.11 The state diagram of the three test panels after 2 hours of testing using a spray system for rain erosion testing that can simulate rainfall conditions as described in Example 4 of the present invention;

[0035] Fig.12 This is a status diagram of a 3-hour test of three samples tested using a rain erosion test spray system that can simulate rainfall conditions as described in Example 4 of the present invention.

[0036] Description of reference numerals:

[0037] 1. Needle body; 11. Nozzle needle unit; 111. Nozzle needle assembly; 101. Outer needle; 102. Inner needle; 103. Needle seat; 104. Blow tube sleeve; 2. Water tank; 200. Water guide system; 201. Water pipe; 202. Peristaltic pump; 203. Water outlet distributor; 204. Solenoid valve; 3. Gas tank; 300. Gas control system; 301. Air pipe; 302. Pulse valve; 303. Pressure reducing valve; 304. Air outlet distributor; 500. Bracket; 501. Main frame; 502. Tripod; 503. Top frame; 6. Electrical box; 7. Filter system. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The descriptions of "first", "second", etc. mentioned in the embodiments of the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0040] Example 1

[0041] In the prior art, the spray system of the wind turbine blade coating rain erosion resistance test device can only control the rainfall amount, but cannot simultaneously control test parameters such as raindrop diameter control and raindrop velocity, and cannot achieve fine control of the simulated rainfall environment, thus affecting the accuracy of the test results.

[0042] To meet the current demand for rapid evaluation of wind farm material performance and solve the problems in existing technologies, such as Figures 1 to 4 As shown, the applicant proposes a spray system for rain erosion testing that can simulate rainfall conditions in this embodiment, and the spray system for rain erosion testing that can simulate rainfall conditions includes:

[0043] A nozzle needle assembly 111, wherein the nozzle needle assembly 111 comprises a plurality of nozzle needle units 11; each nozzle needle unit 11 comprises a plurality of needle bodies 1, and the needle bodies 1 are capable of generating raindrops;

[0044] A water guide system 200, which can transport water to each needle body 1 to ensure that water can smoothly reach the area that needs to be sprayed. The needle body 1 is connected to the water tank 2 through the water guide system 200. The water guide system 200 can control the water output of the needle body 1, thereby controlling the rainfall;

[0045] An air control system 300, wherein the air control system 300 can deliver compressed air to each needle body 1, wherein the needle body 1 is connected to the air tank 3 through the air control system 300, and the air control system 300 controls the blowing force of the end of the needle body 1, thereby controlling the diameter of the raindrops;

[0046] The bracket 500 is vertically arranged on a working plane, and the water guiding system 200 , the air control system 300 , and the nozzle needle assembly 111 are all installed on the bracket 500 .

[0047] The present embodiment proposes a spray system for rain erosion testing that can simulate rainfall conditions. It can simultaneously realize precise control of rain erosion parameters such as rain intensity, raindrop diameter, and raindrop velocity. It is used to test the rain erosion resistance of materials and has been applied to the rain erosion resistance test of wind turbine blade coatings. It simulates the rainfall environment conditions of different wind farms and studies the influence of different raindrop parameters on the rain erosion resistance of wind turbine blade materials under high-speed motion conditions. It can effectively evaluate the rain erosion resistance of wind turbine blades, help improve the process of wind turbine blades, reduce losses caused by rain erosion of wind turbine blades, and improve the safety of wind turbine operation.

[0048] Specifically, Figure 4 As shown, the needle body 1 is a double-layer needle, and the needle body 1 includes an outer needle 101 and an inner needle 102 which are coaxially arranged. The outer needle 101 is connected to the gas tank 3, and the inner needle 102 is connected to the water tank 2; the diameter of the outer needle 101 is larger than the diameter of the inner needle 102.

[0049] More specifically, the needle body 1 is installed on the needle seat 103 , and the blow tube cover 104 is installed on the outer side of the needle seat 103 .

[0050] More specifically, the outer needle 101 is connected to the gas tank 3 through the gas control system 300 , and the inner needle 102 is connected to the water tank 2 through the water guide system 200 .

[0051] Specifically, the water guide system 200 includes a water pipe 201, a peristaltic pump 202, a water outlet distributor 203 and a solenoid valve 204. The water inlet end of the water pipe 201 is connected to the water tank 2, and the water outlet end of the water pipe 201 is connected to the inner needle 102. A plurality of water pipe branches are arranged on the water pipe 201. The water pipe branches correspond one-to-one to the nozzle needle unit 11. A peristaltic pump 202, a water outlet distributor 203 and a solenoid valve 204 are arranged on each group of water pipe branches.

[0052] Specifically, the water output of the needle body 1 is controlled by adjusting the rotation speed of the peristaltic pump 202, thereby controlling the rainfall amount.

[0053] Specifically, the greater the rotation speed of the peristaltic pump 202, the greater the water output of the needle body 1, and the greater the rainfall; the smaller the rotation speed of the peristaltic pump 202, the smaller the water output of the needle body 1, and the smaller the rainfall.

[0054] More specifically, the rotation speed range of the peristaltic pump 202 is 0 to 800 r / min, and the rainfall adjustment range is 0 to 100 mm / h.

[0055] In this embodiment, the rotation speed range of the peristaltic pump 202 is 500 r / min, and the rainfall is 60 mm / h.

[0056] Specifically, the air control system 300 includes an air pipe 301, a pulse valve 302, a pressure reducing valve 303, and an air outlet distributor 304. The air inlet end of the air pipe 301 is connected to the gas tank 3, and the air outlet end of the air pipe 301 is connected to the outer needle 101. A plurality of groups of air pipe branches are arranged on the air pipe 301. The air pipe branches correspond one-to-one to the nozzle needle unit 11. A pulse valve 302, a pressure reducing valve 303 and an air outlet distributor 304 are arranged on each group of air pipe branches.

[0057] Specifically, the function of the pressure reducing valve 303 is to reduce the inlet pressure of each group of air pipe branches to the required outlet pressure of the air pipe branches through adjustment, and rely on the energy of the medium itself to automatically maintain a stable valve for the outlet pressure of the air pipe branches to adapt to the entire system.

[0058] The generation of raindrops relies on low-pressure pulse gas to blow off the water droplets generated on the needle body 1. The setting of the pulse valve 302 can accurately control the diameter of the needle raindrops. The water output of the needle body 1 cooperates with the pulse gas to generate droplets of the required diameter.

[0059] Specifically, the air control system 300 controls the blowing force of the end of the needle body 1 by adjusting the air pressure.

[0060] Specifically, the air pressure can be adjusted by the pulse frequency of the pulse valve 302, thereby controlling the blowing force at the end of the needle body 1, and further controlling the diameter of the raindrops.

[0061] Specifically, the greater the pulse frequency of the pulse valve 302, the greater the air pressure, the greater the blowing force at the end of the needle body 1, and the smaller the raindrop diameter; the smaller the pulse frequency of the pulse valve 302, the smaller the air pressure, the smaller the blowing force at the end of the needle body 1, and the larger the raindrop diameter.

[0062] More specifically, the pulse frequency range of the pulse valve 302 is 3 to 20 Hz, and the raindrop diameter adjustment range is 1.5 to 6.0 mm.

[0063] In this embodiment, the frequency of the pulse valve 302 is 5.8 Hz, and the raindrop diameter is 5 mm.

[0064] More specifically, the multiple groups of nozzle needle units 11 are arranged in a matrix distribution. The diameters of the multiple needle bodies 1 in each group of nozzle needle units 11 are equal, and the diameters of the needle bodies 1 of each group of nozzle needle units 11 in the multiple groups of nozzle needle units 11 are not equal. In this way, when raining, it is only necessary to control the rainfall of different groups of needles through the solenoid valve 204 and the peristaltic pump 202, and adjust the air pressure by adjusting the pulse frequency of the pulse valve 302, thereby controlling the blowing force of the end of the needle body 1, and then controlling the size of the raindrop diameter.

[0065] Specifically, the bracket 500 includes a main frame 501 , a foot frame 502 and a top frame 503 , the nozzle needle assembly 111 is installed on the main frame 501 , and the water guide system 200 and the air control system 300 are installed on the top frame 503 .

[0066] Specifically, the shape of the main frame 501 is not specifically limited.

[0067] Specifically, the main frame 501 may be in a square shape, or in a circular shape, but is not limited thereto.

[0068] Specifically, the spray system for rain erosion testing that can simulate rainfall conditions also includes a lifting device, which can adjust the height between the needle body 1 and the sample to adjust the falling speed of raindrops.

[0069] Specifically, the height between the needle body 1 and the sample is h, and h is not specifically limited.

[0070] More specifically, the value range of h is: [200, 400], the unit of h is mm, and h can take any value between 200 and 400 mm.

[0071] Preferably, in this embodiment, the value of h is 200 mm.

[0072] Specifically, the lifting device is installed on the tripod 502. The lifting device controls the extension and retraction of the tripod 502, driving the entire main frame 501 and the top frame 503 to move up and down, thereby adjusting the height between the raindrops and the sample, and then adjusting the falling speed of the raindrops to simulate a rainfall environment with different rain speeds.

[0073] Specifically, the bracket 500 is welded from corrosion-resistant materials and is resistant to seawater corrosion.

[0074] Specifically, the water tank 2 is equipped with a temperature control system, which can control the water temperature to reach the required test temperature.

[0075] Specifically, the installation positions of the water tank 2 and the gas tank 3 are not specifically limited.

[0076] Specifically, the water tank 2 and the gas tank 3 can be installed on the main frame 501, and the water tank 2 and the gas tank 3 can also be installed on a working plane, but are not limited thereto.

[0077] Specifically, in this embodiment, the water tank 2 and the gas tank 3 can also be installed on the working plane. This arrangement facilitates the rain erosion test spray system that can simulate rainfall conditions to perform lifting motion driven by the lifting device.

[0078] Specifically, the water temperature of the water tank 2 is adjusted in the range of 0 to 40°C.

[0079] The spray system for rain erosion testing that can simulate rainfall conditions also includes a filtering system 7 , and the water tank 2 is connected to the filtering system 7 .

[0080] The spray system for rain erosion testing that can simulate rainfall conditions also includes an electrical box 6 .

[0081] Compared with other existing technologies, the present invention pays more attention to simulating the rainfall environment conditions in the real environment, can simultaneously adjust the rainfall intensity, raindrop diameter and rain speed, and can well simulate different rain erosion environments of materials, thereby achieving the purpose of simulating the rain erosion process of materials and coatings and accelerating performance evaluation.

[0082] The purpose of the present invention is to provide a spray system for rain erosion testing that can simulate rainfall conditions. This spray system simulates the real natural rainfall effect through the pneumatic pressure control principle of the nozzle. It can simulate a variety of rainfall environments. By adjusting the rotation speed of the peristaltic pump 202 to control the water output of the needle body 1, the rainfall can be controlled to achieve the simulation of three rainfall environments: moderate rain, heavy rain and rainstorm; the air pressure can be adjusted by the pulse frequency of the pulse valve 302 to control the blowing force at the end of the needle body 1, thereby controlling the size of the raindrop diameter; the raindrop falling height is adjusted by the lifting device to control the raindrop speed; it can achieve the simulation of rainfall environments with different rainfall, rain speed and raindrop diameter. The rain erosion test using this spray system can provide a basis for the selection of materials and coatings, and it is of great significance in the study of the damage mechanism and influencing factors of materials eroded by liquids.

[0083] Example 2

[0084] In this embodiment, different from the embodiment 1, the rotation speed range of the peristaltic pump 202 is 185r / min, the rainfall is 8mm / h; the frequency of the pulse valve 302 is 17.2HZ, the raindrop diameter is 2mm; the value of h is 200mm.

[0085] Example 3

[0086] In this embodiment, different from Embodiment 1, the rotation speed range of the peristaltic pump 202 is 320r / min, the rainfall is 30mm / h, the frequency of the pulse valve 302 is 15.3HZ, the average diameter of the raindrops is 2.5mm, and the value of h is 350mm.

[0087] Example 4

[0088] In this embodiment, different from the embodiment 3, the rotation speed range of the peristaltic pump 202 is 380r / min, the rainfall is 40mm / h; the frequency of the pulse valve 302 is 11.5HZ, and the average diameter of the raindrops is 3.5mm.

[0089] test

[0090] During the development of wind turbine blade coating products, a spray system for rain erosion testing that can simulate rainfall conditions as described in Examples 3 and 4 of the present invention is used to test the wind turbine blade coating rain erosion performance on wind turbine blade samples. The specific test method is as follows:

[0091] (1) U-shaped sample substrate and treatment: glass fiber composite material, polished with P120 sandpaper and then rinsed with water to remove dust on the surface, and cleaned with a dust-free cloth after the surface is dry;

[0092] (2) Coating system: epoxy primer 200μm + polyurethane topcoat 150μm;

[0093] (3) Measurement of paint film thickness of the sample before the test begins;

[0094] (4) Fix the sample to be tested on the sample loading mechanism, and place the sample to be tested below the needle body 1;

[0095] (5) Set the wind turbine blade sample speed to 1280 rpm;

[0096] Tip speed: 160.30m / s;

[0097] Ambient temperature: (23±2℃);

[0098] Test time: 3h

[0099] (6) After each 1-hour rain erosion test, observe the defect status of the sample, and carry out the test for a total of 3 hours.

[0100] (7) Performance observation and result evaluation after the test.

[0101] During the test, the wind turbine blade sample rotates continuously. The rain erosion performance test of the wind turbine blade coating is tested on Samples 1, 2 and 3 using a rain erosion test spray system that can simulate rainfall conditions as described in Example 3 of the present invention. The status of the sample before and after the test is as follows: Figures 5 to 8 The test results are shown in Table 1.

[0102] The rain erosion performance test of wind turbine blade coating was tested on samples 4, 5 and 6 using a spray system for rain erosion testing that can simulate rainfall conditions as described in Example 4 of the present invention. Figures 9 to 12 The test results are shown in Table 1.

[0103] Among them, the base materials and matching coatings of Sample 1, Sample 2, Sample 3, Sample 4, Sample 5 and Sample 6 are the same, and only the quality before the test is slightly different.

[0104] Table 1 Test results statistics

[0105]

[0106]

[0107] pass Figures 5 to 12 As can be seen from Table 1, when rain erosion tests are carried out using different rainfall parameters, the same matching coating has different degrees of damage and different mass losses. As the raindrop diameter and rainfall amount increase, the more serious the coating damage is, the greater the mass loss is. Therefore, the spray system for rain erosion testing that can simulate rainfall conditions of the present invention is practical and effective. The rainfall condition parameters can be set according to different regional conditions to examine the rain erosion resistance of different wind field materials.

[0108] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A spray system for rain erosion testing that can simulate rainfall conditions, characterized in that: The spray system for rain erosion testing that can simulate rainfall conditions includes: A nozzle needle assembly (111), wherein the nozzle needle assembly (111) comprises a plurality of groups of nozzle needle units (11), and each group of nozzle needle units (11) comprises a plurality of needle bodies (1); A water guide system (200), wherein the water guide system (200) is capable of conveying water to each needle body (1), wherein the needle body (1) is connected to a water tank (2) via the water guide system (200), and wherein the water guide system (200) is capable of controlling the water output of the needle body (1), thereby controlling the rainfall amount; an air control system (300), wherein the air control system (300) is capable of delivering compressed air to each needle body (1), wherein the needle body (1) is connected to the air tank (3) via the air control system (300), and wherein the air control system (300) is capable of controlling the blowing force at the end of the needle body (1), thereby controlling the size of the raindrop diameter; A support (500), wherein the support (500) is vertically arranged on a working plane, and the water guide system (200), the air control system (300), and the nozzle needle assembly (111) are all installed on the support (500).

2. A spray system for rain erosion testing capable of simulating rainfall conditions according to claim 1, characterized in that: The needle body (1) is a double-layer needle, comprising an outer needle (101) and an inner needle (102) which are coaxially arranged, the outer needle (101) being connected to the gas tank (3), and the inner needle (102) being connected to the water tank (2).

3. A spray system for rain erosion testing capable of simulating rainfall conditions according to claim 2, characterized in that: The water guiding system (200) comprises a water pipe line (201), a peristaltic pump (202), a water outlet distributor (203) and a solenoid valve (204); the water inlet end of the water pipe line (201) is connected to the water tank (2); the water outlet end of the water pipe line (201) is connected to the inner layer needle head (102); a plurality of groups of water pipe branches are arranged on the water pipe line (201); the water pipe branches correspond to the nozzle needle head units (11) one by one; and a peristaltic pump (202), a water outlet distributor (203) and a solenoid valve (204) are arranged on each group of water pipe branches.

4. A spray system for rain erosion testing capable of simulating rainfall conditions according to claim 2, characterized in that: The air control system (300) comprises an air pipe (301), a pulse valve (302), a pressure reducing valve (303), and an air outlet distributor (304); the air inlet end of the air pipe (301) is connected to the air tank (3); the air outlet end of the air pipe (301) is connected to the outer needle (101); a plurality of groups of air pipe branches are arranged on the air pipe (301); the air pipe branches correspond to the nozzle needle units (11) one by one; and a pulse valve (302), a pressure reducing valve (303), and an air outlet distributor (304) are arranged on each group of air pipe branches.

5. A spray system for rain erosion testing capable of simulating rainfall conditions according to claim 4, characterized in that: The support (500) comprises a main frame (501), a foot frame (502) and a top frame (503); the nozzle needle assembly (111) is mounted on the main frame (501); and the water guide system (200) and the air control system (300) are mounted on the top frame (503).

6. A spray system for rain erosion testing capable of simulating rainfall conditions according to claim 5, characterized in that: The spray system for rain erosion testing that can simulate rainfall conditions also includes a lifting device, which can adjust the height between the needle body (1) and the sample to adjust the falling speed of raindrops.

7. A spray system for rain erosion testing capable of simulating rainfall conditions according to claim 6, characterized in that: The lifting device is installed on the tripod (502).

8. The spray system for rain erosion testing capable of simulating rainfall conditions according to claim 1, characterized in that: The support (500) is made of corrosion-resistant materials welded together.

9. The spray system for rain erosion testing capable of simulating rainfall conditions according to claim 1, characterized in that: The water tank (2) is provided with a temperature control system, which can control the water temperature to reach the required temperature for the test.

10. A spray system for rain erosion testing capable of simulating rainfall conditions according to claim 9, characterized in that: The water temperature of the water tank (2) is adjustable in the range of 0 to 40°C.

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