Method and device for testing spraying performance of nozzle

Abstract

The invention relates to a nozzle spraying performance test method and device, and the method comprises the steps: carrying out the spraying of a liquid collection pipe through a nozzle, obtaining the flow of the nozzle according to the time from the spraying start to the spraying end of the nozzle, and the mass of liquid in a straight pipe, and carrying out the fitting of a liquid flow distribution equation of the nozzle; according to the pressure distribution testing method, spraying is conducted on the caps on the straight pipes through the nozzles, the pressure corresponding to the straight pipes is collected, and pressure distribution of the nozzles is obtained. The method provided by the invention can be used for measuring the injection non-uniformity and pressure distribution of different types of single nozzles or a plurality of nozzles under mutual interference under the states of different pressures, flows, angles, heights and the like, and the measurement precision is high; the device provided by the invention can complete full-automatic and high-precision measurement.

Description

Technical Field

[0001] The invention belongs to the technical field of nozzle performance testing, and in particular relates to a nozzle spray performance testing method and device. Background Art

[0002] In the online quenching system of aluminum alloy profiles, the design of the nozzle is crucial. They cool the high-temperature profiles by spraying liquids in different shapes (such as fan-shaped, conical, circular, linear, etc.). The spray characteristics of these nozzles, including pressure, angle and distance, determine the unevenness and pressure distribution on the action surface, which in turn affects the cooling rate, quenching deformation degree and mechanical properties of the profile. Therefore, accurate testing of these characteristics of the nozzle is crucial to ensure the rationality of the quenching process and product quality. However, the existing technology can only test the flow distribution when measuring the spray unevenness of the nozzle, but cannot test the pressure distribution, which has certain limitations and errors.

[0003] Refer to the patent with publication number CN201837408U, which discloses a digital full-function water nozzle test system, which can measure the relationship between the flow rate, injection angle and flow distribution of a single nozzle, as well as the relationship between the injection flow rate and flow distribution under the condition of mutual interference between multiple nozzles. However, its injection flow metering device is a transparent glass container, which needs to be measured manually and may have measurement deviations; it cannot test the liquid injection pressure at the test position.

[0004] Referring to the patent with publication number CN202420888U, a device for measuring the spatial distribution of the mist volume of variable spray is disclosed. The mist volume at different positions on the spray surface is measured by moving a cover plate with a gap on the mist collecting trough. Moreover, a two-dimensional space and three-dimensional space-time mist volume distribution diagram of the variable spray can be established for intuitive display, thereby providing a method and basis for evaluating the effect of pesticide spraying. However, the distance of the moving cover plate is not suitable for quantitative measurement. If the moving distance is not appropriate, the accuracy of the three-dimensional space distribution result of the variable spray will be affected. It is cumbersome to move the cover plate multiple times for testing. The mist volume needs to be measured manually, and there may be measurement errors. The liquid injection pressure at the test position cannot be tested.

[0005] Referring to the patent publication number CN103792079A, a nozzle characteristic testing device is disclosed, which is used to test aerosol characteristics such as droplet size, droplet velocity, water flow density at different positions, droplet size distribution, etc. of different nozzles at different air pressures and water pressures and different spraying heights. However, it requires manual testing of the water volume in the grid water collector, and the number of grid water collectors is large and there may be measurement deviations. A velocity field diagram is generated by a CCD camera using a light signal generated by a laser generator. Because the test object is in a misty state and there is a problem of light penetration, the liquid velocity at different positions cannot be tested intuitively, and the liquid spray pressure at the test position cannot be tested.

[0006] Referring to the patent publication number CN1743830A, a mixing nozzle test device is disclosed, which can simulate the pressure and flow of each medium when the nozzle is working, and can observe the nozzle spraying situation more intuitively, but it cannot quantitatively describe the unevenness of the nozzle spray; it cannot adjust the angle, height, etc. of the nozzle; it cannot test the liquid injection pressure at the test position.

[0007] Therefore, the existing technology cannot accurately and fully automatically measure the spray unevenness and pressure distribution of different nozzles under different pressures, flows, heights, angles, etc., as well as the spray conditions under the mutual interference of multiple nozzles. Summary of the invention

[0008] An object of the present invention is to provide a method for testing nozzle spray performance, specifically to provide a method for testing the unevenness of nozzle spray flow distribution and the pressure distribution for online quenching of profiles.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

[0010] A nozzle spray performance test method, including nozzle spray flow non-uniformity test, pressure distribution test,

[0011] (1) The unevenness test includes:

[0012] S1a: Prepare a manifold assembly, which includes a plurality of straight tubes arranged in i rows and j columns, with the openings of the straight tubes facing upwards. A pressure sensor is connected to the bottom of each straight tube. Place the nozzle to be tested directly above the manifold assembly.

[0013] Set the height L of the nozzle from the straight pipe and the target pressure value F measured by the pressure sensor s ;

[0014] S1b: The nozzle sprays toward the straight pipe. When the pressure collected by any pressure sensor reaches F s Stop spraying when the nozzle starts spraying and the time t from the start to the end of spraying is recorded. According to the mass m of the liquid in the straight tube ij Get the nozzle flow rate Q ij :

[0015] Qij=(m ij / ρ) / t,

[0016] Where: ρ is the liquid density;

[0017] S1c: Fit the liquid flow distribution equation of the nozzle according to the following formula:

[0018]

[0019] rmax = Ltan(α / 2),

[0020] Where: r ij is the distance from the center of the straight pipe to the axis of the nozzle, α is the spray angle of the nozzle, r max is a function related to L and α, and x and y are fitting indices;

[0021] (2) Pressure distribution test includes:

[0022] S2a: Prepare a manifold assembly, which includes a plurality of straight tubes arranged in i rows and j columns, with the openings of the straight tubes facing upward and covered with caps. A pressure sensor is connected to the bottom of each straight tube. Place the nozzle to be tested directly above the manifold assembly.

[0023] S2b: The nozzle sprays toward the cap on the straight pipe, and the pressure sensor collects the corresponding pressure F of the straight pipe ij , and obtain the pressure distribution of the nozzle.

[0024] 2. The nozzle spray performance test method according to claim 1, characterized in that: in S1b: the pressure F of the straight pipe is collected ij , according to F ij Get the mass m of the liquid in the straight tube ij :

[0025] F ij =m ij g,

[0026] Where: g is the acceleration due to gravity.

[0027] 3. The nozzle spray performance test method according to claim 1, characterized in that: in S1c: x and y are obtained by the following method:

[0028] S10c: Input Qij, r to the following model ij 、r max And initial x, y, initial x, y are 1:

[0029]

[0030] S11c: Set the k value and determine whether the calculated value of the above model is less than k. If so, output x and y. If so, update x and y until the calculated value of the model is less than k.

[0031] Another object of the present invention is to provide a fully automatic nozzle spray performance testing device.

[0032] In order to achieve the above object, the technical solution adopted by the present invention is:

[0033] A nozzle spray performance testing device, comprising:

[0034] Base assembly: used to install the nozzle;

[0035] The liquid collecting pipe assembly comprises a plurality of liquid collecting pipe units, wherein the liquid collecting pipe units comprise straight pipes and caps, wherein one end of the straight pipes is open and the other end is closed, and the plurality of straight pipes are arranged in i rows and j columns, wherein: i and j are both greater than 1, and the opening directions of the plurality of straight pipes are consistent; the caps are used to cover the openings of the straight pipes;

[0036] Test assembly: including a pressure sensor and a signal collector. The bottom of each straight tube is connected to the pressure sensor, and the signal collector is connected to the pressure sensor;

[0037] Liquid supply assembly: used to supply liquid to the nozzle.

[0038] Preferably, the above technical solution has an unevenness test mode and a pressure distribution test mode. When in the unevenness test mode: the nozzle is connected to the base assembly, and the plurality of straight tubes are located directly below the nozzle with their openings facing upward; when in the pressure distribution test mode: the nozzle is connected to the base assembly, and the plurality of straight tubes are located directly below the nozzle with their openings facing upward, and the cap cover is provided at the opening of the straight tube.

[0039] Preferably, in the above technical solution, two adjacent straight tubes are fitted together, and the projection area of ​​the plurality of straight tubes covers the spraying area of ​​the nozzle. This can prevent the sprayed liquid from flowing away from the gaps between the straight tubes and affecting the test accuracy, and on the other hand ensure that the spraying range of the nozzle can be covered.

[0040] Preferably, the above technical solution comprises a base assembly including a base body and a positioning unit connected to the base body, the positioning unit can be adjusted in the horizontal direction and the vertical direction and can be rotated in the horizontal direction, the nozzle is connected to the positioning unit, and the positioning unit can be adjusted at different angles to meet different testing requirements.

[0041] Further preferably, the base body comprises a base body and a first rod, the first rod is connected to the base body, and the first rod extends in a vertical direction;

[0042] The positioning unit includes a first sleeve, a second rod, a second sleeve, a third sleeve, and a pipe. The first sleeve can be movably mounted on the first rod. The second rod is connected to the first sleeve and extends in the horizontal direction. The second sleeve can be movably mounted on the second rod. The third sleeve is connected to the second sleeve. The axis of the third sleeve extends in the horizontal direction, and the extension direction is perpendicular to the extension direction of the second rod. The pipe is rotatably and movably inserted into the third sleeve. One end of the pipe is used to connect the nozzle. The first sleeve, the second sleeve, and the third sleeve are provided with locking components for movement and / or rotation locking.

[0043] Further preferably, the positioning unit comprises a first positioning unit and a second positioning unit, and the first positioning unit and the second positioning unit share a first sleeve, which can be used for performing a double-nozzle (mutual interference) spraying unevenness test.

[0044] Preferably, the above technical solution is such that the liquid supply component includes a pump, a connecting pipe, a pressure gauge, and a flow meter; one end of the connecting pipe is connected to the pump, and the other end is connected to the other end of the pipeline; a switch for controlling the on / off of the connecting pipe is provided on the connecting pipe, and the pressure gauge and flow meter are provided on the connecting pipe.

[0045] Preferably, in the above technical solution, the device further comprises a liquid return component, and the liquid return component is used for recovering the liquid sprayed from the nozzle.

[0046] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0047] The method of the present invention can measure the spraying unevenness and pressure distribution of different types of single nozzles or multiple nozzles under mutual interference under different pressures, flows, angles, heights and the like, with high measurement accuracy; the device of the present invention can complete fully automatic and high-precision measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Attached Figure 1 It is a structural schematic diagram of the device in the present invention;

[0049] Attached Figure 2 It is a structural schematic diagram of the base assembly in the present invention;

[0050] Attached Figure 3 It is a structural schematic diagram of the liquid collecting pipe assembly in the present invention;

[0051] Attached Figure 4 It is a structural schematic diagram of the liquid collecting pipe unit in the present invention (excluding the cap);

[0052] Attached Figure 5 It is a structural schematic diagram of the liquid collecting pipe unit in the present invention (including the cover cap);

[0053] Attached Figure 6 It is a connection diagram of the pressure sensor in the present invention;

[0054] Attached Figure 7 A schematic diagram of the spraying of the nozzle on the manifold assembly;

[0055] Attached Figure 8 is the fitting flow chart of the fitting parameters;

[0056] Attached Fig. 9 Schematic diagram of the device during the double-nozzle jet flow unevenness test.

[0057] In the above attached figure:

[0058] 100, seat body; 101, first rod; 110, first sleeve; 111, second rod; 112, second sleeve; 113, third sleeve; 114, pipeline;

[0059] 2. Liquid collecting pipe assembly; 20. Pipe rack; 21. Straight pipe; 22. Cap;

[0060] 30. Pressure sensor; 31. Signal collector;

[0061] 40. Pump; 410. Rigid pipe; 411. Flexible pipe; 42. Pressure gauge; 43. Flow meter; 44. Switch;

[0062] 5. Liquid return assembly;

[0063] 6. Nozzle. DETAILED DESCRIPTION

[0064] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0066] Embodiment 1:

[0067] like Figure 1 The nozzle spray performance test device shown includes a base assembly, a liquid collecting pipe assembly 2, a test assembly, a liquid supply assembly, a liquid return assembly, etc. 5. Each assembly is described in detail below.

[0068] like Figure 2 As shown, the base assembly is used to install the nozzle, which includes a base body and a positioning unit connected to the base body. The positioning unit can be adjusted in the horizontal direction and the vertical direction and can be rotated in the horizontal direction. The nozzle is connected to the positioning unit, and the positioning unit can be adjusted at different angles to meet different test requirements.

[0069] In one implementation of this embodiment:

[0070] The base body includes a base body 100 and a first rod 101. The lower end of the first rod 101 is connected to the base body 100, and the first rod 101 extends from bottom to top along a vertical direction.

[0071] The positioning unit includes a first sleeve 110 , a second rod 111 , a second sleeve 112 , a third sleeve 113 , and a pipe 114 . Wherein: the first sleeve 110 can be movably sleeved on the first rod 111, the first sleeve 110 is the base of the entire positioning unit, and the positioning unit can be moved and adjusted in the up and down direction through the first sleeve 110; the second rod 111 is fixedly connected to the first sleeve 110 and extends in the horizontal direction; the second sleeve 112 is movably sleeved on the second rod 111; the third sleeve 113 is connected to the second sleeve 112, the axis of the third sleeve 113 extends in the horizontal direction, and the extension direction is perpendicular to the extension direction of the second rod 111; the pipe 114 is rotatably and movably penetrated in the third sleeve 113, one end of the pipe 114 is used to connect the nozzle, and the other end is used to connect the liquid supply component, that is, if the second rod 11 extends in the left and right direction, the pipe 114 extends in the front and back direction, and the position of the pipe 114 in the left and right direction can be adjusted by moving the second sleeve 112, and the position of the pipe 114 in the front and back direction can be adjusted by moving the pipe 114. At the same time, rotating the pipe 114 itself can adjust its rotation angle, so as to meet the position adjustment of the nozzle.

[0072] In addition, locking components, such as locking bolts, for movement and / or rotation locking are provided on the first sleeve 110 , the second sleeve 112 , and the third sleeve 113 .

[0073] In another implementation of the present embodiment: the positioning unit includes a first positioning unit and a second positioning unit, and the first positioning unit and the second positioning unit share a first sleeve 110, that is, moving the first sleeve 110 can simultaneously drive the two positioning units to move, and this structure is mainly used for dual-nozzle (mutual interference) spraying unevenness test.

[0074] like Figure 2-4 As shown: the liquid collecting pipe assembly 2 includes a plurality of liquid collecting pipe units, and the liquid collecting pipe unit includes a pipe rack 20, a straight pipe 21, and a cap 22. Among them: the pipe rack 20 is sleeved outside the straight pipe 21, and all the straight pipes 21 can be connected; the straight pipe 21 is open at one end and closed at the other end, and the plurality of straight pipes 21 are arranged in i rows and j columns, wherein: i, j are both greater than 1, and the opening directions of the plurality of straight pipes 21 are consistent, that is, they can be arranged in a square array as shown in the figure; the cap 22 is used to cover the opening of the straight pipe 21. Whether the cap 22 is used or not depends on what kind of test the device performs on the nozzle. For example, if the unevenness test of the nozzle flow is performed, the cap 22 is removed; if the pressure distribution test of the nozzle flow is performed, the cap 22 is completely covered at the opening of the straight pipe 21.

[0075] In this embodiment: two adjacent straight tubes 21 in the liquid collecting tube assembly 2 are fitted together, and the projection area of ​​the plurality of straight tubes 21 covers the spraying area of ​​the nozzle. On the one hand, this can prevent the sprayed liquid from flowing away from the gaps between the straight tubes 21 and affecting the test accuracy; on the other hand, it ensures that the spraying range of the nozzle can be covered.

[0076] like Figure 1 , 6 As shown: the test assembly includes a pressure sensor 30 and a signal collector 31. The bottom of each straight tube 21 is connected to a pressure sensor 30. The signal collector 31 is connected to the pressure sensor 30 to collect the pressure value measured by the pressure sensor 30.

[0077] like Figure 1 As shown: the liquid supply assembly is used to supply liquid to the nozzle, and the liquid supply assembly includes a pump 40, a connecting pipe, a pressure gauge 42, and a flow meter 43. Among them: the connecting pipe adopts a structure of a rigid pipe 410 and a flexible pipe 411, one end of the rigid pipe 410 is connected to the pump 40, and one end of the flexible pipe 411 is connected to the other end of the pipeline 114. The connecting pipe is provided with a switch 44 for controlling its on and off, and the pressure gauge 42 and the flow meter 43 are arranged on the rigid pipe 410 of the connecting pipe.

[0078] The liquid return assembly 5 is used to recover the liquid sprayed from the nozzle.

[0079] In addition, the device is equipped with control equipment for automated test control and calculation.

[0080] Embodiment 2:

[0081] A method for testing the non-uniformity of a single nozzle spray flow rate is performed using the nozzle spray performance testing device of the first embodiment, and the opening of the straight tube 21 is not covered with a cap 22, such as Figure 1 The following is a detailed description of the test method steps:

[0082] The nozzle 6 to be tested is placed directly above the liquid collecting pipe assembly 2, and the height L between the nozzle 6 and the straight pipe 21 is set. The target pressure value F measured by the pressure sensor 30 is s , where: when the straight pipe 21 is full of water, the maximum pressure measured by the pressure sensor 30 is F max , F s <F max .

[0083] Turn on the pump 40 and the switch 44, and the nozzle 6 sprays the straight pipe 21. When the pressure collected by any pressure sensor 30 reaches F s The spraying is stopped at t, and the time t from the start of spraying to the end of spraying of the nozzle 6 is recorded. The pressure F of the straight pipe 21 is collected by the pressure sensor 30 ij , according to F ij Get the mass m of the liquid in the straight tube ij :

[0084] F ij =m ij g,

[0085] Where: g is the acceleration due to gravity.

[0086] According to the mass m of the liquid in the straight tube 21 ij Get the flow rate Q of nozzle 6 ij :

[0087] Qij=(m ij / ρ) / t,

[0088] Where: ρ is the liquid density.

[0089] Then fit the liquid flow distribution equation of the nozzle according to the following formula:

[0090]

[0091] r max = Ltan(α / 2),

[0092] Where: r ij is the distance from the center of the straight pipe to the axis of the nozzle, α is the spray angle of the nozzle, r max is a function related to L and α, and x and y are fitting indices.

[0093] Since the fitting indices x and y are unknown, it is necessary to first obtain the values ​​of the fitting indices x and y. In this embodiment, Origin software is used for fitting, such as Figure 8 As shown:

[0094] Input Qij, r to the following model ij 、r max And the initial x, y, where: the initial x, y are 1:

[0095]

[0096] Set the k value. If the above model calculation value converges, then k=5. If the above model calculation value does not converge, then k=5+5=10. If it still does not converge, then add 5, and so on, until the model calculation value converges.

[0097] Determine whether the calculated value of the above model is less than k. If it is less than the k value, output x and y. If it is greater than the k value, update x and y until the calculated value of the model is less than the k value.

[0098] After completing the fitting indices x and y, the liquid flow distribution equation of the nozzle can be obtained.

[0099] Embodiment three:

[0100] A method for testing the non-uniformity of a double nozzle spray flow rate, which is basically the same as that of the first embodiment, such as Fig. 9 As shown, the difference is that the mass m of the liquid in the straight tube 21 ij It is the sum of the liquid masses sprayed out by the two nozzles 6.

[0101] Embodiment 4:

[0102] A method for testing the pressure distribution of a single nozzle spray flow rate is provided. The method is performed using the nozzle spray performance testing device of the first embodiment, and a cap 22 is provided at the opening of the straight tube 21. The steps of the testing method are described in detail below:

[0103] The nozzle 6 to be tested is placed directly above the manifold assembly 2 , and the nozzle 6 is adjusted to the target height and angle.

[0104] Turn on the pump 40 and the switch 44, the nozzle 6 sprays the cap 22 on the straight tube 21, and the pressure sensor 30 collects the pressure F corresponding to the straight tube 21. ij , obtain the pressure distribution of a single nozzle 6.

[0105] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A nozzle spray performance testing method, characterized in that: Including nozzle spray flow unevenness test, pressure distribution test, (1) The unevenness test includes: S1a: Prepare a manifold assembly, which includes a plurality of straight tubes arranged in i rows and j columns, with the openings of the straight tubes facing upwards. A pressure sensor is connected to the bottom of each straight tube. Place the nozzle to be tested directly above the manifold assembly. Set the height L of the nozzle from the straight pipe and the target pressure value F measured by the pressure sensor s ; S1b: The nozzle sprays toward the straight pipe. When the pressure collected by any pressure sensor reaches F s Stop spraying when the nozzle starts spraying and the time t from the start to the end of spraying is recorded. According to the mass m of the liquid in the straight tube ij Get the nozzle flow rate Q ij : Qij=(m ij / ρ) / t, Where: ρ is the liquid density; S1c: Fit the liquid flow distribution equation of the nozzle according to the following formula: r max =Ltan(α / 2), Where: r ij is the distance from the center of the straight pipe to the axis of the nozzle, α is the spray angle of the nozzle, r max is a function related to L and α, and x and y are fitting indices; (2) Pressure distribution test includes: S2a: Prepare a manifold assembly, which includes a plurality of straight tubes arranged in i rows and j columns, with the openings of the straight tubes facing upward and covered with caps. A pressure sensor is connected to the bottom of each straight tube. The nozzle to be tested is placed directly above the manifold assembly. S2b: The nozzle sprays toward the cap on the straight tube, and the pressure sensor collects the pressure F corresponding to the straight tube. ij , and obtain the pressure distribution of the nozzle.

2. The nozzle spray performance testing method according to claim 1, characterized in that: In S1b: Collect the pressure F of the straight pipe ij , according to F ij Get the mass m of the liquid in the straight tube ij : F ij =m ij g, Where: g is the acceleration due to gravity.

3. The nozzle spray performance testing method according to claim 1, characterized in that: In S1c: Get x and y by: S10c: Input Qij, r to the following model ij 、r max And the initial x, y, where: the initial x, y are 1: S11c: Set the k value and determine whether the calculated value of the above model is less than k. If it is less than the k value, output x and y. If it is greater than the k value, update x and y until the calculated value of the model is less than the k value.

4. A device for implementing the nozzle spray performance testing method according to any one of claims 1 to 3, characterized in that: include: Base assembly: used to install the nozzle; The liquid collecting pipe assembly comprises a plurality of liquid collecting pipe units, wherein the liquid collecting pipe units comprise straight pipes and caps, wherein one end of the straight pipes is open and the other end is closed, and the plurality of straight pipes are arranged in i rows and j columns, wherein: i and j are both greater than 1, and the opening directions of the plurality of straight pipes are consistent; the caps are used to cover the openings of the straight pipes; Test assembly: including a pressure sensor and a signal collector. The bottom of each straight tube is connected to the pressure sensor, and the signal collector is connected to the pressure sensor; Liquid supply assembly: used to supply liquid to the nozzle.

5. The device according to claim 4, characterized in that: The device has an unevenness test mode and a pressure distribution test mode. When in the unevenness test mode: the nozzle is connected to the base assembly, and the plurality of straight tubes are located directly below the nozzle with their openings facing upward; when in the pressure distribution test mode: the nozzle is connected to the base assembly, and the plurality of straight tubes are located directly below the nozzle with their openings facing upward, and the cap is provided at the opening of the straight tube.

6. The device according to claim 4, characterized in that: Two adjacent straight tubes are fitted together, and the projection area of ​​the plurality of straight tubes covers the spraying area of ​​the nozzle.

7. The device according to claim 4, characterized in that: The base assembly comprises a base body and a positioning unit connected to the base body. The positioning unit can be adjusted in the horizontal direction and the vertical direction and can be rotated in the horizontal direction. The nozzle is connected to the positioning unit.

8. The device according to claim 7, characterized in that: The base body comprises a base body and a first rod, wherein the first rod is connected to the base body and extends in a vertical direction; The positioning unit includes a first sleeve, a second rod, a second sleeve, a third sleeve, and a pipe. The first sleeve can be movably mounted on the first rod. The second rod is connected to the first sleeve and extends in the horizontal direction. The second sleeve can be movably mounted on the second rod. The third sleeve is connected to the second sleeve. The axis of the third sleeve extends in the horizontal direction, and the extension direction is perpendicular to the extension direction of the second rod. The pipe is rotatably and movably inserted into the third sleeve. One end of the pipe is used to connect the nozzle. The first sleeve, the second sleeve, and the third sleeve are provided with locking components for movement and / or rotation locking.

9. The device according to claim 7, characterized in that: The positioning unit comprises a first positioning unit and a second positioning unit, and the first positioning unit and the second positioning unit share the first sleeve.

10. The device according to claim 4, characterized in that: The liquid supply component includes a pump, a connecting pipe, a pressure gauge, and a flow meter. One end of the connecting pipe is connected to the pump, and the other end is connected to the other end of the pipeline. A switch for controlling its on and off is provided on the connecting pipe, and the pressure gauge and flow meter are arranged on the connecting pipe.

11. The device according to claim 4, characterized in that: The device also includes a liquid return component, which is used to recover the liquid sprayed from the nozzle.

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