Nozzle spray performance testing method and device

Abstract

This invention relates to a method and apparatus for testing nozzle spray performance. The non-uniformity testing method involves spraying liquid through a nozzle onto a collecting pipe. The nozzle flow rate is obtained based on the spraying time from start to finish and the mass of liquid in the straight pipe, thus fitting a liquid flow rate distribution equation for the nozzle. The pressure distribution testing method involves spraying liquid through a nozzle onto a cap on a straight pipe, collecting the corresponding pressure in the straight pipe, and obtaining the pressure distribution of the nozzle. The method of this invention can measure the spray non-uniformity and pressure distribution of different types of single nozzles or multiple nozzles interfering with each other under different pressures, flow rates, angles, heights, etc., with high measurement accuracy. The apparatus of this invention can perform fully automatic and high-precision measurements.

Description

Technical Field

[0001] This invention belongs to the field of nozzle performance testing technology, and specifically relates to a nozzle spray performance testing method and apparatus. Background Technology

[0002] In online quenching systems for aluminum alloy profiles, nozzle design is crucial. These nozzles cool the high-temperature profiles by spraying liquids of different shapes (such as fan-shaped, conical, annular, and linear). The spray characteristics of these nozzles, including pressure, angle, and distance, determine the non-uniformity and pressure distribution on the action surface, thus affecting the cooling rate, quenching deformation, and mechanical properties of the profile. Therefore, accurately testing these nozzle characteristics is essential for ensuring the rationality of the quenching process and product quality. However, current technologies can only test flow distribution when measuring nozzle spray non-uniformity, not pressure distribution, which has limitations and potential errors.

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

[0004] See patent CN202420888U for a device for measuring the spatial distribution of mist volume in variable spraying. This device uses a slit cover plate that moves across a mist collection trough to measure the mist volume at different locations on the spray surface. It can also create two-dimensional and three-dimensional spatiotemporal mist volume distribution maps for visual visualization, thus providing a method and basis for evaluating pesticide application effects. However, the distance the cover plate can be moved is not suitable for quantitative measurement; if the distance is inappropriate, it will affect the accuracy of the three-dimensional spatial distribution results. Multiple cover plate movements are cumbersome; the mist volume needs to be measured manually, which may introduce measurement errors; and it cannot test the liquid injection pressure at the test location.

[0005] See the patent with publication number CN103792079A, which discloses a nozzle characteristic testing device to test the aerosol characteristics of different nozzles under different air and water pressures and different spray heights, such as droplet size, droplet velocity, water flow density at different positions, and droplet size distribution. However, it requires manual testing of the water volume of the grid collector, which has a large number of grid collectors and may have measurement deviations. Using a CCD camera, a velocity field map is generated using light signals generated by a laser generator. However, because the test object is in the form of mist, there is a problem of light penetration, so it is not possible to directly test the liquid velocity at different positions, nor can it test the liquid spray pressure at the test position.

[0006] See the patent with publication number CN1743830A, which discloses a mixed nozzle testing device that can simulate the pressure and flow rate of various media when the nozzle is working and can observe the nozzle spray situation relatively intuitively. However, it cannot quantitatively describe the non-uniformity of the nozzle spray; it cannot adjust the nozzle angle, height, etc.; and it cannot test the liquid spray pressure at the test position.

[0007] Therefore, existing technologies cannot accurately and automatically measure the unevenness of spraying from different nozzles and the pressure distribution under different pressure, flow rate, height, and angle conditions, as well as the spraying situation under the mutual interference of multiple nozzles. Summary of the Invention

[0008] One objective of this invention is to provide a method for testing nozzle spraying performance, specifically a method for testing the non-uniformity of nozzle spraying flow distribution and pressure distribution for online quenching of profiles.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A method for testing nozzle injection performance includes testing nozzle injection flow non-uniformity and pressure distribution.

[0011] (1) Conducting non-uniformity testing includes:

[0012] S1a: Prepare the liquid collection tube assembly, which includes multiple straight tubes arranged in row i and column j, 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 liquid collection tube assembly.

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

[0014] S1b: The nozzle sprays water into the straight pipe. When any pressure sensor collects a pressure of F... s Stop spraying when the time is right, and record the time t from the start to the end of spraying. Then, determine the mass m of the liquid in the straight pipe. ij Obtain the flow rate Q of the nozzle 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 Let α be the distance from the center of the straight pipe to the nozzle axis, and r be the nozzle spray angle. max Let L and α be functions related to L and α, and let x and y be the fit indices.

[0021] (2) Pressure distribution testing includes:

[0022] S2a: Prepare the collection tube assembly, which includes multiple straight tubes arranged in row i and column j, with the openings of the straight tubes facing upwards 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 collection tube assembly.

[0023] S2b: The nozzle sprays water onto the cap on the straight pipe, and the pressure sensor collects the corresponding pressure F in the straight pipe. ij This allows us to obtain the pressure distribution of the nozzle.

[0024] 2. The nozzle injection performance testing method according to claim 1, characterized in that: in S1b: the pressure F of the straight pipe is collected. ij According to F ij Obtain the mass m of the liquid in the straight pipe ij :

[0025] F ij =m ij g,

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

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

[0028] S10c: Input Qij, r into the following model ij r max And initial x and y, both of which are 1:

[0029]

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

[0031] Another objective of this invention is to provide a fully automatic nozzle spray performance testing device.

[0032] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

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

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

[0035] Liquid collecting tube assembly: includes multiple liquid collecting tube units, each liquid collecting tube unit including a straight tube and a cap, wherein one end of the straight tube is open and the other end is closed, and the multiple straight tubes are arranged in i rows and j columns, wherein i and j are both greater than 1, and the opening directions of the multiple straight tubes are consistent; the cap is used to cover the opening of the straight tube.

[0036] Test components include pressure sensors and signal acquisition devices. Each straight pipe is connected to the bottom of the pressure sensor, and the signal acquisition device is connected to the pressure sensor.

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

[0038] Preferably, the above technical solution includes a non-uniformity test mode and a pressure distribution test mode. In the non-uniformity test mode, the nozzle is connected to the base assembly, and multiple straight tubes are located directly below the nozzle with their openings facing upwards. In the pressure distribution test mode, the nozzle is connected to the base assembly, and multiple straight tubes are located directly below the nozzle with their openings facing upwards. The cap is placed over the opening of the straight tube.

[0039] Preferably, in the above technical solution, two adjacent straight pipes are fitted together, and the projected area of ​​the multiple straight pipes covers the spray area of ​​the nozzle. This can prevent the sprayed liquid from flowing away from the gaps between the straight pipes and affecting the test accuracy, and ensure that the spray range of the nozzle can be covered.

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

[0041] More preferably, the base body includes a seat and a first rod, the first rod being connected to the seat and extending 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 is movably fitted onto the first rod. The second rod is connected to the first sleeve and extends horizontally. The second sleeve is movably fitted onto the second rod. The third sleeve is connected to the second sleeve, and the axis of the third sleeve extends horizontally, with its extension direction perpendicular to the extension direction of the second rod. The pipe is rotatably and movably inserted into the third sleeve, and one end of the pipe is used to connect to a nozzle. The first sleeve, second sleeve, and third sleeve are provided with locking components for movement and / or rotation locking.

[0043] More preferably, the positioning unit includes a first positioning unit and a second positioning unit, wherein the first positioning unit and the second positioning unit share a first sleeve, which can be used to perform a test on the non-uniformity of dual-nozzle (mutual interference) spraying.

[0044] Preferably, in the above technical solution, the liquid supply assembly 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 / off state is provided on the connecting pipe, and the pressure gauge and flow meter are installed on the connecting pipe.

[0045] Preferably, the above technical solution further includes a liquid return component, which is used to recover the liquid ejected 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 spray non-uniformity and pressure distribution of different types of single nozzles or multiple nozzles under different pressure, flow rate, angle, height and other conditions under mutual interference, with high measurement accuracy; the device of the present invention can complete fully automatic and high-precision measurement. Attached Figure Description

[0048] Appendix Figure 1 This is a schematic diagram of the device in this invention;

[0049] Appendix Figure 2 This is a schematic diagram of the base assembly in this invention;

[0050] Appendix Figure 3 This is a schematic diagram of the structure of the liquid collection pipe assembly in this invention;

[0051] Appendix Figure 4 This is a structural schematic diagram of the liquid collection tube unit in this invention (excluding the cap);

[0052] Appendix Figure 5 This is a schematic diagram of the structure of the liquid collection tube unit in this invention (including the cap);

[0053] Appendix Figure 6 This is a schematic diagram of the connection of the pressure sensor in this invention;

[0054] Appendix Figure 7 This is a schematic diagram of the nozzle spraying onto the liquid collection pipe assembly.

[0055] Appendix Figure 8 The flowchart shows the fitting process for the fitting parameters;

[0056] Appendix Figure 9 This is a schematic diagram of the device during the test of uneven flow rate in dual-nozzle jetting.

[0057] In the attached diagrams above:

[0058] 100. Base; 101. First rod; 110. First sleeve; 111. Second rod; 112. Second sleeve; 113. Third sleeve; 114. Pipe;

[0059] 2. Liquid collection tube assembly; 20. Tube rack; 21. Straight tube; 22. Cap;

[0060] 30. Pressure sensor; 31. Signal acquisition device;

[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 Implementation

[0064] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0065] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0066] Example 1:

[0067] like Figure 1 The nozzle spray performance testing device shown includes a base assembly, a liquid collection pipe assembly 2, a testing assembly, a liquid supply assembly, a liquid return assembly, etc. 5. The following is a detailed description of each component.

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

[0069] In one implementation of this embodiment:

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

[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. The system comprises: a first sleeve 110 movably fitted onto a first rod 111, serving as the base of the entire positioning unit and allowing the positioning unit to be adjusted vertically via the first sleeve 110; a second rod 111 fixedly connected to the first sleeve 110 and extending horizontally; a second sleeve 112 movably fitted onto the second rod 111; a third sleeve 113 connected to the second sleeve 112, with its axis extending horizontally and perpendicular to the extension direction of the second rod 111; and a pipe 114 rotatably and movably inserted within the third sleeve 113, with one end of the pipe 114 connected to a nozzle and the other end connected to a liquid supply assembly. In other words, if the second rod 11 extends horizontally, the pipe 114 extends vertically. Moving the second sleeve 112 adjusts the position of the pipe 114 horizontally, and moving the pipe 114 adjusts its position vertically. Simultaneously, rotating the pipe 114 adjusts its rotation angle, thereby satisfying the nozzle's position adjustment.

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

[0073] In another embodiment of this example: the positioning unit includes a first positioning unit and a second positioning unit. 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. This structure is mainly used for testing the non-uniformity of dual-nozzle (mutual interference) spraying.

[0074] like Figure 2-4 As shown: The liquid collecting tube assembly 2 includes multiple liquid collecting tube units, each including a tube frame 20, straight tubes 21, and caps 22. Specifically: the tube frame 20 is fitted over the straight tubes 21, connecting all the straight tubes 21; each straight tube 21 is open at one end and closed at the other, with multiple straight tubes 21 arranged in rows i and columns j, where i and j are both greater than 1, and the opening directions of the multiple straight tubes 21 are consistent, thus forming a square array as shown in the figure; the caps 22 are used to cover the openings of the straight tubes 21. Whether or not the caps 22 are used depends on the type of nozzle test being performed. For example, if a nozzle flow rate non-uniformity test is being performed, the caps 22 are removed; if a nozzle flow rate pressure distribution test is being performed, all the caps 22 are placed over the openings of the straight tubes 21.

[0075] In this embodiment, two adjacent straight pipes 21 in the liquid collection pipe assembly 2 are fitted together, and the projected area of ​​the multiple straight pipes 21 covers the spray area of ​​the nozzle. On the one hand, this can prevent the sprayed liquid from flowing away from the gap between the straight pipes 21 and affecting the test accuracy, and on the other hand, it can ensure that the spray range of the nozzle is covered.

[0076] like Figure 1 , 6 As shown: The test assembly includes a pressure sensor 30 and a signal acquisition unit 31. Each straight tube 21 is connected to a pressure sensor 30 at its bottom. The signal acquisition unit 31 is connected to the pressure sensor 30 and is used to acquire 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. 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. A switch 44 is installed on the connecting pipe to control its on / off state. The pressure gauge 42 and the flow meter 43 are installed on the rigid pipe 410 of the connecting pipe.

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

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

[0080] Example 2:

[0081] A test method for single-nozzle jet flow non-uniformity testing is provided. This method uses the nozzle jet performance testing device described in Example 1, and the opening of the straight pipe 21 is not covered with a cap 22. Figure 1 As shown. The following details the steps of the testing method:

[0082] Place the nozzle 6 to be tested directly above the liquid collection tube assembly 2, set the height L of the nozzle 6 from the straight tube 21, and measure the target pressure value F from the pressure sensor 30. s Among them: when the straight pipe 21 is full of water, the pressure sensor 30 measures a maximum pressure of F. max F s <F max .

[0083] When pump 40 and switch 44 are turned on, nozzle 6 sprays water into straight pipe 21. When any pressure sensor 30 collects pressure reaching F... s Stop spraying when the spraying stops, record the time t from the start to the end of spraying from nozzle 6, and collect the pressure F of straight pipe 21 through pressure sensor 30. ij According to F ij Obtain the mass m of the liquid in the straight pipe ij :

[0084] F ij =m ij g,

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

[0086] Based on the mass m of the liquid in straight pipe 21 ij Obtain 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 Let α be the distance from the center of the straight pipe to the nozzle axis, and r be the nozzle spray angle. max Let L be a function related to L and α, and let x and y be the fit indices.

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

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

[0095]

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

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

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

[0099] Example 3:

[0100] A test method for testing the non-uniformity of jet flow rate in a dual-nozzle system is provided, which is basically the same as that in Example 1, such as... Figure 9 As shown, the difference lies in the mass m of the liquid inside the straight pipe 21. ij This represents the total mass of liquid ejected from the two nozzles 6.

[0101] Example 4:

[0102] A method for testing the pressure distribution of a single nozzle injection flow rate is disclosed. This method employs the nozzle injection performance testing device described in Example 1, and caps 22 are placed over the openings of the straight pipe 21. The steps of the testing method are described in detail below:

[0103] Place the nozzle 6 to be tested directly above the liquid collection tube assembly 2, and adjust the nozzle 6 to the target height and angle.

[0104] When pump 40 and switch 44 are turned on, nozzle 6 sprays water onto cap 22 on straight pipe 21, and pressure sensor 30 collects the pressure F corresponding to straight pipe 21. ij This allows for the acquisition of pressure distribution from a single nozzle 6.

[0105] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for testing nozzle injection performance, characterized in that: This includes testing for nozzle jet flow non-uniformity and pressure distribution. (1) The non-uniformity test includes: S1a: Prepare the liquid collection tube assembly, which includes... i OK, j Multiple straight tubes are arranged in a row, with their openings facing upwards. A pressure sensor is connected to the bottom of each straight tube. The nozzle to be tested is placed directly above the liquid collection tube assembly. Set the height of the nozzle from the straight pipe L The target pressure value measured by the pressure sensor F s ; S1b: The nozzle sprays water into the straight pipe. When any pressure sensor collects a pressure reaching... F s Stop spraying when the time is right and record the time from the start to the end of spraying. t Based on the mass of the liquid in the straight pipe m ij Obtain the flow rate of the nozzle Q ij : Qij =（ m ij / ρ ） / t ， in: ρ The density of the liquid; S1c: Fit the liquid flow distribution equation of the nozzle according to the following formula: ， ， in: r ij This is the distance from the center of the straight pipe to the nozzle axis. α The nozzle's spray angle. r max For L , α Related functions, x , y The fitting index; (2) Pressure distribution testing includes: S2a: Prepare the liquid collection tube assembly, which includes... i OK, j Multiple straight tubes are arranged in a row, with their openings facing upwards and covered by caps. A pressure sensor is connected to the bottom of each straight tube. The nozzle to be tested is placed directly above the liquid collection tube assembly. S2b: The nozzle sprays water onto the cap on the straight pipe, and the pressure sensor collects the corresponding pressure on the straight pipe. F ij This allows us to obtain the pressure distribution of the nozzle.

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

3. The nozzle injection performance testing method according to claim 1, characterized in that: In S1c: Obtained through the following methods x , y : S10c: Input to the following model Qij , r ij , r max and initial x , y , where: initial x , y All are 1: ∑ ， S11c: Settings k The value is used to determine whether the calculated value of the above model is less than [a certain value]. k If less than k If the value is true, then output the value. x , y If greater than k If the value is not updated, then update. x , y until the calculated value of the model is less than k value.

4. An apparatus for implementing the nozzle injection performance testing method according to any one of claims 1 to 3, characterized in that: include: Base assembly: used to mount the nozzle; Liquid collecting tube assembly: includes multiple liquid collecting tube units, each liquid collecting tube unit comprising a straight tube and a cap, wherein one end of the straight tube is open and the other end is closed, and the multiple straight tubes are arranged in a manner that... i OK, j Column arrangement, of which: i , j All are greater than 1, and the opening directions of the multiple straight pipes are consistent; the cap is used to cover the opening of the straight pipe. Test components include pressure sensors and signal acquisition devices. Each straight pipe is connected to the bottom of the pressure sensor, and the signal acquisition device is connected to the pressure sensor. Liquid supply assembly: Used to supply liquid to the nozzle.

5. The apparatus according to claim 4, characterized in that: The device has a non-uniformity test mode and a pressure distribution test mode. In the non-uniformity test mode, the nozzle is connected to the base assembly, and multiple straight tubes are located directly below the nozzle with their openings facing upwards. In the pressure distribution test mode, the nozzle is connected to the base assembly, and multiple straight tubes are located directly below the nozzle with their openings facing upwards. The cap is placed over the opening of the straight tube.

6. The apparatus according to claim 4, characterized in that: The two adjacent straight pipes are fitted together, and the projected area of ​​the multiple straight pipes covers the spray area of ​​the nozzle.

7. The apparatus according to claim 4, characterized in that: The base assembly includes a base body and a positioning unit connected to the base body. The positioning unit is adjustable in the horizontal and vertical directions and can rotate in the horizontal direction. The nozzle is connected to the positioning unit.

8. The apparatus according to claim 7, characterized in that: The base body includes a base and a first rod, the first rod being connected to the base and extending 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 is movably fitted onto the first rod. The second rod is connected to the first sleeve and extends horizontally. The second sleeve is movably fitted onto the second rod. The third sleeve is connected to the second sleeve, and the axis of the third sleeve extends horizontally, with its extension direction perpendicular to the extension direction of the second rod. The pipe is rotatably and movably inserted into the third sleeve, and one end of the pipe is used to connect to a nozzle. The first sleeve, second sleeve, and third sleeve are provided with locking components for movement and / or rotation locking.

9. The apparatus according to claim 8, characterized in that: 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.

10. The apparatus according to claim 8, characterized in that: The liquid supply assembly 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 is installed on the connecting pipe to control its on / off state. The pressure gauge and flow meter are installed on the connecting pipe.

11. The apparatus according to claim 4, characterized in that: The device also includes a liquid return assembly for recovering liquid ejected from the nozzle.

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