Centrifugal nozzle performance test bench capable of being quickly assembled and disassembled

Abstract

The invention relates to a centrifugal nozzle performance test bench capable of being quickly assembled and disassembled. The test bench comprises a nozzle assembling and disassembling mechanism, a height adjusting mechanism, an intelligent regulation and control system, a test platform module and a power supply system, the nozzle loading and unloading mechanism takes a three-jaw chuck as a main body to realize rapid loading and unloading of a centrifugal nozzle; the height adjusting mechanism controls a ball screw to vertically move by rotating a rocker and drives the centrifugal nozzle to synchronously lift; the intelligent regulation and control system realizes closed-loop control of the rotating speed of the nozzle; the test platform module monitors the rotating speed, the flow and the fog drop particle size spectrum in real time; the power supply system supplies power to the test bench through the detachable interface, and continuous work of the system is guaranteed. According to the invention, nozzle rotating speed adjustment, flow calibration and droplet particle size spectrum measurement are integrated, which is beneficial for improving the accuracy of centrifugal nozzle performance test and optimizing the spraying quality; and meanwhile, rapid disassembly and assembly and height adjustment of the tested centrifugal spray head are realized, the efficiency of testing the centrifugal spray head is improved, and the device is particularly suitable for an automatic test scene combined with a Malvern particle size analyzer.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery testing equipment, and specifically to a centrifugal nozzle performance test bench that can be quickly assembled and disassembled. The bench integrates nozzle speed regulation, flow calibration, and droplet size spectrum measurement, and is particularly suitable for automated testing scenarios in conjunction with a Malvern particle size analyzer. Background Art

[0002] Droplet spray produced by centrifugal nozzles of varying performance significantly impacts the uniformity of spray solution adhesion to the crop surface, deposition within the canopy, and droplet drift. Accurately testing centrifugal nozzle performance is key to improving spray system efficiency and optimizing spray quality. Existing technology labs rarely conduct comprehensive testing of centrifugal nozzles, and fail to consider their rapid assembly and disassembly.

[0003] There is a patent for a centrifugal atomization comprehensive performance test bench (application number CN200720038131.4). The motor drives the centrifugal nozzle to rotate at high speed, and the fan provides different wind speeds and air volumes to the nozzle through the wind tube, thereby completing various centrifugal atomization nozzle test tests. The centrifugal nozzle is equipped with a matching brushless motor. This test bench only considers the performance design of the nozzle itself, and does not take the centrifugal nozzle as a whole into consideration. Considering the mechanical complexity of the test bench, the time cost of replacing different test nozzles increases accordingly.

[0004] A patent for a water mist nozzle flow rate testing device (application number CN202510092956.7) mainly focuses on water mist nozzle flow rate testing and lacks testing of other performance of centrifugal nozzles.

[0005] Therefore, it is urgent to design a centrifugal nozzle performance test bench that integrates nozzle speed adjustment, flow calibration and droplet size spectrum measurement. Summary of the Invention

[0006] In response to the shortcomings of the prior art, the purpose of the present invention is to provide a centrifugal nozzle performance test bench that can be quickly assembled and disassembled, integrating nozzle speed adjustment, flow calibration and droplet size spectrum measurement, and measuring the droplet size spectrum under different speed and flow conditions of the centrifugal nozzle. It is particularly suitable for automated testing scenarios in conjunction with a Malvern particle size analyzer.

[0007] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0008] A centrifugal nozzle performance test bench that can be quickly assembled and disassembled includes: a nozzle assembly and disassembly mechanism, an intelligent control system, a height adjustment mechanism, a test platform mechanism, and a power supply system;

[0009] The nozzle loading and unloading mechanism includes an integrated platform 3, on which a movable chuck 1 and a terminal 2 are fixed; the nozzle loading and unloading mechanism is used for quick loading and unloading of the centrifugal nozzle;

[0010] The intelligent control system is provided on the integrated platform 3; the intelligent control system includes a main control chip 8, a rotary encoder 9 and a brushless electric regulator 10, forming a closed-loop control circuit; the brushless electric regulator 10 is connected to the terminal 2 and to the centrifugal nozzle motor; the rotary encoder 9 is used to set the reference speed; the intelligent control system is used to achieve closed-loop control of the nozzle speed;

[0011] The height adjustment mechanism includes a support base 4, which is fixedly connected to the integrated platform 3; a ball screw 7 is spirally sleeved on the support base 4, and the top of the ball screw 7 is fixedly connected to the integrated platform 3; the ball screw 7 is meshed with a helical gear set 5, and the helical gear set 5 is transmission-connected to a rocker 6, and the rocker 6 drives the helical gear 5 to rotate, driving the ball screw 7 to move in the vertical direction; the height adjustment mechanism is used to drive the centrifugal nozzle to rise and fall synchronously in the vertical direction;

[0012] The flow test platform mechanism includes a water pump 11, which is connected to a flow meter 12 via a medicine tube. The water pump 11 and the flow meter 12 are fixed to one end of the integrated platform 3; the flow test platform mechanism also includes a display screen 13, which is fixed to one end of the integrated platform 3 and electrically communicates with the main control chip 8; the flow meter 12 is electrically connected to the intelligent control system; the test platform mechanism is used for real-time monitoring of the centrifugal nozzle speed, flow rate and droplet size spectrum;

[0013] The power supply system is detachable to supply power to the test bench;

[0014] The test bench enables different types of centrifugal nozzles to be adapted to the Malvern particle size analyzer.

[0015] Preferably, the jaw spacing of the movable chuck 1 is adjusted by a screw, and the inner diameter of the chuck 1 is 65 mm, which is suitable for a centrifugal nozzle with a diameter of 10-60 mm.

[0016] Preferably, the main control chip 8 is STM32C8T6, which outputs a 50 Hz PWM signal with a duty cycle of 10%-20% and an effective level of 10ms-20ms.

[0017] Preferably, the rotary encoder is an EC11 rotary encoder.

[0018] Preferably, the brushless ESC 10 is a Hobbywing 40A brushless ESC, which supports 50Hz PWM signal input and has a speed fluctuation rate of <±1%.

[0019] Preferably, the ball screw 7 has a stroke of 20 mm, is made of 304 stainless steel, and has a bearing capacity of ≥50 kg;

[0020] The single helical gear 5 has a diameter of 40 mm and a transmission ratio of 1:1.

[0021] Preferably, the support seat 4 has a height adjustment range of 55-75 mm and an anodized surface.

[0022] Preferably, the flow meter 12 has an accuracy of ±1% and a measuring range of 0.5-12 L / min.

[0023] Preferably, the display screen 13 has a resolution of 128×64 pixels, displays the rotation speed in real time, and supports MODBUS protocol data export.

[0024] Preferably, the power supply system includes a 6S lithium battery 14 for powering the centrifugal nozzle; and a 5V lithium battery 15 for powering the main control chip 8.

[0025] The beneficial effects of the present invention are:

[0026] The centrifugal nozzle performance test bench of the present invention can be quickly assembled and disassembled, realizes the flexible adjustment of the nozzle speed and flow rate, and obtains the droplet particle size spectrum of the centrifugal nozzle under different conditions. The centrifugal motor in the centrifugal nozzle is included in the test range, focusing on the overall performance and quick assembly and disassembly of the centrifugal nozzle, and providing a certain technical reference for the reasonable configuration of nozzle parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 The overall schematic diagram of the centrifugal nozzle performance test bench that can be quickly assembled and disassembled according to the present invention

[0029] Figure 2 Schematic diagram of the lifting part of the height adjustment mechanism

[0030] Figure 3 Schematic diagram of electronic control of intelligent control system

[0031] In the figure: chuck 1, terminal 2, integrated platform 3, support base 4, helical gear set 5, rocker 6, ball screw 7, main control chip 8, brushless ESC 9, rotary encoder 10, water pump 11, electronic digital flow meter 12, display 13, 6S lithium battery 14, 5V lithium battery 15 DETAILED DESCRIPTION

[0032] The following describes preferred embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the following embodiments are provided for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art may make various modifications and substitutions to the present invention without departing from the purpose and spirit of the present invention.

[0033] The present invention provides a centrifugal nozzle performance test bench that can be quickly assembled and disassembled. It integrates nozzle speed regulation, flow calibration and droplet size spectrum measurement. It can measure the droplet size spectrum under different speed and flow conditions of the centrifugal nozzle and is particularly suitable for automated testing scenarios in conjunction with a Malvern particle size analyzer.

[0034] like Figure 1 The figure shows an overall schematic diagram of the test bench of the present invention. The present invention provides a centrifugal nozzle performance test bench that can be quickly assembled and disassembled, including a nozzle assembly and disassembly mechanism, a height adjustment mechanism, an intelligent control system, a test platform module, and a power supply system.

[0035] The nozzle loading and unloading mechanism comprises: a movable three-jaw chuck 1, a JXZ-1 type terminal 2 and an integrated platform 3, on which the movable three-jaw chuck 1 and the JXZ-1 type terminal 2 are fixed.

[0036] The jaw spacing of the movable three-jaw chuck 1 is adjusted by a screw, with an inner diameter of 65mm, suitable for centrifugal nozzles with a diameter of 10-60mm; the JXZ-1 type terminal 2 is connected to the intelligent control system through an aviation plug to quickly connect the centrifugal motor electrode; the integrated platform 3 is 43mm long and wide and 15mm thick. The intelligent control system is integrated on the platform 3, and the surface is chrome-plated for corrosion resistance and easy cleaning.

[0037] like Figure 2 As shown, the height adjustment mechanism includes: an aluminum alloy support base 4, two sets of helical gear sets 5, a rocker 6 and two ball screws 7.

[0038] The aluminum alloy support base 4 is fixedly connected to the integrated platform 3. Two sets of ball screws 7 are screwed onto the support base 4. These two ball screws 7 are screwed into the threaded holes of the aluminum alloy support base 4. The ball screws 7 have a stroke of 20 mm and are made of 304 stainless steel with a load capacity of ≥50 kg. The integrated platform 3 is mounted to the top of the ball screws 7. The ball screws 7 are meshed with corresponding matching helical gear sets 5. Each helical gear has a diameter of 40 mm and a transmission ratio of 1:1. The helical gear sets 5 are connected to a rocker 6, which drives the rotating helical gears 5, displacing the ball screws 7 vertically. The aluminum alloy support base 4, with an anodized surface, has an outer diameter of 24 mm, a movable inner rod diameter of 20 mm, and a height adjustment range of 55-75 mm. This provides enhanced load-bearing stability, effectively adapting different models of centrifugal nozzles to the Malvern particle size analyzer. Adjust the transmission of the helical gear sets 5 to verify the vertical displacement linearity of the ball screws 7.

[0039] The intelligent control system includes: STM32C8T6 main control chip 8, rotary encoder 9 and 40A brushless electric speed regulator 10, which are connected by etching circuit board to form a closed loop control circuit. Figure 3 As shown in the figure, the rotary encoder is an EC11 rotary encoder; the brushless ESC 10 is a Hobbywing 40A brushless ESC. The 40A brushless ESC 10 is connected to JXZ-1 terminal 2 via an aviation plug and is also connected to the centrifugal nozzle motor. The STM32C8T6 main control chip 8 communicates with the rotary encoder 9 via the UART protocol, outputting a 50Hz PWM signal with a duty cycle of 10%-20% and an effective level of 10ms-20ms. The brushless ESC 10 supports 50Hz PWM signal input and uses a closed-loop control algorithm, with a speed fluctuation rate of less than ±1%. The reference speed is set using the rotary encoder 9.

[0040] The flow test platform module includes: CSP48180XW water pump 11, K24 electronic digital flow meter 12 and OLED display 13, which supports real-time monitoring of rotation speed, flow rate and droplet size spectrum.

[0041] A K24 electronic flowmeter 12 is connected to a CSP48180XW water pump 11 via a 6mm tubing and fixed to the side of the integrated platform 3. An OLED display 13 is located at the front of the integrated platform 3 and communicates with the STM32 main control chip 8 via an RS485 bus. The K24 flowmeter 12 is calibrated using a standard flow calibration device, ensuring an accuracy of ±1%.

[0042] The K24 electronic flow meter 12 has a measuring range of 0.5-12 L / min; the OLED display 13 has a size of 0.94 inches and a resolution of 128×64 pixels, displays the rotation speed in real time, and is electrically connected to the intelligent control system; the RS485 communication interface supports MODBUS protocol data export.

[0043] The power supply system includes: a 6S lithium battery 14 and a 5V lithium battery 15, which are configured to supply power to the test bench through a detachable interface.

[0044] A 6S lithium battery 14 with a capacity of 1300 mAh and support for fast charging is used to power the centrifugal nozzle; a 5V lithium battery 15 is used to power the STM32C8T6 main control chip 8.

[0045] The K24 electronic flow meter 12, the OLED display screen 13, the format 6S lithium battery 14, and the 5V lithium battery 15 are all connected to the intelligent control system.

[0046] like Figure 3 The figure shows the electronic control schematic diagram of the intelligent control system.

[0047] The method for deploying the centrifugal nozzle performance test bench capable of rapid assembly and disassembly of the present invention comprises the following steps:

[0048] S1. Place the centrifugal nozzle performance test bench in the middle of the Malvern particle size analyzer so that the integrated platform 3 is parallel to the ground, and turn the rocker 6 so that the centrifugal nozzle height is about 50 mm above the analyzer;

[0049] S2. Clamp the centrifugal nozzle to be tested on the three-jaw chuck 1, connect the electrode to the terminal 2, and turn on the power switch of the STM32C8T6 main control chip 8;

[0050] S3. Adjust the rotary encoder until the OLDE display 13 shows the maximum value, turn on the centrifugal nozzle power, and adjust the rotary encoder 10 to the OLDE screen 13 showing the minimum value within 3 seconds after hearing the "beep" sound. The speed range setting is completed.

[0051] S4. Turn on the power of the water pump 11, adjust the rotary encoder 10, so that the centrifugal nozzle reaches the set operating speed, the electronic digital flow meter 12 measures the liquid flow rate, and the Malvern particle size analyzer tests the droplet size distribution.

[0052] Example: Performance Measurement of Various Centrifugal Spray Heads

[0053] Various centrifugal nozzle models were used for rapid assembly and disassembly testing, while their performance was simultaneously tested and evaluated. A Malvern laser particle size analyzer was used to measure particle size. When a laser beam passes through a dispersed particle sample, the intensity of scattered light is measured. The data is then used to analyze and calculate the particle size distribution that forms the scattering pattern. A qualified centrifugal nozzle must be verified through precise speed regulation, accurate flow calibration, and a reasonable particle size profile. This test bench incorporates these testing conditions. A three-jaw chuck, controlled by a rotating handle, synchronizes the radial movement of the three jaws, enabling automatic centering, clamping, and loosening of the nozzle, allowing for rapid assembly and disassembly of centrifugal nozzles of varying diameters. Plug-in terminals allow for quick electrical connection, while an independent flow measurement system allows for quick connection to the water line. These three features work together to enable rapid assembly and disassembly of centrifugal nozzles. The three-jaw chuck's self-centering mechanism ensures high concentricity, while the flow measurement system displays real-time flow rate. The adjustable range and height adjustment of the three-jaw chuck accommodate centrifugal nozzles of varying sizes, meeting all the requirements for testing centrifugal nozzles.

[0054] Continuously replace 5 different types of centrifugal nozzles, change the centrifugal nozzle speed, liquid flow rate, and test bench height to verify whether the test bench is efficient and reliable.

[0055] Experimental steps:

[0056] 1. Record the initial time t0, install the 10mm diameter nozzle on the three-jaw chuck 1, tighten the screw to a contact torque of 5N·m, and turn the rocker to adjust the test bench to the appropriate height;

[0057] 2. Adjust the rotary encoder 9 to the maximum value displayed on the OLDE screen 12, turn on the power of the centrifugal nozzle, and adjust the rotary encoder to the minimum value displayed on the OLDE screen within 3 seconds after hearing the "beep" sound.

[0058] 3. Start the water pump 11, adjust the flow rate to 3L / min, and turn it off after stabilizing for 30 seconds. During this period, smoothly rotate the encoder 9;

[0059] 4. Remove the nozzle and record the time t1;

[0060] 5. Repeat steps 1-4 and replace different types of centrifugal nozzles in turn.

[0061] Test results:

[0062]

[0063] t i (i=1, 2, 3, 4, 5): The time point after the installation of the i-th type of nozzle is completed (unit: seconds). For example, t1 is the time after the installation of the first nozzle, t2 is the time after the installation of the second nozzle, and so on;

[0064] D 实际 : The actual measured concentricity deviation of the nozzle (unit: mm), which refers to the radial offset between the rotation axis of the nozzle and the main axis of the test bench after the nozzle is installed;

[0065] D 标称 : Concentricity deviation of the nozzle design or standard (unit: mm), given by the manufacturer;

[0066] D 实际 -D 标称 : The absolute difference between the actual deviation and the nominal deviation (unit: mm), reflecting the size of the installation error;

[0067] Table 1 Actual test results of continuously replacing 5 different types of centrifugal nozzles

[0068]

[0069]

[0070] The three-jaw chuck synchronously controls the radial movement of the three jaws by rotating the handle, realizing automatic centering, clamping and loosening of the nozzle, and quickly loading and unloading centrifugal nozzles of different diameters. The circuit is quickly connected using plug-in terminals, and the water line is quickly connected through an independent flow test system. The three work together to realize the rapid loading and unloading of the centrifugal nozzle. The results show that the average replacement time is 27.42 seconds, the replacement time is ≤30s, the average concentricity error is 0.0246mm, and the concentricity error is ≤0.05mm. The mechanical structure of the test bench is reliable. The adjustable range and height adjustment mechanism of the three-jaw chuck are compatible with centrifugal nozzles of different sizes. No special conditions such as mechanical damage or circuit abnormality occurred during the process, which meets the design requirements of versatility.

[0071] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0072] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A centrifugal nozzle performance test bench that can be quickly assembled and disassembled, characterized in that: include: Nozzle loading and unloading mechanism, intelligent control system, height adjustment mechanism, flow test platform mechanism, power supply system; The nozzle assembly and disassembly mechanism comprises an integrated platform (3), on which a movable chuck (1) and a terminal (2) are fixedly provided; the nozzle assembly and disassembly mechanism is used for rapid assembly and disassembly of the centrifugal nozzle; The intelligent control system is arranged on the integrated platform (3); the intelligent control system comprises an electrically connected main control chip (8), a rotary encoder (9) and a brushless electric regulator (10), forming a closed-loop control circuit; the brushless electric regulator (10) is connected to the terminal (2) and to the centrifugal nozzle motor; the rotary encoder (9) is used to set a reference speed; the intelligent control system is used to achieve closed-loop control of the nozzle speed; The height adjustment mechanism comprises a support seat (4), the support seat (4) is fixedly connected to the integrated platform (3); a ball screw (7) is provided on the spiral sleeve of the support seat (4), and the top end of the ball screw (7) is fixedly connected to the integrated platform (3); the ball screw 7 is meshedly connected with a helical gear set (5), and the helical gear set (5) is transmission-connected with a rocker (6), and the rocker (6) drives the helical gear (5) to rotate and drive the ball screw (7) to move in the vertical direction; the height adjustment mechanism is used to drive the centrifugal nozzle to rise and fall synchronously in the vertical direction; The flow test platform mechanism includes a water pump (11), the water pump (11) is connected to a flow meter (12) through a medicine tube, and the water pump (11) and the flow meter (12) are fixed to one end of the integrated platform (3); the test platform mechanism also includes a display screen (13), the display screen is fixed to one end of the integrated platform (3) and is in electrical communication with the main control chip (8); the flow meter (12) is electrically connected to the intelligent control system; the test platform mechanism is used for real-time monitoring of the centrifugal nozzle speed, flow rate and droplet particle size spectrum; The power supply system is detachable to supply power to the test bench; The test bench enables different types of centrifugal nozzles to be adapted to the Malvern particle size analyzer.

2. The centrifugal nozzle performance test bench capable of rapid assembly and disassembly according to claim 1, characterized in that: The distance between the claws of the movable chuck (1) is adjusted by a screw. The inner diameter of the chuck (1) is 65 mm, and is suitable for centrifugal nozzles with a diameter of 10-60 mm.

3. The centrifugal nozzle performance test bench capable of rapid assembly and disassembly according to claim 1, characterized in that: The main control chip (8) is STM32C8T6, which outputs a 50Hz PWM signal with a duty cycle of 10%-20% and an effective level of 10ms-20ms.

4. The centrifugal nozzle performance test bench capable of rapid assembly and disassembly according to claim 1, characterized in that: The rotary encoder (9) is an EC11 rotary encoder.

5. The centrifugal nozzle performance test bench capable of rapid assembly and disassembly according to claim 1 is characterized in that: The brushless ESC (10) is a Hobbywing 40A brushless ESC, which supports 50Hz PWM signal input and has a rotation speed fluctuation rate of <±1%.

6. The centrifugal nozzle performance test bench capable of rapid assembly and disassembly according to claim 1, characterized in that: The ball screw (7) has a stroke of 20 mm and is made of 304 stainless steel with a bearing capacity of ≥50 kg; the single helical gear (5) has a diameter of 40 mm and a transmission ratio of 1:

1.

7. The centrifugal nozzle performance test bench capable of rapid assembly and disassembly according to claim 1, characterized in that: The support seat (4) has a height adjustment range of 55-75 mm and an anodized surface.

8. The centrifugal nozzle performance test bench capable of rapid assembly and disassembly according to claim 1, characterized in that: The flow meter (12) has an accuracy of ±1% and a measuring range of 0.5-12 L / min.

9. The centrifugal nozzle performance test bench capable of rapid assembly and disassembly according to claim 1, characterized in that: The display screen (13) has a resolution of 128×64 pixels and displays the rotation speed in real time; and supports MODBUS protocol data export.

10. The centrifugal nozzle performance test bench capable of rapid assembly and disassembly according to claim 1, characterized in that: The power supply system includes a 6S lithium battery (14) for supplying power to the centrifugal nozzle; and a 5V lithium battery (15) for supplying power to the main control chip (8).

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