Ultrasonic cleaning machine capable of intelligently controlling gas content of cleaning liquid in layered manner and cleaning method

Abstract

The invention relates to an ultrasonic cleaning machine capable of intelligently controlling the gas content of cleaning fluid in a layered mode and a cleaning method.The ultrasonic cleaning machine comprises a cleaning tank and an ultrasonic transducer arranged on the left side of the cleaning tank and further comprises a degassing water tank and a tap water tank, and one or more vertical sound transmission films are arranged in the cleaning tank; the cleaning tank is divided into a plurality of cleaning areas arranged left and right, and each cleaning area is provided with a water inlet pipe connected with the degassing water tank, a water inlet pipe connected with the tap water tank and a water outlet pipe. According to the ultrasonic cleaning method, the ultrasonic cleaning machine is adopted, water with different gas contents is injected into all the cleaning areas, the cavitation threshold value of cleaning liquid is changed, and cavitation energy in the cleaning tank is evenly distributed. According to the ultrasonic cleaning device, the cleaning fluid can form a cavitation threshold gradient from high to low in the ultrasonic propagation direction, the uniformity of overall cavitation energy in the cleaning fluid is improved, the cleaning area range is effectively expanded, and the cleaning efficiency and effect are improved.

Description

Technical Field

[0001] The invention relates to an ultrasonic cleaning machine and a cleaning method for intelligently controlling the gas content of a cleaning liquid by stratification, and belongs to the technical field of ultrasonic cleaning. Background Art

[0002] The production process of automotive core components and automotive related accessories is complex, and requires fine cleaning in many key processes; in addition, vehicle parts are easily affected by various pollutants during driving, and also need regular cleaning and maintenance to reduce failure rates and extend vehicle service life. Due to the complex structure, diverse materials, and high cleanliness requirements of automotive parts, the requirements for cleaning technology are relatively high. Ultrasonic cleaning technology has gradually become the mainstream cleaning technology in automobile manufacturing and maintenance due to its unique advantages such as green environmental protection, high efficiency and no damage, and easy automation (especially for cleaning deep holes, blind holes, concave and convex grooves, etc.).

[0003] Ultrasonic waves are mechanical waves with a frequency higher than 20 kHz. They radiate forward in a sparse and dense manner in the liquid, causing a series of dynamic behaviors such as growth, collapse and collapse of tiny bubbles in the liquid. Among them, extreme physical phenomena such as microjets and shock waves generated when bubbles collapse rapidly near the wall surface cause them to produce a high-frequency vibration scrubbing effect on the surface of the workpiece; in addition, the local high temperature and high pressure generated at the moment of bubble collapse weaken the forces between insoluble dirt molecules, peel off the adhesion of dirt to the surface of the workpiece, and thus remove dirt from the surface of the workpiece. In the liquid sound field of ultrasonic cavitation, the series of physical processes such as high temperature, high pressure, microjets, and shock waves generated by moving bubbles are collectively referred to as cavitation effects, which play a decisive role in the ultrasonic cleaning mechanism. However, ultrasonic cleaning technology has cavitation shielding in the ultrasonic near-field area. There are three main reasons for cavitation shielding. First, the sound pressure in the ultrasonic near field is high, which leads to more cavitation bubbles in the area. The cavitation bubbles need to absorb more sound wave energy to make strong nonlinear radial pulsation. Second, the cavitation bubbles in the ultrasonic near field radiate high-order harmonics to the surrounding cleaning liquid through nonlinear pulsation. The attenuation coefficient of sound waves in the cleaning liquid is closely related to the sound wave frequency. The higher the frequency, the stronger the attenuation of sound waves by the liquid. Third, in addition to absorbing sound wave energy, cavitation bubbles will also reflect and scatter sound waves, hindering the forward propagation of ultrasound. The energy at a certain point in the liquid includes the energy of the ultrasound itself and the energy radiated by the cavitation bubble oscillation, which is defined as ultrasonic cavitation energy (referred to as cavitation energy). Cavitation shielding will cause the cavitation energy to be mainly concentrated in the near field area near the ultrasonic transducer, while the sound pressure amplitude in the ultrasonic far field area is lower (meaning that the cavitation energy is lower). When the input ultrasonic power is low, increasing the input power can expand the area where cavitation occurs to a certain extent. However, due to the shielding effect of cavitation bubbles on sound propagation, the greater the input sound power, the more cavitation bubbles are generated near the ultrasonic transducer, and the stronger the shielding effect of these cavitation bubbles on sound propagation. When the input sound power reaches a certain level, the cavitation bubbles near the transducer will almost completely prevent the sound waves from continuing to propagate forward. At this time, cavitation only occurs near the transducer, which means that large-scale ultrasonic cavitation cannot be achieved by continuously increasing the input ultrasonic power; and if the input ultrasonic power is reduced, the cavitation range will become smaller. This makes ultrasonic cleaning technology always have problems such as uneven cavitation energy distribution in the cleaning tank and localized cleaning range, resulting in a small number of cleaned parts, uneven cleaning, and low cleaning efficiency. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an ultrasonic cleaning machine and a cleaning method with stratified intelligent control of the gas content of the cleaning liquid, which can weaken the cavitation shielding phenomenon in the ultrasonic near-field area, expand the cavitation occurrence area, make the cavitation energy distribution uniform, and improve the cleaning efficiency and effect.

[0005] The technical solution of the present invention to achieve the above-mentioned purpose is: an ultrasonic cleaning machine with intelligent stratified control of the gas content of the cleaning liquid, including a cleaning tank and an ultrasonic transducer arranged on the left side of the cleaning tank, and also including a degassed water (or degassed water) tank and a tap water tank. One or more vertical (vertical) sound-permeable membranes are provided in the cleaning tank to divide the cleaning tank into a plurality of cleaning areas arranged on the left and right, and each of the cleaning areas is provided with a degassed water inlet pipe connected to the degassed water tank, and a tap water inlet pipe and an outlet pipe connected to the tap water tank.

[0006] Preferably, a plurality of sound pressure sensors (or hydrophones) are provided in the cleaning tank along the ultrasonic propagation direction from the ultrasonic near-field area to the ultrasonic far-field area. The plurality of sound pressure sensors are evenly distributed in the cleaning tank along the ultrasonic propagation direction. Under normal circumstances, at least one sound pressure sensor is provided in any cleaning area. The signal outputs of the plurality of sound pressure sensors are connected to a data acquisition card, the sound pressure signal outputs of the data acquisition card are connected to a main control computer, and the control signal outputs of the main control computer are respectively connected to the control ends of the control valves.

[0007] Preferably, each of the cleaning areas is provided with a dissolved oxygen sensor (or dissolved oxygen detection probe), the signal output of each dissolved oxygen sensor is connected to the data acquisition card, and the oxygen content signal output of the data acquisition card is connected to the main control computer.

[0008] Preferably, the acoustic pressure sensor and the dissolved oxygen sensor are both arranged in a linear distribution along the ultrasonic wave propagation direction in the cleaning tank.

[0009] Preferably, the ultrasonic transducer is installed in the central part (central part of the underwater part) of the left side wall of the cleaning tank (that is, the left side wall of the leftmost cleaning area), and the sound pressure sensor and the dissolved oxygen sensor are distributed in the cleaning tank along the horizontal center line of the cleaning tank.

[0010] Preferably, each water pipe (including the deaerated water inlet pipe, the tap water inlet pipe and the outlet pipe) is provided with its own control valve.

[0011] Preferably, the control valve is a solenoid valve.

[0012] Preferably, each water pipe is provided with its own water pump.

[0013] The control valves and water pumps can be arranged according to the existing technology so that each water pipe can be independently controlled.

[0014] Preferably, the sound-permeable membrane at least covers the middle area of ​​the cross section of the cleaning tank where it is located. No gap is left between the sound-permeable membrane and the bottom surface and the front and rear side walls of the cleaning tank.

[0015] Preferably, the water outlet end of the water outlet pipe of each cleaning area is connected to the water outlet collection container.

[0016] An ultrasonic cleaning method for intelligently controlling the gas content of a cleaning liquid by stratification adopts any one of the ultrasonic cleaning machines for intelligently controlling the gas content of a cleaning liquid disclosed in the present invention, and injects water (degassed water, tap water, or mixed water of the two in different proportions) with different gas contents (oxygen contents) into each of the cleaning zones, so that the gas content of the cleaning liquid in the cleaning zone on the right side (which may be referred to as the right cleaning zone) of the two adjacent cleaning zones is higher than the gas content of the cleaning liquid in the cleaning zone on the left side (which may be referred to as the left cleaning zone), thereby increasing the cavitation threshold of the cleaning liquid in the ultrasonic near-field area, weakening the cavitation shielding phenomenon, and at the same time reducing the cavitation threshold of the cleaning liquid in the ultrasonic far-field area, expanding the cavitation occurrence area, and evenly distributing the cavitation energy in the cleaning tank.

[0017] Preferably, the cavitation energy uniformity index in the cleaning liquid is calculated based on multiple sound pressure signals collected in the ultrasonic propagation direction from the ultrasonic near-field region to the ultrasonic far-field region, and based on the gas content of the cleaning liquid and the cavitation energy uniformity index, a neural network algorithm is used to predict in real time the gas content and the cavitation energy uniformity index of the cleaning liquid in the next preset time period. If the predicted cavitation energy uniformity index of the cleaning liquid in the next preset time period exceeds the range of the preset cavitation energy uniformity threshold, water with different gas contents is injected into the relevant different cleaning areas, and the gas content of the cleaning liquid in the different cleaning areas is adjusted until the cavitation energy uniformity index of the cleaning liquid is within the range of the preset cavitation energy uniformity threshold; if the predicted cavitation energy uniformity index of the cleaning liquid in the next preset time period is within the range of the preset cavitation energy uniformity threshold, no adjustment is made.

[0018] Preferably, the gas content and cavitation energy uniformity index of the cleaning liquid in a plurality of consecutive preset time periods before the prediction time point are continuously used to train the neural network in real time.

[0019] The beneficial effects of the present invention are as follows: the present invention injects water with different gas contents into each cleaning zone, so that the gas contents of the cleaning liquid in the left cleaning zone and the right cleaning zone in the adjacent cleaning zones are different, thereby forming a cavitation threshold gradient in the ultrasonic propagation direction from the ultrasonic near field zone to the ultrasonic far field zone in the cleaning tank (the cavitation threshold of the cleaning liquid in the left cleaning zone is high, and the cavitation threshold of the cleaning liquid in the right cleaning zone is low), preventing the cavitation from being too intense in the ultrasonic near field zone, weakening the cavitation shielding phenomenon in the ultrasonic near field zone, and expanding the cavitation occurrence range in the ultrasonic far field zone. The gas content of the cleaning liquid in a large area of ​​the cleaning tank can be controlled for a long time without human intervention, so that the cavitation energy in the cleaning tank tends to be evenly distributed, and the cleaning uniformity, cleaning efficiency and effect are improved. Since the surface of the cleaning liquid is exposed to the air and there is gas exchange with the air, the gas content of the cleaning liquid is constantly changing. The neural network algorithm is used to predict and control the water injection type and water injection amount of each cleaning zone, and the intelligent control of water injection is realized, so that the gas content (cavitation threshold) of the cleaning liquid is adjusted more in real time and accurately, and the uniformity of the cavitation energy distribution of the cleaning liquid is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment of an ultrasonic cleaning machine with intelligent stratified control of the gas content of the cleaning liquid of the present invention; Figure 2 It is a control system block diagram of the ultrasonic cleaning method for intelligently controlling the gas content of the cleaning liquid by stratification according to the present invention; Figure 3 is a structural diagram of the neural network algorithm of the present invention; Figure 4 The present invention is a flow chart of an ultrasonic cleaning method for intelligently controlling the gas content of a cleaning liquid by stratification. DETAILED DESCRIPTION

[0021] All directional indications (such as left, right, etc.) in the embodiments of the present invention are only used to explain the relative position relationship between the components under a certain specific posture (as shown in the accompanying drawings), and do not constitute a limitation on the actual use direction. If the specific posture changes, the directional indication will also change accordingly.

[0022] The following describes in detail the specific implementation of the present invention by taking the provision of a sound-transmitting membrane as an example.

[0023] See also Figure 1The present invention discloses an ultrasonic cleaning machine with intelligent control of the gas content of cleaning liquid by stratification, comprising a cleaning tank, an ultrasonic transducer 1 is arranged on the tank wall of the cleaning tank, and is used to radiate ultrasonic waves to the cleaning liquid in the cleaning tank, and also comprises a degassed water (or deaerated water) tank 2 and a tap water tank 3, which are used to contain degassed water and tap water respectively, and a sound-permeable membrane (or waterproof sound-permeable membrane, such as polyurethane membrane, polyester membrane or polyolefin membrane, etc.) 4 is vertically arranged in the cleaning tank, and the sound-permeable membrane is preferably arranged in the middle of the cleaning tank, The cleaning tank is divided into a left cleaning area 5 and a right cleaning area 6. The ultrasonic transducer is arranged on the left side wall of the left cleaning area. The left cleaning area and the right cleaning area are both provided with a deaerated water inlet pipe 7 connected to the deaerated water tank, a tap water inlet pipe 8 and an outlet pipe 9 connected to the tap water tank, which are respectively used for the deaerated water inlet, tap water inlet and outlet of the left cleaning area and the right cleaning area. Each water pipe is provided with a control valve and a water pump (not shown in the figure). The control valve is preferably a solenoid valve. By injecting water with different gas contents into the left cleaning area and the right cleaning area, the gas contents of the cleaning liquid in the left cleaning area and the right cleaning area are different, and finally the cleaning liquid in the cleaning tank forms a cavitation threshold gradient in the ultrasonic propagation direction from the ultrasonic near field area to the far field area.

[0024] A plurality of sound pressure sensors (or hydrophones) 10 are preferably provided in the cleaning tank along the ultrasonic wave propagation direction from the ultrasonic wave near field region to the ultrasonic wave far field region, for collecting sound pressure signals at different positions of the cleaning liquid in the cleaning tank, and the plurality of sound pressure sensors are evenly distributed in the cleaning tank along the ultrasonic wave propagation direction, wherein some of the sound pressure sensors are located in the left cleaning area (collecting sound pressure signals at corresponding positions in the left cleaning area), and the remaining sound pressure sensors are located in the right cleaning area (collecting sound pressure signals at corresponding positions in the right cleaning area), and the signal outputs of the plurality of sound pressure sensors are A data acquisition card (for example, Lingzhi Electronics DAQ122, Anyibo Electronics USB2DaqsA, Zishu Technology DAQ-USB4010, etc.) 11 is connected, and the sound pressure signal sampled by the data acquisition card (the analog signal is converted into a digital signal) is output and connected to the main control computer 12 for analysis and processing. The control signal output of the main control computer is respectively connected to the control end of each of the control valves and each of the water pumps to control the opening and closing and the opening degree of the corresponding control valve and the opening and closing of the corresponding water pump, thereby controlling the water injection type and water injection amount of the left cleaning area and the right cleaning area.

[0025] Preferably, a dissolved oxygen sensor (or dissolved oxygen detection probe) 13 is respectively provided in the left cleaning area and the right cleaning area, for collecting the oxygen content of the cleaning liquid in the left cleaning area and the right cleaning area. The signal outputs of the two dissolved oxygen sensors are connected to the data acquisition card, and the oxygen content signal output sampled by the data acquisition card is connected to the main control computer, and the sampled oxygen content signal is fed back to the main control computer in real time.

[0026] The acoustic pressure sensor and the dissolved oxygen sensor are arranged in a straight line along the ultrasonic wave propagation direction in the cleaning tank. The ultrasonic transducer is arranged at the center of the left wall of the left cleaning area, and is connected to the main control computer through an ultrasonic power supply 14. The acoustic pressure sensor and the dissolved oxygen sensor are arranged in a straight line along the horizontal center line of the cleaning tank. The outlet ends of the outlet pipes of the left cleaning area and the right cleaning area are connected to the water outlet collection container 15, which is used to collect the cleaning liquid with oily dirt discharged from the left cleaning area and the right cleaning area, and then filter and discharge it. The deaerated water inlet pipes of the left cleaning area and the right cleaning area are connected to the deaerated water main inlet pipe, and the deaerated water tank is connected through the deaerated water main inlet pipe. The deaerated water inlet pipes of the left cleaning area and the right cleaning area can be respectively provided with water pumps. Similarly, the tap water inlet pipes of the left washing area and the right washing area are commonly connected to the main tap water inlet pipe, which is connected to the tap water tank through the main tap water inlet pipe. Water pumps can be respectively provided on the tap water inlet pipes of the left washing area and the right washing area.

[0027] The present invention also discloses an ultrasonic cleaning method for intelligently controlling the gas content of a cleaning liquid by stratification. The ultrasonic cleaning machine for intelligently controlling the gas content of a cleaning liquid by stratification disclosed in any one of the present invention is used to inject water (degassed water, tap water, or mixed water of the two in different proportions) with different gas contents (oxygen contents) into the left cleaning area and the right cleaning area, thereby reducing the gas content of the cleaning liquid in the left cleaning area and increasing the gas content of the cleaning liquid in the right cleaning area. The purpose is, on the one hand, to increase the cavitation threshold of the cleaning liquid in the ultrasonic near-field area and weaken the cavitation shielding phenomenon; on the other hand, to reduce the cavitation threshold of the cleaning liquid in the far-field area, expand the cavitation occurrence area, and make the cavitation energy in the cleaning tank evenly distributed.

[0028] The plurality of sound pressure sensors correspond to the plurality of data (sound pressure signal) monitoring points in the cleaning tank. Taking the number of the sound pressure sensors as four as an example, four monitoring points are evenly set on the horizontal center line of the cleaning tank (when setting other numbers of monitoring points, the principle and calculation method are the same), and one sound pressure sensor is set at each monitoring point. The monitoring points from the left side to the right side of the cleaning tank are marked as , , , ,in , Located in the left cleaning area (ultrasonic near field area), , Located in the right cleaning area (ultrasonic far field area). The water injection control method of the left cleaning area and the right cleaning area is: the sound pressure time domain signal of the corresponding monitoring point detected by each sound pressure sensor is transmitted to the main control computer (first transmitted to the data acquisition card, and then transmitted from the data acquisition card to the main control computer), and the main control computer performs Fourier transform on it to convert it into a frequency domain signal, and then integrates it to obtain the cavitation energy value at each monitoring point, which is recorded as , , , The average cavitation energy in the left cleaning area (ultrasonic near field area) is defined as , the average cavitation energy in the right cleaning area (ultrasonic far field area) is The average value of the overall cavitation energy in the cleaning tank is , then the cavitation energy variance in the left cleaning zone and the right cleaning zone is , the variance As an indicator of the uniformity of the overall cavitation energy in the cleaning tank. When the value is greater than a certain threshold (the preset cavitation energy uniformity threshold), it is considered that the overall cavitation energy distribution in the cleaning tank is uneven. At this time, the cavitation energy uniformity definition formula is used: , to calculate the uniformity of the overall cavitation energy. and , using a neural network algorithm, the overall cavitation energy distribution in the cleaning liquid in the future period is predicted, and then the control valves and water pumps on the water pipes in the left cleaning area and the right cleaning area are automatically and intelligently controlled according to the prediction results, and the water injection type (degassed water and tap water) and water injection amount of the left cleaning area and the right cleaning area are adjusted, and then the gas content of the cleaning liquid in the left cleaning area and the right cleaning area is adjusted, the cavitation shielding phenomenon in the ultrasonic near field area is weakened, the cavitation occurrence area in the ultrasonic far field area is expanded, and the uniformity of the cavitation phenomenon in the cleaning liquid is ensured.

[0029] In actual application, the main control computer sends instructions to the ultrasonic power supply through the USB interface, and the ultrasonic power supply loads the AC voltage to the ultrasonic transducer according to the instructions. The ultrasonic transducer radiates ultrasonic waves into the cleaning liquid in the cleaning tank under the drive of the voltage. The cleaning tank is divided into two parts by the sound-permeable membrane: the left cleaning area (ultrasonic near-field area) and the right cleaning area (ultrasonic far-field area). The left cleaning area and the right cleaning area are not connected and contain cleaning liquids with different gas contents. Four sound pressure sensors (or hydrophones) and two dissolved oxygen sensors (or dissolved oxygen detection probes) are installed in the cleaning tank. Among them, two sound pressure sensors and one dissolved oxygen sensor are installed in each of the left cleaning area and the right cleaning area, which are used to monitor the cavitation energy distribution and oxygen content of the cleaning liquid in real time during the cleaning process. The data acquisition card converts the analog signal collected by the sound pressure sensor into a digital signal and sends it to the main control computer. The left cleaning area and the right cleaning area are connected to the deaerated water tank and the tap water tank through pipelines, and the opening or closing of the pipelines is controlled by electromagnetic valves arranged on the pipelines. The main control computer controls the opening and closing and the opening degree of the electromagnetic valves on each pipeline according to the output result of the automatic control algorithm (the electromagnetic valves on each pipeline can be controlled by a multi-valve controller or a distributed control system), thereby controlling the water injection type and water injection amount of the left cleaning area and the right cleaning area, so as to maintain the uniformity index of the cavitation energy of the cleaning liquid within a certain range.

[0030] Considering that the cleaning fluid cannot be replaced instantly and there is a certain delay in the change of the gas content of the cleaning fluid, the algorithm will predict the gas content and cavitation energy uniformity index of the cleaning fluid in the next period of time based on the previous gas content and cavitation uniformity index of the cleaning fluid. If the cavitation uniformity index in the next stage will exceed the preset range (the preset cavitation energy uniformity threshold), the corresponding solenoid valve will be controlled to inject water with different gas contents into the left cleaning area and the right cleaning area, and the gas content of the cleaning fluid in the left cleaning area and the right cleaning area will be adjusted, so that the overall cavitation energy distribution uniformity in the cleaning fluid will eventually reach the expected level.

[0031] See also Figure 2 , the specific control strategy is: Stage 1: Overall cavitation energy variance and cavitation energy distribution uniformity index Prediction During the ultrasonic cavitation treatment process, the dissolved oxygen sensor is used to monitor the gas content of the cleaning liquid in real time, and the sound pressure sensor is used to monitor the cavitation energy distribution of the cleaning liquid in real time. The duration of each time period (preset time period) is set to 10s. The average values ​​of the cavitation energy uniformity index and the oxygen content of the cleaning liquid within 10s are taken as the values ​​of the time period. In this way, a two-dimensional time series can be formed during the cavitation treatment. After the cavitation treatment for a period of time (for example, 3 minutes), the long short-term memory neural network is trained using the previously saved time series, and the input is five one-dimensional vectors (each vector has 8 values, namely, 2 measured values ​​of the dissolved oxygen sensors, cavitation energy calculated based on the signals collected by the 4 sound pressure sensors, and 1 cavitation energy variance and 1 indicator of the current cavitation uniformity ), the output is two data, corresponding to the cavitation energy variance and cavitation energy distribution uniformity index In this way, a model can be trained to predict the variance of the cleaning fluid cavitation energy at a future moment. and cavitation energy distribution uniformity index After training, this neural network is used to calculate the subsequent cavitation energy variance. and cavitation energy distribution uniformity index Make real-time predictions. Figure 2 middle, Y ( s ) contains the cavitation energy variance and cavitation energy distribution uniformity index , O ( s ) contains the measured values ​​of 2 dissolved oxygen sensors, C ( s ) contains the cavitation energy calculated from the signals collected by the four sound pressure sensors, R ( s ) is the target value, E ( s ) is the error value, U ( s ) is the adjustment signal, D ( s ) is the disturbance. During the cavitation process, the neural network continues to train in real time. The structure of the neural network is as follows Figure 3 shown.

[0032] Phase 2: Liquid Regulation According to the prediction results output in the first stage, if it is found that the cavitation energy uniformity index will exceed the preset range (the preset cavitation energy uniformity threshold) in the next time period, the gas content of the cleaning fluid will be regulated. Figure 4The specific control steps are as follows: If the cavitation degree in the left cleaning zone (ultrasonic near field zone) is strong and the cavitation degree in the right cleaning zone (ultrasonic far field zone) is weak, the cavitation threshold of the cleaning liquid in the left cleaning zone needs to be increased and the cavitation threshold of the cleaning liquid in the right cleaning zone needs to be decreased. At this time, the control valves on the outlet pipes of the left cleaning zone and the right cleaning zone are controlled by the main control computer to open, and a part of the cleaning liquid is pumped out by the water pump on the outlet pipe. Then, the control valve on the deaerated water inlet pipe of the left cleaning zone is controlled by the main control computer to open, and deaerated water is injected into the left cleaning zone by the water pump, and the control valve on the tap water inlet pipe of the right cleaning zone is controlled to open, and tap water is injected into the right cleaning zone by the water pump. During the water injection process, the gas content and the overall cavitation energy distribution of the cleaning liquid are still monitored in real time. If the predicted cavitation energy uniformity index of the next time period is within the preset range, the left cleaning zone and the right cleaning zone stop pumping and injecting water.

[0033] Unless otherwise specified or one preferred or optional technical means is a further limitation of another technical means, all preferred and optional technical means disclosed in the present invention can be arbitrarily combined to form several different technical solutions.

Claims

1. An ultrasonic cleaning machine with intelligent control of gas content in cleaning liquid, comprising a cleaning tank and an ultrasonic transducer arranged on the left side of the cleaning tank, characterized in that It also includes a degassed water tank and a tap water tank. One or more vertical sound-permeable membranes are provided in the cleaning tank to divide the cleaning tank into a plurality of cleaning areas arranged on the left and right. Each cleaning area is provided with a degassed water inlet pipe connected to the degassed water tank, and a tap water inlet pipe and outlet pipe connected to the tap water tank.

2. The ultrasonic cleaning machine with intelligent control of gas content in cleaning liquid according to claim 1, characterized in that A plurality of sound pressure sensors are arranged in the cleaning tank along the ultrasonic propagation direction from the ultrasonic near-field area to the ultrasonic far-field area. The plurality of sound pressure sensors are evenly distributed in the cleaning tank along the ultrasonic propagation direction. The signal outputs of the plurality of sound pressure sensors are connected to a data acquisition card. The sound pressure signal outputs of the data acquisition card are connected to a main control computer. The control signal outputs of the main control computer are respectively connected to the control ends of the control valves.

3. The ultrasonic cleaning machine with intelligent control of gas content in cleaning liquid according to claim 2, characterized in that A dissolved oxygen sensor is provided in each cleaning area, and the signal output of each dissolved oxygen sensor is connected to the data acquisition card, and the oxygen content signal output of the data acquisition card is connected to the main control computer.

4. The ultrasonic cleaning machine with intelligent control of gas content in cleaning liquid according to claim 3, characterized in that The acoustic pressure sensor and the dissolved oxygen sensor are both arranged in a straight line along the ultrasonic wave propagation direction in the cleaning tank.

5. The ultrasonic cleaning machine with intelligent control of gas content in cleaning liquid according to claim 4, characterized in that The ultrasonic transducer is installed at the center of the left side wall of the cleaning tank, and the sound pressure sensor and the dissolved oxygen sensor are distributed in the cleaning tank along the horizontal center line of the cleaning tank.

6. The ultrasonic cleaning machine with intelligent control of gas content in cleaning liquid according to claim 5, characterized in that Each water pipe is provided with its own control valve and / or its own water pump.

7. The ultrasonic cleaning machine with intelligent control of gas content in cleaning liquid according to claim 1, characterized in that The sound-transmitting membrane at least covers the middle area of ​​the cross section of the cleaning tank where it is located.

8. Ultrasonic cleaning method with intelligent control of gas content in cleaning liquid, characterized in that An ultrasonic cleaning machine with stratified intelligent control of the gas content of the cleaning liquid as described in any one of claims 1 to 7 is adopted, by injecting water with different gas contents into each of the cleaning areas, so that the gas content of the cleaning liquid in the cleaning area on the right of two adjacent cleaning areas is higher than the gas content of the cleaning liquid in the cleaning area on the left, thereby increasing the cavitation threshold of the cleaning liquid in the ultrasonic near-field area, weakening the cavitation shielding phenomenon, and at the same time reducing the cavitation threshold of the cleaning liquid in the ultrasonic far-field area, expanding the cavitation occurrence area, and making the cavitation energy in the cleaning tank evenly distributed.

9. The ultrasonic cleaning method with intelligent control of gas content in cleaning liquid according to claim 8, characterized in that The cavitation energy uniformity index in the cleaning liquid is calculated based on multiple sound pressure signals collected in the ultrasonic propagation direction from the ultrasonic near-field area to the ultrasonic far-field area. Based on the gas content of the cleaning liquid and the cavitation energy uniformity index, a neural network algorithm is used to predict the gas content and the cavitation energy uniformity index of the cleaning liquid in the next preset time period in real time. If the predicted cavitation energy uniformity index of the cleaning liquid in the next preset time period exceeds the range of the preset cavitation energy uniformity threshold, water with different gas contents is injected into different relevant cleaning areas, and the gas content of the cleaning liquid in the different cleaning areas is adjusted until the cavitation energy uniformity index of the cleaning liquid is within the range of the preset cavitation energy uniformity threshold; if the predicted cavitation energy uniformity index of the cleaning liquid in the next preset time period is within the range of the preset cavitation energy uniformity threshold, no adjustment is made.

10. The ultrasonic cleaning method with intelligent control of gas content in cleaning liquid according to claim 9, characterized in that The gas content and cavitation energy uniformity index of the cleaning fluid in a plurality of consecutive preset time periods before the prediction time point are continuously used to train the neural network in real time.

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