Ultrasonic removal method and system for movable dirt on PCBA surface

Abstract

The present invention relates to the technical field of PCBA cleaning processes and discloses a method and system for ultrasonically removing movable dirt from a PCBA surface. A cleaning liquid is determined according to the type of dirt on the PCBA surface; based on the type of cleaning liquid and the degree of dirt on the PCBA surface, a cleaning time and cleaning power of an ultrasonic cleaning device are set; and a cleanliness characterization value of the PCBA under the cleaning time and cleaning power is obtained. Based on the cleanliness characterization value of the PCBA in historical data, negative feedback is provided to the cleaning time and cleaning power of the ultrasonic cleaning device to dynamically correct the cleaning time and cleaning power of the ultrasonic cleaning device. The present invention dynamically identifies the concentration of ion residues, non-volatile residues, and insulation resistance of the PCBA after cleaning, providing strong support for quality control and process improvement in subsequent PCBA processing, thereby improving the cleaning effect of dirt on the PCBA surface.

Description

Technical Field

[0001] The present invention relates to the technical field of PCBA cleaning processes, and in particular to a method and system for ultrasonically removing movable dirt from the surface of a PCBA. Background Art

[0002] The principle of an ultrasonic cleaning machine is to convert the acoustic energy of a high-power ultrasonic source into mechanical vibrations through a transducer. This energy is then radiated through the walls of the cleaning tank into the cleaning fluid within. This ultrasonic radiation causes microbubbles in the liquid within the tank to vibrate under the influence of the sound waves. This disrupts the adsorption of dirt onto the surface of the cleaning component, causing fatigue damage and removal of the dirt layer. The vibration of the gas bubbles scrubs the solid surface, thereby reducing the presence of removable dirt on the PCBA.

[0003] In the existing PCBA cleaning process, there is a lack of a practical range for determining the cleaning time and cleaning power of the ultrasonic cleaning machine to achieve the best PCBA removal effect, which has significant limitations.

[0004] Based on this, the present application proposes a method and system for ultrasonically removing movable dirt from the surface of a PCBA. Summary of the Invention

[0005] The present invention aims to provide a method and system for ultrasonically removing removable contaminants from PCBA surfaces. During the cleaning process, the system dynamically identifies the concentration of ionic residues, non-volatile residues, and insulation resistance of the cleaned PCBA. The system then identifies the degree of cleaning of the PCBA based on the obtained concentrations of ionic residues, non-volatile residues, and insulation resistance, providing strong support for quality control and process improvements during subsequent PCBA processing.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] The ultrasonic removal method for removable dirt on the PCBA surface includes the following steps:

[0008] Identify the dirt on the PCBA surface, determine the type of dirt on the PCBA surface, and determine the cleaning fluid based on the type of dirt on the PCBA surface;

[0009] The cleaning time and power of the ultrasonic cleaning equipment are set based on the type of cleaning fluid and the degree of dirtiness on the PCBA surface.

[0010] And obtain the cleanliness characterization value of the PCBA under the cleaning time and cleaning power;

[0011] Based on the PCBA cleanliness characterization value in historical data, negative feedback is provided to the cleaning time and cleaning power of the ultrasonic cleaning equipment, completing dynamic correction of the cleaning time and cleaning power of the ultrasonic cleaning equipment;

[0012] After cleaning is completed, the PCBA is removed from the tank of the ultrasonic cleaning machine and rinsed and dried to complete the cleaning of the removable dirt on the PCBA surface.

[0013] As a further solution of the present invention, the process of obtaining the cleanliness characterization value of the PCBA is as follows:

[0014] The fractional value S of the ion residue concentration after PCBA cleaning ICC , non-volatile residue mass fraction value S NVR and insulation resistance evaluation score S IR To obtain;

[0015] The fractional value S of the ion residue concentration of the cleaned PCBA ICC The weight ratio is recorded as w ICC , non-volatile residue mass fraction value S NVR The weight ratio is recorded as w NVR , insulation resistance evaluation score S IR The weight ratio is recorded as w IR ;

[0016] By the formula S=S ICC *w ICC +S NVR *w NVR +S IR *w IR The cleanliness value S of the PCBA after cleaning is calculated.

[0017] Beneficial effects of the present invention:

[0018] (1) The present invention first identifies dirt on the PCBA surface, determines a cleaning liquid according to the type of dirt on the PCBA surface, and then sets the cleaning time and cleaning power of the ultrasonic cleaning equipment based on the type of cleaning liquid and the degree of dirt on the PCBA surface. The cleaning time and cleaning power of the ultrasonic cleaning equipment are negatively fed back according to the cleanliness characterization value of the PCBA in historical data. By selecting the cleaning power verification interval and the cleaning time verification interval obtained when the cleanliness characterization value of the PCBA is qualified, the cleaning time and cleaning power of the ultrasonic cleaning equipment during the PCBA cleaning process are dynamically corrected based on the cleaning power verification interval and the cleaning time verification interval, thereby improving the cleaning effect of dirt on the PCBA surface.

[0019] (2) During the cleaning process of the PCBA, the present invention dynamically identifies the ion residue concentration, non-volatile residue and insulation resistance after the PCBA is cleaned, and identifies the cleaning degree of the PCBA based on the obtained ion residue concentration, non-volatile residue and insulation resistance, thereby providing strong support for quality control and process improvement in the subsequent PCBA processing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a flow chart of a method for ultrasonically removing movable dirt from a PCBA surface according to an embodiment of the present invention;

[0022] Figure 2 This is a flowchart of an ultrasonic cleaning system for removing movable dirt from a PCBA surface according to an embodiment of the present invention;

[0023] Figure 3 It is a structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] See also Figure 1 As shown, the present invention is a method for ultrasonically removing movable dirt on the surface of a PCBA, comprising the following steps:

[0026] Identify the dirt on the PCBA surface, determine the type of dirt on the PCBA surface, and determine the cleaning fluid based on the type of dirt on the PCBA surface;

[0027] The cleaning time and power of the ultrasonic cleaning equipment are set based on the type of cleaning fluid and the degree of dirtiness on the PCBA surface.

[0028] And obtain the cleanliness characterization value of the PCBA under the cleaning time and cleaning power;

[0029] Based on the PCBA cleanliness characterization value in historical data, negative feedback is provided to the cleaning time and cleaning power of the ultrasonic cleaning equipment, completing dynamic correction of the cleaning time and cleaning power of the ultrasonic cleaning equipment;

[0030] After cleaning is completed, the PCBA is removed from the tank of the ultrasonic cleaning machine and rinsed and dried to complete the cleaning of the removable dirt on the PCBA surface.

[0031] The cleaning fluid includes but is not limited to organic flux cleaning agents, water-based flux cleaning agents, solder paste cleaning agents, and general cleaning agents;

[0032] The selection of cleaning agents should be based on comprehensive considerations of factors such as the material of the PCBA, the type of contaminants, and the cleaning process to avoid corrosion or other damage to the PCBA.

[0033] During the cleaning process, when the PCBA is placed in the tank of the ultrasonic cleaning machine, it is necessary to ensure that the PCBA is completely immersed in the cleaning solution.

[0034] The process of obtaining the cleanliness characterization value of PCBA is as follows:

[0035] Measure the resistivity of the extract according to IPC-TM-650 standard;

[0036] That is, through the formula Calculate the ionic residue concentration ICC of PCBA measured , where V is the volume of the extract and ρ is the resistivity;

[0037] k is a constant that depends on the composition of the extract and the measurement conditions. In practical applications, the value of k is usually determined by a standard curve or calibration experiment;

[0038] Set the PCBA ion residue concentration threshold to PCBA ion residue concentration ICC threshold , a linear function was used to score the ionic residue concentration;

[0039] That is, through the formula Calculate the residual ion concentration fraction S ICC ;

[0040] Treat the non-volatile substances remaining on the PCBA after cleaning by heating the PCBA sample and determining the mass fraction of the non-volatile residue by measuring the mass damage;

[0041] That is, through the formula Calculate the mass fraction of non-volatile residue S NVR , where M initial is the total initial mass of the sample, M measured is the total mass of the sample after heating.

[0042] Identify the insulation resistance status of the PCBA after cleaning and obtain the insulation resistance evaluation score of the PCBA;

[0043] Measure the insulation resistance of the cleaned PCBA to obtain the insulation resistance value R measured ;

[0044] The threshold of the insulation resistance of the preset PCBA is R threhold-low and R threhold-high ;

[0045] Among them, R threhold-low Indicates the minimum value of insulation resistance; R threhold-high It indicates the maximum value of insulation resistance;

[0046] That is, through the formula Calculate the insulation resistance evaluation score S IR .

[0047] The fractional value S of the ion residue concentration of the cleaned PCBA ICC The weight ratio is recorded as w ICC , non-volatile residue mass fraction value S NVR The weight ratio is recorded as w NVR , insulation resistance evaluation score S IR The weight ratio is recorded as w IR ;

[0048] By the formula S=S ICC *w ICC +S NVR *w NVR +S IR *w IR The calculated cleanliness value S of the PCBA after cleaning;

[0049] in;

[0050] In practical applications, the weight w ICC 、w NVR and w IR The determination needs to be made based on the specific PCBA type, cleaning process requirements and industry standards;

[0051] In this embodiment, ICC The value of w is 0.33, NVR The value of w is 0.34, IR The value of is 0.33.

[0052] Thus, the cleanliness characterization value of each PCBA after cleaning is obtained, and then the cleaning time and cleaning power of the PCBA during the cleaning process are traced according to the cleanliness characterization value of the PCBA;

[0053] The PCBA cleanliness characterization value after cleaning and the corresponding cleaning time and cleaning power are recorded as S(St, Sg), where St is the cleaning time corresponding to the PCBA cleanliness characterization value, and Sg is the cleaning power corresponding to the PCBA cleanliness characterization value;

[0054] Traverse the cleaning data of PCBA cleaning and compare the historical cleaning PCBA cleanliness characterization value with the preset PCBA cleanliness characterization threshold;

[0055] The PCBAs whose cleanliness characterization value is less than the PCBA cleanliness characterization range threshold are recorded as qualified PCBAs. The set corresponding to the qualified PCBAs is obtained and recorded as Si(St, Sg), where i is the number of PCBAs that have passed cleaning and i is a positive integer.

[0056] PCBAs with a cleanliness characterization value greater than or equal to the PCBA cleanliness characterization range threshold are recorded as unqualified PCBAs after cleaning.

[0057] Obtain a set Si(St, Sg) of PCBAs that have passed cleaning, and establish a plane coordinate system based on the set of PCBAs that have passed cleaning;

[0058] That is, the first coordinate system is established with the cleaning time of the PCBA as the Y-axis and the PCBA cleanliness representation value of the PCBA as the X-axis;

[0059] That is, the second coordinate system is established with the cleaning power of the PCBA as the Y-axis and the PCBA cleanliness representation value of the PCBA as the X-axis;

[0060] In the first coordinate system, points are plotted in ascending order of PCBA cleanliness characterization values, and all the points plotted by the PCBA cleanliness characterization values ​​are sequentially connected with a smooth curve to obtain a first cleanliness characterization value curve of the PCBA cleanliness characterization value;

[0061] Then, the cleaning time corresponding to each PCBA cleanliness characterization value on the first cleanliness characterization value curve is plotted, and all the points plotted by the cleaning time are sequentially connected with a smooth curve to obtain a cleaning time curve;

[0062] Obtain the time interval corresponding to the cleaning time curve, and record it as the first time interval;

[0063] The first time interval is overlapped with the rated cleaning time interval, and an overlapping area between the first time interval and the rated cleaning time interval is selected and recorded as the standard cleaning time interval.

[0064] In the second coordinate system, the PCBA cleanliness characterization values ​​are plotted in ascending order, and all the points plotted by the PCBA cleanliness characterization values ​​are connected in sequence with a smooth curve to obtain a second cleanliness characterization value curve of the PCBA cleanliness characterization value;

[0065] Then, plot the cleaning power corresponding to each PCBA cleanliness characterization value on the second cleanliness characterization value curve, and connect all the points plotted by the cleaning power in sequence with a smooth curve to obtain a cleaning power curve;

[0066] Obtain the time interval corresponding to the cleaning power curve, and record it as the first power interval;

[0067] Overlapping the first power interval with the rated cleaning power interval, selecting the overlapping area between the first power interval and the rated cleaning power interval as the standard cleaning power interval;

[0068] Obtain the cleaning power corresponding to each cleaning time within the standard cleaning time interval to obtain the cleaning power verification interval, overlap the cleaning power verification interval with the cleaning power standard interval to obtain the cleaning power adjustment interval;

[0069] Obtain the cleaning time corresponding to each cleaning power within the cleaning power standard interval to obtain the cleaning time verification interval, overlap the cleaning time verification interval with the cleaning time standard interval to obtain the cleaning time adjustment interval;

[0070] The obtained cleaning power adjustment interval and cleaning time adjustment interval are mapped to each other.

[0071] That is, the cleaning time data corresponding to the cleaning power adjustment interval that does not conform to the cleaning time adjustment interval is eliminated, and the cleaning power interval corresponding to the remaining cleaning time is recorded as the cleaning power approval interval;

[0072] That is, the cleaning power data corresponding to the cleaning time adjustment interval that does not conform to the cleaning power adjustment interval is eliminated, and the cleaning time interval corresponding to the remaining cleaning power is recorded as the cleaning time approval interval;

[0073] During the cleaning process of the PCBA, the cleaning power verification interval and the cleaning time verification interval obtained are arbitrarily configured and processed, thereby completing the dynamic correction of the cleaning time and cleaning power of the ultrasonic cleaning equipment.

[0074] Example 2

[0075] See also Figure 2 As shown, the present invention is a system for ultrasonically removing dirt from a PCBA surface, comprising:

[0076] PCBA cleaning determination module, the PCBA cleaning determination module is used to identify dirt on the PCBA surface, determine the type of dirt on the PCBA surface, and determine the cleaning liquid according to the dirt type on the PCBA surface;

[0077] PCBA cleaning setting module: The PCBA cleaning setting module sets the cleaning time and cleaning power of the ultrasonic cleaning equipment based on the type of cleaning liquid and the degree of dirtiness on the PCBA surface;

[0078] PCBA cleaning correction module, the PCBA cleaning correction module is used to obtain the cleanliness characterization value of the PCBA under the cleaning time and cleaning power;

[0079] Based on the PCBA cleanliness characterization value in historical data, negative feedback is provided to the cleaning time and cleaning power of the ultrasonic cleaning equipment, completing dynamic correction of the cleaning time and cleaning power of the ultrasonic cleaning equipment;

[0080] The PCBA cleaning end module is used to remove the PCBA from the tank of the ultrasonic cleaning machine after cleaning, and perform rinsing and drying to complete the cleaning of movable dirt on the PCBA surface.

[0081] Example 3

[0082] Reference Figure 3 An embodiment of the present invention further provides a computer device 3, comprising: a memory 302, a processor 301, and a computer program 303 stored in the memory 302. When the computer program 303 is executed on the processor 301, the ultrasonic removal method for movable dirt on the PCBA surface as described in any one of the above methods is implemented.

[0083] The computer device 3 may be a desktop computer, a notebook computer, a PDA, a cloud server or other computing devices. The computer device 3 may include, but is not limited to, a processor 301 and a memory 302. Those skilled in the art will understand that

[0084] Figure 3 This is merely an example of the computer device 3 and does not constitute a limitation on the computer device 3 . The computer device 3 may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the computer device 3 may also include input and output devices, network access devices, etc.

[0085] The processor 301 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. A general-purpose processor may be a microprocessor or any conventional processor.

[0086] In some embodiments, the memory 302 may be an internal storage unit of the computer device 3, such as a hard disk or memory of the computer device 3. In other embodiments, the memory 302 may also be an external storage device of the computer device 3, such as a plug-in hard disk, a SmartMediaCard (SMC), a Secure Digital (SD) card, a Flash Card, etc. equipped on the computer device 3. Furthermore, the memory 302 may include both an internal storage unit of the computer device 3 and an external storage device. The memory 302 is used to store an operating system, application programs, a boot loader, data, and other programs, such as the program code of the computer program. The memory 302 may also be used to temporarily store data that has been output or is about to be output.

[0087] Example 4

[0088] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for ultrasonically removing movable dirt from the surface of a PCBA as described in any one of the above methods is implemented.

[0089] In this embodiment, if the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process of the above-mentioned method embodiment by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, it can implement the steps of each of the above-mentioned method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file, or some intermediate form. The computer-readable medium can at least include: any entity or device capable of carrying computer program code to the camera / terminal device, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal, and software distribution medium. For example, a USB flash drive, mobile hard drive, magnetic disk, or optical disk. In some jurisdictions, based on legislation and patent practice, computer-readable media cannot be electric carrier signals or telecommunication signals.

[0090] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0091] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. The ultrasonic removal method for movable dirt on PCBA surface is characterized by: The following steps are involved: Identify the dirt on the PCBA surface, determine the type of dirt on the PCBA surface, and determine the cleaning fluid based on the type of dirt on the PCBA surface; The cleaning time and power of the ultrasonic cleaning equipment are set based on the type of cleaning fluid and the degree of dirtiness on the PCBA surface. And obtain the cleanliness characterization value of the PCBA under the cleaning time and cleaning power; Based on the PCBA cleanliness characterization value in historical data, negative feedback is provided to the cleaning time and cleaning power of the ultrasonic cleaning equipment, completing dynamic correction of the cleaning time and cleaning power of the ultrasonic cleaning equipment; After cleaning, remove the PCBA from the ultrasonic cleaning tank, rinse and dry it, and the removable dirt on the PCBA surface is cleaned. The process of obtaining the cleanliness characterization value of PCBA is as follows: The fractional value S of the ion residue concentration after PCBA cleaning ICC , non-volatile residue mass fraction value S NVR and insulation resistance evaluation score S IR To obtain; The fractional value S of the ion residue concentration of the cleaned PCBA ICC The weight ratio is recorded as w ICC , non-volatile residue mass fraction value S NVR The weight ratio is recorded as w NVR , insulation resistance evaluation score S IR The weight ratio is recorded as w IR ; By formula The calculated cleanliness value S of the PCBA after cleaning; Ion residue concentration fraction S ICC The acquisition process is: Based on IPC-TM-650 standard; Calculate the ionic residue concentration ICC of PCBA measured , where V is the volume of the extract, ρ is the resistivity, and k is a constant; Setting the ICC threshold for PCBA ionic residue concentration threshold ; The residual ion concentration fraction S is obtained by calculation ICC ; Non-volatile residue mass fraction S NVR The acquisition process is: The PCBA sample is heated and the mass fraction of non-volatile residue is determined by measuring the mass damage; By calculating the mass fraction of non-volatile residue S NVR ; Insulation resistance evaluation score S IR The acquisition process is: Measure the insulation resistance of the cleaned PCBA to obtain the insulation resistance value R measured ; The threshold of the insulation resistance of the preset PCBA is R threhold-low and R threhold-high ; Among them, R threhold-low Indicates the minimum value of insulation resistance; R threhold-high It indicates the maximum value of insulation resistance; That is, the insulation resistance evaluation score S is obtained by calculation IR .

2. The ultrasonic removal method for movable dirt on the PCBA surface according to claim 1 is characterized in that: Traverse the cleaning data of PCBA cleaning and compare the historical cleaning PCBA cleanliness characterization value with the preset PCBA cleanliness characterization threshold; The PCBAs whose cleanliness characterization values ​​are less than the PCBA cleanliness characterization range threshold are recorded as qualified PCBAs. The set corresponding to the qualified PCBAs is obtained and recorded as Si (St, Sg), where i is the number of qualified PCBAs. St is the cleaning time corresponding to the PCBA cleanliness characterization value, and Sg is the cleaning power corresponding to the PCBA cleanliness characterization value.

3. The ultrasonic removal method for movable dirt on the PCBA surface according to claim 1 is characterized in that: Establish a plane coordinate system based on the collection of cleaned qualified PCBAs; That is, the first coordinate system is established with the cleaning time of the PCBA as the Y-axis and the PCBA cleanliness representation value of the PCBA as the X-axis; That is, the second coordinate system is established with the cleaning power of the PCBA as the Y-axis and the PCBA cleanliness representation value of the PCBA as the X-axis; In the first coordinate system, the PCBA cleanliness characterization values ​​are arranged in ascending order to construct a first cleanliness characterization value curve; In the second coordinate system, the PCBA cleanliness characterization values ​​are arranged in ascending order to construct a second cleanliness characterization value curve.

4. The ultrasonic removal method for movable dirt on the PCBA surface according to claim 3 is characterized in that: The cleaning time curve is constructed by plotting the cleaning time corresponding to each PCBA cleanliness characterization value on the first cleanliness characterization value curve; Obtain the time interval corresponding to the cleaning time curve, and record it as the first time interval; Overlapping the first time interval with the rated cleaning time interval to obtain a standard cleaning time interval; Obtain the cleaning power corresponding to each cleaning time within the standard cleaning time interval to obtain the cleaning power verification interval, overlap the cleaning power verification interval with the cleaning power standard interval to obtain the cleaning power adjustment interval; The cleaning power corresponding to each PCBA cleanliness characterization value on the second cleanliness characterization value curve is plotted to construct a power curve; Obtain the time interval corresponding to the cleaning power curve, and record it as the first power interval; Overlapping the first power interval with the rated cleaning power interval to obtain a standard cleaning power interval; The cleaning time corresponding to each cleaning power within the cleaning power standard interval is obtained to obtain a cleaning time verification interval, and the cleaning time verification interval is overlapped with the cleaning time standard interval to obtain a cleaning time adjustment interval.

5. The ultrasonic removal method for movable dirt on the PCBA surface according to claim 4 is characterized in that: The obtained cleaning power adjustment interval and cleaning time adjustment interval are mapped to each other. That is, the cleaning time data corresponding to the cleaning power adjustment interval that does not conform to the cleaning time adjustment interval is eliminated, and the cleaning power interval corresponding to the remaining cleaning time is recorded as the cleaning power approval interval; That is, the cleaning power data corresponding to the cleaning time adjustment interval that does not conform to the cleaning power adjustment interval is eliminated, and the cleaning time interval corresponding to the remaining cleaning power is recorded as the cleaning time approval interval; During the cleaning process of the PCBA, the cleaning power verification interval and the cleaning time verification interval obtained are arbitrarily configured, thereby completing the dynamic correction of the cleaning time and cleaning power of the ultrasonic cleaning equipment.

6. The ultrasonic removal system for movable dirt on PCBA surface is characterized by: The system is used to perform the ultrasonic removal method according to any one of claims 1 to 5, comprising: PCBA cleaning determination module, the PCBA cleaning determination module is used to identify dirt on the PCBA surface, determine the type of dirt on the PCBA surface, and determine the cleaning liquid according to the dirt type on the PCBA surface; PCBA cleaning setting module: The PCBA cleaning setting module sets the cleaning time and cleaning power of the ultrasonic cleaning equipment based on the type of cleaning liquid and the degree of dirtiness on the PCBA surface; PCBA cleaning correction module, the PCBA cleaning correction module is used to obtain the cleanliness characterization value of the PCBA under the cleaning time and cleaning power; Based on the PCBA cleanliness characterization value in historical data, negative feedback is provided to the cleaning time and cleaning power of the ultrasonic cleaning equipment, completing dynamic correction of the cleaning time and cleaning power of the ultrasonic cleaning equipment; The PCBA cleaning end module is used to remove the PCBA from the tank of the ultrasonic cleaning machine after cleaning, and perform rinsing and drying to complete the cleaning of movable dirt on the PCBA surface.

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