Method and system for ultrasonically removing movable dirt on surface of PCBA (Printed Circuit Board Assembly)

Abstract

The invention relates to the technical field of PCBA (Printed Circuit Board Assembly) cleaning processes, and discloses a method and a system for ultrasonically removing movable dirt on the surface of a PCBA, and the method comprises the following steps: determining a cleaning solution according to the dirt type on the surface of the PCBA; based on the type of the cleaning liquid and the smudginess degree of the PCBA surface, the cleaning time and the cleaning power of ultrasonic cleaning equipment are set; obtaining a cleanliness degree characterization value of the PCBA under the cleaning time and the cleaning power; negative feedback is carried out on the cleaning time and the cleaning power of the ultrasonic cleaning equipment on the basis of the cleanliness degree characterization value of the PCBA in historical data, and dynamic correction of the cleaning time and the cleaning power of the ultrasonic cleaning equipment is completed. Powerful support is provided for quality control and process improvement in the subsequent PCBA machining process, and the cleaning effect of dirt on the surface of the PCBA is improved.

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 ultrasonic cleaning machine is mainly to convert the sound energy of the power ultrasonic frequency source into mechanical vibration through the transducer, and radiate the ultrasonic wave to the cleaning liquid in the tank through the cleaning tank wall. Due to the radiation of ultrasonic waves, the microbubbles in the liquid in the tank can maintain vibration under the action of sound waves. The adsorption of dirt and the surface of the cleaning parts is destroyed, causing fatigue damage to the dirt layer and being removed. The vibration of gas bubbles scrubs the solid surface, thereby reducing the presence of movable dirt on PCBA.

[0003] In the existing PCBA cleaning process, there is a lack of a practical range for determining the cleaning time and cleaning power, which has great limitations in terms of how to set the cleaning time and cleaning power of the ultrasonic cleaning machine to achieve the best PCBA removable dirt effect.

[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 purpose of the present invention is to provide an ultrasonic removal method and system for movable dirt on the surface of a PCBA. During the cleaning process of the PCBA, the concentration of ionic residues, non-volatile residues and insulation resistance after the PCBA is cleaned are dynamically identified, and the cleaning degree of the PCBA is identified based on the obtained ionic residue concentration, non-volatile residue and insulation resistance, thereby providing strong support for quality control and process improvement in the subsequent PCBA processing process.

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

[0007] The ultrasonic removal method of movable dirt on the PCBA surface comprises the following steps:

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

[0009] The cleaning time and cleaning 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 cleanliness characterization value of PCBA in historical data, negative feedback is given to the cleaning time and cleaning power of the ultrasonic cleaning equipment to complete the dynamic correction of the cleaning time and cleaning power of the ultrasonic cleaning equipment;

[0012] After cleaning is completed, the PCBA is taken out from the tank of the ultrasonic cleaning machine, rinsed and dried, and the removable dirt on the surface of the PCBA is cleaned.

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

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

[0015] The fractional value S of the ion residue concentration of the PCBA after cleaning ICC The weight ratio is recorded as w ICC , non-volatile residue mass fraction 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 characterization value S of the PCBA after PCBA 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 an ultrasonic cleaning device based on the type of cleaning liquid and the degree of dirt on the PCBA surface. According to the cleanliness characterization value of the PCBA in historical data, negative feedback is given to the cleaning time and cleaning power of the ultrasonic cleaning device. 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 device 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 in conjunction with the accompanying drawings.

[0021] Figure 1 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 a system for ultrasonically removing dirt on a PCBA surface that can be moved according to an embodiment of the present invention;

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

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[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 solution based on the type of dirt on the PCBA surface;

[0027] The cleaning time and cleaning 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 cleanliness characterization value of PCBA in historical data, negative feedback is given to the cleaning time and cleaning power of the ultrasonic cleaning equipment to complete the dynamic correction of the cleaning time and cleaning power of the ultrasonic cleaning equipment;

[0030] After cleaning is completed, the PCBA is taken out from the tank of the ultrasonic cleaning machine, rinsed and dried, and the removable dirt on the surface of the PCBA is cleaned.

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

[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] Based on IPC-TM-650 standard, measure the resistivity of the extraction liquid;

[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, that is, heat the PCBA sample and determine 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] The insulation resistance of the cleaned PCBA is measured to obtain the insulation resistance value R measured ;

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

[0045] Among them, R threhold-low It 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 PCBA after cleaning ICC The weight ratio is recorded as w ICC , non-volatile residue mass fraction 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 cleanliness value S of the PCBA after cleaning is calculated;

[0049] in;

[0050] In practical applications, the weight w ICC 、w NVR and w IR The determination needs to be 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 PCBA cleanliness characterization value of historical cleaning with the preset PCBA cleanliness characterization threshold;

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

[0056] The PCBA whose cleanliness characterization value is greater than or equal to the PCBA cleanliness characterization range threshold is recorded as a cleaning unqualified PCBA.

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

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

[0059] That is, the cleaning power of the PCBA is taken as the Y-axis, and the PCBA cleanliness characterization value of the PCBA is taken as the X-axis to establish a second coordinate system;

[0060] In the first coordinate system, points are drawn in ascending order of PCBA cleanliness characterization values, and all the points drawn by the PCBA cleanliness characterization values ​​are connected in sequence 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 by a smooth curve to obtain a cleaning time curve of the cleaning time;

[0062] Obtain a time length interval corresponding to the cleaning time curve, recorded as a 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 order from small to large, and all the points plotted by the PCBA cleanliness characterization values ​​are connected in order with a smooth curve to obtain a second cleanliness characterization value curve of the PCBA cleanliness characterization value;

[0065] Then, the cleaning power corresponding to each PCBA cleanliness characterization value on the second cleanliness characterization value curve is plotted, and all the points plotted by the cleaning power are sequentially connected with a smooth curve to obtain a cleaning power curve of the cleaning power;

[0066] Obtaining a time interval corresponding to the cleaning power curve, recorded as a first power interval;

[0067] The first power interval is overlapped with the rated cleaning power interval, and the overlapping area of ​​the first power interval and the rated cleaning power interval is selected and recorded as the standard cleaning power interval;

[0068] Acquire 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] Acquire 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 cleaning power adjustment interval and the 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 verification 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 on a PCBA surface that can be moved, comprising:

[0076] 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 type of dirt 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 dirt 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 cleanliness characterization value of PCBA in historical data, negative feedback is given to the cleaning time and cleaning power of the ultrasonic cleaning equipment to complete the dynamic correction of the cleaning time and cleaning power of the ultrasonic cleaning equipment;

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

[0081] Example 3

[0082] Reference Figure 3 The embodiment of the present invention further provides a computer device 3, comprising: a memory 302 and 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 computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The computer device 3 may include, but is not limited to, a processor 301 and a memory 302. Those skilled in the art will appreciate that

[0084] Figure 3 It is only an example of computer device 3 and does not constitute a limitation on computer device 3. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components, for example, it 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, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[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 smart memory card (SmartMediaCard, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the computer device 3. Further, the memory 302 may also 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, an application program, a boot loader (BootLoader), 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 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 in the form of 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 processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code 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 that can carry the computer program code to the camera / terminal device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. For example, a USB flash drive, a mobile hard disk, a disk or an optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

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

[0091] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation 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 the 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 solution based on the type of dirt on the PCBA surface; The cleaning time and cleaning 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 cleanliness characterization value of PCBA in historical data, negative feedback is given to the cleaning time and cleaning power of the ultrasonic cleaning equipment to complete the dynamic correction of the cleaning time and cleaning power of the ultrasonic cleaning equipment; After cleaning is completed, the PCBA is taken out from the tank of the ultrasonic cleaning machine, rinsed and dried, and the removable dirt on the surface of the PCBA is cleaned.

2. The ultrasonic removal method for movable dirt on the PCBA surface according to claim 1 is characterized in that: 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 S NVR And insulation resistance evaluation score S IR To obtain; The fractional value S of the ion residue concentration of the PCBA after cleaning ICC The weight ratio is recorded as w ICC , non-volatile residue mass fraction 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 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.

3. The ultrasonic removal method for movable dirt on the PCBA surface according to claim 2 is characterized in that: 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 .

4. The method for ultrasonically removing movable dirt from the PCBA surface according to claim 2, characterized in that: 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 .

5. The ultrasonic removal method for movable dirt on the PCBA surface according to claim 2 is characterized in that: Insulation resistance evaluation score S IR The acquisition process is: The insulation resistance of the cleaned PCBA is measured to obtain the insulation resistance value R measured ; The threshold of the insulation resistance of the PCBA is preset to R threhold-low and R threhold-high ; Among them, R threhold-low It 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 .

6. The method for ultrasonically removing movable dirt from the PCBA surface according to claim 2, characterized in that: Traverse the cleaning data of PCBA cleaning, and compare the PCBA cleanliness characterization value of historical cleaning with the preset PCBA cleanliness characterization threshold; The PCBA whose cleanliness characterization value is less than the PCBA cleanliness characterization range threshold is recorded as a PCBA that has passed the cleaning process, and the set corresponding to the PCBA that has passed the cleaning process is obtained, recorded as Si(St, Sg), where i is the number of PCBAs that have passed the cleaning process; 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.

7. The method for ultrasonically removing movable dirt from the PCBA surface according to claim 1, characterized in that: A plane coordinate system is established 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 characterization value of the PCBA as the X-axis; That is, the cleaning power of the PCBA is taken as the Y-axis, and the PCBA cleanliness characterization value of the PCBA is taken as the X-axis to establish a second coordinate system; 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 ordered from small to large to construct a second cleanliness characterization value curve.

8. The method for ultrasonically removing movable dirt from the PCBA surface according to claim 7, characterized in that: The cleaning time corresponding to each PCBA cleanliness characterization value on the first cleanliness characterization value curve is plotted to construct a cleaning time curve; Obtain a time length interval corresponding to the cleaning time curve, recorded as a first time interval; Overlapping the first time interval with the rated cleaning time interval to obtain a standard cleaning time interval; Acquire 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; Obtaining a time interval corresponding to the cleaning power curve, recorded as a 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 the cleaning time verification interval, and the cleaning time verification interval is overlapped with the cleaning time standard interval to obtain the cleaning time adjustment interval.

9. The method for ultrasonically removing movable dirt from the PCBA surface according to claim 8, characterized in that: The cleaning power adjustment interval and the 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 verification interval; During the cleaning process of 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.

10. The ultrasonic removal system for movable dirt on PCBA surface is characterized by: include: 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 type of dirt 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 dirt 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 cleanliness characterization value of PCBA in historical data, negative feedback is given to the cleaning time and cleaning power of the ultrasonic cleaning equipment to complete the dynamic correction of the cleaning time and cleaning power of the ultrasonic cleaning equipment; The PCBA cleaning end module is used to take out the PCBA from the tank of the ultrasonic cleaning machine after cleaning, and perform rinsing and drying, that is, to complete the cleaning of movable dirt on the surface of the PCBA.

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