CN104792870A - Ultrasonic non-destructive testing method for brazing quality of electrical contact of low-voltage electrical apparatus - Google Patents
Ultrasonic non-destructive testing method for brazing quality of electrical contact of low-voltage electrical apparatus Download PDFInfo
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Abstract
The invention discloses an ultrasonic non-destructive testing method for the brazing quality of an electrical contact of a low-voltage electrical apparatus. A device adopted by the ultrasonic non-destructive testing method comprises a pulse generator, an ultrasonic probe, a special fixture for the probe, a three-dimensional precision scanning platform, a laser pen or a camera, a water tank, a workpiece fixture, a probe and workpiece surface bubble erasing part, an image collecting card, a motor drive card, an industrial control computer provided with system software, a touchable man-machine interactive operation system and a cloud service system. The method is based on the device, and batch scanning or single scanning can be realized; further, the condition monitoring is performed in the whole scanning process, the machine states including an industrial control sensor state, a motion platform sensor state, an ultrasonic probe sensor state and the like are monitored in real time, and the machine can give an alarm automatically if an abnormal condition happens.
Description
Technical field
The invention belongs to ultrasonic non-destructive inspection techniques field, be specifically related to the supersonic damage-free detection method of a kind of low-voltage electrical apparatus electric contact contact and tactile bridge welding quality.
Background technology
Electric contact is the key components in electric switch, and electric contact comprises contact and tactile bridge two parts, and the welding quality of contact and tactile bridge directly affects intensity and the contact resistance of electrical contact, and then affects its usability.Ultrasonic Nondestructive detects the method for solder joint welding quality, it is different from traditional destructive test method, any damage can not be caused to workpiece during detection, and it is more cheap to be different from other equipment prices needed for non-destructive testing (NDT) method, higher to the resolving power of defect, can be widely adopted.
For this problem, such as, a kind of supersonic image-forming damage-free detection method and detection system of electric appliance switch contact bond quality is disclosed in patent CN200310105892, based on Ultrasonic NDT principle and image processing method, water immersion focusing probe is adopted to carry out point by point scanning to switch contact faying face, the ultrasonic reflection echo rectified signal of every bit is sampled, the ultrasound scan images of composition faying face, choose appropriate threshold, use the calmodulin binding domain CaM in the method separation ultrasonoscopy of image procossing and non-calmodulin binding domain CaM, and calculate Surface bond rate.Detection system is made up of supersonic signal generator, probe, three-dimensional precise scanning platform, image pick-up card, driving stepper motor card, driving source for step motor, industrial control computer level system software.
But the method and apparatus of above-mentioned patent disclosure exists some problems, as scanned single workpiece, can not carry out batch scanning to workpiece, scan efficiency is low; For the workholder that different workpiece does not adapt; There is no the bubble considered and eliminate probe and surface of the work to the impact of testing result, operator's work under bad environment etc.
Along with the development of Non-Destructive Testing industry, the application of supersonic sounding instrument is more and more extensive, also more and more higher to their performance requirement, the uncertain meeting of the performance of checkout equipment causes the failure detected, many defective products are made not to be found and directly to put goods on the market, cause the generation of many accidents, or make good product be mistaken for defective product and cause waste, simultaneously, also inconsistent with actual conditions to the testing result of the contact workpiece of many complicated types, testing result has much room for improvement.
Summary of the invention
The defect existed for above prior art or deficiency, the object of the present invention is to provide a kind of Ultrasonic Nondestructive method of low-voltage electrical apparatus electrical contact brazing quality, the method can quick, easy, exactly detect one or a collection of electrical contact welding quality.
For realizing above-mentioned object, the technical solution used in the present invention is:
The invention provides a kind of Ultrasonic Nondestructive method of low-voltage electrical apparatus electrical contact brazing quality, comprise batch scanning and the scanning of single workpiece, comprise the following steps:
Step one: open Ultrasonic Nondestructive system;
Step 2: check ultrasound probe position, and automatically return to initial position at zero point before detecting;
Step 3: check the depth of water in reserve tank, automatically upper and lower water;
Step 4: the workpiece fixture of selected measured workpiece, is fixed on measured workpiece on workholder, and is fixed in tank by workholder, ensure the depth of parallelism of measured workpiece upper surface and surface level;
Step 5: arrange detected parameters, comprises the contact material of measured workpiece, contact thickness, the subsequent corrosion of contact, temperature, ultrasonic probe sweep limit;
Step 6: the blibbing of erasing ultrasonic probe and measured workpiece;
Step 7: use laser pen or camera to carry out Primary Location to ultrasonic probe, make ultrasonic probe be positioned at above measured workpiece contact;
Step 8: ultrasonic probe is demarcated, the consistance of scanning effect when ensureing to change ultrasonic probe;
Step 9: according to the parameter arranged, controls ultrasonic probe and realizes auto-focusing;
Step 10: determine gate of sampling;
Step 11: autoscan is carried out to the weld layer of measured workpiece, and real time imagery on a display screen, for curved surfaces workpiece and inclined-plane workpiece, add the algorithm compensation to arc-shaped surface workpiece and inclined-plane workpiece in scanning algorithm, ensure that the consistance of testing result and actual result;
Step 12: analyze weld layer ultrasonoscopy, selects threshold value, calculates the welded rate of face of weld.
Preferably, in step 3, described upper and lower water automatically, specifically comprises the steps:
Step 3.1: increase automatic charging & discharging water in Ultrasonic Nondestructive system, that is: by described Ultrasonic Nondestructive system measurement tank be connected with reserve tank, reserve tank is connected to water inlet and water delivering orifice, reserve tank top connects air pump, pressurized air can be passed into reserve tank by this air pump, and be combined with air intake opening and gas outlet, opening and closing the automatically upper and lower water realizing measuring tank by two solenoid valves;
Step 3.2: after measured workpiece puts into measurement tank appointment station, control air pump and also open air intake opening solenoid valve, close gas outlet solenoid valve, pass into pressurized air in reserve tank, water is supplemented to the height measured tank and preset; Similarly, when having measured according to the model of measured workpiece and the size of workpiece, control air pump, open air intake opening solenoid valve, open gas outlet solenoid valve, in reserve tank, pressurized air is excluded, measure tank middle water level and be reduced to suitable height, convenient operation personnel take out measured workpiece, or according to practical operation needs, the water measured in tank are all put back into reserve tank.
Preferably, in step 7, the bubble of described erasing probe and surface of the work, is adopt automatic bubble erasing parts to carry out, utilizes detecting head surface bubble to wipe the bubble of parts and surface of the work bubble erasing parts auto-erasing probe and surface of the work respectively;
Described erasing detecting head surface bubble, specifically comprises the steps:
Step 7.1: property material is fixed in measurement tank by sponge sucks in water;
Step 7.2: mobile ultrasonic probe, makes ultrasonic probe be positioned at directly over sponge;
Step 7.3: move ultrasonic probe straight down, makes ultrasonic probe contact fully with sponge, the bubble on erasing ultrasonic probe surface;
Described erasing surface of the work bubble, specifically comprises the steps:
Step 7.4: surface of the work bubble erasing parts are fixed on the Z axis of three-dimensional precise scanning platform;
Step 7.5: before carrying out ultrasonic scanning, controls surface of the work bubble erasing parts and moves downward, fully contact measured workpiece, wiped by the bubble of measured workpiece surface and surrounding.
Preferably, in step 9, described ultrasonic probe is demarcated, and specifically comprises the steps:
Step 9.1: selected standard testing block, ultrasonic probe vertical checkout block surface emitting ultrasound wave;
Step 9.2: the gain of regulating impulse generator, the echo amplitude of the reference block lower surface that ultrasonic probe is received reaches 100% of full width, i.e. 1V;
Step 9.3: keep the yield value of now pulse producer constant, complete the demarcation of ultrasonic probe;
Concrete timing signal, utilize ultrasonic probe fixed to standard testing block rower, the principle of demarcation is the gain of regulating impulse generator, makes the echo amplitude of standard testing block lower surface reach 100% of full width, i.e. 1V, and keeps the yield value of pulse producer constant.
The present invention, by above scanning step, can realize batch scanning or single sweep operation; Further, in whole scanning process, have condition monitoring, real-time monitoring equipment mesa-shaped state, comprise the state of industry control sensor, sports platform sensor states, ultrasonic probe sensor states etc., if any exception, machine will automatic alarm.
Preferably, described method comprises further can the man-machine interactive operation system of touch-control, provides the interface that a personal-machine is mutual, makes the faster and more convenient operation of operating personnel.
Preferably, described method comprises cloud service system further, as Ultrasonic Nondestructive enterprise and the intercommunion platform needing the client carrying out Non-Destructive Testing.
Owing to have employed technique scheme, the invention has the beneficial effects as follows:
1) the present invention can realize batch scanning and process, drastically increases sweep speed;
2) application of unit clamp, makes scanning result more accurate;
3) application of camera or laser pen, ensure that the accuracy of sweep limit;
4) the bubble erasing apparatus of probe and surface of the work, saves and detects setup time, also ensure that the accuracy of testing result simultaneously;
5) according to level sensing result upper and lower water automatically, save manpower, and improve the testing environment of operator;
6) man-machine interactive system platform gets final product the man-machine interactive operation system of touch-control, makes operation more convenient comfortable;
7) add the algorithm compensation to arc-shaped surface workpiece and tilting workpiece in scanning algorithm, solve curved surfaces workpiece and tilting workpiece sensing Problems existing, ensure that the consistance of testing result and actual result;
8) adopt cloud service system further, make the contact between client and research staff more effectively convenient.
Accompanying drawing explanation
Fig. 1 is the detection system block diagram that one embodiment of the present invention relates to;
Fig. 2 is the detection system hardware components schematic diagram related to of one embodiment of the present invention;
Fig. 3 is system software schematic diagram, and figure (a), (b) are the software principle block diagram of the single workpiece of scanning and batch scanning workpiece respectively;
Fig. 4 is the automatic charging & discharging water structural representation in one embodiment of the present invention;
Fig. 5 is the surface of the work bubble erasing modular construction schematic diagram in one embodiment of the present invention;
Fig. 6 is the detecting head surface bubble erasing modular construction schematic diagram in one embodiment of the present invention;
Fig. 7 is workpiece 1 (single scanning) ultrasound scan images and material picture contrast figure, and wherein (a), (b), (c) are respectively pictorial diagram and scintigram;
Fig. 8 is workpiece 2 (batch scanning) ultrasound scan images and material picture contrast figure, and wherein (a), (b) are respectively pictorial diagram and scintigram;
In figure: 1 is pulse producer, 2 is ultrasonic probe, 3 is three-dimensional precise scanning platform, 4 is electric machine controller, 5 is motor driver card, 6 is automatic charging & discharging water, 7 is Industrial PC, 8 is Ultrasonic Nondestructive system software, 9 is image pick-up card, 10 is complete machine framework and protective device, 11 is tank, 12 is measured workpiece, 13 is workholder, 14 is operator's console, 15 is water tank, 16 is database management module, 17 is detected parameters data block, 18 is parameter input module, 19 is interface initialization module, 20 is automatically select fixture module, 21 for removing detecting head surface bubble module, 22 for showing bubble module except workpiece, 23 is probe Primary Location module, 24 is automatic focus module, 25 is A, C scan module, 26 is signal and image processing module, 27 is defect analysis and processing module, 28 is image data base, 29 is prescription management module, 30 is batch scanning module, 31 is water-supply-pipe, 32 is the first hand valve, 33 is air pump, 34 is the first solenoid valve, 35 is the second solenoid valve, 36 is the second hand valve, 37 is the 3rd hand valve, 38 is surface of the work bubble erasing water suction flexible material, 39 is surface of the work bubble erasing fixed part, 40 is column (Z axis), 41 is the first cylinder, 42 is the second cylinder, 43 is detecting head surface bubble erasing water suction flexible material, 44 is detecting head surface bubble erasing fixed part.
Embodiment
Be further described technical scheme of the present invention below, the following description is only the use understanding technical solution of the present invention, and be not used in and limit scope of the present invention, protection scope of the present invention is as the criterion with claims.
As shown in Figure 1, for the System Working Principle figure that one embodiment of the invention low voltage switch contact lossless detection method adopts, comprise pulse producer 1, ultrasonic probe 2, probe unit clamp, three-dimensional precise scanning platform 3, laser pen or camera, tank 11, workholder 13, probe and the erasing of surface of the work bubble parts, image pick-up card, motor driver card, industrial control computer.
Described pulse producer 1 connects described ultrasonic probe 2, and described ultrasonic probe 2 connects image pick-up card 9;
Described probe unit clamp, comprise for the parts of fixing ultrasonic probe 2 and the parts for fixation workpiece blibbing erasing parts, ultrasonic probe 2 and three-dimensional precise scanning platform 3 are fixed together by this fixture;
Described three-dimensional precise scanning platform 3, is made up of X-axis, Y-axis, Z axis three-dimensional motion module, and X-axis and Y-axis drive ultrasonic probe 2 realize the motion in surface level, and Z axis drives ultrasonic probe 2 to realize vertical movement;
Described laser pen or camera are arranged on described three-dimensional precise scanning platform 3;
Described tank 11, for holding couplant and fixed workpiece-holder 13 and detecting head surface bubble erasing parts;
Described image pick-up card 9, motor driver card are arranged on industrial control computer inside, industrial control computer is realized by bus and image pick-up card 9, communication and control between motor driver card, industrial control computer connects the electric machine controller of three-dimensional precise scanning platform 3 by motor driver card, realizes the control of moving to three-dimensional precise scanning platform 3; Positional information is fed back to image pick-up card 9 by the electric machine controller of three-dimensional precise scanning platform 3 simultaneously.
In the present embodiment, motor driver card is connected with motor drive power supply and is connected with three-dimensional precise scanning platform 3 by motor drive power supply, ultrasonic probe 2 is connected with image pick-up card and three-dimensional precise scanning platform 3 respectively, and motor drive power supply drives ultrasonic probe 2 to move by three-dimensional precise scanning platform 3; Laser pen or camera are fixed on three-dimensional precise scanning platform 3; Workholder and detecting head surface bubble erasing parts are fixed in the sink, and surface of the work bubble erasing parts are arranged on three-dimensional precise scanning platform 3.
Image pick-up card 9, motor driver card 5 are connected with Industrial PC 7 i.e. industrial control computer; Electric machine controller 4 controls three-dimensional precise scanning platform 3 and drives ultrasonic probe 2 to move, and motor driver card 5 can control automatic charging & discharging water 6 simultaneously; The electric pulse that ultrasonic probe 2 received pulse generator 1 sends, launch the ultrasound wave of certain frequency and intensity, measured workpiece 14 surface and weld layer reflecting is arrived by couplant, reflection wave is received by ultrasonic probe 2, and be sent to image pick-up card 9, under the Ultrasonic Nondestructive system software 8 that Industrial PC 7 carries acts on, carry out exchanges data by image pick-up card 9 and store and imaging display.
As shown in Figure 2, the schematic diagram of the hardware adopted for the Ultrasonic Nondestructive method of low-voltage electrical apparatus electric contact brazing quality.In figure: the electric wirings such as various opertaing devices are protected by complete machine framework and protective device 10, the protection of the water tank 15 of automatic charging & discharging water 6 is got up simultaneously; Three-dimensional precise scanning platform 3 is made up of X-axis, Y-axis, Z axis three-dimensional motion module, each dimension motion module is made up of leading screw and motor, the motion that X-axis and Y-axis make ultrasonic probe 2 realize in surface level, Z axis makes ultrasonic probe 2 realize vertical movement, according to detected parameters, drive ultrasonic probe 2 according to the scanning pattern of specifying, realize the focusing to measured workpiece 12 and scanning; The leading screw of three-dimensional precise scanning platform 3 can select ball-screw, motor can select servomotor or stepper motor, and its movement velocity is 40mm/s ~ 50mm/s; Ultrasonic probe 2 is fixed on the bottom of the Z axis column of three-dimensional precise scanning platform 3, and does the motion in X-axis, Y-axis, Z axis three directions with three-dimensional precise scanning platform 3, completes scan function; Measured workpiece 12 is fixed in tank 13 by workholder 13, and ensures that measured workpiece 12 is detected the level in face, and the water simultaneously in tank 11 is couplant, performs Ultrasonic Nondestructive function software 8 by operator's console 14; The interface of operator's console 14 is human-computer interaction interfaces, makes the faster and more convenient operation of operating personnel.
As shown in Figure 3, be software section schematic diagram in the inventive method one embodiment, wherein (a), (b) are the software principle block diagram of the single workpiece of scanning and batch scanning workpiece respectively.Described system software is arranged in industrial control computer 7, specifically comprise database management module 16, detected parameters database 17, parameter input module 18, interface initialization module 19, automatically select fixture module 20, except detecting head surface bubble module 21, except surface of the work bubble module 22, probe Primary Location module 23, automatic focus module 24, A, C scan module 25, signal and image processing module 26, defect analysis and processing module 37 and image data base 28, as shown in (a) in Fig. 3.If batch scanning, prescription management module 29 and batch scanning module 30 also will be increased in software systems, as shown in (b) in Fig. 3.
In the present embodiment, described detected parameters database module 17, can input the information such as the temperature of testing environment, the depth of water, and be kept at database management module 16.
In the present embodiment, described parameter input module 18, user can input the basic parameter of measured workpiece 12, comprises the material of contact, shape, size etc.
In the present embodiment, described interface initialization module 19 is that system carries out initialization before detecting.
In the present embodiment, described automatic selection fixture module 20, can select the fixture of the measured workpiece of Ultrasonic Nondestructive, select suitable workholder according to different measured workpieces; Carry out erasing detecting head surface bubble, erasing surface of the work bubble afterwards, now, system will carry out probe Primary Location and auto-focusing, after auto-focusing, select A, C scan mode to scan measured workpiece, after the end of scan, utilize signal and image processing module 26 pairs of scanning results to process; Then, the result of signal and image processing module 26 is saved in image data base 28, meanwhile, further utilizes defect analysis and processing module 27 pairs of scanning results to evaluate.
In the present embodiment, described prescription management module 29, its effect is editor, manages fixture and workpiece information and configure accordingly, when detecting certain a collection of workpiece, from the prescription that prescription management model choice is corresponding.
In the present embodiment, described batch scanning module 30, its effect is when scanning a collection of multiple identical workpiece, and correspond to the configuration of this batch of workpiece from batch scanning model choice, ultrasonic probe carries out batch scanning according to this configuration.
As a preferred implementation, as shown in Figure 4, the automatic charging & discharging water 6 related in the inventive method, this device comprises: water-supply-pipe 31 (water delivery parts), the first hand valve 32, water tank 15 (water storage parts), air pump 33, first solenoid valve 34 (i.e. air intake opening solenoid valve), the second solenoid valve 35 (i.e. gas outlet solenoid valve), the second hand valve 36 and the 3rd hand valve 37, wherein: tank 11 is connected with described water tank 15 by described water-supply-pipe 31; Water-supply-pipe 31 is provided with described first hand valve 32, controls opening of described water-supply-pipe 31 by described first hand valve 32 and close; One end, water tank 15 top is connected with air pump 33 for pressurized air being passed into reserve tank, water tank 15 is provided with the second solenoid valve 35 (i.e. gas outlet solenoid valve) simultaneously; The passage connecting air pump 33 at water tank 15 is provided with the first solenoid valve 34 (i.e. air intake opening solenoid valve); Described first solenoid valve 34 and the second solenoid valve 35 form air intake opening and the gas outlet of described air pump 33 respectively; Described second hand valve 36 and the 3rd hand valve 37 control water inlet and the water delivering orifice of described water tank 15 respectively.
In the present embodiment, described air pump 33 adopts electric air pump.
In the present embodiment, described first solenoid valve and the second solenoid valve adopt Unidirectional solenoid valve.
In the present embodiment, described first hand valve, the second hand valve and the 3rd hand valve adopt manual ball valve.
As a preferred implementation, as shown in Figure 5, the detecting head surface bubble erasing parts related in the inventive method one embodiment, comprise: the water suction flexible material 38 of detecting head surface bubble erasing apparatus and fixed part 39 thereof, column 40 (the Z axis column of three-dimensional precise scanning platform 3 can be adopted), first cylinder 41, second cylinder 42, wherein: described water suction flexible material 38 is for wiping measured workpiece blibbing; Described fixed part 38 is for fixing water suction flexible material 38, and water suction flexible material 38 is fixed on the lower surface of described fixed part 38; The bottom of described column 40 connects water suction flexible material 38 and fixed part 39, and water suction flexible material 38 and fixed part 39 can with described column 40 precise motion; Described first cylinder 41 is for driving column 40, and the motion of described first cylinder 41 is realized by the folding of software control solenoid valve; Described second cylinder 42 is for controlling the motion of water suction flexible material 38 vertical direction, and the motion of described second cylinder 42 is realized by the folding of host computer control solenoid valve.
As a preferred implementation, as shown in Figure 6, described detecting head surface bubble erasing parts, comprising: detecting head surface bubble erasing water suction flexible material 43 and fixed part 44 thereof, and wherein, described fixed part is fixing in the sink; Described detecting head surface bubble erasing water suction flexible material is fixed on fixed part.The shape of described detecting head surface bubble erasing water suction flexible material is thumb, time above motion of ultrasound probe to described detecting head surface bubble erasing water suction flexible material, extrudes described detecting head surface bubble erasing water suction flexible material straight down, by bubble removal.
As a preferred implementation, described method comprises further can the man-machine interactive operation system of touch-control, can the man-machine interactive operation system of touch-control be connected with industrial control computer; The interface that one personal-machine is mutual is provided, makes the faster and more convenient operation of operating personnel.
As a preferred implementation, described method comprises cloud service system further, as Ultrasonic Nondestructive enterprise and the intercommunion platform needing the client carrying out Non-Destructive Testing; In described cloud service system, client can provide the essential information of measured workpiece to enterprise, comprise material, size, and the report of the Ultrasonic Nondestructive of the measured workpiece of client can be sent to client by the mode of internet by enterprise; Meanwhile, enterprise operations personnel by Ultrasonic Nondestructive system produced problem or fault, can submit to the research staff of enterprise by cloud service system, ensure that in enterprise, client, enterprise, operating personnel exchange with the quick of research staff.
Preferably, a kind of Ultrasonic Nondestructive method of low-voltage electrical apparatus electrical contact brazing quality, specific implementation process is as follows:
Step one: by above-mentioned Ultrasonic Nondestructive system can be opened by touch control operation platform 14;
Step 2: the position checking ultrasonic probe 2, and before detecting, automatically return to initial position at zero point;
Step 3: check the depth of water in water tank 15, automatically upper and lower water;
Step 4: by can touch control operation platform 14 user divide role to log in the operating system of Ultrasonic Nondestructive, role assignments mainly contains operative employee, process engineer and system manager, operative employee's primary responsibility be perform Ultrasonic NDT operation; Process engineer, except can performing Ultrasonic NDT operation, can also configure the information of workholder and check examining report; System manager, except can performing the information of Ultrasonic NDT operation and configuration workholder and checking except examining report, also has the authority of system maintenance and renewal; For process engineer, enter the operation interface of Ultrasonic Nondestructive, perform detected parameters configuration interface, comprise typing and detect batch number;
Step 5: the workholder 13 of selected measured workpiece 12, be fixed on workholder 13 by measured workpiece 12, and be fixed in tank 11 by workholder 13, object is the depth of parallelism ensureing measured workpiece 12 upper surface and surface level, ensure measuring accuracy, can also productive rate be improved simultaneously;
Step 6: arrange detected parameters, mainly comprises the subsequent corrosion, temperature, ultrasonic probe sweep limit etc. of the contact material of measured workpiece 12, contact thickness, contact;
Step 7: the blibbing of erasing ultrasonic probe 2 and measured workpiece 12;
Step 8: use laser pen or camera to carry out Primary Location to ultrasonic probe 2, make ultrasonic probe 2 be positioned at above measured workpiece 12 contact;
Step 9: demarcate ultrasonic probe 2, ensures the consistance changing the rear scanning effect of ultrasonic probe 2;
Step 10: according to the parameter arranged, three-dimensional precise scanning platform 3 controls ultrasonic probe 2 and realizes auto-focusing;
Step 11: according to the A total number certificate of measured workpiece, determines gate of sampling;
Step 12: autoscan is carried out to the weld layer of measured workpiece 12, and real time imagery on a display screen;
Step 13: analyze weld layer ultrasonoscopy, select suitable threshold value, calculates the welded rate of face of weld;
Step 14: automatically generate test report, and printing test report as required.
As a preferred implementation, in the present embodiment step 3, described upper and lower water automatically, specifically comprises the steps:
Step 3.1: increase automatic charging & discharging water 6 in Ultrasonic Nondestructive system, that is: the tank 11 of described Ultrasonic Nondestructive system is connected to water tank 15, water tank 15 is connected to water inlet and water delivering orifice, water tank 15 top connects air pump, pressurized air can be passed into water tank 15 by this air pump, and be combined with air intake opening and gas outlet, opening and closing the automatically upper and lower water realizing tank 11 by two solenoid valves;
Step 3.2: put into after tank 11 specifies station at measured workpiece 12, control air pump and also open air intake opening solenoid valve, close gas outlet solenoid valve, pass into pressurized air in water tank 15, water is supplemented to the height that tank 11 presets; Similarly, when having measured according to the model of measured workpiece 12 and size, control air pump, open air intake opening solenoid valve, open gas outlet solenoid valve, in water tank 15, pressurized air is excluded, tank 11 middle water level is reduced to suitable height, convenient operation personnel take out measured workpiece 12, or according to practical operation needs, the water in tank 11 are all put back into water tank 15.
As a preferred implementation, in the present embodiment step 7, described erasing probe and surface of the work bubble, adopt automatic bubble to wipe parts and carry out, and utilizes detecting head surface bubble to wipe the bubble of parts and surface of the work bubble erasing parts auto-erasing probe and surface of the work respectively.
As a preferred implementation, in the present embodiment, described erasing detecting head surface bubble, specifically comprises the steps:
Step 7.1: the water-absorbing materials such as sponge are fixed in tank 11;
Step 7.2: mobile ultrasonic probe 2, makes ultrasonic probe 2 be positioned at directly over sponge;
Step 7.3: move ultrasonic probe 2 straight down, makes ultrasonic probe 2 contact fully with sponge, the bubble on erasing ultrasonic probe surface.
As a preferred implementation, in the present embodiment, in like manner, described erasing surface of the work bubble, specifically comprises the steps:
Step 7.4: surface of the work bubble erasing parts are fixed on the Z axis of three-dimensional precise scanning platform 3;
Step 7.5: before carrying out ultrasonic scanning, wipes parts by servomotor drive surface of the work bubble and moves downward, fully contact measured workpiece 12, wiped by the bubble of measured workpiece 12 surface and surrounding.
As a preferred implementation, in the present embodiment step 8, described use laser pen or camera carry out Primary Location to ultrasonic probe 2, specifically comprise the steps:
Step one: test piece is fixed in the sink;
Step 2: mobile ultrasonic probe, until the illumination that laser pen sends is mapped to test piece on the surface, or test piece enters in the visual field of camera, further movement, make the central point of laser pen or camera and the center superposition of test piece, obtain and preserve the position of now laser pen or camera;
Step 3: according to the station-keeping data of known laser pen or camera and ultrasonic probe, the position of switched laser pen or camera and ultrasonic probe, make the position that ultrasonic probe arrival laser pen or camera are preserved before this, now, ultrasonic probe is positioned at position directly over test piece center.
As a preferred implementation, in the present embodiment step 9, described ultrasonic probe is demarcated, and specifically comprises the steps:
Step 9.1: selected standard testing block, ultrasonic probe 2 vertical checkout block surface emitting ultrasound wave;
Step 9.2: the gain of regulating impulse generator 1, the echo amplitude of the standard testing block lower surface that ultrasonic probe 2 is received reaches 100% of full width, i.e. 1V;
Step 9.3: keep the yield value of now pulse producer 1 constant, complete the demarcation of ultrasonic probe 12.
The present embodiment is at concrete timing signal, and utilize ultrasonic probe 2 pairs of standard testing blocks to demarcate, the principle of demarcation is, the gain of regulating impulse generator 1, make the echo amplitude of standard testing block lower surface reach 100% of full width, i.e. 1V, and keep the yield value of pulse producer 1 constant.
As a preferred implementation, in described step 11: for curved surfaces workpiece and inclined-plane workpiece, add the algorithm compensation to arc-shaped surface workpiece and inclined-plane workpiece in scanning algorithm, ensure that the consistance of testing result and actual result.
By above scanning step, batch scanning or single sweep operation can be realized.
With reference to Fig. 7, as shown in (a), (b), (c) in Fig. 7, be respectively photo in kind and the detected image of the round soldering interface of low-voltage electrical apparatus moving contact.Use method of the present invention and pick-up unit system as seen from Figure 7, can to the imaging of contact face of weld, and resolution is higher, demonstrates feasibility of the present invention and validity.
With reference to Fig. 8, as shown in (a), (b) in Fig. 8, be the result of batch scanning, when batch scanning, multiple workpiece be placed on the enterprising line scanning of unit clamp, wherein list the scanning result of a workpiece, other slightly.Decrease the sweep time of batch largely.
The foregoing is only section Example of the present invention, not do any restriction to technical scope of the present invention, all any amendments made within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a Ultrasonic Nondestructive method for low-voltage electrical apparatus electrical contact brazing quality, is characterized in that, comprise the following steps:
Step one: open Ultrasonic Nondestructive system;
Step 2: check ultrasound probe position, and automatically return to initial position at zero point before detecting;
Step 3: check the depth of water in reserve tank, automatically upper and lower water;
Step 4: the workpiece fixture of selected measured workpiece, is fixed on measured workpiece on workholder, and is fixed in tank by workholder, ensure the depth of parallelism of measured workpiece upper surface and surface level;
Step 5: arrange detected parameters, comprises the contact material of measured workpiece, contact thickness, the subsequent corrosion of contact, temperature, ultrasonic probe sweep limit;
Step 6: the blibbing of erasing ultrasonic probe and measured workpiece;
Step 7: use laser pen or camera to carry out Primary Location to ultrasonic probe, make ultrasonic probe be positioned at above measured workpiece contact;
Step 8: ultrasonic probe is demarcated, the consistance of scanning effect when ensureing to change ultrasonic probe;
Step 9: according to the parameter arranged, controls ultrasonic probe and realizes auto-focusing;
Step 10: determine gate of sampling;
Step 11: autoscan is carried out to the weld layer of measured workpiece, and real time imagery on a display screen;
Step 12: analyze weld layer ultrasonoscopy, selects threshold value, calculates the welded rate of face of weld.
2. the Ultrasonic Nondestructive method of a kind of low-voltage electrical apparatus electrical contact brazing quality as claimed in claim 1, is characterized in that, in step 3, described upper and lower water automatically, specifically comprises the steps:
Step 3.1: by Ultrasonic Nondestructive system measurement tank be connected with reserve tank, reserve tank is connected to water inlet and water delivering orifice, reserve tank top connects air pump, pressurized air is passed into reserve tank by this air pump, and be combined with air intake opening and gas outlet, opening and closing the automatically upper and lower water realizing measuring tank by two solenoid valves;
Step 3.2: after measured workpiece puts into measurement tank appointment station, control air pump and also open air intake opening solenoid valve, close gas outlet solenoid valve, pass into pressurized air in reserve tank, water is supplemented to the height measured tank and preset; Similarly, when having measured according to the model of measured workpiece and the size of workpiece, control air pump, open air intake opening solenoid valve, open gas outlet solenoid valve, in reserve tank, pressurized air is excluded, measure tank middle water level and be reduced to suitable height, convenient operation personnel take out measured workpiece, or according to practical operation needs, the water measured in tank are all put back into reserve tank.
3. the Ultrasonic Nondestructive method of a kind of low-voltage electrical apparatus electrical contact brazing quality as claimed in claim 1, it is characterized in that, in step 6, the bubble of described erasing probe and surface of the work, be adopt automatic bubble erasing parts to carry out, utilize detecting head surface bubble to wipe the bubble of parts and surface of the work bubble erasing parts auto-erasing probe and surface of the work respectively.
4. the Ultrasonic Nondestructive method of a kind of low-voltage electrical apparatus electrical contact brazing quality as claimed in claim 3, is characterized in that, described erasing detecting head surface bubble, specifically comprises the steps:
Step 7.1: property material is fixed in measurement tank by sponge sucks in water;
Step 7.2: mobile ultrasonic probe, makes ultrasonic probe be positioned at directly over sponge;
Step 7.3: move ultrasonic probe straight down, makes ultrasonic probe contact fully with sponge, the bubble on erasing ultrasonic probe surface.
5. the Ultrasonic Nondestructive method of a kind of low-voltage electrical apparatus electrical contact brazing quality as claimed in claim 3, is characterized in that, described erasing surface of the work bubble, specifically comprises the steps:
Step 7.4: surface of the work bubble erasing parts are fixed on the Z axis of three-dimensional precise scanning platform;
Step 7.5: before carrying out ultrasonic scanning, controls surface of the work bubble erasing parts and moves downward, fully contact measured workpiece, wiped by the bubble of measured workpiece surface and surrounding.
6. the Ultrasonic Nondestructive method of a kind of low-voltage electrical apparatus electrical contact brazing quality as described in any one of claim 1-5, is characterized in that, in step 8, described ultrasonic probe is demarcated, and specifically comprises the steps:
Step 9.1: selected standard testing block, ultrasonic probe vertical checkout block surface emitting ultrasound wave;
Step 9.2: the gain of regulating impulse generator, the echo amplitude of the reference block lower surface that ultrasonic probe is received reaches 100% of full width;
Step 9.3: keep the yield value of now pulse producer constant, complete the demarcation of ultrasonic probe.
7. the Ultrasonic Nondestructive method of a kind of low-voltage electrical apparatus electrical contact brazing quality as claimed in claim 6, is characterized in that concrete timing signal utilizes ultrasonic probe to demarcate standard workpiece; The principle of demarcating is the gain of regulating impulse generator, makes the echo amplitude of reference block lower surface reach 100% of full width, and keeps the yield value of pulse producer constant.
8. the Ultrasonic Nondestructive method of a kind of low-voltage electrical apparatus electrical contact brazing quality as described in any one of claim 1-5, it is characterized in that, in described step 11: for curved surfaces workpiece and inclined-plane workpiece, add the algorithm compensation to arc-shaped surface workpiece and inclined-plane workpiece in scanning algorithm, ensure that the consistance of testing result and actual result.
9. the Ultrasonic Nondestructive method of a kind of low-voltage electrical apparatus electrical contact brazing quality as described in any one of claim 1-5, it is characterized in that, described method comprises further can the man-machine interactive operation system of touch-control, the interface that one personal-machine is mutual is provided, makes the faster and more convenient operation of operating personnel.
10. the Ultrasonic Nondestructive method of a kind of low-voltage electrical apparatus electrical contact brazing quality as described in any one of claim 1-5, it is characterized in that, described method comprises cloud service system further, as Ultrasonic Nondestructive enterprise and the intercommunion platform needing the client carrying out Non-Destructive Testing; In described cloud service system, client provides the essential information of measured workpiece to enterprise, comprises material, size, and the report of the Ultrasonic Nondestructive of the measured workpiece of client can be sent to client by the mode of internet by enterprise; Meanwhile, enterprise operations personnel, by Ultrasonic Nondestructive system produced problem or fault, submit to the research staff of enterprise by cloud service system, ensure that in enterprise, client, enterprise, operating personnel exchange with the quick of research staff.
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