CN116698641A - Solder mask hardness testing device of PCB - Google Patents
Solder mask hardness testing device of PCB Download PDFInfo
- Publication number
- CN116698641A CN116698641A CN202310912035.1A CN202310912035A CN116698641A CN 116698641 A CN116698641 A CN 116698641A CN 202310912035 A CN202310912035 A CN 202310912035A CN 116698641 A CN116698641 A CN 116698641A
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- 229910000679 solder Inorganic materials 0.000 title claims abstract description 45
- 238000007542 hardness measurement Methods 0.000 title claims description 4
- 238000001514 detection method Methods 0.000 claims abstract description 172
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 230000001360 synchronised effect Effects 0.000 claims description 22
- 230000007246 mechanism Effects 0.000 claims description 15
- 230000009471 action Effects 0.000 claims description 11
- 230000003028 elevating effect Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims 2
- 238000003466 welding Methods 0.000 claims 2
- 238000000034 method Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000000227 grinding Methods 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The application provides a device for testing the hardness of a solder mask of a PCB, which is applied to the field of PCB detection.
Description
Technical Field
The application relates to the field of PCB detection, in particular to a device for testing the hardness of a solder mask of a PCB.
Background
The solder mask on the surface of the PCB is a permanent protective layer of the PCB, commonly known as green oil, and plays roles of moisture resistance, corrosion resistance, mildew resistance and mechanical scratch resistance so as to ensure good electrical functions of the PCB.
Because the solder resist process and the character process of the circuit board are two manufacturing processes which are carried out from top to bottom, the solder resist surface of the circuit board is usually checked and repaired before the character process so as to ensure the control of defective products. At present, the hard detection mode of the PCB solder mask adopts standard test pencils, and the hardness is ordered: 4B > 3B > 2B > HB > F > H > 2H > 3H > 4H > 5H > 6H, the test procedure is: the circuit board is placed on a flat surface, a standard test pen is used for scraping a certain range of hardness on the board until no scratch exists, the lowest hardness of a pencil is recorded, the hardness of a solder mask is determined, the detection mode is low in efficiency, only sampling detection can be carried out on products, the hardness of the solder mask of the whole products is not accurately controlled, the existing hardness detectors on the market are destructive detection, such as Rockwell hardness tester and Brinell hardness tester, an indentation is formed on the surface of the PCB in detection, and the printed circuit inside the PCB is seriously affected.
Disclosure of Invention
The application aims to design an automatic hardness testing device to solve the problem of a traditional manual detection mode, so that the detection efficiency and quality of the hardness of a solder mask of a PCB are improved;
the detection pens are rotationally connected to the overturning platform at equal intervals, the detection pens are synchronously driven to rotate by the servo motor, detection pieces are adsorbed at the bottom ends of the detection pens through air pressure, the detection pieces are of a hemispherical shell-shaped solid structure prepared by mixing graphite with clay, the hardness of the detection pieces on the detection pens is sequentially distributed from small to large, and a feed cylinder for providing the detection pieces for the detection pens is further arranged on one side of the lifting platform;
the bottom of the detection pen is also provided with two groups of conductive contacts which are symmetrically arranged, the conductive contacts are used for judging the electrification property of the detection piece, and the hardness data of the PCB solder mask is fed back through the rotation consumption state of the detection piece.
Furthermore, the number of the detection pens is not less than three, and the hardness of the detection pieces on the plurality of detection pens is distributed according to the pencil hardness grade of 4B & gt3B & gt2B & gtHB & gtF & gtH & gt2H & gt3H & gt4H & gt5H & gt6H.
Further, the detection pen comprises a pen tube, the top of the pen tube is fixed with a synchronous gear, synchronous toothed belts are sleeved on the outer sides of the synchronous gears, and the synchronous toothed belts are driven by a servo motor.
Further, the lifting mechanism comprises a lifting support, a lifting cylinder is fixed on one side of the lifting support, the output end of the lifting cylinder is fixed on one side of the top of the lifting table, and the overturning table is rotationally connected in the lifting table through a stepping motor.
Further, the bottom of the lifting platform is fixed with an alignment pin, and the top of the jig is provided with an alignment hole corresponding to the alignment pin.
Further, two groups of positioning grooves and two groups of openings are symmetrically arranged on the detection piece, and an axial clamping angle between symmetrical axes of the two groups of positioning grooves and symmetrical axes of the two groups of openings is smaller than ninety degrees.
Further, the top of the pen tube is connected with a negative pressure mechanism through a rotary joint, a negative pressure channel is arranged in the pen tube, a release channel is also symmetrically arranged in the negative pressure channel, the negative pressure mechanism provides negative pressure of a design value for the negative pressure channel, a rotary sleeve is rotationally sleeved on the inner side of the bottom of the pen tube, a lifting sleeve is sleeved on the inner side of the top of the rotary sleeve, a piston matched with the negative pressure channel is fixed on the top of the lifting sleeve, a release port corresponding to the release channel is also arranged on the sleeve body of the lifting sleeve, a sealing ring is fixed on the outer wall of the lifting sleeve at the bottom of the release port, and a reset spring is clamped between the sealing ring and the negative pressure channel;
the bottom of the rotary sleeve is fixedly provided with a sucker, positioning blocks corresponding to the positioning grooves are symmetrically fixed on the sucker, the conductive contact points are fixed on one side opposite to the positioning blocks, a plurality of spiral grooves distributed at equal angles are further arranged in the rotary sleeve, balls corresponding to the spiral grooves one by one are fixed at the bottom of the lifting sleeve, limiting sliding grooves are further symmetrically arranged on the outer wall of the lifting sleeve, and limiting sliding blocks matched with the limiting sliding grooves are arranged in the negative pressure channel.
Further, the feed cylinder slope sets up downwards, the section of thick bamboo wall internal fixation of feed cylinder has two sets of guide rails with constant head tank assorted, the bottom nozzle of feed cylinder still is equipped with two sets of locking pieces corresponding with the opening, when the detection piece was placed at the feed cylinder along the guide rail, the casing indent face of detection piece set up downwards, the symmetry axis of two sets of openings on the detection piece and the symmetry axis symmetry setting of two sets of locking pieces on the feed cylinder this moment, the guide rail bottom and the constant head tank that sets up on the detection piece of feed cylinder bottom do not contact.
Furthermore, the middle part of the outer wall of the pen tube is also fixed with an electromagnetic ring, a tension spring is clamped between the electromagnetic ring and the lifting table, the electromagnetic ring has magnetic attraction to the lifting table under the electrifying condition, and the pen tube can perform displacement action in the compression stroke of the tension spring along the up-down direction on the lifting table.
Compared with the prior art, the application has the advantages that:
(1) The detection principle of the detection pen is that the detection piece at the bottom of the detection pen is driven to rotate on the surface of the solder mask of the PCB, when the detection piece is smaller than the hardness of the solder mask, the detection piece is consumed by spin grinding until the detection piece breaks, at the moment, the conduction effect of the detection piece is lost between two groups of conductive contacts on the detection pen, the detection current is lost, the hardness level of the solder mask can be judged, if the detection piece with the hardness of B is consumed, and the detection piece with the hardness of 2B is not consumed, the hardness of the solder mask can be judged to be 2B.
(2) The detection piece is designed into a semispherical shell-shaped solid structure, when the detection piece encounters a PCB with hardness smaller than that of the detection piece, the detection piece is not easy to wear and consume, the semispherical shell structure is utilized to maintain supporting strength, repeated use is realized, when the detection piece encounters a PCB with hardness larger than that of the detection piece, the wear and consumption is carried out, the stability of the semispherical shell structure is damaged, the characteristic of easy breakage in the single rotation consumption process is ensured, and the detection accuracy is sequentially improved.
(3) Through the meshing action between the synchronous toothed belt and the synchronous gear at the top of the pen tubes, the servo motor synchronously drives a plurality of pen tubes to synchronously rotate, so that the synchronism of detection is improved.
(4) Through the drive of lift cylinder, drive elevating platform upper and lower displacement, realize detecting the contact clearance adjustment of pen bottom and PCB board upper surface, combine the guide action of counterpoint round pin and counterpoint hole simultaneously, can effectively keep elevating platform and tool to make the detection pen in rotatory action that detects, can not take place the phenomenon of skew shake, promoted detection stability.
(5) Through the structural design of the detection piece with the opening and the positioning groove and the feed cylinder with the guide rail and the locking piece, the feed cylinder is obliquely downwards arranged, the detection piece is conveniently put into the feed cylinder from the top of the feed cylinder along the guide rail, the detection piece moves downwards to the bottom of the feed cylinder by utilizing the self gravity of the detection piece, the detection piece at the bottom end of the feed cylinder is separated from the guide rail, and the detection piece is prevented from being separated from the opening by the dislocation design of the locking piece and the opening.
(6) Through the detection pen design that has swivel mount, lift cover, before in-service use's in-process, the detection pen is overturned to certain angle under the drive of roll-over table, make the bottom of detection pen set up relatively with the output of feed cylinder, and keep sucking disc and feed cylinder bottom's detection piece concave surface to be involuted, provide the negative pressure through rotary joint in the negative pressure passageway this moment, utilize the negative pressure to drive lift cover and overcome reset spring's elasticity and shift up, in the in-process that the lift cover was shifted up, when release mouth and release passageway butt joint, the negative pressure can transmit to the sucking disc, make sucking disc adsorb the detection piece, in the in-process that the lift cover was shifted up continuously, utilize the cooperation of ball and helicla flute, drive swivel mount and take place to rotate, make sucking disc absorptive detection piece synchronous rotation, and then make the locking piece involution with the opening, make detection piece and feed cylinder break away from, accomplish the material loading action of detection pen.
(7) During detection, the detection pen is driven to reset by the overturning table, the vertical shape of the detection pen is kept to be in contact with the surface of the solder mask of the PCB to be tested, rotation is carried out under the driving of the synchronous toothed belt, when the detection piece is smaller than the hardness of the solder mask, the detection pen can be rotationally worn to fracture, at the moment, the conduction effect of the detection piece is lost between two groups of conductive contacts on the detection pen, the detection current is lost, the hardness level of the solder mask can be judged, if the detection piece with the hardness of B is consumed, and the detection piece with the hardness of 2B is not consumed, and the hardness of the solder mask can be judged to be 2B.
(8) When the detection piece breaks, the residual piece of the detection piece is adsorbed by utilizing the negative pressure in the negative pressure channel and moves upwards and is collected, so that the surface of the detected PCB has no impurity residue, and the cleanliness of the detection station is maintained.
(9) According to the application, the hardness of the PCB with the hardness index and the hardness of the PCB without the hardness index can be detected through the pen tube with the electromagnetic ring, wherein when the PCB with the hardness index is detected, three groups of detection pieces adjacent to the hardness index are selected, if the hardness index of the PCB is B, the corresponding selected detection pieces are 2B, B, HB groups, the detection pens corresponding to the other detection pieces are moved up to the maximum stroke through the magnetic attraction of the electromagnetic ring, so that the synchronous gear is separated from the synchronous toothed belt, the whole-process rotary joint is kept closed, the selected three groups of detection pieces are kept to work, and the detection efficiency and pertinence are improved;
the method is characterized in that the hardness detection of the PCB solder mask without the hardness index is performed, the detection parts with all the hardness are kept to participate in the measurement in the whole process, the detection parts are fully contacted with the detected PCB by utilizing the downward force of the tension spring to the electromagnetic ring in the detection process, and the detection precision is improved.
Drawings
FIG. 1 is a schematic view of a rotary station and a lifting mechanism on a frame according to the present application;
fig. 2 is a schematic diagram of a front structure of a lifting mechanism and a jig according to the present application;
FIG. 3 is a schematic diagram of the bottom structure of the lifting mechanism and the jig according to the present application;
fig. 4 is a schematic diagram of front arrangement of the detection pen on the overturning platform according to the present application;
FIG. 5 is a schematic diagram showing the arrangement of the bottom surface of the detection pen on the overturning platform;
FIG. 6 is a schematic view of a partial cross-sectional structure of a test pen according to the present application;
FIG. 7 is a schematic diagram of an explosion structure of a test pen according to the present application;
FIG. 8 is a perspective view of the construction of the rotating sleeve proposed in the present application;
FIG. 9 is a perspective view of the construction of the lifting sleeve proposed in the present application;
FIG. 10 is a schematic diagram of the structure of the detecting member and its arrangement according to the present application;
FIG. 11 is a schematic view of a cartridge and a detecting member according to the present application;
FIG. 12 is a perspective view of the structure of the detecting member of the present application at the bottom of the cartridge;
FIG. 13 is a schematic diagram showing a state of the detecting pen according to the present application when the detecting pen rotates to detect and overturn the pen for feeding;
fig. 14 is a schematic view showing the internal structure of the test pen according to the present application before and after negative pressure adsorption.
The reference numerals in the figures illustrate:
the device comprises a frame 1, a rotating station 2, a jig 3, an aligning hole 31, a lifting mechanism 4, a lifting support 41, a lifting cylinder 42, a lifting table 43, an aligning pin 431, a overturning table 44, a synchronous toothed belt 441, a detection pen 5, a negative pressure channel 501, a release channel 502, a limit sliding block 503, a pen tube 51, a synchronous gear 52, a rotating joint 53, an electromagnetic ring 54, a tension spring 55, a rotating sleeve 6, a positioning block 61, a conductive contact 611, a sucker 62, a spiral groove 63, a detection piece 7, a positioning groove 71, a notch 72, a lifting sleeve 8, a release opening 81, a reset spring 82, a sealing ring 83, a ball 84, a piston 85, a limit sliding groove 86, a feed cylinder 9, a guide rail 91 and a locking piece 92.
Detailed Description
The embodiments of the present application will be described in detail and fully with reference to the accompanying drawings, and it is intended that all other embodiments of the application, which are apparent to one skilled in the art without the inventive faculty, are included in the scope of the present application.
Examples
The application provides a device for testing the hardness of a solder mask of a PCB (printed circuit board), referring to fig. 1-13, comprising a plurality of jigs 3 which are uniformly distributed on a rotary station 2 at equal angles, wherein the jigs 3 are used for clamping the PCB to be tested, and further comprise a detection pen 5 for detecting the hardness on the solder mask of the PCB, wherein the rotary station 2 is rotationally connected to a frame 1 through a servo motor, one side of the frame 1 is fixedly used for driving the detection pen 5 to be close to a lifting mechanism 4 of the PCB, the output end of the lifting mechanism 4 is fixedly provided with a lifting table 43, and the lifting table 43 is rotationally connected with a turnover table 44;
the detection pens 5 are rotationally connected to the overturning table 44 at equal intervals, the detection pens 5 are synchronously driven to rotate by a servo motor, the bottom ends of the detection pens 5 are adsorbed with detection pieces 7 through air pressure, the detection pieces 7 are of a hemispherical shell-shaped solid structure prepared by mixing graphite and clay, the hardness of the detection pieces 7 on the detection pens 5 is sequentially distributed from small to large, and a feed cylinder 9 for providing the detection pieces 7 for the detection pens 5 is further arranged on one side of the lifting table 43;
the bottom end of the detecting pen 5 is also provided with two groups of conductive contacts 611 which are symmetrically arranged, the conductive contacts 611 are used for judging the electrifying property of the detecting piece 7, the hardness data of the PCB solder mask is fed back through the rotation consumption state of the detecting piece 7, and the number of the detecting pens 5 is not less than three, and the hardness of the detecting pieces 7 on the detecting pens 5 is distributed according to the pencil hardness level 4B & gt3B & gt2B & gtB & gtHB & gtF & gt2H & gt3H & gt4H & gt5H & gt6H.
The detection principle of the detection pen 5 is to drive the detection piece 7 at the bottom to rotate on the surface of the solder mask of the PCB, when the detection piece 7 is smaller than the hardness of the solder mask, the detection piece 7 is consumed by spin grinding until the detection piece breaks, at this time, the conduction effect of the detection piece 7 is lost between two groups of conductive contacts 611 on the detection pen 5, and the detection current is lost, so that the hardness level of the solder mask can be judged, if the detection piece 7 with the hardness of B is consumed, and the detection piece 7 with the hardness of 2B is not consumed, the hardness of the solder mask can be judged to be 2B.
Wherein detect piece 7 design is hemisphere shell form solid structure, runs into the PCB board that hardness is less than it when detecting piece 7, then be difficult for being worn and consumed, utilizes hemisphere shell structure to keep supporting strength, realizes repeatedly usable, runs into when hardness is greater than its PCB board when detecting piece 7, then wear and consume, has destroyed its hemisphere shell structure's stability, guarantees the easy damaged characteristic in single rotatory consumption in-process, promotes the accuracy that detects in proper order.
In fig. 4, the detection pen 5 includes a pen tube 51, a synchronizing gear 52 is fixed at the top of the pen tube 51, a synchronizing toothed belt 441 is sleeved on the outer sides of the synchronizing gears 52, the synchronizing toothed belt 441 is driven by a servo motor, and the plurality of pen tubes 51 can be synchronously driven by the servo motor to synchronously rotate through the meshing action between the synchronizing toothed belt 441 and the synchronizing gear 52 at the top of the pen tube 51, so that the synchronism of detection is improved.
In fig. 2-3, the lifting mechanism 4 comprises a lifting bracket 41, a lifting cylinder 42 is fixed on one side of the lifting bracket 41, an output end of the lifting cylinder 42 is fixed on one side of the top of a lifting table 43, a turnover table 44 is rotatably connected in the lifting table 43 through driving of a stepping motor, an alignment pin 431 is fixed on the bottom of the lifting table 43, and an alignment hole 31 corresponding to the alignment pin 431 is formed in the top of the jig 3.
Through the drive of lift cylinder 42, drive elevating platform 43 and reciprocate, realize detecting pen 5 bottom and PCB board upper surface's contact clearance and adjust, combine the guide action of counterpoint round pin 431 and counterpoint hole 31 simultaneously, can effectively keep elevating platform 43 and tool 3 to make detecting pen 5 in the action of rotatory detection, can not take place the phenomenon of skew shake, promoted detection stability.
In fig. 10-12, two sets of positioning grooves 71 and two sets of openings 72 are symmetrically arranged on the detecting member 7, the axial clamping angle between the symmetrical axes of the two sets of positioning grooves 71 and the symmetrical axes of the two sets of openings 72 is smaller than ninety degrees, the feeding barrel 9 is obliquely downwards arranged, two sets of guide rails 91 matched with the positioning grooves 71 are fixed in the barrel wall of the feeding barrel 9, two sets of locking blocks 92 corresponding to the openings 72 are further arranged at the bottom barrel opening of the feeding barrel 9, when the detecting member 7 is placed on the feeding barrel 9 along the guide rails 91, the concave surface of the shell of the detecting member 7 is downwards arranged, at this time, the symmetrical axes of the two sets of openings 72 on the detecting member 7 and the symmetrical axes of the two sets of locking blocks 92 on the feeding barrel 9 are symmetrically arranged, and the bottommost end of the guide rails 91 is not contacted with the positioning grooves 71 on the detecting member 7 arranged at the bottommost end of the feeding barrel 9.
Through the structural design of the detection piece 7 with the notch 72 and the positioning groove 71 and the feed cylinder 9 with the guide rail 91 and the locking piece 92, the feed cylinder 9 is obliquely downwards arranged, so that the detection piece 7 is conveniently put into the feed cylinder 9 along the guide rail 91 from the top of the feed cylinder 9, and is downwards moved to the bottom of the feed cylinder 9 by utilizing the self gravity of the detection piece 7, the detection piece 7 at the bottom end of the feed cylinder 9 is separated from the guide rail 91, and the purpose of limiting the separation of the detection piece 7 is realized by the dislocation design of the locking piece 92 and the notch 72.
In fig. 4-9, the top of the pen tube 51 is connected with a negative pressure mechanism through a rotary joint 53, a negative pressure channel 501 is arranged in the pen tube 51, a release channel 502 is also symmetrically arranged in the negative pressure channel 501, the negative pressure mechanism provides negative pressure of a designed value for the negative pressure channel 501, a rotary sleeve 6 is rotatably sleeved on the inner side of the bottom of the pen tube 51, a lifting sleeve 8 is sleeved on the inner side of the top of the rotary sleeve 6, a piston 85 matched with the negative pressure channel 501 is fixed on the top of the lifting sleeve 8, a release port 81 corresponding to the release channel 502 is also arranged on the sleeve body of the lifting sleeve 8, a sealing ring 83 is fixed on the outer wall of the lifting sleeve 8 at the bottom of the release port 81, and a reset spring 82 is clamped between the sealing ring 83 and the negative pressure channel 501;
the bottom of the rotating sleeve 6 is fixedly provided with a sucker 62, positioning blocks 61 corresponding to the positioning grooves 71 are symmetrically fixed on the sucker 62, conductive contacts 611 are fixed on one side opposite to the positioning blocks 61, a plurality of spiral grooves 63 which are arranged at equal angles are further arranged in the rotating sleeve 6, balls 84 corresponding to the spiral grooves 63 one by one are fixed on the bottom of the lifting sleeve 8, limiting sliding grooves 86 are symmetrically arranged on the outer wall of the lifting sleeve 8, and limiting sliding blocks 503 matched with the limiting sliding grooves 86 are arranged in the negative pressure channel 501.
In fig. 13 and 14, by designing the detecting pen 5 with the rotating sleeve 6 and the lifting sleeve 8, before detection, the detecting pen 5 is turned to a certain angle under the drive of the turning table 44 in the actual use process, so that the bottom end of the detecting pen 5 is opposite to the output end of the feeding barrel 9, the suction cup 62 is kept to be matched with the concave surface of the detecting piece 7 at the bottom of the feeding barrel 9, at the moment, negative pressure is provided in the negative pressure channel 501 through the rotary joint 53, the lifting sleeve 8 is driven by the negative pressure to overcome the elasticity of the reset spring 82 to move upwards, during the upward movement of the lifting sleeve 8, when the release port 81 is in butt joint with the release channel 502, the negative pressure is transmitted to the suction cup 62, so that the suction cup 62 adsorbs the detecting piece 7, during the continuous upward movement of the lifting sleeve 8, the rotary sleeve 6 is driven by the cooperation of the balls 84 and the spiral grooves 63, so that the detecting piece 7 adsorbed by the suction cup 62 is synchronously rotated, and then the locking piece 92 is matched with the notch 72, so that the detecting piece 7 is separated from the feeding barrel 9, and the feeding action of the detecting pen 5 is completed;
during detection, the detection pen 5 is driven to reset by the overturning table 44, the vertical shape of the detection pen 5 is kept and is in contact with the surface of the solder mask of the PCB to be tested, the detection pen is driven by the synchronous toothed belt 441 to rotate, when the detection piece 7 is smaller than the hardness of the solder mask, the detection pen is consumed by spin grinding until the detection pen breaks, at the moment, the conduction effect of the detection piece 7 is lost between two groups of conductive contacts 611 on the detection pen 5, the detection current is lost, and then the hardness level of the solder mask can be judged, for example, the detection piece 7 with the hardness of B is consumed, the detection piece 7 with the hardness of 2B is not consumed, and then the hardness of the solder mask can be judged to be 2B.
When the detecting piece 7 breaks, the residual piece of the detecting piece 7 is adsorbed by utilizing the negative pressure in the negative pressure channel 501 to move upwards and be collected, so that the surface of the detected PCB has no impurity residue, and the cleanliness of the detecting station is maintained.
Examples
The application provides a device for testing the hardness of a solder mask of a PCB (printed circuit board), referring to FIGS. 1-14, wherein the same or corresponding parts as those in embodiment 1 are denoted by the same reference numerals as those in embodiment 1, and only the differences from embodiment 1 are described below for the sake of simplicity:
in fig. 7, an electromagnetic ring 54 is further fixed in the middle of the outer wall of the pen tube 51, a tension spring 55 is clamped between the electromagnetic ring 54 and the lifting table 43, the electromagnetic ring 54 has magnetic attraction to the lifting table 43 under the condition of power on, the pen tube 51 can perform displacement action in the compression stroke of the tension spring 55 along the up-down direction on the lifting table 43, wherein the inner side of the synchronous toothed belt 441 is meshed with the synchronous gear 52, and the outer side of the synchronous toothed belt 441 is slidingly connected with the overturning table 44 according to the running direction.
According to the application, the pen tube 51 with the electromagnetic ring 54 can realize the hardness detection of the PCB solder mask with the hardness index and the hardness detection of the PCB solder mask without the hardness index, wherein when the PCB with the hardness index is detected, three groups of detection pieces 7 adjacent to the hardness index are selected, if the hardness index of the PCB is B, the corresponding selected detection pieces 7 are three groups of detection pieces 2B, B, HB, the detection pen 5 corresponding to the rest detection pieces 7 is moved up to the maximum stroke through the magnetic attraction of the electromagnetic ring 54, so that the synchronous gear 52 is separated from the synchronous toothed belt 441, the whole-process rotary joint 53 is kept closed, the selected three groups of detection pieces 7 are kept to work, and the detection efficiency and pertinence are improved;
the hardness detection of the PCB solder mask without the hardness index is carried out, the detection piece 7 with each hardness is kept to participate in the measurement in the whole process, the downward force of the tension spring 55 on the electromagnetic ring 54 is utilized in the detection process, the detection piece 7 is fully contacted with the detected PCB, and the detection precision is improved.
The foregoing is merely illustrative of the best modes of carrying out the application in connection with the actual requirements, and the scope of the application is not limited thereto.
Claims (9)
1. The utility model provides a PCB board hinder welding membrane hardness testing arrangement, includes a plurality of equiangular equipartitions and arranges tool (3) on rotatory station (2), tool (3) are used for the centre gripping to wait to detect the PCB board, still include and be used for carrying out hardness detection's detection pen (5) on PCB board hinder welding membrane, a serial communication port, rotatory station (2) are connected on frame (1), fixed elevating system (4) that are used for driving detection pen (5) to be close to the PCB board in frame (1) one side, the output of elevating system (4) is fixed with elevating platform (43), elevating platform (43) rotation is connected with overturning platform (44);
the detection pens (5) are rotationally connected to the overturning table (44) at equal intervals, the detection pens (5) are synchronously driven to rotate by the servo motor, detection pieces (7) are adsorbed at the bottom end of the detection pens (5) through air pressure, the detection pieces (7) are hemispherical shell-shaped solid structures prepared by mixing graphite and clay, the hardness of the detection pieces (7) on the detection pens (5) is sequentially distributed from small to large, and a feed cylinder (9) for providing the detection pieces (7) for the detection pens (5) is further arranged on one side of the lifting table (43);
the bottom of the detection pen (5) is also provided with two groups of conductive contacts (611) which are symmetrically arranged, the conductive contacts (611) are used for judging the electrification property of the detection piece (7), and the hardness data of the PCB solder mask is fed back through the rotation consumption state of the detection piece (7).
2. The device for testing the hardness of the solder mask of the PCB according to claim 1, wherein the number of the detecting pens (5) is not less than three, and the hardness of the detecting pieces (7) on a plurality of the detecting pens (5) is distributed according to pencil hardness grades 4B & gt3B & gt2B & gtB & gtHB & gtF & gtH & gt2H & gt3H & gt4H & gt5H & gt6H.
3. The device for testing the hardness of the solder mask of the PCB according to claim 1, wherein the detection pen (5) comprises a pen tube (51), a synchronous gear (52) is fixed at the top of the pen tube (51), synchronous toothed belts (441) are sleeved on the outer sides of a plurality of the synchronous gears (52), and the synchronous toothed belts (441) are driven by a servo motor.
4. The device for testing the hardness of the solder mask of the PCB according to claim 1, wherein the lifting mechanism (4) comprises a lifting bracket (41), a lifting air cylinder (42) is fixed on one side of the lifting bracket (41), the output end of the lifting air cylinder (42) is fixed on one side of the top of a lifting table (43), and the overturning table (44) is rotationally connected in the lifting table (43) through a stepping motor.
5. The device for testing the hardness of the solder mask of the PCB according to claim 1, wherein an alignment pin (431) is fixed at the bottom of the lifting table (43), and an alignment hole (31) corresponding to the alignment pin (431) is formed at the top of the jig (3).
6. The device for testing the hardness of the solder mask of the PCB according to claim 1, wherein two groups of positioning grooves (71) and two groups of openings (72) are symmetrically arranged on the detecting piece (7), and an axial clamping angle between a symmetrical axis of the two groups of positioning grooves (71) and a symmetrical axis of the two groups of openings (72) is smaller than ninety degrees.
7. The device for testing the hardness of the solder mask of the PCB according to claim 6, wherein the top of the pen tube (51) is connected with a negative pressure mechanism through a rotary joint (53), a negative pressure channel (501) is arranged in the pen tube (51), a release channel (502) is also symmetrically arranged in the negative pressure channel (501), the negative pressure mechanism provides negative pressure of a design value for the negative pressure channel (501), a rotary sleeve (6) is rotatably sleeved at the inner side of the bottom of the pen tube (51), a lifting sleeve (8) is sleeved at the inner side of the top of the rotary sleeve (6), a piston (85) matched with the negative pressure channel (501) is fixed at the top of the lifting sleeve (8), a release port (81) corresponding to the release channel (502) is further arranged on the sleeve body of the lifting sleeve (8), a sealing ring (83) is fixed at the bottom of the release port (81), and a reset spring (82) is clamped between the sealing ring (83) and the negative pressure channel (501);
the bottom of swivel sleeve (6) is fixed with sucking disc (62), the symmetry is fixed with locating piece (61) corresponding with constant head tank (71) on sucking disc (62), conductive contact (611) are fixed in one side opposite to locating piece (61), still be equipped with spiral groove (63) that a plurality of equiangles were arranged in swivel sleeve (6), the bottom of lift cover (8) is fixed with ball (84) corresponding with spiral groove (63) one-to-one, the outer wall of lift cover (8) still symmetry is equipped with spacing spout (86), be equipped with in negative pressure passageway (501) with spacing spout (86) assorted spacing slider (503).
8. The device for testing the hardness of the solder mask of the PCB according to claim 6, wherein the feed cylinder (9) is obliquely arranged downwards, two groups of guide rails (91) matched with the positioning grooves (71) are fixed in the cylinder wall of the feed cylinder (9), two groups of locking blocks (92) corresponding to the openings (72) are further arranged at the bottom cylinder opening of the feed cylinder (9), the detection part (7) is arranged on the feed cylinder (9) along the guide rails (91), the concave surface of the shell of the detection part (7) is arranged downwards, at the moment, the symmetrical axes of the two groups of openings (72) on the detection part (7) are symmetrically arranged with the symmetrical axes of the two groups of locking blocks (92) on the feed cylinder (9), and the bottommost end of the guide rails (91) is not contacted with the positioning grooves (71) arranged on the detection part (7) at the bottommost end of the feed cylinder (9).
9. The device for testing the hardness of the solder mask of the PCB according to claim 1, wherein an electromagnetic ring (54) is further fixed in the middle of the outer wall of the pen tube (51), a tension spring (55) is clamped between the electromagnetic ring (54) and the lifting table (43), the electromagnetic ring (54) has magnetic attraction to the lifting table (43) under the electrifying condition, and the pen tube (51) can perform displacement action in the compression stroke of the tension spring (55) on the lifting table (43) along the up-down direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310912035.1A CN116698641B (en) | 2023-07-25 | 2023-07-25 | Solder mask hardness testing device of PCB |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310912035.1A CN116698641B (en) | 2023-07-25 | 2023-07-25 | Solder mask hardness testing device of PCB |
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| CN116698641A true CN116698641A (en) | 2023-09-05 |
| CN116698641B CN116698641B (en) | 2023-11-07 |
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| US5357786A (en) * | 1993-08-04 | 1994-10-25 | Valence Technology, Inc. | Device for determining mechanical properties of materials |
| EP1531317A1 (en) * | 2003-11-14 | 2005-05-18 | Dr. Schleuniger Pharmatron AG | Method for carrying out thickness and hardness measurements of probes and a rotating plate and a wiping unit associated thereto |
| JP2007139592A (en) * | 2005-11-18 | 2007-06-07 | Saitama Prefecture | Instrument of measuring ultramicro hardness or the like and measuring method |
| CN201269847Y (en) * | 2008-10-21 | 2009-07-08 | 武汉钢铁(集团)公司 | Novel pencil hardness test instrument |
| CN109556979A (en) * | 2017-09-25 | 2019-04-02 | 上海宝钢工业技术服务有限公司 | Coil Coating Products pencil hardness detector and detection method |
| CN209727605U (en) * | 2019-01-30 | 2019-12-03 | 河北省环保产品质量监督检验研究院 | A kind of determination of pencil hardness instrument |
| CN112284950A (en) * | 2020-12-23 | 2021-01-29 | 南京沃智仪器科技有限公司 | Pellet feed hardness detection device |
-
2023
- 2023-07-25 CN CN202310912035.1A patent/CN116698641B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5357786A (en) * | 1993-08-04 | 1994-10-25 | Valence Technology, Inc. | Device for determining mechanical properties of materials |
| EP1531317A1 (en) * | 2003-11-14 | 2005-05-18 | Dr. Schleuniger Pharmatron AG | Method for carrying out thickness and hardness measurements of probes and a rotating plate and a wiping unit associated thereto |
| JP2007139592A (en) * | 2005-11-18 | 2007-06-07 | Saitama Prefecture | Instrument of measuring ultramicro hardness or the like and measuring method |
| CN201269847Y (en) * | 2008-10-21 | 2009-07-08 | 武汉钢铁(集团)公司 | Novel pencil hardness test instrument |
| CN109556979A (en) * | 2017-09-25 | 2019-04-02 | 上海宝钢工业技术服务有限公司 | Coil Coating Products pencil hardness detector and detection method |
| CN209727605U (en) * | 2019-01-30 | 2019-12-03 | 河北省环保产品质量监督检验研究院 | A kind of determination of pencil hardness instrument |
| CN112284950A (en) * | 2020-12-23 | 2021-01-29 | 南京沃智仪器科技有限公司 | Pellet feed hardness detection device |
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| CN116698641B (en) | 2023-11-07 |
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