CN106405381A - Full-automatic four-wire testing machine for circuit board - Google Patents
Full-automatic four-wire testing machine for circuit board Download PDFInfo
- Publication number
- CN106405381A CN106405381A CN201611093163.4A CN201611093163A CN106405381A CN 106405381 A CN106405381 A CN 106405381A CN 201611093163 A CN201611093163 A CN 201611093163A CN 106405381 A CN106405381 A CN 106405381A
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- China
- Prior art keywords
- circuit board
- plate
- wheel
- slide unit
- binding dust
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
- G01R31/2808—Holding, conveying or contacting devices, e.g. test adapters, edge connectors, extender boards
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Framework For Endless Conveyors (AREA)
- Tests Of Electronic Circuits (AREA)
Abstract
The invention provides a full-automatic four-wire testing machine for a circuit board. The testing machine comprises a feeding unit, a testing unit, and a discharging unit. The feeding unit transmits a circuit board from a placing position to a testing position. The testing unit adjusts a pin plate of a testing tool automatically by using a fine tuning device, thereby testing the circuit board precisely. The discharging unit conveys the circuit board after testing completion to a corresponding area according to a testing execution situation. According to the testing machine, the feeding unit can convey laminated circuit boards; the testing unit can carry out alignment fine tuning on the circuit board that does not pass the test and then test the circuit board; and the discharging unit conveys the circuit board after test completion to the corresponding area based on the testing result. High-efficiency inputting and classified outputting as well as accurate alignment and testing are realized. Therefore, the testing efficiency and yield of the circuit boards are improved; the cost is lowered; and resource wasting is reduced.
Description
Technical field
The present invention relates to the test device field of circuit board, particularly to a kind of fully automatic circuit board four line test machine.
Background technology
Complication with electronic product function and the miniaturization of electronic product, the contact distance of integrated circuit elements with
Reduce, the encapsulation of mobile electron motherboard is increasingly intensive, the requirement more and more higher to carrier HDI (high density interconnection) circuit board,
The distance between centers of tracks density of circuit board is more and more closeer, there has also been higher requirement to the Wiring technique of circuit board.
Existing HDI circuit board is holed through multiple, and figure shifts, and pressing plate baking, inevitably occur with original
The deviation of design configuration, and traditional test equipment is all the measurement jig using fixed bit, its testing needle can not be according to deviation
Situation is adjusted, thus occurring reporting by mistake, leading to test yield and declines, and in process of production on circuit board inevitably
Have some dusts, this also will impact circuit board test yield decline, this all causes the waste of resource, and in fact,
Deviation occurs or has on the circuit board of dust, electrical property does not have any problem, is allowed within the specific limits.
Therefore need to provide a kind of fully automatic circuit board four line test machine to solve above-mentioned technical problem.
Content of the invention
The present invention provides a kind of fully automatic circuit board four line test machine, to solve circuit board detection equipment in prior art
The low problem of testing efficiency is low and impact of due to deviation or dust causes test yield.
For solving above-mentioned technical problem, present disclosure is：A kind of fully automatic circuit board four line test machine, it include into
Material unit, test cell and discharging unit.
Wherein feed unit includes rolling wheel input device, the first lowering or hoisting gear, enters wrench arm, belt conveyor and remove
Dirt device；
Circuit board is delivered on described first lowering or hoisting gear wherein said rolling wheel input device, described first lowering or hoisting gear
Circuit board is ramped up after delivering to a setting height, described enter wrench arm draw circuit board again and deliver to described belt conveyor
On, circuit board can be through described dust arrester, with to the ash on circuit board during conveying on described belt conveyor
Trifle in the world matter is purged, finally again by described enter wrench arm the circuit board after dedusting is sent to the test of described test cell
Position.
Described rolling wheel input device includes the multiple rollers be arrangeding in parallel, and the two ends of each described roller are all connected with synchronization
Wheel, described synchronizing wheel connects the first drivewheel by Timing Belt and is driven.
In addition, described rolling wheel input device also includes multiple directive wheels, described directive wheel is located at two described synchronizing wheels even
On the perpendicular bisector of line, and multiple described directive wheel is respectively positioned on the same side of described synchronizing wheel, and described Timing Belt passes through winding
Directive wheel, to increase the cornerite to described synchronizing wheel for the described Timing Belt, can improve transmission between described Timing Belt and described synchronizing wheel
Stability.
Described enter wrench arm be driven by secondary conveyor, described secondary conveyor includes：
Fixing base plate, is fixedly installed motor on described fixing base plate；
Driving wheel, for generating driving force by described motor；
First transmission module, for being transferred to described intermediate plate by the driving force of described driving wheel；
Described intermediate plate, for moving to direction initialization under the driving force effect of described driving wheel；
Second transmission module, is arranged on described intermediate plate, for the driving force of described intermediate plate is transferred to delivery board；
Described delivery board；It is arranged on described intermediate plate, in the presence of the driving force of described intermediate plate, with respect to institute
State intermediate plate to move to described direction initialization；
Wherein, described first transmission module includes being fixed on described intermediate plate, and the centre being connected with described driving wheel
Plate drive belt, described intermediate plate drive belt drives described intermediate plate to move under the driving of described driving wheel, so that in described
Between plate move to described direction initialization；
Described second transmission module includes two driven pulleys being fixed on described intermediate plate and is arranged on described in two
Delivery board drive belt on driven pulley；Described delivery board drive belt side is fixedly connected with described fixing base plate, described delivery board
Drive belt opposite side is fixedly connected with described delivery board, the drive of the driving force in described intermediate plate for the described delivery board drive belt
Down so that delivery board moves to described direction initialization relative to described intermediate plate；
Described intermediate plate can be moved to described direction initialization on described fixing base plate by the first slide rail, described delivery board
Can be moved to described direction initialization on described intermediate plate by the second slide rail.
When described driving wheel rotates, described intermediate plate drive belt drives described intermediate plate to move with respect to described fixing base plate
Dynamic, simultaneously as the movement of described intermediate plate, just make described delivery board drive belt drive described delivery board with respect in described
Between plate move, when motor speed under identical circumstances, it is possible to achieve than single-stage conveying transporting velocity fast again.
Described enter wrench arm also include Acetabula device, described Acetabula device is by outer tube, expansion link, the first spring and sucker group
Become；
Described expansion link is hollow expansion link, and described expansion link is arranged in described outer tube, and one end of described expansion link is prolonged
Stretch outside described outer tube and be connected with described sucker, the diapire of the other end of described expansion link and described outer barrel forms the
Two chambers, the lateral wall of described expansion link forms first chamber with the medial wall of described outer tube, and described first chamber is true with outside
Empty generator connects, and described second chamber is connected with ambient atmosphere by described expansion link, described first chamber and described second
Chamber passes through pore and is connected；
Described first spring is located in described first chamber, and described first spring housing is on described expansion link, described flexible
Bar is provided with the first limiting plate for limiting described first spring, the inside of described outer tube near one end of described second chamber
It is provided with the second limiting plate for limiting described first spring.
The expansion link of described Acetabula device can carry out the flexible of vertical direction, and draws circuit board, so allows for into plate
Arm is no longer necessary to unnecessary device to control the vertical movement of whole Acetabula device.
It is provided with first liter for transporting circuit board between described rolling wheel input device and described belt conveyor
Falling unit, described first lowering or hoisting gear includes first conveyer belt, for receiving the input flat board being loaded with circuit board under test；
It is additionally provided with anticollision mechanism in described belt conveyor near the side of described first lowering or hoisting gear, described anticollision
Along the lifting direction setting of described first lowering or hoisting gear, described anticollision mechanism is by anticollison block, second spring, jump ring, sense for mechanism
Answer device and baffle plate composition；
Described anticollison block is located at the bottom of described baffle plate, and described induction apparatuss are arranged on the side of described baffle plate, described sensing
Device controls the lifting of described first lowering or hoisting gear, and described anticollison block is connected with described second spring by described jump ring, and in institute
State under the elastic force effect of second spring, described anticollison block is not contacted with described induction apparatuss, when described anticollison block touches described sense
Answer device, described first lowering or hoisting gear can stop ascending motion；
In described baffle plate, the side of circuit board is provided with oblique angle, is beneficial to and described first lowering or hoisting gear conveying is come
Circuit board guide, prevent its sideslip in motor process.
Described dust arrester is combined with described belt conveyor so that described dust arrester can fill to described Belt Conveying
The circuit board put carries out dedusting, and described dust arrester is made up of support, upper and lower two binding dust wheels and upper and lower two binding dust paper rolls,
Described upper binding dust wheel, described lower binding dust wheel, described upper binding dust paper roll and described lower binding dust paper roll all be arranged in parallel, described upper binding dust
Paper roll is located on described upper binding dust wheel, and described lower binding dust paper roll is located under described lower binding dust wheel；
The rotary shaft of described lower binding dust wheel is fixedly connected with described support by bearing, and the rotary shaft of described upper binding dust wheel is led to
Cross bearing to be flexibly connected with described support so that the distance between described upper binding dust wheel and described lower binding dust wheel are freely adjustable；
The rotary shaft of described upper binding dust paper roll is flexibly connected with described support so that upper binding dust paper roll is in gravity by bearing
In the presence of keep contact with described upper binding dust wheel all the time, the rotary shaft of described lower binding dust paper roll passes through bearing and described support work
It is dynamically connected, and the bottom of the rotary shaft of described lower binding dust paper roll is connected with described rack elasticity by the 3rd spring so that lower glue
Remain between dirt paper roll and lower binding dust wheel and contact.
Test cell is used for carrying out whether qualified test to circuit board, and it includes support, central processing unit, CCD sensing
Device, micromatic setting and measurement jig；
Wherein, described central processing unit and described ccd sensor, described micromatic setting are electrically connected with；
Described micromatic setting includes finely tuning slide unit and tuning plate, and described measurement jig includes needle plate and jig plate, described micro-
The one side of tuned plate is connected with described fine setting slide unit, and the another side of described tuning plate is connected with described needle plate, described jig plate and institute
State support to connect, described fine setting slide unit passes through leading screw and feed screw nut and motor connection, is driven.
In the present invention, described ccd sensor includes upper and lower two ccd sensors, and described micromatic setting includes upper and lower
Micromatic setting, described measurement jig includes upper and lower measurement jig, is tested with the upper and lower surface to circuit board simultaneously；
Described test cell also includes the lower mould elevating mechanism of the lifting for controlling lower micromatic setting and lower measurement jig,
Described lower mould elevating mechanism is by base plate, splined shaft, accessory plate, the second drivewheel, driven pulley, leading screw, feed screw nut, lifter plate group
Become；
Described lower mould elevating mechanism includes many splined shafts, and one end of described splined shaft is fixedly connected with described lifter plate,
Being slidably connected with described base plate laterally through linear bearing of splined shaft, the other end of described splined shaft is fixed with described accessory plate
Connect, can select to be fixedly connected the other end of all or part of splined shaft with described accessory plate according to practical situation；
Feed screw nut is connected with described base plate by swivel bearing, and leading screw is matched with feed screw nut, one end of leading screw with
Described lifter plate is fixedly connected, and the other end of leading screw fixes downlink connection with described accessory plate, described second drivewheel by with institute
State driven pulley to be driven, and then drive feed screw nut to rotate；
Described lower micromatic setting is arranged on described lifter plate, and described upper micromatic setting is connected with described support.
Wherein, the bottom of described micromatic setting is provided with substrate, and described fine setting slide unit includes the first slide unit and the second slide unit,
Described first slide unit arrange on the substrate, described second slide unit is arranged on described first slide unit, described first slide unit and
The glide direction of described second slide unit is orthogonal, and the slip plane of described first slide unit and described second slide unit is parallel to each other,
Described micromatic setting at least includes two described fine setting slide units；
All by feed screw nut and leading screw and motor connection, motor arranges on the substrate each described fine setting slide unit,
The side of one of glide direction in corresponding described fine setting slide unit for each motor connection, and the transmission direction of two motors
Orthogonal；
The tuning plate of described lower micromatic setting is connected with the needle plate of described lower measurement jig, the fine setting of described upper micromatic setting
Plate is connected with the needle plate of described upper measurement jig.
Described fine setting slide unit also include connected unit, described connected unit by a rotary shaft be connected to described second slide unit it
On, described tuning plate is fixedly connected with described fine setting slide unit by described connected unit.
Discharging unit is according to test by whether the circuit board being completed being delivered to corresponding region, described region
Including test passes area and test failure area, it is defeated that described discharging unit includes ejecting plate arm, the second lowering or hoisting gear and roller
Go out device.
Wherein, described ejecting plate arm and described enter wrench arm, described roller output device and described rolling wheel input device
Structure is similar to, therefore no longer carries out detailed statement to it.
Described second lowering or hoisting gear includes the second conveyer belt, is provided with output flat board on described second conveyer belt, described
Test passes area and test failure area are located on different described output flat boards, after circuit board is piled, described second lifting
Device declines automatically, by the second conveyer belt, the output flat board being loaded with slowdown monitoring circuit plate is delivered to described roller output device,
Finally sent by roller output device.
The present invention compared to prior art, its advantage is：The entering of the fully automatic circuit board four line test machine of the present invention
Material unit can convey whole folded circuit board, then treats that location is tested by entering wrench arm delivering to one by one, and test cell energy
The circuit board not passing through to test is carried out by para-position is automatically finely tuned and tested, discharging unit is according to test result by the electricity being completed
Road plate is delivered to corresponding region, efficient input and classification output and accurate para-position test, substantially increase circuit
The efficiency of board test and yield, reduce cost simultaneously, decrease the waste of resource.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below to required in embodiment
Accompanying drawing to be used is briefly described, and drawings in the following description are only the corresponding accompanying drawing of section Example of the present invention.
Fig. 1 is the structural representation of the fully automatic circuit board four line test machine of the present invention.
Fig. 2 is the structural representation of the feed unit of fully automatic circuit board four line test machine of the present invention.
Fig. 3 is the structural representation of the rolling wheel input device of fully automatic circuit board four line test machine of the present invention.
Fig. 4 is the sectional view in the left view direction of rolling wheel input device in Fig. 3.
Fig. 5 is the front view of the secondary conveyor entering wrench arm of fully automatic circuit board four line test machine of the present invention.
Fig. 6 is the top view of the secondary conveyor entering wrench arm in Fig. 5.
Fig. 7 is the sectional view of the Acetabula device entering wrench arm of fully automatic circuit board four line test machine of the present invention.
Fig. 8 is the structural representation of the belt conveyor of fully automatic circuit board four line test machine of the present invention.
Fig. 9 is the structural representation of the anticollision mechanism of fully automatic circuit board four line test machine of the present invention.
Figure 10 is the structural representation of the dust arrester of fully automatic circuit board four line test machine of the present invention.
Figure 11 is the structural representation of the lower mould elevating mechanism of fully automatic circuit board four line test machine of the present invention.
Figure 12 is the combination of the card case, measurement jig and micromatic setting of fully automatic circuit board four line test machine of the present invention
Structural representation.
Figure 13 is the structural representation of the micromatic setting of fully automatic circuit board four line test machine of the present invention.
Figure 14 is the structural representation of the measurement jig of fully automatic circuit board four line test machine of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, the every other enforcement that those skilled in the art are obtained under the premise of not making creative work
Example, broadly falls into the scope of protection of the invention.
Traditional circuit board detection equipment is all the measurement jig using fixed bit, and its testing needle can not be according to deviation situation
It is adjusted, thus occurring reporting by mistake, leading to test yield and decline, and inevitably have on circuit board in process of production
Some dusts, the test yield of impact circuit board is also declined by this, and in fact, deviation or the circuit board having dust are occurring
On, electrical property does not have any problem, is allowed within the specific limits, therefore this also result in the waste of resource.
The following is a kind of the excellent of fully automatic circuit board four line test machine that can solve above technical problem that the present invention provides
Select embodiment.
Refer to Fig. 1, wherein Fig. 1 is the structural representation of the fully automatic circuit board four line test machine of the present invention.
In in figure, the similar unit of structure is to be represented with identical label.
The preferred embodiment of fully automatic circuit board four line test machine that the present invention provides is：A kind of fully automatic circuit board four line
Test machine, it includes feed unit 1, test cell 2 and discharging unit 3.
Refer to Fig. 2, wherein Fig. 2 is the structural representation of the feed unit of fully automatic circuit board four line test machine of the present invention
Figure.
Feed unit 1 includes rolling wheel input device 11, the first lowering or hoisting gear 12, enters wrench arm 13, belt conveyor 14
And dust arrester 15；
Wherein circuit board is delivered on the first lowering or hoisting gear 12 rolling wheel input device 11, and the first lowering or hoisting gear 12 is by circuit
Plate ramps up after delivering to a setting height, enters wrench arm 13 and draws circuit board again and deliver on belt conveyor 14, circuit board
Can be through dust arrester 15, to carry out clearly to the dust impurity on circuit board during belt conveyor 14 conveys
Remove, finally again by the test position entering wrench arm 13 and be sent to the circuit board after dedusting test cell 2.
Refer to Fig. 3 and Fig. 4, wherein Fig. 3 is the rolling wheel input device of the fully automatic circuit board four line test machine of the present invention
Structural representation, Fig. 4 be Fig. 3 in the left view direction of rolling wheel input device sectional view.
Rolling wheel input device 11 includes the multiple rollers 111 be arrangeding in parallel, and the two ends of each roller 111 are all connected with synchronization
Wheel 114, synchronizing wheel 114 connects the first drivewheel 112 by Timing Belt 113 and is driven.
In addition, roller 111 input equipment also includes multiple directive wheels 115, directive wheel 115 is located at two synchronizing wheels 114 even
On the perpendicular bisector of line, and multiple directive wheel 115 is respectively positioned on the same side of synchronizing wheel 114, and Timing Belt 113 is guided by winding
Wheel 115, to increase the cornerite to synchronizing wheel 114 for the Timing Belt, can guarantee that the friction between Timing Belt 113 and each synchronizing wheel 114
Wheel, it is ensured that each roller 111 is driven, improves Timing Belt 113 further and drives the stability of roller 111 transmission so that roller
More stable for circuit board can be delivered on the first lowering or hoisting gear 12 for input equipment 11.
Refer to Fig. 5 and Fig. 6, wherein Fig. 5 enters the two of wrench arm for the fully automatic circuit board four line test machine of the present invention
The front view of level conveying mechanism, Fig. 6 is the top view of the secondary conveyor entering wrench arm in Fig. 5.
Enter wrench arm 13 to be driven by secondary conveyor 131, secondary conveyor 131 is mainly by fixing base plate
1311st, intermediate plate 1312, delivery board 1313, driving wheel 1314, driven pulley 1316, intermediate plate drive belt 1315a, delivery board drive
The compositions such as band 1315b；
Wherein, driving wheel 1314 is connected in the rotary shaft of motor, and motor is fixing with fixing base plate 1311
Connect, the two ends of intermediate plate drive belt 1315a are fixed on the two ends of intermediate plate 1312 by fixed block 1319c, and intermediate plate drives
Dynamic band 1315a bypasses pulley 1317 and is connected on driving wheel 1314, and motor passes through to drive driving wheel 1314, drives intermediate plate
Drive belt 1315a is moved relative to motor；
Two driven pulleys 1316 are arranged on the two ends of intermediate plate 1312, delivery board drive belt 1315b for ring type close same
Step band, delivery board drive belt 1315b is wound on two driven pulleys 1316, and fixed block is passed through in delivery board drive belt 1315b side
1319b is connected with fixing base plate 1311, and the opposite side of delivery board drive belt 1315b passes through fixed block 1319a and delivery board 1313
It is connected；
Intermediate plate 1312 can be slided on fixing base plate 1311 by the first slide rail 1318a, and delivery board 1313 can be by the
Two slide rail 1318b slide on intermediate plate 1312.
Because motor is fixedly connected with fixing base plate 1311, when driving wheel 1314 rotates, intermediate plate drive belt
1315a can be driven along the rotation direction of driving wheel 1314, and the two ends of intermediate plate drive belt 1315a with intermediate plate 1312 are
It is fixedly connected, and intermediate plate 1312 can be slided by the first slide rail 1318a on fixing base plate 1311, so, driving wheel
1314 can control intermediate plate 1312 along the first slide rail 1318a with respect to fixing base plate 1311 by intermediate plate drive belt 1315a
Move to direction initialization；
In addition, when intermediate plate 1312 moves along the first slide rail 1318a, simultaneously can be with being fixedly installed on intermediate plate 1312
Driven pulley 1316 and delivery board drive belt 1315b move together, and due to delivery board drive belt 1315b side pass through fix
Block 1319b is connected with fixing base plate 1311, so in the presence of intermediate plate 1312 is to the driving force of direction initialization movement, conveying
Plate drive belt 1315b can rotate around driven pulley 1316, and the opposite side of delivery board drive belt 1315b passes through fixed block 1319a
It is connected with delivery board 1313, delivery board drive belt 1315b rotates around driven pulley 1316 and will drive delivery board 1313 along second
Slide rail 1318b is mobile with respect to intermediate plate 1312；
In the case of motor rotating speed identical, such secondary conveyor 131 can make the motion into wrench arm 13
Speed conveys fast again than single-stage.
Refer to Fig. 7, wherein Fig. 7 is the Acetabula device entering wrench arm of the fully automatic circuit board four line test machine of the present invention
Sectional view.
Enter wrench arm 13 and also include Acetabula device 132, Acetabula device 132 is mainly by outer tube 1321, expansion link 1324, first
Spring 1325 and sucker 1326 form；
Expansion link 1324 is hollow expansion link, and expansion link 1324 is arranged in outer tube 1321, and one end of expansion link 1324 is prolonged
Stretch outside outer tube 1321 and be connected with sucker 1326, the other end of expansion link 1324 and the diapire formation the outer tube 1321 within
Two chambers 1323, the lateral wall of expansion link 1324 forms first chamber 1322, first chamber 1322 with the medial wall of outer tube 1321
Be connected with external vacuum generator, second chamber 1323 is connected with ambient atmosphere by expansion link 1324, first chamber 1322 with
Second chamber 1323 is passed through pore and is connected；
First spring 1325 is located in first chamber 1322, and the first spring 1325 is enclosed within expansion link 1324, expansion link
1324 are provided with the first limiting plate for limiting the first spring 1325 near one end of second chamber 1323, outer tube 1321 interior
Portion is provided with the second limiting plate for limiting the first spring 1325.
When the vacuum of first chamber 1322 reaches some strength, in first chamber 1322, pressure is less, and the second chamber
Room 1323 and atmosphere, its air pressure is bigger than first chamber 1322, thus forming pressure reduction, so that expansion link 1324 is stretched out, working as sucker
1326 when touching circuit board, second chamber 1323 i.e. and isolated from atmosphere, by first chamber 1322 and second chamber 1323 it
Between thin seam, first chamber 1322 is identical with the air pressure of second chamber 1323, expansion link in the presence of the first spring 1325
1324 retractions.
The expansion link 1324 of Acetabula device 132 can carry out the flexible of vertical direction, and draws circuit board, so allow for into
Wrench arm 13 is no longer necessary to unnecessary device to control the vertical movement of whole Acetabula device 132.
Refer to Fig. 8 and Fig. 9, wherein Fig. 8 is the belt conveyor of the fully automatic circuit board four line test machine of the present invention
Structural representation, Fig. 9 be the present invention the anticollision mechanism of fully automatic circuit board four line test machine structural representation.
It is provided with the first lifting dress for transporting circuit board between rolling wheel input device 11 and belt conveyor 14
Put 12, the first lowering or hoisting gear 12 includes first conveyer belt, it is used for receiving the input flat board being loaded with circuit board under test, the first lifting
The lifting of device 12, by induction apparatuss control, can make the circuit board under test of top be maintained at certain horizontal level, be beneficial to into
The absorption of wrench arm 13.
Belt conveyor 14 carrys out adjustment width using left-right turning screw rod 141, with the more preferable belt conveyor ensureing both sides
Keep the consistent of width when adjusting.
It is additionally provided with anticollision mechanism 142, anticollision mechanism in belt conveyor 14 near the side of the first lowering or hoisting gear 12
Along the lifting direction setting of the first lowering or hoisting gear 12, anticollision mechanism 142 is by anticollison block 1423, second spring 1425, jump ring
1424th, induction apparatuss 1422 and baffle plate 1421 form；
Anticollison block 1423 is located at the bottom of baffle plate 1421, and anticollison block 1423 passes through jump ring 1424 and second spring 1425 phase
Even, and under the elastic force of second spring 1425 acts on, anticollison block 1423 is not contacted with induction apparatuss 1422, when the first lowering or hoisting gear 12
On circuit board when bumping against anticollison block 1423, anticollison block 1423 can be made to touch induction apparatuss 1422, and then make the first lifting dress
Put 12 and can stop ascending motion.
In baffle plate 1421, the side of circuit board is provided with oblique angle 1426, is beneficial to and the first lowering or hoisting gear 12 is ramped up
The circuit board sending guides, and the circuit board that have certain off normal can be corrected, and can prevent its sideslip in motor process again.
Refer to Figure 10, wherein Figure 10 is that the structure of the dust arrester of fully automatic circuit board four line test machine of the present invention is shown
It is intended to.
Dust arrester 15 combines with belt conveyor 14 so that dust arrester 15 can be to the electricity on belt conveyor 14
Road plate carries out dedusting, and dust arrester 15 is made up of support 151, upper and lower two binding dust wheels and upper and lower two binding dust paper rolls, upper binding dust
Wheel 152, lower binding dust wheel 153, upper binding dust paper roll 154 and lower binding dust paper roll 155 all be arranged in parallel, and upper binding dust paper roll 154 is located at upper
On binding dust wheel 152, lower binding dust paper roll 155 is located under lower binding dust wheel 153；
The rotary shaft of lower binding dust wheel 153 is fixedly connected with support 151 by bearing, and the rotary shaft of upper binding dust wheel 152 is passed through
Bearing is flexibly connected with support 151 so that the distance between upper binding dust wheel 152 and lower binding dust wheel 153 are freely adjustable；
The rotary shaft of upper binding dust paper roll 154 is flexibly connected with support 151 by bearing so that upper binding dust paper roll 154 is in weight
All the time keep contacting with upper binding dust wheel 152 in the presence of power, the rotary shaft of lower binding dust paper roll 155 is passed through bearing and lived with support 151
It is dynamically connected, and the 3rd spring 156 is passed through with support 151 elastic connection so that lower glue in the bottom of the rotary shaft of lower binding dust paper roll 155
Remain between dirt paper roll 155 and lower binding dust wheel 153 and contact.
Dust arrester 15 so can be made to carry out more effective dust removal process to the circuit board of conveying on belt conveyor 14.
Refer to Figure 12, Figure 13 and Figure 14, wherein Figure 12 be the present invention the card case of fully automatic circuit board four line test machine,
Measurement jig and the combining structure schematic diagram of micromatic setting, Figure 13 is the micro- of the fully automatic circuit board four line test machine of the present invention
Adjust the structural representation of device, Figure 14 is the structural representation of the measurement jig of fully automatic circuit board four line test machine of the present invention
Figure.
Test cell 2 is used for carrying out whether qualified test to circuit board, and it includes support, central processing unit, CCD sensing
Device, micromatic setting 22 and measurement jig 23；
Wherein, central processing unit and ccd sensor, micromatic setting 22 are electrically connected with；
Micromatic setting 22 includes finely tuning slide unit, and fine setting slide unit passes through leading screw 224 and feed screw nut 223 is connected with motor 225,
It is driven；
The bottom of micromatic setting 22 is provided with substrate 221, fine setting slide unit include connected unit 222a, the first slide unit 222b and
Second slide unit 222c, connected unit 222a is connected on the second slide unit 222c by a rotary shaft, and connected unit 222a can be passed through
Rotary shaft is freely rotatable on the second slide unit 222c, and the first slide unit 222b is fixedly connected with feed screw nut 223.
First slide unit 222b is arranged on substrate 221, is slided by default guide rail between the first slide unit 222b and substrate 221
It is dynamically connected, the second slide unit 222c is arranged on the first slide unit 222b, also by pre- between the second slide unit 222c and the first slide unit
If slide connect.
Measurement jig 23 includes needle plate 231 and jig plate 232, and micromatic setting 22 also includes tuning plate 226, tuning plate 226
One side be connected with connected unit 222a, the another side of tuning plate 226 is connected with needle plate 231, jig plate 232 pass through extension block 2322
It is connected with support.
Control corresponding fine setting slide unit to enter line slip respectively by motor, and then drive needle plate 231 to enter by tuning plate 226
Row fine setting, circuit board under test is then located on jig plate 232, and simultaneously because jig plate 232 is fixedly connected with support and keeps not
Dynamic, so can be achieved with the fine setting of testing needle and the relative position of test point on circuit board.
In addition, measurement jig also includes the chuck 2321 for fixing circuit board under test, chuck 2321 passes through needle plate 231,
The aperture of the through hole simultaneously passing through for chuck 2321 on needle plate 231 is more than the diameter of axle of chuck 2321, is beneficial to the micro- of needle plate 231
Adjust.
Wherein, micromatic setting 22 at least includes two fine setting slide units, two fine setting slide units each include two orthogonal
Glide direction, that is, the glide direction of the first slide unit 222b and the second slide unit 222c is orthogonal, and this two fine setting slide units
Two glide directions are identical；
Each fine setting slide unit all by feed screw nut and leading screw and motor connection, slide in corresponding fine setting by each motor connection
The side of the glide direction of one of slide unit of platform, and the transmission direction of two motors is orthogonal, that is, pass through this two electricity
Machine is controlling fine setting in two mutually perpendicular directions for the micromatic setting 22.
In the preferred embodiment, substrate 221 is rectangle, is provided with a fine setting slide unit on the corner of substrate 221,
And in four fine setting slide units, the transmission direction of the motor that two fine setting slide unit correspondences on diagonal are connected to is identical, different right
The transmission direction of the motor that the fine setting slide unit correspondence on linea angulata is connected to is then orthogonal.
Meanwhile, each finely tunes the first slide unit 222b of slide unit all by feed screw nut and leading screw and corresponding motor connection,
And motor is fixedly installed on substrate 221, the fine setting slide unit of four positions can form and smoothly support very much and fine tuning structure.
In the present invention, ccd sensor includes upper and lower two ccd sensors, and micromatic setting includes upper and lower micromatic setting,
Measurement jig includes upper and lower measurement jig, is tested with the upper and lower surface to circuit board simultaneously；
The electronic component of measurement jig is arranged in card case, and card case includes upper and lower card case.
The tuning plate of lower micromatic setting is connected with the needle plate of lower measurement jig, and the tuning plate of upper micromatic setting is controlled with upper test
The needle plate of tool is connected.
Refer to Figure 11, wherein Figure 11 is the knot of the lower mould elevating mechanism of fully automatic circuit board four line test machine of the present invention
Structure schematic diagram.
Test cell 2 also includes the lower mould elevating mechanism of the lifting for controlling lower micromatic setting and lower measurement jig, under
Mould elevating mechanism is by base plate 211, splined shaft 217, accessory plate 218, the second drivewheel 213, driven pulley 214, leading screw 216, leading screw
Nut 215, lifter plate 212 form；
Lower mould elevating mechanism includes many splined shafts 217, and one end of splined shaft 217 is fixedly connected with lifter plate 212, spline
Being slidably connected with base plate 211 laterally through linear bearing of axle 217, the other end of splined shaft 217 is fixing with accessory plate 218 even
Connect, wherein it is possible to select all splined shafts to be all connected with accessory plate according to practical situation or part splined shaft is connected to assist
Plate, connects accessory plate and can improve the stability that splined shaft guides to monoblock lifter plate 212；
Feed screw nut 215 is connected with base plate 211 by swivel bearing, and leading screw 216 is matched with feed screw nut 215, leading screw
216 one end is fixedly connected with lifter plate 212, and the other end of leading screw 216 fixes downlink connection, the second drivewheel with accessory plate 218
213 by being driven with driven pulley 214, and then drives feed screw nut 215 to rotate；
Lower micromatic setting is arranged on lifter plate 212, and upper micromatic setting is connected with support.
The corresponding electronic component of upper measurement jig is arranged in card case, and the corresponding electronic component of lower measurement jig is arranged on
In lower card case 24, wherein, lower card case 24 is promoted by cylinder and follows lifter plate 212 and move.
Discharging unit 3 according to test by whether the circuit board being completed being delivered to corresponding region, wrap by region
Include test passes area and test failure area, discharging unit 3 includes ejecting plate arm, the second lowering or hoisting gear and roller output dress
Put.
Wherein, ejecting plate arm is similar with the structure entering wrench arm 13, the knot of roller output device and rolling wheel input device 11
Structure is similar to, therefore no longer carries out detailed statement to it.
Second lowering or hoisting gear includes the second conveyer belt, is provided with output flat board on the second conveyer belt, test passes area and
Test failure area is located on different output flat boards, and after circuit board is piled, the second lowering or hoisting gear declines automatically, and by the
The output flat board being loaded with slowdown monitoring circuit plate is delivered to roller output device by two conveyer belts, is finally sent by roller output device.
The present invention fully automatic circuit board four line test machine work step be：First will be neat for a folded circuit board under test
It is placed on input flat board, then the input flat board being loaded with circuit board under test is positioned on roller conveying device, roller conveying dress
Put and by roller 111, the input flat board being loaded with circuit board under test is transported on the first lowering or hoisting gear 12.
Whole folded circuit board is ramped up by the first lowering or hoisting gear 12, wherein, is provided with multiple anti-collision machines around rising passway
Structure, if the inclined too severe anticollison block 1423 that will encounter anticollision mechanism of circuit board, can make anticollison block 1423 touch sensing
Device 1422, and then make the first lowering or hoisting gear 12 can stop ascending motion；
In addition anticollision mechanism also includes baffle plate 1421, and baffle plate 1421 is provided with oblique angle 1426 towards the side of circuit board, this
Sample can be corrected to the circuit board having certain off normal, can prevent circuit board sideslip in motor process again.
When circuit board rises to certain altitude, have induction apparatuss and sense and control the first lowering or hoisting gear 12 to stop rising,
And can control always so that the circuit board under test of top is maintained at certain horizontal level, it is beneficial to the suction into wrench arm 13
Take.
When circuit board rises to the height of setting and stops, the Acetabula device 132 entering wrench arm 13 is sent out by controlling vacuum
The gas of first chamber 1322 drawn by raw device, and when the vacuum of first chamber 1322 reaches some strength, expansion link 1324 is stretched
Go out, sucker 1326 contacts circuit board, be connected due to passing through thin seam between first chamber 1322 and second chamber 1323, sucker 1326
Circuit board can be held, simultaneous retractable bar 1324 is retracted.
In addition, after inputting the circuit board under test on flat board and all entered wrench arm 13 and conveyed, the first lowering or hoisting gear 12 to
Lower landing, and deliver to inputting flat board on rolling wheel input device 11 and send by first conveyer belt, treat for placing again
Slowdown monitoring circuit plate.
Motor drive driving wheel 1314 rotates, and intermediate plate drive belt 1315a drives intermediate plate 1312 to move, and delivery board drives
Band 1315b drives delivery board 1313 to move, and the Acetabula device 132 that suction is had circuit board delivers to the belt of belt conveyor 14
On.
Circuit board can pass through during moving on belt between the upper and lower binding dust wheel of dust arrester 15, is removed
Dirt is processed, and wherein, the rotary shaft of upper binding dust wheel 152 is flexibly connected with support 151 by bearing, when circuit board passes through, circuit board
Upper and lower surface can have close contact so that circuit board obtains effective dust removal process with upper and lower binding dust wheel, simultaneously upper and lower viscous
Dust impurity on dirt wheel can be walked by the winding of upper and lower dust sticky paper again respectively.
Then, enter wrench arm 13 and the circuit board through dust removal process is delivered to test cell 2 again, and be put into measurement jig
On chuck 2321, the second drivewheel 213 of lower mould elevating mechanism is by being driven with driven pulley 214, and then drives feed screw nut 215
Rotate so that leading screw 216 drives lifter plate 212 to rise.
When the needle plate of upper and lower measurement jig test point corresponding with circuit board connects the test carrying out circuit board；
Obstructed out-of-date when testing, lifter plate 212 resets, and upper and lower ccd sensor clicks through to the identification of circuit board upper and lower surface
Row is taken pictures, and by data feedback to central processing unit, central processing unit controls in upper and lower micromatic setting according to the data of feedback
Motor fine setting slide unit is driven, and then corresponding tuning plate 226 is finely adjusted, and also just drives corresponding pin simultaneously
Plate 231 is finely adjusted.
Wherein, when two motors on only one diagonal carry out unidirectional fine setting to fine setting slide unit, another
Fine setting slide unit on bar diagonal then pass through the second slide unit 222c and the first slide unit 222b be slidably matched carry out corresponding move,
Tuning plate 226 is made to be finely tuned in the transmission direction of two motors；
When controlling the motor on two different diagonal that fine setting slide unit is finely adjusted simultaneously, and the electricity on same diagonal
When the transmission direction of machine is identical, tuning plate 226 can be made to obtain the oblique fine setting of certain angle；
When controlling the motor on two different diagonal that fine setting slide unit is finely adjusted simultaneously, and the electricity on same diagonal
When the transmission direction of machine differs, tuning plate 226 can be made to obtain the fine setting of certain anglec of rotation.
Finely tune after finishing, then drive lifter plate 212 to rise and circuit board is tested again；
If test is passed through, central authorities' control then can control ejecting plate arm will deliver to the second lowering or hoisting gear by the circuit board of test
Test passes area, if test do not pass through, the test failure area of the second lowering or hoisting gear then delivered to by this circuit board by ejecting plate arm.
After the circuit board in test passes area or test failure area is piled, under its corresponding second lowering or hoisting gear meeting automatically
Fall, and it is defeated to drive the second conveyer belt on the second lowering or hoisting gear that the output flat board being loaded with slowdown monitoring circuit plate is delivered to described roller
Go out device, finally sent by roller output device.
Take after slowdown monitoring circuit plate, output flat board can be sent back to again and survey for receiving again on the second lowering or hoisting gear
Circuit board.
So complete the fully automatic circuit board four line test machine of this preferred embodiment test process to circuit board.
The feed unit of the fully automatic circuit board four line test machine of this preferred embodiment can convey whole folded circuit board, test
Unit can automatically carry out para-position to the circuit board not passing through to test and finely tune and test, and discharging unit will be able to be tested according to test result
The circuit board finishing is delivered to corresponding region, efficient input and classification output and accurate para-position test, significantly carry
The high efficiency of circuit board testing and yield, reduce cost simultaneously, decrease the waste of resource.
In sum although the present invention is disclosed above with preferred embodiment, but above preferred embodiment and be not used to limit
The present invention processed, those of ordinary skill in the art, without departing from the spirit and scope of the present invention, all can make various change and profit
Decorations, therefore protection scope of the present invention is defined by the scope that claim defines.
Claims (10)
1. a kind of fully automatic circuit board four line test machine is it is characterised in that described fully automatic circuit board four line test machine includes：
Feed unit, for being sent to test position by circuit board from placement position；
Discharging unit, it is according to test by whether the circuit board being completed being delivered to corresponding region, described region
Including test passes area and test failure area；
Test cell, for whether qualified test is carried out to circuit board, it include support, central processing unit, ccd sensor,
Micromatic setting and measurement jig, described central processing unit is electrically connected with described ccd sensor, described micromatic setting；
Wherein said micromatic setting includes finely tuning slide unit and tuning plate, and described measurement jig includes needle plate and jig plate, described micro-
The one side of tuned plate is connected with described fine setting slide unit, and the another side of described tuning plate is connected with described needle plate, described jig plate and institute
State support to connect, described fine setting slide unit passes through leading screw and feed screw nut and motor connection, is driven.
2. fully automatic circuit board four line test machine according to claim 1 is it is characterised in that described feed unit includes rolling
Wheel input equipment, described rolling wheel input device includes the multiple rollers be arrangeding in parallel, and the two ends of each described roller are all connected with
Synchronizing wheel, described synchronizing wheel connects the first drivewheel by Timing Belt and is driven.
3. fully automatic circuit board four line test machine according to claim 2 it is characterised in that described rolling wheel input device also
Including multiple directive wheels, described directive wheel is located on the perpendicular bisector of two described synchronizing wheel lines, and multiple described guiding
Wheel is respectively positioned on the same side of described synchronizing wheel, and described Timing Belt increases described Timing Belt to described synchronization by winding directive wheel
The cornerite of wheel.
4. fully automatic circuit board four line test machine according to claim 1 is it is characterised in that described feed unit also includes
Enter wrench arm, described enter wrench arm be driven by secondary conveyor, described secondary conveyor includes：
Fixing base plate, is fixedly installed motor on described fixing base plate；
Driving wheel, for generating driving force by described motor；
First transmission module, for being transferred to described intermediate plate by the driving force of described driving wheel；
Described intermediate plate, for moving to direction initialization under the driving force effect of described driving wheel；
Second transmission module, is arranged on described intermediate plate, for the driving force of described intermediate plate is transferred to delivery board；
Described delivery board；Be arranged on described intermediate plate, in the presence of the driving force of described intermediate plate, relatively described in
Between plate move to described direction initialization.
5. fully automatic circuit board four line test machine according to claim 4 is it is characterised in that described first transmission module bag
Include and be fixed on described intermediate plate, and the intermediate plate drive belt being connected with described driving wheel, described intermediate plate drive belt is described
Described intermediate plate is driven to move, so that described intermediate plate moves to described direction initialization under the driving of driving wheel；
Described second transmission module include two driven pulleys being fixed on described intermediate plate and be arranged on two described driven
Delivery board drive belt on wheel；Described delivery board drive belt side is fixedly connected with described fixing base plate, and described delivery board drives
Band opposite side is fixedly connected with described delivery board, under the drive of driving force in described intermediate plate for the described delivery board drive belt, makes
Obtain delivery board to move to described direction initialization relative to described intermediate plate；
Described intermediate plate can be moved to described direction initialization on described fixing base plate by the first slide rail, and described delivery board can lead to
Cross the second slide rail to move to described direction initialization on described intermediate plate.
6. fully automatic circuit board four line test machine according to claim 5 it is characterised in that described enter wrench arm also include
Acetabula device, described Acetabula device is made up of outer tube, expansion link, the first spring and sucker；
Described expansion link is hollow expansion link, and described expansion link is arranged in described outer tube, and one end of described expansion link extends in
It is connected outside described outer tube and with described sucker, the other end of described expansion link forms the second chamber with the diapire of described outer barrel
Room, the lateral wall of described expansion link forms first chamber with the medial wall of described outer tube, and described first chamber and external vacuum are sent out
Raw device connects, and described second chamber is connected with ambient atmosphere by described expansion link, described first chamber and described second chamber
It is connected by pore；
Described first spring is located in described first chamber, and on described expansion link, described expansion link leans on described first spring housing
One end of closely described second chamber is provided with the first limiting plate for limiting described first spring, the inside setting of described outer tube
There is the second limiting plate for limiting described first spring.
7. fully automatic circuit board four line test machine according to claim 1 is it is characterised in that described feed unit also includes
Belt conveyor, is provided with first liter for transporting circuit board between rolling wheel input device and described belt conveyor
Falling unit, described first lowering or hoisting gear includes first conveyer belt, for receiving the input flat board being loaded with circuit board under test；
It is additionally provided with anticollision mechanism in described belt conveyor near the side of described first lowering or hoisting gear, described anticollision mechanism
Along the lifting direction setting of described first lowering or hoisting gear, described anticollision mechanism is by anticollison block, second spring, jump ring, induction apparatuss
With baffle plate composition；
Described anticollison block is located at the bottom of described baffle plate, and described induction apparatuss are arranged on the side of described baffle plate, described induction apparatuss control
Make the lifting of described first lowering or hoisting gear, described anticollison block is connected with described second spring by described jump ring, and described
Under the elastic force effect of two springs, described anticollison block is not contacted with described induction apparatuss, when described anticollison block touches described induction apparatuss,
Described first lowering or hoisting gear can stop ascending motion；
In described baffle plate, the side of circuit board is provided with oblique angle, is beneficial to the electricity that described first lowering or hoisting gear conveying is come
Road plate guides, and prevents its sideslip in motor process.
8. fully automatic circuit board four line test machine according to claim 1 is it is characterised in that described feed unit also includes
Dust arrester, described dust arrester combines with belt conveyor so that described dust arrester can be on belt conveyor
Circuit board carries out dedusting, and described dust arrester is made up of support, upper and lower two binding dust wheels and upper and lower two binding dust paper rolls, described on
Binding dust wheel, described lower binding dust wheel, described upper binding dust paper roll and described lower binding dust paper roll all be arranged in parallel, described upper binding dust paper roll position
On described upper binding dust wheel, described lower binding dust paper roll is located under described lower binding dust wheel；
The rotary shaft of described lower binding dust wheel is fixedly connected with described support by bearing, and the rotary shaft of described upper binding dust wheel passes through axle
Hold and be flexibly connected with described support so that the distance between described upper binding dust wheel and described lower binding dust wheel are freely adjustable；
The rotary shaft of described upper binding dust paper roll be flexibly connected with described support by bearing so that upper binding dust paper roll gravity work
With under keep contact with described upper binding dust wheel all the time, the rotary shaft of described lower binding dust paper roll is passed through bearing and is connected with described support activity
Connect, and the bottom of the rotary shaft of described lower binding dust paper roll is connected with described rack elasticity by the 3rd spring so that lower dust sticky paper
Volume contacts with remaining between lower binding dust wheel.
9. fully automatic circuit board four line test machine according to claim 1 is it is characterised in that the bottom of described micromatic setting
It is provided with substrate, described fine setting slide unit includes the first slide unit and the second slide unit, described first slide unit arranges on the substrate, institute
State the second slide unit to be arranged on described first slide unit, the glide direction of described first slide unit and described second slide unit is orthogonal,
The slip plane of described first slide unit and described second slide unit is parallel to each other, and described micromatic setting at least includes two described fine settings
Slide unit；
All by feed screw nut and leading screw and motor connection, motor arranges on the substrate each described fine setting slide unit, each
The side of one of glide direction in corresponding described fine setting slide unit for the motor connection, and the transmission direction of two motors is mutual
Vertically.
10. fully automatic circuit board four line test machine according to claim 9 is it is characterised in that described fine setting slide unit also wraps
Include connected unit, described connected unit is connected on described second slide unit by a rotary shaft, described tuning plate passes through described company
Connect platform to be fixedly connected with described fine setting slide unit.
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|---|---|---|---|
| CN201611093163.4A CN106405381B (en) | 2016-12-01 | 2016-12-01 | The line test machine of fully automatic circuit board four |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611093163.4A CN106405381B (en) | 2016-12-01 | 2016-12-01 | The line test machine of fully automatic circuit board four |
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| CN106405381A true CN106405381A (en) | 2017-02-15 |
| CN106405381B CN106405381B (en) | 2017-11-03 |
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| CN108802593A (en) * | 2018-04-12 | 2018-11-13 | 合肥英唐电子有限公司 | A kind of full-automatic testing equipment for testing the finished product sealing circuit board for having charactron |
| CN109324283A (en) * | 2018-11-19 | 2019-02-12 | 伟创力电子技术(苏州)有限公司 | A kind of automatic delivery circuit panel device for X ray test |
| CN109342924A (en) * | 2018-10-24 | 2019-02-15 | 安徽达胜电子有限公司 | A kind of pcb board detection device and detection method |
| CN109625830A (en) * | 2018-10-24 | 2019-04-16 | 安徽达胜电子有限公司 | A kind of feeding device and charging method of integrated circuit board detection |
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| CN115616331A (en) * | 2022-12-19 | 2023-01-17 | 深圳市高麦电子有限公司 | Precise four-wire type testing machine |
| CN115616331B (en) * | 2022-12-19 | 2023-12-01 | 深圳市高麦电子有限公司 | Precise four-wire type testing machine |
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