CN113030694A

CN113030694A - Floating testing device for multiple groups of PCB boards

Info

Publication number: CN113030694A
Application number: CN202110010263.0A
Authority: CN
Inventors: 张云龙; 于贵伟; 黄春雷; 干恩
Original assignee: Suzhou Linktron Systems Co ltd
Current assignee: Suzhou Lingchuang Technology Development Co ltd; Suzhou Linktron Systems Co ltd
Priority date: 2021-01-06
Filing date: 2021-01-06
Publication date: 2021-06-25
Anticipated expiration: 2041-01-06
Also published as: CN113030694B

Abstract

The invention provides a multi-group PCB floating testing device, which relates to the technical field of PCB testing and processing, and comprises a first assembly line rack and a second assembly line rack arranged on the side edge of the first assembly line rack in parallel, wherein the top end surface of the first assembly line rack is a horizontal plane, the middle part of the top end of the first assembly line rack is a hollow structure, and first conveying belts are symmetrically arranged on the front side and the rear side of the top end of the first assembly line rack; fifth blowers on two sides of a fifth supporting case are communicated with a fifth exhaust device at the bottom end of a fifth lifting platform through a fifth exhaust pipe; the PCB surface of the test PIN needle pre-connection is pre-purged, so that the surface of the PCB connected with the test PIN needle is clean and tidy, dust is prevented from falling into metal contacts on the surface of the PCB, the dust is prevented from influencing signal communication between the test PIN needle and the metal contacts on the surface of the PCB, the test safety is improved, the test accuracy is improved, the number of wrong recognition failures is reduced, and the test efficiency is improved.

Description

Floating testing device for multiple groups of PCB boards

Technical Field

The invention relates to the technical field of PCB testing and processing, in particular to a multi-group PCB floating testing device.

Background

In PCB board production line use, whether the PCB that need burn the procedure in order to verify production to the PCB board can normal use, it is current, in the test procedure to the PCB board, need carry out the program processing to the PCB board on the equipment station of difference, clean the dust removal to PCB board surface earlier if necessary, test PCB board device on the layer board again, consequently, the PCB board is in the test procedure, need switch over the position between the PCB board on the equipment station of difference, this process has taken the time efficiency of the production line body.

In the prior art, when a single PCB is subjected to burning program test, whether the PIN PINs are in good contact with the metal contact on the surface of the PCB is tested, the PIN PINs can be directly watched by naked eyes, and the multiple PCBs are simultaneously tested, fine particle dust falls into the metal contact on the surface of the PCB, signal communication between the PIN PINs and the metal contact on the surface of the PCB is influenced, unstable signal transmission is caused, test failure or misjudgment is easily caused, and the PCB production efficiency of an enterprise is reduced.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a floating test device for multiple groups of PCB boards, which solves the problems in the prior art, the PCB testing is mainly performed by adopting a burning program, and during the burning program, a plurality of test PIN needles are required to be contacted with metal contacts on the surface of the PCB to realize data transmission and communication, in the prior art, one PCB is tested, when a burning program test is carried out on a single PCB, whether the contact between the PIN needle and the metal contact on the surface of the PCB is good or not is tested and can be obtained by direct observation through naked eyes, and carry out the concurrent test to polylith PCB board, tiny granule dust falls into the metal contact on PCB board surface, influences the signal communication of test PIN needle and PCB board surface metal contact, causes signal transmission unstable, easily causes the test failure or misjudgment to damage for the PCB board, causes the technical problem that enterprise production PCB board efficiency reduces.

The technical problem to be solved by the invention is realized by adopting the following technical scheme: a multi-group PCB floating testing device comprises a first assembly line rack and a second assembly line rack arranged on the side edge of the first assembly line rack in parallel, wherein the top end face of the first assembly line rack is a horizontal plane, the middle part of the top end of the first assembly line rack is of a hollow structure, first conveying belts are symmetrically arranged on the front side and the rear side of the top end of the first assembly line rack, a supporting plate is placed on the top end of the first assembly line rack, a plurality of PCBs are arranged at equal intervals in a matrix manner on the top end of the supporting plate, the supporting plate is placed on the first conveying belts on the front side and the rear side of the top end of the first assembly line rack, the first conveying belt on each side is a flat belt, and the first conveying belt on each side is provided with an independent;

the PCB floating test device comprises a first assembly line rack, a discharging rack, a PCB non-contact cleaning device, a first test station and a plurality of groups of PCB floating test devices, wherein the discharging rack is fixedly arranged on the left side of the first assembly line rack; the first test station is arranged on the right side of the PCB contactless cleaning device at the top end of the first assembly line rack, and a placement circulating device is fixedly arranged on the right side of the first assembly line rack;

the multi-group PCB floating testing device comprises a fifth supporting case arranged above the first assembly line rack, a fifth electric push rod is fixedly mounted at the top end of the fifth supporting case, a push rod extends downwards from the fifth electric push rod, a fifth lifting table is fixedly mounted at the bottom end of the push rod of the fifth electric push rod, and a plurality of test PIN needles electrically connected with each group of PCBs placed on the supporting plate are arranged at the bottom end of the fifth lifting table;

fifth air blowers are symmetrically and fixedly arranged on the left side and the right side of the fifth supporting case, fifth air exhaust devices are arranged at the bottom end of the fifth lifting platform at equal intervals, and the fifth air blowers on the two sides of the fifth supporting case are communicated with the fifth air exhaust devices at the bottom end of the fifth lifting platform through fifth exhaust pipes;

the left side and the right side of the bottom end of the supporting plate are symmetrically provided with a metal electric connecting piece, and the two metal electric connecting pieces are electrically connected in the supporting plate through a conducting wire;

two conductive terminals matched with the metal electric connecting pieces are fixedly arranged in a middle vacant area of the first assembly line rack, the two conductive terminals are arranged under a fifth supporting case, two sides of the inner wall of the top end of the first assembly line rack are symmetrically provided with flow blocking rods, the flow blocking rods on two sides of the inner wall of the first assembly line rack are arranged on the right sides of the conductive terminals, and the flow blocking rods on each side are positioned above the first conveying belt on two sides of the inner wall of the first assembly line rack;

the left side wall of the flow blocking rod is fixedly provided with a magnetic block, and the right side of the supporting plate is provided with an iron sheet corresponding to the magnetic block.

As a preferred technical scheme of the invention, three layers of test boards are sequentially arranged at the bottom end of the fifth lifting platform upwards, and each layer of test board is a horizontally arranged thin board;

the testing board at the bottommost layer is a fixed testing board fixed at the bottom of a fifth lifting platform, the fixed testing board is parallel to the bottom end of the fifth lifting platform, and the bottom end of the fixed testing board is provided with a testing PIN (personal identification number) PIN standing upright at the bottom end of the fixed testing board;

the test board of the middle layer is a first floating test board arranged above the fixed test board, the first floating test board can reciprocate above the fixed test board, the top end of the fifth lifting platform is fixedly provided with two first electric push rods, the two first electric push rods are arranged on the left side and the right side of the first floating test board, the first electric push rod on each side extends downwards to form a first push rod, the bottom end of the first push rod of the first electric push rod on each side is fixed on the first floating test board, and the bottom end of the first floating test board is provided with a test PIN needle standing upright at the bottom end of the first floating test board;

the top-most test board is a second floating test board arranged above the first floating test board, the second floating test board can reciprocate above the first floating test board, a second electric push rod is fixedly installed in the middle of the top end of the fifth lifting platform, a push rod extends downwards from the second electric push rod, the bottom end of the push rod of the second electric push rod is fixed on the top surface of the second floating test board, and a test PIN needle which is erected at the bottom end of the second floating test board is arranged at the bottom end of the second floating test board;

the test PIN needle of fixed test board bottom, the test PIN needle of the unsteady test board bottom and the test PIN needle length of the unsteady test board bottom of No. two all is different, and the test PIN needle of fixed test board bottom is shortest, and the test PIN needle of the unsteady test board bottom of No. two is longest.

As a preferred technical scheme of the invention, each test PIN comprises a sixth pressure spring, a sixth pressure spring groove, a floating thimble, an arc-shaped elastic sheet and a bent elastic sheet, the test PIN is arranged in a round bar structure, the sixth pressure spring groove is formed in the middle of the bottom end of the test PIN, the floating thimble is arranged in the sixth pressure spring groove at the bottom end of the test PIN in a sliding fit manner, the sixth pressure spring is fixedly arranged at the top end of the floating thimble embedded in the sixth pressure spring groove, the bottom end of the floating thimble extends out of the bottom end of the test PIN, the floating thimble is arranged in a round bar structure, and a clamping groove is formed in the outer circumferential surface of the floating thimble close to the bottom end of the floating thimble;

the testing PIN comprises a floating thimble and is characterized in that a plurality of bent arc-shaped elastic sheets are arranged on the outer circumferential surface of the bottom end of the testing PIN at equal intervals, each bent arc-shaped elastic sheet is provided with a section of bent elastic sheet formed by folding and bending, and the bottom end of each bent elastic sheet is clamped in a clamping groove in the outer circumferential surface of the floating thimble.

As a preferred technical scheme of the invention, the floating thimble comprises a seventh pressure spring groove arranged on the bottom surface of the bent elastic sheet, two sides of the inner wall of the seventh pressure spring groove are provided with limiting sliding grooves parallel to the axis of the seventh pressure spring groove, a floating metal head with a round bar structure is arranged in the seventh pressure spring groove in a sliding fit manner, a convex seventh slider is arranged on the outer circular surface of the floating metal head embedded in the floating metal head in a sliding fit manner, and the seventh slider on the outer circular surface of the floating metal head is connected with the limiting sliding grooves on the inner wall of the seventh pressure spring groove in a sliding manner;

and a seventh pressure spring is fixedly arranged at the top end of the floating metal head embedded in the seventh pressure spring groove.

As a preferred technical scheme of the invention, the top end of the floating thimble is rotatably connected with a rotating flange along the outer circular surface of the floating metal head, the rotating flange is of a cylindrical structure, and a plurality of contact steel balls are arranged on the bottom end surface of the rotating flange at equal intervals;

the middle part of the rotary flange is provided with a through round hole, the round hole in the middle part of the rotary flange is sleeved on the outer circular surface of the floating metal head, the inner wall of the round hole of the rotary flange is provided with a raised guide pin, the outer circular surface of the floating metal head is provided with a sunken guide chute, the guide chute is of an S-shaped structure, and the guide pin on the inner wall of the round hole of the rotary flange is connected into the guide chute in a sliding manner.

As a preferred technical scheme of the present invention, multiple rows of fifth pinch roller support legs standing upright at the bottom end of the fifth lifting table are symmetrically arranged on the left and right sides of the bottom end of the fifth lifting table, a two-stage compression spring is arranged in the middle of the fifth pinch roller support leg on each side, the bottom end of the fifth pinch roller support leg in each row is rotatably connected with a fifth pinch roller, and a fifth pinch belt is connected between the corresponding fifth pinch rollers in each row on both sides.

As a preferable technical solution of the present invention, the fifth pressing belt is a flat belt.

As a preferred technical scheme of the present invention, a plurality of spring grooves are symmetrically formed on the left and right sides of the bottom end of the fifth lifting platform, the top end of each fifth pinch roller supporting leg extends into the corresponding spring groove at the bottom end of the fifth lifting platform through sliding connection, and a fifth pressure spring is fixedly installed at the top end of the fifth pinch roller supporting leg embedded in the spring groove.

Compared with the prior art, the invention has the beneficial effects that:

first, the left side and the right side of a fifth supporting case are symmetrically and fixedly provided with fifth air blowers, fifth air exhaust devices are arranged at the bottom end of a fifth lifting platform at equal intervals, and the fifth air blowers at the two sides of the fifth supporting case are communicated with the fifth air exhaust devices at the bottom end of the fifth lifting platform through fifth exhaust pipes; the PCB surface of the test PIN needle pre-connection is pre-purged, so that the surface of the PCB connected with the test PIN needle is clean and tidy, dust is prevented from falling into metal contacts on the surface of the PCB, the dust is prevented from influencing signal communication between the test PIN needle and the metal contacts on the surface of the PCB, the test safety is improved, the test accuracy is improved, the number of wrong recognition failures is reduced, and the test efficiency is improved.

The two conductive terminals are in sliding contact with the metal electric connection piece at the bottom end of the supporting plate, so that a circuit between the two conductive terminals is connected, a signal is sent to the flow blocking rod, the flow blocking rod extends out of the upper portion of the first conveying belt on two sides of the inner wall of the first assembly line rack, the supporting plate above the first conveying belt is blocked, the supporting plate is in contact with the flow blocking rod through conveying of the first conveying belt, the magnetic blocks on the side wall of the flow blocking rod are matched with the iron sheet on the right side of the supporting plate, the position of the supporting plate is fixed, and further the position of the supporting plate is locked, so that the contact accuracy of the test PIN for the metal contact on the surface of the PCB is improved, the test PIN is prevented from being connected with the metal contact on the surface of.

The two conductive terminals are in sliding contact with the metal electric connection piece at the bottom end of the supporting plate, so that a circuit between the two conductive terminals is connected, a signal is sent to the flow blocking rod, the flow blocking rod extends out of the upper portion of the first conveying belt on two sides of the inner wall of the first assembly line frame 1, the supporting plate above the first conveying belt is blocked, the supporting plate is in contact with the flow blocking rod through conveying of the first conveying belt, the magnetic block on the side wall of the flow blocking rod is matched with the iron sheet on the right side of the supporting plate, the position of the supporting plate is fixed, the position of the supporting plate is further locked, the contact accuracy of the test PIN for the metal contact on the surface of the PCB is improved, the test PIN is prevented from being connected with the metal contact on the surface of the PCB.

Fourthly, the invention controls the test PIN needles on the bottom surface of the fixed test board to contact with the metal contacts on the surfaces of the PCB boards on the lower supporting plate by the lifting of the fifth lifting platform through the fixation of the fixed test board, so as to realize the on-line test of one program on the PCB boards at the same time, the test PIN needles on the bottom end of the first floating test board contact with other metal contacts on the surfaces of the PCB boards by the lifting of the first floating test board, so as to realize the on-line test of the other program, the invention can realize the switching of different programs through the second floating test board, the first floating test board and the test PIN needles under the fixed test board, so as to carry out the on-line test of different programs on the PCB boards with different structures,

according to the invention, the plurality of PCB boards are placed at the top end of the supporting plate, so that the plurality of PCB boards can be synchronously tested. The test efficiency of the surface of the PCB is improved.

Fifth, the invention realizes the transmission connection of the program signal by the contact of the bottom end of the testing PIN needle and the metal contact on the surface of the PCB, and because the metal contact on the surface of the PCB is inevitably adhered with granular dust, the bottom end of the testing PIN needle can be in poor contact with the metal contact on the surface of the PCB, the invention arranges an elastic flexible floating thimble at the bottom end of the testing PIN needle, when the bottom end of the testing PIN needle is in contact with the metal contact and is pressed downwards, the floating thimble can extend into a sixth pressure spring groove, at the moment, the peripheral bending spring sheet and the arc spring sheet can be driven to bend, and the arc spring sheet at the periphery of the floating thimble can be slightly dispersed outwards, the tight joint of the testing PIN needle and the metal contact can be effectively ensured by the contact of the surface of the arc spring sheet and the surface of the metal contact, and the contact of a plurality of arc spring sheets and a plurality of areas of the same metal contact can be realized by arranging the, even if one of the arc-shaped elastic sheets is in poor contact with the metal contact, and the other arc-shaped elastic sheets are in good contact with the metal contact, the stable transmission connection of effective program signals can still be kept.

Sixth, the bending elastic sheet at the top end of the arc-shaped elastic sheet can enable the bending elastic sheet to be bent more easily, so that elastic lifting of the floating thimble is effectively reduced, and good contact of the test PIN on the surface of the metal contact is effectively improved. The stable transmission of the program signal in the PCB online test process is improved.

And seventhly, when the testing PIN is in contact with the surface of the metal contact through the floating metal head, the floating metal head is pressed to axially lift towards the seventh pressure spring groove, and the guide PIN and the rotating flange are pushed to rotate through the guide sliding groove on the outer circular surface of the floating metal head in the axial lifting process of the floating metal head, so that when the surface of the floating metal head is in poor contact with the surface of the metal contact, the rotating flange rotates on the surface of the metal contact in a reciprocating manner, the rotating flange is in good contact with the surface of the metal contact, and the good contact of the testing PIN on the surface of the metal contact can be still maintained. The invention effectively improves the stable transmission of the program signal in the online test process of the PCB, and reduces the friction of the bottom surface of the rotating flange on the surface of the metal contact through the contact steel balls when the bottom surface of the rotating flange rotates on the surface of the metal contact by arranging the plurality of contact steel balls on the bottom surface of the rotating flange, thereby avoiding the surface of the metal contact from being scratched in the test process and improving the test safety.

Eighthly, the surfaces of the PCBs at the top ends of the supporting plates are slightly compressed through the fifth compression wheels and the fifth compression belt, so that the PCBs are prevented from floating when the surfaces of the PCBs are in contact with the test PIN PINs, and good contact between the test PIN PINs and metal contacts on the surfaces of the PCBs is improved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic diagram of a front view structure of an integrated test production line for multiple test procedures of a PCB board according to the present invention;

FIG. 2 is a schematic view of a top view of the integrated PCB testing production line;

FIG. 3 is a schematic diagram of the right side view of the circulation device according to the present invention;

FIG. 4 is a schematic left side view of the traversing apparatus according to the present invention;

FIG. 5 is a schematic cross-sectional view of a first chuck of the present invention;

FIG. 6 is a schematic diagram of a front view of the PCB surface non-contact cleaning device of the present invention;

FIG. 7 is a schematic top view of a second blowing device of the present invention installed in a hollow area of a first assembly line rack;

FIG. 8 is a left side view of the cleaning device for cleaning PCB surface without contact according to the present invention;

FIG. 9 is an enlarged partial schematic view of FIG. 8 in accordance with the teachings of the present invention;

FIG. 10 is a schematic top view of the first air moving blade rotatably connected to the second blowing device at the bottom of the rotating frame according to the present invention;

FIG. 11 is a schematic left sectional view of the first air moving blade rotatably connected to the second interior of the blowing device according to the present invention;

FIG. 12 is a schematic sectional front view of the rotary blowing head of the present invention rotatably connected to the inside of the rotating frame;

FIG. 13 is a schematic view of the structural connection of the wind-shielding film at the bottom of the elevating base according to the present invention;

FIG. 14 is a schematic bottom view of the wind-shielding film of the present invention mounted on the bottom of the fourth lifting platform;

FIG. 15 is a schematic diagram of a front view of the floating test device for multiple PCB boards according to the present invention;

FIG. 16 is a schematic cross-sectional view of the bottom of the test PIN of the present invention;

FIG. 17 is an enlarged fragmentary view at D of FIG. 16 in accordance with the teachings of the present invention;

FIG. 18 is a schematic cross-sectional view of a fifth pinch roller leg embedded in the bottom end of a fifth elevating platform according to the present invention;

FIG. 19 is a schematic bottom view of the bottom surface of the test PIN of the present invention;

FIG. 20 is an enlarged fragmentary view at E of FIG. 17 in accordance with the teachings of the present invention;

FIG. 21 is a schematic top view of a pallet of the present invention;

FIG. 22 is a bottom view of the pallet of the present invention;

fig. 23 is a schematic structural view of positions of the conductive terminals and the choke rod on the bottom surface of the fifth supporting chassis according to the present invention;

in the figure: 1. a first assembly line rack; 2. a first conveying belt; 3. a discharging rack; 4. the PCB surface is provided with a non-contact cleaning device; 401. a fourth electric push rod; 402. a lifting base; 403. a suction fan; 404. an air suction pipeline; 405. supporting legs; 406. Connecting an air faucet; 407. a fourth elevating platform; 408. a dust collection tray; 409. a pressing lever; 4091. a fourth pressure spring; 410. pressing the roller; 411. a compression band; 412. a first blowing device; 413. a second blowing device; 414. an infrared laser correlation sensor; 415. a groove; 416. a rotating frame; 417. rotating the blowing head; 418. a blowing nozzle; 419. a wind shielding film 420, a first air moving blade; 421. A first air inlet channel; 422. a second air inlet channel; 423. a third air intake duct; 424. a fourth air inlet channel; 425. a second pneumatic blade; 426. a fifth air inlet channel; 427. a sixth air inlet channel; 428. a winding slot; 429. a spool; 430. an infrared laser correlation sensor B; 431. a seventh air inlet channel; 5. a traversing device; 501. a third support frame; 502. a third drive gear; 503. A third conveyor belt; 504. a third push rod; 505. a third electric push rod; 6. a support plate; 601. metal electric connecting pieces, 7, a second assembly line frame; 8. a second conveying belt; 10. placing a circulating device; 1001. a first electric push rod; 1002. placing a transfer rack; 1003. a first elevating platform; 1004. a first air receiving nozzle; 1005. a first suction cup; 10051. locking the edge; 10052. a small suction cup; 10053. a sucker basement membrane; 10054. bowl noodles; 1006. a first slider; 1007. an air nozzle; 1008. a sixth electric push rod; 11. a second test station; 12. a first test station; 13. supporting legs; 14. a reciprocating lifting device; 1401. a second electric push rod; 1402. a second lifting table; 1403. a second conveyor belt; 1404. a second drive gear; 1405. a second baffle; 15. a bearing frame; 16. placing a material box; 17. a bottom support table; 18. a feed back rack; 21. a plurality of groups of PCB floating test devices; 2101. a fifth electric push rod; 2102. a fifth supporting chassis; 2103. a fifth elevating platform; 2104. a fifth exhaust device; 2105. a fifth blower; 2106. a fifth exhaust duct; 2107. a first electric push rod; 2108. a fifth pressure spring; 2109. a first push rod; 2110. testing a PIN needle; 2111. a fifth compression band; 2113. a fifth pinch roller; 2114. fifth pinch roller support legs; 2115. a secondary pressure spring; 2116. fixing the test board; 2117. a first floating test plate; 2118. a second floating test plate; 2119. a seventh pressure spring; 2120. a conductive terminal; 2121. a second electric push rod; 2122. a sixth pressure spring; 2123. a sixth compression spring groove; 2125. a floating thimble; 2126. an arc-shaped elastic sheet; 2127. bending the elastic sheet; 2128. a floating metal head; 2129. a guide chute; 2130. a guide pin; 2131. a limiting chute; 2132. a seventh compression spring groove; 2133. a seventh slider; 2134. contacting the steel ball; 2135. rotating the flange; 2137. a choke lever; 2138. a magnetic block; 2139. and a seventh pressure spring.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further described below by combining with the specific drawings, and it is to be noted that the embodiments and the features in the embodiments can be combined with each other in the application without conflict.

Example 1

Please refer to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, which are schematic structural diagrams of an integrated testing production line for multiple testing processes of a PCB.

Referring to fig. 1 and 2, the integrated test production line for multiple testing processes of the PCB plates comprises a first assembly line rack 1 and a second assembly line rack 7 which are arranged on the side edge of the first assembly line rack 1 in parallel, wherein the top end surface of the first assembly line rack 1 is a horizontal plane, the middle part of the top end of the first assembly line rack 1 is of a hollow structure, first conveying belts 2 are symmetrically arranged on the front side and the rear side of the top end of the first assembly line rack 1, a supporting plate 6 is arranged on the top end of the first assembly line rack 1, a plurality of PCB plates are arranged on the top end of the supporting plate 6 at equal intervals in a matrix manner, the supporting plate 6 is arranged on the first conveying belts 2 on the front side and the rear side of the top end of the first assembly line rack 1, the first conveying belt 2 on each side is a flat belt, and the;

wherein, through a servo motor drive conveyer belt 2 at the inner wall endless rotation of an assembly line frame 1, make layer board 6 can flow at the top of an assembly line frame 1, and then accomplish the assembly line test to the multiunit PCB board.

Wherein, a plurality of bearing grooves that are used for placing the PCB board are seted up according to the matrix on the top of layer board 6, and polylith PCB board is placed according to the bearing groove of layer board 6, and the support groove is sunken heavy groove, and when the PCB board was placed in the support groove, the top surface of PCB board and layer board 6's top surface were equal height.

The left side of the first assembly line frame 1 is fixedly provided with a discharging frame 3, the discharging frame 3 is provided with a manipulator, the manipulator can replace human hands to place a plurality of PCBs according to the position of a bearing groove of a supporting plate 6, and further, the flow of the supporting plate 6 in the first assembly line frame 1 is used for completing a plurality of functional tests on the PCBs, the middle part of the top end of the first assembly line frame 1 is fixedly provided with a PCB surface non-contact cleaning device 4, the PCB surface on the supporting plate is cleaned in a non-contact way through the PCB surface non-contact cleaning device 4, the damage to surface elements of the PCB during cleaning can be reduced, the situation that the surface of the elements is shaken in the contact type cleaning process adopted in the prior art to cause poor contact of the elements is avoided, the middle part of the first assembly line frame 1 is fixedly provided with a first testing station 12, and the first testing station 12 is arranged on, clean earlier the retest through PCB board surface contactless cleaning device 4 to the PCB board on layer board 6 top, circuit connection is bad in avoiding the test process, clean earlier the retest through the surface to the determinand, and then improve the test accuracy nature of PCB board effectively, 1 right side fixed mounting of assembly line frame has places circulating device 10, through placing circulating device 10 with survey the PCB board that the formula was accomplished from layer board 6 and shift the pile up, improve the efficiency of ending operation after the test was accomplished, through placing circulating device 10 to shifting out in layer board 6 carries to the left blowing frame 3 of assembly line frame 1 through feed back frame 18 to the layer board that moves out the PCB board, realize cyclic utilization, this production line can reduce the use of layer board, need not the layer board that the user carried and is used for testing the PCB board, and can improve the efficiency of test.

Referring to fig. 3, the placing and circulating device 10 includes a placing and transferring rack 1002, the placing and transferring rack 1002 is disposed above the right side of the first assembly line rack 1, a first slide seat 1006 is mounted at the top end of the placing and transferring rack 1002 in a sliding fit manner, a sixth electric push rod 1008 is fixedly mounted on the left side of the placing and transferring rack 1002, a push rod extends from the sixth electric push rod 1008 to the right, the top end of the push rod of the sixth electric push rod 1008 is fixed on the left side of the first slide seat 1006, a first electric push rod 1001 is fixedly mounted at the top end of the first slide seat 1006, a push rod extends from the bottom end of the first electric push rod 1001 downwards, a first lifting platform 1003 is fixedly mounted at the bottom end of the push rod of the first electric push rod 1001, a plurality of first suction cups 1005 are fixedly mounted at equal intervals at the bottom end of the first lifting platform 1003, a first air receiving nozzle 1004 is fixedly mounted at the top end of the first lifting platform 1003;

the bottom of the placing and transferring rack 1002 is provided with two stations, one station of the placing and transferring rack 1002 is arranged on the right side of the first assembly line rack 1, and the other station of the placing and transferring rack 1002 is arranged in front of or behind the right side close to the first assembly line rack 1; the bottom of the other station for placing the transfer rack 1002 is fixedly provided with a bearing rack 15, and a plurality of layers of material placing boxes 16 are orderly stacked at the top end of the bearing rack 15;

specifically, the first lifting platform 1003 is controlled to descend through the first electric push rod 1001, a plurality of PCBs on the lower supporting plate 6 are grabbed through the first sucking discs 1005, each first sucking disc 1005 grabs a corresponding PCB, so that grabbing is firm, after grabbing, the PCBs are lifted upwards through the first lifting platform 1003, the first sliding base 1006 is pushed to move rightwards through the sixth electric push rod 1008, the PCBs are descended to the position close to the material placing box 16 through the first lifting platform 1003, the PCBs are put down through the first sucking discs 1005 to finish transferring of the PCBs, automatic operation is realized in the whole operation process, the PCBs do not need to be manually taken down from the supporting plate 6, secondary damage to the tested PCBs when the PCBs are manually taken down is avoided, picking up through the first sucking discs 1005 is beneficial to improving transferring efficiency, and the neatness of a plurality of PCBs is improved, reduce the manpower loss, reduce the manufacturing cost of enterprise.

Four corners equidistant in waterline frame 1 bottom are provided with supporting leg 13 and support, supporting leg 13 middle part fixed mounting of 1 bottom of assembly line frame has feed back frame 18, both sides are to installing circulation pivoted conveyer belt around the feed back frame 18 top, feed back frame 18 is parallel with 1 top surface of assembly line frame in the bottom of assembly line frame 1 No. one, the left and right sides of feed back frame 18 is isometric with the left and right sides of assembly line frame 1 No. one, feed back frame 18's the left and right sides fixed mounting has a reciprocal elevating gear 14 separately.

Wherein, the support plate 6 is arranged below the placement circulating device 10 at the rightmost side of the first assembly line frame 1, a plurality of PCB plates are taken down from the support plate 6 and transferred into the material placing box 16 for collection, the support plate 6 is an empty disc at the moment, the support plate 6 is manually taken back into the material placing frame 3 at the leftmost side of the first assembly line frame 1 in the prior art, the operation is complicated, the invention supports the support plate 6 at the rightmost side of the first assembly line frame 1 through the reciprocating lifting device 14, the support plate 6 at the rightmost side of the first assembly line frame 1 is downwards moved to the right side of the material returning frame 18 through the reciprocating lifting device 14, the bottom surface of the support plate 6 is slightly higher than the top surface of the conveying belt of the material returning frame 18 through the support of the reciprocating lifting device 14, and the support plate 6 is conveyed to the top surface of the conveying belt of the material returning frame 18 through the second conveying belt 1403 on the reciprocating lifting device 14 to the left side, when in transfer, the rotation direction of the second conveyor belt 1403 is the same as the rotation direction of the conveyor belt on the feed back rack 18, thereby realizing transfer, improving the transfer stability, reducing the damage to the bottom surface of the supporting plate 6, conveying the PCB plate into the emptying rack 3 on the left side of the first assembly line rack 1 through the conveyor belt on the feed back rack 18, completing the transfer of the supporting plate 6 through the reciprocating lifting device 14 on the left side of the feed back rack 18, lifting the supporting plate 6 downwards, further completing the cyclic utilization of the supporting plate 6, realizing the automatic operation of the whole process of the use and the recovery of the supporting plate 6 through the strip line, avoiding manual operation, reducing a large amount of production labor force, improving the production efficiency,

when the rotation direction of the second conveying belt 1403 on the reciprocating lifting device 14 is lifted to be equal to the height of the first assembly line frame 1, the rotation direction of the second conveying belt 1403 is the same as the rotation direction of the first conveying belt 2 on the first assembly line frame 1, when the rotation direction of the second conveying belt 1403 on the reciprocating lifting device 14 is lifted to be equal to the height of the return frame 18, the rotation direction of the second conveying belt 1403 is the same as the rotation direction of the conveying belt on the return frame 18, and therefore when the supporting plate 6 is transferred, because the rotation directions are the same, the friction of the top surfaces of two adjacent conveying belts to the bottom surface of the supporting plate 6 can be reduced, the abrasion to the supporting plate 6 is effectively reduced, and the use safety of the supporting plate 6 is improved.

The reciprocating lifting device 14 comprises a second electric push rod 1401 fixedly installed in the middle of the supporting leg 13, a push rod is upwards extended from the second electric push rod 1401, a second lifting table 1402 is fixedly installed at the top end of the push rod of the second electric push rod 1401, the top surface of the second lifting table 1402 is a plane, circularly rotating second conveying belts 1403 are symmetrically installed on the front side wall and the rear side wall of the second lifting table 1402, second driving gears 1404 are symmetrically installed on the left side and the right side of the inner ring of the second conveying belt 1403 on each side, the second driving gears 1404 on one side are driven by an independent second servo motor, and baffles 1405 are arranged on the top surface of the second lifting table 1402.

Wherein, can prevent the migration distance of layer board 6 at second conveyer belt 1403 through baffle 1405, avoid baffle 1405 to move the dislocation to improve the precision of the PCB board on first sucking disc 1005 sucking disc layer board 6.

The second assembly line rack 7 is arranged on the side edge of the middle part of the first assembly line rack 1 in parallel, the second assembly line rack 7 is positioned on the right side of the PCB surface non-contact cleaning device 4 on the side edge of the first assembly line rack 1, the middle part of the top end of the second assembly line rack 7 is also of a vacant structure, the front side and the rear side of the top end of the second assembly line rack 7 are symmetrically provided with second conveying belts 8, the left side and the right side of the second assembly line rack 7 are symmetrically provided with transverse moving devices 5, the second assembly line rack 7 transfers the supporting plate 6 flowing on the first assembly line rack 1 to the second assembly line rack 7 through the transverse moving devices 5 on the left side and the right side, and the supporting plate of the second assembly line rack 7 circularly;

a plurality of groups of PCB floating test devices are fixedly arranged on the first test station 12; no. two test station 11 is fixedly installed at the middle part top of No. two assembly line frame 7, and No. two test station 11 fixed mounting have with the same structure's of installing multiunit PCB board floating test device on the test station 12.

In the prior art, the PCB testing speed is slow, the waiting time is long, and referring to PCB testing methods of other enterprises, the invention independently shunts the testing method, and further effectively improves the testing efficiency of the PCB, specifically, after the PCB on each supporting plate 6 flowing on the first assembly line rack 1 in sequence is cleaned in a non-contact way by the PCB surface non-contact cleaning device 4, the supporting plates 6 flowing on the first assembly line rack 1 in sequence are intermittently transferred by the second assembly line rack 7 parallel to the first assembly line rack 1, the first assembly line rack 1 is provided with a first testing station 12, and the first testing station 12 is fixedly provided with a plurality of groups of PCB floating testing devices; and the top end of the middle part of the second assembly line frame 7 is fixedly provided with a second testing station 11, the second testing station 11 is fixedly provided with a plurality of groups of PCB floating testing devices with the same structure as the first testing station 12, and the PCBs on the two groups of supporting plates are tested simultaneously through the first testing station 12 and the second testing station 11, so that the waiting time loss in the large-batch PCB testing process can be effectively reduced, and the PCB testing is effectively improved.

Referring to fig. 4, in the present invention, the traverse device 5 includes two third electric push rods 505 respectively disposed at the bottom of the first assembly line rack 1 and the bottom of the second assembly line rack 7, a third push rod 504 extends upward from a top end of each third electric push rod 505, a third support rack 501 is fixedly mounted at a top end of each third push rod 504, third conveyor belts 503 are symmetrically mounted on left and right side walls of the third support rack 501, the third conveyor belts 503 are disposed as flat belts, a plurality of third drive gears 502 are disposed at equal intervals on inner rings of the third conveyor belts 503 on each side, one of the third drive gears 502 is driven to rotate by an independent third motor, and two parallel third conveyor belts 503 disposed at the bottom of the first assembly line rack 1 and the bottom of the second assembly line rack 7 have the same rotating direction.

Specifically, the invention carries out synchronous reciprocating lifting through the third supporting rack 501 at the bottom of the first assembly line rack 1 and the bottom of the second assembly line rack 7, completes the transfer operation of the supporting plate 6 from the first assembly line rack 1 to the second assembly line rack 7 and from the second assembly line rack 7 to the first assembly line rack 1, when the top end of the third supporting rack 501 is provided with a sensor, when the sensor at the top end of the third supporting rack 501 senses the flowing supporting plate 6, through intelligent identification, the third supporting rack 501 at the bottom of the first assembly line rack 1 and the bottom of the second assembly line rack 7 carries out synchronous reciprocating lifting, lifts one supporting plate 6 lifted between two adjacent supporting plates 6 flowing through and completes the transfer, and when the transfer is finished, because the rotating directions of the third conveying belts 503 on the two third supporting racks 501 are the same, the damage to the bottom surface of the supporting plate 6 during the transfer can be reduced, after the transfer is completed, the third support frames 501 at the bottom of the first assembly line frame 1 and the bottom of the second assembly line frame 7 are synchronously descended, so that the transferred supporting plate 6 is placed on the first conveying belt 2 corresponding to the assembly line frame and is continuously conveyed through the first conveying belt 2, and the transfer of the shunt test is effectively completed.

The sensor is an infrared sensor of a GE brand ZTP-148SR model, and whether the supporting plate 6 moves to the top end of the supporting rack 501 can be effectively sensed through the sensor. The intelligent recognition is for passing through PLC program control, cooperation infrared sensor, second servo motor's coordinated work, make the production line can move according to certain law, and count the data that infrared sensor obtained through PLC program control, and then make when the sensor perception on third support frame 501 top arrives the layer board 6 that flows through, through intelligent recognition, third support frame 501 by a assembly line frame 1 bottom and No. two assembly line frame 7 bottoms carries out synchronous reciprocal lift, lift up one of them layer board 6 that lifts up between two adjacent layer boards 6 that flow through, and accomplish and shift.

According to the invention, the transverse moving device 5 is used for transversely moving the supporting plate 6 on the first assembly line rack 1 and the second assembly line rack 7, so that the moving speed can be effectively improved, and the manpower loss in the manual moving process can be reduced.

Referring to fig. 4, the placing and transferring frame 1002 further includes a plurality of air nozzles 1007 disposed on the left and right sides of the second lifting table 1402, the air nozzles 1007 on each side are fixed on the support legs on the left and right sides of the bottom end of the placing and transferring frame 1002 at equal intervals, and the air nozzles 1007 on each side can be pushed by the reciprocating electric push rod to swing left and right.

Specifically, in order to improve the firmness of the first suction disc 1005 in absorbing the PCB and avoid dust in the air from adhering to the surface of the PCB during the absorption process, the plurality of air nozzles 1007 are symmetrically arranged on the left side and the right side of the second lifting table 1402, the air nozzles 1007 swing around the PCB to blow air, and wind power is used for blowing the surface of the PCB, so that the first suction disc 1005 blows the dust on the surface of the PCB before descending to absorb the PCB, and the firmness of the first suction disc 1005 in absorbing the surface of the PCB is effectively improved.

Referring to fig. 5, each first suction cup 1005 includes a locking edge 10051, a small suction cup 10052, a suction cup bottom film 10053, a bowl surface 10054, the first suction cup 1005 is configured as an inverted bowl-shaped structure, the locking edge 10051 of a ring structure is disposed at the edge of the bottom surface of the first suction cup 1005, the bottom surface of the locking edge 10051 is configured as a plane, a layer of suction cup bottom film 10053 is disposed in the middle of the bottom surface of the first suction cup 1005, a plurality of small suction cups 10052 are disposed at equal intervals on the bottom surface of the suction cup bottom film 10053, each small suction cup 10052 is configured as an inverted bowl-shaped structure, and a conical hole-shaped bowl surface 10054 is disposed on the bottom surface of each.

Specifically, according to the invention, the suction cup bottom film 10053 is arranged in the middle of the bottom surface of each first suction cup 1005, and the space volume of the bottom surface of the first suction cup 1005 is reduced by the suction cup bottom film 10053, so that the absorption and release response speed of the first suction cup 1005 is faster when the first suction cup 1005 absorbs the surface of a PCB, and the firmness of the first suction cup 1005 in absorbing the PCB is further effectively improved.

Specifically, each first suction disc 1005 adsorbs each PCB corresponding to the top end of the supporting plate 6, the first suction disc 1005 is provided with a plurality of small suction discs 10052 at equal intervals on the bottom surface of the suction disc base film 10053 to adsorb the surface of the PCB, so that the PCB can be picked up by adsorbing the surface of the PCB or the surface element of the PCB according to the different sizes of the surface elements of the PCB according to the difference of the heights of the surface elements of the PCB when the first suction disc 1005 is blocked to adsorb, and the first suction disc 1005 can effectively avoid the phenomenon of missing or less grabbing when the first lifting platform 1003 lifts and grabs the PCB in a reciprocating manner.

The integrated test method for the multiple test procedures of the PCB comprises the following steps:

the integrated test method for multiple test procedures of the PCB specifically comprises the following steps:

s1, placing the PCB: placing the PCB to be tested on the supporting plate at equal intervals according to the structure of the supporting plate 6 through the placing rack 3;

s2, placing a supporting plate: placing the supporting plate 6 with the PCB placed in the step S1 on the first conveying belt 2 at the top end of the first assembly line rack 1, and dragging the supporting plate 6 with the PCB placed on to flow on the first assembly line rack 1 through the first conveying belt 2;

s3, cleaning a supporting plate: in the step S2, the plurality of pallets 6 with the PCBs placed thereon are sequentially supported and transferred in the PCB surface non-contact cleaning device 4 by dragging of the first conveyor belt 2, and the PCB surfaces of the plurality of pallets 6 sequentially placed thereon are cleaned by the PCB surface non-contact cleaning device 4;

s4, shunt test: the cleaned supporting plates 6 in the step S3 are subjected to shunt test, when the plurality of cleaned supporting plates 6 move in sequence, two adjacent supporting plates 6 are conveyed in a shunt mode through the traversing device 5, so that two adjacent supporting plates 6 provided with PCBs are subjected to shunt transfer through the traversing device 5, the two adjacent supporting plates 6 provided with PCBs respectively flow into the first test station 12 and the second test station 11, and the PCBs are subjected to shunt test through a plurality of groups of PCB floating test devices on the first test station 12 and the second test station 11, so that the test efficiency and the test speed are improved;

s5, doubling and conveying: the supporting plate 6 which is tested in the step S4 and is provided with the PCB is subjected to doubling transfer, so that the supporting plate 6 which is tested in the first testing station 12 and is provided with the PCB and the supporting plate 6 which is tested in the second testing station 11 and is provided with the PCB are combined on the first assembly line rack 1 for doubling conveying; so as to be convenient for uniform pickup in the later period.

S6, moving out the PCB: carrying out PCB moving-out on the supporting plate 6 which is provided with the PCB and is conveyed in the doubling step S5, and picking and stacking the PCB on the supporting plate 6 through the placing circulating device 10;

s7, circularly feeding the supporting plates: the pallet 6 taken out of the PCB in step S6 is transferred to the return rack 18 by the shuttle lifting device 14, and transferred to the left side of the first line rack 1 by the return rack 18 toward the pallet taken out of the PCB.

Example 2

Referring to fig. 1, fig. 2, and fig. 6 to fig. 14, the present embodiment has the same points as embodiment 1, and the same points are not described again in the present embodiment, specifically, the differences are as follows:

the PCB contactless cleaning device comprises a first assembly line frame 1 and a second assembly line frame 7 which are arranged on the side edge of the first assembly line frame 1 in parallel, wherein the top end face of the first assembly line frame 1 is a horizontal plane, the middle part of the top end of the first assembly line frame 1 is a hollow structure, first conveying belts 2 are symmetrically arranged on the front side and the rear side of the top end of the first assembly line frame 1, a supporting plate 6 is arranged on the top end of the first assembly line frame 1, a plurality of PCB boards are arranged at equal intervals on the top end of the supporting plate 6 according to a matrix, the supporting plate 6 is arranged on the first conveying belts 2 on the front side and the rear side of the top end of the first assembly line frame 1, the first conveying belt 2 on each side is a flat belt, and the first conveying belt;

the discharging rack 3 is fixedly installed on the left side of the first assembly line rack 1, the PCB contactless cleaning device 4 is fixedly installed in the middle of the top end of the first assembly line rack 1, the first testing station 12 is fixedly installed in the middle of the first assembly line rack 1, the first testing station 12 is arranged on the right side of the PCB contactless cleaning device 4 at the top end of the first assembly line rack 1, and the placing circulating device 10 is fixedly installed on the right side of the first assembly line rack 1;

the second assembly line rack 7 is arranged on the side edge of the middle part of the first assembly line rack 1 in parallel, the second assembly line rack 7 is positioned on the right side of the PCB board non-contact cleaning device 4 on the side edge of the first assembly line rack 1, the middle part of the top end of the second assembly line rack 7 is also of a vacant structure, the front side and the rear side of the top end of the second assembly line rack 7 are symmetrically provided with second conveying belts 8, the left side and the right side of the second assembly line rack 7 are symmetrically provided with transverse moving devices 5, the second assembly line rack 7 transfers the supporting plate 6 flowing on the first assembly line rack 1 to the second assembly line rack 7 through the transverse moving devices 5 on the left side and the right side, and the supporting plate of the second assembly line rack 7 circularly;

a second testing station 11 is fixedly installed at the top end of the middle part of the second assembly line frame 7, and a plurality of groups of PCB floating testing devices with the same structure as the first testing station 12 are fixedly installed on the second testing station 11;

referring to fig. 6 and 8, the PCB board non-contact cleaning device 4 includes a lifting base 402 fixedly installed on the top end of the bottom support platform 17, the lifting base 402 is installed above the first assembly line frame 1, four corners of the bottom end of the lifting base 402 are provided with support legs 405, the lifting base 402 is supported and installed above the first assembly line frame 1 through the support legs 405, the bottom end of the lifting base 402 is provided with a fourth lifting table 407 capable of lifting, the top end of the lifting base 402 is fixedly installed with a fourth electric push rod 401, the fourth electric push rod 401 extends downwards to form a push rod, the fourth lifting table 407 is fixed at the bottom end of the push rod of the fourth electric push rod 401, the bottom end of the fourth lifting table 407 is symmetrically provided with infrared laser correlation sensors a414 near the left and right sides of the fourth lifting table 407, and an infrared laser correlation sensor B430 is arranged below the fourth lifting table 407 in a hollow area of the first assembly line frame 1;

a plurality of first blowing devices 412 are fixedly installed at the bottom end of the fourth lifting platform 407 at equal intervals, a second blowing device 413 is fixedly installed in the hollow area of the first assembly line rack 1, and the first blowing devices 412 and the second blowing devices 413 are transversely arranged in the hollow area of the first assembly line rack 1.

Specifically, the invention performs correlation by the infrared laser correlation sensor a-414 and the infrared laser correlation sensor B430 which are symmetrical on the left and right sides of the fourth lifting table 407, and determines whether the pallet 6 accurately enters the lower part of the lifting base 402 and moves out from the lower part of the lifting base 402, specifically, when the pallet 6 blocks the correlation between the infrared laser correlation sensor a-414 and the infrared laser correlation sensor B-430 on the left side, that is, it indicates that the pallet 6 has already entered the right lower part of the lifting base 402, at this time, the first blowing device 412, the second blowing device 413 and the dust collection tray 408 start to work, perform bidirectional blowing on the top end of the pallet 6 and the bottom end of the pallet 6 by the first blowing device 412 and the second blowing device 413, clean the top end and the bottom end of the PCB by typhoon blowing, and further remove the dust deposited on the surface of the PCB, therefore, the surface cleanliness of the PCB is improved, poor contact between the test PIN 2110 and the surface of the PCB is reduced, and the test precision of the PCB is effectively improved. Until the infrared laser correlation sensors A-414 and B-430 on the left and right sides are connected and correlated, the supporting plate 6 is moved out from the lower part of the lifting base 402, and at the moment, the first blowing device 412, the second blowing device 413 and the dust collection disc 408 stop working intelligently.

Referring to fig. 6, the lifting base 402 includes suction fans 403, suction pipes 404, and suction discs 408, the suction fans 403 are symmetrically and fixedly installed on the left and right sides of the lifting base 402, a plurality of suction discs 408 are fixedly installed at the bottom end of the fourth lifting platform 407, a long block structure is set between each suction disc 408, each blowing device one 412 is disposed between two adjacent suction discs 408 at the bottom end of each suction disc 408, the top end of each suction disc 408 is fixedly installed on the suction pipe 404, and the suction pipes 404 are connected to the corresponding suction fans 403;

specifically, the dust collection discs 408 are arranged on the bottom surface of the lifting base 402 at equal intervals, and dust collection of the dust collection discs 408 is matched with typhoons blown by the first blowing device 412 and the second blowing device 413, so that when dust on the surface of the PCB is blown, the dust can be quickly sucked out through the adsorption of the dust collection discs 408, the dust blown by the typhoons is quickly far away from the surface of the PCB, the blown dust is prevented from falling onto the surface of the PCB again, and the cleanness of the surface of the PCB is effectively improved.

Referring to fig. 8 and 14, a plurality of pressing rods 409 standing upright at the bottom end of the lifting base 402 are symmetrically arranged at the left and right sides of the bottom end of the lifting base 402, two adjacent pressing rods 409 are used in groups, the bottom end of each pressing rod 409 is rotatably connected with a pressing roller 410, each pressing roller 410 is arranged in a disc structure, two pressing rollers 410 in the same row at the left and right sides of the lifting base 402 synchronously rotate through a pressing belt 411, and the pressing belt 411 is arranged in a flat belt.

Specifically, the rotatable pressing belt 411 is arranged at the bottom end of the lifting base 402, and the pressing belt 411 slightly presses the surface of each PCB at the top end of the supporting plate 6, so that the PCBs can be effectively prevented from floating when the first blowing device 412 and the second blowing device 413 blow table wind on the surfaces of the PCBs, and dust blown out by the first blowing device 412 and the second blowing device 413 enters the explosion-proof filtering system through the air suction pipeline 404. The explosion-proof filtering system filters dust cleaned from the PCB, and reduces the toxicity of the dust adsorbed on the surface of the PCB. And the PCB is cleaned in a non-contact manner.

Wherein, the explosion-proof filtering system is the filtering technology which is disclosed in the prior art, and the device and the system for filtering dust and dust which are disclosed in the prior art are provided, therefore, the details are not described in the invention,

the middle part of each pressing rod 409 is provided with a fourth pressure spring 4091, which can realize that the pressing roller 410 performs an adaptive abdication, thereby effectively improving the slight pressing on the surface of the PCB board.

Referring to fig. 6, 7, 8 and 14, a wind shielding film 419 is fixedly mounted at the bottom end of each of the pressing rods 409 at each side of the bottom end of the lifting base 402, the wind shielding film 419 is a closed annular film, a winding groove 428 is formed at the bottom end of the lifting base 402 close to the bottom end of each of the pressing rods 409 at each side, a winding shaft 429 is rotatably connected in the winding groove 428 at each side through a torsion spring, and the top end of the wind shielding film 419 extends into the winding groove 428 and the top end of the wind shielding film 419 extending into the winding groove 428 is fixedly mounted on the winding shaft 429.

Specifically, the bottom end of the lifting base 402 is covered by the wind shielding film 419, so that the outward diffusion of dust blown by the first blowing device 412 and the second blowing device 413 can be reduced, the dust suction performance of the dust suction tray 408 is improved, and the flying of dust in a workshop can be effectively reduced.

Referring to fig. 7, the second blowing device 413 includes a groove 415 formed at the top end of the second blowing device 413 and a gas receiving nozzle 406 formed at the front side of the second blowing device 413, the bottom end of the inner wall of the groove 415 is connected with a plurality of rotating frames 416 in a rotating manner at equal intervals in a straight line at equal intervals, at least two rotating blowing heads 417 are arranged on the outer circumferential surface of each rotating frame 416 at equal intervals, each rotating blowing head 417 is designed to be a cylindrical structure, and a plurality of blowing nozzles 418 are arranged on the outer circumferential surface of each rotating blowing head 417 at equal intervals;

the rotating frame 416 rotates in a circular direction along an axis vertical to the bottom surface of the blade 6, and the rotating blowing head 417 rotates in a circular direction along another axis vertically crossing the axis of the rotating frame 416.

Specifically, the invention realizes that vertical vortex air blowing is carried out on the bottom surface of the PCB and the top surface of the PCB by the circumferential rotating motion of the plurality of rotating frames 416 at the bottom end of the inner wall of the groove 415 along the axis which is vertical to the bottom surface of the supporting plate 6, the rotating air blowing is carried out by the at least two rotating air blowing heads 417 on the outer circular surface of the rotating frames 416, the rotating direction of the rotating air blowing heads 417 is the circumferential rotating motion along the other axis which is vertically staggered with the axis of the rotating frames 416, the air blowing is carried out by matching the rotating air blowing heads 417 around to rotate in the vortex air blowing process of the rotating frames 416, the air direction blown to the surface of the PCB is not fixed, and the typhoon air blowing is carried out on the surface of the PCB by different angles, so that the dust at dead corners on the surface of the PCB can be effectively removed, the cleaning of the surface of the PCB is effectively improved, and the air blowing to, in cooperation with the shielding of the wind shielding film 419, the typhoon blown out from the air blowing nozzle 418 on the outer circular surface of the rotary blowing head 417 blows out of the inner wall of the wind shielding film 419, and the flowing direction of the wind is continuously changed by the guiding of the wind shielding film 419, so that the cleaning of the surface of the PCB board is effectively improved.

Specifically, the dust on the surface of the PCB is sucked by the plurality of dust sucking discs 408, the suction force of the dust sucking discs 408 is increased by matching with the shielding of the wind shielding film 419, and because each first blowing device 412 is arranged between two adjacent dust sucking discs 408 at the bottom end of each dust sucking disc 408, the suction force is uniform, and the dust sucking discs 408 have high dust sucking efficiency and large suction force.

Because of the PCB board quality is lighter, the typhoon that clean system produced probably can make the PCB board float and break away from the layer board, damages product surface and components and parts, utilizes the gyro wheel to push down PCB board upper surface a little, can effectively prevent the product and float, has realized the stability of product transportation, and a production line realizes that the multimachine kind switches, not only saves mill's occupation of land for the customer, still improves efficiency of software testing.

Referring to fig. 10, 11 and 12, the second blowing device 413 further includes a plurality of first air inlets 421 opened in the groove 415, and each of the first air inlets 421 is communicated with the air receiving nozzle 406 at the front side of the second blowing device 413; the air connection nozzle 406 is connected to an external air source through a pipeline.

The bottom end of each rotating frame 416 is fixedly provided with a first air moving blade 420, the bottom surface of each groove 415 is provided with a circular cavity matched with the rotating frame 416 in position, the first air moving blade 420 at the bottom end of each rotating frame 416 is rotatably connected into the circular cavity at the bottom surface of each groove 415, a first air inlet channel 421 is communicated with the circular cavity at the bottom surface of each groove 415, the other end of the circular cavity communicated with the first air inlet channel 421 is communicated with a second air inlet channel 422, the middle parts of the rotating frames 416 and the first air moving blades 420 are provided with third air inlet channels 423, the second air inlet channels 422 are communicated with the third air inlet channels 423, and the other end of each third air inlet channel 423 is provided with a;

a second circular cavity is formed in each rotating frame 416 close to the outer circular surface of the rotating frame 416, a second pneumatic blade 425 is fixedly arranged at the bottom end of the rotating blowing head 417, the second pneumatic blades 425 on the rotating blowing head 417 are rotatably connected in the second circular cavity in the rotating frame 416, the other end of each fourth air inlet channel 424 is communicated with the corresponding second circular cavity, a fifth air inlet channel 426 is communicated with the other end of each second circular cavity of the rotating frame 416, a sixth air inlet channel 427 is formed in the middle of the rotating blowing head 417 and the middle of each second pneumatic blade 425, the fifth air inlet channel 426 is communicated with the sixth air inlet channel 427, a plurality of branched seventh air inlet channels 431 are arranged at the other end of each sixth air inlet channel 427, and the other end of each seventh air inlet channel 431 is communicated with the air blowing nozzle 418.

Through the above arrangement, the rotating direction of the rotating frame 416 is circularly rotated along the axis standing on the bottom surface of the supporting plate 6, and the rotating direction of the rotating blowing head 417 is circularly rotated along the other axis vertically staggered with the axis of the rotating frame 416.

The structure of the first blowing device 412 is the same as that of the second blowing device 413, and bidirectional synchronous blowing to the top end of the PCB and the bottom surface of the PCB is achieved.

The infrared laser correlation sensor a414 and the infrared laser correlation sensor B430 are used in groups, whether the supporting plate 6 enters or moves out of the upper part of the lifting base 402 is judged by the infrared laser correlation sensor a414 on the left side and the right side of the bottom end of the fourth lifting platform 407 corresponding to the infrared laser correlation sensor B430 used in groups arranged in the hollow area of the first assembly line rack 1, and the infrared laser correlation sensor a414 and the infrared laser correlation sensor B430 are SAB dual-beam infrared correlation sensors produced by new ann treasure science and technology Shenzhen limited company.

Example 3

Referring to fig. 1, fig. 2 and fig. 15 to fig. 23, the present embodiment has the same points as embodiment 1, and the same points are not described again in the present embodiment, specifically, the differences are as follows:

the multi-group PCB floating testing device comprises a first assembly line rack 1 and a second assembly line rack 7 which are arranged on the side edge of the first assembly line rack 1 in parallel, wherein the top end face of the first assembly line rack 1 is a horizontal plane, the middle part of the top end of the first assembly line rack 1 is a hollow structure, first conveying belts 2 are symmetrically arranged on the front side and the rear side of the top end of the first assembly line rack 1, a supporting plate 6 is arranged on the top end of the first assembly line rack 1, a plurality of PCBs are arranged at equal intervals on the top end of the supporting plate 6 according to a matrix, the supporting plate 6 is arranged on the first conveying belts 2 on the front side and the rear side of the top end of the first assembly line rack 1, the first conveying belt 2 on each side is a flat belt, and the;

a discharging rack 3 is fixedly installed on the left side of the first assembly line rack 1, a PCB non-contact cleaning device 4 is fixedly installed in the middle of the top end of the first assembly line rack 1, a first testing station 12 is fixedly installed in the middle of the first assembly line rack 1, and a plurality of groups of PCB floating testing devices 21 are fixedly installed on the first testing station 12; the first test station 12 is arranged on the right side of the PCB non-contact cleaning device 4 at the top end of the first assembly line frame 1, and the placement circulating device 10 is fixedly arranged on the right side of the first assembly line frame 1;

the multiple groups of PCB floating test devices 21 comprise a fifth supporting case 2102 arranged above the first assembly line rack 1, the bottom end of the fifth supporting case 2102 is fixed at the top end of a bottom supporting table 17 through four supporting legs, a fifth electric push rod 2101 is fixedly installed at the top end of the fifth supporting case 2102, a push rod extends downwards from the fifth electric push rod 2101, a fifth lifting table 2103 is fixedly installed at the bottom end of the push rod of the fifth electric push rod 2101, and a plurality of test PIN needles 2110 electrically connected with each group of PCBs arranged on the supporting plate 6 are arranged at the bottom end of the fifth lifting table 2103;

fifth blowers 2105 are symmetrically and fixedly installed on the left side and the right side of the fifth supporting case 2102, fifth exhaust devices 2104 are arranged at the bottom ends of the fifth lifting platforms 2103 at equal intervals, and the fifth blowers 2105 on the two sides of the fifth supporting case 2102 are communicated with the fifth exhaust devices 2104 at the bottom ends of the fifth lifting platforms 2103 through fifth exhaust pipes 2106; the PCB surface that connects in advance to test PIN needle 2110 sweeps in advance, makes the PCB board surface clean and tidy that test PIN needle 2110 is connected, avoids the dust to fall into the metal contact on PCB board surface, avoids the dust to influence the signal communication of test PIN needle 2110 and PCB board surface metal contact to improve the security of test, improve the degree of accuracy of test, reduce wrong recognition failure number of times, be favorable to improving efficiency of software testing.

The left side and the right side of the bottom end of the supporting plate 6 are symmetrically provided with a metal electric connection piece 601, and the two metal electric connection pieces 601 are electrically connected inside the supporting plate 6 through a conducting wire; two conductive terminals 2120 matched with the metal electric connecting piece 601 are fixedly arranged in a middle vacant area of the first assembly line rack 1, the two conductive terminals 2120 are both arranged right below the fifth supporting case 2102, and the conductive terminals are metal conductive connecting ends.

Specifically, through the sliding contact of two conductive terminals 2120 and the metal electric connection piece 601 at the bottom end of the supporting plate 6, the circuit between the two conductive terminals 2120 is switched on, a signal is sent to the flow blocking rod 2137, the flow blocking rod 2137 extends out of the upper portion of the first conveying belt 2 on two sides of the inner wall of the first assembly line rack 1, the supporting plate 6 above the first conveying belt 2 is blocked, the supporting plate 6 is conveyed through the first conveying belt 2 to be in contact with the flow blocking rod 2137, the magnetic blocks 2138 on the side wall of the flow blocking rod 2137 are matched with the iron sheet on the right side of the supporting plate 6, the position of the supporting plate 6 is fixed, and then the position of the supporting plate 6 is locked, so that the contact accuracy of the test PIN 2110 to the metal contact on the surface of the PCB is improved, the outward inclination of the connection of the test PIN 2110 to the metal.

The two sides of the inner wall of the top end of the first assembly line rack 1 are symmetrically provided with the flow blocking rods 2137, the flow blocking rods 2137 on the two sides of the inner wall of the first assembly line rack 1 are arranged on the right side of the conductive terminal 212, and the flow blocking rods 2137 on each side are positioned above the first conveying belt 2 on the two sides of the inner wall of the first assembly line rack 1;

a magnet 2138 is fixedly arranged on the left side wall of the flow blocking rod 2137, an iron sheet corresponding to the magnet 2138 is arranged on the right side of the supporting plate 6, wherein, the choke bar 2137 is an axial retractable device, and a delay power-off device is arranged inside the choke bar 2137, so that when the circuit between the two conductive terminals 2120 is switched on, the signal is sent to the flow blocking rods 2137, the flow blocking rods 2137 extend out of the upper parts of the first conveying belts 2 on the two sides of the inner wall of the first assembly line frame 1, at the moment, the supporting plate 6 moves above the first conveying belt 2, at the moment, the two conductive terminals 2120 are disconnected from the metal electric connecting piece 601 at the bottom end of the supporting plate 6, because the flow blocking rod 2137 is internally provided with the delayed power-off device, the flow blocking rod 2137 can automatically retract to the inner wall of the first assembly line rack 1 after delaying for 10 seconds, while the 10 seconds of delay is sufficient for the test PIN 2110 to make contact with the PCB board surface metal contacts and complete the on-line testing of the PCB board. After 10 seconds, the flow blocking rods 2137 can automatically retract into the inner wall of the first assembly line rack 1 to give way for the support plate 6 to move rightwards, and then after the flow blocking rods 2137 retract into the inner wall of the first assembly line rack 1, the support plate 6 moves rightwards without obstruction, and then the movement can be continued to the next process.

In addition, the choke rod 2137 of the present invention may be a commercially available electric push rod, or any device capable of axially extending and retracting may be used to complete the blocking and releasing of the supporting plate 6 instead of the choke rod 2137 of the present invention.

Three layers of test boards are sequentially arranged at the bottom end of the fifth lifting platform 2103 upwards, and each layer of test board is a horizontally arranged thin plate;

the test board at the bottommost layer is a fixed test board 2116 fixed at the bottom of the fifth lifting platform 2103, the fixed test board 2116 is parallel to the bottom end of the fifth lifting platform 2103, and the bottom end of the fixed test board 2116 is provided with a test PIN needle 2110 standing upright at the bottom end of the fixed test board 2116;

the test board in the middle layer is a first floating test board 2117 arranged above the fixed test board 2116, the first floating test board 2117 can reciprocate above the fixed test board 2116, the top end of a fifth lifting platform 2103 is fixedly provided with two first electric push rods 2107, the two first electric push rods 2107 are arranged on the left side and the right side of the first floating test board 2117, the first electric push rod 2107 on each side extends downwards to form a first push rod 2109, the bottom end of the first push rod 2109 of the first electric push rod 2107 on each side is fixed on the first floating test board 2117, and the bottom end of the first floating test board 2117 is provided with a test PIN 2110 standing upright at the bottom end of the first floating test board 2117;

the top test board is a second floating test board 2118 arranged above the first floating test board 2117, the second floating test board 2118 can reciprocate above the first floating test board 2117, a second electric push rod 2121 is fixedly arranged in the middle of the top end of the fifth lifting platform 2103, a push rod extends downwards from the second electric push rod 2121, the bottom end of the push rod of the second electric push rod 2121 is fixed on the top surface of the second floating test board 2118, and a test PIN 2110 standing upright at the bottom end of the second floating test board 2118 is arranged at the bottom end of the second floating test board 2118;

the test PIN 2110 at the bottom of the fixed test plate 2116, the test PIN 2110 at the bottom of the first floating test plate 2117 and the test PIN 2110 at the bottom of the second floating test plate 2118 are different in length, the test PIN 2110 at the bottom of the fixed test plate 2116 is shortest, and the test PIN 2110 at the bottom of the second floating test plate 2118 is longest.

Specifically, the invention realizes the on-line test of one program on a plurality of PCB boards at the same time by controlling the test PIN 2110 at the bottom surface of the fixed test board 2116 to contact with the metal contacts on the surfaces of a plurality of PCB boards on the lower supporting plate 6 by the lifting of the fifth lifting table 2103, the test PIN 2110 at the bottom end of the first floating test board 2117 is contacted with other metal contacts on the surfaces of the PCB boards by the lifting of the first floating test board 2117 to realize the on-line test of the other program, the test PIN 2110 at the bottom end of the second floating test board 2118 is contacted with other metal contacts on the surfaces of the PCB boards by the lifting of the second floating test board 2118 to realize the on-line test of the other programs, the invention can realize the switching of different programs by the second floating test board 2118, the first floating test board 2117 and the test PIN 2110 under the fixed test board 2116, thereby being capable of carrying out the on-line test of different programs on the PCB with different structures,

according to the invention, the plurality of PCB boards are placed at the top end of the supporting plate 6, so that the plurality of PCB boards can be synchronously tested. The test efficiency of the surface of the PCB is improved.

Each test PIN 2110 comprises a sixth pressure spring 2122, a sixth pressure spring groove 2123, a floating thimble 2125, an arc-shaped elastic sheet 2126 and a bent elastic sheet 2127, the test PIN 2110 is of a round rod structure, the sixth pressure spring groove 2123 is formed in the middle of the bottom end of the test PIN 2110, the floating thimble 2125 is installed in the sixth pressure spring groove 2123 at the bottom end of the test PIN 2110 in a sliding fit mode, the sixth pressure spring 2122 is fixedly installed at the top end of the floating thimble 2125 embedded in the sixth pressure spring groove 2123, the bottom end of the floating thimble 2125 extends out of the bottom end of the test PIN 2110, the floating thimble 2125 is of a round rod structure, and a clamping groove is formed in the outer circular surface of the floating thimble 2125 close to the bottom end;

a plurality of bent arc-shaped elastic sheets 2126 are arranged on the outer circumferential surface of the bottom end of the test PIN 2110 at equal intervals, a bent elastic sheet 2127 formed by folding and bending is arranged at the bottom end of each arc-shaped elastic sheet 2126, and the bottom end of each bent elastic sheet 2127 is clamped in a clamping groove on the outer circumferential surface of the floating thimble 2125.

Specifically, the invention realizes the transmission connection of the program signal by the contact of the bottom end of the test PIN 2110 downward with the metal contact on the surface of the PCB, and because the metal contact on the surface of the PCB is inevitably attached with granular dust, the contact of the bottom end of the test PIN 2110 downward with the metal contact on the surface of the PCB is poor, the invention arranges the elastically telescopic floating thimble 2125 at the bottom end of the test PIN 2110, when the bottom end of the test PIN 2110 contacts with the metal contact and is pressed downward, the floating thimble 2125 extends into the sixth pressure spring groove 2123, at this time, the peripheral bent elastic sheet 2127 and the peripheral arc elastic sheet 2126 are driven to bend, so that the arc elastic sheet 2126 around the floating thimble 2125 is slightly dispersed outward, and the surface of the arc elastic sheet 2126 is contacted with the surface of the metal contact, so as to effectively ensure the close adhesion of the connection of the test PIN 2110 with the metal contact, the contact with multiple areas of the same metal contact can be realized by arranging the arc-shaped elastic sheets 2126, and even if one of the arc-shaped elastic sheets 2126 is in poor contact with the metal contact, and the other arc-shaped elastic sheets 2126 are in good contact with the metal contact, the stable transmission connection of effective program signals can still be kept.

According to the invention, the bent elastic sheet 2127 at the top end of the arc elastic sheet 2126 can enable the bent elastic sheet 2127 to be bent more easily, so that the elastic lifting of the floating ejector PIN 2125 is effectively reduced, and the good contact of the test PIN 2110 to the surface of a metal contact is effectively improved. The stable transmission of the program signal in the PCB online test process is improved.

The floating thimble 2125 comprises a seventh pressure spring groove 2132 arranged on the bottom surface of the bending elastic sheet 2127, two sides of the inner wall of the seventh pressure spring groove 2132 are provided with a limiting sliding groove 2131 parallel to the axis of the seventh pressure spring groove 2132, a floating metal head 2128 with a round bar structure is arranged in the seventh pressure spring groove 2132 in a sliding fit manner, a convex seventh sliding block 2133 is arranged on the outer circumferential surface of the floating metal head 2128 embedded in the floating metal head 2128 in a sliding fit manner, the seventh sliding block 2133 on the outer circumferential surface of the floating metal head 2128 is in sliding connection with the limiting sliding groove 2131 on the inner wall of the seventh pressure spring groove 2132, and a seventh pressure spring 2139 is fixedly arranged at the top end of the floating metal head 2128 embedded in the seventh pressure spring groove 2132, so that the floating metal head 2128 can only slide back and forth in the axial direction of the seventh pressure spring groove 2132.

The top end of the floating thimble 2125 is rotatably connected with a rotating flange 2135 along the outer circular surface of the floating metal head 2128, the rotating flange 2135 is of a cylindrical structure, and a plurality of contact steel balls 2134 are arranged on the bottom end surface of the rotating flange 2135 at equal intervals;

a through round hole is formed in the middle of the rotating flange 2135, the round hole in the middle of the rotating flange 2135 is sleeved on the outer circular surface of the floating metal head 2128, a raised guide pin 2130 is arranged on the inner wall of the round hole of the rotating flange 2135, a recessed guide chute 2129 is formed in the outer circular surface of the floating metal head 2128, the guide chute 2129 is of an S-shaped structure, and the guide pin 2130 on the inner wall of the round hole of the rotating flange 2135 is slidably connected into the guide chute 2129.

Specifically, when the floating metal head 2128 makes the test PIN 2110 contact with the surface of the metal contact, the floating metal head 2128 is pressed to move axially up and down towards the seventh pressure spring groove 2132, during the axial lifting process of the floating metal head 2128, the guide sliding grooves 2129 on the outer circular surface of the floating metal head 2128 push the guide PINs 2130 and the rotating flange 2135 to rotate, and further when the floating metal head 2128 is in poor contact with the surface of the metal contact, the rotating flange 2135 rotates back and forth on the surface of the metal contact, the rotating flange 2135 makes good contact with the surface of the metal contact, and the good contact of the test PIN 2110 with the surface of the metal contact can still be maintained. The invention effectively improves the stable transmission of program signals in the process of testing the PCB on line, and reduces the friction of the bottom surface of the rotating flange 2135 to the surface of the metal contact through the contact steel balls 2134 when the bottom surface of the rotating flange 2135 rotates on the surface of the metal contact by arranging the plurality of contact steel balls 2134 on the bottom end surface of the rotating flange 2135, thereby avoiding the scratch to the surface of the metal contact in the testing process and improving the safety of the test.

Multiple rows of fifth pinch roller support legs 2114 erected at the bottom end of the fifth lifting platform 2103 are symmetrically arranged on the left side and the right side of the bottom end of the fifth lifting platform 2103, a second-stage pressure spring 2115 is arranged in the middle of each fifth pinch roller support leg 2114 on each side, the bottom end of each row of fifth pinch roller support legs 2114 is rotatably connected with a fifth pinch roller 2113, a fifth pinch belt 2111 is connected between each row of corresponding fifth pinch rollers 2113 on the two sides, and the fifth pinch belt 2111 is a flat belt.

Specifically, the surfaces of the multiple PCB boards at the top ends of the supporting plates 6 are slightly compressed through the fifth compression wheels 2113 and the fifth compression belts 2111, so that the PCB boards are prevented from floating when the test PIN 2110 contacts the surfaces of the PCB boards, and good contact between the test PIN 2110 and metal contacts on the surfaces of the PCB boards is improved.

A plurality of spring grooves are symmetrically formed in the left side and the right side of the bottom end of the fifth lifting platform 2103, the top end of each fifth pinch roller supporting leg 2114 extends into the spring groove corresponding to the bottom end of the fifth lifting platform 2103 through sliding connection, a fifth pressure spring 2108 is fixedly mounted at the top end of the fifth pinch roller supporting leg 2114 embedded in the spring groove, and therefore the fifth pinch roller 2113 can be elastically abducted on the surface of the PCB effectively, and the pressing efficiency of the surface of the PCB is improved.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a multiunit PCB board testing arrangement that floats, includes an assembly line frame to and set up side by side in No. two assembly line frames of an assembly line frame side, its characterized in that: the top end face of the first assembly line rack is a horizontal plane, the middle part of the top end of the first assembly line rack is of a hollow structure, first conveying belts are symmetrically arranged on the front side and the rear side of the top end of the first assembly line rack, a supporting plate is placed on the top end of the first assembly line rack, a plurality of PCB boards are arranged on the top end of the supporting plate at equal intervals according to a matrix, the supporting plate is placed on the first conveying belts on the front side and the rear side of the top end of the first assembly line rack, the first conveying belt on each side is a flat belt, and the first conveying belt on each side is provided with an independent first servo motor drive;

2. The multi-set PCB board floating test device of claim 1, wherein: three layers of test boards are sequentially arranged at the bottom end of the fifth lifting platform upwards, and each layer of test board is a horizontally arranged thin plate;

3. The multi-set PCB board floating test device of claim 2, wherein: each test PIN needle comprises a sixth pressure spring, a sixth pressure spring groove, a floating thimble, an arc-shaped elastic sheet and a bent elastic sheet, the test PIN needle is of a round bar structure, the sixth pressure spring groove is formed in the middle of the bottom end of the test PIN needle, the floating thimble is installed in the sixth pressure spring groove at the bottom end of the test PIN needle in a sliding fit mode, the sixth pressure spring is fixedly installed at the top end of the floating thimble embedded in the sixth pressure spring groove, the bottom end of the floating thimble extends out of the bottom end of the test PIN needle, the floating thimble is of a round bar structure, and a clamping groove is formed in the outer circumferential surface of the floating thimble close to the bottom end;

4. The multi-set PCB floating test device of claim 3, wherein: the floating thimble comprises a seventh pressure spring groove arranged on the bottom surface of the bent elastic sheet, two sides of the inner wall of the seventh pressure spring groove are provided with limiting chutes parallel to the axis of the seventh pressure spring groove, a floating metal head with a round bar structure is arranged in the seventh pressure spring groove in a sliding fit manner, a convex seventh sliding block is arranged on the outer circular surface of the floating metal head embedded in the floating metal head in a sliding fit manner, and the seventh sliding block on the outer circular surface of the floating metal head is in sliding connection with the limiting chutes on the inner wall of the seventh pressure spring groove;

5. The multi-set PCB floating test device of claim 4, wherein: the top end of the floating thimble is rotatably connected with a rotating flange along the outer circular surface of the floating metal head, the rotating flange is of a cylindrical structure, and a plurality of contact steel balls are arranged on the bottom end surface of the rotating flange at equal intervals;

6. The multi-set PCB board floating test device of claim 1, wherein: the left side and the right side of the bottom end of the fifth lifting table are symmetrically provided with a plurality of rows of fifth pinch roller support legs which are erected at the bottom end of the fifth lifting table, a second-stage pressure spring is arranged in the middle of each fifth pinch roller support leg on one side, the bottom end of each row of fifth pinch roller support legs is rotatably connected with a fifth pinch roller, and a fifth pinch belt is connected between the corresponding fifth pinch rollers on two sides.

7. The multi-set PCB board floating test device of claim 1, wherein: the fifth compression belt is a flat belt.

8. The multi-set PCB floating test device of claim 6, wherein: a plurality of spring grooves are symmetrically formed in the left side and the right side of the bottom end of the fifth lifting platform, the top end of each fifth pinch roller supporting leg extends into the spring groove corresponding to the bottom end of the fifth lifting platform through sliding connection and is embedded into the spring groove, and a fifth pressure spring is fixedly installed at the top end of each fifth pinch roller supporting leg.