Circuit board placing rack

Abstract

A circuit board placing rack belongs to the technical field of circuit board storage equipment and comprises a turnover part, a moving part is arranged at the upper end of the turnover part, a plurality of placing parts are arranged on the moving part in the length direction of the moving part, an interlocking part is arranged on the turnover part, and the interlocking part is connected to the moving part and used for moving and locking the moving part. According to the glue removing device for the circuit boards, the circuit boards can be limited by arranging the clamping mechanisms capable of clamping the two sides of the circuit boards, when glue removing operation is conducted on the circuit boards with the small thickness, the circuit boards can be conveniently placed on the circuit boards, and the circuit boards can be conveniently placed on the circuit boards. And the circuit board is prevented from being scratched or abraded due to deformation or shaking of the circuit board. According to the invention, the circuit board can be conveniently placed or taken out by arranging the opening and closing connecting piece.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board storage devices, and particularly to a circuit board placement rack. Background Art

[0002] In the processing of printed circuit boards, drilling and hole metallization are very important processes. They penetrate different circuit layers of the circuit board, and the quality of drilling and hole metallization plays a great role in the reliability of the printed circuit board. Whether it is mechanical drilling or laser drilling, there will be drilling residues and dust in the holes after drilling, which will affect the quality of subsequent hole metallization. In order to completely remove the drilling residues and dust, plasma cleaning equipment is often used nowadays. In the plasma cleaning equipment, the placement rack for printed circuit boards is a key component. The current mainstream placement rack adopts a double-layer structure of "mobile cart + sliding rack body": the mobile cart undertakes the mission of carrier transportation, and the rack body is like a "berthing port" for precisely arranged circuit boards, and the plate body is limited on both sides by the trough-shaped parts distributed up and down. Among them, the design of the adjustable slide rail and screw locking of the top trough-shaped part not only meets the compatibility requirements of different size plates, but also can form a rigid constraint after positioning.

[0003] However, such a placement rack structure has relatively large defects in actual production: First, the operator manually inserts the circuit boards into the placement rack. The spacing between the circuit boards on the placement rack is very close. During the placement process, it is very easy to have collisions between the boards, causing scratches on the board surface and resulting in the scrapping of the circuit board. Second, the gap between the inner walls of the trough of the placement rack is fixed. It can form a tight bite for thick boards, but for thin boards, the printed circuit board is very easy to bend and deform, causing the boards to overlap each other, affecting the effect of plasma cleaning. Summary of the Invention

[0004] The present invention provides a circuit board placement rack to solve the above-mentioned deficiencies of the prior art, solve the problems of inconvenient placement and retrieval of circuit boards, and the shaking of circuit boards with smaller thickness dimensions due to poor limiting effect, and ensure the stability of the connection between the transfer cart and the rack body.

[0005] In order to achieve the purpose of the present invention, the following technologies are proposed: A circuit board placement rack includes a turnover part. A moving part is provided at the upper end of the turnover part. A plurality of placement parts are arranged along the length direction on the moving part. A locking part is provided on the turnover part. The locking part is connected to the moving part and is used for locking the movement of the moving part. The turnover part facilitates the transfer of the placement parts after placement, and the placement parts provided on the moving part can place a plurality of circuit boards. In addition, the moving part is movably arranged on the turnover part to facilitate the placement and detachment before and after transfer. When the moving part and the turnover part are connected, the moving part can be locked by the locking part to prevent the moving part and the placement parts thereon from moving, thereby ensuring the safety and stability during transfer.

[0006] The placement part includes a pair of vertical connecting pieces. A pair of clamping mechanisms are provided on the vertical connecting pieces. The clamping mechanisms are distributed vertically. The clamping mechanism located at the upper end is movably arranged on the vertical connecting piece, and the clamping mechanism located at the lower end is fixed to the lower end of the vertical connecting piece. An opening and closing connecting piece is provided on the clamping mechanism located at the lower end, and the opening and closing connecting piece is arranged on the moving part. Through the placement part composed of the above-mentioned components, it can fix both sides of the circuit board through the clamping mechanism. If the circuit board is relatively thin, it first clamps the circuit board and then applies a pulling force to the circuit board in the vertical direction to make the circuit board in a tensioned state, so as to ensure that the circuit board will not be deformed. If the circuit board is relatively thick, it fixes both ends of the circuit board by squeezing from both sides. Through the above method, the placement part can adapt to the placement of circuit boards with different thicknesses, and can also prevent thin circuit boards from deforming. The opening and closing connecting piece plays a connecting role at the lower end of each placement part, connecting the placement part to the moving part. When placing or taking out the circuit board, the connection can be cancelled to facilitate the taking out or placing of the circuit board on the placement part.

[0007] Further, the turnover part includes a rectangular bottom frame, which is fixed by four aluminum profiles and multiple corner codes. A pair of end fixing plates are respectively installed at both ends of the rectangular bottom frame by screws, and the end fixing plates also play a role in connecting and fixing the aluminum profiles. Universal wheels are installed on the end fixing plates by bolts. A pair of vertical rods are respectively installed at both ends of the rectangular bottom frame by screws. A rectangular top frame is installed at the upper end of the vertical rod. Multiple handles are installed on the outer side of the rectangular top frame. The purpose of setting multiple handles is mainly to facilitate the transfer operation of the turnover part. A middle rod is installed inside the rectangular top frame by bolts, and a pair of guide rails are installed at the upper end of the rectangular top frame. The length direction of the guide rails is parallel to the length direction of the rectangular top frame.

[0008] Further, the moving part includes a pair of rectangular tubes. The length direction of the rectangular tubes is parallel to the length direction of the rectangular top frame. End concave parts are installed at both ends of the rectangular tubes by bolts. Multiple holding holes are provided on the end concave parts. Multiple outer extension shafts are fixed to the outer wall of the rectangular tubes. Specifically, an inner disc is welded to the inner side end of the outer extension shaft, and multiple connecting screws are welded to the inner disc. The connecting screws are inserted into the rectangular tubes, and a pressing nut is threadedly connected to the inner side end of the connecting screw. The outer side end of the pressing nut acts on the inside of the rectangular tubes. A pulley is rotatably arranged on the outer extension shaft, and a pulley limiting ring is fixed to the outer extension shaft by means of a pin or threaded connection to ensure the stability after the pulley is connected. A ring groove is provided on the outer circumference of the pulley. The pulley is slidably arranged on the guide rail, and the bottom of the ring groove is tangent to the upper end of the guide rail. The setting of the guide rail and the pulley can significantly improve the convenience and flexibility of the moving part when moving.

[0009] Further, the linkage part includes a pair of guide rods threaded through the middle rod. The upper ends of the guide rods are connected with concave fasteners by threads. The concave fasteners are buckled on the middle rod. The concave structure design of the concave fasteners creates convenience for the connection and fixation operation of the guide rods. A limit ring is connected to the guide rod by a pin. The limit ring is located below the middle rod. The limit ring and the concave fastener cooperate with each other to stably fix the guide rod. The lower end of the guide rod is provided with an end cap. A cross plate is movably arranged on the guide rod. A first spring is sleeved on the guide rod. The first spring is located between the end cap and the cross plate. End arms are formed at both ends of the cross plate. The length direction of the end arms is perpendicular to the length direction of the cross plate. A plurality of clamping plates are installed on the cross plate. A U-shaped clamping groove is formed at the upper end of the clamping plate. When the linkage part limits the movement part, the outer extension shaft is clamped in the U-shaped clamping groove, and the first spring is in a natural elongation state. In this way, the connection stability between the turnover part and the movement part can be improved to avoid safety accidents during transfer. When canceling the connection, it can be achieved by pulling down the cross plate.

[0010] Further, a pair of lifting seats are installed on the lower wall of the horizontal plate by screws. Oblique holes are formed in the lifting seats. There is an included angle between the length direction of the oblique holes and the vertical direction. A middle block is movably arranged between the lifting seats. Pressing rods are rotatably arranged at both ends of the middle block. The pressing rods pass through the oblique holes. Optionally, pressing wheels are rotatably arranged at the outer ends of the pressing rods. When the pressing wheels move in the oblique holes, the friction between the pressing rods and the oblique holes can be reduced, so as to facilitate the downward movement of the clamping plate through the movement of the middle block. A pair of connecting rods are connected to the middle block by threads. Nuts are connected to the connecting rods by threads. End seats are sleeved on the connecting rods. The upper ends of the end seats are installed at one end of the rectangular top frame by screws. A pair of guide sleeves are welded on the inner sides of the end seats. The connecting rods pass through the guide sleeves to restrict and guide the pulling movement of the connecting rods. End caps are connected to the guide sleeves by threads. The connecting rods pass through the end caps. Second springs are sleeved on the connecting rods. The second springs are located between the nuts and the end caps. During the natural elongation process of the second springs, the clamping plate can be connected to the outer extension shaft. The outer ends of the connecting rods are connected to concave pulling parts by threads. The concave pulling parts are located outside the end seats. Outer pulling rods are rotatably arranged on the concave pulling parts. Swing arms are fixed to both ends of the outer pulling rods by splines. It can be known that the outer ends of the outer pulling rods are connected to swing arm limit nuts by threads. The connection effect between the outer pulling rods and the swing arms can be improved through the swing arm limit nuts. Connecting end rods are arranged on the outer sides of the other ends of the swing arms. A pair of side plates are formed on both sides of the end seats. Notches are formed at the upper ends of the side plates in an open manner. When the outer extension shaft is disconnected from the U-shaped card slot, the connecting end rods pass through the notches. When the concave pulling parts are in the outer pulling state, the provided swing arms and the connecting end rods thereon lock this state, so as to facilitate the operator to place or take out the moving part. Limiting convex plates are welded or connected to the outer circumference of the outer pulling rods by pins. A baffle is welded on the concave pulling parts. When the connecting end rods pass through the notches, the baffle is used for rotational limiting of the limiting convex plates. This design method can limit the rotation angle of the swing arms. And when the connection between the clamping plate and the outer extension shaft is cancelled, due to the blocking effect of the baffle on the limiting convex plates, the swing arms are in a horizontal posture. A pair of L-shaped arms are installed on the end seats by screws. Holding rods are fixed to the ends of the L-shaped arms by a pair of nuts. The holding rods and the outer pulling rods are in the same plane. Through this design method, it is convenient for the operator to make the outer pulling rods approach the holding rods by holding and tightening. And the design of the holding rods also facilitates the connection and removal operations between the moving part and the turnover part.

[0011] Further, the clamping mechanism includes a channel-shaped member. A middle shaft is welded at the middle position of the channel-shaped member. A spreading plate is rotatably provided on the middle shaft. The spreading plate has a long strip structure. The two sides of the spreading plate along its width direction are flat surfaces, and the two ends of the spreading plate along its length direction are arc surfaces. The arc surfaces at both ends of the spreading plate are in a rotationally symmetric relationship. The center of the arc surface deviates from the geometric center position of the spreading plate, so that the two ends of the spreading plate are in a wedge-shaped structure. A holding block is formed at the outer end of the spreading plate, which is convenient for rotating the spreading plate. A pair of outer pressing wheels are tangent to the outer periphery of the spreading plate. When the spreading plate rotates, when the outer pressing wheels are tangent to the flat surface, the distance between the outer pressing wheels is the smallest. When the outer pressing wheels are tangent to the outer periphery of the arc surface, it will gradually move the two outer pressing wheels outward. The setting of the arc surface can improve the smoothness during rotation and avoid the problem of jamming during rotation. The outer pressing wheels are located on both sides of the spreading plate, and a connecting shaft is provided on the outer pressing wheel.

[0012] A fixed seat is installed on the channel-shaped member. A pair of guide pins are connected to the fixed seat by threads. A limit cap is provided at the inner end of the guide pin. A movable plate is sleeved on the guide pin. The limit cap is located inside the movable plate to prevent the guide pin and the movable plate from being disconnected. A third spring is sleeved on the guide pin. The third spring is located between the movable plate and the fixed seat. When the outer pressing wheel is tangent to the flat surface of the spreading plate, it can make the movable plate move inward under the elastic force of the third spring. A concave movable plate is welded on the movable plate. Rotating seats are installed at both ends of the concave movable plate by screws. An inner pressing wheel is rotatably provided at the inner end of the rotating seat. A push-pull arm is welded inside the concave movable plate. The connecting shaft is rotatably provided at the inner end of the push-pull arm. A pair of clamping plates are provided inside the channel-shaped member. An outer protruding plate is provided on the outer wall of the clamping plate. The outer protruding plate penetrates through both sides of the channel-shaped member. A slope is formed at the outer end of the outer protruding plate. The inner end of the slope extends inward obliquely. The outer periphery of the inner pressing wheel is tangent to the outer end of the outer protruding plate. The design of the slope creates conditions for the outer protruding plate to move inward. A compression spring is fixed between both ends of the clamping plate. When the distance between the outer pressing wheel and the middle shaft changes, it can make the inner pressing wheel move. The distance between each pair of inner pressing wheels is constant. Then when it moves, it will make the outer protruding plate move inward or outward. When the outer protruding plate moves inward, it can clamp both sides of the circuit board through the clamping plate. If the inner pressing wheel cancels the action on the outer protruding plate, the clamping plate can open under the elastic force of the compression spring, so as to facilitate the placement of the circuit board.

[0013] Further, in order to lock the rotation angle of the spreading plate, a spreading plate tightening nut can be connected to the outer end of the middle shaft by threads to fix the spreading plate. Optionally, a ratchet can also be provided on the spreading plate and a ratchet pawl and a torsion spring can be provided on the channel-shaped member, etc. The rotation angle of the spreading plate can be limited by the limiting action of the ratchet pawl on the ratchet to ensure the stability of the clamping of the circuit board by the clamping plate.

[0014] Further optionally, the rotation of the support plate can be limited in the following manner: the middle through shaft includes an inner shaft welded to the middle position of the groove-shaped member, a spline shaft is formed at the outer end of the inner shaft, a screw is provided at the outer end of the spline shaft, and an end nut is threadedly connected to the screw.

[0015] The spline shaft is sleeved with a spline sleeve, the outer end of the spline sleeve is provided with an end plate, the inner wall of the end plate is provided with a plurality of wedge-shaped protrusions in a circumferential array, and an inclined surface is formed on one side of the inner end of the wedge-shaped protrusion. The spline shaft is sleeved with a fourth spring, and the fourth spring is located between the end nut and the end plate. A positioning rod is provided on the outer periphery of the spline sleeve perpendicular to its axial direction. A locking ring is provided on the holding block, and at least one pair of rotationally symmetrical embedded grooves is provided on the locking ring. One side of the embedded groove is a vertical plane, and the other side of the embedded groove is an outer top inclined surface. A plurality of bayonet holes are formed at the outer end of the embedded groove. The outer top inclined surface acts on the inclined surface to move the positioning rod out of the bayonet hole. When the wedge-shaped protrusion passes through the embedded groove, the positioning rod is clamped in the bayonet hole.

[0016] If the above method is used to lock the rotation angle of the support plate, the positioning rod can be clamped in the bayonet to achieve the locking purpose, and the wedge-shaped protrusion and the embedded groove can also be used as limiting components. At the same time, this limiting locking method will not affect the rotation of the support plate, and locking can be achieved during the rotation process.

[0017] Furthermore, the vertical connecting member includes a pair of lower end blocks, which are installed on the groove-shaped member on the clamping mechanism at the lower end by screws, a vertical plate is welded on the lower end block, an upper end block is welded on the upper end of the vertical plate, a concave member is installed between the upper end blocks by screws, a sliding sleeve is sleeved on the vertical plate, and the sliding sleeve is installed on the groove-shaped member on the clamping mechanism at the upper end by screws, a rotating convex portion is formed on the inner side of the sliding sleeve, an inner pressure shaft is rotatably provided on the rotating convex portion, and eccentric pressure wheels are eccentrically provided at both ends of the inner pressure shaft, the outer periphery of the eccentric pressure wheel is pressed against the outer wall of the narrow side of the vertical plate, a holding end rod is welded on the inner pressure shaft perpendicular to the axial direction thereof, and the axial direction of the holding rod and the line connecting the center of the eccentric pressure wheel and the center of the inner pressure shaft are in a perpendicular relationship. When positioning the clamping mechanism at the upper end, locking can be achieved by simply rotating the eccentric pressure wheel, which has the advantage of convenient operation compared to the existing screw locking.

[0018] Furthermore, the opening and closing connecting piece includes a rotating convex plate welded on one of the rectangular tubes, a hinge shaft is provided on the upper end of the rotating convex plate, a rotating recess is rotatably provided on the hinge shaft, the rotating recess is mounted on one end of a groove-shaped piece on the clamping mechanism at the lower end by a screw, the placement part and the moving part are connected together by the hinge shaft, and when the circuit board is taken out or placed, the placement part can be rotated outward, thereby reducing the difficulty of taking out or placing the circuit board.

[0019] Another rectangular pipe is welded with a connecting convex plate. A clamping shaft is provided at the upper end of the connecting convex plate. A concave clamping seat is sleeved on the upper end of the connecting convex plate. An inward concave arc groove is formed at the lower end of the concave clamping seat. The clamping shaft penetrates through the inward concave arc groove. The concave clamping seat is installed on the other end of a channel-shaped part on the clamping mechanism located at the lower end through screws. The other end of the placing part can be fixed by the above components.

[0020] A concave clamping part is sleeved on the lower end of the connecting convex plate. An L-shaped groove is formed on the upper wall of the concave clamping part. The clamping shaft is located in the L-shaped groove. An inner pulling plate is installed at the inner side end of the concave clamping part through screws. A pair of guiding through rods are connected to the upper end of the inner pulling plate through threads. Inner end caps are provided at the inner side ends of the guiding through rods. An inner vertical plate is sleeved on the guiding through rods. The inner end caps are located inside the inner vertical plate. The inner vertical plate is installed on the channel-shaped part on the clamping mechanism located at the lower end through screws. A fifth spring is sleeved on the guiding through rods. The fifth spring is located between the inner vertical plate and the inner pulling plate. A pull rod is connected to the inner pulling plate through threads. The other end of the pull rod is welded with an end pulling plate. An arcuate rod is welded on the end pulling plate. When the pulling force on the arcuate rod is cancelled, the elastic force provided by the fifth spring can move the concave clamping part outwards, and make it sleeved on the connecting convex plate, and hold it tightly on the clamping shaft through the L-shaped groove on it, so as to avoid the uncontrollable rotation of the circuit board and cause damage to the circuit board.

[0021] The advantages of the above technical solution are as follows: The present invention first connects the turnover part and the moving part together by setting the interlocking part, so as to ensure the safety and stability during the transfer of the circuit board.

[0022] Secondly, the present invention limits the circuit board by setting a clamping mechanism capable of clamping both sides of the circuit board. When performing the debonding operation on a circuit board with a relatively thin thickness, the circuit board is prevented from deforming or being scratched or worn due to shaking.

[0023] Finally, the present invention sets an opening and closing connecting part to facilitate the placement or removal of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings.

[0025] Figure 1 The three-dimensional structure diagram of the circuit board placement rack is shown.

[0026] Figure 2 The three-dimensional structure diagram of the turnover part is shown.

[0027] Figure 3 The connection diagram between the moving part and the interlocking part is shown.

[0028] Figure 4A three-dimensional structural diagram of the interlocking part from a first viewing angle is shown.

[0029] Figure 5 A three-dimensional structural diagram of the interlocking portion from a second viewing angle is shown.

[0030] Figure 6 A schematic diagram of the connection between the moving part and the placing part is shown.

[0031] Figure 7 A three-dimensional structural diagram of the placement portion from a first viewing angle is shown.

[0032] Figure 8 The three-dimensional structure of the placement part from the second viewing angle is shown Figure 4 .

[0033] Figure 9 A schematic diagram of the connection between the expansion plate and the central through shaft is shown.

[0034] Figure 10 A three-dimensional structural diagram of the expansion plate and its upper components is shown.

[0035] Figure 11 A three-dimensional structural diagram of the central through shaft is shown.

[0036] Figure 12 A three-dimensional structural diagram of the vertical connector, the clamping mechanism and the opening and closing connector from a first viewing angle is shown.

[0037] Figure 13 A three-dimensional structural diagram of the vertical connector, the clamping mechanism and the opening and closing connector from a second viewing angle is shown.

[0038] Figure 14 A three-dimensional structural diagram of a vertical connector is shown.

[0039] Description of reference numerals: Turnover section 1, chain section 2, moving section 3, placing section 4, clamping mechanism 5, vertical connecting piece 6, opening and closing connecting piece 7, rectangular bottom frame 10, universal wheel 11, vertical rod 12, rectangular top frame 13, middle rod 14, handle 15, guide rail 16, end fixing plate 17, guide rod 200, concave fastener 201, limiting ring 202, end cap 203, first spring 204, cross plate 205, end arm 206, clamping plate 207, U-shaped card slot 208, lifting seat 209, inclined hole 210, pressing rod 211, middle block 212, connecting rod 213, nut 214, second spring 215, end cover 216, end seat 217, L-shaped arm 218, holding rod 219, guide sleeve 220, concave pulling piece 221, outer pull rod 222, swing arm 223, connecting end rod 224, limiting convex plate 225, baffle 226, side plate 227, notch 228, rectangular pipe 30, outer extension shaft 31, pulley 32, ring groove 33, end concave piece 34, holding hole 35, groove-shaped piece 500, fixing seat 501, guide pin 502, third spring 503, movable plate 504, concave movable plate 505, rotating seat 506, inner pressing wheel 507, pushing and pulling arm 508, connecting shaft 509, outer top wheel 510, inner shaft 511, spreading plate 512, holding block 513, locking ring 514, bayonet 515, embedded groove 516, spline shaft 520, end nut 521, fourth spring 522, end plate 523, wedge-shaped convex part 524, spline sleeve 525, positioning rod 526, clamping plate 527, compression spring 528, outer extension convex plate 529, inclined surface 530, middle through shaft 540, lower end block 60, vertical plate 61, upper end block 62, middle concave piece 63, sliding sleeve 64, rotating convex part 65, inner pressing shaft 66, eccentric pressing wheel 67, holding end rod 68, rotating convex plate 700, hinge shaft 701, rotating concave seat 702, concave clamping seat 703, connecting convex plate 704, clamping shaft 705, inner vertical plate 706, pull rod 707, end pulling plate 708, concave rod 709, inner pulling plate 710, guiding through rod 711, fifth spring 712, concave clamping piece 713. Detailed implementation manner

[0040] As Figure 1 shown, a circuit board placement rack includes a turnover section 1. A moving section 3 is provided at the upper end of the turnover section 1. A plurality of placing sections 4 are arranged on the moving section 3 along its length direction. A chain section 2 is provided on the turnover section 1. The chain section 2 is connected to the moving section 3 and is used for locking the movement of the moving section 3.

[0041] Among them, the placing section 4 includes a pair of vertical connecting pieces 6. A pair of clamping mechanisms 5 are provided on the vertical connecting pieces 6. The clamping mechanisms 5 are distributed up and down. The clamping mechanism 5 located at the upper end is movably arranged on the vertical connecting piece 6. The clamping mechanism 5 located at the lower end is fixed to the lower end of the vertical connecting piece 6. An opening and closing connecting piece 7 is provided on the clamping mechanism 5 located at the lower end. The opening and closing connecting piece 7 is arranged on the moving section 3.

[0042] As shown Figure 2 As shown, the turnover unit 1 includes a rectangular bottom frame 10. A pair of end fixing plates 17 are respectively installed at both ends of the rectangular bottom frame 10 by screws. A universal wheel 11 is installed on the end fixing plate 17 by bolts. A pair of vertical rods 12 are respectively installed at both ends of the rectangular bottom frame 10 by screws. The upper end of the vertical rod 12 is installed with a rectangular top frame 13. A plurality of handles 15 are installed on the outer side of the rectangular top frame 13. A middle rod 14 is installed inside the rectangular top frame 13 by bolts. A pair of guide rails 16 are installed at the upper end of the rectangular top frame 13. The length direction of the guide rail 16 is parallel to the length direction of the rectangular top frame 13.

[0043] As shown Figure 3 As shown, the moving unit 3 includes a pair of rectangular tubes 30. The length direction of the rectangular tube 30 is parallel to the length direction of the rectangular top frame 13. End concave parts 34 are installed at both ends of the rectangular tube 30 by bolts. A plurality of holding holes 35 are formed in the end concave parts 34. A plurality of outer extension shafts 31 are fixed on the outer wall of the rectangular tube 30. A pulley 32 is rotatably provided on the outer extension shaft 31. An annular groove 33 is formed on the outer circumference of the pulley 32. The pulley 32 is slidably arranged on the guide rail 16, and the bottom of the annular groove 33 is tangent to the upper end of the guide rail 16.

[0044] As shown Figure 4 and Figure 5 As shown, the interlocking unit 2 includes a pair of guide rods 200 penetrating through the middle rod 14. The upper end of the guide rod 200 is threadedly connected with a concave fastener 201. The concave fastener 201 is buckled on the middle rod 14. A limiting ring 202 is formed on the guide rod 200. The limiting ring 202 is located below the middle rod 14. The lower end of the guide rod 200 is provided with an end cap 203. A cross plate 205 is movably arranged on the guide rod 200. A first spring 204 is sleeved on the guide rod 200. The first spring 204 is located between the end cap 203 and the cross plate 205. End arms 206 are formed at both ends of the cross plate 205. The length direction of the end arm 206 is perpendicular to the length direction of the cross plate 205. A plurality of clamping plates 207 are installed on the cross plate 205. A U-shaped clamping groove 208 is formed at the upper end of the clamping plate 207. When the interlocking unit 2 limits the position of the moving unit 3, the outer extension shaft 31 is clamped in the U-shaped clamping groove 208.

[0045] When the interlocking unit 2 provided in this embodiment locks the position of the moving unit 3, the downward pulling force on the cross plate 205 is cancelled, so that the cross plate 205 moves upward under the action of the first spring 204, so as to clamp the outer extension shaft 31 in the U-shaped clamping groove 208 of the clamping plate 207. In this way, during the transfer, the movement between the moving unit 3 and the turnover unit 1 can be avoided.

[0046] When the interlocking unit 2 provided in this embodiment cancels the locking of the position of the moving unit 3, the connection between the clamping plate 207 and the outer extension shaft 31 can be cancelled by pulling the cross plate 205 downward. And at this time, the first spring 204 is compressed to provide power for the recovery movement for the reconnection operation.

[0047] In order to more conveniently perform the locking and unlocking operations of the chain part 2 on the moving part 3, the following embodiments are provided. A pair of lifting seats 209 are installed on the lower wall of the cross plate 205 by screws. Oblique holes 210 are formed in the lifting seats 209. There is an included angle between the length direction of the oblique holes 210 and the vertical direction. A middle block 212 is movably arranged between the lifting seats 209. Pressing rods 211 are rotatably arranged at both ends of the middle block 212. The pressing rods 211 are inserted into the oblique holes 210. A pair of connecting rods 213 are connected to the middle block 212 by threads. Nuts 214 are connected to the connecting rods 213 by threads. End seats 217 are sleeved on the connecting rods 213. The upper end of the end seat 217 is installed at one end of the rectangular top frame 13 by screws. A pair of guide sleeves 220 are welded on the inner side of the end seat 217. The connecting rods 213 are inserted into the guide sleeves 220. End caps 216 are connected to the guide sleeves 220 by threads. The connecting rods 213 are inserted through the end caps 216. A second spring 215 is sleeved on the connecting rods 213. The second spring 215 is located between the nut 214 and the end cap 216. The outer end of the connecting rod 213 is connected to a concave pulling piece 221 by threads. The concave pulling piece 221 is located outside the end seat 217. An outer pulling rod 222 is rotatably arranged on the concave pulling piece 221. Swing arms 223 are fixed to both ends of the outer pulling rod 222 by splines. A connecting end rod 224 is arranged on the outer side of the other end of the swing arm 223. A pair of side plates 227 are formed on both sides of the end seat 217. A notch 228 is formed in the upper end of the side plate 227 in an open manner. When the outer extension shaft 31 is disconnected from the U-shaped card slot 208, the connecting end rod 224 is inserted into the notch 228. A limiting convex plate 225 is welded on the outer circumference of the outer pulling rod 222. A baffle 226 is welded on the concave pulling piece 221. When the connecting end rod 224 is inserted into the notch 228, the baffle 226 is used for rotational limiting of the limiting convex plate 225.

[0048] A pair of L-shaped arms 218 are installed on the end seat 217 by screws. A holding rod 219 is fixed to the end of the L-shaped arm 218 by a pair of nuts.

[0049] As an additional embodiment, when the locking and unlocking operations of the linkage part 2 on the moving part 3 are performed by means of the above-mentioned embodiment, the following method is adopted. The operator can hold the holding rod 219 and the outer pull rod 222, and then the operator pulls the outer pull rod 222 outward by means of the holding rod 219. When the outer pull rod 222 moves outward, it will cause the connecting rod 213 to move outward as a whole. When it moves outward, the second spring 215 will be compressed, and as the connecting rod 213 moves, it will pull the middle block 212 and the pressure rods 211 at both ends thereof to move, and through the movement of the pressure rods 211, it will act on the inclined holes 210, so that the lifting seat 209 and the cross plate 205 and the clamping plate 207 thereon move downward. During the movement, the first spring 204 is compressed. And as the clamping plate 207 moves downward, the limit on the outer extension shaft 31 will be cancelled. Subsequently, the operator rotates the swing arm 223, so that the connecting end rod 224 is clamped in the notch 228, and at the same time the swing arm 223 is in a horizontal state. Then the operator pulls the moving part 3 onto the turnover part 1 or removes it from the turnover part 1.

[0050] As Figures 7 to 11 shown, the clamping mechanism 5 includes a channel-shaped member 500. A middle through shaft 540 is welded at the middle position of the channel-shaped member 500. A spreading plate 512 is rotatably provided on the middle through shaft 540. The spreading plate 512 has a long strip-shaped structure, and both sides of the spreading plate 512 along its width direction are flat surfaces, and both ends of the spreading plate 512 along its length direction are arc surfaces. The arc surfaces at both ends of the spreading plate 512 are in a rotationally symmetric relationship, and the center of the arc surface deviates from the geometric center position of the spreading plate 512, so that both ends of the spreading plate 512 are in a wedge-shaped structure. A holding block 513 is formed at the outer end of the spreading plate 512. A pair of outer top wheels 510 are tangent to the outer periphery of the spreading plate 512. The outer top wheels 510 are located on both sides of the spreading plate 512. A connecting shaft 509 is provided on the outer top wheel 510.

[0051] A fixed seat 501 is installed on the channel-shaped member 500. A pair of guide pins 502 are connected to the fixed seat 501 by threads. A limit cap is provided at the inner end of the guide pin 502. A movable plate 504 is sleeved on the guide pin 502. A third spring 503 is sleeved on the guide pin 502. The third spring 503 is located between the movable plate 504 and the fixed seat 501. A concave movable plate 505 is welded on the movable plate 504. Rotating seats 506 are installed at both ends of the concave movable plate 505 by screws. An inner pressure wheel 507 is rotatably provided at the inner end of the rotating seat 506. A push-pull arm 508 is welded on the inner side of the concave movable plate 505. The connecting shaft 509 is rotatably provided at the inner end of the push-pull arm 508.

[0052] A pair of clamping plates 527 are provided inside the channel-shaped member 500. An outer protruding plate 529 is provided on the outer wall of the clamping plate 527. The outer protruding plate 529 penetrates through both sides of the channel-shaped member 500. An inclined surface 530 is formed at the outer end of the outer protruding plate 529. The inner end of the inclined surface 530 extends inwardly. The outer circumference of the inner pressing wheel 507 is tangent to the outer end of the outer protruding plate 529. A compression spring 528 is fixed between the two ends of the clamping plate 527.

[0053] When the clamping mechanism 5 limits the two sides of the circuit board, the operator rotates the spreading plate 512 through the holding block 513. When the spreading plate 512 rotates, the outer top wheel 510 will gradually move from being tangent to the plane of the spreading plate 512 to the arc surface. When the outer top wheel 510 contacts the arc surface, it will gradually move outward. The outward movement of the outer top wheel 510 will cause the concave moving plate 505 to move outward, and at the same time, the third spring 503 is compressed. As the concave moving plate 505 moves outward, the inner pressing wheel 507 acts on the inclined surface 530 of the outer protruding plate 529, so that the outer protruding plate 529 and the clamping plate 527 at its inner end move towards both sides of the circuit board, and the purpose of limiting the circuit board by the clamping plate 527 is achieved, and at this time, the compression spring 528 is also in a compressed state.

[0054] In the first optional embodiment, a ratchet wheel is fixed on the spreading plate 512, and the ratchet wheel and the inner penetrating shaft 540 are coaxially arranged, and the ratchet wheel is arranged at the inner end of the spreading plate 512. A ratchet pawl is connected to the ratchet wheel. The inner end of the ratchet pawl is clamped in the ratchet groove of the ratchet wheel. The outer end of the ratchet pawl is rotatably provided with a ratchet pawl rotating pin, and the ratchet pawl rotating pin is fixed on the channel-shaped member 500. In order to ensure that the ratchet pawl is always connected to the ratchet wheel, a torsion spring is also sleeved on the ratchet pawl rotating pin. By setting the ratchet wheel and the ratchet pawl, the rotation angle of the spreading plate 512 can be locked at any time to ensure the clamping effect of the clamping plate 527 on the circuit board.

[0055] In the second optional embodiment, a holding block 513 tightening nut can be threadedly connected to the outer end of the middle penetrating shaft 540, and the rotation orientation of the spreading plate 512 can be locked by this nut.

[0056] In the third optional embodiment, the middle penetrating shaft 540 includes an inner shaft 511 welded to the middle position of the channel-shaped member 500. A spline shaft 520 is formed at the outer end of the inner shaft 511. A screw rod is provided at the outer end of the spline shaft 520, and an end nut 521 is threadedly connected to the screw rod.

[0057] A spline shaft 520 is sleeved with a spline sleeve 525. An end plate 523 is provided at the outer end of the spline sleeve 525. A plurality of wedge-shaped convex parts 524 are arranged in a circumferential array on the inner wall of the end plate 523. An inclined surface is formed on one side of the inner end of the wedge-shaped convex part 524. A fourth spring 522 is sleeved on the spline shaft 520. The fourth spring 522 is located between the end nut 521 and the end plate 523. A positioning rod 526 is provided on the outer circumference of the spline sleeve 525 perpendicular to its axis.

[0058] A locking ring 514 is provided on the holding block 513. At least a pair of rotationally symmetric inner embedding grooves 516 are formed on the locking ring 514. One side of the inner embedding groove 516 is a vertical plane, and the other side is an outer top inclined surface. A plurality of clamping openings 515 are formed at the open outer end of the inner embedding groove 516. The outer top inclined surface acts on the inclined surface so that the positioning rod 526 moves out of the clamping opening 515. When the wedge-shaped convex part 524 penetrates into the inner embedding groove 516, the positioning rod 526 is clamped in the clamping opening 515.

[0059] When locking the rotation state of the spreading plate 512 in this embodiment, when the spreading plate 512 rotates, it will cause the outer top inclined surface of the inner embedding groove 516 to act on the inclined surface of the wedge-shaped convex part 524, so that the wedge-shaped convex part 524, the spline sleeve 525 and the positioning rod 526 move outwards under the action of the outer top inclined surface, and the fourth spring 522 is compressed. The positioning rod 526 moves out of one of the pairs of clamping openings 515. Therefore, the rotation lock of the spreading plate 512 will be cancelled. After the spreading plate 512 finishes rotating, that is, after the clamping plate 527 clamps the circuit board, the wedge-shaped convex part 524 is inserted into the inner embedding groove 516 again, and the positioning rod 526 is also inserted into the clamping opening 515. At this time, it can be ensured that the spreading plate 512 will not rotate spontaneously, thus ensuring the stability of the clamping of the clamping plate 527.

[0060] As Figure 12 and Figure 14 shown, the vertical connecting member 6 includes a pair of lower end blocks 60. The lower end blocks 60 are installed on the channel-shaped member 500 on the lower clamping mechanism 5 by screws. A vertical plate 61 is welded on the lower end block 60. An upper end block 62 is welded on the upper end of the vertical plate 61. A middle concave member 63 is installed between the upper end blocks 62 by screws. A sliding sleeve 64 is sleeved on the vertical plate 61. The sliding sleeve 64 is installed on the channel-shaped member 500 on the upper clamping mechanism 5 by screws. A rotating convex part 65 is formed on the inner side of the sliding sleeve 64. An inner pressing shaft 66 is rotatably provided on the rotating convex part 65. Eccentric pressing wheels 67 are respectively provided at both ends of the inner pressing shaft 66 eccentrically. The outer circumference of the eccentric pressing wheel 67 abuts against the outer wall of the vertical plate 61. A holding end rod 68 is welded on the inner pressing shaft 66 perpendicular to its axis.

[0061] When adjusting the position of the clamping mechanism 5 at the upper end, the operator rotates the eccentric pressing wheel 67 outward by holding the end rod 68, so that the eccentric pressing wheel 67 is disengaged from the outer wall of the vertical plate 61. After that, the position of the clamping mechanism 5 at the upper end is adjusted. After the adjustment, the operator rotates the eccentric pressing wheel 67 inward by holding the end rod 68, so that the outer periphery of the eccentric pressing wheel 67 abuts against the outer wall of the vertical plate 61, and finally locks the position of the clamping mechanism 5 at the upper end.

[0062] As Figure 6 , Figure 12 and Figure 13 shown, the opening and closing connecting member 7 includes a rotating convex plate 700 welded to one of the rectangular tubes 30. The upper end of the rotating convex plate 700 is provided with a hinge shaft 701. A rotating concave seat 702 is rotatably provided on the hinge shaft 701. The rotating concave seat 702 is installed at one end of a channel-shaped member 500 on the clamping mechanism 5 at the lower end by screws.

[0063] A connecting convex plate 704 is welded to the other rectangular tube 30. The upper end of the connecting convex plate 704 is provided with a clamping shaft 705. A concave clamping seat 703 is sleeved on the upper end of the connecting convex plate 704. An inner concave arc groove is formed at the lower end of the concave clamping seat 703. The clamping shaft 705 passes through the inner concave arc groove. The concave clamping seat 703 is installed at the other end of the channel-shaped member 500 on the clamping mechanism 5 at the lower end by screws.

[0064] A concave clamping member 713 is sleeved on the lower end of the connecting convex plate 704. An L-shaped groove is formed on the upper wall of the concave clamping member 713. The clamping shaft 705 is located in the L-shaped groove. An inner pull plate 710 is installed at the inner side end of the concave clamping member 713 by screws. A pair of guiding through rods 711 are threadedly connected to the upper end of the inner pull plate 710. Inner end caps are provided at the inner side ends of the guiding through rods 711. An inner vertical plate 706 is sleeved on the guiding through rods 711. The inner end caps are located inside the inner vertical plate 706. The inner vertical plate 706 is installed on the channel-shaped member 500 on the clamping mechanism 5 at the lower end by screws. A fifth spring 712 is sleeved on the guiding through rods 711. The fifth spring 712 is located between the inner vertical plate 706 and the inner pull plate 710. A pull rod 707 is threadedly connected to the inner pull plate 710. The other end of the pull rod 707 is welded with an end pull plate 708. A concave rod 709 is welded to the end pull plate 708.

[0065] When placing or removing the circuit board, the operator pulls the concave rod 709 on the corresponding placing part 4 outward. When the concave rod 709 is pulled outward, it will cause the pull rod 707 to pull the concave clamping member 713 to move inward, and cancel the limit on the lower side of the clamping shaft 705. After that, the placing part 4 is rotated around the axis of the hinge shaft 701, so that the placing part 4 can be exposed from other placing parts 4, thus facilitating the placement or removal of the circuit board.

[0066] Generally speaking, the operations of placing, transferring, and removing the circuit board are carried out in the following manner.

[0067] Step 1, the operator cancels the connection between one of the empty placement parts 4 and the moving part 3, and rotates the placement part 4 outward so that the placement part 4 rotates from above the moving part 3 to one side of it.

[0068] Step 2, the operator places one or more circuit boards to be degummed on the movable clamping mechanism 5.

[0069] Step 3, the operator rotates the spreading plate 512 through the holding block 513, and clamps the circuit board with the clamping plate 527 on the clamping mechanism 5.

[0070] Step 4, the operator moves the clamping mechanism 5 in step 2 upward, and makes the other end of the circuit board located and inserted into another clamping mechanism 5, and locks the clamping mechanism 5 in step 2 by rotating the eccentric pressure wheel 67. After that, the other end of the circuit board is clamped in the manner described in step 3.

[0071] Step 5, the operator rotates the placement part 4 so that it is located above the moving part 3, and positions the card shaft 705 through the concave card part 713 on it.

[0072] Step 6, the circuit boards to be degummed are placed on the placement part 4 in sequence according to the above steps 1 to 5.

[0073] Step 7, the operator transfers the moving part 3 carrying multiple circuit boards to the turnover part 1. When transferring, first make the card plate 207 move downward, and then transfer the moving part 3 to the turnover part 1. When the transfer is in place, limit and lock the extension shaft 31 through the card plate 207.

[0074] Step 8, the operator transfers the circuit board to the plasma degumming device through the turnover part 1, then cancels the connection between the turnover part 1 and the moving part 3, and pushes the moving part 3 and the circuit boards on it into the plasma degumming device for degumming operation.

[0075] Step 9, transfer the cleaned circuit boards to the turnover part 1 again, and take out the circuit boards in sequence, and the operation is completed.

[0076] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A circuit board placement rack, characterized in that: The utility model comprises a rotating part (1), a moving part (3) is provided at the upper end of the rotating part (1), a plurality of placement parts (4) are provided on the moving part (3) along its length direction, a locking part (2) is provided on the rotating part (1), and the locking part (2) is connected to the moving part (3) and is used for locking the moving part (3); The placement portion (4) comprises a pair of vertical connecting members (6), a pair of clamping mechanisms (5) are provided on the vertical connecting members (6), the clamping mechanisms (5) are distributed in an upper and lower manner, the clamping mechanism (5) at the upper end is movably provided on the vertical connecting member (6), the clamping mechanism (5) at the lower end is fixed to the lower end of the vertical connecting member (6), and the clamping mechanism (5) at the lower end is provided with an opening and closing connecting member (7), and the opening and closing connecting member (7) is provided on the moving portion (3).

2. The circuit board placement rack according to claim 1, characterized in that: The turnover part (1) comprises a rectangular bottom frame (10), a pair of end fixing plates (17) are respectively fixed at two ends of the rectangular bottom frame (10) by screws, a universal wheel (11) is fixed on the end fixing plate (17) by bolts, a pair of vertical rods (12) are respectively fixed at two ends of the rectangular bottom frame (10) by screws, a rectangular top frame (13) is fixed at the upper ends of the vertical rods (12), a plurality of handles (15) are fixed on the outer side of the rectangular top frame (13), a middle rod (14) is fixed inside the rectangular top frame (13) by bolts, and a pair of guide rails (16) are fixed at the upper end of the rectangular top frame (13), and the length direction of the guide rails (16) is parallel to the length direction of the rectangular top frame (13).

3. The circuit board placement rack according to claim 2, characterized in that: The moving part (3) comprises a pair of rectangular tubes (30), the length direction of the rectangular tubes (30) is parallel to the length direction of the rectangular top frame (13), end recesses (34) are installed at both ends of the rectangular tubes (30) by bolts, and a plurality of gripping holes (35) are provided on the end recesses (34), a plurality of extending shafts (31) are fixed to the outer wall of the rectangular tubes (30), a pulley (32) is rotatably provided on the extending shafts (31), an annular groove (33) is provided on the outer periphery of the pulley (32), the pulley (32) is slidably provided on the guide rail (16), and the bottom of the annular groove (33) is tangent to the upper end of the guide rail (16).

4. The circuit board placement rack according to claim 3, characterized in that: The interlocking portion (2) comprises a pair of guide rods (200) which are inserted into the middle rod (14); the upper ends of the guide rods (200) are connected with concave fasteners (201) by threads; the concave fasteners (201) are fastened to the middle rod (14); a limiting ring (202) is formed on the guide rod (200); the limiting ring (202) is located on the lower side of the middle rod (14); an end cap (203) is provided at the lower end of the guide rod (200); a horizontal plate (205) is movably provided on the guide rod (200); and a first elastic sleeve is provided on the guide rod (200). A spring (204) is provided, wherein the first spring (204) is located between the end cap (203) and the transverse plate (205); end arms (206) are formed at both ends of the transverse plate (205); the length direction of the end arms (206) is perpendicular to the length direction of the transverse plate (205); a plurality of clamping plates (207) are mounted on the end arms (206); a U-shaped clamping groove (208) is provided at the upper end of the clamping plate (207); when the interlocking portion (2) limits the position of the moving portion (3), the extended shaft (31) is clamped in the U-shaped clamping groove (208).

5. The circuit board placement rack according to claim 4, characterized in that: A pair of lifting seats (209) are installed on the lower wall of the horizontal plate (205) by screws, and an inclined hole (210) is opened on the lifting seats. An angle is formed between the length direction and the vertical direction of the inclined hole (210). A middle block (212) is movably provided between the lifting seats (209). Pressure rods (211) penetrating the inclined hole (210) are rotatably provided at both ends of the middle block (212). A pair of connecting rods (213) are connected to the middle block (212) by threads, and nuts (213) are connected to the connecting rods (213) by threads. 214, an end seat (217) is sleeved on the connecting rod (213), the upper end of the end seat (217) is mounted on one end of the rectangular top frame (13) by means of screws, a pair of guide sleeves (220) are welded on the inner side of the end seat (217), the connecting rod (213) is inserted into the guide sleeve (220), an end cover (216) is connected to the guide sleeve (220) by means of threads, the connecting rod (213) is inserted into the end cover (216), and a second spring (215) is sleeved on the connecting rod (213), The second spring (215) is located between the nut (214) and the end cover (216). The outer end of the connecting rod (213) is connected to a concave pull piece (221) through a thread. The concave pull piece (221) is located on the outer side of the end seat (217) and an outer pull rod (222) is rotatably provided on the concave pull piece (221). The two ends of the outer pull rod (222) are fixed with swing arms (223) through splines. The other end of the swing arm (223) is provided with a connecting end rod (224) on the outer side. A pair of side The side plate (227) has an opening at the upper end thereof and a notch (228). When the extended shaft (31) is disconnected from the U-shaped slot (208), the connecting end rod (224) is inserted into the notch (228). A limiting convex plate (225) is welded to the outer periphery of the outer pull rod (222). A baffle (226) is welded to the concave pull piece (221). When the connecting end rod (224) is inserted into the notch (228), the baffle (226) is used to limit the rotation of the limiting convex plate (225). A pair of L-shaped arms (218) are mounted on the end seat (217) by means of screws, and a holding rod (219) is fixed to the end of the L-shaped arms by means of a pair of nuts.

6. The circuit board placement rack according to claim 2, characterized in that: The clamping mechanism (5) comprises a groove-shaped member (500), a central through-shaft (540) is welded at the middle position thereof, a long strip-shaped support plate (512) is rotatably provided on the central through-shaft (540), the two sides of which in the width direction are planes, and the two ends in the length direction are arc surfaces, the arc surfaces at the two ends of the support plate (512) are rotationally symmetrical, the centers of the arc surfaces deviate from the geometric center positions of the support plate (512), so that the two ends of the support plate (512) are wedge-shaped structures, a gripping block (513) is formed at the outer end of the support plate (512), the outer periphery of the support plate (512) is tangent to a pair of outer top wheels (510), the outer top wheels (510) are located on the two sides of the support plate (512), and a connecting shaft (509) is provided on the outer top wheels (510); A fixed seat (501) is installed on the groove-shaped member (500), and a pair of guide pins (502) are connected thereto by threads, and a limit cap is provided at the inner end of the guide pin (502), and a movable plate (504) is sleeved on the guide pin (502), and a third spring (503) is sleeved on the guide pin (502), and the third spring (503) is located between the movable plate (504) and the fixed seat (501), and a concave movable plate (505) is welded on the movable plate (504), and rotating seats (506) are installed at both ends of the concave movable plate (505) by screws, and an inner pressure wheel (507) is rotatably provided at the inner end of the rotating seat (506), and a push-pull arm (508) is welded on the inner side of the concave movable plate (505), and a connecting shaft (509) is rotatably provided on the inner end of the push-pull arm (508); A pair of clamping plates (527) are provided in the groove-shaped member (500), and a pair of outwardly extending convex plates (529) are provided on the outer walls of the clamping plates (527). The outwardly extending convex plates (529) are passed through the two sides of the groove-shaped member (500), and the outer ends of the outwardly extending convex plates (529) are formed with inclined surfaces (530), and the inner ends of the inclined surfaces (530) extend inwardly in an inclined manner. The outer periphery of the inner pressure wheel (507) is tangent to the outer ends of the outwardly extending convex plates (529), and a compression spring (528) is fixed between the two ends of the clamping plates (527).

7. The circuit board placement rack according to claim 6, characterized in that: The middle through shaft (540) comprises an inner shaft (511) welded to the middle position of the groove-shaped member (500); a spline shaft (520) is formed on the outer end of the inner shaft (511); a screw is provided on the outer end of the spline shaft (520); an end nut (521) is connected to the screw by a thread; a spline sleeve (525) is sleeved on the spline shaft (520); an end plate (523) is provided on the outer end of the spline sleeve (525); a plurality of wedge-shaped protrusions (524) are provided on the inner wall of the end plate (523) in a circumferential array; an inclined surface is formed on one side of the inner end of the wedge-shaped protrusion (524); a fourth spring (522) is sleeved on the spline shaft (520); the fourth spring (522) is located between the end nut (521) and the end plate (523); and a positioning rod (526) is provided on the outer periphery of the spline sleeve (525) perpendicular to the axial direction thereof; A locking ring (514) is provided on the holding block (513), and at least one pair of rotationally symmetrical embedded grooves (516) are provided on the locking ring (514), one side of the embedded groove (516) is a vertical plane, and the other side of the embedded groove (516) is an outer top inclined surface, and a plurality of bayonet holes (515) are formed in an opening at the outer end of the embedded groove (516), and the outer top inclined surface acts on the inclined surface to move the positioning rod (526) out of the bayonet hole (515), and when the wedge-shaped protrusion (524) passes through the embedded groove (516), the positioning rod (526) is clamped in the bayonet hole (515).

8. The circuit board placement rack according to claim 6, characterized in that: The vertical connecting member (6) comprises a pair of lower end blocks (60), the lower end blocks (60) being mounted on a groove-shaped member (500) on a clamping mechanism (5) at the lower end by means of screws, a vertical plate (61) being welded to the lower end block (60), an upper end block (62) being welded to the upper end of the vertical plate (61), a concave member (63) being mounted between the upper end blocks (62) by means of screws, a sliding sleeve (64) being sleeved on the vertical plate (61), and the sliding sleeve (64) being screwed A grooved member (500) is mounted on the clamping mechanism (5) at the upper end, and a rotating protrusion (65) is formed on the inner side of the sliding sleeve (64). An inner pressure shaft (66) is rotatably provided on the rotating protrusion (65). Eccentric pressure wheels (67) are eccentrically provided at both ends of the inner pressure shaft (66). The outer periphery of the eccentric pressure wheel (67) is pressed tightly against the outer wall of the vertical plate (61). A holding end rod (68) is welded to the inner pressure shaft (66) perpendicular to its axial direction.

9. The circuit board placement rack according to claim 6, characterized in that: The opening and closing connecting member (7) comprises a rotating convex plate (700) welded to one of the rectangular tubes (30), a hinge shaft (701) being provided at the upper end of the rotating convex plate (700), a rotating recess (702) being rotatably provided on the hinge shaft (701), and the rotating recess (702) being mounted on one end of a groove-shaped member (500) on the clamping mechanism (5) at the lower end by means of screws; A connecting convex plate (704) is welded to another rectangular tube (30), a clamping shaft (705) is provided at the upper end of the connecting convex plate (704), a concave clamping seat (703) is sleeved on the upper end of the connecting convex plate (704), an inner concave arc groove is formed at the lower end of the concave clamping seat (703), the clamping shaft (705) is inserted into the inner concave arc groove, and the concave clamping seat (703) is mounted on the other end of the groove-shaped member (500) on the clamping mechanism (5) at the lower end by means of screws; The lower end of the connecting convex plate (704) is sleeved with a concave clamping piece (713), the upper wall of the concave clamping piece (713) is provided with an L-shaped groove, the clamping shaft (705) is located in the L-shaped groove, the inner end of the concave clamping piece (713) is installed with an inner pull plate (710) by means of screws, the upper end of the inner pull plate (710) is connected with a pair of guide rods (711) by means of threads, the inner end of the guide rods (711) is provided with an inner end cap, the guide rods (711) are sleeved with an inner vertical plate (706), the inner end cap is located on the inner vertical plate (706), and the inner vertical plate (706) is provided with a plurality of guide rods (711) and a plurality of guide rods (711) are provided with inner end caps. 06), the inner vertical plate (706) is installed on the grooved member (500) on the clamping mechanism (5) at the lower end by screws, a fifth spring (712) is sleeved on the guide through rod (711), the fifth spring (712) is located between the inner vertical plate (706) and the inner pull plate (710), a pull rod (707) is connected to the inner pull plate (710) by threads, the other end of the pull rod (707) is welded with an end pull plate (708), and a concave rod (709) is welded to the end pull plate (708).

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