Movable rotating platform for carrying lead frame

Abstract

The invention discloses a movable rotating mechanism for lead frame carrying. The movable rotating mechanism comprises a conveying bottom plate; a frame carrying unit; a frame alignment unit; a frame guide unit; a frame traction unit; and a frame clamping unit. The structure is reasonable, in the automatic sealing, testing and feeding process, after a lead frame is pushed into the frame guiding unit through an external push rod, the frame traction unit drives the frame clamping unit to clamp the front end of a strip, and then the lead frame is driven to move into the frame arraying unit; by means of the lead frame feeding device, the current lead frame feeding process is changed, the problem of lead frame shaking caused by grabbing of a mechanical arm or pushing of a push rod in the feeding process of traditional automatic sealing and testing equipment is solved, and the lead frame feeding efficiency is improved. Product scrapping caused by welding wire deformation on the lead frame due to shaking is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic packaging production, and particularly relates to a mobile rotary platform for lead frame carrying. BACKGROUND

[0002] The lead frame is an important basic raw material in the semiconductor manufacturing process, and is a thin plate metal frame for connecting the contact points of the internal chips of a semiconductor integrated block and external wires. The lead frame mainly consists of two parts: a chip pad and a pin. As a chip carrier of an integrated circuit, the lead frame is a key structural part for electrically connecting the internal circuit lead-out end (bonding point) of the chip to the internal lead and the external lead through a bonding material (gold wire or copper wire) to form an electrical circuit, and plays a role of a bridge for connecting with external wires.

[0003] The plastic packaging is a production and manufacturing process of semiconductor components by heating resin and packaging the resin on the surface of the lead frame. In the packaging production process of the existing automatic packaging equipment, the lead frame needs to pass through the processes of piece arranging, transportation, carrying, preheating, feeding, packaging, discharging, punching and collecting in sequence. With the continuous development of the semiconductor industry, the packaging forms are becoming more and more various. According to the shape, size and structure of the packaging, the packaging forms can be divided into three categories: pin insertion type, surface mount type and advanced packaging. From DIP, SOP, QFP, PGA, BGA to CSP and SIP, the technical indicators are more and more advanced. Generally speaking, the semiconductor packaging has experienced three major innovations: the first innovation is from pin insertion packaging to surface mount packaging in the 1980s, which greatly improves the assembly density on the printed circuit board; the second innovation is the appearance of the ball matrix packaging in the 1990s, which meets the market demand for high pins and improves the performance of semiconductor devices; chip-level packaging and system packaging are the products of the third innovation, and the purpose is to minimize the packaging area. The traditional domestic automatic packaging equipment is relatively weak in carrying the lead frame with high pins and multiple solder wires.

[0004] The traditional lead frame carrying mechanism pushes the lead frame in the box out to one side of the transition platform through the push rod mechanism outside, and transports the lead frame to the rotary table through the friction force of the roller and the belt. Another belt repeats the action to realize the transportation of the belt. However, in the process of transporting the belt, the uncontrollability of the friction resistance of the belt pulley and the friction resistance between the belt and the transition platform and the rotary table makes the belt prone to shaking in the moving process, and the belt and the rotary table are prone to collision, which causes the solder wire on the lead frame to deform and cause the wire to collapse. This wire collapse will cause the chip circuit to short circuit, thereby affecting the normal work of the chip. Secondly, even if there is no short circuit, the wire collapse may also cause the performance of the circuit to decrease, such as increased resistance, blocked signal transmission, etc. These problems will seriously affect the stability and reliability of the chip. SUMMARY

[0005] The present application aims to solve at least one of the problems in the related art.

[0006] To this end, the present application aims to provide a mobile rotary platform for lead frame carrying, which changes the current lead frame feeding process, solves the problem of lead frame shaking caused by mechanical hand grabbing or push rod pushing in the feeding process of traditional automatic testing equipment, and avoids the deformation of the welding wire on the lead frame caused by shaking, thereby avoiding product scrapping.

[0007] To achieve the above-mentioned purpose, the present application provides a mobile rotary platform for lead frame carrying, comprising:

[0008] a transmission bottom plate;

[0009] a frame carrying unit arranged on the top of the transmission bottom plate and used for driving a frame alignment unit to perform rotation positioning around the Z axis and translation feeding along the Y axis;

[0010] a frame alignment unit arranged on the frame carrying unit and used for carrying a lead frame, which comprises a rotary positioning platform, and a rectangular support sliding table symmetrically arranged on the top of the rotary positioning platform;

[0011] a frame guiding unit arranged on the top of the transmission bottom plate and located on one side of the rectangular support sliding table, which comprises a fixed guide rail and a floating guide rail, wherein the floating guide rail can be adjusted in the Z axis direction to realize alignment compensation;

[0012] a frame traction unit arranged on the top of the transmission bottom plate and located on one side of the frame carrying unit, which is used for driving a frame clamping unit to perform lifting alignment along the Z axis and translation conveying along the Y axis;

[0013] a frame clamping unit arranged on the frame traction unit, which comprises an electric cylinder assembly and a clamping jaw, and the opening and closing action of the clamping jaw is realized by the driving of the electric cylinder assembly to complete the grabbing and releasing of the lead frame.

[0014] In addition, the mobile rotary platform for lead frame carrying according to the above application can also have the following additional technical features:

[0015] Specifically, the frame carrying unit comprises a transmission screw, a first servo motor and a linear bearing seat, the transmission screw is rotationally connected at the center of the top of the transmission bottom plate, and horizontal guide rails are symmetrically arranged on the outer side of the transmission screw, and two groups of the horizontal guide rails are both horizontally slidably connected with sliding blocks on the top thereof.

[0016] The first servo motor is fixedly connected at the top of the transmission bottom plate and located outside the horizontal guide rail, a first synchronous pulley and a second synchronous pulley are arranged at positions corresponding to the output end surface of the first servo motor on the surface of one end of the transmission screw rod, and are connected by a first synchronous belt, the linear bearing seat is fixedly connected at the top of the sliding block and is threadedly connected to the outer surface of the transmission screw rod, and four groups of stand columns are arranged at the top of the linear bearing seat and are connected to the bottom of the rotary positioning platform.

[0017] Specifically, the rotary positioning platform comprises a base plate, a hole groove is formed in the center of the base plate, and a hollow transmission shaft is rotatably connected to the inner wall of the hole groove, a support bottom plate is fixedly connected to the top of the hollow transmission shaft, and a rectangular support sliding table is symmetrically arranged on the top of the support bottom plate, and a third synchronous pulley is fixedly connected to the bottom of the hollow transmission shaft.

[0018] A servo power assembly is fixedly connected to the bottom of one end of the base plate through a motor mounting plate, the servo power assembly comprises a second servo motor and a fourth synchronous pulley fixedly connected to the output end of the second servo motor, the third synchronous pulley and the fourth synchronous pulley are located in positions corresponding to each other and are connected by a second synchronous belt.

[0019] Specifically, the rectangular support sliding table comprises a fixed seat fixedly connected to the top of the support bottom plate, a first fixed shaft with an irregular shaft diameter is horizontally slidably connected to the inner wall of the fixed seat, a first spring is fixedly connected between the surface of the fixed seat and the first fixed shaft, and a second fixed shaft is symmetrically arranged on the surface of the fixed seat and is threadedly connected to a clamping block on the surface of the second fixed shaft.

[0020] The fixed seat is used for fixing a floating strip support bracket, wherein the floating strip support bracket comprises a transverse bottom plate and an L-shaped side plate, the transverse bottom plate is fixedly connected to the top of the fixed seat, the L-shaped side plate is symmetrically and reversely horizontally slidably connected to the inner wall of the transverse bottom plate, the L-shaped side plate is sleeved outside the second fixed shaft and is fixedly connected to a limiting spring between the surface of the L-shaped side plate and the clamping block, and one end of the L-shaped side plate located inside the transverse bottom plate penetrates into the inside of the fixed seat and is fixedly connected to a cam, and the cam is slidably connected to the surface of the first fixed shaft.

[0021] Specifically, a first photoelectric sensor and an optical fiber sensor are respectively arranged on the support bottom plate and the L-shaped side plate.

[0022] Specifically, the frame guiding unit comprises a fixed bottom plate and a guiding bottom plate fixedly connected to the top of the fixed bottom plate, wherein,

[0023] The fixed guide rail is fixedly connected to the top of the guide base plate, the slide rail assembly is arranged on the surface of the guide base plate, and the movable slide table is arranged on the slide rail assembly, the floating guide rail is fixedly connected to the top of the movable slide table, the Y-direction push rod cylinder is arranged on the surface of the movable slide table and corresponds to the position of the first fixed shaft, the first jacking cylinder is arranged on the top of the fixed base plate and is fixedly connected to one end of the surface of the movable slide table through the connecting plate, the Y-direction push rod cylinder and the floating guide rail can reciprocate along the Z-axis direction under the driving of the first jacking cylinder, the limiting support is fixedly connected to the top of the first jacking cylinder and is located outside the connecting plate, the limiting support is screw-connected to the surface of the fixed guide rail through the screw rod, and the limiting block is screw-connected to the inner wall of the limiting support and is in abutting connection with the top of the connecting plate.

[0024] Specifically, the frame traction unit comprises a side support seat, a positioning block, a Y-axis transmission module, a jacking fixed plate and a jacking cylinder assembly.

[0025] The side support seat is fixedly connected to the top of the transmission base plate and is close to one side of the press end, the positioning block is in abutting connection with the surface of the side support seat and is fixedly connected to the top of the transmission base plate through bolts, the Y-axis transmission module is fixedly connected to the surface of the side support seat, the Y-axis transmission module is provided with a clamping jaw fixed plate on the surface, and a wire dragging chain is arranged on one side of the bottom of the Y-axis transmission module and connected to the bottom of the clamping jaw fixed plate through a wire fixing frame.

[0026] The jacking fixed plate is fixedly connected to the top of the clamping jaw fixed plate, the jacking cylinder assembly is fixedly connected to the top of the jacking fixed plate, and the output end of the jacking cylinder assembly is connected with the electric cylinder assembly.

[0027] Specifically, the output end of the jacking cylinder assembly is fixedly connected with an adapter plate and is sleeved outside a guide shaft located on the top of the jacking fixed plate, a wire protection plate is fixedly connected to the top of one end of the adapter plate away from the jacking cylinder assembly, the electric cylinder assembly is fixedly connected to the inner wall of the wire protection plate, and the output end of the electric cylinder assembly is fixedly connected with a clamping jaw.

[0028] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description, or can be learned by practice of the application.

[0029] Compared with the prior art, the beneficial effects of the present application are:

[0030] 1. Solve the core jitter problem and avoid wire deformation and product scrap: when the traditional equipment transports the lead frame by pushing rod or belt friction, the frame is easy to shake due to uncontrollable friction resistance, which causes wire deformation, wire collapse, chip short circuit or performance degradation. The invention cooperates the design of the frame traction unit and the clamping unit, and uses the electric cylinder assembly to drive the clamping jaw to accurately clamp the front end of the lead frame, replacing the traditional friction transmission: the opening and closing action of the clamping jaw is stable and controllable, and cooperates with the smooth translation of the traction unit along the Y axis and the accurate positioning of the Z axis, realizing the "non-jitter handling" of the lead frame, and fundamentally avoiding the wire deformation problem caused by jitter, significantly reducing the product scrap rate;

[0031] 2. Adapt to high pin, multi-wire frame, and improve the applicability of complex scenes: the traditional equipment is easy to cause frame deviation and collision when handling high pin, multi-wire lead frame due to insufficient structural rigidity or low positioning accuracy. The invention realizes self-adaptive adjustment through the floating strip support bracket of the frame alignment unit: the L-shaped side plate can be opened and closed adaptively with the frame size (driven by the Y-direction push rod air cylinder) through the sliding cooperation of the cam and the first fixed shaft, and cooperates with the elastic buffer of the limiting spring to stably bear the frame and compatible with high pin frames of different specifications. At the same time, the floating guide rail of the frame guide unit can compensate the positioning error along the Z axis, ensuring that the frame always maintains a stable posture during guiding, transmission and alignment, greatly improving the adaptability to complex structure lead frame;

[0032] 3. Optimize the feeding process and improve the automation efficiency and positioning accuracy: in the traditional process, frame transportation and alignment are carried out in steps, which is easy to affect the efficiency due to the connection error. The invention constructs an integrated process of "guiding-traction-alignment-handling": after the external push rod pushes the frame into the guide unit, the traction unit drives the clamping unit to grab the frame and moves it to the alignment unit, and after the alignment is completed, the handling unit directly moves it to the waiting position, reducing the intermediate links. At the same time, multiple sensors (such as first photoelectric sensor, optical fiber sensor, U-shaped photoelectric sensor) are equipped in each unit to detect the frame position, rotation angle and arrival state in real time, and cooperate with the transmission screw driven by the servo motor (with a positioning accuracy of millimeter level) to realize automatic and accurate control of the whole process, and the feeding efficiency is improved by more than 30% compared with the traditional equipment;

[0033] 4. Modular design, stability and maintenance convenience: traditional equipment structure integration is low, component debugging and maintenance is complex, the application adopts a modular layout based on a transmission bottom plate: frame carrying unit, alignment unit, guide unit, etc. independent modules have clear division of labor, and fast assembly and disassembly are realized through standardized interfaces (such as the connection of linear bearing seat and stand, synchronous belt wheel transmission structure), for example, the cooperation of the horizontal guide rail and the slider of the frame carrying unit, the transmission screw and the linear bearing seat, which not only ensures the stability of movement, but also facilitates the replacement of worn parts; the floating guide rail and the fixed guide rail of the frame guide unit are designed separately, the Z-axis height can be adjusted independently, and the maintenance cost in the later period is reduced;

[0034] 5. Realize rotation and translation coordination, expand process adaptability: the traditional rotary platform is fixed in a certain position, it is difficult to consider "rotary positioning" and "translation feeding", the frame carrying unit of the application can drive the frame alignment unit to realize "rotation around Z axis 180°" and "translation along Y axis": through the first servo motor to drive the transmission screw to realize translation, the second servo motor drives the hollow transmission shaft through the synchronous belt wheel to realize rotation, and the precise positioning of the U-shaped photoelectric sensor meets the complex process requirements of the lead frame in the test flow, such as "rotary turning" and "multi-station transfer", without the need for additional equipment assistance, simplifying the production line layout, in summary, the application not only solves the core defects of traditional technology, but also realizes the "stabilization, precision, automation and generalization" of lead frame carrying through structural innovation and process optimization, providing efficient and reliable equipment support for semiconductor plastic packaging production. BRIEF DESCRIPTION OF DRAWINGS

[0035] The above and / or additional aspects and advantages of the application will become apparent and more readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0036] Figure 1 FIG. 1 is a structural schematic diagram of a mobile rotary platform for lead frame carrying according to the application;

[0037] Figure 2 FIG. 3 is a structural schematic diagram of a frame guide unit in the mobile rotary platform for lead frame carrying according to the application;

[0038] Figure 3 FIG. 5 is a perspective structural schematic diagram of a frame alignment unit in the mobile rotary platform for lead frame carrying according to the application;

[0039] Figure 4 FIG. 6 is a top view structural schematic diagram of the frame alignment unit in the mobile rotary platform for lead frame carrying according to the application;

[0040] Figure 5 FIG. 7 is a structural schematic diagram of a frame traction unit in the mobile rotary platform for lead frame carrying according to the application;

[0041] Figure 6 Structure diagram of a frame clamping unit in a mobile rotary platform for lead frame carrying according to the present application;

[0042] Figure 7 Structure diagram of a frame carrying unit in a mobile rotary platform for lead frame carrying according to the present application.

[0043] As shown in the figure: 100, transmission base plate; 200, frame guiding unit; 300, frame alignment unit; 400, frame traction unit; 500, frame clamping unit; 600, frame carrying unit;

[0044] 201, fixed base plate; 202, guiding base plate; 203, slide rail assembly; 204, mobile slide table; 205, first lifting cylinder; 206, connecting plate; 207, limiting block; 208, fixed guide rail; 209, floating guide rail; 210, Y-direction push rod cylinder;

[0045] 301, base plate; 302, hollow transmission shaft; 303, U-shaped photoelectric sensor; 304, second servo motor; 305, motor mounting plate; 306, fourth synchronous pulley; 307, second synchronous belt; 308, third synchronous pulley; 309, support base plate; 310, fixed seat; 311, first fixed shaft; 312, first photoelectric sensor; 313, second fixed shaft; 314, transverse base plate; 315, L-shaped side plate; 316, limiting spring; 317, cam; 318, clamping block; 319, optical fiber sensor;

[0046] 401, side support seat; 402, positioning block; 403, Y-axis transmission module; 404, clamping jaw fixing plate; 405, wiring fixing frame; 406, wiring drag chain;

[0047] 501, lifting fixed plate; 502, wiring groove frame; 503, lifting cylinder assembly; 504, adapter plate; 505, height adjusting bolt; 506, wiring guard plate; 507, electric cylinder assembly; 508, clamping jaw;

[0048] 601, transmission screw; 602, first synchronous pulley; 603, first synchronous belt; 604, second synchronous pulley; 605, first servo motor; 606, slot photoelectric sensor; 607, horizontal guide rail; 608, linear bearing seat; 609, stand column. DETAILED DESCRIPTION

[0049] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components have the same or similar designations throughout the various figures. The embodiments described below are exemplary and are intended to be illustrative of the present application, and are not to be construed as limiting the present application. Rather, the embodiments of the present application encompass all changes, modifications and equivalents that fall within the spirit and scope of the appended claims.

[0050] A mobile rotating platform for lead frame carrying is described below as an embodiment of the present application.

[0051] As shown in Figures 1-7 A mobile rotating platform for lead frame carrying is described below as an embodiment of the present application.

[0052] A transmission base plate 100;

[0053] A frame carrying unit 600 is arranged on the top of the transmission base plate 100, and is used to drive the frame alignment unit 300 to perform rotating positioning around the Z axis and translation feeding along the Y axis;

[0054] The frame alignment unit 300 is arranged on the frame carrying unit 600, and is used to carry the lead frame, and includes a rotating positioning platform, and a rectangular support slide table is symmetrically arranged on the top of the rotating positioning platform;

[0055] The frame guiding unit 200 is arranged on the top of the transmission base plate 100, and is located on one side of the rectangular support slide table, and includes a fixed guide rail 208 and a floating guide rail 209, wherein the floating guide rail 209 can be adjusted in the Z axis direction to realize the alignment compensation;

[0056] The frame pulling unit 400 is arranged on the top of the transmission base plate 100, and is located on one side of the frame carrying unit 600, and is used to drive the frame clamping unit 500 to perform lifting alignment along the Z axis and translation feeding along the Y axis;

[0057] The frame clamping unit 500 is arranged on the frame pulling unit 400, and includes an electric cylinder assembly 507 and a clamping jaw 508, and the opening and closing action of the clamping jaw 508 is realized by the driving of the electric cylinder assembly 507 to complete the grabbing and releasing of the lead frame.

[0058] Specifically, the present application is reasonable in structure. In the automatic encapsulation and loading process, after the lead frame is pushed into the frame guide unit 200 by the external push rod, the frame pulling unit 400 drives the frame clamping unit 500 to clamp the front end of the strip, and then drives the lead frame to move to the frame alignment unit 300, and then moves the aligned lead frame to the waiting position through the frame carrying unit 600, and waits for the subsequent process. The present application changes the current lead frame loading process, solves the problem of lead frame shaking caused by mechanical hand grabbing or push rod pushing in the traditional encapsulation and automatic loading process, and avoids the deformation of the soldering wire on the lead frame caused by shaking, thereby avoiding the product scrap.

[0059] The operation steps are as follows:

[0060] S1: Lead frame pushing out: when the frame pulling unit 400 is in the waiting position, the frame clamping unit 500 is located at the top of the fixed guide rail 208 on one side, and the clamping jaw 508 is in the default open state. After the lead frame is pushed out by the external push rod, it reaches the fixed guide rail 208;

[0061] S2: Lead frame first pulling: the frame clamping unit 500 is lowered, the frame pulling unit 400 moves towards the fixed guide rail 208, after the lead frame completely matches the clamping jaw 508, the electric cylinder assembly 507 drives the clamping jaw 508 to close and clamp the strip, in this process, the frame carrying unit 600 drives the frame alignment unit 300 to move towards the fixed guide rail 208, and stops after moving to the servo set strip receiving position. The first lifting cylinder 205 in the frame guide unit 200 drives the floating guide rail 209 to rise to the same height as the fixed guide rail 208 along the Z-axis direction, so that the fixed guide rail 208, the floating guide rail 209 and the floating strip support bracket on the frame alignment unit 300 are at the same height. The Y-direction push rod cylinder 210 on the frame guide unit 200 pushes out, pushing the first fixed shaft 311 with irregular shaft diameter in the frame alignment unit 300 to move inward, the cam 317 on both sides of the shaft also increases the relative distance as the shaft diameter of the first fixed shaft 311 increases, so that the floating bracket gap increases, facilitating the better positioning of the lead frame. After the completion of this action, the frame pulling unit 400 moves in the opposite direction of the fixed guide rail 208, the frame clamping unit 500 pulls the lead frame into the floating support bracket in the frame alignment unit 300. After the clamping jaw 508 of the frame clamping unit 500 opens and releases the lead frame, the Y-direction push rod cylinder 210 in the frame guide unit 200 is retracted, the floating bracket gap is reduced to help the lead frame alignment, and the frame clamping unit 500 is driven by the lifting cylinder assembly 503 to rise as a whole. The first lifting cylinder 205 in the Z-axis direction is lowered, driving the floating guide rail 209 to descend to the safe waiting position, and then the lead frame alignment unit 300 rotates 180° in place;

[0062] S3: Lead frame secondary traction: The lifting cylinder assembly 503 in the frame traction unit 400 is lowered, the frame traction unit 400 moves towards the fixed guide rail 208, the lead frame is completely attached to the clamping jaw 508, the clamping jaw 508 is closed and clamps the lead frame, the Y-direction push rod cylinder 210 in the frame guide unit 200 is pushed out, the first fixed shaft 311 with an irregular shaft diameter in the floating support in the frame alignment unit 300 moves inward, the distance between the two cams 317 increases as the diameter of the fixed shaft increases, and the gap between the floating supports increases. After this action is completed, the frame traction unit 400 moves in the opposite direction of the fixed guide rail 208, the frame clamping unit 500 pulls the lead frame into the floating support in the frame alignment unit 300, and the clamping jaw 508 of the subsequent frame clamping unit 500 opens to release the lead frame. The Y-direction push rod cylinder 210 in the frame guide unit 200 is retracted, the gap between the floating supports is reduced, the lead frame is aligned, the lifting cylinder assembly 503 drives the lead frame clamping unit 500 to rise as a whole; the first lifting cylinder 205 in the Z-axis direction is lowered, and the floating guide rail 209 is lowered to a safe waiting position;

[0063] S4: Lead frame transportation: The linear bearing seat 608 in the frame transportation unit 600 moves to the waiting position along the screw mounting direction under the drive of the first servo motor 605 and the pulley transmission.

[0064] In one embodiment of the present application, as shown in Figure 7 The frame transportation unit 600 includes a transmission screw 601, a first servo motor 605, and a linear bearing seat 608. The transmission screw 601 is rotationally connected at the center of the top of the transmission base plate 100, and symmetrical horizontal guide rails 607 are provided outside the transmission screw 601. Two sets of horizontal guide rails 607 are each horizontally slidably connected with a sliding block at the top.

[0065] The first servo motor 605 is fixedly connected to the top of the transmission base plate 100 and located outside the horizontal guide rails 607. The transmission screw 601 has a first synchronous pulley 602 and a second synchronous pulley 604 respectively provided at the corresponding positions of the surface of one end of the transmission screw 601 and the output surface of the first servo motor 605, and is connected by a first synchronous belt 603. The linear bearing seat 608 is fixedly connected to the top of the sliding block and threadedly connected to the outer surface of the transmission screw 601. The linear bearing seat 608 has four vertical columns 609 provided at the top and connected with the bottom of the rotary positioning platform.

[0066] It should be noted that the top of the transmission backplane 100 described in the embodiment is also provided with a slot-shaped photoelectric sensor 606, which is located outside the horizontal guide rail 607 and plays a positioning role. The slot-shaped photoelectric sensor 606 is provided in two groups, and the two groups of slot-shaped photoelectric sensors 606 are respectively limit position sensors and origin position sensors. The side surface of the linear bearing seat 608 is fixedly connected with a stainless steel sheet, which plays a role of light shielding. When the linear bearing seat 608 moves to the position of the slot-shaped photoelectric sensor 606, the sensor outputs a position signal, and the linear bearing seat 608 stops moving.

[0067] Specifically, after the first servo motor 605 is started, the synchronous belt and the synchronous pulley drive the transmission screw rod 601 to rotate. The rotary motion of the transmission screw rod 601 is converted into the horizontal linear motion of the linear bearing seat 608 through threaded transmission. The horizontal guide rail 607 and the sliding block play a guiding and supporting role for the motion of the linear bearing seat 608. When the linear bearing seat 608 moves to the set position origin or limit position, the slot-shaped photoelectric sensor 606 detects the light shielding signal, and the control system makes the linear bearing seat 608 stop moving. The linear bearing seat 608 drives the rotary positioning platform to move together through the top stand 609, thereby realizing the carrying function of the frame. This structure provides accurate power through the first servo motor 605, realizes precise displacement through the transmission of the transmission screw rod 601, and realizes accurate carrying and positioning of the frame through the positioning control of the slot-shaped photoelectric sensor 606.

[0068] In one embodiment of the present application, as shown in Figures 3-4 The rotary positioning platform includes a base plate 301, a hollow transmission shaft 302 is rotatably connected to the inner wall of a hole groove in the center of the base plate 301, a support bottom plate 309 is fixedly connected to the top of the hollow transmission shaft 302, and a rectangular support sliding table is symmetrically arranged on the top of the support bottom plate 309. The bottom of the hollow transmission shaft 302 is fixedly connected with a third synchronous pulley 308.

[0069] One end of the base plate 301 is fixedly connected with a servo power assembly through a motor mounting plate 305. The servo power assembly includes a second servo motor 304 and a fourth synchronous pulley 306 fixedly connected to the output end of the second servo motor 304. The third synchronous pulley 308 corresponds in position to the fourth synchronous pulley 306 and is connected through a second synchronous belt 307.

[0070] It should be noted that the top of the base plate 301 described in the embodiment is also provided with a U-shaped photoelectric sensor 303. A stainless steel sheet is fixedly connected to the bottom of the support bottom plate 309. After the support bottom plate 309 is rotated by 180°, the stainless steel sheet will shield the U-shaped photoelectric sensor 303, thereby providing an output signal for the rotation of the support bottom plate 309 to the position.

[0071] Specifically, after the second servo motor 304 is started, the fourth synchronous pulley 306 is driven to rotate through the output end, the fourth synchronous pulley 306 drives the third synchronous pulley 308 to rotate through the second synchronous belt 307, and in turn drives the hollow transmission shaft 302 to rotate, the hollow transmission shaft 302 drives the top support base plate 309 and the upper rectangular support sliding table to rotate as a whole, when the support base plate 309 rotates to the 180° position, the stainless steel sheet at the bottom thereof shields the light path of the U-shaped photoelectric sensor 303, after the U-shaped photoelectric sensor 303 detects the shielding signal, a rotation to position signal is output, and the control system can control the second servo motor 304 to stop or perform the next action according to the signal, this structure provides accurate rotating power through the second servo motor 304, realizes stable rotating motion through the second synchronous belt 307 transmission, and realizes accurate positioning of 180° rotation through the U-shaped photoelectric sensor 303, and is suitable for carrying scenes that need to overturn or rotate workpieces by a specific angle.

[0072] In one embodiment of the present application, as shown in Figures 3-4 The rectangular support sliding table comprises a fixed seat 310 fixedly connected to the top of the support base plate 309, a first fixed shaft 311 with an irregular shaft diameter is horizontally slidably connected to the inner wall of the fixed seat 310, and a first spring is fixedly connected between the surface of the fixed seat 310 and the first fixed shaft 311, the second fixed shaft 313 is symmetrically arranged on the surface of the fixed seat 310, and the surface of the second fixed shaft 313 is threadedly connected with a clamping block 318.

[0073] The fixed seat 310 is used for fixing a floating strip support bracket, wherein the floating strip support bracket comprises a transverse bottom plate 314 and an L-shaped side plate 315, the transverse bottom plate 314 is fixedly connected to the top of the fixed seat 310, the L-shaped side plate 315 is symmetrically and reversely horizontally slidably connected to the inner wall of the transverse bottom plate 314, the L-shaped side plate 315 is sleeved outside the second fixed shaft 313 and is fixedly connected with a limiting spring 316 between the surface of the L-shaped side plate 315 and the surface of the clamping block 318, one end of the L-shaped side plate 315 located inside the transverse bottom plate 314 penetrates into the inside of the fixed seat 310 from the bottom and is fixedly connected with a cam 317, and the cam 317 is slidably connected with the surface of the first fixed shaft 311.

[0074] Specifically, the rectangular support sliding table drives the opening and closing action of the L-shaped side plate 315 through the axial movement of the first fixed shaft 311, realizes the adaptive support of the workpiece, and the specific process is as follows: when the first fixed shaft 311 is subjected to external force (such as external pushing) and slides in the horizontal direction, because the shaft diameter is irregular, the diameter change at different positions will push the two sides of the cam 317 to produce radial displacement, the displacement of the cam 317 drives the L-shaped side plate 315 to slide horizontally outward along the transverse bottom plate 314, at this time the limiting spring 316 is compressed, and the elastic potential energy is stored; when the external force disappears, the first spring pushes the first fixed shaft 311 to reset, the cam 317 is reset accordingly, and the L-shaped side plate 315 restores to the initial state under the action of the limiting spring 316, the rotating supporting block 318 can change its position on the second fixed shaft 313, adjust the initial compression amount of the limiting spring 316, and thus adjust the clamping force or support stability of the L-shaped side plate 315 on the workpiece. The structure realizes the adaptive adaptation to workpieces of different sizes through the "floating type" design (spring provides buffer, parts can slide), and at the same time uses mechanical transmission (irregular shaft diameter + cam 317) to ensure the synchronism and accuracy of the action. This design can not only stably support the workpiece, but also buffer the external force through the elastic element to avoid damaging the workpiece, and is suitable for automatic handling or processing scenes that require flexible positioning.

[0075] In an embodiment of the present application, as shown in Figures 3-4 The bracket bottom plate 309 and the L-shaped side plate 315 are respectively provided with a first photoelectric sensor 312 and a fiber sensor 319.

[0076] Specifically, the first photoelectric sensor 312 and the fiber sensor 319 are arranged to detect whether the lead frame is carried into position, which significantly improves the speed of lead frame feeding.

[0077] In an embodiment of the present application, as shown in Figure 2 The frame guiding unit 200 includes a fixed bottom plate 201 and a guide bottom plate 202 fixedly connected to the top of the fixed bottom plate 201, wherein,

[0078] A fixed guide rail 208 is fixedly connected to the top of the guide base plate 202. A slide rail assembly 203 is provided on the surface of the guide base plate 202, and a movable slide table 204 is provided on the slide rail assembly 203. A floating guide rail 209 is fixedly connected to the top of the movable slide table 204. A Y-axis push rod cylinder 210 is provided on the surface of the movable slide table 204 and corresponds to the position of the first fixed shaft 311. A first lifting cylinder 205 is provided on the top of the fixed base plate 201 and is fixedly connected to one end surface of the movable slide table 204 through a connecting plate 206. The Y-axis push rod cylinder 210 and the floating guide rail 209 can reciprocate along the Z-axis direction under the drive of the first lifting cylinder 205. A limit bracket is fixedly connected to the top of the first lifting cylinder 205 and is located outside the connecting plate 206. The limit bracket is threadedly connected to the surface of the fixed guide rail 208 through a screw. A limit block 207 is threadedly connected to the inner wall of the limit bracket and abuts against the top of the connecting plate 206.

[0079] Specifically, the frame guiding unit 200 guides the frame through coordinated movement in both the horizontal (Y-axis) and vertical (Z-axis) directions. The specific process is as follows: Z-axis movement: When the first lifting cylinder 205 extends or retracts, it drives the moving slide 204 to rise and fall along the slide rail assembly 203 in the vertical direction (Z-axis) via the connecting plate 206. At the same time, the Y-axis push rod cylinder 210 and the floating guide rail 209 rise and fall synchronously with the moving slide 204. The limiting block 207 precisely limits the maximum lifting height by abutting against the connecting plate 206, ensuring that the movement range is controllable. Y-axis horizontal movement: The Y-axis push rod cylinder 210 can extend and retract independently. Its push rod is aligned with the first fixed shaft 311 of the rectangular support slide. When the push rod extends, it pushes the first fixed shaft 311 to slide. Furthermore, the L-shaped side plate 315 is opened and closed via the cam 317 (to clamp or release the frame). The coordinated action is as follows: the height (Z-axis) of the moving slide 204 is adjusted by the first lifting cylinder 205, and the horizontal thrust (Y-axis) of the Y-axis push rod cylinder 210 is used to adapt to frames of different heights and positions, achieving precise guidance and positioning. This unit is powered by cylinders, combined with guide rails to achieve stable guidance, and with the help of limiting components to ensure motion accuracy. At the same time, it is linked with the first fixed axis 311 of the rectangular support slide to form a complete "guide-support" coordinated mechanism. This design is suitable for the precise transfer, positioning or docking of frame-type workpieces in automated production lines, and has the characteristics of flexible movement, convenient adjustment and precise positioning.

[0080] In one embodiment of the present invention, such as Figures 5-6 As shown, the frame traction unit 400 includes a side support 401, a positioning block 402, a Y-axis transmission module 403, a lifting fixing plate 501, and a lifting cylinder assembly 503, wherein,

[0081] The side support base 401 is fixedly connected to the top of the transmission bottom plate 100 and close to the side of the press end, the positioning block 402 is abuttingly connected to the surface of the side support base 401 and is fixedly connected to the top of the transmission bottom plate 100 through a bolt, the Y-axis transmission module 403 is fixedly connected to the surface of the side support base 401, the Y-axis transmission module 403 is provided with a clamping jaw fixing plate 404 on the surface, a wiring drag chain 406 is arranged on one side of the bottom of the Y-axis transmission module 403 and is connected to the bottom of the clamping jaw fixing plate 404 through a wiring fixing frame 405;

[0082] The jacking fixed plate 501 is fixedly connected to the top of the clamping jaw fixing plate 404, the jacking cylinder assembly 503 is fixedly connected to the top of the jacking fixed plate 501, and the output end of the jacking cylinder assembly 503 is connected with the electric cylinder assembly 507.

[0083] It should be noted that the Y-axis transmission module 403 described in this embodiment is prior art, and therefore will not be described here.

[0084] Specifically, the frame traction unit 400 realizes traction and position adjustment of the frame through the cooperation of horizontal (Y-axis) and vertical (Z-axis) movements, and the specific process is as follows:

[0085] Y-axis direction movement: after the Y-axis transmission module 403 is started, the clamping jaw fixing plate 404 is driven to move horizontally along the Y-axis, driving the jacking fixed plate 501, the jacking cylinder assembly 503 and the electric cylinder assembly 507 at the top to move synchronously, realizing horizontal direction position adjustment; the wiring drag chain 406 moves with the clamping jaw fixing plate 404, synchronously receiving or releasing the pipeline.

[0086] Z-axis direction movement: when the jacking cylinder assembly 503 is extended or retracted, the electric cylinder assembly 507 is driven to move vertically, realizing vertical direction position adjustment, so that the electric cylinder assembly 507 (end effector) can accurately dock with frames of different heights.

[0087] Traction action: after the electric cylinder assembly 507 reaches the frame position under the cooperation of Y-axis and Z-axis movements, the electric cylinder assembly 507 realizes the grasping, traction or transfer of the frame through its own driving structure (such as the opening and closing or pushing action of the clamping jaw 508), and completes the traction task.

[0088] In one embodiment of the present application, as shown in Figure 5 The output end surface of the jacking cylinder assembly 503 is fixedly connected with an adapter plate 504, which is sleeved outside the guide shaft located at the top of the jacking fixed plate 501, the top of one end of the adapter plate 504 away from the jacking cylinder assembly 503 is fixedly connected with a wiring guard plate 506, the electric cylinder assembly 507 is fixedly connected to the inner wall of the wiring guard plate 506, and the output end of the electric cylinder assembly 507 is fixedly connected with a clamping jaw 508.

[0089] It should be noted that the electric cylinder assembly 507 described in this embodiment is an electric gripper.

[0090] It should also be noted that the clamping jaw 508 described in this embodiment includes an upper clamping jaw and a lower clamping jaw.

[0091] It should be noted that the jacking fixed plate 501 described in this embodiment further comprises a wiring slot frame 502 fixedly connected to the bottom of the jacking fixed plate 501, for installing air pipes and sensor lines.

[0092] It should be noted that the wiring guard plate 506 described in this embodiment further comprises an adjusting height bolt 505, and the electric cylinder assembly 507 has a certain deviation from the design due to assembly and processing errors, and the height needs to be fine-tuned through the adjusting height bolt 505 to ensure that the electric cylinder assembly 507 remains horizontal during clamping the lead frame.

[0093] Specifically, this part of the structure realizes accurate grabbing and transferring of the frame through the cooperation of "cylinder driving + guide shaft guiding + electric cylinder precise control", and the specific process is as follows: when the jacking cylinder assembly 503 extends and retracts, the whole structure is driven to move vertically along the guide shaft through the adapter plate 504, the height of the clamping jaw 508 is adjusted to align with the grabbing position of the frame; the electric cylinder assembly 507 drives the clamping jaw 508 to complete the opening and closing action according to the control signal under the protection of the wiring guard plate 506, realizing the grabbing or releasing of the frame; during the whole process, the guide shaft ensures the stability of the vertical movement, the wiring guard plate 506 protects the pipeline safety, and the electric cylinder assembly 507 ensures the accuracy of the action of the clamping jaw 508 such as grabbing force and displacement.

[0094] In summary, the mobile rotary platform for lead frame carrying according to the embodiment of the present application has a reasonable structure, in the automatic packaging and testing feeding process, after the lead frame is pushed into the frame guiding unit 200 by the external push rod, the frame clamping unit 500 is driven by the frame pulling unit 400 to clamp the front end of the strip, and then the lead frame is moved to the frame alignment unit 300, and then the lead frame after alignment is moved to the waiting position by the frame carrying unit 600, waiting for the subsequent process flow. The present application changes the current lead frame feeding process, solves the problem of lead frame shaking caused by mechanical hand grabbing or push rod pushing in the traditional packaging and testing automatic equipment feeding process, and avoids the deformation of the welding wire on the lead frame caused by shaking, thereby avoiding product scrap.

[0095] In the description of the present application, the terms "first", "second", etc. are used only to describe the purpose and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0096] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the skilled person in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0097] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and modifications to the above-described embodiments within the scope of the present application.

Claims

1. A mobile rotary platform for handling lead frames, characterized in that, include: Transmission base plate (100); Frame transport unit (600): disposed on the top of the transmission base plate (100), used to drive the frame alignment unit (300) to perform rotational positioning around the Z-axis and translational feeding along the Y-axis; Frame aligning unit (300): disposed on the frame transport unit (600) for carrying the lead frame, comprising a rotary positioning platform, wherein rectangular support slides are symmetrically arranged on the top of the rotary positioning platform; Frame guiding unit (200): It is set on the top of the transmission base plate (100) and located on one side of the rectangular support slide. It includes a fixed guide rail (208) and a floating guide rail (209). The floating guide rail (209) can be adjusted up and down along the Z-axis to achieve alignment compensation. Frame traction unit (400): disposed on the top of the transmission base plate (100) and located on one side of the frame handling unit (600), used to drive the frame clamping unit (500) to perform lifting and positioning along the Z-axis and translational conveying along the Y-axis; Frame clamping unit (500): disposed on the frame traction unit (400), which includes an electric cylinder assembly (507) and a gripper (508). The opening and closing action of the gripper (508) is realized by driving the electric cylinder assembly (507) to complete the gripping and releasing of the lead frame.

2. The mobile rotary platform for handling lead frames according to claim 1, characterized in that, The frame transport unit (600) includes a transmission screw (601), a first servo motor (605) and a linear bearing seat (608). The transmission screw (601) is rotatably connected to the top center of the transmission base plate (100), and horizontal guide rails (607) are symmetrically arranged on its outer side. The top of both sets of horizontal guide rails (607) are horizontally slidably connected to sliders. The first servo motor (605) is fixedly connected to the top of the transmission base plate (100) and located outside the horizontal guide rail (607). The first synchronous pulley (602) and the second synchronous pulley (604) are respectively provided at the corresponding positions of the output end surface of the first servo motor (605) on one end surface of the transmission screw (601) and connected to each other through the first synchronous belt (603). The linear bearing seat (608) is fixedly connected to the top of the slider and threaded to the outer surface of the transmission screw (601). The top of the linear bearing seat (608) is provided with four sets of columns (609) and connected to the bottom of the rotary positioning platform.

3. The mobile rotary platform for handling lead frames according to claim 2, characterized in that, The rotary positioning platform includes a base plate (301), a slot is provided in the center of the base plate (301), and a hollow drive shaft (302) is rotatably connected to the inner wall of the slot. A support base plate (309) is fixedly connected to the top of the hollow drive shaft (302), and a rectangular support slide is symmetrically arranged on the top of the support base plate (309). A third synchronous pulley (308) is fixedly connected to the bottom of the hollow drive shaft (302). The base plate (301) has a servo power component fixedly connected to one end of the bottom via a motor mounting plate (305). The servo power component includes a second servo motor (304) and a fourth synchronous pulley (306) fixedly connected to the output end of the second servo motor (304). The third synchronous pulley (308) corresponds to the fourth synchronous pulley (306) and is connected to it via a second synchronous belt (307).

4. The mobile rotary platform for handling lead frames according to claim 3, characterized in that, The rectangular support slide includes a fixed seat (310) fixedly connected to the top of the bracket base plate (309). The inner wall of the fixed seat (310) is horizontally slidably connected to a first fixed shaft (311) with an irregular diameter, and a first spring is fixedly connected between the fixed seat (310) and the surface of the fixed seat (310). The surface of the fixed seat (310) is symmetrically provided with a second fixed shaft (313), and the surface of the second fixed shaft (313) is threaded with a support block (318). The fixed seat (310) is used to fix the floating strip support bracket, wherein the floating strip support bracket includes a horizontal base plate (314) and an L-shaped side plate (315). The horizontal base plate (314) is fixedly connected to the top of the fixed seat (310). The L-shaped side plate (315) is symmetrically and horizontally slidably connected to the inner wall of the horizontal base plate (314). The L-shaped side plate (315) is sleeved on the outside of the second fixed shaft (313) and a limit spring (316) is fixedly connected between it and the surface of the support block (318). The bottom of one end of the L-shaped side plate (315) located inside the horizontal base plate (314) penetrates into the interior of the fixed seat (310) and is fixedly connected to a cam (317). The cam (317) is slidably connected to the surface of the first fixed shaft (311).

5. The mobile rotary platform for handling lead frames according to claim 4, characterized in that, The first photoelectric sensor (312) and the fiber optic sensor (319) are respectively installed on the base plate (309) and L-shaped side plate (315) of the bracket.

6. The mobile rotary platform for handling lead frames according to claim 4, characterized in that, The frame guide unit (200) includes a fixed base plate (201) and a guide base plate (202) fixedly connected to the top of the fixed base plate (201), wherein, The top of the guide base plate (202) is fixedly connected to a fixed guide rail (208). A slide rail assembly (203) is provided on the surface of the guide base plate (202), and a movable slide table (204) is provided on the slide rail assembly (203). A floating guide rail (209) is fixedly connected to the top of the movable slide table (204). A Y-axis push rod cylinder (210) is provided on the surface of the movable slide table (204) and corresponds to the position of the first fixed shaft (311). The top of the fixed base plate (201) is provided with a first lifting cylinder (205), and it is connected to the connecting plate (206). The Y-axis push rod cylinder (210) and the floating guide rail (209) are fixedly connected to one end surface of the movable slide (204). The movable slide (204) and the floating guide rail (209) can reciprocate along the Z-axis direction under the drive of the first lifting cylinder (205). The top of the first lifting cylinder (205) is fixedly connected to a limit bracket and located outside the connecting plate (206). The limit bracket is threadedly connected to the surface of the fixed guide rail (208) through a screw. The inner wall of the limit bracket is threadedly connected to a limit block (207) and abuts against the top of the connecting plate (206).

7. The mobile rotary platform for handling lead frames according to claim 1, characterized in that, The frame traction unit (400) includes a side support (401), a positioning block (402), a Y-axis transmission module (403), a lifting fixing plate (501), and a lifting cylinder assembly (503), wherein, The side support base (401) is fixedly connected to the top of the transmission base plate (100) and close to the press end. The positioning block (402) is abutted against the surface of the side support base (401) and fixedly connected to the top of the transmission base plate (100) by bolts. The Y-axis transmission module (403) is fixedly connected to the surface of the side support base (401). The surface of the Y-axis transmission module (403) is provided with a gripper fixing plate (404). A cable drag chain (406) is provided on one side of the bottom of the Y-axis transmission module (403) and is connected to the bottom of the gripper fixing plate (404) through a cable fixing frame (405). The lifting fixing plate (501) is fixedly connected to the top of the gripper fixing plate (404), the lifting cylinder assembly (503) is fixedly connected to the top of the lifting fixing plate (501), and the output end of the lifting cylinder assembly (503) is connected to the electric cylinder assembly (507).

8. The mobile rotary platform for handling lead frames according to claim 7, characterized in that, An adapter plate (504) is fixedly connected to the output end surface of the lifting cylinder assembly (503) and sleeved on the outside of the guide shaft located at the top of the lifting fixed plate (501). A cable guide plate (506) is fixedly connected to the top of the end of the adapter plate (504) away from the lifting cylinder assembly (503). The electric cylinder assembly (507) is fixedly connected to the inner wall of the cable guide plate (506). A gripper (508) is fixedly connected to the output end of the electric cylinder assembly (507).

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