Lead frame transferring device and punching device

Abstract

The invention discloses a lead frame transfer device and a punching device, and belongs to the technical field of semiconductor lead frame carrying, the transfer device comprises a lifting plate, the bottom of the lifting plate is provided with a pair of side plates, the side plates are provided with mounting holes, and first positioning rods are slidably arranged in the lifting plate; the transfer assemblies are arranged at the two ends of the side plates correspondingly and comprise top plates and supporting rods penetrating through the corresponding side plates; sliding rods penetrating through the side plates are connected to the outer side end surfaces of the top plates; the material receiving plate is arranged below the lifting plate and is movably arranged in the length direction of the side plate; blanking holes are formed in the material receiving plates, and second positioning rods are arranged on the material receiving plates on the two sides of the material receiving plates; the guiding parts are arranged at the ends of the two sides of the material receiving plate correspondingly. The punching device comprises a transfer device, a conveying mechanism and a punching mechanism. The transfer device can effectively improve the transfer efficiency of the lead frame, and the punching device can effectively improve the punching efficiency of the lead frame.

Description

Technical Field

[0001] This application belongs to the field of semiconductor leadframe handling technology, and particularly relates to a leadframe transfer device and a punching device. Background Technology

[0002] There are two processes for forming the lead frame after molding: strip punching and single-piece punching. Strip punching allows for continuous automatic feeding and high-speed punching, making it the preferred choice for large-scale production. However, in actual production, mainstream packages are formed using strip punching, while single-piece punching is mainly used for small batches, multiple varieties, and R&D samples. This is because the expensive precision progressive lead forming dies of strip punching equipment and the long die debugging time when changing to different products require sufficiently large batch sizes to be economical.

[0003] The main drawback of the current monolithic punching process is its low production efficiency, primarily due to the lead frame transfer process during punching. When punching a monolithic lead frame, the lead frame must first be placed on the lower die of the punching equipment, and then the upper die is pressed down to cut the metal connecting ribs and edge strips between pins and units, completely separating each package unit and ejecting the material. However, the waste frame formed during punching remains on the lower die and must be removed before the next lead frame can be placed. The punching process suffers from low automation and low lead frame transfer efficiency. This invention aims to improve the lead frame transfer efficiency to overcome the low production efficiency of the monolithic punching process. Summary of the Invention

[0004] To address the shortcomings of the prior art, this application provides a lead frame transfer device and a punching device, which can effectively improve the transfer efficiency and punching process efficiency of the lead frame.

[0005] To achieve the above objectives, the present invention employs the following techniques: A lead frame transfer device, comprising: The lifting plate has a pair of parallel side plates vertically arranged at the bottom. The side plates have vertical mounting holes, and a first positioning rod in a vertical position is slidably arranged in the mounting holes. The transfer assembly is located at both ends of the side plate. It includes a top plate parallel to the side plate and a support rod perpendicularly passing through the corresponding side plate. A sliding rod passing through the corresponding side plate is perpendicularly connected to the outer end face of the top plate. The upper end of the top plate is located below the support rod, and its lower end is located below the bottom surface of the side plate. The receiving plate is arranged parallel to the lower part of the lifting plate and moves along the length of the side plate; the receiving plate has a material dropping hole, and the receiving plates on both sides are vertically provided with a second positioning rod that matches the first positioning rod; The guide section is located at both ends of the receiving plate and includes a first section, a second section, a third section, and a fourth section. The first section is inclined towards the middle of the receiving plate. The second section is vertically arranged, with its upper end connected to the lower end of the first section. The third section is horizontally arranged, with one end connected to the lower end of the second section. The two ends of the fourth section are respectively connected to the upper end of the first section and the other end of the third section. The angle formed by the fourth section and the second section is an acute angle. When the lifting platform descends to the first height, the inner end faces of the top plate and the support rod extend beyond the inner end faces of the corresponding side plates under the action of the first stage, and the inner end face of the first positioning rod extends beyond the inner end face of the corresponding side plate and aligns with the corresponding second positioning rod; when the lifting platform descends to the second height, the bottom surface of the first positioning rod abuts against the top surface of the second positioning rod, and the top plate and the support rod retract under the action of the third stage until their inner end faces do not exceed the inner end faces of the corresponding side plates.

[0006] A lead frame punching device, comprising: The above-mentioned lead frame transfer device; A conveying mechanism for transverse and horizontal conveying of a lead frame, wherein the lead frame transfer device is located at the end of the conveying mechanism, and a support rod is used to support the lead frame output from the end of the conveying mechanism. The punching mechanism is spaced at the end of the lead frame transfer device and is used to punch the lead frame sent by the receiving plate, and the receiving plate sends the punched waste frame back to the bottom of the lifting plate.

[0007] The beneficial effects of this invention are as follows: 1. The transfer device, through the setting of support rod, mounting base and first positioning rod, can realize stable support and effective positioning of lead frame during the feeding and transfer stages, which is conducive to improving the stability of lead frame during transfer; 2. The slide bar and support bar are set to extend or retract synchronously. Through the cooperation between the top plate and the rectangular hole, and the support bar and the side of the corresponding strip block, the waste frame on the receiving plate can be pushed out by the top plate before the lead frame falls onto the receiving plate. This realizes the synchronous operation of the transfer stage and the waste discharge stage, and effectively improves the overall transfer efficiency of the lead frame. 3. By setting up the connecting rod, push rod, crossbar, first spring, and second spring, and coordinating the contact between the connecting rod and the column, and the movement of the connecting rod along the L-shaped groove, the downward stroke of the two blocks can be automatically converted into the synchronous relative approach or back-to-back separation of the support rod and the sliding rod, thereby realizing the transfer of the lead frame and the discharge of the waste frame, effectively improving the automation level of the transfer device, and helping to further improve the overall transfer efficiency of the lead frame. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the main structure of the transfer device according to an embodiment of this application.

[0009] Figure 2 This is a schematic diagram of the structure of the top surface of the workbench in an embodiment of this application.

[0010] Figure 3 This is a schematic diagram of the receiving plate in an embodiment of this application.

[0011] Figure 4 yes Figure 3 A magnified view of part A in the middle.

[0012] Figure 5 This is a schematic diagram of the lifting plate structure in an embodiment of this application.

[0013] Figure 6 This is a side view of the side panel of an embodiment of this application.

[0014] Figure 7 This is a schematic diagram of the mounting base according to an embodiment of this application.

[0015] Figure 8 yes Figure 7 A magnified view of part B in the middle.

[0016] Figure 9 This is a diagram showing the positional relationship between the connecting rod and the guide plate when the lifting plate is at the first height according to an embodiment of this application.

[0017] Figure 10 This is a front view of the lifting plate when it is at the first height according to an embodiment of this application.

[0018] Figure 11 This is a diagram showing the positional relationship between the side plate and the receiving plate when the mating rod abuts against the upper part of one end of the horizontal section of the L-shaped groove in an embodiment of this application.

[0019] Figure 12 This is a front view of the lifting plate when the mating rod abuts against the upper part of one end of the horizontal section of the L-shaped groove in an embodiment of this application.

[0020] Figure 13 This is a diagram showing the positional relationship between the connecting rod and the guide plate when the lifting plate is at the second height according to an embodiment of this application.

[0021] Figure 14 This is a schematic diagram of the lead frame structure.

[0022] Reference numerals: 1-Lifting plate, 11-Side plate, 111-Baffle, 112-Motor, 12-Mounting hole, 13-First positioning rod, 14-First receiving groove, 15-Mounting base, 16-Support plate, 17-Third spring, 18-Strip groove, 19-Connecting rod, 2-Transfer assembly, 21-Top plate, 22-Support rod, 23-Slide rod, 24-Matching rod, 25-First spring, 26-Push rod, 27-Crossbar, 28-Second spring, 3-Receiving plate, 31-Discharge hole, 32-Second positioning... 33-Second receiving groove, 4-Guide part, 41-First section, 42-Second section, 43-Third section, 44-Fourth section, 45-Guide plate, 5-Bidirectional lead screw, 6-Conveying mechanism, 61-Conveyor belt, 7-Leader frame, 71-Positioning groove, 8-Punching mechanism, 81-Lower die base, 82-Discharge hole, 83-Upper die, 9-Workbench, 91-Gantry frame, 92-First linear mechanism, 93-First guide rod, 94-Second guide rod, 95-Second linear mechanism, 96-Third linear mechanism. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the implementation methods of the present invention will be described in detail below with reference to the accompanying drawings. However, the embodiments described in this invention are only some embodiments of the present invention, and not all embodiments.

[0024] Example 1 This application provides a lead frame transfer device for feeding the lead frame 7 into a punching process for punching and for removing waste from the scrap frame. The structure of the lead frame 7 is as follows: Figure 14 As shown, the molding compound is arranged in an array along the length of the lead frame 7 and forms multiple rows. The package wraps the chip, bonding wires, and inner pins of the lead frame. Connecting ribs connect each molding unit and the metal ribs that fix the pins. Two arc-shaped positioning grooves 71 are opened on both sides of the lead frame 7.

[0025] The lead frame transfer device includes: a lifting plate 1, a transfer component 2, a receiving plate 3, a guide part 4, etc.

[0026] Among them, such as Figures 3-6 As shown, the lifting plate 1 is horizontally set and moves vertically. A pair of parallel side plates 11 are vertically set at its bottom. The distance between the two side plates 11 is equal to the width of the lead frame 7. Two mounting holes 12 are vertically opened on each side plate 11, and the two mounting holes 12 on the two side plates 11 are arranged opposite each other. A mounting seat 15 is slidably set in each mounting hole 12. The mounting seat 15 is strip-shaped and vertically arranged. A vertical first positioning rod 13 is slidably fitted on the inner side of the mounting seat 15 along the vertical direction. Its inner end face is arc-shaped.

[0027] like Figure 3and Figure 4 As shown, the transfer assembly 2 is respectively disposed at both ends of the side plate 11, and includes a top plate 21 disposed parallel to the side plate 11 and a support rod 22 perpendicularly passing through the corresponding side plate 11; the outer end face of the top plate 21 is vertically connected to a sliding rod 23 passing through the corresponding side plate 11; two support rods 22 on one side plate 11 are located between two corresponding sliding rods 23, and the axes of each support rod 22 are located at the same horizontal level; the upper end of the top plate 21 is located below the support rod 22, and its lower end is located below the bottom surface of the side plate 11.

[0028] like Figure 3 As shown, the receiving plate 3 is arranged parallel to the lower part of the lifting plate 1 and moves along the length of the side plate 11; the receiving plate 3 has a rectangular dropping hole 31, which is arranged along the length of the side plate 11; two second positioning rods 32 are vertically arranged along the length of the side plate 11 on both sides of the receiving plate 3 of the dropping hole 31, and the inner end face of the second positioning rod 32 is arc-shaped. The first positioning rod 13 is used to cooperate with the corresponding second positioning rod 32.

[0029] like Figure 3 As shown, guide sections 4 are respectively located at both ends of the receiving plate 3, and are used to move along their own axis with the lifting guide slide 23 and support rod 22 of the lifting plate 1. The guide section 4 includes a first section 41, a second section 42, a third section 43, and a fourth section 44. The first section 41 is inclined towards the middle of the receiving plate 3. The second section 42 is vertically arranged, and its upper end is connected to the lower end of the first section 41. The third section 43 is horizontally arranged, and one end is connected to the lower end of the second section 42. The two ends of the fourth section 44 are respectively connected to the upper end of the first section 41 and the other end of the third section 43. The angle formed by the fourth section 44 and the second section 42 is an acute angle.

[0030] like Figure 1 and Figure 2 As shown, the lifting plate 1 is mounted on a horizontally arranged strip-shaped workbench 9. The length direction of the side plate 11 is consistent with the length direction of the workbench 9, and the receiving plate 3 slides along the length direction of the side plate 11 on the surface of the workbench 9.

[0031] The following will explain the specific transfer principle of the lead frame 7 based on the above structure: Material feeding stage: such as Figure 3 and Figure 4 As shown, the receiving plate 3 moves to directly below the lifting plate 1, at which point the inner end faces of the top plate 21 and the support rod 22 do not extend beyond the inner end faces of the corresponding side plates 11. Figure 4 , Figure 9 , Figure 10As shown, the lifting plate 1 descends vertically to the first height. Under the guidance of the first section 41, the inner end faces of the top plate 21 and the support rod 22 extend out of the inner end faces of the corresponding side plates 11. At this time, the lead frame 7 can be conveyed between the two side plates 11 by the automatic conveying mechanism, and the support rod 22 supports both sides of the lead frame 7. The projection of the top plate 21 downward in the vertical direction is located in the drop hole 31. At the same time, since the conveying speed is constant, the conveyed lead frame 7 will stop at the predetermined position between the two side plates 11, and the positioning grooves 71 on both sides of the lead frame 7 will not be in contact with the corresponding first height. The positioning rod 13 deviates significantly from the length of the side plate 11. The mounting seats 15 on both side plates 11 move closer together in a direction perpendicular to the side plates 11, causing the inner end face of the first positioning rod 13 to extend a predetermined distance from the corresponding side plate 11. The inner end face of the first positioning rod 13 abuts against the edge of the corresponding positioning groove 71 and enters the positioning groove 71 along its edge, thus achieving the adjustment and positioning of the lead frame 7. The downward projection of the extended first positioning rod 13 in the vertical direction coincides with the top surface of the corresponding second positioning rod 32, completing the loading stage. It should be noted that the inner end face of the first positioning rod 13 only abuts against the concave arc surface of the positioning groove 71 and does not generate clamping force.

[0032] Transfer phase: such as Figures 11-13 As shown, the lifting plate 1 continues to descend, and the support rod 22 and slide rod 23 remain extended under the guidance of the second section 42. The lead frame 7 moves down synchronously with the lifting plate 1 under the support of the support rod 22. When the bottom surface of the first positioning rod 13 abuts against the top surface of the corresponding second positioning rod 32, and the arc surface of the first positioning rod 13 abuts against the arc surface of the second positioning rod 32, the lifting plate 1 continues to descend to the second height. The first positioning rod 13 slides vertically upward relative to the lifting plate 1 on the mounting base 15. The first positioning rod 13 and the second positioning rod 32 always remain in contact. The lower end of the side plate 11 abuts against the top surface of the receiving plate 3. The support rod 22 and slide rod 23 are in the third section 42. Guided by segment 43, the lead frame 7 retracts until its inner end face does not exceed the inner end face of the corresponding side plate 11. At this time, since the lead frame 7 is no longer supported by the support rod 22, it will fall onto the receiving plate 3 along the first positioning rod 13 and the second positioning rod 32. The inner end face of the second positioning rod 32 is located in the corresponding positioning groove 71, thus completing the transfer of the lead frame 7. Then, the lifting plate 1 moves up and returns to the mating position with the first segment 41 under the guidance of the fourth segment 44. The receiving plate 3 carries the lead frame 7 and moves to the punching device for punching. The remaining scrap frame returns to the bottom of the lifting plate 1 with the receiving plate 3 for waste discharge and awaits the transfer of the next lead frame 7.

[0033] Waste Discharge Phase: The entire waste discharge phase is carried out simultaneously with the transfer phase, such as... Figures 9-13As shown, the scrap frame formed by the punching of the previous lead frame 7 returns to the underside of the lifting plate 1 along with the receiving plate 3. The lifting plate 1 descends to the first height, and the next lead frame 7 is conveyed between the two side plates 11. Since the lower end of the top plate 21 is located below the bottom surface of the side plate 11, during the period when the lifting plate 1 descends from the first height to the second height, the lower end of the top plate 21 will abut against the edge of the scrap frame from the top surface of the receiving plate 3 and enter the dropping hole 31, thereby causing the two sides of the scrap frame to bend and disengage from the second positioning rod 32 until its lower end pushes the scrap frame out. After the lifting plate 1 descends to the second height, the top plate 21 and the support rod 22 retract until their inner end faces do not exceed the inner end faces of the corresponding side plate 11. The next lead frame 7 takes over the position of the scrap frame and falls on the receiving plate 3, thereby completing the waste discharge synchronously during the transfer stage.

[0034] The material transfer device, through the support rod 22, mounting base 15, and first positioning rod 13, can stably support and effectively position the lead frame 7 during the feeding and transfer stages, which is beneficial to improving the stability of the lead frame 7 during the transfer process. At the same time, through the setting of sliding rod 23, support rod 22, and guide part 4, and through the cooperation between top plate 21 and dropping hole 31, and support rod 22 and corresponding side plate 11, the top plate 21 can push out the waste frame on the receiving plate 3 before the lead frame 7 falls onto the receiving plate 3, thereby realizing the synchronous operation of the transfer stage and the waste discharge stage, effectively improving the overall transfer efficiency of the lead frame 7.

[0035] In addition, the cooperation between the first positioning rod 13 and the second positioning rod 32 allows the lead frame 7 to fall along the curved surface where the first positioning rod 13 and the second positioning rod 32 meet, ensuring that the lead frame 7 can accurately dock with the second positioning rod 32 after falling, which can effectively improve the reliability of the transfer device.

[0036] When the receiving plate 3 carries the lead frame 7 to the punching device, the lifting plate 1 moves upward at the same time to prepare for the feeding of the lead frame 7. When the receiving plate 3 carries the scrap frame left after punching back to the bottom of the lifting plate 1, the feeding of the next lead frame 7 is also completed simultaneously. That is, when the receiving plate 3 carries the scrap frame back to the bottom of the lifting plate 1, the waste discharge and transfer can be carried out directly and simultaneously, which further improves the transfer efficiency of the lead frame 7.

[0037] Specifically, such as Figure 3 and Figure 4As shown, a second receiving groove 33 is provided at both ends of the material discharge hole 31. When the lifting plate 1 descends to the second height, the four top plates 21 can respectively enter the corresponding second receiving groove 33, so that the inner end face of the top plate 21 does not exceed the inner end face of the corresponding side plate 11. By setting the second receiving groove 33, when the lifting plate 1 rises from the second height, the top plate 21 will not push up the lead frame 7 that is falling on the receiving plate 3, thus preventing the transfer from failing and further improving the reliability of the transfer device.

[0038] Preferred, such as Figure 1 and Figure 5 As shown, one end of each side plate 11 is provided with a baffle 111 arranged perpendicular to the side plate 11. During feeding, the automatic conveying mechanism conveys the lead frame 7 to one end of the lead frame 7 to abut against the baffle 111. After the lead frame 7 abuts against the baffle 111, the positioning grooves 71 on both sides of the lead frame 7 are roughly aligned with the corresponding first positioning rods 13, so that the first positioning rods 13 can position the lead frame 7.

[0039] Preferred, such as Figure 1 and Figure 2 As shown, a portal frame 91 is mounted on the workbench 9 along its length. The lifting plate 1 is located inside the portal frame 91. A first linear mechanism 92 is provided on the top of the portal frame 91. Its movable end passes vertically through the top of the portal frame 91 and is connected to the top surface of the lifting plate 1. The first linear mechanism 92 can be in the form of a linear cylinder, hydraulic cylinder, etc. The top surface of the lifting plate 1 is connected to a first guide rod 93 that passes vertically through the top of the portal frame 91. A pair of second guide rods 94 are mounted on the workbench 9 along its length. The two sides of the receiving plate 3 slide through the second guide rods 94 respectively. A second linear mechanism 95 is provided on the workbench 9. Its movable end faces the length of the workbench 9 and is connected to the receiving plate 3. The second linear mechanism 95 can be in the form of a linear cylinder, hydraulic cylinder, etc.

[0040] Preferred, such as Figure 2 As shown, a positioning structure can be provided on the second guide rod 94 so that the receiving plate 3 can be accurately positioned directly below the lifting plate 1.

[0041] Example 2 As a further implementation of the above embodiment 1, such as Figures 3-9As shown, to guide the support rod 22 and slide rod 23 through the guide part 4 during the movement of the lifting plate 1, mating rods 24 are provided at the ends of the slide rods 23 located on the outer side of the side plate 11, arranged along the length of the side plate 11 and facing away from each other. The mating rods 24 are round rods. The guide part 4 includes guide plates 45 respectively perpendicularly provided at the ends of the receiving plate 3, with their sides facing the length of the side plate 11 and their top surfaces inclined towards the middle of the receiving plate 3. L-shaped grooves are provided on the opposite sides of the two guide plates 45 located on the same side of the receiving plate 3. One end of the horizontal section is connected to the end of the guide plate 45 facing the middle of the receiving plate 3, and one end of the vertical section of the L-shaped groove is connected to the top surface of the guide plate 45. The angle formed by the vertical section of the L-shaped groove and the end of the guide plate 45 facing the middle of the receiving plate 3 is an acute angle. The top surface of the guide plate 45, the end of the guide plate 45 facing the middle of the receiving plate 3, the horizontal section and the vertical section of the L-shaped groove are used to form the first section 41, the second section 42, the third section 43 and the fourth section 44 respectively. The mating rod 24 is used to abut against the first section 41 and the second section 42, and is used to be inserted into the third section 43 and the fourth section 44.

[0042] like Figure 3 and Figure 4 As shown, both ends of the side plate 11 are provided with first receiving grooves 14 for accommodating the top plate 21 when the inner end face of the top plate 21 does not exceed the inner end face of the corresponding side plate 11; a first spring 25 is sleeved on the slide rod 23, which connects the top plate 21 and the bottom surface of the corresponding first receiving groove 14; the ends of the slide rods 23 located on the outer side of the side plate 11 are vertically connected to push rods 26; the ends of the support rods 22 located on the outer side of the side plate 11 are connected by a crossbar 27 arranged in the length direction of the side plate 11, and the crossbar 27 is located between the corresponding side plate 11 and the... Between push rods 26; a second spring 28 is sleeved on support rod 22, which is connected between the outer side of side plate 11 and cross bar 27; when the first spring 25 and the second spring 28 are in their natural state, the inner end faces of top plate 21 and support rod 22 do not exceed the inner end faces of the corresponding side plate 11, cross bar 27 abuts against push rod 26, the horizontal distance between mating rod 24 and the end of corresponding guide plate 45 facing the middle of receiving plate 3 is equal to the length of third segment 43, and the vertical downward projection of mating rod 24 is located on the top surface of corresponding guide plate 45.

[0043] When applying, such as Figure 3 , Figure 4 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 As shown, the receiving plate 3 is located directly below the lifting plate 1. The length of one end of the mating rod 24 extending into the opposite side of the corresponding guide plate 45 is less than the depth of the L-shaped groove. The first spring 25 and the second spring 28 are both in their natural state. The inner end faces of the top plate 21 and the support rod 22 do not exceed the inner end face of the corresponding side plate 11. As the lifting plate 1 moves downward, the cooperating rod 24 abuts against the top inclined surface of the corresponding guide plate 45, and moves downward along the inclined surface of the corresponding guide plate 45, causing the sliding rods 23 on both side plates 11 to move closer together synchronously. This causes the inner end face of the top plate 21 to extend beyond the inner end face of the corresponding side plate 11, and the projection of the top plate 21 downward in the vertical direction is located within the material drop hole 31. Simultaneously, the push rod 26 resists the elasticity of the second spring 28 to push the corresponding crossbar 27, causing the support rods 22 on both side plates 11 to move closer together synchronously, with the inner end face of the support rod 22 extending beyond the inner end face of the corresponding side plate 11. Figure 9 and Figure 10 As shown, when the mating rod 24 leaves the top inclined surface of the guide plate 45 and abuts against the top of the guide plate 45 at one end facing the middle of the receiving plate 3, the lifting plate 1 descends to the first height, and the support rod 22 supports the conveyed lead frame 7.

[0044] like Figures 11-13 As shown, when the connecting rod 24 abuts against the end of the guide plate 45 facing the middle of the receiving plate 3 and continues to move down with the lifting plate 1, since the end of the guide plate 45 facing the middle of the receiving plate 3 is a vertical surface, the top plate 21 and the support rod 22 always remain in an extended state.

[0045] like Figures 11-13 As shown, when the mating rod 24 abuts against the upper part of one end of the L-shaped groove, the top plate 21 pushes out the waste frame, and the bottom of the first positioning rod 13 abuts against the top of the second positioning rod 32; when the mating rod 24 continues to move down to one end of the L-shaped groove, that is, when the lifting plate 1 descends to the second height, the mating rod 24 will enter the L-shaped groove under the action of the first spring 25 and abut against the end of the L-shaped groove, that is, the connection with the vertical part of the L-shaped groove. At this time, the first spring 25 returns to its natural state, the top plate 21 retracts into the corresponding second receiving groove 33, and the inner end face of the top plate 21 does not exceed the inner end face of the corresponding side plate 11. The second spring 28 also returns to its natural state with the movement of the push rod 26, and the support rod 22 retracts. The lead frame 7 is lowered so that its inner end face does not exceed the inner end face of the corresponding side plate 11. After the lead frame 7 is lowered, the lifting plate 1 moves upward, driving the mating rod 24 to move along the vertical part of the L-shaped groove. The first spring 25 contracts, the sliding rods 23 on the two side plates 11 separate in opposite directions, and the top plate 21 further retracts into the corresponding second receiving groove 33, so that the top plate 21 further separates from the two sides of the lead frame 7 during the process of rising with the lifting plate 1, further ensuring that the top plate 21 will not lift the lead frame 7. After the mating rod 24 moves out along the vertical part of the L-shaped groove, the first spring 25 extends to the natural state, and the vertical downward projection of the mating rod 24 falls back onto the top inclined surface of the corresponding guide plate 45, ready for the next loading and transfer.

[0046] By configuring the connecting rod 24, push rod 26, crossbar 27, first spring 25, and second spring 28, and by coordinating the contact between the connecting rod 24 and the guide plate 45, and the movement of the connecting rod 24 along the L-shaped groove, the downward stroke of the lifting plate 1 can be automatically converted into the synchronous relative approach or back-to-back separation of the support rod 22 and the sliding rod 23, thereby realizing the transfer of the lead frame 7 and the discharge of the waste frame, effectively improving the automation level of the transfer device and further improving the overall material transfer efficiency of the lead frame 7; at the same time, the support rods 22 on the two side plates 11 can retract synchronously, that is, when the lead frame 7 is released, the supporting force on both sides disappears at the same time, and the force is consistent. Moreover, the lengths of the first positioning rod 13 and the second positioning rod 32 are relatively short, which can effectively ensure the stable descent of the lead frame 7 and further improve the reliability of the material transfer device.

[0047] Specifically, such as Figure 5 , Figure 7 , Figure 8 As shown, the top of the mounting base 15 is provided with a support plate 16 protruding towards the first positioning rod 13. The bottom surface of the support plate 16 and the top surface of the first positioning rod 13 are connected by a vertically arranged third spring 17. The inner sides of the two side plates 11 are provided with strip grooves 18 that communicate with the corresponding mounting holes 12. The grooves are provided with connecting rods 19 that face the length direction of the side plates 11 and are connected to the corresponding mounting base 15. A bidirectional lead screw 5 is mounted between the two side plates 11 and is set perpendicular to the side plates 11. The two ends of the bidirectional lead screw 5 are rotatably engaged with the inner sides of the two side plates 11. The middle parts of the two connecting rods 19 are respectively threaded into the two opposite threads of the bidirectional lead screw 5. A motor 112 is provided on the outer side of one of the side plates 11 to drive the bidirectional lead screw 5 to rotate. When the second positioning rod 32 moves upward against the first positioning rod 13, the top surface of the second positioning rod 32 can be tightly attached to the bottom surface of the first positioning rod 13 due to the action of the third spring 17, ensuring that the second positioning rod 32 and the inclined surface of the first positioning rod 13 are stably connected, further ensuring the stability of the falling lead frame 7.

[0048] Example 3 This application also provides a lead frame punching device, such as Figure 1 and Figure 2 As shown, it includes: a lead frame transfer device, a conveying mechanism 6, and a punching mechanism 8 as described in Embodiment 1 or 2.

[0049] Among them, such as Figure 1 and Figure 2 As shown, the conveying mechanism 6 includes a conveyor belt 61 that is horizontally mounted on the workbench 9 in the same direction, for conveying the lead frame 7 laterally and horizontally. The lead frame transfer device is located at the end of the conveyor belt 61 in the conveying direction. When the lifting plate 1 descends to the first height, the conveyor belt 61 sends a lead frame 7 between the two side plates 11 and is supported by the support rod 22.

[0050] Preferably, in order to ensure that the conveyor belt 61 can deliver accurately, a corresponding guide structure can be provided on the conveyor belt 61 to guide the movement of the lead frame 7.

[0051] like Figure 1 and Figure 2 As shown, the punching mechanism 8 is spaced at the end of the lead frame transfer device, including a lower die base 81 on the worktable 9, which is rectangular and arranged along the length of the worktable 9. The lower die base 81 has a discharge hole 82. An upper die 83 is mounted above the lower die base 81 and is moved vertically. The dropping hole 31 is connected to the end of the receiving plate 3 facing the lower die base 81. The receiving plate 3 can move toward the punching mechanism 8, so that the lower die base 81 enters the dropping hole 31 from the end of the receiving plate 3, thereby moving the lead frame 7 horizontally onto the lower die base 81. Then the upper die 83 moves down to punch the lead frame 7. The punched semiconductor package falls out through the discharge hole 82, and the remaining waste frame is sent to the lower part of the lifting plate 1 by the receiving plate 3.

[0052] Specifically, as shown in the figure, the portal frame 91 is also equipped with a third linear mechanism 96, which is used to drive the upper mold 83 to move in the vertical direction. The third linear mechanism 96 can be in the form of a linear cylinder, hydraulic cylinder, etc.

[0053] The aforementioned lead frame transfer device has a high lead frame 7 transfer efficiency, which can effectively improve the punching efficiency of the lead frame punching device.

[0054] The above description is only a preferred embodiment of this application and is not intended to limit this application. Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application.

Claims

1. A lead frame transfer device, characterized in that, include: The lifting plate (1) has a pair of parallel side plates (11) vertically arranged at the bottom. The side plates (11) have vertically opened mounting holes (12), and a first positioning rod (13) in a vertical state is slidably arranged in the mounting holes (12). The transfer assembly (2) is respectively located at both ends of the side plate (11), and includes a top plate (21) parallel to the side plate (11) and a support rod (22) that passes vertically through the corresponding side plate (11); the outer end face of the top plate (21) is vertically connected to a sliding rod (23) that passes through the corresponding side plate (11); the upper end of the top plate (21) is located below the support rod (22), and its lower end is located below the bottom surface of the side plate (11); The receiving plate (3) is arranged parallel to the lower part of the lifting plate (1) and moves along the length of the side plate (11); the receiving plate (3) has a dropping hole (31), and the receiving plates (3) on both sides are provided with a second positioning rod (32) that matches the first positioning rod (13). The guide section (4) is located at both ends of the receiving plate (3), including a first section (41), a second section (42), a third section (43), and a fourth section (44); wherein the first section (41) is inclined toward the middle of the receiving plate (3); the second section (42) is vertically arranged, and its upper end is connected to the lower end of the first section (41); the third section (43) is horizontally arranged, and one end of its end is connected to the lower end of the second section (42); the two ends of the fourth section (44) are respectively connected to the upper end of the first section (41) and the other end of the third section (43), and the angle formed by the fourth section (44) and the second section (42) is an acute angle; When the lifting plate (1) descends to the first height, the inner end faces of the top plate (21) and the support rod (22) extend out of the inner end face of the corresponding side plate (11) under the action of the first section (41), and the inner end face of the first positioning rod (13) extends out of the inner end face of the corresponding side plate (11) and aligns with the corresponding second positioning rod (32); when the lifting plate (1) descends to the second height, the bottom surface of the first positioning rod (13) abuts against the top surface of the second positioning rod (32), and the top plate (21) and the support rod (22) retract under the action of the third section (43) until their inner end faces do not exceed the inner end face of the corresponding side plate (11).

2. The lead frame transfer device according to claim 1, characterized in that, The sliding rods (23) located on the outer side of the side plate (11) are provided with mating rods (24) arranged along the length of the side plate (11) and facing away from each other; the guide part (4) includes guide plates (45) respectively perpendicularly provided at the ends of the receiving plate (3), with their sides facing the length of the side plate (11) and their top surfaces inclined towards the middle of the receiving plate (3); the two guide plates (45) located on the same side of the receiving plate (3) are provided with L-shaped grooves on their opposite sides, with one end of their horizontal parts connected to the guide plates. (45) One end of the L-shaped groove facing the middle of the receiving plate (3) is connected to the top surface of the guide plate (45); wherein, the top surface of the guide plate (45), the end of the guide plate (45) facing the middle of the receiving plate (3), the horizontal part and the vertical part of the L-shaped groove are respectively used to form the first section (41), the second section (42), the third section (43) and the fourth section (44), and the mating rod (24) is used to fit into the top surface of the corresponding guide plate (45), the end facing the middle of the receiving plate (3) and the L-shaped groove.

3. The lead frame transfer device according to claim 2, characterized in that, Both ends of the side plate (11) are provided with a first receiving groove (14) for receiving the top plate (21) when the inner end face of the top plate (21) does not exceed the inner end face of the corresponding side plate (11).

4. The lead frame transfer device according to claim 3, characterized in that, A first spring (25) is fitted on the slide rod (23), which is connected between the top plate (21) and the bottom surface of the corresponding first receiving groove (14); the ends of the slide rods (23) located on the outside of the side plate (11) are all vertically connected to push rods (26); the ends of the support rods (22) located on the outside of the side plate (11) are connected by a crossbar (27) arranged in the length direction of the side plate (11), and the crossbar (27) is located between the corresponding side plate (11) and the push rod (26); the support rods (22) A second spring (28) is fitted on the top plate (21) and connected between the side plate (11) and the crossbar (27). When the first spring (25) and the second spring (28) are in their natural state, the inner end faces of the top plate (21) and the support rod (22) are located in the corresponding side plate (11), the crossbar (27) and the push rod (26) abut against each other, and the horizontal distance between the mating rod (24) and the end of the corresponding guide plate (45) facing the middle of the receiving plate (3) is equal to the length of the third segment (43).

5. A lead frame transfer device according to claim 1, characterized in that, The material discharge hole (31) is rectangular and arranged along the length of the side plate (11). A second receiving groove (33) is provided at both ends of the material discharge hole (31).

6. The lead frame transfer device according to claim 1, characterized in that, Mounting seats (15) are slidably provided in the mounting holes (12). The first positioning rod (13) is slidably fitted on the inner side of the corresponding mounting seat (15) in the vertical direction. The top of the mounting seat (15) is provided with a support plate (16) protruding towards the corresponding first positioning rod (13). The bottom surface of the support plate (16) and the top surface of the corresponding first positioning rod (13) are connected by a vertically arranged third spring (17).

7. A lead frame transfer device according to claim 6, characterized in that, The inner sides of the two side plates (11) are provided with strip grooves (18) that connect to the corresponding mounting holes (12), and there are connecting rods (19) in the grooves that are oriented toward the length of the side plate (11) and connected to the corresponding mounting base (15); a two-way screw rod (5) is provided between the two side plates (11), which is set perpendicular to the side plate (11), and the two connecting rods (19) are respectively threaded into the two opposite ends of the two-way screw rod (5), and the two-way screw rod (5) is set to rotate around its own axis.

8. A lead frame punching device, characterized in that, include: A lead frame transfer device as described in any one of claims 1 to 7; A conveying mechanism (6) is used to convey the lead frame (7) laterally and horizontally. The lead frame transfer device is located at the end of the conveying mechanism (6), and a support rod (22) is used to support the lead frame (7) output from the end of the conveying mechanism (6). The punching mechanism (8) is spaced at the end of the lead frame transfer device and is used to punch the lead frame (7) sent by the receiving plate (3), and the receiving plate (3) sends the punched waste frame back to the bottom of the lifting plate (1).

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