Lead frame feeding device and control method

Abstract

The present invention discloses a lead frame loading device and control method, which relate to the field of semiconductor device packaging technology. It is used to solve the problems of large loss during lead frame picking due to soft material of existing lead frames, long product packaging time and high production cost. The lead frame loading device includes: a hopper, which pushes the lead frame arranged on the first guide rail to the frame fixing seat through a pushing plate; a frame grabbing part, which is arranged on one side of the hopper, and moves the lead frame arranged on the frame fixing seat to the top of the frame feeding table through a grabbing rotating shaft; a frame feeding table, which is arranged on the side of the frame grabbing part away from the hopper, and pushes the lead frame located above the frame feeding table to a set position through a pushing paddle.

Description

Technical Field

[0001] The present invention relates to the technical field of semiconductor device packaging, and more specifically to a lead frame feeding device and a control method. Background Art

[0002] Lead frame is the basic material in the core-on process during semiconductor packaging. In practical applications, the wafer is divided into individual chips through the dicing process. In the core-on process, each individual chip is fixed on each carrier of the lead frame by adhesive materials such as soft solder or conductive glue. In the pressure welding process, the lead pins of the chip and the carrier are connected with conductive materials such as gold, silver, copper, and aluminum to form a circuit that meets the design requirements. After plastic encapsulation, curing, tinning, rib cutting, testing and other processes, it becomes a qualified semiconductor component.

[0003] Among lead frames, the fully encapsulated lead frame is soft and easy to deform and difficult to separate. The existing loading rack is prone to frame falling, deformation, and picking up multiple frames during the frame picking process. These problems will cause equipment jamming, abnormal increase in product quality, more frame loss, and increased staff adjustment time. These factors seriously affect the output and quality of fully encapsulated products, resulting in longer product packaging time, increased staff work intensity, reduced production efficiency and material utilization, and increased product packaging costs.

[0004] In summary, the existing lead frame is relatively soft in material, resulting in large loss during lead frame picking, long product packaging time and high production cost. Summary of the invention

[0005] The embodiment of the present invention provides a lead frame feeding device and a control method, which are used to solve the problems that the lead frame is soft in material, resulting in large loss during lead frame picking, long product packaging time and high production cost.

[0006] An embodiment of the present invention provides a lead frame feeding device, comprising:

[0007] A material bin, which pushes the lead frame arranged on the first guide rail to the frame fixing seat through a pushing plate;

[0008] The frame grabbing part is arranged on one side of the silo and moves the lead frame arranged on the frame fixing seat to above the frame feeding table through the grabbing rotating shaft;

[0009] The frame feeding station is arranged on a side of the frame grabbing part away from the material bin, and pushes the lead frame located above the frame feeding station to a set position by pushing a paddle.

[0010] Preferably, the silo further comprises a second guide rail, a first screw rod, a first screw rod bracket and a first stepper motor;

[0011] A pair of second guide rails are arranged on the surface of the silo and are located between the pair of first guide rails, and the frame fixing seats include a plurality of seats which are arranged at intervals at one end of the second guide rails;

[0012] The first screw rod is arranged below the surface of the silo, and its front end is connected to the first stepper motor through a belt; the first screw rod bracket is arranged on the first screw rod, and the first screw rod bracket is connected to the pushing plate; the first stepper motor drives the first screw rod to rotate through the belt, and the first screw rod drives the first screw rod bracket and the pushing plate to slide on the second guide rail, and pushes the lead frame arranged on the first guide rail to slide along the first guide rail to the frame fixing seat.

[0013] Preferably, the silo further includes a first sensor and a first induction baffle;

[0014] The first sensor is on the front end of the first screw rod, the first sensing baffle is arranged on the first screw rod bracket, and the first sensor is used to determine the distance between the first sensor and the first sensing baffle.

[0015] Preferably, the silo further comprises a first cylinder and a first solenoid valve;

[0016] The first cylinder is located under the frame fixing seat, and the lower end of each frame fixing is arranged on the first cylinder;

[0017] The first solenoid valve is electrically connected to the first cylinder and is used to provide power to the first cylinder so that the frame fixing seat arranged on the first cylinder moves in the vertical direction.

[0018] Preferably, the frame grabbing portion further comprises a rotating bracket, a second cylinder and a second stepping motor;

[0019] The rotating bracket includes a cylinder fixing block and fixing ends located on both sides of the cylinder fixing block, and the two fixing ends are parallel to each other;

[0020] The grabbing rotating shaft is a rectangular parallelepiped, and a grabbing rod is arranged on its side;

[0021] The two ends of the grabbing rotating shaft are respectively arranged on the fixed end, and the grabbing rotating shaft rotates around the axis of the grabbing rotating shaft under the action of the second stepping motor;

[0022] The rotating bracket is arranged on the second cylinder through a cylinder fixing block, and can move in a vertical direction under the action of the second cylinder.

[0023] Preferably, the frame grabbing part further comprises a positioning bracket and a grabbing head;

[0024] The grabbing head is arranged on the grabbing rod, a plurality of the grabbing rods are arranged on the side of the grabbing rotating shaft, and a positioning bracket is arranged above each of the grabbing rods, and the positioning bracket is used to stabilize the lead frame clamped by the grabbing head.

[0025] Preferably, the frame grabbing portion further comprises a base bracket, a second screw rod, a second screw rod bracket and a third stepping motor;

[0026] The second cylinder is arranged on the upper surface of the base support;

[0027] The front end of the second screw rod is connected to the third stepping motor via a belt, the second screw rod bracket is arranged on the second screw rod, and the second screw rod bracket is connected to the base bracket;

[0028] The second stepper motor drives the second screw rod to rotate through a belt, and the second screw rod drives the second screw rod bracket and the base bracket to move toward the frame fixing seat.

[0029] Preferably, the frame grabbing portion further includes a second sensing baffle, a third sensing baffle, a second sensor, and a third sensor;

[0030] The second inductive baffle is arranged on the rotating shaft of the second stepping motor, and the second sensor is used to determine the angle between the second sensor and the second inductive baffle;

[0031] The third sensing baffle is arranged on the base support, and the third sensor is used to determine the distance between the third sensor and the third sensing baffle.

[0032] Preferably, the frame feed station further comprises: a fifth sensor, a belt fixer, and a fourth stepping motor;

[0033] One end of the push paddle is connected to a belt holder, the belt holder is arranged on a belt, and the belt is connected to a fourth stepping motor;

[0034] Under the action of the fourth stepper motor, the belt drives the belt fixer and the pushing paddle to move toward the frame feeding platform, and pushes the lead frame to a set position.

[0035] The embodiment of the present invention also provides a lead frame feeding device control method, comprising:

[0036] After receiving the adding instruction, a start instruction is sent to the first stepper motor, so that the first stepper motor drives the push plate and the lead frame arranged on the first guide rail to move toward the frame fixing seat;

[0037] After determining that the lead frame is fixed to the frame fixing seat, sending a start command to the second cylinder and the third stepper motor so that the grabbing rotating shaft moves in the direction of the frame fixing seat and has the same height as the lead frame;

[0038] Sending a start signal to the third solenoid valve so that the third solenoid valve controls a gripping head disposed on the gripping rotating shaft to grip the lead frame; when it is determined that the gripping rotating shaft is located on the frame feeding table, controlling the gripping head to place the lead frame on the frame feeding table;

[0039] A start instruction is sent to the fourth stepper motor, so that the fourth stepper motor drives a pushing paddle disposed on the belt to push the lead frame to a set position.

[0040] The embodiment of the present invention provides a lead frame loading device and control method, the lead frame loading device comprises: a hopper, which pushes the lead frame set on the first guide rail to the frame fixing seat through a push plate; a frame grabbing part, which is set on one side of the hopper, and moves the lead frame set on the frame fixing seat to the top of the frame feeding table through a grabbing rotating shaft; a frame feeding table, which is set on the side of the frame grabbing part away from the hopper, and pushes the lead frame located above the frame feeding table to a set position through a pushing paddle. In the device, the lead frame is set on the guide rail on the hopper, and the lead frame is pushed to the frame fixing seat through a push plate, thereby avoiding the problem of deformation of the lead frame during movement due to the soft material; furthermore, the lead frame set on the frame fixing seat is clamped and moved through the grabbing rotating shaft of the frame grabbing part, thereby avoiding the problem of the lead frame falling during movement; the pushing paddle on the frame feeding table pushes the clamped lead frame to the set position, thereby completing the movement of the lead frame. The device provided by the embodiment of the present invention solves the problems of large loss during lead frame picking due to soft material of the existing lead frame, long product packaging time and high production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A schematic structural diagram of a lead frame feeding device provided in an embodiment of the present invention;

[0043] Figure 2 A schematic diagram of a silo structure provided in an embodiment of the present invention;

[0044] Figure 3 A schematic diagram of the structure of the frame grabbing part provided by an embodiment of the present invention;

[0045] Figure 4 A schematic diagram of the structure of a frame feed table provided in an embodiment of the present invention;

[0046] Figure 5 A schematic flow chart of a lead frame feeding control method provided by an embodiment of the present invention;

[0047] Among them, 100 ~ material bin; 200 ~ frame grabbing part; 300 ~ frame feeding platform; 1 ~ pushing plate; 2 ~ first guide rail; 3 ~ first sensor; 4 ~ second guide rail; 5 ~ first screw rod; 6 ~ first sensor; 7 ~ first stepper motor; 8 ~ frame fixing seat; 9 ~ first cylinder; 10 ~ grabbing rod; 11 ~ positioning bracket; 12 ~ air inlet; 13 ~ second stepper motor; 14 ~ second sensor, 15 ~ rotating bracket; 16 ~ second cylinder; 17 ~ base bracket; 18 ~ second screw rod; 19 ~ third sensor; 20 ~ third stepper motor; 21 ~ fifth sensor; 22 ~ sixth sensor; 23 ~ pushing paddle; 24 ~ belt fixer; 25 ~ fourth sensor; 26 ~ fourth stepper motor; 27 ~ grabbing rotating axis. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Figure 1 A schematic structural diagram of a lead frame feeding device provided in an embodiment of the present invention; Figure 2 A schematic diagram of a silo structure provided in an embodiment of the present invention; Figure 3 A schematic diagram of the structure of the frame grabbing part provided by an embodiment of the present invention; Figure 4 A schematic diagram of the structure of the frame feed table provided in an embodiment of the present invention; Figure 1 to Figure 4 , a lead frame loading device provided in an embodiment of the present invention is introduced in detail.

[0050] like Figure 1 As shown, the lead frame loading device mainly includes a material bin 100, a frame grabbing portion 200 and a frame feeding platform 300. The material bin 100 is used to push the lead frame arranged on the first guide rail 2 onto the frame fixing seat 8 through the pushing plate 1.

[0051] It should be noted that if Figure 2As shown, the hopper 100 is provided with a driving device electrically connected to the PLC controller. Through the cooperation of the PLC controller and the electrically connected driving device, the lead frame can be pushed onto the frame fixing seat 8 through the pushing plate 1.

[0052] Furthermore, if Figure 3 As shown, the frame grabbing part 200 is arranged on one side of the silo 100, and can clamp the lead frame arranged on the frame fixing seat 8 through the grabbing rotating shaft 27, and move the lead frame from the frame fixing seat 8 to the top of the frame feeding platform 300. Among them, the frame feeding platform 300 and the silo 100 are respectively arranged on both sides of the frame grabbing part 200, that is, the lead frame can be moved from the silo 100 to the frame feeding platform 300 through the frame grabbing part 200.

[0053] It should be noted that the frame grabbing part 200 is provided with a driving device electrically connected to the PLC controller. Through the cooperation of the PLC controller and the electrically connected driving device, a series of actions such as the movement of the grabbing rotating shaft 27, the clamping of the lead frame and the movement of the lead frame can be completed until the lead frame is moved to the frame feeding table 300.

[0054] Furthermore, if Figure 4 As shown, the frame feeding platform 300 is provided with a pushing paddle 23 . By controlling the pushing paddle 23 , the lead frame disposed on the frame feeding platform 300 can be pushed to a set position through the pushing paddle 23 .

[0055] It should be noted that a driving device electrically connected to the PLC controller is provided on the frame feed table 300. By using the PLC controller and the electrically connected driving device in coordination, the push paddle 23 can be moved on the frame feed table 300. At the same time, the lead frame set on the frame feed table 300 can be pushed to the set position.

[0056] The embodiment of the present invention provides a lead frame loading device, which sets the lead frame on the guide rail on the hopper, and pushes the lead frame to the frame fixing seat through the push plate, thereby avoiding the problem of deformation of the lead frame during movement due to the soft material; furthermore, the lead frame set on the frame fixing seat is clamped and moved through the grabbing rotating shaft of the frame grabbing part, thereby avoiding the problem of the lead frame falling during movement; the pushing paddle on the frame feeding table pushes the clamped lead frame to the set position, thereby completing the movement of the lead frame. The device provided by the embodiment of the present invention solves the problem that the existing lead frame has a large loss during the lead frame picking process due to the soft material, and causes a long product packaging time and high production cost.

[0057] For example, Figure 2As shown, the silo 100 provided in the embodiment of the present invention further includes a second guide rail 4, a first screw rod 5 and a first stepper motor 7. Specifically, a pair of second guide rails 4 are symmetrically arranged on the upper surface of the silo 100, and the pair of second guide rails 4 are located between a pair of first guide rails 2. Among them, the first guide rails 2 are distributed on both sides of the upper surface of the silo 100, which are used to set the lead frame, and the second guide rails 4 are used to set the push plate 1. It should be noted that, because the upper surface of the silo 100 is used to set the first guide rails 2 and the second guide rails 4, in order to prevent the lead frame set on the first guide rails 2 and the push plate 1 set on the second guide rails 4 from sliding off from both sides of the upper surface of the silo 100, preferably, bosses are arranged on both sides of the upper surface of the silo 100, and the bosses on both sides can prevent the lead frame and the push plate 1 from sliding off from the upper surface of the silo 100 due to the tilt of the silo 100.

[0058] Furthermore, the number of the frame fixing seats 8 includes a plurality, which are arranged at intervals at one end of the second guide rail 4 , and the frame fixing seats 8 are used to set the lead frame pushed by the push plate 1 .

[0059] Furthermore, in order to control the movement of the push plate 1 on the second guide rail 4, preferably, the first screw rod 5 is arranged below the upper surface of the silo 100, and its front end is connected to the first stepper motor 7 through a belt; the first screw rod bracket is arranged on the first screw rod 5, and the first screw rod bracket is mechanically connected to the push plate 1. It should be noted that the front end of the first screw rod 5 here refers to the end of the first screw rod 5 away from the frame fixing seat 8.

[0060] In the embodiment of the present invention, the first stepper motor 7 drives the first screw 5 to rotate through the belt, wherein the first screw 5 can rotate forward or reverse. Specifically, when the first stepper motor 7 drives the first screw 5 to rotate forward through the belt, the first screw 5 drives the first screw support and the push plate 1 to slide on the second guide rail 4, and pushes the lead frame disposed on the first guide rail 2 to slide along the first guide rail 2 toward the frame fixing seat 8; when the first stepper motor 7 drives the first screw 5 to reverse through the belt, the first screw 5 drives the first screw support and the push plate 1 to slide on the second guide rail 4 away from the frame fixing seat 8.

[0061] It should be noted that when the first stepper motor 7 drives the first screw rod 5 to rotate forward through the belt, the push plate 1 is used to push the lead frame toward the frame fixing seat 8, with the purpose of setting the lead frame on the frame fixing seat 8; and when the first stepper motor 7 drives the first screw rod 5 to rotate reversely through the belt, the push plate 1 slides along the second guide rail 4 away from the frame fixing seat 8, with the purpose of setting the lead frame on the first guide rail 2.

[0062] For example, the silo 100 provided in the embodiment of the present invention further includes a first sensor 6 and a first inductive baffle. Specifically, the first sensor 6 is arranged at the front end of the first screw 5 and fixed on the front end, and the first inductive baffle is arranged on the first screw bracket. When the first stepper motor 7 drives the first screw 5 to rotate forward through the belt, the first screw 5 drives the first screw bracket and the push plate 1 to slide on the second guide rail 4, and pushes the lead frame arranged on the first guide rail 2 to slide along the first guide rail 2 toward the frame fixing seat 8. At this time, the distance between the first sensor 6 and the first inductive baffle is relatively large, and the first sensor 6 does not need to determine the distance between the first sensor 6 and the first inductive baffle; when the first stepper motor 7 drives the first screw 5 to reverse through the belt, the first screw 5 drives the first screw bracket and the push plate 1 to slide on the second guide rail 4 away from the frame fixing seat 8. At this time, the distance between the first sensor 6 and the first inductive baffle will become closer and closer as the first screw 5 reverses, and when the first sensor 6 senses the first inductive baffle, it can determine the distance between the first sensor 6 and the first inductive baffle.

[0063] For example, the silo 100 provided in the embodiment of the present invention further includes a first cylinder 9 and a first solenoid valve. Specifically, the first cylinder 9 is located under the frame fixing seat 8, and the lower end of each frame fixing is arranged on the first cylinder 9. Further, the first solenoid valve is electrically connected to the first cylinder 9, and the first solenoid valve is used to provide power to the first cylinder 9 so that the frame fixing seat 8 arranged on the first cylinder 9 moves in the vertical direction. It should be noted that when the first cylinder 9 moves in the vertical direction, the frame fixing seat 8 will also move upward. When the frame fixing seat 8 is lifted upward, it can fix the lead frame arranged on the frame fixing seat 8.

[0064] For example, Figure 3 As shown, the frame grabbing part 200 provided by the embodiment of the present invention also includes a rotating bracket 15, a second cylinder 16 and a second stepping motor 13. Specifically, the rotating bracket 15 includes a cylinder fixing block and fixed ends of a grabbing rotating shaft 27 located on both sides of the cylinder fixing block, and the two fixed ends of the grabbing rotating shaft 27 are parallel to each other; further, the grabbing rotating shaft 27 is a rectangular parallelepiped, and a grabbing rod 10 is arranged on one side thereof, and the two ends of the grabbing rotating shaft 27 are respectively arranged on the fixed ends of the grabbing rotating shaft 27, and the grabbing rotating shaft 27 can rotate around the axis of the grabbing rotating shaft 27 under the action of the second stepping motor 13. When the grabbing rotating shaft 27 rotates around the axis of the grabbing rotating shaft 27, the position of the rod head of the grabbing rod 10 arranged on the side of the grabbing rotating shaft 27 will change in space.

[0065] Furthermore, the rotating bracket 15 is arranged on the second cylinder 16 through the cylinder fixing block, and the other end of the second cylinder 16 is arranged on the base bracket 17. When the second cylinder 16 moves in the vertical direction, it can drive the rotating bracket 15 and the grabbing rotating shaft 27 arranged on the second cylinder 16 to move in the vertical direction at the same time.

[0066] Furthermore, the frame grasping part 200 also includes a positioning bracket 11 and a grasping head; specifically, the grasping head is arranged on the grasping rod 10, and multiple grasping rods 10 are arranged on a side of the grasping rotating shaft 27, and a positioning bracket 11 is arranged above each grasping rod 10. Through the positioning bracket 11, the lead frame grasped by the grasping head can be stabilized.

[0067] Further, the frame grabbing part 200 also includes a second screw rod 18, a second screw rod bracket and a third stepping motor 20. Specifically, the front end of the second screw rod 18 is connected to the third stepping motor 20 through a belt, the second screw rod bracket is arranged on the second screw rod 18, and the second screw rod bracket is mechanically connected to the base bracket 17. It should be noted that the front end of the second screw rod 10 here refers to the end of the second screw rod 18 close to the frame fixing seat 8.

[0068] In the embodiment of the present invention, the third stepper motor 20 drives the second screw rod 18 to rotate through the belt, wherein the second screw rod 18 can rotate forward or reverse. Specifically, when the third stepper motor 20 drives the second screw rod 18 to reverse through the belt, the second screw rod 18 drives the second screw rod bracket and the base bracket 17 to move toward the frame fixing seat 8; when the third stepper motor 20 drives the second screw rod 18 to rotate forward through the belt, the second screw rod 18 drives the second screw rod bracket and the base bracket 17 to move away from the frame fixing seat 8.

[0069] It should be noted that, in actual applications, by controlling the third stepper motor 20 and the second cylinder 16, the rotating bracket 15 and the grabbing rotating axis 27 arranged on the base bracket 17 can be adjacent to the frame fixing seat 8 and also have the same height; further, by controlling the second stepper motor 13, the grabbing head can clamp and move the lead frame, thereby realizing the movement of the lead frame.

[0070] For example, Figure 3As shown, the frame grabbing part 200 provided by the embodiment of the present invention further includes a second sensing baffle, a third sensing baffle, a second sensor 14, and a third sensor 19; specifically, the second sensing baffle is arranged at the left end of the rotating shaft of the second stepper motor 13, and the second sensor 14 is used to determine the angle between it and the second sensing baffle, so that the PLC controller controls the rotation angle of the second stepper motor 13 according to the angle between the two; the third sensing baffle is arranged on the base bracket 17, and the third sensor 19 is used to determine the distance between it and the third sensing baffle.

[0071] For example, Figure 4 As shown, the frame feed station 300 provided in the embodiment of the present invention further includes a fifth sensor 21, a belt fixer 24, and a fourth stepper motor 26; specifically, one end of the push paddle 23 is connected to the belt fixer 24, the belt fixer 24 is arranged on the belt, and the belt is connected to the fourth stepper motor 26; under the action of the fourth stepper motor 26, the belt drives the belt fixer 24 and the push paddle 23 to move toward the direction of the frame feed station 300, and pushes the lead frame to the set position.

[0072] Furthermore, the frame feed table 300 also includes a fifth sensor 21 and a sixth sensor 22, wherein the fifth sensor 21 is arranged below the frame feed table 300 and located in the middle position of the frame feed table 300, and is used to determine whether a lead frame is set on the frame feed table 300; the sixth sensor 22 is arranged below the right end of the frame feed table 300, and is used to determine whether the lead frame set on the frame feed table 300 is transmitted out of the frame feed table 300, thereby issuing an instruction to start the next cycle.

[0073] It should be noted that the above embodiment also includes a PLC controller, which is electrically connected to the first sensor 6, the first stepper motor 7, and the first solenoid valve arranged on the silo 100; electrically connected to the second stepper motor 13, the second sensor 14, the third sensor 19, the third stepper motor 20, and the second solenoid valve arranged on the frame grasping part 200; and electrically connected to the fourth sensor 25, the fifth sensor 21, the sixth sensor 22 and the fourth stepper motor 26 arranged on the frame feeding table 300.

[0074] In order to introduce the lead frame feeding device according to the embodiment of the present invention in more detail, Figure 5 Combined with Figure 1 to Figure 4 Taking the lead frame feeding device as an example, a control method is described in detail. Specifically, the control method mainly includes the following steps:

[0075] Step 101, after receiving the adding instruction, sending a start instruction to the first stepper motor, so that the first stepper motor drives the push plate and the lead frame arranged on the first guide rail to move toward the frame fixing seat;

[0076] Step 102, after determining that the lead frame is fixed to the frame fixing seat, sending a start instruction to the second cylinder and the third stepper motor to move the grabbing rotating axis toward the frame fixing seat and to have the same height as the lead frame;

[0077] Step 103, sending a start signal to the third solenoid valve so that the third solenoid valve controls a gripping head disposed on the gripping rotating shaft to grip the lead frame; when it is determined that the gripping rotating shaft is located on the frame feeding table, controlling the gripping head to place the lead frame on the frame feeding table;

[0078] Step 104 , sending a start instruction to the fourth stepper motor, so that the fourth stepper motor drives a pushing paddle disposed on the belt to push the lead frame to a set position.

[0079] It should be noted that, in the embodiment of the present invention, the execution body is a PLC controller, one end of which is electrically connected to the electronic components included in the lead frame feeding device, and the other end is connected to the control PC end.

[0080] In step 101, after the control PC sends a signal to add a lead frame to the PLC controller, the PLC controller receives the instruction to add a lead frame, and sends a start signal to the first stepper motor 7. After the first stepper motor 7 is turned on, the first stepper motor 7 drives the first screw rod 5 to reverse through the belt, that is, the first screw rod 5 drives the first screw rod bracket and the push plate 1 to slide on the second guide rail 4 away from the frame fixing seat 8.

[0081] In practical applications, since the first sensor 6 is arranged at the front end of the first screw 5 and the first sensing baffle is arranged on the first screw bracket, when the first screw 5 is reversed, the first screw 5 drives the first screw bracket and the push plate 1 to slide on the second guide rail 4 away from the frame fixing seat 8. Because the distance between the first sensor 6 and the first sensing baffle is getting closer and closer, when the first sensor 6 senses the first sensing baffle, it can be determined that the push plate 1 slides to the specified position on the second guide rail. In the embodiment of the present invention, the distance between the first sensor 6 and the first sensing baffle and the distance between the push plate 1 and the specified position of the second guide rail 4 are made into a corresponding ratio, that is, according to the distance information between the first sensor 6 and the first sensing baffle, the distance between the push plate 1 and the specified position on the second guide rail 4 can be determined.

[0082] In an embodiment of the present invention, when the first sensor 6 senses the signal of the first sensing baffle, it feeds back the first sensing information to the PLC controller. The PLC controller receives the first sensing signal and sends a shutdown signal to the first stepper motor 7 to stop the first stepper motor 7 from working; further, the operator removes the push plate 1, sets the lead frame on the first guide rail 2, and then installs the push plate 1 back on the first screw bracket.

[0083] Further, the PLC controller receives the instruction to pick up the lead frame, and sends an opening instruction to the first stepper motor 7. After the first stepper motor 7 receives the opening instruction, the first stepper motor 7 drives the first screw rod 5 to slide toward the frame fixing seat 8 through the belt. At the same time, since the lead frame has been set on the first guide rail 2, when the first screw rod 5 drives the push plate 1 to slide toward the frame fixing seat 8, the lead frame can be driven to slide on the first guide rail 2 toward the frame fixing seat 8. The push plate 1 pushes the lead frame to slide on the first guide rail 2, avoiding the problem of deformation of the lead frame during movement due to the soft material.

[0084] In the embodiment of the present invention, after the first sensor 3 senses the lead frame, the first sensor 3 feeds back a signal to the PLC controller, and the PLC controller controls the first stepper motor 7 to stop working. In the embodiment of the present invention, the first sensor 3 is arranged at the front end of the first guide rail 2, and the lead frame moves forward under the push of the push plate 1. After the first sensor 3 senses the lead frame, the first sensor 3 feeds back a signal to the PLC controller, and the PLC controller controls the first stepper motor 7 to stop moving.

[0085] Furthermore, after the PLC controller receives the signal fed back by the first sensor 3, it sends an opening signal to the first solenoid valve. After the first solenoid valve is opened, it controls the first cylinder 9 to push the frame fixing seat 8 to move upward in the vertical direction. When the frame fixing seat 8 moves upward, the lead frame set on the frame fixing seat 8 can be fixed, thereby preventing the lead frame from falling during the movement.

[0086] In step 102, after the lead frame is fixed to the frame fixing seat 8, the PLC controller sends an opening signal to the second solenoid valve. After the second solenoid valve is opened, the second cylinder 16 is controlled to move in the vertical direction, which can drive the rotating bracket 15 and the grabbing rotating shaft 27 disposed on the second cylinder 16 to move in the vertical direction at the same time. After the second cylinder 16 lifts up the rotating bracket 15, the PLC controller sends an opening signal to the second stepping motor 13. After the second stepping motor 13 is turned on, the grabbing rotating shaft 27 can rotate around the axis direction of the grabbing rotating shaft 27 under the action of the second stepping motor 13 until the grabbing rod head disposed on the side of the grabbing rotating shaft 27 faces the frame fixing seat 8.

[0087] In actual application, when the second sensor 14 senses the second sensing baffle, a feedback signal is sent to the PLC controller, and the PLC controller controls the second stepper motor 13 to stop. In the embodiment of the present invention, the second sensor 14 and the second sensing baffle are both arranged at the left end of the second stepper motor 13, wherein the second sensing baffle is arranged at the left end of the rotating shaft of the second stepper motor, and the second sensor 14 senses the angle of the second sensing baffle, thereby feeding back a signal to the PLC controller, and the PLC controller controls the rotation angle of the second stepper motor 13 according to the feedback signal of the second sensor 14.

[0088] Furthermore, the PLC controller sends a start signal to the third stepper motor 20, and the third stepper motor 20 drives the second screw 18 to reverse through the belt, and the second screw 18 drives the second screw bracket, the base bracket 17, the second cylinder 16 and the rotating bracket 15 to move toward the frame fixing seat 8.

[0089] In actual application, after the third sensor 19 senses the third sensing baffle, it feeds back a signal to the PLC controller, and the PLC controller controls the third stepper motor 20 to stop working. In an embodiment of the present invention, the third sensor 19 is arranged at the front end of the second screw 18 and is fixed on the front end, and the third sensing baffle is arranged on the second screw support. When the third stepper motor 20 drives the second screw 18 to reverse through the belt, the second screw 18 drives the second screw support and the base support 17 to move toward the direction of the frame fixing seat 8. At this time, the distance between the third sensor 19 and the third sensing baffle will become closer and closer as the second screw 18 reverses. When the third sensor 19 senses the third sensing baffle, it can determine the distance between it and the third sensing baffle. After the third sensor 19 senses the third sensing baffle, it feeds back a signal to the PLC controller, and the PLC controller controls the third stepper motor 20 to stop working according to the received signal.

[0090] Through the control of the PLC controller, the grabbing rotating shaft 27 can be moved toward the frame fixing seat 8 and have the same height as the lead frame.

[0091] In step 103, the PLC controller sends an opening signal to the third solenoid valve. After the third solenoid valve is opened, the grabbing head is controlled to open and clamp the lead frame. When the grabbing head clamps the lead frame, the positioning bracket 11 arranged above the grabbing rod 10 can stabilize the lead frame to prevent the lead frame from being deformed and falling during the clamping process.

[0092] It should be noted that the frame grabbing part 200 provided in the embodiment of the present invention is also provided with an air inlet 12 on the rotating bracket 15, and the outlet of the air inlet 12 is connected to the grabbing rod 10. When the third solenoid valve is turned on, compressed air enters the rotating shaft through the air inlet 12, thereby controlling the grabbing head on the grabbing rod 10 on the grabbing rotating shaft 27 to clamp the lead frame.

[0093] Furthermore, the PLC controller sends a start signal to the third stepper motor 20, and the third stepper motor 20 drives the second screw rod to drive the base bracket 17 mechanically connected to the second screw rod, and the second cylinder 16 arranged on the base bracket 17, and the rotating bracket 15 moves away from the frame fixing seat 8.

[0094] The PLC controller sends an opening signal to the second stepper motor 13. After the second stepper motor 13 is turned on, the gripping head for gripping the lead frame rotates from the direction toward the frame fixing seat 8 to the direction toward the frame feeding table 300 when the gripping rotating shaft 27 rotates around the axis of the gripping rotating shaft 27. Further, the PLC controller sends an opening signal to the third solenoid valve. After the third solenoid valve is turned on, the gripping head is controlled to open and the lead frame is placed on the frame feeding table 300.

[0095] It should be noted that after the lead frame is placed on the frame feeding table 300, the PLC controller will further control the third stepper motor 20 so that the third stepper motor 20 drives the grabbing rotating shaft 27 to run to the default position, waiting for the next lead frame to be clamped.

[0096] In step 104, after the fifth sensor 21 on the frame feed table 300 senses that the lead frame is set on the frame feed table 300, it feeds back a signal to the PLC controller, and the PLC controller sends a start signal to the fourth stepper motor 26. After the fourth stepper motor 26 works, it drives the belt fixture 24 set on the belt. The push paddle 23 set on the belt fixture 24 can push the lead frame set on the frame feed table 300 to the set position. Further, when the push paddle 23 pushes the lead frame to the set position. In the embodiment of the present invention, the fourth sensing baffle is set on the belt fixture 24. When the fourth stepper motor 26 works and drives the belt fixture 24 set on the belt to move backward, the fourth sensor 25 senses the fourth sensing baffle set on the belt fixture 24, and the fourth sensor 25 feeds back a signal to the PLC controller, and the PLC controller controls the fourth stepper motor 26 to stop.

[0097] In summary, the embodiment of the present invention provides a lead frame loading device and control method, the lead frame loading device includes: a hopper, which pushes the lead frame set on the first guide rail to the frame fixing seat through a push plate; a frame grabbing part, which is set on one side of the hopper, and moves the lead frame set on the frame fixing seat to the top of the frame feeding table through a grabbing rotating shaft; a frame feeding table, which is set on the side of the frame grabbing part away from the hopper, and pushes the lead frame located above the frame feeding table to a set position through a pushing paddle. In the device, the lead frame is set on the guide rail on the hopper, and the lead frame is pushed to the frame fixing seat through a push plate, thereby avoiding the problem of deformation of the lead frame during movement due to the soft material; furthermore, the lead frame set on the frame fixing seat is clamped and moved through the grabbing rotating shaft of the frame grabbing part, thereby avoiding the problem of the lead frame falling during movement; the pushing paddle on the frame feeding table pushes the clamped lead frame to the set position, thereby completing the movement of the lead frame. The device provided by the embodiment of the present invention solves the problems of large loss during lead frame picking due to soft material of the existing lead frame, long product packaging time and high production cost.

[0098] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0099] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A lead frame feeding device, characterized in that: include: A material bin, the material bin comprising a push plate, a first guide rail, and a frame fixing seat, the first guide rails are distributed on both sides of the upper surface of the material bin, the first guide rails are used to set the lead frame, a plurality of the frame fixing seats are set at one end of the first guide rail, each frame fixing lower end is connected to a first cylinder, the first cylinder is electrically connected to a first solenoid valve, and the push plate is used to push the lead frame set on the first guide rail to the frame fixing seat; The frame grabbing part is arranged on one side of the silo, and the frame grabbing part comprises a rotating bracket, a second cylinder, a third stepping motor and a grabbing rotating shaft, wherein the grabbing rotating shaft is arranged on the rotating bracket, and the rotating bracket is connected to the second cylinder, and the third stepping motor and the second cylinder are controlled so that the rotating bracket, the grabbing rotating shaft and the frame fixing seat are adjacent to each other and have the same height. The frame feeding platform is arranged on a side of the frame grabbing part away from the material bin, and the frame feeding platform comprises a pushing paddle, through which the lead frame located above the frame feeding platform is pushed to a set position.

2. The lead frame feeding device according to claim 1, characterized in that: The silo also includes a second guide rail, a first screw rod, a first screw rod bracket and a first stepper motor; A pair of second guide rails are arranged on the surface of the silo and are located between the pair of first guide rails, and the frame fixing seats include a plurality of seats which are arranged at intervals at one end of the second guide rails; The first screw rod is arranged below the surface of the silo, and its front end is connected to the first stepper motor through a belt; the first screw rod bracket is arranged on the first screw rod, and the first screw rod bracket is connected to the pushing plate; the first stepper motor drives the first screw rod to rotate through the belt, and the first screw rod drives the first screw rod bracket and the pushing plate to slide on the second guide rail, and pushes the lead frame arranged on the first guide rail to slide along the first guide rail to the frame fixing seat.

3. The lead frame feeding device according to claim 2, characterized in that: The silo also includes a first sensor and a first induction baffle; The first sensor is on the front end of the first screw rod, the first sensing baffle is arranged on the first screw rod bracket, and the first sensor is used to determine the distance between the first sensor and the first sensing baffle.

4. The lead frame feeding device according to claim 1, characterized in that: The frame grabbing portion also includes a second stepping motor; The rotating bracket includes a cylinder fixing block and fixing ends located on both sides of the cylinder fixing block, and the two fixing ends are parallel to each other; The grabbing rotating shaft is a rectangular parallelepiped, and a grabbing rod is arranged on its side; The two ends of the grabbing rotating shaft are respectively arranged on the fixed end, and the grabbing rotating shaft rotates around the axis of the grabbing rotating shaft under the action of the second stepping motor; The rotating bracket is arranged on the second cylinder through a cylinder fixing block, and can move in a vertical direction under the action of the second cylinder.

5. The lead frame feeding device according to claim 4, characterized in that: The frame grabbing part also includes a positioning bracket and a grabbing head; The grabbing head is arranged on the grabbing rod, a plurality of the grabbing rods are arranged on the side of the grabbing rotating shaft, and a positioning bracket is arranged above each of the grabbing rods, and the positioning bracket is used to stabilize the lead frame clamped by the grabbing head.

6. The lead frame feeding device according to claim 4, characterized in that: The frame grabbing part also includes a base bracket, a second screw rod, and a second screw rod bracket; The second cylinder is arranged on the upper surface of the base support; The front end of the second screw rod is connected to the third stepping motor via a belt, the second screw rod bracket is arranged on the second screw rod, and the second screw rod bracket is connected to the base bracket; The second stepper motor drives the second screw rod to rotate through a belt, and the second screw rod drives the second screw rod bracket and the base bracket to move toward the frame fixing seat.

7. The lead frame feeding device according to claim 6, characterized in that: The frame grabbing part further includes a second sensing baffle, a third sensing baffle, a second sensor, and a third sensor; The second inductive baffle is arranged on the rotating shaft of the second stepping motor, and the second sensor is used to determine the angle between the second sensor and the second inductive baffle; The third sensing baffle is arranged on the base support, and the third sensor is used to determine the distance between the third sensor and the third sensing baffle.

8. The lead frame feeding device according to claim 1, characterized in that: The frame feed station also includes: a fifth sensor, a belt fixer, and a fourth stepper motor; One end of the push paddle is connected to a belt holder, the belt holder is arranged on a belt, and the belt is connected to a fourth stepping motor; Under the action of the fourth stepper motor, the belt drives the belt fixer and the pushing paddle to move toward the frame feeding platform, and pushes the lead frame to a set position.

9. A method for controlling a lead frame loading device, using the lead frame loading device according to claim 8, characterized in that: include: After receiving the adding instruction, a start instruction is sent to the first stepper motor, so that the first stepper motor drives the push plate and the lead frame arranged on the first guide rail to move toward the frame fixing seat; After determining that the lead frame is fixed to the frame fixing seat, sending a start command to the second cylinder and the third stepper motor so that the grabbing rotating shaft moves in the direction of the frame fixing seat and has the same height as the lead frame; Sending a start signal to the third solenoid valve so that the third solenoid valve controls a gripping head disposed on the gripping rotating shaft to grip the lead frame; when it is determined that the gripping rotating shaft is located on the frame feeding table, controlling the gripping head to place the lead frame on the frame feeding table; A start instruction is sent to the fourth stepper motor, so that the fourth stepper motor drives a pushing paddle disposed on the belt to push the lead frame to a set position.

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