Lead frame in-position detection device

Abstract

The invention discloses a lead frame in-position detection device, comprising a base body and a detection unit connected to the base body, wherein the detection unit is used to detect whether the lead frame is completely in-position in a mold. The lead frame in-position detection device can realize automatic detection and improve work efficiency.

Description

Technical Field

[0001] The invention relates to a detection device, in particular to a lead frame in-position detection device. Background Art

[0002] Currently, there is no in-position detection function for lead frames on manual plastic encapsulation presses. The operating status of the equipment is observed by the operator with the naked eye. The existing technology requires the operator to track the operating status of the plastic encapsulation press throughout the entire process. The human observation range is limited and the internal situation of the equipment cannot be seen. This will increase the scrap rate, and manual operation has low production efficiency and high cost. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a lead frame in-position detection device.

[0004] It can realize automatic detection and improve work efficiency.

[0005] To solve the above technical problems, the embodiments of the present invention adopt the following technical solutions:

[0006] A lead frame in-position detection device comprises a base body and a detection unit connected to the base body, wherein the detection unit is used to detect whether the lead frame is completely in position in a mold.

[0007] As a preferred example, the number of the detection units is four or eight.

[0008] As a preferred example, the detection unit includes a pressure plate and at least two detection components; the pressure plate is located below the substrate, the detection component includes a connecting sub-component and a detection sub-component, the connecting sub-component is used to connect the pressure plate and the substrate, and the pressure plate is movable; the detection sub-component is used to detect whether the lead frame is in place.

[0009] As a preferred example, the connecting subassembly includes a connecting body and a first elastic body; a first through hole is provided at a position opposite to the pressure plate and the connecting body; the top end of the connecting body passes through the base, and the top of the connecting body overlaps with the top surface of the base; the bottom end of the connecting body is located in the first through hole of the pressure plate, and the bottom of the connecting body overlaps with the pressure plate; the first elastic body is sleeved on the connecting body, and one end of the first elastic body is against the top surface of the pressure plate, and the other end of the first elastic body is against the base.

[0010] As a preferred example, the bottom of the connector is overlapped with the pressure plate, including: a limiter is provided at the bottom of the connector, the limiter is matched with the boss in the first through hole, and the limiter is located below the boss.

[0011] As a preferred example, the top of the connector overlaps with the top surface of the base, including: the bottom edge of the top of the connector fits with the top surface of the base.

[0012] As a preferred example, the detection subassembly includes a detection body, a second elastic body, and a detector; a second through hole is provided at a position of the pressure plate relative to the detection body; the detector and the base are fixedly connected, the bottom end of the detection body is located in the second through hole of the pressure plate, and the bottom of the detection body and the pressure plate overlap; the top end of the detection body passes through the base, the second elastic body is mounted on the detection body, and one end of the second elastic body is against the detection body, and the other end is against the base.

[0013] As a preferred example, the bottom end of the detection body is flush with the bottom of the second through hole of the pressing plate.

[0014] As a preferred example, the bottom of the detection body overlaps with the pressing plate, including: the bottom end of the detection body located outside the second through hole is in contact with the top surface of the pressing plate.

[0015] Compared with the prior art, the lead frame in-position detection device of the embodiment of the present invention can realize automatic detection and improve work efficiency. The detection device of this embodiment detects whether the position of the lead frame in the mold meets the operation requirements. When the position of the lead frame in the mold does not meet the operation requirements, an alarm signal is sent. When the position of the lead frame in the mold meets the operation requirements, no alarm signal is sent. Through the detection device of this embodiment, automatic detection is realized without the need for manual visual inspection. This embodiment saves manpower and improves the yield rate. The product quality is stable and controllable, and the detection efficiency is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0017] Figure 2 It is a structural cross-sectional view of the detection component in an embodiment of the present invention.

[0018] The figure includes: base 1, detection unit 2, pressure plate 21, first through hole 211, second through hole 212, detection component 22, connecting subcomponent 221, connecting body 2211, first elastic body 2212, limiter 2213, detection subcomponent 222, detection body 2221, second elastic body 2222, detector 2223. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings.

[0020] like Figure 1 As shown, a lead frame in-position detection device according to an embodiment of the present invention comprises a base 1 and a detection unit 2 connected to the base 1. The detection unit 2 is used to detect whether the lead frame is completely in position in the mold. Preferably, the detection units 2 are four or eight.

[0021] After the lead frame is placed in the mold, the detection device of this embodiment is used to detect whether the position of the lead frame in the mold meets the operation requirements. When the position of the lead frame in the mold does not meet the operation requirements, an alarm signal is sent. When the position of the lead frame in the mold meets the operation requirements, no alarm signal is sent. The detection device of this embodiment realizes automatic detection without manual visual detection. This embodiment also improves the detection efficiency.

[0022] Preferably, the detection unit 2 includes a pressing plate 21 and at least two detection components 22, the pressing plate 21 is located below the substrate 1, and the detection component 22 includes a connecting subcomponent 221 and a detection subcomponent 222. The connecting subcomponent 221 is used to connect the pressing plate 21 and the substrate 1, and the pressing plate 21 is movable. The detection subcomponent 222 is used to detect whether the lead frame is in place.

[0023] The pressing plate 21 is in contact with the lead frame. When the lead frame is not in place in the mold, it is in an inclined state. At this time, the pressing plate 21 is in contact with the lead frame, and the pressing plate 21 is also in an inclined state. In the above embodiment, the detection component 22 can be arranged at both ends of the pressing plate 21. After the connecting subassembly 221 connects the pressing plate 21 and the substrate 1, the pressing plate 21 is in a movable state. The pressing plate 21 adjusts its own position according to the position of the lead frame in the mold. The detection subassembly 222 detects whether the lead frame is in place in the mold.

[0024] There are various structures of the connecting subassembly 221. Preferably, the connecting subassembly 221 includes a connecting body 2211 and a first elastic body 2212. A first through hole 211 is provided at a position opposite to the pressing plate 21 and the connecting body 2211. The top end of the connecting body 2211 passes through the base 1, and the top of the connecting body 2211 overlaps the top surface of the base 1. The bottom end of the connecting body 2211 is located in the first through hole 211 of the pressing plate, and the bottom of the connecting body 2211 overlaps the pressing plate 21. The first elastic body 2212 is sleeved on the connecting body 2211, and one end of the first elastic body 2212 abuts against the top surface of the pressing plate 21, and the other end of the first elastic body 2212 abuts against the base 1.

[0025] When the connecting subassembly 221 of the above embodiment is working, the pressing plate 21 contacts the lead frame located in the mold. When the lead frame is in place in the mold, the lead frame is in a horizontal state, and the pressing plate 21 is also in a horizontal state. When the lead frame is not in place in the mold, the lead frame is in an inclined state, and the pressing plate 21 is also in an inclined state. Specifically, the base 1 moves downward, and the pressing plate 21 moves downward with the base 1. If the lead frame is in an inclined state, when the pressing plate 21 touches the inclined lead frame, the base 1 continues to be applied with a downward force, and the pressing plate 21 moves upward. In this process, the first elastomer 2212 is compressed, and the connector 2211 moves upward.

[0026] Preferably, the bottom of the connecting body 2211 overlaps the pressing plate 21, including: a stopper 2213 is provided at the bottom of the connecting body 2211, the stopper 2213 is adapted to the boss in the first through hole 211, and the stopper 2213 is located below the boss. The stopper 2213 is provided to prevent the pressing plate 21 from falling. In this preferred example, the stopper 2213 is provided to achieve connection between the pressing plate 21 and the base 1 through the connecting body 2211.

[0027] Preferably, the top of the connector 2211 overlaps the top surface of the base 1, including: the top and bottom edges of the connector 2211 fit the top surface of the base 1. The top of the connector 2211 is not fixedly connected to the base 1. When the pressing plate 21 moves upward, the top of the connector 2211 is separated from the top surface of the base 1.

[0028] Preferably, the detection subassembly 222 includes a detection body 2221, a second elastic body 2222, and a detector 2223. A second through hole 212 is provided at a position of the pressure plate 21 opposite to the detection body 2221. The detector 2223 is fixedly connected to the base 1, the bottom end of the detection body 2221 is located in the second through hole 212 of the pressure plate, and the bottom of the detection body 2221 overlaps the pressure plate 21; the top end of the detection body 2221 passes through the base 1, and the second elastic body 2222 is sleeved on the detection body 2221, and one end of the second elastic body 2222 abuts against the detection body 2221, and the other end abuts against the base 1.

[0029] The detector 2223 can be a sensor. The detector 2223 can be fixedly connected to the base 1 through a fixed block. When the lead frame is not in place in the mold, the lead frame is in a tilted state, and the pressure plate 21 is also in a tilted state. At this time, for the detection subassembly 222, the base 1 moves downward, and the pressure plate 21 and the detection body 2221 both move upward. The top of the detection body 2221 enters the detection range of the detector 2223 to detect the tilt state of the lead frame. When the detection is completed, the base 1 is moved upward. Under the action of the second elastic body 2222, the pressure plate 21 and the detection body 2221 move downward. The top of the detection body 2221 returns to the initial position and moves out of the detection range of the detector 2223. The second elastic body 2222 is set, which can also play a role in buffering the movement of the pressure plate 21 and the detection body 2221.

[0030] Preferably, the bottom end of the detection body 2221 is flush with the bottom of the second through hole 212 of the pressing plate. In this way, when the pressing plate 21 moves upward, the detection body 2221 also moves upward synchronously. This can more accurately detect the tilt state of the lead frame.

[0031] Preferably, the bottom of the detection body 2221 overlaps with the pressing plate 21, including: the bottom end of the detection body 2221 located outside the second through hole 212 is in contact with the top surface of the pressing plate 21. In this way, when the pressing plate 21 moves upward, the detection body 2221 also moves upward synchronously. This can more accurately detect the tilt state of the lead frame. After the detection is completed, since the bottom end of the detection body 2221 located outside the second through hole 212 is in contact with the top surface of the pressing plate 21, when the detection body 2221 moves downward, it presses the pressing plate 21 to move downward.

[0032] The lead frame is pressed against the mold surface. If an abnormality occurs, the lead frame cannot be smoothly put into place, and the detection body 2221 in the detection device will be lifted up. The detection body 2221 has freedom in the up and down directions. By default (i.e., no abnormality occurs), the second elastic body 2222 on the detection body 2221 presses it down. When encountering an obstacle, it overcomes the pressure of the second elastic body 2222 and moves upward, and is detected by the sensor 2223 located at the top.

[0033] In addition, when there is a slight deviation in the position of the lead frame, the detection device of this embodiment can automatically correct it so that the lead frame can be normally positioned. Specifically, when there is a slight deviation in the position of the lead frame, the pressing plate 21 has a tendency to press down under the action of the first elastic body 2212. During the pressing process of the pressing plate 21, it contacts the chamfered inclined surface at the upper end of the positioning pin on the mold, and under the guidance of the inclined surface, the lead frame is positioned in the correct position.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above specific embodiments. The above specific embodiments and the description in the specification are only for further illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of the present invention to be protected is defined by the claims and their equivalents.

Claims

1. A lead frame in-position detection device, characterized in that: It comprises a base (1), and a detection unit (2) connected to the base (1), wherein the detection unit (2) is used to detect whether the lead frame is completely in place in the mold; The detection unit (2) comprises a pressing plate (21) and at least two detection components (22); the pressing plate (21) is located below the base (1); the detection component (22) comprises a connecting subcomponent (221) and a detection subcomponent (222); the connecting subcomponent (221) is used to connect the pressing plate (21) and the base (1); and the pressing plate (21) is movable; and the detection subcomponent (222) is used to detect whether the lead frame is in place; The connecting subassembly (221) comprises a connecting body (2211) and a first elastic body (2212); a first through hole (211) is provided at a position where the pressing plate (21) and the connecting body (2211) are opposite to each other; the top end of the connecting body (2211) passes through the base body (1), and the top of the connecting body (2211) overlaps with the top surface of the base body (1); the bottom end of the connecting body (2211) is located in the first through hole (211) of the pressing plate, and the bottom of the connecting body (2211) overlaps with the pressing plate (21); The first elastic body (2212) is sleeved on the connecting body (2211), and one end of the first elastic body (2212) abuts against the top surface of the pressing plate (21), and the other end of the first elastic body (2212) abuts against the base body (1); The detection subassembly (222) comprises a detection body (2221), a second elastic body (2222), and a detector (2223); a second through hole (212) is provided at a position of the pressing plate (21) opposite to the detection body (2221); the detector (2223) and the base (1) are fixedly connected, the bottom end of the detection body (2221) is located in the second through hole (212) of the pressing plate, and the bottom of the detection body (2221) overlaps the pressing plate (21); the top end of the detection body (2221) passes through the base (1), the second elastic body (2222) is sleeved on the detection body (2221), and one end of the second elastic body (2222) abuts against the detection body (2221), and the other end abuts against the base (1).

2. The lead frame in-position detection device according to claim 1, characterized in that: The number of the detection units (2) is four or eight.

3. The lead frame in-position detection device according to claim 1, characterized in that: The bottom of the connecting body (2211) overlaps the pressing plate (21), including: a limiting member (2213) is provided at the bottom of the connecting body (2211), the limiting member (2213) is adapted to the boss in the first through hole (211), and the limiting member (2213) is located below the boss.

4. The lead frame in-position detection device according to claim 1, characterized in that: The top of the connecting body (2211) overlaps with the top surface of the base body (1), including: the top and bottom edges of the connecting body (2211) are in contact with the top surface of the base body (1).

5. The lead frame in-position detection device according to claim 1, characterized in that: The bottom end of the detection body (2221) is flush with the bottom of the second through hole (212) of the pressing plate.

6. The lead frame in-position detection device according to claim 1, characterized in that: The bottom of the detection body (2221) and the pressing plate (21) are overlapped, including: the bottom end of the detection body (2221) located outside the second through hole (212) and the top surface of the pressing plate (21) are in contact with each other.

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