Material rack transferring device and feeding system

Abstract

The utility model provides a material rack transfer device and a feeding system, the material rack transfer device comprises a translation mechanism and a lifting mechanism, and the translation mechanism comprises two guide structures and a movable rack movably arranged on the two guide structures; wherein the lifting mechanism comprises a rotating shaft, two eccentric bearings and two cantilevers, the rotating shaft is arranged on the moving frame, the two eccentric bearings and the two cantilevers are arranged on the rotating shaft, the two cantilevers are fixedly connected with the material frame, and the translation mechanism and the lifting mechanism respectively drive the two cantilevers to move horizontally and vertically, so that the material frame is transferred into a mold cavity of the hot pressing device. The material rack transfer device provided by the utility model can more stably transfer the material rack into the mold cavity of the hot pressing device, is beneficial to accurate alignment of the plastic package material rack and the mold of the hot pressing device, and further ensures the production quality of semiconductor chips.

Description

Technical Field

[0001] The utility model belongs to the technical field of semiconductors, and more specifically, relates to a material rack transfer device and a material feeding system. Background Art

[0002] Packaging technology is the technology of packaging semiconductor integrated circuit chips with insulating plastic or ceramic materials. It is crucial to the chip manufacturing process because the chips must be isolated from the outside world to prevent impurities in the air from corroding the chips and causing the chip's electrical performance to deteriorate. In addition, packaged chips are also easier to install, transport and store.

[0003] At present, the plastic encapsulation process of semiconductor chips is usually as follows: the frame loading device and the material loading device correspond to automatically loading the lead frame and the plastic encapsulation material respectively; the frame transmission device and the material transmission device correspond to transmitting the lead frame and the plastic encapsulation material from the frame loading device and the material loading device to the two sides of the loading platform respectively; the material rack loading device positions and loads the lead frame and the plastic encapsulation material from the frame transmission device and the material transmission device to the frame unloading port and the feeding barrel of the plastic encapsulation material rack supported by the loading platform; the material rack transfer device positions and transfers the plastic encapsulation material rack, lead frame and plastic encapsulation material to the mold cavity of the hot pressing device.

[0004] The rack transfer device includes: a linear drive module, which is arranged at the top of the base and located on the side of the material transmission device away from the loading platform in the second horizontal direction X, and is used to drive the moving part to move linearly along the first horizontal direction Y; a fourth lifting module, which is installed on the moving part, and is used to drive another moving part to move vertically up and down, and the plastic packaging rack is fixedly installed on the other moving part through a cantilever. The existing solution connects the plastic packaging rack and the linear drive module through a cantilever, and the cantilever has a curvature. The existing rack transfer device is prone to instability when transferring the plastic packaging rack, resulting in inaccurate alignment of the plastic packaging rack and the mold of the hot pressing device, thereby affecting the production quality of semiconductor chips. Utility Model Content

[0005] The utility model aims to provide a material rack transfer device and a material feeding system to solve the problem of unstable material rack transfer in the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The utility model provides a material rack transfer device, which is used to transfer a material rack on which a lead frame and a plastic packaging material are placed. The material rack transfer device comprises:

[0008] A translation mechanism, comprising two guide structures located on both sides of the material rack, and a moving rack movably arranged between the two guide structures;

[0009] The lifting mechanism is respectively connected to the mobile frame and the material frame, and includes a rotating shaft arranged on the mobile frame, two eccentric bearings arranged at both ends of the rotating shaft, and two cantilevers arranged at intervals. The first end of each cantilever is arranged on the rotating shaft and the first end is close to the corresponding eccentric bearing, and the second end is fixedly connected to the material frame.

[0010] Furthermore, the movable frame is provided with two guide seats corresponding to the two cantilevers, each guide seat includes a vertical guide rail fixedly arranged on the movable frame, and a movable plate movably arranged on the vertical guide rail, and the movable plate is also fixedly connected to the corresponding cantilever.

[0011] Furthermore, the movable frame is provided with two support seats corresponding to the eccentric bearing, and each support seat is provided with a limiting groove for limiting the eccentric bearing in the axial direction.

[0012] Furthermore, the lifting mechanism also includes a rotation drive module for driving the rotating shaft to rotate, the rotation drive module includes a motor and a transmission component arranged between the two cantilevers, the transmission component includes a driving wheel connected to the output shaft of the motor, a driven wheel arranged on the rotating shaft, and a conveyor belt arranged on the driving wheel and the driven wheel.

[0013] Furthermore, the rotation driving module further comprises a fixing plate, two sides of the fixing plate are connected to the two cantilevers, and the motor is fixedly arranged on the fixing plate.

[0014] Furthermore, the lifting mechanism also includes a transverse connecting plate provided on the second ends of the two cantilevers, and a longitudinal connecting plate connected to the transverse connecting plate, and the longitudinal connecting plate is fixedly provided on the material rack.

[0015] Furthermore, four square holes are arranged at intervals on the transverse connecting plate.

[0016] Further, the two guide structures include a first guide structure and a second guide structure having different structures from each other, the first guide structure includes a horizontal slide and a limit plate arranged in parallel on the horizontal slide, and the second guide structure includes a support frame and a horizontal guide rail fixedly arranged on the support frame;

[0017] The first side of the movable frame is arranged on the limiting plate and the first side is movably connected to the horizontal slide, and the second side is movably connected to the horizontal guide rail.

[0018] Furthermore, the first end of each cantilever is higher than the second end.

[0019] The utility model also provides a feeding system, including a first base and a preheating table arranged on the first base and a material rack transferring device as described above, wherein the preheating table is provided with a material rack, the material rack is provided with a frame unloading port for placing a lead frame and a feeding barrel for placing a plastic packaging material, and the material rack transferring device is used to transfer the material rack together with the lead frame and the plastic packaging material.

[0020] The beneficial effects of the material rack transfer device and feeding system provided by the utility model are as follows: compared with the prior art, the utility model is provided with a translation mechanism including two guide structures and a mobile rack movably arranged on the two guide structures, and a lifting mechanism including a rotating shaft arranged on the mobile rack and two eccentric bearings and two cantilevers arranged on the rotating shaft, and the two cantilevers are fixedly connected to the material rack, and the translation mechanism and the lifting mechanism respectively drive the two cantilevers to move horizontally and vertically to realize the transfer of the material rack to the mold cavity of the hot pressing device. The material rack transfer device provided by the utility model can more smoothly transfer the material rack to the mold cavity of the hot pressing device, which is beneficial to the accurate alignment of the material rack and the mold of the hot pressing device, thereby ensuring the production quality of semiconductor chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 labor.

[0022] Figure 1 A schematic diagram of the structure of the rack transfer device provided by an embodiment of the utility model from a first angle;

[0023] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0024] Figure 3 A schematic diagram of the structure of the rack transfer device provided by an embodiment of the utility model from a second angle;

[0025] Figure 4 for Figure 3 The enlarged structural diagram at B in the middle;

[0026] Figure 5 A schematic diagram of the structure of a feeding system provided in an embodiment of the utility model;

[0027] Figure 6 A top view of a portion of the structure of the feeding system provided in an embodiment of the utility model;

[0028] Among them, the main marks of the drawings in the figure are:

[0029] 100, material rack; 11, frame material discharge port; 12, material barrel; 200, material rack transfer device; 21, guide structure; 211, first guide structure; 2111, support frame; 2112, horizontal guide rail; 212, second guide structure; 2121, horizontal slide; 2122, limit plate; 22, mobile rack; 221, rotating shaft; 222, eccentric bearing; 223, cantilever; 224, rotating drive module; 2241, fixed plate; 2242, motor; 2243, transmission component; 225, support seat; 2250, limit groove; 226, guide seat; 2261, vertical guide rail; 2262, movable plate; 227, horizontal connecting plate; 2270, square hole; 228, longitudinal connecting plate; 31, first base; 32, second base; 311, preheating table; 321, hot pressing device. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] The principle and structure of the present utility model are described in detail below with reference to the accompanying drawings and embodiments.

[0036] like Figure 1 , Figure 2 As shown, this embodiment provides a material rack transfer device 200 for transferring the material rack 100, and the material rack transfer device 200 includes a translation mechanism and a lifting mechanism. The translation mechanism includes two guide structures 21 located on both sides of the material rack 100, and a mobile rack 22 movably arranged between the two guide structures 21. The lifting mechanism is connected to the mobile rack 22 and the material rack 100, respectively, and includes a rotating shaft 221 arranged on the mobile rack 22, two eccentric bearings 222 arranged at both ends of the rotating shaft 221, and two cantilevers 223 arranged at intervals, the first end of each cantilever 223 is arranged on the rotating shaft 221 and the first end is close to the corresponding eccentric bearing 222, and the second end is fixedly connected to the material rack 100. In this embodiment, two cantilevers 223 are arranged to be fixedly connected to the material rack 100, and the translation mechanism and the lifting mechanism respectively drive the two cantilevers 223 to move horizontally and vertically to realize the transfer of the material rack 100, thereby ensuring that the transfer of the material rack 100 is more stable.

[0037] In this embodiment, the translation mechanism may include two guide structures 21 with the same structure, or two guide structures 21 with different structures may be provided, as long as the two guide mechanisms can allow the movable frame 22 to move horizontally.

[0038] like Figure 1As shown, taking the translation mechanism including two guide structures 21 with different structures as an example, the two guide structures 21 are respectively referred to as the first guide structure 211 and the second guide structure 212. The first guide structure 211 includes a support frame 2111 and a horizontal guide rail 2112 fixedly arranged on the support frame 2111, and the second guide structure 212 includes a horizontal slide 2121 and a limit plate 2122 arranged parallel to the horizontal slide 2121. The first side of the moving frame 22 is arranged on the limit plate 2122 and the first side is movably connected to the horizontal slide 2121, and the second side thereof is movably connected to the horizontal guide rail 2112. In this example, the translation drive module of the translation mechanism can be only arranged on the side of the first guide structure 211. The translation drive module is connected to the first side of the mobile frame 22. The translation drive module drives the first side of the mobile frame 22 to move on the horizontal slide 2121. When the first side of the mobile frame 22 moves, the second side of the mobile frame 22 moves on the horizontal guide rail 2112, so that the lifting mechanism can be driven to move together with the material rack 100 through the mobile frame 22.

[0039] In this embodiment, the lifting mechanism further includes a rotation driving module 224 for driving the rotation shaft 221 to rotate.

[0040] like Figure 2 As shown, the rotation drive module 224 includes a fixed plate 2241, a motor 2242 and a transmission assembly 2243. The fixed plate 2241 is mainly used to support and fix the motor 2242 and the transmission assembly 2243. Two rectangular holes are provided on the fixed plate 2241 to reduce weight. Both sides of the fixed plate 2241 are connected to the two cantilevers 223, and the motor 2242 is installed on the fixed plate 2241. The transmission assembly 2243 includes a driving wheel, a driven wheel and a conveyor belt, the driving wheel is connected to the output shaft of the motor 2242, the driven wheel is arranged on the rotating shaft 221, and the conveyor belt is arranged on the driving wheel and the driven wheel. When the rotation drive module 224 is working, the motor 2242 rotates and drives the driving wheel to rotate. At the same time, the driven wheel is driven to rotate through the conveyor belt, and then the rotating shaft 221 is driven to rotate together.

[0041] In this embodiment, two support seats 225 corresponding to the two eccentric bearings 222 are provided on the moving frame 22 to support and limit the two eccentric bearings 222 .

[0042] like Figure 2As shown, two support seats 225 are arranged at intervals on the mobile frame 22, and the two support seats 225 correspond to the two eccentric bearings 222. A limiting groove 2250 is arranged at the top of each support seat 225, and the limiting groove 2250 of each support seat 225 abuts against the circumferential surface of the corresponding eccentric bearing 222. By setting the limiting groove 2250, the eccentric bearing 222 can be limited in the axial direction to prevent the outer ring of the eccentric bearing 222 from being offset when the inner ring of the eccentric bearing 222 rotates with the rotating shaft 221.

[0043] In this embodiment, the lifting movement of the two cantilevers 223 is achieved by the rotation of the two eccentric bearings 222 , and two guide seats 226 corresponding to the two cantilevers 223 are further provided on the moving frame 22 to guide the lifting movement of the two cantilevers 223 .

[0044] like Figure 3 , Figure 4 As shown, two guide seats 226 are arranged at intervals on the mobile frame 22, and each guide seat 226 includes a vertical guide rail 2261 fixedly arranged on the mobile frame 22, and a movable plate 2262 movably arranged on the vertical guide rail 2261, and the movable plate 2262 is fixedly connected to the corresponding cantilever 223. When the two cantilever arms 223 move vertically, the corresponding two movable plates 2262 are driven to move along the extension direction of the vertical guide rail 2261.

[0045] like Figure 1 As shown, the first ends of the two cantilevers 223 are arranged on the mobile frame 22, and the second ends of the two cantilevers 223 are arranged on the material rack 100. Since the height of the mobile frame 22 is higher than the height of the material rack 100, the first ends of the two cantilevers 223 are higher than the second ends.

[0046] like Figure 2 As shown, the lifting mechanism further includes a transverse connecting plate 227 and a longitudinal connecting plate 228. The transverse connecting plate 227 is arranged on the second ends of the two cantilevers 223, and four square holes 2270 are arranged at intervals on the transverse connecting plate 227. The longitudinal connecting plate 228 is fixedly arranged on the material rack 100, and one end of the longitudinal connecting plate 228 is arranged below the transverse connecting plate 227, and the end is fixedly connected to the transverse connecting plate 227.

[0047] like Figure 5 , Figure 6 As shown, this embodiment also provides a feeding system, which includes a first base 31, on which a preheating table 311, a material rack 100 and a material rack transfer device 200 are provided, and the material rack 100 is placed on the preheating table 311. A second base 32 is arranged adjacent to the first base 31, and a hot pressing device 321 is provided on the second base 32. Figure 1As shown, the material rack 100 is provided with a frame feed opening 11 for placing the lead frame and a frame support plate for supporting the lead frame in the frame feed opening. The material rack 100 is also provided with a feeding cylinder 12 for placing the plastic encapsulation material and a baffle for supporting the plastic encapsulation material in the feeding cylinder 12. The material rack transfer device 200 is used to transfer the material rack 100 together with the lead frame and the plastic encapsulation material to the mold cavity of the hot pressing device 321. The specific structure of the material rack transfer device 200 is described in the previous text and will not be repeated here.

[0048] For ease of understanding, the working process of the rack transfer device 200 is described in detail below in combination with actual application scenarios.

[0049] In the waiting state, the two cantilevers 223 are in the lower position, and the material rack 100 is placed on the preheating table 311.

[0050] It should be noted that the material rack 100 is provided with a frame feed port 11 for placing the lead frame and a feeding tube 12 for placing the molding compound. The material rack 100 is also provided with a heat insulating block to insulate the feeding tube 12 to prevent heat from being quickly transferred to the molding compound, because the molding compound cannot be heated in advance before molding, and a chemical reaction will occur after the molding compound is heated, and the packaging quality will be affected due to a long heating time. The preheating station 311 mainly preheats the lead frame to expand the lead frame to the same size as the molding mold.

[0051] The frame clamping mechanism (e.g., mechanical claw) begins to clamp the lead frames one by one and transfer them to the frame unloading ports 11 on the material rack 100, so as to place the lead frames flat on the heating block for preheating. After all the frame unloading ports 11 on the material rack 100 are filled with lead frames, the material clamping mechanism (e.g., cylinder claw) begins to clamp the plastic encapsulation material and place it into the feeding tube 12 on the material rack 100.

[0052] After the feeding tube 12 on the material rack 100 is filled with plastic encapsulation material, the two cantilevers 223 are driven to rise together with the material rack 100 through the lifting mechanism, and the preheated lead frame and the plastic encapsulation material are lifted off the preheating table 311. Then, the two cantilevers 223 are driven to move horizontally together with the material rack 100 through the translation mechanism, and the material rack 100, the lead frame and the plastic encapsulation material are sent to the mold cavity of the hot pressing device 321 (i.e., the plastic encapsulation press). Then, the two cantilevers 223 are driven to descend together with the material rack 100 through the lifting mechanism, so that the material rack 100 is accurately aligned with the hot pressing lower mold.

[0053] The four small cylinders installed at the four corners of the rack 100 start to move, pulling out the frame support plate used to support the lead frame on the rack 100, so that the lead frame falls into the hot press lower mold (the hot press lower mold is provided with positioning pins to align the positioning holes on the lead frame). After all the lead frames on the rack 100 have fallen, the two cylinders installed on the side of the rack 100 start to move, driving the baffle used to support the plastic encapsulation material to move, so that the plastic encapsulation material falls into the barrel 12 in the hot press lower mold.

[0054] After the feeding work is completed, the two cantilevers 223 are driven to rise together with the material rack 100 through the lifting mechanism, and the two cantilevers 223 are driven to translate together with the material rack 100 through the translation mechanism, so that the material rack 100 returns to the initial position of the preheating table 311.

[0055] The plastic sealing press starts the mold closing action, the upper and lower molds are closed, and the hydraulic cylinder drives the injection head in the hot pressing lower mold to start injection molding.

[0056] The present embodiment provides a material rack transferring device and a feeding system. The material rack transferring device includes a translation mechanism and a lifting mechanism. The translation mechanism and the lifting mechanism respectively drive two cantilevers to move horizontally and vertically, thereby realizing the transfer of the material rack to the mold cavity of the hot pressing device. The material rack transferring device provided in the present embodiment can more smoothly transfer the material rack to the mold cavity of the hot pressing device, which is beneficial to the accurate alignment of the plastic packaging material rack and the mold of the hot pressing device, thereby ensuring the production quality of the semiconductor chip.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rack transfer device, used to transfer a rack on which a lead frame and a plastic packaging material are placed, characterized in that: The rack transfer device comprises: A translation mechanism, comprising two guide structures located on both sides of the material rack, and a moving rack movably arranged between the two guide structures; The lifting mechanism is respectively connected to the mobile frame and the material frame, and includes a rotating shaft arranged on the mobile frame, two eccentric bearings arranged at both ends of the rotating shaft, and two cantilevers arranged at intervals. The first end of each cantilever is arranged on the rotating shaft and the first end is close to the corresponding eccentric bearing, and the second end is fixedly connected to the material frame.

2. The rack transfer device according to claim 1, characterized in that: The movable frame is provided with two guide seats corresponding to the two cantilevers, each guide seat comprises a vertical guide rail fixedly arranged on the movable frame, and a movable plate movably arranged on the vertical guide rail, and the movable plate is also fixedly connected to the corresponding cantilever.

3. The rack transfer device according to claim 1, characterized in that: The movable frame is provided with two support seats corresponding to the eccentric bearing, and each support seat is provided with a limiting groove for limiting the eccentric bearing in the axial direction.

4. The rack transfer device according to claim 1, characterized in that: The lifting mechanism also includes a rotation drive module for driving the rotating shaft to rotate, the rotation drive module includes a motor and a transmission component arranged between the two cantilevers, the transmission component includes a driving wheel connected to the output shaft of the motor, a driven wheel arranged on the rotating shaft, and a conveyor belt arranged on the driving wheel and the driven wheel.

5. The rack transfer device according to claim 4, characterized in that: The rotation driving module further comprises a fixing plate, two sides of which are connected to the two cantilevers, and the motor is fixedly arranged on the fixing plate.

6. The rack transfer device according to claim 1, characterized in that: The lifting mechanism further comprises a transverse connecting plate arranged on the second ends of the two cantilevers, and a longitudinal connecting plate connected to the transverse connecting plate, wherein the longitudinal connecting plate is fixedly arranged on the material rack.

7. The rack transfer device according to claim 6, characterized in that: The transverse connecting plate is provided with four square holes at intervals.

8. The rack transfer device according to claim 1, characterized in that: The two guide structures include a first guide structure and a second guide structure that are different in structure from each other, the first guide structure includes a horizontal slide and a limit plate arranged parallel to the horizontal slide, and the second guide structure includes a support frame and a horizontal guide rail fixedly arranged on the support frame; The first side of the movable frame is arranged on the limiting plate and the first side is movably connected to the horizontal slide, and the second side is movably connected to the horizontal guide rail.

9. The rack transfer device according to claim 1, characterized in that: The first end of each cantilever is higher than the second end.

10. The feeding system is characterized in that: It comprises a first base and a preheating table arranged on the first base and a material rack transfer device as described in any one of claims 1 to 9, wherein the preheating table is provided with a material rack, the material rack is provided with a frame unloading port for placing a lead frame and a feeding barrel for placing a molding compound, and the material rack transfer device is used to transfer the material rack together with the lead frame and the molding compound.

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