Immersion tank for removing flash of lead frame of high-density integrated circuit

Abstract

The utility model relates to the technical field of lead frame processing equipment, in particular to a soaking tank for removing flash of a high-density integrated circuit lead frame, which comprises a liquid storage tank, a first rotating shaft and a second rotating shaft which are axially and horizontally arranged are rotatably arranged on the liquid storage tank, a first chain wheel is arranged on the first rotating shaft, and a second chain wheel is arranged on the second rotating shaft. A chain is wound on the first chain wheel and the second chain wheel, the lower half section of the chain is arranged in the liquid storage tank, and mounting strips which are arranged side by side are fixedly arranged on all inner chain plates and all outer chain plates of the chain; every two adjacent mounting strips form a group, and each group of mounting strips on the chain is provided with a supporting part used for supporting the lead frame. The lead frames are driven by the chains to move so as to be immersed in the liquid medicine, so that the soaking time of the lead frames placed on different supporting parts is the same, and the chains are driven to move after feeding and discharging are completed, so that the different lead frames are continuously and automatically soaked.

Description

Technical Field

[0001] The utility model relates to the technical field of lead frame processing equipment, in particular to an immersion tank for removing overflow materials from lead frames of high-density integrated circuits. Background Technique

[0002] In the process of integrated circuit manufacturing, as a key component connecting the chip and the external circuit, the surface quality of the lead frame directly affects the final packaging effect and the reliability of the product. However, in the plastic packaging process of the lead frame, due to the gap between the mold and the lead frame and the fluidity of the plastic packaging material, overflow materials often form on the surface of the lead frame, mainly including black slag and transparent wax-like substances. If these overflow materials are not thoroughly removed in subsequent processing, it will seriously affect the uniformity and adhesion of the electroplating layer, and then cause a series of problems such as exposed copper, uneven plating, and poor weldability.

[0003] At present, the industry mainly uses traditional methods such as mechanical sandblasting, alkaline electrolysis, and chemical immersion to remove overflow materials; although the mechanical sandblasting method has a low cost, it is easy to damage the surface and pins of the lead frame, and the efficiency is not high; the alkaline electrolysis method removes overflow materials through electrolysis, but it takes a long time and has low efficiency; the chemical immersion method first softens the overflow materials with chemical potions and then rinses them off. However, the existing immersion equipment cannot continuously immerse different lead frames, and it cannot ensure that the immersion time of each lead frame is the same, and there are also problems of long time consumption and low efficiency. Therefore, an immersion tank for removing overflow materials from lead frames of high-density integrated circuits is provided to solve the above technical problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an immersion tank for removing overflow materials from lead frames of high-density integrated circuits in view of the deficiencies of the prior art, so as to solve the technical problems that the existing immersion equipment cannot continuously immerse different lead frames and cannot ensure that the immersion time of each lead frame is the same.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] An immersion tank for removing overflow materials from lead frames of high-density integrated circuits includes a liquid storage tank. A first rotating shaft and a second rotating shaft that are axially horizontally arranged and parallel to each other are rotatably provided on the liquid storage tank. A first sprocket is installed on the first rotating shaft, and a second sprocket is installed on the second rotating shaft. A chain is wound around the first sprocket and the second sprocket. The lower half of the chain is placed in the liquid storage tank. Mounting strips arranged side by side are fixedly provided on each inner link plate and each outer link plate of the chain; every two adjacent mounting strips are a group, and support components for supporting the lead frame are installed on each group of mounting strips on the chain.

[0007] Further, the supporting components include a positive material hook fixedly arranged on one of a set of mounting bars, and a negative material hook fixedly arranged on another adjacent mounting bar. There are at least two positive material hooks and negative material hooks. The positive material hooks and negative material hooks are opposite and cross - arranged to form a placement position for placing the lead frame between them.

[0008] Further, a feeding component for conveying the lead frame to the corresponding supporting component is installed on the liquid storage tank, and a pushing cylinder for horizontally pushing out the soaked lead frame from the supporting component is also installed. The feeding component is close to the first sprocket, and the pushing cylinder is close to the second sprocket.

[0009] Further, a third rotating shaft with an axial direction parallel to the axial direction of the first rotating shaft is rotatably arranged in the liquid storage tank, and a first tension sprocket with the same number as the number of the first sprockets is installed on the third rotating shaft; a second tension sprocket that can move up and down and is used to cooperate with the first tension sprocket to adjust the chain tension is arranged on the liquid storage tank, and the number of the second tension sprockets is the same as the number of the first sprockets.

[0010] Further, a support rod is fixedly arranged in the liquid storage tank, and a support seat placed above the notch of the liquid storage tank is installed at the top of the support rod. An adjustable block that can be adjusted up and down is arranged on the support seat, and a fourth rotating shaft with an axial direction parallel to the axial direction of the first rotating shaft is rotatably arranged on the adjustable block. The second tension sprocket is installed on the fourth rotating shaft.

[0011] Further, a support frame is fixedly arranged in the liquid storage tank, and a sliding frame is horizontally slidably arranged on the support frame. The sliding direction of the sliding frame is parallel to the axial direction of the first rotating shaft, and a limiting plate placed in the liquid storage tank and used to limit the lead frame during the soaking process is installed on the sliding frame.

[0012] The beneficial effects of the present utility model: During use, after horizontally conveying the lead frame into the supporting component, the supporting component supports the lead frame. Subsequently, the first rotating shaft or the second rotating shaft is driven to intermittently rotate clockwise, and the chain is driven to intermittently move through the first sprocket and the second sprocket. The chain drives the mounting bar and each supporting component installed on the mounting bar to move together, so as to successively convey the lead frame into different supporting components and realize the feeding of the lead frame.

[0013] When the chain drives the lead frame to be in its lower half section, the lead frame will be immersed in the liquid medicine to soak and soften the overflow material on the lead frame. When the chain drives the lead frame to be in its upper half section, the lead frame is taken out of the liquid medicine. While feeding the lead frame, the soaked lead frame is horizontally pushed out from the supporting component to realize the discharging of the lead frame.

[0014] The chain moves to drive the newly loaded lead frame to immerse in the potion, so that the lead frame is always immersed in the potion when it is placed in the lower half of the chain. When the chain drives the lead frame to be placed in the upper half, the lead frame will be taken out of the potion. The chain drives the lead frame to move to immerse it in the potion, so that the immersion time of each lead frame placed on different supporting parts is the same. When the chain stops moving, loading and unloading are carried out. After loading and unloading are completed, the chain is driven to move again, and this cycle is repeated to realize the automatic immersion treatment of different lead frames. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0016] Figure 2 It is a schematic diagram of the structure of the positive material hook and the negative material hook of the utility model.

[0017] Figure 3 It is a structural schematic diagram of the placement position of the utility model.

[0018] Figure 4 It is a structural schematic diagram of the second tension sprocket adjustment part of the utility model.

[0019] Reference numerals include:

[0020] 81. Liquid storage tank; 82. First rotating shaft; 83. Second rotating shaft; 84. First sprocket; 85. Second sprocket; 86. Chain; 87. Mounting bar; 88. Positive material hook; 89. Negative material hook; 810. Third rotating shaft; 811. First tension sprocket; 812. Second tension sprocket; 8121. Support rod; 8122. Support seat; 8123. Adjustment block; 8124. Fourth rotating shaft; 813. Support frame; 814. Sliding frame; 815. Limiting plate; 816. Adjusting cylinder; 817. Pushing cylinder; 818. Feeding component; 819. Detection wheel; 820. Liquid inlet pipe; 821. Placement position. DETAILED DESCRIPTION

[0021] The following is a detailed description of the immersion tank for deburring the lead frame of a high-density integrated circuit according to the present invention in conjunction with the accompanying drawings.

[0022] like Figure 1As shown in the figure, an embodiment of the immersion tank for removing overflow materials from the lead frame of the high-density integrated circuit of the present utility model includes a liquid storage tank 81 for containing the chemical solution. The temperature of the chemical solution in the liquid storage tank 81 is between 75°C and 100°C. After the lead frame is immersed in the chemical solution for a specified time, the excess overflow materials on the lead frame can be softened, so as to facilitate the subsequent removal of the softened overflow materials by a high-pressure water gun, realizing automatic overflow material removal. In order to immerse the lead frame in the chemical solution for a specified time, a first rotating shaft 82 and a second rotating shaft 83 which are axially horizontally arranged and parallel to each other are rotatably provided on the liquid storage tank 81. Among them, a first sprocket 84 is installed on the first rotating shaft 82, and a second sprocket 85 is installed on the second rotating shaft 83. A chain 86 is wound around the first sprocket 84 and the second sprocket 85. By driving the first rotating shaft 82 or the second rotating shaft 83 to rotate, the first sprocket 84 or the second sprocket 85 can be driven to rotate, thereby driving the chain 86 to move. Installation bars 87 are fixedly provided on each inner link plate and each outer link plate of the chain 86. The installation bars 87 are arranged side by side. Every two adjacent installation bars 87 are a group (there are multiple groups of installation bars 87 on the chain 86. For example, if there are three installation bars 87 arranged side by side, there are two groups of installation bars 87; if there are four installation bars 87 arranged side by side, there are three groups of installation bars 87). Support components for supporting the lead frame are installed on each group of installation bars 87 on the chain 86.

[0023] An inlet component 818 for conveying the lead frame to the corresponding support component is installed on the liquid storage tank 81. Through the inlet component 818, the lead frame to be removed of overflow materials is horizontally conveyed into the support component. The support component performs a support process on the lead frame. Subsequently, the first rotating shaft 82 or the second rotating shaft 83 is intermittently driven to rotate clockwise (the rotation direction is based on Figure 1Rotating with [a certain reference], it drives the chain 86 to perform intermittent movement through the first sprocket 84 and the second sprocket 85. The chain 86 drives the mounting strip 87 and the supporting components installed on the mounting strip 87 to move together, so that each supporting component can accurately align with the feeding component 818. The chain 86 drives multiple supporting components to move intermittently and cooperate with the feeding component 818 to convey the lead frames one by one into different supporting components. The lower half of the chain 86 is placed in the liquid storage tank 81. When the chain 86 drives the lead frame to be placed on its lower half, the lead frame will be immersed in the liquid medicine, and the overflow material on the lead frame will be soaked and softened. When the chain 86 drives the lead frame to be placed on its upper half, the lead frame will be taken out of the liquid medicine; by the way that the chain 86 drives the lead frame to move and immerse it in the liquid medicine, the soaking time of each lead frame placed on different supporting components is the same. And, in order to push out the soaked lead frame from the supporting component, a pushing cylinder 817 for horizontally pushing out the soaked lead frame from the supporting component is installed on the liquid storage tank 81. The feeding component 818 is close to the first sprocket 84, and the pushing cylinder 817 is close to the second sprocket 85; when the chain 86 stops moving, the supporting component without a lead frame placed on it aligns with the feeding component 818. At the same time, the supporting component with a soaked lead frame placed on it aligns with the pushing cylinder 817. The feeding component 818 and the pushing cylinder 817 are run simultaneously to convey the lead frame to be soaked into the supporting component and push out the soaked lead frame from the supporting component. Then, the chain 86 is driven to drive the lead frame to move, so that the next supporting component aligns with the feeding component 818 and the pushing cylinder 817 respectively. In this way, the automatic soaking treatment of the lead frame is realized. In addition, at least two first sprockets 84 and second sprockets 85 can be provided on the first rotating shaft 82 and the second rotating shaft 83. The chain 86 wound around another first sprocket 84 and second sprocket 85 is also fixedly arranged with the mounting strip 87. Under the action of setting at least two chains 86, the mounting strip 87 can be driven to move more stably.

[0024] Preferably, the supporting component includes a positive material hook 88 fixedly arranged on one of a group of mounting strips 87, and a negative material hook 89 fixedly arranged on another adjacent mounting strip 87. There are at least two positive material hooks 88 and negative material hooks 89. The positive material hook 88 and the negative material hook 89 are opposite and cross-arranged so that a placement position 821 for placing the lead frame is formed between them (as Figure 3 shown); after driving the lead frame to be immersed in the liquid medicine, through the cross cooperation of the positive material hook 88 and the negative material hook 89, the hook parts of the positive material hook 88 and the negative material hook 89 form a supporting platform for holding the lead frame, preventing the lead frame from falling into the liquid storage tank 81.

[0025] Furthermore, a third rotating shaft 810 whose axis is parallel to the axis of the first rotating shaft 82 (or the second rotating shaft 83) is rotatably provided in the liquid storage tank 81. A first tension sprocket 811 with the same number as that of the first sprocket 84 (or the second sprocket 85) is installed on the third rotating shaft 810; a second tension sprocket 812 which can move up and down and is used to cooperate with the first tension sprocket 811 to adjust the tension of the chain 86 is provided on the liquid storage tank 81, and the number of the second tension sprockets 812 is also the same as that of the first sprocket 84 (or the second sprocket 85); the first tension sprocket 811 contacts the lower half section of the chain 86, and the second tension sprocket 812 contacts the upper half section of the chain 86. First, the chain 86 is tensioned to a certain extent by the first tension sprocket 811, and then the up-and-down movement of the second tension sprocket 812 is controlled to finely adjust the tension of the chain 86, so that the placement positions 821 can be accurately aligned with the feeding component 818, and at the same time, the pushing cylinder 817 can also be aligned with the lead frame after soaking.

[0026] To prevent the lead frame from detaching from the placement position 821, a support frame 813 is fixedly provided in the liquid storage tank 81, and a sliding frame 814 is horizontally slidably provided on the support frame 813. The sliding direction of the sliding frame 814 is parallel to the axis of the first rotating shaft 82 (or the second rotating shaft 83). A limiting plate 815 which is placed in the liquid storage tank 81 and is used to limit the lead frame during the soaking process is installed on the sliding frame 814; by controlling the horizontal sliding of the sliding frame 814 on the support frame 813 to adjust the position of the limiting plate 815 to adapt to lead frames of different sizes, under the action of the limiting plate 815, the lead frame immersed in the liquid medicine is always placed in the placement position 821. Additionally, an adjusting cylinder 816 for driving the sliding frame 814 to slide is installed outside the liquid storage tank 81.

[0027] As Figure 4 shown, in order to adjust the position of the second tension sprocket 812, a support rod 8121 is fixedly provided in the liquid storage tank 81, and a support seat 8122 placed above the notch of the liquid storage tank 81 is installed at the top of the support rod 8121. An adjusting block 8123 capable of being adjusted up and down is provided on the support seat 8122, and a fourth rotating shaft 8124 whose axis is parallel to the axis of the first rotating shaft 82 (or the second rotating shaft 83) is rotatably provided on the adjusting block 8123. The second tension sprocket 812 is installed on the fourth rotating shaft 8124. By adjusting the height of the adjusting block 8123 to adjust the height of the second tension sprocket 812, thereby adjusting the tension of the chain 86, so that each time the chain 86 stops intermittently, the placement positions 821 can be accurately aligned with the feeding component 818, and at the same time, the pushing cylinder 817 can also be aligned with the lead frame after soaking.

[0028] A detection wheel 819 for detecting the rotation angle of the second sprocket 85 is installed at the end of the second rotating shaft 83. Convex teeth are provided on the circumferential edge of the detection wheel 819, and an infrared sensor (not shown in the figure) for detecting the rotation angle of the detection wheel 819 is installed outside the liquid storage tank 81. When the first sprocket 84 drives the chain 86 to move, the detection wheel 819 rotates, and the convex teeth on the detection wheel 819 are detected by the infrared sensor to detect the number of convex teeth passing through the infrared sensor, so as to further ensure the accuracy of loading and unloading the lead frame. A liquid inlet pipe 820 with a valve is connected to the bottom of the liquid storage tank 81, and the liquid medicine in the liquid storage tank 81 can be replenished through the liquid inlet pipe 820.

[0029] In summary, it can be seen that the present utility model has the excellent characteristics described above, so that it can enhance the efficiency never achieved in the prior art during use and has practicability, becoming a product with extremely high practical value.

[0030] The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present utility model.

Claims

1. Immersion tank for removing overflow material from lead frames of high-density integrated circuits, characterized in that: It includes a liquid storage tank (81). Rotatably arranged on the liquid storage tank (81) are a first rotating shaft (82) and a second rotating shaft (83) that are horizontally arranged axially and parallel to each other. A first sprocket (84) is installed on the first rotating shaft (82), and a second sprocket (85) is installed on the second rotating shaft (83). A chain (86) is wound around the first sprocket (84) and the second sprocket (85). The lower half of the chain (86) is placed inside the liquid storage tank. Mounting strips (87) arranged side by side are fixedly provided on each inner link plate and each outer link plate of the chain (86); every two adjacent mounting strips (87) form a group, and support components for supporting the lead frame are installed on each group of mounting strips (87) on the chain (86).

2. The soaking tank for removing overflow material of the lead frame of the high-density integrated circuit according to claim 1, wherein: The support component includes a positive material hook (88) fixedly arranged on one of the mounting strips (87) in a group of mounting strips (87), and a reverse material hook (89) fixedly arranged on another adjacent mounting strip (87). There are at least two positive material hooks (88) and reverse material hooks (89). The positive material hook (88) and the reverse material hook (89) are opposite and cross-arranged so as to form a placement position (821) for placing the lead frame between them.

3. The soaking tank for removing overflow material of the high-density integrated circuit lead frame according to claim 1, characterized in that: An inlet component (818) for conveying the lead frame to the corresponding support component is installed on the liquid storage tank (81), and a pushing cylinder (817) for horizontally pushing out the lead frame after soaking from the support component is also installed. The inlet component (818) is close to the first sprocket (84), and the pushing cylinder (817) is close to the second sprocket (85).

4. The soaking tank for removing overflow material of the high-density integrated circuit lead frame according to claim 1, characterized in that: A third rotating shaft (810) whose axis is parallel to the axis of the first rotating shaft (82) is rotatably arranged inside the liquid storage tank (81). A first tension sprocket (811) with the same number as that of the first sprocket (84) is installed on the third rotating shaft (810); on the liquid storage tank (81), there is a second tension sprocket (812) that can move up and down and is used to cooperate with the first tension sprocket (811) to adjust the tension of the chain (86). The number of the second tension sprockets (812) is the same as that of the first sprockets (84).

5. The soaking tank for removing overflow material of the high-density integrated circuit lead frame according to claim 4, characterized in that: A support rod (8121) is fixedly arranged inside the liquid storage tank (81), and a support seat (8122) placed above the notch of the liquid storage tank (81) is installed at the top of the support rod (8121). An adjusting block (8123) that can be adjusted up and down is provided on the support seat (8122). A fourth rotating shaft (8124) whose axis is parallel to the axis of the first rotating shaft (82) is rotatably arranged on the adjusting block (8123), and the second tension sprocket (812) is installed on the fourth rotating shaft (8124).

6. The soaking tank for removing overflow materials of the high-density integrated circuit lead frame according to claim 1, characterized in that: A support frame (813) is fixedly arranged inside the liquid storage tank (81), and a sliding frame (814) is horizontally slidably arranged on the support frame (813). The sliding direction of the sliding frame (814) is parallel to the axis of the first rotating shaft (82). A limiting plate (815) placed inside the liquid storage tank (81) and used to limit the lead frame during the soaking process is installed on the sliding frame (814).

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