A PIN pin overmolding mold

Abstract

This utility model discloses a PIN pin overmolding mold, relating to the field of overmolding mold technology. It includes a base frame and a top frame opposite to the base frame. The top frame and base frame are connected by at least one set of guiding mechanisms. An upper mold mechanism is provided at the bottom of the top frame, and a mounting shell is provided at the top of the base frame. Multiple lower mold mechanisms are arrayed within the mounting shell. The upper mold mechanism includes a first limiting post fixedly mounted on the top frame, and a clamping block elastically connected to the bottom of the first limiting post via a first elastic element. This utility model achieves high precision through the lower mold mechanism and a 60° conical positioning hole. This angle achieves the optimal balance between guidance and stability: too small an angle results in a short guiding stroke and poor effect; too large an angle easily leads to jamming. This ensures that the PIN pin is accurately guided to the correct final position, reducing the risk of product damage.

Description

Technical Field

[0001] This utility model relates to the field of overmolding mold technology, specifically an overmolding mold for PIN pins. Background Technology

[0002] Pins (also known as lead pins) are key components in electronic devices that enable electrical connections and mechanical fixation. They are widely used in many fields such as circuit boards, connectors, and integrated circuits. To achieve purposes such as insulation, corrosion resistance, shock resistance, and increased structural strength, a layer of plastic is usually wrapped around a specific part of the pin (such as the middle).

[0003] The existing patent (authorization announcement number: CN222079915U) discloses a PIN pin overmolding mold. The key technical point of the solution is that the overmolding mold is based on interlocking fixation to achieve fast, stable and precise placement of the injection molded part in the designated position, ensuring that the position of the terminal does not float during the injection molding process of each mold, improving the product yield, and overcoming the current problem that the terminal will not be fixed and will float during injection molding due to the gap fit between the metal terminal and the mold groove, and will occasionally overflow glue, resulting in defective terminal products, affecting the yield of sensor products and subsequent welding and assembly.

[0004] However, the above technical solutions still have certain defects. The pins are small and are prone to displacement or tilting during the mold closing process due to inaccurate positioning, resulting in inaccurate overmolding position. In addition, there is a small fitting gap between the pins and the mold cavity. Under high pressure injection, the molten material is prone to leak along the surface of the pins and wrap around the pin parts where there should be no material, forming waste products. Subsequent cleaning is extremely difficult. Therefore, a mold for overmolding pins is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a PIN pin overmolding mold to solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A PIN needle overmolding mold includes a base frame and a top frame disposed opposite to the base frame. The top frame and the base frame are connected by at least one set of guide mechanisms. An upper mold mechanism is provided at the bottom of the top frame, and a mounting shell is provided at the top of the base frame. Multiple sets of lower mold mechanisms are arrayed inside the mounting shell. The upper mold mechanism includes a first limiting post fixedly installed on the top frame. The clamping block is elastically connected to the bottom of the first limiting post through a first elastic element. The first elastic element is installed on the inner wall of the first limiting frame. The first limiting post slides on the inner wall of the first limiting frame. The top of the clamping block is also provided with two sets of sliding rods that pass through the top frame and are slidably connected to it. The clamping block is also covered with a limiting shell. Multiple limiting shells are provided and installed in the pull-out box. The pull-out box is slidably connected to the top frame. The lower mold mechanism includes a second limiting frame and an insertion block. The insertion block is housed within the first limiting frame and has multiple sets of insertion holes for inserting PIN pins. A limiting plate is located at the bottom of the insertion block and has multiple sets of positioning holes corresponding to the insertion holes. The connecting column is fixedly installed at the bottom of the limiting plate; The second limiting post is fixed on the base frame; The second fixing rod is elastically connected to the second limiting post through the second elastic element, and the upper end of the second fixing rod is fixedly connected to the limiting plate.

[0007] Based on the above technical solutions, this utility model also provides the following optional technical solutions: As a further embodiment of this utility model, the positioning hole is a tapered hole that is larger at the top and smaller at the bottom.

[0008] As a further improvement of this invention, the clamping block is made of an elastic material.

[0009] As a further improvement of this utility model: the guide mechanism is a telescopic rod, which includes an upper sliding rod and a lower sliding rod that are sleeved together and can slide axially. The upper sliding rod is connected to the top frame, and the lower sliding rod is connected to the base frame.

[0010] As a further improvement of this utility model: the first elastic element and the second elastic element are springs.

[0011] As a further improvement of this utility model, the included angle between the axis of the tapered hole and the bottom surface is 60°.

[0012] As a further improvement of this utility model: the plug-in block is made of insulating material, and the limiting plate is made of metal material.

[0013] As a further improvement of this utility model, an injection channel communicating with an external injection system is provided on the side wall of the first limiting frame.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model achieves high precision through a lower mold mechanism with a 60° tapered positioning hole. This angle strikes the optimal balance between guidance and stability: too small an angle results in a short guiding stroke and poor performance; too large an angle can easily cause jamming. This ensures that the PIN pin is precisely guided to the correct position, reducing the risk of product damage.

[0015] 2. By setting up an upper mold mechanism and using a multi-point guiding system consisting of a first limiting post and two sets of sliding rods, this utility model completely eliminates the risk of deflection of the clamping block, ensuring that the pressure is completely vertically downward when the mold is closed. The first elastic element provides macroscopic, large-stroke floating buffer, while the clamping block made of elastic material provides microscopic, surface-contact flexible buffer. Together with the lower mold mechanism, it achieves double buffering and avoids damage to the PIN pin. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the mounting bracket of this utility model; Figure 3 This is a schematic diagram of the upper mold mechanism of this utility model; Figure 4 For the present utility model Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the lower mold mechanism of this utility model; Figure 6 For the present utility model Figure 5 Enlarged view of point A in the middle; Figure 7 This is a schematic diagram of the limiting plate of this utility model.

[0017] Attached drawing references: 1. Base frame; 2. Top frame; 3. Guide mechanism; 4. Upper mold mechanism; 5. Mounting shell; 6. Lower mold mechanism; 31. Upper slide bar; 32. Lower slide bar; 41. Pull-out box; 42. First limiting frame; 43. Limiting shell; 44. Sliding rod; 45. Pressing block; 46. First limiting post; 47. First spring; 48. First fixing rod; 61. Second limiting frame; 62. Insertion block; 63. Limiting plate; 64. Connecting post; 65. Second limiting post; 66. Second spring; 67. Second fixing rod. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] In one embodiment, such as Figures 1-7 As shown, a PIN needle overmolding mold includes a base frame 1 and a top frame 2 disposed opposite to the base frame 1. The top frame 2 and the base frame 1 are connected by at least one set of guide mechanisms 3. An upper mold mechanism 4 is disposed at the bottom of the top frame 2, and a mounting shell 5 is disposed at the top of the base frame 1. Multiple sets of lower mold mechanisms 6 are arrayed inside the mounting shell 5. In this embodiment, multiple PIN pins are inserted into the insertion holes of the insertion block 62 of the lower mold mechanism 6. Under the action of external power, the top frame 2 moves downward along the guide mechanism 3, driving the entire upper mold mechanism 4 closer to the lower mold. When the clamping block 45 of the upper mold mechanism 4 and the insertion block 62 of the lower mold mechanism 6 are completely fitted together, a sealed cavity is formed between them. The part of the PIN pin that needs to be coated is located in this cavity. Molten plastic is injected into this cavity through the injection channel, filling and wrapping the PIN pin. The plastic is held under pressure, cooled and solidified in the cavity to form the final coated product. After injection molding is completed, the top frame 2 drives the upper mold mechanism 4 to move upward and separate from the lower mold.

[0020] In one embodiment, such as Figure 3 and Figure 4 As shown, the upper mold mechanism 4 includes a first limiting post 46 fixedly installed on the top frame 2. A clamping block 45 is elastically connected to the bottom of the first limiting post 46 via a first elastic element, which is installed on the inner wall of the first limiting frame 42. The first limiting post 46 slides on the inner wall of the first limiting frame 42. The top of the clamping block 45 also has two sets of sliding rods 44 that pass through and are slidably connected to the top frame 2. The clamping block 45 is also covered by a limiting shell 43, which has multiple sets and is installed inside a pull-out box 41. The pull-out box 41 is slidably connected to the top frame 2. The clamping block 45 is made of elastic material. The clamping block 45 is connected to the fixed first limiting post 46 via the first elastic element. This constitutes the most basic and important floating mechanism. When encountering uneven pin heights during mold closing, the clamping block 45 can compress the spring and retract upwards, adaptively ensuring uniform pressure on each pin and avoiding rigid impact. The top of the clamping block 45 is also equipped with two sets of sliding rods 44, which directly pass through and slide with the top frame 2 to provide a guiding function. The clamping block 45 itself is made of elastic material (such as silicone or polyurethane). The elastic clamping block 45 itself can also provide a more evenly distributed contact buffer, which can better adapt to the micro-unevenness of the pin tip and ensure a perfect seal. When a clamping block 45 needs to be replaced, cleaned, or repaired, the operator does not need to disassemble the entire upper mold. He can simply slide the corresponding pull-out box 41 out of the top frame 2 like pulling out a drawer for maintenance.

[0021] In one embodiment, such as Figure 5 , Figure 6 and Figure 7As shown, the lower mold mechanism 6 includes a second limiting frame 61, a plug-in block 62, the plug-in block 62 being housed within the first limiting frame 42, the plug-in block 62 having multiple sets of plug-in holes for inserting PIN pins, a limiting plate 63 located at the bottom of the plug-in block 62, having multiple sets of positioning holes corresponding to the plug-in holes; a connecting post 64 fixedly installed at the bottom of the limiting plate 63; a second limiting post 65 fixedly mounted on the base frame 1; and a second fixing rod 67 elastically connected to the second limiting post 65 via a second elastic element, the upper end of the second fixing rod 67 being fixedly connected to the limiting plate 63, the positioning hole being a tapered hole with a larger upper diameter and a smaller lower diameter, the angle between the axis of the tapered hole and the bottom surface being 60°, the plug-in block 62 being made of insulating material, and the limiting plate 63 being made of metal material; the operator or automated equipment inserts multiple PIN pins sequentially into the plug-in holes of the plug-in block 62. The pin passes through the insert block 62, and its lower end continues downward through the positioning hole on the limiting plate 63. When the lower end of the pin passes through, the tapered surface guides the pin to fine-tune its position and automatically center it. During mold closing and injection molding, the entire lower mold mechanism 6 needs to withstand the pressure from the upper mold and the filling pressure of the injection. At this time, the connecting column 64, the second fixing rod 67, and the compressed second elastic element ensure that the insert block 62 and the limiting plate 63 will not be displaced or deformed under pressure, thus ensuring the dimensional stability of the molding cavity. After injection molding is completed and the upper mold is lifted, the demolding process begins. Previously, under the mold closing pressure, the second elastic element was in a compressed state. When the mold closing pressure is released, the restoring force of the second elastic element is released, pushing the second fixing rod 67 upward for better demolding.

[0022] In one embodiment, such as Figure 2 As shown, the guide mechanism 3 is a telescopic rod, which includes an upper sliding rod 31 and a lower sliding rod 32 that are sleeved together and can slide axially. The upper sliding rod 31 is connected to the top frame 2, and the lower sliding rod 32 is connected to the base frame 1. When the drive mechanism (such as the hydraulic cylinder of an injection molding machine) pushes the top frame 2 downward, the top frame 2 drives the upper sliding rod 31 to move downward. Since the upper sliding rod 31 is sleeved on the outside of the lower sliding rod 32, it slides smoothly downward along the outer wall of the lower sliding rod 32 until the mold is completely closed.

[0023] In one embodiment, such as Figure 4 and Figure 6 As shown, the first and second elastic elements are springs; using springs can keep up with the rapid opening and closing cycle of the mold, and complete the clamping and ejection actions in a timely manner.

[0024] In one embodiment, such as Figure 1As shown, the side wall of the first limiting frame 42 has an injection channel that communicates with an external injection system. One end of the channel is connected to the external injection system, and the other end leads to a closed cavity formed by the clamping block 45 of the upper mold and the insertion block 62 of the lower mold after mold closing. Under high pressure, the external injection molding machine injects molten plastic into these cavities through the injection channel. The plastic quickly fills the entire cavity, covering the specific part of the PIN needle. The injection molding machine maintains pressure to compensate for the volume of plastic shrinkage due to cooling, ensuring that the product is dense and defect-free.

[0025] The above embodiments disclose a PIN pin overmolding mold, wherein an operator or automated equipment sequentially inserts a large number of PIN pins into the lower mold mechanism 6. Each pin passes through the insertion hole on the insertion block 62 and continues downward, passing through the corresponding 60° conical positioning hole on the limiting plate 63. This hole can automatically guide and correct the pin, ensuring that it is finally in a vertical and precise position. The external injection molding machine drives the top frame 2, making it move downward smoothly and precisely along the telescopic rod guide mechanism 3. The upper mold mechanism 4 presses down with the top frame 2, and its clamping block 45 begins to contact the top of the pin. Due to the slight tolerance in the height of the pin, the clamping block 45 will float by compressing the first spring 47. At the same time, the first limiting post 46 and the sliding rod 44 ensure that it will not tilt, ensuring that all pins are evenly clamped without damage. When the clamping block 45 is fully attached to the insertion block 62, one or more sealed cavities are formed around the pins that need to be coated. Under high pressure, the injection molding machine injects molten plastic through the injection channel opened on the side wall of the first limiting frame 42 to fill all cavities.

[0026] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An encapsulation mold for a PIN, comprising a base frame (1) and a top frame (2) disposed opposite to the base frame (1), characterized in that, The top frame (2) and the bottom frame (1) are connected by at least one set of guide mechanisms (3). The bottom of the top frame (2) is provided with an upper mold mechanism (4), and the top of the bottom frame (1) is provided with a mounting shell (5). Multiple sets of lower mold mechanisms (6) are arrayed inside the mounting shell (5). The upper mold mechanism (4) includes a first limiting post (46) fixedly installed on the top frame (2), a pressing block (45) elastically connected to the bottom of the first limiting post (46) through a first elastic element, and the first elastic element is installed on the inner wall of the first limiting frame (42). The first limiting post (46) slides on the inner wall of the first limiting frame (42), and the top of the pressing block (45) is also provided with two sets of sliding rods (44) that pass through the top frame (2) and are slidably connected to it. The pressing block (45) is also covered with a limiting shell (43). Multiple sets of the limiting shell (43) are provided and installed in the pull-out box (41). The pull-out box (41) is slidably connected to the top frame (2). The lower mold mechanism (6) includes a second limiting frame (61) and a plug block (62). The plug block (62) is housed in the first limiting frame (42). The plug block (62) is provided with multiple sets of plug holes for inserting PIN pins. A limiting plate (63) is provided at the bottom of the plug block (62) and is provided with multiple sets of positioning holes corresponding to the plug holes. The connecting column (64) is fixedly installed at the bottom of the limiting plate (63); The second limiting post (65) is fixed on the base frame (1); The second fixing rod (67) is elastically connected to the second limiting post (65) through the second elastic element, and the upper end of the second fixing rod (67) is fixedly connected to the limiting plate (63).

2. The encapsulation mold for a PIN needle according to claim 1, wherein The positioning hole is a tapered hole that is larger at the top and smaller at the bottom.

3. The encapsulation mold for a PIN needle according to claim 1, wherein The clamping block (45) is made of an elastic material.

4. The encapsulation mold for a PIN needle according to claim 1, wherein The guide mechanism (3) is a telescopic rod, which includes an upper sliding rod (31) and a lower sliding rod (32) that are sleeved together and can slide axially. The upper sliding rod (31) is connected to the top frame (2), and the lower sliding rod (32) is connected to the base frame (1).

5. The encapsulation mold for a PIN needle according to claim 1, wherein The first elastic element and the second elastic element are springs.

6. The encapsulation mold for a PIN needle according to claim 2, wherein The angle between the axis of the tapered hole and the bottom surface is 60°.

7. The encapsulation mold for a PIN needle according to claim 1, wherein The plug-in block (62) is made of insulating material, and the limiting plate (63) is made of metal material.

8. The encapsulation mold for a PIN needle according to claim 1, wherein The first limiting frame (42) has an injection channel on its side wall that communicates with an external injection system.

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