A thimble structure for producing an inner-groove silver contact

Abstract

The utility model discloses a kind of ejector pin structures of production inner recess silver contact, it is related to silver contact processing technical field, to solve the problem of the overall replacement after traditional integrated forming ejector pin wear, cause resource waste. The structure includes mutually independent upper needle bar, lower needle bar and needle head, and upper and lower needle bar are detachably connected by first set (threaded hole and threaded column) or second set (limiting hole and convex column);Lower needle bar is provided with reserved passage, needle head is inserted in passage, and after upper and lower needle bar are connected, set and needle head are abutted to constrain its position. Needle head top end is equipped with needle disc, and bottom can be equipped with convex block. This structure only needs to replace worn needle, without replacing intact needle bar, reduce consumable cost, and disassembly and assembly are convenient, guarantee processing efficiency, applicable to inner recess silver contact processing.

Description

Technical Field

[0001] This utility model relates to the field of silver contact processing technology, and in particular to a pin structure for producing grooved silver contacts. Background Technology

[0002] In the field of silver contact machining technology, the ejector pin is the core component for forming the inner groove of the silver contact, and its structural design directly affects machining accuracy, operating efficiency, and production costs. Currently, the ejector pins widely used in the industry for silver contact machining generally adopt a one-piece molding structure, that is, the pin shank and the pin head are an inseparable whole.

[0003] In actual processing, the needle tip of this type of one-piece molded ejector pin needs to directly contact the silver contact blank and withstand the extrusion force. As the processing time increases, the needle tip will gradually wear down due to continuous friction and stress. When the needle tip wears down to the point that it can no longer guarantee the processing accuracy of the inner groove (such as groove size deviation, excessive surface roughness) or cannot be formed normally, the entire ejector pin needs to be stopped and replaced.

[0004] However, in scenarios where ejector pins are scrapped and replaced, the pin shank is usually not significantly damaged and still possesses the structural strength and precision required for normal use. However, due to its unibody design, the pin shank cannot be separated from the worn pin and must be discarded along with it. This replacement method wastes undamaged pin shank resources, significantly increasing the consumable costs of silver contact machining. Especially in mass production scenarios, frequent replacement of the entire ejector pin further amplifies resource waste and production cost pressures, failing to meet the demands of efficient and economical machining and production. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model proposes a pin structure for producing grooved silver contacts.

[0006] This utility model proposes a pin structure for producing grooved silver contacts, including an upper pin bar and a lower pin bar that are independent of each other. The upper pin bar and the lower pin bar are connected by a first kit or a second kit. A reserved channel is opened through the interior of the lower pin bar, and a needle is inserted into the reserved channel. After the upper pin bar and the lower pin bar are connected, the first kit or the second kit abuts against the needle.

[0007] Furthermore, the first kit includes a threaded post connected to the bottom end of the upper needle bar, and a threaded hole opened inside the lower needle bar and connected to a reserved channel, wherein the threaded post is connected to the threaded hole.

[0008] Furthermore, the second channel includes a protrusion connected to the bottom end of the upper needle bar, and a limiting hole opened inside the lower needle bar and connected to the reserved channel.

[0009] Furthermore, an inner pin hole is formed through the interior of the protruding post, and outer pin holes connected to the limiting hole are formed on both sides of the lower needle rod. The inner pin hole and the outer pin hole correspond to each other, and the inner pin hole and the outer pin hole are connected together by a fastening bolt.

[0010] Furthermore, a limiting groove is formed on the outer surface of the lower needle rod, and a nut is fixed inside the limiting groove. The fastening bolt is connected to the nut.

[0011] Furthermore, the tip of the needle is connected to a needle plate, which is located inside a threaded hole or a limiting hole, and the needle plate abuts against a threaded post or a protruding post to constrain the vertical position of the needle within the reserved channel.

[0012] Furthermore, protrusions are connected to both sides of the bottom of the needle.

[0013] The beneficial effects of this utility model are as follows: By designing the ejector pin structure as an independent upper needle rod, a lower needle rod, and a needle that can be inserted into the reserved channel of the lower needle rod, and by using a first kit or a second kit to achieve a detachable connection between the upper and lower needle rods, the structural limitations of traditional one-piece molded ejector pins are broken. When the ejector pin wears out due to long-term processing, it is only necessary to disassemble the connecting kit of the upper and lower needle rods and replace the worn needle. There is no need to replace the undamaged upper and lower needle rods as a whole, which effectively avoids unnecessary waste of needle rod resources and significantly reduces the consumable cost in the silver contact processing process. At the same time, the kit-type connection design also facilitates quick disassembly and replacement of needles, ensuring the continuity and efficiency of processing operations. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the disassembled structure of Embodiment 1 of this utility model; Figure 2 This is a half-sectional view of Embodiment 1 of this utility model after assembly; Figure 3 This is a schematic diagram of the disassembled structure of Embodiment 2 of this utility model; Figure 4 This is a half-sectional view of the assembled embodiment 2 of this utility model; Figure 5 This is a schematic diagram of the structure of the needle tip with protrusions in this utility model.

[0015] In the diagram: 1. Upper needle bar; 2. Lower needle bar; 3. Needle; 31. Needle plate; 32. Protrusion; 4. Threaded post; 5. Threaded hole; 6. Protrusion; 61. Inner pin hole; 7. Limiting hole; 71. Outer pin hole; 72. Limiting groove; 8. Nut; 9. Fastening bolt; 10. Silver contact; 101. Groove. Detailed Implementation Example 1

[0016] Reference Figure 1-2The present invention proposes a pin structure for producing grooved silver contacts, comprising an upper pin rod 1, a lower pin rod 2, and a cylindrical needle 3, which are independent of each other. The upper pin rod 1 and the lower pin rod 2 are connected by a first assembly. Specifically, the first assembly consists of a threaded post 4 fixed at the bottom of the upper pin rod 1 and a threaded hole 5 opened inside the lower pin rod 2. The threaded hole 5 is connected to a reserved channel through the lower pin rod 2, providing space for the installation of the needle 3. During assembly, first align the bottom end of the cylindrical needle 3 with the reserved channel of the lower needle rod 2, and insert the needle 3 into the channel until the needle plate 31 is completely inside the threaded hole 5; then align the threaded post 4 at the bottom end of the upper needle rod 1 with the threaded hole 5, and rotate the upper needle rod 1 to make the threaded post 4 and the threaded hole 5 threadedly connected until the bottom end of the threaded post 4 is tightly abutted against the needle plate 31. At this time, the vertical position of the needle 3 in the reserved channel is completely constrained and cannot move up and down, ensuring the positional accuracy during processing. After the ejector pin structure is assembled, install it at the corresponding station of the silver contact processing equipment. During processing, the equipment drives the ejector pin structure to move towards the part of the silver contact 10 to be processed. The bottom end of the cylindrical needle 3 contacts the surface of the silver contact 10 and squeezes the silver contact 10 under the pressure of the equipment. Since the needle 3 is cylindrical and the cooperation between the needle plate 31 and the threaded column 4 ensures the stable feeding of the needle 3, a columnar groove is finally formed inside the silver contact 10. Example 2

[0017] Reference Figure 3-4 This utility model proposes a pin structure for producing grooved silver contacts, including an upper pin rod 1, a lower pin rod 2, and a cylindrical needle head 3, which are independent of each other. The upper pin rod 1 and the lower pin rod 2 are connected by a second assembly. Specifically, the second assembly includes a protruding post 6 integrally formed at the bottom end of the upper pin rod 1 and a limiting hole 7 opened inside the lower pin rod 2. The limiting hole 7 is also connected to the reserved channel of the lower pin rod 2. An inner pin hole 61 is opened through the protruding post 6. The lower pin rod 2 has outer pin holes 71 on both sides that are connected to the limiting hole 7. The inner pin hole 61 and the outer pin hole 71 have the same diameter. At the same time, a limiting groove 72 is opened on the outer surface of the lower pin rod 2 at the position corresponding to the outer pin hole 71. A nut 8 that is compatible with the fastening bolt 9 is fixed in the groove. During assembly, first insert the bottom end of the cylindrical needle 3 into the reserved channel of the lower needle rod 2, then insert the protrusion 6 of the upper needle rod 1 into the limiting hole 7 until the bottom end of the protrusion 6 abuts against the needle plate 31. At this time, the inner pin hole 61 of the protrusion 6 is completely aligned with the outer pin hole 71 of the lower needle rod 2. Finally, pass the fastening bolt 9 through the outer pin hole 71 and the inner pin hole 61, and thread it with the nut 8 in the limiting groove 72. By tightening the fastening bolt 9, the protrusion 6 and the lower needle rod 2 are fixed. At the same time, the needle plate 31 is pressed by the protrusion 6 to ensure the stability of the needle 3 in the reserved channel. After installation, the ejector pin structure can be adapted to the same processing equipment as in Example 1. During processing, the cylindrical needle 3 contacts and presses against the silver contact 10 under the drive of the equipment. Since the second kit achieves rigid fixation of the upper and lower needle rods through bolt connection, there is no offset during the feeding process of the needle 3. The inner groove 101 of the silver contact 10 that is finally processed is also cylindrical, and the dimensional accuracy is comparable to that of Example 1. Example 3

[0018] Reference Figure 5 The present invention proposes a pin structure for producing grooved silver contacts. The difference between this structure and embodiments 1 and 2 is that: protrusions 32 are symmetrically connected on both sides of the bottom of the pin 3. When processing the silver contact 10, the cylindrical body of the pin 3 is squeezed to form the main cavity of the groove, and the protrusions 32 on both sides are squeezed to form symmetrical concave structures on both sides of the inner wall of the main cavity. Finally, a special groove 101 with side concavity is processed on the silver contact 10, instead of the cylindrical groove of embodiments 1 and 2. This recessed groove 101 with side indentation increases the connection area between the silver contact and other components, improves the stability after connection, optimizes the current conduction path, and reduces contact resistance. It is suitable for the processing of silver contacts in core components such as relays and circuit breakers in electrical equipment with high current and high stability requirements.

[0019] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pin structure for producing grooved silver contacts, characterized in that, It includes an independent upper needle bar (1), a lower needle bar (2), and a second channel. The upper needle bar (1) and the lower needle bar (2) are connected by a first kit or a second kit. A reserved channel is opened through the interior of the lower needle bar (2), and a needle (3) is inserted in the reserved channel. After the upper needle bar (1) and the lower needle bar (2) are connected, the first kit or the second kit abuts against the needle (3).

2. The ejector pin structure for producing grooved silver contacts according to claim 1, characterized in that, The first kit includes a threaded post (4) connected to the bottom end of the upper needle bar (1) and a threaded hole (5) opened inside the lower needle bar (2) and connected to a reserved channel. The threaded post (4) is connected to the threaded hole (5).

3. The ejector pin structure for producing grooved silver contacts according to claim 1, characterized in that, The second channel includes a protrusion (6) connected to the bottom end of the upper needle bar (1) and a limiting hole (7) opened inside the lower needle bar (2) and connected to the reserved channel.

4. The ejector pin structure for producing grooved silver contacts according to claim 3, characterized in that, The protruding post (6) has an inner pin hole (61) through it, and the lower needle rod (2) has outer pin holes (71) on both sides that are connected to the limiting hole (7). The inner pin hole (61) and the outer pin hole (71) are corresponding to each other, and the inner pin hole (61) and the outer pin hole (71) are connected together by a fastening bolt (9).

5. The ejector pin structure for producing grooved silver contacts according to claim 4, characterized in that, A limiting groove (72) is provided on the outer surface of the lower needle rod (2), and a nut (8) is fixed inside the limiting groove (72). The fastening bolt (9) is connected to the nut (8).

6. The ejector pin structure for producing grooved silver contacts according to any one of claims 1-5, characterized in that, The top of the needle (3) is connected to the needle plate (31), which is located inside the threaded hole (5) or the limiting hole (7), and the needle plate (31) abuts against the threaded post (4) or the protruding post (6) to constrain the vertical position of the needle (3) in the reserved channel.

7. The ejector pin structure for producing grooved silver contacts according to claim 1, characterized in that, Both sides of the bottom of the needle (3) are connected to protrusions (32).

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