A finger assembly

Abstract

The utility model discloses a kind of contact finger assemblies, it is related to plum blossom contact technical field, to solve the problem that the outer wall and contact patch contact part are linear contact due to the cylindrical conductive column in prior art, the area is smaller, affect the conductivity, and it is easy to cause local overheating or arc damage due to poor contact. Multiple contact patches are arranged in an annular array on the outer side of the circular connecting plate and the annular grid plate, multiple trapezoidal extension plates are fixedly connected to the inner middle part of the contact patches between the circular connecting plate and the annular grid plate, each trapezoidal extension plate is connected to an arc-shaped lamination plate on the inner side, and annular tension springs are arranged at the two ends of the front and rear middle part of the outer side of the multiple contact patches. By setting the arc-shaped lamination plate and the inclined guide plate, the conductive column can be automatically guided and positioned when inserted, and a large-area surface contact is formed with the arc-shaped lamination plate, significantly improving the conductive contact area.

Description

Technical Field

[0001] This utility model relates to the field of plum blossom contact technology, specifically a contact finger assembly. Background Technology

[0002] The plum blossom contact is a key conductive component used in high-voltage electrical equipment, primarily in the primary conductive systems of high-voltage vacuum circuit breakers, switchgear, and handcarts. It consists of multiple trapezoidal contact fingers arranged in a ring, resembling a plum blossom, hence its name. The contact fingers are typically made of T2 copper plate, precision-stamped, and thickly silver-plated to improve conductivity and wear resistance, and undergo anti-discoloration treatment to extend service life. The structural features of the plum blossom contact include a non-magnetic stainless steel annular tension spring binding.

[0003] For example, patent announcement number CN213401070U discloses a plum blossom contact for high-voltage switchgear, which includes a grid, contact pieces, and a spring. Two grids are provided and parallel to each other, both grids being annular. Several fixing grooves are formed on the outer circumference of each of the two grids. Several grids are provided and correspondingly positioned within the fixing grooves of the two grids. The spring is wound around the outer side of several contact pieces along the axis of the grids. An operating rod is provided between the two grids, and the operating rod is detachably connected to each of the two grids. An operating block is provided on the side of the operating rod facing the grid. The grid has an operating hole for the operating block to pass through, and the operating block has a limiting element to restrict the movement of the grid. This application has the effect of improving the success rate of plum blossom contact assembly.

[0004] In the aforementioned technology, when the plum blossom contact is used, the conductive post is inserted into the middle of the contact piece of the ring array and makes contact with the contact piece to achieve electrical connection. However, since the conductive post is cylindrical, the contact area between its outer wall and the contact piece is linear, resulting in a small contact area, which affects the conductivity and is prone to local overheating or arc damage due to poor contact. Therefore, the market urgently needs to develop a contact finger assembly to help people solve the existing problems. Utility Model Content

[0005] The purpose of this utility model is to provide a touch finger assembly to solve the problems mentioned in the background art, which are caused by the cylindrical shape of the conductive post, resulting in a linear contact between its outer wall and the contact piece, a small contact area, affecting conductivity, and easy to cause local overheating or arc damage due to poor contact.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a touch finger assembly, comprising a circular connecting piece, an annular grid piece disposed at the rear end of the circular connecting piece, the circular connecting piece and the annular grid piece being connected by a plurality of connecting rods, a plurality of touch pieces being arranged in an annular array on the outer sides of the circular connecting piece and the annular grid piece, a trapezoidal extension piece being fixedly connected to the inner middle of the plurality of touch pieces and between the circular connecting piece and the annular grid piece, an arc-shaped fitting piece being connected to the inner side of each trapezoidal extension piece, and an annular tension spring being disposed at both ends of the outer middle of the plurality of touch pieces.

[0007] Preferably, the rear ends of the plurality of connecting rods are fixedly connected to the front end face of the annular grid plate, and the front ends of the plurality of connecting rods are fixedly connected to the circular connecting plate by a first screw.

[0008] Preferably, the outer end face of the circular connecting piece is provided with a plurality of first limiting slots in an annular array, and the outer end face of the annular grid piece is provided with a plurality of second limiting slots in an annular array, with the front and rear ends of the plurality of contact pieces respectively inserted into the plurality of first limiting slots and the plurality of second limiting slots.

[0009] Preferably, each of the contact pieces has a limit block fixedly connected to both ends of the circular connecting piece and the rear end of the annular grid piece.

[0010] Preferably, each of the arc-shaped bonding pieces has a U-shaped connecting strip fixedly connected to its outer end face, and the lower end of the trapezoidal extension piece is inserted into the U-shaped connecting strip and fixedly connected by multiple second screws.

[0011] Preferably, each of the arc-shaped bonding pieces has an oblique guide piece fixedly connected to its rear end.

[0012] Preferably, each of the outer end faces of the contact piece is provided with a U-shaped groove at both the front and rear ends of the middle portion, and the inner sides of the two annular tension springs are respectively inserted into the two U-shaped grooves on the outer end faces of the multiple contact pieces.

[0013] Compared with the prior art, the beneficial effects of this utility model are: (1) In this utility model, by setting an arc-shaped bonding piece and an oblique guide piece, the conductive post can be automatically guided and positioned when inserted, and form a large area of ​​contact with the arc-shaped bonding piece, which significantly improves the conductive contact area, reduces the contact resistance, and effectively improves the conductivity.

[0014] (2) In this utility model, a double ring tension spring structure is adopted so that multiple contact pieces can apply radial pressure evenly, ensuring that the arc-shaped bonding piece is tightly bonded to the outer wall of the conductive column, avoiding local overheating or arc damage caused by poor contact, and improving the reliability and safety of the equipment.

[0015] (3) In this utility model, the arc-shaped bonding piece is fixed by a U-shaped connecting strip and screws, which is convenient for disassembly and replacement. At the same time, the design of the limiting block and the U-shaped groove ensures the stability of the contact piece movement. The overall structure is simple and reliable, easy to maintain, and extends the service life. Attached Figure Description

[0016] Figure 1 This is a front view of a finger-touch component according to the present invention; Figure 2 This is a main sectional view of the arc-shaped bonding sheet of this utility model; Figure 3 This is a side sectional view of the contact piece of this utility model; Figure 4 This is a detailed enlarged view of part A of this utility model.

[0017] In the diagram: 1. Circular connecting piece; 101. First limiting slot; 2. Annular grid piece; 201. Second limiting slot; 202. Connecting rod; 203. First screw; 3. Contact piece; 301. U-shaped groove; 302. Trapezoidal extension piece; 303. Limiting block; 4. Arc-shaped fitting piece; 401. U-shaped connecting strip; 402. Second screw; 403. Angled guide piece; 5. Annular tension spring. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Please see Figure 1-4This utility model provides an embodiment of a touch finger assembly, including a circular connecting piece 1, an annular grid piece 2 disposed at the rear end of the circular connecting piece 1, the circular connecting piece 1 and the annular grid piece 2 being connected by a plurality of connecting rods 202, the rear ends of the plurality of connecting rods 202 being fixedly connected to the front end face of the annular grid piece 2, and the front ends of the plurality of connecting rods being fixedly connected to the circular connecting piece 1 by a first screw 203, thereby fixing the circular connecting piece 1 and the annular grid piece 2 together. A plurality of touch pieces 3 are arranged in an annular array on the outer side of the circular connecting piece 1 and the annular grid piece 2, and a plurality of touch pieces 3 are arranged in an annular array on the outer end face of the circular connecting piece 1. A limiting slot 101 is provided. Multiple second limiting slots 201 are arranged in a circular array on the outer end face of the annular grid plate 2. Multiple contact pieces 3 are inserted into the multiple first limiting slots 101 and multiple second limiting slots 201 at their front and rear ends respectively, allowing the multiple contact pieces 3 to move radially outwards. Limiting blocks 303 are fixedly connected to both end faces of each contact piece 3, as well as to the front end face of the circular connecting piece 1 and the rear end face of the annular grid plate 2. The limiting blocks 303 at both ends of the contact piece 3 respectively abut against the front end face of the circular connecting piece 1 and the rear end face of the annular grid plate 2, restricting the longitudinal movement of the contact piece 3 and ensuring the stability of the radial movement of the contact piece 3. Please see Figure 2 and Figure 3 Multiple contact pieces 3 have trapezoidal extension pieces 302 fixedly connected to their inner center and between the circular connecting piece 1 and the annular grid piece 2. Each trapezoidal extension piece 302 has an arc-shaped fitting piece 4 connected to its inner side, and each arc-shaped fitting piece 4 has an oblique guide piece 403 fixedly connected to its rear end. Multiple contact pieces 3 have annular tension springs 5 ​​at both ends of their outer center. Each contact piece 3 has a U-shaped groove 301 at both ends of its outer end face. The inner sides of two annular tension springs 5 ​​are respectively inserted into the two U-shaped grooves 301 on the outer end faces of multiple contact pieces 3. When the conductive post is inserted... When the arc-shaped bonding piece 4 of the annular array is inserted into the middle, the front end of the conductive post is first guided by the oblique guide piece 403 of the annular array. When the conductive post is inserted into the arc-shaped bonding piece 4 of the annular array, it will push the arc-shaped bonding piece 4 and its connected contact piece 3 to move radially outward and stretch the annular tension spring 5. The two annular tension springs 5 ​​simultaneously apply radial pressure to multiple contact pieces 3, so that the contact pieces 3 press the arc-shaped bonding piece 4 down onto the outer wall of the conductive post. The arc-shaped bonding piece 4 achieves elastic deformation through the downward pressure to achieve large-area bonding with the outer wall of the conductive post, thereby improving the conductivity.

[0020] Please see Figure 2 and Figure 4 Each arc-shaped bonding piece 4 has a U-shaped connecting strip 401 fixedly connected to its outer end face. The lower end of the trapezoidal extension piece 302 is inserted into the U-shaped connecting strip 401 and fixedly connected by multiple second screws 402, so that the arc-shaped bonding piece 4 is fixedly connected to the trapezoidal extension piece 302 and the contact piece 3, and is easy to disassemble.

[0021] Working Principle: During use, when the conductive post is inserted into the contact finger assembly, the front end of the conductive post is first guided and positioned by the oblique guide plates 403 in a ring array. As the conductive post continues to be inserted, its outer wall contacts multiple arc-shaped contact plates 4 and applies radial pressure, pushing each contact plate 3 to move radially outward against the elastic force of the ring tension springs 5. During this process, the two ring tension springs 5 ​​simultaneously apply a uniform radial restoring force to the multiple contact plates 3, so that the arc-shaped contact plates 4 are pressed tightly against the outer wall of the conductive post with appropriate pressure. Due to the elastic deformation characteristics of the arc-shaped contact plates 4, they will deform under pressure, causing their inner arc surface to form a surface contact with the outer wall of the conductive post rather than a line contact, thereby significantly increasing the effective contact area. This design not only improves conductivity but also avoids local overheating or arc damage through uniform pressure distribution. When disassembly is required, the arc-shaped contact plates 4 can be replaced by loosening the second screw 402, making maintenance convenient. Throughout the entire operation, the limiting block 303 and the U-shaped groove 301 structure ensure the stable radial movement of the contact piece 3, while the trapezoidal extension piece 302 provides reliable structural support.

[0022] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A finger-operated assembly, comprising a circular connecting piece (1), characterized in that: The circular connecting piece (1) is provided with an annular grid piece (2) at its rear end. The circular connecting piece (1) and the annular grid piece (2) are connected by multiple connecting rods (202). Multiple contact pieces (3) are arranged in annular array on the outer side of the circular connecting piece (1) and the annular grid piece (2). Trapezoidal extension pieces (302) are fixedly connected to the middle inner side of the multiple contact pieces (3) and between the circular connecting piece (1) and the annular grid piece (2). An arc-shaped fitting piece (4) is connected to the inner side of each trapezoidal extension piece (302). An annular tension spring (5) is provided at both ends of the middle outer side of the multiple contact pieces (3).

2. A finger-touch assembly according to claim 1, characterized in that: The rear ends of the multiple connecting rods (202) are fixedly connected to the front end face of the annular grid plate (2), and the front ends of the multiple connecting rods are fixedly connected to the circular connecting plate (1) by the first screw (203).

3. A finger-touch assembly according to claim 1, characterized in that: The outer end face of the circular connecting piece (1) is provided with a ring array of multiple first limiting slots (101), and the outer end face of the ring grid piece (2) is provided with a ring array of multiple second limiting slots (201). The front and rear ends of the multiple contact pieces (3) are respectively inserted into the multiple first limiting slots (101) and the multiple second limiting slots (201).

4. A finger-touch assembly according to claim 1, characterized in that: Each of the contact pieces (3) has a limit block (303) fixedly connected to both ends of the circular connecting piece (1) and the rear end of the annular grid piece (2).

5. A finger-touch assembly according to claim 1, characterized in that: Each of the arc-shaped bonding pieces (4) has a U-shaped connecting strip (401) fixedly connected to its outer end face. The lower end of the trapezoidal extension piece (302) is inserted into the U-shaped connecting strip (401) and fixedly connected by multiple second screws (402).

6. A finger-touch assembly according to claim 1, characterized in that: Each of the arc-shaped bonding pieces (4) has an oblique guide piece (403) fixedly connected to its rear end.

7. A finger-touch assembly according to claim 1, characterized in that: Each of the contact pieces (3) has a U-shaped groove (301) at both ends of the middle of the outer end face. The inner sides of the two annular tension springs (5) are respectively inserted into the two U-shaped grooves (301) on the outer end faces of the multiple contact pieces (3).

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