Extension spring structure

Abstract

The utility model relates to an elastic piece, in particular to an extension spring structure, which solves the problem of tension fracture of the end part of a spring. Comprising a spring body and connecting pieces arranged at the two ends of the spring body, the connecting pieces and the spring body are of a split structure, a limiting part and a limiting piece matched with the limiting part in a limiting mode are arranged at the end tail position of the spring body, the connecting pieces and the limiting piece are fixedly assembled, and the limiting part and the limiting piece are clamped and limited in the axial direction of the spring body. The limiting part is of a spiral structure, and the diameter width of the limiting part is gradually reduced towards one side to form a narrow opening. And the limiting part is integrally connected with the spring body. A split type structure is adopted, connection parts are disconnected, connection is stable and reliable in practical application, production difficulty is relatively reduced, production efficiency is improved, and practicability and economical efficiency are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a elastic member, especially a tension spring structure. BACKGROUND

[0002] Tension spring (also called tension spring, simply called tension spring) is a spiral spring bearing axial tension, and the tension spring is generally made of circular cross section material. When not bearing load, the tension spring is generally tight without gap between the coils. The traditional tension spring connecting end is coil or hook shape, and the connecting end and the spring body are integrated structure, and the connecting point of the two is also the main stress position. Since the connecting point is also the curved turning position, it is subjected to axial force for a long time, and has the risk of use fracture. There is a lack of a product which is convenient to process and produce and improves service life, and can meet the use needs of certain scenes. SUMMARY

[0003] In view of the existing technical deficiencies, the utility model provides a tension spring structure.

[0004] In order to realize the above-mentioned purpose, the utility model adopts the technical scheme of: a tension spring structure, including spring body and connecting piece arranged at both ends of the spring body, the connecting piece and the spring body are split type structure, the spring body is provided with limiting part and limiting piece matched with the limiting part at the end position of itself, the connecting piece is fixedly assembled with the limiting piece, and the limiting part and the limiting piece are clamped and limited in the axial direction of the spring body.

[0005] The limiting part is a spiral structure, and the diameter width of the limiting part gradually narrows to form a narrow opening to one side.

[0006] The limiting part and the spring body are integrally connected.

[0007] The connecting piece is hook shape, the connecting piece is provided with connecting part, and the connecting part is fixedly assembled with the limiting piece.

[0008] The limiting piece is a nut or other component which can play a limiting role, and is not limited to a nut, the width of the connecting part is greater than or equal to the inner diameter width of the nut, the limiting piece is sleeved on the connecting piece, and the limiting piece and the connecting part are blocked and limited.

[0009] The connecting part is formed by die casting, and the length direction of the connecting part is consistent with the axial direction of the spring body.

[0010] The connecting piece and the limiting piece are integrated structure.

[0011] The utility model has the advantages that: the tension spring structure provided by the utility model adopts split type structure, adopts disconnected mode for the connecting part, is stable and reliable in actual application, relatively reduces production difficulty, improves production efficiency, and has practicality and economy. Attached Figure Description

[0012] Figure 1 This is an exploded structural diagram of Embodiment 1 of the present invention;

[0013] Figure 2 This is a schematic diagram of the limiting part structure in Embodiment 1 of this utility model;

[0014] Figure 3 This is a schematic diagram of the connector assembly structure of Embodiment 1 of this utility model;

[0015] Figure 4 This is a partial structural diagram of the connector in Embodiment 2 of this utility model. Detailed Implementation

[0016] Example 1: As Figures 1-3 As shown, a tension spring structure includes a spring body 1 and connecting parts 2 disposed at both ends of the spring body 1. The connecting parts 2 and the spring body 1 are separate structures. The spring body 1 has a limiting part 3 and a limiting member 4 at its end. The connecting parts 2 and the limiting members 4 are fixedly assembled, and the limiting part 3 and the limiting member 4 are engaged and limited in the axial direction of the spring body 1. In conventional products, the connecting parts 2 are pull rings or hooks at both ends, and are integrally formed, but in this embodiment, they are separate structures. In the axial direction of the spring body 1, the force dispersion in the non-axial direction is avoided, the stress is relatively concentrated, and the processing difficulty is reduced. Through the blocking and limiting, the upper limit of the tension is closer to the elastic limit of the spring body 1, which is a significant improvement compared to the original single-curve connecting part 6. The limiting member 4 is a nut, or other matching components with a limiting function, which will not be elaborated or limited here.

[0017] The limiting part 3 has a helical structure, and its diameter gradually narrows to one side to form a narrow opening 5. The limiting part 3 is integrally connected to the spring body 1. This processing method allows for continuous production, and the diameter can be adjusted to meet design requirements. It should be noted that the deformation at the narrow opening 5 is small, the number of coils is relatively dense, and the diameter is small, thus providing sufficient resistance to deformation or preventing the limiting part 4 from coming off.

[0018] The connector 2 is hook-shaped and has a connecting portion 6, which is fixedly assembled with the limiting member 4. The hook shape eliminates the need for designing hooks on the equipment or other products, making operation easier. The limiting member 4 can be a nut or other component that provides a limiting function, but is not limited to a nut. The width of the connecting portion 6 is greater than or equal to the inner diameter of the nut. The limiting member 4 is fitted onto the connector 2, and the limiting member 4 and the connecting portion 6 engage and limit the movement. This is one embodiment; nuts can be directly purchased according to required specifications to reduce production costs, or nut-like components can be machined according to actual needs. Further elaboration and limitations are not provided here.

[0019] The connecting part 6 is formed by die casting, and the length direction of the connecting part 6 is consistent with the axis direction of the spring body 1. In this embodiment, the material of the connecting part 2 is from the same source as that of the spring body 1. After preliminary molding, die casting is performed to widen the local width so as to meet the assembly dimensions of the limiting part 4. Generally, the size can be slightly larger, and uniform dimensional accuracy is not required, making the processing simple and reliable.

[0020] Example 2: Different from Example 1, such as Figure 4 As shown, in this embodiment, the connecting member 2 and the limiting member 4 are an integral structure, or they can be formed around the axis, or processed by welding or other methods. The implementation methods are quite diverse, mainly depending on the size of the narrow opening 5 suitable for the spring body 1.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. At the same time, the basic principles, main features, and advantages of this utility model have been shown and described above, which should be understood by those skilled in the art.

Claims

1. A tension spring structure comprising a spring body and a connecting member provided at both ends of the spring body, characterized in that, The connecting piece and the spring body are in a split structure, the spring body is provided with a limiting part and a limiting piece in position at the end of the spring body, the connecting piece and the limiting piece are fixedly assembled, and the limiting part and the limiting piece are clamped and limited in the axial direction of the spring body.

2. A spring structure as claimed in claim 1, characterized in that The limiting part is in a spiral structure, and the diameter of the limiting part gradually narrows to form a narrow opening.

3. A spring structure as claimed in claim 2, wherein The limiting part and the spring body are integrally connected.

4. A spring structure as claimed in claim 1 or 2, characterized in that The connecting piece is in a hook shape, and the connecting piece is provided with a connecting part, and the connecting part and the limiting piece are fixedly assembled.

5. A spring structure as claimed in claim 4, wherein The limiting piece is a nut, the width of the connecting part is greater than or equal to the inner diameter of the nut, the limiting piece is sleeved on the connecting piece, and the limiting piece and the connecting part are blocked and limited.

6. A spring structure as claimed in claim 5, characterised in that The connecting part is formed by die casting, and the length direction of the connecting part is consistent with the axial direction of the spring body.

7. A spring structure as claimed in claim 1 or 2, characterized in that The connecting piece and the limiting piece are in an integral structure.

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