Expansion mandrel

Abstract

The utility model provides an expansion mandrel, and belongs to the technical field of air expansion shafts. Comprising a sliding core shaft, the outer side wall of the sliding core shaft is connected with an expansion block in a sliding mode, the sliding core shaft is made of metal materials, the expansion block is made of metal materials, and a nylon coating is arranged on the outer surface of the sliding core shaft. The sliding core shaft and the expansion block are both made of metal materials, the nylon coating is coated on the outer surface of the sliding core shaft, novel heat treatment is generated, friction is reduced through the nylon coating, the protection design for reducing abrasion is achieved, the service life is effectively prolonged, long-term use of products is facilitated, the sliding core shaft and the expansion block are not prone to damage, and the service life is prolonged. And the comprehensive cost is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model provides a kind of expansion mandrel, belong to gas expansion shaft technical field. BACKGROUND

[0002] Gas expansion shaft is mainly used in film or coiled material industry, is installed on slitting machine and winding machine etc.

[0003] The existing gas expansion shaft basically can meet normal use needs, wherein mechanical gas expansion shaft mainly includes sliding mandrel, expansion block slidably connected with the outer side wall of sliding mandrel, at present, when expansion block is pushed on sliding mandrel, since sliding mandrel and expansion block are all made of metal material, relative abrasion loss is relatively large when metal rubs against metal, which is not conducive to long-term use of product, and parts are easily damaged. Based on this, the utility model provides a kind of expansion mandrel. UTILITY MODEL CONTENT

[0004] The utility model solves technical problems that sliding mandrel and expansion block are all made of metal material, relative abrasion loss is relatively large, which is not conducive to long-term use of product, and parts are easily damaged.

[0005] In order to solve technical problems, the utility model provides technical scheme that a kind of expansion mandrel, including sliding mandrel, expansion block is slidably connected with the outer side wall of sliding mandrel, sliding mandrel is made of metal material, expansion block is made of metal material, the outer surface of sliding mandrel is equipped with nylon coating.

[0006] Further, the outer side wall of sliding mandrel is equipped with wedge-shaped groove that is triangularly distributed and matched with expansion block.

[0007] Further, the center of sliding mandrel is equipped with piston rod through hole.

[0008] The utility model has the advantages of:

[0009] Sliding mandrel is made of metal material, expansion block is made of metal material, a layer of nylon coating is coated on the outer surface of sliding mandrel, new heat treatment is generated, friction is reduced by nylon coating, protection design of reducing abrasion is realized, service life is effectively improved, which is conducive to long-term use of product, and sliding mandrel and expansion block are not easily damaged, so that comprehensive cost is effectively reduced. DRAWING EXPLANATION

[0010] Figure 1 Structure diagram of the utility model a kind of expansion mandrel Figure 1 .

[0011] Figure 2The utility model discloses a structure diagram of expansion tight mandrel Figure 2 .

[0012] Figure 3 The utility model discloses a structure diagram of expansion tight mandrel Figure 3 .

[0013] 1, sliding mandrel;2, expansion block;3, wedge groove;4, through -hole. CONCRETE EMBODIMENT

[0014] In the present specification, the orientation terms such as up, down, left, right, front, back, front face, back face, top, bottom, etc. mentioned or possibly mentioned are defined with respect to its structure, and they are relative concepts. Therefore, it is possible to change accordingly according to its different positions, different use states; therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0015] The singular forms "a", "said" and "the" used in the present specification are intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein means and includes any or all possible combinations of one or more associated listed items.

[0016] In order to make the technical problems, technical solutions and beneficial effects of the present application more clear, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the embodiments described herein are only used to explain the present application and do not limit the present application.

[0017] According to the drawings Figure 1 、 2 , 3: the utility model provides a kind of expansion tight mandrel: including sliding mandrel 1, expansion block 2 is slidably connected in the outer side wall of sliding mandrel 1, the outer side wall of sliding mandrel 1 is equipped with wedge groove 3 being distributed in triangle and being matched with expansion block 2, ensure that expansion block 2 can be pushed along wedge groove 3 along with the movement of sliding mandrel 1, sliding mandrel 1 center is equipped with piston rod through -hole 4, ensure that the piston rod of gas expansion axle can effectively pass through piston rod through -hole 4, avoid interference, for prior art structure, not do much superfluous here, sliding mandrel 1 adopts metal material, expansion block 2 adopts metal material, sliding mandrel 1 outer surface is equipped with nylon coating, can effectively reduce friction.

[0018] The sliding mandrel 1 and the expansion block 2 are made of metal material, and the abrasion loss is relatively large when the metal rubs against the metal, which is not conducive to long-term use of the product, therefore, a layer of nylon coating is coated on the outer surface of the sliding mandrel 1, and a new heat treatment is generated, the nylon coating reduces the friction, the protection design of reducing the abrasion is realized, compared with the traditional sliding mandrel 1 and expansion block 2 made of metal material, the service life is effectively improved, the long-term use of the product is facilitated, the sliding mandrel 1 and the expansion block 2 are not easy to be damaged, and the comprehensive cost is effectively reduced.

[0019] The above describes the utility model and its implementation mode, and this description is not restrictive, and the drawings shown are only one of the implementation modes of the utility model, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired thereby, without departing from the creative purpose of the utility model, similar structural modes and embodiments are not creatively designed, which should belong to the protection scope of the utility model.

Claims

1. An expanding mandrel comprising a sliding mandrel (1) characterised in that: The sliding mandrel (1) is slidably connected with the expansion block (2) on the outer side wall, the sliding mandrel (1) is made of metal material, the expansion block (2) is made of metal material, and the outer surface of the sliding mandrel (1) is provided with a nylon coating.

2. A tension mandrel according to claim 1, wherein: The sliding mandrel (1) is provided with the wedge-shaped groove (3) which is in triangular distribution and matched with the expansion block (2) on the outer side wall.

3. A tension mandrel according to claim 1, wherein: The sliding mandrel (1) is provided with the piston rod through hole (4) in the center.

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