CN201030409Y

CN201030409Y - Mandrel for coiling plane volute spring

Info

Publication number: CN201030409Y
Application number: CNU200720107943XU
Authority: CN
Inventors: 何黎明
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-03
Filing date: 2007-04-03
Publication date: 2008-03-05
Anticipated expiration: 2017-04-03

Abstract

The utility model designs a core rod of a coiling plane turbination spring which comprises a core rod body. A transition protecting segment is arranged at the end segment of the first circuit of the core rod body, the outer surface of the transition protecting segment is a continuous curve of a coiled curve, and the continuous curve can be equal appearing interval spiral lines or other curves. The end point of the continuous curve is the tangential point which is naturally formed by the start point of the first circuit of the spring and the outer portion of the bended straight line of the spring. The transition protecting segment can be arranged on the core rod body directly, and forms an integral with the core rod body or is movable connected with the core rod body, further a coiled protecting sleeve can be arranged over the core rod body, and the transition protecting segment is arranged on the coiled protecting sleeve, the coiled protecting sleeve is capable of movable rotary fitting with the core rod body, or fixedly fitting with the core rod body. When using the core rod of the coiling plane turbination spring to coil plane turbination springs, the transition protecting segment holds the start segment of the second circuit in the process of spring coiling for arranging the transition protecting segment, thereby the smooth transition between the end segment of the first circuit of the spring and the start segment of the second circuit is ensured.

Description

A kind of plug of coiling plane scroll spring

Technical field

The utility model relates to a kind of process units of plane scroll spring, particularly a kind of plug of coiling plane scroll spring.

Background technology

As a kind of spring of comparatively popularizing, the application scenario of plane scroll spring is very extensive, as: motorcar electric overhead door, backrest spring, clockwork spring etc.The plane scroll spring great majority are to adopt the section bar coiling to form, the production process of existing plane scroll spring is that the flat spring section bar is wound on the plug, because the profile of plane scroll spring is a plane equidistant helix shape, according to the duty of plane scroll spring, whether the transition between the beginning section of the concluding paragraph of the first lap of spring and second section the slick and sly service life and the presentation quality that will directly have influence on spring.The shape of general coiling plug as shown in Figure 1, plane scroll spring with this plug coiling, changeover portion between the beginning section of the concluding paragraph of its first lap and second circle is not a rounding off, but straightway is arranged, and straightway can increase with the increasing of sheet metal thickness.As everyone knows, the stress concentration point of material appears at straight line and arc transition section or circular arc and straight transitions section place usually, and the radius of plane scroll spring inner ring first lap circular arc is a circle of the minimum of whole spring, therefore, during plane scroll spring work, the stress maximum that plane scroll spring inner ring first lap is subjected to, when stress concentration point appears in the inner ring first lap, will cause stress concentration point in advance tired and cause spring breakage, reduce service life, finally makes failure of apparatus.

Summary of the invention

The purpose of this utility model is the changeover portion slyness that provides for the deficiency that solves above-mentioned technology between the beginning section of a kind of concluding paragraph of the first lap that can make spring and second circle, improves the plug of a kind of coiling plane scroll spring in spring service life.

In order to achieve the above object, the plug of a kind of coiling plane scroll spring that the utility model is designed, it comprises mandrel body, concluding paragraph at the first lap of mandrel body is provided with the transition section of protecting, the outer surface of the transition section of protecting is the continuity curve of coiling curve, and the continuity curve can be plane equidistant helix or other curves.The end point of continuity curve is: the point of contact of the starting point of spring first lap and the straightway of the spring outside circular arc that forms naturally after bending.

The transition section of protecting can be directly arranged on the mandrel body, the one-body molded or flexible connection with mandrel body; Also can be that the coiling sheath is set outside mandrel body, the transition section of protecting be located on the coiling sheath, and the coiling sheath cooperates with the movable rotation of mandrel body, also can secure fit.

The plug of the resulting a kind of coiling plane scroll spring of the utility model, when being used for the coiling plane scroll spring, owing to be provided with the transition section of protecting, this transition section of protecting will be held the beginning section of second circle in the spring Coil-up process, guaranteed the concluding paragraph of spring first lap and the transition slyness between the second beginning section of enclosing.

Description of drawings

Fig. 1 is a prior art coiling mandrel structure schematic diagram;

Fig. 2-the 1st, the utility model embodiment 1 structural representation;

Fig. 2-the 2nd, spring Coil-up status architecture schematic diagram;

Fig. 3 is transition section of protecting and the movable connection status schematic diagram of mandrel body;

Fig. 4-the 1st, the mandrel body structural representation of peripheral hardware coiling sheath;

Fig. 4-2 is provided in a side of the outer coiling jacket structure schematic diagram of mandrel body;

Fig. 4-the 3rd, mandrel body peripheral hardware coiling jacket structure schematic diagram.

The specific embodiment

The utility model will be further described in conjunction with the accompanying drawings below by embodiment.

Embodiment 1

Shown in Fig. 2-1, Fig. 2-2, the plug of a kind of coiling plane scroll spring that present embodiment is described, it comprises mandrel body 1, concluding paragraph at the first lap of mandrel body 1 is provided with the transition section of protecting 2, the outer surface of the transition section of protecting 2 is the continuity curve 3 of coiling curve, and continuity curve 3 can be plane equidistant helix or other curves.The end point of continuity curve 3 is: the starting point place 4 of spring first lap locates with the point of contact of straightway 5 outside circular arc 6 that forms naturally after bending of spring 8.The transition section of protecting 2 can be directly arranged on the mandrel body 1, and the transition section of protecting 2 is one-body molded with mandrel body 1.The coiling plug of this form normally is used in manual coiling plane scroll spring.

Embodiment 2:

The plug of a kind of coiling plane scroll spring that present embodiment is described, the concrete form of its described transition section of protecting 2 has various ways, can be as Fig. 3, the transition section of protecting 2 flexibly connects with mandrel body 1, the transition section of protecting 2 relative coiling plugs can move forward and backward, so that in the groove of the convenient insertion of spring sheet material plug.The coiling plug of this form normally is used on automatic or the semiautomatic equipment.

Embodiment 3:

The plug of a kind of coiling plane scroll spring that present embodiment is described, shown in accompanying drawing 4-1, Fig. 4-2, Fig. 4-3, it is that coiling sheath 7 is set outside mandrel body 1, the transition section of protecting 2 is located on the coiling sheath 7, coiling sheath 7 cooperates with mandrel body 1 movable rotation, and the coiling plug of this form normally is used on automatic or the semiautomatic equipment.Be characterized in that the relative coiling plug of coiling sheath can rotate, so that in the groove of the convenient insertion of spring sheet material plug.

Certainly coiling sheath 7 also can with mandrel body 1 secure fit, the form of final duty such as embodiment 1, the just processing and the fixed form difference of the transition section of protecting 2.

Claims

1. the plug of a coiling plane scroll spring, it comprises mandrel body (1), it is characterized in that being provided with the transition section of protecting (2) at the concluding paragraph of the first lap of mandrel body (1), the outer surface of the transition section of protecting (2) is the continuity curve (3) of coiling curve.

2. the plug of a kind of coiling plane scroll spring according to claim 1 is characterized in that described continuity curve (3) is the plane equidistant helix.

3. the plug of a kind of coiling plane scroll spring according to claim 1 and 2 is characterized in that the end point that continues curve (3) is: the starting point place (4) of spring (8) first lap locates with the point of contact of the straightway (5) of spring (8) outside circular arc (6) that forms naturally after bending.

4. the plug of a kind of coiling plane scroll spring according to claim 1 and 2 is characterized in that the transition section of protecting (2) is directly arranged on the mandrel body (1), and is one-body molded with mandrel body (1).

5. the plug of a kind of coiling plane scroll spring according to claim 3 is characterized in that the transition section of protecting (2) is directly arranged on the mandrel body (1), and is one-body molded with mandrel body (1).

6. the plug of a kind of coiling plane scroll spring according to claim 1 and 2 is characterized in that the transition section of protecting (2) is directly arranged on the mandrel body (1), flexibly connects with mandrel body (1).

7. the plug of a kind of coiling plane scroll spring according to claim 3 is characterized in that the transition section of protecting (2) is directly arranged on the mandrel body (1), flexibly connects with mandrel body (1).

8. the plug of a kind of coiling plane scroll spring according to claim 1 and 2 is characterized in that being provided with coiling sheath (7) outside mandrel body (1), the transition section of protecting (2) is located on the coiling sheath (7), and coiling sheath (7) cooperates with the movable rotation of mandrel body (1).

9. the plug of a kind of coiling plane scroll spring according to claim 3 is characterized in that being provided with coiling sheath (7) outside mandrel body (1), the transition section of protecting (2) is located on the coiling sheath (7), and coiling sheath (7) cooperates with the movable rotation of mandrel body (1).

10. the plug of a kind of coiling plane scroll spring according to claim 1 and 2 is characterized in that being provided with coiling sheath (7) outside mandrel body (1), the transition section of protecting (2) is located on the coiling sheath (7), coiling sheath (7) and mandrel body (1) secure fit.