CN212349891U - Hollow ejector pin for perforating machine - Google Patents

Abstract

The utility model relates to a hollow ejector pin for a punching machine, the pin is a tubular structure, two planar structures are arranged at two ends of the pin, the two planar structures at any end and the central axis of the pin are on the same plane and are symmetrical by taking the central axis of the pin as a symmetry axis, and the planar structures at two ends are symmetrical compared with the cross section of the middle position of the pin; the pin outer diameter D1 and the wall thickness S1 satisfy: S1/D1 is more than or equal to 0.20 and less than or equal to 0.4; the radial distance L between the two planar structures at either end of the pin is such that: l is not less than 0.9 and not more than D1 and not more than 0.95 and not more than D1; two through holes with the diameter D2 are formed in the plane structure of the pin along the central axial direction of the pin, and the diameter D2 of each through hole satisfies the following conditions: D2/D1 is more than or equal to 0.20 and less than or equal to 0.5; the utility model discloses a pin is wear-resisting, shock-resistant, resistant extrusion, multiple protection, easy change.

Description

Hollow ejector pin for perforating machine

Technical Field

The utility model belongs to the technical field of hot rolling production seamless steel pipe equipment, especially, relate to a hollow ejector pin for piercing mill.

Background

The hot rolling produces seamless steel pipe, the function of the piercing mill is to roll the solid pipe blank into hollow capillary, the rolling tool used by the piercing mill comprises a mandril, a top, a piercing roller, a guide disc and a guide plate, wherein the mandril is used for supporting the top to realize the main deformation of piercing and has the guide function for rolling the capillary. The ejector rod needs to be fixed on the ejector rod trolley through the ejector rod pin, the ejector rod moves back and forth along with the ejector rod trolley repeatedly when the perforating machine works, and rotates at a high speed in the rolling process, and the ejector rod pin is subjected to repeated friction, impact and extrusion, so that the faults of abrasion, breakage, failure, channeling and the like are easy to occur.

Therefore, based on the problems, the hollow ejector pin for the punching machine is wear-resistant, impact-resistant, extrusion-resistant, multi-protection and easy to replace, and has important practical significance.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's not enough, provide a hollow ejector pin for piercing punch of wear-resisting, shock-resistant, resistant extrusion, multiple protection, easy change.

The utility model provides a its technical problem take following technical scheme to realize:

the utility model provides a hollow ejector pin for piercing mill which characterized in that: the pin is of a circular tube-shaped structure, two planar structures are arranged at two ends of the pin, the two planar structures at any end and the central axis of the pin are on the same plane and are symmetrical by taking the central axis of the pin as a symmetry axis, and the planar structures at the two ends are symmetrical relative to the cross section of the middle position of the pin;

the pin outer diameter D1 and the wall thickness S1 satisfy: S1/D1 is more than or equal to 0.20 and less than or equal to 0.4;

the radial distance L between the two planar structures at either end of the pin is such that: l is not less than 0.9 and not more than D1 and not more than 0.95 and not more than D1;

two through holes with the diameter D2 are formed in the plane structure of the pin along the central axial direction of the pin, and the diameter D2 of each through hole satisfies the following conditions: D2/D1 of which the ratio is more than or equal to 0.20 and less than or equal to 0.5.

Furthermore, the end faces of the two ends of the pin are chamfered.

The utility model has the advantages that:

the pin of the utility model is a round tube-shaped hollow structure, and has good anti-extrusion performance and good anti-fracture performance; and the plane structure of the pin is provided with two through holes, and the pin is fixed by four bolts during installation, so that the quick disassembly can be realized, the double safety is realized, and the pin is prevented from jumping out after the single bolt fails.

Drawings

The technical solution of the present invention will be described in further detail with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus are not intended to limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.

Fig. 1 is a schematic structural view of a hollow mandril pin for a puncher provided by the embodiment of the invention;

fig. 2 is a structural cross-sectional view of a hollow ejector pin for a puncher provided by an embodiment of the invention;

FIG. 3 is a schematic view of a pin-lift cart of the piercing mill according to an embodiment of the present invention;

fig. 4 is a schematic view of a push rod according to an embodiment of the present invention;

FIG. 5 is a schematic view of the installation and use effect of the embodiment of the present invention;

in the figure: m is a rotating body, and N is a trolley body;

Detailed Description

First, it should be noted that the specific structures, features, advantages, etc. of the present invention will be described in detail below by way of example, but all the descriptions are only for illustrative purpose and should not be construed as forming any limitation to the present invention. Furthermore, any single feature described or implicit in any embodiment or any single feature shown or implicit in any drawing may still be combined or subtracted between any of the features (or equivalents thereof) to obtain still further embodiments of the invention that may not be directly mentioned herein. In addition, for the sake of simplicity, the same or similar features may be indicated in only one place in the same drawing.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The present invention will be described in detail with reference to fig. 1 to 5.

Fig. 1 is a schematic structural view of a hollow mandril pin for a puncher provided by the embodiment of the invention; fig. 2 is a structural cross-sectional view of a hollow ejector pin for a puncher provided by an embodiment of the invention; FIG. 3 is a schematic view of a pin-lift cart of the piercing mill according to an embodiment of the present invention; fig. 4 is a schematic view of a push rod according to an embodiment of the present invention; FIG. 5 is a schematic view of the installation and use effect of the embodiment of the present invention; as shown in fig. 1-5, the pin for the hollow mandril for the puncher provided by this embodiment is a tubular structure, two planar structures a are provided at both ends of the pin, the two planar structures a at either end are on the same plane with the central axis of the pin and are symmetrical with the central axis of the pin as a symmetry axis, and the planar structures a at both ends are symmetrical compared with the cross section at the middle position of the pin;

the pin outer diameter D1 and the wall thickness S1 satisfy: S1/D1 is more than or equal to 0.20 and less than or equal to 0.4;

the radial distance L between the two planar structures at either end of the pin is such that: l is not less than 0.9 and not more than D1 and not more than 0.95 and not more than D1;

two through holes with the diameter D2 are formed in the plane structure of the pin along the central axial direction of the pin, and the diameter D2 of each through hole satisfies the following conditions: D2/D1 of which the ratio is more than or equal to 0.20 and less than or equal to 0.5.

And chamfering the end faces of the two ends of the pin.

For example, in the embodiment, the mandril and the mandril trolley rotating body for the punching machine are inserted into each other through the mode shown in fig. 5, and the pin in the embodiment is inserted into the pin hole between the mandril and the trolley rotating body for fixing the relative position between the mandril and the trolley rotating body so as to realize synchronous rotating motion of the mandril and the trolley rotating body; 4 bolts are arranged on 4 through holes of the pin and used for preventing the pin from jumping out, when the ejector rod is disassembled, two bolts on one side are unscrewed, the pin is pulled out from the other side, when the ejector rod is reassembled, the pin is inserted into the pin hole, and two bolts are screwed from the other side.

The above embodiments are described in detail, but the above description is only for the preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims (2)

1. The utility model provides a hollow ejector pin for piercing mill which characterized in that: the pin is of a circular tube-shaped structure, two planar structures are arranged at two ends of the pin, the two planar structures at any end and the central axis of the pin are on the same plane and are symmetrical by taking the central axis of the pin as a symmetry axis, and the planar structures at the two ends are symmetrical relative to the cross section of the middle position of the pin;

the pin outer diameter D1 and the wall thickness S1 satisfy: S1/D1 is more than or equal to 0.20 and less than or equal to 0.4;

the radial distance L between the two planar structures at either end of the pin is such that: l is not less than 0.9 and not more than D1 and not more than 0.95 and not more than D1;

two through holes with the diameter D2 are formed in the plane structure of the pin along the central axial direction of the pin, and the diameter D2 of each through hole satisfies the following conditions: D2/D1 of which the ratio is more than or equal to 0.20 and less than or equal to 0.5.

2. The hollow ejector pin for a piercing machine of claim 1, wherein: and chamfering the end faces of the two ends of the pin.

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