CN216937741U

CN216937741U - Protection architecture of cold drawn pipe

Info

Publication number: CN216937741U
Application number: CN202121277459.8U
Authority: CN
Inventors: 吴志刚
Original assignee: Hubei Cahen Industrial Co ltd
Current assignee: Hubei Cahen Industrial Co ltd
Priority date: 2021-06-08
Filing date: 2021-06-08
Publication date: 2022-07-12
Anticipated expiration: 2031-06-08

Abstract

The utility model relates to the technical field of cold drawn pipes, in particular to a protection structure of a cold drawn pipe, which comprises a steel pipe, wherein an outer die is sleeved at one end of the steel pipe, a core rod is arranged inside the steel pipe, one end of the core rod protrudes out of the steel pipe, an inner die is sleeved at one end of the core rod, a bolt is installed at one end of the inner die in a threaded mode, a plug is fixedly installed at the other end of the core rod, a limiting plate is fixedly installed at the outer end of the plug, a first installation groove is formed in the inner die, a plurality of first springs are fixedly installed in the first installation groove, the first springs are uniformly distributed around the first installation groove, a first lining plate is fixedly installed at the outer end of each first spring, and the first lining plate can be matched with the first installation groove. The utility model can ensure that the second lining plate is always attached to the inner wall of the steel pipe according to the change of the inner wall of the steel pipe, thereby avoiding the radial play of the core rod.

Description

Protection architecture of cold drawn pipe

Technical Field

The utility model relates to the technical field of cold drawn pipes, in particular to a protection structure of a cold drawn pipe.

Background

A cold drawn steel pipe is a kind of steel pipe, which is classified into different types according to production processes, and is formed by cold drawing in multiple passes during diameter expansion of a raw pipe blank or a raw pipe, which is generally performed on a single-chain or double-chain type cold drawing machine of 0.5 to 100T, differently from a hot rolled (expanded) pipe. The cold-rolled (drawn) steel tube comprises a carbon thin-wall steel tube, an alloy thin-wall steel tube, a stainless thin-wall steel tube and a special-shaped steel tube besides a common steel tube, a low-medium pressure boiler steel tube, a high-pressure boiler steel tube, an alloy steel tube, a stainless steel tube, a petroleum cracking tube, a machining tube, a thick-wall tube and a small-caliber inner die cold-drawn tube;

in the traditional cold drawing device, a core rod and an inner die are fixed at the right center of a steel pipe and do not move, but in the actual drawing process, due to the fact that the wall thickness, concentricity, straightness and the like of the steel pipe are uneven, the core rod and the inner die move radially in the steel pipe, the wall thickness deviation of the same section of the steel pipe is enlarged, the bending degree of the steel pipe is increased, the local stress of the steel pipe which is bent too much is too large when the steel pipe enters an outer die, the bent part cannot normally enter the outer die, and the wall thickness of the bent part is increased or even broken; the larger the moving amplitude of the core rod and the inner die is, the worse the cold drawing quality of the steel tube is. For example: when drawing a Φ 356 × 8 (outer diameter × wall thickness) steel pipe, there is a problem that a local wall thickness variation of about 1m is large or cracks frequently occur, and the steel pipe is scrapped.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defect that the moving amplitude of a core rod and an inner die in a steel pipe is large in the prior art, and provides a protection structure of a cold drawn pipe.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a protection architecture of cold drawn pipe, includes the steel pipe, the pot head of steel pipe is equipped with outer mould, the inside of steel pipe is provided with the core bar, the one end of core bar is protruded to the outside of steel pipe, the pot head of core bar is equipped with the inner mould, the bolt is installed to the one end screw thread of inner mould, the other end fixed mounting of core bar has the end cap, the outer end fixed mounting of end cap has the limiting plate, first mounting groove has been seted up on the inner mould, fixed mounting has a plurality of first springs in the first mounting groove, first spring is around first mounting groove evenly distributed, the outer end fixed mounting of first spring has first welt, first welt can cooperate with first mounting groove.

Preferably, a second mounting groove is formed in the plug, a plurality of second springs are fixedly mounted in the second mounting groove, and the second springs are uniformly distributed around the second mounting groove.

Preferably, a second lining plate is fixedly mounted at the outer end of the second spring, and the second lining plate can be matched with the second mounting groove.

Preferably, the outer diameter of the limiting plate is larger than the inner diameter of the steel pipe.

The protection structure of the cold drawn pipe provided by the utility model has the beneficial effects that:

1. the plug effectively limits the radial moving amplitude of the core rod in the steel pipe needing cold drawing in the drawing process, thereby preventing or reducing the expansion of wall thickness deviation; in addition, the second liner plate can be always attached to the inner wall of the steel pipe by the second spring according to the change of the inner wall of the steel pipe, so that the radial play of the core rod is avoided;

2. the first liner plate can be always attached to the inner wall of the steel pipe through the first spring according to the change of the inner wall of the steel pipe, so that the central axis of the core rod is coincided with the steel pipe, the inner die is prevented from moving radially, and the quality of a cold drawn pipe is improved.

Drawings

FIG. 1 is a schematic structural diagram of a protection structure of a cold drawn pipe according to the present invention;

FIG. 2 is a cross-sectional view of a protective structure of a cold drawn pipe according to the present invention;

FIG. 3 is a schematic structural diagram of an inner mold of a protection structure for a cold drawn pipe according to the present invention;

fig. 4 is a schematic structural diagram of a plug of a protection structure of a cold drawn pipe according to the present invention.

In the figure: the steel pipe comprises a steel pipe 1, an outer die 2, a core bar 3, an inner die 4, a first mounting groove 41, a first spring 42, a first lining plate 43, a bolt 5, a plug 6, a second mounting groove 61, a second spring 62, a second lining plate 63 and a limiting plate 7.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-4, a protection structure of a cold drawn pipe comprises a steel pipe 1, wherein an outer die 2 is sleeved at one end of the steel pipe 1, a core bar 3 is arranged inside the steel pipe 1, one end of the core bar 3 protrudes out of the steel pipe 1, an inner die 4 is sleeved at one end of the core bar 3, and the core bar 3 is used for driving the inner die 4 to move in the steel pipe 1; a bolt 5 is installed at one end of the inner die 4 in a threaded mode, and the bolt 5 is used for positioning and installing the inner die 4; a plug 6 is fixedly installed at the other end of the core rod 3, a second installation groove 61 is formed in the plug 6, a plurality of second springs 62 are fixedly installed in the second installation groove 61, the second springs 62 are uniformly distributed around the second installation groove 61, a second lining plate 63 is fixedly installed at the outer end of each second spring 62, and the second lining plate 63 can be matched with the second installation groove 61; the plug 6 effectively limits the radial moving amplitude of the core rod 3 in the steel pipe 1 needing cold drawing in the drawing process, thereby preventing or reducing the expansion of wall thickness deviation; in addition, the second spring 62 can make the second liner plate 63 always attached to the inner wall of the steel tube 1 according to the change of the inner wall of the steel tube 1, thereby avoiding radial play of the core rod 3.

A limiting plate 7 is fixedly arranged at the outer end of the plug 6, the outer diameter of the limiting plate 7 is larger than the inner diameter of the steel pipe 1, and the limiting plate 7 is used for limiting the core rod 3 so as to prevent the core rod 3 from being completely led into the steel pipe 1 and being difficult to pull out; a first mounting groove 41 is formed in the inner mold 4, a plurality of first springs 42 are fixedly mounted in the first mounting groove 41, the first springs 42 are uniformly distributed around the first mounting groove 41, a first lining plate 43 is fixedly mounted at the outer ends of the first springs 42, and the first lining plate 43 can be matched with the first mounting groove 41; the first spring 42 can make the first lining plate 43 always fit with the inner wall of the steel pipe 1 according to the change of the inner wall of the steel pipe 1, so that the central axis of the core rod 3 coincides with the steel pipe 1, the radial movement of the inner die 4 is avoided, and the quality of the cold drawn pipe is improved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the utility model concepts of the present invention in the scope of the present invention.

Claims

1. The protection structure of the cold drawn pipe comprises a steel pipe (1), wherein an outer die (2) is sleeved at one end of the steel pipe (1), a core rod (3) is arranged inside the steel pipe (1), one end of the core rod (3) protrudes out of the steel pipe (1), an inner die (4) is sleeved at one end of the core rod (3), a bolt (5) is installed at one end of the inner die (4) in a threaded manner, the protection structure is characterized in that a plug (6) is fixedly installed at the other end of the core rod (3), a limiting plate (7) is fixedly installed at the outer end of the plug (6), a first installation groove (41) is formed in the inner die (4), a plurality of first springs (42) are fixedly installed in the first installation groove (41), the first springs (42) are uniformly distributed around the first installation groove (41), and a first lining plate (43) is fixedly installed at the outer end of the first springs (42), the first liner plate (43) can be matched with the first mounting groove (41).

2. A protection structure for a cold drawn pipe according to claim 1, wherein the plug (6) is provided with a second mounting groove (61), a plurality of second springs (62) are fixedly mounted in the second mounting groove (61), and the second springs (62) are uniformly distributed around the second mounting groove (61).

3. A protection structure for a cold drawn pipe according to claim 2, wherein a second liner plate (63) is fixedly installed at the outer end of the second spring (62), and the second liner plate (63) can be matched with the second installation groove (61).

4. A protection structure for cold drawn pipes according to claim 1, characterized in that the external diameter of the limit plate (7) is larger than the internal diameter of the steel pipe (1).