RU-2861296-C1 - DEVICE FOR INJECTING LUBRICATING-DEOXIDISING MATERIAL ONTO INNER SURFACE OF SLEEVE

RU2861296C1RU 2861296 C1RU2861296 C1RU 2861296C1RU-2861296-C1

Abstract

FIELD: gas industry. SUBSTANCE: invention relates to a device for injecting a lubricating-deoxidising material onto the inner surface of a sleeve. The device comprises a vertical stand with a mounting plate, on which an assembly for generating gas vortex flows is fixed, containing a housing with a cover, with a spray head installed in it. The spray head is made in the form of a conical expander, in which a flow divider for the lubricating-deoxidising material is coaxially placed, made with a nozzle hole and a spherical end directed inside the conical expander. In the cover of the assembly for generating gas vortex flows, nozzle holes are made, evenly spaced around the conical expander and directed towards its longitudinal axis. The conical expander is installed and fixed in a common precision hole of the cover and the housing of the assembly for generating gas vortex flows. EFFECT: elimination of losses during the supply of lubricating-deoxidising material and its uniform distribution over the sleeve. 4 cl, 2 dwg, 1 tbl

Inventors

KUZNETSOV VLADIMIR IVANOVICH
Novikov Timur Olegovich
Sokolov Dmitrij Konstantinovich
KRIVOSHEEV ANDREJ ALEKSANDROVICH
Pashnina Elena Yurevna
KOPYLOV PETR LEONIDOVICH
NAUMOV ALEKSANDR MIKHAJLOVICH
Meshcheryachenko Artem Andreevich
ZINCHENKO ANNA VLADIMIROVNA
POPOV ANDREJ VLADIMIROVICH

Dates

Publication Date: 20260504
Application Date: 20251013

Claims (7)

1. A device for blowing a lubricating and deoxidizing material onto the inner surface of a sleeve, characterized in that it contains a vertical post with a mounting plate on which a unit for forming vortex gas flows is fixed, comprising a housing with a cover, with a spray head installed therein, made in the form of a conical expander, in which a lubricating and deoxidizing material flow divider is coaxially located, made with a nozzle opening and a spherical end directed into the conical expander, and a pipeline for supplying a lubricating and deoxidizing material connected to the conical expander, wherein in the cover of the unit for forming vortex gas flows there are nozzle openings arranged uniformly around the conical expander and directed towards its longitudinal axis, the conical expander is installed and fixed in a joint precision hole in the cover and the housing of the unit for forming vortex gas flows, to which a pipeline for supplying gas is connected from the end side, and the ratio between the opening angle α of the conical expander and its length L is determined from expressions: Where:
D - outlet diameter of the conical expander,
d - input diameter of the conical expander,
L is the length of the conical expander, where the angle α is in the range determined by the expression 15°≥α≥5°.
2. The device according to paragraph 1, characterized in that the diameter of the housing of the unit for forming vortex gas flows is not less than 1.1 times the outer diameter of the sleeve.
3. The device according to paragraph 1, characterized in that the distance l, mm, between the cover of the unit for forming vortex gas flows and the sleeve is selected from the expression 50<l<350.
4. The device according to paragraph 1, characterized in that the body of the unit for forming vortex gas flows is hermetically connected to the cover.

Description

The invention relates to pipe rolling production, namely to devices for blowing a powder lubricating and deoxidizing material onto the inner surface of a sleeve during the production of hot-rolled seamless pipes. A device for delivering powdered lubricant to the inner surface of a liner is known (RU Patent No. 2375133, B21B 45/02, published December 10, 2009). The device comprises a lubricant hopper, a portion-feed mechanism for delivering lubricant, and a nozzle connected to a pressurized air purge chamber and the portion-feed mechanism. The portion-feed mechanism is designed as a driven vertical auger. The mechanism body and the purge chamber are mounted on the hopper coaxially with the hopper outlet, and the purge chamber is connected to the nozzle and the pressurized air supply pipeline via a flexible element. The disadvantage of this device is the incomplete and uneven treatment of the inner surface of the sleeve along its length with powder lubricant. The closest technical solution adopted as a prototype is a device for blowing a lubricating and deoxidizing material onto the inner surface of a sleeve (RU Patent No. 2808491, IPC B21B 17/04, published on 28.11.2023, Bulletin No. 34). The device comprises a spray head including a pipeline for feeding a lubricating and deoxidizing material (hereinafter referred to as LDM) with a conical expander at the end, in which a flow divider of the LDM, made with a nozzle opening, is coaxially located, and a unit for forming vortex gas flows, connected to the pipeline for feeding gas and made with nozzle openings located around the conical expander of the pipeline and directed towards the longitudinal axis of the spray head, in addition, the device is provided with a protective disk and a mounting plate. The protective disk is made with holes, placed perpendicular to the longitudinal axis of the spray head and connected to the unit for forming vortex gas flows, the mounting plate is made with an opening and installed with the possibility of vertical movement, while the spray head is installed on the side of the conical expansion in the unit for forming vortex gas flows, and on the other side it is fixed in the opening of the mounting plate, the flow divider is made with a spherical end directed into the conical expansion. A disadvantage of this device is that the conical expander with its built-in spreader and the protective disk heat up during operation. This causes the blown-out SDM powder to adhere to the inner surface of the conical expander and the spreader nozzle orifice. These surfaces gradually become coated, leading to a narrowing of the flow areas. The volume of SDM supplied to the barrel decreases, resulting in a reduction in the quality of the finished pipe's inner surface, the durability of the rolling mandrels, and increased SDM consumption. Another drawback of this device is that the gas supply to the vortex flow unit is fed from the side surface, which does not ensure uniform gas flow into the core through the nozzle openings evenly spaced around the conical expander. This results in uneven processing of the core's inner surface both along the perimeter and along the length of the core. This reduces the quality of the core's inner surface and the durability of the continuous mill's rolling mandrels. Another drawback of this device is the large conical expansion angle over a short length. This reduces the flow density and stability due to increased turbulence in the flow of SDM powder particles at the leading end of the core, reducing the number of particles contacting the leading end and, therefore, processing it. This results in an uneven distribution of SDM particles along the length of the core, which reduces the quality of the inner surface of the finished pipes and the durability of the rolling mill mandrels. Another drawback of this device is that the spray head, loosely mounted on the side of the conical expansion of the pipeline in the vortex gas flow unit on one side and loosely fixed in the mounting plate opening on the other, is free to shift relative to the longitudinal axis of the vortex gas flow unit within the existing clearances. This leads to uneven processing of the inner surface of the SDM sleeve, which subsequently reduces the quality of the inner surface of the finished pipes and the durability of the rolling mill mandrels. The technical challenge is to create a device for injecting SDM onto the inner surface of a liner, which improves the quality of the inner surface of finished pipes and increases the service life of rolling mill mandrels by eliminating losses during the SDM feed and ensuring its uniform distribution throughout the liner. The technical result is to ensure a laminar flow of the SDM feed jet formed at the outlet of the spray head, due to the design features of the conical expander, ensuring the positioning of the longitudinal axis of the conical expander relative to the longitudinal axis of the unit for the forma