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seamless steel pipe production line Installation technology of key equipment

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Installation technology of key equipment in modern large scale seamless steel tube production line

[Abstract] in this paper, the structure and installation technology of key equipment of modern large-scale seamless steel tube production line are introduced, which can be used as reference for similar projects.

Piercing mill, mandrel mill, sizing mill, installation

CLC number: TP322+.1 document identification code: A article number: 1009-914X (2015) 21-0044-02

1. General situation of the project

The main equipments of seamless pipe line include piercing mill, continuous rolling mill and sizing machine. The core equipment is continuous rolling mill. The rolling mill imported from Anhui is the most advanced PQF pipe mill in the world at present. In addition, the key equipment of the rolling line are installed in the closed platform elevated +6m, elevated platform formed after the installation of all equipment must rely on the existing road to complete plant hoisting, unable to use large crane hoisting installation process directly, there is no direct reference to the experience. Therefore, in order to install technology of key equipment of the modern large-scale seamless steel pipe production line is studied, and successfully applied in Anhui seamless steel tube technical transformation project, solve the piercer main frame, sizing machine frame and main reducer on technical problems of equipment installation, ensure the construction safety and quality, shorten the the construction period, reduce the cost, improve work efficiency,

2, the main technical characteristics (characteristics)

1) it is difficult to hoist the piercing mill

A total of 2 pieces of punch, respectively. The weight of 76 tons and tons of 72, size: 4800*523*5263mm. plant with weight of 30t and 50t each one journey, +6m elevated platform after the formation of the main frame, punch can not use a large crane hoisting machine; at the same time, 2 frame for the irregular structure, no hanging point the machine frame, lifting must use 4 chain adjustthelevelnessofthemachineracke 2 frame in place a rail parallel to the rolling line, a frame connected by 8 M160 hydraulic bolt, and the bolt is not in the 8 frame after docking to wear, need to wear into a frame. Then in the parallel slide another frame, but there is a common 8 M100 "T" type bolt rack rail support, a frame can not butt in the rack rail support, need to adopt temporary measures to both frame suspended docking, then Overall descent.

2) PQF six stand mandrel mill has high installation accuracy

Anhui Tianda company is the introduction of the world's most advanced lateral transfer roller 6 stand three roll pipe mill, install the PQF framework on the platform of equipment on the 3 drive motor, reducer, 6 spindle bracket, 2 H2 hydraulic station, bearing are about 400T, dynamic load, frame installation in 2 12670mm 2 5673mm 2 beam column, 6378mm column, 4 6740mm beams are connected into a whole. PQF framework platform installation is 6m above the high-altitude operations, not only to ensure that the 6 independent column center and the top surface of the horizontal level, but also ensure that the 6 top surface of the overall flatness, so the installation of high precision.

3) the sizing machine is difficult to put into position

The sizing process of steel tube is hollow with a certain amount of reducing, the steel pipe rolling to size precision and ellipticity of the outer diameter of the tube sizing machine comprises a main frame and a C type reducer, C type main frame single weight 105 tons, the main reducer single weight 95 tons, the foundation is also located in +6 meters overhead on the platform, the scene only 50t and 30t driving each one, can not complete the double lifting. At the same time, the platform edge distance equipment center is about 20m, a large crane can not directly hoisting equipment in place; at the same time, slip to the equipment foundation position, need to vertical landing on the basis between the sliding rail and equipment foundation difference about 1100mm, vertical drop difficult sizing machine.

3. Key operation points of the project

1) large piercing machine frame single lifting, high-altitude docking, overall drop in place installation technology

Assembly tooling and spreader through design, using two sets of 30T and 50T traffic existing within the plant, construction technology of using monolithic assembly, hydraulic lifting space overall in the fall, the rack installation, through independent design, ranging from heavy lifting spreader invented machine, a reasonable set of unequal hanging position, using the moment the weight balance principle, punch through the eccentric sling design reasonable distribution to the two plant in the existing lifting capacity of different (30T and 50T) on the road, to meet the lifting requirements; design and erection of a platform assembled on the base, the mounting surface for the protection of the base, the platform can not contact with the base platform. The height above the top surface of the anchor bolts to remove the influence of anchor bolts on the frame of docking, docking and as a whole on the platform, and then through the hydraulic lifting device makes the whole frame Drop down to the equipment base.

This technique by using self-developed double unequal lifting sling, a reasonable set of unequal hanging position, meet the lifting capacity of the existing road, saving cost of machinery, to ensure the safety of the construction; the overall decline in place through the rack hanging docking technology, ensure the cone piercing machine installation accuracy can meet the design requirements, improve the quality of the installation.

Installation technology of 2 and PQF six stand mandrel mill

3. Key operation points of the project

1) large piercing machine frame single lifting, high-altitude docking, overall drop in place installation technology

Assembly tooling and spreader through design, using both 30T and 50T traffic existing within the plant, construction technology of using monolithic assembly, hydraulic lifting space overall in the fall, the rack installation, through independent design, ranging from heavy lifting spreader invented machine, a reasonable set of unequal hanging position, using the moment the weight balance principle, punch through the eccentric sling design reasonable distribution to the Taiwan plant existing lifting capacity of different (30T and 50T) on the road, to meet the lifting requirements; design and erection of a platform assembled on the base, the mounting surface for the protection of the base, the platform can not contact with the base platform. The height above the top surface of the anchor bolts to remove the influence of anchor bolts on the frame of docking, docking and as a whole on the platform, and then through the hydraulic lifting device makes the whole frame Drop down to the equipment base.

Installation technology of 2 and PQF six stand mandrel mill

PQF pipe mill is the core equipment in the seamless pipe production line, Anhui days is the introduction of the lateral SMSINNSE company design and manufacture of the world's most advanced change roller 6 stand three roll pipe mill (PQF pipe mill), pipe mill is mainly divided into two parts: host part, transmission part; tube rolling machine of the 6 main frame is composed of 9 hexagonal plate assembly to form a large size for 10320*2370*1095mm on the rolling mill main drive on the three directions are distributed in 120 degrees, the transmission is located in the platform above the frame of the main frame, therefore, the installation and upload the main frame a large dynamic framework the installation is the mill installation reference, therefore, to develop the scientific and reasonable installation process, make the process between reasonable and strictly control the installation precision of each procedure, to ensure the overall accuracy and Installation quality. Specific as follows:

(1) PQF large base alignment process research

PQF pipe mill large plate size 10320*2370*1095mm, box type structure, across the channel on both sides of the distribution of 28 M64 "T" type bolt under the drive side by three support bracket, the PQF pipe mill are located in the main part of the base, so the installation accuracy of the base required high rolling line allowable deviation + 0.05mm. Considering the foundation settlement, the elevation of the base surface except the 3 support support position error is within +0.25mm, and the allowable error of the elevation of the other points is +0.2mm. In between the base and the base of the "T" type bolt axial force is 1008 ~ 1170kN, due to the large base drive side is supported by a bracket, so in a rough looking after the first large fastening connecting bolts between the base and bracket, and then tighten all between the equipment base and anchor bolts.

(2) installation of hexagonal plate and hydraulic control in Kokura

PQF tube rolling machine frame is composed of 9 hexagons, each hexagonal plate has 2 positioning key, rack installation order: rack plug device, connect the 3 lower positions in the tin groove, the installation of hydraulic 1#, 2# hexagonal plate and a plate support to install 1# to install the 3# mandrel support rails and 4# 5#, hexagonal plate and semi support to install 2# to install the 6# mandrel support rails and 7#, 8# hexagonal plate and a plate support to install 3# to install 8 core support rails between the hexagonal plate 4 long bolt and tighten all connection between the base plate and the fastening bolt and the 4 bolt long - base two to install the bottom grouting hydraulic storehouse, installation, installation of hydraulic top positions at the lower side of the hydraulic chamber, the installation side of upper hydraulic locking device, storage rack. (3) research on installation accuracy guarantee technology of large frame platform for PQF pipe mill

After careful analysis of the drawings, the construction methods are as follows: first, surface marker cross centre line in each column, the column lifting, the center line and elevation adjustment column, as the column height of about +6000mm, so the control surface elevation of the column to prepare a 5m aluminum ruler and 500mm ruler or precision the column level, alignment error range: elevation: + 0.2mm, center line: + 0.2mm, + 0.2mm, diagonal: level: 0.05mm/m, on the whole surface flatness 0.10mm.

The installation place on the drive gear reducer 12670mm two main beams, each with a diameter of 100mm positioning pin between each column and girder, installed after the fine-tuning of the 2 root elevation of the main beam and the center line, after a good tune of two main beams and column fastening bolts, fastening diagonal fastening points, to prevent local deformation.

Install the first and third beams, one end connected with the main beam fasteners, check the other end contact surface parallelism, according to the actual gap and the sloping plate after fastening the other end, each device contact gap less than 0.05mm, and finally make the final adjustments to the entire framework, using a hydraulic wrench tighten all bolts. The upper surface of the main beam of the large frame which has been adjusted has been adjusted as the datum plane by leveling and aligning the motor and the motor.

According to the structural characteristics and installation requirements of PQF six stand mandrel mill, the installation process and process are established scientifically and reasonably, and the installation precision of each process is strictly controlled

3) installation technology of C sizing machine

According to the structure of sizing machine, and to protect the bottom of the machine will not be scratched and worn, first of all, the invention can be installed disassembly design, large equipment trolley slip, the trolley is removable and can meet the installation requirements of C type main frame, main reducer, and can make the equipment slip to the base position, can quick dismounting trolley out in place, and after the demolition of the trolley for easy handling, the two assembly, repeated use, production cost saving second machine, reduce construction cost, saving construction time; then, according to a large crane to lift position and C type frame installation position, with elevated platform edge as a starting point (a large crane can be C type frame hoisting to elevated platform area), along the elevated platform frame beam parallel to the laying of 2 "L" shaped sliding rail, rail extends to the sizing machine based on The party, in order to reduce the sliding resistance, it was decided: the track along the slope direction based 1/1000, and then put the removable trolley assembly to the platform edge, using 500T large crane type C main frame hanging on an elevated platform, placed on a trolley, the winch and pulley two transverse and longitudinal directions the C type, the lateral and longitudinal moving sizing machine in the sliding trolley, the C type frame slip to the equipment foundation position; finally, because between the sliding track and equipment foundation elevation of about 1100mm, to vertical landing to the foundation, must be dismantled Taiwan car, the C type hydraulic lifting frame through security and stability device for vertical drop and in place, and then the car into the main reducer installation, so repeated once.

By adopting the technology, the horizontal and vertical movement of the C sizing machine and the hydraulic power equipment are realized when the crane lifting capacity does not meet the hoisting requirements, so as to ensure the construction safety, the construction schedule and the installation quality.

4, concluding remarks

In short, the results in Anhui seamless steel tube technical renovation project successfully solved the large punch, C sizing machine, six rack retained mandrel installation problems, the owners were certainly consistent, significant effect, made millions of yuan of direct economic benefits. At the same time, shorten the construction period, the project ahead of time 8 days into production, the rolling line if the annual output of 500 thousand tons, 8 days can produce more than 10000 tons of steel pipe, indirect benefits up to tens of millions of yuan.

Seamless steel tube is one of the important materials in the construction of the national economy, is a kind of economic type varieties of steel, is widely used in petroleum, chemical, electric power, coal, machinery, military, aerospace and other industries, with the rapid growth of the industry, driven by the rapid development of the seamless steel tube, seamless steel pipe to the development direction of varieties high technology content, to promote China's rapid increase in the overall level of equipment of seamless steel tube, will be a large number of advanced production lines for the construction of the new technology, new equipment, therefore, the successful development of the technology and Implementation is of great practical significance to promote China's high quality seamless steel tube production, will provide strong technical support for construction and installation the future of such equipment.

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