Drive unit of shape bending mill

FIELD: rolled stock production, namely equipment of shape bending mills, mainly for making tinned corrugated sheets.

SUBSTANCE: drive unit of shape bending mill with first guiding stand and pulling roller devices includes motor, reduction gear, sprockets, forcing and tensioning gear wheels, roller chain embracing sprockets along S-shaped curve and sine curve. Torque of motor is transmitted only to lower shaping rolls of even stands and of last stand of mill and also to both rolls of guiding stand and to horizontal rollers of pulling devices through sprockets mounted on their axles. Chain embraces sprockets of rolls of guiding stand and of rollers of pulling devices along S-shaped curve and it embraces sprockets of drive rolls and sprockets that are not joined with shaping rolls along sine curve. Axles of sprockets that are not joined with shaping rolls may be arranged higher than axles of lower drive rolls by value determined according to relation given in claims of invention.

EFFECT: lowered cost of shape bending mill, reduced power consumption for profiling, enhanced quality of ready shapes.

2 cl, 1 dwg, 1 ex

 

The present invention relates to rolling production and can be used when creating forming mills that manufacture corrugated sheet sections.

These mills contain a large number of forming stands (up to thirty), which are driven by an electric motor, usually through a reduction gear, shaft, gear box and spindle device. “Traditional” drive mnogoluchevogo roll forming mill is described, for example, in the book edited by Istoricheskogo “Production of roll-formed profiles, M.: metallurgy, 1982, s-149. Recently for forming mills, especially in light type, are increasingly being used chain drive (via roller chains gall), which has a number of advantages over the above-described drive (the relative simplicity of manufacture and operation, less power required of the engine, the possibility of varying the interstand distance and others).

Known drive roll forming mill with asterisks, installed at the ends of the axes of the rolls, and envelope them endless chains, of which the upper and lower sprockets have different diameter, and the chain goes around them in an S-shaped curve (see jap. Pat. CL 12 221.3, No. 1832, publ. 27.01.69). The disadvantages of the drive is a big chain length and the impossibility of varying the number of drive and idle rolls.

Also known drive mnogoluchevogo roll forming mill using sprockets and endless chains, enveloping them in an S-shaped curve, and the power sprocket mounted on separate shafts and separate from the stands supports (see U.S. Pat. Of the Russian Federation No. 2188729, CL 21 D 5/06, publ. in BI No. 25, 2002). The disadvantages of such a drive are the relative complexity of its design and the availability of additional equipment.

Closest to the claimed object is to drive mnogoluchevogo profile bending machine according to U.S. Pat. Of the Russian Federation No. 2110350, CL 21 D 5/06 from 26.08.96,

This drive includes a motor, gear, sprocket, roller chain gall, bending around the sprocket on the S-shaped curve and a sine wave, power and idler gears and is characterized by the presence of additional sprocket diameter smaller than the diameter of the sprocket lower working rolls and which are installed in certain interstand intervals, and the engine and gearbox are located on the inlet side of the mill.

The disadvantage of this drive is the presence of a large number of drive rolls and the need to use chains of great length, which increases the drive of the mill, will increase energy consumption profiling, and in the production of corrugated sheets of galvanized steel with thickness up to 1 mm reduces the level of their quality.

Indeed, when under the upper drive rolls (they usually form the outer surfaces of the corrugations) the inevitable “drop velocity” height corrugation, i.e. for the most part, this height is mutual slippage of the tool (roll) and moldable strip, which not only increases the energy consumption for molding, but also injures the strip (galvanized steel, for example, there are risks and scratches). Therefore, the number of drive rolls (even if it is only the lower rolls of the mill) should be minimal, and the drawing strip workpiece through the cage, it is advisable to carry out a special pulling device.

The technical task of the present invention is the reduction drive mill for the production of predominantly galvanized corrugated sections, the reduction of energy consumption profiling and improving the quality of the finished profile.

To solve this problem, the drive roll forming mill with specifies the first crate and pulling roller device containing a motor, gear, sprocket, roller chain gall, bending around the sprocket on the S-shaped curve and a sine wave, power and idler gears, the torque from the engine is transmitted to only the lower forming rolls even stand and the last stand of the mill, as well as both of the rolls defining the cage and horizontal rollers pulling device through a sprocket mounted on their axes, the chain passes around the sprocket rolls specifies the cage and rollers of the pulling device is S-shaped curve, and sprocket drive roller and a sprocket, not connected with the forming rolls, the sine wave and the axis of the sprocket, not connected with the forming rollers may be mounted above the axes of the lower drive rolls by the value h=(...0,83 0,67)l, where l is the minimum interstand distance of the camp.

The essence of the proposed technical solution is that for pulling moldable strip through calibers mill used at least drive rolls and an additional pulling device, which eliminates the injury received corrugated sheets, reduces power consumption when profiling the power and cost of the drive.

Scheme of the proposed mill drive train shown in the drawing (Roman numerals - numbers stands; shows only part of the drive from the entrance to the camp).

The engine 1 to the drive through the gear 2 transmits torque to the power gear 3, which is using the chain 4 rotates the sprockets on both rolls (upper 5 and lower 6) specifies the cage I. Drive sprocket 7 of the lower rolls even stands II, IV, VI, etc. mounted on the axes of these rollers also rotate by movement of the chain 4 (the arrows show the direction of its motion). Sprocket 8, not United with rollers which serve for the transportation chain, and they are in the same axial plane with the rollers odd mill III, V, VII, etc.

Both sprockets 9 and 10, the pull of the mouth of the STS (in the drawing it is located between the IX and X stands), as the sprockets 5 and 6 stand I, gebaude chain on S-shaped trajectory, and sprockets 7 and 8 on the sine wave. Last stand of the mill is the tension of the toothed wheel (not shown), under the chain 4 is installed aware subcode 11, the number of which is determined by the length of the camp.

Stand United in blocks 12, between which in turn established haul-offs and vertical rollers 13.

As shown by experimental verification (see below), when profiling strips with a thickness of more than 0.9 mm, the location of the sprockets 7 and 8 on the same horizontal can lead to “out” the chain with the sprocket due to a too small angle of coverage of their circuit (i.e. the circuit is in contact simultaneously with too small number of teeth of the sprocket). Therefore, to expand the technological capabilities of the mill (for example, profiling strips with thickness up to 1.5 mm) should the axis of the sprocket 8 positioned above the axes of the sprockets 7 (and lower rolls) by the amount determined experimentally: h=(...0,83 0,67)l, as shown in the drawing. In addition, the increase of the angle of coverage of the sprocket chain reduces the wear of their teeth and the rollers. When h<0,67l distance between the stars is at a critically low from the point of view of their operation and installation of the chain, and when h>0,83l increase the dimensions of the cage, chain length decreases the angle of coverage of the sprocket chain with known neg is Linyi consequences.

Tests found technical solutions implemented in the plate rolling shop №7 and CJSC “PSC” OJSC “Magnitogorsk iron & steel works”.

To this end, a roll forming mill for the production of corrugated sheet profiles (mostly from galvanized steel with a thickness of 0.7...1.5 mm) were tested different ways drive: with all the drive rollers driven lower rolls all forming stands and with the proposed scheme (see drawing).

The best results (lowest cost of equipment, the smallest required for profiling the power and the practical absence of surface defects profiles) obtained using the proposed drive. The worst results (increase in required power is almost doubled, increasing hardware costs by 20% and the rejection of surface defects up to 8% galvanized profiles) obtained using the drive of all the rolls of the mill. About intermediate values were obtained for driving only the lower rolls of the mill.

In addition, they performed a feasibility study of a variant of the drive mnogoluchevogo mill, is selected as the closest analogue (see above), which showed that the cost of this drive more than approximately 40%, the energy consumption is higher (due to the higher 1.5...1.7 times the length of the chain and matched with the existing friction losses) almost 60%, and the need to compress non-driven upper rolls to drive the bottom (for pulling moldable strip without slipping in calibers) in the absence of pulling devices will inevitably cause the above-mentioned defects of the profile.

Thus, experimental validation confirmed the acceptability of the proposed technical solution for the implementation of its objectives and its advantages over the known object.

According to the Central control laboratory of OJSC “MMK” the use of the proposed drive on the sheet roll forming mills will reduce the labor involved in the production of not less than 15%.

Specific example

Novokletevoj roll forming mill for the production of corrugated sheets of thickness 0.5...1.5 mm and a width of 400...1250 mm galvanized steel contains 28 stands, of which the first is specifying. In interstand intervals IX...X and XVII...XVIII stands installed pulling device (see). All even stand - driven bottom rolls.

The maximum distance between stands (IX, X, XVII, XVIII) - 0.9 m, and the minimum of 0.6 m Stars odd cages installed above the lower drive rolls on the value of h=0.75·l=0,75·0,6=0,45 m

The engine 90 kW; chain gall - double-row increments t=30 mm and a breaking load of 19 TS.

1. The drive roll forming mill with specifies the first crate and pulling roller devices contains the engine, gearbox, sprockets, power and idler gears, roller chain gall, bending around the sprocket on the S-shaped curve and a sine wave, characterized in that the torque from the engine is transmitted to only the lower forming rolls even stand and the last stand of the mill, as well as both of the rolls defining the cage and horizontal rollers pulling device through a sprocket mounted on their axes, the chain passes around the sprocket rolls specifies the cage and rollers pulling devices on an S-shaped curve and sprocket drive roller and a sprocket, not connected with the forming rolls, the sine wave.

2. The actuator according to claim 1, characterized in that the axis of the sprocket, not connected with the forming rollers which are mounted above the axis of the lower drive rolls by the value h=(...0,83 0,67)l, where l is the minimum interstand distance of the camp.



 

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3 cl, 1 dwg, 1 ex

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FIELD: rolled stock production, namely equipment of shape bending mills, mainly for making tinned corrugated sheets.

SUBSTANCE: drive unit of shape bending mill with first guiding stand and pulling roller devices includes motor, reduction gear, sprockets, forcing and tensioning gear wheels, roller chain embracing sprockets along S-shaped curve and sine curve. Torque of motor is transmitted only to lower shaping rolls of even stands and of last stand of mill and also to both rolls of guiding stand and to horizontal rollers of pulling devices through sprockets mounted on their axles. Chain embraces sprockets of rolls of guiding stand and of rollers of pulling devices along S-shaped curve and it embraces sprockets of drive rolls and sprockets that are not joined with shaping rolls along sine curve. Axles of sprockets that are not joined with shaping rolls may be arranged higher than axles of lower drive rolls by value determined according to relation given in claims of invention.

EFFECT: lowered cost of shape bending mill, reduced power consumption for profiling, enhanced quality of ready shapes.

2 cl, 1 dwg, 1 ex

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