RU2256522C1 - Drive unit of shape bending mill - Google Patents

Abstract

FIELD: rolled stock production, possibly development of shape bending mills.

SUBSTANCE: drive unit includes motor, reduction gear, power and tension gear wheels, pairs of upper and lower supports where sprockets embraced along curve by means of Gall's chain are mounted on shafts. Said supports are arranged by two mutually parallel rows; axes of all pairs of supports of mutually opposite rows are in different vertical planes. All sprockets are arranged in one vertical plane between rows of supports.

EFFECT: lowered cost of drive unit and reduced expenses for its operation.

3 cl, 2 dwg, 1 ex

Description

The present invention relates to rolling production and can be used to create roll forming mills that produce high-quality cold-formed sections.

As a drive of light-type roll forming mills, usually using a strip blank of a thickness of no more than 2 mm and a width of up to 150 mm, a chain drive has recently been increasingly used, which has several advantages over the “traditional” drive (see, for example, Steel magazine) , No. 3, 1997, p. 42-43), with a power take-off shaft, gear stands and spindles. The chain drive is relatively inexpensive and can be manufactured on its own at a metallurgical plant producing bent sections of rolled products. The structure of the chain drive equipment necessarily includes, in addition to the engine and gearbox, power and idler gears and sprockets, the axes (shafts) of which are directly connected to the shafts of the working stands of the roll forming mill.

A roll forming mill drive is known with the help of sprockets mounted on the ends of the roll axes, and an endless chain enveloping them, in which the upper and lower sprockets have different diameters, and the chain bends around them along an S-shaped curve (see Japanese Pat. Cl. 12 C 221.3, No. 1832, published on January 27, 69). Also known is a multi-roll roll forming mill drive having additional sprockets, the diameter of which is less than the diameter of the sprockets of the lower working shafts and which are installed in certain inter-span spaces (see Pat. RF No. 2110350 class. 21 D 5/06, publ. In BI No. 13, 1998).

A disadvantage of the known chain drives is the inability to use them simultaneously for two roll forming mills with different characteristics.

Closest to the claimed object is the drive roll forming mill according to US Pat. RF №2188729 class In 21 D 5/06, publ. in BI No. 25, 2002

This drive contains an engine, a gearbox, power and idler gears, pairs of upper and lower sprockets, enveloped along the S-shaped curve by the Gall chain, and is characterized by the fact that the sprockets are mounted on separate shafts (axles) and in bearings that are separate from the stands.

The disadvantage of the drive of this design is its inapplicability for two mills at the same time, as well as its relatively high cost.

Indeed, the presence of two bearings and shafts for each pair of sprockets, as well as couplings, make the costs of manufacturing such a drive comparable to the cost of the mill itself, especially the light type with cantilever mounting of the rolls in the supports of the bench without stands.

The technical task of the present invention is to reduce the cost of the drive roll forming mill, mainly light type, and reducing the cost of its operation.

To solve this problem, a drive containing an engine, gearbox, power and idler gears, pairs of upper and lower bearings, in which sprockets are mounted on the shafts, are enveloped along the S-shaped curve by the Gall chain, the bearings are located in two parallel rows, with the axes all pairs of supports of opposite rows lie in different vertical planes, and all the stars are placed in one longitudinal vertical plane between the rows of supports; the axis of one row of supports can coincide with the middle of the horizontal distance between the supports of another row, and the upper and lower sprockets of one row and similar sprockets of another row can be made with different diameters.

The essence of the claimed technical solution consists in the possibility of using the drive of the above construction simultaneously for two roll forming mills, each of which can work autonomously and profile a strip blank with different characteristics and, if necessary, with different angular (and linear) speeds.

In this case, a drive containing one motor, one gearbox, one power and tension wheel, as well as one chain will cost less than two drives and occupy a smaller production area. In addition, by reducing friction losses, the engine power required by this drive will be less than the total power of the drives of two, stand-alone mills.

The proposed drive is schematically shown in figure 1 (top view), and a diagram of the envelope of chain sprockets - in figure 2.

The drive motor 1 through the gearbox 2 drives the toothed power wheel 3 mounted in the support 4. The Gall 5 roller chain goes around the wheel 3 and the upper 6 and lower 7 drive sprockets, each of which is installed in the individual support 8. The sprockets are enveloped by a chain according to S- shaped curve. The tension of the chain 5 is adjusted using the idler gear 9.

The supports of 8 sprockets 6 and 7 are located in two rows parallel to the longitudinal axis xx of the row drive, and all the sprockets lie in one longitudinal vertical plane. At the ends of the shafts of the sprockets 6, facing the working stands of the roll forming mill (not shown), couplings 10 (for example, electromagnetic) are installed, with which any mill roll is quickly disconnected from the drive (if necessary).

The yy axis of all pairs of supports 8 lie in different vertical planes, while the axes of one row of supports can coincide with the middle of the horizontal distance l between the supports of another row, and the upper 6 and lower sprockets 7 of different diameters, respectively, D and d (D> d ) In addition, the diameters D and d of the sprockets for adjacent stands (I and II, II and III and III and IV) may differ, i.e. the stars of stands I, III, and V have the same values of D and d, and the stars of stands II and IV have different values.

When preparing the drive for operation, the chain tension is checked, as well as the condition of the connection of the sprocket shafts with the rolls of the mill working stands (clutches on or off). Then the engine starts and the profiling starts either simultaneously on both mills, or only on one of them and for a given ratio of drive and idle rolls of the working stands.

The proposed drive is scheduled for manufacture and installation in sheet rolling shop No. 7 of OJSC “Magnitogorsk Iron and Steel Works” on lightweight high-quality mills profiling strip blanks with a cross section of 0.3 ... 1.2 × 20 ... 100 and 0.5 ... 2 , 0 × 40 ... 250 mm ² .

Feasibility studies have shown that the cost of the claimed drive of these mills will be less than the cost of two drives of known design (see above) by 40 ... 60%, and the cost of its operation will be reduced by no less than 30%, which will reduce the cost rental and, accordingly, increase profits from its sale.

Concrete example

The drive of the roll-forming “double” lightweight mill with two 12 stand mills 0.3 ... 1.2 × 20 ... 100 and 0.5 ... 2.0 × 40 ... 250 is made according to the scheme shown in figures 1 and 2. Engine power - 35 kW; the profiling speed of the mill "0.3 ... 1.2" - 0.5 m / s, the mill "0.5 ... 2.0" - 0.6 m / s.

The sprockets of the mills are installed in supports located in two parallel rows, and each shaft of the sprockets (upper and lower) is in an individual support.

The diameters D of all the upper sprockets are 1.8 times greater than the diameters d, the lower sprockets are 1.8 times, and the values of D and d, the sprockets of the “0.5 ... 2.0” mill, are larger than those of the “0.3 ... 1, 2 ”1.2 times.

As the drive chain, a single-row Gall roller chain with a step of 19.05 mm and an allowable tensile load of 3800 kg was selected (see “The Metalworker's Manual”, edited by N.S. Acherkan, vol. 2, M., “Mashgiz”, 1958, p. 596, table 36).

Electromagnetic couplings with a power closure by magnetic attraction are installed on the drive shafts (see, for example, “Explanatory Dictionary of Mechanical Engineering” by B.V. Zakharova et al., M., “Russian Language”, 1987, p. 131), which makes it possible to quickly disconnect any roll from the drive.

Claims (3)

1. The drive of a roll forming mill, mainly of light type, containing an engine, gearbox, power and idler gears, pairs of upper and lower bearings, in which sprockets are mounted on the shafts, enveloped along the S-shaped curve by a Gall chain, characterized in that the supports are located in two parallel rows, while the axes of all pairs of supports of opposite rows lie in different vertical planes, and all the stars are located in one longitudinal vertical plane between the rows of supports. 2. The drive according to claim 1, characterized in that the axis of one row of supports coincide with the middle of the horizontal distance between the supports of another row. 3. The drive according to claim 1, characterized in that the upper and lower sprockets of one row and similar sprockets of another row are made with different diameters.

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