SU956565A1 - Surge valve of blast furnace - Google Patents

Description

This invention relates to ferrous metallurgy, in particular to the equipment of a blast furnace.

A leveling valve is known, consisting of a body with a seat mounted in it, pivotally connected to a lever, fixedly mounted on a shaft, supported on sub-adapter supports and connected to an actuator consisting of a gearbox and electric motor through a lever system. A counter-load is mounted on the valve shaft, which serves to press the plate to the seat in the closed position of the valve 1.

The disadvantage of such valves is the limited life of their parts. This is due to the fact that in the process of opening the valve the plate moves at low speed and the valve parts (saddle, plate and body), while moving for a long time at high speed, the dusty gas flow is quickly deteriorated.

-. The low speed of opening the valve is due to the fact that during the acceleration of the engine it needs to overcome the maximum moment created by the pressure of the gas on the plate and the mass of the counterweight.

Closest to that proposed by the technical entity is a valve consisting of a body with a seat, a plate, pivotally connected to a lever fixedly mounted on a shaft supported on bearing supports.

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The valve shaft communicates with the actuator by means of a chain, one end of which interacts with a sector mounted on it, and the other end with a worm gear mounted on the shaft

15 with an eccentric drum designed in such a way that its radius increases in proportion to the reduction of the moments on the valve shaft when opened. This makes it possible

20 to facilitate the operation of the drive and reduce its installation capacity 2.

However, a disadvantage of this valve is also the short service life of the parts, due to its slow opening of "25" digging. (opening time 2; 5-3 s).

The purpose of the invention is to increase the service life and simplify the design.

The goal is achieved by that the equalizing valve of the blast furnace, including the housing with the saddle, ta30

a relay pivotally connected to a lever mounted on a warp mounted in two bearing supports; a shaft rotation drive; the valve is provided with a sleeve mounted on a shaft coaxially with it, inside which is fixed a cam with two rollers symmetrical with respect to the axis of the shaft, coupled with levers, one ends of which the support is sineny, while the others are pivotally connected to the holder, while the holder is connected to the rotational drive by means of a crank mechanism.

Due to the fact that the cam mounted on the shaft engages with two pivotally attached and connected rollers, the drive is accelerated before the valve starts, and the spring element accumulates energy, which it gives to the shaft-lever mechanism when the valve opens. plate Since the valve-lever-plate system acts on the shaft-lever-plate system, the moment transmitted from the actuator through the clip and the moment determined by the deformation of the elastic element, the speed of the plate will be several times higher than that of standard balancing valves.

FIG. 1 shows the proposed equalization valve of a blast furnace; in fig. 2 is a sectional view in FIG. 1; in fig. 3 shows a section BB in FIG. one; in fig. 4 is a view of Fig. 1; on

FIG. 5 shows a section B-B in FIG. 3

The valve consists of a housing 1c

mounted with a saddle 2, which comes into contact with the plate 3, pivotally connected to the lever 4, fixedly mounted on the shaft 5, resting on the bearing supports 6. On the shaft 5, a cam 7 is mounted, having an ellipsoidal profile and interactions with two symmetrically located rollers 8, each of which is connected through a bearing support with a lever 9, one end of which is connected to an up1) coal element 10 (spring by a spring), and the other end is connected to a drive sleeve 11 by means of a hinge. The drive sleeve 11 is installed coaxially with the shaft 5 in bearings 12 p connected by a crank mechanism 13 with a rotational drive consisting of a worm gear 14 and an electric motor 15 (the kinematic connection of the drive 11 with the drive can be accomplished through another elements, for example, toothed sectors or chain transmissions).

The geometrical parameters of the cam profile 7 and the stiffness of the elastic element 10 are chosen so that when you turn the drive wallpaper | and | s 11 at the maximum specified angle relative to the cam (angle (L,

FIG. 5), the force of action of the rollers on it created on the shaft 5 a moment equal to the moment determined by the pressure of the gas compacted in the working space of the gas on the plate 3.

HpejviaraeMoe arrangement. Works as follows.

In the open position of the valve, the rollers 8 are in contact with the surface of the cam profile at a point located at the shortest distance from the center of the cam (d. O).

When the valve is closed, the torque is transmitted from the actuator to the drive sleeve 11, during rotation of which the rollers move on a surface; Cam profile deviated from its minor axis by an angle d (Fig. 5) The distance from the center of the cam to the points of its contact with the rollers will increase and the rollers will deform the other elements by means of levers. Due to this, the drive sleeve 11 will act on the cam 7, giving it a moment (M) which is proportional to the angle d. This is due to the fact that the absolute magnitude of the force of the rollers B on the cam 7 (N) depends on the magnitude of the deformation of the elastic element, and the magnitude of the arm of this force (h) (the force h is directed along the radius of curvature of the cam profile) .

During the period when M will be equal to the moment due to friction in the supports 6 and the weight of the parts (plate 3, lever 4) acting on the shaft, cam 7 will begin to synchronize with the drive sleeve 11 and stop when the plate 3 comes into contact with the saddle 2. After that, the sleeve 11 rotates until the moment transmitted to the cam (M,) is equal to the required moment of pressing the plate 3 to the saddle 2 (the value called f "JMeHTa is calculated from the condition of creating the required specific pressures in the contact zone of the saddle 2 with the plate 3) ,

When the valve is opened, the drive cage 11 is driven by the drive in rotation (the rollers 8 move along the cam profile surface in the direction of decreasing the angle ct). In this case, the elastic element 10 gives up accumulated during its deformation: energy to the drive, contributing to the acceleration of the latter, and the cam 7 remains stationary until the rollers 8 move by an angle (b) (Fig. 5). During this period, time M will be equal to the moment (M (-), due to gas pressure on the plate 3. When M ,, M. the shaft starts to rotate. As the valve opens, the gas pressure in the working space decreases, at the angle of meeting of the plate 3 with the gas flow decreases (this leads to an intensive decrease in gas pressure on the plate), then the moment Mf-cut Consequently, due to a moment equal to M) - Mr, shaft 5 will pick up acceleration and its angular velocity will increase significantly as compared with the lead case 11, Later, after the moments Mr and Mf equalize (at an angle p, close to to zero), both shafts will open synchronously until the plate 3 turns on.

Calculations and studies carried out on a laboratory setup, made on a scale of 1: 2 to the nature, show that the valve opening time decreases 10 or more times compared to existing structures, and this makes it possible to significantly increase the service life.

The drive power in the proposed valve design is less than in existing structures. This is due to the fact that there is a moment on the shaft of the valve due to the absence of counter-load, and the engine accelerates in favorable conditions, since during this period the elastic element gives it its previously accumulated energy

The application of the proposed design makes it possible to increase from

service equalizing valve up to 21 months. The expected efficiency of a year for one blast furnace is 1550 rubles.

Claims (1)

5 Formula of Invention The equalizing valve of a blast furnace, including a housing with a saddle, a hinge plate hinged to a lever mounted on a shaft mounted on two bearing supports, drives the shaft to rotate in order to increase the service life and simplify the structure, the valve is provided with a collar mounted on the shaft coaxially with it, inside of which there is a cam with two rollers symmetrical about the shaft axis, fixed to the levers, one ends of which are spring-loaded, and the other are hingedly connected to the race rotary drive crank mechanism. Sources of information taken into account in the examination 1, Ddenmen equipment. Kata dog, 4 11, M ,, 1975, 2, - Copyright certificate of the USSR No. 18.0205, class, C 21 B 9/12, 1961, fj Tl + i Fe1, / // - // 6-f /, FUG. I f (pyt.J gff r // eight rr fff