SU975805A1 - Charge cut-off valve of charging apparatus of blast furnace - Google Patents

Description

The invention relates to ferrous metallurgy, in particular to the equipment of blast furnaces.

Known charge-discharge valves of a blast furnace charging device with 5 electromechanical actuators, consisting of a housing with a seat mounted in it in contact with a harrel pivotally connected to a lever fixedly mounted on a shaft, supported by U bearing supports, fitted with a counterload rigidly connected to it and kinematically connected with rotational drive I].

The disadvantage of such devices is ^{, 5 the} slow movement of the valve in the process of opening the valve, because of which its main parts (tarpie, lever, body), being a long period of time in the flow of moving charge material, wear out rapidly and fail quickly. In addition, in the process of opening the valve, 2

for 25–30% of the time of complete emptying of the bunker (valve opening time is 3-4 s, and the time of emptying of the bunker is 12-16 s), the material flows unevenly through the valve flow area, i.e. volume flow varies from zero (with the valve closed) to maximum (with the valve fully open). Ego leads to the fact that when laying the distribution element of the charge on the furnace's top, the circumferential milling uniformity is disturbed, which worsens the technical and economic indicators of the blast furnace smelting.

The presence of a counter-load on the shaft increases the drive power, the dynamic loads in the valve elements and the metal structure.

The closest to the invention according to

technical essence and achievable

effect is a valve comprising

the plate coming into contact with the saddle and "

pivotally connected to the lever, fastened3 975805

mounted on a shaft mounted in bearing supports and equipped with a hinged four-wheel drive associated with a rotational drive [2 ^.

In the well-known valve, due to note _{5 of the} lever-torsion balancing, the shock loads that occur during its operation are reduced, but the valve opens slowly, which has a negative effect on the uniformity of movement of the charge flow from the bunker to the distribution element, and consequently on Kargin distribution of the mixture on the surface of the blast furnace. At the same time, ₁₅ valve components are also subject to intensive wear by the charge stream.

The aim of the invention is to increase the life of the valve and reduce the negative impact of its closure member in the flow of charge due to reduced opening ²⁰ sheniya time.

This goal is achieved by hem that a valve including a harrel pivotally connected to a lever fixedly mounted on a shaft mounted in bearing ²⁵ 'bearings and having a hinged four-wheel drive connected to a rotational drive, is provided with a cylindrical driving drum installed coaxially with the shaft, and the quadruple has ί 30 rollers in contact with the working surfaces of the drive drum, while on the working surface along its perimeter there are two cavities and a recess with a spring-loaded 35 installed in it

a shoe connected with a bar ’ban. ’

In addition, in order to accurately stop the spruce in the open position of the valve, the working surface of the shoe has a hollow.

Due to this, in the closed position of the valve, a reliable fixation of the harrel in the upper position is ensured, and at _{45 the} moment of opening it moves at a speed equal to the speed flowing out of the “charge” hopper without throttling the flow.

At the same time, the impact time of the abrasive flow on the garel is minimized, and the volumetric flow rate of the material through the valve flow area changes from zero to maximum almost instantly. Ego makes it possible to increase the service life of the main parts of the valve and eliminate throttling of the flow of charge ^{55 by the} gel, which will significantly reduce the negative effect of the valve on the flow of the charge flowing from the bunker.

FIG. I shows the proposed exhaust valve; in fig. 2 is a view A of FIG. "1; in fig, 3 is view B in FIG. one; on ^! Fig, 4 is a diagram of the interaction of power factors that occur in the valve elements.

The valve consists of a body I, a seat 2 mounted into it, with which the plate 3 contacts, pivotally connected to a lever 4 fixedly mounted on the shaft 5, supported on bearing assemblies 6 and passing through the gland seals 7,

The shaft 5 is connected with a hinged crank crank 8 - connecting rod 9 - rocker arm 10, the hinges of which are provided with rollers 11 and 12 in contact with the working surface of a cylindrical driving drum 13 mounted coaxially to the shaft 5 on bearings 14 and having two curved cavities a and b on the working surfaces ", and the notch in which the shoe 15 is installed, one end of which is connected to the drum 13 by means of the hinge 16, and the other end is spring-loaded by the elastic element 17 (springs or springs). The drum 13 is rigidly connected to the gear wheel 18- connected with a rotational drive 19 (consisting, for example, of a gearbox, an electric motor, and a steering wheel controller).

Curved depressions a and b are located on the drum 13 so that one of them (a) roller 12 comes in when roller 11 pushed in the process of closing the valve by shoe 15 will pass the upper dead center, i.e. cross the AC line passing through the center of the drum and the axis of the lower fixed joint (Fig. 4).

In the second trough (ί), the roller 12 should enter the initial period of valve opening. The stiffness of the elastic element 17 and the shape of the working curve of the surface of the shoe 15 must be chosen so that during the opening of the valve the kinematic energy accumulated by the plate – lever – shaft system is extinguished due to the deformation of the elastic element, and the said system must stop. In order to avoid platelet oscillations in the open position of the valve, the working surface of the shoe is made with a curved depression.

To reduce the impact of the shoe 15 on the drive drum 13, with

975805 6

the return of the first to its original position by the elastic element 9, between these parts is installed rubber-metallic (or other type) shock absorber 20.

The proposed valve exhaust valve 5 operates as follows.

In the closed position of the valve, the rollers 11 and 12 are on the cylindrical surface of the drive drum 13, and the shoe 15_ in the lower predetermined position. At the same time, the valve cannot open under the action of the weight of the charge and parts, the hook as the moment No. on the shaft (Fig. 4) created by the pressure of the charge on the garel and the weight of the parts is balanced by the moment of the four star I (Fig. 4) , The force I will exist as long as the segment AC <AC ⁽ (C ^{g is the} "dead" position of the center of roller II, that is, in this position the side of the AC speaker of the rectangle ABC is maximal).

To open the valve, the drum 13 is rotated counterclockwise by means of the actuator 19, while the roller: 12 enters the cavity, thanks to 25 _; Mu segment of the AU increases, allowing the 'roller 11 to move the position C ⁴ . After that, the drive will not interfere with the movement of the gareli, and under the action of Mohmanga, almost instantaneously, synchronously with the flow of the charge flowing from the bunker, will turn through a given angle (90-110 °). During this period, the roller 11 will come into contact with the curvilinear working surface of the shoe 15 and, moving along it, will deform the elastic element * · :, ment 17. After the garrel accumulated by the system - the lever - the four star energy will be spent on the deformation of the elastic element 16, she will stop. Due to the presence of the working surface of the shoe 15 of the curvilinear cavity during the period of stopping the garel in the open position, the roller 11 will go into it, which will prevent the garel system from oscillating - *

lever - shaft - chetyrehtvvennik.

To close the valve of the drum 13, the actuator 19 is also rotated counterclockwise. In this case, the shoe 15, acting on the roller 11, will return the system to its original position (the valve is closed). At the approach of roller II

to the position of SCfig. 3) the roller 12 will go into the depression ΰ, after which the roller 11 will pass the position C and after the roller 12 exits the cylindrical working surface of the drum 13 will take the initial position C (the valve is closed).

Consequently, the use of the proposed design of an inhaled valve poses, will increase the service life> n to exclude the negative impact of its parts on the formation of an equal flux of material flowing out of the bunker.

The economic effect of using the invention on a single 2000 m® furnace will be 3,400 rubles. in year.

Claims (2)

Claim 1. Shikhgotstechnoy valve boot device blast furnace, containing Garrel, pivotally connected to a lever, fixedly mounted on a shaft, installed in the bearing supports and having a hinged four-wheel bearing, connected with a rotation drive, ohm and child with the st heme, chgo, in order to increase the service life and reduce the negative impact of the valve organ on the charge flow by reducing its opening time, it is equipped with a mouth *: a new shaft coaxially with the shaft with a driving dirindrical drum, and rollers, which are con- tacting with the working surfaces of the drum, while on the working surface of the drum along its perimeter there are two cavities and a notch with in it is a spring-loaded shoe, a ball, which is nirno connected to the drum. I 2. Valve on π. 1, that is, that, in order to precisely stop the plate in the open position of the valve, the working surface of the shoe has a hollow.