SU1310052A1 - Hydraulic equalizing device for working stand - Google Patents

Abstract

The invention relates to the field of rolling equipment {and, especially, to balancing the structure of the rolls of working stands of rolling mills. NR.CHu invention - increase in the number of mines of the rolling mill 1: cho | to prevent the screw gears of the pressure mechanism and reduce the duration of pauses during rolling, raising the roll 3, high-pressure liquid will flow from the main cylinder 5 of the accumulator to the balance cylinders 1. When the roll is lowered, a portion of the liquid from the balance cylinders will flow into additional cylinders 6 battery, and then - to drain, mine the main cylinder, by changing the pressure in the additional cylinders 6, it is possible to maintain a stable pressure in the balancing cylinders 1 on the mini At the lower level, it reduces the pressure on the pressure screws and extends their service life. In addition, the static moment on the screws is reduced, which is proportional to the re-equilibration force. This contributes to a reduction in the duration of pauses and, as a result, an increase in the mill productivity, 1 sludge. (L С // ;;;; g

Description

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The invention relates to rolling equipment, advantageously to balancing devices of the rolls of working stands of rolling mills.

The purpose of the invention is to increase the productivity of the mill by increasing the durability of the screw gears of the pressure mechanism and reducing the duration of pauses during rolling.

The drawing shows a diagram of a hydraulic balancing device.

The proposed device consists of balancing cylinders 1, the plungers of which, through the system m 2 and the cushions of the roll 3, interact with the screw transmissions of the pressure mechanism 4, the cargo fluid accumulator, which includes the main hydraulic cylinder 5, additional hydraulic cylinders 6 and the load 7, the pumping station 8. Balancing cylinders 1, the main cylinder 5 of the fluid accumulator and the pump station 8 are interconnected by a system of connecting pipes 9. Additional cylinders 6 of the cargo fluid reservoir of pipes through the conduit 10 through the liquid distributor I1 is connected to the drain line 12, on which the pressure valve 13 is installed, and to the pipeline 14 connected to the connecting pipe system 9, on which the reducing valve 15 is installed,

The device works as follows. I

When the roll moves upward, the liquid distributor 11 connects the pipeline 10 to the drain line 12 and the liquid from the additional cylinders of the fluid accumulator 6 goes through the pressure valve 13 to the drain line. In the additional cylinders 6, the pressure of the fluid (P) is maintained, determined by the setting of the valve of pressure 13, the fluid 2 from the main cylinder, the accumulator 5 is displaced into the balancing cylinders, in which a pressure (P ,.) is created equal to

J

RF PC, - KPv, - uP,

but

de r ..

R

(one),

fluid pressure in the main cylinder of the battery 5, provided that

the value of n ;; OITOJTHH- trilnyh cylinders 5 is zero (P, 0);

the power of the weight of the battery Grulya 7; the area of the plunger cylinder 5; - the ratio of the areas of the plungers of cylinders 6 and cylinders 5;

F is the area of the plungers of additional cylinders 6;

iR - pressure loss in P

 piping system 9 when moving roll up.

When the Bini3 roll moves, the liquid distributor 11 connects the pipeline 10 to the pipeline 14.

In this, the fluid displaced from the counterbalancing cylinders 1 partially enters the main cylinder of the accumulator 5 through the connecting pipe system 9 and partially into the additional cylinders 6 through the reduction valve 15 through pipelines 14 and 10. Pressure in the additional cylinders 6 (Pp) is determined by adjusting pressure reducing valve 15. Pressure in balancing cylinders

(RD) is determined by the dependence j5 O

Pj P „- KR + yP.

R

(2)

where Ci P is the pressure loss in the connecting pipework system 9 when the roll is moved down. In general, during the operation of the device in question, the next flow of working fluid occurs. The high pressure fluid from the main cylinder of the battery enters the counterbalance (and the cylinders move upward, and its

the flow rate per cycle is equal to the working volume (V) of the balancing cylinders. When the roll moves down, some of the liquid from the balancing cylinders enters the

additional cylinders of the accumulator, and then - on the drain, without returning to the main cylinder of the accumulator. This determines the presence of a loss of high-pressure fluid at 13

boto device The magnitude of these ggother1, (uVp) per cycle is equal to

  V K / (1 + K).

(3)

These losses must be compensated for by the operation of the pump station 8.

Analysis of expressions (1) and (2) shows that, by changing the pressure of P. and Pp, it is possible to maintain pressure and balance cylinders at the minimum necessary level when the roll moves both up and down. Considering that the known designs of pressure valves and pressure reducing valves have a very simple tuning system, the solution of the problem is not difficult.

Stabilizing the pressure in the balancing cylinders and maintaining it at the minimum necessary level allows one to have a stable force of small magnitude acting on the screw transmissions of the pressure mechanism during periods of their operation. This contributes to the service life of the helical gears. At the same time, the static moment on the axles of the screws, whose magnitude is proportional to the rebalancing force, decreases. Reducing the static moment on the axles of the screws helps to reduce the duration of pauses for the swapping of the roll and, as a result, increase the productivity of the mill.

Indeed, many of the pressure mechanisms, in combination with which hydraulic balancing devices of the rolls are used, work in the intermittent mode with small values of one-time movements of the roll. Under these conditions, the basis of the Editor, And, Shvydka Zakau 1819/7

Compiled by G.Rostov Tehred V.Kadar

Corrector

Circulation 481 Subscription

VNII11I State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d. A / 5

Production and printing company, Uzhgorod, Projecto st., 4

524

The duration of pauses for the swapping of the roll is the acceleration time and the deceleration time of the pressing mechanism.

With a decrease in the static torque on the axis of the screws, the total acceleration and deceleration time of the pressure mechanism decreases. This confirms the conclusion about the reduction of pauses for the rearrangement of the roll and the increase in productivity of the mill.

Claims (1)

Invention Formula The hydraulic balancing device of the rolling stand, which includes balancing cylinders, interacting through the system with pullers of the roll and screw and gears of the pressure mechanism, the fluid accumulator cylinder with the cargo, the system of connecting pipelines and a pumping station, characterized in that by increasing the durability of the screw transmissions of the pressure mechanism and reducing the duration of the pauses during rolling, it is equipped with installed in parallel to the main cylinder of the hydroaccumulator and connected-1i to the system of connecting pipelines and to the drain line through the liquid distributor by additional hydraulic cylinders, the loads of which are rigidly connected to the cargo of the main cylinder, while the pressure valve is installed on the drain line and to the system of connecting pipelines, - pressure reducing valve. Proofreader L. Pilipenko