SU1440736A1 - Feeder for loose raw mixtures - Google Patents

Abstract

And the acquisition relates to the industrial use of construction materials, can be used for volumetric dosing of the raw mix in installations for the continuous formation of building materials and improves the accuracy of the flow rate control of the loose raw mix. It contains bunker 1, chutes 2, 3, dampers 4j 5 of primary and secondary dosing, additional valve 6 with servo drive 7, compacting roller 8, rod 9, pressure sensor 10, conveyors 11 and 14. 3 pcs. city /

Description

Of ex. The industry refers to the industry of building materials and can be used for volumetric dosing of the mixture in installations for the continuous formation of building products, for example, heat insulation of semi-dry mixtures based on extra lightweight aggregates.

The purpose of the invention is to improve the accuracy of controlling the flow of raw mixtures with varying molding properties.

Figure 1 presents the feeder, a general view; Fig. 2 is a servo control flowchart; figure 3 is a view of And figure 1.

The feeder contains a hopper 1 with two chutes 2 and 3, gate valves 4 and 5 of the primary and secondary dosing. A sliding valve 6 with a servo drive 7 is mounted on the gate valve 5. A sealing roller 8 is located between the chutes, the axis of which is connected to the pressure transducer 10 by means of the rod 9. The height of adjustment of the roller 8 above the conveyor 1 1 is carried out by means of an adjustable cable length 12 connected to the suspension arm 13. The feeder also has a sealing conveyor 14.

The control circuit of servo drive 7 contains a compensating device 15 that provides zero setting, a secondary device 16, registers a pressure value, a comparison element 17, an additional valve 6 position sensor 18, an amplifier 19, and a time relay 20 (Fig. 2).

The additional flap 6 is raised and lowered relative to the secondary dosing flap 5 by means of rails 21 fixed on the flap 6 and gears 22. The nominal height above the belt 11 is controlled by the steering wheel 23, on the axis of which the gears 24 are engaged with the rake 25 mounted on the valve 5 (FIG. 3).

The feeder works as follows.

In the bunker 1, a reference raw material mixture with specified shape properties is poured.

The height h, the primary metering valves A, the height of the roller 8 and the height h of the controlled valve 6 are set to the nominal design position by means of an assault shaft 23 by means of the rack 21 and gear 22. In the process of forming the products using a compensating device 15 set to zero. Further, the process of controlling the flow rate of the mixture when changing yu (their molding properties occur automatically.

When the compactibility of the mixture decreases, which can be caused by a change in the bulk density of the aggregate, the height of the mixture filling into the bunker, mechanical compaction of the mixture when transferring it from the mixer to the bunker, and other reasons, the force of the mixture on the roller 8 changes. pressure sensor 10. Magnitude

force can be determined by empirical formula

0

Fx A

(-Y -

P.

i:

(f-f-1

-e

-BUT - ,

i

five

0

five

h and h |

0

(one)

where F / S is the force exerting influence on the roller, kgf; A is the coefficient dependent

on the diameter of the roller and the difference h - hj;

- the thickness of the packed and compacted roller mixture, respectively, cm; Hm is the coefficient of compaction of the mixture (actual); (f - the density of raw,

t- is the density of the filling of the mixture, n „o

coming from estrus 2,

g / cm

In the event that the output control parameter is the compaction pressure of the mixture, the adjustment of the comparison device 27 is carried out taking into account the ratio

(hj-ihilhii. h jV

IZap (2)

55

l (-U -) -.

where P. is the actual compaction pressure of the mixture, Sha;

v l h, h, h + bs-ho.

3

The effect of the mixture on the roller 8, kG; CoE (} x}) is in formula (1);

bulk fill thickness of the mixture leaving the feeder;

hj is the thickness of the mixture layer, after which the sealing conveyor 14;

Gy (-.eleverability ratio

mixtures; derived with regard to dependency (1)

As can be seen from relation (2), when the force F is changed at constant

h values

2 f

And God, for the condition of PM const it is necessary to change

14A0736

No, it is necessary for the mixture to pass from the roller 8 to the controllable 1SH-gate valve b.

The economic effect of using the feeder is achieved by reducing by 20-30% the excess density of the thermal insulation products.

Claims (1)

Formula A feeder for bulk raw materials containing a hopper located above the conveyor, a compaction roller with a suspension lever, a primary and secondary metering damper, characterized in that, in order to improve the accuracy The change in h is automatic. So with an increase in the force F of the mixture effect, the value of the sigcat 8 increases. . the value of h due to the raising or lowering of the flow rate of the bulk raw mixture, the adjustable valve 6 can. It is supplied with a throat of adjustable length, one end of which is connected to the suspension arm, the other is spring-loaded relative to the hopper, a pressure sensor 25 connected to the axis of the roller, an additional valve with a servo drive located on the secondary metering valve, an additional valve position sensor and 30 by a servo drive control circuit Bbt-filled in the form of a compensating device, a secondary device, a reference element, an amplifier and a time relay, the pressure sensor being connected to the first input of the reference element through a compensating device and a secondary position sensor dampers as well 40, the output of the reference element through a serially connected amplifier and time relay is connected to a servo drive. from the pressure sensor 10 through the compensating device 15 and the secondary device 16 to the first input of the comparison element 17, to the second input of which a signal is received from the sensor 18 of the position of the additional damper. When a signal appears at the output of the reference element, the angle of rotation of the servo drive 7 increases, which raises the damper 6 to a height h in accordance with equality (2). The valve 5 is in a stationary position. The system transport lag is eliminated by setting the time delay relay 20, which delays the signal for a period of time35. 23 Faye. 2 Bud / J / / -gu rL 25 .22