SU1397380A1 - Arrangement for pneumatic transport of loose material - Google Patents

Abstract

The invention relates to the mining industry and can be used to pneumatically transport backfill materials. The purpose of the invention is reliability. A device for pneumatic transportation of bulk material contains a hopper feeder 1 with a discharge pipe 3, an air distribution chamber 4, which forms an annular ejector with a sliding double wall H 75 It’s 7 V -C4 confuser 6. The outer wall of the confuser 6 is made of elastic, and the inner wall is made of longitudinal-- 1ShH sliding plates. Inside the confuser, a spacer cylinder 15 is installed with the possibility of axial movement from the actuator I1 and contacting the inner surface of the confuser 6. The bulk material is supplied by gravity from the feeder hopper 1 to the nozzle 3, and simultaneously compressed air is fed into the air distribution chamber 4, which passes between the confuser 6 surface and by the walls of chamber 4, the material is being expelled in the transport direction. The magnitude of the heel is controlled by changing the annular gap between the confuser 6 and the chamber 4 by expanding or narrowing the sliding confuser 6 by the spacer cylinder 15 moving from the drive 17. The device avoids blockages of the pipeline with the transported material. 1 hp f-ly, 6 ill. H It s 7 V -C4- and S (L with with so with 00 o

Description

The invention relates to the mining industry and can be used for pneumatic conveying of backfilling material through pipelines.

The purpose of the invention is that the expansion is endowed with

FIG. shows a device for the pneumatic transportation of the material beam bundle to phi: g, 2 - view A in figure 1; figure 3 - sliding two wall confuser; in FIG. 4, node I in FIG. 3; Fig, 5 - section bb on ug, 4; in FIGURE is a diagram of an automatic control unit for a confuser.

The device consists of a bunker 1 with a vibrator 2 and a discharge pipe 3, an air distribution chamber 45 connected to the compressed gas, a transport pipe 5, an expandable junction wall 6 of the drive 7 and pneumatic automation system 8. Air distribution chamber 4 with discharge pipe 3 and confuser 6 form an annular ejector. The sliding confuser 6 consists of a set of longitudinal plates 9 fixed by means of hinges 10 at the base 11 of the annular nozzle and connected by an annular spring 12 in the smaller base 13 of the nozzles, respectively, while the surface of the confuser 6 is an elastic sleeve 14 o The drive mechanism 7 consists of a spacer cylinder 15 with flange 16 and control cylinders 17. The air distribution chamber 4 is connected to the drive mechanism 7 by a flexible diaphragm. The pneumatic automation system 8 (in the case of this case the described pneumatic automation system is described, but any other automation scheme can be used) is connected to the drive mechanism 7 via pneumatic centers 17, the piston cavity of the latter being connected to the pneumatic valve 18 outlet, the control chamber of which is connected to the pneumorele outlet 19. The first control chamber of the pneumorele 19 communicates with the output of the comparison element 20, the first control chamber of which is connected to the transport nipple 5, and the second control chamber - with the output of the admitter 2 1 pressure, the rod end of the pneumatic cylinders 17 through the pneumatic valves 22 communicates with the outlet of the pneumorel 23, the second control chamber communicates with the outlet of the pneumorelle

19. Outlets of pneumorel 19 and 23, pneumatic valves 18 and 22, comparison element 20, pressure setting device 21, as well as 2 first control chamber of pneumorele 23 communicate with the air supply pipe.

Coming into the bunker-feeder 1 filling material under the action

The forces of gravity, the vibration effect of the vibration generator 2 and the ejection, together with the flow of air ejected from the atmosphere, flow to the mouth of the ejector. a nozzle consisting of a ram of the moving confuser 6 and a shell of the air distribution chamber 4 connected to the air supply pipe, from where it is transported to the transport nozzle 20 5 through pneumatic conveying air through it. When this pneumorel 23 opens,. . and pneumorel 19 closes. The signal from pneumorel 23 is supplied to the control chamber of pneumatic valve 22, and compressed air is supplied to the rod end of pneumatic cylinders 17, the pistons of which move and act on the drive mechanism 7, cylinder 15

 leaves the confuser 6, while the profiled longitudinal plates 9 fixed by means of hinges 10 at the base 11 of the annular nozzle are compressed under the action of an annular

35 of the spring 2 and the flexible elastic sleeve 14, change the angle of inclination of the generatrix of the confuser 6 to its longitudinal axis (the angle of inclination in this position is maximum).

40 I

During pneumatic transport of the filling material in the transport port 5, it is necessary to maintain a constant volume ratio of air.

 and transported material. If the filling material is not uniformly fed into the bunker-feeder 1, as well as real fluctuations in the pressure and flow rate of compressed air in the air supply line, they can be formed by blocking transport

nozzle 5, pressure setting device 21 -. gives the specified maximum pressure of the pipe 5 to the second pipe CJ. measure of the reference element, and the first control chamber of the latter is supplied with the actual pressure in the transport nozzle 5. With increasing pressure in the transport nozzle 5,

caused by an obstruction, above the one set by unit 21, the signal from the reference element 20 is supplied to the first control chamber of the pneumoregle 19. The latter opens and sends a signal to the control chamber of the pneumatic valve 18 and at the same time to the second control chamber of the pneumorele 23, which collapses. The control chamber of the pneumatic valve 22 is connected to the atmosphere, and compressed air is supplied to the control chamber of the pneumatic valve 18. At the same time, the piston cavities of the pneumatic cylinders 17 are filled with compressed air, the pistons move in the opposite direction and act on the drive mechanism 7 for displacing the cylinder 15 and thereby expanding the confuser 6, reducing the angle of inclination of the confuser forming surface to the longitudinal axis to a minimum. In this position, the annular nozzle with a constant flow rate and pressure of compressed air in the air supply pipe at the slit of the annular gap increases the total air pressure (velocity head by reducing the annular slit area) and purges the nozzle 5 intensively until the pressure in the latter is will become lower (or equal to) the pressure set by the unit. After that, the sliding confuser 6 is brought to its initial position and operates in the normal mode of pneumatic conveying of the filling material.

The proposed device almost completely eliminates the formation of blockages in the pneumotransport pipeline due to the possible uneven supply of the filling material or from real pressure fluctuations and compressed air flow in the air supply line and ensures continuous operation in automatic mode.

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Claims (2)

1. Device for pneumatic transportation of bulk material 0 containing a feed hopper with a discharge nozzle, a transport nozzle placed coaxially with the discharge nozzle and communicating with a source of compressed gas and an air distribution chamber adjacent to the transfer nozzle, enclosing the unloading nozzle in the area of its output end with the formation of an annular ejector between them, so that that, in order to increase reliability, it is equipped with a spacer cylinder mounted in the air distribution chamber, coaxially covering the output end of the unloading atrubka axially movable by a drive spanning the annular tapered clearance, the spacer cylinder with the possibility of contacting them with its inner 0 by a double-wall confuser with an elastic outer wall and an inner wall made of longitudinal plates hinged on a larger base of the confuser with the possibility of overlapping their lateral longitudinal edges and an annular spring placed at the smaller base of the confuser between its outer and inner walls with covered 0 last. 2. The device according to claim 1, characterized in that it is equipped with a vibrator, mounted by a feeder under the hopper. five m  vH FIG. 2 FIG. d Air