SU1562781A1 - Automatic gralunometer of loose materials - Google Patents

Abstract

The invention relates to a measurement technique, is intended to determine the particle size distribution and moisture content of bulk materials and can be used in the construction and other industries. The purpose of the invention is to improve the measurement accuracy by increasing the drying efficiency of the analyzed material in the automatic mode. The device contains a weighing hopper-feeder, a second weighing sensor, a pneumatic cylinder, a flexible cable, four inclined platforms with heating elements installed in the bunker-feeder, a latch, a dryer, a drying vibrator, a roar, a vibrating vibrator, a weighing bunker with a gate, the first and second intermediate valves bunkers with closures, the first weight measuring sensor, a drying bottom heating element, a control unit, electronic keys, memory blocks, a comparison unit, inverters, adders, division blocks, electronic keys, he first and second recording devices. An increase in the measurement accuracy is achieved due to the additional use of heating elements with an appropriate algorithm of the device operation. 1 il.

Description

The invention relates to a measurement technique, is intended to determine the particle size distribution and moisture content of bulk materials and can be used in the construction and other industries.

The purpose of the invention is to improve the measurement accuracy by increasing the drying efficiency of the analyzed material in an automatic mode.

The drawing shows a functional granulometer scheme.

The particle size meter contains a weighing hopper-feeder 1, a second weighing sensor 2, a pneumatic cylinder 3, a flexible cable C, four inclined platforms with heating elements 5, a latch 6, a drying 7, a vibrator 8 drying, a roar 9, a vibrator 10 of a roar, a weighing bunker 11 with a gate , the first intermediate hopper 12 with a shutter, the second intermediate hopper 13 with a shutter, the first weighing sensor 1A, the heating element 15 of the drying floor, the block

N9

00

16 controls, electronic keys 17-23, memory blocks 24-28, comparison block 29, inverters 30-33, adders, dividing blocks, electronic keys k2-kk, first and second A6 recording devices.

The particle size meter works as follows.

Weighing hopper feeder

1 in the initial position is suspended using flexible cables k on the weight measuring sensor 2. On command from the control unit 16 through the key 17, the signal from the weighing sensor

2, in the form of a voltage proportional to the initial mass (M0) of the weighing hopper feeder 1, enters the memory block 2k and is stored there. After filling the weighing bin feeder 1 with the test material, a command from the control unit 16 via the key 18 signals from the weighing sensor 2, which is proportional to the total mass (2L.M) of the weighing bin feeder 1 of the material under investigation, is fed into the memory block 25 and stored there.

The CARE of the adder 36 receives signals from the 2k memory block: through the inverter 30 a signal (-M0), and from the memory block 25 a signal (2IM). At the output of the adder 36 (ZM - M0 ZM) S i. signal proportional to the initial sample mass of the material under study. The first input of the comparator unit 29 receives a signal from the weighing sensor 2, which is proportional to the total mass () of the weighing bunker-feeder 1 and the material under study, which is currently in time (c) in the weighing bunker-feeder 1. And at the initial moment of time (t0 a) signal (LM). The second input of block 29 compares the signal (M &) from the memory block 2k. If in the weighing hopper 1, at a given time (where T is the emptying time of the weighing hopper 1) there is a certain amount of material under investigation, then at the output of the comparator unit a signal greater than zero is generated. This signal, via a command from the control block 16, passes through the switch 19 and gives the permission command to execute the first program by the control block 16. According to this program, control block 16 sends a co-1

a mandrel on the pneumatic cylinder 3, after the operation of which the weighing hopper-feeder 1 is lowered into the drying 7, thereby unloading the weighing sensor 2. Then, at the command of the control unit 16, the latch 6 is triggered, fixing the weighing hopper-feeder 1 in drying 7. Next

on command from the control unit 16, the vibrators 8 and 10 simultaneously turn on the wet material under the action of vibration, pouring down inclined surfaces with heating elements 5 located in the weighing hopper 1, undergoes preliminary drying and then gets to the bottom of the drying heated element 15 "Here the material is transported by means of a vibrator 8 to the outlet of the drying 7. In the process of moving with vibration, the material under study is dried. The dried material enters screen 9 with two 5 m screens. The roar 9, driven by the vibrator 10, scatters the dried material into three fractions - coarse, medium, fine. The last (small) fraction immediately enters the weighing bin 11 with the shutter. The medium fraction enters the intermediate bunker 12 with a shutter, and the coarse fraction enters the intermediate bunker 13 with a shutter. After the material is vibrated by a command from the control unit 16, the vibrators 8 and 10 are turned off. The material is transported in the drying 7 and the material is dispersed in the screen 9. Then, after the command from the control unit 16, the latch 6 triggers, releasing the weighing bin 1 in the drying 7 After that, on command from control unit 16, pneumatic cylinder 3 is activated, transferring the weighing hopper feeder 1 to the weighted position on the load cell 2. The last command of program 1 is to reset it to its original state not If the output of the comparator unit 29 continues to find a signal greater than zero, which means that there is material in the weighing hopper-feeder 1, then at control unit 16 the key 19 passes the command to re-execute the first program. If on

the output of block 29 comparison psce ochei

In the run cycle of the first program, a signal is formed less or less.

0

five

0

five

0

equal to zero, which means emptying the weighing hopper-feeder 1, then this signal, when commanded by the control unit 16 to pass through the key 20, gives the command permission to execute the second program by the control unit 16.

According to this program, control unit 16 signals the simultaneous activation of vibrators 8 and 10. Under the action of vibration, the remaining material is transported to screen 9, where it is dispersed into three fractions: coarse, medium and fine. After two minutes of operation of the vibrators 8 and 10, they are switched off by a command from the control unit 16. The sample of the material under investigation is dried, completely screened and located in the corresponding bunkers: a fine fraction of mass mj in the weighing bin 1 1 with a shutter, a medium fraction of mass t in the intermediate bunker 12 with a shutter, and a large fraction of mass mj ,. in the intermediate hopper 13 with a shutter. The weighing bin 11 is suspended on the weighing sensor 1. According to the signal from the control unit 16, via a switch 23, the signal from the weighing sensor 14 in the form of a voltage proportional to the mass of pc passes into the memory unit 28 and is stored there. Then the control unit 16 sends a signal to open the shutter of the first intermediate hopper 12, and an average of 1 fraction gets into the weighing bin 11 in addition to mi

t

2

those. mass collected in bunker 11

(t, + tg). Further, according to the signal from the control unit 16, via the key 22 from the weighing sensor 14, a signal proportional to (m + n2) passes into the memory unit 2 and is stored there. Then the control unit 16 sends a signal to open the shutter of the second intermediate hopper 13 and a large fraction enters the weighing bunker 11 in addition to t)

(m 4 +

those. in the bunker 11 the mass is collected + t g + - the total mass

t, t

dried test material. This signal, via a command from control block 16, passes through key 21 and is stored in memory block 26. In order to determine the granulometric composition of the material under study, it is necessary to isolate the signals t and pc. This is done as follows. From block 28 through the inverter 32, the signal (-t () goes to the adder 34, where the signal (t, + tu) also comes from the memory block 27, which means that the output of the adder, 34 is the signal (t, + t - t, t4). The adder 35 comes from the memory block 27 through the inverter 31 signal (-t, - t), and from the memory block 2b - the signal

+ te), thus, ka

(t,

+ t

five

0

five

0

five

0

five

(t, +

the output of the adder 35 signal + m 5 m t -2 nij). From blocks 28, 34 and 35, the signals m ,, m2, m3 are received respectively at blocks 38-40 of dividing, the second outputs of which from memory block 26 receive a signal (Z.m). From the outputs of these dividing units in series through the keys 42-44, turned on by control unit 16, signals proportional to the percentage content of each fraction are fed to the input of the first recording device 45. The moisture content of the material is determined as follows. The input of the adder 37 receives signals: from the output of the block 36, the summation of signals, proportional to the mass of the material under study, from the memory block 26 through the inverter 33 signal (-21 tons), proportional to the total (the mass of all fractions of the dried and cross-sectional studied material, such Thus, at the output of the adder 37, a signal (5LM -21t) proportional to the initial amount of moisture in the material under study. From the adder 37, the signal (21m-2.t) goes to the first input of dividing unit 41, to the second input of which from the output of adder 36 (ZM). Next with Exit unit 41 dividing the signal (W), is proportional to the humidity of the material arrives at the second recording device 46,

Claims (2)

1. Automatic granulometer of bulk materials, containing a weighing bin with a shutter, drying, equipped with a vibrator, a screen and a vibrating screen, the first weighing sensor connected to the weighing bin, the first and second intermediate bunkers with shutters, the first and second recording devices and the control unit and the control inputs of the gates of the measuring bin, the first and second intermediate bins, as well as screening and drying vibrators are connected to the corresponding control outputs of the control unit, characterized in that, in order to improve measurement accuracy by increasing the drying efficiency of the analyzed material in automatic mode, the particle size analyzer also contains a pneumatic cylinder, second measuring sensor, weighing hopper-feeder, equipped with heating elements installed at an angle to the direction of movement of the material, and made with the possibility of connecting to the dryer oschyu latch and bottom heating element drying, wherein pnevmotsi-i connected to the cylinders through the second load cell 2 with vesoizmeritel- nym hopper-feeder, and control inputs of the pneumatic cylinder, the latch and all heating elements are connected to the respective control outputs of the control block 2 2. The particle size analyzer according to claim 1, which means that the device additionally contains the first - the tenth keys, the first - the fifth memory blocks, the first - the fourth inverters, the first - the fourth adders, the first - the fourth dividing unit as well as the comparison unit, with the output of the second weighing sensor connected to the inputs of the first and second keys and the first input of the comparison unit, the output of which is connected by the PC inputs of the third and fourth keys, the inputs of the fifth - seventh keys are connected to the output of the first weighing sensor, the outputs of the first, second, fifth, sixth and seventh keys are connected to s 0 five about five 0 responsibly with the inputs of the first to fifth memory blocks, the outputs of the first memory block are connected to the second input of the comparison unit and through the first inverter to the first input of the third sum of the matrix, the second input of which is connected to the output of the second memory block, the output of the third memory block is connected to the first inputs of the first, second and third dividing units, the first input of the second adder and through the fourth inverter to the first input of the fourth adder, the output of the third adder is connected to the second input of the fourth adder and the first input is the fourth About the dividing unit, the second input of which is connected to the output of the fourth sum of the torus, and the output to the first registering device, the output of the fourth memory block is connected to the first input of the first adder and through the second inverter to the second input of the second adder, output of the fifth memory block connected to the second input of the first division unit and through the third inverter to the second input of the first adder, the outputs of the first and second adders are connected respectively to the second inputs of the second and third division blocks, the outputs of the first, second and third About the division blocks are connected respectively to the inputs of the eighth to tenth keys, the outputs of which are combined and connected to the first registering device, while the control inputs of all the keys are connected to the corresponding control outputs of the control unit, and the outputs of the third and fourth keys are connected respectively to the first and the second control inputs of the control unit.