SU800671A2 - Apparatus for automatic monitoring of material weight in hopper - Google Patents

Description

The invention relates to a weighing technique, in particular, to devices for determining the weight of a material in silos without directly weighing them.

According to the main author. St. No. 301554, a device for automatically controlling the weight of material in bunkers is known, which contains load cells on the loading and unloading conveyors, sensors for moving the belt of the loading conveyor, position sensors for the dumping cart, switching circuits, keys, shift registers, and reversible counters 15 [1].

The known device does not provide the required accuracy, since when you move the dropping cart forward and moving from ι-th to (i +1) -m 20 bunker, it is possible to double the weight impulse contained in the senior discharge of the shift register. This is explained by the fact that the shift pulses are not synchronized in time with the signals from the position sensors and switching registers at the moment of the presence of a single weight pulse in the high-order trigger of the 1st register provides, along with the pulse 30, the ϊth reversible counter , simultaneously entering it at the input of the (Ch + 1) -th register. By the next shift pulse, the same ¹ weight pulse is entered into the trigger of the least significant (i + 1) -th register and, advancing along the shift register, it goes to the summing input of the (i + +1) -th reverse counter.

When the dumping cart moves Back and moves from the ιth hopper to the (- "+ 1) th, weight pulses / present in the ith th shift register can no longer fall into the ith throttle counter, but shift along registers and enter the reverse counter of the last hopper.

These disadvantages lead to the fact that the device does not provide a correspondence between the contents of the reversible counters and the weight of the material in the bins.

The purpose of the invention is improving accuracy.

This goal is achieved by the fact that OR elements are introduced into the automatic weight control device, and the outputs of all keys connected to the summing inputs of the reversing counters are additionally connected to the inputs of setting the triggers of the upper digits of the previous registers to zero, and the input of each key except the first through an OR element it is connected to the previous and corresponding to the given key sensors of the position of the dumping cart.

In FIG. 1 shows a functional diagram of the proposed device? in FIG. 2 is a schematic diagram of a weight pulse shift recorder / in FIG. 3 is a timing diagram of the operation of the device.

The device contains a conveyor scale 1 for weighing the moved load at the inlet of the hopper (technological units are not indicated in the drawing), a displacement sensor 2 on the feed conveyor, registers 3 for reproducing the shift of the weight pulses, sensors 4 for the position of the dumping truck, keys 5, scales 6, reversible counters 7 the weight of the material, the summing inputs of which are connected to additional inputs of the installation in the zero state of the triggers 8 (Fig. 2) of the senior bits of the registers 3 and connected. to the outputs of the keys 5, the inputs of which, in addition to the first key, are connected via OR 9 to the outputs of the previous and corresponding to the given hopper sensors 4 positions of the dumping cart.

The device operates as follows.

Upon receipt of material through the loading conveyor, the scales 1 generate pulses that are fed to the counting input of the zero register 3, where they are stored for a time equal to the period of the pulses arriving at the shift inputs of the registers 3 from the sensor 2.

When moving the conveyor belt by a predetermined value, the sensor 2 generates an impulse by which the weight pulses of all registers 3 · are shifted by one unit discharge.

Thus, the weight pulses are stored in the registers 3, and as the material and the dumping cart move, they either shift along the registers 3 or arrive at the summing input of the reversible counter 7 of the loaded hopper.

Switching of the registers 3 occurs when the dumping trolley moves from the loading position of one hopper to the loading position of another hopper.

The subtracting inputs of the reversing counters 7 receive pulses from the scales 6, controlling the amount of material discharged from the hopper.

As a result, each of the reverse counters 7 contains information about the amount of material in each of the bins. In this case, at the moment of transfer of the dumping cart qt of one hopper to another, the weight pulses are moved along the register by shift pulses generated by the belt movement sensors 2, which are not synchronized in time with the moments when the dumping cart moves from one hopper to another.

If the dumping cart is located above the -i -th hopper and the shift pulse at the time point -C (Fig. 3) a weight pulse is recorded in the senior bit of the i-th shift register 3, then at the same time this pulse through the -th key 5 is fed to the input of the summation of the i-th reverse counter 7 and at the same time to the input of the setting to 0 of the trigger 8 of the highest order of the ιth register

3. The entry in the reversible counter 7 of this weight pulse is carried out on the trailing edge of the next shift pulse (time

If, before the arrival of the next shear impulse, the dumping cart moves from the nth to the (v + 1) -th bunker (moment in time, then the output of the highest order of the 1st register 3 through key 5 is connected to the input of the next (i + 1) -th register 3 of the shift, and the summing input of the i-th reverse counter 7, the weight pulse disappears.This leads to the latter entering into the reverse counter 7 _ and simultaneously at the input of the setting to 0 this weight pulse in the trigger 8 of the highest order is erased, which eliminates its overwriting by the next shift pulse in (i +1 ) -th shift register 3, that is, doubling the weight pulse is excluded.

In the time diagram (Fig. 3), a doubled weight pulse is shown.

When the dumping cart moves Back and goes from the -i to the (ί - 1) -th bunker, the weight pulses remaining in the triggers of the 1st register 3 are moved by the shift pulses in the register and are written via the key 5 to the i-th reverse counter

7. This is achieved by the fact that each key 5 is controlled through element 9 OR by the i-th and previous (i - 1) -th position sensors 4.

Thus, at the output of each i-th reversible counter 7, the number of pulses is obtained, which is proportional to the weight of the material located at any time in the i-th hopper.

Claims (3)

The inputs to the zero state of the triggers of the old bits of the previous registers, and the input of each key, except for the first one, through the OR element are connected to the position of the trolley resetting the corresponding position sensors and the corresponding key. FIG. 1 shows a functional diagram of the device in FIG. 2 is a schematic diagram of the repro recorder of the shift of the weight pulses; in FIG. 3 - time diagram of the device. The device contains conveyor scales 1 for weighing the displaced cargo at the entrance of the bunker (technological units are not indicated in the drawing), sensor 2. movement on the feed conveyor, registers 3 reproduction shift weight pulses, sensors 4 positions of the spreading cart, keys 5, scales 6, reversible counters 7 materiksha weights, the summing inputs of which are connected to auxiliary. the positive inputs of the installation in the zero state of the flip-flops 8 (Fig. 2) of the upper bits of the registers 3 and connected. to the outputs of the keys 5, the inputs of which, except for the first key, through the elements 9 OR are connected to the outputs of the previous and corresponding to the given sensor sensors 4 positions of the dump carriage. The device works in the following way. When the material enters the loading conveyor, the scale 1 generates pulses that arrive at the counting input of the zero register 3, where it is stored for a time equal to the period of the pulses received by the shift inputs of the registers 3 from the sensor 2. When the conveyor belt is moved by a given amount, the sensor 2 emits a pulse, which shifts the weight pulses — all registers 3 — by one bit. Thus, the weight pulses are stored in registers 3, and as the material moves and the dump carriage either are shifted along registers 3 or are fed to the summing input of the reversing counter 7 of the hopper being loaded. The switching of registers 3 takes place at 1T when the dumping car moves from the loading position of one silo to the loading position of another silo. The subtractive inputs of the reversible counters 7 receive pulses from weights 6 that control the amount of material unloaded from the hopper. As a result, each of the reversible meters 7 contains information on the amount of material in each of the bins. At the same time, at the moment of transition of the QT dumping truck of one bunker to another, the weight pulses are moved through the register by shear pulses, formed by the tape displacement sensors 2, which are not synchronized in time with the moments of transfer of the bunker from another to the other. If the dumping cart is above the i-bunker and the shear momentum. 3) in the early years of the i-th shift register 3 a weight impulse is recorded, then at the same time this impulse through the i-th key 5 is fed to the input of the summation of the i-th reversing counter 7 and simultaneously to the input of the installation of the upper trigger 8 bit yes 1st register 3. This weight impulse is inserted into the reversible counter 7 along the trailing edge of the next shift pulse (time-t. If, before the next shift pulse arrives, the OT-TI drop car will transfer to the (-) + 1) th bunker (the moment of time, the output of the most significant bit of the 1st register 3 is connected via the key 5 to the input of the next ti + 1) th register 3 of the shift, and the summing input of that reversing counter 7 the weight pulse disappears. This leads to the entry of the latter into the reversible counter 7 and at the same time at the installation input into O this weight pulse in the high-order trigger 8 is erased, which prevents it from being overwritten by the next shift pulse in the (i +1) -shift register 3, i.e. the doubling is eliminated weight impulse. The nvHKTHpOM in the timing diagram of FIG. 3) shows the doubling of the weight impulse. When the dumping cart moves back and transitions from the i-th to the (i-1) bunker, the weight pulses left in the triggers of the 1st register 3 are shifted through the register with the pulses of the shift and, via the key 5, are recorded in the i-th reversing counter 7. This is achieved by the fact that each key 5 is controlled through element 9 OR by the ith and previous (1 - ij th position sensors 4). Thus, at the output of each i-th reverse counter 7, a number of pulses is obtained proportional to the weight of the material found at any moment in the i-tom bunker. Formula and The device of automatic control of the weight of the material in the bunkers according to ed. St. 301554, in order to improve the accuracy, the elements OR are introduced into it, the outputs of all keys connected to the summing-up inputs of reversible counters are additionally connected to the installation inputs to the zero state of the high-order triggers of the previous registers, and the input of each key except the first through the OR element is connected to the previous and corresponding to the given key position sensors carts. Sources of information taken into account in the examination 1. USSR author's certificate 301554, cl. Chd01 G 23/36, 1969 1 (prototype). Pv - p P, 4-p / If -1 DV D U i -1 Uf - Safped, U