RU1816969C - Batch-weighing device for wheel excavators - Google Patents

Abstract

Usage: the invention relates to instrumentation and can be used in a weight-metering technique to form doses of material with a weight minimally different from a given dose weight. SUBSTANCE: invention contains a conveyor scale mounted on conveyor 1 with a measuring part, including a load-receiving mechanism 2 with a force-measuring sensor 3, a speed sensor 4 and a conveyor angle sensor 5, a slewing-rotary unloading device 6 with a movable unloading part 7 and a lower rotation drive parts, shutter 8 with actuator 9. It is important: the part of the weighing and dosing device is the operating device. 4 ill.

Description

Fig: 1

The invention relates to a metered dose rate; indication board

loading single containers, in particular the totalizer (actual loading of the car)

railway gondola cars, rotary18; comparator 19, in which, by comparison with excavators, the values of the electric signal, coal, mining and other industries x5 coming from the integrator 13 and the setter can be used

mining. doses 20, electrical signal from the master

The purpose of the invention is to increase the exact dose will correspond to a given dose,

the dosed loading capacity of single containers, which depends on the loading capacity of the rotor excavators of a long wagon; time delay element

In FIG. 1 is a structural diagram of schematic 21 intended to withstand the interval of the proposed weighing device for the time required for recording

Accessories for bucket wheel excavators. Electrical signals with a 10 V multiplier

The weighing device for the ro-storage device of a complete production excavator contains a duration of 14 and a corresponding time on a continuously moving conveyor15 equal to a maximum time of 1 conveyor scale with a measuring shutter-release time of 8, i.e. at most, including the load-carrying meme, cut-off time of the material flow; Khanism 2 with a load sensor 3, a time delay element 22, a pre-speed sensor 4 and an angle sensor tilted to delay the temporary inter-conveyor 5. In addition, the weight metering shaft 20, equal to approximately half of the device, contains a reference-rotary interval of element 21, and after unloading device 6 with a movable base issuing a reset signal to zero, i.e. the unloading part 7 and the rotation drive cleaning the integrator 13 and closing the comm-lower part, the shutter (gate) 8 with the drive motor 16; block for forming temporary 9. The slewing-rotary unloading device-25 of delays 23, including the first 24, is intended for continuous behind and second 25 switches, the first 26 and loadings with transported material 27 computing elements. adder of final capacities. Slewing-rotary28, time counter 29, comparator 30, unloading device allows the interchange switch 31 and the temporary control elements to be delayed when loading wagons from one (fill-up 30 32. Block forming a temporary suspended) wagon to another (which holds 23 is intended to be delayed (it is necessary to fill) without stopping the signal to start moving the gate 8 of the load conveyor. The movable unloading is the time interval necessary for the visual part of this device necessary that the measured and taken into account material due to the fact that the mutual position 35 has come from the measuring point, i.e. fuzopriem-loading boom of the excavator and loading mechanism 2, to the cut-off point, i.e. the wagon can be different, and the closure 8. The time interval calculated by adjusting the position of the submersible in the block for forming the temporary sighting boom and the lower part of the support-rotation delays 23 depends on the speed of the conveyor of the rotary device, 40 is reached at the corresponding time. the directionality of the material flow in the unloading part of the unloading part 7 is the supporting and turning part of the railway gondola car.

The most important part of the weight-metering position of the shutter 8. The output signal of the device is the operating device for generating time delays 23

the state. The operating device includes v45 is the control for the storage

factor 10 with indicator board full performance 14

11, which are known devices and gate actuator control units 33. B

mi; switch 12, the main function of the co-measuring part of the weighing

In the direction of the device information, a position sensor is introduced that is dependent on the incoming command either from the 50th (unloading) part of the support-turning integrator 13 or into the memory of the oral unloading device 34,

a swarm of full performance 14; in-intended for recording the post-indication display of the total unloading part in terms of productivity (dose) 15; switchboard to loading conveyor, and sensor

16, the main function of which is to pass-55 the angle of rotation of the shutter (gate) 35, to predict or stop the output information-driven to determine the change in angle

from the integrator 13 depending on the position of the shutter 8 and the position of which

incoming team; the adder 17, the main gate 8 is in the corresponding mono function of which is the summation, in order to determine the law of cutting off discrete values of the flow (i.e. dose) and adjust

the time interval for the shutter lag 8. The operating part of the metering device also contains a dose cut-off computing unit 36, which includes an integrator unit 37, an adder unit 38, a difference unit 30, a first integrator 40 and a second integrator 41. The dose cut-off calculation unit was implemented There is a calculation of the flow cutoff law depending on the rate of change of the angle of the shutter position 8 and the position of the unloading part of the slewing rotary unloading device 7, i.e. it calculates which part of the stream, when cut off, falls on a loaded railway gondola, and which new one, which is just starting to load. In addition to the above, the operational part of the weighing and dosing device includes: an additional storage device 42, designed to record a signal corresponding to the mass of material that will fall on a new (empty) car when the dose is cut off; a switch 43. which transmits information from the additional storage device 42 to the adder 17, only by the corresponding control signal; time delay element 44, designed to withstand the time interval required for the adder 17 to perform the corresponding computational operations, after which it gives a signal to reset the totalizer 17 and an indication board of the actual load of the car 18. and then to the circuit for the time delay element 45, which - the first is designed to withstand the time interval necessary to reset the readings from the adder 17 and the display panel of the actual load of the car 18, and then provide a signal to the control inputs of the switch ora 16 and the switch 43 and the exposure of this signal for the time necessary to transfer information from the additional storage device 42 to the adder 17. To determine the compliance of a given dose received in the operating part of the weighing device, a difference unit 46 is used, in which, upon receipt of the difference in the value of the predetermined (dose adjuster 20) and received (adder 17) signals, a corresponding signal is generated in the time delay generating unit to correct the shutter lag time 8.

Weighting device operates as follows.

The material flow passing through the belt of the loading conveyor 1 of the bucket wheel excavator acts on the load-receiving mechanism 2 with the force / proportional mass of the material located at that moment in the load-measuring section of the material and through the slewing rotary unloading device 6 enters the loaded tank (railway gondola car), The load receptor 2 is connected by hard communication with the load cell 3. From the output of the load cell 3, an electrical signal is proportional to the weight of the load cell Yelnia material portion is fed to the input of multiplier 10. In general, the input of multiplier 10 also receives electrical signals with

5 of the speed sensor 4 and the angle sensor of the conveyor 5, and the output electrical signal from the factor 10 will be proportional to the instantaneous productivity of the bucket wheel excavator, the digital values of which

0 will be displayed on the scoreboard 11. Through the switch 12, the output signal from the factor 10 will be fed to the input of the integrator 13, where the electrical signals are proportional to the instantaneous performance of the rotary

5 excavators will be integrated over time. The output signal from the integrator 13 is fed to the input of the display panel of the total productivity (dose) 15 and. through the switch 16, which is currently open, is fed to the input of the adder 17.

Simultaneously with the above, the electrical signal from the integrator 13 will be fed to the input of the comparison unit 19, where

5 will be compared with the electrical signal from the output of a dose adjuster 20 corresponding to a given dose. With the equality of these signals, which indicates that the required dose is measured, the output of block 19 is

0, an electric signal is sent to the control input of the information direction controller 12, as a result of which the output signal of the output signal from the multiplier 10 is closed to the input of the integrator 13 and the signal from the multiplier 10 is now fed to the storage device of full performance 14, where it is recorded. In addition, the electrical signal from the output of block 19 is fed to the input of the block forming time delays 23 and the inputs of the element

0 time delays 21 and 22. Electrical signals from the speed sensor 4 are received at the inputs of the time delay generating unit 23, the signal of which will be proportional to the conveyor speed at a given instant of time and the angle sensor. conveyor 5, the signal of which will correspond to the angle of inclination of the conveyor at a given time. The signal from the output of the time delay generating unit 23 is a command for the shutter drive control unit 33 to start moving the shutter 8 and a control command for the full capacity memory 14 to start receiving information to the dose cut-off computing unit 36. In general, the transit time of the material from the measurement point to the cut-off point is determined as follows. Material transit time from the measuring point to the end of the conveyor

t1 77

where L is the length of the conveyor of the measuring point to the end of the conveyor;

v is the speed of the conveyor belt.

The transit time of the material from the end of the conveyor to the cut-off point is determined in the following order.

The equations of motion of the material will have the form

2

x v-cosa; y -4-y slncr; (2)

where a is the angle of inclination of the conveyor.

We obtain the equation of the material path by excluding the parameter from the equation of motion (determining from the first equation and substituting it into the second, we obtain the parabola equation)

V

x qt% x-8lna t. (3) cos a t y 2 cos a t v

 x

,

.. gh 1 q

sin a

q cos a

t i / 2j 2 x-sing. 1 r o. q cos a

Assign to all values the designations adopted in our particular case:

 - the transit time of the material from the end of the conveyor to the cut-off point;

y H is the vertical distance between the end of the conveyor and the gate;

x Li is the horizontal distance between the end of the conveyor and the gate.

Based on the foregoing, the formula for determining the transit time of the material from the end of the conveyor to the cut-off point will take the form

„T / 2 H 2 L

t2 g-- ----:

sin a

q cos a

Taking into account the fact that when the conveyor tilt angle changes, the values of H and Li will accordingly change q, the formula will take the following form

1/2 N cos a 2 m sin a ,,. 1Q 12 Y -----------; (6)

General formula for calculating the transit time of a material from a measuring point to a cut-off point

fifteen

t L., / 2 H cos a 2 LI sin a t. vq q u

The calculated time value is adjusted according to the adjusted value of the previous cut-off dose.

The operation algorithm of the unit for generating time delays 23 is as follows - after the control signal arrives at the inputs

25 switches 24 and 25, they open, and the block receives signals from the angle sensor 5 and the speed sensor 4. The calculation of the delay time is carried out according to the formula (7) in the computing element 27. If available

30 the difference in the calculated and actually loaded (determined after cutting off the flow) weight in the previous carriage, in the computing element 26, the time interval for which

35, the delay time is adjusted. Correction of the delay time for gate shutter 8 calculated by formula (7) is corrected in the adder 28. Simultaneously with the arrival of the control signal 40 from the comparator 19 to the control inputs of the switches 24 and 25 to open them, the same control signal is sent to the counter time 29, starting the countdown, elapsing (passing) from the moment the measurement of the desired dose is completed. The parity of the calculated shutter delay time 8 of the shutter to the actual time elapsed since the completion of the dose measurement should be

50 by the command to start flashing gate 8. Comparison of the signals from the adder 28 and the time counter 29 is carried out in the comparison unit 30. The equality of these signals serves as a control signal to open

55 of the switch 31. After opening the switch 31, the control signal from the comparison unit 19 is supplied to the control unit of the drive of the shutter 33 and the control input of the storage device of full capacity 14, the transfer starts;

creator 8 and the receipt of information from the storage device of full performance 14 in the computing unit dose cut-off 36.

Simultaneously with the arrival of the signal from the comparison unit 19 to the time delay generation unit 23, the same signal is fed to the inputs of the time delay elements 21 and 22, in which the specified time intervals are maintained, and then the electrical signal from the element 22 closes the switch 16 and clears the integrator 13 and the indication board 15, and then the electrical signal from element 21 is fed to the control input of the switch 12, closes the output of the output signal from the multiplier 10 to the input of the storage device 14 and opens the output post captive signal from multiplier 10 to an integrator 13 again.

As already mentioned, after the signal arrives at the input of the control unit of the shutter actuator 33, the shutter 8 starts moving, cutting off the flow (dose). At the same time, information begins to flow into the dose cut-off computing unit 36 from the full capacity memory 14, the position sensor of the discharge part of the slewing-rotary discharge device 34 and the shutter angle sensor 35. In the dose cut-off computing unit 36, the material flow cut-off law is calculated and determining which part of the material falls into the loading car, and which part into the new one, which will only be loaded.

To clarify the algorithm of operation of the dose cut-off computing unit, we accept a number of positions:

- the flow of transported material during the cut-off of one dose from another is represented as a spatial body with volume V;

- the volume of this spatial body will be determined by the diameter of the discharge opening of the discharge funnel, which is the constant value (d), capacity (Q), and information arrival time to block 14 (t).

The first two values will determine the cross-sectional area of the flow (S), the third - the height (H). The dependence of the cross-sectional area of the body under consideration (S) on the capacity (Q) is explained by the fact that the material flow does not fill the entire passage opening, but part of it, depending on the capacity of the loading conveyor. An approximate cross-sectional view of the transported stream is shown in Fig. 2. The total volume of the cut-off flow (Fig. 3) will generally consist of two distinctly expressed volumes - half the volume of the cylinder (AODK base) and the volume at the base of which lies the segment (ANDO). The expression for determining the total volume of the flow in question will have the form

 + Vce4

(8)

- + | -d -x -H, 15 The volume of the cut-off part of the stream (Fig. 4) is determined by the formula

V

flow compartment

, j 2 -l / R2-y2 vydy: (9) where R O A is the radius of the base;

h DB is the height of the transverse cross-sectional point.

There may be many options for the implementation of a dose cutoff computing unit (operating algorithm, block diagram). For the sake of simplicity, this proposal considers the simplest, most particular case, which gives an idea of the essence of the operations being performed.

The algorithm of the computing unit.

The total flow value is calculated by the formula (8) in the adder block 38.

The instantaneous values of the cutoff part of the stream is determined by the formula (9) in the block integrator 37, and then these instantaneous values of the cutoff part of the stream are integrated in the integrator 41 and will be

correspond to the mass of material coming to a new loading wagon. The difference between the full and cut off part of the stream is determined in the difference block 39, and then integrated in the integrator

40 and will correspond to the mass of material related to the loading wagon.

After calculating, in the dose cut-off computing unit, the magnitude of the electric signal corresponding to the mass of material per loaded car, this signal is supplied from the integrator 40 to the input of the adder 17, where it is summed with the value of the electric signal received at the input of the adder

17c of the integrator 13, before resetting from the last reading, and this total value corresponds to the actual loading of the car and is displayed on the display panel 18. At the same time, the electric signal from the integrator 40 is supplied to the input of the time delay element 44, is delayed by the time interval required for computing operations in the adder 17 and fixing the result, and then the signal from the output of the time delay element 44 goes to the control input of the integrator 40, cleaning it, the control input of the sum Ra 17, being the team to clean it. issuing a signal corresponding to the actual loading of the car on the display panel 18 and at the input of the difference unit 46, where this signal is compared with the value of the signal for setting doses of 20, corresponding to the mass of the given dose, and to the input of the time delay element 45. Obtained in the difference unit 46, the correction is then introduced into the time delay generating unit 23 to adjust the time interval of the signal delay for moving the shutter 8 when the next wagon is dosed. The signal arriving at the input of the time delay element 45 is delayed for a certain, calculated empirically time and then is output to the control inputs of the integrator 41 and block adder 38, clearing it, as well as to the control input of the switch 43 and the control input of the switch 16, being the command to open the switch 43 and switch 16 and the signal corresponding to the mass of material arriving on a new loadable car when the dose is cut off from the additional storage device 42 and the signal corresponding to the mass of the material measured by the conveyor scales for the period of time in which the above operations were carried out from the integrator 13 to the inputs of the adder 17, where they are summed. Subsequently, the cycle is repeated as described above. It should only be noted that the integrator 13 and the adder 17 have the ability to manually reset the readings, the dose adjuster 20 - manual input of information, and all switches - manual input of the control signal.

 The presence in the weight dosing device for rotary excavators of a shutter angle sensor that determines not only the position of the shutter, but also the speed and acceleration of this angle, a position sensor of the unloading part of the slewing-rotary unloading device, which determines the position of the unloading part with respect to the loading conveyor, and also the corresponding elements of the operating part (storage devices, dose cut-off computing unit, etc.).

they allow one to determine the nature of the cut-off of one dose from another and to more precisely determine how much material a non-loaded wagon will have, and which to the next.

The introduction of the above elements into the weighing and dosing device makes it possible to accurately know the dose of the material loaded into the filled wagon and to adjust the value of the time delay for the shutter to operate when one dose is cut off from the other on the next wagon to be loaded, thereby increasing the metering accuracy.

Forumul and zobret n and

A weighing device for bucket wheel excavators comprising a conveyor with a conveyor scale including a load receptor with a force sensor, a speed sensor, a conveyor angle sensor associated with an operating device including a multiplier, integrators, dose adjuster, comparison unit, difference unit , switches, time delay elements and an indication board, slewing rotary unloading unit with a movable unloading part and a shutter, characterized in that, in order to increase accuracy ty in

a dose cut-off computing unit, a shutter angle sensor and a position sensor of the discharge part of the slewing rotary discharge device, the outputs of which are connected respectively, are introduced.

with the first and second inputs of the integrator of the computing unit, the third input of which and the input of the adder of the computing unit are connected to the output of the storage device full

performance, the output of the adder of the computing unit is connected to the first input of the difference unit of the computing unit, the second input of which and the input of the first integrator of the computing unit are connected to the output of the integrator of the computing unit, the output of the difference unit of the computing unit is connected to the input of the second integrator of the computing unit, the output of the first integrator of the computing unit is connected to the input storage device, the output of which is connected to the input of the first switch, the output of the second integ the torus of the computing unit is connected to the first

the adder input and the input of the first time delay element, the output of which is connected to the control inputs of the second integrator of the computing unit and the adder, as well as the input of the second time delay element, the output of which is

dinen with the control input of the first switch, the first control input of the second switch, the control inputs of the adder block and the first integrator of the computing unit, the output of the first switch is connected to the second input of the adder, the third input of which is connected to the output of the second switch, and the output to the input the display panel of the actual load of the car and the first input of the difference unit, the input of the second switch is connected to the output of the integrator of the conveyor scales, the output of which is also connected to the input of the display panel with mmar productivity and the first input of the unit are compared, the input of the conveyor scales integrator is connected to the first output of the third switch, the second output of which is connected to the input of the full capacity storage device, the first control input of the third switch together with the input of the third time delay element and the fourth element input time delay is connected to the output of the comparison unit, the output of the fourth time delay element is connected to the control input of the integrator and the second input of the second about the switch, the output of the third time delay element is connected to the second control input of the third switch, the second input of the comparison unit together with the second input of the difference unit is connected to the output of the dose adjuster, the input of the third switch, together with the input of the instantaneous performance display panel, is connected to the output of the multiplier conveyor scales, the first input of which is connected to the output of the load cell, the output of the conveyor angle sensor is connected to the second input of the multiplier of the conveyor scales and the input ervogo switch unit forming time delays, the output speed sensor is connected to the third input of multiplier weighing conveyor and the input of the second switch unit forming a time delay, the output of the difference block is coupled to a first input of a first computing element form a unit time delay, the output of the first switch Bloch

the time delay generation unit is connected to the first input of the second computing element of the time delay generation unit, the output of the second switch of the time delay generation unit is connected to the second inputs of the first and second computing elements of the time delay generation unit, the output of the first computing element of the time delay generation unit is connected to the first, and the output of the second computing element with the second inputs of the adder of the block forming the time delay, the output of the adder block and the formation of time delays, the output of the adder of the time delay forming unit is connected to the first input of the time delay generating unit comparing unit, the second time delay generating unit comparing unit is connected to the output of the time counter of the time delay generating unit, the input of the third switch of the time delay generating unit is shared by the first control the input of the time counter and the first control inputs of the first and second switches of the unit for forming the time delay of the connection with the output of the comparison unit, the output of the comparison unit of the time delay generation unit is connected to the first control input of the third switch of the time delay generation unit, the output of the third switch of the time delay generation unit is connected to the input of the time delay element of the time delay generation unit, controlling the input of the complete storage device performance and the input of the control unit of the shutter drive, the output of which is connected to the shutter drive, the output of the time delay element bl Single forming time delays coupled to a second input of the third switch and a second control input of the time counter, the second by the control inputs of the first and second switches and a control input of a first computing element forming unit time delays.

Fig, 2 V

(

Editor

R & H

Compiled by Y. Pigeon Tehred M. Morgenthal

Proofreader N. Gunko