SU515946A2 - Electronic-hydraulic belt scales - Google Patents

Description

one

The invention relates to the field of high-measuring technology.

Electric and hydraulic conferencing scales are known by author. St. No. 330349.

These scales (Do not provide Tip accuracy and have an insufficient range of use.

The proposed scales are equipped with an additional weight sensor that is identical to the main, additional device with an ohm (maid sensor, with a single C01 in conjunction with a single unit, with a coding sensor and a single unit, with a coding disk, and a shim, and a shim, and a shim, a shim, a shred, a rype, and a shim, a shim, a shred, and a rype, a shredder, a shredder, a shredder, a shredder, a shredder, and a shredder. which the shaper of the command sensor of the additional pointing device is connected, and the output of the element “AND is connected to the trigger of the account management block.

iKpoMe addition, the scales are equipped with two additional keys connected to the inputs of the additional element “I.

The weight sensors have pressure control assemblies.

The drawing shows the proposed scales.

The scales contain hydraulic sensors 1 and 2 weights fixed and connected to the indicating devices 3 and 4. On the string of the indicating device 3 there is

the command sensor 5, and on the arrow of the lobby 4 - the command sensor b. The counting sensor 7 is fixed at the same time (imodisable with teeth 8 encoding

disk 9. The coding disk is kinematically with the same transmission coefficient connected to the command lobes 10 and 11, interacting with the command sensors 5 and 6, and is driven by the movement of the displacement unit 12. (Other types of sensors, HanpHMeip, can be used as sensors 1 and 2 induction, photoelectric or contact, and the command lobes 10 and AND, the encoding disk 9 can be performed in

labels made of opaque or non-magnetic material, which, when crossing the field of the sensor, generate signals).

The command sensor 5 and the counting sensor 7 are connected to the account control unit 13 via drivers 14 and 15 respectively, and the command sensor 6 is connected to the account control unit 13 via serially connected formator 16 and the element 17, the other two inputs connected to keys 18 and 19. The output of the element & 17 through the key 20 is connected to the reset bar of the counter 21, the counting input of which is connected to the output of the account control unit 13. The formers 14, 15 and 16 are intended to form powerful pulses from the low-current signal of the sensors these fronts.

The kinematic connection between the coding disk 9 and the command rims 10 and 11 is carried out through gears 22, 23, 24. The weight sensors are equipped with pressure control nodes 25 and 26. The control unit of the account consists of a trigger 27, to the inputs of which are connected the output of the & 17 and the shaper 14, and the element “And 28, to the nerve input of which the trigger 27 is connected, and the second input is connected to the counter 21.

Weight sensors, indicating devices and connecting elements form hydraulic systems of the balance, which are made of identical elements and contain identical volumes of liquid. The fluid in the hydraulic systems is under the initial pressure, which is determined either by the tare weight or by the artificially created initial backwater due to the change in the volume of the hydraulic systems with the help of pressure control units, 25, 26.

Scales work as follows.

When weighing bulk materials transported by a conveyor belt, with the result of the weighing by an accumulating total, the keys 18, 19, 20 are turned off. One of the weight sensors, for example, sensor 1, senses the weight of the section of the loaded belt branch, and sensor 2, the idle branch of the conveyor belt. The rotation from the conveyor belt is transmitted to the displacement unit 12 and transmitted from it to the coding station 9, on whose axis the gear 22 is fixed. The rotation from the gear 22 is transmitted gear 23 and 24 with the command lobes 10 and 11 rotating on them synchronously.

If there is no load on the conveyor belt, the command lobes simultaneously interact with the sensor 5 and 6, and the signals of the beginning and end of the countdown to the account control unit arrive simultaneously. In this case, the pulses from the counting sensor 7 on the output of the account control unit are absent, the angles of rotation of the arrows of the indicated instruments 3 and 4 are equal.

When the conveyor belt is loaded, the weight sensor 1 senses the weight of the load located at a certain length of the mite section. The pressure of sensor 1 is converted into the angle of rotation of the arrow of the pointing device 3. Command tab 11 interacts with sensor 6, and one of the control inputs of the account control unit 13 through the driver 16 and element 17 "And the signal of reference originates, allowing the angle of rotation of the arrow to sensor 5 relative to the arrow with the sensor 6 pointing devices 3 and 4.

The trigger 27 is set to a single distance, and a single potential is applied to one of the inputs of the element 28, allowing the pulses from the sensor 7 to go to the counter 21 through the second input of the element 28 and 28. OneBpeiMeiHiHO reads the angle of rotation of the encoding tag 9.

In the interaction of the command tab 10 with the sensor 5, the second input of the block is acquired by a score of 13 through the imaging unit 14, the signal of the counting end. The trigger 27 is set to the zero state, the element & 28 is closed, and the pulses from the counting sensor 7 cease to flow into the counter 21. The reading angle of the coding disk 9 is associated with the angle of rotation of the sensors 5 and 6 relative to each other by the ratio

with i (-f - That).

where i is a gear ratio greater than one;

f - the angle of rotation of the sensor 5;

F0 is the angle of rotation of the sensor 6. This design of the measurement system can reduce the dynamic measurement error and the relative effect of the conveyor belt adjacent to the weighing section, and reduce the measurement process to the sum of single measurements in statics; reduce the readout error in / times by reducing the weight reading time in the measurement period between successive weighings, since the angle φ of rotation of the arrow of the pointing device 3, which is proportional to the weight of the transported material, increases in i times due to the presence of gears

23, 24, 25; use sensors with low sensitivity, which is very important for the measuring system of the scale in terms of reducing the various fluctuations of the conveyor belt.

The reading angle of the fs is converted into a proportional number of pulses by means of teeth 8 of the coding disk 9 applied on it with a definite angular step fcP pulses, arising during the interaction

the teeth 8 of the coding disk 9 with the counting sensor 7, are fed through the imaging unit 15 into the counter 21. In this case, the number of pulses n passing into the counter 21 is equal to

with

P

to

The pick is repeated each time a reference point comes. The number of pulses characterizing the weight is summed in the counter 21 as the weighing cycles pass.

In the case of using scales as an indicator of instantaneous load or to determine the instantaneous performance

The key 20 closes the conveyor. At the same time, the reference pulse simultaneously arrives at the input of the account control unit 13 and to the reset bus of the counter 21 before each weight measurement. In counter 21 each time passes

the number of pulses proportional to the mg load at the weighing part of the conveyor belt.

The proposed scales can also be used for weighing materials transported by trolleys. Then the keys are 18, 19 and

20 normally closed. The process of weighing by trolleys is that both empty and loaded trolleys are weighed at the same time. The tare weight is automatically subtracted from the gross weight (loaded trolley). One of the weight sensors, such as Sensor 1, senses the weight of the loaded trolley, and the other, for example, Sensor 2, senses the weight of the empty trolley. The keys 18 and 19 are installed remotely and serve as sensors for the position of the trolleys.

When the trolleys are absent on the weight sensors, the keys 18 and 19 are closed, and two inputs of the element "And 17" receive zero signals that block the arrival of the start signal to the account control unit 13. The pulses from the counting sensor 7 do not pass through the account control block in counter 21.

When both cars are available on sensors 1, 2, keys 18 and 19 (position sensors) are opened, and single signals are received at the two And 17 inputs of the element permitting the weighing process. When the command tab 11 driven by the node-displacement 12 crosses the sensitivity zone of the sensor 6, the latter issues a single reference pulse, which through the element "And 17 enters one of the controls, their inputs of the block 13. The trigger 27 is set to single state, and a single potential goes to one of the inputs of the element E28, allowing the arrival of counting pulses from sensor 7 to counter 21. At the same time, the starting pulse through key 20 goes to the reset bus of counter 21, preparing it for operation. When the command lobe 10, the vrashayush, iis synchronously with the command lobe 11, crosses the sensitivity zone of the sensor 5 with the sensor 6, a single pulse of the end of reference is removed and

the driver 14 is fed to another control input of the block 13. In this case, the trigger 27 is set to the zero state, the element & 28 is closed, and the pulses from the counting sensor 7 cease to flow into the counter 21. The readings of the counter 21 are read from the indicator board.

The cycle repeats each time a reference point comes. The transformation of the angle of rotation of the arrow of the pointing device 3, proportional to the weight of the cargo transported by the trolleys, is similar to the transformation during the transportation of cargo by a conveyor belt.

Claims (3)

1. Electronic-hydraulic belt scales according to ed. St. No. 330349, characterized in that, in order to increase accuracy and expand the range of use, they are equipped with an additional weight sensor, identical to the main, additional indicating device with a command sensor, connected with the main command sensor by a gear with a gear ratio greater than one, with the coding disk, and the element “I”, to the input of which the driver of the command sensor of the additional pointing device is connected, and the output of the element “AND” is connected to the trigger of the account control unit. 2. Electronic-hydraulic scales according to claim 1, characterized in that they are provided with two additional keys connected to the inputs of the additional element “I. 3. Electronic-hydraulic scales on PP. 1 and 2, characterized in that in them the weight sensors are equipped with pressure adjustment units. gz