JPS6360816A - Control system of main raw material quantity in floor laid hopper - Google Patents

Abstract

PURPOSE:To control the quantity of a main raw material fed into a floor raid hopper continuously and with high accuracy without need for carrying out the complicated repetition of the normal/reverse rotation of a reversible motor by controlling the normal/reverse rotation of a reversible conveyor at a speed in accordance with the quantity of said main raw material in said floor laid hopper. CONSTITUTION:A main raw material introduced from a charging hopper 1 to a screen 6 is sent out onto a reversible conveyor 28. The driving motor of the reversible conveyor 28 is controlled by a control circuit 41. That is, when a main raw material in a floor laid hopper 10 is detected by a high level sensor 37, an auxiliary contact 38 is turned on while a normal rotation signal is outputted from the control circuit 41 to an auxiliary relay 33 and a contact 25 is turned on, to normally rotate the driving motor. At the same time, a predetermined level of speed signal is outputted to the driving motor. On the other hand, when, e.g., an auxiliary contact 32 is turned on due to the output of a low level sensor 29, the reversing speed of the reversible conveyor 28 is raised to the maximum, to feed the main raw material rapidly into the floor laid hopper.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for controlling the amount of main raw material in a bedding hopper in a sintering facility, which controls the amount of main raw material in a bedding hopper to a constant amount.

[Conventional technology]

Fig. 4 is a system diagram showing a conventional main material control device in a bedding hopper.
3 is a sintering machine, 3 is a primary crusher that crushes the main raw material, 4 is a tala, 5 is a secondary crusher, 6 is a screen, 7 is a reversible conveyor that rotates in the normal direction to feed crystallization, and rotates in the reverse direction to feed the bed sheet, 8
．． 9 is a bedding conveyor, 10 is a bedding hopper, 11 is a high level sensor that detects a high level of the main material level in the bedding hopper 1O, and 12 is a low level sensor that also detects a low level. . FIG. 5 is a control circuit diagram of each of the conveyors 7, 8, and 9, and in the figure, 13 is a contact that is turned on when the main material is at the low level;
4 is a contact that turns off at the above high level, 15 is relay 1
6 is a self-holding contact, 16 is the above-mentioned relay excited at the low level, 17.22 is the a contact of the relay 16, 2o is the b contact of the relay 16, 18.19 is the motor of the bedding conveyor 8, 9 The starting relay, 24.25 is its auxiliary contact, 21.23 is the forward rotation and reverse rotation command relay for the reversible conveyor 7, -126 and 27 are its auxiliary contacts.

Next, the operation will be explained. The main raw material cut out from the charging hopper 1 is first fired in a sintering machine 2, then crushed by a primary crusher 3 by a conveyor, cooled by a cooler 4, and crushed again by a secondary crusher 5. . Next, the parts are guided to a screen 6, separated, and transferred to a reversible conveyor 7, except for a part to be sent out as finished products.
transported upwards. Normally, the reversible conveyor 7 rotates the product in the forward direction. However, if the main material in the bedding hopper 10 becomes low level, the conveyors 8 and 9
starts operation, the reversible conveyor performs reverse operation,
The main raw material is guided to the bedding hopper 10. On the other hand, when the level of the bedding pad 10 reaches a high level, the conveyors 8 and 9 are stopped, and the reversible conveyor 7 is operated in normal rotation to transport finished products. FIG. 5 shows a circuit for rotating the conveyors 8, 9, and the reversible conveyor 7 in normal and reverse directions according to the level signal of the bedding hopper 10.

According to this, when there are few main pieces i'' in the bedding hopper 10 and the contact 13 is turned on, the relay 16 is energized 1115,
Furthermore, while this is self-held by the self-holding contact 15, when there is enough main material and the contact 14 is turned off, it is demagnetized. Also, when the relay 16 is energized, the a contact 1
7, the motor start relays 18 and 19 of the conveyors 8 and 9 are energized, and their auxiliary contacts 24 and 25 are closed, and a start command signal is sent to the conveyors 8 and 9, respectively, to start operation. The relay 23 is excited by the a contact 22, the contact 21 is turned on, and a reversal signal is given to the reversible conveyor 7, allowing the bedding system to operate.

[Problem that the invention seeks to solve]

The conventional control system for the main material in the bedding hopper is configured as shown below. Since the start and stop are frequently performed, and the reversible conveyor 7 for switching between finished product feed and floor bed feed is frequently switched between forward and reverse directions,
There are other problems, such as the large amount of mechanical stress exerted on the motor and mechanical system, which greatly affects their service life, and the need for a complicated control circuit based on the above-mentioned level detection signals.

This invention was made to solve the above-mentioned problems, and enables the continuous operation of the bedding conveyor and reversible conveyor of the bedding system to smoothly and highly accurately control the main raw material in the hopper. The purpose of this study is to obtain a control method for the amount of main raw material in the bedding hopper.

[Means for solving problems]

The method for controlling the amount of the main raw material in the hopper according to the present invention is such that a speed control circuit is provided to control the speed of the motor that drives the reversible conveyor for transporting the main raw material. The reversible conveyor is driven at a speed corresponding to the amount.

[Effect]

The speed control circuit in this invention not only rotates the motor that drives the reversible conveyor in the forward and reverse directions, but also controls its speed in accordance with the amount of main material in the bedding hopper, so that the motor is fed into the bedding hopper. It functions to continuously and accurately control the amount of main layer material supplied, that is, the amount of main material in the bedding hopper.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, numeral 37 is a high-level sensor for determining whether to feed finished products or bedding, and is located inside the bedding hopper 10.
The high level sensor 1 is provided above the high level sensor 1. A low level sensor 29 is provided in the bedding hopper 10 and below the low level sensor 12. Further, 2B is a μ reversible conveyor whose motor speed can be adjusted. FIG. 2 is a circuit diagram for performing forward/reverse control and speed control of the reversible conveyor 28.

In the figure, 30 is an auxiliary contact that closes in response to the output of the high level sensor 11, 31 is an auxiliary contact that closes in response to the output of the low level sensor 12, and 32 is an auxiliary contact that closes in response to the output of the low level sensor 29. An auxiliary contact that closes, 38, an auxiliary contact that closes in response to the output of the high level sensor 37, 41
33.34 is a speed control circuit that outputs a forward/reverse signal and a speed signal of the reversible conveyor 28 according to each auxiliary contact input;
35.36 are the contacts of each auxiliary relay 33.34, and when these contacts 35.36 are turned on, the reversible conveyor 2 is activated.
8 motor is controlled to rotate forward or reverse. Note that 40 is a speed control signal, which outputs a signal at a level corresponding to the state of each of the auxiliary contacts 30 to 32.38.

FIG. 3 is a speed characteristic diagram of the speed control circuit 41.

Next, the operation will be explained.

First, the main raw material introduced from the charging hopper 1 to the screen 6 in the same manner as in the conventional example is delivered onto the reversible conveyor 28. This reversible conveyor 28 is controlled for forward rotation, reverse rotation, and speed by its driving motor or by a control circuit 41 shown in FIG.

That is, when the main material in the bedding hopper 10 reaches the level detected by the high level sensor 37, the auxiliary contact 38 is turned on, and in accordance with this, the control circuit 41 outputs a forward rotation side activation signal to the auxiliary relay 33, This auxiliary relay 3
3, the contact 35 is turned on to rotate the motor of the reversible conveyor 28 in the normal direction to feed the finished product. At the same time, a speed control signal 40 at a predetermined level is output to the motor, and the reversible conveyor 28 is driven to rotate forward at a predetermined speed. Note that, except when the auxiliary contact 38 is turned on by the high level sensor 37, the mode is set in which the motor and the reversible conveyor are reversed as described below.

In addition, in the mode in which the amount of the main raw material in the bedding hopper 10 is detected by the high level sensor 11 and the low level sensor 12, 29, the bedding hopper 10 is requesting the main raw material, so each The reversing speed of the reversible conveyor 28 will be adjusted depending on the mode. That is, when the auxiliary contact 32 is turned on by the output of the low level sensor 29, the control circuit 41 operates as shown in the speed characteristic diagram of FIG.
A current of as much as 20 mA is output as the speed control signal 40, a corresponding level of power is input to the motor, the reverse speed of the reversible motor 28 is maximized, and the main raw material is quickly supplied into the bedding hopper 10. Similarly, low level sensor 1
2. Auxiliary contact 31 based on the output of the high level sensor 11.
30, the control circuit 41 outputs 4 mA or 12 mA.
A current of mA is output, and electric power of a level corresponding to this is inputted to the motor, and the reversible conveyor is reversed at a speed corresponding to each electric power. In this case, when any of the auxiliary contacts 30, 31, and 32 is on, the control circuit 41 energizes the auxiliary relay 34, turns on the contact 36, and controls the reversible conveyor in reverse mode. As a result, the amount of the main raw material in the bedding hopper 10 is
According to the supply speed of the main raw material conveyed by the reversible conveyor, the speed of which is continuously changed according to the output of 2, 29. 37, the amount is automatically controlled to be always approximately constant. Further, the bedding conveyor 8.9 is always driven while the reversible conveyor 28 is in operation.

Although the above embodiment describes the case where there is only one sintering equipment, it can be started even if there are multiple sintering equipments.

The amount of the main raw material in the bedding hopper 10 can be easily and reliably automatically controlled without complicating the stopping operation or circuit.

〔Effect of the invention〕

As described above, according to the present invention, the reversible conveyor is configured to be driven in forward and reverse directions at a speed corresponding to the amount of main material in the bedding hopper. There is an effect that the amount of the main raw material fed into the bedding hopper can be controlled continuously and with high precision without repeating the process.

In this way, there is no need to repeatedly start and stop the bed conveyor, and shock and wear on the motor and mechanical system are eliminated, extending the lifespan of these.Moreover, the operation and circuitry are simplified, making it cheaper and easier to use. This has the effect of being able to adjust the amount of the main raw material in the bedding hopper with high precision.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing a control method for the amount of main material in the bedding hopper according to an embodiment of the present invention, Fig. 2 is a control circuit diagram for forward/reverse control and speed control of the reversible conveyor, and Fig. 3 is a control circuit diagram. The speed characteristic diagram of the circuit, Figure 4 is a system diagram showing the conventional system,
FIG. 5 is a control circuit diagram for controlling the drive of the reversible conveyor and the bedding conveyor. 2 is a sintering machine, 3.5 is a crusher, 10 is a bedding hopper,
11.37 is a high level sensor, 12.29 is a low level sensor, 28 is a reversible conveyor, and 41 is a control circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Fig. 1 2: Stffi mo iso 63.5: Fra...sha 11. 37: High speed IVton i 12.29: Low speed 1 and t shift 28 - Reversible pair Fig. 2 Fig. 3 - j Goka 19 Otomi ρshi. Figure 4

Claims (1)

[Claims] The main raw material fired by the sintering machine is crushed by a crusher and then guided to a reversible conveyor, and the reversible conveyor is rotated forward or backward depending on the level of the main raw material in the bedding hopper where a part of the main raw material is stored. In a method for controlling the amount of main raw material in the bedding hopper in a sintering facility that controls the amount of the main raw material in the bedding hopper, a speed control circuit is provided to control the speed of the reversible conveyor. A method for controlling the amount of main material in a bedding hopper, characterized in that the reversible conveyor is driven at a speed corresponding to the amount of main material in the hopper.