JPS60644Y2 - program control device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a program control device that changes set values over time, such as when drying leaf tobacco.

Generally, when drying leaf tobacco, the temperature is gradually increased from a set temperature as shown in FIG. 1 to a set temperature for the drying method after a predetermined period of time.

In addition to reducing the moisture content of the leaf tobacco, the rate of temperature rise requires the use of enzymes in the leaf tobacco to convert it into active ingredients, especially in the early stages, so rapid temperature changes are the least desirable.

Normally, this temperature change is done at a heating rate of about 1 to 2 degrees Celsius per hour, and when a predetermined temperature is reached, the heating operation is stopped and the temperature is held at that temperature for a predetermined time, then the temperature is raised sequentially to the next set temperature. to obtain desired temperature characteristics.

To obtain such temperature characteristics, conventional leaf tobacco drying equipment uses a small synchronous motor in the temperature setting variable resistor of the temperature controller so that the temperature setting changes at a heating rate of about 1 to 2 degrees Celsius per hour. When the temperature rises, the variable resistor also rotates in proportion to the rotation of this motor, and the set value changes accordingly.

Furthermore, when the desired temperature (T1 in Figure 1) is reached, the synchronous motor is turned off, and from then on it operates as a normal temperature regulator to maintain that temperature (t2 in Figure 1).
to t3).

Then, when the time to start the next temperature increase (t3 in FIG. 1) comes, the next temperature (off in FIG. 1) is manually reset.

Once the settings have been made, the synchronous motor is powered on again and the temperature is raised for a predetermined period of time (section 1 to 3 in FIG. 1).

There is a method in which the temperature increase is started manually each time as described above.

Therefore, in such a method, it is necessary to manually change the set temperature each time the temperature is raised, which is complicated to handle and is particularly inconvenient, as drying of leaf tobacco may require 4 to 5 days of drying at night.

There have also been some proposals for fully automatic program control using high-grade program setting devices such as those used in industrial applications, but these are expensive and are not widely used.

The present invention was developed in view of these points, and is inexpensive and labor-saving, which has a simple structure, and can reliably perform program control according to predetermined characteristics of environmental conditions such as temperature, humidity, and flow rate. It provides a program control device that can measure the

An embodiment of the present invention will be described below in detail with reference to FIGS. 2 and 3, taking as an example a case where the characteristics of temperature, for example, are program-controlled as an environmental condition.

FIG. 2 is a plan view schematically showing the structure of the program control device according to the present invention.

In FIG. 2, reference numeral 1 denotes a dial that rotates once every two minutes, for example, for setting the time, and is connected to the motor 2 by a shaft 2a via a reduction gear mechanism (not shown).

A plurality of notches are provided on the outer circumferential portion 1a of the dial 1 over the entire circumference, and on the inner circumferential portion 1b, time indicators of a predetermined range, for example, two instants, are evenly marked over the entire circumference.

Each notch in the outer peripheral portion 1a is provided so that a plurality of setters 3 can be inserted therein according to the time to be set.

4 is an index representing the current time, which is fixed.

The motor 2 is connected to power terminals 5 and 6 and is constantly driven to rotate the dial 1.

As shown in FIG. 3, a magnet board 7 and a switch board 8 are provided between the dial 1 and the motor 2, and a magnet 9 is attached to the opposing surfaces of the magnet board 7 and switch board 8. A plurality of switches, for example, reed switches 10a to 10d, are arranged on the surface of the panel 8 facing the magnet panel 7, depending on how many stages the temperature characteristics to be controlled are to be program-controlled.

As an example, in Fig. 3, eight reed switches are arranged evenly at 45° intervals, and four reed switches are used as one set, and the magnet 9 is attached to each set accordingly. They are installed one by one.

The magnet board 1 and the switch board 8 are concentric with the shaft 2a of the motor 2, but are loosely coupled to prevent rotation by the shaft 2a.The switch board 8 is fixed and the magnet board 7 is connected to the switch board 8. It is drilled so that it rotates intermittently.

In other words, the dial 1 is rotationally driven by the motor 2.
When the setter 3 engages with the magnetic disk 7, the magnetic disk 7 is rotated approximately 45 degrees by a snap action (not shown).

This snap action mechanism is well known, and includes a feed plate spring and a stopper on the lever rotated by the setter 3 of the dial 1, and a return spring that urges the lever to return to its original position. and a suspension wheel which is pushed by the feed plate spring and rotates when the lever is returned to its original position by the return spring, and a rotation stopper which has a pawl facing in the opposite direction and engages with the stopper to prevent inertial rotation. It is installed so that it rotates together with the hanging wheel.

For details, please refer to Utility Application No. 168810/1983 (Publication of Utility Model Application No. 85326/1983, Utility Model Registration No. 14)
58639q).

Therefore, the magnet 9 on the magnet plate 7 also rotates and moves to the top of the reed switch 10b, which is located at a position rotated 45 degrees from the top of the reed switch 10a, and at that time
0b is designed to be closed by magnetic action.

Returning to FIG. 2 again, 11 is a bridge circuit that generates a heating signal for turning on and off a heater (not shown), and is connected to a heat-sensitive element such as a thermistor 12 disposed in the controlled device, and a bridge circuit 11 for example 5 ( An impedance element, such as a variable resistor 14, and resistors 15 and 16, which is connected by a shaft 13a to a motor 13 for setting the environmental condition, that is, temperature, which rotates once between rotations, and continuously varies according to the characteristics of the environmental condition. Consisting of

17 is a bridge circuit that generates a drive signal for driving the motor 13, and the above-mentioned variable resistor 14 and resistor 16 are used on two sides of the circuit, and one on the other two sides is used.
A resistor 18 having the same resistance value as the resistors 15 and 16 is used on one side, and an impedance element for temperature setting, such as one of variable resistors 19a to 19d, is selectively used on the remaining side. It will be done.

The resistance values of these variable resistors 19a to 19d are set in advance in stages to values corresponding to the temperature of the temperature characteristics to be programmed and controlled, and are selectively switched by the above-mentioned reed switches 10a to 10d. .

The output side of the bridge circuit 11 is connected to an amplifier 20 provided to increase sensitivity to temperature changes, and the output side of the amplifier 20 is connected to the base of a transistor 22.

The collector of the transistor 22 is connected to the rectifying power supply circuit 2 via a relay 23 provided as a power supply switch for the heater.
4, and the emitter of the transistor 22 is connected to the other output end of the rectifying power supply circuit 24.

Further, the primary side of the transformer in the rectifying power supply circuit 24 is connected to the power supply terminals 5 and 6.

On the other hand, the output side of the bridge circuit 17 is connected to an amplifier 25 similar to the amplifier 20, and the output side of the amplifier 25 is connected to the base of a transistor 27.

The collector of the transistor 27 is connected to one output end of the rectifier power circuit 24 via a relay 29 that opens and closes a relay contact 28 inserted into the power supply path of the motor 13, and the emitter of the transistor 27 is connected to the other output end of the rectifier power circuit 24. connected to.

Next, the operation of the program control device according to the present invention will be explained.

Now, the temperature rise start time setting on the dial 1 by the plurality of setting elements 3 is, for example, from time t1 to t6 as shown in FIG.
Of these, the variable resistor 19 is set to tl, t3 and t3.
a to 19c are temperatures T1. at which temperature rise is desired to be stopped. T2 and T
Assume that it is set to 3.

After the operation starts, the temperature inside the controlled device is the initial temperature T.

The bridge circuit 11 also maintains a balanced state and its output is zero.

After passing through this initial state and reaching tl, the first setting element 3 of the dial 1 driven by the motor 2 is set to the magnetic plate 7.
The magnet 9 mounted on the magnetic board 7 is rotated by a predetermined angle, 45 degrees in this embodiment, and moved from above the reed switch 10a to the reed switch 10b of the switch board 8, and then stopped.

As a result, immediately after the reed switch 10a is opened, the
0b is closed, and an output, that is, a signal for driving the motor is generated on the output side of the bridge circuit 17.

This output is amplified by an amplifier 25 and then transferred to a transistor 27.
is supplied to the base of transistor 27, making this transistor 27 conductive.

Relay 29 is supplied by conduction of transistor 27,
When the relay contact 28 is closed, the motor 13 is driven to rotate.

Due to this rotational drive of the motor 13, the movable element of the variable resistor 14 is also rotated in proportion to this, and its resistance value changes, causing the bridge circuit 11 to become unbalanced and produce an output, that is, a heating signal, on its output side.

This output (which is amplified by the amplifier 20 and the transistor 22
is applied to the base of the transistor, making it conductive.

The relay 23 is energized by the conduction of the transistor 22,
Since the contact operates, the heater turns on and the temperature starts to rise due to the heat generated by the heater.

The temperature controller repeats the operation of turning the heater on and off, and the temperature inside the controlled device gradually rises toward the set temperature T1 at a rate of 1 to 2° C. per hour.

When the resistance value of the variable resistor 14 whose resistance value is varied by the motor 13 reaches a value corresponding to the set temperature T1, this value is changed to a value corresponding to the set temperature T1 in the bridge circuit which is preset to a value corresponding to the set temperature T1. Since the resistance value of the variable resistor 19b becomes equal to the resistance value of the variable resistor 19b, the bridge circuit 17 enters an equilibrium state.

As a result, the drive signal from the bridge circuit 17 disappears, so the transistor 27 becomes non-conductive, and the relay 29 is deenergized, which opens the relay contact 28 to cut off the power supply path of the motor 13 and stop driving the motor 13.

By stopping the drive of the motor 13, the rotation of the movable element of the variable resistor 14 is also stopped, and the resistance value of the variable resistor 14 is set to a value corresponding to the set temperature T.

Therefore, the on/off operation of the heater as described above is repeated at this set temperature T1, and the temperature inside the controlled device is kept constant at the set temperature T1 for a period of time t2 to t3.

Next, at the end of the duration of the set temperature T1, that is, at this time t3, the setter 3 of the dial 1, which has been set in advance as described above, engages with the stopped magnetic disc 7.
The magnet 9 is rotated to the next reed switch 10c and stopped.

As a result, the reed switch 10b is opened and then the reed switch 10C is closed, and a variable resistor 19c, which is preset to a value corresponding to the set temperature T2, is inserted on one side of the bridge circuit 17 instead of the variable resistor 19b. As a result, the equilibrium state of the bridge circuit 17 is disrupted and a drive signal is generated on its output side.

This drive signal causes transistor 27 to conduct in the same manner as described above, energizes relay 29 and closes relay contact 28, and drives motor 13 again.

As the motor 13 is driven, the movable element of the variable resistor 14 begins to rotate again and its resistance value changes, causing the bridge circuit 11 to become unbalanced and a heating signal appearing on its output side.

Then, in the same manner as described above, the transistor 22 becomes conductive, the relay 23 is energized, the heater is turned on, and the bridge circuit 1
The temperature inside the controlled device is gradually increased while repeating the operation in which the heater is turned off when the balance of 1 is achieved.

This temperature rising operation is performed until the set temperature T2 is reached, and the variable resistor 1
When the resistance value of the variable resistor 19C becomes equal to the value corresponding to the set temperature T2 and the resistance value of the variable resistor 19C, which is preset as described above, the bridge circuit 17 is balanced, and the motor 13 is activated in the same manner as described above. Drive stops.

By stopping the driving of the motor 13, the resistance value of the variable resistor 14 remains set to a value corresponding to the set temperature T2. Therefore, the temperature inside the controlled device reaches the set temperature T2 from time to time t5.
is held constant for a period of time.

Then, at the end of the duration of the set temperature T2,
At this time t, the motor 13 is driven by the final setter 3 of the dial 1 set in advance as described above, and the temperature inside the controlled device is gradually increased while repeating the on/off operation of the heater in the same manner as described above. The temperature is raised.

And the variable resistor 19d whose resistance value of the variable resistor 14 is preset to a value corresponding to the set temperature T3 as described above.
When the resistance value becomes equal to the resistance value of
The temperature inside the controlled device is kept constant at the set temperature T3 for a predetermined period of time after time t6.

In this way, a series of program controls in accordance with predetermined temperature characteristics is completed.

According to the program control device according to the present invention as described above,
The time transition points of various characteristics of the environmental state to be controlled are defined using a time setting dial, and the levels of various characteristics of the environmental state are defined and programmed using multiple environmental state setting impedance elements that can be switched in stages. Since the control is configured, program control can be automatically performed in accordance with the predetermined characteristics to be controlled, and labor can be saved.

Furthermore, the program control device according to the present invention can set the speed of the motor 13 for setting the environmental conditions to an arbitrary value, so it is possible to raise the temperature extremely slowly by, for example, increasing the temperature by 1 to 2°C per hour in the process of drying leaf tobacco. Even if the environmental conditions change due to the slope, the functions can be smoothly maintained.

Furthermore, since a variable impedance element can be used as the environmental condition setting impedance element, the environmental condition setting can be subtly changed and control accuracy can be improved.

Although the above-mentioned embodiments have been described using temperature as the environmental condition, it goes without saying that the present invention is not limited to this, and can be similarly applied to other environmental conditions such as humidity and flow rate.

In addition, although a case has been described in which a resistor is used as an impedance element connected to the second motor, that is, the motor 13, and is continuously varied according to the characteristics of the environmental condition, and an impedance element for setting the environmental condition, other impedance elements, such as A capacitor, an inductor, or a circuit combining these may also be used.

Furthermore, although the magnet panel 7 and the switch panel 8 are arranged concentrically with the dial 1, they can be arranged separately from the dial 1 if the setter 3 of the dial 1 and the magnet 9 of the magnet panel 7 engage as described above. It's okay.

Furthermore, the operating time of the time setting dial section used as a timer is not limited to 2 hours, and may be any time; for example, drying leaf tobacco usually takes 4 to 5 days;
Even if an instantaneous timer is used, continuous program control can be performed by removing the setter whose operation has ended and setting it again at the expected position.

Furthermore, if the 2-question timer is changed to a one-week timer, it is possible to control the entire program over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a characteristic diagram showing the temperature characteristics when drying leaf tobacco, FIG. 2 is a circuit diagram showing an embodiment of the present invention, and FIG. 3 is a diagram showing the main part of the present invention. 1 is a time setting dial, 2 and 13 are motors, 3 is a setter, 7 is a magnetic board, 8 is a switch board, 9 is a magnet, 10a to 10d are reed switches, 11 and 17 are bridge circuits, 14 and 19a to 19d is a variable resistor 22
, 27 are transistors, 23 and 27 are relays, and 28 is a relay contact.

Claims (1)

[Scope of utility model registration request] A time setting dial that is constantly rotationally driven by a first motor and has a plurality of setters corresponding to set times, and a continuously variable impedance element that is connected to a second motor and is connected to a second motor to create a required environmental state. and a plurality of environmental state setting impedance elements that are engaged with the setter and switched in stages at each set time set by the setter, respectively, to set the required environmental state. bridge circuit means constituting a bridge circuit together with an impedance element, and the rotary drive of the second motor is controlled by the output of the bridge circuit means in response to switching of the environmental state setting impedance element p. A program control device characterized by: