JPH0659916B2 - Liquid level control method and apparatus for filling machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a liquid level control method and apparatus for a filling machine, which maintains a constant liquid level in the filling machine.

(Prior Art) A conventional liquid level control device for a filling machine will be described with reference to FIG. 4. (50) is a filling machine (tank), (51) is a float, (52) is a valve, and (57) is a valve seat. , (53) control valve, (54) filling machine
Liquid transfer piping to (50), (55) (56) rotary seal, (58) pressure air source, (59) air filter, (60) (63) (65) air regu- lator, (61) pressure. Switch, (62) is controller, (6
4) (66) is a solenoid valve, (68) is a filter, (69) is a pressure air supply pipe, (70) is a pressure guiding pipe, and the filling liquid is a filter (68) → control valve (53) → liquid supply pipe ( 54) → It is sent to the filling machine (50) through the rotary seal (55), and is further filled in the container through the filling machine (50) through a filling valve (not shown). Also the same filling machine
The float (51) provided in the (50) moves up and down following the liquid level in the filling machine (50). A valve (52) is attached to the float (51) and moves up and down together with the float (51). When the liquid level rises and the float (51) rises, the valve (52) rises and sits on the valve seat (57), closing this portion. Further, when the liquid level descends and the float (51) descends, the valve (52) descends, separates from the valve seat (57), and opens this portion. This valve (52)
Also, in the valve seat (57), an air filter (59) from the pressure air supply source (58) → an air regulator (air regulator that regulates the pressure air to a constant pressure) (60) → a pressure air supply pipe (69)
→ Pressure air is supplied through the rotary seal (56), and the pressure air supply pipe (69) is equipped with a pressure switch (61) operated by air pressure, and the operation signal of the pressure switch (61) is controlled. The control signal obtained by the controller (62) is sent to the solenoid valve (64) (66), the solenoid valve (64) (66) is controlled, and the pressure air is pressurized. From the air supply source (58) to the air filter (59) → air regulator (air regulator that regulates the pressure air to a constant pressure) (63) (65) → solenoid valve (64) (66) → pressure control pipe (70) It is sent to 53) and the control valve (53) is controlled. Now, when the liquid level in the filling machine (50) is sufficiently high, the valve (52) is closed and the pressurized air supply pipe (6
The pressure in 9) is equal to the set pressure of the air regulator (60), the pressure switch (61) is in the off (or on) state, and the controller (62) is open to the solenoid valve (64). A control signal is sent, the control valve (53) is opened at an opening proportional to the set pressure of the air regu- lator (63) (the opening that allows the filling liquid to flow at a flow rate less than that required by the filling machine), and the filling machine ( 50)
The amount of liquid to be supplied to the filling machine (50) decreases and the liquid level of the filling machine (50) drops.
Further, when the liquid level of the filling machine (50) descends, the float (51) descends, the valve (52) is opened, and pressurized air starts to flow in the pressurized air supply pipe (69). The pressure in (69) drops, and the pressure switch (61) switches to the on (or off) state. At this time, the obtained operation signal is sent to the controller (62), and the controller (62) Sends a closing control signal to the solenoid valve (64) to close the solenoid valve (64) and sends an opening control signal to the solenoid valve (64) to open the solenoid valve (64) for control. The valve (53) is opened at an opening proportional to the set pressure of the air regu- lator (65) (the opening that allows the filling liquid to flow at a flow rate higher than that required by the filling machine), and the liquid is sent to the filling machine (50). As the amount increases, the liquid level in the filling machine (50) rises.

(Problems to be Solved by the Invention) The present invention is proposed in view of the above problems, and an object of the present invention is to reduce the liquid level fluctuation in the filling machine.
Further, the liquid level of the filling machine can be easily changed. Further, another object of the present invention is to provide a liquid level control method and device for a filling machine, which can eliminate the need for pressure adjustment operations such as a pressure switch and an air regulator, which have been performed every time the type of container changes.

(Means for Solving the Problems) In order to achieve the above object, the liquid level control method for a filling machine according to the present invention is such that, during unsteady operation, the liquid level height from a liquid level detection unit attached to the filling machine is high. Is sent to the calculator of the controller to calculate the required liquid flow rate to the filling machine and the calculation result is unsteady.・ Send to the upper / lower limit limiter via the steady switching switch, check here whether or not the calculation result of the required liquid flow rate is appropriate, and check whether it is below the upper limit value or above the lower limit value set in advance in the upper / lower limit limiter. In some cases, the calculation result is sent as an opening signal to the control valve attached to the liquid delivery pipe, and when the above calculation result is larger than the upper limit value preset in the upper and lower limiter, the same upper limit value is returned, and the above calculation result is also returned. Is preset in the upper and lower limiters When the value is smaller than the lower limit value, the lower limit value is sent to the control valve as an opening signal, and during steady operation, the calculation result of the calculator is sent to the flow controller of the controller via the unsteady / steady switching switch. At the same time, the filling machine operating state detection signal from the filling machine controller is sent to the same flow rate controller, the opening of the control valve is calculated here, and the calculation result is sent to the upper / lower limit limiter via the unsteady / steady switching switch. , Check here whether the control valve opening calculation result is appropriate, and if the calculation result is below the upper limit value and above the lower limit value set in advance in the upper and lower limiter, send the calculated result as the opening signal. When it is sent to the control valve attached to the pipe and the above calculation result is larger than the preset upper limit value in the upper / lower limit limiter, the same upper limit value is set, and the above calculation result is set in the upper / lower limit limiter. It is smaller than the lower limit value set because the the same lower limit, by sending a position signal to said control valve, is characterized by controlling the liquid feed flow to the filling machine.

Further, the liquid level control device for a filling machine of the present invention includes a liquid level detection unit attached to the filling machine, a flow rate detection unit attached to a liquid supply pipe to the filling machine, a filling machine control unit, and a feeding machine to the filling machine. It has a control valve attached to the liquid pipe and a controller, which controls the liquid level detection signal proportional to the liquid level height from the liquid level detection unit and the filling machine operating state from the filling machine control unit. A calculator that calculates the required liquid flow rate to the filling machine based on the detection signal, and a flow rate that calculates the opening of the control valve based on the calculation result of the calculator and the actual liquid flow rate detection signal from the flow rate detection unit. Check whether or not the calculation results of the controller and the same flow rate controller are appropriate, and when the calculation results are below the upper limit value and above the lower limit value set internally, the calculation result is sent to the liquid delivery pipe as an opening signal. It is sent to the attached control valve, and the above calculation results are preset inside When larger than the value is the same upper limit value,
Further, when the calculation result is smaller than a preset lower limit value, the same lower limit value is sent to the control valve as an opening signal and an upper and lower limit limiter, and when it is unsteady, the calculator and the upper and lower limit limiter are connected. It is constituted by an unsteady / steady operation switching switch which connects the above-mentioned computing unit, the above-mentioned flow rate controller, and the above-mentioned upper and lower limit limiter to each other during the steady operation.

(Operation) The liquid level control method for the filling machine according to the present invention is configured as described above, and the liquid level detection signal proportional to the liquid level height from the liquid level detection unit attached to the filling machine is provided during the unsteady operation. And the filling machine operating state detection signal from the filling machine control section are sent to the computing unit of the controller, where the required liquid flow rate to the filling machine is calculated, and the calculation result is passed through the unsteady / steady switching switch. Send to the lower limiter, check here whether or not the calculation result of the required liquid supply flow rate is appropriate, and open the calculation result if it is below the upper limit value or above the lower limit value set in advance in the upper limiter. It is sent as a signal to the control valve attached to the liquid sending pipe, and when the above calculation result is larger than the upper limit value preset in the upper and lower limit limiter, the same upper limit value is set, and the above calculation result is preset in the upper and lower limit limiter. If it is less than the lower limit The same lower limit value is sent to the control valve as an opening signal, and during steady operation, the calculation result of the calculator is sent to the flow controller of the controller via the unsteady / steady switching switch and from the filler controller. Send the filling machine operation status detection signal to the same flow rate controller, calculate the opening of the control valve here, and send the calculation result to the upper / lower limit limiter via the unsteady / steady switching switch, and open the control valve here. Check whether the calculation result is appropriate or not, and if it is below the upper limit value or above the lower limit value set in advance in the upper and lower limiters, the calculated result is used as an opening signal to the control valve attached to the liquid supply pipe. When the calculation result is larger than the upper limit value preset in the upper / lower limit limiter, the same upper limit value is output, and the calculation result is lower than the lower limit value preset in the upper / lower limit limiter. The same lower limit value when Sai,
It is sent to the control valve as an opening signal to control the flow rate of liquid sent to the filling machine.

(Embodiment) Next, a liquid level control method and apparatus for a filling machine according to the present invention will be described with reference to one embodiment shown in FIG. 1. (1) is a filling machine (tank), (2) is a float, (3) Is a displacement transmitter of the same float (2), (4) is a control valve, and (5) is a filling liquid for the above filling machine.
Liquid delivery pipe to send to (1), (6) flow meter, (23) same flow meter (6)
Actual liquid flow rate detection signal from (7) is rotary seal, (8)
Is a liquid level detection signal from the displacement transmitter (3) of the float (2), (9) is a filling machine control unit, and the same filling machine control unit (9) operates / stops the filling machine (1), The operating condition of the filling machine (1) such as the operating speed, the capacity of the filling container (bottle), the presence or absence of the container in the filling machine (1), etc. is detected, and the operating condition detection signal (10) of the filling machine obtained at that time is detected. ) Is sent to the arithmetic unit (16) of the controller (13). Further, (14) is a flow meter controller of the same controller (13), (15) is an upper / lower limit limiter, (17) is the calculator (16), the flow controller (14), and the upper / lower limit limiter (15). ) Is a non-steady-state, steady-state switching switch that sends and receives signals to and from
Based on the liquid level detection signal (8) and the filling machine operating state detection signal (10), the required liquid flow rate to the filling machine (1) or the control valve opening at the time of starting / stopping the filling is calculated. Further, the flow rate controller (14) is provided with a required liquid flow rate to the filling machine (1) calculated by the arithmetic unit (16) and an actual liquid flow rate detection signal (23) detected by the flow meter (6). ) Calculates the required opening of the control valve (4). The upper and lower limiter (15) above is a flow controller.
(14) Or, it is checked whether the calculation result calculated by the calculator (16) is proper, and if it is proper, the control valve opening (18) is output to the control valve (4).

Next, the operation of the liquid level control device of the filling machine shown in FIG. 1 will be specifically described. When the filling machine (1) is in the steady operation state, the computing unit (16) detects the liquid level detection signal (8) from the displacement transmitter (3) and the filling machine operation state from the filling machine control unit (9). signal
Calculate the required liquid delivery flow rate SV from (10) using the following equation.

SV = R · V−K (H−H ₀ ) A ... where R is the operating speed of the filling machine, V is the filling capacity per filling container, K is the operating speed of the filling machine and A constant determined from the filling capacity per filling container, H is the actual liquid level of the filling machine, H ₀ is the set liquid level of the filling machine, and A is the average cross-sectional area of the filling machine (tank). .

The flow controller (14) uses the required liquid flow rate SV calculated by the above equation as the target value, and the actual liquid flow rate detection signal (23) from the flow meter (6) as the measured value, and the control valve (4) Calculate the opening degree of.

Further, during unsteady operation such as starting and stopping of filling, the calculator (16) controls the opening degree of the control valve (4) by the operating speed of the filling machine and the filling capacity per container.
Calculation is performed so that the set value set in advance is obtained.

Switching from the unsteady operating state to the steady operating state is
As shown in Fig. 2, the opening of the control valve (4) calculated by the calculator (16) during unsteady state and the flow rate controller during steady state operation.
The difference from the opening of the control valve (4) calculated in (14) is
The controller must be within a certain deviation ΔE for a certain time T ₁ or more.
Judgment is made in (13), and switching is performed by switching the non-steady / steady switching switch (17). During steady operation, the unsteady / steady switching switch (17) is in the position a in FIG. 1, and during unsteady operation, the switch (17) is in position b in FIG.

The opening value of the control valve (4) obtained by the above procedure is
The upper and lower limiter (15) checks whether or not it is the appropriate opening value of the control valve (4) calculated from the operating speed of the filling machine and the filling volume per container, and the opening value is set to the upper and lower limits. When it is below the upper limit value and above the lower limit value set in advance in the limiter (15), the opening value is sent to the control valve (4) as an opening signal, and the opening value is set to the upper and lower limiter (15).
If the opening value is smaller than the lower limit value preset in the upper limit limiter (15), the same upper limit value is set as the opening signal when the control valve ( Send to 4).

The flow controller (14) upper / lower limit limiter (15) computing unit (16) switch (17) may use an external device different from the controller (13). Further, when the operation is changed from the unsteady operation to the steady operation, the control valve opening just before the stop of the filling is stored as shown in FIG. 3, and when the filling is started again, the control valve ( You may open 4) and start steady operation. Further, in order to detect the liquid level inside the filling machine (1), a detection signal proportional to the liquid level like an electric level switch is sent in addition to the transmitter (3) having the float (2). You can change to anything.

(Effect of the Invention) The liquid level control method for a filling machine of the present invention is configured as described above, and during unsteady operation, the liquid level proportional to the liquid level from the liquid level detection unit attached to the filling machine is used. The surface detection signal and the filling machine operating state detection signal from the filling machine control section are sent to the calculator of the controller, where the required liquid flow rate to the filling machine is calculated, and the calculation result is switched to the unsteady / steady state switch. To the upper / lower limit limiter, and check here whether or not the calculation result of the required liquid flow rate is appropriate, and if it is below the upper limit value or above the lower limit value preset in the upper / lower limit limiter, calculate The result is sent as an opening signal to a control valve attached to the liquid sending pipe, and if the above calculation result is larger than the upper limit value set in advance in the upper and lower limiter, the same upper limit value is set, and the above calculation result is the upper and lower limit limiter. Less than the lower limit set in advance If this is the case, the same lower limit value is sent to the control valve as an opening signal, and during steady operation, the calculation result of the above computing unit is sent to the flow rate controller of the controller via the unsteady / steady switching switch and the filling machine control is performed. The operation signal of the filling machine from the container is sent to the same flow rate controller, the opening of the control valve is calculated here, and the calculation result is sent to the upper and lower limiter via the unsteady / steady switching switch and controlled here. Check whether or not the valve opening calculation result is appropriate, and if it is below the upper limit value or above the lower limit value preset in the upper and lower limiter, the calculation result is attached to the liquid delivery pipe as an opening signal. When it is sent to the control valve and the above calculation result is larger than the upper limit value set in the upper and lower limit limiters, the same upper limit value is set, and the above calculation result is the lower limit set in the upper and lower limit limiters in advance. The same lower limit is smaller than,
As the opening signal is sent to the control valve to control the flow rate of the liquid to be fed to the filling machine, the amount of liquid to be fed to the filling machine can be controlled steplessly, and the amount of liquid to be fed can be controlled without hunting. The liquid level fluctuation in the filling machine can be reduced.

Moreover, since the actual amount of liquid delivered to the filling machine is detected as described above and the amount of liquid delivered to the filling machine is controlled, the liquid in the filling machine that was generated based on the variation in the liquid delivery resistance of the liquid delivery pipe. Surface variation can be reduced.

Further, the liquid level in the filling machine may be set by the filling machine control unit as described above, and the liquid level of the filling machine can be easily changed.

Further, unlike the conventional case, the pressure switch, the air regulator, etc. are not used, and the pressure adjustment operation by the pressure switch, the air regulator, etc., which is required every time the type of the container changes, can be eliminated.

Also, during non-steady state, the switch of the controller and the upper and lower limit limiter are connected during non-steady state by the switch for non-steady state / steady state switching.
At the time of steady operation, the arithmetic unit of the controller, the flow rate controller, and the upper limit limiter are connected, so that the control suitable for each can be easily selected.

Further, the liquid level control device for a filling machine of the present invention includes a liquid level detection unit attached to the filling machine, a flow rate detection unit attached to a liquid supply pipe to the filling machine, a filling machine control unit, and a feeding machine to the filling machine. It has a control valve attached to the liquid pipe and a controller, which controls the liquid level detection signal proportional to the liquid level height from the liquid level detection unit and the filling machine operating state from the filling machine control unit. A calculator that calculates the required liquid flow rate to the filling machine based on the detection signal, and a flow rate that calculates the opening of the control valve based on the calculation result of the calculator and the actual liquid flow rate detection signal from the flow rate detection unit. Check whether or not the calculation results of the controller and the same flow rate controller are appropriate, and when the calculation results are below the upper limit value and above the lower limit value set internally, the calculation result is sent to the liquid delivery pipe as an opening signal. It is sent to the attached control valve, and the above calculation results are preset inside When larger than the value is the same upper limit value,
Further, when the above calculation result is smaller than the lower limit value set inside beforehand, the same lower limit value is sent to the control valve as an opening signal, and the upper and lower limit limiter which sends it to the control valve, and when it is unsteady In the connected steady operation, the operation unit, the flow rate controller, and the unsteady / steady operation switching switch that connects the upper / lower limit limiter are connected, and the liquid level control method of the filling machine can be smoothly implemented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram showing one embodiment of a liquid level control device used for carrying out the liquid level control method for a filling machine according to the present invention, and FIGS. 2 and 3 show its operation. FIG. 4 and FIG. 4 are system diagrams showing a liquid level control device for a conventional filling machine. (1) …… Filling machine, (2), (3) …… Liquid level detector, (8) …… Liquid level detection signal, (4) …… Control valve, (5) …… Liquid supply pipe,
(6) …… Flow rate detector, (23) …… Actual liquid flow rate detection signal, (9)
…… Filler control unit, (10) …… Filler operating status detection signal,
(13) …… Controller, (14) …… Flow controller, (15) …… Upper / lower limit limiter, (16) …… Calculator, (17) …… Unsteady / steady state switching switch, (18)… … Control valve opening signal.

Claims (2)

[Claims] 1. At the time of unsteady operation, a liquid level detection signal proportional to a liquid level height from a liquid level detection unit attached to a filling machine and a filling machine operating state detection signal from a filling machine control unit are sent to the controller. Send to the calculator, calculate the required liquid flow rate to the filling machine, and send the calculation result to the upper / lower limit limiter via the unsteady / steady state switching switch. Check whether or not there is, and when it is below the upper limit value and above the lower limit value set in advance in the upper and lower limiter, send the calculation result as an opening signal to the control valve attached to the liquid delivery pipe, and the above calculation result Is greater than the preset upper limit in the upper and lower limit limiter, the same upper limit value, when the above calculation result is less than the preset lower limit value in the upper and lower limit limiter, the same lower limit value as the opening signal Send to the above control valve During steady operation, the calculation result of the above arithmetic unit is sent to the flow rate controller of the controller via the unsteady / steady state switching switch, and at the same time, the filling machine operating state detection signal from the filling machine controller is sent to the same flow rate controller. The control valve opening is calculated, and the calculation result is sent to the upper / lower limit limiter via the unsteady / steady state switching switch, where it is checked whether the control valve opening calculation result is proper or not. When the value is below the preset upper limit value or above the lower limit value in the lower limiter, it sends the calculation result as an opening signal to the control valve installed in the liquid supply pipe, and the calculation result is the upper limit set in the upper and lower limiters. If it is larger than the above value, the same upper limit value is used.If the above calculation result is smaller than the lower limit value preset in the upper and lower limit limiter, the same lower limit value is used as the opening signal. And sent to the valve, liquid level control method of the filling machine is characterized in that controlling the liquid feed flow to the filling machine. 2. A liquid level detection unit attached to the filling machine, a flow rate detection unit attached to a liquid feed pipe to the filling machine, and a filling machine control unit.
It has a control valve attached to the liquid supply pipe to the filling machine and a controller, and the controller is provided with a liquid level detection signal proportional to the liquid level height from the liquid level detection section and the filling machine control section. From the filling machine operating state detection signal to calculate the required liquid flow rate to the filling machine, and to open the control valve based on the calculation result of the calculator and the actual liquid flow rate detection signal from the flow rate detection unit. Check the flow rate controller that calculates the degree and whether or not the calculation result of the flow rate controller is appropriate, and if it is below the upper limit value or above the lower limit value set internally, the calculation result is the opening signal. When the above calculation result is larger than the preset upper limit value, the same upper limit value is set, and when the calculation result is smaller than the preset lower limit value, Is the same lower limit value as the opening signal Unsteady / steady operation in which the upper / lower limit limiter sent to the trawl valve is connected to the above computing unit and the above upper / lower limit limiter in the unsteady state, and the above computing unit, the flow rate controller and the upper / lower limit limiter are connected in the steady operation. A liquid level control device for a filling machine, which is configured by a switching switch.