JPS6219279A - Method and device for controlling amount of compound to be coated - Google Patents

Abstract

PURPOSE:To coat stably and to obtain the uniform quality by continuously calculating the weight of a compound film when a compound soln. is injected, comparing the calculated value with an optimum value and automatically regulating a pressure valve on the basis of the result. CONSTITUTION:The flow rate of the compound soln. flowing from a compound soln. tank 1 to a nozzle is continuously measure by an electromagnetic flow meter 4 and the lining speed is continuously measured by a rotor meter 12. The weight of the compound film is calculated by a controller 8 on the basis of the signal from the electromagnetic flow meter 4 an the signal from the rotor meter 12, the calculated value is compared with the set value of the compound film weight, a control signal is outputted and the lining pressure is regulated by the control signal of the controller 8 by an electropneumatic proportional valve 6. Consequently, stable coating can be carried out and the uniform quality can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Use in Childcare The present invention is applied when applying a compound to the seaming part of a can lid. The present invention relates to a compound application amount control method and device for automatically controlling k.

Conventional technology In order to seal the can lid with the can body, the seaming part of the can lid is completely coated with a compound. If the amount of compound is insufficient, the seal will be incomplete, and if there is too much compound, the compound will be exposed inside and outside the can, resulting in defective cans, so maintain the amount of compound wood applied accurately. is the most important matter in the can lid manufacturing process.

To apply the compound to the seaming portion of the can lid, the compound is applied from a compound liquid tank 1 through a nozzle 3 in a liner L as shown in FIG. Air is supplied to the compound tank 1 via a vibrator 5, and its pressure (hereinafter referred to as lining pressure) is adjusted by a pressure valve 6 to adjust the amount of injection from the nozzle.

However, even if the lining pressure is constant, it varies depending on the concentration and viscosity of the compound liquid sprayed from the nozzle, and there is always variation.

In particular, viscosity is affected by changes in temperature, and constantly fluctuates due to changes in the environment, such as when starting a machine, turning during operation, and changes in temperature during morning, noon, and night. Therefore, in the past, the weight of the compound film after applying the compound solution (the weight of the compound film at the seaming area after being heated in a heating furnace) was measured approximately every two hours, and the pressure valve was adjusted each time based on the results. The application of the compound liquid is controlled by However, the adjustment of the pressure valve is done manually, taking into account the above conditions based on many years of experience, and is therefore one of the most difficult tasks that can only be performed by skilled workers.

Problems that the invention aims to solve As mentioned above, the amount of compound applied changes considerably depending on the environment, so the pressure valve is fully adjusted by hand in response to this, but the amount of applied compound is always maintained at a constant and appropriate level. It was difficult to do so, and the adjustment work was also a time-consuming task that required skill.

Furthermore, the compound film weight must be measured each time, which significantly reduces work efficiency.

The present invention was devised in view of the above circumstances, and its purpose is to continuously calculate the compound film weight' during compound liquid injection, compare it with an appropriate value, and adjust the pressure valve based on the result. An object of the present invention is to provide an automatic compound application amount control device that can automatically adjust K1I4.

Means to solve problems FIG. 1 is a schematic explanatory diagram of the present invention.

In the figure, reference numeral 1 denotes a compound liquid tank, and the compound liquid is injected from a nozzle 3 through the tank 1 through piping 2, and is applied to the can lid seaming portion on the liner head. Since the amount of compound liquid sprayed from the nozzle 3 depends on the pressure of the air introduced into the compound liquid tank through the pipe 5, the amount of compound liquid sprayed can be controlled by adjusting the pressure.

Therefore, the present invention is based on the premise that if the amount of compound liquid supplied to the nozzle through the pipe 2 is constant, the compound film weight is also constant, and the flow rate of the pipe 2 is constant. The aim is to control the air pressure supplied to the tank.

The compound film weight can be calculated using the following formula.

Here, FW: Compound film weight [mg
Z sheets] T3: Solid fraction of compound liquid SGe: Specific gravity of compound liquid Since the solid fraction T8 and the compound liquid specific gravity SG have a predetermined value depending on the type of compound liquid, the compound film weight FW changes depending on the compound liquid flow IQ and the lining speed S of the liner. Therefore, by measuring the flow tQ and the lining speed S at a certain point, the compound film weight Fvtd" at that point can be determined, so the flow tQ is changed so that the two match while comparing the compound film weight with the appropriate value. You can always apply the right amount of compound.

The present invention is based on the above principle, and the first invention continuously measures the flow rate of the compound liquid flowing into the nozzle and the lining speed, and continuously calculates the compound film weight. The calculated value is compared with a preset compound film weight setting@, and the lining pressure is automatically adjusted based on the comparison.

The second invention is an apparatus for implementing the first invention, which includes an electromagnetic flowmeter 4 that continuously measures the compound liquid flow rate from the compound liquid tank l to the nozzle 3, and a lining speed that continuously measures the compound liquid flow rate from the compound liquid tank l to the nozzle 3. The tachometer 12 to be measured, the setting value of the compound film weight, the solid fraction T8 of the compound liquid, the compound liquid specific gravity SGe, and the correction coefficient α are input in advance. a controller 8 that calculates the currently applied compound film weight by manually performing the first measurement shift of the ffl flowmeter 4 and the tachometer 12, and outputs a control rjIIJ signal to match the set value; and an electro-pneumatic proportional valve 6 that adjusts the compound application pressure based on control signals from the valve.

The electromagnetic flow meter 4 continuously measures the compound liquid flow rate Q, and the monthly rotation meter 12 continuously measures the lining speed S, and these measured values are input to the controller 8. The controller 8 has the set value of the compound film weight and the solid fraction Ts of the compound liquid in advance.
Since the compound liquid specific gravity SGe and the correction coefficient α have been input, the compound film weight Fw is calculated based on the above formula by inputting each of the measured values. Then, the controller 8 performs the calculation rra
A control fill signal for controlling the electro-pneumatic proportional valve is applied to the power proportional valve via the v//1 conversion power amplifier 15 so that the Fw should maintain the set value.

The electropneumatic proportional valve 6 automatically adjusts the lining pressure in response to a control signal from the controller 8.

Embodiment FIG. 2 is a block diagram of an embodiment of the present invention. In the figure, broken line arrows indicate the flow of electrical signals, and solid line arrows indicate the flow of air and compound liquid.

This is a 4Fi electromagnetic flowmeter that measures the compound liquid flow in piping.
It continuously measures the volumetric flow rate, and by amplifying the electromotive force proportional to the uniform flow velocity and amplifying the electromotive force in the flow rate converter 9, an electric signal corresponding to the volumetric flow rate is input to the controller 8 and displayed digitally. The flow rate is displayed in total 23.

Reference numeral 11 is a sensor for a digital tachometer 12 for measuring the liner construction and lining speed. The signal from the digital tachometer 12 is converted into an analog signal by an analog converter 13 and input to the controller 8 .

The controller 8 is a well-known programmable controller,
It is configured to perform composite control by combining signal calculation, sequence calculation, and control 111I. The controller 8 is configured to input the compound film weight setting (directly, compound liquid solid fraction) from the keyboard.
8. Compound liquid ratio 7iSGe and correction coefficient α can be input. timer 10
is provided to slightly delay the control start from the lining start due to the time constant of the flowmeter. Further, the recorder 22 records the flow rate, calculation results, etc.

15 FiV/l conversion power amplifier, 6 is an electro-pneumatic proportional valve, which automatically adjusts the lining pressure upon receiving a command from the controller 8.

In addition, 17 is a filter, 18 is a regulator,
These are connected to the air supply pipe to the compound liquid tank 1. Further, 21 is a strainer, which is provided in the piping to remove foreign matter from the compound liquid.

Furthermore, 1゛9 is a digital pressure gauge that displays the lining pressure, and 20 is a digital pressure gauge that displays the lining pressure, and 20 is to find out if one of the four nozzles installed on the liner is malfunctioning and the lining pressure fluctuates rapidly. It is a meter relay.

The operation of the control device configured as described above will be explained next.

An electromotive force proportional to the uniform flow velocity is induced in the electromagnetic flowmeter by the compound liquid flow in the pipe 2, and this electromotive force is amplified by the flow rate converter 9 and converted into a volumetric flow rate. The land liquid flow IQ is measured and this measured value is input to the controller.Furthermore, the lining speed S is measured with a digital tachometer provided on the liner L, and the first measurement shift is input to the controller 8.On the other hand, , the controller 8 has the setting end of the keyboard compaction film weight, and the solid fraction T of the compounding liquid.
8. Konno (land liquid ratio type SGe and correction coefficient α are input in advance.

Then, according to the program, the controller 8
The compound film weight FW is calculated based on the above formula, the target value of the land filler weight is compared with the calculated value, and the electro-pneumatic proportional valve is controlled according to the magnitude of the change. A signal is applied to the power proportional valve 6 via the V/1 conversion power amplifier 15.At the same time, this t
, o M 11111 is placed in the recorder 22.

The lining pressure is automatically adjusted by the control signal from the electro-pneumatic proportional valve 611t controller 8. The lining pressure is displayed on a digital pressure gauge 19.

In order to eliminate the time constant of the flow meter at the time of the lining start, the timer 10 is set so that the control start is delayed by approximately 30 seconds from the lining start.

Additionally, if one of the four nozzles installed on the liner becomes clogged or otherwise malfunctions, the lining pressure will change rapidly, causing the 1-meter relay 20
is activated and issues an alarm.

Effect The present invention is characterized by measuring the liquid flow t, which is unrelated to the viscosity of the compound liquid, and automatically adjusting the lining pressure using this as a parameter. Compared to manually adjusting the lining pressure, this method has the following remarkable effects:

(1) FIG. 3 shows the control system mf! of the present invention. : Compound film weight settings for the case where the compound is applied by using (B) and the case where the compound is applied by adjusting the lining pressure by a conventional manual worker (A) [(
70mg). As is clear from the figure, according to the present invention, there is little variation in the compound film weight (one-fifth of that of the conventional method), and stable coating can be performed, making it possible to obtain uniform quality and eliminate non-standard materials. The product becomes zero.

(2) The lining pressure is automatically adjusted.

Unlike conventional methods, there is no need to regularly measure the compound film weight, no need to manually adjust the lining pressure accordingly, and no need to stop the line for inspection, resulting in labor savings. It is possible to achieve this and increase operating efficiency.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a graph showing variations in film weight. In the case of , '5r is shown. l: Compound liquid tank 2: Piping 3: Nozzle 4: Electromagnetic flow meter 5: Pipe 6: Electro-pneumatic proportional valve 8: Controller 9: Flow rate converter 10: Timer 11: Sensor for tachometer 12: Digital tachometer 13; Analog Converter 15: V/1 conversion power amplifier 20: Meter relay Patent applicant: Toyo Seikan Co., Ltd. Patent attorney: Fumi Sato (and 2 others)
given name)

Claims (1)

[Claims] 1) The compound film weight is continuously calculated by continuously measuring the compound liquid flow rate flowing out from the compound liquid tank to the nozzle and the lining speed, and the compound film weight is calculated based on the calculated value and the preset compound film weight. A compound application amount control method characterized in that the lining pressure is automatically adjusted based on the comparison result with a set value. 2) An electromagnetic flowmeter that continuously measures the flow rate of the compound liquid flowing out from the compound liquid tank to the nozzle, a tachometer that continuously measures the lining speed, a signal from the electromagnetic flowmeter, and a signal from the tachometer. A controller that calculates the compound film weight based on the compound film weight, compares it with the compound film weight set value, and outputs a control signal, and an electropneumatic proportional valve that adjusts the lining pressure based on the control signal from the controller. Features: Compound application amount control device.