JPS5840170A - Flow coater - Google Patents

Abstract

PURPOSE:To enable to continually control a flow amount at a fixed value without the need of hands, by controlling the flow amount of paint to be fed out to the head of a flow coater with increase or decrease the rotation number of a motor for a circulating pump. CONSTITUTION:Paint is fed out from a paint tank 12 to the head 3 of a flow coater by circulating pump 2, and the flow amount of the fed-out paint is measured by a flow meter 5 and fed out as an analog voltage value to a comparing part 6. The comparing part 6 compares said measured value with a preset reference value in a comparator 21 and controls the rotation number of a motor 1 for the circulating pump 2 on the basis of the comparison result at a controlling part 7 into which a comparing signal P is inputted. When the measured value is larger than the preset one, the rotation number of the motor 1 is decreased. When the measured value becomes smaller than the preset one because of the resistance of a coupling pipe, the plugging a filter 16, etc., the rotation number of the motor 1 is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a curtain type spray coater Kl! having an automatic flow rate control device. It is something to do. A conventional example is shown in FIG. That is, the circulation pump (2) driven by the Ao-Yu full sends the paint to the flow coater head (3), and the paint flows down from the flow coater head (3) to the so-called curtain 2, and then flows into the flow coater head (3). ) The paint is applied to the object to be coated (4) that is being transported below. In this conventional example, in order to control the amount of coating on the object (4) from 0 to 1b, KFi, for example, a stopwatch (
The so-called volumetric method, in which the amount of paint accumulated in the measuring cup 18) is measured while measuring the measuring time in step 91, and the method in which paint is applied to an iron plate α, which is a pseudo object to be coated, and the weight before and after application is measured with a scale. There is a so-called gravimetric method, and in both cases, the measurement is carried out manually and the flow rate of the paint sent out from the circulation pump (2) is adjusted by adjusting the flow rate regulating valve (11). However, this conventional example has disadvantages in that it requires human labor to measure the flow rate and is not very good at adjusting the flow rate, making it impossible to always obtain a stable coating flow rate. - The present invention addresses the above points, and by freely adjusting the coating flow rate, the accuracy of flow rate adjustment is improved without requiring manual labor.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention, which aims to provide a flow coater coating that always provides a stable coating flow rate, will be described in detail based on illustrated embodiments. In the 70-coater coating side of the present invention, the paint is sent to the flow coater head (3) by the circulation pump (2) driven by the °C temperature (1), and is transferred below the flow coater head TS+. A flow meter (tI) for measuring the flow rate of the paint sent from the circulation pump (2) to the flow coater head (3) is installed next to the flow coater that is used to apply the paint to the object to be coated (4). A comparison part tel is provided that compares the measured value of the flow meter is) with a preset flow rate set value and outputs a comparison signal (F), and outputs this comparison signal (G) to determine whether the measured value is the set value. When in a greater hurry, reduce the rotation speed of the circulation pump (Rinode Ichiyo (1) and -5 (1) when the measured value is smaller than the set value.
) to increase the rotation speed of the footer head iml.
K A control unit (7
) section will be explained in more detail. Trout 0 is a paint tank,
Paint is automatically replenished from the paint tank (+4) by the paint replenishment pump O1, and the level is controlled at a constant level.Circulation pump (2) #i Paint tank (from 14 to 70-
Paint is sent to the coater head (3), and the rotation speed of -911) can be increased or decreased from K to 70- using the built-in guidance.
The flow rate of paint delivered to the coater head can be adjusted. A filter (
A flow meter (+1) is provided. The above-mentioned flow meter (1), which consists of an electromagnetic flow needle, converts the measured value of the paint flow rate into an analog voltage value, and this analog voltage value is recorded in the record meter (1). Also, this analog voltage value is sent to the ^-D converter 01K constituting the comparator section 1B), converted to f-digital value, and displayed on the flow rate display +1-.-force, the comparator section till is equipped with a flow rate setting device that allows the flow rate to be set in advance from the outside, and the set value is displayed digitally on this flow rate setting device.Then, the kl! constant value and the set value are compared with the comparator 1). and outputs a comparison signal (P5).The slope is a flow rate abnormality alarm that issues an alarm when the flow rate becomes abnormally large or small. The rotation speed setting device 1 outputs the comparison signal (P), and if the measured value of the flow rate is larger than the set value, the color changes. According to the difference, nine rotation speed control signals (Q
is sent to the V-F converter, and v-? Converter - Changing the frequency of the 3II AC voltage which determines the rotational speed of the induction converter (1). For example, -5 (1) in the current induction is AC
200V, 50)1. It is driven by three AC voltages, and depending on the difference between the measured value and the set value, 458, 408,
By continuously converting the frequency, the number of revolutions (1) is reduced overnight. Conversely, when the measured value of flow rate is smaller than the set value, 55Hi, 6
0i (by increasing t and frequency, the rotational speed of f1+ can be increased overnight. Therefore, the flow rate of the paint sent out by the circulation lK pump (2) of the flow coater head) becomes approximately constant. - is awn (
1) is a rotational speed measuring device, and the rotational speed of this rotational speed liquid output lS- is preset with the rotational speed of the steep ℃-tile+ and the rotational speed lower limit setting device - and upper limit setting device &'? The comparator t221 compares the lower limit and upper limit of the number of revolutions set by lK, and when the number of revolutions of the first part (1) exceeds the lower limit and the first limit, an alarm is issued! It drives the S wire to notify Ichiyo (1) of the abnormality. - is a return column for returning excess paint flowing out from the flow coater head (3) to the paint tank (IIK).

FIG. 3 is a schematic configuration diagram showing the relationship between the flow rate (b) of the connecting pipe (+@) and the amount of cloth applied to the actual object 14 (2), where t is the object to be coated. (4) Length, I is paint specific gravity, M
When is the coating area, V is the ampere speed (constant), and α is the paint flow length of the flow coater head (3), = RH
(βgo is constant) is established, and it is proportional to the amount of water (2) and the amount of water (2). Therefore, by controlling the rotational speed of the at@, that is, the rotational speed of the C-tater (1), the amount of coating (2) on the actual object to be coated 14) can be controlled.

Thus, in the present invention, a circulation bomb for delivering paint to the heater head, a flow meter for measuring the flow rate of paint, and a measured value of the flow meter are preset. A comparator is used to compare the flow rate with the set value, and when the measured value is larger than the set value based on the comparison signal of the comparator, the rotational speed of the circulating 117P pump is decreased and the measured value is smaller than the set value. -9
Since it is equipped with a control unit that increases the rotation speed of
For example, even if the flow rate decreases below the preset flow rate due to resistance in the connecting pipe or a clogged filter, the flow meter detects the decrease in flow rate, the comparison unit sends out a comparison signal, and the control unit outputs a signal. By increasing the number of rotations, the flow rate increases, and the flow rate of the paint delivered to the flow coater head remains approximately constant, so not only can the flow rate be adjusted without the need for manual labor as in the past, but the flow rate can also be increased. Adjustment accuracy is also included,
A stable coating scene is always obtained, and by increasing the precision of the flow rate needle and control unit, it is possible to control the coating flow rate more delicately, improving the work efficiency of the circulation pump.

[Brief explanation of the drawing]

FIG.
(1) is Tanabata, (2) is the circulation pump, (3) is the flow coater head, 14) is the object to be coated, (6) is the flow meter, (
6) is a comparison section, and ()) is a control section. Agent Patent Attorney Ishi 1) Choshichi

Claims (1)

[Claims] (1) In a flow coater coating machine, in which paint is sent to the flow coater head by a circulation desk driven by an e-tater, and KIk1% of the object being coated is coated below the flow coater head. A flow rate needle is provided to measure the flow rate of paint sent from the circulation pump to the flow coater head, and a comparison section is provided to compare the measured value of the flow meter and a preset flow rate setting value and output a comparison signal. When this comparison signal is detected and the measured value is greater than the set value, the final rotational speed of the circulation pump is decreased, and when the measured value is smaller than the set value, the final rotational speed of the circulation pump is increased and the flow is started. We installed a control unit that keeps the flow rate of paint sent to the coater at a nearly constant rate! ! ! ! A unique flow coater head.