JP2000202338A - Coating material amount measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an accurate measured value by correcting an error even if the error is generated in the coating material feed flowmeter and a coating material return flowmeter of a coating material amt. measuring apparatus. SOLUTION: A coating material feed flowmeter 1A measuring the amt. of the coating material flowing through the coating material feed piping 3 for feeding the coating material fed from a coating material tank 8 to a coating gum 10 and a coating material return flowmeter 1B measuring the amt. of the coating material flowing through a coating material return piping 4 for returning the coating material not emitted from the coating gun 10 to the coating material tank 8 are provided. At a time of coating-OFF, flowmeter deviation is measured on the basis of the difference between the coating material amt. of the coating material feed flowmeter 1A and that of the coating material return flowmeter 1B. At a time of coating-OFF, the emitting amt. of the coating material is measured on the basis of the difference between the coating material amt. of the coating material feed flowmeter 1A and that of the coating material return flowmeter 1B to be corrected on the basis of the flowmeter deviation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint amount measuring device for measuring the paint amount (meaning the discharge amount and / or the use amount) of a paint used by a paint spraying facility.

[0002]

2. Description of the Related Art A conventional paint amount measuring apparatus is disclosed, for example, in Japanese Patent Application Laid-Open No. 10-128190 previously proposed by the same applicant. The paint amount measuring device disclosed in this publication discloses a paint flow meter that measures the paint amount of paint flowing through a paint going pipe that supplies paint sent from a paint tank to a paint gun, and paint that is not discharged by the paint gun. A paint return flow meter for measuring the paint amount of paint flowing through the paint return pipe returning to the paint tank, and a difference (A−) between the paint amount A of the paint return flow meter and the paint amount B of the paint return flow meter. In B), the discharge amount T (T = A−B) of the paint discharged from the coating gun is measured. Further, the used amount S of the paint used at the predetermined time t can be obtained by the following equation: S = _Δt T = _Δt (A−B) by integrating the discharge amount T.

[0003]

However, according to the above paint quantity measuring device, when an error occurs in the paint flow meter or paint return flow meter, the error is reflected in the paint discharge amount T and the use amount S. This has caused a problem that accurate measurement values cannot be obtained. In particular, when the usage amount S is measured, the error is also integrated, so that the reliability of the measured value is further reduced. In addition, a gear-type volume flow meter often used for a paint flow meter and a paint return flow meter is liable to cause a temporal error due to abrasion of a gear or the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the problem to be solved by the present invention is that even if an error occurs in the paint flow meter or paint return flow meter, It is an object of the present invention to provide a paint amount measuring device capable of obtaining an accurate measured value by correcting the error.

[0005]

According to the first aspect of the present invention, there is provided a paint supply pipe for supplying paint supplied from a paint tank to a paint gun, and a paint which is not discharged by the paint gun. A paint flow meter which is provided in a paint spraying facility having a paint return pipe returning to the tank and measures the paint quantity of paint flowing through the paint return pipe; and a paint which measures the paint quantity of paint flowing through the paint return pipe. A paint flow measuring device comprising a return flow meter, and a paint amount measuring device that measures a discharge amount of the paint discharged by the coating gun by a difference between a paint amount of the paint going flow meter and a paint amount of the paint return flow meter,
When the paint gun is off, the flow meter deviation is measured by the difference between the paint amount of the paint going flow meter and the paint amount of the paint return flow meter, and when the paint gun is on, the paint is discharged. This is a paint quantity measuring device that measures the quantity and corrects the discharge quantity by the flow meter deviation to calculate the corrected discharge quantity.

With this configuration, when the paint gun is off, the flow meter deviation is measured based on the difference between the paint quantity measured by the paint flow meter and the paint quantity measured by the paint return flow meter. At this time, if there is no error in the paint flow meter or paint return flow meter, the flow meter deviation is 0, and if there is an error, the flow meter deviation corresponding to the error is measured.

Since the paint is discharged from the paint gun when the paint gun is turned on, the paint quantity measured by the paint return flow meter is ejected from the paint gun as compared with the paint quantity measured by the paint going flow meter. It is reduced by the amount of paint applied. Here, the discharge amount of the paint is measured based on the difference between the paint amount measured by the paint return flow meter and the paint amount measured by the paint return flow meter. Further, the measured paint discharge amount is corrected by the flow meter deviation to calculate a corrected discharge amount. That is, if there is no error in the paint flow meter or the paint return flow meter, the flow meter deviation is 0, and therefore, the paint discharge amount becomes the corrected discharge amount as it is. Also, if there is an error in the paint flow meter or paint return flow meter, an accurate corrected discharge amount can be obtained by correcting the paint discharge amount based on the flow meter deviation measured when the paint is off. Can be

According to a second aspect of the present invention, when the coating of the paint gun is turned off, each hour, a difference between an integrated paint amount obtained by integrating the paint amount of the paint going flowmeter and an integrated paint amount obtained by integrating the paint amount of the paint return flow meter is obtained. The flow meter average deviation is measured beforehand, and when the coating gun is on, the discharge amount of the paint is measured, and the discharge amount is corrected and integrated by the flow meter average deviation to calculate the usage amount for a predetermined time. The paint amount measuring device according to claim 1.

With this configuration, when the paint gun is turned off, the integrated paint amount obtained by integrating the paint amount measured by the paint flow meter and the integrated paint amount obtained by integrating the paint amount measured by the paint return flow meter are used. The hourly average deviation of the flow meter is measured based on the difference. This is, for example, when measuring the usage amount for a predetermined time by integrating the discharge amount of the paint, if there is a pump pulsation of the paint supply pump, the flow meter deviation fluctuates, so the pump pulsation is considered This is because the error is reduced by averaging the flow meter deviation.

When the paint gun is turned on, the paint discharge amount is measured based on the difference between the paint amount measured by the paint flow meter and the paint amount measured by the paint return flow meter. Further, the measured paint discharge amount is corrected and integrated by the flow meter average deviation to calculate the amount of use for a predetermined time.
In other words, by correcting and integrating the discharge amount of paint with the flowmeter average deviation measured when the paint is off,
Even if there is a pump pulsation of the paint supply pump, it is possible to accurately measure the usage amount for a predetermined time.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment will be described with reference to FIG. FIG. 1 schematically shows a paint spraying facility. After giving an overview of the paint spraying equipment, the paint measuring device will be described in detail. The paint spraying equipment is a coating machine 15
Is mainly composed. The coating machine 15 includes a coating gun 10 that discharges and sprays a coating material on an object (not shown),
A robot manipulator 6 which holds the coating gun 10 and is scanned by a driving device (not shown) while maintaining a constant distance between the object to be coated and the coating gun 10; and a color change valve 5 installed on the robot manipulator 6. And the coating gun 10 and the color change valve 5
Between the paint hose 13 and the paint hose 1
3 is provided with a paint on / off valve 9 disposed in the middle of 3. The coating machine 15 is controlled by the robot controller 11. The paint on / off signal from the robot controller 11 is input to the paint on / off valve 9.

Since the color change valve 5 is a well-known one, its detailed structure is not shown, but a plurality of paint inlets, a plurality of paint return ports, and a paint to which one end of the paint hose 13 is connected. An outlet, a working air inlet and a cleaning liquid inlet are provided. The color change valve 5 is configured to discharge and stop the paint, the cleaning liquid, and the air of the selected color to the paint hose 13 in response to the supply of the working air.

The paint spraying equipment includes a plurality of paint tanks 8 for storing paints of respective colors, and a plurality of paint supply pumps 7 for supplying paints of respective colors from the paint tanks 8 to the color change valve 5. And a plurality of paint return pipes 4 for returning paint of each color from the color change valve 5 to the paint tank 8.
And In FIG. 1, the paint tank 8, the paint supply pump 7, the paint going pipe 3, and the paint returning pipe 4 are shown only for one color among the plurality of colors, and other colors are used. Those for paint are omitted.

The paint pipes 3 are connected to paint inlets of the color change valve 5, respectively. The paint return pipes 4 are connected to paint return ports of the color change valve 5, respectively.
Of the paint supplied to the color change valve 5 through the paint pipe 3, the remaining paint that has not flowed out to the paint hose 13 passes through the paint return pipe 4 to the paint tank 8.
Is returned to.

The above-mentioned paint spraying equipment is provided with a paint amount measuring device for each color, which will be described in detail below, for measuring the paint amount of the used paint. Since the paint amount measuring devices for each color have almost the same configuration, only one of them will be described, and the other will not be described.

The paint quantity measuring device includes a paint flow meter 1A provided in the middle of the paint pipe 3, a paint return flow meter 1B provided in the paint return pipe 4, and the paint flow meter. An arithmetic unit 20 to which the outputs of the flow meter 1A and the paint return flow meter 1B are input, and a flow display unit 2 for displaying the flow rate calculated by the arithmetic unit 20 are provided. The paint on / off signal input from the robot controller 11 to the paint on / off valve 9 is also input to the arithmetic unit 20.

The paint flow meter 1A measures the paint quantity of the paint flowing from the paint tank 8 through the paint pipe 3 to the color change valve 5. Also,
The paint return flow meter 1 </ b> B measures the paint amount of the paint flowing from the color change valve 5 to the paint tank 8 through the paint return pipe.

When there is no painting on / off signal from the robot controller 11, that is, when the painting of the painting gun 10 is off, the arithmetic unit 20 outputs the paint going flow meter 1A.
From the output value (so-called measured paint amount) A ₀ , the output value of the paint return flow meter 1B (so-called measured paint amount)
B ₀ is subtracted, and the flow meter deviation ΔC (ΔC = A ₀ −B ₀ ) is measured based on the difference (A ₀ −B ₀ ). At this time, if there is no error in the paint flow meter 1A or the paint return flow meter 1B, the flow meter deviation ΔC is 0. If there is an error, the flow meter deviation ΔC corresponding to the error is measured.

When there is a paint on / off signal from the robot controller 11, that is, when the paint gun 10 is on, paint is discharged from the paint gun 10, so that the paint quantity measured by the paint flow meter 1A is reduced. In comparison, the paint amount measured by the paint return flow meter 1B is different from the paint gun 10
From the amount of paint ejected from the nozzle. When the coating is on, the arithmetic unit 20 sets the flow meter 1 for the paint.
From the output value A of A, the output value B of the paint return flow meter 1B
And the difference (A−B) is used to calculate the paint discharge amount T.
(T = AB) is measured. Further, the measured paint discharge amount T is corrected based on the flow meter deviation ΔC to calculate a corrected discharge amount T ₁ (T ₁ = T−ΔC = AB−ΔC). That is, the paint flow meter 1A or the paint return flow meter 1B
If there is no error in the flow rate, since the flowmeter deviation ΔC is 0,
Ejection amount T of paint as the correction ejection amount T _1. If there is an error in the paint flow meter 1A or the paint return flow meter 1B, the paint discharge amount T is corrected by the flow meter deviation ΔC measured when the paint is off, so that accurate correction can be made. ejection amount T ₁ is obtained.

Further, the arithmetic unit 20 measures the average deviation ΔD of the flowmeter every hour during the time when there is no painting on / off signal from the robot control device 11, that is, during the painting off time m. Measuring the flow meter average deviation ΔD means that, for example, in the case where the paint discharge amount T is integrated and the used amount S used during a predetermined time t is measured, there is a pump pulsation of the paint supply pump 7 or the like Flowmeter deviation ΔC
This is to reduce the error by averaging the flow meter deviation ΔC in consideration of the pump pulsation.

The average deviation ΔD of the flow meter is an integrated paint amount _Δt A obtained by integrating the output value A ₀ of the flow meter 1A for paint.
_0, is determined by dividing the difference _{(∫ t A 0 -∫ t B} 0) between the integrated coating amount ∫ _t B ₀ of the output values B ₀ and integration of the paint return flow meter 1B painting off time m . That is, the flow meter mean deviation [Delta] D is obtained by _{ΔD = (∫ t A 0 -∫} t B 0) / m.

When the coating of the coating gun 10 is on,
The amount S used during a certain time, ie, the painting on time t, from the painting on / off signal from the robot controller 11 is measured. Note that the time t is not limited to the painting-on time, and may be a fixed time of the painting-on time.

The used amount S of the paint is determined by the paint flow meter 1 described above.
From the output value A of A, the output value B of the paint return flow meter 1B
And the difference (A−B) is used to calculate the paint discharge amount T.
(T = AB), and the measured paint discharge amount T
Is corrected by the flowmeter average deviation ΔD to obtain a corrected discharge amount T.
₂ (T ₂ = T−ΔD = AB−ΔD) and is obtained by integrating. That is, the amount of paint used S
Is calculated by _{S = ∫ t T 2 = ∫} t (A-B-ΔD).

As described above, by correcting and integrating the discharge amount T of the paint based on the flow meter average deviation ΔD measured when the paint is off, even if there is a pump pulsation of the paint supply pump 7, etc. It is possible to accurately measure the usage amount S of the coating ON time t.

The painting machine 15 in the above-mentioned paint spraying equipment is provided in a painting booth. Also,
Although the paint flow meter 1A and the paint return flow meter 1B are provided inside the coating booth, they can be provided outside the coating booth. Further, the paint tank 8, the paint supply pump 7, the robot control device 11, the arithmetic device 20, and the like are disposed outside the painting booth.

The present invention is not limited to the above embodiment, but can be modified without departing from the scope of the present invention. For example, in the above-described embodiment, the paint amount measuring device that measures the paint amount in the paint spraying equipment that can paint a plurality of colors with the color change valve 5 has been illustrated. The same can be applied to those for measuring the amount of paint in equipment as described above. Further, the above-mentioned coating amount measuring apparatus can accurately measure the amount of the paint ejected from the coating gun 10 even when the worker holds the coating gun 10 by hand and performs hand spray painting. It is possible.

[0027]

According to the paint quantity measuring device of the present invention, even if an error occurs in the paint flow meter or paint return flow meter, an accurate measured value can be obtained by correcting the error. .

[Brief description of the drawings]

FIG. 1 is an explanatory diagram schematically showing a paint spraying facility according to one embodiment.

[Explanation of symbols]

 1A Flow meter for paint 1B Paint flow meter 3 Paint return pipe 4 Paint return pipe 8 Paint tank 10 Paint gun

Claims (2)

[Claims] 1. A paint spraying facility provided with a paint going pipe for supplying paint sent from a paint tank to a paint gun, and a paint return pipe for returning paint not discharged by the paint gun to the paint tank. A paint flow meter for measuring the amount of paint flowing through the paint return pipe, and a paint return flow meter for measuring the paint quantity of paint flowing through the paint return pipe; A paint amount measuring device that measures a discharge amount of paint discharged by the coating gun based on a difference between the paint amount of the paint return flow meter and a paint amount of the paint going flow meter when coating of the coating gun is off. The flow meter deviation is measured based on the difference from the paint amount of the paint return flow meter, and when the coating gun is turned on, the discharge amount of the paint is measured and the discharge amount is compensated for by the flow meter deviation. A paint amount measuring device that calculates the corrected discharge amount by correcting it. 2. When the coating gun is off, the average deviation of the flow meter per hour is determined by the difference between the total paint amount obtained by integrating the paint amount of the paint flow meter and the cumulative paint amount obtained by integrating the paint amount of the paint return flow meter. 2. The method according to claim 1, wherein when the coating of the coating gun is turned on, the discharge amount of the paint is measured, and the discharge amount is corrected and integrated by the average deviation of the flow meter to calculate the usage amount for a predetermined time. Paint quantity measuring device.