JP3483082B2 - Spray port cleaning equipment for spray-type coating equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gun tip of a painting gun used for painting a vehicle body, that is, a spray port cleaning device of a spray type coating device.

[0002]

2. Description of the Related Art Conventionally, as a spray type coating apparatus, for example,
There are painting guns used for painting car bodies in automobile factories.

Such a coating gun is generally attached to a coating robot, and the robot operates according to a predetermined program to set a predetermined time for an unpainted vehicle body or parts on the line. It is configured to coat a predetermined part with.

After using the above coating gun for a predetermined time, if the tip of the gun (spraying port) is not thoroughly cleaned, the spraying condition will deteriorate during the next use, or if a different color must be coated, The used paint may be mixed.

Therefore, generally, the following two types of cleaning devices are used.

[0006] One is a type in which a thinner serving as a cleaning liquid is discharged from the coating gun itself which is a spray type coating device to clean the tip of the gun itself.

The other type is one in which a painting gun is housed in a washing box having a washing nozzle, and a thinner is jetted from the washing nozzle while the painting gun is rotated to wash the entire gun body. Is.

[0008]

However, among the above types, the former type is capable of sufficiently cleaning the inside of the gun because the cleaning liquid is discharged from the inside of the gun, but the outer peripheral portion of the gun tip of the portion to be cleaned is direct. Since it cannot be washed, the detergency is inferior and the used thinner cannot be reused, which is uneconomical.

On the other hand, in the latter type, although the thinner can be reused, the scattering rate is large, so the recovery rate is poor, and the thinner tank and the thinner jet pump are separately provided, and the cleaning is performed. Since it is necessary to move the device body from the installation location to the gun position to wash the painting gun,
There is a problem that the size of the entire apparatus becomes large and the installation place is limited.

It is an object of the present invention to provide a spray port cleaning device of a spray type coating device which can solve the above problems.

[0011]

In order to solve the above-mentioned problems, according to the present invention, the lower end of a cleaning liquid suction pipe having a cleaning liquid jet nozzle at its upper end is opened in a box for containing the cleaning liquid, and An ejector function part is provided in the middle of the cleaning liquid suction pipe, and the ejector function part forms an air flow path throttle part in the middle of the cleaning liquid suction pipe, and an air chamber is formed inside the air flow path restriction part. The air supply pipes are connected to each other via the chamber forming cylinder so that the cleaning liquid is sucked up by the ejector effect and the cleaning liquid is ejected from the cleaning liquid ejecting nozzle so that the spray port of the spray coating apparatus can be cleaned.

The present invention is also characterized by the following configurations.

[0013]

(A) A spray port support portion for inserting and supporting the spray port of the spray coating apparatus is provided on the upper part of the box body.

(B) A cleaning liquid recirculation flow path having an annular cross section is provided outside the cleaning liquid suction pipe.

(C) The spray port support portion is configured by providing a support plate having solvent resistance and flexibility with a spray port insertion opening having a tapered spray port receiving surface formed on the periphery thereof. The cleaning liquid jet nozzle was installed toward the insertion opening.

(D) An air blow air supply pipe for drying the spray port after cleaning is provided in the box body.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a spray port cleaning device of a spray type coating device according to the present invention will be described below.

In the present invention, the lower end of the cleaning liquid suction pipe having the cleaning liquid jet nozzle at the upper end is opened in the box for containing the cleaning liquid such as thinner, and the ejector function part is provided in the middle of the cleaning liquid suction pipe. The configuration is provided.

In addition, the ejector function section forms an air flow path throttle part in the middle of the cleaning liquid suction pipe, and an air chamber forming cylinder in which an air chamber is formed inside the air flow path throttle part. It is configured by connecting and connecting air supply pipes.

Therefore, when the air supplied from the air supply pipe through the air chamber passes through the air passage throttle portion, a negative pressure is generated in the cleaning liquid suction pipe, and the negative pressure sucks up the cleaning liquid in the box body. The cleaning liquid can be strongly ejected from the cleaning liquid ejection nozzle by the so-called ejector effect.

As the spray-type coating apparatus, a coating gun equipped in a coating robot used for vehicle body coating in an automobile factory or the like is used, and the gun tip serving as the spray port of the coating gun is the box body described above. It can be supported by the spray port support formed on the upper part.

That is, the spray port support portion is provided on the upper portion of the box body, and the support port is formed by forming a tapered spray port receiving surface on the periphery of a support plate having solvent resistance and flexibility. It is configured by providing a spray port insertion opening.

The cleaning liquid jet nozzle is positioned toward the spray port insertion opening, and the cleaning liquid from the cleaning liquid jet nozzle is strongly jetted to the gun tip through the spray port insertion opening, and the gun is sprayed. The tip can be reliably washed.

Moreover, since the tapered spray port receiving surface is formed at the periphery of the spray port insertion opening, the state where the opening and the gun tip are reliably sealed is maintained, and the spray port receiving surface faces the opening. The air and the cleaning liquid ejected as a result do not leak outside. The supporting plate having solvent resistance and flexibility is preferably made of rubber.

Further, since the cleaning liquid recirculation passage having an annular cross section is provided outside the cleaning liquid suction pipe, the cleaning liquid ejected from the cleaning liquid ejection nozzle is recirculated into the box body through the cleaning liquid recirculation passage. Re-contained, re-usable and extremely economical.

The coating robot equipped with the coating gun is driven by a predetermined program. In this program, after the coating is completed, the gun tip is controlled to be inserted into the spray opening. It is desirable to control the spraying time of the cleaning liquid in the spray port cleaning device, its timing, and the like. As a result, the painting work and the gun tip cleaning work can be performed in a continuous process.

Further, in the spray port cleaning apparatus according to the present invention, an air blow air supply pipe for drying the spray port after cleaning is provided in the box body, and dry air is supplied from the air supply pipe. In this way, the gun tip is dried after cleaning in a short time to improve the efficiency of cleaning work.

As described above, since the spray port cleaning device according to the present invention does not require a pump or the like for ejecting the cleaning liquid, it is inexpensive and can be made into a compact shape as a whole. It is easy to install on the side of, and has a strong cleaning power.

Further, the cleaning power can be adjusted by adjusting the diameter, the air ejection angle, the ejection pressure, the distance between the cleaning fluid ejection nozzle and the gun tip, etc., in the throttle portion of the cleaning fluid suction pipe. In terms of configuration, it is possible to cope with the type of paint and the allowable cleaning time.

[0031]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the present embodiment, the spray type coating device will be described as a coating gun.

As shown in FIGS. 1 and 2, the spray port cleaning apparatus A of the spray coating apparatus according to the present invention is provided at a substantially central position in the box body 1 formed so as to be able to store the cleaning liquid B such as thinner.
A cleaning liquid suction nozzle 2 (hereinafter referred to as a nozzle 21) is provided at the upper end, and a cleaning liquid suction pipe 2 (hereinafter referred to as a suction pipe 2) provided with an ejector function unit 3 in the middle is disposed vertically and the lower end is the cleaning liquid. It opens in B.

Further, one end of an air supply pipe 4 is communicatively connected to the ejector function section 3, and the other end of the air supply pipe 4 is an air supply device such as a compressor (not shown) provided outside the box body 1. It is connected to the device.

In the box body 1, the bottom wall 10 is formed in a funnel shape, and the lower box 12 provided with the drain valve 5 for discharging the used cleaning liquid, and the tip of the spray port of the spray coating apparatus, that is,
It is composed of an upper box 11 provided with a spray port support portion 6 for inserting and supporting the gun tip G1 of the coating gun G, and the upper box 11 and the lower box 12 are connected via a sealing material 13. 14 and 15 are the flanges provided on the upper and lower boxes 11 and 12, respectively.
Sealing material 13 is provided between 14 and 15. 18 is upper and lower box 1
1,12 fixing thumbscrews.

The spray port support portion 6 is formed in a cylindrical shape which is slightly smaller than the box body 1, is attached to the upper box 11 as a penetrating body and communicates with the upper and lower boxes 11 and 12. A supporting plate 61 having solvent resistance and flexibility is attached to the upper end opening by a fixing means 60 including a pressing plate 60a and bolts 60b (FIG. 2). Reference numeral 65 is a notch for inserting an air blow air supply pipe 7 described later into the cylinder.

In this embodiment, the support plate 61 is made of thinner rubber and has a thickness t of about 6 mm (FIG. 4).

Further, the support plate 61 has a tapered spray port receiving surface.
A spray port insertion opening 63 having a periphery 62 is provided, and the gun tip G1 can be held in the spray port insertion opening 63. Then, the nozzle 21 is moved toward the spray port insertion opening 63.
Is provided.

The drain valve 5 is connected to the drain port 10a formed on the bottom wall 10 and can be manually opened / closed by an opening / closing cock 51.

Furthermore, inside the box 1, the gun tip G1 after cleaning
An air blow air supply pipe 7 for drying the air is provided.

As shown in FIG. 2, the air-blowing air supply pipe 7 has its tips bifurcated so as to face each other, and air ejection nozzles 71 and 72 provided at both tips are provided at the spray port insertion opening 63. On the other hand, the base end of the ejector function unit 3 is connected to an air supply device such as a compressor (not shown) provided outside the box 1 in the same manner as the air supply pipe 4 connected to the ejector function unit 3 described above. There is.

Further, in FIGS. 1 and 2, reference numeral 8 is a cylindrical filter, and an upper portion of a filter support cylinder 80 concentrically provided with respect to the suction pipe 2 inside the spray port support portion 6. Installed on.

A cleaning liquid recirculation flow path R is formed between the filter support cylinder 80 and the suction pipe 2.

That is, the filter 8 is formed of a mesh body capable of capturing only the cleaning liquid B out of the air and the cleaning liquid B ejected from the nozzle 21, and the captured cleaning liquid B.
Recirculates into the box 1 through the cleaning liquid recirculation flow path R.

On the other hand, the air passes through the filter 8 and the upper box
The exhaust pipe 16 projecting from the side wall 11 is discharged to the outside of the system of the main cleaning device A. Reference numeral 81 denotes a ventilation hole formed in the filter support cylinder 80, which communicates with the exhaust cylinder 16.

As described above, in the present embodiment, most of the air ejected from the nozzle 21 together with the cleaning liquid B is discharged from the exhaust system 16 to the outside of the system, but a part of the air does not reach the pressure inside the box 1. The ejector function, which will be described later, is promoted by fulfilling the function of increasing.

Reference numeral 9 denotes a liquid level gauge attached to the side wall of the box body 1 so that the remaining amount of the cleaning liquid B stored in the box body 1 can be confirmed from the outside.

Here, the ejector function section 3 and the spray port support section 6 will be further described with reference to FIGS. 3 and 4.

As shown in FIG. 3, the ejector function unit 3
Forms a narrow-width annular air flow passage throttle portion 31 in the middle of the suction pipe 2 so that the air chamber 32 is communicated with the throttle portion 31.
It is connected to the air supply pipe 4 via.

That is, the suction pipe 2 is divided into upper and lower parts, and is vertically connected via the air chamber forming cylinder 33 having a cylindrical connecting function with a constant width d ₁ and d ₂ .

Further, a recess is provided in the inner peripheral wall of the air chamber forming cylinder 33, and the air chamber for communicating the recess with the air supply pipe 4 is provided.
32.

The air supply pipe 4 is attached to the air chamber forming cylinder 33.
One end of the air supply pipe 4 is communicatively connected, and the air supply pipe 4 and the intake pipe 2 are communicatively connected via the ejector function part 3.

The vertically divided intake pipe 2 and the air chamber forming cylinder 33 may be fixed to each other by welding or the like, and a male screw is formed at the end of each of the upper and lower intake pipes 2.
A female screw may be formed on the air chamber forming cylinder 33 and screwed.

With this configuration, when air is supplied to the suction pipe 2, the air flow restricting portion 31 causes a negative pressure in the lower suction pipe 2, and the cleaning liquid B is sucked from the suction pipe 2 and flows from the nozzle 21 together with the air. It is strongly ejected. The ejection amount of the cleaning liquid B can be controlled by appropriately setting the widths d ₁ and d ₂ .

By the way, the air flow passage throttle portion 31 is formed in the peripheral wall of the suction pipe 2 so as to have an upward slope, and the supplied air is jetted obliquely upward.

This is because in order to eject the cleaning liquid B from the nozzle 21 together with the air, it is necessary to consider the forming angle θ ₁ of the air passage restricting portion 31, and if the forming angle θ ₁ is 60 ° or more, It is known that the suction pipe 2 in FIG. 3 is in a negative pressure state below the ejector function portion 3.

In view of this, in this embodiment, the forming angle θ ₁ of the air passage restricting portion 31 is set to 60 ° in consideration of the ease of processing.

Further, in FIG. 3, in order to eject the air and the cleaning liquid B vertically upward from the nozzle 21, as the distance L from the air flow passage throttle portion 31 to the tip of the nozzle 21, D is the suction pipe 2 and Assuming the inner diameter of the nozzle 21, L = D × ta
n60 ° or more, experimentally L = 5 × D
Has been found to be preferred.

Further, in this embodiment, as shown in FIG.
The spraying port receiving surface 62 formed on the periphery of the spraying port insertion opening 63 has a taper angle θ ₂ of 45 °. When the gun tip G1 is inserted into the spraying port insertion opening 63, the cleaning liquid B and the air are strongly discharged from the nozzle 21. Even if the and are ejected, the spray port receiving surface 62 is strongly pressed against the outer periphery of the tip end surface of the gun tip G1, and the cleaning liquid B does not leak to the outside.

The preferable distance H between the nozzle 21 and the gun tip G1 will be described. As shown in FIG.
It is known that the cleaning liquid B ejected upward from the liquid spreads at the spread angle α, and the spread angle α is at least 15 ° or more.

Therefore, the outer periphery of the gun tip G1 and the spray port receiving surface
The tip of the gun must be
It is necessary to spray the cleaning liquid B over a wider area than the outer periphery of G1.

To this end, assuming that the inner diameter of the nozzle 21 is D and the diameter of the cleaning liquid B reaching the gun tip G1 is D ₁ , the distance H between the nozzle 21 and the gun tip G1 is H = (D ₁ − D) / 2
It has been experimentally found that tan15 °> D / 4 is required.

In this embodiment, the nozzle 21 has an inner diameter D of 21.6.
mm, the diameter D ₂ of the gun tip G1 is 40 mm, and the distance H between the nozzle 21 and the gun tip G1 is 80 mm. The cleaning liquid B at this time
When the gun reaches the gun tip G1, the diameter D ₁ is D ₁ = D ₂ +2
Represented by β (β is the tip of the gun tip G1 and the cleaning liquid B is the gun tip
It is the difference from the outer circumference of the spray surface when it reaches G1).

With the configuration described above, in the spray port cleaning device A according to the present embodiment, when air is supplied from the air supply pipe 4, a negative pressure is generated when the air passes through the air flow passage throttle portion 31. Then, the cleaning liquid B in the box 1 is sucked up by the negative pressure, and the cleaning liquid B is sprayed from the nozzle 21 into the spray port insertion opening.
The gun tip G1 held by 63 can be ejected strongly toward the gun tip G1 to reliably clean the gun tip G1.

Further, the cleaning liquid B is jetted due to the ejector effect of the ejector function unit 3 housed in the box body 1, and a separate pump or the like for jetting the cleaning liquid B is not required, so that the entire structure is obtained. Can be made compact.

Therefore, in a car factory or the like, it is possible to dispose the main spray port cleaning device A on the line side of the vehicle body coating process. For example, the coating installed on the coating robot (not shown) arranged on the line. When cleaning the gun tip G1 of the gun, set the predetermined program for driving the coating robot to insert the gun tip G1 into the spray port insertion opening 63 of the spray port cleaning device A after completion of coating. , The gun tip cleaning work can be performed in a single painting process following the painting work, and the painting efficiency is significantly improved.

Since the air blow pipe 7 for drying the gun tip G1 after cleaning is provided in the box body 1, the drying of the gun tip G1 is promoted and the cleaning work can be shortened. , Can perform efficient cleaning work.

The cleaning liquid B in the spray port cleaning device A
The spraying time, the air blowing time, the timing, and the like may be controlled during the programming.

In addition, the jetted cleaning liquid B can be reliably collected and can be recycled and reused, which is economically beneficial.

[0069]

The present invention is carried out in the form as described above, and has the following effects.

(1) The lower end of the cleaning liquid suction pipe provided with the cleaning liquid jet nozzle at the upper end is opened in the box for accommodating the cleaning liquid, and the ejector function part is provided in the middle of the cleaning liquid suction pipe. The functional part is
Since an air flow passage throttle portion is formed in the middle of the cleaning liquid suction pipe, an air supply pipe is connected to the air flow passage throttle portion through an air chamber forming cylinder having an air chamber formed therein. The cleaning liquid can be sucked up by the ejector effect, and the cleaning liquid can be sprayed from the cleaning liquid spraying nozzle to clean the spray port of the spray coating apparatus. Further, by changing the setting of the width of the air flow path throttle portion, the amount of the cleaning liquid jetted can be made variable.

Therefore, a pump or the like for separately ejecting the cleaning liquid is not required, so that the entire configuration can be made compact. For example, in an automobile factory or the like, this spray port cleaning device is provided on the line side of the vehicle body painting process. It is possible to dispose without interfering with other devices.

[0072]

(2) Further, since the spray port support portion for inserting and supporting the spray port of the spray coating device is provided on the upper part of the box body, the spray port tip of the spray coating device is provided at the spray port supporting part. It can be supported in a stable state.

(3) Further, since the cleaning liquid recirculation channel having an annular cross section is provided on the outside of the cleaning liquid suction pipe, the cleaning liquid ejected from the cleaning liquid ejecting nozzle can be recirculated into the box body to be contained again. It is economical because it can be reused.

(4) Further, the spray port support portion is configured by providing a plate material having solvent resistance and flexibility with a spray port insertion opening having a tapered spray port receiving surface formed at the periphery thereof. By disposing the cleaning liquid jet nozzle toward the spray port insertion opening, the spray port can be reliably cleaned by the cleaning liquid jetted as described above, and the cleaning liquid does not leak to the outside. Furthermore, such a cleaning liquid can be reliably recovered and reused through the reflux passage as described above.

(5) Further, by providing the air blow air supply pipe for drying the spray port after cleaning in the box body, it is possible to accelerate the drying of the spray port and shorten the cleaning work time. Cleaning work can be performed.

[Brief description of drawings]

FIG. 1 is an overall side view of a spray port cleaning device of a spray coating device according to the present invention.

FIG. 2 is a front view in which a part of the spray port cleaning device is omitted.

FIG. 3 is an explanatory diagram of an ejector function unit.

FIG. 4 is an explanatory diagram of a spray port support portion.

FIG. 5 is an explanatory diagram showing a cleaning liquid ejection nozzle and a spray port of a spray coating apparatus.

[Explanation of symbols]

A Spray port cleaning device for spray coating equipment B cleaning liquid G painting gun G1 gun tip R Washing liquid recirculation flow path 1 box 2 Cleaning liquid suction pipe 3 Ejector function section 4 Air supply pipe 6 Spray port support 7 Air blow pipe for air blow 21 Cleaning liquid jet nozzle 31 Air flow restrictor 32 air chamber 33 Air chamber forming cylinder 61 Support plate 62 Spray port receiving surface 63 Spray port insertion opening

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Teruo Miyamoto Greater Kamiyama, Miyata-cho, Kurate-gun, Fukuoka Prefecture No. 1 Hirayama, Toyota Motor Kyushu Co., Ltd. Tree character Hirayama No. 1 Toyota Motor Kyushu Co., Ltd. (72) Inventor Tomonori Okubo 1050 Oyamada, Takasu Town, Onomichi City, Hiroshima Prefecture Press Industry Co., Ltd. Onomichi Plant (72) Inventor Yusuke Harayama Takasu Town, Onomichi City, Hiroshima Prefecture 1050 Oyamada Press Industry Co., Ltd. Onomichi Plant (72) Inventor Yasunori Yoshinaga 1050 Oyamada Takasu Town, Onomichi City, Hiroshima Prefect Industry Co., Ltd. Onomichi Plant (56) Reference JP-A-7-284702 (JP , A) JP-A-7-47048 (JP, A) JP-A-6-296937 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B05B 15 / 00-15 / 12

Claims (5)

(57) [Claims] 1. A cleaning liquid suction pipe (2) having a cleaning liquid spouting nozzle (21) at its upper end has a lower end opened into a box (1) for accommodating the cleaning liquid (B), and said cleaning liquid suction pipe. (2) Ejector function part (3) in the middle
The ejector function part (3) is provided with a cleaning liquid suction pie
Form an air flow passage restrictor (31) in the middle of the
An air chamber (32) is formed inside the air flow restrictor (31).
Air supply pipe (4) through the formed air chamber forming cylinder (33)
A spray port cleaning device of a spray type coating device, which is configured by connecting and communicating with each other . 2. A spray of a spray type coating device is provided on the upper part of the box body (1).
The spray port cleaning device of the spray coating apparatus according to claim 1, further comprising a spray port support portion (6) which supports the spray port. 3. A cross-section ring is provided outside the cleaning liquid suction pipe (2).
The spray port cleaning device of the spray coating device according to claim 1 or 2, wherein a cleaning liquid recirculation flow path (R) is provided. 4. The spray port support (6) is made solvent resistant and flexible.
Supporting plate (61) with a taper, a tapered spray port receiving surface
A spray port insertion opening (63) having the periphery (62) is provided.
Cleaning solution toward the spray port insertion opening (63).
A jet nozzle (21) is provided, characterized in that
The spray port cleaning device of the spray coating device according to 2 or 3 . 5. The spray port after washing is dried in the box (1).
The air blow pipe (7) for air blow is installed
The spray port cleaning device of the spray coating device according to any one of claims 1 to 4 .