JP2862710B2 - Coating equipment for tubular parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus suitable for applying a coating to a limited part of a cylindrical part, particularly when the object to be coated is a cylindrical part.

[0002]

2. Description of the Related Art In coating technology, various paints are applied to the surface of an object by an appropriate method and dried or cured to prevent corrosion, decay and aging of the object by a film formed on the surface of the object.
In addition, various properties such as water resistance, heat resistance, and chemical resistance are imparted, and the finished surface has an aesthetic appearance. In the case of painting, the painting method is designed according to the material and shape of the object to be painted, the painting site, the size of the lot, the characteristics of the paint to be used, and the like. Conventional coating equipment is not limited to the relatively simple brush method and spray method, for example,
There are a flow coater system that automatically coats objects to be coated on a conveyor, a centrifugal coating system that is applied when painting the inside of large steel pipes, etc., and there are known improved tools and devices for each system. . By the way, the object to be coated may be a small cylindrical part such as a mechanical part, and the coating may be required on a limited portion of the cylindrical part. In such a case, a brush method or a spray method is usually adopted.However, apply a dip coating method to mask the part except for the part to be painted, and immerse the cylindrical part in a coating tank containing paint. There is also.

[0003]

However, the conventional brush system is suitable for a small lot, but when it is a large lot, both workability and quality are easily impaired. In the spray method, stable quality cannot be obtained when the object to be coated is small, and it is difficult to adopt the method when a film is to be formed on a part of the inner or outer periphery of a cylindrical part. Furthermore, in both cases, the quality greatly depends on the experience and ability of the operator. On the other hand, in the conventional immersion method, when forming a film on the entire cylindrical part in a large lot, it can often be satisfied in terms of workability and quality, but
When it is desired to form a film on a limited portion of the cylindrical part, a masking step is required. In particular, when a film is to be formed on a part of the inner periphery, workability is extremely deteriorated.

Accordingly, the present invention is directed to a method for forming a film only on a relatively small cylindrical part and on the outer or inner periphery of the cylindrical part, or on a limited portion of the outer or inner periphery. It is an object of the present invention to provide a coating apparatus which has good workability and can obtain stable quality.

[0005]

Tubular component coating system of the present invention in order to achieve the above object In order to achieve the above, the tubular part liquid coating
To a limited area of the cylindrical part
In the mounting device, a sealed container for containing the liquid paint,
A cylindrical holding member for communicating the container inside and outside is secured to the upper wall of the closed container, and inserted into the inside or outside of the holding member
And the tubular part, a mounting means for freely supporting detachably the Jodaka position of the holding member, the paint contained in the closed container
The liquid level of the paint entering the holding member by displacing the liquid level
Liquid level adjusting means for adjusting the height, and a liquid level detecting means capable of detecting the liquid level of the paint that has risen in the holding member,
The cylindrical component is attached to the closed container with the holding member and the mounting member.
Chakushudan while supporting through, by raising through the holding member by the liquid level adjusting means paints the closed vessel, and the gist that the tubular part to the partial immersion state.

[0006]

[Function] In the coating apparatus having the above configuration, a closed container is used.
Since a mounting means including a cylindrical holding member communicating with the inside and outside of the container is provided, it is possible to raise the paint in the closed container through the holding member by relatively simple liquid level adjusting means, The cylindrical part supported inside or outside is partially immersed in the raised paint and applied to a limited area. In this case, the liquid level detecting means detects, for example, the liquid level of the paint that has risen in the holding member, and detects that the coating part of the tubular part has been partially immersed as designed. Based on this detection result, the operation of the liquid level adjusting means is controlled so that the immersion state is maintained, or the paint is lowered to the same original liquid level state when the design immersion time has elapsed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The best embodiment of the present invention will now be described with reference to FIGS.
Each drawing schematically shows a coating apparatus according to a different embodiment of the present invention. The coating apparatus shown in FIG. 1 includes a closed container 1 containing a liquid coating material A, a mounting means 3 having a cylindrical holding member 2 and supporting a tubular component B1 as an object to be coated, Liquid level adjusting means 4 for raising the coating material A through the holding member 2, a liquid level detecting means 5 for detecting the liquid level of the coating material A, and interposed between the liquid level adjusting means 4 and the liquid level detecting means 5. And a stirring circuit 7.

The closed container 1 is provided with a lid 9
Is mounted so as to be sealable. A pipe 10 is connected to the lower part of the container body 8 via a valve 11, and the paint A used in the container is supplied through the pipe 10 and discharged from the container A as necessary. The lid 9 has a plurality of holes, and the holding member 2
The liquid level adjusting means 4, the liquid level detecting means 5, and the stirring means 7 are provided. The holding member 2 is a pipe, and is held substantially vertically by penetrating through a hole in the lid 9. The inner peripheral part of the holding member 2 has a slightly larger diameter from the upper part to the middle part, and forms a step part 2a between the inner part and the lower part. The large-diameter portion is formed to have such a size that the tubular component B1 can be removably inserted without any gap, and when the tubular component B1 is inserted and set, the step 2a serves as a stopper surface. Although the drawing shows a single holding member 2, a plurality of holding members 2 are actually provided on the lid 9. The liquid level detecting means 5 includes a pipe 12 installed in the hole in the same manner as the holding member 2, and a photoelectric sensor 13 provided directly above the pipe 12. The photoelectric sensor 13 includes, for example, a light emitting processing unit and a light receiving processing unit incorporated in a case.
The signal of each processing unit is calculated to calculate the liquid level of the paint A that has risen in the pipe 12, and a signal is transmitted to the control circuit 6 when the liquid level reaches the set liquid level. In this case, pipe 12
A float 14 for sensing is floated on the paint A inside.
The control circuit unit 6 receives the signal from the photoelectric sensor 13 when the liquid level of the coating material A that has risen in the pipe 12 rises to a set value, and for example, switches the operation of the liquid level adjusting unit 4. This is a relay circuit for transmitting a signal or switching the operation of the liquid level adjusting means 4 when a set immersion coating time has elapsed.

The liquid level adjusting means 4 raises or lowers the coating material A in the holding member 2 by a predetermined height. Here, air is supplied from the pump 16 into the closed container 1 via the electromagnetic valve 15. The method of raising and lowering the paint A by the air pressure is adopted. Solenoid valve 15, a suction port 15a connected to the pump 16, discharge ports 15 for introducing air into the sealed container 1
b, and a discharge port 15c for exhausting the air in the sealed container 1 and the air from the suction port 15a to the outside as necessary. The discharge port 15b is provided in the introduction portion 17 mounted in the hole of the lid 9. Connected. The solenoid valve 15 is connected to the control circuit 6 and switches the air supplied through the suction port 15a from the discharge port 15b to the discharge port 15c according to a signal from the control circuit 6, or changes the paint A in the holding member 2 according to the signal. When descending, a flow path is formed between the discharge port 15b and the discharge port 15c. The stirring means 7 is provided to keep the uniformity of the coating material A contained in the closed container 1, and is driven by a motor M using a propeller type here. The location and number of the stirring means 7 are designed in consideration of the size of the closed vessel 1 and the characteristics of the paint to be used. On the other hand, in the case of highly viscous paint, a turbine type is used. You. Although the pump 16 is used for supplying air, the pump 16 may be adapted to supply not only air but also an inert gas such as nitrogen.

Next, an example of use of the above-described apparatus of the present invention will be outlined. The mounting means 3 of this embodiment is applied to the case where the inner periphery of the tubular part B1 is painted. This inner periphery is not limited to the case where the entire periphery of the inner periphery is painted, but also includes the case where a portion from the lower end of the inner periphery to a predetermined position is partially painted. First, the cylindrical part B1 is set on the holding member 2 as the mounting means 3. At this time, the cylindrical component B1 has been subjected to a pretreatment such as degreasing and cleaning as necessary, and is set by being inserted into the holding member 2. The coating material A is supplied into the container through the pipe 10 in a predetermined amount in a state where the coating film forming element is dissolved in a solvent and made uniform. In the embodiment, the coating material A is accommodated up to the vicinity of the lower end of the cylindrical component B1 set as shown in the figure, and from this state, the liquid level adjusting means 4 is driven to raise the coating material A into the cylindrical component B1. .

When the pump 16 is driven, air is supplied to the solenoid valve 1.
5 and is fed into the closed container 1 through the discharge port 15b. Since the paint A is pressed downward while being pressurized in the closed container 1, the paint portion in the pipe 12 and the holding member 2 communicating with the outside air rises in accordance with the pressing force. The liquid level of the paint A to be raised is determined by the pipe 12 and the holding member 2.
And the paint A rising in the pipe 12 has a predetermined height, that is, a position where a coating is to be formed on the inner peripheral portion of the cylindrical part B1 (for example, the paint A rises to the upper end portion in the case of the entire inner peripheral portion). When it reaches the intermediate position, it means that it has risen from the lower end to the intermediate position.), The signal from the photoelectric sensor 13 causes the solenoid valve 1 to be controlled via the control circuit unit 6.
5. Send the switching signal to 5. Solenoid valve 15 is suction port 15
The air supplied through a is switched from the discharge port 15b side to the discharge port 15c side to keep the pressure in the closed container 1 constant. As a result, the coating material A has risen to the position where the coating is formed in the tubular component B1 and is in a partially immersed state. afterwards,
When the set immersion time has elapsed, the solenoid valve 15 is set in the discharge port 15 b side and the discharge port 15 b by a signal from the control circuit unit 6.
It operates to form a flow path with the c side, and discharges the compressed air in the closed container 1 to the outside. Then, the raised paint portion falls down inside the pipe 12 and the holding member 2 to have the same liquid level as before, and is located at the lower portion of the tubular part B1. After the set leaving time has elapsed, the tubular component B1 is detached from the holding member 2. By using the apparatus of the present invention, the coating material A is automatically applied to the inner peripheral portion of the tubular part B1, and a partial film can be formed. In this apparatus, since the cylindrical part B1 as an object to be coated is set by the mounting means 3 and can be brought into an accurate partial immersion state by the liquid level adjusting means 4 controlled by the liquid level detecting means 5, The product can be obtained accurately and efficiently as designed.

FIG. 2 shows a coating apparatus according to a second embodiment of the present invention. In this apparatus, the same parts as those in FIG. The second embodiment is an example in which the above-mentioned liquid level adjusting means 4 and liquid level detecting means 5 are changed, and shows an example of a mounting means in the case of forming a film on the outer peripheral portion of the cylindrical part B2. As in the first embodiment, the coating apparatus shown in FIG. 3 includes the closed container 1, the mounting means 23, the liquid level adjusting means 24, the liquid level detecting means 25, and the liquid level adjusting means 24 and the liquid level detecting means 25. It has a control circuit section 6 and a stirring means 7 interposed therebetween. Here, the mounting means 23 includes a substantially cylindrical holder 21 for supporting the cylindrical component B2 from below,
A cylindrical holding member 22 covers the upper side of the holding tool 21. The holder 21 is erected on the inner bottom wall of the container body 8. The upper end of the holder 21 is formed in a small-diameter engaging portion 21a, and forms a step 21b with the large-diameter portion. The engaging portion 21a is formed to have such a size that the tubular component B2 can be inserted in a detachable manner without any gap, and when the lower end of the tubular component B2 is engaged with the engaging portion 21a, the step portion 21b becomes a stopper surface. The liquid level detecting means 25 is located just above the pipe 12.
Is provided. The conductivity meter 20 is provided with electrodes 20a and 20b at predetermined positions in the pipe 12, and
Rises and comes into contact, a current flows to generate a signal, which is transmitted to the control circuit 6.

The liquid level adjusting means 24 applies the coating material A to the holding member 22.
To raise or lower the inside by a predetermined height,
Here, a paint reservoir 27 communicating with the paint A in the closed container 1 via a flexible hose 26 is used.
The method of hanging up and down 7 was adopted. This vertical movement is constituted by, for example, a support member 28 disposed adjacent to the closed container 1 and a winch 29 that can be wound up and wound by the motor M, as shown in the drawing, and the end of the rope 30 pulled out from the winch 29 is moved. The support member 28 was bypassed and connected to the paint reservoir 27. When the paint reservoir 27 is pulled up via the rope 30 by the drive of the motor M, the paint A in the paint reservoir 27 is supplied into the closed container 1 through the hose 26, and the paint portion in the holding member 22 and the pipe 12 is removed. Rise. Further, the motor M is connected to the control circuit unit 6. When the paint A rising in the pipe 12 reaches a predetermined height position, when the control circuit 6 receives a signal transmitted from the conductivity meter 20, the control circuit 6 transmits a signal to the motor M, and the signal is transmitted to the motor M. As a result, the motor M stops, the liquid level of the coating material A in the holding member 22 is kept constant, and a partial immersion state is set. Thereafter, when the set immersion time elapses, the motor M is operated to rotate in the reverse direction to move down the paint reservoir 27 by a signal from the control circuit section 6 and is controlled so that the detaching operation of the tubular part B2 can be performed. You.

In the second embodiment, in addition to the above effects,
By devising the mounting means 23, a partial film can be formed on the outer peripheral portion of the cylindrical component B2 from the entire surface or the lower portion to an arbitrary position. In addition, by providing the liquid level adjusting means 24 and the liquid level detecting means 25, the selection range is expanded when designing the closed container 1 in terms of size, economy, and the like. In addition, as another means for suspending and moving the paint reservoir 27 up and down as in this embodiment, a so-called rack-and-Pinyan system in which the rotation of the motor is changed to a linear motion can be applied.

FIG. 3 shows a coating apparatus according to a third embodiment of the present invention, and the same parts as those in FIG. 1 are denoted by the same reference numerals. The third embodiment is an example in which the above-mentioned liquid level adjusting means and liquid level detecting means are further changed.
3 shows an example of a mounting means in the case of forming a belt-like film on an inner peripheral intermediate portion of the above. The coating apparatus shown in the figure includes a closed container 1, a mounting means 33, and a liquid level adjusting means 34, as in the above embodiments.
A liquid level detecting means 35; a control circuit section 6 interposed between the liquid level adjusting means 34 and the liquid level detecting means 35; Here, the mounting means 33 is composed of a holding member 32 made of a pipe as in the first embodiment, but is held vertically in a hole of the lid 9 with its upper part slightly protruding. The cylindrical component B3 is removably inserted into the protruding portion of the holding member 32 without any gap, and when the lower end of the cylindrical component B3 is engaged with the cylindrical component B3, the outer wall of the lid 9 serves as a stopper surface. The liquid level detecting means 35 is provided with an ultrasonic sensor 43.
When the paint A rises to a predetermined height position in the pipe 12, this is sensed and a signal is generated, and this signal is transmitted to the control circuit 6.

As the liquid level adjusting means 34, a piston system is employed here. In this piston type, a cylinder 36 communicating the inside and outside of the container is provided in a hole of the lid 9, and a piston 37 disposed in the cylinder 36 is driven by a motor M
It is configured to move up and down by forward and reverse rotation of. Specifically, when the motor M is driven, the piston 37
Is moved downward, and the paint A in the cylinder 36 is extruded into the paint A in the closed container 1.
Since the volume of the paint A in the inside increases, the paint portion in the holding member 32 and the pipe 12 rises. Further, the motor M is connected to the control circuit 6, and when the paint A rising in the pipe 12 reaches a predetermined height position by a signal from the control circuit 6, the ultrasonic sensor 43 detects this and sends a signal. Send to
The control circuit section 6 sends a signal to the motor M, and the motor M is stopped by the signal to keep the liquid level of the coating material A in the holding member 32 constant, and a partial immersion state is set. Thereafter, when the set immersion time has elapsed, the motor M is rotated in the reverse direction by the signal from the control circuit unit 6 to move the piston 37 into the cylinder 3.
6 and is controlled so as to perform the detaching operation of the tubular part B3.

In the third embodiment, in addition to the above effects,
By devising the mounting means 33, it is possible to form a strip-shaped partial coating on the inner peripheral portion of the tubular component B3 from the lower side to an arbitrary position. Further, by providing the liquid level adjusting means 34 and the liquid level detecting means 35, the selection range can be further expanded when designing. Thus, the device of the present invention
The mounting means, the liquid level adjusting means, can be variously modified when embodying the respective constituent requirements of the liquid level detecting means, and also for the closed container, the shape of the cylindrical part as the object to be coated and the size of the lot, It can be further deformed or developed depending on the characteristics of the paint used.

[0018]

As described above, in the coating apparatus according to the present invention, the closed part is used, and the cylindrical part is formed by using the mounting means such as the cylindrical holding member communicating the inside and outside of the container. , It is possible to raise the paint in the closed container through the holding member or the like by relatively simple liquid level adjustment means, and to hold the cylindrical component supporting the inside or outside of the holding member on the holding member. It can be partially immersed in the paint that has risen through the inside and applied to a limited area.
Therefore, the present invention can omit the masking step in the case where it is desired to form a film only on a limited portion of the outer periphery or inner periphery of the cylindrical component, or the outer periphery or the inner periphery with respect to the conventional dip coating. In addition, a film can be formed with stable quality even in a large lot. As a result, the work efficiency and the quality of the formed film can be greatly improved particularly when the object to be coated is a relatively small cylindrical part and is in a large lot.

[Brief description of the drawings]

FIG. 1 is a schematic view of a coating apparatus shown as a first embodiment of the present invention.

FIG. 2 is a schematic view showing a second embodiment of the present invention.

FIG. 3 is a schematic view of a coating apparatus shown as a third embodiment of the present invention.

[Explanation of symbols]

1 Closed container 2, 22, 32
Holding member 3,23,33 Mounting means 4,24,34
Liquid level adjusting means 5, 25, 35 Liquid level detecting means A Paint B1, B2, B3 Cylindrical part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B05C 3/00-3/109 B05C 7/04

Claims (1)

(57) [Claims] 1. A cylindrical part is partially immersed in a liquid paint to form a cylindrical part.
In the coating apparatus for applying a limited portion of the component, a closed vessel containing said liquid coating, a cylindrical holding member for communicating a fixed in the vessel and out the top wall of the sealed container, the inside of the holding member Or the cylindrical part inserted outside
And a mounting means for freely supporting detachably the Jodaka position of the holding member, displaces the liquid surface of the paint contained in the closed container, wherein
Liquid level adjusting means for adjusting the liquid level of the paint contained in the holding member, and liquid level detecting means capable of detecting the liquid level of the paint raised in the holding member, Put the cylindrical part in the closed container
Wherein while supporting via the holding member and the mounting means, by raising through the holding member by the liquid level adjusting means paints the closed container, to the tubular part to partially immersed state against Coating equipment for cylindrical parts.