JPH01249164A - Liquid coater for inside surface of hollow parts - Google Patents

Abstract

PURPOSE:To execute the automatic execution of operations for uniformly coating a liquid at a required thickness on the side surface of hollow parts by flushing the liquid into the hollow parts while horizontally holding the hollow parts under rotation to stick the liquid to the inside surface of said parts and uniformly leveling off the liquid sticking thereto. CONSTITUTION:The hollow parts X are held horizontally by a supporting part 2 and a retaining pad 11 and the inside surface of the hollow parts is cleaned by a rotating brush 18 in a cleaning stage A. The hollow parts X are held horizontally while the parts are rotated by a supporting roller, 3 and a press roller 13 and the liquid is flushed into the hollow parts X from a liquid supply pipe 26 to stick the liquid to the inside surface of the hollow parts X in a liquid coating stage B. The hollow parts are held horizontally by the supporting part 2 and the retaining pad 11 and the rotating brush 18 is inserted into the hollow parts to automatically and uniformly remove the excess component of the liquid in the subsequent leveling off stage C. As a result, the operations for coating the liquid uniformly at the required thickness on the inside surface of the hollow parts is automatically executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] <Industrial Application Fields> The present invention relates to a coating device for applying a liquid to the inner surface of a hollow part.

(Prior Art) Recently, in order to impart wear resistance and corrosion resistance to metal parts, a surface layer containing chromium oxide as a main component has been formed on the surface of the parts. This surface layer is mainly composed of chromium oxide converted from a chromium compound by heating on the surface of a component mainly made of iron, and has a reaction area between the component and the chromium oxide at the boundary with the component. By repeating multiple cycles of applying a liquid containing chromium oxide as the main component to the surface of metal parts, and then baking the applied liquid at a temperature of 500 to 600°C to form a surface layer containing chromium oxide as the main component, It is formed as a thick ceramic coating layer.

Formation of this surface layer is also being applied to metal hollow parts used for applications requiring properties such as wear resistance. For example, the cylinder (hollow part) of a pump that sends liquid in air conditioning equipment uses a stainless steel vibrator, and a piston is disposed inside this cylinder and continuously slides. For this reason, if a surface layer containing chromium oxide as a main component is formed on the inner surface of this pump cylinder, it can be provided with excellent M friction properties that can withstand intense sliding of the piston.

In order to form a surface layer on the inner surface of such a hollow component, it is necessary to apply a liquid containing the main component to the inner surface of the component.

Conventionally, in order to apply chromium oxide liquid to the inner surface of hollow parts, it was difficult to put a brush inside the hollow part and apply the liquid, so tape was generally applied to the outer peripheral surface of the hollow part. A method in which a worker holds a hollow part and immerses it in the liquid in a liquid tank while making sure that the liquid does not adhere to the part, and then the imitation worker pulls up the part and applies the liquid to the inner surface of the part. was being carried out. In addition, in order to smooth out the liquid and remove the excess after applying the liquid to the hollow parts,
The worker held the part in his hand and allowed the excess liquid to drip out, and then placed paper inside the part to remove the excess liquid.

(Problem to be solved by the invention) However, when manually immersing a hollow part in a liquid and applying the liquid to its inner surface, it is difficult to control the thickness of the liquid applied within a certain range. It is. In addition, it is not only very troublesome to manually level the liquid applied to the inner surface of the hollow part and remove the excess after applying the liquid, but it is also difficult to maintain a uniform coating thickness. It is often uneven. If the thickness of the liquid applied is uneven in this way, the thickness of the surface layer that is ultimately formed on the inner surface of the hollow part will be uneven, leading to the problem of variations in properties such as wear resistance. .

The present invention has been made based on the above-mentioned circumstances, and provides a liquid coating device that can easily apply a liquid to the inner surface of a hollow part at a constant thickness and easily level the liquid after rough coating. The purpose is to provide.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, a liquid coating device for the inner surface of a hollow part of the present invention is an apparatus for applying a liquid to the inner surface of a hollow part, A cleaning stage holds the hollow part horizontally and cleans the inner surface of the hollow part, and a liquid application stage holds the hollow part horizontally while rotating and pours a liquid into the hollow part to adhere the liquid to the inner surface of the hollow part. The present invention is characterized by comprising a liquid leveling stage for leveling the liquid adhered to the inner surface of the hollow part and removing an excess portion of the liquid.

(Function) In the cleaning stage, for example, a rotating brush is inserted into the inside of the hollow part to automatically and reliably clean the inner surface, and then in the liquid application stage, the liquid is poured into the rotating hollow part to ensure self-help and uniformity. The liquid can be applied to the inner surface of the hollow part, and the excess liquid can be removed automatically and uniformly by inserting, for example, a rotating brush into the interior of the hollow part at a liquid leveling stage.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

1 to 5 show a liquid coating device of the present invention. In the figure, reference numeral 1.1 denotes a pair of fixed support plates, which are arranged and fixed to face each other in parallel along the horizontal direction. Each fixed support plate 1.1
Holding portions for holding the hollow parts X are provided at intervals in the longitudinal direction, corresponding to the cleaning stage A, the liquid application stage B, the liquid leveling stage C, and the homogenization stage D, respectively.

That is, the cleaning stage A is placed on the upper side of the fixed support plate 1.1.
Support portions 2.2 are cut out at positions corresponding to the one-liquid leveling stage C and uniformization stage D, and an O-ra support is formed in the cutout portion formed at a position corresponding to the liquid application stage B. A support roller 3 rotatably supported on the support portion 4 is provided, and each support portion 2 and the support roller 3 are lined up at the same height. A pair of movable support plates 5.5 are provided in the inner space between the pair of fixed support plates 1.1 in parallel with the fixed support plates 1.1, and these movable support plates 5.5
The upper side of each fixed support plate 1.1 has three supporting parts 2.2.
and support portions 6.6 at positions corresponding to the support rollers 3, respectively.
is notched. This movable support plate 5.5 is a movable plate 7
The movable plate 7 is horizontally movable, and the movable plate 7 is raised and lowered by a vertically moving cylinder 8 using, for example, an air cylinder. The movable plate 7 is also provided with a horizontally moving cylinder 9, for example an air cylinder, which is connected to the movable support plate 5.5. This allows the movable support plate 5.5 to move vertically and horizontally. Figure 1 shows the movable support plate 5.5 lowered below the solid support plate 1.1, and Figure 2 shows the movable support plate 5.5 raised above the solid support plate 1.1. This shows the status.

Further, above the pair of fixed support plates 1.1, structures are provided at positions corresponding to the stages A to D to press down the hollow parts X supported by the fixed support plates 1.1 from above. At each location of the cleaning stage A, the liquid leveling stage C, and the homogenizing stage D, a vertically movable cylinder made of, for example, an air cylinder is installed above the support part 2.2 formed on the fixed support plate 1.1. 10 and a presser butt 11 attached to the cylinder 10 are provided, respectively. FIG. 4 is a sectional view showing the cleaning stage A as an example.

In addition, at each location that becomes the liquid application stage B, a vertically movable cylinder 12 consisting of, for example, an air cylinder and a vertically movable cylinder 12 located above the support part 2.2 formed on the fixed support plate 1.1 and attached to this cylinder 12 are provided. A presser roller 13 is provided, and this presser roller 13 is driven by an electric motor 14 to press the belt 1.
5. FIG. 5 is a sectional view showing the liquid application stage B. FIG.

Furthermore, on the side of one of the fixed support plates 5, structures are provided at positions corresponding to each stage A-D for processing the hollow parts X supported on the fixed support plate 1.1. . FIG. 3 is a plan view showing each stage. At each location corresponding to the cleaning stage A1, the liquid leveling stage C, and the homogenizing stage D, there is a movable rotation shaft 16 located on the same axis as the hollow part A supported by the support part 2.2 of the fixed support plate 1.
is supported by a bearing 17 so as to be rotatable and movable in the axial direction (direction of approaching or moving away from the hollow part A). A cylindrical brush 18 is attached to the tip of the movable rotating wheel 16, and a rotating shaft 20 is connected to the rear end via a spline joint 19.

The rotating shaft 20 is rotatably supported by a bearing 21, and the electric motor 2
2 via a belt 23. Further, the moving rotation shaft 16 is moved along the axial direction by the horizontal moving cylinder 25 via the first arm 24). FIG. 4 shows cleaning stage A as an example. A liquid supply pipe 26 is provided at a location corresponding to the liquid application stage B, facing the end of the hollow part X supported by the support part 2 of the fixed support plate 1.
It is connected to a liquid tank 28 via a pump 27.

Note that these described structures are attached to eight aircraft bodies (not shown).

The operation of the liquid coating device configured as described above will be explained below.

This device continuously moves a large number of hollow parts X while sequentially passing through stages A to D. first,
The hollow part X is transported by a transport device (not shown),
Support part 2. of cleaning stage A on solid support plate 1.1.
Place it horizontally on 2. At this point, the movable plate 7 is lowered by the operation of the vertically moving cylinder 8, and the movable support plate 5.5 is stopped at a position lower than the upper edge of the fixed support plate 1.1. Here, the vertical movement cylinder 10 of the cleaning stage A is operated to lower the presser butt 11 and the hollow part
Press it against the top surface. Thereby, the hollow part X is fixed between the support part 2.2 of the fixed support plate 1.1 and the push butt 11. Then, the electric motor 22 in the cleaning stage A is rotationally driven to rotate the rotating shaft 20, and this rotation is transmitted to the movable rotating wheel 16 via the spline shaft joint 19, and
The horizontal movement cylinder 25 is operated to move the moving rotation shaft 16 throughout the body via the arm 24, and the brush 18 attached to the tip of the moving rotation wheel 16 is inserted into the hollow part X from one end. Due to the movement and rotation of the movable rotation shaft 16, the brush 18 moves inside the hollow part X while rotating and comes into sliding contact with the entire inner surface of the hollow part X, scraping off unnecessary deposits adhering to this inner surface. remove. Alternatively, unnecessary deposits adhering to the surface of the coating layer formed on the inner surface of the hollow part X are scraped off and removed. Thereafter, the horizontal movement cylinder 25 is operated to move the movable rotary wheel 16 backward and draw the brush 18 out of the hollow part X. Note that the scraped off deposits are discharged to the outside of the hollow part X by an appropriate method.

After cleaning the inner surface of the hollow part X in the cleaning stage A in this manner, the vertically moving cylinder 10 is operated to raise the push pad 11 and separate it from the hollow part X, thereby releasing the fixation of the hollow part X. The movable plate 7 is moved by operating the vertical movement cylinder 8.
is raised, and the movable support plate 5.5 provided on the movable plate 7 is moved upwardly to above the fixed support plate 1.1. Movable support plate 5
．． The support part 6.5 belonging to the cleaning stage A when the support part 6.5 rises.
6 lifts the hollow part X supported on the support part 2.2 of the fixed support plate 1.1 and removes it from the support part 2.2. Next, the horizontal movement cylinder 9 provided on the movable plate 7 is operated to move the movable support plate 5.5 horizontally forward by one pitch (one support interval) on the movable plate 7 toward the liquid application stage B. The support part 6 that was moved and supported the hollow part X is the fixed support plate 1.1
It stops moving when it is positioned above the support row 53.3 corresponding to the liquid application stage B. Therefore, the vertically moving cylinder 8 is operated to lower the movable support plate 5.5 via the movable plate 7. While the movable plate 5.5 is lowering, the support part 6.
The hollow part X supported at 6 rests on support rollers 3.3 provided on the fixed support plate 1.1 and is supported. In this way, the hollow part X is moved from the cleaning stage A to the liquid application stage B. Note that the movable support plate 5.5 is a horizontally moving cylinder 9.
to move it back to its original position.

Further, the vertical movement cylinder 12 of the liquid application stage B is operated to lower the presser roller 13 to press it into contact with the upper surface of the hollow part X supported by the support roller 3.3, and the electric R14 is rotationally driven to belt the The presser roller 13 is rotated via the roller 15.

As a result, the hollow part X is supported by each roller 3, 3.13 and rotates. Then, the water supply pump 27 is driven to send the liquid from the tank 28 to the liquid supply pipe 26, and from this liquid supply pipe 26, the liquid is sent into the interior through the opening at one end of the hollow part X. The sent liquid flows in the axial direction of the hollow component This liquid is supplied in an amount that allows the supply layer to adhere to the entire inner surface of the hollow part with a certain thickness. Note that the liquid flowing out from the hollow part X is recovered by an appropriate method. After the liquid has been applied to the inner surface of the hollow part X in this manner, the vertical movement cylinder 12 is operated to raise the presser roller 13 and separate it from the hollow part X.

Next, the movable support plate 5 is moved by the operation of the vertically moving cylinder 8.
．． 5 to remove the hollow part After moving forward in the horizontal direction, cylinder 8
The hollow part X is lowered and placed on the support part 2.2 of the fixed support plate 1. Note that the movable support plate 5.5 is moved horizontally backward to its original position by the operation of the cylinder 9. The rotating shaft 16 is moved forward to move the brush 18 to the hollow part
The rotating shaft 16 is inserted into the inside of the
By rotating the brush 18 through the brush 18, the liquid applied to the inner surface of the hollow part X is spread over the entire inner surface, and the excess liquid is removed. Thereby, the state of application of the liquid on the inner surface of the hollow part X is made uniform. After this work is completed, the movable support plate 5 is moved by the cylinder 8.9 as before.
5, the hollow part is moved from the support parts 2, 2 of the liquid leveling stage C to the support part 2, 2 of the finishing stage E, and rotated by the operation of the horizontal movement cylinder 25 and the electric motor 22 of the finishing stage E. By rotating the brush on the inner surface of the hollow part X via the shaft 16, the liquid applied to the inner surface of the hollow part X is made more uniform.

After completing the finishing stage D, the hollow part X is removed from the fixed support plate 1.1, and the series of operations is completed.

Such a liquid coating device of the present invention can be employed, for example, when applying a chromium oxide liquid to the inner surface of a hollow steel part in a method of forming a surface layer mainly composed of chromium oxide on the inner surface of the hollow steel part. Then it is effective. That is, the surface layer of chromium oxide is formed by repeating multiple cycles of applying and drying a chromium oxide solution, but by using the liquid coating device of the present invention, it is possible to apply the chromium oxide solution uniformly in each cycle. Finally, a surface layer with a uniform thickness can be formed.

It should be noted that the devices provided at each stage of the liquid coating device of the present invention are not limited to the configuration of the above-described embodiments, and can be implemented with various modifications.

[Effects of the Invention] As explained above, according to the liquid coating device for the inner surface of a hollow part of the present invention, it is possible to automatically apply the liquid to the inner surface of the hollow part uniformly to a required thickness. .

[Brief explanation of the drawing]

The drawings show an embodiment of the position of the device of the present invention, FIGS. 1 and 2 are cross-sectional views taken along the line A-A in FIG. 3, FIG. 3 is a plan view, and FIG. 4 is a cross-sectional view taken along line A-A in FIG. FIG. 5 is a cross-sectional view taken along the line v--v. DESCRIPTION OF SYMBOLS 1... Fixed support plate, 3... Support part, 5... Movable support plate, 8.9.10... Cylinder, 11... Presser butt, 13... Presser roller, 18...・Brush, 22
...Electric motor, 25...Cylinder, 26...Liquid supply pipe, A...Cleaning stage, B...Liquid application stage,
C... Breaking-in stage, D... Finishing stage. Applicant's agent Patent attorney Takeshi Suzue Industry 1 Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] This device applies a liquid to the inner surface of a hollow part, and includes a cleaning stage that holds the hollow part horizontally and cleans the inner surface of the hollow part, and a cleaning stage that holds the hollow part horizontally and rotates and cleans the inside of the hollow part. The method is characterized by comprising a liquid application stage for pouring a liquid to adhere the liquid to the inner surface of the hollow part, and a liquid leveling stage for turning the hollow part sideways and leveling out the liquid adhered to the inner surface. Liquid coating device for the inner surface of hollow parts.