JPH0248061A - Conveyor type spin coater - Google Patents

Abstract

PURPOSE:To miniaturize the entire part of the device by providing a pedestal to be imposed with a material to be coated, an endless conveyor which is connected in series to the pedestal and transports the same, a means of driving the conveyor in a tact system, a mechanism for rotating the pedestal, guns for painting, a painting booth and a drying oven. CONSTITUTION:The material to be coated is imposed on the pedestal 12A in its position and is transported intermittently in an arrow direction. The material is locked in the position of the pedestal 12E by a pedestal rotating mechanism 18 and is rotated when the material comes to the position of said pedestal. The paint is ejected from the guns 21, 22 of an automatic painting machine 20 for static electricity. This paint flows successively into the painting booth 24. The rotation of the pedestal stops and the pedestal is unlocked when the painting is completed. The pedestal moves to the position 12F. An inlet door 30 of the drying oven 28 opens by sliding sideways and the pedestal stops at the position 12G in an air curtain 32, where the door 30 is closed to prevent the escape of the hot air from the oven 28. The material to be painted which is fed in the tact system in the oven 28 and ends the prescribed drying time passes the curtain 32 in the position 12p.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an apparatus for painting various mechanical parts, etc., and in particular applies electrostatic painting, spray painting, airless spray painting, etc. to coating objects having complicated shapes. This relates to a device that uses non-electrodeposition coating.

(Prior art) Among the above-mentioned non-electrodeposition coating methods, electrostatic coating has the highest coating efficiency, but when it comes to objects with complex shapes, a rotating device is used to reduce the coating by 1/2. Even with rotation or 1/4 rotation, a coating efficiency of only 80% could be obtained at most.

In the most common conveyor type, the object to be coated is hung with a hanger and is continuously fed while being painted with a paint gun.
The conveyor speed is determined by the length of the drying oven and the paint baking conditions, so the drying oven and conveyor will be long.
This had the disadvantage of requiring a large installation space. moreover,
Conventional devices have the following drawbacks:

In the method of transporting objects by hanging them on hangers, sloping sections called air isolation chambers are installed before and after the drying oven to raise the conveyor, and after passing through the drying oven, the conveyor is lowered. Basically, the entrance and exit of the drying oven is open, and a large amount of thermal energy is lost. In particular, since the conveyor is continuously moving, there are slits at the entrance and exit of the drying oven for passage of the conveyor and hanger, allowing heat to escape.

In the case of a hanging conveyor, if rust occurs, there is a risk that it will fall and adhere to the product (subject to be coated) before being heat cured. In addition, grease may fall from the conveyor that is located at the top of the drying oven and is constantly exposed to high temperatures, oxides may fall from the hanger and adhere to the product, and paint may be scattered around the area. Often contaminated.

In order to transport heavy objects using a suspended conveyor, each part, including the stays, must be made solid, which increases the overall size and cost.

In Utility Model Application No. 62-114679, "Paint Drying Equipment," the hanger for holding the object to be coated is rotated by a rack and pinion mechanism while the hanging conveyor is moved in a tact manner, so that there are no areas that are not hit by the heater. are doing. However, the rotatable angle is 180° or less, and as long as a hanging conveyor is used, the above-mentioned drawbacks cannot be eliminated.

(Problems to be Solved by the Invention) The main purpose of the present invention is to eliminate the drawbacks of coating equipment using a suspended conveyor line, by downsizing the entire equipment, reducing heat loss, and improving the quality of the product. An object of the present invention is to provide a coating device that prevents contamination of the environment and surrounding areas.

Another object of the present invention is to provide an apparatus that can achieve complete coating without leaving any uncoated surfaces over the entire surface of the front, back, left, and right sides of the product by providing a rotating mechanism for the object to be coated along the conveyor line.

(Means for Solving the Problems and Their Effects) The above-mentioned objects of the present invention are to provide a plurality of pedestals on which objects to be coated are placed, an endless conveyor that connects and conveys the pedestals in series, and a conveyor that connects and conveys the pedestals in series. a means for driving in a tact manner, a mechanism for rotating the base disposed adjacent to the conveyor, and a painting gun disposed inside the line of the conveyor;
This is achieved by a conveyor-type rotary coating apparatus comprising a coating booth disposed adjacent to the outside of the conveyor line and a drying oven for drying the coated object after coating.

Based on this configuration, according to the rotary coating apparatus of the present invention,
Since the endless conveyor moves in a tactile manner, drying operations can be carried out with the inlet and outlet of the drying oven closed, significantly reducing heat loss. In addition, the conveyor is not a hanging type, but a top type where the object to be coated is placed on a pedestal, so even if grease or oxides fall from the conveyor, it will not stick to the product, and the entrance and exit of the drying oven Since the drying oven does not remain open, there is no need to provide slopes called air isolation chambers before and after the drying oven, and the temperature distribution within the drying oven becomes uniform, allowing effective use of heat. Since it remains stationary while moving in a tact style, oil, dirt, paint, etc. can be disposed of at the stationary position, reducing the possibility of it being spread around. Since the object to be coated is placed on the pedestal, it does not fall from the hanger, which makes it safe and protects the product. Since the object to be coated moves in a tactile manner, a pedestal rotation mechanism can be provided, and it is possible to prevent uncoated paint. Since the conveyor moves in a tact manner, the coating process and drying process can be carried out while the object to be coated remains stationary, and the extra length of the conveyor becomes unnecessary, resulting in a compact apparatus.

In a second aspect of the present invention, a pedestal rotation mechanism includes a rotational drive chain disposed adjacent to a conveyor, a drive motor connected to a drive shaft of the chain, and a drive motor attached to the pedestal and engaged with the chain. Matching sprocket and
and means for locking the conveyor in position. With this configuration, the conveyor can be rotated while being fixed at a predetermined position, and the rotation angle can be freely selected.

In a third aspect of the present invention, a jig that runs along a guide rail on a ceiling surface facing a pedestal is attached,
The object to be coated can be attached between the pedestal and the jig. This makes it easy to coat a long, thin, pipe-shaped object, and provides an apparatus that takes advantage of the features of an electrostatic coating apparatus.

Other characteristics and advantages of the invention will become apparent from the following description with reference to the embodiments of the accompanying drawings.

(Embodiment) FIGS. 1 and 2 show the entirety of a conveyor-type rotary coating apparatus 10 according to a preferred embodiment of the present invention, including a large number of circular pedestals 12A to 12A on which objects to be coated are placed. 12R is an abbreviated shape that is endlessly connected with a hollow bin chain (
It is fixed on a conveyor 14 (plan view), and is intermittently fed at regular intervals by a tact-type drive mechanism 16 (see FIG. 5). To facilitate understanding,
Sixteen pedestals 12 are arranged, but this number can be freely selected.

The object to be coated is placed on the pedestal 12A, and is transported counterclockwise along the direction of the arrow, and when it reaches the pedestal 12E, it is moved by the pedestal rotation mechanism 18 (see FIGS. 6 and 7). After being locked into position, it is rotated by a motor.

A coating gun 2 of an electrostatic automatic coating machine 20 placed inside a conveyor line facing a rotating object to be coated.
Paint is ejected from 1.22 and flows into a paint booth 24 located adjacent to the outside of the conveyor line. Various types of atomizer 20 can be used, and the structure thereof is well known, so a description thereof will be omitted.

A general control panel 26 for controlling the entire coating apparatus is installed on the side of the coating booth 24.

When the painting is completed, the rotation of the pedestal is stopped, the lock is released, and the pedestal moves to the next position 12F.

When the object to be coated reaches this position, the entrance door 30 of the drying oven 28 slides open sideways, and the pedestal stops at a position 12G within the air curtain 32. At this point, the entrance door 30 slides closed to prevent hot air from escaping from inside the drying oven 28. The presence of the air curtain 32 prevents the hot air inside the drying oven from escaping even at the moment the entrance door 30 is opened.

The drying oven 28 is a hot air circulation type drying oven, and is equipped with a gun-type burner, a heat-resistant circulation fan 36, a register gear, etc., and its ceiling is flat and does not have a slope like a conventional drying oven. Not yet.

The object to be coated, which is sent through the drying oven 28 in a tact manner and after a predetermined drying time has finished, passes through the air curtain 32 at a position 12P, the exit door 38 is opened, and the object is sent outside.

When the pedestal reaches position 12R, the coated object that has been painted and dried is taken out from the conveyor line and sent to the next process.

In Fig. 2, a jig 40 for setting the object to be coated is fixed on each pedestal, and Fig. 3 shows a top view of this jig 40, and Fig. 4 shows a jig 40 for setting the object to be coated. As shown, paint is ejected from the paint guns 21 and 22, and the pipe-shaped object W to be painted is coated.

In FIGS. 3 and 4, a jig 40 has conical receiver plates 41 fixed to its upper part, and these receivers have three plates 41 on the inner circumference and nine plates on the outer circumference. A total of 12 pieces are arranged at equal intervals. By arranging an odd number of pieces on one circumference in this way, the paint ejected from the paint guns 21 and 22 hits the object W on the near side and before being sucked into the painting booth 24. It also adheres to the object to be coated W on the opposite side of the circumference, which has the advantage of improving coating efficiency. The painting guns 21 and 22 are mounted at different angles to eliminate unpainted areas, and are movable up and down.

FIG. 5 shows a mechanism for driving the pedestal 12 in a tact manner. A sprocket 46 for rotational driving is fixed in the middle of the central shaft 45 of the circular pedestal 12, and the central shaft 45 itself is inside a bearing 47. It is slidably supported so that it can rotate freely. The bearing 47 is fixed on a rectangular steel plate 48, and ball bearings 49 are attached to the lower surface of the steel plate 48 near both ends so that the bearing 47 can run on the guide rail 50.

The aforementioned hollow pin chain type conveyor 14 is attached to the lower end of the bracket 52 fixed to the center of the lower surface of the steel plate 48, and the chain engages with a drive sprocket/nod 53 arranged on the side and is sent back and forth. .

A dork mink 55 is connected to the lower end of the mounting shaft 54 of the sprocket 53, and a sprocket 56 is connected to the sprocket 56 on the input side.
is connected to the gear motor o via a chain 57, a sprocket 58, and a speed reducer 59. motor 60
is driven at predetermined time intervals in response to a signal from the control panel 26 described above, and thus the pedestal 12 is transported in a tact-like manner.

FIGS. 6 and 7 show a mechanism 18 that locks and rotates the base when the object to be coated reaches the coating position 12E in FIG. 1. As shown in FIG. 6 and the above-mentioned FIG. The other end of the rack receives driving force from a motor 67 via a chain 65.

On the other hand, positioning holes 68 for locking are bored at symmetrical positions on the upper surface of the steel plate 48 connected to the conveyor. Further, an electric or optical sensor 69 is attached adjacent to the steel plate 48.

When the sensor 69 operates and detects that the object to be coated has arrived at the coating position 12E, the locking mechanism shown in FIG. 7 starts operating, and the rod of the air cylinder 7o is extended and fixed to its upper end. Push up the pin 71 and open the positioning hole 6.
Push it into 8.

As a result, the steel plate 48 is prevented from swinging back and forth and to the left and right, and is fixed in that position. The sprocket 46 fixed in the middle of the center shaft 45 of the pedestal 12 starts engaging with the chain 62 immediately before arriving at position 12B, and at position 12E it starts engaging with the center part of the chain 62. (See Figure 1). At this point, the motor 67 starts rotating, and the central shaft 45 and pedestal 12 rotate via the chain and sprocket. The object W placed on the pedestal 12 is coated as shown in FIG.

When the painting is finished, the motor 67 stops, the rotation of the pedestal stops, the air cylinder 70 contracts, and the pin 71 moves into the hole 68.
The material to be coated is removed, and the conveyor 14 starts moving to transport the object to be coated forward.

FIG. 8 shows an embodiment in which a long pipe is coated as the object W to be coated. On the lower side, an annular jig 8o is placed in place of the jig 40 shown in FIG. The center shaft 84 of the upper jig 83 is configured to slide and run between the guide rails 82.

The object W to be coated is mounted on the lower jig 80 with a metal fitting 8.
5 and a clamp fitting 86 attached to an upper jig 83, respectively, and is painted while rotating on a pedestal. In order to prevent the center shaft 84 from swinging during this rotation, a yoke 87 extending toward the center shaft 84 and an air cylinder 88 for driving the yoke 87 are arranged.

(Effects of the Invention) As explained in detail above, according to the rotary coating apparatus of the present invention, the endless conveyor moves in a tact manner, so drying work can be carried out with the inlet and outlet of the drying oven closed. As a result, heat loss is significantly reduced. Since the conveyor is not a hanging type but a top type where the object to be coated is placed on a pedestal, there is no need to provide a slope called an air isolation chamber before and after the drying oven, and the temperature distribution inside the drying oven is improved. Heat is evenly distributed and used effectively. Since it remains stationary while moving in a tact style, oil, flakes, paint, etc. can be disposed of at the stationary position, reducing the possibility of it being spread around.

Since the object to be coated is placed on the pedestal, it does not fall from the hanger, which makes it safe and protects the product. Since the object to be coated moves in a tactile manner, a pedestal rotation mechanism can be provided, and it is possible to prevent uncoated paint.

Since the conveyor moves to the second cycle, the coating and drying processes can be performed while the object is stationary, eliminating the need for extra length of the conveyor, making the equipment more compact and reducing costs. Ru. Furthermore, by arranging the pedestal and the jig vertically opposite each other, the technical effects are extremely remarkable, such as making it easier to coat long objects.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a rotary coating apparatus according to a preferred embodiment of the present invention, FIG. 2 is a front view of the apparatus, FIG. 3 is a plan view of a jig for placing an object to be coated, and FIG. FIG. 5 is a side sectional view of the conveyor drive mechanism, FIG. 6 is a perspective view of the pedestal rotation mechanism, FIG. 7 is a side sectional view of the conveyor lock mechanism, and FIG. 8 is a side sectional view of the conveyor drive mechanism. FIG. 2 is a perspective view showing a mounting jig for coating. 10... Painting device 12... Pedestal 14...
Conveyor 16... Drive mechanism 18... Pedestal rotation mechanism 20... Painting machine 21° 24 ・ 28 ・ 32 ・ 45 ・ 46 ・ 48 ・ 50 ・ 22 . . . Painting gun... Painting booth 26...・Control panel・Drying oven
30.38...Door...Air curtain 40.
...Jig...Center shaft...Sprocket 47...Bearing

Claims (1)

[Scope of Claims] 1. A plurality of pedestals on which objects to be coated are placed, an endless conveyor that connects and conveys the pedestals in series, means for driving the conveyor in a tact manner, and a means adjacent to the conveyor. a mechanism for rotating the pedestal arranged in the direction of the conveyor, a painting gun arranged inside the line of the conveyor, a painting booth arranged adjacent to the outside of the line of the conveyor, and an object to be coated after painting. A conveyor-type rotary coating device characterized by comprising a drying oven for drying. 2. The pedestal rotation mechanism includes a rotational drive chain disposed adjacent to the conveyor, a drive motor connected to a drive shaft of the chain, a sprocket attached to the pedestal and engaged with the chain, and the and means for locking the conveyor in position. 3. The apparatus according to claim 1, wherein a jig is mounted to face the pedestal and run along a guide rail on a ceiling surface, and an object to be coated can be mounted between the pedestal and the jig.