JPS5941787B2 - Continuous electrostatic powder coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous electrostatic powder coating device, and more particularly to a device for automatically electrostatically coating synthetic resin powder onto the inner surface of a cylindrical body.

In recent years, the demand for extruded aluminum tubes has been increasing, and recently the inner surface of aluminum tubes has been coated with synthetic resin to make the aluminum corrosion resistant, and to take advantage of the aluminum tube's inherent shape retention properties, it has become easier to flow. They tend to be used as containers for sexual substances.

This invention was developed to meet the demand for aluminum tubes.
An object of the present invention is to provide an automatic electrostatic coating device for synthetic resin objects suitable for mass production in which a synthetic resin coating film is formed on the inner surface of an aluminum tube by electrostatic powder coating. Currently, extruded aluminum tubes are produced in large quantities at extremely high speeds, with a single production machine having a capacity of tens to hundreds of pieces per minute. If the inner surface coating of the machine can be treated at the same time, it will significantly contribute to reducing the production cost.

The duct method is often used as a method for processing large quantities of products, but this method increases the apparent processing speed by performing the same processing on many items at once. The disadvantage is that the process equipment for performing one process becomes large, and the equipment cost increases because a large amount of the same equipment and parts are required to process one process.

The present invention provides an electrostatic coating equipment that is small enough to be easily connected directly to aluminum tube production equipment, and that is capable of painting in line with mass production. be.

In cylindrical body production lines, systems for horizontally moving cylindrical bodies that utilize rolling of the cylindrical bodies are often used because they enable high-speed movement processing.

On the other hand, in the case of internal coating, it is preferable to perform the coating in a vertical position in order to satisfy the conditions of uniformity of film thickness and pinhole-free condition. Further, in general, the speed of electrostatic coating on the inner surface of the tube is required to be 1 to 2 seconds per tube.

Therefore, in this invention, the electrostatic coating requires 1-
By simultaneously carrying out the steps of changing the direction of the cylindrical body from horizontal to vertical, loading, coating, and unloading all at once in 2 seconds, the vertical position is pinhole-free. An object of the present invention is to provide an apparatus that performs electrostatic coating with a uniform film thickness at high speed. The invention can also be used in automated equipment for mass production of other packages such as paper containers and other metal containers. According to the apparatus of the present invention, the coated tube bodies are continuously coated from the coater, which enables high-speed automatic processing because loading, coating, and unloading are completed in one operation using the indexing table. Since the baking process is carried out in one step, the throughput of the next baking process is much easier compared to the duct method, and the production speed is improved.Since the coating is carried out in a vertical position, a uniform product is produced, and the yield is high and the cost is high. Only a small number of electrostatic coating devices are needed for coating, the device is simple and compact, and the device is cheaper than the duct method.It can be easily incorporated into the production line for cylindrical objects such as aluminum tubes, and it is easy to handle. It has the following characteristics: does not impair continuous performance.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the continuous electrostatic powder coating apparatus of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the continuous electrostatic powder coating apparatus of the present invention, in which synthetic resin powder is applied to the inner surface of a cylindrical object with one end closed. .

The continuous electrostatic powder coating device 1 of the present invention includes a supply device 2 that supplies one object to be coated A, and a coating handling device 4 that continuously coats the supplied object A. Become the lord. The supply device 2 includes a conversion device 15 that changes the orientation of the object A placed horizontally into a vertical direction, and receives the object A whose orientation has been changed in the vertical direction from the conversion device 15 and supports it in the vertical direction. It is equipped with a supply operation board 11 having a support rod 12, and a cylinder piston device 20 that transfers the object to be coated A from the conversion device 15 to the supply operation board 11. The converting device 15 has a suction support member 16 provided at the tip of an arm 17 that is rotatable around a shaft 18, and when one end of the object to be coated A is positioned on the suction support member 16 as shown in the figure. , suction support member 1
The air in the hole 6 is made negative pressure to suction and support the object A, and then the arm 17 is rotated by 90 degrees around the shaft 18 to change the orientation of the object A to the vertical direction. . A cylinder-piston device 20 is provided above the object A whose direction has been changed in the vertical direction, and this pushes the object A downward to apply the object onto the support rod 12 on the supply operation board 11. Kimono A
is covered. The supply operating board 11 is indexed and rotated together with a shaft 13, and support rods 12 are provided on the board at equal angles, for example, at an angle of 90 degrees.
The article A to be coated is placed on the coated article A. Also,
The supply operation plate 11 is configured to be operated for index rotation in synchronization with the coating operation plate 22 of the coating handling device 4. The coating handling device 4 includes a coating operation plate 22 which can rotate together with the shaft 23 and is slidable up and down along the shaft 23 by means of a key 24, and a coating operation plate 22 which can be slid up and down on the coating operation plate 22. It has a piston-cylinder device 29 that operates via a connecting support member 28, and an electrode device 32 for electrostatic powder application provided at the application position.

A plurality of holes 26 through which the object to be coated A is penetrated and supported are provided in the coating operation plate 22 at equiangular intervals, for example, 900 degrees, and the inner surface of the hole is made of a hollow rubber-like material having a triangular cross section, for example. An elastic ring 27 is attached. elastic ring 27
protrudes slightly inward from the inner surface of the hole 26 so that when the object A is inserted into the hole 26, the object A can be held by the elastic force of the elastic ring 27.
The lower end of a connecting support member 28 that extends around the upper end of the shaft 23 is fixed to the coating operation plate 22, and the upper end of this connecting support member 28 is connected to a piston rod of a cylinder piston device 29. The application operation plate 22 is moved up and down by the operation. When the coating operation plate 22 is lowered from the illustrated position to the position indicated by the chain line,
Since the object to be coated A held in the hole 26 of the coating operation plate 22 is placed on the electrode device 32, at this time the electrode device 32
The charged powder is injected from the wafer and applied to the inner surface of the object A to be coated. At the same time, the empty hole 26 of the coating operation board 22 is fitted into the workpiece A supported by covering the support rod 12 of the supply operation board 11 at a position corresponding to this electrode device 32, and the elastic ring 27 causes the workpiece to be coated. Since A is held, the electrode device 32
When the electrostatic coating of the inner surface of the object A is completed and the coating operation board 22 is pulled up, the object A is also pulled up from the support rod 12 of the supply operation panel 11. Then, the coating operation is performed. The disk 22 is rotated by a required angle, for example, 90 degrees, by an indexing device 25 such as a Geneva mechanism, and the object A, whose inner surface is coated with powder, is transported to an unloading position and held by an appropriate gripping device. The upper end is gripped by 34. In this way, the coating operation board 22 is lowered to perform electrostatic coating again, and the coated object A gripped by the gripping device 34 is pulled out from the coating operation panel 22 and handled for coating. The device 4 is unloaded. The electrode device 32 itself is used for ordinary electrostatic powder application, and is supplied with powder and air, and a high voltage is applied to it to spray the charged powder from the tip injection port. .

The gripping device 34 in the unloading position may be of any suitable structure, for example, as shown in FIG.
This allows the upper end of the object A to be gripped.

The gripping member 36 is an elastic member 3 that can be expanded by supplying air.
7, and when the gripping member 36 is closed to grasp the upper end of the object A brought to the unloading position, air is supplied and the elastic member 37 is expanded, and the upper end of the object A You can firmly grasp the top edge. According to the continuous electrostatic powder coating apparatus of the present invention configured in this way, the object A to be coated is sent out from an appropriate storage device (not shown) such as a hopper and transferred to the conversion device. When the article A is placed on the suction support member 16 of No. 15, it is suction-supported by the suction support member 16, and then the arm 17 is rotated by the frame 90 to hold the object A vertically in the longitudinal direction.

At this time, the cylinder-piston device 20 is activated, the piston pushes down the object A, and the object A is placed on the support rod 12 of the supply operation board 11 while sliding on the suction support member 16. The supply operation board 11 on which the material to be coated A is attached is connected to the application operation board 22 of the application handling device 4.
It is indexed and operated at a required angle, 900 in this case, in synchronization with the angle. Therefore, the object to be coated A is positioned at the arrival position a by performing the indexing operation twice. At this arrival position a, the object to be coated A fits into the hole 26 of the coating operation disk 22 when the coating operation disk 22 is pushed down by the cylinder piston device 29 during the coating operation, and due to the elastic force of the elastic member 27. It is held by the coating operation board 22. Therefore, coating position b
When the coating operation board 22 is lifted upward at the end of coating of the object A, the object A at the arrival position a is lifted upward together with the application operation disk 22, and the application operation board 11 is It is pulled out and separated from the support rod 12. In this way, the article A to be coated that has arrived at the coating operation board 22 at the arrival position a is 2
After the second indexing operation, it is located at the coating position b.

In the coating process at the coating position b, the coating operation plate 22 is first pushed downward along the shaft 23 by the cylinder piston device 29 via the connection support member 28. Next, charged powder is ejected from the tip of the electrode device 32,
Electrostatic coating is performed on the inner surface of the object A to be coated, which is lowered to cover the electrode device 32. Cylinder piston after electrostatic coating? When the coating actuating plate 22 is lifted by the lifter 29, the article A to be coated at the loading position a is loaded onto the coating actuating plate 22. After coating is completed, the coating actuation plate 22 is lifted upward, and the coating actuation plate 22 is indexed and the object A to be coated is positioned at the unloading position c. This unloading position c
The upper end of the object to be coated A is gripped by the gripping member 36,
Since the elastic member 37 is expanded by supplying air and can be firmly gripped, the object A to be coated can be pulled out from the coating operation plate 22 when the coating operation plate 22 is lowered in the next coating operation. Therefore, by rotating the arm 38, the object to be coated A can be delivered from the unloading position c to the next heat treatment device (not shown). In this way, the object to be coated A is supplied. , each process of loading, coating, and unloading is carried out reliably and quickly, resulting in zero
．． A high-speed continuous electrostatic powder coating device that can perform coating processing in a short time of 5 to 2.5 seconds and is suitable for mass production is obtained.

Moreover, since the structure of each part mechanism can be easily configured, each operation can be performed reliably and it can be manufactured durable and at low cost. In addition, in the above explanation, each coated object is 90,
Although it has been described that the actuator is operated at an indexing angle of 45 to 60 degrees, it is of course possible to process two objects at a time at any desired angle of 45 to 60.

[Brief explanation of the drawing]

Fig. 1 is a schematic partially sectional elevational view showing an embodiment of a continuous electrostatic powder coating device according to the present invention, and Fig. 2 is a schematic plan view showing the relationship between the coating operation panel and the supply operation panel. 3 are partial views showing a gripping device for unloading. In the figure, 2... supply device, 4... coating handling device, 11... supply operation panel, 12...
・Support rod, 15... Conversion device, 22...
・Painting operation panel, 23...shaft, 25...
Indexing device, 26... Hole, 27... Elastic member, 20, 28... Fluid operated cylinder piston, 32... Electrode device.

Claims (1)

[Claims] 1. An object to be coated that is indexed together with a shaft that is indexed and rotated with the required number of divisions, is provided so as to be slidable in the axial direction along the shaft, and is arranged in accordance with the indexing angle. A coating operation plate having a holding hole, a drive device for moving the coating operation plate up and down, a coating handling device having the coating operation plate, and an indexing operation of the coating operation plate in order to load the material to be coated onto the coating operation plate. A supply operation board that indexes and operates in synchronization with the supply operation board, and an upright support rod for supporting the coated material placed on the supply operation board corresponding to the indexing angle, and a support rod for supporting the coated material from the storage and supply area in the vertical direction. and a separate fluid-actuated cylinder-piston device for vertically moving the vertically diverted material over and supported by a support rod of the feed operating plate. Continuous electrostatic powder coating equipment with equipment.