JP2532541Y2 - Article transfer device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for conveying articles such as cans for cans along a table by air pressure.

[0002]

2. Description of the Related Art As shown in FIG. 2, a large number of air ejection holes 2 inclined toward a downstream side are provided on a table 1 formed in a predetermined pattern, and an air supply hole provided below the table 1. A duct 3 connected to a source of pressurized air is provided. In the air ejection hole 2, air 4 capable of maintaining a static pressure such that air 4 of a speed and quantity sufficient to lift and convey articles on the table 1 is ejected. There has been proposed a static pressure type article conveying apparatus suitable for conveying articles such as can bodies for cans to be supplied (for example, JP-A-56-155118).

[0003] Since the can body for canning is relatively lightweight and small in diameter, the diameter of the air ejection hole 2 is relatively small, for example, about 2 mm. The table 1 has a thickness of about 8 mm so that the directionality of the air can be obtained, and is a relatively hard synthetic resin plate such as a bakelite plate and easy to perforate the air ejection holes 1. Is made up of The use of a metal plate as the material of the table 1 means that the cost of perforating the air ejection holes 2 is higher than that of a synthetic resin plate because the thickness is larger than the hole diameter, and the material cost of an aluminum plate or a stainless steel plate is higher than that of a synthetic resin plate. In addition, it is not preferable that the carbon steel sheet is easily rusted, and the aluminum plate is not preferable in that the ground portion of the can body is rubbed and black aluminum powder adheres.

Conventional table 1 made of a single synthetic resin plate
In the case of an article transporting apparatus using the method described above, a deposited layer 5 of fine powder is formed in the vicinity of the lower portion of the relatively small-diameter air ejection hole 2 and clogging is likely to occur. In the extreme case, it becomes completely clogged after about half a year of use, so that a problem arises that the work must be stopped and disassembled and cleaned each time.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a static pressure type article conveying apparatus which is relatively inexpensive in manufacturing cost and hardly causes clogging of air ejection holes.

[0006]

According to the present invention, there is provided an article conveying apparatus comprising: a table having a plurality of air ejection holes inclined toward a downstream side; and a pressurized air source provided below the table. An apparatus for conveying articles along a table, comprising a duct connected to the table, wherein the table is mainly composed of a synthetic resin plate, and a conductive film that is coated on the lower surface of the synthetic resin plate and grounded. I do.

[0007]

When the components of the deposited layer were examined, it was found that the layer consisted mainly of carbon black fine powder. A filter is provided between the duct and the source of pressurized air.
Since a removal type (having a diameter of 100 μm or more) is used, general dust such as sand and fiber can be removed, but about 50
It is considered that the fine carbon black powder having a diameter smaller than μm passes through the filter and enters the duct. If a high-performance filter for a so-called clean room is used, carbon black fine powder can be almost completely removed, but this is not preferable because it is expensive and the air pressure loss in the filter is large. In particular, in the case of a can-making factory, since a large number of combustion devices such as gas ovens for drying paint are installed, the air around the device contains a relatively large amount of fine carbon black powder.

[0008] While a large number of can bodies usually contact each other,
Along the table 1 consisting of a conventional synthetic resin plate alone, it is slightly lifted by the static air pressure and transported.
During this time, the can body tilts, and the grounding portion 10d of the can body (FIG. 1)
) Often comes into contact with the upper surface of the table, and static electricity is accumulated on the table 1. The fine carbon black powder in the air 4 is
It is considered that the toner is electrostatically attracted to the charged table 1 near the inlet of the air ejection hole 2 and develops into the deposition layer 5.

In the case of the present invention, the table is mainly composed of a synthetic resin plate and a conductive film coated on the lower surface thereof. The conductive coating is grounded. Therefore, even if the synthetic resin plate of the table is temporarily charged, the static electricity is immediately grounded, so that the static electricity does not accumulate on the table. Therefore, the carbon black fine powder does not deposit near the inlet of the air ejection hole. The synthetic resin plate coated with the conductive coating is relatively inexpensive, and the air ejection holes can be easily drilled with a drill. Further, the filter may have a normal performance such that the carbon black fine powder passes. Therefore, the manufacturing cost of the transfer device is relatively low.

[0010]

In FIG. 1, reference numeral 11 denotes a table in which a number of air ejection holes 12 inclined toward the downstream side are formed in a predetermined pattern, for example, the vertices of an isosceles triangle which is alternately and continuously connected in the opposite direction. Is formed at the position. Air outlet 12
Is about 2 mm, for example, the length d of the base of the isosceles triangle.
Is, for example, about 25 mm, and the side length is, for example, about 12.5 m
m, and the inclination angle θ of the air ejection hole 12 with respect to the vertical line is about 3 to 60 degrees, preferably about 15 to 40 degrees.

The table 11 is composed of a synthetic resin plate 13, for example, a bakelite plate (having a thickness of, for example, 8 mm) and an aluminum foil 14 (having a thickness of, for example, 20 μm) bonded to the lower surface thereof with an adhesive.
Is grounded. The difference between the cost of an aluminum foil bonded bakelite plate and the cost of a bakelite plate having substantially the same thickness is small, and the formation of the air ejection holes 12 by drilling the former plate is similar to that of the bakelite plate. Easy to do. During drilling, a saw-toothed uneven portion is formed around the hole of the aluminum foil 14, and the uneven portion is preferable because it promotes electric discharge. The air pressure of the duct 3 is usually about 20 to 300 mm water column, preferably about 60
~ 200 mm water column. The duct 3 is connected to a pressurized air source via an air filter (not shown) of a dust removal type.

Reference numeral 15 denotes a cover plate parallel to the table 11, and the distance s between the two is set to be slightly larger than the height of the can 10 to be conveyed. 16 and 17 are an upper guide rail and a lower guide rail of the can 10, respectively. The can body 10 floats by the static air pressure formed between the bottom 10a and the table 11, and the end face 10b
Is in contact with the lower surface of the cover plate 15,
The surface on the upstream side of c is pressed by the air 4 ejected from the air ejection holes 12 and conveyed along the table 11 in the direction of arrow A. Since the filter is of a coarse dust removal type, the air 4 contains dust mainly composed of carbon black fine powder having a diameter of about 50 μm or less, but the grounded table 11 is not charged. It does not substantially accumulate near the inlet of the air ejection hole 12.

The present invention is not limited by the above embodiments. For example, the conductive coating may be made of a conductive paint.

[0014]

According to the present invention, the static pressure type article conveying apparatus of the present invention has an effect that the manufacturing cost is relatively low and the air ejection hole is hardly clogged.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an apparatus according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a conventional device.

[Explanation of symbols]

 3 Duct 10 Can body (article) 11 Table 12 Air outlet 13 Synthetic resin plate 14 Aluminum foil (conductive film)

Claims (1)

(57) [Scope of request for utility model registration] 1. An article along a table, comprising: a table having a plurality of air ejection holes inclined toward a downstream side; and a duct connected to a source of pressurized air provided below the table. In the apparatus for transporting
An article conveying device mainly comprising a synthetic resin plate and a grounded conductive film coated on the lower surface of the synthetic resin plate.