JPS601256B2 - Device that conveys strips in a floating state - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for conveying a strip of material in a floating state.

More specifically, the present invention has a plurality of suspension nozzles disposed above and below the plane of the strip, across the conveyance direction, and sequentially arranged in the conveyance direction, and each of the suspension nozzles forms an air cushion. The present invention relates to a device for conveying a strip in a floating state, which comprises two slots or rows of holes with opposite blowing directions. The suspension nozzle used in the above-mentioned device is an air cushion nozzle (air-cushion nozzle).
Cushion-nozzle).

Note that the device for conveying a strip in a floating state includes a device using the air cushion nozzle described above and an air nozzle using an airfoil member (
air/foil shaped nozzle
(also called zles). As mentioned above, the former device has two nozzles (one suspension nozzle having blowing directions facing each other).
The latter device has a plurality of combinations each consisting of one nozzle and one airfoil-shaped molded body arranged downstream of the nozzle. It is characterized by being arranged consecutively. The latter device is, for example, a patent application filed on September 3, 1965 by the same applicant as the applicant of the present invention under the title of “device for stabilizing a long web guided in a floating state.” As disclosed in Japanese Patent Publication No. 40-53839 (see Japanese Patent Publication No. 50-39915), it is a device for stabilizing long strips, such as cloth strips or plastic films, which are guided in a floating state. A spray medium is arranged on one side or both upper and lower sides of the elongated strip and extends perpendicularly to the longest strip, and is sprayed at an acute angle to the elongated strip. A plurality of nozzles ejecting water in a directed manner are located one after the other in the direction of movement of the elongated strip, each nozzle being formed by two nozzle walls having edges on the side of the elongated strip, and , a downstream nozzle wall extending opposite to the upstream nozzle wall end green when viewed in the oblique flow direction of the spraying medium, the projection point of the upstream nozzle wall end green projected onto the downstream nozzle wall; If the nozzle opening is measured in a vertical plane extending in the longitudinal direction of the long strip with respect to the plane of the long strip, the diagonal direction of the spraying medium flow If the length of the perpendicular drawn from the upstream nozzle wall edge green to the virtual extension line of the downstream nozzle wall is the nozzle closing cross-sectional width B, then the extension part of the downstream nozzle wall An airfoil having a length corresponding to at least twice and at most seven times the nozzle closed cross-sectional width B formed by the side nozzle walls, and between each nozzle, airfoils that apply suction force to the elongated strip. This is a device for stabilizing the longest strip-like object guided in a floating state, characterized in that a cross-sectional molded body is arranged.

In other words, in the latter device, the air blowing directions of all the nozzles arranged in series are all oriented in the same direction, and the airflow blown out from the nozzles in the same direction is caused by airfoils arranged downstream of the nozzles independently of the nozzles. A positive pressure is generated between the molded back part on the upstream side of the cross-sectional molded body between the belt-shaped material and the belt-shaped material to push it up, while a negative pressure is created between the molded material and the belt-shaped material in the trailing region of the molded back part. This is a device that provides a traction action using the push-up action and the traction action to ensure the floating of the strip material. Therefore, in the latter device, it is more preferable that a plurality of nozzles and a plurality of airfoil cross-section molded bodies are arranged on both sides of the strip, but they may also be arranged only on the lower side, or vice versa. may be placed. If the strip is placed only on this upper side, the strip will be lifted upward by the traction action caused by the negative pressure generated in the trailing region of the molding back. On the other hand, in devices known as air cushion nozzles to which the present invention belongs, the mutually opposing blowing directions of the two slots of each nozzle are the same with respect to a common central surface of the nozzles arranged on both the upper and lower sides of the strip. and the two slots have the same cross-sectional area.

In a device consisting of such an air cushion nozzle,
The cushioning effect of the pressure air of the air cushion, which increases as the strip approaches and the gap between the slot and the slot narrows, acts to prevent the strip from coming into contact with the slot, which prevents the strip from floating without complete contact. achieved. That is, in the air cushion nozzle, floating of the strip is achieved using only two nozzles having blowing directions facing each other, without using an airfoil cross-section molded body as in the case of the air nozzle using an airfoil member described above. . By means of the rasping arrangement of the opposed nozzles, conveyance of the strip in a wave-like manner is achieved, which is favorable for a stable floating condition, and which no one would normally wish to discontinue. .

Furthermore, this device is advantageous for guidance in corrugated form, since this device acts as an article storage, which balances out small errors in the conveyance of the strips before and after the device for floating guidance. Has secondary effects. Although the angles of inclination of the two slots or rows of holes of each suspension nozzle with respect to the path in the blowing direction are usually selected to be the same, it is also possible to select and use different angles.

In such known air cushion nozzles, it is known that the blown air flows from the air cushion to both sides over slits in the air travel path existing between the individual nozzles (German Published Patent Publication No. 129208).
(See specification No. 2). Although it is possible to convey a strip in a floating state using such a conventionally known device for air cushion nozzles, it is possible to convey a strip in a floating state when using the same plurality of nozzles. It is recognized that the nozzle is different.

It has also been observed that the flotation characteristics of one such nozzle change during operation. With such properties, it has been discovered that it is possible to return to a predetermined behavior with respect to the floating characteristics of the slit in the duck direction, which may change during operation. In this known device, in the extreme case where the two nozzles have the same cross-sectional area and the angles of inclination of the blowing directions facing each other are the same, the cushioning effect may occur. It is practically impossible to determine the direction of air flowing out from the air J-cushion section. Therefore, although the above-mentioned conventionally known devices for air cushion nozzles are excellent at suspending strips, they are not suitable for conveying strips in a floating state. 2 Therefore, the present invention provides an improved method for transporting a strip in a suspended state, which does not undesirably affect the transport conditions formed by the nozzle even when the dimensions of the nozzle change due to temperature or manufacturing conditions. The purpose is to provide a device with improved performance. 2. The object of the present invention is to have a plurality of suspension nozzles arranged above and below the plane of a strip, across the conveyance direction, and sequentially arranged in the conveyance direction, so that each of the suspension nozzles forms an air cushion. a common central plane of the suspension nozzles arranged on the upper and lower sides of the strip, that is, between the upper nozzle and the lower nozzle, comprising two slots or rows of holes with blowout directions facing each other; Two slots of each L suspension nozzle in an apparatus for conveying a strip in a floating state in which the inclination angles of the blowing directions from the two slots or hole rows are different with respect to a horizontal virtual plane in the middle of the L suspension nozzles,
Alternatively, the cross-sectional areas of the hole rows have different sizes, and the cross-sectional area and the inclination angle are different from the air cushion portion formed between the two slots or the strip in the area between the hole rows 1 and 2. This is achieved by means of a floating web transport device characterized in that the respective suspension nozzles are mutually defined in such a way that the blowing air flows over one edge of the respective suspension nozzle. The invention is based on the recognition that flotation properties are affected by manufacturing inaccuracies and changes in the exit slot during operation.

Although these influencing factors cannot be predicted, they are eliminated by the present invention. Regardless of whether the blown air coming out of the slot for forming the air cushion flows in the conveying direction or in the opposite direction, the adjustment of the inclination angle and the cross section of the slot are predetermined in two steps, individually or together. be able to. Therefore, with the device of the present invention, strips which cannot be transported in a floating state using conventional devices can be transported completely without flapping or lateral movement, and without any contact. Regarding the flotation properties, the invention can be improved by ensuring that the composite blowing direction of each suspension nozzle located on both sides of the strip has the same directionality. This arrangement is generally more advantageous than an arrangement of opposed suspension nozzles with alternating resultant blow directions. however,
This preferred arrangement does not exclude that alternating arrangements in the individual regions of the device according to the invention, for example at the inflow point or at the outflow point of the strip, are of course preferred. For a gently inclined blowout direction, the possible inclination angle of the blowout direction is loo ~ 30o, preferably between 150 and 200, while for a steeply inclined blowout direction the slope angle is between 450 and 800. , preferably 600-650.

0 The present invention will be described in detail below based on an embodiment shown in the accompanying drawings.

FIG. 1 shows a known air cushion nozzle.

Air is directed by the connecting blowing box 4 into the slots 1, 2 and the holes in the perforated plate 3. The blow jets are directed toward each other. The inclination angle Q of the blowing direction a is 1oo to 30o, preferably 1
5o to 200, and on the other hand, the inclination angle P of the blowing direction b
Is it 4? -80°, preferably 600-650°. In this case, the exit cross section is equal to zero. However, instead of different mirror oblique angles Q,8, different exit cross-sections can be selected. It is also possible to vary both the angle of inclination and the exit cross section. Obtaining a restricted flow direction of the blowing sog means from the area of the air cushion is ensured by one or two stages. The device shown in Figure 2 has lower and upper suspension nozzles 5 to 1.
0, these nozzles are arranged transversely to the direction F', between which the strip 11 is conveyed in a wave-like manner. The running of the waves is regulated on the basis of the jet air cushions blown out from the suspension nozzles 5 to 10 that impinge on the strip. The upper suspension nozzles 8 to 1 are arranged opposite to the gap between the lower suspension nozzles 5 to 7. The lower suspension nozzles 5 to 7 on one side and the upper suspension nozzles 8 to 10 on the other side are in the same state with respect to their blowing directions a and b. In other words, one blowing direction a has a gentle inclination angle Q and a conveying direction F.
The blowing direction b of the suspension nozzle, which is oriented at a steep angle of inclination 8 and has a steep inclination angle 8, is opposite to the conveying direction F. On such an arrangement, the opposing suspension nozzles 5/8, 8/6, 6/9, 9/7, 7 no 0 slots 1 with gently inclined inclination angles Q are steeply arranged in pairs. The slot 2 is approached with an angle of inclination 8 . The blowing directions a, b of the slots 2 arranged close to each other as a pair do not intersect but point away from each other, so that the strip 11 can even reach the lower suspension nozzles 5, 6 in the area of the nozzles. , 7 and the upper suspension nozzles 8, 9, 10' are thus ensured to be stretched. The blown air forming the air cushion flows out over the slots, 2 in the conveying direction F or vice versa, the blown air from the slots exhibiting minimal resistance to the air escaping.

That is, for example, if the cross-sections of slots 1 and 2 are equal, the slot 2 used is the slot with a steep inclination angle of 8, and if the oblique angles are equal, the slot 2 used is the slot with a small cross-section of 4. It is a slot with .

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of one suspension nozzle. Figure 2 shows a plurality of first
1 is a schematic side view of a device of the invention constructed from the suspension nozzle of the figure; FIG. 1, 2...slot, 3...
・Plate, 4...Connected blowing box, 5-1
0... Suspension nozzle, 11... Band-shaped object, F...
・Conveyance direction. Fne・1Fi9.2

Claims (1)

[Scope of Claims] 1. A plurality of suspension nozzles are arranged above and below the plane of the strip, across the conveyance direction, and arranged sequentially in the conveyance direction, and each of the suspension nozzles carries an air arc. comprising two rows of slots or holes having blowing directions facing each other to form the same, said two slots or holes relative to a common central plane of suspension nozzles arranged on both upper and lower sides of said strip; In an apparatus for conveying a strip in a floating state with different angles of inclination in the blowing direction from the rows, two slots or hole rows 1 of each suspension nozzle 5 to 10 are provided.
. A device for conveying a strip in a floating state, characterized in that the suspension nozzles 5 to 10 are mutually defined so that the blown air flows over one edge of the suspension nozzles 5 to 10. 2. The strip conveying device according to claim 1, wherein the flow direction of the blown air flowing over the edges of each of the suspension nozzles 5 to 10 is the same.
3 The inclination angle β of the blowing direction b of one slot 2 is 4
5° to 80°, preferably 60° to 65°, and the inclination angle α of the blowing direction a of the other slot 1 is 10° to
3. The strip conveying device according to claim 1, wherein the angle is 30[deg.], preferably between 15[deg.] and 20[deg.].