JPS6341658B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is applied to a machine for manufacturing ducts used for air conditioning, etc., and in particular, when constructing a duct that is usually called a button punch type. This invention relates to a seam folding machine that forms a seam folding section by folding a seam folding part into which a button formed on a side plate adjacent to the end of a piece of rough material is inserted and engaged.

[Prior art] There are many methods for manufacturing ducts by folding and combining the edges of fixed-length galvanized iron plates, but recently a method using fixed-length steel plates and assembling them using a simple seam folding machine has been developed. A so-called button punch method is often used.

To explain the button punch type duct in detail, Fig. 2 shows the duct that has been assembled. 1 is the top plate, 2 is the side plate, and these are assembled at the half-folded part 3. Details of the main parts of the upper plate 1 are shown in FIG. Vertical folds 4 are bent at right angles at the ends of the top plate 1, and the required number of buttons 5 are bent at right angles to the vertical folds 4.
It is folded out in the direction of the inner surface using a press or the like to form a hook. The side plate 2 is attached at the upper end as shown in Figure 7.
It is bent 180 degrees to form a descending part 6, slightly rounded to form a rising part 7, and then reversed again to form a catch part 8, so that there is a gap between the descending part 6 and the rising part 7. It serves as a button insertion portion into which the button 5 of the upper plate 1 is inserted.

FIG. 8 shows a state in which the upper plate 1 and the side plate 2 are combined. A plurality of buttons 5 provided on the vertical folding part 4 of the top plate 1 are inserted into a button insertion part between a descending part 6 and a rising part 7 formed at the upper end of the side plate 2, and are further inserted into a hook part 8. engage with. Therefore, when the button 5 is inserted into the button insertion portion, the engagement relationship between them will not come off, and the elasticity of the seam-folded portion will firmly form one corner of the duct.

[Problem to be solved by the invention] Now, the duct manufactured in this way is used for air conditioning, etc. after being insulated and coated as necessary, but the conditioned air flowing inside the duct is Since the pressure is usually positive, a simple cross-fold structure as shown in Figure 3 will cause a leakage of 5 to 10%. Therefore,
For small ducts, sealing material 9 was applied from the outside as shown in FIG. 4, and for large ducts, which were entered by workers, sealing material 9 was applied from inside the duct to prevent leakage.

However, these methods are performed after the duct is assembled, and require a large amount of human labor, and despite this, they are not able to completely prevent leakage.

In particular, it is impossible to inject sealant between the folded parts once bent, so apply the sealant only on the surface of the joint between top plate 1 and side plate 2. Therefore, the seal width is small and the sealing effect is low, and at the same time, the sealing material rises or drips on the duct surface, resulting in a dirty appearance.

The purpose of the present invention is to solve the problems of the prior art as described above, to seal the part at the same time as the button punch is assembled, and to eliminate the need for applying sealing material after assembling the duct, reducing the number of manufacturing steps. To provide a duct folding machine capable of obtaining a duct which is excellent in gas leakage prevention effect and with little protrusion of sealing material onto the surface.

[Means for Solving the Problems] In order to achieve the above object, in the duct folding machine of the present invention, a plurality of sets of upper rollers having a convex shape and lower rollers having a concave shape are provided; A button insertion part forming part that forms a substantially V-shaped button insertion part with an open upper surface at an end of a raw material by sequentially forming a plurality of sets of roller molds into acute-angled shapes starting from the first set.

b. A lower roller having a concave shape that is the same as that of the lower roller of the final group of the button insertion part forming part, and the approximately V-shaped button insertion part formed by the button insertion part forming part can be left as it is. A transfer section that transfers while maintaining its shape.

c. A sealing material injection device that is disposed near the transfer section and injects a sealing material from above into the approximately V-shaped button insertion section.

d. A seam folding section disposed downstream of the transfer section and comprising a plurality of sets of upper rollers and lower rollers for folding the substantially V-shaped button insertion section into the lower surface of the flat material.

It is characterized by adopting the constituent requirements a to d above.

[Operation] In the present invention having the above configuration,
With the button insertion part formed into a roughly V-shape with an open top, it is possible to inject the sealant from above, which prevents the sealant from dripping from between the button insertion parts and prevents the sealant from dripping during the folding process. Sealing material can be injected.

In particular, since the approximately V-shaped button insertion section is maintained in its shape for a certain period of time by the transfer unit equipped with a lower roller having an approximately V-shaped concave shape, the sealing material can be reliably injected. It will be done.

The substantially V-shaped button insertion part, into which the sealing material is injected, is bent flat by the last half-fold forming part, so that the sealing material spreads widely over the entire button insertion part.

As a result, when the button on the upper plate of the duct is inserted into this button insertion portion, the button engaging portion is sealed by the internal sealing material, making it unnecessary to apply a sealing material after the duct is assembled.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Fig. 1A shows the shape of each roller used in the cross-folding machine of the present invention, and Fig. 1B shows the folding of the rough material for the duct side plate that is passed between these rollers and folded. This shows the shape of the bent part.

In this example, the upper and lower rollers of ~ are
This constitutes the button insertion part forming part of component a in the present invention, and each upper roller is provided with a convex shape projecting downward, and the lower roller is provided with a concave shape that fits this convex shape. Among the rollers in the groups ~, the rollers in the later groups have more acutely pointed mold shapes, and as shown in Figure 1B, they are made from a flat plate of rough material with an open top. The V-shaped button insertion portion is formed by sequentially bending.

In the set of rollers, the concave shape of the lower roller is the same as the concave shape of the lower roller of the final set of rollers of the button insertion part forming part, and this is It constitutes a transfer section that transfers the approximately V-shaped button insertion section at the same angle α. That is, if the approximately V-shaped button insertion section is immediately bent flat, it will be impossible to inject the sealing material, so the presence of this transfer section is essential in the present invention.

FIG. 1C shows a sealing material injection device 10 provided near the transfer section, in this embodiment, between the pair of rollers. A sealing material 9 is injected into the button insertion portion.

The rollers of groups 1 to 2 are rollers constituting the seam fold forming part of component d of the present invention, and the button insertion part into which the sealing material is injected by these rollers is a rough flat plate. It is bent on the back side of the material, forming a seam fold. As shown in FIG. 1D, a sealing material 9 is spread over the entire area of the button insertion part within this folded part, and as shown in FIG. 1E, when the button of the duct upper plate 1 is inserted here, , the engaging portions of both are sealed with this sealing material 9.

[Effects of the Invention] As described above, according to the present invention, it is possible to inject the sealing material into the button insertion part at the same time as forming the folded part at the end of the flat material, and the duct Since the injection work of sealing material after assembly is not required, the duct assembly work can be facilitated. In addition, unlike applying sealant after assembly, the sealant can be injected deep into the button insertion area, making the seal wider, improving the airtight effect, and eliminating inconveniences such as sealant protruding. be done.

[Brief explanation of drawings]

FIG. 1A is a sectional view sequentially showing the shape of each roller constituting an embodiment of the duct folding machine of the present invention, and FIG. 1C is a sectional view showing an example of the sealing material injection device in the embodiment of FIG. 1A, and FIG. FIG. 1E is an enlarged sectional view showing one corner of a duct assembled using the cross-folded portion formed according to the embodiment of FIG. 1A. Figure 2 is a perspective view of the ducts assembled using the button punch method;
Figure 3 is a sectional view showing one corner of the duct, Figure 4 is a sectional view showing how the sealing material is applied from the outside, Figure 5 is a sectional view showing how the sealing material is applied from the inside, and Figure 6 is a sectional view showing the top of the duct. FIG. 7 is a perspective view showing the button formed on the plate, FIG. 7 is a perspective view showing the button insertion portion formed on the side plate of the duct, and FIG. 8 is a perspective view showing the engaged state of the button and the button insertion portion. . 1...Top plate, 2...Side plate, 3...Folded part, 4...
Vertical folding part, 5... button, 6... descending part, 7... rising part,
8...Hatch portion, 9...Sealing material, 10...Sealing material injection device, ~...Button insertion part forming part,...Transfer part, ~...Seam fold forming part.

Claims (1)

[Scope of Claims] 1. A cross-folding machine that forms a cross-folded portion at the end of a flat material of a duct by a combination of multiple sets of upper rollers and lower rollers, which has: a) a convex shape; A plurality of sets of an upper roller and a lower roller having a concave shape are provided, and the shapes of the rollers of the plurality of sets are sequentially formed into an acute-angled shape starting from the first set, so that a roughly V shape with an open upper surface at the end of the rough material is formed. A button insertion part forming part that forms a letter-shaped button insertion part. b. A lower roller having a concave shape that is the same as that of the lower roller of the final group of the button insertion part forming part, and the approximately V-shaped button insertion part formed by the button insertion part forming part can be left as it is. A transfer section that transfers while maintaining its shape. c. A sealing material injection device that is disposed near the transfer section and injects a sealing material from above into the approximately V-shaped button insertion section. d. A seam folding section disposed downstream of the transfer section and comprising a plurality of sets of upper rollers and lower rollers for folding the substantially V-shaped button insertion section into the lower surface of the flat material. A duct folding machine characterized by having the above constituent requirements a to d.