JP4667972B2 - Film winding pipe - Google Patents

Description

The present invention relates to a film winding pipe for winding a film covered with a greenhouse, which is mainly used for ventilation of an agricultural and horticultural greenhouse.

In general, when the temperature in the greenhouse rises too much, wrap a part of the film covered by the greenhouse around the pipe body, wind up the film, introduce the outside air into the greenhouse, A method for adjusting the temperature has been proposed (see, for example, Patent Document 1).

In this construction method, a pipe body with the end of the film fixed is provided on the side surface of the greenhouse, a handle attached to the tip of the pipe body is rotated, and the film is wound around the outer periphery of the pipe body. It is something to roll up. Since the side wall surface of a greenhouse usually ranges from several tens to one hundred meters, the pipe body is generally formed by connecting a plurality of pipe units. When the handle is rotated, the connected pipe units rotate together. In addition, the end of the pipe unit is processed into an oval shape and these are connected.
No. 4-7725

However, since this method simply inserts the pipe unit, rainwater may enter the inside through the connection part through the film, and rainwater may enter the connection part due to freezing and expansion of the infiltrated rainwater, especially in winter. If it stays in the vicinity, loosening or disconnection of the connecting part may occur, and if rainwater stays inside the pipe unit, the pipe unit may swell or rupture in the vicinity. Maintenance such as draining of water is necessary, which may cause problems in terms of maintenance costs and workability. Further, if rainwater stays in the pipe unit for a long period of time, the pipe unit is bent by the weight, and rainwater tends to stay. Further, the pipe body may be bent due to the bending, and it may be difficult to wind up the film.

In order to solve these problems, a method of inserting a foam into the pipe unit has been proposed (see, for example, Patent Document 2).

In this method, even if rainwater that has entered the pipe unit freezes and expands in the winter due to the foam inserted inside the pipe unit, the expansion is absorbed by the foam, and the pipe connection is loosened. It is difficult for the pipe to come off and to swell and break.
JP 2000-96522 A

However, the above method has the following problems. That is, the construction is simple because the foam is only partially inserted into the pipe unit, but the intrusion of rainwater is not completely prevented by the gap formed between the foam and the inner wall of the pipe. Depending on the position of the foam, the rainwater may cause the connecting portion to loosen or come off, and the pipe to swell or break. In cold conditions, depending on the material of the foam, the flexibility is significantly reduced, the volume expansion during freezing of rainwater is not absorbed, the connection part may loosen or come off, and the pipe unit may swell or break. . If the foam is inserted over the entire length of the pipe unit, the above problems can be solved, but there is a problem in terms of workability and cost, and intrusion of rainwater from the gap formed between the foam and the pipe inner wall. Cannot be completely prevented.

The present invention eliminates the problems as described above, prevents the pipe unit from being swollen or broken, and provides a film winding pipe that can relatively easily wind up a film covered with a greenhouse. Is.

In order to achieve the above object, the present invention has the following configuration.
That is, the film winding pipe according to the present invention is provided with a horizontal pipe body formed by connecting a plurality of pipe units on the side surface of an agricultural and horticultural greenhouse, and is attached to one end of the pipe body. When the handle is rotated in a certain direction, the film covered with the greenhouse is wound around the outer periphery of the pipe body, and the film is wound up.
One end of the pipe unit is formed with an elliptically reduced projection, and the other end is formed with an elliptical receiving portion corresponding to the projection. Both pipe units are made to be connected by inserting a protrusion of another pipe unit adjacent to the section, and the protrusion and the receiving part are filled with a sealing material, and the protrusion and the receiving part are Intrusion of rainwater into the pipe unit is prevented,
Further, the sealing material filled in the projecting portion and the receiving portion is filled across the non-elliptical portion and the elliptical portion in the projecting portion and the receiving portion, and the non-elliptical portion and the elliptical portion are it is characterized in that the loss in boundary is prevented.

According to the present invention, since the connecting end of the pipe unit is sealed and rainwater does not enter the pipe unit, it is possible to prevent the pipe unit from being swollen or damaged due to freezing and expansion of the rainwater that has entered, particularly in winter. Furthermore, since rainwater does not enter the inside of the pipe unit, it is difficult for the pipe unit to bend due to its own weight, and the load of turning the handle when winding the film can be suppressed.

In the present invention, as a method of sealing the connection end of the pipe unit, if the connection end is sealed using foaming or a sealing material having elasticity even below freezing, flexibility is not lost even in cold conditions. If rainwater enters the area, the infiltrated rainwater is blocked by the sealing material and stays in the vicinity, and even if freezing and expansion occurs, the expansion volume is absorbed by the sealing material, so that the connection part is loosened or detached. Such problems are less likely to occur.

Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.

1 is a perspective view showing an embodiment of a film winding pipe of the present invention, FIG. 2 is a cross-sectional view showing a connection form of pipe units, FIG. 3 is a cross-sectional view of a connection part of the pipe unit, and FIG. 4 is a pipe unit. FIG. 5 is an enlarged sectional view of the receiving portion of the pipe unit.

In the drawing, a pipe body 1 is formed by connecting a plurality of pipe units 11, is provided horizontally on the side surface of an agricultural and horticultural greenhouse A substantially over its entire length, and a handle 2 is attached to one end portion. . When the handle 2 is moved upward together with the pipe body 1 while rotating the handle 2 in a certain direction, the film 3 covered with the greenhouse A is wound around the outer periphery of the pipe body 1 and the film 3 is wound up. The inside is ventilated.

Each pipe unit 11 is connected to another pipe unit 11 to form a connecting end portion constituting the connecting portion 12, and the connecting end portion has a protrusion 13 formed at one end portion of the pipe unit 11, that is, a long diameter. A protrusion 13 reduced in diameter to an ellipse smaller than the pipe diameter, and a receiving part 14 formed at the other end, that is, an elliptical receiving part 14 corresponding to the protruding part 13, and one pipe unit By inserting the protrusion 13 of the other pipe unit 11 adjacent to the receiving portion 14 of the eleventh, both the pipe units 11 are connected and the two pipe units 11 are rotated in conjunction with the rotation of the handle 3. Has been made.

Further, the elliptical root of the protrusion 13 is formed with a tapered portion 15 that is tapered, and is strongly connected by inserting the protrusion 13 up to the taber portion 15 against the tip of the receiving portion 14. Has been made. Note that the shapes of the protrusion 13 and the receiving portion 14 are not necessarily elliptical. When the film 2 is wound up by rotating the handle 2, the connected pipe unit 11 rotates in conjunction with the connecting portion 12. Any shape can be used as long as it is difficult to rotate freely.

The material of the pipe unit 11 is preferably a material that hardly corrodes even when installed outdoors, such as aluminum, galvanized steel sheet, alloy-plated steel sheet, and stainless steel.

In addition, in this embodiment, the pipe unit 11 is covered with a covering material 16 in order to improve the corrosion resistance. The covering material 16 is not particularly limited, but a resin that can cover the pipe unit 11 with an extruder such as an olefin resin is preferable. As the olefin-based resin, an α-olefin polymer such as ethylene, propylene, and butene may be used alone, or an α-olefin copolymerized with ethylene may be used, and adhesion to a pipe may be used. For the purpose of improvement, ethylene is copolymerized with vinyl acetate, methacrylic acid or its ester, acrylic acid or its ester, ethylene is copolymerized with maleic anhydride, polyethylene end is modified with maleic anhydride, etc. May be used.

When the pipe unit 11 is covered with the covering material 16, the protrusion 13 side should not cover the protrusion 13 and the taper portion 15 inserted into the receiving portion 14. If this part is covered, when the protrusion 13 is inserted into the receiving part 14, even if the protrusion 13 is pushed hard, the covering material 16 is merely deformed, and sufficient connection strength does not occur, and the connection part is loosened or detached. It may cause.

The receiving portion 14 side is preferably provided with a covering material 16 extending from its tip, and the extending portion 17 is preferably covered with the covering material 16 of the other pipe unit 11 adjacent thereto. If it does in this way, since the site | part of the pipe | texture surface of the protrusion 14 in the other adjacent pipe unit 11 is concealed from the outside, and rainwater does not enter easily, when the pipe unit 11 consists of metal, the site | part Corrosion of is suppressed.

Further, the connecting end portion of the pipe unit 11, that is, the protruding portion 13 and the receiving portion 14 are sealed to prevent rainwater from entering the pipe unit 11 from the protruding portion 13 and the receiving portion 14. Although this sealing method is not particularly limited, in the present embodiment, with respect to the protruding portion 13 side, the sealing material 18 extends from the tip to the predetermined position of the portion that is not reduced in the elliptical shape beyond the tapered portion 15. It is filled from the position deeper than the length of the protrusion to a non-elliptical part so that there is still some space 19 from the tip of the inserted protrusion 13 on the receiving part 14 side. . In this way, it becomes difficult for the sealing material 18 to easily come off due to the resistance generated at the boundary between the non-elliptical part and the elliptical part. In addition, since rainwater does not enter the inside of the pipe unit 11, it is difficult for the pipe unit 11 to bend due to its own weight, and the load of turning the handle 2 when the film 3 is wound up can be suppressed. It should be noted that the reason that the slight space portion 19 still exists from the tip of the protrusion 13 inserted into the receiving portion 14 is that the tip of the protrusion 13 does not hit the sealing material 18 filled in the receiving portion 14. This is to provide a slight margin.

If the sealing material 18 is foamed at the time of filling or thereafter, the flexibility of the sealing material 18 is improved and the pressure is strongly pressed against the inner surface of the pipe unit 11, so that rainwater is less likely to enter the inside of the pipe unit 11. preferable. Further, since the flexibility of the sealing material 18 is further improved, even if rainwater enters the connecting portion 12 between the connected protrusion 13 and the receiving portion 14 and the rainwater freezes and expands, bubbles due to foaming are generated. As a result, the volume expansion is more easily absorbed, and the connection portion 12 is less likely to loosen or come off. The foaming means of the sealing material 18 may be a foaming agent added to the sealing material 18 or may be gas foaming using gas. However, in order to prevent rainwater from entering the sealing agent 18, the foaming state is the direction of closed cells. Is more preferable.

Further, it is desirable that the sealing material 18 is a material having elasticity even below freezing point. For example, if a material such as polyurethane or silicon resin that has a glass transition temperature of minus several tens of degrees Celsius and does not lose flexibility even in cold conditions is used as the sealing material 18, the connecting portion 12 between the protrusion 13 and the receiving portion 14. Even when moisture enters the inside and freezing and expansion of the water occur, the volume expansion is absorbed and the connecting portion 12 is less likely to loosen or come off.

When the sealing material 18 is filled on the receiving portion 14 side, the sealing material 18 may be thinly attached to the inner wall surface of the receiving portion 14 to the extent that the insertion of the protrusion 13 is not hindered. In order to deposit the sealing material 18 thinly on the inner wall surface of the receiving portion 14, the sealing material 18 may be applied from the end by spraying or the like, or the end portion is filled with the sealing material 18, and then the protrusion 13 When removing the sealing material 18 filled in the insertion portion and removing the sealing material 18, the sealing material 18 may be removed from the inner wall surface by a predetermined thickness. In any case, when the sealing material 18 is thinly attached to the inner wall surface of the receiving portion 14, the protrusion 13 and the receiving portion 14 are strongly pressure-bonded via the sealing material 18, and the connecting portion 12 is loosened or detached. In addition, it becomes difficult to form a gap when the protrusion 13 is inserted into the receiving portion 14, and rainwater does not easily enter from the outside.

According to the present invention, for a long period of time, the occurrence of swelling and breakage of the pipe unit, the loosening and detachment of the connecting portion of the pipe unit, and the pipe body formed by connecting the pipe unit are also less likely to be bent. It can be suitably used as a member for winding a film covered with a greenhouse which is installed in a cold region and has a particularly long side.

It is a perspective view which shows one Embodiment of this invention film winding pipe. It is sectional drawing which shows the connection form of a pipe unit. It is sectional drawing of the connection part of a pipe unit. It is an expanded sectional view of the projection of a pipe unit. It is an expanded sectional view of the hollow part of a pipe unit.

DESCRIPTION OF SYMBOLS 1 Pipe main body 11 Pipe unit 12 Connection part 13 Protrusion part 14 Receiving part 15 Tapered part 16 Coating | covering material 17 Extension end part 18 Sealing material 19 Space part 2 Handle 3 Film A Plastic house

Claims (4)

A pipe body formed by connecting multiple pipe units to the side of a greenhouse for agricultural and horticultural purposes is installed horizontally, and when a handle attached to one end of the pipe body is rotated in a certain direction, vinyl A film winding pipe in which the film covered with the house is wound around the outer periphery of the pipe body, and the film is wound up,
One end of the pipe unit is formed with an elliptically reduced projection, and the other end is formed with an elliptical receiving portion corresponding to the projection. Both pipe units are made to be connected by inserting a protrusion of another pipe unit adjacent to the section, and the protrusion and the receiving part are filled with a sealing material, and the protrusion and the receiving part are Intrusion of rainwater into the pipe unit is prevented,
Further, the sealing material filled in the projecting portion and the receiving portion is filled across the non-elliptical portion and the elliptical portion in the projecting portion and the receiving portion, and the non-elliptical portion and the elliptical portion are film winding pipe, characterized in that the missing is prevented in the boundary. The pipe unit is covered with a resin coating material,
A tapered portion is formed on the elliptical root of the projection of the pipe unit, and the projection is inserted and connected to the tapered portion against the tip of the receiving portion of another adjacent pipe unit. Was made,
The film winding pipe according to claim 1, wherein the protrusion and the tapered portion inserted into the receiving portion of the adjacent pipe unit are not covered with a covering material.   3. The film winding pipe according to claim 1, wherein the sealing material is a foamed sealing material which is foamed at the time of filling or after filling. The film winding pipe according to any one of claims 1 to 3 , wherein the sealing material has elasticity even below freezing point .