JPH10165009A - Resin film construct with automatic opening and closing mechanism or resin film member with automatic opening and closing mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost resin film construct with an automatic opening / closing mechanism which has good workability, does not damage agricultural crops, and is low in cost. SOLUTION: In a resin film construction comprising a plurality of pillars and a resin film constituting a closed space by supporting the pillars, a slit 11 is provided at a required portion of the resin film 10, and at least one peripheral edge of the slit 11 is provided. Actuator 20 that reversibly deforms in response to changes in ambient temperature
A resin film structure with an automatic opening and closing mechanism that automatically opens and closes the slit 11 [Effect] A slit 11 is formed in the resin film 10 of the resin film construct, and the slit 11 is opened and closed by the actuator 20 for ventilation, so that the excess resin film does not hang down and impair workability, and strong wind from the hem. The agricultural products are not damaged due to blowing, and the actuator 20 is small and inexpensive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin film structure with an automatic opening / closing mechanism which has good workability and does not damage agricultural products, and which can be easily cut and attached to the resin film structure. The present invention relates to a resin film member provided with.

[0002]

2. Description of the Related Art Conventionally, a field has been widely covered with a resin film structure in order to promote the growth of agricultural crops and to prevent frost damage and freezing due to cooling in winter. As shown in FIG. 9, the resin film construct includes a plurality of arc-shaped frames 41 (posts) standing on the ground,
It consists of the resin film 10 constituting a closed space with the arc-shaped frame 41 as a support. Usually, polyvinyl chloride, polyethylene, or the like is used for the resin film.

[0003] By the way, in such a resin film construction, on a sunny day, the temperature inside may rise more than necessary, and the crops may wilt. For this reason, the farm worker has manually opened and closed the hem of the resin film structure in accordance with weather conditions such as sunshine and temperature to adjust the temperature inside the structure. However, since such labor becomes a considerable burden as the agricultural workers are aging, a circular or square opening is provided in the resin film, and a shape memory alloy member is attached to the inner peripheral edge of the opening, and the resin film is formed. A construction has been proposed in which the opening is opened when the temperature inside the film construction becomes high (Japanese Patent Laid-Open No. 3-56348).
However, in this construction, when the opening is opened, the excess resin film hangs down in the construction and impairs workability,
Further, there is a problem that the shape memory alloy member becomes large due to a long moving distance of the resin film when opening the opening.
In view of this, a resin film construction in which the hem is automatically opened and closed by a shape memory alloy member has been proposed (Japanese Utility Model Application Laid-Open No. Hei 5 (1993) -122).
-80248, JP-A-6-141698).

[0004]

However, in order to automatically open and close the hem of the resin film structure, an expensive and large shape memory alloy spring is required, and strong wind blows from the hem, There is a problem that rainwater flows in and crops are damaged. The purpose of the present invention is to prevent the excess resin film from sagging, not to damage the crops by strong wind or heavy rain,
It is an object of the present invention to provide a resin film structure with an automatic opening / closing mechanism having a small actuator and a low cost, or a resin film member with an automatic opening / closing mechanism that can be easily cut into the resin film structure.

[0005]

According to the first aspect of the present invention,
In a resin film construct consisting of a plurality of pillars and a resin film constituting a closed space with the pillars as supports,
A slit is provided at a required portion of the resin film, and an actuator that reversibly deforms in accordance with a change in ambient temperature is attached to at least one peripheral edge of the slit, and the slit is automatically opened and closed. It is a resin film construct with an opening and closing mechanism.

According to a second aspect of the present invention, there is provided the resin film assembly with an automatic opening / closing mechanism according to the first aspect, wherein a cover for covering the slit is attached to an outer portion of the slit.

According to a third aspect of the present invention, a slit is provided at a required portion of the resin film, and an actuator which is reversibly deformed in response to a change in ambient temperature is attached to at least one peripheral edge of the slit, and the slit is automatically turned on. It is a resin film member with an automatic opening / closing mechanism, which is characterized by being opened and closed.

According to a fourth aspect of the present invention, the ends of the two resin films are overlapped, both ends of the overlapped portion are joined, and a change in the ambient temperature is applied to the periphery of at least one of the central non-joined resin films. A resin film member with an automatic opening / closing mechanism, characterized in that an actuator that reversibly deforms in accordance with the condition is mounted to automatically open and close the non-joined portion.

According to a fifth aspect of the present invention, there is provided a resin film construct comprising a plurality of columns and a resin film forming a closed space by supporting the columns, wherein a required portion of the resin film is provided. Characterized in that the resin member with an automatic opening / closing mechanism is cut and stretched.

According to a sixth aspect of the present invention, there is provided a resin film assembly with an automatic opening / closing mechanism according to any one of the first to second aspects, wherein the actuator comprises a shape memory alloy member and a bias member. .

The invention according to claim 7 is the resin film member with an automatic opening / closing mechanism according to claim 3 or 4, wherein the actuator comprises a shape memory alloy member and a bias member.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In the resin film structure of the present invention, the position of the slit or the non-joined portion (the position where the automatic opening / closing resin film member is cut) is determined on the side surface of the resin film structure, particularly, on the mutually adjacent frames. It is desirable that the position is approximately in the middle of the above. The direction of the slit or the non-joined portion is basically horizontal, but is not particularly limited. The length is preferably about 100 to 200 mm, and the interval is preferably about several tens of cm.

[0013] A slit or a non-joining portion is provided sideways,
When the actuator is mounted on the upper inner peripheral edge of the slit or the non-joined portion so as to be bent outward, or is mounted on the lower inner peripheral edge so as to be bent inwardly, the slit or the non-joined portion opens downward and the rainwater Prevents intrusion. When the actuator is mounted so as to open upward, hot air in the resin film structure is easily released.

In the present invention, it is desirable to use a combination of a shape memory alloy member and a bias member for the actuator because the temperature can be reliably set. It is desirable to use a coil spring for the shape memory alloy member and to use a leaf spring for the bias member because the actuator can be reduced in size and excellent in repeated durability. The upper limit of the slit opening temperature is 32 ℃,
When the lower limit of the closing temperature is set to 18 ° C., the growth of the crop can be promoted and the crop can be prevented from withering.

In the present invention, since the slit or the overlapping portion of the two resin films is opened and closed, the excess resin film does not hang down in the resin film structure to impair workability, and the hem is not opened and closed, so that strong winds are not generated. It is hardly damaged by the above, and can be opened and closed with a small actuator, and is inexpensive.

Hereinafter, the opening / closing mechanism of the slit or non-joined portion of the resin film structure of the present invention will be specifically described with reference to the drawings. 1A and 1B are a front view and a side view showing a first example of a slit portion of the resin film structure of the present invention. FIG. 1A shows a state in which the slit is closed, and FIG. As shown in FIG. 1A, a slit 11 extending in the lateral direction is formed in the resin film 10.
And an actuator 20 that is reversibly deformed (bent) due to a change in ambient temperature is attached to the upper inner peripheral edge of the slit 11. As shown in FIG. 2, the actuator 20 has a shape memory alloy coil spring 24 fixed to both ends of a leaf spring 23 made of a SUS plate spring 23 and arranged along the leaf spring 23.
Is adhered to the upper inner peripheral edge of the slit 11. The shape of the coil spring 24 is stored in a compressed state. When the ambient temperature rises, the shape memory alloy coil spring 24 shortens and SU
The S-made leaf spring 23 bends outward. When the ambient temperature rises, as shown in FIG. 1 (b), the actuator 20 bends outward, and the slit 11 of the resin film 10 opens downward. When the temperature decreases, the shape memory alloy coil spring softens and returns to its original linear shape by the restoring force of the SUS leaf spring, and the slit 11 closes as shown in FIG.

FIGS. 3A and 3B are a front view and a side view showing a second example of the slit 11 portion of the resin film structure of the present invention. FIG. 3A shows a state in which the slit is closed, and FIG. Slit 11
A cover 25 that covers the slit 11 is attached to the outer peripheral edge of the upper side, and the cover 25 prevents intrusion of rainwater.

In the present invention, a slit is provided at a required portion of the resin film, and an actuator which is reversibly deformed in accordance with a change in ambient temperature is attached to at least one peripheral edge of the slit, and the slit is automatically opened and closed. The resin film member with an automatic opening / closing mechanism, which is characterized by being cut into a resin film structure, can be manufactured.

FIG. 4A is a front view and a side view showing another example of such a resin film member having an automatic opening / closing mechanism.
Attach the ends of the resin films 33 and 34
The two ends of the overlapped part are joined together, and the actuator 20 is attached to the upper inner peripheral edge of the central non-joined part 35.
Is installed. When the ambient temperature rises, as shown in FIG. 4B, the actuator 20 bends outward, and the non-joined portion 35 opens downward. When the temperature drops, the shape memory alloy coil spring softens and returns to its original linear shape due to the restoring force of the leaf spring.
Close as shown in (a).

FIG. 5 (a) is a front view and a side view showing another example of the resin film member with an automatic opening / closing mechanism of the present invention. The actuator 20 has an inwardly bent lower inner peripheral edge of the non-joined portion 35. When the ambient temperature rises,
As shown in FIG. 5B, the non-joined portion 35 opens downward.

In the resin film structure of the present invention or the resin film member with an automatic opening / closing mechanism, the actuator can be attached to both the upper and lower peripheral edges of the slit or the non-joined portion to make the opening larger. When a thick resin film is used, the mounting of the actuator is firmly performed. The resin film member is, in addition to polyethylene and polyvinyl chloride, polypropylene, nylon, polyvinylidene chloride, polybutadiene, etc. Can be used.

FIG. 6 is an explanatory view showing a second example of the actuator used in the present invention. This actuator 21
A shape memory alloy plate 26 having a curved shape stored in close contact with a SUS leaf spring 23 is used in the same manner as the actuator 20 shown in FIG.

FIG. 7 is an explanatory view showing a third example of the actuator used in the present invention. This actuator 22
A slide plate 28 is slidably connected to the fixed substrate 27 by a connecting plate 29, and the SU is moved to the resin film 34 side via the connecting plate 29.
An S-made coil spring (bias spring) 30 is provided, and a shape memory alloy coil spring 24 that has a shape memory in an extended state on the other side (the inside of the resin film structure) is provided. The actuator 22 is usually used by attaching one end of a fixed substrate 27 to the upper inner peripheral edge of the resin film 33 and attaching one end of the slide plate 28 to the lower inner peripheral edge of the resin film 34. When the temperature rises, the shape memory alloy coil spring 24 is in an expanded state, and the non-joined portion 35 opens downward. When the temperature drops, the coil spring 24 softens and is pushed by the SUS coil spring 30 to move the slide plate 28 relative to the fixed substrate 27, thereby closing the non-joined portion 35.

[0024]

The present invention will be described below in detail with reference to examples. (Example 1) Two hard films having a width of 200 mm, a length of 110 mm, and a thickness of 0.5 mm were overlapped with their ends overlapped by 10 mm.
A non-joined part having a width of 10 mm and a width of 10 mm was formed. The actuator shown in FIG. 2 was attached to the upper inner peripheral edge of the non-joined portion to produce a resin film member with an automatic opening / closing mechanism. The shape memory alloy coil spring of the actuator has a wire diameter of 0.75 mm, a coil diameter of 7 mm, a number of turns of 20 and both ends are formed into an inverted round shape at 50.5 at% N.
i-49.5at% Ti alloy was used. As the bias spring, a SUS plate spring having a thickness of 0.2 mm, a width of 7 mm, and a length of 110 mm was used. The opening / closing temperature of the resin film member having the automatic opening / closing mechanism was examined using a thermostat. As a result, the slit opens 30mm at 25 ° C,
It was confirmed that the slit closed at 0 ° C.

(Embodiment 2) Next, as shown in FIG. 8, a resin film 10 is put on six arc-shaped frames 41 planted at predetermined intervals to assemble a resin film construct. A total of 10 small windows are cut out on both sides of the resin film 10 at an intermediate position of the adjacent arc-shaped frame 41 of the construct, and the resin film member 42 with the automatic opening / closing mechanism made in Example 1 is attached to the small windows. Thus, a resin film construct 43 with an automatic opening / closing mechanism was produced.

The temperature in the resin film structure was measured from 7:00 am on a sunny winter day to 6:00 am on the following day.
Similar measurements were made on a conventional resin film construction without an automatic ventilator. Figure 10 shows the results together with the outside air temperature.
Shown in As is clear from FIG. 10, the temperature inside the resin film construct reached 25 ° C. at 10 am In the resin film construct of the present invention, the shape memory alloy coil spring is operated to open the overlapping portion, and the resin film construct within the day is 23 to
It was kept at a temperature of 25 ° C. When the temperature inside the resin film structure dropped to 20 ° C. at 17:00, the slit was closed, and the temperature inside the resin film structure was kept at 10 to 12 ° C. until 6:00 the next morning. On the other hand, in the conventional resin film construct,
The temperature inside the resin film construct continued to rise and reached 42 ° C. at 3:00 pm. As a result, the crops in the resin film construction almost wilted and suffered a great deal of damage.

(Example 3) A slit having a length of 150 mm is formed at an intermediate position between adjacent frames of the resin film structure shown in FIG. 9, and an actuator is formed on the upper inner peripheral edge of the slit as shown in FIG. Was installed. A rain cover was attached to the outside of the slit as shown in FIG. The actuator shown in FIG. 2 was used. When the temperature inside the resin film structure was measured in the same manner as in Example 2, the same effects as in Example 2 were obtained. There was no rainwater intrusion.

The case where the actuator shown in FIG. 2 is used has been described above. However, in the present invention, the same effect can be obtained by using the actuator shown in FIGS.
Further, the resin film structure and the resin film member with the automatic opening / closing mechanism of the present invention are useful not only for agricultural structures, but also for simple warehouses and tents, etc. It is.

[0029]

As described above, in the structure of the present invention, the slit is formed in the resin film of the structure, and the slit is automatically opened and closed by the actuator for ventilation, so that the excess resin film hangs down. The workability is not impaired, the crops are not damaged by blowing strong wind, etc.
Moreover, the actuator is small and inexpensive. By attaching a cover to the outside of the slit, intrusion of rainwater from the slit can be prevented. Further, the resin film member of the present invention can easily ventilate the building by cutting it into an existing building. The opening / closing temperature can be appropriately set by using a shape memory alloy member for the actuator.

[Brief description of the drawings]

FIGS. 1A and 1B are a front view and a side view showing a first example of a slit portion of a resin film structure of the present invention. FIG. 1A shows a state in which the slit is closed, and FIG.

FIGS. 2A and 2B are explanatory diagrams showing a first example of an actuator used in the present invention. FIG. 2A shows a linear state, and FIG. 2B shows a curved state.

FIGS. 3A and 3B are a front view and a side view showing a second example of a slit portion of the resin film structure of the present invention. FIG. 3A shows a state in which the slit is closed, and FIG.

FIGS. 4A and 4B are a front view and a side view showing a first example of a resin film member with an automatic opening / closing mechanism according to the present invention. FIG. 4A shows a state in which the overlapping portion is closed, and FIG. Show.

5A and 5B are a front view and a side view showing a second example of the resin film member with an automatic opening / closing mechanism of the present invention. FIG. 5A shows a state in which the overlapping portion is closed, and FIG. Show.

FIGS. 6A and 6B are explanatory diagrams showing a second example of the actuator used in the present invention. FIG. 6A shows a linear state, and FIG. 6B shows a curved state.

7A and 7B are explanatory views showing a third example of the actuator used in the present invention. FIG. 7A shows a state in which the overlapping portion is closed, and FIG. 7B shows a state in which the overlapping portion is opened.

FIG. 8 is a perspective view showing an example of the resin film structure of the present invention.

FIG. 9 is a perspective view of a conventional resin film construction.

FIG. 10 is a diagram showing a change with time of the internal temperature of the resin film construct of the present invention.

[Explanation of symbols]

 10 Resin film constituting resin film construct 11 Slit 20-22 Actuator 23 SUS leaf spring 24 Shape memory alloy coil spring 25 Cover covering slit 26 Shape memory alloy plate 27 Fixed substrate 28 Slide plate 29 Connecting substrate 30 SUS Coil spring 33,34 Resin film 35 Non-joined part 41 Arc-shaped frame 42 Resin film member with automatic opening and closing mechanism 43 Resin film structure with automatic opening and closing mechanism

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kengo Mitose 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd.

Claims (7)

[Claims] 1. A resin film construct comprising a plurality of pillars and a resin film forming a closed space with the pillars as supports, wherein a slit is provided at a required portion of the resin film, and a slit is formed on at least one peripheral edge of the slit. A resin film assembly with an automatic opening / closing mechanism, wherein an actuator that reversibly deforms in response to a change in ambient temperature is attached and the slit is automatically opened and closed. 2. The resin film assembly with an automatic opening / closing mechanism according to claim 1, wherein a cover for covering the slit is attached to an outer portion of the slit. 3. A slit is provided at a required portion of the resin film, and an actuator which is reversibly deformed according to a change in ambient temperature is attached to at least one peripheral edge of the slit to automatically open and close the slit. Characteristic resin film member with automatic opening and closing mechanism. 4. An end portion of the two resin films is overlapped, both ends of the overlapped portion are joined, and the periphery of at least one resin film at the central non-joined portion is reversibly reversible according to a change in ambient temperature. A resin film member with an automatic opening / closing mechanism, wherein the non-joined portion is automatically opened / closed by attaching a deformable actuator. 5. A resin film construct comprising a plurality of columns and a resin film forming a closed space with the columns as supports, wherein the resin film is formed at a required portion of the resin film.
Or a resin film construct with an automatic opening / closing mechanism, wherein the resin member with an automatic opening / closing mechanism according to 4 is stretched. 6. The actuator according to claim 1, wherein the actuator comprises a shape memory alloy member and a bias member.
The resin film construct with an automatic opening / closing mechanism according to any one of the above. 7. The actuator according to claim 3, wherein the actuator comprises a shape memory alloy member and a bias member.
A resin film member with an automatic opening / closing mechanism according to item 1.