JP2007137458A - Dustproof cover for cement container or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dustproof cover which effectively prevents scattering of dust when cement from a flexible container containing the cement is charged into a mixer, etc. <P>SOLUTION: The dustproof cover includes a cylindrical trunk which is put over a baglike flexible container containing powdered cement, etc., and a lid plate which covers the upper end of the trunk. At the center of the lid plate, a through-hole is provided to put a hanging string attached to the flexible container through the through-hole, the periphery of which has an upward projecting collar. Pulling and tightening the string disposed around the collar enable the squeeze of an opening. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dustproof cover for preventing dust from being scattered, for example, when cement is poured into a mixer or the like from a flexible container containing cement.

  In the field of civil engineering and construction, for example, a flexible container containing 1 ton of cement is carried into a construction site by a truck or the like and kneaded by a mixer installed on the site. The upper opening of the flexible container is closed by tightening with a string, and the string can be hung by hanging a hook of a crane. A cement hopper is provided at the top of the mixer, and a cutter for tearing the flexible container is attached to the opening of the hopper, so when the flexible container lifted by a crane or the like is lowered onto the hopper The bottom of the flexible container is cut by the cutter, and the cement inside flows down into the hopper. An example of this type of flexible container bag opening machine is disclosed in Patent Document 1.

JP-A-6-329135

  When cement is transferred from the flexible container containing the cement to the hopper of the mixer, a large amount of dust is generated. However, this dust is scattered around and causes pollution problems such as adversely affecting neighboring houses. In recent civil engineering and the like, this pollution problem has become a serious problem, and various measures have been taken to prevent it. Conventionally, the most commonly used dust-proofing method is a method of preventing dust scattering by surrounding the hopper and the container with a vinyl sheet or the like while the flexible container is carried on the hopper of the mixer.

  However, the method of enclosing the upper portion of the hopper with the vinyl sheet or the like has a problem that many people are required each time cement is put in, and the work efficiency is poor. Then, this invention makes it a subject to provide the dustproof device which can prevent scattering of dust simply and effectively, when transferring cement from a flexible container to a mixer etc.

  In order to solve the above problems, the present invention proposes a dust cover having the following configuration. That is, the dust-proof cover according to the present invention includes a cylindrical barrel portion that covers a bag-like flexible container that contains powder such as cement, and a lid plate portion that covers an upper end portion of the barrel portion, and the lid The center part of the plate part is provided with a through hole through which a string for suspension provided in the flexible container is inserted. It is preferable that a cylindrical collar projecting upward is provided around a through hole provided in the lid, and a string capable of narrowing the opening of the collar is provided on the collar. Further, if four cylinders are attached to the lower end portion of the trunk portion along the edge of the opening, and the lower portion of the trunk portion is formed so as to maintain a substantially square shape, a square hopper can be handled.

  This dust-proof cover is configured by a generally inverted cup-shaped cylinder covering the upper portion and the outer peripheral portion of the flexible container, and a small hole through which a hanging strap provided in the flexible container passes is provided at the upper portion. When this dustproof cover is put on the flexible container and the upper part of the hanging strap is pulled out from the small hole on the upper part, the flexible container covered with the dustproof cover can be hung with a crane or the like. On the other hand, since the lower part of the dustproof cover is open, when it is lowered onto the hopper of the mixer, the bottom of the container is cut with a cutter, and the cement is dropped into the hopper. At this time, dust is generated, but since the outer peripheral portion and upper portion of the container are surrounded by a cylindrical dust-proof cover, scattering of dust to the outside is prevented.

  Hereinafter, embodiments of the present invention will be specifically described. FIG. 1 shows one embodiment of a dustproof cover for a flexible container according to the present invention. This dustproof cover 1 is schematically provided with a cylindrical body portion 2 and a cover plate portion 3 that covers the upper end portion of the body portion. It is formed in a cup shape. The lower end part of the trunk | drum 2 is opening. A through-hole 5 for inserting a hanging strap is provided in the central portion of the lid plate portion 3, and a cylindrical collar 6 protruding upward is provided around the through-hole 5. In some cases, such a collar may not be provided, and only the small through hole 5 may be provided. However, in order to prevent dust from being scattered, it is more effective to provide the collar 6. As the dust cover 1, a sheet material flexible to some extent, for example, a polyvinyl chloride sheet called tarpaulin used for disaster prevention or the like can be suitably used.

  Reference numeral 7 in the figure denotes a thin frame made of, for example, a piano wire or the like, and frames 7 a and 7 b formed in a ring shape are attached to the upper edge and the lower edge of the dustproof cover 1. The upper and lower frames 7a and 7b are connected to each other by a vertical frame 7c provided at an appropriate interval. For this reason, the dustproof cover 1 made of a flexible sheet material maintains a cylindrical shape. Note that the vertical height of the dust cover 1 is set higher than the height of the flexible container. This is because the lower part of the dustproof cover surrounds the outer periphery of the opening of the hopper of the mixer when the flexible container is hung with a crane.

  As shown in FIG. 2, a plurality of round rings 9 are attached to the outer periphery of the collar 6 at appropriate intervals. By tightening the string 10 inserted into the round ring 9, the opening of the collar 6 is narrowed to prevent dust from being scattered. In addition, by narrowing the opening in this way, it is possible to prevent rainwater from flowing into the container or hopper during work on a rainy day. If the bottom of the hopper is a mixer that mixes water and cement, there is no problem even if rainwater flows in, but if the bottom of the hopper is a tank that temporarily stores cement, rainwater will flow in Since cement solidifies, it becomes a big problem. In this respect, if the opening can be narrowed as described above, there is an advantage that the inflow of rainwater can be effectively prevented even during work in rainy weather.

  The dust cover 1 is used as shown in FIGS. That is, the suspension string 21 that squeezes the upper opening of the flexible container 20 filled with cement is passed through the through-hole of the collar 6 and the dust-proof cover 1 is put on the flexible container 20. In this state, a slight gap exists between the inner surface of the dustproof cover 1 and the outer peripheral portion of the flexible container 20. The flexible container 20 shown in FIG. 3 is formed as a round cement bag, but there is also a square container. Even if the flexible container is rectangular, it can be sufficiently applied if the dust cover 1 is formed larger than the outer shape of the flexible container. In addition, the adaptability with respect to a square-shaped flexible container improves by forming a dust-proof cover with a flexible sheet | seat material.

  Next, as shown in FIG. 4, the hook 31 of the crane 30 is hooked on the hanging strap 21 protruding above the dustproof cover 1, and the flexible container 20 is lifted together with the dustproof cover 1 and conveyed to above the mixer 40. Since the cover 1 is covered with a flexible container and the diameter of the opening 5 is smaller than the outer diameter of the flexible container, there is no possibility that the dust-proof cover 1 will come off the flexible container and fall. After being carried on the hopper 41 of the mixer 40, the flexible container 20 is gradually lowered. As shown in FIG. 5, the hopper 41 of the mixer 40 is provided with a cutter 42 that is pointed upward. When the flexible container 20 is further lowered, the bottom of the flexible container 20 is cut by the cutter, Internal cement flows into the hopper. At this time, dust is inevitably generated, but since the lower portion of the dust-proof cover 1 surrounds the outer periphery of the hopper 41, most of the generated dust stays in the dust-proof cover and is scattered outside. It is prevented.

  When the cement in the flexible container 20 is moved into the hopper 41 of the mixer, the empty flexible container 20 and the dustproof cover 1 are lifted and transported to an unobstructed place, the flexible container is removed from the crane, and the dustproof cover 1 is removed. What is necessary is just to remove from the said flexible container. Note that the dust-proof cover can be lifted while being supported by the empty flexible container by appropriately reducing the inner diameter of the collar 6. However, as described above, the opening 5 of the collar 6 is formed into a circular ring. If it is squeezed with a threaded string, the dust cover can be prevented from being separated and dropped more reliably.

  Next, FIG. 7 shows an embodiment slightly different from the above, and the dustproof cover 1 ′ of this embodiment is adapted to be compatible with a rectangular flexible container or a rectangular hopper. This dust-proof cover 1 'has the same overall structure as that of the above-described embodiment, except that four cylinders 50 are attached to the lower edge portion of the body portion at equal intervals. The cylinder 50 is a lightweight pipe having a certain degree of rigidity, and for example, a plastic pipe such as polyvinyl chloride can be adopted. The material of the cylinder is not limited to this, and may be a metal pipe such as aluminum.

  Since the four cylinders 50 are attached at equal intervals to the lower end opening of the body portion 2 of the dustproof cover 1 ′, the lower end opening of the dustproof cover is kept substantially rectangular. In addition, in the space | interval part 51 between cylinders, the trunk | drum 2 exhibits a cross-sectional arc shape. A string 52 is inserted through the four tubes 50, and both ends of the string 52 are inserted into a fastener 55. The fastener 55 is a known string fixing tool having a tooth row that engages with the string, and pulls the end of the string 52 outward to squeeze the opening of the body part 2 to adjust the tension of the string. It can be fixed against. By pushing the protrusion 55a provided on the fastener 55, the engagement between the dentition and the string is released, the fixation of the string 52 is released, and the opening of the body part 2 is expanded.

  In this embodiment, a cylindrical portion 6a is formed through the upper edge portion of the collar 6 so that the string 57 is passed through the cylindrical portion, so that the opening of the collar 6 can be narrowed. It has become. 55 in the figure is a fastener similar to the above. Moreover, the ring-shaped thin frame 7 similar to the above-mentioned embodiment is attached to the upper edge portion of the trunk portion 2 so that the upper portion of the trunk portion 2 keeps a circular shape. Like the lower part, it can also be square.

  The usage of the dustproof cover 1 'is the same as that of the above embodiment, but in this embodiment, the lower end opening of the body portion 2 can be kept in a substantially rectangular shape, and thus the dustproof effect is enhanced by covering the rectangular hopper. be able to. In the illustrated example, the lower end opening is kept square by four cylinders, but it is possible to correspond to various polygonal hoppers by changing the number and arrangement of the cylinders.

  In the above description, the dust cover is formed of a sheet material such as a synthetic resin. However, in some cases, the dust cover may be formed by processing a metal plate into a cylindrical shape. However, if it is made of a flexible sheet material, it is not only lightweight, but it can be folded and placed when not in use, which is practically convenient.

  When transferring internal cement from a flexible container containing cement to a mixer, etc., it effectively prevents dust from being scattered to the outside and does not deteriorate the environment around the site. Suitable for use. In the above description, a cement bag or a flexible container for cement has been described. However, powders other than cement, for example, soda ash, alumina powder, fertilizer, raw materials for chemical factories, etc. Needless to say, the powder can be suitably used for dust prevention when the powder is taken out.

It is an external view of a dustproof cover. It is the side view (a) and front view (b) of a round ring. It is an external view showing the example of a flexible container. It is explanatory drawing of a suspended state. It is a top view of a mixer. It is a front view of a mixer. It is an external view of the dustproof cover in an embodiment different from the above.

Explanation of symbols

1,1 'dustproof cover 2 trunk 3 lid plate 5 through-hole 6 collar 7 frame 20 flexible container 40 mixer 41 hopper

Claims (4)

  A cylindrical body portion that covers a bag-like flexible container containing powder such as cement; and a lid plate portion that covers an upper end portion of the barrel portion. A flexible container is provided at a central portion of the lid plate portion. A dust-proof cover for cement or the like, characterized in that a through-hole is provided through which a hanging string provided on is attached.   The cement according to claim 1, wherein a cylindrical collar protruding upward is provided around a through-hole provided in the lid, and a string capable of narrowing an opening of the collar is provided on the collar. Dust cover.   The dust-proof cover for cement or the like according to claim 1 or 2, wherein four cylinders are attached to the lower end portion of the trunk portion along the opening edge portion, and the lower portion of the trunk portion is formed so as to maintain a substantially square shape.   The dust-proof cover for cement or the like according to claim 3, wherein a string is inserted into the four cylinders, and the opening of the trunk is narrowed by tightening the string.

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