JP2002225981A - Lid structure for tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a packing material for a tank lid stuck fast with a uniform pressure distribution to the entire circumference of the lid with the number of fastening positions lessened as compared with conventional ways by using an O-ring as the packing material for the tank lid. SOLUTION: The lid structure comprises a tank main body 1 having an opening 6 serving as a manhole at its upside and a double lid 10 composed of an inner lid 11 for closing the opening and an outer lid 12. The inner lid 11 is in a structure wherein the upper end of a circumferential raised side panel 4 rising from the inside plate 13 is curled toward the outside and downside, and the packing material 7 to be stuck fast from the lower opening-side 16 against the upper brim of the opening 6 of the tank main body 1 is fitted into the inside of the curled part 15. The outer lid 12 is put on to the inner lid 11 at the outside of the curled part 15 of the inner lid and fastened to the opening 6 with fastening devices 20 arranged at a plurality of intervals in equal angles in the circumferential direction of the opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank for storing and transporting liquid foodstuffs such as beverages and seasonings, industrial chemicals such as thinner, gasoline, oil and ink, and other various liquids. It relates to a lid structure.

[0002]

2. Description of the Related Art As a lid structure for such a tank, a lid as a manhole provided on an upper part of a tank body is provided with one lid connected by a hinge connecting portion. The lid is provided so as to be fastened to the mouth by fasteners arranged at equal intervals in the circumferential direction. Between the lid and the mouth, a packing material is mounted on one side to ensure a sealing property.

[0003] The above-mentioned packing material can be fitted in a concave groove formed in the mouth of the tank body, but in this case, it is not easy to wash the packing material mounting portion for repeated use. That is, when the tank is repeatedly used, not only the inside of the tank body but also the mounting portion of the packing material to which germs easily adhere must be carefully cleaned or disinfected, but the cleaning is troublesome. for that reason,
The packing material is often attached to the peripheral edge of the lid. For example, as shown in FIG. 6, a substantially concave section (52) having a downwardly open cross section is formed on the peripheral edge of the lid (51) made of a plate material. Then, a packing material (55) having a rectangular cross section is fitted into the inside of the concave portion (52), and this is fitted to the mouth (62) of the tank body (61).
In many cases, the structure is designed so as to be pressed against.

However, the above-mentioned square packing material (55) is relatively expensive and expensive.
In the case of a single lid, there is a possibility that dust or the like may enter when the lid is opened.

[0005] In addition, a fastener for fastening the lid to the mouth is composed of 1
Since the packing material is pressed against the mouth by fastening the two lids, good sealing properties cannot be secured unless the products are fastened with a substantially uniform pressure distribution over the entire circumference. Become.

That is, if the interval between the fastening positions in the circumferential direction is increased, the lid is slightly deformed, and the pressing force against the packing material becomes uneven in the circumferential direction, and becomes uniform over the entire circumference. Crimping cannot be performed due to pressure distribution.

For this reason, conventionally, fasteners for fastening the lid to the mouth are arranged at eight locations at regular intervals in the circumferential direction and are fastened at relatively small intervals. The work is troublesome. In addition, the number of fasteners increases the cost.

[0008] The present invention has been made in view of the above, and as a lid structure of this kind of tank, as a double lid structure of an inner lid and an outer lid, by making it possible to use an O-ring for the packing material, In order to solve the above problem, the packing material can be crimped with a uniform pressure distribution over the entire circumference at fewer fastening points than in the past.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a tank having a double lid structure comprising a tank body having a mouth as a manhole at the top, and an inner lid and an outer lid for closing the mouth. In the inner lid, an upper end portion of the rising peripheral side plate from the inner plate portion is wound outward and downward at a peripheral edge to form a concave shape, and the inside of the wound portion has a lower opening side. A packing material that is pressed against the upper end edge of the mouth of the tank body is fitted, and the outer lid is attached from the outer side of the winding part of the inner lid, and a plurality of the outer lids are provided at equal angular intervals in the circumferential direction. It is characterized by being provided so as to be able to be fastened to the above-mentioned mouth part by the fastener arranged in the place.

[0010] With this, in a state where the lid is attached to the mouth of the tank body, the fastening force of the fastener is transmitted to the inner lid via the outer lid and presses the packing material. Even if the pressing force over a wide range and the number of fastening points is smaller than in the past, the pressing force does not become uneven, and the packing material can be crimped with a substantially uniform pressure distribution over the entire circumference. In other words, reduce the number of fastening points,
A good sealing state can be secured.

In the above-mentioned lid structure, it is preferable that the winding portion has a substantially semicircular cross section and the outer circumference of the inner lid is a curved surface, so that the outer peripheral plate of the outer lid is close to the outer circumference of the inner lid. The opening and closing operation of the outer lid can be allowed.

It is preferable that the edge portion of the winding portion is slightly bent inward, and a packing material made of an O-ring is fitted into the inside of the winding portion. Cost can be reduced. Furthermore, fasteners for fastening the outer lid to the mouth can be provided at four locations at equal intervals in the circumferential direction, thereby reducing the number of operations required for the fastening operation.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the embodiments shown in the drawings.

FIG. 1 is a partially cut-away side view of a tank (A) according to the present invention, FIG. 2 is a cross-sectional view of the tank opening with a lid attached, FIG. 3 is a plan view of an outer lid, FIG. 5 is an enlarged sectional view of a part before and after the lid is attached.

In the figure, (1) is a tank main body made of a material having appropriate strength and rigidity such as a metal material such as stainless steel or a plastic material, and as shown in the figure, a reinforcing outer frame (2). Supported by A discharge pipe (5) having a valve (4) for opening and closing at the center of the bottom (3) is connected to the lower part of the tank body (1) as a discharge port. The outlet may be provided at the periphery of the bottom or at the lower end of the side wall. (6) is a mouth portion as a thick-walled cylindrical manhole provided on the upper portion of the tank body (1), and the mouth portion (6) has a double lid comprising an inner lid (11) and an outer lid (12). (10) is provided to be openable and closable.

The inner lid (11) is formed integrally from a single metal plate material by means of drawing or pressing, and has an inner plate which can be fitted into the inside of the mouth (6) at the periphery. A rising peripheral side plate (14) that is bent substantially vertically from the portion (13) and rises, and an upper end of the rising peripheral side plate (14) is wound in a semicircular shape outward and downward to open downward; The inner cover (11) has a rounded curved surface on the outer periphery of the inner lid (11). And this winding part (15)
A packing material (7) made of an O-ring or the like having a circular cross section, which is pressed against the upper edge of the mouth (6) of the tank body (1) from the side of the lower opening (16). It is fitted and held slightly exposed from the opening (16). In the case of the figure, the edge portion (15a) of the winding portion (15)
Is slightly bent inward, and a packing material (7) formed of an O-ring is fitted and held inside the winding portion (15) so as not to be easily removed.

As the packing material (7), the O-ring having a circular cross section as described above can be manufactured more easily and at lower cost than a packing material having a substantially square cross section.
Although it can be particularly preferably used, it is also possible to use a packing material having a substantially square cross section (not shown). In this case, the winding part (15) is wound into a square shape, and its edge is bent slightly inward to open downward, and a packing material is fitted and held inside the winding part. Let it.

The packing material (7) is replaced by removing the packing material of the winding part (15) from the opening part (16) using a tool such as a screwdriver, or by removing the packing material from the opening part (16). What is necessary is just to make it fit using elasticity, and it is easy.

The outer lid (12) is formed from a single metal plate by means such as drawing or pressing, and is covered on the outside of the winding part (15) of the inner lid (11). It has a generally recessed cross-section that can be fitted, and is supported by being hingedly connected to an opening (6) by a hinge connecting part (8) at a part of its peripheral edge. In particular, since the outer periphery of the inner cover (11) is a curved surface, even when the outer peripheral plate (12a) of the outer cover is close to the outer periphery of the inner cover (11) as shown in FIG.
2) The opening and closing operation can be performed without any problem. (9) is a handle for opening and closing operation.

The outer lid (12) is provided so as to be able to be fastened to the mouth (6) by fasteners (20) such as bolts and nuts arranged at a plurality of positions at equal angular intervals in the circumferential direction.
By this fastening, the packing material (7) provided on the peripheral edge of the inner lid (11) can be pressed against the upper edge of the mouth (6).

As a fastening structure using the fastener (20),
In the case of the illustrated embodiment, fastening bolts (21) which are supported so as to be able to stand upright are provided at a plurality of positions, particularly preferably at four positions, at equal angular intervals in the circumferential direction on the outer peripheral surface of the mouth (6), while the outer lid ( The fastening bolt (2
An engagement plate (23) having a slit (22) for engagement at an outwardly protruding portion is provided by welding means at a position corresponding to 1), and an engagement plate with the fastening bolt (21) raised is provided. It is provided so that it can be fastened by a tightening nut (24) such as a wing nut or an eye nut while being fitted in the slit (22) of (23).

According to the tank (A) of the above-mentioned embodiment, the inner lid is attached to the mouth (6) with the liquid such as food or medicine to be transported and stored in the tank body (1). (11)
The double lid (10) made of (12) is covered and kept in a sealed state. That is, the inner plate portion (13) of the inner lid (11) is fitted into the mouth portion (6) on the mouth portion (6) of the tank body (1), and the winding portion (15) on the peripheral portion is formed. The packing material (7) fitted and held inside is brought into contact with the upper end edge of the opening (6) from the lower opening (16), and in this state, the packing material (7) is placed outside the inner lid (11). The cover (12) is covered and fastened to the mouth (6) by fasteners (20) arranged at a plurality of positions, for example, four positions at equal accuracy intervals in the circumferential direction.

By the fastening of the outer lid (12), the packing material (7) arranged on the peripheral edge of the inner lid (11) is pressed against the upper edge of the mouth (6). In particular, the fastening force of the fastener (20) is transmitted over a wider range from the lower surface to the upper surface of the inner lid (11) through the plate material forming the outer lid (12), and the inner lid (11) is formed. Since the packing material (7) is pressed by the plate material to be formed, the pressing force on the packing material (7) extends over a wide range. Therefore, even if the number of fastening points is smaller than in the past, for example, only four as shown in the figure, the pressing force does not become non-uniform, and the packing material (7) is extended all around the mouth (6). Can be pressure-bonded with a substantially uniform pressure distribution over a period of time, and predetermined airtightness can be secured.

Further, since the number of fastening points by the fastener (20) is reduced, the fastening operation and the loosening operation in use can be easily performed, and for example, the mouth can be opened and closed in about half the conventional time. In addition, because the number of use of this fastener (20) is small,
This also reduces the costs involved.

Further, since the inner lid (11) and the outer lid (12) are double lids (10), there is no danger of dust entering the tank when the outer lid (12) is opened. Further, since the packing material (7) is mounted on the inner lid (11), in the cleaning for repeated use, only the inner lid (11) needs to be cleaned with the tank body (1). ), And can be easily washed separately from the tank body (1) and the outer lid (12), and can be easily immersed in a disinfecting solution.

[0026]

As described above, according to the present invention, a double lid structure of an inner lid and an outer lid is used as a lid structure of a tank used for transporting various liquids and the like. By providing packing material and fastening the outer lid to the mouth,
By compressing the packing material to the upper end edge of the mouth, the packing material can be pressure-bonded with a uniform pressure distribution over the entire circumference with a smaller number of fasteners than conventional, for example, about 1/2 fastener. Good airtightness in the state can be maintained.

In addition, since the number of fasteners is small, the manhole can be easily opened and closed to open and close the mouth, and the work can be easily performed and the cost can be reduced. Further, washing for repeated use becomes easy.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a tank according to the present invention.

FIG. 2 is a cross-sectional view showing a state where the lid of the tank opening is attached to the tank.

FIG. 3 is a plan view of the outer lid according to the first embodiment;

FIG. 4 is an enlarged cross-sectional view of a part before the lid is attached.

FIG. 5 is an enlarged sectional view of a part of the above-mentioned lid-mounted state.

FIG. 6 is an enlarged sectional view of a part of a lid structure in a conventional tank opening.

[Explanation of symbols]

 (A) Tank (1) Tank body (6) Manhole opening (7) Packing material (8) Hinge connection (10) Double lid (11) Inner lid (12) Outer lid (12a) Outer plate (13) Inner plate part (14) Rising peripheral side plate (15) Winding part (16) Lower opening part (20) Fastener (21) Fastening bolt (23) Engagement plate (24) Tightening nut

Claims (4)

[Claims] 1. A tank having a double lid structure comprising a tank body having a mouth as a manhole at an upper part thereof, and an inner lid and an outer lid for closing the mouth, wherein the inner lid has an inner periphery at an inner periphery. The upper end of the peripheral side plate rising from the plate portion is wound outward and downward to form a concave and concave shape, and is crimped inside the wound portion from the lower opening side to the upper end edge of the mouth of the tank body. The outer lid is attached to the outside of the winding part of the inner lid, and is fastened to the mouth by fasteners arranged at a plurality of positions at equal angular intervals in the circumferential direction. A tank lid structure characterized by being provided as possible. 2. The tank lid structure according to claim 1, wherein the winding portion has a substantially semicircular cross section, and the outer circumference of the inner lid is a curved surface. 3. The tank according to claim 1, wherein an edge portion of the winding portion is slightly bent inward, and a packing material made of an O-ring is fitted inside the winding portion. Lid structure. 4. The tank lid structure according to claim 1, wherein fasteners for fastening the outer lid to the mouth are arranged at four locations at equal intervals in a circumferential direction.