CN113562347B

CN113562347B - Opening and closing mechanism for door of container and container having the same

Info

Publication number: CN113562347B
Application number: CN202011430635.7A
Authority: CN
Inventors: 增永路人
Original assignee: Boxtix Co ltd; Aichi Ken Ichi
Current assignee: Boxtix Co ltd; Aichi Ken Ichi
Priority date: 2020-04-28
Filing date: 2020-12-07
Publication date: 2023-01-10
Anticipated expiration: 2040-12-07
Also published as: JP7407061B2; JP2021172400A; CN113562347A

Abstract

The invention provides a door opening and closing mechanism which can prevent or inhibit the leakage of the transported objects, especially powder and granular materials, from the door of a container with extremely high probability and can safely load and store the transported objects, especially powder and granular materials. An opening/closing mechanism for powder and granular material according to the present invention is provided in an opening portion formed in at least 1 side wall of a container having a box-shaped upper wall, side walls, and a bottom wall, for opening or closing the opening portion, and is configured to have an outer door supported rotatably in the vertical direction at or near an upper end of the opening portion and an inner door spaced inward by a predetermined distance from the outer door and supported rotatably in the vertical direction at the bottom wall, the inner door being provided at a position where: when the inner door is rotated outward in a state where the outer door closes the opening, an upper end edge thereof abuts against an inner surface of the outer door.

Description

Opening and closing mechanism for door of container and container having the same

Technical Field

The present invention relates to a container.

More particularly, the present invention relates to a door opening/closing mechanism capable of safely loading and storing an object to be conveyed, particularly, a powder or granule, and a container having the door opening/closing mechanism.

Background

Conventionally, as a method for conveying a powder or granule such as a wooden pellet, there is a method for conveying a bulk container using a box-shaped container.

Such bulk containers are transported by, for example, installing an inner bag in a box container mounted on a vehicle and filling the inner bag with a powder or granular material, and after the container reaches a destination, the box container is mounted on a loading platform having a tilting device, the box container is tilted, and the powder or granular material is discharged from a powder or granular material discharge port provided at a position which becomes a lower end of the inner bag when the container is tilted.

An example of such a container is disclosed in patent document 1.

For example, japanese unexamined patent publication No. 63-131992 (patent document 1) proposes a bulk container that can smoothly discharge cargoes, and when the cargoes are discharged, the cargo can be safely discharged without fear of spilling from the side.

The bulk container is provided with an opening and closing door, the lower end of the opening and closing door is fixed below the rear plate in a freely rotating way,

an end of a freely reelable rope (wire) is fixed above the opening and closing door by a winch,

canvas for preventing goods from spilling is arranged between the side part of the opening/closing door and the corresponding side part of the opening part,

and a guide plate, the lower end of which is fixed on the opening and closing door side of the floor part in a freely rotating way, when the opening and closing door is opened horizontally, the guide plate is erected between the inner side surface of the opening and closing door and the floor surface.

Documents of the prior art

Patent document

Patent document 1: japanese Kokai Sho 63-131992 (utility model registration claims, FIGS. 1-3)

Disclosure of Invention

Problems to be solved by the invention

In the case type container for transporting the powder or granular material such as the bulk container described in patent document 1, the powder or granular material as the transported object to be filled is always in contact with the opening/closing door, and the opening/closing door is pressed with the pressing force based on the load of the transported object, and therefore, there is a problem that the powder or granular material may leak from the free end portion of the opening/closing door, particularly when the opening/closing door is forgotten to be locked.

Thus, further improvement in safety is required.

In view of the above-described situation, the present invention is intended to provide a door opening/closing mechanism and a container having the door opening/closing mechanism, the door opening/closing mechanism including: the leakage of the transported object, particularly, the powder or granular material from the door (opening/closing door) of the container can be prevented or suppressed with a very high probability, and the transported object, particularly, the powder or granular material can be safely loaded and stored.

Means for solving the problems

The invention described in claim 1 of the present invention is an opening/closing mechanism for a container, which is provided in an opening portion formed in a container having a box-shaped upper wall, side walls, and a bottom wall, in order to open or close the opening portion of at least 1 of the side walls,

the opening and closing mechanism is characterized in that,

the opening/closing mechanism includes an outer door supported rotatably in a vertical direction at or near an upper end of the opening portion, and an inner door supported rotatably in a vertical direction on the bottom wall with a predetermined distance inward from the outer door,

the inner door is arranged at the following positions: when the inner door is rotated outward in a state where the outer door closes the opening, an upper end edge thereof abuts against an inner surface of the outer door.

According to the opening and closing mechanism of claim 1,

the invention described in claim 2 of the present invention is characterized in that,

the outer door is constructed such that,

the opening is opened or closed at the outside, the upper end edge of the opening is rotatably supported on the side wall at or near the upper end of the opening, and the lower end side is a free end,

the inner door is constructed such that,

the opening is opened or closed at the inner side, the lower end edge of the opening is rotatably supported on the bottom wall, the upper end side is a free end part,

the opening and closing mechanism is configured such that a support member having a magnet is provided so as to protrude inward of the inner door, and the support member attracts an upper end portion of the inner door, thereby holding the inner door in a standing state.

The opening/closing mechanism according to claim 1 or 2,

the invention according to claim 3 of the present invention is characterized in that,

the opening portion is formed so that the opening portion,

one fourth to one ninth of the lower end of the side wall.

According to the opening and closing mechanism of claim 2,

the invention according to claim 4 of the present invention is characterized in that,

the opening portion is formed so that the opening portion,

the opening size of the inner side of the container is one seventh to one ninth of the lower end part of the side wall of the container,

the inner door is constructed such that,

abutting against or separating from the support member in accordance with an attracting force of a magnetic force generated between the inner door and the magnet and an inner pressure of the container,

the inner door and the magnet are configured such that the inner door contacts the support member when the internal pressure of the container is less than 300kgf, and the inner door is separated from the support member when the internal pressure of the container is 300kgf or more.

The opening/closing mechanism according to claim 1 or 2,

the invention according to claim 5 of the present invention is characterized in that,

the inner door is constructed such that,

the distance between the abutting position of the inner door with the inner surface of the outer door and the center of the supporting shaft for supporting the rotation of the outer door is less than or equal to one half of the distance between the abutting position of the inner door with the inner surface of the outer door and the lower end edge of the outer door.

According to the opening and closing mechanism of claim 5,

the invention according to claim 6 of the present invention is characterized in that,

the outer door is configured to satisfy the following expression.

{ (mass of outer door) × (gravitational acceleration) } ≧ { (distance between the position of the support shaft that supports the inner door and the position to which the force generated by the load of the object is applied) × (distance between the position of the support shaft that supports the outer door and the position to which the force is applied from the inner door) }/{ (distance between the position of the support shaft that supports the inner door and the position at which the inner door abuts against the inner surface of the outer door) × (distance between the position of the support shaft that supports the outer door and the lower end portion of the outer door) } ] × (force applied to the inner door based on the load of the object).

The opening/closing mechanism according to any one of claims 1 to 6,

the invention according to claim 7 of the present invention is characterized in that,

the opening is formed in the side wall on the rear end side.

The invention described in claim 8 is a container, characterized in that,

the container has the opening and closing mechanism according to any one of claims 1 to 7.

ADVANTAGEOUS EFFECTS OF INVENTION

An opening/closing mechanism according to the present invention is configured to be provided in an opening portion formed in a container in which an upper wall, a side wall, and a bottom wall form a box shape, in order to open or close the opening portion, the opening/closing mechanism including an outer door supported rotatably in a vertical direction at an upper end of the opening portion or in a vicinity thereof, and an inner door supported rotatably in a vertical direction at the bottom wall with a predetermined distance from the outer door inward, the inner door being provided at a position where: when the inner door is rotated outward in a state where the outer door closes the opening, an upper end edge thereof abuts against an inner surface of the outer door.

Therefore, according to this opening/closing mechanism, the conveyed object filled in the container is brought into contact with the inner door to press the inner door with the pressing force based on the load of the conveyed object, but is not brought into contact with the outer door and the outer door is not pressed either, so that leakage of the conveyed object from the free end portion of the outer door can be prevented or suppressed with an extremely high probability.

Therefore, according to the container having the opening and closing mechanism, the transported object can be safely loaded and stored.

This effect is remarkable when the material to be transported is a powder or granule.

In the opening/closing mechanism, the outer door may be configured such that an upper end edge thereof is rotatably supported by a side wall at or near an upper end of the opening portion and a lower end side thereof is a free end portion in order to open or close an outer side of the opening portion, and the inner door may be configured such that a lower end edge thereof is rotatably supported by a bottom wall and an upper end side thereof is a free end portion in order to open or close an inner side of the opening portion, and the opening/closing member may be configured such that a support member having a magnet is provided so as to protrude from a position inward of the inner door, and the support member attracts the upper end portion of the inner door, thereby holding the inner door in an upright state.

The opening may be formed in a side wall of the container, preferably a lower end portion of the side wall on the rear end side, and more preferably one fourth to one ninth of the lower end portion of the side wall.

With this configuration, the object can be more easily conveyed.

In the opening/closing mechanism, the opening may be formed such that an opening size of an inner side thereof is one seventh to one ninth of a lower end portion of a side wall of the container, the inner door may be configured such that a vertical width thereof is one seventh to one ninth of a height of the container, and the inner door may be configured to abut against or separate from the support member in accordance with an adsorption force of a magnetic force generated between the inner door and the magnet and an internal pressure of the container, and the inner door and the magnet may be configured such that the inner door abuts against the support member when the internal pressure of the container is less than 300kgf and the inner door separates from the support member when the internal pressure of the container is 300kgf or more.

According to this configuration, the opening can be opened only by tilting the container at a predetermined angle.

In the opening/closing mechanism, the inner door may be configured such that a distance between an abutment position of the inner door with the inner surface of the outer door and a center of a support shaft that supports the rotation of the outer door is equal to or less than one-half of a distance between an abutment position of the inner door with the inner surface of the outer door and a lower end edge of the outer door.

According to this configuration, the pressing force based on the load of the object to be conveyed is more reliably transmitted to the lower end portion of the outer door as a force smaller than the force that is originally transmitted.

Therefore, the outer door as the opening/closing door is easily locked, and thus the loaded and stored objects can be easily and safely discharged.

In this case, the outer door may be configured to satisfy the following expression.

According to such a configuration, the closing of the outer door can be simply and firmly locked without using a locking unit.

Further, the unlocking of the closing of the outer door and the opening of the opening can be performed only by lifting and tilting the container on the side opposite to the opening/closing door (the front end side in the case where the opening is formed in the side wall on the rear end side), and therefore, the unlocking of the closing of the outer door and the opening of the opening can be performed very safely.

The opening/closing mechanism may be provided in an opening formed in at least 1 side wall of a container having a box-shaped upper wall, side walls, and a bottom wall.

Drawings

Fig. 1 is a front view showing an example of an opening/closing mechanism provided in an opening formed in a side wall on the rear end side of a container as an example of the opening/closing mechanism of the present invention.

Fig. 2 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A' of fig. 1.

Fig. 3 is an explanatory diagram showing an example of a main part of the opening/closing mechanism of the present invention.

Fig. 4 is an explanatory view showing a mechanism of the opening and closing mechanism shown in fig. 3, fig. 4 (a) shows a state where a container is standing on a horizontal plane and an opening portion thereof is closed by an inner door and an outer door, fig. 4 (B) shows a state where an object to be conveyed is filled in the container, fig. 4 (C) shows a state where the container is in a state where a front end side thereof is raised and inclined at an angle of 10 ° to the left and right, fig. 4 (D) shows a state where the front end side is further raised and inclined at an angle of 20 ° to the left and right, and fig. 4 (E) shows a state where the front end side is further raised and inclined at an angle of 30 ° to the left and right and the object to be conveyed is completely discharged.

Fig. 5 is an explanatory diagram showing an example of a main part of the lock mechanism of the present invention.

Fig. 6 is an explanatory diagram showing a mechanism of a lock mechanism provided in an opening and closing mechanism of the present invention, in which fig. 6 (a) shows a state where a container not filled with a transported object is standing on a horizontal plane and an opening portion is closed by an inner door and an outer door, fig. 6 (B) shows a state where the container is filled with the transported object and the inner door is rotated outward and brought into contact with an inner surface of the outer door closing the opening portion, fig. 6 (C) shows a state where the container is in a state where a front end side thereof is raised and inclined at an angle of 10 ° left and right, fig. 6 (D) shows a state where the front end side is further raised and inclined at an angle of 15 ° left and right, fig. 6 (E) shows a state where the front end side is further raised and inclined at an angle of 20 ° left and right, and fig. 6 (F) shows a state where the front end side is further raised and inclined at an angle of 25 ° to 30 ° left and the transported object is completely discharged.

Description of the reference numerals

1. A container; 2. a container main body; 3. an upper wall; 4. a lateral side wall of the left side; 5. a side wall on the right side; 6. a side wall on the rear end side; 6a, an opening; 6b, a holding member; 7. a bottom wall; 8. an opening and closing mechanism; 81. an outer door; 81a, hinge 1; 81b, the 1 st support shaft; 82. an inner door; 82a, a 2 nd support shaft; 82b, an abutting portion; 9. a locking unit; 9a, a locking rod; 9b, an operating handle; 10. a seal member; m, a magnet.

Detailed Description

An embodiment of the container of the present invention is specifically described below based on the appended drawings.

The present invention is not limited to the embodiments disclosed, and various modifications can be made without departing from the spirit and scope of the present invention.

Fig. 1 is a front view of the rear end side of a container 1 of the present invention.

The container body 2 constituting the container 1 is not particularly shown, and is formed in an elongated box shape by an upper wall 3, a pair of long-side walls 4 and 5, a pair of short-side walls (a front side wall (not shown) and a rear side wall 6), and a bottom wall 7, and is in accordance with ISO (international organization for standardization) and CSC (international treaty on container safety), which are standards for international maritime containers.

When the container 1 is mounted on a vehicle, the rear end side of the container body 2 is located on the rear side.

As shown in fig. 1, an opening 6a having a desired size (opening dimension) is provided in a side wall 6 on the rear end side of the container body 2, and an opening/closing mechanism 8 capable of opening or closing the opening 6a is provided.

As shown in fig. 1 and 2, the opening/closing mechanism 8 includes an outer door 81 and an inner door 82, the outer door 81 is configured to be rotated in the vertical direction toward the outside to open or close the outlet side (outside) of the opening 6a, and the inner door 82 is configured to be disposed at a predetermined interval inside the outer door 81 and to be rotated in the vertical direction toward the outside to open or close the inlet side (inside) of the opening 6a.

In this embodiment, the outer door 81 and the inner door 82 constituting the opening/closing mechanism 8 are made of a metal material from the viewpoints of strength retention, quality, and the like in use, but an appropriate material can be selected as long as the effect of the present invention is not impaired.

The outer door 81 is formed of a plate-like body having a rectangular shape in front view as shown in fig. 1, and is configured such that, as shown in fig. 2, one end side (upper end edge in fig. 1 to 3) in the short side direction is rotatably supported by the side wall 6 at or near the upper end of the outlet side of the opening 6a via a hinge (1 st hinge) 81a having an inverted letter L shape in side view, and the other end side (lower end side in fig. 1 to 3) is a free end.

Further, reference numeral 81b is a support shaft (1 st support shaft) as a rotation center of the hinge 81 a.

In fig. 1 and 2, a lock unit 9 for locking the outer door 81 is provided in the outer door 81 to prevent the outer door 81 from being opened accidentally.

In fig. 1, the lock unit 9 is constituted by a lock lever 9a and an operation handle 9b, the lock lever 9a is bar-shaped and extends between the side walls 4 and 5 in the vicinity of the outer door 81 to lock the closing of the outer door 81, and the operation handle 9b is attached to the lock lever 9a and is rotated by operating the lock lever 9 to lock and unlock the outer door 81.

Further, a seal 10 or the like is provided around the outer door 81 to maintain airtightness.

The inner door 82 is disposed at a position inward of the outer door 81 with a predetermined distance, and is formed of a plate-like body having a rectangular shape in front view, and is configured such that one end side in the short side direction (lower end edge in fig. 2 and 3) is rotatably supported on the bottom wall 7 via a hinge (2 nd hinge) (not shown) having a shape of japanese kana く in side view, and the other end side (upper end side in fig. 1 to 3) is a free end portion.

Therefore, the conveyed object filled in the container 1 abuts on the inner door 82, and presses the inner door 82 with the pressing force based on the load of the conveyed object, but does not abut on the outer door 81, and the outer door 81 is not pressed, so that even when the locking of the closing of the outer door 81 is forgotten, the leakage of the conveyed object from the free end portion (the lower end side in fig. 1 to 3) of the outer door 81 can be prevented or suppressed with an extremely high probability.

In addition, reference numeral 82a is a support shaft (2 nd support shaft) as a rotation center of the hinge (2 nd hinge).

The size (opening size) of the opening 6a is not particularly limited, and may be appropriately selected according to the size of the container, and the opening 6a is preferably formed so as to occupy about one fourth to one ninth of the lower end portion of the side wall forming the opening 6a.

Therefore, the outer door 81 and the inner door 82 may be configured to have a size corresponding to the opening 6a.

In fig. 2 and 3, the opening 6a is formed such that the outlet side (outer side) thereof occupies approximately one fourth to one fifth of the outer lower end portion of the side wall 6, and the inlet side (inner side) thereof occupies approximately one seventh to one ninth of the inner lower end portion of the side wall 6.

According to such a configuration, since the vertical width (the width in the vertical direction in fig. 2 and 3) of the inner door 82 is one seventh to one ninth of the height of the container, the inner door 82 can be easily returned to the vertically erected state after the discharge of the objects is completed.

For example, when the height of the container 1 is about 2600cm, the vertical width of the inner door 82 can be about 300 to 400 cm.

In fig. 3, a support member 6b is provided so as to protrude from an upper end of the opening portion 6a on the inner side of the inner door 82, and the support member 6b abuts against the inner door 82 to restrict inward rotation of the inner door 82 and holds the inner door 82 in a state of standing up (in fig. 3) with respect to the bottom wall 7.

The support member 6b is configured to abut against the inner door 82 via a magnet M, and as shown in fig. 3, the support member 6b has the magnet M at least on a surface abutting against the inner door 82.

On the other hand, at least a portion of the inner door 82, which the magnet M abuts against, is made of a magnetic material so that the inner door 82 is attracted to the support member 6b by a magnetic force generated between the inner door 82 and the magnet M.

Therefore, when the inner door 82 is closed, the magnet M attracts the inner door 82 by its magnetic force, and therefore, even in a state where the object is input, the support member 6b can pull the inner door 82 and hold it in an upright state.

In addition, the contact surfaces of the inner door 82 and the magnet M are both configured as smooth surfaces in terms of rigidity or holding force.

The magnet may be selected from magnets having a property of attracting a magnetic substance by magnetization, and is not particularly limited.

As the magnet, for example, a neodymium magnet can be selected.

In fig. 2 and 3, the inner door 82 is configured to be brought into contact with or separated from the support member 6b in accordance with an attractive force of a magnetic force generated between the inner door 82 and the magnet M and an internal pressure of the container 1.

According to such a configuration, in a state where the container 1 is stationary and the opening portion 6a is closed by the inner door 82, when the conveyed material is filled in the container 1, the pressure (internal pressure) inside the container 1 is maintained at a predetermined value, and therefore, if the magnet M is configured to attract the inner door 82 by the magnetic force of the magnet M when the internal pressure of the container 1 is the internal pressure, and on the other hand, if the inner door 82 is separated from the support member 6b when the internal pressure of the container 1 is higher than the internal pressure, the inner door 82 comes into contact with the support member 6b in the above state.

On the other hand, when the container 1 is tilted to a predetermined angle (for example, about 30 °), the internal pressure of the container 1 rises, and therefore, the inner door 82 is separated from the support member 6b, and the outer door 81 is also rotated outward by further tilting the container 1 after that, and the opening 6a is opened.

For example, the inner door 82 and the magnet M may be configured such that the inner door 82 abuts against the support member 6b when the internal pressure of the container 1 is less than 300kgf, and the inner door 82 is separated from the support member 6b when the internal pressure of the container 1 is 300kgf or more.

The inner door 82 may be configured to come into contact with or separate from the support member 6b in accordance with an attracting force of a magnetic force generated between the inner door 82 and the magnet M and a pressing force based on a load of the object to be conveyed.

Further, the magnet M may be provided in an amount of 1 or more than one to the support member 6b, as long as the effect of the present invention is not impaired.

An example of the operation performed by the opening/closing mechanism 8 will be specifically described.

In fig. 4 (a), in the container 1, the opening 6a formed in the side wall 6 of the container 1 is configured such that the outlet side (outside) thereof occupies approximately one fourth to one fifth of the outer lower end portion of the side wall 6, and the inlet side (inside) thereof occupies approximately one seventh to one ninth of the inner lower end portion of the side wall 6.

The container 1 is stationary on a horizontal surface, and the opening 6a is closed at the outer side by the outer door 81 and at the inner side by the inner door 82.

In addition, the closing of the outer door 81 is locked by the locking unit 9.

As shown in fig. 4 (a), a support member 6b is provided at the upper end of the opening 6a on the inner side of the inner door 82 so as to protrude inward.

More specifically, in fig. 4 (a), the support member 6b is formed of a plate-like body having an L-shape in side view, and is provided to protrude downward.

The inner door 82 is restricted from rotating inward by the support member 6b, and is held in a state of standing vertically with respect to the bottom wall 7.

As shown in fig. 4 (a), the support member 6b is configured to be in contact with the inner door 82 via the magnet M, that is, has the magnet M on the side in contact with the inner door 82.

In fig. 4 (B), the container 1 is in the following state: the locking of the locking unit 9 is released, and the inside of the container 1 is filled with a material to be transported (not shown), and the inside of the container 1 is maintained at a predetermined pressure.

In addition, in this embodiment, the internal pressure is set to less than 300kgf.

The magnet M is configured to have a magnetic force such that the magnet M attracts the inner door 82 when the internal pressure of the container 1 is the pressure and the magnet M separates the inner door 82 when the internal pressure of the container 1 is higher than the pressure.

Therefore, as shown in fig. 4 (B), when the container 1 is left standing and the opening 6a is closed by the inner door 82, the inner door 82 and the support member 6B come into contact with each other by the magnetic force acting between the inner door 82 and the magnet M when the container 1 is filled with the material to be conveyed, and the inner door 82 closes the opening 6a in the standing state. The inner door 82 is attracted by the magnetic force as long as the pressure is maintained.

As shown in fig. 4C, when the container 1 is tilted by raising the side (the front end side in this embodiment) opposite to the opening/closing door, the internal pressure of the container 1 gradually increases.

As shown in fig. 4 (D), when the container 1 is further tilted and the internal pressure of the container 1 is 300kgf or more, the inner door 82 is separated from the support member 6b and abuts against the outer door 81.

When the container 1 is further tilted from this state, the pressing force due to the load of the transported object is transmitted to the outer door 81 via the inner door 82, and the inner pressure of the container 1 becomes further high, so that the outer door 81 is rotated outward as shown in fig. 4 (E), and as a result, the opening 6a is opened, and the transported object is discharged.

As shown in fig. 5, the inner door 82 may be configured such that when the inner door 82 is turned (tilted) outward in a state where the opening portion 6a is closed by the outer door 81, an upper end edge (abutting portion 82 b) thereof abuts against an inner surface of the outer door 81.

The contact position can be set to the following position: the distance between the axial center of the 1 st support shaft 81b and the abutment position is smaller than the distance between the lower end edge of the outer door 81 and the abutment position, and the following positions are more preferably selected: the distance between the axis of the 1 st support shaft 81b and the abutment position is equal to or less than one-half of the distance between the lower end edge of the outer door 81 and the abutment position.

According to such a configuration, the pressing force based on the load of the conveyed object can be transmitted as a small force at the lower end portion (operating point) of the outer door 81, and therefore, the closing of the outer door can be easily locked.

Namely, assistance in locking the closing of the outer door is achieved.

In this embodiment, the inner door 82 is disposed such that its upper end edge abuts on the vicinity of the upper end of the inner surface of the outer door 81 when it is turned (tilted) outward by about 10 °.

The mechanism of the lock mechanism having such a structure is described below.

In the inner door 82, the 2 nd support shaft 82a (specifically, the axial center thereof) that supports the inner door 82 functions as a fulcrum, a position to which a force generated by a load of a conveyed object is applied functions as a force point, and a position (contact portion 82 b) that is in contact with the inner surface of the outer door 81 functions as a point of action.

In the present invention, since the fulcrum is located outside and closer to the force point and the action point, a small motion applied to the force point becomes a large motion at the action point.

Therefore, at the action point, the pressing force based on the load of the object to be conveyed applied to the force point is reduced by the principle of leverage, and is transmitted as a force smaller than the pressing force.

Specifically, assuming that the distance between the fulcrum and the force point is D1, the distance between the fulcrum and the action point is D1, the pressing force by the load of the object applied to the force point is F1, and the force transmitted at the action point is F1, the relationship of D1 × F1= D1 × F1 (D1 < D1) is established.

On the other hand, in the outer door 81, the 1 st support shaft 81b (specifically, the axial center thereof) disposed at or near the upper end of the opening portion 6a and supporting the outer door 81 functions as a fulcrum, a position where a force is applied from the inner door 82 (an abutting position of the inner surface of the outer door 81 with the inner door 82) functions as a force point, and a lower end portion of the outer door 81 functions as an action point.

Therefore, at the point of action, the force transmitted from the inner door 82 applied to the point of force is reduced by the principle of leverage, and is transmitted as a force smaller than this force.

That is, the pressing force based on the load of the object is transmitted as a smaller force at the point of action of the outer door 81.

Specifically, assuming that the distance between the fulcrum and the force point is D2, the distance between the fulcrum and the action point is D2, the force applied to the force point and transmitted from the inner door 82 is F2, and the force at the action point is F2, the relationship of D2 × F2= D2 × F2 (D2 < D2) is established.

Here, since F2= F1, (D2 × D1 × F1)/D1 = D2 × F2.

Therefore, in a state where the opening portion 6a is closed, the pressing force F1 based on the load of the conveyed object is reduced by the lever principle, and the force F2 of (D2 × D1)/(D1 × D2) of the pressing force F1 is transmitted outward at the lower end portion (operating point) of the outer door 81.

Therefore, in the present invention, even when a less strong locking means is used for the outer door 81, the closing of the outer door 81 can be reliably locked.

In this embodiment, the mass m of the outer door 81 is set so as to satisfy F2. Ltoreq. Mg when the acceleration of gravity is g.

Therefore, in a normal state (in a state where the container is in a standing state), the outer door 81 is not opened by the load of the conveyed object, and therefore, the container of the present invention does not require a locking unit for locking the closing of the outer door, or only requires a relatively simple locking unit to be attached to the outer door.

Therefore, the operator can unlock the closing of the outer door and open the opening only by lifting and tilting the side (in the present embodiment, the front end side) opposite to the open/close door of the container without standing in front of the outer door (open/close door), and therefore, the unlocking of the closing of the outer door and the opening of the opening can be performed very safely.

As shown in fig. 6, for example, the opening/closing mechanism 8 having the lock mechanism having such a structure can discharge the object.

In fig. 6a, the container 1 is configured such that the opening 6a formed in the side wall 6 (rear end side in the present embodiment) occupies approximately one fourth to one fifth of the lower end portion of the side wall 6 on both the outlet side and the inlet side, the outer door 81 closes the outside of the opening 6a, and the inner door 82 closes the inside of the opening 6a.

The container 1 is at rest on a horizontal surface as shown in fig. 6 (a).

As shown in fig. 6 (a), a support member 6b is provided at the upper end of the opening 6a on the inner side of the inner door 82 so as to protrude inward.

More specifically, in fig. 6 (a), the support member 6b is formed of a plate-like body and is provided to protrude downward.

In fig. 6 (a), the support member 6b is configured to abut against the inner door 82 via the magnet M, that is, it has the magnet M on the side abutting against the inner door 82.

The magnet M attracts the inner door 82 by its magnetic force, but when the conveyed material is charged from a charge port (not shown) provided in the upper wall 3 and filled in the container 1 in a state where the outer door 81 is locked in the closed state, the inner door 82 is configured to be separated from the support member 6B by a pressing force based on the load of the conveyed material, as shown in fig. 6B.

In fig. 6 (B), the pressing force F2 based on the load of the transported object, which is applied from the inside toward the outside with respect to the lower end portion of the outer door 81, is set such that F2 is equal to or less than mg when the mass of the outer door 81 is m and the gravitational acceleration is g, and therefore, the outer door 81 is in a state in which its closing is locked in a state in which the container 1 is standing on a horizontal plane, and therefore, is not opened by the load of the transported object.

When the side of the container 1 opposite to the opening/closing door (the front end side in the present embodiment) is lifted, as shown in fig. 6 (C), when the inclination angle of the container 1 reaches about 10 °, the outer door 81 is rotated outward (the rear side in the present embodiment) by its own weight.

When the side of the container 1 opposite to the opening/closing door is further lifted from this state, the opening 6a is opened along with the rotation of the outer door 81, and when the opening 6a is completely opened, all the objects to be conveyed are discharged ((D) of fig. 6 → (F) of fig. 6).

In the present embodiment, the opening/closing mechanism 8 is provided in the opening portion 6a formed in the side wall 6 on the rear end side, but the opening portion is not limited to the side wall on the rear end side, and may be formed in at least 1 or more of the side walls constituting the container main body, and the opening/closing mechanism may be provided in each of the opening portions.

The container of the present invention can be used for transporting powder or granular material such as wood particles, but can be used for transporting general cargo.

Industrial applicability

The opening and closing mechanism of the present invention can prevent or suppress with a very high probability leakage of a transported object, particularly a powder or granular material, filled in a container from an opening and closing door (outer door) by providing the inner door with a predetermined distance from the outer door constituting the opening and closing door of the container to the inside, can safely load and store the transported object, particularly the powder or granular material, and can be applied to all containers.

Claims

1. An opening/closing mechanism for a container, which is provided in an opening portion formed in a container having a box-shaped upper wall, side walls, and a bottom wall, for opening or closing the opening portion of at least 1 of the side walls,

the opening and closing mechanism is characterized in that,

the inner door is arranged at the following positions: when the inner door is rotated outward in a state where the outer door closes the opening portion, an upper end edge thereof abuts against an inner surface of the outer door,

the opening and closing mechanism is configured in such a manner that a support member having a magnet is provided so as to protrude inward of the inner door, the support member attracts an upper end portion of the inner door to hold the inner door in a standing state,

the inner door is constructed such that,

2. The opening-closing mechanism according to claim 1,

the outer door is constructed such that,

the inner door is constructed such that,

the opening is opened or closed at the inside thereof, and the lower end edge thereof is rotatably supported by the bottom wall, and the upper end side thereof is a free end portion.

3. The opening-closing mechanism according to claim 1 or 2,

the opening part is positioned at the lower end part of the side wall and has a size of one fourth to one ninth of the height of the container.

4. The opening-closing mechanism according to claim 1 or 2,

the opening part is positioned at the lower end part of the side wall, and the opening size of the inner side of the opening part is one seventh to one ninth of the height of the container.

5. The opening-closing mechanism according to claim 1 or 2,

the inner door is constructed such that,

the distance between the contact position of the inner door with the inner surface of the outer door and the center of the support shaft supporting the rotation of the outer door is less than or equal to one half of the distance between the contact position of the inner door with the inner surface of the outer door and the lower end edge of the outer door.

6. The opening-closing mechanism according to claim 5,

the outer door is configured to satisfy the following expression,

7. The opening-closing mechanism according to claim 1 or 2,

the opening is formed in the side wall on the rear end side.

8. A container, which is characterized in that,

the container has the opening/closing mechanism according to any one of claims 1 to 7.