JP2003137391A - Hopper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hopper whose gate can be smoothly and reliably opened/ closed, and which can prevent a powder and granular substance from falling down from the gate when closed. SOLUTION: The hopper includes a hopper body 1 having at its lower end a discharge port 5 rectangular when viewed on a plane which is surrounded by left and right sidewalls 2a and 2b, a front wall 3 and a rear wall 4, and a single swinging gate 11 for opening/closing the discharge port which is driven to rotate around a horizontal axis and rotates from a side of the rear wall 4 to a side of the front wall 3 during a closing operation. A lower end surface 6 of the sidewalls 2a and 2b is formed to be a convex arcuate surface. The curved-plate gate 11 having a concave arcuate face to be slammed with the lower end surface 6 when closed is rotatably supported around the horizontal axis P placed backward from respective normal lines Y-Y and X-X on a rear end 6b and a front end 6a on the lower end surface 6 of the sidewalls 2a and 2b.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a hopper for temporarily storing powder or granules.

[0002]

2. Description of the Related Art For example, in an alloy manufacturing process, a weighing hopper having a hopper body supported by a load cell is used as a weighing device for weighing and feeding a powdery raw material supplied from a raw material hopper to a melting furnace. There is. This weighing hopper measures the mass of the raw material supplied from the raw material hopper into the hopper main body by the feeder, and when it detects that the predetermined mass has been reached, stops the supply by the feeder and then opens the outlet at the bottom of the hopper main body. Raw materials are discharged and transported to a melting furnace by a belt conveyor or the like.

As shown in FIG. 19, this weighing hopper is a gate device for opening and closing the outlet 52 at the lower part of the hopper body 51. A curved plate-shaped gate 54 formed in a planar shape and having a concave arc surface concentric with the convex arc surface facing the convex arc surface with a small clearance is provided around a horizontal axis P passing through the center of the convex arc surface. A type in which the gate 54 is rotatably supported and the gate 54 is rotatably driven by a drive mechanism such as an air cylinder (not shown) is widely adopted. Reference numeral 55 is a load cell for weighing that supports the upper portion of the hopper body 51.

However, in the hopper 50 having the gate 54 of the above type, the hopper body 5 is rotated when the gate is rotated.
The powder particles are easily caught between the lower end surface 53 of 1 and the upper surface of the gate 54, and the gate 54 is locked in the middle of opening, resulting in an insufficient amount of raw material discharged or an accident in which the material cannot be discharged, and the gate is closed. At times, there are many problems, such as the small particle size raw material spilling out from the gap between the lower end surface 53 and the gate 54, and the weighing becomes inaccurate, which causes the composition of the final alloy product to be defective. Met.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems of the prior art, and can open and close the gate smoothly and surely, and spills of powder or granules from the gate portion when the gate is closed. It is an object of the present invention to provide a hopper that can prevent the above.

[0006]

In order to achieve the above object, a hopper according to a first aspect of the present invention has a lower end provided with a payout outlet which is surrounded by left and right side walls, a front wall and a rear wall and which is rectangular in plan view. A hopper having a hopper main body and a single-opening gate for opening and closing the outlet, which is driven to rotate about a horizontal axis and rotates from the rear wall side toward the front wall side during a closing operation. A curved plate-shaped gate having a lower end surface of the side wall formed in a convex arc surface shape and having a concave arc surface part that abuts against the lower end surface when closed, at each of a rear end portion and a front end portion of the lower end surface of the side wall. It is characterized in that it is rotatably supported around a horizontal axis arranged at a position rearward of the normal line.

According to a second aspect of the present invention, there is provided a hopper main body having a lower end portion having a discharge opening of a quadrangle in plan view surrounded by left and right side walls, a front wall and a rear wall, and a hopper which is rotated about a horizontal axis. In a hopper having a single-opening type gate for opening and closing the outlet opening that rotates from the rear wall side toward the front wall side during closing operation, the lower end surface of the side wall is formed in a flat shape, A flat plate-shaped gate having a flat portion that abuts against the lower end surface when closed is rotatably provided around a horizontal axis that is arranged at a position rearward of a normal line at the rear end of the lower end surface of the side wall. It is characterized by having supported.

In the present invention, the "front" side refers to the gate advancing direction side when the payout opening is closed, and the "rear" side is the gate advancing direction side when the payout opening is open. Shall be pointed out.

According to the means of claims 1 and 2, when the gate is closed, the concave arc surface portion (claim 1) or the flat surface portion (claim 2) of the gate abuts against the lower end surface of the side wall, so that The clearance between them is very small, and the spillage of the powder or granules from this clearance is suppressed to a very small amount. Further, during the opening operation of the gate, by arranging the horizontal axis in the range defined in each claim, the gate is provided on the side wall as shown by an arrow R in FIGS. 1 and 6 showing an embodiment described later. Since it rotates while being separated from the lower end surface, the granular material is not caught between the two during this rotation, and the gate rotates smoothly and reliably.

Further, in the hopper according to the first or second aspect, as in the invention according to the third aspect, a structure is provided in which a lower end portion of the front wall is provided with an abutment plate with which the front end edge of the gate abuts when closed. In this case, the powder or granules that are about to spill out of the gap between the front end portion of the gate and the front wall are prevented from spilling downward due to the contact between the front end edge of the gate and the abutting plate.

According to a fourth aspect of the present invention, there is provided a hopper main body having a lower end having a quadrangular outlet in a plan view which is surrounded by left and right side walls and a pair of end walls, and is rotated about a horizontal axis. In a hopper having a double-opening gate for opening and closing the outlet, which rotates from the end wall side toward the center of the outlet during closing operation, the lower end surface of the side wall is formed into a convex arc surface. A pair of curved plate-shaped gates having a concave arc surface portion that abuts against the half of the lower end surface when closed.
It is characterized in that the side wall is rotatably supported around a horizontal axis arranged at an outer end of the lower end surface of the side wall and at a position outside each normal at the center of the outlet.

According to a fifth aspect of the present invention, there is provided a hopper main body having a lower end portion having a discharge opening of a quadrangular shape in plan view surrounded by left and right side walls and a pair of end walls, and is driven to rotate about a horizontal axis. In a hopper having a double-opening gate for opening and closing the outlet, which is rotated from the end wall side toward the center of the outlet during closing operation, the lower end surface of the side wall is A pair of flat plate-shaped gates, each of which is formed into a mountain-shaped bent surface inclined upward from the apex located at the center toward each end wall and has a flat portion that abuts with half of the lower end surface when closed; It is characterized in that it is rotatably supported around a horizontal axis arranged at a position outside each normal at the outer end of the lower end surface of the side wall.

According to a sixth aspect of the present invention, there is provided a hopper main body having a lower end portion having a quadrangular outlet in a plan view surrounded by left and right side walls and a pair of end walls, and is pivotally driven about a horizontal axis. In the hopper having the double-opening type gate for opening and closing the outlet, which is rotated from the end wall side toward the center of the outlet during the closing operation, the lower end surface of the side wall is formed into a flat shape. , A pair of flat plate-shaped gates having a flat portion that abuts against half of the lower end face when closed, around a horizontal axis that is arranged at a position outside each normal line at the outer end of the lower end face of the side wall. , Each of which is rotatably supported.

In the present invention, the "outside" side refers to the respective advancing directions of the double-opening type gate when the payout opening is opened.

According to the means of claims 4 to 6, depending on the shape of the lower end surface of the side wall, a pair of curved plate-shaped gates according to claim 1 is provided (claim 4) or the flat plate-like structure according to claim 2. Since a pair of gates are provided (Claims 5 and 6) to form a hopper with a double-opening type gate, the same spillage suppressing effect of powder and granules as in Claims 1 and 2 and smooth operation during gate opening
A reliable gate turning operation can be obtained.

Further, in the hopper according to any one of claims 4 to 6, as in the invention according to claim 7, the front end portion of one of the pair of gates is provided with the front end portion lower surface of the other gate when closed. If the overlapped overlapping piece is provided, the overlapping piece prevents the granular material from spilling out from the gap between the front end edges of both gates when the gate is closed.

Further, in the hopper according to any one of claims 1 to 7,
According to the invention of claim 8, when the upper surface of the gate is provided with a groove into which the lower end of the side wall is fitted when the gate is closed, the lower end surface of the side wall and the lower end surface of the side wall are closed when the gate is closed. The clearance between the bottom surface of the groove and the bottom surface of the groove is very small, and a narrow clearance is also formed between the side surface of the lower end portion of the side wall and the side surface of the groove by fitting the lower end portion of the side wall and the groove. Therefore, the amount of powdery particles spilling out from the gap between the side wall and the gate is suppressed to a much smaller amount.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to a first example shown in FIGS. In the figure, reference numeral 1 denotes a hopper body, which is composed of a rectangular cylindrical body whose left and right side walls 2a and 2b, a front wall 3 and a rear wall 4 constitute a side surface portion and which expands upward. It has an exit 5. The lower end surfaces 6 of the side walls 2a and 2b forming the two sides of the payout opening 5 are
It is formed in a convex arc surface centered on a center O (specifically, a center line extending in the horizontal direction) located immediately above the front end portion 6a of the lower end surface 6.

Reference numeral 11 denotes a curved plate-shaped gate for opening and closing the outlet 5, and the lower ends of the side walls 2a and 2b of the hopper body 1 are fitted on the upper surface of the gate 11 as shown in FIG. Two grooves 12a and 12b extending in the front-rear direction are engraved, and the bottom surfaces 13 of these grooves are formed on the side wall 2 when the gate is closed.
A concave arc surface portion that abuts the lower end surface 6 of a, 2b (hereinafter collectively referred to as side wall 2) is formed, and the radius of curvature thereof is substantially equal to the radius of curvature of the lower end surface 6 of the side wall.

Reference numeral 14 is a substantially fan-shaped side plate fixed to the left and right ends of the gate 11. The upper end of the side plate 14 is rotatably supported by a support shaft 15 attached to the side wall 2.
As a result, the gate 11 is rotatably supported around the horizontal axis P that is the center line of the support shaft 15. And the horizontal axis P is the side wall 2 as shown in FIGS.
Of the rear end portion 6b of the lower end surface 6 of the
-Y behind the normal line X-X at the front end portion 6a of the lower end surface 6, that is, within the range shown by hatching the above normal lines. , Its position has been selected.

Reference numeral 21 is an air cylinder for driving the gate 11 to open and close.
Is rotated about the horizontal axis P from the rear wall 4 toward the front wall 3 to the closed state shown in the figure, and the gate 11 is rotated in the opposite direction by the piston rod retracting action, as shown by the chain line S. Thus, the payout opening 5 is fully opened and is in an open state.

Reference numeral 22 denotes an abutment plate fixedly mounted on the lower end of the front wall 3, and the front end edge 11a of the gate 11 when closed is the front wall 3.
It comes into contact with the abutting plate 22 at a position immediately below. Reference numeral 23 is a load cell that supports the upper end of the hopper main body 1 and is used when it is used as a weighing hopper.

In the hopper 31 having the above-mentioned structure, in the closed state of the gate 11 shown in the figure, the granular material is introduced from the upper end opening of the hopper main body 1, and the hopper main body of the granular material is supplied in response to a predetermined mass measurement signal from the load cell 23. Stop feeding into 1. The concave arc-shaped bottom surface 13 of the grooves 12a and 12b (hereinafter, collectively referred to as the groove 12) of the gate 11 is formed on the lower end surface 6 of the side wall 2 of the hopper body 1 during the charging and the stopping of the powder and granular material. Due to the abutment, the clearance between the two is very small, so the powder or granules rarely spill out from this clearance, and even if the powder or granules pass through this clearance,
Further, it has to pass through a clearance G between the outer surface of the lower end of the side wall 2 and the side surface of the groove 12, so that a small amount of powdery particles spilling out from the clearance between the side wall 2 and the gate 11 is suppressed. .

Further, since the front end edge 11a of the gate 11 is in contact with the abutting plate 22, the powder particles that are about to spill out from between the front end portion of the gate 11 and the lower end surface of the front wall 3 are downward Spills are prevented. In addition, the above-mentioned clearance G
Even if there is a powder or granular material that has passed through the section, the abutting plate 22 prevents the powder or granular material from falling down.

On the other hand, when the gate 11 is rotationally driven in the opening direction by the air cylinder 21 after the introduction of the powder or granular material is stopped, the horizontal axis P which is the rotational center of the gate 11 is the normal line X-. Since it is located on the rear side of X and the normal line Y-Y, the inner surface of the gate 11 (specifically, the bottom surface 13 of the groove 12) does not interfere with the lower end surface 6 of the side wall 2,
As shown by an arrow R, the rotary body rotates while being separated from the lower end surface 6, so that the granular material is not caught between the bottom surface 13 and the lower end surface 6 in accordance with this rotation, and is opened. The rotation of the gate 11 at this time is performed smoothly and surely.

Further, when the gate 11 is opened, the powder particles in the hopper body 1 as well as the powder particles on the gate 11 are dropped downward. Therefore, if the gate 11 is driven to rotate in the closing direction after the completion of the dispensing, the gate 11 is closed. Is in a closed state by rotating while approaching the lower end surface 6 in the direction opposite to the arrow R until the bottom surface 13 of the groove 12 abuts the lower end surface 6 of the side wall 2 and the front edge 11a abuts the abutting plate 22. In this case as well, the granular material does not hinder the rotation and closing operations of the gate 11.

As described above, the spilling of powder particles from the clearance between the gate 11 and the hopper body 1 when the gate 11 is closed is suppressed to a very small amount, and the gate 11 can be rotated smoothly and surely. Can be particularly suitably used as a weighing hopper having excellent weighing accuracy.

Next, in the hopper 32 of the second example shown in FIG. 5, as compared with the first example, the radius of curvature of the convex arc surface formed on the lower end surface 6 of the side wall 2 and the position of the center O, and according to this, Since the shape of the concave arc surface of the gate 11 is different and the other structure is the same as that of the first example, the same or corresponding portions as those in FIG. 1 are designated by the same reference numerals, and the details of those portions are shown. However, the same applies to other examples below.

That is, in this example, the center O of the convex arc surface of the lower end surface 6 is set at a position directly above the center of the outlet 5 (center position in the width direction of the side wall 2). 2, which is behind the normal line YY at the rear end portion 6b of the lower end surface 6 and at the normal line XX at the front end portion 6a of the lower end surface 6.
By selecting the position of the horizontal axis P, which is the rotation center of the gate 11, in the range on the rear side with respect to the hatched side in FIG. 5, during the opening operation of the gate 11 as in the first example. Since the gate 11 rotates while being separated from the lower end surface 6 as shown by an arrow R, the opening operation can be performed smoothly and surely without the powder particles being caught.

Even in the gate closed state, the groove 12 and the abutting plate 22 suppress the spillage of the powdery particles to a very small amount as in the first example.

Next, an embodiment of the present invention will be described with reference to a third example shown in FIGS. The hopper 33 of this example is
The lower end surface 6 of the side wall 2 is formed in a flat shape inclined upward from the front wall 3 side toward the rear wall 4 side, and accordingly the gate 16 is formed.
Is a flat plate, the groove 12 provided on the upper surface of the gate 16 extends linearly, and the allowable arrangement range of the horizontal axis P which is the center of rotation of the gate 16 is partially changed as described later. However, other configurations are the same as those in the first example.

That is, when the gate 16 is opened, the gate 16 can be rotated while being separated from the lower end surface 6 of the side wall 2 without interfering with the lower end surface 6 of the side wall 2. Similarly, it is necessary to set the center of rotation behind the normal line at each point on the gate 16,
Since the gate 16 has a flat plate shape, if the horizontal axis P (center of rotation) is arranged at a position rearward of the normal line YY in the rear end portion 6b of the lower end surface 6 of the side wall, the lower end surface 6 can be obtained. The gate pivoting motion at the time of opening, which is pivoted while being separated from the lower end surface 6 without interfering with, can be obtained, and like the first example, the gate 16 can be smoothly and surely opened without the entrainment of powder particles. It is possible to perform an action.

Also in the closed state of the gate 16, as in the first example, the lower end surface 6 of the side wall 2 and the gate 16 (specifically, the bottom surface 13 of the groove 12) abut and the lower end portion of the side wall 2 is fitted. By the abutting plate 22 with which the mating groove 12 and the front end edge 16a of the gate 16 abut, the spilling of the powder or granular material is suppressed to a very small amount.

Next, in the hopper 34 of the fourth example shown in FIG. 9, the lower end surface 6 of the side wall 2 is formed in a flat shape extending in the horizontal direction as compared with the third example, and accordingly, the gate 16 is also formed. The other configurations are the same as in the third example, except that the payout opening is closed in the horizontal state.

Since the lower end surface 6 is horizontal, the lower end surface 6
The normal line YY at the rear end portion 6b is a vertical line, and the allowable placement range of the horizontal axis P is the range on the rear side of the third example. Select the position of the horizontal axis P in this range. As a result, the same smooth and reliable opening operation of the gate at the time of the gate opening operation as in the third example can be obtained, and the same spillage suppressing effect as in the third example can be obtained.

Although each of the above examples is a case where the gate is of a single-opening type, the following examples show the embodiments of the hopper having a double-opening type of gate. First, the hopper 35 of the fifth example shown in FIG. 10 and FIG. 11 is a payout outlet of a quadrangle in plan view of the lower end portion of the hopper body 8 which constitutes a side surface portion with left and right side walls 2a and 2b and a pair of end walls 7 and 7. 9 is a pair of curved plate-shaped gates 1
1, 11 open and close.

The lower end surface 6 of the side wall 2 is formed in a convex arc surface centered on a center O located directly above the center of the outlet 9, and the half of the lower end surface 6, that is, the outlet in FIG. At the respective parts on the right and left sides of the normal line X-X (the center O is on this normal line) of the lower end surface 6 in the central part,
The gates 11 and 11 having the same shape as the first example (specifically, the bottom surface 13 of the groove 12 provided on the upper surface of the gate) collide with each other to close the payout opening. That is, the portions on the right and left sides of the normal line XX in FIG. 10 have the same configuration as the portions on the right side of the normal line XX in FIG.
The horizontal axis lines P, P, which are the center of rotation of 1, also correspond to the rear end portion 6b of the lower end surface 6 of the side wall in the first example.
The position is selected so as to be in a range outside the normal YY at the outer end portion 6c and outside the normal XX, which is a range shown by hatching in FIG. Has been done.

In this example, since the gate is a double door type,
The abutting plate 22 in the first example is not provided, and instead one gate 11 (in this example, the gate 1 on the right side in FIG. 10 is used).
At the front end of 1), there is fixedly attached an overlapping piece 25 that overlaps the lower surface of the front end of the other gate 11.

As described above, the hopper 35 is a double-open type in which a pair of gate-opening type hoppers of the first example are combined and integrated, and a groove in which the bottom surface 13 abuts the lower end surface 6 of the side wall 2. With the gates 11 provided with 12 and being driven to rotate about the horizontal axis P, the same spillage of the granular material as in the first example can be suppressed and a smooth and reliable turning action of the gate at the time of opening can be obtained. Is.

Both gates 11 and 11 in the closed state
The powder particles that are about to spill out of the gap between the front end edges 11a, 11a are prevented from spilling downward because the overlapping piece 25 attached to one gate overlaps the front end portion of the other gate 11. It is. Further, even if there is a powder or granular material that has passed through the clearance G portion (see FIG. 11), the polymerized piece 25 prevents the powder or granular material from falling down.

Next, in the hopper 36 of the sixth example shown in FIGS. 12 and 13, as in the case of the fifth example, the hopper body 8 in which the side surfaces are constituted by the left and right side walls 2a and 2b and the pair of end walls 7 and 7. The lower end surface 6 of the side wall 2 of each of the gates 16 is formed into a mountain-shaped curved surface shape, and a pair of flat plate-shaped gates 16 that abut against each inclined surface portion of the lower end surface 6,
16, the payout opening 9 is opened and closed.

The lower end surface 6 of the side wall 2 is formed in the shape of a mountain-shaped bent surface that is inclined upward from the apex 10 located at the center of the outlet 9 toward the end walls 7, 7. ,
That is, in FIG. 12, the gates 16 and 16 of the same shape as the third example (specifically, the bottom surface 13 of the groove 12 provided on the upper surface of the gate) abut against the inclined surface portions on the right and left sides of the apex 10 to form the payout opening 9. Close. That is, each part on the right side and the left side of the center line T of the payout opening 9 passing through the apex 10 in FIG. 12 has the same configuration as the part on the right side of the vertical line U passing through the front end part of the lower end surface 6 in FIG. The horizontal axes P, P, which are the rotation centers of the gates 16, 16, also correspond to the rear end portion 6b of the lower end surface 6 of the side wall in the third example, and the normal line Y to the outer end portion 6c of the lower end surface 6 of the side wall. The position is selected so as to be in a range on the outer side of -Y, which is shown by hatching in FIG.

Since this example is also a double-opening type gate, the abutting plate 22 in the third example is not provided, but instead one gate 16 (in this example, the gate 1 on the right side in FIG. 12) is used.
A bent plate-shaped overlapping piece 25 that overlaps the lower surface of the front end of the other gate 16 is fixedly attached to the front end of 6).

As described above, the hopper 36 is a double-open type in which a pair of gate-opening type hoppers of the third example are combined and integrated, and the bottom surface 13 of the side wall 2 is in contact with the bottom surface 13 of the groove. With the gates 16 and 16 provided with 12 and being driven to rotate about the horizontal axis P, the same suppression of spillage of the granular material as in the third example and the smooth and reliable turning action of the gate when opened can be obtained. Is.

Both gates 16 and 16 in the closed state
The powder particles that are about to spill out from the gap between the front end edges 16a, 16a are prevented from spilling downward because the overlapping piece 25 attached to one gate overlaps the front end portion of the other gate 16. It is.

Next, the hopper 37 of the seventh example shown in FIG.
Compared to the sixth example, the lower end surface 6 of the side wall 2 is formed in a flat shape extending in the horizontal direction, and accordingly, the gate 16 also closes the outlet in the horizontal state, and the overlapping piece 2
5 is a flat plate except that the other configurations are the same as those of the sixth example, and the right and left parts of the center line T of the payout opening 9 are the lower end surfaces in FIG. 9 (fourth example). 6 has the same configuration as the portion on the right side of the vertical line U passing through the front end portion of 6.

Since the lower end surface 6 is horizontal, the lower end surface 6
The normal line YY at the outer end portion 6c of is a vertical line,
The placement allowable range of the horizontal axis P is outside the sixth example, and this point is also the same as in the fourth example.

As described above, the hopper 37 is a double-open type in which a pair of gate-opening type hoppers of the fourth example are combined and integrated, and the same spillage of powder and granules as in the fourth example is suppressed. A smooth and reliable turning action of the gate at the time of opening is obtained, and the overlapping piece 25 prevents the powder particles from spilling through the gap between the front edge 16a of the gate and the sixth example. Is the same.

In each of the above examples, the case where the upper surface of the gate is provided with the groove into which the lower end of the side wall is fitted is described. Next, the eighth example and the ninth example shown in FIGS. An embodiment in which the above groove is not provided depending on the particle size of the granules and the like will be described.

That is, the eighth shown in FIGS. 15 and 16.
The hopper 38 of the example omits the grooves 12a and 12b into which the lower ends of the side walls 2a and 2b in the hopper 31 of the first example are fitted, and the lower end surface 6 of the side walls 2a and 2b when the gate is closed,
It is adapted to abut against the upper surface of the curved plate-shaped gate 11, and other configurations are the same as in the first example. Similarly, the hopper 39 of the ninth example shown in FIGS. 17 and 18 omits the grooves 12a and 12b into which the lower ends of the side walls 2a and 2b of the hopper 33 of the third example fit, and the side wall 2a is closed when the gate is closed. , 2b are made to abut against the upper surface of the flat gate 16 and the other configurations are the same as in the third example.

In these hoppers 38 and 39, unless the powder particles are fine particles, the collision of the lower end surface 6 of the side wall 2 with the upper surface of the gate when the gate is closed is sufficient to prevent the powder particles from spilling out. The action is obtained, the first
The outer wall surface of the lower end portion of the side wall 2 and the groove 12 in the examples and the third example
The same smooth and reliable opening / closing operation of the gate as in the first and third examples, and the gate part at the time of closing, except that the gap G between The effect of preventing spillage of the powder and granules is obtained.

The grooves 12 on the upper surface of the gate can be similarly omitted in the hoppers of the second example and the fourth to seventh examples.

The present invention is not limited to the above examples, and for example, the grooves 12a and 12b provided on the upper surface of the gate.
May have a shape other than the above, such as a groove having a U-shaped cross section in which both side surfaces thereof face the lower end portions of the side wall, and depending on the particle size of the granular material to be stored, the front wall may be The abutting plate 22 provided and the overlapping piece 25 provided on the gate are
It may be omitted.

[0054]

As described above, the first, second, fourth, third, and fourth aspects are provided.
According to the invention described in 6, it is possible to open and close the gate smoothly and reliably, and it is possible to prevent spilling of the powder or granular material from the gate portion when the gate is closed.

In addition to the above effects, according to the invention of claim 3, it is possible to prevent powder particles from spilling from the gap between the front end portion and the front wall of the one-sided opening type gate when closed. Since the plate prevents the spillage of the powder and granules, it is suppressed to a much smaller amount. Further, the abutting plate can also prevent the powder or granular material from coming out from the clearance between the side wall and the gate.

In addition to the above effects, according to the invention as set forth in claim 7, the polymerized pieces prevent the granular material from spilling out from the gap between the front end edges of the double gate when closed. Therefore, the spillage of the powder or granular material is suppressed to a much smaller amount. Further, the falling of the powder or granules coming out from the gap between the side wall and the gate can be prevented by the polymerized pieces.

In addition to the above effects, according to the invention as set forth in claim 8, due to the groove fitted to the lower end portion of the side wall when the gate is closed, the spillage of the powder or granular material from the clearance between the side wall and the gate is prevented. It is suppressed to a much smaller amount.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a hopper showing a first example of an embodiment of the present invention.

FIG. 2 is a side view taken along the line AA in FIG.

FIG. 3 is an enlarged sectional view taken along line BB of FIG.

4 is a cross-sectional view taken along the line CC of FIG.

FIG. 5 is a partially cutaway front view of a hopper showing a second example of the embodiment of the present invention.

FIG. 6 is a partially cutaway front view of a hopper showing a third example of the embodiment of the present invention.

FIG. 7 is a view, corresponding to FIG. 3, showing a third example of the embodiment of the present invention.

8 is a cross-sectional view taken along the line DD of FIG.

FIG. 9 is a partially cutaway front view of a hopper showing a fourth example of the embodiment of the present invention.

FIG. 10 is a partial cutaway front view of a hopper showing a fifth example of the embodiment of the present invention.

11 is a cross-sectional view taken along the line EE of FIG.

FIG. 12 is a partially cutaway front view of a hopper showing a sixth example of the embodiment of the present invention.

13 is a sectional view taken along line FF in FIG.

FIG. 14 is a partially cutaway front view of the hopper showing the seventh example of the embodiment of the present invention.

FIG. 15 is a view, corresponding to FIG. 3, showing an eighth example of the embodiment of the present invention.

16 is a sectional view taken along line GG of FIG.

FIG. 17 is a view, corresponding to FIG. 7, showing a ninth example of the embodiment of the present invention.

18 is a sectional view taken along line HH of FIG.

FIG. 19 is a front view showing an example of a conventional hopper.

[Explanation of symbols]

1 ... Hopper body, 2a ... Side wall, 2b ... Side wall, 3 ... Front wall,
4 ... rear wall, 5 ... outlet, 6 ... lower end surface, 6a ... front end portion, 6
b ... rear end, 6c ... outer end, 7 ... end wall, 8 ... hopper body, 9 ... outlet, 10 ... vertex, 11 ... gate, 11a ...
Front edge, 12a ... Groove, 12b ... Groove, 13 ... Bottom surface, 16 ...
Gate, 16a ... Front edge, 22 ... Abutting plate, 25 ... Overlapping piece, 31 ... Hopper, 32 ... Hopper, 33 ... Hopper, 34
... hopper, 35 ... hopper, 36 ... hopper, 37 ... hopper, 38 ... hopper, 39 ... hopper, P ... Horizontal axis.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akiyuki Hayakawa             2-30, Daido-cho, Minami-ku, Nagoya-shi             Special Steel Co., Ltd. Hoshizaki Factory F-term (reference) 3E070 AA19 AB11 GA11 HA05 HA07                       HB08 HB09 HD01 VA30                 3F075 AA08 BA01 BB01 CA09 CB03                       CD12

Claims (8)

[Claims] 1. A hopper body having a lower end with a quadrangular outlet in a plan view, which is surrounded by left and right side walls, a front wall and a rear wall, and the rear wall which is rotatably driven around a horizontal axis when closed. In a hopper having a single-opening type gate for opening and closing the outlet opening that rotates from the side toward the front wall side, the lower end surface of the side wall is formed in a convex arc surface shape, and the lower end surface at the time of closing. A curved plate-shaped gate having a concave arc surface portion that abuts against is freely rotatable around a horizontal axis that is arranged at a position rearward of each normal line at the rear end and the front end of the lower end surface of the side wall. A hopper characterized by being supported by. 2. A hopper body having a lower end portion with a discharge opening having a quadrangular shape in plan view surrounded by left and right side walls, a front wall and a rear wall, and the rear wall which is driven to rotate about a horizontal axis during a closing operation. In a hopper having a single-opening type gate for opening and closing the outlet, which is rotated from the side toward the front wall, the lower end surface of the side wall is formed into a flat shape, and the lower end surface collides with the lower end surface when closed. It is characterized in that a flat plate-shaped gate having a flat portion to be fitted is rotatably supported around a horizontal axis line arranged at a position rearward of a normal line at a rear end portion of the lower end surface of the side wall. Hopper. 3. The hopper according to claim 1, further comprising an abutting plate provided at a lower end portion of the front wall, with which a front end edge of the gate comes into contact when the front wall is closed. 4. A hopper body having a lower end portion with a discharge opening of a quadrangular shape in plan view surrounded by left and right side walls and a pair of end walls, and the end wall side which is driven to rotate about a horizontal axis during a closing operation. In a hopper provided with a double-opening type gate for opening and closing the outlet, which rotates toward the center of the outlet, the lower end surface of the side wall is formed into a convex arc surface shape, and the lower end surface is closed at the time of closing. A pair of curved plate-shaped gates having a concave arc surface portion that abuts the half of the horizontal axis line at a position outside each normal line at the outer end of the lower end face of the side wall and the center of the outlet. A hopper that is rotatably supported on each of the two. 5. A hopper body having a lower end portion with a discharge opening of a quadrangular shape in plan view surrounded by left and right side walls and a pair of end walls, and the end wall side when driven to rotate about a horizontal axis during a closing operation. From the hopper provided with the double-opening type gate for opening and closing the outlet, which rotates toward the center of the outlet, the lower end surface of the side wall is apex located at the center of the outlet. A pair of flat plate-shaped gates, each of which is formed in a mountain-shaped curved surface inclined upward toward each end wall and has a flat portion that abuts with half of the lower end surface when closed, and an outer end portion of the lower end surface of the side wall. A hopper that is rotatably supported around a horizontal axis that is arranged at a position outside each normal line in FIG. 6. A hopper body having a lower end portion having a discharge opening of a quadrangle in plan view surrounded by left and right side walls and a pair of end walls, and the end wall side when driven to rotate about a horizontal axis during a closing operation. In a hopper having a double-opening type gate for opening and closing the outlet, which rotates toward the center of the outlet, the lower end surface of the side wall is formed in a flat shape, and half of the lower end surface is closed when closed. A pair of flat plate-shaped gates having flat portions that butt against each other are rotatably supported around a horizontal axis arranged at a position outside each normal at the outer end of the lower end surface of the side wall. A hopper characterized by that. 7. The overlapped piece is provided at the front end of one of the pair of gates so as to overlap the lower surface of the front end of the other gate when the gate is closed.
The stated hopper. 8. The hopper according to claim 1, wherein the upper surface of the gate is provided with a groove into which the lower end of the side wall is fitted when the gate is closed.