Installation structure of shutter device and shutter device

Abstract

The downstream end of a first conveyor (C1) that passes through a wall opening (A1) is inserted into a box body (10) from a side opening (A2), and the upstream end of a second conveyor (C2) is positioned below the box body (10). Since the wall opening (A1) and the side opening (A2) are coupled by a covering body, when a conveyed object is not transferred from the first conveyor (C1) to the second conveyor (C2), the wall opening (A1) can be closed by closing the bottom surface portion of the box body (10) with a shutter plate (30).

Description

Shutter device installation structure and shutter device

[0001] The present invention relates to a shutter device installation structure in which a shutter device for opening and closing a wall opening is installed near the wall opening through which a conveyor passes, and to the shutter device itself.

[0002] In large-scale poultry farming facilities, various conveyors are used, such as belt conveyors for transporting the excrement (chicken manure) of caged birds, plate conveyors for transporting and drying the manure, and bar conveyors for transporting eggs produced by caged birds. These conveyors are sometimes arranged to pass through multiple spaces separated by walls. In other words, conveyors are sometimes used to pass through openings in the walls.

[0003] In such cases, it is desirable to close the wall opening when the conveyor is not in use (when the conveyor is stopped). In particular, in the case of an opening in a wall separating the interior space from the exterior space of a building, there is a high risk of small animals such as mice entering the building through the wall opening, so there is a strong need to close the wall opening when the conveyor is not in use.

[0004] Therefore, the present applicant has proposed several shutter devices that can open and close a wall opening when a conveyor passes through the wall opening (see Patent Documents 1 to 3). Patent Documents 1 and 2 propose a shutter device that is positioned in the wall opening through which a bar conveyor passes, and a plate-shaped shutter is inserted from above between adjacent bars of the bar conveyor, thereby closing the space above the conveyor bar in the wall opening.

[0005] In the invention of Patent Document 3, a frameless space is created in a part of the frame of a belt conveyor, where there are no side bars and only an endless belt.The belt conveyor is then positioned so that the frameless space is adjacent to an opening in the wall, and a shutter device with upper and lower shutters is installed in the frameless space.The shutter device uses the "flexibility" of the belt to close the opening in the wall by sandwiching the conveying belt and return belt between the upper and lower shutters while they are overlapping.

[0006] In this way, the shutter devices of Patent Documents 1 to 3 can close the wall opening through which the conveyor passes when the conveyor is not in use. The applicant has continued to study other means for opening and closing the wall opening through which the conveyor passes. In particular, the shutter devices in the above prior art are dedicated to specific types of conveyors, such as bar conveyors or belt conveyors, but it is desirable to be able to open and close the wall opening regardless of the type of conveyor.

[0007] Patent No. 6472542 International Publication No. WO2023 / 079624 Pamphlet International Publication No. W2022 / 234653 Pamphlet

[0008] Therefore, in view of the above-mentioned circumstances, the present invention aims to provide an installation structure for a shutter device in which a shutter device capable of opening and closing a wall opening through which a conveyor passes, regardless of the type of conveyor, is installed near the wall opening, and to provide a shutter device that is a component of the installation structure.

[0009] In order to solve the above-mentioned problems, the installation structure for a shutter device according to the present invention is as follows: "An installation structure for a shutter device, in which the upstream end of the second conveyor is located below the downstream end of the first conveyor in order to transfer conveyed objects from a first conveyor to a second conveyor, and a shutter device for opening and closing a wall opening through which the first conveyor passes is installed in the vicinity of the wall opening, the shutter device comprising: a rectangular parallelepiped box body consisting of a top surface portion, a bottom surface portion, and four side surfaces; and a support body that stands upright from an installation surface and supports the box body so that the bottom surface portion is located above the upstream end of the second conveyor; the box body has a side opening formed in one of the four side surfaces and a shutter plate that opens and closes the bottom surface; the top surface portion and the other three of the four side surfaces are each closed by a closing body, and the entire periphery of the side opening and the entire periphery of the wall opening are connected by a covering body, The shutter plate, the closing body, and the covering body are each a mesh body, a plate body, or a sheet body, the downstream end of the first conveyor that has passed through the wall opening is inserted into the inside of the box body from the side opening, and when the first conveyor and the second conveyor are operating, the shutter plate opens the bottom portion, while when the first conveyor and the second conveyor are stopped, the shutter plate closes the bottom portion.

[0010] After a conveyor passes through a wall opening, it is often necessary to transfer the objects from that conveyor to another conveyor. This is because a very long conveyor is difficult to manufacture, transport, and install. Also, after a conveyor passes through a wall opening, it is often necessary to change the direction of conveyance. This invention utilizes the transfer of objects between two conveyors to open and close a wall opening through which one conveyor passes.

[0011] The shutter device includes a box body consisting of a top surface, a bottom surface, and four side surfaces. The downstream end of the first conveyor, which passes through the wall opening, is inserted into the box body through the side opening of the box body. The top surface and three side surfaces of the box body, excluding the side surface on which the side opening is formed, are closed. The entire periphery of the side opening and the entire periphery of the wall opening are connected by a covering body. This allows the wall opening to communicate with the interior space of the box body.

[0012] Therefore, by closing the bottom surface of the box body with the shutter plate (closed state), the internal space of the box body becomes a closed space, and the wall opening can be closed. On the other hand, by opening the bottom surface of the box body with the shutter plate, the wall opening can be opened through the internal space of the box body. In other words, by opening and closing the bottom surface of the box body with the shutter plate, the wall opening can be opened and closed.

[0013] Furthermore, according to this configuration, unlike the shutter devices of Patent Documents 1 to 3, the wall opening is not closed using the structure of the conveyor that penetrates the wall opening itself, so the wall opening through which the conveyor penetrates can be opened and closed regardless of the type of conveyor.

[0014] Here, the "rectangular parallelepiped" shape of the box body includes a cube.

[0015] Of the mesh, plate, and sheet bodies that make up the "shutter plate," "closure," and "covering body," the "mesh" can be a metal mesh or a resin mesh. The "plate" can be a metal plate, a resin plate, or a wooden plate. Of these, the resin plate can be a laminated plate in which a core layer made of foamed resin is sandwiched between highly rigid surface layers, such as polypropylene. Furthermore, the wooden plate can be made of a single sheet of wood, or a plywood made by laminating multiple thin sheets of wood, or a particle board made by compressing small pieces of wood. Furthermore, the sheet can be made of a resin sheet, a woven fabric, or a nonwoven fabric.

[0016] It should be noted that the shutter plate, the closing body and the covering body may each be a mesh body, and therefore the "closed state" also includes a state in which air flows through these members.

[0017] Next, the shutter device of the present invention comprises "a box body having a rectangular parallelepiped shape consisting of a top surface, a bottom surface, and four side surfaces; and a support body that stands upright from an installation surface and supports the box body, the box body having a side opening formed in one of the four side surfaces and a shutter plate that opens and closes the bottom surface, the top surface and the other three of the four side surfaces are each closed by a closing body, and the shutter plate and the closing body are each made of a mesh body, a plate body, or a sheet body."

[0018] This is the configuration of the shutter device in the shutter device installation structure described above.

[0019] In addition to the above configuration, the shutter device of the present invention can be configured as follows: "The box body has a rectangular parallelepiped frame formed of a plurality of bar members, the shutter plate opens and closes the bottom portion by sliding along the frame, and among the plurality of bar members, the bar members extending in a direction perpendicular to the sliding direction of the shutter plate come into contact with the inner surface of the shutter plate as the shutter plate slides."

[0020] Examples of "bar material" include angles and square pipes with an L-shaped cross section. The material of the bar material is not particularly limited and can be made of metal, resin, or wood, but if it is made of metal, stainless steel is preferred because it can improve rust resistance.

[0021] Depending on the object being transported by the conveyor, when the first conveyor is stopped and the bottom of the box body is closed by the shutter plate, the object may fall from the downstream end of the first conveyor and adhere to the shutter plate. With this configuration, the bar members extending in a direction perpendicular to the sliding direction of the shutter plate come into contact with the inner surface of the shutter plate as the shutter plate slides, and therefore act as scrapers. Therefore, by simply sliding the shutter plate, any adhering matter on the inner surface of the shutter plate can be easily scraped off.

[0022] In addition to the above configuration, the shutter device of the present invention can be configured such that "at least one of the top surface portion and the three side surface portions, the closure body is a movable plate that slides along the frame, and among the plurality of bar members, a bar member that extends in a direction perpendicular to the sliding direction of the movable plate comes into contact with the inner surface of the movable plate as the movable plate slides."

[0023] According to this configuration, the closing body is a movable plate that slides along the frame on the top surface of the box body of the shutter device and on at least one of the three side surfaces that do not have a side opening. Therefore, the box body can be opened simply by sliding the movable plate. Therefore, the internal space can be accessed from the outside of the box body through the location where the movable plate is slid, making it easy to clean the inside of the box body, for example.

[0024] Furthermore, some objects transported by the conveyors may fall off the first conveyor and be transferred to the second conveyor, scattering around and adhering to the inner surface of the closure that closes the top and side sections. According to this configuration, the bar members that extend in a direction perpendicular to the sliding direction of the movable plate that constitutes at least a part of the closure contact the inner surface of the movable plate as the movable plate slides. Therefore, the bar members act as scrapers, and objects adhering to the inner surface of the movable plate can be easily scraped off simply by sliding the movable plate.

[0025] As described above, according to the present invention, it is possible to provide an installation structure for a shutter device in which a shutter device capable of opening and closing a wall opening through which a conveyor passes, regardless of the type of conveyor, is installed near the wall opening, and it is possible to provide a shutter device that is a component of the installation structure.

[0026] Fig. 1 is a perspective view showing a closed state of an installation structure for a shutter device according to a first embodiment of the present invention. Fig. 2 is a view in which a top plate, a side plate, and a cover are omitted from the perspective view of Fig. 1. Fig. 3 is a perspective view illustrating an open state of the installation structure for the shutter device of Fig. 1. Fig. 4 is a perspective view illustrating sliding of the shutter plate, the side plate, and the top plate of the installation structure for the shutter device of Fig. 1. Fig. 5 is a side view showing an installation structure for a shutter device according to a second embodiment of the present invention, with part of the side plate omitted.

[0027] The installation structure of shutter devices 1 and 1b, which are specific embodiments of the present invention, and the shutter devices 1 and 1b will be described below with reference to the drawings. First, the shutter device 1 of the first embodiment and its installation structure will be described with reference to Figs. 1 to 4. The installation structure of the shutter device 1 includes a first conveyor C1, a second conveyor C2, and the shutter device 1. Hereinafter, the conveying direction of the first conveyor C1 will be referred to as the "front-rear direction," and the direction perpendicular to the front-rear direction and parallel to the conveying surface of the first conveyor C1 will be referred to as the "left-right direction."

[0028] Here, the first conveyor C1 and the second conveyor C2 are belt conveyors that transport chicken manure, which is the object to be transported, in a chicken coop. As shown in Figure 2, the first conveyor C1 passes through a wall opening A1 provided in a wall W, and the downstream end of the first conveyor C1 is located near the wall opening A1.

[0029] The second conveyor C2 is a belt conveyor that receives the objects transported by the first conveyor C1 from the first conveyor and transports them further. As shown in FIG. 2 , the upstream end of the second conveyor C2 is located below the downstream end of the first conveyor C1. Here, the second conveyor C2 is illustrated as being inclined upward toward the downstream side, but this is not limited thereto, and the second conveyor may be a conveyor that transports the objects horizontally. Also, here, the case is illustrated in which the transport direction of the second conveyor C2 is perpendicular to the transport direction of the first conveyor C1, but this is not limited thereto, and the transport direction of the second conveyor C2 may be the same as the transport direction of the first conveyor C1.

[0030] The shutter device 1 includes a box body 10 and a support body 20. The box body 10 includes a rectangular parallelepiped frame and has six surfaces surrounded by the frame, namely, a top surface, a bottom surface, and four side surfaces.

[0031] As shown in FIG. 2 , this frame consists of four vertical members 11, four horizontal members 12, and four cross members 13. Each vertical member 11 extends vertically, and two pairs of vertical members 11, one spaced apart in the left-right direction, are spaced apart in the front-to-rear direction. The horizontal members 12 consist of two horizontal members 12 connecting the upper ends of each of the four vertical members 11 in the front-to-rear direction and two horizontal members 13 connecting the four vertical members 11 in the front-to-rear direction below the vertical members 11. The horizontal members 13 consist of two horizontal members 13 connecting the upper ends of each of the four vertical members 11 in the left-to-rear direction and two horizontal members 13 connecting the four vertical members 11 in the left-to-rear direction below the horizontal members 12. Here, the vertical members 11, the horizontal members 12, and the horizontal members 13 correspond to the “bar members” in the present invention. In this embodiment, angle members with an L-shaped cross section are used as the vertical members 11, the horizontal members 12, and the horizontal members 13, but this is not limited thereto. For example, square pipes could also be used.

[0032] The box body 10 has a side opening A2 formed in one of its four side surfaces. The other three side surfaces, which do not have the side opening A2, are closed by side plates 32. The box body 10 also has a top plate 31 that closes the top surface. The side plate 32 and the top plate 31 are each made of a mesh, plate, or sheet. The side plate 32 and the top plate 31 correspond to the "closure" of the present invention.

[0033] The box body 10 further includes a shutter plate 30 that opens and closes the bottom portion. As shown in FIG. 3 , a flat guide bar 15 is provided along the underside of each pair of opposing horizontal members 13 of the four horizontal members 12, 13 that make up the bottom portion. A gap slightly larger than the thickness of the shutter plate 30 is formed between the horizontal members 13 and the guide bar 15. The shutter plate 30 is held in this gap, thereby closing the bottom portion (closed state), as shown in FIG. 2 . Sliding the shutter plate 30 within this gap opens the bottom portion (open state), as shown in FIG. 3 . Note that while the top plate 31, side plate 32, and cover J are omitted in FIG. 3 , in the actual open state, at least the cover J connects the entire periphery of the wall opening A1 and the side opening A2.

[0034] When the shutter plate 30 slides along the cross member 13, the inner surface of the shutter plate 30 abuts against the cross member 12 perpendicular to the sliding direction. As a result, even if something is attached to the inner surface of the shutter plate 30, the cross member 12 acts as a scraper and scrapes off the attachment. Note that although the example shown here is one in which the guide bar 15 is provided along the cross member 13, the guide bar 15 may also be provided along a pair of cross members 12. In this case, the shutter plate 30 slides along the cross member 12, and the cross member 13 acts as a scraper.

[0035] The shutter plate 30 may be slid manually. Alternatively, a drive mechanism for sliding the shutter plate 30 may be provided in the shutter device 1. This drive mechanism may be a mechanism in which a feed screw is advanced and retreated by the forward and reverse rotation of a motor, and the movement is transmitted to the shutter plate 30. Alternatively, a cylinder device that advances and retreats a piston rod using air or oil may be used, and the movement of the piston rod may be transmitted to the shutter plate 30.

[0036] In this embodiment, in addition to the shutter plate 30, the top plate 31 and three side plates 32 also slide along the frame. That is, the top plate 31 and the side plates 32 correspond to the "movable plates" of the present invention. The configuration for sliding the top plate 31 is similar to the configuration for sliding the shutter plate 30. Specifically, as shown in FIG. 4 , of the four horizontal members 12, 13 that make up the top surface, a flat guide bar 15 is provided along the upper surface of each pair of opposing horizontal members 13, and a gap slightly larger than the thickness of the top plate 31 is formed between the horizontal members 13 and the guide bar 15. The top plate 31 is held in this gap, closing the top surface, and the top plate 31 can slide within this gap. Alternatively, the guide bar 15 may be provided along the pair of horizontal members 12 to allow the top plate 31 to slide along the horizontal members 12.

[0037] Furthermore, on each of the three side sections where the side plates 32 are provided, a flat guide bar 16 is provided along the outer surface of a pair of upper and lower cross members (cross members 12 or 13). The side plate 32 is held in the gap between the cross member and the guide bar 16, thereby closing the side section, and the side plate 32 can slide within this gap. Note that, in this example, the guide bar 16 is shorter than the cross member, and multiple guide bars 16 are provided along one cross member, but the length of the guide bar 16 may be approximately equal to the length of the cross member.

[0038] The sliding direction of the side plate 32 may be vertical by providing a guide bar 16 along the outer surface of the vertical member 11 .

[0039] Furthermore, when the shutter plate 30, the side plate 32 which is a movable plate, and the top plate 31 are made of sheets, that is, when the sliding plates are made of sheets, it is advisable to apply tension to the sheets by holding them in a frame.

[0040] As when the shutter plate 30 is slid, when the top plate 31 and the side plate 32 are slid, the horizontal members or vertical members extending in a direction perpendicular to the sliding direction act as scrapers.

[0041] In addition, the shutter plate 30, the top plate 31, and the three side plates 32 can be easily removed from the box body 10 by simply sliding them. Therefore, for example, the inside of the box body 10 can be easily cleaned.

[0042] The support 20 supports the box body 10 on the installation surface so as to form a space below the bottom of the box body 10 where the upstream end of the second conveyor C2 can be located. In this embodiment, the support 20 is a support column extending from each of the four vertical members 11, and has a male thread formed on its outer periphery. The vertical members 11 extend downward from the bottom, with a horizontal portion 14 at their lower ends. The horizontal portion 14 has a hole formed in it, and the support 20 penetrates the hole, and a nut is fastened to sandwich the horizontal portion 14, connecting the vertical member 11 and the support 20. The height of the box body 10 from the installation surface can be adjusted by adjusting the fastening position of the horizontal portion 14 relative to the support 20. Note that if the height of the box body 10 does not need to be adjusted, the support can also be formed by the portion of the vertical member 11 itself extending downward from the bottom.

[0043] Although the support 20 is illustrated as a support pillar here, any structure may be used that forms a space below the bottom surface of the box body 10 for positioning the upstream end of the second conveyor C2. For example, the support may be formed of two plates spaced apart from each other and erected from the installation surface, with the upstream end of the second conveyor C2 positioned between the two plates. Alternatively, the support may be formed of a structure in which the ends of the same side of the two plates are connected by a third plate erected from the installation surface, with the upstream end of the second conveyor C2 positioned in the space surrounded by the three plates.

[0044] Next, we will explain how to use the shutter device 1. As shown in Figure 2, the shutter device 1 is installed so that the bottom surface of the box body 10 is located above the upstream end of the second conveyor C2. The downstream end of the first conveyor C1, which has passed through the wall opening A1, is inserted through the side opening A2 and positioned inside the box body 10.

[0045] In this installation structure, the side opening A2 and the wall opening A1 of the box body 10 face each other. As shown in Fig. 1, the entire periphery of the side opening A2 and the entire periphery of the wall opening A1 are connected by a covering body J. Here, the covering body J is illustrated as a mesh body, but it may also be a sheet body or a plate body.

[0046] Although belt conveyors are illustrated as the first conveyor C1 and the second conveyor C2 here, any type of conveyor can be used, such as a bar conveyor or a plate conveyor.

[0047] When the first conveyor C1 and the second conveyor C2 are stopped (not in use), as shown in Fig. 1, the bottom, top, and three side surfaces of the box body 10 that do not have the side opening A2 are closed by the shutter plate 30, top plate 31, and side plate 32, respectively. In this state, the internal space of the box body 10 that communicates with the wall opening A1 is closed. Therefore, the wall opening A1 can be closed via the box body 10.

[0048] When the first conveyor C1 and the second conveyor C2 are operated and an object is transferred from the first conveyor C1 to the second conveyor C2, the shutter plate 30 is slid and removed from the box body 10 to open the bottom, as shown in Figure 3. The object transported by the first conveyor C1 falls from the downstream end of the first conveyor C1, is placed on the upstream end of the second conveyor C2, and is further transported by the second conveyor C2.

[0049] Next, the installation structure of a shutter device 1b according to a second embodiment of the present invention and the shutter device 1b will be described with reference to Fig. 5. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0050] The second embodiment differs from the first embodiment in that the drive mechanism 40 that slides the shutter plate 30b is held by the second conveyor, and the second conveyor C2 is inclined, so that the shutter plate 30b is inclined parallel to the conveying surface of the second conveyor C2.

[0051] The drive mechanism 40 rotates the feed screw 43 forward and reverse by forward and reverse rotation of the motor 41. The motor 41 is attached to the second conveyor C2 by a motor support 42 so that the output shaft extends parallel to the inclination direction of the second conveyor C2 and extends toward the box main body 10b.

[0052] A nut 44 is threaded onto the feed screw 43. A stopper 45 that restricts the rotation of the nut 44 is fixed to the nut 44. As a result, when the feed screw 43 is rotated forward or backward by the motor 41, the nut 44 advances or retreats along the feed screw 43 without rotating. Therefore, if the nut 44 with the stopper 45 is fixed to the end of the shutter plate 30b, the shutter plate 30b will slide along the feed screw 43.

[0053] Because the drive mechanism 40 is configured as described above, the box body 10b needs to be configured so that the shutter plate 30b can slide parallel to the inclination direction of the second conveyor C2. Therefore, in the box body 10b, of the cross members 12 and 13 that form the bottom surface, the cross member that extends in the sliding direction of the shutter plate 30b (here, the cross member 12) is fixed to the vertical member 11 so as to be parallel to the inclination direction of the second conveyor C2.

[0054] With this configuration, when the motor 41 rotates the feed screw 43 in one direction, the non-rotatable nut 44 moves along the feed screw 43 to the downstream side of the second conveyor C2, causing the shutter plate 30b to slide and opening the bottom of the box body 10b. When the motor 41 rotates the feed screw 43 in the opposite direction, the nut 44 moves along the feed screw 43 to the upstream side of the second conveyor C2, causing the shutter plate 30b to slide and closing the bottom of the box body 10b.

[0055] If the second conveyor C2 is inclined and the shutter plate is horizontal, the shutter plate must slide in a direction that does not interfere with the second conveyor C2. For example, the shutter plate must slide toward the outside of the box body in a direction perpendicular to the extension direction of the second conveyor C2. In this case, in addition to the space for installing the second conveyor C2 and the box body, space for sliding the shutter plate is required around the box body. Furthermore, if the shutter plate that slides in this direction is driven by a drive mechanism, additional space for installing the drive mechanism is required outside the box body.

[0056] In contrast, in the second embodiment, the shutter plate 30b slides along the conveying direction of the second conveyor C2, so no space is required just for sliding the shutter plate 30b, and space can be saved. Therefore, the second embodiment is suitable for cases where the space around the box body 10b is narrow.

[0057] Furthermore, although it is difficult to manually slide the shutter plate 30b in the transport direction of the second conveyor C2, in the second embodiment, sliding in this direction is realized by a drive mechanism 40 held by the second conveyor C2. Note that even if a cylinder device that moves a piston rod back and forth is used as the drive mechanism instead of the drive mechanism 40 that rotates the feed screw 43 with the motor 41, the shutter plate 30b can be moved back and forth in the transport direction of the second conveyor C2.

[0058] Here, we have shown an example in which the conveying direction by the second conveyor C2 is the same as the conveying direction by the first conveyor C1, but this is not limited to this, and the conveying direction by the second conveyor may be perpendicular to the conveying direction by the first conveyor.

[0059] The present invention has been described above by citing preferred embodiments, but the present invention is not limited to the above embodiments, and various improvements and design changes are possible as described below, without departing from the spirit of the present invention.

[0060] For example, although the above example illustrates a case where the first conveyor C1 and the second conveyor C2 are used in a poultry house, the present invention can also be applied to facilities other than poultry houses. Also, although the example illustrates a case where the transported object is chicken manure, the transported object can be any object that does not have a problem with falling a certain height when transferred from the first conveyor C1 to the second conveyor C2.

[0061] In the above, the case where the conveying direction of the second conveyor C2 is perpendicular to the conveying direction of the first conveyor C1 and the case where the conveying direction of the second conveyor C2 is the same as the conveying direction of the first conveyor C1 are exemplified. However, the conveying direction of the second conveyor C2 can be set to a direction that intersects the conveying direction of the first conveyor C1 at an angle other than a right angle by increasing the distance between the supports to avoid interference between the supports and the second conveyor C2.

[0062] In addition, in the above example, when the shutter plate slide is driven by a motor, the output shaft of the motor 41 directly rotates the feed screw 43. However, the present invention is not limited to this, and the output shaft and the feed screw 43 may be parallel to each other, and the rotation of the output shaft may be transmitted to the feed screw via a pulley and a belt or a sprocket and a chain.

Claims

1. To transfer the object to be conveyed from the first conveyor to the second conveyor, the upstream end of the second conveyor is located below the downstream end of the first conveyor, and a shutter device for opening and closing a wall opening through which the first conveyor passes is installed in the vicinity of the wall opening. The installation structure of the shutter device is as follows: The shutter device includes a box body having a rectangular parallelepiped shape composed of a top surface portion, a bottom surface portion, and four side surface portions, and a support body that stands upright from the installation surface to support the box body so that the bottom surface portion is located above the upstream end of the second conveyor. The box body has a side opening formed in one of the four side surface portions and a shutter plate for opening and closing the bottom surface portion. The top surface portion and the other three of the four side surface portions are each closed by a closing body, and the entire peripheral edge of the side opening and the entire peripheral edge of the wall opening are connected by a covering body. The shutter plate, the closing body, and the covering body are each a net body, a plate body, or a sheet body. The downstream end of the first conveyor passing through the wall opening is inserted into the box body through the side opening, and when the first conveyor and the second conveyor are operating, the shutter plate keeps the bottom surface portion in an open state, while when the first conveyor and the second conveyor are stopped, the shutter plate keeps the bottom surface portion in a closed state. The installation structure of the shutter device is characterized by the above.

2. A shutter device characterized by comprising a box body having a rectangular parallelepiped shape composed of a top surface portion, a bottom surface portion, and four side surface portions, and a support body that stands upright from the installation surface to support the box body. The box body has a side opening formed in one of the four side surface portions and a shutter plate for opening and closing the bottom surface portion. The top surface portion and the other three of the four side surface portions are each closed by a closing body, and the shutter plate and the closing body are each composed of a net body, a plate body, or a sheet body.

3. The box body has a rectangular parallelepiped-shaped frame formed of a plurality of bar members, and the shutter plate opens and closes the bottom surface portion by sliding along the frame. Among the plurality of bar members, a bar member extending in a direction orthogonal to the sliding direction of the shutter plate comes into contact with the inner surface of the shutter plate as the shutter plate slides. The shutter device according to claim 2, characterized in that.

4. In at least one of the top surface portion and the three side surface portions, the closing body is a movable plate that slides along the frame. Among the plurality of bar members, a bar member extending in a direction orthogonal to the sliding direction of the movable plate comes into contact with the inner surface of the movable plate as the movable plate slides. The shutter device according to claim 3, characterized in that.

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