Shutter opening / closing mechanism of lower screw conveyer in grain dryer

Abstract

To provide a shutter opening / closing mechanism of a grain conveyer in a grain dryer, the mechanism having a simple structure and being capable of effectively suppressing grain leakage.SOLUTION: A lower screw conveyer shutter opening / closing mechanism in a grain dryer comprises: a lower screw closing shutter 52 having a closing unit 523 that engages one end of the lower screw closing shutter 52 rotatably with a shutter locking unit 56, and that abuts a first lower opening end 5011 near the shutter locking unit 56 and a second lower opening end 5012 opposing the first lower opening end 5011 when the lower opening 50 is closed; and a closing shutter supporting arm 53 having an abutting corner 531 that abuts and presses the closing unit 523 when the lower opening 50 is closed. The abutting position of the abutting corner 531 with respect to the closing unit 523 is positioned in a range outside a vertical line of the second lower opening end 5012.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a grain conveying device in a grain dryer, specifically to a shutter opening and closing mechanism that can open and close the lower part of a lower screw conveyor.

Background Art

[0002] As a shutter mechanism for cleaning the lower screw conveyor of a conventional grain dryer, for example, Patent Document 1 discloses an invention aimed at suppressing deformation of an opening and closing shutter to prevent leakage of grains, reducing the length of a support tool, and making the overall height of the grain dryer low and compact.

[0003] Specifically, in a structure provided with an opening and closing shutter and a support tool that supports the opening and closing shutter from below, one end side of the support tool is provided on a rotating lever shaft. Further, in order to press the bottom of the opening and closing shutter, the other end of the support tool is arranged, and a detent mechanism for preventing the rotation of the support tool is provided at a position where the support tool is rotated slightly beyond the vertical state.

[0004] In addition, the support tool is characterized in that a protrusion having an inclined surface is provided so that the opening and closing shutter can easily move in the closing direction.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the shutter mechanism described in Patent Document 1, as shown in FIG. 1, in the cleaning opening (residual grain discharge port 34) of the lower screw (screw conveyor 30), curved portions 36 having a circular cross-section are provided on the left and right for preventing grain leakage and reinforcement, and a ridge portion 46 is also provided on the opening / closing shutter (stopper 60). Therefore, when the vicinity of the left and right centers (near the ridge portion 46) at the bottom of the opening / closing shutter (stopper 60) is supported by the support tool 48, there is a possibility that both left and right end sides of the opening / closing shutter (stopper 60) may bend and deform. If so, both left and right end sides of the opening / closing shutter (stopper 60) will bend and become a cause of grain leakage.

[0007] In view of the above problems, an object of the present invention is to provide a shutter opening / closing mechanism for a grain conveying device for grains in a grain dryer, which can effectively suppress grain (grain) leakage while configuring a shutter opening / closing mechanism with a simple structure.

Means for Solving the Problems

[0008] The present invention is a shutter opening / closing mechanism for a lower screw conveyor in a grain dryer having at least a grain storage section and a grain drying section, the shutter opening / closing mechanism including: a lower screw opening / closing shutter capable of opening or closing a lower opening located below the lower screw conveyor; and an opening / closing shutter support arm capable of pressing the lower screw opening / closing shutter to close the lower opening with the lower screw opening / closing shutter. The lower screw opening / closing shutter engages one end of the lower screw opening / closing shutter rotatably with a shutter locking portion, and includes a closing portion that abuts against a first lower opening end near the shutter locking portion and a second lower opening end facing the first lower opening end when the lower opening is closed. The opening / closing shutter support arm includes a contact corner portion that abuts against and presses the closing portion when the lower opening is closed, and a contact position of the contact corner portion with respect to the closing portion is located in a range outside the vertical line of the second lower opening end. It is a shutter opening / closing mechanism for a lower screw conveyor in a grain dryer.

[0009] Furthermore, in the present invention, the lower screw opening / closing shutter includes a standing portion that stands upright from the left and right end portions of the closing portion toward the lower opening inclined portion, and an inclined contact portion that extends upward along the lower opening inclined portion from the upper end portion of the standing portion. The present invention relates to a shutter opening / closing mechanism of a lower screw conveyor in a grain dryer, characterized by the above structure.

Advantages of the Invention

[0010] According to the present invention, by bringing the contact corner portion of the opening / closing shutter support arm into contact with the closing portion in the range outside the vertical line of the second lower opening end portion, it is possible to suppress the closing portion of the lower screw opening / closing shutter from plastically deforming convexly due to the weight of the grain as in the prior art, and effectively prevent the grain from leaking from both end portions of the lower screw opening / closing shutter.

[0011] Furthermore, by providing a standing portion that stands upright from the left and right end portions of the closing portion of the lower screw opening / closing shutter toward the lower opening inclined portion, and an inclined contact portion that extends upward along the lower opening inclined portion from the upper end portion of the standing portion, when the closing portion plastically deforms concavely due to the weight of the grain, the inclined contact portion presses the lower opening inclined portion, and it is possible to more effectively prevent the grain from leaking from both end portions of the lower screw opening / closing shutter.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Needless to say, the present invention is not limited to the embodiments.

[0014] FIG. 2 shows a schematic cross-sectional view of the front of the grain dryer 1 according to the present embodiment, and FIG. 3 shows a schematic cross-sectional view of the side of the grain dryer. As shown, the grain dryer 1 of the present embodiment includes at least a grain storage section 2 and a grain drying section 3, and at the center of the lower part of the grain dryer 1, there is provided a grain conveying device 5 capable of conveying grains to the elevating machine 4 by the lower screw conveyor 51.

[0015] Then, the grains charged into the grain storage section 2 flow down to the grain drying section 3 and are dried by hot air. The grains that have flowed down through the grain drying section 3 are conveyed to the elevating machine 4 connected to the end portion in the conveying direction of the grain conveying device 5 and are elevated above the grain storage section 2.

[0016] Subsequently, FIG. 4 shows a perspective view of the above-described grain conveying device 5. As shown, below the lower screw conveyor 51, a lower screw opening / closing shutter 52 for discharging the grains staying at the lower part of the lower screw conveyor 51 is provided so as to be openable and closable, and further, an opening / closing shutter support arm 53 for opening and closing the lower screw opening / closing shutter 52 is arranged.

[0017] FIG. 5 shows a cross-sectional view of the lower screw opening / closing shutter 52 in an open state, and FIG. 6 shows a cross-sectional view of the lower screw opening / closing shutter 52 in a closed state. As shown in the drawings, the shutter opening / closing mechanism of the present embodiment includes a lower screw opening / closing shutter 52 capable of opening or closing a lower opening 50 located below the lower screw conveyor 51, and an opening / closing shutter support arm 53 capable of pressing the lower screw opening / closing shutter 52 to close the lower opening 50 with the lower screw opening / closing shutter 52.

[0018] And one end (right side in the drawing) of the lower screw opening / closing shutter 52 is rotatably engaged with a shutter locking portion 56. As shown in the enlarged view of part A in FIG. 5, a locking piece 524 formed at the right end of the lower screw opening / closing shutter 52 is locked to a locking member 561 of the shutter locking portion 56, whereby the lower screw opening / closing shutter 52 is configured to be rotatable.

[0019] Also, as shown in the enlarged cross-sectional view showing the closed state of the lower screw opening / closing shutter 52 in FIG. 7, the lower screw opening / closing shutter 52 includes a closing portion 523 that abuts against a first lower opening end 5011 close to the shutter locking portion 56 and a second lower opening end 5012 facing the first lower opening end 5011 when the lower opening 50 is closed.

[0020] On the other hand, the opening / closing shutter support arm 53 includes a contact angle portion 531 that contacts and presses the closing portion 523 of the lower screw opening / closing shutter 52 when the lower opening 50 is closed, and the contact position of the contact angle portion 531 with respect to the closing portion 523 is configured to be located on the vertical line of the second lower opening end 5012.

[0021] In the above-described manner, by bringing the contact corner portion 531 into contact with the closing portion 523, the closing portion 523 can be firmly pressed against the second lower opening end portion 5012. As a result, as shown by the arrow in FIG. 7, when a load of grains is applied to the closing portion 523 of the lower screw opening / closing shutter 52, it is possible to suppress the closing portion 523 from plastically deforming convexly due to the weight of the grains as in the prior art, and it becomes possible to effectively prevent the grains (grain kernels) from leaking from both ends of the lower screw opening / closing shutter 52.

[0022] In addition, in the present embodiment, as shown in FIG. 7 and the like, the contact position of the contact corner portion 531 with respect to the closing portion 523 is set to be on the vertical line of the second lower opening end portion 5012. However, it is not necessarily limited to this. At least, by bringing the contact position of the contact corner portion 531 with respect to the closing portion 523 into contact with the closing portion 523 in a range outside the vertical line of the second lower opening end portion 5012, it is possible to suppress the closing portion 523 from plastically deforming convexly due to the weight of the grains as in the prior art.

[0023] Furthermore, in the present embodiment, as shown in FIG. 7 and the like, the lower screw opening / closing shutter 52 includes a standing portion 522 that stands upright from the left and right end portions of the closing portion 523 toward the lower opening inclined portion 502, and an inclined contact portion 521 that extends upward along the lower opening inclined portion 502 from the upper end portion of the standing portion 522.

[0024] With such a configuration, when the closing portion 523 plastically deforms concave due to the weight of the grains, as shown by the arrow in FIG. 7, the inclined contact portion 521 presses the lower opening inclined portion 502, and it becomes possible to more effectively prevent the grains from leaking from both ends of the lower screw opening / closing shutter 52.

[0025] (Alternative Embodiment) The present invention is not limited to the embodiments described above. For example, the following are also included.

[0026] For example, as shown in FIGS. 4 and 6, when the opening distance above the lower screw conveyor 51 is long, it is advisable to install the brace 6. Thereby, it is possible to effectively suppress the opening distance from spreading due to the weight of the grains.

[0027] Also, if one or more arm holders 54 are installed in the middle of the lower screw opening / closing shutter 52, it becomes possible to effectively suppress the deflection of the lower screw opening / closing shutter 52, and further effectively suppress the contact position of the contact corner 531 from shifting toward the lower opening 50 side (the right side direction in FIG. 7).

[0028] Also, the shutter locking portion 56 that rotatably locks the lower screw opening / closing shutter 52 is not particularly limited in its configuration. However, as shown in the enlarged view of part A in FIG. 5, by configuring the locking member 561 to be removable with bolts and nuts, it becomes possible to easily replace the lower screw opening / closing shutter 52.

[0029] Also, in the embodiment shown in FIG. 4, four opening / closing shutter support arms 53 are provided, but it is not necessarily limited to such a number, and it can be appropriately installed according to the length of the lower screw conveyor 51 and the load of grains applied to the lower screw opening / closing shutter 52.

[0030] As described above, the embodiments and alternative embodiments of the present invention have been explained. However, the above-described embodiments of the invention are for facilitating the understanding of the present invention and do not limit the present invention. The present invention can be changed and improved without departing from its gist, and equivalents of the present invention are included therein. Also, within the scope of solving at least a part of the above-described problems or achieving at least a part of the effects, combinations or omissions of the respective components described in the claims and the specification are possible.

[0031] 1 Grain dryer 2 Grain storage section 3 Grain drying section 4 Grain elevator 5 Grain conveying device 50 Lower opening 5011 First lower opening end 5012 Second lower opening end 502 Lower opening inclined part 51 Lower screw conveyor 52 Lower screw opening and closing shutter 521 Inclined contact part 522 Upright part 523 Blocking part 524 Locking piece 53 Opening and closing shutter support arm 531 Contact corner part 54 Arm holding part 55 Arm rotating part 56 Shutter locking part 561 Locking member 6 Brace

Claims

1. A shutter opening / closing mechanism for a lower screw conveyor in a grain dryer having at least a grain storage section and a grain drying section, wherein the shutter opening / closing mechanism includes a lower screw opening / closing shutter capable of opening or closing a lower opening located below the lower screw conveyor, and an opening / closing shutter support arm capable of pressing the lower screw opening / closing shutter to close the lower opening with the lower screw opening / closing shutter, the lower screw opening / closing shutter engages a shutter locking portion at one end thereof rotatably, and when closing the lower opening, includes a closing portion that abuts against a first lower opening end near the shutter locking portion and a second lower opening end facing the first lower opening end, the opening / closing shutter support arm includes a contact corner portion that abuts against and presses the closing portion when closing the lower opening, and a contact position of the contact corner portion with respect to the closing portion is located in a range outside the vertical line of the second lower opening end. A shutter opening / closing mechanism for a lower screw conveyor in a grain dryer, characterized by the above.

2. The lower screw opening / closing shutter includes a standing portion erected from left and right ends of the closing portion toward a lower opening inclined portion, and an inclined contact portion extending upward along the lower opening inclined portion from an upper end of the standing portion. A shutter opening / closing mechanism for a lower screw conveyor in a grain dryer according to claim 1, characterized by the above.

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