JP7467969B2 - Table Feeder - Google Patents

Description

The present invention relates to a receiving device, in particular a table feeder used as a receiving device in a communal grain drying facility.

Table feeders are used as receiving devices that feed grains brought in by trucks or other vehicles into equipment within a shared grain drying facility. In this table feeder, the grains are moved by a rotating body installed inside the hopper, and the grains can be discharged from a discharge outlet installed at the bottom of the hopper (for example, Figure 8 of Patent Document 1).

Japanese Patent Application Laid-Open No. 6-64756

However, in conventional table feeders, the rotational action of the rotor alone is not sufficient to move and discharge the grains, and for example, the grains may enter the interior of the rotor and remain there. If the grains remain inside the rotor, there is a problem in that when a different type of grain is fed into the table feeder, the remaining grains may become mixed in as foreign matter, resulting in contamination.

In view of the above problems, the present invention aims to provide a table feeder that can prevent grain from remaining inside the table feeder.

The invention according to claim 1 of the present application comprises at least a hopper tank in which grains are stored, and a rotating body provided in the hopper tank and having a rotor for discharging the grains stored in the hopper tank, the hopper tank having a rotating shaft cover member around the rotating shaft of the rotating body on the bottom surface, the rotor having a rotor lower cover part that slides against the rotating shaft cover member, the rotating shaft cover member and the rotor lower cover part forming an intrusion prevention part that prevents grains from intruding into the interior of the rotating body ,
The table feeder is characterized in that the rotor lower cover portion comprises a rotor lower plate having an opening, and a circular plate-shaped sealing member that is arranged along the opening of the rotor lower plate and slides against the rotating shaft cover member .

The invention according to claim 2 of the present application is a table feeder as described in claim 1, characterized in that the rotating shaft cover member has an inverted cone-shaped sliding side portion on its outer peripheral side surface, the upper outer shape of which is larger than the lower outer shape, and the sealing member is made of a plate-shaped elastic material, one end of which is attached to the rotor lower plate and the other end of which is bent and slides toward the lower part of the sliding side portion.

The invention of claim 3 of the present application is a table feeder as described in claim 2, characterized in that the sealing member has at least one lap joint portion in which one end overlaps with the other end located on the sliding side portion and slides against the sliding side portion, and the tip of the one end of the lap joint portion is located on the rotational direction side of the rotating body than the tip of the other end.

The invention according to claim 4 of the present application is the table feeder described in claim 1, characterized in that the rotating shaft cover member has a conical sliding side portion on its outer peripheral side surface with an upper outer shape smaller than a lower outer shape, and the sealing member is made of a plate -shaped elastic material, one end of which is attached to the rotor lower plate and the other end of which is bent toward the upper part of the sliding side portion and slides against the sliding side portion.

The invention of claim 5 of the present application is a table feeder as described in claim 4, characterized in that the sealing member has at least one lap joint portion in which one end overlaps with the other end located on the sliding side portion and slides against the sliding side portion, and the tip of the one end of the lap joint portion is located on the opposite side in the rotational direction of the rotating body than the tip of the other end.

The invention according to claim 6 of the present application is the table feeder described in claim 3 or claim 5 , characterized in that a butt joint portion where the ends are butted together is formed on the outer periphery of the overlap joint portion.

According to the invention of the present application, the feeder includes at least a hopper tank in which grains are stored, and a rotor that is provided in the hopper tank and discharges the grains stored in the hopper tank. The hopper tank has a rotating shaft cover member around the rotating shaft of the rotating body on the bottom surface, and the rotor has a rotor lower cover part that slides against the rotating shaft cover member. The rotating shaft cover member and the rotor lower cover part form an intrusion prevention part that prevents grains from entering the inside of the rotating body, so that it is possible to prevent grains from entering the inside of the rotating body and reduce the amount of grain remaining in the table feeder.

In addition, the rotor lower cover portion includes a rotor lower plate having an opening and a ring-shaped seal member that is provided along the opening of the rotor lower plate and slides against the rotary shaft cover member, making it difficult for grains to get between the seal member and the rotary shaft cover member. Furthermore, the seal member is prevented from bending upward when the rotor rotates, making it possible to effectively maintain the state in which the seal member and the rotary shaft cover member are in sliding contact with each other.

1 is an overall perspective view of a table feeder in an embodiment of the present invention. FIG. 2 is a plan view of a table feeder in the present embodiment. FIG. 2 is a side cross-sectional view of the table feeder in the present embodiment. 4 is a side cross-sectional view of an intrusion prevention portion and a residue removal portion of the table feeder in the embodiment. FIG. 1A is a perspective view of a rotary shaft cover member of a table feeder in this embodiment, and FIG. FIG. 2 is an exploded perspective view of a rotor and an intrusion prevention unit of the table feeder in the embodiment. 4 is an enlarged side cross-sectional view of an intrusion prevention portion and a residue removal portion of the table feeder in the embodiment. FIG. In this embodiment, (a) is an enlarged oblique view of the end of the seal of the table feeder before the end is combined, (b) is an enlarged oblique view of the end after it is combined, and (c) is an enlarged oblique view of the end after it is attached to the rotor lower plate. 8 is a cross-sectional view of the rotary shaft cover member and the seal of the table feeder in this embodiment, taken along the line YY in FIG. 7. 4 is a plan view illustrating a residue removal section of the table feeder in the embodiment. FIG. 10A is an enlarged plan view of a portion W of the table feeder in this embodiment, and FIG. 10B is a cross-sectional view taken along the line XX of FIG. 5 is a flowchart showing control of a rotating body and an air injection unit by a control unit of the table feeder during normal operation in the present embodiment. 5 is a flowchart of a process performed by a control unit of the table feeder when a stop signal is input in this embodiment. 5A is a perspective view of a rotating shaft cover member according to another embodiment of the present invention, FIG. 5B is a side view, and FIG. 5C is a cross-sectional view of the rotating shaft cover member and a rotor lower cover portion. 14(c) is a cross-sectional view of a rotary shaft cover member and a seal of a table feeder in another embodiment of the present invention, taken along the line ZZ of FIG. 14(c).

One embodiment of the present invention will be described below with reference to Figures 1 to 15.

The table feeder 1 according to this embodiment is applied as a receiving device in a shared grain drying facility. As shown in FIG. 1, the table feeder 1 is composed of at least a receiving hopper 2 into which grains are fed, a rotor 4 that is rotatably installed in the center of the receiving hopper 2 and moves the grains, a power unit 3 that supplies power to the rotor 4, and a stand 5 that supports the receiving hopper 2, the power unit 3, etc.

As shown in Figures 2 and 3, the receiving hopper 2 is provided with a hopper tank 21 that is generally funnel-shaped, and the hopper tank 21 is formed with a hopper bottom 211 that is generally circular. Furthermore, a discharge port 212 for discharging grains is provided on the outer periphery of the hopper bottom 211. A level detection unit 22 is provided on the side wall of the hopper tank 21 located above the discharge port 212, and is composed of an upper sensor 221 that detects the amount of grains stored, and a lower sensor 222 that is positioned below the upper sensor 221.

The power unit 3 is composed of at least a motor 31 and a power transmission device 32 that transmits the power from the motor 31 to the rotating body 4 .
The rotating body 4 is at least composed of a rotating shaft 41, an approximately pentagonal prism-shaped rotor 42 connected to the rotating shaft 41, a blade 43 attached to the approximately pentagonal prism-shaped outer peripheral surface of the rotor 42, a scraper 44 attached to the blade 43, a rotor upper plate 45 attached to the top of the rotor 42, and a conical cover 46 attached to the top of the rotor upper plate 45.

The blades 43 are rectangular plate-shaped bodies formed longer than the outer peripheral surface of the rotor 42, which is roughly pentagonal prism-shaped, and five blades in total are attached to the outer peripheral surface of the rotor 42, one on each side. The blades 43 are attached to the rotor 42 so as to protrude outward from the rotation axis of the rotor 4 and backward from the direction of rotation of the rotor 4, and rotate counterclockwise in a plan view. The shape of the rotor 42 is not limited to the roughly pentagonal prism shape described above, and may be any polygonal shape with an outer peripheral surface to which the blades 43 can be attached. The number of blades 43 to be installed may also be determined according to the shape of the outer peripheral surface of the rotor 42.

The scrapers 44 are formed into rectangular flat plates made of a flexible elastic material such as rubber, and are attached to each blade 43. As shown in FIG. 7, the scrapers 44 are attached to the blades 43 at a length such that the lower part of the scraper 44 is bent and in sliding contact with the hopper bottom surface portion 211.

The inside of the rotor in this invention refers to the inside of the outer circumferential surface of the polygonal rotor 42 in a plan view, and the outside of the rotor refers to the outside of the outer circumferential surface of the polygonal rotor 42 in a plan view. The outside of the rotor is the area where the grains that were originally fed in are present, and the inside of the rotor is the area where the grains that were originally fed in are not expected to be present.

As shown in Figures 2 and 3, the rotor upper plate 45 is a circular flat member and is formed to a size that circumscribes the outer shape of the pentagonal rotor 42.

Next, the intrusion prevention unit 6 and the residue removal unit 7 of the table feeder 1 in this embodiment will be described with reference to FIGS.
The intrusion prevention portion 6 prevents the grains from intruding into the inside of the rotating body 4 .
The residue removal section 7 removes remaining grains from within the hopper tank 21 of the table feeder 1 by injecting air.

As shown in Figures 4 and 5, the intrusion prevention unit 6 is composed of at least an annular rotating shaft cover member 61 attached to the hopper bottom surface portion 211, and a rotor lower cover portion 62 attached to the lower portion of the rotor 42, as shown in Figures 6 and 7.

The rotating shaft cover member 61 is formed so that the outer diameter of the upper part is larger than that of the lower part, and as shown in FIG. 5(b), an inverted cone-shaped sliding side part 611 is formed on the outer peripheral side part. The rotor lower cover part 62 is composed of at least a rotor lower plate 621, a seal 624 that is attached along the circular opening of the rotor lower plate 621 and slides against the sliding side part 611, and a seal plate 625 that sandwiches and fixes the seal 624 to the rotor lower plate 621.

The seal 624 in this embodiment is made of a plate-like elastic material such as rubber, and has two approximately semicircular ring shapes, as shown in Figure 6. Also, as shown in Figure 8(a), one end of the approximately semicircular ring-shaped seal 624 has a seal convex end 624a on the inner periphery and a seal concave end edge 624c on the outer periphery, and the other end has a seal flat end 624b and a seal flat end edge 624d.

Figure 8(b) shows the connection of the ends of the seal 624. As shown in the figure, the seal recessed end edge 624c and the seal flat end edge 624d are butted together to form a butt joint, and the seal protruding end 624a is placed under the seal flat end 624b, in other words, the seal flat end 624b is connected so as to overlap the seal protruding end 624a to form an overlap joint. Then, as shown in Figure 8(c), the outer periphery of the seal 624 is screwed to the rotor lower plate 621 by the seal plate 625. This configuration makes it possible to prevent grains from entering through the seal 624 joint.

In more detail, the inner circumferential side of the seal 624 is bent downward by contacting the sliding side portion 611, so that, as shown in the Y-Y cross-sectional view (see FIG. 7) of the overlapping joint portion of the seal 624 in FIG. 9, the seal flat end portion 624b (one end portion) located on the sliding side portion 611 side is overlapped by the seal convex end portion 624a (the other end portion), and the tip of the seal flat end portion 624b (one end portion) is located on the rotational direction side of the rotor 4 more than the tip of the seal convex end portion 624a (the other end portion), so that the seal convex end portion 624a is overlapped on the side where the invaded grain is present. Even if the seal 624 rotates in the rotational movement direction due to the rotation of the rotor 4, the seal convex end portion 624a is unlikely to be turned up, and the seal is configured to effectively prevent the intrusion of grains through the overlapping portion of the seal convex end portion 624a and the seal flat end portion 624b (seam portion B (see FIG. 8(c) and FIG. 9)). As a result, even if grains enter space A shown in FIG. 7, they can pass through seal 624 and effectively prevent the grains from entering the upper surface of rotor lower plate 621 or the inside of rotor 4.

When the seal convex end 624a is connected by sliding it under the seal flat end 624b, a space K is created as shown in FIG. 9. Even if grains enter through this space K, the seal concave end edge 624c and the seal flat end edge 624d are butted against each other on the outer periphery of the seal 624 and pressed down by the seal plate 625, preventing the grains from entering.

As shown in FIG. 7, the seal 624 attached to the rotor lower plate 621 in the above manner is configured so that the inner circumferential side of the seal 624 is bent downward to slide against the sliding side portion 611. This makes it possible to more effectively prevent grains from entering the interior of the rotor 4. Furthermore, in this embodiment, since the sliding side portion 611 is formed in an inverted cone shape, the seal 624 does not bend upward when the rotor 4 rotates, and can effectively maintain a state in which it slides against the sliding side portion 611.

Next, the residue remover 7 in this embodiment will be described.
4, the residue removal unit 7 is composed of at least a compressor 71, an air supply unit 72, and an air injection unit 73, and compressed air discharged from the compressor 71 is conveyed via the air supply unit 72 and injected from the air injection unit 73. In the air supply unit 72, compressed air is sent to a branch coupler 724 via an air hose 721, a rotary joint 722, and a rotary shaft through hole 723 provided in the inner cylindrical portion of the rotary shaft 41, in that order, and is distributed to an inner air hose 725 and an outer air hose 726. An inner air nozzle 731 and an outer air nozzle 732, which constitute the air injection unit 73, are connected to the inner air hose 725 and the outer air hose 726, respectively.

Next, a description will be given of the inner air nozzle 731. As shown in Figures 7 and 10, the inner air nozzle 731 is attached to the rotor lower plate 621, and is configured to spray air vertically toward the hopper bottom surface portion 211.
Specifically, in part N shown in Fig. 11(a) where adjacent blades 43 and scrapers 44 come into contact with each other, as shown in the X-X cross section of Fig. 11(b), a gap C is provided so that the lower part of the scraper 44 bends and slides against the hopper bottom surface part 211, and this gap C connects the outside of the rotor 42 to the lower part of the rotor lower plate 621. This gap C may cause grains to enter the inner periphery of the rotor 42 (space A in Figs. 7 and 11). Therefore, an inner air nozzle 731 is provided at a position as shown in the figure, so that grains can be discharged to the outside of the rotor 4.
In order to more effectively discharge the grains, the inner air nozzle 731 is provided on the rotation shaft side of the rotor lower plate 621 and on the rotation direction side of the gap C of the rotor 4, as shown in Figures 10 and 11. The location of the inner air nozzle 731 is not limited to this, and it may be provided, for example, just inside the gap C, that is, just inside the vertices of the pentagon of the rotor 42. The air sprayed from the inner air nozzle 731 toward the hopper bottom portion 211 radiates as shown in Figure 11(a), and part of it flows toward the gap C.

Next, the outer air nozzle 732 mentioned above will be described. As shown in FIG. 4 and FIG. 10, the outer air nozzle 732 is provided on the rotor upper plate 45 so as to be able to inject air in the outward direction of the rotation axis of the rotor 4 and toward the hopper bottom surface portion 211. This makes it possible to blow away grains remaining on the hopper bottom surface portion 211 by the air injected from the outer air nozzle 732, and grains discharged to the outer periphery of the rotor 4 by the air injected from the inner air nozzle 731, in the outward direction of the rotation axis of the rotor 4. Therefore, the grains remaining in the hopper tank 21 can be efficiently discharged from the discharge port 212 by the synergistic effect of the grain removal effect by the blade 43 and the grain movement effect by the air injection portion 73.

As shown in FIG. 10, the outer air nozzle 732 is provided on a side including the apex of the pentagonal prism of the rotor 42 on which the inner air nozzle 731 is provided, which corresponds to the side on the rear side in the direction of rotation of the rotor 42. By providing it in this manner, the grains that have entered the space A inside the rotor 4 can be efficiently moved by the jet of the outer air nozzle 732, which moves in immediately afterwards, after being discharged from the gap C by the jet of the inner air nozzle 731.

Next, the control configuration of the table feeder 1 of this embodiment will be explained based on the flow diagram in Figure 12.

The table feeder 1 of this embodiment is provided with a control unit (not shown), which is composed of at least a control device, an external interface, a main operation board, etc., and controls the operation of the table feeder 1. The upper sensor 221 and lower sensor 222, which are the level detection unit 22 described above, are connected to the control unit, and the amount of grain stored in the hopper tank 21 is determined based on the presence or absence of grain detection signals from each sensor.

The operation of the rotating body 4 of the table feeder 1 is as follows: grains are brought into the hopper tank 21 until they are above the sensor, and then discharge from the discharge outlet 212 begins. Then, once the grains are below the sensor, the rotating body 4 begins to operate.

In step S1, it is determined whether the amount of stored grains has reached the installation position of the upper sensor 221 and the lower sensor 222. If neither sensor detects grains (upper sensor OFF and lower sensor OFF), the process proceeds to step S2, where rotation of the rotating body 4 begins, and monitoring by the level detection unit 22 continues. Then, in step S3, if it is detected that the amount of stored grains has reached the installation position of the upper sensor 221, the process proceeds to step S5, where rotation of the rotating body 4 is stopped.

When neither the upper sensor 221 nor the lower sensor 222 detects any grains and the rotor 4 continues to rotate, the timer a counts the rotation time (step S6). Then, when it is determined in step S7 that the timer a has reached 20 seconds, the air injection unit 73 starts injecting air (air injection unit ON) in step S10, and timer b, which is set to 20 seconds, starts counting.

Next, in step S11, it is determined whether the count of timer b has reached 20 seconds. If it is determined that 20 seconds have passed, the process proceeds to step S14, where the rotation of the rotor 4 is stopped and the injection of air from the air injection unit 73 is stopped (air injection unit OFF).

If the upper sensor 221 or the lower sensor 222 detects a grain in step S8 while the timer a is counting (step S7), the timer a count is reset in step S9 and the process returns to step S3. If the upper sensor 221 or the lower sensor 222 detects a grain in step S12 while the timer b is counting (step S10), the timers a and b are both reset, and the injection of air from the air injection unit 73 is stopped.

As explained above based on the flow diagram in FIG. 12, when the amount of grains stored in the hopper tank 21 decreases to an amount where neither the upper sensor 221 nor the lower sensor 222 can detect the grains, the rotating body 4 is rotated and the grains remaining in the hopper tank 21 are discharged to the discharge port 212. Furthermore, when the rotating body 4 has been rotating for 20 seconds, the air injection unit 73 is configured to discharge the grains for 20 seconds in conjunction with the rotation. This unique control configuration makes it possible to efficiently discharge the grains remaining in the table feeder 1 from the discharge port 212.

Next, FIG. 13 shows a control flow based on a stop signal input to the control unit. When a stop signal is input from a stop button on the main operation board (not shown) or on the table feeder 1 (step S101), such as when work on the table feeder 1 is completed, the rotation of the rotating body 4 is started in step S102. Next, in step S103, air injection from the air injection unit 73 is started, and a 20-second count is started by timer b. Then, when it is determined in step S104 that timer b has reached 20 seconds, the rotation of the rotating body 4 and the injection of air from the air injection unit 73 are stopped in step S105. This makes it possible, for example, to reliably discharge grains remaining in the table feeder 1 by the operator's stop operation after work is completed.

Meanwhile, unlike the normal stop control described above, if an abnormal stop signal is input to the control unit from an emergency stop button (not shown) provided on the table feeder 1, an overload detection signal in the table feeder 1, an abnormal signal in a subsequent process, or the like, the rotation of the rotor 4 is immediately stopped in step S105 and control to stop the injection of air from the air injection unit 73 is executed. As described above, by differentiating the stop control mode during normal times from the stop control mode during an emergency, the system is configured to reliably discharge grains remaining in the table feeder 1 at least during normal times, while control that prioritizes safety is executed during abnormal times.

[Other Modifications]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and also includes, for example, the following.

For example, in this embodiment, the rotating shaft cover member 61 having an inverted cone-shaped sliding side portion 611 as shown in FIG. 5(b) etc. is installed on the hopper bottom surface portion 211, but this is not limited thereto. It is also possible to use a rotating shaft cover member 61a having a cone-shaped sliding side portion 611a as shown in FIG. 14(b) etc. and bend the seal 624 upward to slide it. With this configuration, it is possible to easily inspect and check the folding state, wear state, deterioration state, etc. of the seal 624 from above by simply removing the cone cover 46.

In this case, the seam of the seal 624 will have the same configuration as shown in FIG. 8, but the sliding correspondence with the sliding side portion 611a will be different.

In more detail, the inner circumferential side of the seal 624 is bent upward by contacting the sliding side portion 611a, so that, as shown in FIG. 15, the Z-Z cross section (see FIG. 14) of the overlapping joint of the seal 624 overlaps the seal flat end 624b (the other end) with the seal convex end 624a (one end) located on the sliding side portion 611a side, and the tip of the seal convex end 624a (one end) is located on the opposite side of the rotation direction of the rotor 4 from the tip of the seal flat end 624b (the other end), so that the grains are effectively prevented from entering through the overlapping portion (seam portion B (see FIG. 8(c) and FIG. 15) of the seal convex end 624a and the seal flat end 624b. As a result, for example, even if grains enter the space A shown in FIG. 7, it is possible to effectively prevent the grains from passing through the seal 624 and entering the upper surface of the rotor lower plate 621 or the inside of the rotor 4.

When the seal convex end 624a is connected by sliding it under the seal flat end 624b, a space K is created as shown in FIG. 15. Even if grains enter through this space K, the seal concave end edge 624c and the seal flat end edge 624d are butted against each other on the outer periphery of the seal 624 and pressed down by the seal plate 625, preventing the grains from entering.

In addition, in this embodiment, the rotating shaft cover member 61 is annular, but this is not limited to this and may be dish-shaped. In this case, an opening through which the rotating shaft 41 passes is provided in the center.

In addition, in this embodiment, the air injection unit 73 is provided with one inner air nozzle 731 and one outer air nozzle 732, but this is not limited to this. For example, both the inner air nozzle 731 and the outer air nozzle 732, or either one, may be provided in multiples.

In addition, in this embodiment, the compressed air is supplied to the inner air nozzle 731 and the outer air nozzle 732, which are the air injection unit 73, by the same compressor 71 and air supply unit 72, but this is not limited to this. For example, a compressor and an air supply unit may be provided separately for each of the inner air nozzle 731 and the outer air nozzle 732. As a further alternative, it is possible to individually adjust the amount and pressure of the air injected from each air nozzle by adding a variable nozzle or a flow rate adjustment mechanism. This makes it possible to optimize the discharge efficiency of the remaining grains depending on the type and size of the grains fed into the receiving hopper.

In addition, in this embodiment, air is ejected from the inner air nozzle 731 and the outer air nozzle 732 at the same time, but this is not limited to this. For example, air may be ejected from the inner air nozzle 731 first, and then immediately thereafter, air may be ejected from the outer air nozzle 732 in an alternating manner. That is, as shown in FIG. 10, the outer air nozzle is provided on the side including the apex of the pentagonal prism of the rotor 42 on which the inner air nozzle is provided, and the outer air nozzle is provided on the side corresponding to the rear side in the direction of rotation of the rotor. By controlling the ejection to be alternately performed, the grains that have entered the space A inside the rotor 4 are ejected from the gap C by the ejection from the inner air nozzle 731, and then can be efficiently moved by the ejection from the outer air nozzle 732 that moves immediately thereafter.

Furthermore, the air injection from at least the inner air nozzle 731 may be controlled continuously from the time when the rotating body 4 starts to rotate or when the table feeder 1 starts to operate. This makes it possible to prevent grains from entering the rotating body 4 through the gap C from the very beginning.

In addition, in this embodiment, the inner air nozzle 731 is attached to the rotor lower plate 621 so as to spray air vertically toward the hopper bottom surface portion 211, but this configuration is not necessarily limited thereto, and it may be configured, for example, to spray air in the outward direction of the rotation axis of the rotor 4. This makes it possible to discharge remaining grains more efficiently.

In addition, in this embodiment, the outer air nozzle 732 is arranged to spray air from the rotor upper plate 45 toward the hopper bottom surface 211 in the outward direction of the rotation axis of the rotor 4, but this is not limited to the configuration, and in addition to this configuration, it may also be arranged to spray air forward in the direction of rotation of the rotor 4. By arranging the nozzle in this manner, the remaining grains on the hopper bottom surface 211 can be sprayed in a sweeping manner, allowing for efficient discharge.

In addition, in this embodiment, the outer air nozzle 732 and the inner air nozzle 731 are fixedly arranged, but it is also possible to add a movable device to each air nozzle and configure it so that the air injection direction can be changed as appropriate. By configuring it in this way, it becomes possible to inject air evenly onto the hopper bottom surface portion 211, and it becomes possible to more efficiently discharge remaining grains.

In addition, in this embodiment, an upper sensor 221 and a lower sensor 222 are provided to detect the amount of grain stored in the hopper tank 21, but this is not necessarily limited to such a configuration, and the amount of grain stored may be detected with a single sensor.

In addition, in this embodiment, air is sprayed from the outer air nozzle over the entire circumference of the rotating body 4 while it is rotating, but this is not limited to this. It is also possible to control the air to be sprayed when the outer air nozzle 732 comes in front of the discharge port 212 by grasping the rotational position of the rotating body 4, that is, when the outer air nozzle 732 is positioned in the range from 0 degrees to 90 degrees due to the rotation of the rotating body 4 if the position of the discharge port 212 is 90 degrees from the rotating shaft 41 as shown in FIG. 2. In this way, the grains can be effectively moved to the discharge port 212 by the spray of air.

In addition, in this embodiment, the grain table feeder 1 has been described as an embodiment, but it can also be applied to table feeders for other powders and granular materials.

Although the above describes the embodiments of the present invention and some of the variations, these descriptions are provided to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from its spirit, and includes equivalents. Furthermore, the components described in the claims and specification may be combined or omitted to the extent that at least some of the problems described above can be solved or at least some of the effects can be achieved.

1 Table feeder 2 Loading hopper 21 Hopper tank 211 Hopper bottom surface portion 212 Discharge port 22 Level detection portion 221 Upper sensor 222 Lower sensor 3 Power portion 31 Motor 32 Power transmission device 4 Rotor 41 Rotating shaft 42 Rotor 43 Blade 44 Scraper 45 Rotor upper plate 46 Cone cover 5 Frame 6 Intrusion prevention portion 61 Rotating shaft cover member 611 Sliding side portion 62 Rotor lower cover portion 621 Rotor lower plate 624 Seal 624a Seal convex end portion 624b Seal flat end portion 625 Seal plate 7 Residual removal portion 71 Compressor 72 Air supply portion 721 Air hose 722 Rotary joint 723 Rotating shaft through hole 724 Branch coupler 725 Inner air hose 726 Outer air hose 73 Air injection portion 731 Inner air nozzle 732 Outer air nozzle A Space B Seam portion C gap

Claims (6)

The grain fertilizer includes at least a hopper tank in which grains are stored, and a rotor provided in the hopper tank and having a rotor that discharges the grains stored in the hopper tank.
the hopper tank has a rotation shaft cover member around the rotation shaft of the rotor on the bottom surface,
The rotor has a rotor lower cover portion that slides relative to the rotary shaft cover member,
The rotary shaft cover member and the rotor lower cover part constitute an intrusion prevention part that prevents grains from intruding into the inside of the rotor,
A table feeder characterized in that the rotor lower cover portion comprises a rotor lower plate having an opening, and a circular plate-shaped sealing member that is arranged along the opening of the rotor lower plate and slides against the rotating shaft cover member . The rotating shaft cover member has an inverted cone-shaped sliding side surface portion on an outer circumferential side surface, the upper portion of which has a larger outer shape than the lower portion of the sliding side surface portion,
2. The table feeder according to claim 1, wherein said seal member is made of a plate-like elastic material, one end of which is attached to said rotor lower plate and the other end of which is bent and slidable toward the lower portion of said sliding side portion. the seal member has at least one overlapping seam portion where one end portion is overlapped with the other end portion located on the sliding side surface portion and slides against the sliding side surface portion,
3. The table feeder according to claim 2, wherein the overlap joint portion has a tip end at one end located on the rotational direction side of the rotor relative to a tip end at the other end. The rotating shaft cover member has a cone-shaped sliding side surface portion on an outer circumferential side surface, the upper portion of which has a smaller outer shape than the lower portion of the sliding side surface portion,
2. The table feeder according to claim 1, wherein the sealing member is made of a plate-shaped elastic material, one end of which is attached to the rotor lower plate and the other end of which is bent toward the upper portion of the sliding side portion so as to slide against the sliding side portion. the seal member has at least one overlapping seam portion where one end portion is overlapped with the other end portion located on the sliding side surface portion and slides against the sliding side surface portion,
5. The table feeder according to claim 4, wherein the overlap joint portion is arranged such that a tip end of the one end is located on an opposite side in the rotation direction of the rotor than a tip end of the other end. 6. The table feeder according to claim 3, wherein a butt joint portion where ends are butted together is formed on an outer periphery of the overlap joint portion.

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