CN110192088A - Metering device, door and method of operation of the metering device - Google Patents

Abstract

In the metering device, the waiting time from closing the supply door to metering is reduced, and the throughput of the metering device is improved. The metering device is provided with: a storage tank for storing objects to be weighed, and an opening formed in the lower part of the storage tank; a supply door for opening and closing the opening; The measuring tank is used to store the measuring object supplied from the storage tank through the opening, and the measuring tank is supported by the load cell. The movement locus of the lower surface of the supply door during the opening and closing operation of the supply door is set so that at least the area directly below the opening is located inside the metering tank.

Description

Metering device, door and method of operation of the metering device

technical field

The present invention relates to metering technology.

Background technique

Conventionally, there are known weighing devices that supply a weighing object (for example, grains) stored in a storage tank to a measuring tank disposed below it, and measure with a load cell (for example, the following patent documents 1 to 3). In such a metering device, the object to be weighed in the storage tank falls due to gravity when the supply door arranged at the lower part of the storage tank is opened, and is thereby supplied to the metering tank.

Patent Document 1: Japanese Patent Application Publication No. 7-113568

Patent Document 2: Japanese Patent Laid-Open No. 2004-271350

Patent Document 3: Japanese Patent No. 3913156

In such a weighing device, vibration occurs due to the impact when the object to be weighed falls into the measuring tank. This vibration causes a decrease in measurement accuracy, so the measurement of the load cell is usually carried out after the vibration stops. However, if this standby time becomes longer, the time required for one cycle of metering becomes longer, and as a result, the throughput (for example, the throughput per unit time) of the metering device decreases. Accordingly, it is desired to reduce the standby time and improve the throughput of the metering device.

Contents of the invention

The present invention has been made to solve at least a part of the above-mentioned problems, and the invention can be implemented as the following aspects, for example.

According to a first aspect of the present invention, there is provided a metering device. The metering device has: a storage tank for storing objects to be weighed, and an opening is formed in the lower part of the storage tank; a supply door for opening and closing the opening; and a metering tank, which is arranged at a lower position than the storage tank. , which is used to store the measuring object supplied from the storage tank through the opening, and the measuring tank is supported by the load cell. The movement locus of the lower surface of the supply door during the opening and closing operation of the supply door is set so that at least the area directly below the opening is located inside the metering tank.

According to this metering device, in the state where the supply door is opened and the object to be weighed in the storage tank is closed with the object to be weighed stored in the metering tank, the supply door is closed, and then the load cell is weighed, thereby It is possible to suppress the object to be weighed from being carried out by the supply door to be scattered to the outside of the metering tank during the closing operation of the supply door, and to reduce the standby time from the closing operation of the supply door to the measurement by the load cell. Specifically, the supply door is closed in a state where the object to be measured in the storage tank is continuous with the object to be measured stored in the measurement tank. Therefore, before the closing operation of the supply door, the weight of the object to be measured in the storage tank is used to press the metering tank. As a result, the vibration of the measuring tank generated when the object to be weighed is supplied from the storage tank to the measuring tank can be terminated early. Therefore, it is possible to reduce the waiting time from the closing of the supply door to the measurement, thereby improving the throughput of the measurement device.

According to the second aspect of the present invention, in the first aspect, the opening is disposed inside the metering tank. According to this aspect, during the closing operation of the supply gate, it is possible to further suppress that the object to be weighed is carried out by the supply gate and scattered to the outside of the measuring tank.

According to a third aspect of the present invention, on the basis of the first aspect or the second aspect, the metering device includes a gap forming unit for closing the gap after the object to be weighed is supplied from the storage tank to the metering tank. When supplying the gate, a gap is formed between the supply gate and the weighing object stored in the measuring tank. According to this aspect, since the supply gate does not come into contact with the object to be weighed in the metering tank during metering by the load cell, metering accuracy can be improved.

According to a fourth aspect of the present invention, in addition to the third aspect, the gap forming means is a protrusion provided on the lower surface of the supply door at the front end side in the traveling direction during the closing operation of the supply door so as to protrude downward from the lower surface. According to this aspect, when the supply door is closed, the object to be weighed is carried out by the protruding portion, so that a gap corresponding to the height of the protruding portion can be formed between the supply door and the object to be weighed stored in the measuring tank. Therefore, the above-mentioned gap can be easily formed.

According to a fifth aspect of the present invention, in addition to the first aspect or the second aspect, the supply door is configured to pivot about a fulcrum. A longitudinal section along the pivoting direction of the lower surface of the supply door has an arc shape. The arc shape is set so that the radius on the front side in the advancing direction during the closing operation of the supply door is larger than the radius on the rear side. According to this aspect, when the supply door is closed, the object to be weighed is taken out from the portion on the front side in the advancing direction of the supply door, and thus a gap corresponding to the difference in radius is formed. Therefore, the above-mentioned gap can be easily formed. Furthermore, since the gap can be formed only by studying the shape of the supply gate, a special device or structure for forming the gap is not required, and the number of parts can be reduced.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the movement trajectory is set such that the front end of the movement trajectory in the direction of travel during the closing operation of the supply door is located lower than that of the storage tank. The position on the inner side of the outer edge. According to this aspect, it is possible to further suppress that the object to be weighed is carried out by the supply door and scattered to the outside of the measurement tank during the closing operation of the supply door. In addition, when the sixth aspect is applied to the third to fifth aspects, it is possible to prevent the objects to be weighed carried out by the supply gate from being piled up near the outer edge of the storage tank to form a mountain, and a part of the mountain collapses and enters the above-mentioned fill the gap.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the measurement device includes: a sensor capable of detecting whether or not a predetermined amount or more of the object to be measured is stored in the storage tank; Control the action of the metering device. The control unit controls the weighing device so that the object to be weighed is supplied from the storage tank to the measuring tank by opening the supply door when a predetermined amount or more of the object to be weighed is stored in the storage tank. According to this aspect, after it is confirmed by the sensor that the object of measurement in the storage tank and the object of measurement stored in the measurement tank are in a continuous state, a sufficient amount of the object of measurement required to be stored in the storage tank can be carried out. close action. Therefore, the control intended in the first aspect can be reliably implemented.

According to the eighth aspect of the present invention, in addition to the seventh aspect, when the storage tank does not store the object to be measured in a predetermined amount or more, the control unit waits until the object to be measured in a predetermined amount or more is stored. , the first operation mode controls the metering device for opening the supply door and supplying the object to be weighed from the storage tank to the metering tank. According to this aspect, the control intended in the first aspect can be reliably performed.

According to the ninth aspect of the present invention, in addition to the seventh aspect, when the storage tank does not store the object to be measured in a predetermined amount or more, the control unit does not wait until the object to be measured in a predetermined amount or more is stored, On the other hand, the second operation mode of opening the supply door and supplying the object to be weighed from the storage tank to the metering tank controls the metering device. In the case of controlling the metering device in the first operation mode, the time from closing the supply door to the start of metering is set to be longer than the time from closing the supply door to starting of metering in the case of controlling the metering device in the second operation mode. short time. According to this aspect, when the supply amount of the object to be measured to the storage tank is small, as the second operation mode, the object to be measured stored in the storage tank and the object to be measured in the measurement tank can be brought into a continuous state. , to close the supply door. Therefore, there is no need to stand by for an excessively long time until a predetermined amount or more of the object to be weighed is stored. As a result, the throughput of the measuring device can be improved. In addition, when the metering device is controlled in the second operation mode, the time from closing the supply door to the start of metering is longer than the time from closing the supply door to starting metering in the case of controlling the metering device in the first operation mode, Therefore, it is possible to sufficiently secure the time for the vibration to end.

According to a tenth aspect of the present invention, there is provided a metering device. The metering device includes: a storage tank for storing objects to be weighed, and an opening formed in the lower part of the storage tank; a supply door for opening and closing the opening; and a metering tank provided at a lower position than the storage tank. , which is used to store the measuring object supplied from the storage tank through the opening, and the measuring tank is supported by the load cell. The measuring device is configured to perform measurement by the load cell after closing the supply door while the supply door is open and the object to be weighed in the storage tank is continuous with the object to be weighed stored in the measuring tank. According to this metering device, similarly to the first embodiment, it is possible to reduce the waiting time from closing the supply door to performing metering, thereby improving the throughput of the metering device. Any of the second to ninth aspects can also be applied to the tenth aspect.

According to an eleventh aspect of the present invention, there is provided a door used for a metering device. The door includes a door body and a protrusion protruding from one surface of the door body. According to this gate, the effect similar to the 4th aspect is exhibited.

According to a twelfth aspect of the present invention, there is provided a door used for a metering device. The door has a surface having an arcuate longitudinal section. The arc shape is set such that the radius along one side of the arc shape is larger than the radius on the other side. According to this gate, the same effect as the fifth aspect is exerted.

According to a thirteenth aspect of the present invention, there is provided a method of operating a metering device. This method includes the following steps: a step of preparing a metering device, the metering device includes: a storage tank with an opening formed in the lower part, a supply door for opening and closing the opening, and a dynamometer provided at a lower position than the storage tank and supported by a load cell. The metering tank of the sensor; the first process, open the supply door, and supply the metering object stored in the storage tank to the metering tank through the opening; the second process, after the first process, the metering object in the storage tank and the object stored in the storage tank Closing the supply door while the objects to be weighed in the metering tank are continuous; and the third process, after the second process, measuring the objects to be weighed in the metering tank by the load cell. According to this aspect, similarly to the first embodiment, the waiting time from closing the supply door to performing weighing can be reduced, thereby improving the throughput of the weighing device. Any of the second to ninth aspects can also be applied to the thirteenth aspect.

Description of drawings

Fig. 1 is a cross-sectional view showing a schematic configuration of a measuring device according to a first embodiment of the present invention.

Fig. 2 is a schematic diagram showing the operation of the measuring device.

Fig. 3 is a schematic diagram showing the operation of the measuring device.

Fig. 4 is a schematic diagram showing the operation of the measuring device.

Fig. 5 is a schematic diagram showing the operation of the measuring device.

Fig. 6 is a flowchart showing the flow of the first operation mode of the weighing device.

Fig. 7 is a flowchart showing the flow of the second operation mode of the weighing device.

Fig. 8 is a side view showing the shape of a supply door of a weighing device according to a second embodiment.

Fig. 9 is a cross-sectional view showing a schematic configuration of a measuring device according to a third embodiment.

Detailed ways

FIG. 1 is a cross-sectional view showing a schematic configuration of a measuring device 20 according to a first embodiment of the present invention. In this embodiment, the weighing device 20 is a device for measuring the weight of cereals. However, the metering device 20 can be used for metering any desired granular or powdery substances. As shown in the figure, the measuring device 20 includes a storage tank 30 , a supply door 40 , a measuring tank 50 , a load cell 52 , a sensor 70 , and a control unit 80 .

The upper part of the storage tank 30 is connected to a supply line (not shown). The objects to be weighed 90 are continuously or intermittently supplied from the supply line to the storage tank 30 and temporarily stored in the storage tank 30 . The capacity of the storage tank 30 is set to be sufficiently larger (for example, 1.5 times or more) than the capacity of the measuring tank 50 described later. An opening 31 is formed in a lower portion of the storage tank 30 . The storage tank 30 is formed in the vicinity of the opening 31 so that the cross section becomes gradually smaller toward the opening 31 . A supply door 40 for opening and closing the opening 31 is provided near the opening 31 . In the present embodiment, the supply door 40 is configured to pivot about a fulcrum. The supply door 40 is operated by an arbitrary actuator (for example, an air cylinder). In addition, the supply door 40 has a lower surface in the shape of an arc when viewed in longitudinal section along the pivoting direction thereof. A protrusion 41 is provided on the lower surface of the supply door 40 so as to protrude downward from the lower surface. The protruding portion 41 is provided on the lower surface of the supply door 40 at the front end side in the traveling direction (in this embodiment, the front end portion in the traveling direction) during the closing operation of the supply door 40 . The function of the protruding portion 41 will be described later in detail. In the present embodiment, the supply door 40 has a constant radius when viewed in longitudinal section along the pivoting direction thereof, except for the position where the protruding portion 41 is provided.

The upper side of the metering tank 50 is open, and the metering tank 50 is provided below the storage tank 30 . The storage tank 30 is arranged substantially in the center of the metering tank 50 when viewed in the vertical direction. The measuring tank 50 temporarily stores the measuring object 90 intermittently supplied from the storage tank 30 through the opening 31 . The opening 31 is disposed inside the metering tank 50 . The metering tank 50 is supported by a load cell 52 . The load cell 52 is attached to a sufficiently rigid main body frame 55 . In the present embodiment, the gauge tank 50 is supported at one point by the load cell 52 . However, the metering tank 50 may be supported at two or more points.

A discharge port 51 is formed at the lower portion of the metering tank 50 . In addition, a discharge door 60 for opening and closing the discharge port 51 is provided near the discharge port 51 . The object to be weighed 90 stored in the weighing tank 50 is weighed by the load cell 52 and discharged to subsequent equipment (for example, a storage tank, a conveyor, etc.).

The sensor 70 is arranged on the upper part of the storage tank 30 . The sensor 70 is a level sensor for detecting whether or not a predetermined amount or more of the object to be weighed 90 is stored in the storage tank 30 . The control unit 80 includes a CPU and a memory, and controls the overall operation of the measuring device 20 by executing a program stored in the memory.

In this metering device 20 , the movement locus of the lower surface of the supply door 40 during the opening and closing operation of the supply door 40 is set so that at least the area directly below the opening 31 is located inside the metering tank 50 . In FIG. 1 , the movement trajectory 35 formed on the lower surface of the protruding portion 41 of the supply door 40 is shown as the trajectory of the lower surface of the supply door 40 .

Next, the measurement operation of the measurement device 20 will be described. 2 to 5 are schematic diagrams showing the operation of the measuring device 20 . In FIGS. 2 to 5 , the discharge door 60 is omitted from illustration. When performing weighing using the weighing device 20 , first, as shown in FIG. 2 , the weighing object 90 is stored in the storage tank 30 in a state where the supply door 40 is located at the closed position. Next, as shown in FIG. 3 , the control unit 80 pivots the supply door 40 in the direction of the arrow A1 to open the supply door 40 . Thereby, the weighing target object 90 in the storage tank 30 falls in the measuring tank 50 by gravity as shown by arrow A2. At this time, since the measurement object 90 collides with the bottom surface of the measurement tank 50, the measurement tank 50 vibrates as shown by arrow A3. The measuring device 20 has a function of stopping this vibration early.

FIG. 4 shows the state after the supply of the measuring object 90 from the storage tank 30 to the measuring tank 50 is completed. The object to be weighed 90 is stored from the bottom surface of the measuring tank 50 to the lower end of the storage tank 30 , whereby the flow of the object to be weighed 90 from the storage tank 30 to the measuring tank 50 is stopped. The supply door 40 remains in the open position. As mentioned above, the capacity of the storage tank 30 is larger than the capacity of the measuring tank 50, so even when the measurement object 90 is intermittently supplied to the storage tank 30, many measurement objects 90 remain in the storage tank 30. . When the object to be weighed 90 is continuously supplied to the storage tank 30 , more objects to be weighed 90 remain. In this state, the weighing object 90 in the storage tank 30 is in a continuous state with the weighing object 90 stored in the measuring tank 50 in the area directly below the opening 31 of the storage tank 30 . Hereinafter, this state is also referred to as a continuous state. On the other hand, as described above, since the storage tank 30 is arranged substantially in the center of the measuring tank 50 when viewed in the vertical direction, a space not filled with the measuring object 90 is formed on the outer edge of the measuring tank 50 . In particular, in this embodiment, as described above, the storage tank 30 is formed such that the cross section becomes gradually smaller toward the opening 31 , so that the object 90 to be weighed is less likely to be stored in the outer edge of the measurement tank 50 . Therefore, a space not filled with the object to be weighed 90 is formed relatively large.

In the state shown in FIG. 4 , the weighing tank 50 is pressed downward by the weight of the weighing object 90 remaining in the storage tank 30 . As a result, the vibration indicated by the arrow A3 in FIG. 3 ends prematurely.

After waiting until the vibration is finished, the control unit 80 pivots the supply door 40 in the direction of the arrow A5 to close the supply door 40 as shown in FIG. 5 . At this time, the surface of the object to be weighed 90 is taken out by the protruding portion 41 toward the front in the traveling direction of the supply door 40 . As a result, a gap 53 is formed between the supply gate 40 and the weighing object 90 stored in the measuring tank 50 . Therefore, when the load cell 52 performs measurement, the supply gate 40 does not come into contact with the measurement target object 90 in the measurement tank 50 , so measurement accuracy can be improved.

In addition, the movement trajectory 35 is set such that the front end of the movement trajectory 35 in the traveling direction during the closing operation of the supply door 40 is located inside the outer edge portion 54 of the metering tank 50 . Therefore, during the closing operation of the supply gate 40 , it is possible to further suppress the measurement target object 90 from being carried out by the supply gate 40 and scattered to the outside of the measurement tank 50 . In addition, it is possible to prevent the object 90 carried out by the supply gate 40 from being piled up near the outer edge portion 54 of the measuring tank 50 to form a mountain, and a part of the mountain collapses and enters the gap 53 to fill the gap 53 .

In this way, when the closing operation of the supply door 40 is completed, the vibration is terminated early as described in FIG. Therefore, the time for one cycle of measurement is shortened by the time equivalent to the shortened standby time, and the throughput of the measurement device 20 can be improved.

In the measuring device 20 described above, the control unit 80 may control the measuring device 20 by selecting any one of the first operation mode and the second operation mode as described below.

FIG. 6 is a flowchart showing the flow of the first operation mode. The first operation mode starts with the supply door 40 closed. When the first operation mode starts, as shown in the figure, the control unit 80 first determines whether or not a predetermined amount or more of the weighing object 90 is stored in the storage tank 30 (step S110 ). This determination is made using the detection result of the sensor 70 . The predetermined amount is set in advance so that the continuous state explained in FIG. 4 can be realized when the supply door 40 is opened.

As a result of the determination, if the object to be weighed 90 is not stored in the predetermined amount or more, the control unit 80 waits until the object to be weighed 90 is stored in the predetermined amount or more (step S110: NO). On the other hand, when the object 90 is stored in a predetermined amount or more (step S110: Yes), as shown in FIG. 50 is supplied (step S120). Next, the control unit 80 closes the supply gate 40 as shown in FIG. 5 after the supply of the object to be weighed 90 is completed, that is, after the continuous state shown in FIG. 4 (step S130 ). The determination of the completion of the supply of the object to be weighed 90 may be performed, for example, based on whether or not a predetermined standby time has elapsed. The predetermined standby time is set in advance through experiments or experience according to the characteristics of the measurement object 90 . Alternatively, a level sensor for determining whether the object to be weighed 90 in the gauge tank 50 has reached the lower end of the storage tank 30 may be provided in the gauge tank 50 .

Next, when the supply door 40 is closed, the control unit 80 waits for the time T1 (step S140). This time T1 is set to be shorter than conventional ones in consideration of the above-described effect of performing the closing operation of the supply door 40 in a continuous state. This time T1 may be zero depending on the characteristics of the weighing object 90 and the specifications of the weighing device 20 . That is, it is also possible to omit the standby.

When the waiting time is T1, the control unit 80 performs measurement by the load cell 52 (step S150). When the measurement is completed, the control unit 80 opens the discharge door 60 to discharge the measurement object 90 in the measurement tank 50 (step S160). Then, when the discharge is completed, the control unit 80 closes the discharge door 60 (step S170). In this way, one cycle of the metering operation in the first operation mode ends. This cycle is repeated. According to this first operation mode, the operation of closing the supply door 40 in a continuous state can be reliably performed.

FIG. 7 is a flowchart showing the flow of the second operation mode. In FIG. 7 , the same reference numerals as in FIG. 6 are assigned to the same steps as those in the first operation mode. Hereinafter, points different from the first operation mode will be mainly described, and points not particularly described are the same as the first operation mode. In the first operation mode, when the second operation mode is started, as shown in the figure, the control unit 80 first determines whether or not a predetermined amount or more of the weighing object 90 is stored in the storage tank 30 (step S110 ).

As a result of the determination, when the object to be weighed 90 is stored in a predetermined amount or more (step S110: Yes), the control unit 80 executes steps S120 to S170 to end one cycle of the measurement. On the other hand, when the measuring object 90 is not stored in a predetermined amount or more (step S110: No), the control unit 80 opens the supply door 40, and supplies the measuring object 90 in the storage tank 30 to the measuring tank 50 (step S220). ). Then, when the supply of the object to be weighed 90 is completed, the control unit 80 closes the supply door 40 (step S230 ). In this case, the amount of the object to be measured 90 stored in the storage tank 30 is small, and therefore the object to be measured 90 stored in the storage tank 30 is in a discontinuous state with the object to be measured 90 stored in the measuring tank 50 ( Hereinafter, it is also referred to as a discontinuous state), and the supply gate 40 is closed. In addition, the time until the end of the supply of the weighing object 90 is set to be shorter than step S130.

Next, when the supply door 40 is closed, the control unit 80 waits for the time T2 (step S240). The time T2 is set to be longer than the time T1. That is, since the quantity of the weighing object 90 stored in the storage tank 30 is small here, the supply door 40 is closed in a discontinuous state. Therefore, the standby time (time T2 ) until the vibration ends is set to be longer than the time T1 . When the waiting time is T2, the control unit 80 executes steps S150 to S170 to end one cycle of measurement. According to the second operation mode, when the amount of the object to be weighed 90 stored in the storage tank 30 is large, the supply door 40 is continuously closed, whereby the standby time can be shortened. In addition, when the storage amount of the measurement target object 90 in the storage tank 30 is small, the measurement target object 90 stored in the storage tank 30 without waiting for an excessively long time until a predetermined amount or more is stored. Therefore, the throughput of the measuring device 20 can be improved. The above configuration is particularly advantageous when the gauge tank 50 is supported at one point by the load cell 52 as in the present embodiment, that is, when the vibration is difficult to stop. In other words, according to the above-mentioned structure, both the simple support structure of the measuring tank 50 and the improvement of the throughput of the measuring device 20 can be compatible.

The above-described first operation mode and second operation mode may be selected by the control unit 80 based on a user instruction input through a user interface included in the measuring device 20 . Alternatively, the first operation mode and the second operation mode may be automatically selected by the control unit 80 according to the supply amount of the object to be weighed 90 supplied to the storage tank 30 . For example, the control unit 80 may use the sensor 70 to monitor the storage status of the object 90 to be measured in the storage tank 30, and may select the second option when the time to ensure the storage of the above-mentioned predetermined amount or more is more than a predetermined percentage within a predetermined period. One action mode, and select the second action mode in other cases.

Fig. 8 is a side view showing the shape of a supply door 340 of a weighing device according to a second embodiment of the present invention. The supply door 340 is configured to pivot about the fulcrum 343 as in the first embodiment. The supply door 340 has an arc-shaped lower surface when viewed in longitudinal section along the pivoting direction thereof. In the present embodiment, the radius R of the arc shape of the longitudinal section is not constant along the circumferential direction. Specifically, the radius R1 of the front end portion 341 in the advancing direction during the closing operation of the supply door 340 is larger than the radius R2 of the rear end portion 342 in the advancing direction during the closing operation. In addition, from the end portion 341 to the end portion 342 , the radius R gradually decreases from the radius R1 to the radius R2 along the circumferential direction. Therefore, when viewed from the fulcrum 343 , the movement locus 335 of the end portion 341 is positioned radially outward from the movement locus 336 of the end portion 342 .

Therefore, a gap 353 is formed between the supply gate 340 and the weighing object 90 by the closing operation of the supply gate 340 . According to this configuration, the gap 353 can be formed only by considering the shape of the supply gate 340 . Therefore, there is no need for a special device or structure for forming the gap, and the number of parts can be reduced. This effect is not limited to the shape illustrated in FIG. 8 , and can be obtained when the radius on the front side in the advancing direction is set to be larger than the radius on the rear side during the closing operation of supply door 340 . More specifically, when the supply door 340 is at the closed position, if the radius of the supply door 340 in the region directly below the opening 31 is smaller than the radius of the region on the front side in the direction of travel during the closing operation, it is possible to achieve the above effect.

FIG. 9 is a cross-sectional view showing a schematic configuration of a measuring device 420 according to a third embodiment of the present invention. Hereinafter, points different from the first embodiment will be mainly described about the measuring device 420 , and points not particularly described are the same as those of the first embodiment. The metering device 420 includes a storage tank 430 , a supply door 440 , a metering tank 450 , and a load cell 52 . The supply door 440 is a slide type in this embodiment, and moves in the horizontal direction as indicated by arrow A6 to open and close the opening 431 of the storage tank 430 . At the front end in the traveling direction during the closing operation of the supply door 440 , a protruding portion 441 that moves on the movement locus 435 during the closing operation of the supply door 440 is formed. The protruding portion 441 forms a gap 453 between the supply door 440 and the weighing object 90 stored in the weighing tank 450 when the supply door 440 is closed. According to this configuration as well, the same effect as that of the first embodiment can be achieved. In addition, a scattering prevention wall 456 is provided as an option in the measuring tank 450 to prevent the weighing object 90 brought out by the supply door 440 from scattering to the outside of the measuring tank 50 .

As mentioned above, some embodiments of the present invention have been described, but the above-mentioned embodiments of the present invention are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the equivalents thereof are included in the present invention. In addition, each component described in the claims and the specification can be combined or omitted within a range in which at least a part of the above-mentioned problems can be solved, or in a range in which at least a part of the effect is achieved.

For example, any means can be used instead of the protrusions 41 and 441 as the gap forming means for forming the gaps 53 and 453 . For example, the gap forming means may be a means for blowing air along the lower surface of the supply door 40 , 440 after the supply door 40 , 440 is closed. Alternatively, the gap forming means may be an actuator that moves the storage tank 30, 430 upward after the supply door 40, 440 is closed.

In addition, the openings 31 and 431 may also be arranged outside (that is, above) the metering tanks 50 and 450 . Of course, the movement tracks of the lower surfaces of the supply gates 40 , 340 , 440 may also be located outside (that is, above) the metering tanks 50 , 450 . In this case, the scattering preventing wall 456 can also prevent the object 90 from scattering to the outside of the measuring tank 50 .

Explanation of reference numerals: 20, 420... metering device; 30, 430... storage tank; 31, 431... opening; 35, 335, 336, 435... moving track; 40, 340, 440... supply door; 41, 441... protrusion 50, 450...metering tank; 51...discharge port; 52...load cell; 53, 353, 453...gap; 54...outer edge; 55...main frame; 60...discharge door; 70...sensor; 80... Control unit; 90...measurement object; 341, 342...end; 343...fulcrum; 456...scatter prevention wall.

Claims (13)

1. a kind of metering device, which is characterized in that have:

Storagetank is used to store metering object, is formed with opening in the lower part of the storagetank；

Door is supplied, is used to be opened and closed the opening；And

Measuring tank is set to the position on the lower than the storagetank, for storing from the storagetank via the opening The metering object of supply, the measuring tank are supported on load cell,

The motion track setting of the lower surface of the supply door when on-off action of the supply door are as follows: at least in the opening It is located at the inside of the measuring tank in the region of underface.

2. metering device according to claim 1, which is characterized in that

Described be open is configured at the inside of the measuring tank.

3. metering device according to claim 1 or 2, which is characterized in that

Have gap and form unit, is used for after supplying the metering object to the measuring tank from the storagetank, When closing the supply door, between being formed between the supply door and the metering object for being stored in the measuring tank Gap.

4. metering device according to claim 3, which is characterized in that

It is direction of travel when closing movement in the supply door of the lower surface of the supply door that the gap, which forms unit, Front end side is set as from following table protruding portion outstanding downwards.

5. metering device according to claim 1 or 2, which is characterized in that

The supply door is configured to be pivoted centered on fulcrum,

The vertical section along pivotal orientation of the lower surface of the supply door is circular shape,

The radius that the circular shape is set as on front side of direction of travel when closing movement of the supply door is greater than the radius of rear side.

6. metering device described according to claim 1~any one of 5, which is characterized in that

The motion track is set as the end position on front side of direction of travel when closing movement of the supply door of the motion track In the position of the outer edge than the storagetank in the inner part.

7. metering device described according to claim 1~any one of 6, which is characterized in that have:

Whether sensor, the metering object for being able to detect specified amount or more are stored in the storagetank；With

Control unit controls the movement of the metering device,

The control unit is when being stored with the metering object of the specified amount or more in the storagetank, to open the supply Storagetank described in Men Bingcong controls the metering device to the mode that the measuring tank supplies the metering object.

8. metering device according to claim 7, which is characterized in that

The control unit when in the case where the storagetank is not stored with the metering object of the specified amount or more, with to Machine opens storagetank described in the supply Men Bingcong to the meter to after being stored with the metering object of the specified amount or more The first action mode that measuring tank supplies the metering object controls the metering device.

9. metering device according to claim 7, which is characterized in that

The control unit is not in the case where the storagetank is stored with the metering object of the specified amount or more, with needless to say Machine opens storagetank described in the supply Men Bingcong to the metering to being stored with the metering object of the specified amount or more The second action mode that slot supplies the metering object controls the metering device,

In the case where controlling the metering device with first action mode, it is since closing the supply door and being measured to Time setting only are as follows: than in the case where controlling the metering device with second action mode, from the closing supply Time of the door until starting metering is short.

10. a kind of metering device, which is characterized in that have:

Storagetank is used to store metering object, is formed with opening in the lower part of the storagetank；

Door is supplied, is used to be opened and closed the opening；And

Measuring tank is set to the position on the lower than the storagetank, for storing from the storagetank via the opening The metering object of supply, the measuring tank are supported on load cell,

The metering device is constituted are as follows: the metering object in the state that supply door is opened and in the storagetank In the state that object and the metering object being stored in the measuring tank are continuous, the supply door is closed, carries out institute later State the metering of load cell.

11. a kind of door, for being used for metering device, which is characterized in that have:

Door main body；With

Protruding portion, it is prominent from a face of the door main body.

12. a kind of door, for being used for metering device, which is characterized in that

Have the face in the vertical section with the circular shape,

The circular shape is set as being greater than the radius of the other side along the radius of the side of the circular shape.

13. a kind of working method of metering device, which is characterized in that have following process:

Prepare the process of metering device, which has: being formed with the storagetank of opening, for being opened and closed described open in lower part Mouthful supply door and be set to than storagetank position on the lower and be supported on the measuring tank of load cell；

First step opens the supply door, and the metering object for being stored in the storagetank is open via described to described Measuring tank supply；

The second step the metering object in the storagetank and is stored in the metering after the first step The supply door is closed under the continuous state of metering object in slot；And

The third step, after the second step, by the load cell to the metering object in the measuring tank It is measured.