JP6109667B2 - Weighing object supply device and weighing device provided with the same - Google Patents

Description

  The present invention includes an object supply device for supplying an object to be weighed such as powder (detergent, fertilizer, etc.) or granules (resin pellets, grain, feed, etc.) to a container such as a weighing hopper or bag, and the same. It relates to a weighing device.

  Conventionally, there is a weighing device called a packer scale as a device for filling an object to be weighed made of powder or granules into a container such as a bag (see Patent Documents 1 and 2, for example).

  Such a weighing apparatus includes, for example, a configuration including an object supply device having a cut gate and a weighing hopper to which an object to be weighed is supplied from the object supply device.

  Here, the weighing object supply apparatus has a cut gate that opens and closes the opening at the lower end of the cylinder filled with the object to be weighed, and the weighing object in the cylinder falls by opening the cut gate. Supplied to the weighing hopper. Here, the opening / closing operation of the cut gate is controlled so that an object to be weighed having a preset target weight value is supplied to the weighing hopper. The weighing hopper is configured to discharge the object to be measured to a container such as a bag after the final weight of the supplied object to be weighed is measured.

  In the weighing object supply device used in such a weighing device, for example, one using a single cut gate is the mainstream, but in order to improve the processing capability, they rotate simultaneously in opposite directions. Some use a pair of (two) cut gates that open and close.

  Further, the configuration in which the object supply device includes a pair of cut gates and at least one of the pair of cut gates is provided with a notch for small supply has been applied by the applicant. It is described in a weighing device (Japanese Patent Application No. 2012-61531). FIG. 7A shows a schematic configuration of a supply device (object supply device) provided in the weighing device of the proposed example. Moreover, FIG.7 (b) is a figure which shows the opening condition of a cut gate when the to-be-measured item supply apparatus in the same proposal example is a small supply state.

  7A is a pair of cut gates 2A for opening and closing the lower end opening 1a of the cylinder 1 filled with the object to be weighed through the opening 30a of the horizontal plate 30. 3A is provided. In FIG. 7A, a pair of cut gates 2A and 3A in the fully closed state is shown. In the pair of cut gates 2A and 3A, the central axis of rotation of the cut gate 2A (for example, the center line of the shaft 2a) and the central axis of rotation of the cut gate 3A (for example, the center line of the shaft 3a) are horizontal. The gears 4 and 4 are attached to the shafts 2a and 3a so as to mesh with each other, so that the first cut gate 2A and the second cut gate 3A are opposite to each other. It is configured to rotate simultaneously in the direction. By using such a pair of cut gates 2A and 3A, the open / close operation distance of each of the cut gates 2A and 3A is about ½ compared to the case of a single cut gate, and the open / close operation time can be shortened. And the processing speed can be improved.

  In addition, in order to improve the measurement accuracy, at least one of the pair of cut gates 2A, 3A is provided with a small supply cut-out portion (see, for example, the cut-out portion 2C in FIG. 2D). The cut gates 2A and 3A are opened widely to supply the objects to be weighed to the weighing hopper at a large flow rate (large supply state), and then the degree of opening of the pair of cut gates 2A and 3A is reduced to reduce the flow rate from the notches. To supply the objects to be weighed to the weighing hopper (small supply state).

JP 2004-125749 A Japanese Patent Laid-Open No. 2001-225594

  However, in the object supply device in the above-described proposal example, since the central axis of rotation of the cut gate 2A and the central axis of rotation of the cut gate 3A are arranged in parallel in the horizontal direction, the cut gate The size of the gap S in the overlap portion between the bottom plate portion 2B of 2A and the bottom plate portion 3B of the cut gate 3A is greatly different depending on the position in the overlap portion. Therefore, in the small supply state (see FIG. 2C) in which the cut gates 2A and 3A are slightly opened (see FIG. 2C), the overlap portion of the bottom plate portion 2B of the cut gate 2A and the bottom plate portion 3B of the cut gate 3A The smallest gap S1 is larger than when the cut gates 2A and 3A are completely closed (see FIG. 7B), and the object to be weighed from the gap S1 in the small supply state of the object to be weighed. May flow out, and the object to be weighed may flow out of the gap S1, which is a portion other than the original supply port (see the supply port SO in FIG. 2C), and the supply flow rate may become unstable. .

  The present invention has been made to solve the above-described problems, and provides an object supply device capable of stabilizing the supply flow rate in a small supply state and a measurement device including the same. It is an object.

  In order to achieve the above object, an object supply device according to an aspect of the present invention includes a cylinder body filled with an object to be measured, and a bottom plate used for opening and closing an opening at a lower end of the cylinder body. An object to be weighed that is filled in the cylinder when the first and second cut gates are opened. The first cut gate is configured to fall by its own weight from a supply port defined by the bottom plate portion and the opening of the first and second cut gates, and the first cut gate rotates around a first horizontal axis. The second cut gate is rotated around a second horizontal axis parallel to the first horizontal axis and positioned below the first horizontal axis, and the first and second When the cut gate of the first cut gate is closed, the bottom plate portion of the first cut gate The second is with the bottom plate portion of the cut gate is configured to form an overlapping portion.

  According to this configuration, the second horizontal axis that is the central axis of rotation of the second cut gate is parallel to the first horizontal axis that is the central axis of rotation of the first cut gate, and the first Since the first cut gate is closed when the first and second cut gates are closed, the bottom plate portion of the second cut gate and the bottom plate portion of the second cut gate The size of the gap in the overlapping portion can be made substantially the same and small regardless of the position in the overlapping portion. Therefore, a small supply notch portion is provided in at least one of the first and second cut gates, and the bottom plate portion of the first cut gate and the bottom plate portion of the second cut gate are provided. It is possible to prevent the weighed object from flowing out from the gap in the overlap part when it is overlapped and the object to be weighed falls from a part of the notch, that is, in the small supply state. In this case, the supply flow rate can be stabilized.

  The horizontal distance between the first horizontal axis and the second horizontal axis may be configured to be a predetermined distance or less.

  With this configuration, the gap between the overlap between the bottom plate portion of the first cut gate and the bottom plate portion of the second cut gate can be reduced.

  Further, when the first and second cut gates are shifted from the opened state to the closed state, the bottom plate portion of the first cut gate and the bottom plate portion of the second cut gate overlap each other. Between the time when the first cut gate and the second cut gate finish closing, the bottom plate portion of the first cut gate and the bottom plate portion of the second cut gate in the overlap portion. The gap may be configured to be substantially the same regardless of the position in the overlap portion.

  With this configuration, the gap between the overlap between the bottom plate portion of the first cut gate and the bottom plate portion of the second cut gate can be reduced.

  In addition, the bottom plate portion of the first cut gate is configured such that a cross section perpendicular to the first horizontal axis has an arc shape centered on the first horizontal axis, and the bottom plate of the second cut gate The section is configured such that a cross section perpendicular to the second horizontal axis is formed in an arc shape centered on the second horizontal axis, and a virtual plane including the first horizontal axis and the second horizontal axis includes: The first and second cut gates may be configured to intersect with the overlap portion when closed.

  With this configuration, the gap between the overlap between the bottom plate portion of the first cut gate and the bottom plate portion of the second cut gate can be reduced.

  Further, the second horizontal axis may be configured to be located immediately below the first horizontal axis.

  With this configuration, it is possible to further reduce the gap between the overlapping portions of the bottom plate portion of the first cut gate and the bottom plate portion of the second cut gate.

  Further, a bottom plate portion of at least one of the first and second cut gates may be provided with a notch portion in which a front end portion in the closing direction of the cut gate is notched.

  According to this configuration, the bottom plate portion of the first cut gate and the bottom plate portion of the second cut gate overlap, and the small supply state in which the object to be weighed is dropped from a partial region of the notch portion. Sometimes, it is possible to prevent the measurement object from flowing out from the gap in the overlap portion, and to stabilize the supply flow rate in the small supply state.

  Further, the first and second cut gates are greatly opened so that the size of the supply port becomes a predetermined first size at the start of supply, and the state of the supply port is temporarily maintained after the state is temporarily held. Is rotated in a direction to close the first and second cut gates until a predetermined second size smaller than the first size is reached, temporarily holding the state, and then the first and second When the size of the supply port is the second size, the first cut gate and the second cut gate overlap each other. And a controller for controlling the opening and closing operations of the first and second cut gates so that the object to be weighed falls from a part of the notch. Good.

  According to this configuration, in the small supply state, it is possible to prevent the measurement object from flowing out from the gap between the overlap between the bottom plate portion of the first cut gate and the bottom plate portion of the second cut gate. The supply flow rate during the state can be stabilized.

  Further, a weighing device according to an embodiment of the present invention is a weighing device that is supplied with the above-described object supply device and the object to be weighed falling from the object supply device and measures the weight of the object to be supplied. And a controller of the weighing object supply device is configured to supply a weighing object for a preset target weight value based on the weight of the weighing object to be weighed by the weighing means. An opening / closing operation of the first and second cut gates is controlled so as to be supplied from the apparatus to the weighing means.

  According to this configuration, the supply flow rate when the object supply device is in the small supply state can be stabilized, and the measurement accuracy can be improved.

  The present invention has the above-described configuration, and has an effect that it is possible to provide an object supply device capable of stabilizing the supply flow rate in a small supply state and a measurement device including the same. Play.

(A) is the schematic schematic diagram which looked at the measuring device of the example of 1 composition of an embodiment of the present invention from the front, (b) is the schematic schematic diagram which looked at the measuring device from the side, (c ) Is a schematic plan view of the main part of the weighing object supply device of the weighing device as viewed from above. (A)-(d) is the figure which looked at the open / close state from which the cut gate in one structural example differs, respectively from the top. It is a figure which shows the outline of an example of transition of the filling amount of the to-be-measured object to the weighing hopper in the weighing | measuring apparatus of one structural example. (A)-(d) is the figure which looked at the open / closed state from which the cut gate in a 1st modification differs, respectively from the top. It is the figure which looked at the cut gate at the time of the small supply state in a 2nd modification from the top. (A), (b) is a pair of cut gates when the rotation axis of the second cut gate is positioned below (not directly below) the rotation axis of the first cut gate. It is a schematic side view which shows an example of the state (fully closed state) closed. (A) is a figure which shows schematic structure of the to-be-measured object supply apparatus with which the weighing | measuring device of a proposal example is equipped, (b) is a cut gate when the to-be-measured object supply apparatus is a small supply state. It is a figure which shows the opening condition.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout all the drawings, and redundant description thereof is omitted. Further, the present invention is not limited to the following embodiment.

Embodiment
Fig.1 (a) is the schematic schematic diagram which looked at the weighing | measuring device of the one structural example of embodiment of this invention from the front, FIG.1 (b) is the schematic schematic diagram which looked at the same weighing device from the side. is there. Moreover, FIG.1 (c) is the schematic plan view which looked at the principal part of the to-be-measured object supply apparatus of the weighing | measuring apparatus from the upper direction. In the following, for convenience of explanation, as shown in FIGS. 1A and 1B, for example, “left”, “right”, “front”, and “rear” are determined from the viewpoint of the person viewing the device.

  The weighing device is provided with an object supply device Ms (hereinafter abbreviated as “supply device Ms”) for supplying an object to be weighed to the weighing hopper Mw, and is provided below the supply device Ms and supplied from the supply device Ms. It includes a weighing hopper (weighing means) Mw that temporarily holds an object to be weighed, measures its weight, and discharges it downward, and a controller 10 that controls the supply device Ms and the weighing hopper Mw. The objects to be weighed are powders (detergents, fertilizers, etc.) or granules (resin pellets, grains, feeds, etc.).

  The supply device Ms includes a cylindrical tube 1 standing in a vertical direction (vertical direction), and a first and second pair of cut gates 2 for opening and closing the opening 1a at the lower end of the tube 1. 3 and a gate drive motor (not shown) for opening and closing the pair of cut gates 2 and 3. In this example, as shown in FIG. 1A, dust-proof partition walls 41 and 42 (not shown in FIG. 1B) are appropriately disposed.

  The cylindrical body 1 has an upper end fixed to the horizontal plate 30, and the horizontal plate 30 is provided with a circular opening 30 a in accordance with the opening at the upper end of the cylindrical body 1. An object to be weighed supplied from above through the opening 30a of the horizontal plate 30 is filled into the cylindrical body 1.

  The pair of cut gates 2 and 3 are arranged so as to be able to open and close the opening 1 a at the lower end of the cylindrical body 1. The opening 1a at the lower end of the cylindrical body 1 is formed so as not to spill the object to be weighed according to the shape of the cut gates 2 and 3 when closed. The cut gates 2 and 3 continuously drop the objects to be weighed in the cylindrical body 1 from the lower end opening 1a when opened, and continuously drop the objects to be weighed when closed. The flow is cut off from both sides so as to close the lower end opening 1a.

  One first cut gate 2 has an arcuate bottom plate portion 2B whose section perpendicular to the rotation axis 2m (the center line of the shafts 2a and 2b) serving as the center of rotation is centered on the rotation axis 2m. A side plate portion 2Sa extending upward from the right end edge of the bottom plate portion 2B and connected to one end of a shaft 2a (hereinafter also referred to as “right shaft 2a”), and a shaft extending upward from the left end edge portion of the bottom plate portion 2B. 2b (hereinafter also referred to as “left shaft 2b”) and a side plate portion 2Sb connected to one end. The rotation axis 2m is a first horizontal axis. Both shafts 2a and 2b are disposed on a rotation axis 2m, and each of the two shafts 2a and 2b is rotatably supported by bearing portions 5a and 5b formed of bearings. That is, the cut gate 2 is rotatably provided around a first horizontal axis (rotation axis 2m) passing through the centers of both the axes 2a and 2b.

  Similarly, the other second cut gate 3 has an arc-shaped bottom plate whose section perpendicular to the rotation axis 3m (centerline of the shafts 3a and 3b) serving as the center of rotation is centered on the rotation axis 3m. Part 3B, side plate 3Sa connected to one end of shaft 3a (hereinafter also referred to as “right shaft 3a”) connected to the right end edge of bottom plate 3B and left end of bottom plate 3B And a side plate portion 3Sb connected to one end of a shaft 3b (hereinafter also referred to as “left shaft 3b”). The rotation axis 3m is a second horizontal axis that is parallel to and directly below the rotation axis 2m (first horizontal axis) described above. Both shafts 3a and 3b are disposed on a rotation axis 3m, and each of the shafts 3a and 3b is rotatably supported by bearing portions 6a and 6b formed of bearings. That is, the cut gate 3 is provided so as to be rotatable around a second horizontal axis (rotation axis 3m) passing through the centers of both shafts 3a and 3b.

  Gears 4 and 4 are attached so that the right shaft 2a of the first cut gate 2 and the right shaft 3a of the second cut gate 3 are engaged with each other, and similarly, the left shaft 2b of the first cut gate 2 And the gears 4 and 4 are attached to the left shaft 3b of the second cut gate 3 so as to mesh with each other, so that the first cut gate 2 and the second cut gate 3 are mutually connected. It is configured to rotate simultaneously in the reverse direction.

  The left shaft 2 b of the first cut gate 2 extends further to the left from the gear 4 and is connected to the drive shaft 8 via the coupling 7. In this example, the shaft 2b is connected to the drive shaft 8. However, any one of the four shafts 2a, 2b, 3a, 3b is connected to the drive shaft 8. It only has to be. The drive shaft 8 may be connected to a gate drive motor (not shown) through a gear box, or may be configured to be directly connected to the motor shaft of the gate drive motor. For example, an AC servo motor is used as the gate drive motor.

  The right two bearing portions 5 a and 6 a are attached to one bracket 31 a fixed to the lower surface of the horizontal plate 30, and the two left bearing portions 5 b and 6 b are fixed to the lower surface of the horizontal plate 30. The other bracket 31b is attached.

  The side plate portions 2Sa and 2Sb on both sides of the cut gate 2 and the side plate portions 3Sa and 3Sb on both sides of the cut gate 3 are provided with reinforcing members 2t and 3t, respectively. Well, it may be omitted. The reinforcing members 2t and 3t are not shown in FIG. 1C and FIGS. 2A to 2D described later.

  With the above configuration, for example, when the drive shaft 8 rotates in a predetermined direction from the state in which the cut gates 2 and 3 are closed, the left shaft 2b of the cut gate 2 is rotated, and the right shaft 2a is illustrated. By rotating clockwise in 1 (b), the cut gate 2 is rotated in the direction of the arrow a and the cut gate 2 is opened. At the same time, the left shaft 3b of the cut gate 3 is rotated and the right shaft 3a is rotated counterclockwise in FIG. 1B, whereby the cut gate 3 is rotated in the direction of the arrow b. The cut gate 3 is opened. When the cut gates 2 and 3 are closed, the drive shaft 8 rotates in the opposite direction to that described above, thereby performing the reverse operation. The controller 10 controls the gate drive motor to open or close the cut gates 2 and 3, and the drive shaft 8 is driven accordingly.

  That is, the cut gates 2 and 3 swing so that the respective bottom plate portions 2B and 3B draw a circular arc, and when the open gate is closed, the two bottom plate portions 2B and 3B are moved from the inside of the cylindrical body 1. The flow of the object to be weighed down is cut off from both sides so as to close the lower end opening 1a of the cylindrical body 1 (the lower end opening 1a is covered). For example, as shown in FIG. 1B, when the cut gates 2 and 3 are in a closed state (fully closed state), the closing directions of the bottom plate portions 2B and 3B of the respective cut gates 2 and 3 (with arrows a and b) It is configured to have an overlap portion OL in which the front end in the reverse direction and its vicinity are overlapped, and the lower end opening 1a of the cylinder 1 is closed, and the object to be weighed in the cylinder 1 is not discharged.

  Further, for example, as shown in FIG. 1 (c), the bottom plate portion 2B of the first cut gate 2 is notched so that the width becomes narrower from the front end edge 2Bf in the closing direction toward the direction opposite to the closing direction. A notch 2C is provided. This notch 2C is formed by notching the hatched portion of the broken line in FIG. 2 (d). Here, the notch 2C is cut from a width substantially equal to the width of the lower end opening 1a of the cylinder 1 (inner diameter of the cylinder 1). The gate 2 is formed so that the width gradually decreases in the direction opposite to the closing direction. Note that the widths of the notch 2C and the lower end opening 1a are dimensions in a direction (arrow e direction) orthogonal to the opening / closing direction of the cut gate 2, and the width of the notch 2C is, for example, FIG. This is a dimension corresponding to the length in the direction of arrow e of the hatched portion of the broken line in d).

  Here, the front end edge 3Bf of the bottom plate portion 3B of the second cut gate 3 is linear, and no notch is formed. The pair of cut gates 2 and 3 are fully closed by overlapping the front end edges 2Bf and 3Bf and the vicinity thereof.

  2 (a) to 2 (d) are diagrams showing different open / close states of the cut gates 2 and 3, respectively. FIG. 2 (a) shows an example of a large supply state, and FIG. ) Shows an example of the supply gradually decreasing state, FIG. 2C shows an example of the small supply state, and FIG. 2D shows the fully closed state (supply stop state).

  2 (a), 2 (b), and 2 (c), the hatched area is a discharge port through which an object to be weighed in the cylinder 1 is dropped and discharged by its own weight, that is, the cut gates 2 and 3 The supply port SO is defined by the lower end opening 1a of the cylindrical body 1. The supply port SO is a region in the opening 1a at the lower end of the cylindrical body 1 when the cut gates 2 and 3 are open (when not completely closed), and the cut gate 2 and the cut gate 2 are cut. It consists of a region sandwiched between the gate 3. 2A, 2B, and 2C, the object to be weighed in the cylinder 1 falls from the supply port SO by its own weight and is supplied to the weighing hopper Mw.

  The pair of cut gates 2 and 3, for example, when the object to be weighed is discharged from the fully closed state shown in FIG. 2D, first, the cut gates 2 and 3 are largely opened as shown in FIG. A large supply state is maintained, and then, after a supply gradually decreasing state (for example, the state of FIG. 2B) in which the cut gates 2 and 3 are gradually moved in a closing direction at a predetermined timing, the state shown in FIG. In this way, the small supply state in which the cut gates 2 and 3 are opened small is obtained, and then the cut gates 2 and 3 are completely closed at a predetermined timing, and the fully closed state shown in FIG.

  Below the cut gates 2 and 3 of the supply device Ms, a weighing hopper Mw that receives an object to be weighed discharged from the supply device Ms (cylinder 1) is disposed.

  The weighing hopper Mw has a hopper body having a discharge gate supported by a load cell, temporarily holds the object to be weighed supplied from the cylinder 1 in the hopper body, and discharges the object to be measured downward by opening the discharge gate. Is configured to do. The load cell or the like constitutes a weight sensor that measures the weight of the object to be weighed in the hopper body, and the weight value of the weight sensor is given to the controller 10. Here, the weighing hopper Mw includes a weight sensor such as a load cell. An object to be weighed discharged from the weighing hopper Mw is supplied to, for example, a packaging machine (not shown) and packed in a bag.

  The controller 10 is configured by, for example, a microcontroller and controls the entire weighing device. The controller 10 may be configured by a single control device that performs centralized control or may be configured by a plurality of control devices that perform distributed control in cooperation with each other.

  The controller 10 controls the open / close operation of the cut gates 2 and 3 by controlling the gate drive motor described above (that is, controls the supply device Ms). Further, the weighing value (the weight of the object to be weighed in the weighing hopper Mw) is obtained from the weight sensor of the weighing hopper Mw, and the opening / closing operation (that is, the discharging operation of the weighing hopper Mw) of the weighing hopper Mw is controlled.

  An example of the operation of the weighing device configured as described above will be described. Hereinafter, the weight of the object to be weighed in the weighing hopper Mw is also referred to as “filling amount”.

  FIG. 3 is a diagram showing an outline of an example of the transition of the filling amount of the object to be weighed into the weighing hopper Mw in this weighing apparatus, where the horizontal axis represents the time axis and the vertical axis represents the filling amount (weight). . In addition, here, transition of the filling amount in one operation cycle TC is shown, T1 is a period in which the cut gates 2 and 3 are in a large supply state (large supply period), and T2 is a period in which the cut gates 2 and 3 are It is a period of supply gradually decreasing (supply gradually decreasing period), T3 is a period when the cut gates 2 and 3 are in a small supply state (small supply period), and T4 is a stabilization waiting period for measuring the final filling amount. (Period required for the output signal of the weight sensor to become stable), and T5 is a period during which the object to be weighed is discharged from the weighing hopper Mw.

  During operation of the weighing device, the controller 10 always acquires the weight (filling amount) of the object to be weighed in the weighing hopper Mw from the weight sensor of the weighing hopper Mw at predetermined time intervals (for example, 10 ms). In addition, it is assumed that an object to be weighed is supplied to the supply device Ms from above the cylindrical body 1 into the cylindrical body 1 at any time, and the replenishment amount is sufficiently supplemented.

  When the operation of the weighing device is started, the controller 10 opens the cut gates 2 and 3 widely and starts supplying the objects to be weighed from the supply device Ms to the weighing hopper Mw. The large supply period T1 is from the start of supply until the filling amount reaches the first predetermined weight value W1, and in this large supply period T1, the cut gates 2 and 3 are set so that the supply port SO has a predetermined first size. It opens wide and maintains a large supply state (large supply state as shown in FIG. 2A). Here, the state in which the supply port SO has a predetermined first size is equivalent to a state in which the cut gates 2 and 3 are rotated by a predetermined first angle (α) in the opening direction from the fully closed state. .

  Next, after the filling amount reaches the first predetermined weight value W1, the controller 10 cuts the cut gates 2 and 3 so that the opening degree of the cut gates 2 and 3 gradually decreases as the filling amount increases. Is controlled to rotate in the closing direction. This control is performed based on a predetermined algorithm, and is performed so that the supply port SO has a predetermined second size when the filling amount reaches the second predetermined weight value W2. The period from when the filling amount reaches the first predetermined weight value W1 to when the filling amount reaches the second predetermined weight value W2 is the supply gradual decrease period T2. Here, the state in which the supply port SO has a predetermined second size is equivalent to a state in which the cut gates 2 and 3 are rotated by a predetermined second angle (β) in the opening direction from the fully closed state. . The second angle (β) is smaller than the first angle (α).

  Next, after the filling amount reaches the second predetermined weight value W2, the state where the supply port SO is in the second size is maintained (small supply state as shown in FIG. 2C). When the filling amount reaches a supply stop weight value W3 (not shown), which is a value obtained by subtracting the drop amount set value (predetermined value) from the target weight value Wt, the cut gates 2 and 3 are completely closed (see FIG. 2 in a fully closed state). The period until the cut gates 2 and 3 are completely closed after the filling amount reaches the second predetermined weight value W2 is the small supply period T3. Although the supply stop weight value W3 is not shown, the supply stop weight value W3 is a value that satisfies W2 <W3 <Wt, and is the final value after the cut gates 2 and 3 are fully closed. The filling amount is determined to be the target weight value Wt.

  Then, after the controller 10 determines that the final filling amount is measured after the stabilization period T4 (for example, a period set as a predetermined time) after the cut gates 2 and 3 are completely closed, The object to be weighed is discharged from the weighing hopper Mw (discharge period T5). Immediately after the discharge period T5, the next large supply period (T1) is entered, and thereafter the same operation is repeated under the control of the controller 10.

  When the central axes of the rotations of the pair of cut gates 2A and 3A are arranged in parallel in the horizontal direction as in the supply device in the proposed example shown in FIG. The size of the gap S in the overlap portion between the bottom plate portion 2B of the gate 2A and the bottom plate portion 3B of the cut gate 3A varies greatly depending on the position in the overlap portion. Therefore, when the cut gates 2A and 3A are slightly opened (see FIG. 2 (c)), the bottom plate portion 2B of the cut gate 2A and the bottom plate portion of the cut gate 3A are shown in FIG. 7 (b). The smallest gap S1 in the overlap portion with 3B becomes large, and the measurement object flows out from the gap S1, and the measurement object flows out from the part other than the original supply port, and the supply flow rate becomes unstable. There is a risk of becoming.

  On the other hand, in this embodiment, the rotation axis 2m of the first cut gate 2 and the rotation axis 3m of the second cut gate 3 are arranged in parallel in the vertical direction (vertical direction). . That is, the rotation axis 3m of the second cut gate 3 is positioned immediately below the rotation axis 2m of the first cut gate 2. When the first and second cut gates 2 and 3 are closed, the bottom plate portions 2B and 3B overlap, and in the overlap portion OL, the bottom plate portion 2B of the first cut gate 2 is the first one. It is comprised so that the inner side of the baseplate part 3B of 2 cut gates 3 may be met.

  With this configuration, the bottom plate portion 2B of the cut gate 2 and the bottom plate portion 3B of the cut gate 3 can be overlapped without interfering with each other, and the size of the gap of the overlap portion OL when closed can be reduced. Regardless of the position in the overlap portion OL (the position in the front-rear direction in FIG. 1B), it can be made substantially the same and small. Therefore, when the first and second cut gates 2 and 3 are shifted from the opened state to the closed state, the bottom plate portion 2B of the first cut gate 2 and the bottom plate portion 3B of the second cut gate 3 are Between the time when the overlap starts and the time when the first and second cut gates 2 and 3 finish closing, the bottom plate portion 2B of the first cut gate 2 and the bottom plate portion of the second cut gate 3 in the overlap portion. The gap with 3B is substantially the same regardless of the position in the overlap portion, and can be reduced. Therefore, even in the small supply state shown in FIG. 2 (c), the measurement object flows out from the gap between the overlap between the bottom plate portion 2B of the cut gate 2 and the bottom plate portion 3B of the cut gate 3 other than the supply port SO. And the supply flow rate in the small supply state can be stabilized. Therefore, the error between the final filling amount and the target weight value Wt can be made minute, and the measurement accuracy can be improved.

  Further, in the present embodiment, the notch 2C provided in the cut gate 2 has a width substantially the same as the width of the lower end opening 1a of the cylinder 1 (inner diameter of the cylinder 1), so that the closing direction of the cut gate 2 is By forming the width so as to narrow in the opposite direction, the rotation operation (for example, the operation in the supply gradual decrease period T2) from the state in which the cut gate 2 is largely opened to the closing direction can be performed smoothly. For this purpose, the maximum width of the notch 2C (the maximum dimension in the direction of arrow e in FIG. 2D) is set to the same width as the width of the lower end opening 1a of the cylinder 1 (inner diameter of the cylinder 1). It may be slightly smaller or larger than that. In addition, the cutout portion 2C has a trapezoidal shape in the cutout portion (broken hatched portion in FIG. 2D), but may have a triangular shape (V shape) or an arc shape.

  Further, since the bottom plate portion 2B of the cut gate 2 and the bottom plate portion 3B of the cut gate 3 can be overlapped without interfering with each other, the length of the overlap portion is increased, The length of the notch 2C in the opening / closing direction (rotation direction) can be increased, and the degree of freedom of the shape of the notch 2C can be improved. In addition, it is easy to increase the length of the overlap portion and provide notches in both cut gates 2 and 3 as in the following first and second modifications.

(First modification)
4 (a) to 4 (d) are diagrams showing the shape of the notch portion in the first modified example of the present embodiment, and are views showing different open / close states of the cut gates 2 and 3, respectively, from above. 4A shows an example of the large supply state, FIG. 4B shows an example of the supply gradually decreasing state, FIG. 4C shows an example of the small supply state, and FIG. 4D shows the fully closed state. The state (supply stop state) is shown.

  In this first modification, each cut gate 2, 3 has a substantially V-shape (mountain shape) that is notched so that the width decreases from the front end edges 2 Bf, 3 Bf in the closing direction toward the opposite direction to the closing direction. Notch portions 2C1 and 3C1 are provided. Any of the notches 2C1 and 3C1 has the same width as the width of the lower end opening 1a of the cylinder 1 (inner diameter of the cylinder 1), and the closing direction of the cut gates 2 and 3 is the same as the notch 2C described above. Is formed so that the width becomes narrower in the opposite direction, and the rotation operation (for example, the operation in the supply gradually decreasing period T2) from the state in which the cut gates 2 and 3 are largely opened to the closing direction is smoothly performed. Therefore, the supply gradual decrease period T2 can be shortened, and the processing capacity can be improved (the operation speed can be increased).

(Second modification)
FIG. 5 is a diagram showing the shape of the notch in the second modification of the present embodiment, and shows an example of a small supply state when the cut gates 2 and 3 are viewed from above.

  In the second modified example, in the bottom plate portions 2B and 3B of the respective cut gates 2 and 3, cutout portions 2C2 and 3C2 are provided at portions closest to the one side plate portions 2Sa and 3Sa.

  As described above, the shape of the notch can be variously changed.

  In the present embodiment, the rotation axis 3m of the second cut gate 3 is configured to be located immediately below the rotation axis 2m of the first cut gate 2. It doesn't matter. 6 (a) and 6 (b) are configured such that the rotational axis 3m of the second cut gate 3 is positioned below (not directly below) the rotational axis 2m of the first cut gate 2. It is a schematic side view which shows an example of the state (fully closed state) in which a pair of cut gates 2 and 3 were closed. Here, “left” and “right” (corresponding to “front” and “rear” in FIG. 1B) will be described as shown in FIGS. 6A and 6B.

  In the case of FIG. 6 (a), the rotation axis 3m of the second cut gate 3 is positioned slightly to the left of the rotation axis 2m of the first cut gate 2 in the drawing. In the case of FIG. 6B, the rotation axis 3m of the second cut gate 3 is positioned slightly to the right from directly below the rotation axis 2m of the first cut gate 2 in the figure. Yes. In either case, the two rotation axes 2m and 3m are parallel.

  6A and 6B, the horizontal distance Lb between the two rotation axes 2m and 3m is set to be a predetermined distance or less. For example, the horizontal distance Lb between the two rotation axes 2m and 3m is set to be 20% or less of the inter-axis distance La between the two rotation axes 2m and 3m. Thereby, compared with the case of the proposal example shown to Fig.7 (a), the magnitude | size of the clearance gap between overlap part OL1, OL2 is substantially irrespective of the position (position of the left-right direction) in overlap part OL1, OL2. It is possible to make them the same and small.

  6 (a) and 6 (b), the virtual planes P1 and P2 including the two rotation axes 2m and 3m are the bottom plate portion 2B of the cut gate 2 and the bottom plate of the cut gate 3. When the width (the length in the left-right direction) of the overlap portions OL1 and OL2 is set to a predetermined length (constant), it passes through a position that deviates from the overlap portions OL1 and OL2 with the portion 3B. It is preferable to further reduce the horizontal distance Lb between the two rotation axes 2m and 3m so that P1 and P2 intersect the overlap portions OL1 and OL2.

  As described above, the imaginary planes P1 and P2 including the two rotation axes 2m and 3m intersect with the overlap portions OL1 and OL2, so that the size of the gap between the overlap portions OL1 and OL2 can be reduced. It becomes maximum at a position where P1 and P2 and overlap portions OL1 and OL2 intersect, and becomes smaller as the distance from the position increases. For example, in the configuration illustrated in FIG. 6A, the size of the gap of the overlap portion OL1 is gradually decreasing from the left end to the right end of the overlap portion OL1. Further, in the configuration illustrated in FIG. 6B, the size of the gap of the overlap portion OL2 is increasing from the left end to the right end of the overlap portion OL1. In contrast, the horizontal distance Lb between the two rotation axes 2m and 3m is reduced so that virtual planes P1 and P2 including the two rotation axes 2m and 3m intersect the overlap portions OL1 and OL2. In this case, the size of the gap between the overlap portions OL1 and OL2 increases and decreases from the left end to the right end of the overlap portions OL1 and OL2, so that the maximum value of the gap in the overlap portions OL1 and OL2 The difference from the minimum value can be reduced. Therefore, compared with the configuration illustrated in each of FIGS. 6A and 6B, the size of the gap between the overlap portions OL1 and OL2 is set to a position (in the left-right direction) in the overlap portions OL1 and OL2. It can be made substantially the same regardless of the position) and can be made smaller.

  In any of the examples described above, the bottom plate portion 3B of the second cut gate 3 overlaps the outside of the bottom plate portion 2B of the first cut gate 2 with the rotation axis 2m above. As described above, the bottom plate portion 3B of the second cut gate 3 may be configured to overlap the inside of the bottom plate portion 2B of the first cut gate 2 with the rotation axis 2m above.

  In any of the above-described examples, the bottom plate portions 2B of the first and second cut gates 2 and 3 are directly below the rotation axes 2m and 3m of the first and second cut gates 2 and 3, respectively. 3B overlap portions OL, OL1, and OL2 exist.

  Moreover, in this embodiment, although it comprised so that the to-be-measured object discharged | emitted from supply apparatus Ms might be supplied to the weighing hopper Mw, it is not restricted to this. For example, an object to be weighed discharged from the supply device Ms is configured to be supplied to a bag through a funnel, and a weighing unit that supports the bag and measures the weight of the object to be weighed supplied to the bag is provided. It may be provided.

  INDUSTRIAL APPLICATION This invention is useful as a to-be-measured object supply apparatus which can aim at stabilization of the supply flow rate at the time of a small supply state, and a measuring apparatus provided with the same.

Ms object to be weighed device Mw weighing hopper SO supply port 1 cylinder 1a opening 2 at the lower end of the cylinder 1st cut gate 2B bottom plate 2m of the first cut gate rotation axis of the first cut gate (first 1 horizontal axis)
3 Second cut gate 3B Second cut gate bottom plate 3m Second cut gate pivot axis (second horizontal axis)
2Bf, 3Bf Front edge 2C, 2C1, 2C2, 3C1, 3C2 of cut gate in the closing direction Notch 10 Controller

Claims (8)

A cylinder filled with an object to be weighed;
Having a bottom plate part used for opening and closing the opening at the lower end of the cylindrical body, comprising first and second cut gates rotating in opposite directions to each other;
Supply that the object to be weighed filled in the cylinder when the first and second cut gates are opened is defined by the bottom plate portion and the opening of the first and second cut gates It is configured to fall by its own weight from the mouth,
The first cut gate pivots about a first horizontal axis, and the second cut gate is a second parallel to the first horizontal axis and positioned below the first horizontal axis. When the first and second cut gates are closed, the bottom plate portion of the second cut gate is over the outside of the bottom plate portion of the first cut gate. configured to form an overlap portion formed by lap,
Weighing object supply device. The horizontal distance between the first horizontal axis and the second horizontal axis is configured to be a predetermined distance or less.
The object supply device according to claim 1. When the first and second cut gates transition from the open state to the closed state, the bottom plate portion of the first cut gate and the bottom plate portion of the second cut gate begin to overlap. Between the bottom plate portion of the first cut gate and the bottom plate portion of the second cut gate in the overlap portion between the first cut gate and the second cut gate. Configured to be substantially the same regardless of the position in the overlap portion,
The object supply device according to claim 1. The bottom plate portion of the first cut gate is configured such that a cross section perpendicular to the first horizontal axis has an arc shape centering on the first horizontal axis, and the bottom plate portion of the second cut gate is A cross section perpendicular to the second horizontal axis is formed in an arc shape centered on the second horizontal axis;
A virtual plane including the first horizontal axis and the second horizontal axis is configured to intersect the overlap portion when the first and second cut gates are closed.
The object supply device according to claim 1. The second horizontal axis is configured to be located immediately below the first horizontal axis.
The to-be-measured item supply apparatus in any one of Claims 1-4. In the bottom plate portion of at least one of the first and second cut gates, a notch portion in which a front end portion in the closing direction of the cut gate is cut out is provided.
The to-be-measured item supply apparatus in any one of Claims 1-5. After opening the first and second cut gates so that the size of the supply port becomes a predetermined first size at the start of supply, and temporarily holding the state, the size of the supply port is The first and second cut gates are pivoted in a closing direction until the predetermined second size is smaller than the first size, the state is temporarily held, and then the first and second cuts are performed. The gate is closed, and in this control, when the size of the supply port is the second size, the first cut gate and the second cut gate overlap, and And a controller for controlling the opening and closing operations of the first and second cut gates so as to be in a small supply state in which an object to be weighed falls from a partial region of the notch,
The to-be-measured item supply apparatus of Claim 6. The weighing object supply device according to claim 7;
The weighing object is supplied from the weighing object supply device, and includes a weighing means for weighing the weight of the weighing object to be supplied.
The controller of the object supply device is:
Based on the weight of the weighing object to be weighed by the weighing means, the first and the first and the weighing objects are supplied from the weighing object supply device to the weighing means by a predetermined target weight value. Configured to control the opening and closing operation of the second cut gate,
Weighing device.

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