JP2009236527A - Weighing hopper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weighing hopper can accurately measure weight. <P>SOLUTION: The weighing hopper includes: an upper opening 12 and a lower opening 13 at an upper end portion and a lower end portion, respectively; a container 11 provided with a load cell attachment member 6 extending outwardly from the sidewall; a load cell 8 detachable from the load cell attachment member 6; a bottom plate 2 for opening and closing the lower opening 13 of the container 11; an urging means for urging the bottom plate 2 to the closing direction of the lower opening 13; and an opening means for opening the lower opening 13 by releasing the lower opening 13 from the urging means upon discharging an object. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a weighing hopper for accurately measuring the weight of contents such as a supplied granular material.

  Conventionally, a load measuring device such as a load cell is installed in the hopper in order to measure the weight of an object such as powder supplied into the hopper (see, for example, Patent Document 1). When an object such as powder is charged into the hopper, the weight of the charged object is measured by a load measuring device such as a load cell. In such a hopper, if the feeder on the input side is controlled so as to stop the supply at a preset weight, the object can be quantitatively supplied.

  The object supplied to the hopper is discharged when the bottom surface of the hopper is opened. The bottom surface is opened and closed by a telescopic mechanism such as a cylinder attached to the hopper or a rotating mechanism such as an electric motor (see, for example, Patent Document 2).

JP 2004-309244 A Registered Utility Model No. 3116436

  In a conventional weighing hopper device, a cylinder or an electric motor for opening and closing the bottom surface of the hopper is directly attached to the hopper. However, in order to drive a cylinder or an electric motor, a tube or an electric wire must be connected. In that case, there is a problem that an external force is applied to the weighing hopper via a tube or a cable, and the weight display is not accurate.

  An object of this invention is to provide the weighing hopper which can measure a weight correctly.

In order to achieve the above object, the present invention provides a weighing hopper for measuring the weight of a supplied object, having an upper opening and a lower opening at the upper end and the lower end, respectively, and attaching a load cell from the side wall to the outside. A container provided with a tool, a load cell that can be attached to and detached from the load cell mounting tool, a bottom plate that opens and closes a lower opening of the container, and a biasing means that biases the bottom plate in a direction to close the lower opening,
And opening means for releasing the biasing means to open the lower opening when the object is discharged. According to the present invention, when the metering is performed, that is, when the bottom plate is closed, the opening means is arranged away from each other, so that the external force is not received. Therefore, the weight of the object can be accurately measured without being affected by external force during measurement.

  Moreover, it is preferable to provide the moving means which moves the said container and separates the said load cell and the said load cell attachment tool in the position away from the said container except the time of a movement. Thus, when the weighing is not performed, that is, when the bottom plate opens the lower opening and discharges the object in the container, the horizontal plate generated when releasing the bias to the bottom plate by separating the container and the load cell. The influence of the load on the direction on the load cell can be prevented. Further, since the moving means is separated from the container except during the movement, an external force does not act on the container via the moving means at the time of weighing.

  The moving means may be a lifting cylinder that lifts the container upward, and the load cell may be installed below the load cell fixture.

  The biasing means is a gas spring connected to the bottom plate via a bracket member, and biases the bottom plate in a direction to close the lower opening via the bracket member by extension of the gas spring. But you can.

  The opening means is a release cylinder, and the extension of the release cylinder causes the gas spring to contract via the bracket member to release the bias to the bottom plate, so that the lower opening is opened. Good.

  Further, it is preferable that a resin coating is applied to the bottom plate. By coating with resin, the bottom of the container and the bottom plate can be more closely adhered to each other, so that accurate measurement can be performed while preventing the contents such as powder from leaking from the gap.

  According to the present invention, the weight of an object in a container can be accurately measured without being affected by external force.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 show a configuration of a weighing hopper 1 according to the present invention.

  A container 11 for storing an object such as a granular material has a shape in which a bottom of a quadrangular prism is cut obliquely with respect to a horizontal plane, an upper opening 12 in a horizontal plane at the upper end, and a lower opening in an oblique direction at the lower end. 13.

  A flange 14 is formed on the outer periphery of the upper opening 12. A rising cylinder 9 is provided in the vicinity of the upper opening 12 at a position away from the container 11. The ascending cylinders 9 are disposed, for example, at two opposing positions, and do not contact the container 11 when extended. When the raising cylinder 9 contracts, the locking portion 9a is locked to the lower surface of the flange 14, and the container 11 is lifted upward as shown in FIG. The lower opening 13 is normally closed by the bottom plate 2 that covers the entire lower opening 13.

  A load cell attachment 6 is provided on the side wall of the container 11 toward the outside of the container 11. The load cell 8 is disposed outside the container 11 and below the load cell attachment 6, and the tip of the load cell 8 is in contact with the load cell attachment 6. The load cell fixture 6 and the load cell 8 are detachable.

  As shown in FIG. 1, one end of the gas spring 3 is attached to the container 11 via a bracket 4. The other end of the gas spring 3 is connected to the bracket member 5.

  As shown in FIG. 5, the bracket member 5 has a gas spring bracket 5 a, a cylinder bracket 5 b, and a bottom plate bracket 5 c, which are linked via the same shaft 15. Further, when viewed in the plane direction, for example, as shown in FIG. 4, one cylinder bracket 5b is provided at the center of the shaft 15, and the gas spring bracket 5a and the bottom plate bracket 5c are arranged in pairs at symmetrical positions. The One end of the gas spring bracket 5 a is pivotally supported at the tip of the gas spring 3. The bottom plate bracket 5 c is fixed to the bottom plate 2.

  As described above, the gas spring 3 is connected to the bottom plate 2 via the gas spring bracket 5a and the bottom plate bracket 5c that are interlocked with each other. With the gas spring 3 extended, the bottom plate 2 is urged toward the bottom of the container 11 via the bottom plate bracket 5c, and the lower opening 13 is closed. Further, the bottom plate 2 is coated with a resin so that the sliding of powder or the like can be improved. Examples of such a resin include resins such as polyacetal (POM), polyamide (PA), and polytetrafluoroethylene (PTFE). Besides the resin, a sliding material such as TiN can be coated.

  The opening cylinder 7 is disposed at a position below the tip of the cylinder bracket 5b and away from the container 11. When the opening cylinder 7 is extended, the tip of the cylinder bracket 5b is lifted upward. Thereby, the gas spring 3 contracts via the gas spring bracket 5a interlocked with the cylinder bracket 5b, and the urging of the bottom plate 2 via the bottom plate bracket 5c is released. And the lower opening 13 is opened. While the opening cylinder 7 is extended, the open state of the lower opening 13 is maintained.

  An operation during weighing of the weighing hopper 1 having the above configuration will be described with reference to FIGS. 1 to 3.

  FIG. 1 shows a state at the time of weighing, in which the bottom plate 2 closes the lower opening 13 and the load cell 8 is in contact with the load cell attachment 6. At this time, since the container 11 is not subjected to an external force from the opening / closing mechanism or the like of the bottom plate 2, the value measured by the load cell 8 is the openness that is set apart from the container 11 among the constituent members of the weighing hopper 1. This is only the weight of the content that has been added, except for the cylinder 7 for lifting, the cylinder 9 for lifting, and the load cell 8.

  When the measurement is completed, as shown in FIG. 2, the ascending cylinder 9 contracts and the locking portion 9 a is locked to the lower surface of the flange 14. Since the load cell attachment 6 and the load cell 8 are not connected, the container 11, the bottom plate 2, the gas spring 3, the bracket member 5, and the load cell attachment 6 are lifted as the ascending cylinder 9 contracts, and the load cell 8 becomes the load cell. It will be in the state away from the fixture 6.

  When the contents in the container 11 are discharged, as shown in FIG. 3, the opening cylinder 7 expands and the cylinder bracket 5b is pushed up. As a result, the gas spring 3 contracts via the gas spring bracket 5a, and the bias of the bottom plate 2 via the bottom plate bracket 5c is released. At this time, a load is generated in the container 11 in the horizontal direction. However, since the load cell 8 is separated from the load cell attachment 6, the horizontal load does not act on the load cell 8.

  When the opening cylinder 7 contracts after the discharge of the contents in the container 11 is completed, the gas spring 3 expands, and the bottom plate 2 is again urged to the bottom of the container 11 as shown in FIG.

  Further, when the lifting cylinder 9 is extended, the locking portion 9a of the lifting cylinder 9 is separated from the flange 14 of the container 11 and no external force is applied to the container 11 as shown in FIG. The load cell attachment 6 comes into contact.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to. For example, the shape and arrangement of the bracket member 5 are not limited to the illustrated example.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a metering supply device that controls the supply amount by measuring the weight of contents such as a granular material.

It is a side view at the time of the measurement of the measurement hopper concerning this invention. It is a side view of the state where the container of the weighing hopper of FIG. 1 was lifted. It is a side view at the time of the content discharge | emission of the measurement hopper of FIG. It is the top view which looked at the measurement hopper of Drawing 1 from the upper part. It is an enlarged view of the bracket 5 of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Weighing hopper 2 Bottom plate 3 Gas spring 4 Bracket 5 Bracket member 5a Gas spring bracket 5b Cylinder bracket 5c Bottom plate bracket 6 Load cell mounting tool 7 Opening cylinder 8 Load cell 9 Lifting cylinder 11 Container 12 Upper opening 13 Lower opening 14 Flange 15 Shaft

Claims (6)

In the weighing hopper that measures the weight of the supplied object,
A container having an upper opening and a lower opening at the upper end and the lower end, respectively, and provided with a load cell attachment from the side wall to the outside;
A load cell detachable from the load cell fixture;
A bottom plate for opening and closing the lower opening of the container;
A biasing means for biasing the bottom plate in a direction to close the lower opening;
An opening means that is disposed away from the container and releases the biasing means to open the lower opening when the object is discharged;
A weighing hopper characterized by comprising:   The weighing hopper according to claim 1, further comprising a moving unit that moves the container to separate the load cell and the load cell attachment tool from a position apart from the container except during movement.   3. The weighing hopper according to claim 2, wherein the moving means is a lifting cylinder for lifting the container upward, and the load cell is installed below the load cell mounting tool.   The biasing means is a gas spring connected to the bottom plate through a bracket member, and biases the bottom plate in a direction to close the lower opening through the bracket member by extension of the gas spring. The weighing hopper according to any one of claims 1 to 3.   The opening means is an opening cylinder, and the extension of the opening cylinder causes the gas spring to contract via the bracket member to release the bias to the bottom plate, thereby opening the lower opening. 5. A weighing hopper according to claim 4, characterized in that   6. The weighing hopper according to claim 1, wherein a resin coating is applied to the bottom plate.

Images