JP2017138247A - Weight measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weight measuring device capable of calculating a systematic error in a short time without complicating the device.SOLUTION: A capsule weight selection device 1 includes: a touch panel indicator 50 for performing switching operation of an operation mode to a normal operation mode or a correction value acquisition mode for acquiring a correction value for correcting metering data; and a correction value acquisition part 41 for acquiring a correction value in the correction value acquisition mode. The correction value acquisition part 41 calculates an average value of a plurality of times of metering data acquired from a metering part 20 as a systematic error under an inspection condition in the operation mode and in a state an object W to be metered is not carried to the metering part 20 by operation of a conveyance part 10, and stores the calculated systematic error as a correction value to the metering data in the operation mode. The capsule weight selection device 1 includes the metering part 20 and the conveyance part 10 for a plurality of lines. The correction value acquisition part 41 reports an error when the systematic error exceeds a predetermined tolerance.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a weight measuring apparatus for weighing an object to be weighed with a small mass while conveying it.

  A weight measuring device is incorporated and used in a production line for foods, etc., and this weight measuring device is used to sequentially carry in the produced articles from the previous stage and to measure the carried articles in the weighing unit while conveying them. It has become.

  As a conventional weight measuring apparatus of this kind, the one described in Patent Document 1 is known. The thing of patent document 1 takes in the data of non-loading time, and when the data reaches a predetermined number, zero setting (update of a zero correction value) of a measurement part is carried out.

Japanese Patent No. 27063737

  Here, in a weight measuring device that weighs an object to be weighed, a steady vibration occurs due to the driving of the transport mechanism or the like during operation, and this vibration is superimposed on the weighing data as a systematic error that occurs reproducibly. To do.

  However, in a weight measuring device that measures a capsule-type tablet or the like as an object to be weighed, since the mass of the object to be weighed is small and high weighing accuracy is required, even a small systematic error needs to be corrected. was there.

  Conventionally, to solve this problem, the operator calculates the true value of the object to be weighed with a calibrated electronic balance, and calculates the systematic error as the result of comparing the weighing data of the object to be weighed with the true value. In addition, the obtained systematic error was input to the weight measuring apparatus by an input operation. Therefore, since the systematic error is calculated manually by the operator, it takes a long time to calculate the systematic error.

  On the other hand, it is possible to automatically correct the systematic error by providing a vibration sensor that measures the systematic error. However, in this case, the systematic error differs depending on the scale of the weighing unit. In the measuring apparatus, a vibration sensor must be provided for each scale, which causes a problem that the apparatus becomes complicated.

  Accordingly, the present invention has been made to solve the above-described conventional problems, and an object thereof is to provide a weight measuring apparatus capable of calculating a systematic error in a short time without complicating the apparatus. To do.

  The weight measuring apparatus according to the present invention includes a weighing unit (20) that measures a measurement object in the middle of a conveyance path and outputs measurement data, and the measurement object is intermittently synchronized with a measurement timing of the measurement unit. An operation mode switching operation to a normal operation mode or a correction value acquisition mode for acquiring a correction value for correcting the measurement data. A mode switching operation unit (50) that performs the correction value acquisition unit (41) that acquires the correction value in the correction value acquisition mode, the correction value acquisition unit, the inspection conditions in the operation mode, And, in the state where the object to be weighed is not conveyed to the weighing unit by the operation of the conveying unit, an average value of a plurality of measurement data acquired from the weighing unit is calculated as a systematic error, and the calculated system Error Wherein the rolling mode is stored as the correction value for the weighing data.

  With this configuration, the systematic error can be calculated in a short time because the operator does not need to calculate the systematic error manually or input it to the apparatus. Further, since the systematic error can be calculated without adding a vibration sensor or the like, the apparatus is not complicated. As a result, the systematic error can be calculated in a short time without complicating the apparatus.

  In addition, the weight measuring device according to the present invention includes the weighing unit and the transport unit for a plurality of lines.

  With this configuration, when the operator manually calculates a systematic error or inputs the error to the apparatus, it takes time for the number of inspection lines. Even in the case of provision, systematic errors can be calculated in a short time without complicating the apparatus.

  In the weight measuring device according to the present invention, the correction value acquisition unit performs error notification when the systematic error exceeds a predetermined allowable value.

  With this configuration, if the systematic error exceeds a predetermined allowable value, there is a possibility that the motor is worn or there is a suspicion of abnormality in the transport system and measurement cannot be performed normally. In such a case, error notification is performed. Thus, the operator can determine the state of the apparatus.

  Further, in the weight measuring device according to the present invention, switching to the correction value acquisition mode can be switched for each line, and the correction value acquisition unit systematically calculates the stored correction value and the newly calculated correction value. An error notification is performed when the difference from the error exceeds a predetermined allowable value.

  With this configuration, it is possible to diagnose a specified line without stopping the production of the entire plurality of lines for fluctuations in systematic errors caused by abnormalities inside and outside the apparatus that occur during production.

  The present invention can provide a weight measuring apparatus capable of calculating a systematic error in a short time without complicating the apparatus.

It is a figure which shows the external appearance of the capsule weight selection apparatus which concerns on one Embodiment of this invention, and is a perspective view which shows the state at the time of the door opening of a protective door. It is a figure which shows the external appearance of the capsule weight selection apparatus which concerns on one Embodiment of this invention, and is a perspective view which shows the state at the time of closing of a protective door. It is a side view which shows the internal structure of the capsule weight selection apparatus which concerns on one Embodiment of this invention. It is a side view which shows the structure of the selection part of the capsule weight selection apparatus which concerns on one Embodiment of this invention. It is a block diagram which shows the control circuit of the capsule weight selection apparatus which concerns on one Embodiment of this invention.

  Embodiments of a capsule weight sorting apparatus according to the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment of a capsule weight sorting apparatus according to the present invention.

  1 and 2, a capsule weight sorting device 1 as a weight measuring device is installed on the downstream side of a capsule-type tablet production line, and the weight of the object to be weighed W is set as the object to be weighed W. Is supposed to measure. A capsule-type tablet is a cylindrical capsule tablet in which a drug is enclosed and formed at both ends in a hemispherical shape. As a raw material of the object to be weighed W, gelatin, hydroxypropyl methylcellulose, or the like can be used. The object to be weighed W may be a non-capsule tablet or a food such as confectionery.

  In addition, the capsule weight sorting device 1 carries out the object W whose weighing data is within the reference range to the subsequent stage according to the measured value obtained by the measurement (hereinafter referred to as weighing data), and the weighing data is outside the reference range. The objects to be weighed are excluded from the production line.

  The capsule weight sorting apparatus 1 includes an apparatus main body 2 and protective doors 3, 4, and 5 that can be opened and closed with respect to the apparatus main body 2. The protective door 3 is provided in the upper front part of the apparatus main body 2, the protective door 4 is provided in the lower front part of the apparatus main body 2, and the protective door 5 is provided in the side surface of the apparatus main body 2.

  The protective doors 3, 4, and 5 cover an inspection line 8, which will be described later, provided inside the apparatus main body 2. The protective doors 3, 4, and 5 are made of a transparent resin plate or the like, so that the operating state of the inspection line 8 can be confirmed from the outside through the protective doors 3, 4, and 5. The apparatus main body 2 is provided with door opening sensors 3A, 4A, and 5A for detecting the open state of the protective doors 3, 4, and 5, respectively.

  Three hoppers 6 for temporarily storing long capsule tablets or the like supplied from the upper production line as the objects to be weighed W are provided on the upper part of the apparatus main body 2. Three inclined plates 7 are provided on the front surface of the apparatus main body 2.

  The upper surface of the inclined plate 7 constitutes an OK product transport path 31, and this OK product transport path 31 is determined to be a non-defective product by the capsule weight sorting device 1 among the objects W stored in the hopper 6. Is carried out to a lower production line (packaging process or the like) (not shown) through an opening 4B formed in the protective door 4.

  In FIG. 3, the apparatus main body 2 is provided with a plurality of inspection lines 8 each having a transport unit 10 and a weighing unit 20. In the present embodiment, the apparatus main body 2 includes 30 inspection lines 8. The inspection line 8 is partitioned so as to be parallel to the conveyance direction of the object to be weighed W, and the object to be weighed W is conveyed by using the inspection line 8 as a conveyance path.

  The transport unit 10 includes a magazine 9, a supply unit 62, a buffer unit 64, a transport member 80, and a drive mechanism unit 61. The magazine 9 stores the objects to be weighed W supplied by its own weight from the bottom of the hopper 6 so that the long side direction is aligned in the vertical direction. And the magazine 9 opens and closes a lower end part with the stopper (not shown) in a lower end part according to periodic up-and-down movement, and intermittently feeds one to-be-measured object W from the lower end part to the supply part 62. Transport. In the present embodiment, the sorting unit 30 is provided on the downstream side of the buffer unit 64 in the transport direction.

  The supply unit 62 conveys the workpiece W supplied from the magazine 9 to the weighing unit 20. The weighing unit 20 includes a weighing table 21, weighs the workpiece W transported from the transport unit 10 onto the weighing platform 21, and outputs weighing data corresponding to the load of the workpiece W.

The supply portion 62 is provided with a curved concave portion 68 immediately below the magazine 9, and the object to be weighed W that has dropped from the magazine 9 is landed on the curved concave portion 68 so that its axis is directed obliquely upward in the transport direction. It is held in an inclined position.
Further, a pusher 69 that is advanced in the transport direction is provided on the upstream side (right side in the drawing) of the curved recess 68, and the pusher 69 slides horizontally from the rear (right side in the diagram) of the curved recess 68. Thus, the workpiece W positioned in the curved recess 68 is sent to the weighing unit 20 on the downstream side in the transport direction.

  The weighing unit 20 is provided in the next process of the supply unit 62, and the objects W to be weighed out from the supply unit 62 are placed one by one, and the weight of one object W is measured. The measuring unit 20 includes a measuring device having a weighing table 21.

  The placement surface 21A of the weighing platform 21 has a V-shaped cross section that is orthogonal to the transport direction. The weighing platform 21 is supported by the measuring device by a Roberval mechanism. The Roverval mechanism has a parallelogram framework in which each side can move freely.

  The weighing table 21 is attached to one column of the frame, and the weighing sensor has the other column as a fixed end. Thereby, the exact weight is measured no matter what position of the weighing table 21 the workpiece W is placed on.

  The measuring device has, for example, a load cell (not shown) as a weighing sensor. When the object to be weighed W is placed on the weighing platform 21, the weight of the object W to be weighed is measured by the electric signal of the load cell to which a load is applied. The weighing sensor is not limited to the load cell, and other various weighing sensors can be used.

  The buffer unit 64 is provided in the next step of the weighing unit 20, and separates and holds at least one object to be weighed W that has been measured. The object to be weighed W is placed on the buffer unit 64 in a stationary state substantially in accordance with the measurement timing of the weighing unit 20.

  The buffer unit 64 includes a mounting table 65 that holds the workpiece W by mounting. In the present embodiment, a plurality of mounting tables 65 are formed in a staircase shape, and the objects to be weighed W are separated by each mounting table 65 and are transported intermittently.

  The sorting unit 30 is provided in the next process of the buffer unit 64. When the weighing object W is conveyed from the buffer unit 64, the sorting unit 30 switches the conveyance destination of the weighing object W based on the measurement result from the weighing unit 20.

  As described above, in the capsule weight sorting apparatus 1, the supply unit 62, the weighing unit 20, and the buffer unit 64 are disposed adjacently from the upstream side in the transport direction to the downstream side in the transport direction. In the present embodiment, the supply unit 62, the weighing unit 20, and the buffer unit 64 are flat in the horizontal direction, and a plurality of objects to be weighed W are intermittently and continuously conveyed one by one.

  The conveying member 80 is formed with a structure having a downward space such as an E-shape. In this configuration example, there are a plurality of claw portions that protrude downward, and the rear claw portion 81, the middle claw portion 82, and the front claw portion 83 hang downward from the upstream side in the transport direction, for example, bending a metal plate Manufactured as a unitary structure by processing.

  Between the middle nail | claw part 82 and the front nail | claw part 83, it becomes the space which can accommodate the to-be-measured object W in the axial direction. More specifically, in this space, the middle claw part 82 and the front claw part 83 are separated so that the object to be weighed W can be accommodated with a sufficient margin in the axial direction. It is set equal to or slightly longer than the length in the transport direction.

  The conveying member 80 can prevent the workpiece W from escaping and jumping out by the rear claw portion 81, the middle claw portion 82, the front claw portion 83, and the upper wall portion 84. Further, a gap 85 is provided between the middle nail portion 82 and the rear nail portion 81.

  The gap 85 is a space for separating the objects to be weighed W one by one, and a plurality of objects to be weighed W are intermittently conveyed without contact with each other. 62, the weighing unit 20 and the buffer unit 64 are reliably placed on the weighing object W, and when the weighing object W in the loaded state is started to be transported, the claw portions 81 between the weighing objects W, A space that allows 82 and 83 to enter is formed.

  The front surface of the middle claw portion 82 presses the rear surface of the weighing unit 20 in the transport direction of the object W to carry the object W placed on the weighing unit 20 from the weighing unit 20.

  The front surface of the front claw part 83 presses the rear surface in the transport direction of the object W to be weighed placed on the buffer part 64 adjacent to the weighing part 20, and the object W of the buffer part 64 is moved to the weighing part 20 of the buffer part 64. Is transferred from the mounting table 65 adjacent to the next mounting table 65.

  The rear surface of the rear claw part 81 is spaced upstream of the front surface of the middle claw part 82 in the transport direction. The rear surface of the rear claw portion 81 restricts the weighing object 20 from projecting toward the conveying direction side from the curved concave portion 68 of the next object to be weighed W that is dropped into the curved concave portion 68.

  In addition, the rear surface of the rear claw portion 81 is moved to the next object coming from the curved recess 68 when the object W on the weighing unit 20 is pushed out to the buffer portion 64 as the next process portion by the front surface of the middle claw portion 82. The protruding from the measuring unit 20 to the downstream side is regulated so that the weighing object W stays in the measuring unit 20.

  The rear surface of the front claw portion 83 has a mounting table 65 adjacent to the weighing unit 20 so that the next object to be weighed W conveyed to the buffer unit 64 remains on the mounting table 65 adjacent to the weighing unit 20 of the buffer unit 64. And jumping out to the mounting table 65 on the downstream side is restricted. In the present embodiment, the downstream side in the transport direction of the front claw portion 83 is the front surface of the front claw portion 83, and the upstream side in the transport direction of the front claw portion 83 is the rear surface of the front claw portion 83.

  The conveying member 80 moves on a substantially square circulation track 86 by a drive mechanism unit 61 described later. The circulation trajectory 86 includes a feed trajectory in which the moving trajectory for transporting the workpiece W by the transport member 80 is set in the horizontal direction, a separation trajectory separating from the feed trajectory, and a return trajectory for horizontally moving the transport member 80 to the lowered position. And a descending track that moves the conveying member 80 down on the weighing platform 21 from the lowered position, which is the end of the return track, and moves it to the starting point of the feeding track.

  The feed trajectory overlaps with the linear transport trajectory of the workpiece W. Thereby, the conveyance member 80 cuts out the to-be-measured object W on a conveyance track | truck from the measurement part 20 so that it may scrape out from upper direction, and conveys it to the buffer part 64. FIG. Therefore, it is not necessary to project any feeding means from the lower side of the conveyance track. As a result, there is no interference with the weighing platform mechanism of the weighing device.

  The drive mechanism unit 61 includes a motor 78 that is a drive source and a link 79 that is linked to the motor 78. The drive mechanism unit 61 conveys the workpiece W received from the hopper 6 from the supply unit 62 to the weighing unit 20.

  Further, the drive mechanism unit 61 conveys the measured object W to the buffer unit 64 and the sorting unit 30. Moreover, the gate which will be described later is driven so that the sorting unit 30 switches the transport destination of the object W to be weighed.

  Further, the drive mechanism unit 61 drives the conveying member 80 with the circulation track 86. The conveying member 80 is driven by the drive mechanism unit 61, so that the conveying member 80 is moved so that a part of the circulation track 86 is overlapped with the conveying track of the object W to be weighed.

  The link 79 of the drive mechanism unit 61 is linked to the pusher 69 of the supply unit 62 and the stepped mounting table 65 of the buffer unit 64 by a mechanism (not shown), and the transport member 80 is linked to the link member by a connecting member (not shown). These are driven synchronously.

  A transport operation of the transport unit 10 having the above configuration will be described. In the capsule weight sorting apparatus 1 according to the present embodiment, first, the unloading of the object to be weighed W placed on the weighing table 21 of the weighing unit 20 is started by the feeding track of the conveying member 80.

  At the same time, the pusher 69 pushes the next object to be weighed W from the supply unit 62 toward the weighing table 21. At this time, the conveying member 80 starts to carry out the object W to be weighed from the buffer unit 64. The conveyance member 80 pushes the rear surface in the conveyance direction of the object W on the weighing platform 21 with the front surface of the middle claw portion 82, and pushes the rear surface in the conveyance direction of the object W on the buffer portion 64 with the front surface of the front claw portion 83. , Carry out each.

  Thereafter, the object to be weighed W on the weighing platform 21 and the object to be weighed W on the mounting table 65 are in the process of being carried out by the conveying member 80. Thereafter, the conveyance member 80 and the pusher 69 move in the conveyance direction, so that the object W to be weighed on the weighing platform 21 is in the middle of conveyance to the buffer unit 64, and the object to be weighed W on the supply unit 62 is conveyed to the weighing table 21. On the way.

  When the transport member 80 and the pusher 69 are further moved in the transport direction, the object W to be weighed on the weighing platform 21 reaches the buffer unit 64. Further, the next object W to be weighed in the supply unit 62 reaches the weighing platform 21.

  Thereafter, the object W to be weighed on the mounting table 65 adjacent to the weighing unit 20 of the buffer unit 64 is conveyed to the next mounting table 65, and the next object to be weighed W is mounted on the weighing table 21 by the pusher 69. . The object to be weighed W placed on the weighing platform 21 is placed on the placing table 65 adjacent to the weighing unit 20 of the buffer unit 64 by the transport member 80.

  When the weighing object 21 is placed on the weighing table 21 and the loading table 65 adjacent to the weighing unit 20 of the buffer unit 64, the weighing object W on the weighing table 21 is measured. At this time, the transport member 80 becomes a separation track of the circulation track 86, moves upward, and retreats from the transport track.

  During the measurement of the next object to be weighed on the weighing platform 21, the next object to be weighed W is further supplied from the upstream side in the conveying direction to the supply unit 62, and the conveying member 80 passes through the return path and passes through the object to be weighed on the weighing platform 21. It reaches above the weighing object W.

  The object to be weighed W supplied to the supply unit 62 is conveyed to the weighing unit 20 by the pusher 69, and thereafter the same operation as described above is repeated.

  Accordingly, the weighing object W of the supply unit 62 is conveyed toward the weighing unit 20, and the weighing object W of the weighing unit 20 is unloaded from the weighing unit 20 by the front surface of the middle claw portion 82 of the conveying member 80. It is conveyed to. These conveyances are performed synchronously.

  In this capsule weight sorting device 1, the weighing object W can be reliably kept in the weighing unit 20 without providing a shutter for preventing the popping out, the conveyance speed can be increased, and the weighing object W is weighed. The platform 21 can be stopped accurately and stable weighing can be performed, and jumping of the workpiece W carried out of the weighing unit 20 to the downstream side in the transport direction can be restricted.

  In FIG. 4, the sorting unit 30 includes an OK product transport path 31, an NG product transport path 32, a + NG product transport path 33 and a −NG product transport path 34, an OK / NG gate 23, and a + NG / −NG gate 24. .

  The NG product transport path 32, the + NG product transport path 33, and the −NG product transport path 34 are formed inside the inclined plate 7 constituting the OK product transport path 31. The NG product conveyance path 32 is formed inside the upper part of the inclined plate 7 so as to be substantially parallel to the OK product conveyance path 31.

  A + NG product transport path 33 and a −NG product transport path 34 are formed in parallel at the lower end of the NG product transport path 32. That is, the NG product conveyance path 32 is branched into a + NG product conveyance path 33 and a -NG product conveyance path 34 below the NG product conveyance path 32.

  An OK / NG gate 23 is provided in the vicinity of the upper ends of the OK product transport path 31 and the NG product transport path 32. A measuring unit 20 (see FIG. 3) is disposed inside the OK / NG gate 23 (rightward in FIG. 4).

  The OK / NG gate 23 has an OK position (shown by a solid line in FIG. 4) whose top surface is continuous with the OK product transport path 31 and an NG position (shown by a broken line in FIG. 4) that is continuous with the NG product transport path 32. It is designed to rotate between The OK / NG gate 23 guides the workpiece W to the OK product transport path 31 when in the OK position, and guides the workpiece W to the NG product transport path 32 when in the NG position.

  A + NG / −NG gate 24 is provided at the lower end of the NG product transport path 32. The + NG / -NG gate 24 closes the + NG product transport path 33 and connects the NG product transport path 32 and the -NG product transport path 34 to the -NG position (shown by a solid line in FIG. 4), and -NG product transport. It is configured to rotate between a + NG position (indicated by a broken line in FIG. 4) that closes the path 34 and communicates the NG product transport path 32 and the + NG product transport path 33.

  The + NG / −NG gate 24 guides the object W to be measured from the NG article conveyance path 32 to the + NG article conveyance path 33 at the + NG position, and moves the article W from the NG article conveyance path 32 at the −NG position. -It guides to the NG article conveyance path 34.

  The OK product transport path 31, the NG product transport path 32, the + NG product transport path 33, and the -NG product transport path 34 constitute a sorting unit 30. The object to be weighed W is transported by flowing down the OK product transport path 31, the NG product transport path 32, the + NG product transport path 33, and the -NG product transport path 34 by its own weight.

  Further, the apparatus main body 2 includes an OK side sorting confirmation sensor 31A, a + NG side sorting confirmation sensor 33A, a -NG side sorting confirmation sensor 34A, an OK / NG gate sensor 23A, a + NG / -NG gate sensor 24A, a control circuit 40, and a touch panel. A display 50 is provided.

  The OK-side sorting confirmation sensor 31 </ b> A is provided at the upper end of the OK product conveyance path 31, detects that the object W has passed through the OK product conveyance path 31, and outputs a detection signal to the control circuit 40. It has become.

  The + NG side sorting confirmation sensor 33A is provided in the + NG product transport path 33, detects that the object W has passed through the + NG product transport path 33, and outputs a detection signal to the control circuit 40. Yes.

  The -NG side sorting confirmation sensor 34A is provided in the -NG product transport path 34, detects that the object W has passed through the -NG product transport path 34, and outputs a detection signal to the control circuit 40. It has become.

  The OK / NG gate sensor 23A is provided in the vicinity of the OK / NG gate 23, detects whether the OK / NG gate 23 is in the OK position or the NG position, and outputs a detection signal to the control circuit 40. It is like that.

  The + NG / −NG gate sensor 24A is provided at the rotation fulcrum of the + NG / −NG gate 24, detects whether the + NG / −NG gate 24 is in the + NG position or the −NG position, and outputs a detection signal. It outputs to the control circuit 40.

  The control circuit 40 controls the operation of the entire capsule weight sorting apparatus 1. The control circuit 40 includes an OK side sorting confirmation sensor 31A, a + NG side sorting confirmation sensor 33A, a -NG side sorting confirmation sensor 34A, an OK / NG gate sensor 23A, a + NG / -NG gate sensor 24A, and door opening sensors 3A, 4A, 5A. And are electrically connected.

  The control circuit 40 is electrically connected to an actuator (not shown) included in the OK / NG gate 23 and the + NG / −NG gate 24, and controls the operation of the OK / NG gate 23 and the + NG / −NG gate 24. It is like that.

  As shown in FIG. 5, the capsule weight sorting apparatus 1 includes a control circuit 40. The control circuit 40 includes a determination unit 43. The determination unit 43 compares the weighing data of the weighing unit 20 of each inspection line 8 with a predetermined weight range so that the object to be weighed W is an OK product, a + NG product, -A determination is made on one of the NG products, and the determination result is displayed on the touch panel display 50.

  The determination unit 43 determines that the weighing data of the object to be weighed W is within a predetermined non-defective product range as an OK product. The control circuit 40 switches the OK / NG gate 23 to the OK position according to the determination of the OK product. As a result, the weighed object W passes through the OK product conveyance path 31.

  On the other hand, the determination unit 43 determines that the weighing data of the object to be weighed W exceeds the upper limit of the predetermined non-defective product range as a + NG product. The control circuit 40 switches the OK / NG gate 23 to the NG position and switches the + NG / −NG gate 24 to the + NG position according to the determination of the + NG product. As a result, the weighed object W passes through the NG article conveyance path 32 and the + NG article conveyance path 33.

  Moreover, the determination part 43 determines that the weighing data of the to-be-measured object W is less than the minimum of the predetermined non-defective range as a -NG product. The control circuit 40 switches the OK / NG gate 23 to the NG position and switches the + NG / -NG gate 24 to the -NG position according to the determination of the -NG product. As a result, the weighed object W passes through the NG product transport path 32 and the -NG product transport path 34.

  Since such a capsule weight sorting apparatus 1 includes the motor 78 as a drive source for transporting the workpiece W, steady vibration occurs when the motor 78 is driven. For this reason, when the transport system is operating, a steady error due to steady vibration is superimposed on the weighing data as a systematic error. The systematic error is zero when the motor 78 is not driven, but is always superimposed on the weighing data at a constant value when the motor 78 is driven (ie, during operation). The systematic error value is an error specific to each inspection line 8 and is different for each inspection line 8. The systematic error changes according to the conveyance speed, and inspection conditions such as the conveyance speed are set for each type of inspection object. For this reason, the systematic error is an error inherent to the type of the object to be weighed W and the inspection condition.

  In the capsule weight sorting apparatus 1, since the object to be weighed W is a capsule-type tablet or the like, it is required to measure with high accuracy. In addition, since an object to be weighed such as a capsule-type tablet is lightweight, even a slight systematic error may cause a deterioration in weighing accuracy that cannot satisfy the requirement. For this reason, it is further required to correct the systematic error as compared with a weight sorting device of a type in which an object to be weighed W such as food is measured while being conveyed by a belt conveyor. At that time, it is required not to complicate the apparatus or take a long time for preparation (calculation) of correction of systematic errors.

  In the present embodiment, the capsule weight sorting device 1 is switched to the correction value acquisition mode to acquire a systematic error, and the measurement data is corrected in the operation mode using the acquired systematic error.

  In the present embodiment, the capsule weight sorting apparatus 1 includes a touch panel display 50 as a mode switching operation unit. By operating the touch panel display 50, the weighing, determination, and selection of the object W are performed. The operation mode is switched between a normal operation mode to be performed and a correction value acquisition mode for acquiring a correction value for correcting the measurement data in the operation mode. Further, the switching to the correction value acquisition mode can be performed for each inspection line 8, and the touch panel can be used while all the inspection lines 8 are weighing, determining quality, and selecting the weighing object W in the operation mode. By operating the display device 50, only the designated line can be switched to the correction value acquisition mode.

  The control circuit 40 includes a mode switching control unit 42. The mode switching control unit 42 performs mode switching to the operation mode selected by the touch panel display 50 in response to a mode switching operation on the touch panel display 50. . In the present embodiment, the touch panel display 50 also functions as a notification unit that performs error notification.

  The control circuit 40 includes a correction value acquisition unit 41 that acquires a correction value in the correction value acquisition mode. The correction value acquisition unit 41 includes a calculation unit 41A that calculates a systematic error, a storage unit 41B that stores the calculated systematic error as a correction value, and a correction unit that corrects the measurement data using the systematic error as a correction value. 41C.

  41 A of calculation parts are the test conditions in driving | operation mode, and the measurement data of multiple times acquired from the measurement part in the state by which the to-be-measured object W is not conveyed to the measurement part 20 by operation | movement of the conveyance part 10 based on the test conditions. The average value is calculated as a systematic error.

  In the present embodiment, the calculation unit 41A performs the conveyance operation and the measurement operation for 60 times in a state where the object to be weighed W is not conveyed to the measurement unit 20 after the zero setting of the measurement unit is performed. Then, the calculation unit 41A calculates an average value of 60 pieces of measurement data acquired by the measurement operation as a systematic error.

  The storage unit 41B stores the systematic error calculated by the calculation unit 41A as a correction value to the weighing data in the operation mode. The systematic error as the correction value is stored in association with the inspection condition when calculated by the calculation unit 41A. Inspection conditions include transport speed, weighing timing, and the like.

  In the operation mode, the correction unit 41C reads a systematic error corresponding to the inspection condition from the storage unit 41B, and corrects the measurement data using the read systematic error as a correction value.

  Further, the correction value acquisition unit 41 includes a diagnosis unit 41D. The diagnosis unit 41D performs error notification when the systematic error calculated by the calculation unit 41A exceeds a predetermined allowable value. The diagnosis unit 41D performs error notification by displaying on the touch panel display 50. The diagnosis unit 41D may perform error notification by voice from a speaker or the like (not shown).

  Further, when only the designated line is switched to the correction value acquisition mode from the state where all the inspection lines 8 are in the operation mode, the drive mechanism unit 61 operates in the operation mode as it is, so that the correction value acquisition unit 41 is The stopper is controlled so as to close the lower end of the magazine 9 so that the article W to be weighed is not conveyed from the magazine 9 to the weighing unit 20 via the supply unit 62 with respect to the designated line. Thereafter, with respect to the designated line, the calculation unit 41A calculates an average value of a plurality of measurement data acquired from the measurement unit 20 as a systematic error, and the diagnosis unit 41D calculates the systematic value calculated by the calculation unit 41A. The difference between the error and the correction value stored in the storage unit 41B is taken, and an error notification is performed when the magnitude of the difference exceeds a predetermined allowable value.

  In the present embodiment, the case where the present invention is applied to the capsule weight sorting apparatus 1 as a weight measuring apparatus has been described. However, the present invention conveys and weighs food or the like having a relatively heavy mass as an object to be weighed. The present invention can also be applied to a weight measuring device.

  In other words, in a weight measuring device that measures an object to be weighed while it is being transported, steady vibration is generated from the transport mechanism or the like during operation of the device, and this steady vibration may cause a systematic error. Therefore, it is desirable to correct the systematic error regardless of the required inspection accuracy.

  As described above, the capsule weight sorting apparatus 1 according to the present embodiment performs the operation mode switching operation to the normal operation mode or the correction value acquisition mode for acquiring the correction value for correcting the weighing data. The display 50 includes a correction value acquisition unit 41 that acquires a correction value in the correction value acquisition mode.

  Then, the correction value acquisition unit 41 systematically calculates the average value of the measurement data for a plurality of times acquired from the measurement unit 20 in the state where the inspection object in the operation mode and the workpiece W are not conveyed by the operation of the conveyance unit 10. The calculated systematic error is stored as a correction value for the weighing data in the operation mode.

  With this configuration, the systematic error can be calculated in a short time because the operator does not need to calculate the systematic error manually or input it to the apparatus. Further, since the systematic error can be calculated without adding a vibration sensor or the like, the apparatus is not complicated. As a result, the systematic error can be calculated in a short time without complicating the apparatus.

  Moreover, the capsule weight sorting apparatus 1 according to the present embodiment includes a plurality of weighing units 20 and a transport unit 10 for a plurality of lines.

  With this configuration, when the operator manually calculates a systematic error or inputs the error to the apparatus, it takes work time by the number of inspection lines 8, but in this embodiment, the weighing unit 20 and the transport unit Even when 10 is provided for a plurality of lines, a systematic error can be calculated in a short time without complicating the apparatus.

  In the capsule weight sorting apparatus 1 according to the present embodiment, the diagnosis unit 41D of the correction value acquisition unit 41 performs error notification when the systematic error exceeds a predetermined allowable value.

  With this configuration, if the systematic error exceeds a predetermined allowable value, the motor 78 may be worn or there may be an abnormality in the transport system, and normal measurement may not be possible. In such a case, error notification is performed. As a result, the operator can determine the state of the apparatus.

  In addition, the capsule weight sorting device 1 according to the present embodiment can switch to the correction value acquisition mode for each line, and the correction value acquisition unit 41 newly calculates the stored correction value. An error notification is performed when the difference from the systematic error exceeds a predetermined allowable value.

  With this configuration, it is possible to diagnose a specified line without stopping the production of the entire plurality of lines for fluctuations in systematic errors caused by abnormalities inside and outside the apparatus that occur during production.

  As described above, the weight measuring device according to the present invention has an effect that a systematic error can be calculated in a short time without complicating the device, and measures an object to be measured using a plurality of inspection lines. It is useful as a weight measuring device.

1 Capsule weight sorting device (weight measuring device)
DESCRIPTION OF SYMBOLS 10 Conveyance part 20 Weighing part 41 Correction value acquisition part 41A Calculation part 41B Storage part 41C Correction part 41D Diagnosis part 50 Touch panel display (mode switching operation part)
W Object to be weighed

Claims (4)

A weighing unit (20) for weighing an object to be weighed in the conveyance path and outputting weighing data;
A weight measuring device comprising a transport section (10) that intermittently transports the object to be weighed in synchronization with the weighing timing of the weighing section,
A mode switching operation unit (50) for performing an operation mode switching operation to a normal operation mode or a correction value acquisition mode for acquiring a correction value for correcting the measurement data;
A correction value acquisition unit (41) for acquiring the correction value in the correction value acquisition mode,
The correction value acquisition unit
Calculates the average value of the weighing data obtained from the weighing unit as a systematic error in the inspection condition in the operation mode and in a state where the object to be weighed is not conveyed to the weighing unit by the operation of the conveying unit. The weight measurement apparatus is characterized in that the calculated systematic error is stored as a correction value to the weighing data in the operation mode.   The weight measuring apparatus according to claim 1, wherein the weighing unit and the transport unit are provided for a plurality of lines.   The weight measurement apparatus according to claim 1, wherein the correction value acquisition unit performs error notification when the systematic error exceeds a predetermined allowable value.   Switching to the correction value acquisition mode can be switched for each line, and the correction value acquisition unit has a difference between a stored correction value and a newly calculated systematic error exceeding a predetermined allowable value. The weight measuring device according to claim 2, wherein error notification is performed in the case.

Images