JP6716310B2 - Weight measuring device - Google Patents

Description

The present invention relates to a weight measuring device.

As a device for handling capsules as objects to be measured, there is known a capsule weight sorter that intermittently conveys the capsules as objects to be measured one by one to measure the mass of the capsules (see Patent Document 1). .. The capsule weight sorter carries out cleaning around the weighing table by air blow, correction of zero value fluctuation, so-called zero setting, in order to remove powder and the like adhering to the weighing table. In addition, since it has a mechanism to stop the supply of capsules to the weighing platform and has a buffer part that stores capsules, zero set can be performed at any timing of the capsule weight sorter without being affected by the supply speed of the preceding device. Is. Since the capsule weight sorter weighs the weight of the object to be measured together with the weight of the weighing platform, in order to make a selection judgment for only the weight of the object to be weighed, the weight of the weighing platform itself is subtracted from the weighing signal of the weighing instrument. It is necessary to perform correction (zero correction) (see Patent Document 2). At this time, the capsule weight sorter updates the zero correction value by performing zero set.

Japanese Patent Laid-Open No. 2015-152435 Japanese Patent No. 2706837

However, the capsule weight sorter is a device for measuring capsules with high accuracy, and the temperature of the weighing section also changes due to changes in the ambient temperature and an increase in the internal temperature when the power is turned on, adversely affecting the stability of the zero point. May be given. In addition, if the ambient temperature of the device changes significantly, it is possible to respond to the temperature change by frequently performing zero-setting beforehand, but if the frequency of zero-setting is high, the capsule supply to the weighing platform is stopped. Therefore, there is concern that the processing capacity may decrease due to the higher frequency, or the measurement time may be shortened when the processing capacity is maintained and the measurement accuracy may deteriorate.

The present invention has been made in view of the above circumstances, and an object thereof is to monitor a temperature change using a temperature sensor provided in an apparatus, and if the temperature change is large, increase the frequency of zero set to achieve a zero point. The object of the present invention is to provide a weight measuring device capable of stabilizing the temperature and changing the processing capacity at that time.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
A weight measuring device 1 according to claim 1 of the present invention comprises a weighing unit 5 for measuring the mass of an object to be measured 2,
A transport unit 4 that transports the DUTs 2 one by one, and supplies the DUT 2 to and from the weighing unit 5;
A stop unit 18 for stopping the supply of the DUT 2 to the weighing unit 5,
A temperature sensor 30 for detecting the temperature of the measuring unit 5,
When the temperature change obtained by the temperature sensor 30 is outside the predetermined temperature range set based on the required accuracy of the measurement and the balance characteristic, the operation of the stop portion 18 is controlled and the measured object 2 is sent. A control unit 6 for generating a timing not to be generated in the measuring unit 5, measuring the state in which the DUT 2 is not supplied to the measuring unit 5, and executing zero-setting of the measuring unit 5;
Equipped with,
It is characterized in that the control unit 6 changes and controls the transport speed of the transport unit 4 according to the execution frequency of the zero set .

In the weight measuring device 1, when the temperature rises, the supply of the object to be measured 2 is stopped at that stage, and the state in which the object to be measured 2 is not present in the measuring unit 5 is weighed, that is, zero set is executed. When the temperature change is large, zero set is executed every time the temperature is measured, or zero set is executed n times, for example, once within a predetermined time. Zero set is not performed when there is almost no temperature change. The required accuracy is a tolerance of mass when measuring the DUT 2, for example, a range of ±mg or the like with respect to a reference mass value. If the required accuracy has a margin, that is, if the allowable error width is large, the zero set execution frequency is lowered. If the required accuracy is strict, that is, the width of the allowable error is small, and if high accuracy is required, the zero set execution frequency is increased. The weight measuring device 1 has a weighing characteristic peculiar to the weight measuring device. The weighing characteristic is a characteristic such that when the temperature of the weighing unit 5 or the like in the weight measuring apparatus 1 changes from 20° C. to 30° C., the measurement result changes by Mmg, for example, the zero point changes by 5 mg. The control unit 6 determines whether or not zero set can be executed according to the temperature at which the zero point of the weight measuring device 1 changes. As a result, the weighing device automatically changes the zero set cycle in response to changes in ambient temperature and internal temperature. As a result, the weight measuring device 1 can minimize the influence of the temperature change and the influence of the measurement accuracy and suppress the deterioration of the processing capacity to measure the mass.
Further, in the weight measuring device 1, the control unit 6 changes and controls the transport speed of the DUT 2 by the transport unit 4 according to the execution frequency of zero set. That is, the control unit 6 increases the transport speed of the transport unit 4 when the zero-set execution frequency is high. On the other hand, the control unit 6 maintains the transport speed of the transport unit 4 when the zero-set execution frequency is low. As a result, the weight measuring device 1 suppresses a decrease in processing capacity due to an increase in the frequency of execution of zero set.

A weight measuring device 1 according to claim 2 of the present invention is the weight measuring device according to claim 1,
The carrying section 4 is composed of a plurality of carrying lines 13 each equipped with the weighing section 5 and carrying the DUT 2 in parallel,
The temperature sensor 30 is provided in each of the weighing units 5.

In the weight measuring device 1, the temperature sensor 30 is provided in the weighing unit 5 in each of the transfer lines 13 provided in parallel. The control unit 6 executes zero-setting for each of the transport lines 13 according to the measured temperature from each of the temperature sensors 30. The plurality of transfer lines 13 arranged in parallel have different temperature influences between the transfer line 13 located outside and the transfer line 13 located inside. For example, when the influence of the outside air is large and the temperature is high, the temperature rises in the outer transfer line 13 when the temperature is high, and when the internal heat is retained, the temperature is increased in the inner transfer line 13. The weight measuring device 1 suppresses a decrease in processing capacity as compared with a case where all the transfer lines 13 are stopped by executing zero setting for each of the transfer lines 13 according to the measured temperature of each of the transfer lines 13. can do.

According to the weight measuring device of the first aspect of the present invention, the zero change is performed at an optimum frequency to minimize the influence of temperature change, the decrease in measurement accuracy, and the decrease in processing capacity, and the temperature change of the device itself. It is possible to perform stable measurement without being affected by the ambient environment. Further, it is possible to recover the processing capability that decreases due to the increase in the number of times the zero set is executed.

According to the weight measuring device of the second aspect of the present invention, it is possible to perform zero set for each of the transport lines in accordance with the measured temperature of the transport lines composed of a plurality of transport lines. It is not necessary to stop, and it is possible to suppress a decrease in the processing capacity of the entire device.

It is an appearance perspective view of a weight measuring device concerning an embodiment of the present invention. It is a principal part enlarged view of the weight measuring apparatus shown in FIG. It is a side view showing the conveyance part of the weight measuring apparatus shown in FIG. It is a schematic diagram showing the outline of a measuring part. It is a block diagram explaining the structure of the control system of the weight measuring apparatus shown in FIG. It is a flow chart showing the procedure of zero set. It is a graph showing an example of temperature change in a measurement part. It is a structure explanatory view of the modification which represented the variation of arrangement|positioning of a temperature sensor in (a), (b), (c).

Embodiments according to the present invention will be described below with reference to the drawings.
1 is an external perspective view of a weight measuring apparatus according to an embodiment of the present invention, FIG. 2 is an enlarged view of a main part of the weight measuring apparatus shown in FIG. 1, and FIG. 3 shows a carrying section of the weight measuring apparatus shown in FIG. It is the side view represented.
The weight measuring device 1 according to the present embodiment inspects the weight of an object to be measured, that is, weighs it. In the present embodiment, the object to be measured is a long cylindrical capsule 2 (see FIG. 3) having hemispherical ends. As a raw material of the capsule 2, gelatin, hydroxypropylmethyl cellulose, or the like can be used. In addition, the object to be measured, which is an object to be inspected by the weight measuring device 1, may be a tablet, a stick sachet (stick type package) in which granules, sugar and the like are enclosed.

The configuration of the weight measuring device 1 is roughly divided into an outer housing 3, a transport unit 4, a weighing unit 5, and a control unit 6 (see FIG. 5). The outer casing 3 has a door body 7 which is partially translucent and which can be opened and closed. A supply hole 8 that communicates with the transport unit 4 is provided on the upper surface of the outer housing 3, and by attaching a hopper 9 to the upper surface of the outer housing 3 and communicating with the supply hole 8, It is possible to supply the capsule 2 to the transport unit 4 inside. The weight measuring device 1 has a mechanism for stopping the supply of the capsule 2 to the weighing unit 5 by a shutter described later, that is, a buffer unit capable of holding the capsule 2. Since the weight measuring device 1 has the buffer part for accumulating the capsule 2, the zero set described later can be executed at an arbitrary timing without being affected by the supply speed of the preceding device.

In the present embodiment, the transport unit 4 includes three transport units 4 having the same configuration arranged in parallel. Each transport unit 4 includes a supply unit 10, an intermittent transport unit 11, and a distribution unit 12. Further, in the transport section 4, a supply section 10 and an intermittent transport section 11 are arranged in parallel as a plurality of, for example, 10 rows of transport lines 13. A weighing unit 14 (see FIG. 4) of the weighing unit 5 is arranged on each of the transport lines 13. The weighing unit 14 is surrounded by one weighing unit case 15 that traverses each of the transport lines 13. That is, in the present embodiment, ten parallel weighing units 14 are arranged in the weighing unit case 15 to form one set, and by further forming three of these set configurations in parallel, the transport line 13 has 30 rows. Become.

The supply unit 10 intermittently sends out one by one the capsules 2 input from the hopper 9 arranged above. The supply unit 10 has a magazine 17 and a shutter 18 as a stop unit. The magazine 17 is communicated with the bottom of the hopper 9, a supply path for dropping the capsule 2 is formed, and is periodically moved up and down. The capsules 2 are housed in a line in the vertical direction in the supply path inside the magazine 17 in the vertical direction with the axis line directed in the vertical direction. The shutter 18 normally closes the supply path when the magazine 17 moves out of the lower end position in the vertical movement, and stops the fall of the capsule 2 from the lower end of the supply path. That is, by opening and closing the shutter 18, the supply of the capsule 2 from the magazine 17 to the weighing unit 5 and the stop of the supply can be performed.

A curved concave portion 19 is provided in the supply unit 10 immediately below the magazine 17. When the capsule 2 dropped from the magazine 17 lands on the curved concave portion 19, the capsule 2 is held in a tilted posture with its axis directed obliquely upward in the transport direction, as shown in FIG. The supply unit 10 is provided with a pusher 20 that is advanced in the transport direction on the upstream side (the right side in FIG. 3) of the curved recess 19 in the transport direction. The pusher 20 horizontally slides from the rear (right side in the figure) of the curved recess 19 to send the capsule 2 located in the curved recess 19 to the next step.

The measuring unit 5 measures the mass of the capsule 2. The weighing unit 5 is provided in the next process of the supply unit 10, and the capsules 2 sent by the pusher 20 from the supply unit 10 are placed one by one, and the weight of each capsule 2 is measured. The weighing unit 14 of the weighing unit 5 includes a measuring device 16 having a weighing platform 21. The weighing platform 21 is supported by the measuring device 16 by a Roberval mechanism. The Roberval mechanism has a parallelogram frame in which each side can move freely. The weighing platform 21 is attached to one of the columns of this frame, and the other column serves as a fixed sensor. As a result, an accurate weight can be measured regardless of the position of the capsule 2 on which the capsule 2 is placed. The measuring device 16 has, for example, a load cell (not shown) as a weighing sensor. By placing the capsule 2 on the weighing platform 21, the weight of the capsule 2 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 various other weighing sensors can be used.

The intermittent transport unit 11 intermittently transports the capsule 2 in synchronization with the supply unit 10 and the weighing unit 5. The intermittent transport unit 11 includes a transport body 22, a staircase-shaped transport mechanism 23, and a step jump control roof portion 24.

The carrier 22 is formed in a structure having a downward space, such as an E shape. The carrier 22 has a front claw portion, a middle claw portion, and a rear claw portion, and can prevent the capsule 2 from escaping and popping out. The carrier 22 holds the capsule 2 of the weighing table 21 so as to cover it from above, and sends it to the staircase-shaped carrier mechanism 23 at the next stage. The carrier 22 intermittently carries the capsule 2 in synchronization with the movement of the supply unit 10. That is, the stopped time substantially coincides with the weighing timing of the weighing unit 5.

The stepwise transport mechanism 23 gradually lowers along the transport direction of the capsule 2. In this configuration, the staircase-shaped transport mechanism 23 places the capsule 2 in a stationary state at substantially the same timing as the weighing timing of the weighing unit 5. The stepwise transport mechanism 23 has a mounting table 25. In this configuration, there are five mounting tables 25. The weight measuring device 1 according to the present invention may have a configuration including at least one mounting table 25.

The staircase-shaped transport mechanism 23 includes a fixed step body 26 and a stepped pusher 27. In the fixed step body 26, the mounting table 25 is formed in a step shape. The stepped pusher 27 is sandwiched at the center of the fixed stepped body 26 so as to be horizontally slidable along the transport direction. The carrying path including the fixed step body 26 and the stepped pusher 27 forms a stepped V groove by the mounting table 25. Each capsule is mounted so that each capsule 2 is held. The stepped pusher 27 is slid to repeat the operations of “pushing”, “dropping”, and “returning” the capsule 2.

The intermittent transport unit 11 is provided with a step jump control roof portion 24 above the stepwise transport mechanism 23. The step jump control roof portion 24 is arranged so as to face the staircase-shaped transport mechanism 23 so as to be separated therefrom, and the opposite lower surface is formed following the staircase shape. The opposite lower surface has an inverted step portion that faces each mounting table 25. The reverse step portion, together with the mounting table 25, forms an enclosed space that prevents the capsule 2 from falling onto the mounting table 25 in the lower step. As a result, the opposite lower surface of the jump control roof portion 24 prevents jumping to the mounting table 25 ahead of the mounting table 25 to which the capsule 2 is transported.

The distribution unit 12 is provided in the intermittent transfer unit 11 or the subsequent process. In this embodiment, the sorting unit 12 is provided at the rearmost part of the intermittent transport unit 11. When the capsule 2 is transported from the intermittent transport unit 11, the distribution unit 12 switches the transport destination of the capsule 2 based on at least the measurement result from the weighing unit 5. The distribution unit 12 includes a drop port 28 and a drop port opening/closing lid 29. The dropping port 28 is opened in the mounting table 25 at the rearmost portion, and the capsule 2 is dropped to the lower destination. The drop port opening/closing lid 29 closes the drop port 28 and switches the transport destination of the capsule 2. As the drop opening/closing lid 29, for example, one end thereof rotates about a rotation axis to linearly reciprocate along the rotary lid mechanism or the drop opening 28 that opens/closes the drop opening 28. It consists of a slide lid mechanism.

The weight measuring device 1 is configured such that the supply unit 10, the intermittent transfer unit 11, and the distribution unit 12 that are the movable parts described above are operated by a link mechanism L driven by one motor M and the like. The link mechanism L enables intermittent conveyance at a predetermined time interval (timing) by controlling the rotational movement of the motor at a substantially constant rotational speed by converting the rotational movement into reciprocating movement and swinging movement. In the weight measuring device 1, the weighing operation of the weighing unit 5 is controlled in synchronization with the timing of the intermittent transfer.

The control unit 6 controls the feeding speed of the supply unit 10, the transfer operation of the intermittent transfer unit 11, and the switching operation of the sorting unit 12 by controlling the rotation speed of the motor. Further, the control unit 6 controls the measuring operation of the weighing unit 5 in synchronization with these intermittent transport operations. More specifically, the control unit 6 can be a computer including a central processing unit (CPU), an internal memory, an external memory, an interface, and the like. Input means (keyboard, etc.) and display means can be connected to this computer. As a result, the control unit 6 can input the measurement operation, the setting of the intermittent transport speed and the like, and display the measurement result and the distribution result. Further, the control unit 6 may control only the operation timing by using a programmable sequencer or the like.

FIG. 4 is a schematic diagram showing an outline of the weighing unit 5 shown in FIG.
Each of the weighing units 14 of the weighing unit 5 is provided with a temperature sensor 30. In the present embodiment, each of the transport units 4 is composed of a plurality of the capsules 2 that transport the capsules 2 in parallel, and in this embodiment, 10 rows of the transport lines 13. The weighing unit 14 is arranged corresponding to each intermittent transport unit 11. One temperature sensor 30 is provided for each of the weighing units 14 arranged in parallel. The temperature sensor 30 detects the temperature of each weighing unit 14. The temperature sensor 30 is connected to the control unit 6. The temperature value detected by each weighing unit 14 is input to the control unit 6. The temperature sensor 30 is used as a thermometer for temperature compensation in the measuring unit 5.

FIG. 5 is a block diagram for explaining the configuration of the control system of the weight measuring device shown in FIG.
The weight measuring device 1 includes a control unit 6 including a pass/fail judgment unit 31, a zero set control unit 32, and a temperature change storage unit 33 as a control system configuration.

The quality determination unit 31 determines the quality of the capsule 2 based on the weighing result of the weighing unit 5. The pass/fail judgment unit 31 sends a distribution control signal to the distribution unit 12 according to the judgment result.

The zero set control unit 32 executes zero set according to the temperature change of the temperature sensor 30 and determines the frequency of the zero set. The frequency of performing the zero set, that is, the execution frequency is, for example, how many times the zero set is performed within a predetermined time. The execution frequency is determined according to the temperature change. The temperature change storage unit 33 has a data table that stores the execution frequency corresponding to the temperature change for that purpose.

The zero-set control unit 32 in the control unit 6 controls the operation of the shutter 18 of the supply unit 10 based on the three conditions of the temperature change obtained by the temperature sensor 30, the required accuracy of measurement, and the balance characteristic. The control unit 6 causes the weighing unit 5 to generate a timing at which the capsule 2 is not transported by controlling the operation of the shutter 18. At the same time, the control unit 6 performs zero weighing of the weighing unit 5, that is, a state in which the capsule 2 is not supplied to the weighing unit 5, that is, 0 mg is weighed, thereby resetting the weighing unit 5 to zero mg. That is, correction is performed, and this is set as execution of zero set. It should be noted that the timing at which the capsules 2 are not transported is only one in the cycle in which the capsules 2 are intermittently transported one by one. In addition, in order to stabilize the measurement of zero mg, the supply of the capsule 2 for a plurality of times (minutes) may be stopped and the average of the measured values for a plurality of times may be set to zero.

The temperature change is obtained by monitoring the temperature sensor 30, and a temperature difference from a certain time point (for example, a time point when zero set is executed) or a temperature change rate which is a temperature change for a predetermined time can be used. The temperature change rate is set by a temperature fluctuation value (° C.) by the temperature sensor 30 in a unit time, for example, a time (min) such as 5 minutes.

The required accuracy is a permissible range of the mass error when measuring the capsule 2, for example, a permissible range of the mass error required by the user such as ±mg with respect to the mass value of the standard capsule 2.

The weighing characteristic is a characteristic such that the zero point of Mmg (for example, 5 mg) changes by ±dmg as a weighing result when the temperature changes in the weight measuring device. The balance characteristic is stored as a learning value in the temperature change storage unit 33, which data indicates how much the temperature should be changed to perform the zero set. In other words, it has a value of how much temperature changes and how much it changes. For example, when the temperature changes from 20° C. to 30° C., the information that the zero point changes by 5 mg is stored in the temperature change storage unit 33.

The weight measuring device 1 executes zero-setting based on the accuracy required by the user, changes in the temperature of the device itself and the surroundings of the device, and the balance characteristics. The zero set may be executed when the temperature difference based on the required accuracy and balance characteristics is exceeded, or it may be monitored using the temperature change and the temperature change rate, and performed at a zero set cycle corresponding to the temperature change rate. You may Further, the execution frequency of zero set in this case is calculated in correspondence with the temperature change rate. The zero set cycle corresponding to the temperature change rate is determined so that the zero set cycle becomes short when the temperature change rate is high and becomes long when the temperature change rate is low. The execution frequency is calculated.

Further, in the present embodiment, the control unit 6 changes and controls the transport speed of the transport unit 4 according to the execution frequency of zero set. The control unit 6 increases the transport speed of the transport unit 4 when the frequency of zero set is high. On the other hand, the control unit 6 maintains the transport speed of the transport unit 4 when the zero-set execution frequency is low. The weight measuring device 1 stops the supply of the capsule 2 to the measuring unit 5 when the zero setting is performed, so that the supply is delayed and the capsule 2 is not measured. That is, the processing capability of the device is reduced. The weight measuring device 1 increases the processing speed to increase the processing speed to compensate for the decrease in the processing capacity. Increases processing capacity by performing zero set frequently. As a result, the weight measuring device 1 can recover the processing capacity by increasing the conveying speed as much as the processing capacity decreases. The change of the transport speed is performed by each intermittent transport unit 11. Since the weight measuring device 1 is provided with the plurality of transfer lines 13, it is sufficient that the predetermined target number to be processed is reached on the whole of the plurality of lines.

Next, a procedure of zero setting by the weight measuring device 1 will be described.
FIG. 6 is a flowchart showing the procedure of zero set.
When the operation is started (st1), the control unit 6 of the weight measuring device 1 determines whether the temperature change is within a predetermined range (st2). When the temperature change is within the predetermined range, the process returns to the original processing position before the temperature change determination. It should be noted that the predetermined range used for the determination is a range of temperature change (for example, a temperature difference, which is an error range having a margin to satisfy the required accuracy in which the weighing error with respect to the temperature change obtained from the weighing characteristic does not deviate from the required accuracy). ) Is set.

When the temperature change is out of the predetermined range, the control unit 6 executes the zero set (st3), that is, controls the operation of the shutter 18 to generate the timing at which the capsule 2 is not conveyed and performs the weighing. Zero correction of the part 5 is performed.

Next, the control unit 6 determines whether the processing capacity is within a predetermined range (st4). If the processing capacity is within the predetermined range, it is determined whether or not the operation has ended (st6). If not, the process returns to the original processing position before the temperature change determination. When the processing capacity is out of the predetermined range, the control unit 6 sends a transportation speed change signal to the transportation unit 4 (st5). After that, if the operation is not completed, the process returns to the original processing position before the temperature change determination.

FIG. 7 is a graph showing an example of temperature change in the measuring unit 5.
In FIG. 7, the white circle S is plotted as the zero set timing. Moreover, the solid line represents the temperature change of the measuring unit 5. The dashed line represents an example of a further temperature change. When only the temperature change rate is viewed, the zero set execution frequency is zero when the power is turned on, because the temperature change rate is large, that is, the temperature rises rapidly with the passage of time. The set is executed more frequently. When a predetermined time has passed since the power was turned on and the rate of temperature change becomes small, the zero-set execution frequency is low, that is, the temperature rises slowly with the elapse of time, so the zero-set execution interval becomes wider. .. In addition, if the temperature change rate is large in the middle and, for example, the outside air temperature rises or some kind of temperature rise occurs, the zero-set execution frequency increases again.

Next, the operation of the above configuration will be described.
When the temperature rises, the weight measuring device 1 according to the present embodiment executes zero set at that stage. When the temperature change is large, for example, the temperature is measured every 5 minutes, and when the temperature change occurs every 5 minutes, such as a rise of about 0.2° C., a zero set is executed to measure the temperature. Zero-setting is performed, or zero-set is performed n times (for example, once) within a predetermined time. Zero set is not performed when there is almost no temperature change.
The required accuracy is a permissible error of mass when measuring the capsule 2, for example, a permissible range required by the user such as ±mg with respect to the mass value of the capsule 2 serving as a reference. If the required accuracy has a margin, that is, if the allowable error is large, the zero set execution frequency is lowered. If the required accuracy is strict, that is, if the tolerance is small and the accuracy is high, the zero set execution frequency is increased.
The weight measuring device 1 has a weighing characteristic peculiar to the weight measuring device. The weighing characteristic is a characteristic of the weight measuring device 1 such that when the temperature changes from 20° C. to 30° C., the zero point changes by 5 mg.
The control unit 6 determines whether or not zero set can be executed according to the temperature at which the zero point of the weight measuring device 1 changes. As a result, the weight measuring device 1 automatically changes the zero-set cycle in accordance with changes in ambient temperature, internal temperature, and ambient temperature. As a result, the weight measuring device 1 can measure the mass while minimizing the deterioration of the processing capacity, the influence of the temperature change, and the influence of the measurement accuracy.

Further, in the weight measuring device 1, the temperature sensor 30 is provided in the weighing section 5 in each of the transfer lines 13 provided in parallel. The control unit 6 executes zero set for each of the transport lines according to the measured temperature from each of the temperature sensors 30. The plurality of transfer lines 13 installed in parallel have different temperature influences between the transfer line 13 located outside and the transfer line 13 arranged inside the apparatus. For example, when the influence of the outside air is large and the temperature is high, the temperature rises in the outer transfer line 13, and when heat is generated inside the apparatus, the temperature is increased in the inner transfer line 13. The weight measuring device 1 suppresses a decrease in processing capacity as compared with the case where all the transfer lines 13 are stopped by executing zero-setting for each transfer line according to the measured temperature of each transfer line 13. be able to. As a result, it is possible to individually control the weighing units 5 composed of a plurality of units, so that it is not necessary to stop the entire apparatus, and it is possible to suppress a decrease in the processing capacity of the entire apparatus.

Further, in the weight measuring device 1, the control unit 6 changes and controls the transport speed of the transport unit 4 according to the execution frequency of zero set. That is, the control unit 6 increases the transport speed of the transport unit 4 when the zero-set execution frequency is high. On the other hand, the control unit 6 maintains the transport speed of the transport unit 4 when the zero-set execution frequency is low. As a result, the weight measuring device 1 suppresses a decrease in processing capacity due to an increase in the frequency of execution of zero-set, and thus can recover to the processing target value in the weight measuring device 1, for example. As a result, it is possible to recover the processing capability that drops due to the increase in the number of zero-sets.

FIG. 8 is a configuration explanatory view of a modified example in which variations of the arrangement of the temperature sensor 30 are shown in (a), (b), and (c).
Note that, in the above-described embodiment, an example in which the temperature sensor 30 is provided in the weighing unit 14 of each transport line 13 has been described, but the weight measuring device according to the present invention, as shown in FIG. Two temperature sensors 30 may be provided inside the weighing unit case 15 of No. 5 along the juxtaposed direction of the weighing units 14. That is, the weighing unit 14 may not be directly measured, but may be configured by a sensor such as a non-contact sensor that can monitor temperature distribution. Further, as shown in FIG. 8B, three temperature sensors 30 may be provided in the weighing unit case 15 at equal intervals along the parallel direction of the weighing units 14. Further, one temperature sensor 30 may be provided in each weighing unit case 15.

In the above embodiment, the case where the DUT is a capsule has been described as an example, but the DUT is a stick packaging (stick-type packaging body) in which granules, sugar, jelly, etc. are enclosed. ). In this case, in the weight measuring device, the intermittent conveying unit is composed of a belt conveyor on which stick packaging can be placed.

The present invention is not limited to the above-described embodiment. For example, in the above configuration example, the case where the transport unit 4 includes the plurality of transport lines 13 has been described. It can be one transport section 4. Although the temperature sensor 30 has been described as being provided in the weighing unit 14, the configuration of the present invention is not necessarily provided for each weighing unit 14 as long as the temperature sensor 30 can measure the temperature of the weighing unit 14. Good.

Therefore, according to the weight measuring device 1 according to the present embodiment, by performing zero-setting at an optimum frequency, the influence of temperature change, the decrease in processing capacity, and the decrease in measurement accuracy are minimized, and the influence is exerted on the surrounding environment. Therefore, stable measurement can be performed. In addition, the processing capacity can be changed according to the execution frequency of zero set.

1... Weight measuring device 2... Object to be measured (capsule)
4...conveying unit 5...weighing unit 6...control unit 13...conveying line 18...stop unit (shutter)
30... Temperature sensor

Claims (2)

A weighing unit (5) for measuring the mass of the object to be measured (2),
A carrying section (4) for carrying the objects to be measured one by one, and for supplying and unloading the measuring section;
A stop part (18) for stopping the supply of the object to be measured to the measuring part,
A temperature sensor (30) for detecting the temperature of the measuring unit,
When the temperature change obtained by the temperature sensor is out of a predetermined temperature range set based on the required accuracy of the measurement and the balance characteristic, the stop unit is operated and controlled, and the measured object is not sent. A control unit (6) for causing the measuring unit to measure, measuring the state in which the object to be measured is not supplied to the measuring unit, and performing zero-setting of the measuring unit;
Equipped with,
The weight measuring device , wherein the control unit changes and controls the transport speed of the transport unit according to the execution frequency of the zero set . The weight measuring device according to claim 1,
The transport section comprises a plurality of transport lines (13) each having the weighing section and transporting the object to be measured in parallel,
The weight measuring device, wherein the temperature sensor is provided in each of the weighing units.

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