JP2004156905A - Automatic examination device for measuring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic examination device for automatically adding and removing proper balance weights corresponding to a model, and automatically controlling temperature of an examination room without requiring manual operation, in a measuring apparatus. <P>SOLUTION: This automatic examination device comprises a group of weights B connected in a column, a weight raising and lowering means G for lowering, stopping and raising the group of weights, a model determining means 22 for specifying the model of the measuring apparatus 18 to be measured, a weight selecting means 23 for selecting the weight to be loaded on the basis of the model specified by the model determining means, a weight control means 24 for controlling the weight raising and lowering means to load the weight selected by the weight selecting means on the measuring apparatus, a storing means 25 for storing a measured weight when the selected weight is loaded on the measuring apparatus, and a pass or fall determining means 27 for determining whether the measuring apparatus is a good item or not on the basis of a measured value stored in the storing means. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an automatic measuring device used for temperature characteristic inspection of a measuring device such as an electronic balance, a counting device, and a weighing device, which is a digital measuring device, or a pass / fail judgment in a manufacturing process.
[0002]
[Prior art]
Recent digital scales have high precision and high resolution, and thus have a problem of the influence of temperature.
[0003]
For example, even a general-purpose electronic balance has a resolution of about 1 / 500,000 to 1 / 1,000,000, and a balance with a weighing value of 1 kg can measure up to a change of 1 mg. The performance of such a high-resolution balance must be guaranteed even when the environment is used at a temperature of 25 ° C. ± 10 ° C. Therefore, whether the performance is satisfied or not is inspected by changing the temperature in the room.
[0004]
Conventionally, a plurality of measuring instruments are installed in a temperature-controlled room, for example, when the room temperature is set to 40 ° C., and when the measuring instruments are sufficiently adjusted to the room temperature (4 to 8 hours), the worker sets the temperature. After entering the room, a reference weight (hereinafter simply referred to as a “weight”) adjusted to the measuring instrument was manually added and removed, and the temperature characteristic of the measuring instrument was measured.
[0005]
At this time, if the air from the temperature controller (air conditioner) hits the meter, the weighing value will become unstable and correct measurement cannot be performed. Therefore, stop the temperature controller and perform the weighing quickly before the room temperature rises. Must.
[0006]
The room temperature is then set at 0 ° C. and 20 ° C., and the meter is weighed again when the meter is fully adapted to that temperature.
[0007]
Thus, temperature setting and measurement are performed manually.
[0008]
[Problems to be solved by the invention]
By the way, in the inspection of the above-mentioned measuring instrument, it takes about 4 to 8 hours for the measuring instrument to adjust to room temperature, and when measuring the measuring instrument by changing the room temperature from normal temperature to high temperature, low temperature, and normal temperature, it takes 12 hours. It takes about 24 hours.
[0009]
If this is done manually, the operator must be on standby until the scale is adjusted to room temperature. Also, even if the temperature is kept constant, the room temperature changes due to the worker entering the room for measurement, stopping the temperature controller and performing the work, and the measured value is slightly An error is caused.
[0010]
As described above, there is a problem that the inspection of the measuring instrument manually is not preferable for the precise measuring instrument.
[0011]
The present invention has been made to solve the above-described problem, and a first problem is that a weighing device capable of automatically adding and removing an appropriate weight according to a model to a weighing device without manual operation and performing an inspection. The second problem is to provide an automatic inspection device for measuring instruments that can automatically inspect a plurality of measuring devices without manual intervention. The problem is to set the multiple temperatures from low to high in a time series according to the program together with the first or second problem, control the temperature of the room where the measuring instrument is installed according to the setting, It is an object of the present invention to provide an automatic inspection device that can perform adjustment and weighing without human intervention.
[0012]
[Means for Solving the Problems]
In order to solve the first problem, in the automatic inspection apparatus according to the first aspect of the present invention, a weight group having weights connected in tandem, weight lifting / lowering means for lowering, stopping, and raising the weight group, and a weighing device for measuring Model determination means for specifying the model of the device, weight selection means for selecting a weight to be mounted according to the model, and weight control for controlling the weight lifting / lowering means so that the weight selected by the weight selection means is mounted on the measuring instrument. Means, storage means for storing a weighing value when the selected weight is mounted on the weighing device, and pass / fail determination means for performing pass / fail determination of the weighing device from the weighing value stored in the storage means, comprising: It is characterized by eliminating the need for human work after setting.
(Operation) This automatic inspection device can be used to determine the model of a measuring instrument that has been confirmed by humans, load a predetermined weight, check the weight value when a predetermined weight is loaded, and check whether the measuring instrument is good or defective. There are various means for automatically determining whether or not there is, and all of them are automatically performed.
[0013]
In order to solve the second problem, in the automatic inspection device according to the second aspect of the present invention, an automatic inspection device for a measuring device according to the first aspect, a horizontal table on which a plurality of measuring devices are mounted, and a weight group And a horizontal movement control means for controlling the horizontal movement means, so that a plurality of weighing machines can be automatically inspected.
(Operation) When the inspection of one measuring instrument is completed, the weight group is moved onto the next measuring instrument by the horizontal moving means controlled by the horizontal moving control means, and the plurality of measuring instruments are connected. Inspection automatically and sequentially.
[0014]
In order to solve the third problem, in the automatic inspection device according to the invention according to claim 3, the automatic inspection device according to claim 1 or 2, and a room that shuts off the automatic inspection device from the outside air, A temperature controller for adjusting the temperature of the room, and a temperature controller for setting the temperature of the room from a low temperature to a high temperature in chronological order, and controlling the temperature controller according to the setting; It is characterized in that a change in a weighed value due to a change in temperature is automatically measured.
(Operation) This automatic inspection device performs an inspection of a measuring instrument in a room whose room temperature is adjusted by a temperature controller controlled by a temperature control means, and automatically operates the measuring instrument without being adversely affected by temperature or wind. Inspection
[0015]
Embodiment of the Invention
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a main part of the automatic inspection device, FIG. 2 is a diagram showing details of a mechanical configuration shown in FIG. 1, and FIG. 3 shows an operation of the automatic inspection device. It is a flowchart.
[0016]
The automatic inspection apparatus includes a mechanical structure 15 including a horizontal table 16, a horizontal moving means F for a weight group B, a weight lifting / lowering means G, and the like, and a personal computer (CPU) 20 for controlling these and providing a pass / fail judgment of the measuring instrument 18. After the weighing device 18 is placed on the horizontal table 16, the weighing operation is performed automatically.
[0017]
First, the mechanical configuration 15 will be described with reference to FIGS.
[0018]
The horizontal base 16 is supported by the left and right columns 56, 56, and is placed in a horizontal line regardless of the type of the weighing device 18 and its size. Marks (not shown) indicating the placement position are provided at regular intervals on the horizontal table 16, and when the measuring device 18 is placed on this mark, it is appropriately detected by a sensor (not shown) and a lamp (not shown) is displayed. No) lights up. The operator only needs to place the measuring device 18, and other operations are unnecessary. In FIG. 2, six weighing devices 18 are placed on the horizontal table 16, which is based on consideration of the nighttime unemployment time and the time required for the inspection by the automatic inspection device.
[0019]
The weight group B is formed by connecting a plurality of reference weights (hereinafter, simply referred to as weights) 30 that match the inspection weight. For example, the inspection weight is 10 kg, 20 kg, and 40 kg with respect to the weighing device 18 weighing 40 kg. Is determined, the weights 30 of 10 kg, 10 kg, and 20 kg are connected from below. The weight group B is configured such that only the weights 30 selected from the three weights 30 are sequentially mounted on the scale 18 by lowering, stopping, and raising the support member 34 by the operation of the weight lifting / lowering means G described later. Is done.
[0020]
As shown in FIG. 2, the connecting means of the weights 30 includes a “reverse trapezoidal” recess 31 provided on the lower surface of each weight 30 and a projection 32 fixed on the upper surface thereof. It is locked inside.
[0021]
The horizontal moving means F is for moving the weight group B to a position above the weighing device 18 and stopped by a command from a horizontal moving control means 26 described later. A horizontal moving means F shown in FIG. 2 includes a guide 58 that is in close contact with and leads to the slider 62, a drive shaft 64 whose outer periphery is screwed into a part of the slider 62, and moves the slider 62 by rotation, The weight group B moves in the left-right direction by the rotation of the motor 66, and stops moving when the rotation of the motor 66 is stopped. The rotation and stop of the motor 66 are measured by various means such as the mounting position of the measuring device 18 stored in the storage means 25 and the position confirmation means of the weight group B, for example, a position sensor or a set position inputted to the personal computer 20. It is controlled by detecting the position of the vessel 18. With the movement of the slider 62, the weight group B is automatically moved from the leftmost start position to the leftmost measuring device 18, then to the right next measuring device 18, and finally to the start position after the inspection of the rightmost measuring device 18. Will move.
[0022]
The weight lifting / lowering means G lowers, stops, and raises the weight group B in accordance with a command from the weight control means 24 described later, and mounts the weight 30 on the weighing device 18 according to the inspection weight. The weight lifting / lowering means G shown in FIG. 2 includes a lifting / lowering drive shaft 36 fixed to a support member 34, a lifting / lowering motor 40 for raising / lowering the driving shaft 36, and transmitting rotation of the lifting / lowering motor 40 to the drive shaft 36. And a converter 38 that performs the conversion. The weight group B supported by the slider 60 is moved up and down by driving the elevating motor 40.
[0023]
This mechanical configuration 15 is formed of a heat insulating wall, and is installed in a room 14 whose temperature is controlled by an air conditioner (temperature controller) 60. The setting of the temperature in the room 14 is performed by a personal computer 20 installed outside the room 14.
[0024]
Next, various commands and operations of the personal computer 20 will be described.
[0025]
The input / output means 21 shown in FIG. 1 receives various signals b from the weighing device 18 and transfers them to a necessary department. In the order of operations, a signal c for specifying a model is determined by a model determination. The weighing signal g with the weight 30 mounted on the means 22 is output to the weight control means 24. The input / output unit 21 also transfers a model inquiry signal a from the model determination unit 22 described later to the measuring device 18.
[0026]
The model determination means 22 automatically determines the model of the measuring device 18 to be inspected, and outputs the determination result e to the weight selecting device 23. The identification device (not shown) provided in the measuring device 18 Is input to the input / output means 21, and the identification signal c transferred from the input / output means 21 is compared with the model determination data d from the storage means 25 storing the model of the measuring instrument 18 to be inspected. , Specify the model. The identification means outputs a pulse signal that can be distinguished from other models, and the storage means 25 stores all the models to be inspected and allowable values for pass / fail determination.
[0027]
The weight selecting means 23 is for selecting the set inspection weight from the storage means 25, and is based on the identification signal e from the model determining means 22 and the weight selection data f stored in the storage means 25. The inspection weight, that is, the weight 30 to be mounted is determined. For example, in a model in which the inspection weight is set in the order of 20 kg, 10 kg, and 40 kg, the first inspection weight is determined to be 20 kg, and weights 30 of 10 kg, 10 kg, and 20 kg are connected from below to obtain this inspection weight. In weight group B, the two lower 10 kg weights must be selected. When the weight to be mounted on the scale 18 is thus selected, the weight selection data f includes the height of the weight group B (support member 34) for mounting the weight 30 selected according to the model on the scale 18. Since data on h is also included, the height h of the weight group B is determined based on the identification signal e and the weight selection data f, and the height h is sent to the control means 24.
[0028]
The weight control means 24 drives the weight lifting / lowering means G while comparing the signal from the weight group position detecting sensor (not shown) with the height h sent from the weight selection means 23, and the weight group B is instructed. To the height h. Then, the weight value i when the selected weight 30 is mounted on the weighing device 18 is transferred to the storage means 25. In the control after the end of the measurement, the weight group B is raised and stopped at the original position.
[0029]
The horizontal movement control means 26 sends a command signal for moving the slider 62 to the motor 66 so that the weight group B is positioned on the measuring device 18. In this embodiment, since a stepping motor is used as the motor 66, it is only necessary to send a drive pulse corresponding to the mounting position of the measuring device 18 to the motor 66.
[0030]
The temperature control means 28 operates the mechanical structure 15 in the room 14 at a predetermined temperature as shown in FIG. 2 so that the room temperature is set to 0 ° C., 20 ° C., 40 ° C. The air conditioner 60 is operated in order to control the temperature in degrees Celsius in time series. Since weighing under constant temperature and no wind is indispensable for the precise weighing device 18 affected by temperature change, the air conditioner 60 must be stopped at the time of weighing, and a quick and accurate inspection must be performed.
[0031]
The storage unit 25 stores the model determination data d, the weight selection data f according to the model, the weighing value i for pass / fail determination, the set value of the room temperature j in the room 14, the mounting position of the weighing device 18, and the like. In addition, it also stores various programs necessary for automatic inspection, judgment methods and display methods.
[0032]
The pass / fail determination means 27 is operated by a key operation of the personal computer 20, and performs a pass / fail determination weighing value i and a corresponding allowable value on the display device 42 or a pass / fail determination of the weighing device 18, and displays a result of the determination. It is. With this pass / fail determination means, there is an advantage that accurate determination can be made without relying on the memory of the operator as in the conventional case. Further, if this determination result is statistically processed, there is an advantage useful for quality control.
[0033]
Next, the action of the worker performed before the automatic inspection will be described. Items to be confirmed include that the model of the measuring device 18 is registered in the storage means 25, that the measuring device 18 is at a predetermined position and that the OK lamp is lit, and that the code 19 of the measuring device 18 is connected to the personal computer 20. And so on. In setting the personal computer 20, the room temperature in the room 14, the start time, the method of weighing and the like are selected, and the weight group B needs to be connected to a plurality of weights 30 corresponding to the inspection weight. is there.
[0034]
Next, the operation of the automatic inspection apparatus performed unattended will be described with reference to the flowchart shown in FIG.
[0035]
When the program of the personal computer 20 is started, the model determining means C2 operates to send a model inquiry signal a to the measuring device 18 (step S1), and the measuring device 18 returns an identification signal b. The model determination means C2 selects and specifies the corresponding model from the storage means 25 based on the identification signal b (step S2). If the model identification signal b is not returned or there is no corresponding model in the storage means 25, the model cannot be determined, and the fact is stored in the storage means 25, and a decision is made to inspect the next measuring instrument 18. (Step S20).
[0036]
When all the models of the weighing devices 18 are specified, the temperature control unit 28 selects the set temperature of 40 ° C. from the storage unit 25, and the air conditioner (temperature controller) until the room temperature of the room 14 becomes constant at 40 ° C. ) 60, and after keeping the room temperature constant for a set time (4-8 hours), the air conditioner 60 is stopped at the time of starting weighing (step S3).
The purpose of stopping the air conditioner 60 is to prevent air from flowing out of the air conditioner 60 and to stably perform measurement.
[0037]
At the start of weighing, the weight group B moves rightward from the start position together with the slider 62 in response to a command from the horizontal movement control means 26 to the motor 66, and stops on the nearest weighing machine 18. In this movement control, the motor 66 is driven until the distance from the mounting position of the weighing device 18 stored in the storage means 25 becomes zero (step S4).
[0038]
The weight selection of the weighing device 18 is selected by the weight selection unit 23 by comparing the weight selection data f for each model stored in the storage unit 25 with the model e specified by the model determination unit 22 (step S5). ). For example, if 20 kg, 10 kg, and 40 kg are stored in the storage unit 25 as the inspection weight, 20 kg is selected as the first inspection weight. In order to obtain this test weight, only the lower two 10 kg weights 30 are mounted on the scale 18. For this, the height of the weight group B is detected by a weight group position sensor (not shown) or the like, the drive of the lifting / lowering motor 40 is controlled by the weight control means 24, and the weight group B is designated by the weight selection data f. The height is set, and the lifting motor 40 is stopped (step S6). Thus, only the selected weight 30 is mounted.
[0039]
When the loading of the selected weight 30 is completed, the weight value i from the measuring device 18 at this time and the room temperature of the room 14 and the like are stored in the storage means 25. Thereafter, the weight 30 is raised and the weight is 30 is removed and the first weighing is completed (step S7).
[0040]
Next, an inspection with an inspection weight of 10 kg is performed at the same room temperature. This is the same as steps S6 and S7 except that the excess weight 10kg is removed for the inspection weight 20kg. Next, an inspection with an inspection weight of 40 kg is executed. This is the same as steps S6 and S7 except that the missing weight 30 of 30 kg is added to the inspection weight of 10 kg (step S8).
[0041]
Next, the weight group B is moved onto the next measuring device 18, and the measuring device 18 is inspected in the same manner as in steps S5 to S8. Then, the weight group B is sequentially moved onto the next measuring device 18, and all the measuring devices 18 on the horizontal table 16 are inspected. Thereafter, the weight group B returns to the start position (step S9).
[0042]
The above-described steps S5 to S9 are inspections at a room temperature of 40 ° C. When the inspection at 40 ° C. is completed, the air conditioner 60 is operated so that the room temperature becomes 0 ° C. Thereafter, the inspection is performed in the same manner as in Steps S4-S9, and further, the inspection is shifted to the next set room temperature of 20 ° C., and the inspection is performed in the same manner as in Steps S4-S9 (Step S10).
[0043]
When all the weighing inspections are completed, printing of the stored weighing data, analysis of the weighing data, and the like are performed according to the settings of the personal computer 20. The unattended automatic temperature characteristic measurement operation is thus completed (step S11).
[0044]
Next, a description will be given of whether the operator determines whether or not the measuring device 18 is acceptable. By operating the personal computer 20, the pass / fail determination means 27 is operated, and the weighing data stored in the storage means 25 is displayed on the display device 42, or the printed weighing data is viewed. The weighing data includes an inspection weight, a weighed value when a weight is mounted on the inspection weight, an allowable range of error, a room temperature, a result of pass / fail determination, and the like. These are displayed in a list for each model. The operator can judge the pass / fail accurately without looking at the list and performing complicated judgment work without relying on the memory.
[0045]
The embodiment described above is not limited to this, except for basic operations such as automatically mounting the weight 30 and storing the measured value. For example, the model of the weighing device 18 and the inspection weight may be selected and determined by operating the personal computer 20. In other cases, the room temperature may be set arbitrarily, and the driving source of the weight lifting / lowering means G and the horizontal moving means F may be used. Various means that act in the same manner, such as turning air into air, are employed.
[0046]
Further, the personal computer 20 instructs the model determination, the temperature control, and the movement of the weight group B in this order, but may instruct the temperature control to operate first.
[0047]
【The invention's effect】
As described above, according to the first aspect of the present invention, the automatic inspection apparatus has means for confirming the model, which is troublesome for confirming the model and for mounting the weight of the inspection weight according to the model. It is possible to omit troublesome human work such as recording the weighing value, automatically load the appropriate weight on the weighing machine depending on the model, and memorize the weighing value. Is inspected. In addition, this measurement inspection has an advantage that it can be used for accurate pass / fail judgment without error or erroneous judgment due to the habit of the operator.
[0048]
According to the automatic measuring device inspection apparatus according to claim 2, in addition to the lifting / lowering means for the weight group, the apparatus includes a horizontal moving means for the weight group, so that a plurality of adjacent measuring instruments can be automatically inspected. For example, 24 hours can be effectively used as an inspection time, such as the use of a test, and the inspection efficiency can be improved.
[0049]
According to the automatic inspection device for a measuring instrument according to claim 3, in addition to the automatic inspection device according to claim 1 or 2, the automatic inspection device is installed in a room where the temperature can be controlled, so that the use environment can be reduced. In addition to the ability to perform a suitable inspection, the time-consuming temperature control is automatically performed, so that the inspection can be performed for 24 hours, and the inspection efficiency can be significantly improved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a main part of an automatic inspection device for a weighing machine according to an embodiment of the present invention.
FIG. 2 is an overall front view of the automatic inspection apparatus shown in FIG.
FIG. 3 is a flowchart for explaining the operation of the automatic inspection device shown in FIG.
[Explanation of symbols]
14 Room 16 Horizontal base 18 Meter 20 Personal computer 22 Model determination means 23 Weight selection means 24 Weight control means 25 Storage means 26 Horizontal movement control means 27 Pass / fail determination means 28 Temperature control means 30 Reference weight 60 Air conditioner (temperature controller)
B Weight group F Horizontal moving means G Weight lifting means

Claims (3)

A weight group with weights connected in tandem, weight lifting / lowering means for lowering, stopping and raising the weight group, a model determination means for specifying the model of the measuring instrument to be measured, and a model specified by the model determination means Weight selecting means for selecting a weight to be performed, weight controlling means for controlling the weight elevating means so as to mount the weight selected by the weight selecting means on the measuring instrument, and when the selected weight is mounted on the measuring instrument. Storage means for storing the weighed value of, and a pass / fail determination means for determining the pass / fail of the weighing device from the weighed value stored in the storage means,
An automatic inspection device for weighing machines, which automatically performs inspection without manual operation after setting the weighing machine. An automatic inspection apparatus for measuring instruments according to claim 1, a horizontal table on which a plurality of measuring apparatuses are mounted, a horizontal moving means for moving the weight group in the horizontal direction, and a horizontal movement controlling means for controlling the horizontal moving means. With
An automatic inspection apparatus for measuring instruments, wherein a plurality of measuring instruments can be automatically inspected. An automatic inspection device for a measuring instrument according to claim 1 or 2, a room for shutting off the automatic inspection device from the outside air, a temperature controller for adjusting a temperature of the room, and a temperature of the room from a low temperature to a high temperature. Temperature control means for setting the plurality of temperatures in time series and controlling the temperature controller in accordance with the settings,
An automatic measuring device inspection device characterized by automatically measuring a change in a weighing value due to a change in temperature.

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