JPH0148578B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for evaluating the strain on the upper limbs that can be used to investigate and evaluate the strain on the upper limbs during work with simple operations on the spot.

(Prior art) As a method for evaluating upper limb strain, for example,
As disclosed in Publication No. 59-75079, the operation time of each operation classified as basic manual labor is recorded in the upper limb point survey table, and the holding time and operation time of each tool used are individually recorded using a stopwatch. The method used was to measure and record information.

(Problem to be Solved by the Invention) However, with this method, it is not possible to measure various times at once with a stopwatch when there are many manual operations or tools, so for example, when the same work is repeated in line work, If the machine is used, the first machine measures the time for one manual task, and the second machine measures the time for the next manual task, which takes a considerable amount of time. Since this process is time-consuming and complicated, it has the disadvantage that errors are likely to occur in the tabulation.

The present invention solves the above-mentioned drawbacks in upper limb load evaluation, and allows movement time, holding time, and
Operation time can be measured, and manual operation point can be measured on the spot.
To provide an upper limb strain evaluation device capable of calculating a holding force point and an upper limb point and displaying the results.

(Means for Solving the Problems) The upper limb strain evaluation device of the present invention includes a means for calculating a manual movement point from a score weighted according to the magnitude of the upper limb strain for each manual movement and the duration of the manual movement. , means for calculating a holding force point from points weighted according to the magnitude of upper limb burden for each tool used and the time taken to move and operate the tool by the worker; and means for calculating a holding force point from the manual movement point and the holding force point. The present invention is characterized by comprising: means for calculating points; and means for outputting the manual action point, the holding force point, and the upper limb point.

(Function) According to this configuration, the manual motion point is calculated from the measured value of the duration of manual motion at the site, and the holding force point is calculated from the measured values of the tool travel time and operation time when the worker uses the tool. is calculated,
An upper limb point is calculated based on the hand movement point and holding force point determined by the calculation, and the resulting hand movement point, holding force point, and upper limb point are displayed, respectively.

Therefore, when evaluating arm burden, the above results are automatically displayed by simply measuring the above-mentioned times, thereby reducing the time required for arm burden assessment and providing more reliable data.

(Example) Hereinafter, one example of the present invention will be explained with reference to the drawings.

As shown in FIG. 1, switches necessary for operation are attached to the front of a case 1 of the device.
A manual operation point switch 2 with numbers 0 to 9 displayed on the switch surface is provided at the lower left of the case 1, and display patterns of classified manual operations are shown on the left side of each switch. This manual operation point switch 2 is used as a switch for measuring the moving time of the tool when measuring the holding force point, as a switch for inputting the number of points during operation and storing the moving force point, and as a switch for inputting the number of units when storing the number of production units. At the upper left side of the manual point switch 2, there is provided an operation switch 3 with the word ``operation'' displayed on the switch surface. This operation switch 3 serves as a switch for measuring operation time when measuring the holding force point, and serves as a switch for adding twist points for each motion when measuring the manual motion point. Further, when storing the operating force point, by pressing the operation switch 3, the mode is switched to the moving force point storing mode, and by pressing the manual operating point switch 2, the moving force point can be stored. A memory switch 4 with the word "memory" displayed on the switch surface is provided on the right side of the operation switch 3. By pressing this memory switch 4 when measuring the holding force point, the mode is switched to the operation force point storage mode, and in this mode, the manual operation point switch 2 and the operation switch 3 are pressed to memorize the operation force point and the moving force point. A changeover switch 5 with the word ``switch'' displayed on the switch face is provided on the right side of the memory switch 4 for mode switching between manual operation point measurement and holding force point measurement. A clear switch 6 is provided below the changeover switch 5 and on the right side of the manual point switch to replace the displayed calculation result with zero. A measurement switch 7 is provided below the clear switch 6, which is pressed when starting time measurement when measuring a manual operation point or a holding force point. A result switch 8 is provided below the measurement switch 7, which is pressed when the measurement of the manual operation point and the holding force point is completed to perform calculations and display the results. When the result switch 8 is further pressed after displaying the calculation result of the hand movement point or the holding force point, the upper limb point evaluation result derived from the hand movement point and the holding force point is calculated and displayed.

Further above the operation switch 3, memory switch 4, and changeover switch 5, there is a numerical display section 9 made of liquid crystal (or light emitting diode) that displays the calculation results.
Centering on point a, a mode display section 9b is arranged in parallel above the numerical display section 9a, and a battery consumption display section 9c with the characters BATT displayed on the display surface is provided at the lower left side of the numerical display section 9a. will be established. The mode display section 9b displays, from the left side, operation force point memory, upper limb point, holding force point, and manual operation point, and letters indicating display contents are arranged above the display lamp. A power switch 10 is provided on the side of the case 1 of this device.

As a display for associating these switches with the display section, an arrow is drawn from the memory switch 4 to the operation switch 3, a letter indicating the movement power point is placed above it, and an arrow is drawn from the memory switch 4 to the changeover switch 5 to indicate the return point. Characters are provided, double-arrowed lines are provided between the displayed character holding force point of the mode display section 9b and the manual operation point, and the center of these double-arrowed lines is connected to the right side of the changeover switch 3 with a line.

As shown in FIG. 2, when the switches 2 to 8 are collectively displayed as a switch group 11, they are connected to a central processing unit 12, and the data input from the switch group 11 is processed by the central processing unit 12. do. A liquid crystal operating device 13 for operating the display section 9, a voltage drop detector 14, and an oscillator 15 of a piezoelectric buzzer 16 that generates an intermittent sound during time measurement are connected in parallel to the central processing unit.

As shown in FIG. 3, in the apparatus configured in this manner, when the power switch 10 is turned on, the manual operating point measurement mode is entered for the first time, so the manual operating point mode display 9b lights up. If the manual operation point is to be measured first, the next switch operation is performed as is (without pressing the changeover switch 5).

First, the number N of units produced per day is input using the manual point switch 2 (step 19 in the figure). next,
Press the measurement switch 7 and classify the hand motions of one machine during work according to the hand motion display pattern written on the left side of the hand motion point switch 2 (the numbers on the switch surface indicate the weighting of each motion). (However, 10 points are given to the switch with number 9.) Continue pressing each switch while holding the corresponding action. By performing this for only one operation, the time Ti (seconds) corresponding to the number i of each operation is measured and stored. In addition, if each movement involves twisting or bending the wrist, switch the manual operation point switch 2 at the same time as the operation switch 3.
Hold down while the twist continues. As a result, the operation time Ti ₊ 2 points plus 2 twist points
(seconds) (step 20).

After the measurement is completed, press the result switch 8 to calculate the manual operation point according to the following formula (step 21).

Manual operation point (α)=N/3600 〓 ⁱ (i×Ti) (1) Display the value of the manual operation point (α) on the numerical display section 9a as the calculation result (step 22). Furthermore, the result switch 8 is pressed to calculate and display the upper limb point (γ) by adding the previously calculated holding force point (β) and manual action point (α) using the following formula (steps 23 and 24).

Upper limb point (γ) = manual movement point (α) + holding force point (β)
...(2) At this time, if the holding force point (β) is not calculated in advance, the value of (β) is calculated as zero (0). The calculation results are displayed on the display section 9 together with the display mode.

In order to change the measurement content to holding force point, the changeover switch 5 is pressed (step 25), and the display mode changes to holding force point display, indicating that holding force point measurement is being performed. If the number of production units has been input during manual point measurement, there is no need to input it again (step 26).
Check the tools used during work (e.g.
Assuming that the result is as shown in the figure), the operation force points 34 and movement force points 35 are classified and illustrated as input data.
Press the memory switch 4 to display the operation power point memory indicator light 9.
After confirming that b lights up, press manual operation point switch 2 to input operation force point _W1 . After this, when the memory switch 4 is pressed, the tool number changes by one, so the input of the operation force point _W1 is repeated for the total number of tools (step 27).

After inputting the operating force point W ₁ for all the tools, press the operating switch 3 to switch to the moving force point memory mode. Normally, since there are many moving force points _W2 , 1 is assigned in advance to all tool numbers. For tool numbers that give points other than 1,
The operating switch 3 is pressed to advance the tool number to a predetermined number, and the moving force point W ₂ of the corresponding tool number is input by pressing the manual operating point switch 2, replacing it with 1 (step 28).

After completing the input of the moving force point _W2 , press the changeover switch 5 to return to the holding force point measurement mode.
Continue to press manual operation point switch 2 during the tool holding, movement, and operation times corresponding to the tool number in order, and input the movement time (T ₁ m) and operation time (T ₂ m). Discrimination between movement time and operation time is performed by pressing the operation switch 3 in addition to the manual operation point switch 2 from the time the tool is held and the operation is started.
When the operation is finished and the tool leaves your hand, switch 2,
By ceasing the operation in step 3, the time input is completed (step 29).

Next, when the result switch 8 is pressed, the holding force point (β) is calculated and displayed using the following formula (step 30,
31).

Holding force point (β) = N / 3600 〓 ^m (W ₁ × T ₁ m + W ₂ × T ₂ m) ... (3) Furthermore, when the result switch 8 is pressed, the sum of the manually measured point, i.e. The upper limb points are determined and displayed along with the display mode (steps 32, 3
3).

In this way, a plurality of operating times or tool movement and operation times can be measured with a single switch operation and within the work of one machine. Therefore, on-site measurement time is significantly reduced. Calculation results can be obtained by simply pressing a single switch, which eliminates the need for manual calculations, eliminates calculation errors, and improves the reliability of data. In this way, measurements and calculations become easier, and management data for on-site supervisors can be obtained smoothly, making it easier to proceed with improvements. Furthermore, the ease of measurement and calculation makes it easier to carry out actual measurements of this type, which have traditionally been avoided.

(Effects of the Invention) With the upper limb strain evaluation device according to the present invention having the above-described configuration and operation, it is possible to directly measure and compile data while observing the work at the site, quickly and easily. This type of actual measurement, which is often avoided, will become easier to perform. This makes it possible to obtain a wealth of reliable data on actual work, making it possible to accurately assess the burden on workers.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the device according to the present invention, and FIG. 2 is a block diagram showing the internal configuration of the device according to the present invention.
FIG. 3 is a flowchart showing the operating method of the device according to the present invention, and FIG. 4 is a classification diagram showing an example of the operating power point and the moving power point of the tool. 1...Case, 2...Manual point switch, 3...
...operation switch, 4...memory switch, 5...changeover switch, 6...clear switch, 7...measuring switch, 8...result switch, 9...display section,
12...Central processing unit, 13...Liquid crystal operating device.

Claims (1)

[Scope of Claims] 1. A device for evaluating the strain on the upper limbs of a worker during work, which calculates the manual movement point from the score weighted according to the magnitude of the strain on the upper limbs for each manual movement and the duration of the manual movement. means for calculating a holding force point from a score weighted according to the magnitude of the upper limb burden for each tool used and the time for moving and operating the tool by the operator; An arm strain evaluation device comprising: means for calculating an upper limb point from a holding force point; and means for outputting the hand movement point, the holding force point, and the upper limb point.