JPH0441291B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a moment balance device used for balancing the rotational moments of blades when a plurality of blades are radially attached to a rotating shaft in a blower or the like.

The structure of an example of a conventional moment balance device of this type is shown in FIGS. 1 to 3. FIG. 1 is a schematic side view thereof, FIG. 2 is a plan view thereof, and FIG. 3 is a cross-sectional view (in the direction of - arrow in FIG. 1).

In the figure, reference numeral 1 denotes a balance, and support plates 1a provided on both sides of the intermediate portion thereof are rotatably supported by support columns 2 via support shafts 3 and bearings 4, respectively. 5 is a blade, that is, an object to be measured, and 6 and 6' are weights. Note that 1b and 1b' are stops to prevent the weights 6 and 6' from shifting, and 1c is a groove formed in the main body of the balance 1, which allows the stops 1b and 1b' to slide and It can be fixed in any position. Further, 1d and 1d' are receivers for the object to be measured 5, and 1c is also a cut groove formed in the main body of the balance 1, which allows the receivers 1d and 1d' to slide and be fixed at arbitrary positions. I'm starting to get it.

In a conventional device having such a configuration, moment balance was achieved in the following manner.

(a) Place the object to be measured (wing) 5 with the smallest weight on one end of the balance 1, and place a weight 6 on the other end for balance.

(b) Replace the object to be measured 5 with the next object to be measured, add another weight 6' on top of the weight 6 until the balance 1 is balanced, and record the total weight of the weights 6 and 6'. put.

(c) Based on the data of the weight of the objects to be measured repeatedly performed as described in (a) above, the arrangement of the objects to be measured 5 in the circumferential direction of the rotation axis is calculated and determined by a computer.

However, the above-mentioned conventional device had the following problems.

(a) Since balance 1 is used, it takes time to balance.

(b) A large number of weights 6, 6' of different weights are required.

(c) Weight measurement errors occur due to the frictional resistance of the bearing 4 used as the fulcrum of the balance 1.

(d) Measurement and data processing are separated and performed in different locations, so it takes a lot of time to get results.

The present invention was made in view of the above-mentioned circumstances, and includes a horizontally installed flat plate-shaped measuring instrument stand,
A pair of weight measuring instruments placed at a distance on the same pedestal, and a pair of weight measuring instruments placed astride both weight measuring instruments,
and a measuring object mounting jig having measurement distance determining pieces fixed to both ends of its lower surface, a mounting jig positioning member erected on the mount and engaged with the center part of the mounting jig, and the weight. The main idea is to have an A/D converter connected to each measuring instrument and a personal computer connected to the A/D converter, so that measurements and data processing can be performed in a short time without using weights or balances. The purpose of this invention is to provide a moment balance device that allows

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

4 and 5 show the overall configuration of the device of this embodiment, FIG. 4 is a plan view thereof, and FIG. 5 is its (
- arrow view) is a side view.

In the figure, reference numeral 11 denotes a nearly rectangular measuring instrument stand, which is installed almost horizontally. 12,12'
are two weight measuring instruments, and as shown in the figure, mount 1
They are respectively arranged on both longitudinal ends of the top. Reference numeral 13 denotes a measuring object mounting jig in the form of a long plate, which is disposed astride both the weight measuring instruments 12 and 12', and has semi-cylindrical measuring distance determination fixtures at both longitudinal ends of its lower surface. Piece 14 is fixed. 15 are two round bar-shaped mounting jig clasps;
It is erected on the pedestal 1 and engaged with both sides of the middle part of the mounting jig 13. Reference numerals 16 and 16' designate two BCD converters, which are A/D (analog-to-digital) converters connected to the weight measuring devices 12 and 12' via cables 17 and 17', respectively. 18 is a so-called personal computer, and cable 1
It is connected to BCD converters 16, 16' via 9, 19'. In addition, 20 and 20' are the object to be measured 5
(indicated by phantom lines) a receiving jig for supporting 13
A is a receiving jig mounting groove provided along the longitudinal direction at both ends of the mounting jig 13, and the receiving jig 20' is slidable along the receiving jig mounting groove 13a and can be placed at any position. The receiving jig 20 is fixed on the mounting jig 13 so as to face the receiving jig 20'. Reference numeral 21 denotes a plurality of weight measuring device clasps installed on the pedestal 11.

Let's briefly explain the functions of each part. The measuring distance determining piece 14 is used to keep the distance (A and B in FIG. 5) constant from the mounting reference surface C of the object to be measured 5 to the point of action of gravity on the weight measuring instruments 12, 12'. The mounting jig stopper 15 is provided to prevent the mounting jig 13 from shifting. Also,
BCD converters 16, 16' are weight measuring devices 12, 1
For example, the weight output from 2' in the form of voltage is converted to BCD.
This BCD output is input to the personal computer 18 via cables 19, 19' and processed as data.

Next, the operation in such a configuration will be explained.

By placing the object to be measured 5 on the object to be measured mounting jig 13, weight is applied to each of the weight measuring devices 12 and 12' via the measurement distance determining piece 14. This weight is taken out as a voltage by the weight measuring devices 12, 12', and the voltage, which is an analog quantity, is output from the cable 1.
7 and 17', the signal is transmitted to BCD converters 16 and 16', where it is converted into a BCD signal which is a digital quantity. This BCD signal is input to the personal computer 18 via a cable and data processed.

FIG. 7 is a block diagram showing the above-mentioned structure according to its functions.

Measured values taken out as voltages in this case from the weight measuring devices 12, 12' are converted into digital signals by BCD converters 16, 16', which serve as weight indicators and A/D converters. In this case, it is assumed that the BCD converters 16 and 16' perform BCD conversion and weight display at the same time. The personal computer 18 mainly includes a microprocessor (central processing unit) 2.
2, a memory (storage device) 23, an interface (input/output signal processing circuit) 24, a display device 25, and a printer 26.

The weight signal A/D converted and digitized by the BCD converters 16 and 16' is sent to the interface 2.
4, the data is converted into a form that can be handled by the microprocessor 22, and then sent to the microprocessor 22.
It is temporarily stored in the memory 23. When the measurement of the object to be measured 5 is completed, the data is retrieved from the memory 23 again, and the microprocessor 22 calculates the amount of moment, arrangement, unbalance, etc., and displays the calculation results on the display device 25, as well as the printer. 26 to be printed.

Here, for reference, the principle of calculating the amount of moment will be explained with reference to FIG. 7.

In the figure, W is the weight of the object to be measured 5, W1 is the weight applied to the weight measuring device 12 (weight after removing the tare), and W2 is the weight applied to the weight measuring device 12' (weight after removing the tare). , L is the piece 1 for determining both measurement distances
4, L2 is the distance from the mounting reference plane C to the center of gravity, and R2 is the distance from the center of the rotating body formed by the object to be measured 5 to the mounting reference plane C, then W=W1+W2 L2 =L×(W2/W)−A, and therefore the moment M is expressed by the following equation.

M={W×(R2+L2)}/1000 [g·M] FIG. 8 is a flowchart showing details of moment balance calculation in the personal computer 18.

According to this embodiment described above, the following effects can be obtained.

(A) Weight measurement results can be obtained online using a personal computer, eliminating the need for analysis of measurement results and greatly reducing the number of man-hours required for measurement.

(B) No balance or weight required.

(C) Higher measurement accuracy can be obtained compared to conventional methods.

(D) Work efficiency is improved because measurement and data processing are integrated.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without changing the gist thereof.

As detailed above, in the present invention, a horizontally installed flat plate-shaped measuring instrument mount, a pair of weight measuring instruments arranged at intervals on the mount,
A measuring object mounting jig which is placed astride both weight measuring instruments and has measurement distance determining pieces fixed to both ends of its lower surface; The engaged mounting jig positioning member and the A/D each connected to the weight measuring device.
The object of the present invention is to provide a moment balance device that is equipped with a converter and a personal computer connected to the A/D converter, and can perform measurement and data processing in a short time without using weights or balances. was completed.

[Brief explanation of the drawing]

1 to 3 are a side view, a plan view, a sectional view, and a 4th sectional view showing the schematic configuration of an example of a conventional device, respectively.
5 and 5 are a plan view and a side view, respectively, showing the overall configuration of an embodiment of the present invention, FIG. 6 is a block diagram showing the functional configuration of the embodiment, and FIG. 7 is a diagram showing the amount of moment in the embodiment. FIG. 8, which is a diagram for explaining the calculation principle, is a flowchart showing moment balance calculation processing in the personal computer in the same embodiment. 11... Frame, 12, 12'... Weight measuring device,
13...Measurement object mounting jig, 14...Measurement distance determination piece, 15...Mounting jig clasp, 16, 16'...
...BCD converter, 17, 17', 19, 19'...
Cable, 18...Personal computer, 2
0,20'...Receiving jig, 21...Weighing instrument clasp.

Claims (1)

[Claims] 1. A flat plate-shaped measuring instrument stand installed horizontally,
A pair of weight measuring instruments placed at a distance on the same pedestal, and a pair of weight measuring instruments placed astride both weight measuring instruments,
and a measuring object mounting jig having measurement distance determining pieces fixed to both ends of its lower surface, a mounting jig positioning member erected on the mount and engaged with the center part of the mounting jig, and the weight. A moment balance device comprising an A/D converter connected to each measuring instrument and a personal computer connected to the A/D converter.