JPS5811816A - Weighing device for vehicle - Google Patents

Abstract

PURPOSE:To eliminate the need for fundation work which costs fabulously, by detecting shearing stress that a wheel to be measured gives to a track through a shearing stress detector provided to the side of the track, and calculating vehicle weight and loading weight on the basis of the signal of the detector. CONSTITUTION:A stop position detector 4 detects a wheel to be measured of a vehicle on a track 2 being at a prescribed measurement position when the wheel is at a still. Shearing stress detectors A and B detect shearing stress that the wheel to be measured gives to the track 2. Output signals of the detectors A and B are amplified by amplifiers 17 and 18, whose outputs are sent to a mean value arithmetic circuit 19 which calculates the mean value of a load on the track 2, and the resulting signal is outputted to an arithmetic circuit 20 for the weight (w) of loaded metal. A circuit 22 for calculating the total weight W of a metal mixer car 1 adds the output signal (w) of the circuit 20 to the weight W0 of the unloaded metal mixer car 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention detects the total shear stress exerted on the track by the wheels to be measured when an L vehicle installed on a track is at a predetermined stop position, and this detection signal indicates the vehicle weight and/or loading. This invention relates to a weighing device for vehicles that calculates and displays weight.

Conventionally, methods for measuring the weight ik of a vehicle running on a track include a method of attaching a strain gauge or the like to the bottom of the track and measuring the weight of the vehicle from the strain or deflection of the track when the vehicle passes; There is a method in which a load transducer is installed at a supporting point and the displacement of this load transducer is measured. However, in the former case, there is a drawback that measurement errors occur depending on the support of the track, and in the latter case, it is necessary to cut the track at the measurement point and install a load transducer at the cut part. There was a drawback that the work was a big loss.

Maintenance and inspection are difficult for both the magician and the latter, and basic work is required! The drawback was that the cost required for 1K was enormous.

On the other hand, in the case of a torpedo car, which is built on the track between a blast furnace and a steel factory and transports the molten pig iron tapped from the blast furnace to a steel factory, etc., the loaded weight, or the amount of pig iron received, It is necessary to measure the entire pig iron weight. Conventionally, this has been measured using a load cell method, an electrode method, or a non-contact method using ultrasonic waves, microwaves, or the like.

However, in the case of the IT quantity measurement method that uses load cells, the foundation work under the load cells is a major loss and costs a huge amount, and when the load cells are burnt out due to boiling water or when they are periodically repaired or replaced, The work was difficult. Moreover, it was difficult to apply it to blast furnaces that were already in operation due to the above-mentioned foundation work. In the case of electrode method, 1M,
It is necessary to bring the pole into contact with the hot metal, but it is impossible to do so all the time, so measurements can only be carried out intermittently. In addition, the electrode rods are subject to rapid wear and tear, resulting in high running costs. Also, there are disadvantages in that a dedicated opening for inserting the electrode rods is required in the pig iron mixing car, and furthermore, the application to operating blast furnaces takes up less space on the tapping floor. There was a drawback that it was not easy to implement. Non-contact methods using ultrasonic waves or microwaves have the advantage of being able to perform continuous measurements, but they have almost the same drawbacks as the electrode rod method.

In short, conventional methods for measuring vehicle weight and Mj1 have many drawbacks, and there is room for improvement.

The present invention improves and eliminates the above-mentioned drawbacks of conventional devices for measuring vehicle weight and loaded weight.
When the target wheel of a vehicle installed on the track is at a predetermined stopping position wVc between the sleepers of P9T, the shear stress applied to the track by the target wheel is detected by a shear stress detector installed on the abdomen of the track. The object of the present invention is to provide a compact weighing device that calculates and displays the vehicle weight and/or loaded weight using this detection signal, and does not require foundation work.

The structure of the present invention will be explained below based on the embodiment shown in the drawings.

FIG. 1 is a system diagram showing the entire 8JI device of the present invention. In the same figure, l is the stopping position i of the pig iron mixer car %l installed between the left and right parallel tracks 2.3 so that it can run freely.
It is a detector that detects t. This stop position detector 4 is connected to the wheels 5 to be measured of the iron/pig mixer truck l shown in FIGS. 2 and 3.
．． 6 is within a measurable range between predetermined sleepers 7 and 8. For example, a cam (not shown) is provided on the pig iron mixing car l side, and the track 2 A switch mechanism may be fixedly provided near the position 3, or a position detection mechanism using a photoelectric detection element may be used. The specific method is not the issue here.

Both A and B are bilateral flanks 2a with % orbits 2 and 3.

At 2b, 3a, and 3b, one strain gauge 9 as shown in FIGS. 4 and 5 is provided, and these are connected in the manner described later to detect shear stress using multiple strain gauges 9. It is a vessel. The strain gauge 9 described above can be assembled by gluing, wiring, and
In order to simplify, equalize, and shorten the moisture-proofing work, as well as to sufficiently maintain the gauge IO and further improve Kfl accuracy, the gauge IO is covered with an aluminum case 11 and the terminal of the gauge IO is connected to the cord 12. Then, the cord 12 is removed from the case 11. 131-1 packing, 14 fl pressurized rubber material. The strain gauge 9 can be easily attached to each track abdomen by simply fastening it with a screw member or the like. After the strain gauge 9 is installed, a box-shaped protector 15 is placed over the strain gauge 9 as shown in FIG. All you have to do is improve the temperature by 8 degrees and extend the lifespan.

The arrangement and connection method of each strain gauge 9 is as shown in FIG. 2a
A total of eight strain gauges 9 are placed on , 2b, 3a, and 3b,
A friend strain gauge 9 placed on each track abdomen at a distance l from the sleeper 7 is connected in a prescribed manner to form a shear stress detector A, and each strain gauge 91 located at a distance l from the sleeper 8 is similarly connected. The wires are connected to each other to form a shear stress detector B.

The output signals of these shear stress detectors A and B are amplified by amplifiers 17 and 18, respectively, as shown in FIG. and then output to the received pig iron weight calculation circuit 20. Reference numeral 21 denotes a display meter for the received pig iron weight W calculated by the received pig iron weight calculation circuit 20. 22 is a circuit that calculates the total weight W of the pig iron mixing car l, and the output signal W of the received pig iron weight calculation circuit 20 is
And the empty weight of pig iron mixer car 1 is Wo1! : Find by adding.

Empty weight W of mixed pig iron car L. Each time the pig iron mixer 1 discharges hot metal at a steelmaking factory, the current pig iron mixer IT, that is, the empty car type ftwo, is measured by a weighing machine 23, and this signal is stored in a computer 24 that performs process control of the entire blast furnace. You can store it and take it out from the computer 24 when necessary.

25 is a display meter that displays the total weight W of the pig iron mixer car. 2
6, from the signal of the stop position detector 4 of the pig iron mixer car 1,
Judgment of whether the stop position is good or bad and the shear stress detector A at that time,
A calculation circuit 27 calculates the sensitivity k of B (this will be described later), and 27 is an abnormal f-axis device at the stop position of the pig iron mixer.

The device of the present invention is configured as described above, and detects the shear stress applied to the tracks 2 and 3 by the wheels 5 and 6 to be measured, and measures the vehicle weight and loaded weight from the detected signals. The principle is as follows.

That is, as shown in Figure 7 (a), now the fulcrum 2
Suppose that a wheel load P is acting on the track 30 supported by points 8 and 29, then the arbitrary cross sections C and DK of the track 30 are
The shearing force at is as shown in Figure (b) and Figure (Q) of the same figure.

The shearing force Qc at the 0 point is as shown in Figure 1 (b) (
, 1: L=yc : dyc=-...fxl is obtained, and therefore the distribution of shearing force acting uniformly on the range C from the fulcrum 28 of the track 30 to the point of application of the load P is Qc Light, Qc = -・P ......, as it is calculated by (2), (2) 2K (Including formula 11, Qc = yc *
P -'---'--- [31. Similarly,
Shear force at point D -Q (1 is from figure (0) 1: L=yc: cyd=-... (4) Range from fulcrum 29 of track 30 to point of application of load P The distribution of shear force acting uniformly on d, -Qd, is determined by -Q(L=-1・P... (5), so if equation (5) and equation (4) are included, - Qd = −yd @P
...(6).

Next, when we calculate the sum of the above equations (3) and (6), we get Qc +
(Qd) = (yc yd) P-(d)P = P (7) is obtained. In other words, as is clear from the above, by finding the sum of the shear stress at two points on the track 300 equidistant from the fulcrums 28 and 29, it is possible to find the load MP acting on the track 30. The present invention applies this principle.

Assuming that the pig iron mixer 1 stops directly below the molten pig iron gutter of the blast furnace and the wheels 5 and 6 to be measured are outside the measurable range between the predetermined sleepers 7 and 8, the apparatus light of the present invention detects the stop position. Judgment of pass/fail of arithmetic unit 26 based on the signal outputted from 4 units.
A doubled signal is output and displayed on the stop position abnormality alarm device 27. This means that when the stopping position of the wheels 5 and 6 to be measured deviates from the center between the sleepers 7 and 8 in the left-right direction in FIG. 2, the outputs of the shear stress detectors A and B will be Since the value changes, ±100g11 (For convenience, if it shifts to the left in Figure 2, it is 19. If it shifts to the right, it is 10.) If it deviates, the error increases and measurement becomes impossible, so this is displayed. This is to do so.

Therefore, in this case, the measurable range is ±100 degrees from the center between the sleepers 7 and 8.

If the wheels 5 and 6 to be measured are within the above measurable range, the shear stress detectors A and B tri and the wheels 5 and 6 to be measured apply to the tracks 2 and 3.
The signals a and b'i are detected at predetermined locations and output to the average value calculation circuit 19. The average value calculation circuit 19 can calculate the signal output # corresponding to the load (mixed pig iron car weight) applied to each track 2 and 3 by summing the signals a and bi. Signals a and b of devices A and B
is obtained in both orbits 2 and 3 and is a friend, so
This needs to be divided into two equal parts and averaged. In other words, the signal output gVis'a+b for mixed pig iron vehicle weight *Vc@a
It is necessary to find it using (8). As a result, an output signal ε that uniquely corresponds to the load of the pig iron mixer car 1 (the amount of pig iron mixer car M) is obtained (see FIG. 9). As the curve shown in FIG. 9 is smooth, it is linearly proportional to the weight of the pig iron mixer car and the output signal ε. Then, the output signal ε is input to the next received pig iron weight calculation circuit 20Vc.

Next, with reference to the average value equation 'x shown in Fig. 10 and the characteristic curve diagram of the signal ε obtained in circuit 19 from the time when the pig iron mixer car stops until it completes receiving pig iron and leaves the car, the weight of the received pig iron is determined. The calculation procedure will be explained. First, in the received pig iron weight calculation circuit 20, since the signal ε is not stable at the beginning of the stop of the pig iron mixer 1, after the pig iron mixer 1 stops, the stable signal value α after a certain period of time is stored. . After that, when tapping from the blast furnace to the mixer car l starts, the output signal ε of the average value calculation circuit 19 increases,
Tapping is completed and stabilizes at point m. Here, the received pig iron weight calculation circuit 20 calculates the received pig iron weight W from the time of the start of tapping to the time of completion of tapping, from the stored value α and the output signal value β after the start of pig iron receiving, as follows: w=k( β-αn... (9) However, kV:
It is determined by the calculation method of 1 strain weight conversion coefficient (constant). Then, this is displayed continuously with a total of 21 VC power. By the way, as shown in FIG. 11, the constant kV'i of the above equation (9) changes at the stop position of the pig iron mixer 1.

Therefore, in the present invention, the constant k is dynamically corrected by making the stop position of the pig iron mixer truck l correspond to the sensitivity of the shear stress detectors A and B at that time, thereby obtaining accurate measurements. There is. This constant is corrected by the stop position detector 4ρ.
This is an arithmetic circuit 26 that inputs the output signal of Shima et al. The corrected output signal k from the arithmetic circuit 26 is included in the received pig iron weight calculation circuit 2° in (9)2 to obtain the received pig iron weight W.

Next, the device of the present invention calculates the degeneracy fWt of the pig iron mixer car l. It can be easily obtained by converting the signal value β after the start of pig iron receiving, which is input to the received pig iron weight calculation circuit 20, into weight in the general army 1itW. However, since the device of the present invention omits the foundation work and only installs the shear stress detectors A and B at the abdomen of the orbit, the zero points of the detectors A and B may slightly fluctuate during measurement.

Ru. Therefore, the method of determining the total weight of the pig iron mixer car using the signal value β has a problem in accuracy and is not preferable.

Therefore, in the present invention, the total N-scene calculation circuit 22 for the mixed pig iron car
The total weight W is determined. This arithmetic circuit 22
As mentioned in 111, the total MtttW(!-1
gU-recorded pig iron weight W and empty car weight W of mixed pig iron car L. Totara is a rumor calculated using the formula: W=w+w, −−−−−−−+IO+. And this is the total N obtained from VC
In this way, the shear stress applied to the tracks 2, 3 by the wheels 5, 6 to be measured of the uninvented device 1J pig iron mixer 1 is detected.
The received pig iron weight W and the total weight W of the detected signal machined pig iron mixer car 1 are all calculated. It should be noted that although the above-mentioned example apparatus was used only for wheels 5.6 to be measured, it is possible to further improve accuracy by increasing the number of wheels to be measured.

As explained above, according to the present invention, a wheel to be measured of a vehicle installed on a track is set at a predetermined stopping position f between sleepers with l'jr constant.
fff1, the shear stress applied to the track by the wheel to be measured is detected by a shear stress detector installed on the abdomen of the track, and the vehicle weight and loaded weight are calculated and displayed using this detection signal. The structure is extremely simple,
Foundation work that requires huge amounts of money is the norm. Moreover, it can be easily installed on existing tracks, and there are no space problems. Furthermore, it has many advantages such as easy maintenance and inspection.

[Brief explanation of the drawing]

Fig. 1 is an overall system diagram showing an embodiment of the device of the present invention, Fig. 2 is a schematic plan view showing the arrangement of shear stress detectors, Fig. 3 is a perspective view of the main part of Fig. 2, and Fig. 4 is a schematic plan view showing the arrangement of shear stress detectors. FIG. 5 is a plan view of the strain needle, FIG. 5 is a vertical cross-sectional view of the strain meter, FIG. 6 is a vertical cross-sectional view of the track showing the mounting relationship of the strain meter, FIG. 7 is a drawing explaining the basic principle of the present invention, and FIG. Figure 8 shows the relationship between the position of the wheel to be measured and the output of the shear stress detector, Figure 9 shows the relationship between the output of the shear stress detector and the weight of the mixed pig iron car, and Figure 10 shows the shear stress detection. FIG. 11 is a diagram showing the output of the device and the work process, and FIG. 11 is a diagram i1r+ showing the relationship between the stopping position of the wheel to be measured and the sensitivity of the shear stress detector. 2, 3... Track l... Vehicle (mixed iron car 5, 6...
・Measurement target wheels 4...stop position detectors A, B...
・Shear stress detector 20... pig iron receiving heavy view calculation circuit 22
...Pig iron car F,, weight calculation circuit special applicant, Sumitomo Kinko Kuri Co., Ltd. Patent attorney A1 Toshihiko

Claims (1)

[Claims] ■ A vehicle stop position detector that detects the width of the measurement target wheel of a vehicle installed on the track at a measurement position of 1 cPi JT when the vehicle is stopped, and a vehicle stop position detector that detects all the shear stress that the measurement target wheel applies to the track. A shear stress detector installed at the abdomen of the track, and a signal of the shear stress detector, vehicle weight, and fl.
*A vehicle weighing device characterized by being compatible with a computing unit that calculates loaded weight■.