JP2995589B2 - Test device for inspection of stationary axle load meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test device for checking a stationary axle load meter, and more particularly to an axle load detection device installed in a traveling road area which receives an analog output from an axle load transmission device. It is recorded on the recording device mounted on the test vehicle and also recorded with the output of the axial force sensor of the axle load test vehicle. The present invention relates to a test device for inspection of a stationary axle meter, which can be used to clarify the cause of the occurrence.

[0002]

2. Description of the Related Art The measurement of the loaded weight of a vehicle is mainly performed on a large vehicle such as a truck. Overloading a truck or the like impairs the operability of the vehicle itself, causing not only a traffic accident, but also a road surface damage and noise pollution.

[0003] Therefore, police and road managers (Road Public Corporation, etc.)
In, the use of a vehicle weight measuring device to determine whether or not the load is equal to or less than the statutory load weight controls or restricts traffic.

Conventionally, as this type of measurement, for example, a load transducer is accurately placed on a loading plate provided at a lower portion, and the wheel weight (hereinafter, referred to as “wheel weight”) or the axle weight (hereinafter, referred to as “wheel weight”) of the vehicle. Axle load)), add these wheel weights and the like to determine the vehicle weight, and further calculate the actual number of passengers and the prescribed vehicle weight (the weight of the vehicle itself) from the vehicle weight thus measured. The so-called stationary axle meter, which calculates the load weight by subtracting, is mainly used.

On the other hand, there is a so-called self-weight meter that mounts a detector on the axle of a vehicle, measures the amount of strain generated on the axle by the detector, and measures the loaded weight (or load) for each vehicle.

Although the self-weight meter has a characteristic that the measured value changes as the vehicle travels despite the fact that the load capacity is constant, the measured value is reproducible at the same place.

[0007]

One of the causes of the decrease in the accuracy of detecting the axle load of a stationary axle load meter, particularly of a running vehicle, is the axle load detection device of the road surface on which the axle load detection device is installed. The resin mortar around the outer frame at the place where the mortar is installed is rutted, and a step generated between the resin mortar and the outer frame is one of the causes.

As a result, as described above, when the traveling vehicle passes over the detecting device, the load becomes an impact load, causing an error in the measured value. At present, this phenomenon is caused by the following: Many toll booths (b) There are two toll booths where the accumulated traffic volume is high, and it is particularly necessary to measure the vehicle loading weight at these two locations.

The axle load detection device is installed at such a location, and as described above, when the vehicle whose load weight is to be measured passes through the axle load detection device, what kind of vibration load is applied to the vehicle If it is known, the reliability of the axle load meter can be checked.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to test the accuracy and responsiveness of an axle load detecting device, determine road surface irregularities and steps, determine axle load. A stationary axle load meter that can clarify the cause of error by actual measurement of the depth of rutting before and after the setting position of the detection device, precisely investigate the place where the error occurred, and objectively and rationally judge the necessity of repair To provide a test device for inspection.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is mounted on an axle of an axle test vehicle, and detects a strain generated on the axle corresponding to the axle load of the axle test vehicle. Axial force sensor, and a strain measuring device that outputs a signal obtained by removing high-frequency components from the output of the axial force sensor, and installed in a traveling path, when the wheel of the axle load test vehicle is mounted on a load plate. An axle load detection device that detects axle load received from the wheels, a processing unit that is disposed near the axle load detection device and performs a predetermined process of an output of the axle load detection device, and is mounted on the axle load test vehicle. A recording device that simultaneously records the output of the strain measuring device and the output of the processing unit, and a transmission unit that is connected between the recording device and the output end of the processing unit and transmits the output of the processing unit to the recording device. Characterized by having .

[0012]

The test device for inspecting a stationary axle load meter configured as described above includes an axle force sensor mounted on the axle corresponding to a known load loaded on the axle load test vehicle. Detects the strain generated on the axle and outputs the detection signal to a strain meter, which removes high frequency components and outputs it to a recording device as a strain measurement output. Record display.

On the other hand, when the axle load test vehicle rides on a load plate installed on the same plane as the traveling road surface, an axle load detection device including a load cell and the like disposed below the load plate becomes an axle load test device. An output signal corresponding to the axle load is output to the processing unit, and the processing unit performs predetermined signal processing to remove high frequency components.
The signal is output from the processing unit as an analog signal to the recording device mounted on the axle load test vehicle via transmission means such as a cable.

In this recording device, the axle load waveform is simultaneously recorded and displayed based on the output signal of the strain meter of the axle load test vehicle and the output signal of the processing section of the axle load detection device. From the comparison with the output signal waveform of the axle meter, whether or not the output value of the axle load detection device is appropriate, the operator can objectively and rationally determine whether or not an error has occurred,
This can be used to clarify the cause of the error.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an entire configuration of an embodiment of a test device for checking a stationary axle meter according to the present invention.

In FIG. 1, reference numeral 1 denotes an axle load test vehicle, and two axial force sensors 2 are attached to a side plate (back plate) of a differential gear case of the axle load test vehicle 1.

As the axial force sensor 2, for example, a sensor with a so-called waterproof protector as shown in FIGS. 2 and 3 is used. FIG. 2 is a plan view of a sensor with a waterproof protector, and FIG. 3 is a cross-sectional view of FIG.

In both FIGS. 2 and 3, the case 2a made of an aluminum alloy die cast has a shape similar to the head of a cobra, and as is apparent from FIG. The gauge 2c is attached by adhesive, and the strain gauge 2c is attached to the side plate of a differential gear case (not shown) by adhesive as well.

In order to surround the strain gauge 2c,
In order to protect the strain gauge 2c from moisture, mud, and the like, that is, the packing 2 is provided on the periphery of the lower surface of the case 2a.
d is attached, and the packing 2d
a and the differential gear side plate are maintained in a watertight state.

The output of the strain gauge 2c is connected to a terminal board 2f through a gauge lead 2e, and the terminal board 2f is connected to a cord core 2h of a cord 2g.
It is connected to the.

The gauge lead 2e, terminal board 2f, cord core 2h, and cord 2g are
i is fixed to the case 2a.

As the strain gauge 2c, a foil strain gauge is used.
A 20 μm insulating base and a 3 to 5 μm grid-shaped patterned resistive foil are adhered and integrated.

This strain gauge 2c is attached to the differential gear case side plate as an object to be measured. In this case, the oxide film on the differential gear case side plate is removed by polishing, and the fabric surface is formed and bonded. Positioning is performed, and an adhesive is applied and bonded.

On the other hand, prior to the bonding, the connection of the gauge lead 2e to the terminal board 2f and the cord core 2
h and so on. Next, the case 2a is fixed with the bolt 2j.
Is fixed to the side plate of the differential gear case, waterproof wax is applied to the case 2a, and the case is fixed with resin or the like.

A constant pressing force is always applied to the strain gauge 2c, and the pressing force is applied to the strain gauge 2c.
The rubber block 2b is pressed against the differential gear case side plate so that the adhesive force of the rubber gear 2 is optimized and the adhesive force can be maintained for a long time.

The strain gage 2c has four strain gages for shear strain detection and is assembled on a Wheatstone bridge (not shown). The output end of the strain gage 2c is detected by the amplifier 3a of the strain measurement device 3 shown in FIG. An output is input, and a bridge voltage from a bridge power supply (not shown) is applied to the input terminal.

The strain measuring device 3 is provided with the axle load test vehicle 1
And an amplifier 3a and a filter 3b. The amplifier 3a amplifies the output of the Wheatstone bridge, that is, the output of the axial force sensor 2, and performs temperature compensation at the same time, and the output of the amplifier 3a is input to the filter 3b.

The filter 3b removes high frequency components (noise) contained in the output signal of the amplifier 3a and outputs the signal to the display device 4 having a recording function.

The display device 4 is mounted on the axle load test vehicle 1,
The output of the filter 3b and the output of a later-described filter of the processing unit on the axle meter side are also displayed. For example, a pen recorder, an oscillograph, or the like is used, and is attached to an instrument panel or the like in a driver's seat.

The axle load test vehicle 1 has a loading plate (shown in the drawing) disposed on the same plane as a road surface of a traveling path installed near a toll booth where heavy vehicles pass or a toll booth where accumulated traffic volume is high. ), And the axle load or the weight of the vehicle is measured.

An axle load detection device (hereinafter, referred to as a "detection device") 5 is arranged on the lower surface of the loading plate. The detection device 5 obtains the loaded weight of the axle load test vehicle 1 by calculating the strain corresponding to the axle load of the axle load test vehicle 1 that is mounted on the loading plate and stopped or running. Although not shown, it is composed of four or six load cells for detecting the load of the front wheel or the rear wheel of the axle load test vehicle 1, and is attached to the lower surface of the load plate described above.

One load cell has four strain gauges attached thereto by means of adhesion, vapor deposition, sputtering, or the like, and these four strain gauges constitute a Wheatstone bridge.

The length L of the load plate in the traveling direction of the axle test vehicle 1 is selected to be larger than the contact width W where the outer periphery of the tire of the axle test vehicle 1 contacts the road surface, that is, L> W. ing.

The output of the detecting device 5 is connected to a connection box 6. The connection box 6 is configured to connect a plurality of Wheatstone bridges constituting the detection device 5 in parallel, and is equivalently configured as one Wheatstone bridge.

The output of the detecting device 5 including the connection box 6 is
The data is input to the conditioner 7a of the processing unit 7. The conditioner 7a performs predetermined waveform shaping, level adjustment, and the like, and its output is input to the filter 7b.

The filter 7b is a filter for removing high-frequency components contained in the output of the conditioner 7a. The output of the filter 7b is
In addition to being connected to the display device 4 mounted on the axle load test vehicle 1, it is also connected to an input terminal of an analog / digital converter 7c (hereinafter, referred to as "A / D converter"). .

The A / D converter 7c digitizes the output of the filter 7b and outputs a digital signal.

When the axle load test vehicle 1 is stopped at a toll booth or the like, the axle load test vehicle 1 is separated from the above-described load plate,
It is located at a distance of 0 m to 30 m. Therefore, 20-3
The cable 8 longer than 0 m is connected between the display device 4 and the filter 7b via a connector (not shown).

The print data is obtained by the processing unit 7.

The operation of this embodiment thus constructed will be described. First, in order to record and display data serving as reference data for the axle load test vehicle 1 on the display device 4 of the axle load test vehicle 1, the reference weight should not be imbalanced on the bed of the axle load test vehicle 1. Load. This weight is, for example, 8
Ton (hereinafter, the unit of ton is represented by "t"), 12t,
The axle load is set by using a 16t.

The setting of the axle load is actually performed by the axle load test vehicle 1
Is set by moving a predetermined reference weight in the front-rear direction on the carrier. In this case, the axle load is set in a state where the drive shaft of the axle load test vehicle 1 to which the axial force sensor 2 is attached (more precisely, the tire supported by the drive shaft) is placed on the above-mentioned load plate.

First, a static load calibration is performed. In this case, after confirming that there is no load on the loading plate of the detecting device 5, the axle test vehicle 1 is mounted on the detecting device 5 with the axle of the drive shaft on which the axial force sensor 2 is mounted, and 8t, 12t, 16
detection device 5 for detecting the static load t through the rear shaft of the axle load test vehicle 1
To load.

Next, the running load calibration is performed. 8t, 12
Approximately 5km / h and 10km / h at each set load of t and 16t
The axle load test vehicle 1 is run twice at the vehicle speed of.

When the axle load test vehicle 1 is placed or run on the loading plate as described above, the output of the detecting device 5 corresponding to the axle load passes through the connection box 6 and is output to the conditioner 7a of the processing unit 7 by a predetermined amount. After the high-frequency component is removed by the filter 7b, the signal is displayed on the display device 4 in the axle load test vehicle 1 via the cable 8.

The calibration result displayed on the display device 4 is as follows:
As shown in FIG. In FIG. 4, the horizontal axis indicates time, and the vertical axis indicates the output of the axial force sensor 2 (axle strain) and the output of the detection device 5. Among them, the disturbance of the waveform of the portion indicated by the circle a in the output calibration value of the axial force sensor 2 is due to the impact of the impact when the wheel is placed on the loading plate. The area indicated by the circle b indicates the output of the axial force sensor and the axis when the load is reduced from 16 t to 12 t by moving the weight from the rear to the front so as to move away from the position of the drive shaft provided with the axial force sensor 2. It shows the process of decreasing the output of the heavy detector,
In general, both outputs show corresponding changes.

FIG. 4 shows the process of calibrating the axial force sensor 2 and the detecting device 5 by changing the load when the axle load test vehicle 1 is stopped from 16 t → 12 t → 8 t (own weight). Is shown.

Next, the measurement of the rut depth, which has a large effect on the axle load value, will be described. Align the center of the 3m ruler with the center of the detector 5 on the left and right lines (running direction line) where the wheels pass, place a level on the upper surface of the ruler, adjust the stands at both ends to keep the ruler horizontal, Slide the probe to measure the distance between the road surface and the ruler at predetermined intervals.

Next, a method for simultaneously measuring the outputs of the axial force sensor 2 and the detecting device 5 to confirm the accuracy and responsiveness of the axle load meter will be described.

Prior to the measurement of the axle load, the output end of the filter 7b of the processing unit 7 is connected to the display device 4 by a cable 8 with a connector, and the strain measuring device 3 is connected between the axial force sensor 2 and the display device 4.

As a result, the output of the axial force sensor 2 is amplified by the amplifier 3a of the strain measuring device 3, the high frequency component is removed by the filter 3b, and is input to the display device 4 such as a pen recorder. Recorded and displayed by.

In this state, the output of the detecting device 5 is
Is input to the conditioner 7a of the processing unit 7 through the signal processor, where signal processing such as waveform shaping processing and level adjustment is performed.
After the high frequency component is similarly removed by the filter 7b, the high frequency component is input to the display device 4 via the cable 8, and the display device 4
Recorded and displayed by.

Therefore, the output of the axial force sensor 2 recorded and displayed on the display device 4 is used as reference data (or reference data) for confirming the accuracy and responsiveness of the detection device 5 and the processing section 7. You can do it.

At the same time, the output of the detection device 5 is digitized by the A / D converter 7c after passing through the conditioner 7a and the filter 7b, and can be simultaneously recorded in a recording device (not shown).

Next, a more specific method of measuring the axial load by the axial force sensor 2 will be described. In this case, first, the weight loaded on the loading platform of the axle load test vehicle 1 is set to 0t (in this case, because of its own weight, the weight is moved to a position where the weight is not loaded on the drive shaft), and the amplifier 3a of the strain measuring instrument 3 is automatically balanced. A push button switch (not shown) is pressed to balance the axial force sensor 2 (Wheatstone bridge).

Next, the light spot displayed on the pen oscilloscope as the display device 4 is set to "0.0" (or "0.4") on the scale, and the position adjustment knob and the fine knob (both are attached to the pen oscilloscope). (Not shown) to adjust.

Next, after setting the load of the axle load test vehicle 1 to 16 t, the voltage sensitivity knob (not shown) of the amplifier attached to the display device 4 was adjusted to 0.5 V, and the range knob of the strain gauge 3 was adjusted. (Not shown) and the gain knob are adjusted to 0.4 (or 0.8) on the scale of the display device 4. At this time, the scale becomes 0.2 t on the recording paper of the display device 4 (pen oscilloscope).

Next, the weight is adjusted to the load set value of the running load test of the axle load test vehicle 1. That is, the position of the weight of the axle test vehicle 1 is moved so as to match the running load set value.

Next, the recording paper feed speed of the display device 4 is set to 20.
Set the memory dial (not shown) to 200 ms to get 0 ms / DIV (200 ms at 100 mm).

Next, the axle load test vehicle 1 was run at a predetermined speed, and the detection device 5 was seen directly below when the recording paper running start switch (not shown) was viewed from the driver's seat of the axle load test vehicle 1. Press at the time. Then, even if the traveling of the axle load test vehicle 1 ends, the recording paper is not stopped until all the recording data is recorded.

Next, a description will be given of a recording waveform obtained by each of the above measurements. The recording data of the axial force sensor 2 is obtained by averaging the left and right wheel loads, and no change in the axial load is output by rolling. Since the position of the light spot at 8t (tare) on the pen writing oscilloscope is adjusted to "0.0", if the axle load test vehicle 1 runs as it is, a change in axle load during running is recorded.

If the analog output of the processing unit 7, that is, the output of the filter 7b is set to the same condition as the amplitude / load of the axial force sensor 2 on the recording paper, the results are as shown in FIGS.

FIGS. 5, 6, and 7 show the output waveform 2a of the axial force sensor 2 and the output waveform 5a of the detection device 5 when the shaft weights are 8t, 12t, and 16t, respectively. 5, as can be seen from FIGS. 6 and 7, the output waveform 2a of the axial force sensor 2 and the output waveform 5a of the detection device 5 match well.

At this time, the change in the axial force when the axle load test vehicle 1 on the loading plate passes through the place where the detecting device 5 is located is determined by the axle load 8
The time t is 2.3t, the load 12t is 3.4t, and the load 16t is 2.5t.

When the road surface is flat, the recording waveform of the output of the axial force sensor 2 changes with substantially the same amplitude in the vertical direction with respect to the 8t reference line.

Next, a description will be given of a method of discriminating the condition of the road surface from recording the output of the axial force sensor 2.

[0067] In FIG. 8, 2a is the output waveform of the force sensor 2 2b ₁ and 2b ₂ are each detector 5
FIG.

[0068] Of this, 2b _1, the output waveform when the front wheels of the axle load test vehicle 1 is superimposed on the detection device 5, 2b ₂ is aboard rear wheels serving drive wheel axis force sensor 2 is arranged FIG.

As can be seen from FIG. 8, when the rear wheel reaches a position slightly before the detection device 5, the output of the axial force sensor 2a suddenly increases. This is probably because a large dent is formed at a position before the position where the detection device 5 is installed. The position of the recess may be intervals of waveform 2b ₁ and the waveform 2b ₂ are estimated from Be for the wheelbase WB.

The depth of the recess is measured by sliding the probe as described above and measuring the distance between the bottom surface of the recess and the ruler at predetermined intervals.

As described above, the output of the axial force sensor 2 and the output of the detecting device 5 are compared, and the output in the vicinity of the detecting device 5 is equal to or more than a predetermined ratio (the allowable error) with respect to the output of the axial force sensor 2 in the steady state. If the load fluctuates (the value exceeds the range), it is assumed that the unevenness and the level difference of the road surface at the place where the loading plate is installed have exceeded the allowable state, and countermeasures such as repair and replacement are taken.

As described above, according to this embodiment, the axial force sensor 2, the strain measuring device 3, and the display device 4 are mounted on the axle load test vehicle 1, and the output signal of the axial force sensor 2 is output to the strain measuring device 3.
At the same time, the weight of the axle load test vehicle 1 is detected by the detection device 5 when the axle load test vehicle 1 is loaded on the loading plate. ,
After performing the predetermined signal processing on the detection output in the processing unit 7,
Since it is configured to record and display on the display device 4 via the cable 8, the accuracy and responsiveness of the axlemeter including the detection device 5 and the processing unit 7 can be tested.

Further, from the comparison between the output waveforms of the axial force sensor 2 and the detection device 5, the unevenness of the road surface before and after the place where the loading plate is installed,
The degree of influence on the axle load measurement due to steps and the like can be determined. Therefore, when there is a step, the depth of the rut digging of the part where the wheel passes in a predetermined range before and after the installation location of the detection device 5 is measured. In addition, it can be determined that the resin mortar formed so as to fill around the outer frame of the installation location of the detection device 5 due to the digging and the outer frame have a step. .

Therefore, by repairing them, it is possible to prevent an impact load and prevent a measurement value error from occurring.

That is, according to the above-described embodiment, the cause of the error occurrence, which has not been clarified so far, and the repair of the resin mortar, the repair of the road surface rut, the dynamic load check of the detecting device 5 and the processing It is possible to cope with a response check or the like to the dynamic load input of the unit 7 and prevent occurrence of an error.

The present invention is not limited to the above embodiment, but can be variously modified without departing from the scope of the invention.

For example, the axial force sensor 2 is not limited to being provided on the side plate of the differential gear case, but may be a type in which a strain gauge is attached to the surface of a shaft other than the drive shaft so that bending strain can be detected. .

[0078]

As described in detail above, according to the present invention,
An axle load test vehicle is provided with an axial force sensor, and the output of this axle force sensor is subjected to predetermined signal processing by a strain gauge, and then recorded and displayed on a display device mounted on the axle load test vehicle, and simultaneously loaded. The axle load of the axle load test vehicle mounted on the plate is detected by the detection device provided on the lower surface of the loading plate, the detection output is subjected to predetermined signal processing by the processing unit, and then mounted on the axle load test vehicle via a cable Since the display is configured to be displayed together with the displayed display device, the accuracy and responsiveness of the axleometer including the detection device and the processing unit can be tested or verified using the output of the axial force sensor as a reference signal.

Further, according to the present invention, it is possible to elucidate the irregularities of the road surface and the causes of measurement errors at the time of weight measurement with a stationary axle meter, which could not be elucidated until now. In addition, it is possible to provide a test device for inspecting a stationary axleometer capable of taking measures such as repairing a road rut, and reducing the occurrence of errors as much as possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an entire configuration of an embodiment of a test device for checking a stationary axle meter according to the present invention.

FIG. 2 is a plan view of an axial force sensor attached to a side plate of a differential gear case of the axle load test vehicle in the embodiment.

FIG. 3 is a sectional view of the axial force sensor shown in FIG. 2;

FIG. 4 is a characteristic diagram showing a result of simultaneously calibrating and recording the output of the axial force sensor and the output of the detection device according to the present invention.

FIG. 5 is a waveform diagram showing both output waveforms of the axial force sensor and the detection device when the weight of the axle load test vehicle is set to 8t in the embodiment.

FIG. 6 is a waveform diagram similar to FIG. 5 when the weight of the axle load test vehicle is 12t.

FIG. 7 is a waveform diagram similar to FIG. 5 when the weight of the axle test vehicle is 16t.

FIG. 8 is a waveform diagram showing changes in waveforms of both outputs of the axial force sensor and the detecting device in the embodiment shown in FIG. 1 with respect to a reference line at an axial load of 8t.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Axle load test vehicle 2 Axial force sensor 3 Strain measuring device 3a Amplifier 3b Filter 4 Display device 5 Detection device 6 Connection box 7 Processing unit 7a Conditioner 7b Filter 7c A / D converter 8 Cable

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01G 19/02-19/03 G01G 19/08-19/12 G01G 23/01

Claims (1)

(57) [Claims] 1. An axial force sensor attached to an axle of an axle load test vehicle, for detecting a strain generated on the axle corresponding to the axle load of the axle load test vehicle, and detecting a high frequency component from an output of the axle force sensor. A strain measuring device that outputs a removed signal, and an axle load detection device that is installed in a traveling path and detects axle load received from the wheel when the wheel of the axle test vehicle is mounted on a loading plate, A processing unit that is disposed near the axle load detection device and performs a predetermined process of the output of the axle load detection device; and simultaneously records an output of the strain measuring device mounted on the axle load test vehicle and an output of the processing unit. And a transmission means connected between the recording apparatus and the output end of the processing section for transmitting the output of the processing section to the recording apparatus. Testing equipment.