JP4388186B2 - On-vehicle weighing instrument calibration method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a calibration method for an on-vehicle measuring instrument that measures the weight of a liquefied gas or the like stored in a tank (container) such as a tank truck.
[0002]
[Prior art]
The applicant of the present invention has firstly described a vehicle body equipped with a container for containing a transported object for the purpose of providing an on-vehicle measuring instrument capable of maintaining high weighing accuracy and sufficiently ensuring safety during traveling of the vehicle. A tightening device that fixes the frame and the container to each other, and an elevating device that raises and lowers the container are provided, and during weighing, the fixing of the vehicle body frame and the container by the tightening device is released, and the container is moved by the elevating device. A vehicle-mounted measuring instrument was proposed in which the weight of the above-mentioned load cell is measured by summing up the output values of each load cell (Japanese Patent Application No. 12-24796). .
[0003]
In the on-vehicle weighing instrument having such a configuration, the following method can be considered as a calibration or calibration method of the on-vehicle weighing instrument for examining the relationship between the output of the load cell and the actual weight of the object to be weighed.
[0004]
For example, a method is conceivable in which, for example, a predetermined weight of water is placed in the container and the output of the load cell at this time is examined. However, in such a method, it may be very dangerous if any water remains in the container. Therefore, a strict management system for containers after calibration is required, which is not suitable for the actual situation.
[0005]
As another method, a method of carrying out calibration or calibration of an on-vehicle measuring instrument by loading a weight (weight) on a base installed on the upper part of the container is conceivable, but a special structure for fixing the base to the container. The container may be damaged due to excessive load applied from the top of the container, and the labor to load a large number of weights at a height of 2 meters or more is tremendous and dangerous. There's a problem.
[0006]
In general, as a calibration method for weighing instruments, testing with a weight is the most reliable and easy to carry out. However, in the calibration of in-vehicle weighing machines installed in tank trucks, tanks (containers) ), There is no base part on which a weight is placed, so there is currently no method for performing a calibration work for such an on-vehicle measuring instrument safely and simply.
[0007]
[Problems to be solved by the invention]
This invention is made in view of the above-mentioned problem, and makes it a subject to provide the calibration method of the vehicle-mounted measuring device which can perform a calibration operation | work safely and simply.
[0008]
[Means for Solving the Problems]
The above problem is a calibration method for an on-vehicle measuring instrument that measures the weight of a transported object by interposing a plurality of load cells between a container for storing the transported object and a vehicle body frame. The sling material is suspended, and the plurality of sling materials support the platform substantially horizontally at the lower position of the body frame so that both ends protrude outwardly on both sides of the vehicle. This is solved by a calibration method for an on-vehicle measuring instrument, in which a weight of a predetermined weight is placed and the relationship between the output of the load cell and the weight of the weight is examined.
[0009]
That is, in the calibration method according to one aspect of the present invention , when performing calibration of the on-vehicle weighing instrument, a load of a predetermined weight is applied to the container, and the output of the load cell and the weight of the loaded weight at this time are applied. It is characterized in that the weight is loaded in the form as described above on the container, and thus the calibration work of the on-vehicle measuring instrument can be performed safely and easily. Like to do.
[0010]
In the present invention , the weight is placed on the above-mentioned table, and the plurality of sling materials are used to place the above-mentioned table substantially horizontally at the lower position of the body frame so that both ends of the table protrude outwardly on both sides of the vehicle. The weight is placed on both ends of the stage. In this case, on each of the left and right sides of the container, one end of the sling material is fixed to the front side of the container and the other end is fixed to the rear side of the container, and the above-mentioned table is supported between them. A method of fixing the lower ends of a plurality of sling members suspended from the side and the rear side to the above-described table and supporting the table is possible.
[0011]
Here, if to support on the platform to form a gap of a predetermined size between the lower surface and the upper, wherein the upper surface of the table top SL body frame, to prevent excessive tilting of the upper the platform The weight can be stably loaded.
[0012]
In order to solve the above-described problems , the on-vehicle weighing instrument calibration method according to another embodiment of the present invention includes a plurality of load cells interposed between a container for accommodating a material to be conveyed and a vehicle body frame. An on-vehicle weighing instrument weighing method for weighing an object, wherein a plurality of beam members are substantially aligned with the container along the axial direction of the container so that both ends of the beam project outwardly on both sides of the vehicle. It is suspended horizontally, and a weight of a predetermined weight is placed on each of both ends of these beam materials via a platform extending in the axial direction, and the relationship between the output of the load cell and the weight of the weight is examined. Yes.
[0013]
As a form of suspending each beam member from the container , each beam member can be suspended through a pair of sling members having one end hung on a bracket fixed to the bottom outer wall of the container . Further, each beam member may be suspended by being suspended at both ends of a sling member hung on the container across the upper part of the container. The above-described effects can be obtained by any method.
[0014]
In particular, according to the present invention, a plurality of load cells are attached to the vehicle body frame side or the container side, and the container is lifted from the vehicle body frame from a state where the container is supported by the vehicle body frame. This is preferably implemented for an in-vehicle weighing instrument that switches to a state that is supported by the load cell and measures the transported material in the container, and in this weighing state, the calibration operation of the in-vehicle weighing instrument is performed.
[0015]
On the other hand, placing the vehicles on the calibration stand, between the container and the calibration stage, a load detecting for detecting a tensile load by the load application device and the load application device applying a tensile load in a vertical direction with respect to the container It is also possible to check the relationship between the output of the load cell and the output of the load detector.
[0016]
That is, instead of the above-described calibration using the weight, the on-vehicle weighing instrument is calibrated using a load applying device such as a hydraulic cylinder or a winch . Since the reaction force of the upper Symbol load application device is made to act on the calibration stand vehicle rests will be the reaction force is supported by the total weight of the vehicle, any need for fixing means of the reaction force against the ground or foundation Therefore, it is possible to easily perform the calibration work.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0018]
1 to 4 show a first embodiment of the present invention. In the figure, a tank (container) 3 filled with, for example, liquefied gas is mounted on a vehicle body frame 9 behind the driver seat 2 of the tank truck 1. The tank lorry 1 is provided with weighing units 4 between the front wheel FW and the rear wheel RW and immediately after the rear wheel RW. Each weighing unit 4 is operated by a driver using a control panel 5 and an operation lever 6 in an operation unit 7 installed on the body frame 9 via a vibration isolation member 8.
[0019]
Referring to FIG. 5, a hydraulic cylinder 42 is fixed to the vehicle body frame 9 via a support member 23, and a load cell 40 is arranged at a drive rod end of the hydraulic cylinder 42 via a load cell fixing block 41. The load cell 40 is configured to move up and down by driving the hydraulic cylinder 42. The illustrated state shows a state in which the load cell 40 is in the raised position.
[0020]
A subframe 10 having an inverted trapezoidal cross section extending in the axial direction of the tank 3 is fixed to the bottom outer wall of the tank 3. When the load cell 40 is lowered, the subframe 10 and the vehicle body frame 9 come into contact with each other via the plate material 19, and the tank 3 is supported by the vehicle body frame 9. A load cell receiver 37 facing the load cell 40 is fixed to the subframe 10 via the support member 18, and when the load cell 40 is raised by driving the hydraulic cylinder 42, the load cell 40 abuts on the load cell receiver 37, As shown in FIG. 5, the tank 3 is configured to rise by a predetermined height relative to the vehicle body frame 9 by further raising the cylinder 42. At this time, the tank 3 is supported by the load cell 40 of each weighing unit 4, and the transported material in the tank 3 is obtained from the total output of the load cell 40 of each weighing unit 4.
[0021]
The weighing unit 4 is configured as described above, and is entirely covered with the cover 32. Although not shown, a tightening device for firmly fixing the tank 3 and the vehicle body frame 9 when not being measured is disposed on the support plate 23 on the front side (back side of the drawing) of the hydraulic cylinder 42 in FIG. The explanation is omitted.
[0022]
Next, the calibration (or calibration) operation of the on-vehicle weighing instrument for examining the relationship between the measured value by the weighing unit 4 configured as described above and the actual weight of the object to be weighed will be described. In the present embodiment, the on-vehicle weighing instrument is calibrated using a weight (weight), and a table on which the weight is placed is installed as follows.
[0023]
First, the load cell 40 of each measuring unit 4 is lowered, and the tank 3 is supported by the body frame 9. One end of a sling material 47 such as a wire rope or a chain is engaged with a hole 45 of a bracket 44 provided integrally with the subframe 10 via a known coupling member 46 such as a hook or a shackle. The other end is locked to the eye portion of an eyebolt 49 fixed to the beam member 50 via a coupling member 48 having the same configuration as the coupling member 46. The sling material 47 may be a steel bar having a joint at the end. As described above, the beam member 50 is suspended from the tank 3 at a predetermined height H from the ground 51.
[0024]
A plurality of beam members 50 are suspended along the axial direction of the tank 3, and in this embodiment, between the front wheel FW and the rear wheel RW, immediately before the front rear wheel RW and of the rear rear wheel RW. Three pieces are suspended from the tank 3 in the same manner as described above. Each beam member 50 extends below the body frame 9 in the direction perpendicular to the axis of the tank 3, and each beam member 50 has both ends 50 a and 50 a protruding outward from the side of the tank truck 1 as shown in FIG. 3. It has a length to do.
[0025]
Next, a plate-like mounting base 51 extending in the axial direction of the tank 3 is placed on each of both ends 50 a and 50 a of each beam member 50. That is, the platform 51 is supported by the three beam members 50. No fixing means is required between the beam member 50 and the mounting base 51, and the mounting base 51 is simply placed on the beam member 50 from the viewpoint of improving workability.
[0026]
As described above, the installation of the platform 51 on which the weight is placed is completed. Then, the operation unit 7 is operated, the load cell 40 is raised by driving the hydraulic cylinder 42 of each measuring unit 4, and the tank 3 is raised from the vehicle body frame 9 by a predetermined distance. At this time, the weight of the beam member 50 and the mounting base 51 acts on the tank 3, and the total weight of these members is detected from the output of each load cell. In the present embodiment, the weights of all the members for calibration are separately measured in advance as a tare, zero point correction is performed at this point, the weight value of a known weight to be loaded later, and the output value of the on-vehicle weighing instrument Measure the error from
[0027]
Subsequently, the on-vehicle weighing instrument is calibrated by the method described below while loading a predetermined number of weights on the mounting table 51.
[0028]
In order to apply a load equally to each weighing unit 4 on each platform 51, 51, a weight 52 is placed evenly. In the present embodiment, first, the weights 52 are placed on the entire surface of the platform 51 in a row with a predetermined interval (for example, an interval corresponding to the width of one weight), and the weight 52 at this time The error is measured from the total value of the total weight and the output of all the weighing units 4. Subsequently, another weight 52 is placed between the weights 52 on the mounting table 51, and the weight 52 is further spread on the mounting table 51. And an error is measured from the total value of the total weight of the weight 52 at this time, and the output of all the measurement parts 4. FIG. In the same manner, two layers of weights 52 are spread on each mounting base 51, and errors are sequentially measured from the total weight of the weights 52 and the total output of all the weighing units 4. If the error is within the allowable range, it is assumed to be normal, and if the error exceeds the allowable range, the output value is corrected.
[0029]
In this embodiment, the tank lorry 1 having a tank capacity of 8 tons (t) is used, and a total of 200 weights 52 of 20 kilograms are loaded on each platform 51.
[0030]
As described above, according to the present embodiment, the beam member 50 can be easily attached to and detached from the tank 3, and the weight of the weight can be applied to the tank 3 by a simple method. Carrying out the calibration or calibration of the on-vehicle measuring instrument.
[0031]
FIG. 6 shows a second embodiment of the present invention. In the figure, portions corresponding to those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.
[0032]
This embodiment is different from the first embodiment described above in the method of suspending the beam member 50 from the tank 3. That is, in the present embodiment, the beam member 50 is engaged with both ends of a wide sling material 47 made of a chemical fiber such as nylon (trade name) straddling the tank 3 across the upper portion of the tank 3 and illustrated. Thus, the beam member 50 is suspended from the tank 3. The reason why the sling material 47 is made of a wide chemical fiber as described above is to suppress damage to the tank 3 as much as possible. Also according to the present embodiment, the same effect as that of the first embodiment described above can be obtained.
[0033]
7 and 8 show a third embodiment of the present invention. In the figure, portions corresponding to those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.
[0034]
In the present embodiment, the ends of the pair of flexible sling members 65 and 65 are respectively engaged with the brackets 44 on the front side and the rear side of the tank 3, and the shaft of the tank 3 is moved below the body frame 9. The pallet-shaped mounting base 64 inserted in the straight direction is supported substantially horizontally by these sling members 65. As shown in FIG. 8, both ends of the mounting base 64 protrude outwardly on both sides of the vehicle, and a weight of a predetermined weight is loaded on the protruding both ends as in the first embodiment described above. That is, the present embodiment is a configuration example in which the mounting table 64 has the two functions of the beam member 50 and the mounting table 51 in the first embodiment described above.
[0035]
The method of supporting the mounting table 64 by the sling material 65 is not limited to the above-described method, and the sling material is composed of a plurality of steel bars suspended from the brackets 44 on the front side and the rear side of the tank 3, and these end portions are mounted on the mounting table. You may make it fix to 64 by fixing means, such as screwing.
[0036]
In the present embodiment, the lengths of the sling members 65 and 65 are set so that a certain gap g is formed between the upper surface of the mounting base 64 and the lower surface of the vehicle body frame 9 as clearly shown in FIG. Adjusted. The size of the gap g is such that when the weight 52 is loaded on the platform 64, the inclination of the platform 64 due to the difference in weight between the left and right is limited by the contact between the platform 64 and the vehicle body frame 9, and the loaded mass. 52 is set to a size necessary to prevent the collapse of 52. Thereby, the weight 52 can be stably loaded on the mounting table 64.
[0037]
Such a configuration is also applied to the first and second embodiments described above, and the length of the sling material 47 is formed so as to form the constant gap g between the beam material 50 and the vehicle body frame 9. May be adjusted.
[0038]
9 and 10 show a fourth embodiment of the present invention. In the figure, portions corresponding to those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.
[0039]
In the present embodiment, the tank lorry 1 is placed on the calibration table 56, and between the tank 3 and the table 56, a load applying device 54 that applies a tensile load in the vertical direction to the tank 3 and the load applying device 54. A load detector 55 that detects the tensile load is connected in series. That is, as clearly shown in FIG. 10, one end of the load detector 55 is connected to the bracket 44 of the tank 3 via the coupling member 46 and the sling material 57, and the load is connected to the other end of the load detector 55 via the sling material 58. The output end of the adding device 54 is connected, and the main body of the load adding device 54 is connected to the support fitting 61 on the calibration table 56 through the sling material 59. The support fitting 61 is movably mounted on the calibration table 56 so as to be arranged on the same vertical line as the bracket 44, but its positioning is performed by a fixed fitting 62 fixed to the calibration table 56.
[0040]
In the present embodiment, a hydraulic cylinder such as a hydraulic jack is employed as the load applying device 54, but a winch or the like can also be applied. As the load detector 55, a calibration or calibrated load cell is employed.
[0041]
The on-vehicle measuring instrument is calibrated by driving the hydraulic cylinder 42 in the calibrating unit 4 to raise the tank 3 from the vehicle body frame 9 by a predetermined distance, as shown in FIG. Is added to the tank 3 via the load detector 55, and the relationship between the output of the load detector 55 and the output of the weighing unit 4 at this time is examined. Therefore, by performing the above operation simultaneously at a plurality of locations in the tank 3, the on-vehicle weighing instrument can be easily calibrated.
[0042]
Here, in the present embodiment, since the tank lorry 1 is placed on the calibration table 56 that receives the reaction force of the tensile force by the load adding device 54, the reaction force can be supported by the vehicle weight of the tank lorry 1, and the support bracket. It is possible to support a large load up to 8t (for example, a tank capacity of a 20t chassis vehicle) without having to fix 61 or the fixing bracket 62 to the ground 60 using an anchor bolt or the like.
In this embodiment, the calibration table 56 is constituted by a single member. However, the calibration table 56 is not limited to this and may be divided into a plurality of parts and arranged below the front wheel side and rear wheel side wheels of the tank truck 1. Good.
[0043]
As mentioned above, although each embodiment of this invention was described, of course, this invention is not limited to these, A various deformation | transformation is possible based on the technical idea of this invention.
[0044]
For example, in the first embodiment described above, the number of beam members 50 suspended from the tank 3, in other words, the number of beam members 50 that support the weight 52 is three. Two or four or more may be used. Further, the hanging position of the beam member 50 is not limited to the above-described embodiments. Further, the weight and the number of weights 52 to be loaded are not limited to the above-described embodiments.
[0045]
Further, in the first embodiment described above, the weight 52 is loaded on the mounting table 51 so as to apply the load evenly to all the weighing units 4, but further, an offset load is applied to each weighing unit 4. A weight 52 may be mounted on the measuring unit 4 to measure the output characteristics of each weighing unit 4. Thereby, the load distribution of the tank 3 resulting from the inclination angle of the ground 60 and the structural characteristics of the vehicle body frame 9 can be measured, and highly accurate in-vehicle weighing taking these into consideration is possible.
[0046]
【The invention's effect】
As described above, according to the on-vehicle weighing instrument calibration method of the present invention, the weight of the weight can be easily applied to the container, and the calibration or calibration operation of the on-vehicle weighing instrument can be performed safely and easily. Can do.
[0047]
According to the second aspect of the present invention, it is possible to configure a single stage on which the weight is placed, which simplifies the calibration work, and according to the third aspect of the invention, it is stable with respect to both ends of the stage. It is possible to load a weight.
[0048]
According to the invention of claim 4, since the beam material can be easily detached from the container, and the weight of the weight can be applied to the container by a simple method. Or a calibration operation can be performed.
[0049]
According to the invention of claim 5, each beam member is suspended through a pair of sling members having one end hung on a bracket fixed to the bottom outer wall of the container. Carrying out the calibration or calibration of the on-vehicle measuring instrument.
[0050]
According to the invention of claim 6, each beam member is suspended from both ends of the sling material hung on the container across the upper part of the container, so that the beam member is suspended from the container. It is possible to easily carry out calibration or calibration work of the on-vehicle measuring instrument without requiring a special structure.
[0051]
Further, according to claim 7, the container is lifted from the vehicle body frame from a state where a plurality of load cells are attached to the vehicle body frame side or the container side, and the container is supported by the vehicle body frame. Can be suitably implemented for an on-vehicle weighing instrument that switches the state to be supported by the plurality of load cells and measures the transported goods in the container.
[0052]
According to the invention of claim 8, since the reaction force of the load applying device is applied to the calibration table on which the vehicle is mounted, the reaction force is supported by the total weight of the vehicle, and the above-mentioned against the ground or the foundation. The calibration operation can be easily performed without requiring any reaction force fixing means.
[Brief description of the drawings]
FIG. 1 is a side view of a tank truck for explaining a first embodiment of the present invention.
FIG. 2 is a plan view of the same.
FIG. 3 is a rear view of the same.
FIG. 4 is a side view showing an example of a beam material hanging manner.
FIG. 5 is an enlarged view of a main part in FIG. 3;
FIG. 6 is a rear view of a tank truck for explaining a second embodiment of the present invention.
FIG. 7 is a side view of a tank truck for explaining a third embodiment of the present invention.
FIG. 8 is an enlarged rear view of the main part.
FIG. 9 is a side view of a tank lorry for explaining a fourth embodiment of the present invention.
FIG. 10 is an enlarged rear view of the main part.
[Explanation of symbols]
1 Tank truck (vehicle)
3 Tank (container)
4 Weighing unit 9 Body frame 40 Load cell 42 Hydraulic cylinder 44 Bracket 47 Sling material 50 Beam material 51 Mounting platform 52 Weight 54 Load applying device 55 Load detector 56 Calibration table 64 Mounting platform 65 Sling material

Claims (5)

It is a calibration method for an on-vehicle measuring instrument that measures the weight of the transported object by interposing a plurality of load cells between a container for storing the transported object and a vehicle body frame,
Hanging a plurality of sling materials from the container,
The plurality of sling materials support the platform substantially horizontally at a position below the vehicle body frame so that both ends thereof protrude outward on both sides of the vehicle,
Place a weight of the specified weight on each end of the table ,
A calibration method for an on-vehicle measuring instrument, wherein a relationship between the output of the load cell and the weight of the weight is examined. The calibration method for an on-vehicle weighing instrument according to claim 1 , wherein a gap of a predetermined size is formed between the lower surface of the vehicle body frame and the upper surface of the table, and the table is supported. It is a calibration method for an on-vehicle measuring instrument that measures the weight of the transported object by interposing a plurality of load cells between a container for storing the transported object and a vehicle body frame,
A plurality of beam members are suspended substantially horizontally with respect to the container so that both ends thereof protrude outwardly on both sides of the vehicle along the axial direction of the container.
A weight of a predetermined weight is placed on each of both ends of these beam materials via a platform extending in the axial direction,
A calibration method for an on-vehicle measuring instrument, wherein a relationship between the output of the load cell and the weight of the weight is examined. The calibration method for an on-vehicle measuring instrument according to claim 3 , wherein each beam member is suspended through a pair of sling members having one end hung on a bracket fixed to the bottom outer wall of the container. The on-vehicle weighing instrument calibration method according to claim 3 , wherein the beam members are suspended from both ends of a sling material hung on the container across the upper part of the container.

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