JP3006632U - Vehicle weight measuring device - Google Patents

Abstract

(57) [Summary] [Purpose] To enable accurate load measurement without being affected by the unevenness of the ground. A load cell 2 for measuring a vehicle weight receives a load of a vehicle from above and outputs a detection signal corresponding to the load, and a support portion 22 for supporting the sensor unit from below. A curved contact structure provided at a contact point between the sensor section and the support section 22,
A curved surface contact structure portion (for example, a sphere) 23 is provided so that the load of the sensor portion is supported by the support portion at the contact portion having the curved surface contact structure. Due to the double structure of the sensor part and the support part and the interposition of the curved contact structure part between them, no matter how the unevenness of the ground below hits the support part, the load position of the sensor part above it Is always at a predetermined position corresponding to the curved surface contact structure portion, so that there is no variation in the load position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an apparatus for measuring the weight of a vehicle such as a truck, and for example, relates to a portable vehicle weight measuring apparatus which is convenient for taking out on an ordinary road for overload control and measuring the weight at any place.

[0002]

[Prior art]

 In the vehicle weight measuring device used for overload control, a portable type is used so that it can be conveniently taken out on a general road and weighed at any place. A conventionally known vehicle weight measuring device has load cells arranged at a plurality of predetermined positions under a loading table (or a top plate) which directly receives the load of the vehicle. The thickness of the loading platform is desired to be as thin as possible so that it can be carried easily, and along with this, the thickness of the load cell is also made as thin as possible.

[0003]

[Problems to be solved by the device]

 When the loading platform of the vehicle weight measuring device is placed on an open road or an appropriate vacant lot, the asphalt or concrete surface of the ground is not smooth, so that the contact from below the ground to each load cell becomes uneven. In addition, even in the individual load cells, the unevenness of the ground surface affects the load application position downward. In the load cell of the conventional vehicle weight measuring device, the downward bias of the load applying position affected by the unevenness of the ground directly becomes the bias of the load point in the load cell body, and the load is applied to the original predetermined load center position. It will not take. Therefore, there is a problem that the load detection accuracy is reduced. The present invention has been made in view of the above points, and an object of the present invention is to provide a vehicle weight measuring device that is capable of accurate load measurement without being affected by unevenness of the ground.

[0004]

[Means for Solving the Problems]

 A vehicle weight measuring device according to the present invention includes a sensor unit for receiving a load of a vehicle from above and outputting a detection signal corresponding to the load, a support unit for supporting the sensor unit from below, and the sensor unit. And a curved contact structure provided at a contact portion with the support portion, and a curved contact structure portion configured to support the load of the sensor portion by the support portion at the contact portion having the curved contact structure. It uses a load cell.

[0005]

[Action]

 The load cell used in the vehicle weight measuring apparatus according to the present invention has a double structure of a sensor part and a support part. Further, a curved contact structure part is interposed between the double structure, and The load of the sensor section is supported by the support section at the contact point. Therefore, no matter how the unevenness of the ground below hits the support located at the bottom, the load position of the sensor at the top of the support is always the predetermined one corresponding to the curved contact structure. Position, and there is no variation in the load position. Therefore, the load cell sensor is always loaded at the same load position without being affected by the unevenness of the ground on which this vehicle weight measuring device is installed.Therefore, there is no variation in load detection accuracy and the load detection accuracy is always uniform. It has an excellent effect that the vehicle weight can be measured with the accuracy of. In this case, it is preferable that the curved surface contact structure portion is provided at a position substantially corresponding to the predetermined load center position of the sensor portion because load measurement can be performed with good balance.

Further, since the curved surface contact structure is provided, the sensor portion can be smoothly tilted to a certain angle with respect to the support portion, which also allows the load position of the sensor portion to always correspond to the curved surface contact structure portion. Can be maintained in place. If the curved contact structure is a structure in which a rotatable sphere or rotating body is interposed between the sensor unit and the support unit, the load moment due to the wheel rotation driving force of the vehicle kicking the top plate is absorbed. be able to.

[0007]

【Example】

 An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is an overall external view of an embodiment of a vehicle weight measuring apparatus according to the present invention, in which load cells are set at a plurality of predetermined places under a top plate (loading table) 1 for directly receiving the load of the vehicle. 2 are arranged. Needless to say, the number of load cells 2 arranged on one top plate 1 and the arrangement pattern thereof are not limited to those shown in the drawings. The slope plates 3 and 4 which are detachably installed on both sides of the top plate 1 are for guiding the wheels 5 of the vehicle from the ground 6 to the top plate 1. As shown in FIG. 1, it is well known in the art that the wheel 5 on one side is mounted, and a similar device for mounting the wheel on the other side is used in actual vehicle weight measurement. Is.

Although the overall view of FIG. 1 itself is a conventionally known configuration, the present invention is characterized by the structure of the load cell 2 used therein. This point will be explained with reference to FIG. 2. FIG. 2 is a schematic vertical sectional view of a portion of one load cell 2. The load cell 2 receives a load of the vehicle from above and outputs a detection signal corresponding to the load, a support portion 22 for supporting the sensor portion 21 from below, and the sensor portion 21. The curved contact structure is provided at a contact point with the support section 22, and the curved contact structure section 23 supports the load of the sensor section 21 by the support section 22 at the contact point having the curved contact structure. ing. In the case of the embodiment of FIG. 2, the curved surface contact structure portion 23 is formed of a sphere, and is interposed between the concave curved surface portion on the sensor portion 21 side and the concave curved surface portion on the support portion 22 side and is rotatable. .

The sensor portion 21 has a main body portion 21a made of a rigid body for receiving a load, and a strain gauge (not shown) that detects a strain of the main body portion and outputs a detection signal. A well-known strain gauge and a circuit related thereto may be used as appropriate, and thus no particular details are shown. Further, the shape and structure of the main body portion 21a and the arrangement of the storage elements may be arbitrarily selected, and thus the details thereof are not shown. The sensor portion 21 and the support portion 22 are loosely coupled by appropriate means (not shown) to the extent that they are not separated from each other. For example, they are coupled via a spring or the like so that the space between the two can be displaced to some extent flexibly. The load cell 2 configured as described above is attached at a predetermined position on the lower side of the top plate 1 through an appropriate attachment means (not shown).

The operation will be described. When the vehicle is placed on the top plate 1, the load applied to the top plate 1 is transmitted to the sensor portion 21 of the load cell 2, and the load applied to the sensor portion 21 is curved surface contact structure portion 23. It is received by the support portion 22 through the point of. At this time, no matter what the unevenness of the ground 6 below the support 22 is (that is, where the load point below the support 22 is, that is, the contact point between the ground 6 and the support 22). However, the load position of the sensor portion 21 on the upper surface is at the curved contact structure portion 23 and does not change. Therefore, the load position of the sensor portion 21 is always a predetermined position corresponding to the curved surface contact structure portion 23, and the load position does not vary. Therefore, the sensor unit 21 of the load cell 2 always receives the load at the same load position without being affected by the unevenness of the ground 6 on which the vehicle weight measuring device is installed, so that the load detection accuracy does not vary. The excellent effect that the vehicle weight can always be measured with uniform accuracy is achieved. Further, since the contact structure is a curved surface (especially spherical surface), the sensor portion 21 can be slanted at a certain angle with respect to the support portion 22, which also causes a slight inclination of the ground 6. The load position of the sensor unit 21 can be always maintained at a predetermined position corresponding to the curved surface contact structure unit 23 without being affected.

In the illustrated example, the curved surface contact structure portion, that is, the spherical body 23 is provided at a position corresponding to substantially the center of the sensor portion 21. This is preferable because the load can always be received at the predetermined load center position of the sensor unit 21 and the load can be measured with good balance. However, it is not limited to this. Further, since the curved surface contact structure portion 23 is a rotatable sphere, it is possible to absorb the load moment due to the wheel rotation driving force of the vehicle kicking the top plate 1, and it is possible to perform more accurate weight measurement. . However, the curved surface contact structure portion 23 is not limited to such a rotatable structure.

Next, a modified example of the curved surface contact structure portion 23 will be described. In the example of FIG. 3, the curved surface contact structure portion is a spherical surface portion 21b, 22b partially formed at at least one of the sensor portion 21 and the support portion 22 at the contact portion between the sensor portion 21 and the support portion 22. It is configured to include. The spherical surface portion 21b is a hemispherical concave portion formed below the sensor portion 21, and the spherical surface portion 22b is a hemispherical convex portion formed above the support portion 22. This hemisphere does not have to be a geometrically exact hemisphere; it just needs to be rounded. Further, the relationship of the unevenness of the hemispherical surface between the sensor portion 21 and the support portion 22 may be opposite to that shown in FIG. Although not particularly shown, as another example of the curved surface contact structure portion, a cylindrical curved surface contact structure may be used, but the accuracy will be lower than that of the spherical surface contact structure.

[0013]

[Effect of device]

 As described above, according to the present invention, the sensor portion and the support portion are formed in a double structure, and the curved contact structure portion is interposed between the double structures, and the contact portion is formed in the curved contact structure. Since the load of the sensor section is supported by the support section, no matter how the unevenness of the ground beneath it hits the support section located at the bottom, the load position of the sensor section above it is , It will always be in a fixed position corresponding to the curved surface contact structure, and there will be no variation in the load position. Therefore, the sensor unit of the load cell always receives the load at the same load position without being affected by the unevenness of the ground on which the vehicle weight measuring device of the present invention is installed, which causes variations in load detection accuracy. In addition, it has an excellent effect that the vehicle weight can always be measured with uniform accuracy. In addition, the curved (especially spherical) contact structure allows the sensor part to incline smoothly to a certain angle with respect to the support part, which also allows the load position of the sensor part to always correspond to the curved contact structure part. Can be maintained in place. Further, if the curved contact structure has a structure in which a rotatable sphere or a rotating body is interposed between the sensor part and the support part, it is possible to absorb the load moment due to the wheel rotation driving force of the vehicle kicking the top plate. .

[Brief description of drawings]

FIG. 1 is an overall external view of an embodiment of a vehicle weight measuring device according to the present invention.

FIG. 2 is a schematic vertical sectional view showing an embodiment of a load cell used in the vehicle weight measuring apparatus according to the present invention.

FIG. 3 is a schematic vertical sectional view showing another embodiment of the load cell.

[Explanation of symbols]

 1 Top Plate (Loading Platform) 2 Load Cell 21 Sensor Part 21a Sensor Main Part 22 Support Part 23 Curved Contact Structure Part (Sphere) 21b, 22b Spherical Part 3,4 Slope Plate 5 Wheel 6 Ground

Claims (7)

[Scope of utility model registration request] 1. A sensor section for receiving a load of a vehicle from above and outputting a detection signal according to the load, a support section for supporting the sensor section from below, and a contact between the sensor section and the support section. A vehicle using a load cell having a curved surface contact structure provided at a location, and a curved surface contact structure portion configured to support the load of the sensor portion by the support portion at the contact portion having the curved surface contact structure. Weight measuring device. 2. The vehicle weight measuring device according to claim 1, wherein the curved surface contact structure portion is provided at a position substantially corresponding to a predetermined load center position of the sensor portion. 3. The vehicle weight measuring device according to claim 1, wherein the curved surface contact structure portion has a spherical contact structure. 4. The vehicle weight measuring device according to claim 1, wherein the curved surface contact structure portion includes a rotatable sphere interposed between the sensor portion and the support portion. 5. The curved surface contact structure portion includes a spherical surface portion partially formed in at least one of the sensor portion and the support portion at the contact portion.
The vehicle weight measuring device according to. 6. The vehicle weight according to claim 1, wherein the sensor portion has a main body portion that receives a load, and a strain gauge means that detects a strain of the main body portion and outputs a detection signal. measuring device. 7. The vehicle weight measuring device according to claim 1, wherein a plurality of the load cells are arranged, a top plate is installed on the load cells, and a load of the vehicle is received from the top plate.