JP2020034364A - Vehicle weighing device - Google Patents

Abstract

To provide a vehicle weighing device which is capable of being installed on the unpaved ground and making the entire device compact and low-profile.SOLUTION: A vehicle weighing device 2 includes: supporting members 4, 4 arranged on both sides of the ground 3; a plurality of suspension measurement units 5,5 ... suspended from each supporting member; and a loading platform 6 suspended via a plurality of suspension measurement units 5,5 .... The suspension measurement unit 5 includes lifting means 31 for lifting a suspension member 30. The suspension member 30 is lowered and a vehicle 1 is made to enter the loading platform 6 in a state of grounding the loading platform 6.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle weighing device for measuring a vehicle weight including a weight of a load loaded on a vehicle such as a dump truck.

  In the transportation by vehicles such as earth and sand transportation by dump trucks, since the accidents due to overloading and damage to roads have become a social problem, it is necessary to strictly control the weight of the load.

  For this reason, in large dump trucks, etc., it is mandatory to install a weighing device that automatically weighs the load on the vehicle itself, but the weighing device installed in this type of vehicle has low accuracy and can not be used very much That was the current situation.

  Therefore, at construction sites that require transportation of earth and sand, vehicle weighing devices such as truck scales are installed at the site, and the loading weight of vehicles such as dump trucks is measured by the vehicle measuring device when loading at the construction site. In many cases, they are strictly managed.

  For example, as shown in FIG. 6, a vehicle weighing device such as a truck scale arranges a beam (not shown) in a reinforced concrete pit 101 formed on the ground 100 and, as shown in FIG. In general, a stationary type in which a steel table 104 on which a dump truck 103 is placed is supported via load cells 102, 102 installed in a vehicle is widely known (for example, see Patent Document 1).

  On the other hand, as a vehicle weighing device of this type such as a truck scale, a portable weighing device that can be installed on a flat ground surface is also known (for example, see Patent Document 2).

  This portable vehicle weighing device includes a support frame supported via a load cell disposed on a flat ground surface, a steel table supported by the support frame, and a slope disposed before and after the steel table. The vehicle is guided on a steel table through a slope, and the load of the vehicle placed on the steel table is measured by a load cell.

JP 2006-177722 A JP-A-10-148565

  However, in the conventional stationary measuring device for vehicles as described above, it is necessary to secure the reaction force of the load cell for measuring the load, and a stable pit made of reinforced concrete is provided. There was a problem that was.

  In addition, the conventional stationary type vehicle weighing device needs to support a heavy steel stand and a dump truck, so the beam installed in the pit is enlarged, and the cost is increased accordingly. there were.

  On the other hand, conventional portable weighing devices for vehicles must be installed on a flat place paved with concrete, etc., because land subsidence cannot be tolerated, and can be installed on unpaved parts such as construction sites. There was a problem that it was not possible.

  In addition, the conventional portable weighing device for a vehicle has a structure in which a steel table is supported by a load cell, so that the height of the entire device is increased, and accordingly, a support frame and a slope for guiding the vehicle to the steel table are increased. However, there is a problem that the size of the apparatus is increased and labor is required for transportation and installation.

  Furthermore, the conventional vehicle weighing device, whether stationary or portable, has a structure in which a steel table is supported on a load cell. Also, there is a problem that a large dynamic load acts and causes a measurement error.

  Furthermore, the conventional vehicle weighing device requires a load cell having a large capacity so as to allow a dynamic load when a vehicle such as a dump truck is loaded on a steel table, and has a strong structure that supports the load cell accordingly. However, there is a problem that the accuracy of the load cell must be reduced and the size of the apparatus must be increased.

  In view of such a conventional problem, the present invention has been made to provide a vehicle weighing device that can be installed on unpaved ground and that can reduce the size and height of the entire device.

  The feature of the invention according to claim 1 for solving the conventional problem as described above is that in a vehicle weighing device for measuring the weight of a vehicle, supporting members disposed on both sides of the ground, A plurality of suspension-type measuring units suspended from the member, and a loading platform supported by the two supporting members via the plurality of suspension-type measurement units, the suspension-type measurement unit, A suspension member for supporting the carrier, load measuring means for measuring a load acting on the suspension member, and elevating means for elevating the suspension member, lowering the suspension member, That is, the vehicle is allowed to enter with the cargo bed landing.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, each of the suspension-type measuring units includes a level adjusting unit that adjusts a level of the load measuring unit.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the loading platform includes a plurality of support beam members oriented in a direction between supporting members whose both ends are supported by the suspension-type measuring unit. And a load plate spanned over the support beam.

  The vehicle weighing device according to the present invention has the configuration described in claim 1, so that the entire device can be reduced in height and reduced in size, and accordingly, the slope for guiding the vehicle to the loading platform can be reduced in size. It has become. The small size and low profile make it easy to carry. Further, as the vehicle weighing device, a small-capacity device can be adopted in which the load measuring means is hardly affected by an impact and a dynamic load accompanying the movement of the vehicle.

  Also, in the present invention, by providing the configuration according to claim 2, it is possible to cope with the settlement of the ground, it is not necessary to use a concrete foundation, and it can be installed even on unpaved ground. it can.

  Furthermore, in the present invention, by providing the configuration according to the third aspect, it is possible to reduce the capacity of the suspension-type measurement unit by multi-point support by the suspension-type measurement unit, thereby improving the measurement accuracy. Can be achieved.

It is a front view showing an example of the measuring device for vehicles concerning the present invention. It is a side view same as the above. It is a top view same as the above. FIG. 2 is an enlarged front view showing a suspension-type measurement unit in FIG. 1, showing a state when the vehicle is moving. It is an enlarged front view which shows the state at the time of vehicle weight measurement same as the above. It is sectional drawing which shows an example of the conventional measuring device for vehicles.

  Next, an embodiment of the vehicle weighing device according to the present invention will be described based on the embodiment shown in FIGS. In the drawings, reference numeral 1 denotes a vehicle such as a dump truck, reference numeral 2 denotes a vehicle weighing device, and reference numeral 3 denotes a ground on which the vehicle weighing device 2 is installed.

  The vehicle weighing device 2 includes support members 4, 4 arranged on both sides of the ground 3, a plurality of suspension-type measurement units 5, 5. The loading platform 6 supported by the two supporting members 4, 4 via the plurality of suspension-type measuring units 5, 5,... And the loading platform based on the loads measured by the respective suspension-type measuring units 5, 5,. And a weight calculating means for calculating the weight of the vehicle 1 on the vehicle 6 so as to measure the weight of the vehicle 1 that has entered the loading platform 6.

  Further, the vehicle weighing device 2 includes slopes 7, 7 respectively before and after in the vehicle traveling direction, and the vehicle 1 can be guided on the loading platform 6 through the slopes 7, 7. Incidentally, the slope 7 may be installed on either the front side or the rear side depending on the situation.

  The vehicle weighing device 2 may be placed on the surface of the ground 3 having a certain degree of flatness, and may be installed on the unpaved ground 3.

  Each of the supporting members 4 includes a flat plate-shaped substrate portion 10, a side plate portion 11 rising from a side edge of the substrate portion 10, and a support plate portion 12 projecting from an upper edge of the side plate portion 11. The cross section of the shape or the inverted U shape forms a C-shaped channel material continuous in the horizontal direction.

  The two supporting members 4, 4 are arranged on both sides of the ground 3 with their opening sides facing each other, and the suspension type measuring units 5, 5,. A plurality of loading tables 6 are provided between the supporting members 4 and 4 so as to be vertically movable via the suspension type measuring units 5 and 5.

  The loading table 6 includes a plurality of parallel supporting beam members directed toward the direction between the supporting members 4, 4 whose both ends are supported by the suspension-type measuring units 5, 5,. , And loading plates 21, 21 laid over the supporting beam members 20, 20 in the traveling direction of the vehicle 1, and the loading plates 21, 21 are supported by the respective supporting beam members 20, 20. I have come to support it.

  The supporting beam members 20, 20,... Are made of H-section steel or the like, and both ends thereof are arranged between the substrate part 10 and the supporting plate part 12 of the supporting members 4, 4 so as to be vertically movable.

  The lower ends of the suspension-type measuring units 5, 5,... Are connected to the upper surfaces of the supporting beam members 20, 20,. , 5...

  Each of the suspension-type measurement units 5, 5,... Includes a suspension member 30 that supports the loading platform 6, a load measurement unit 31 that measures a load acting on the suspension member 30, and an elevating unit that moves the suspension member 30 up and down. 32, and a level adjusting means 33 for adjusting the level of the load measuring means 31. The suspension member 30 is supported by the supporting plate 30 via the level adjusting means 33, the load measuring means 31, and the elevating means 32 assembled in a predetermined arrangement. It is suspended downward from the part 12.

  The level adjusting means 33 includes a movable tube portion 34 inserted into the insertion hole 13 opened in the support plate portion 12, a support piece 35 fitted outside the movable tube portion 34 so as to be relatively movable in the axial direction. And a bearing 36 interposed between the supporting piece 35 and the supporting plate 12 so that the movable tube 34 is supported by the supporting plate 12 via the bearing 36 and the supporting piece 35. Has become.

  The movable tube portion 34 is formed in a tubular shape having male threads on the outer surface and open at both ends, and is inserted into the insertion hole 13 with the axial direction facing up and down.

  The support piece 35 is formed in a hollow disk shape having a female screw at the center thereof to be screwed with the male screw of the movable pipe 34, and the movable pipe 34 and the support piece 35 are movable with each other by rotating. The tube 34 is relatively moved in the axial direction. Reference numeral 35a in the figure is a handle for rotating the support piece 35.

  The support piece 35 is formed to have a larger diameter than the insertion hole 13 formed in the support plate 12, and is rotatably supported by the edge of the insertion hole 13 via the bearing 36. I have.

  The load measuring means 31 is constituted by a compression type load cell having a center hole in the center, is mounted concentrically on the upper surface of the movable tube portion 34 via a washer 37, and the elevating means 32 is supported on the upper surface.

  The lifting / lowering means 32 is constituted by a center-hole type jack having a through hole in the center, a jack body 32a mounted on the upper surface of the load measuring means 31, and a cylindrical piston rod 32b vertically moving with respect to the jack body 32a. The upper end of the suspension member 30 is supported on the upper end of the piston rod 32b via the anchor member 38.

  The hydraulic pressure of the lifting / lowering means 32 of each suspension type measuring unit 5 is controlled synchronously by a control device (not shown), and the piston rod 32b can be moved at a constant displacement.

  The suspension member 30 is formed in a rod shape such as a steel rod, and has an upper end penetrating through the insertion hole 13 of the support plate, the bearing 36, the movable pipe portion 34, the load measuring means 31, and the elevating means 32, and an upper end thereof being an anchor. It is supported on the upper end of the piston rod 32b of the elevating means 32 via a member 38.

  Further, the suspension member 30 has a male screw portion 30a at the lower end, and the male screw portion 30a is penetrated through the upper surfaces of the support beams 20, 20,... And is fixed by tightening a nut 30b. The means for fixing the suspension member 30 and the support beams 20, 20,... Is not limited to bolting, and other fixing means may be used.

  In the suspension-type measuring unit 5, by rotating the support piece 35, the movable tube 34 moves up and down with respect to the support plate 12, and accordingly, the load measuring means 31 and the elevating means 32 with respect to the support plate 12. The height of the suspension member 30 can be adjusted for each unit.

  In addition, the suspension type measurement unit 5 can raise and lower the suspension member 30 by operating the lifting / lowering means 32, and the landing table 6 supported by the suspension member 30 shown in FIG. It can be moved between a state (vehicle moving position) and a state (measurement position) where the load acting on the suspension member 30 is separated from the ground 3 shown in FIG. Has become.

  Next, a measurement method using the vehicle weighing device 2 will be described.

  First, the lifting / lowering means 32 of each of the suspension-type measuring units 5, 5,... Is lowered, and the loading table 6 is settled, that is, both ends of each of the support beams 20, 20,. 4 (a vehicle moving position).

  Next, in this state, the measured value of the load measuring means 31 of each of the suspension-type measuring units 5, 5,... Is checked, and whether an unbalanced load is acting on each of the suspension-type measuring units 5, 5,. It is confirmed whether any of the load measuring means 31 detects the load.

  When an unbalanced load is acting on each of the suspension-type measuring units 5, 5,..., The supporting piece 35 is rotated with the elevating means 32 lowered, and all the load measuring means 31 The height of the movable tube part 34 is adjusted so that the load becomes zero.

  Further, the suspension member 30 is lifted by the lifting / lowering means 32 to bring the loading table 6 above the ground 3, and in this state, the support piece 35 is rotated while checking the measured value of the load measuring means 31, The height of the movable pipe part 34 is adjusted so that the measured values of all the load measuring means 31 become constant.

  Then, when the adjustment is completed, each suspension member 30 is lowered by the lifting / lowering means 32, and as shown in FIG.

  Next, as shown in FIGS. 1 to 3, the vehicle 1 such as a dump truck is moved onto the loading platform 6 through the slopes 7 and 7 and stopped at a predetermined position on the loading platform 6.

  At this time, since the loading platform 6 is in a landed state, a dynamic load caused by an impact and a movement when the vehicle 1 enters the loading platform 6 does not act on the load measuring unit 31.

  After the vehicle 1 has stopped at a predetermined position, as shown in FIG. 5, the control device operates the lifting / lowering means 32 of each of the suspension-type measuring units 5, 5,... Synchronously. The loading table 6 is raised by the displacement.

  Next, it is confirmed that the increase in the measured value of the load measuring means 31 has stopped, and the elevating means 32 is stopped. In this state, the load is measured by the load measuring means 31, and the measured values are added up. The weight of the vehicle 1 including the load is calculated.

  Further, the calculating means can also calculate the accurate weight of the load by subtracting the weight of the vehicle 1 itself measured in advance from the weight of the vehicle 1 including the load amount.

  Then, when the weight measurement of the vehicle 1 is completed, the lifting / lowering means 32 of each suspension-type measuring unit 5 is operated synchronously, and the loading table 6 is lowered at a constant displacement by each of the lifting / lowering means 32 to land on the bottom.

  Finally, the vehicle 1 is moved from the loading platform 6 through the slopes 7, 7 with the loading platform 6 landing, and the weighing is completed. In this case as well, since the loading platform 6 is in a landed state, an impact when the vehicle 1 moves from the loading platform 6 and a dynamic load caused by the movement do not act on the load measuring means 31.

  The vehicle weighing device 2 configured as described above has a structure in which the loading platform 6 on which the vehicle 1 is loaded is suspended via a number of suspension-type measurement units 5, 5,. The height can be reduced, and accordingly, the slopes 7 for guiding the vehicle 1 to the loading platform 6 can be reduced in size. The small size and low profile make it easy to carry.

  In addition, the vehicle weighing device 2 includes an elevating means 32 in each suspension-type measuring unit 5, and the vehicle 1 enters the loading platform 6 and exits from the loading platform 6 with the loading platform 6 landing. The effect of the impact and the dynamic load associated with the movement of the vehicle 1 on the load measuring means 31 is suppressed.

  Furthermore, the load measuring means 31 is less affected by the impact and dynamic load caused by the movement of the vehicle 1 and the suspension measuring unit 5 is multi-pointed, so that the load measuring means 31 has a small capacity load cell. Can be adopted, and the measurement accuracy can be improved.

  That is, the rated capacity of the load measuring means 31 (load cell) is calculated by the following equation, and the rated capacity of the load cell can be reduced by increasing the number of load cells. In addition, in this vehicle 1 weighing device, the vehicle 1 can be moved with the loading platform 6 landing, so that the setting of the impact coefficient can be reduced, and the rated capacity of the load cell can be reduced accordingly. it can.

Equation 1

(Capacity of load cell) ≧ ｛(impact coefficient × impossible load + initial load) × load eccentricity coefficient × load imbalance coefficient｝ ÷ (number of load cells)
Impact coefficient: 1.1 to 1.5 (normally 1.3)
Load eccentricity coefficient: 1.1 to 1.3 (normal 1.2)
Load imbalance coefficient: 1 point, 1 for 3 points, 1.2 for 4 points
Impossible load: Maximum load of the object to be measured Initial load: Self-weight of equipment

  On the other hand, the total accuracy σs when a plurality of load cells are electrically added is calculated by the following equation. The greater the number of load cells, the higher the total accuracy.

Equation 2

但し、σ_Ｔ：ロードセル単体の総合精度、Ｎ：ロードセルの個数

Where σ _T : total accuracy of load cell alone, N: number of load cells

  Further, since the accuracy of the load cell is proportional to the rated capacity, the vehicle weighing device 2 has the suspension type measuring units 5, 5,. By allowing the vehicle 1 to enter and leave the loading platform 6, a load cell having a small rated capacity can be adopted as the load cell, so that high accuracy can be realized. I have.

  Further, the vehicle weighing device 2 is provided with the level adjusting means 33 for each of the suspension type measuring units 5, so that even when the ground 3 sinks, each leveling means 33 is provided by the level adjusting means 33. Since the level of the type measuring unit 5 can be adjusted, a large concrete foundation is not required, and the concrete measuring unit 5 can be installed on the unpaved ground 3.

  .. Are not limited to the above-described embodiment, and the arrangement of the level adjusting means, the load measuring means 31, and the lifting / lowering means 32 can be appropriately changed.

  Further, the load measuring means 31 is not limited to the compression type load cell having the center hole described above. For example, a load cell for measuring a tensile load is used, and the upper end of the suspension member 30 is connected to act on the suspension member 30. The tensile load to be applied may be measured.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Vehicle weighing device 3 Ground 4 Supporting member 5 Suspended measuring unit 6 Loading table 7 Slope 10 Substrate unit 11 Side plate unit 12 Support plate unit 13 Insertion hole 20 Support beam 21 Loading plate 30 Suspension member 31 Load Measuring means 32 Elevating means 33 Level adjusting means 34 Movable tube 35 Supporting piece 36 Bearing 37 Washer 38 Anchor member

Claims (3)

In a vehicle weighing device that measures the weight of a vehicle,
Supporting members arranged on both sides of the ground, a plurality of suspension-type measuring units suspended from the respective supporting members, and supported by the two supporting members via the plurality of suspension-type measuring units With a loading platform
The suspension-type measurement unit includes a suspension member that supports the loading platform, a load measurement unit that measures a load acting on the suspension member, and a lifting unit that raises and lowers the suspension member.
A weighing device for a vehicle, wherein the suspension member is lowered to allow the vehicle to enter with the cargo bed settled down.   The vehicle weighing device according to claim 1, wherein each of the suspension-type measurement units includes a level adjustment unit that adjusts a level of the load measurement unit.   The above-mentioned loading platform is provided with a plurality of supporting beam members directed in a direction between supporting members, both ends of which are supported by the suspension-type measuring unit, and a loading plate bridged over the supporting beam members. Or the weighing device for a vehicle according to 2.

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