WO2019130449A1

WO2019130449A1 - Weighing device

Info

Publication number: WO2019130449A1
Application number: PCT/JP2017/046795
Authority: WO
Inventors: 明成奥ノ園; 敏明木下
Original assignee: 大和製衡株式会社
Priority date: 2017-12-26
Filing date: 2017-12-26
Publication date: 2019-07-04
Also published as: JP6935515B2; JPWO2019130449A1

Abstract

This weighing device has an increased measurable weight range and prevents reduction in measurement accuracy by keeping load cell capacity down. The weighing device (1) is for measuring the weight of an object to be weighed and comprises a placement base (12) upon which the object to be weighed is placed and a plurality of load cells (13) for detecting the load of the object to be weighed placed on the placement base (12). The plurality of load cells (13) comprise at least a pair of front end load cells (31a, 31b) disposed at a front end, a pair of rear end load cells (32a, 32b) disposed at a rear end, and a pair of central load cells (33a, 33b) disposed between the front end load cells (31a, 31b) and rear end load cells (32a, 32b). The pair of central load cells (33a, 33b) are disposed at positions further removed from the object to be weighed placed on the placement base (12) than the front end load cells (31a, 31b) and rear end load cells (32a, 32b).

Description

Weighing device

The present invention relates to a weighing device for measuring the weight of an object to be weighed.

Conventionally, a weighing device is known as a device for measuring the weight of an object to be weighed. The weighing device includes a stage on which the object to be weighed is placed, and a load cell for supporting the stage, and detects the load that the load cell receives from the stage when the object to be weighed is placed on the stage. Thus, the weight of the object to be weighed can be measured.
As such a weighing device, there is, for example, an axle scale which measures the weight of a vehicle such as a truck. The load is supported by a plurality of load cells, and the total weight of the weight detected by each load cell is measured as the weight of the vehicle.
Generally, when the stage is formed in a rectangular shape, a total of four load cells are often provided in the vicinity of the corner of the stage (see, for example, Patent Document 1).

JP, 2014-071064, A

In recent years, there has been a demand to expand the range of measurable weight, and in order to meet this demand, attempts have been made to use a large capacity load cell or to increase the number of load cells.
However, increasing the capacity of the load cell reduces the measurement accuracy.
In addition, when the number of load cells is increased, a large load may be applied to some of the load cells (load cells disposed between the corners) when the wheels of the vehicle are mounted on the platform, and therefore the largest load is applied. It is necessary to determine the capacity of the load cell according to the part. Since it is preferable to make the capacity of each load cell the same from the viewpoint of maintenance and management, other load cells that do not apply a large load will be a load cell with a capacity larger than necessary, and as a result, it will fall below the expected measurement accuracy.

Then, this invention is made in view of the above-mentioned subject, and it is providing the measuring device which can expand the range of measurable weight, suppressing the capacity of a load cell and preventing a fall of measurement accuracy. With the goal.

In order to achieve the above object, a weighing device according to the present invention is a weighing device for measuring the weight of a to-be-measured item, and the mounting table for placing the to-be-measured object and the above-mentioned mounted on the table A plurality of load cells for detecting the load of the object to be weighed, the plurality of load cells comprising a pair of front end load cells disposed at the front end, a pair of rear end load cells disposed at the rear end, and the front end At least a pair of middle load cells disposed between the rear load cells and the rear load cells, wherein the pair of middle load cells are located on the front side of the front end load cells and the rear load cells. It is characterized by being provided in the position away from the placed said to-be-measured item.

Further, each load cell is preferably provided at a position outside the front stand.

Further, the pair of intermediate portion load cells are provided at a position facing the object to be weighed placed on the table with the straight line connecting the fulcrum of the front end load cell and the fulcrum of the rear end load cell. Is preferred.

Further, it is preferable that the distance from the object to be weighed in the front stand to the fulcrum of the front end load cell or the fulcrum of the rear end load cell be equal to the distance from the object to be weighed to the fulcrum of the intermediate load cell.

Moreover, it is preferable that the guide part which guides the mounting position of the said to-be-measured item is provided in the mounting surface of the said to-be-measured item in the above-mentioned stand.

Moreover, it is preferable that the said to-be-measured item is a vehicle.

According to the weighing device of the present invention, it is possible to expand the range of measurable weight while suppressing the capacity of the load cell to prevent the decrease in measurement accuracy.

It is a perspective view showing a measuring device concerning an embodiment of the invention. It is a top view of a measuring device. (A) is a cross-sectional view taken along the line AA in FIG. 2, (b) is a cross-sectional view taken along the line BB in FIG. It is a top view explaining arrangement of a load cell of a weighing device. It is a top view explaining the distance of two load cells of a weighing device, and a thing to be weighed. It is a top view explaining the distance of three load cells of a weighing device, and a thing to be weighed. (A) is a 1st modification of a measuring device, (b) is a figure which shows a 2nd modification. It is a figure which shows the 3rd modification of a measuring device. It is a figure which shows the 4th modification of a measurement apparatus.

Preferred embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples, and various embodiments can be taken within the scope of the present invention.

<Overall configuration of weighing device>
FIG. 1 is a perspective view showing a weighing device according to an embodiment of the present invention. FIG. 2 is a plan view of the weighing device. FIG. 3 is a cross-sectional view of the weighing device, (a) is a cross-sectional view taken along the line AA of FIG. 2, and (b) is a cross-sectional view taken along the line BB of FIG. FIG. 4 is a plan view illustrating the arrangement of load cells of the weighing device. FIG. 5 is a plan view illustrating the distance between the two load cells of the weighing device and the object to be weighed. FIG. 6 is a plan view illustrating the distance between the three load cells of the weighing device and the object to be weighed.
In the following, for convenience of explanation, the longitudinal direction of the weighing device 1 is “left and right direction X”, the width direction orthogonal to the left and right direction is “front and back direction Y”, and the height direction along the vertical direction is “height direction H”. I assume.

The weighing device 1 measures the weight of an object to be weighed, for example, a vehicle 200 such as a truck. The weighing device 1 is disposed in a pit (hole) 230 formed on the ground 220 (see FIG. 3A), as shown in FIGS. Two weighing devices 1 are provided side by side along the width direction of the vehicle 200.
The left wheel 201 is mounted on one of the weighing devices 1 by moving the wheel 201 of the vehicle 200 in the front-rear direction Y (the moving direction of the vehicle 200) with respect to the two weighing devices 1, The right wheels 201 are placed on the device 1 respectively.
Since the configurations of the two weighing devices 1 are the same, hereinafter, the weighing device 1 disposed on the right side in the left-right direction X of FIG. 1 will be described, and the weighing device 1 on the left side in the left-right direction X will be described. I omit it.

As shown in FIG. 2, the weighing device 1 includes a platform 12 on which the wheel 201 is placed, and a plurality of load cells 13 that detect the load of the vehicle 200 placed on the platform 12.
In addition, the weighing device 1 includes a right non-placement unit 14 disposed at the right end 12a in the left-right direction X of the stage 12, a left non-placement unit 15 disposed at the left end 12b, and reinforcing

members

16a and 16b. The right side lid member 17, the left side lid member 18, and the central lid member 19 (see FIG. 1) for closing the pit 230 (see FIG. 3A) are provided.

(Loading table)
As shown in FIGS. 3A and 3B, the mounting table 12 has a flat mounting surface 21a on which the wheel 201 is mounted and a flat lower surface 21b parallel to the mounting surface 21a. And

side surfaces

21c and 21d that are perpendicular or substantially perpendicular to the mounting surface 21a and the lower surface 21b from the right end 12a or the left end 12b in the left-right direction X of the mounting table 12.
The mounting surface 21 a is formed in a rectangular shape extending in the left-right direction X, and is disposed at the same height as the ground 220.

(Load cell)
As shown in FIG. 2, the plurality of load cells 13 includes a pair of front

end load cells

31 a and 31 b disposed at the front end in the front-rear direction Y (moving direction) and a pair of rear ends disposed at the rear end in the front-rear direction Y It includes a

partial load cell

32a, 32b and an

intermediate load cell

33a, 33b disposed between the pair of end load cells.
The load cells 13 (front

end load cells

31a and 31b, rear

end load cells

32a and 32b, and

intermediate load cells

33a and 33b) are provided at positions outside the mounting table 12 in the left-right direction X. As shown in FIGS. 3 (a) and 3 (b), the upper end of the load cell 13 is fixed to the right non-placement portion 14 or the left side non-placement portion 15 via the upper end side receiving bracket 35 and the mounting member 36. ing. The lower end of the load cell 13 is fixed to the base member 38 disposed on the bottom surface 230 a of the pit 230 via the lower side receiving bracket 37. The plurality of load cells 13 are preferably load cells all having the same capacity.

The front end load cell 31a and the front end load cell 31b, the rear end load cell 32a and the rear end load cell 32b, and the intermediate load cell 33a and the intermediate load cell 33b are disposed to face each other across the stage 12 in the left-right direction X ing.
The front end load cell 31 a, the rear end load cell 32 a, and the middle load cell 33 a are disposed below the right non-placement unit 14. The front end load cell 31 b, the rear end load cell 32 b, and the middle load cell 33 b are disposed below the left side non-mounting portion 15. That is, in one weighing device 1, a total of six load cells 13 are provided below the right non-mounting portion 14 and three three below the left non-mounting portion 15.

As specifically shown in FIG. 4, the front end load cell 31a and the rear end load cell 32a are disposed linearly or substantially linearly along the longitudinal direction Y, and the middle load cell 33a is a front end load cell 31a. And, it is provided at a position farther from the wheel 201 mounted on the mounting table 12 than the rear end load cell 32a. That is, the intermediate load cell 33a is located at a position where the fulcrum P3a faces the wheel 201 mounted on the pedestal 12 with a straight line La connecting the fulcrum P1a of the front end load cell 31a and the fulcrum P2a of the rear end load cell 32a. The

end load cells

31a and 32a are provided at positions separated in the left-right direction X from the

end load cells

31a and 32a.
Similarly, as shown in FIG. 4, the front end load cell 31b and the rear end load cell 32b are disposed linearly or substantially linearly along the longitudinal direction Y, and the middle load cell 33b is disposed at the front end load cell 31b. And, it is provided at a position farther from the wheel 201 placed on the stage 12 than the rear end load cell 32b. That is, in the middle load cell 33b, the fulcrum P3b is opposed to the wheel 201 mounted on the table 12 with the straight line Lb connecting the fulcrum P1b of the front end load cell 31b and the fulcrum P2b of the rear end load cell 32b. The

end load cells

31 b and 32 b are provided at positions separated in the left-right direction X from the

end load cells

31 b and 32 b.
Specifically, the front end load cell 31a and the front end load cell 31b are disposed on or near the straight line formed by the side on the front end side in the front-rear direction Y of the mounting surface 21a, and similarly, the rear end load cell 32a and The rear end load cell 32b is disposed on or near a straight line formed by the side on the rear end side in the front-rear direction Y of the mounting surface 21a. That is, the front end load cell 31a and the front end load cell 31b, and the rear end load cell 32a and the rear end load cell 32b are disposed in the front-rear direction Y at or near the boundary between the mounting surface 21a and the ground 220. .

With regard to the load applied to the plurality of load cells 13, the maximum load is applied when the positional relationship is such that the distance between the fulcrum point (P1a, P2a, P3a) and the wheel 201 is shortest. However, since the ground contact surface of the wheel 201 has a certain area, the wheel 201 starts to enter the mounting surface 21 a and is completely mounted on the mounting surface 21 a or from the mounting surface 21 a When the wheel 201 is at a position from the beginning of leaving to the point of completely leaving the mounting surface 21a, the load of the wheel 201 is dispersed according to the ratio of the contact surface where the wheel 201 contacts the mounting surface 21a and the ground 220. Even when the distance between the fulcrum point (P1a, P2a) and the wheel 201 is in the shortest positional relationship, each of the front

end load cell

31a, 31b and the rear

end load cell

32a, 32b is essentially the same as that of the wheel 201. There is no full load. However, when the distance between the fulcrum P3a and the wheel 201 is in the shortest positional relationship, the

intermediate load cell

33a, 33b receives the maximum load because the load from the wheel 201 is not dispersed with the ground 220.
Therefore, the middle load cell 33a is positioned at the front end load cell 31a and the rear load cell 31a at a position facing the table 12 with a straight line La connecting the fulcrum points (P1a and P2a) of the pair of front end load cells 31a and rear end load cells 32a. It is provided at a position farther from the wheel 201 mounted on the mounting surface 21 a than the end load cell 32 a. The load applied to the intermediate load cell 33a decreases as the position at which the intermediate load cell 33a is provided is further from the side surface 21c, but it is preferable that all the capacities of the load cells 13 be the same in terms of maintenance and management. For this reason, it is most preferable that the intermediate load cell 33a be provided at the same load as or at a load close to the maximum load applied to at least one of the front end load cell 31a and the rear end load cell 32a. Most preferably, the intermediate load cell 33a is provided at the same or substantially the same position as such a position. Specifically, in the weighing device 1 according to the embodiment of the present invention in which three load cells 13 are provided below the right non-placement portion 14 or below the left side non-placement portion 15, from the side 21c to the front end load cell 31a The front end load cell 31a and the rear end load cell 32a are arranged such that the distance from the side surface 21c to the rear end load cell 32a is equal, and the supporting point (P1a, P1a, of the front end load cell 31a and the rear end load cell 32a) At a position where a load equal to or close to the maximum load applied to the front end load cell 31a and the rear end load cell 32a is applied on a straight line Lc passing through the middle point Na of the straight line La connecting P2a) and orthogonal to the straight line La An intermediate load cell 33a is disposed.

Similarly, the intermediate load cell 33b is opposed to the platform 12 with a straight line Lb connecting the pair of front end load cells 31b and rear end load cells 32b at the supporting points (P1b, P2b). It is provided at a position farther from the wheel 201 placed on the placement surface 21 a than the rear end load cell 32 b. The load applied to the intermediate load cell 33b decreases as the position at which the intermediate load cell 33b is provided is further from the side surface 21d, but it is preferable that all the capacities of the load cells 13 be the same in terms of maintenance and management. For this reason, it is most preferable that the intermediate load cell 33b be provided at the same load as or at a load close to the maximum load applied to at least one of the front end load cell 31b and the rear end load cell 32b. Most preferably, the intermediate load cell 33b is provided at the same or substantially the same position as such a position. Specifically, in the weighing device 1 according to the embodiment of the present invention in which three load cells 13 are provided below the right non-placement unit 14 or below the left non-placement unit 15, the side surface 21 d to the front end load cell 31 b The front end load cell 31b and the rear end load cell 32b are arranged such that the distance between the side face 21d and the rear end load cell 32b is equal, and the fulcrum point (P1b, P1 b, of the front end load cell 31b and the rear end load cell 32b) P2b) through the middle point Nb of the straight line Lb and on the straight line Ld orthogonal to the straight line Lb, at a position where the same load as the maximum load applied to the front end load cell 31b and the rear end load cell 32b is applied An intermediate load cell 33 b is disposed.

Hereinafter, an example of a specific method of easily determining the position where the

intermediate load cells

33a and 33b are provided will be described.
When the wheel 201 and the mounting surface 21a have a relationship as shown in FIG. 5 and the wheel 201 is mounted on the right end 12a of the mounting base 12, the wheel 201 and the mounting surface 21a The largest load is applied to the rear end load cell 32a when all of the contact surfaces are placed on the stage 12 (when the wheel 201 is placed at the position indicated by the dotted line). Therefore, when the distance L2a from the center O of the contact surface between the wheel 201 and the mounting surface 21a at this time to the fulcrum P2a of the rear end load cell 32a and when the wheel 201 moves in the forward direction (the wheel 201 So that the shortest distance L3a 'from the center O' of the contact surface between the wheel 201 and the mounting surface 21a to the fulcrum P3a 'of the intermediate load cell 33a' becomes equal. Preferably, the rear end load cell 32a and the middle load cell 33a are disposed (L2a = L3a '). However, considering the relative sizes of the wheel 201 and the mounting surface 21a in FIG. 5, the distance L2a from the center O of the contact surface between the wheel 201 and the mounting surface 21a to the fulcrum P2a of the rear end load cell 32a The rear end load cell 32a and the middle load cell 33a may be disposed such that the distances L3a from the center O of the wheel 201 to the fulcrum P3a of the middle load cell 33a are equal. That is, the rear end load cell 32a is arranged such that the fulcrum P2a of the rear end load cell 32a centered on the center O of the wheel 201 and the curve L4a connecting the fulcrum P3a of the middle load cell 33a have an arc shape or a substantially arc shape. And the intermediate portion load cell 33a may be disposed (L2a = L3a).
As shown in FIG. 6, when the wheel 201 is mounted at a position away from the right end 12a of the mounting table 12, the front end from the center O of the wheel 201 when the intermediate load cell 33a is subjected to the maximum load. The distance L1a to the fulcrum P1a of the partial load cell 31a, the distance L2a from the center O of the wheel 201 to the fulcrum P2a of the rear end load cell 32a, and the distance L3a from the center O of the wheel 201 to the fulcrum P3a of the intermediate load cell 33a are equal Thus, it is preferable that the front end load cell 31a, the rear end load cell 32a, and the intermediate load cell 33a be disposed (L1a = L2a = L3a). That is, the curve L5a connecting the fulcrum P1a of the front end load cell 31a, the fulcrum P2a of the rear end load cell 32a, and the fulcrum P3a of the middle load cell 33a around the center O of the wheel 201 is arc-shaped or substantially arc-shaped Preferably, a front end load cell 31a, a rear end load cell 32a, and an intermediate load cell 33a are disposed.

(Right side non-mounting part and left side non mounting part)
As shown in FIG. 2, the right non-placement unit 14 and the left side non-placement unit 15 are provided symmetrically with respect to the center of the weighing device 1 in the left-right direction X. It is arranged on both sides.
The right non-placement portion 14 is disposed below the right side lid member 17 and on the right end 12 a side of the stage 12. In the right non-placement portion 14, one side edge 14a in the left-right direction X extends linearly along the right end 12a of the stage 12, and the other side edge 14b in the left-right direction X extends in the front-rear direction Y The central portion is formed to project outward.
The left side non-mounting portion 15 is disposed below the left side lid member 18 and on the left end 12 b side of the mounting table 12. One side edge 15 a of the left side non-mounting portion 15 in the left-right direction X extends linearly along the left end 12 b of the mounting table 12, and the other side edge 15 b in the left-right direction X is the center in the front-rear direction Y The portion is formed to project outward.

(Reinforcement member)
As shown in FIGS. 2 and 3, the reinforcing member 16 a is a member that reinforces the connection by welding between the side surface 21 c of the mounting table 12 and the right non-placement portion 14, and the reinforcing member 16 b is of the mounting table 12. It is a member which reinforces the connection by welding with side 21d and left side mounting part 15. The reinforcing member 16a is formed in a substantially L shape in a front view, and extends in the left-right direction X with a side reinforcing portion 61a extending in the height direction H and connected to the side surface 21c of the mount 12. And a non-mounting portion reinforcing portion 62 a connected to the right non-mounting portion 14. The reinforcing member 16 a reinforces the connection between the side surface 21 c and the right non-placed portion 14 at two places by two reinforcing members 16 a separated in the front-rear direction Y.
The reinforcing member 16b is formed in a substantially L-shape in a front view, and extends in the left-right direction X with a side reinforcing portion 61b extending in the height direction H and connected to the side surface 21d of the mount 12. And a non-mounting portion reinforcing portion 62b connected to the left non-mounting portion 15. The reinforcing member 16 b reinforces the connection between the side surface 21 d and the left non-placed portion 15 at two places by two reinforcing members 16 b separated in the front-rear direction Y.
Although FIG. 3B shows the reinforcing member 16a, the reinforcing member 16b is also similar to the reinforcing member 16a.
In addition, when the welding state of the side surface 21 c of the mounting table 12 and the right side non-mounting portion 14 and the welding state of the side surface 21 d of the mounting table 12 and the left side non mounting portion 15 are strongly welded, a reinforcing

member

16a and 16b may be omitted.

(Right lid and left lid)
As shown in FIG. 2 and FIG. 3, the right side lid member 17 and the left side lid member 18 are formed of rectangular plate members, and are disposed on both sides of the platform 12 in the left-right direction X. The right side lid member 17 and the left side lid member 18 are supported by the support members 20 provided in the height direction H in the pit 230, and the mounting surface with the rectangular plate surface directed in the height direction H 21a and the ground 220 are arranged at the same height.
The right side lid member 17 is disposed above the right side non-mounting portion 14 and at the right end 12 a of the mounting table 12 in the left-right direction X. One side edge 17 a of the right side lid member 17 in the left-right direction X is disposed at an interval from the right end 12 a of the stage 12.
The left side lid member 18 is disposed above the left side non-mounting portion 15 and at the left end 12 b of the mounting table 12 in the left-right direction X. One side edge 18 a of the left lid member 18 in the left-right direction X is disposed at an interval from the left end 12 b of the stage 12.

(Central lid member)
As shown in FIG. 1, the central lid member 19 is formed of a rectangular or substantially rectangular plate member, and with the rectangular plate surface directed in the height direction H, the two lids of the weighing device 1 are provided. It is arrange | positioned at the same height as the mounting surface 21a and the ground 220 between.

<Measurement of weight by weighing device>
Next, measurement of weight by the above-described weighing device 1 will be described with reference to FIGS. 1 to 4.
As shown in FIG. 1, when the weight of the vehicle 200 is measured, the vehicle 200 is moved from the rear end to the front end in the front-rear direction Y of the two weighing devices 1, and the pair of left and right wheels 201 is mounted on the two weighing devices 1. Each is mounted on the mounting surface 21a.
When the wheel 201 is placed on the placement surface 21a, the load of the vehicle 200 is applied to the non-placement portion 14 and the non-placement portion 15 connected by the placement surface 21a and the reinforcing

members

16a and 16b. Each load cell 13 connected below the right non-mounting portion 14 and the left non-mounting portion 15 detects a load, and the weight is measured based on the result detected by each load cell 13.

Here, in the weighing device 1, as shown in FIG. 4, the front end load cell 31a and the rear end load cell 32a are linearly arranged along the longitudinal direction Y, and the middle load cell 33a is the front end. The load cell 31 a and the rear end load cell 32 a are provided at positions farther from the stage 12. Further, the front end load cell 31 b and the rear end load cell 32 b are linearly arranged along the longitudinal direction Y, and the middle load cell 33 b is closer to the mount 12 than the front end load cell 31 b and the rear end load cell 32 b. It is provided at a distant position.
For this reason, even if the vehicle 200 moves close to the

intermediate load cells

33a and 33b, the distance from the load application position (the position of the wheel 201) to the

intermediate load cells

33a and 33b is from the load application position to the front end load cell The load applied to the

load cells

31a and 31b and the rear

end load cells

32a and 32b is approximately equal or equal, and no large load is concentrated on the

intermediate load cells

33a and 33b. it can. As a result, the capacities of the

intermediate load cells

33a and 33b can be made the same as the capacities of the front

end load cells

31a and 31b and the rear

end load cells

32a and 32b.

As described above, since the application of a large load to the

intermediate load cells

33a and 33b is suppressed, it is possible to widen the range of measurable weights while suppressing the capacity of the load cells to prevent the decrease in measurement accuracy.
Moreover, in the conventional weighing device, the fulcrum of the front end load cell, the fulcrum of the rear end load cell, and the fulcrum of the middle load cell are usually arranged in a straight line. For this reason, when assembling a measuring device in the pit 230, it is difficult to adjust the level, and the working efficiency at the time of assembling is reduced.

On the other hand, as shown in FIG. 4, in the weighing apparatus 1, the

intermediate load cells

33a and 33b are fulcrums P1a and P1b of the front

end load cells

31a and 31b and fulcrums P2a and P2b of the rear

end load cells

32a and 32b. Are provided at positions opposite to the table 12 with the straight lines La and Lb connecting them. Therefore, for example, when the right non-placement portion 14 or the left non-placement portion 15 is fixed to the upper end of the load cell 13 via the upper end side receiving bracket 35 and the attachment member 36, the front

end load cells

31a and 31b and the rear end The right non-mounting portion 14 and the left non-mounting portion 15 can be stably fixed by the

partial load cells

32a and 32b and the

middle load cells

33a and 33b.

Further, the load cell 13 is disposed below the right non-placement unit 14 or the left non-placement unit 15 disposed across the stage 12 in the left-right direction X. That is, since the vehicle 200 is not directly mounted on the right non-mounting portion 14 or the left non-mounting portion 15, the load cell 13 is prevented from being subjected to a large load, and the load cell 13 is broken. It can be prevented.

<Modification>
7 to 9 are views showing a modification of the weighing device shown in FIG. 1, and FIG. 7 is a view showing a first modification and a second modification of the weighing device shown in FIG. 6A is a view showing a first modification in which two middle load cells are arranged, and FIG. 6B is a view showing a second modification in which three middle load cells are arranged. FIG. 8 is a view showing a third modification of the weighing device shown in FIG. FIG. 9 is a view showing a fourth modification of the weighing device shown in FIG. In the following modification, the same components as those of the weighing device of FIG. 1 are denoted by the same reference numerals, and different parts will be described.

In the weighing device 101 according to the first modification, as shown in FIG. 7A, the front end load cell 31a and the rear end load cell 32a are disposed linearly or substantially linearly along the longitudinal direction Y. Two

middle load cells

133 and 134 are disposed between the front end load cell 31a and the rear end load cell 32a. That is, two load cells are disposed between the front end load cell 31a and the rear end load cell 32a.
The

intermediate load cells

133 and 134 are provided at positions farther from the stage 12 (see FIG. 2) than the front end load cell 31 a and the rear end load cell 32 a. That is, the

intermediate load cells

133 and 134 are provided at positions opposed to the table 12 with a straight line La connecting the fulcrum P1a of the front end load cell 31a and the fulcrum P2a of the rear end load cell 32a. In addition, when the passing position of the wheel is determined on the platform, a position where the load is applied to the front end load cell 31a, the rear end load cell 32a, and the intermediate load cells 133 and 134 (contact between the wheel and the platform) It is preferable to arrange | position so that it may become circular arc shape or substantially circular arc shape centering | focusing on the center point of a surface.
The two middle load cells disposed between the front end load cell 31b and the rear end load cell 32b shown in FIG. 4 are similarly provided at positions facing the table 12 with the straight line Lb interposed therebetween.

As described above, since the

intermediate load cells

133 and 134 are provided at positions farther from the stage 12 (see FIG. 2) than the front end load cells 31 a and the rear end load cells 32 a, the

intermediate load cells

133 and 134 are heavily loaded. Can be suppressed. For this reason, while being able to hold down the capacity of a load cell and prevent the fall of measurement accuracy, the range of measurable weight can be expanded, and when assembling a weighing device in pit 230 (refer to Drawing 3 (a)), it is stable. The assembly efficiency can be improved easily.

In the weighing device 102 according to the second modification, as shown in FIG. 7B, the front end load cell 31a and the rear end load cell 32a are disposed linearly or substantially linearly along the longitudinal direction Y. Three

middle load cells

233, 234 and 235 are arranged between the front end load cell 31a and the rear end load cell 32a. That is, three load cells are disposed between the front end load cell 31a and the rear end load cell 32a.

The

intermediate load cells

233, 234, and 235 are provided at positions farther from the stage 12 (see FIG. 2) than the front end load cell 31a and the rear end load cell 32a. That is, the

intermediate load cells

233, 234, and 235 are provided at positions facing the stage 12 with a straight line La connecting the fulcrum P1a of the front end load cell 31a and the fulcrum P2a of the rear end load cell 32a. In addition, when the passing position of the wheel is determined on the platform, a position where the load is applied to the front end load cell 31a, the rear end load cell 32a, and the

middle load cell

233, 234, and 235 (wheel and platform It is preferable to arrange | position so that it may become circular arc shape or substantially circular arc shape centering | focusing on the central point of the contact surface of (1).

The three middle load cells disposed between the front end load cell 31 b and the rear end load cell 32 b shown in FIG. 4 are also provided at positions opposite to the table 12 with the straight line Lb interposed therebetween.

As described above, since the

intermediate load cells

233, 234, and 235 are provided at positions farther from the pedestal 12 (see FIG. 2) than the front end load cells 31a and the rear end load cells 32a, the

intermediate load cells

233, 234, and 235 are provided. It can suppress that a big load is applied. For this reason, while being able to hold down the capacity of a load cell and prevent the fall of measurement accuracy, the range of measurable weight can be expanded, and when assembling a weighing device in pit 230 (refer to Drawing 3 (a)), it is stable. The assembly efficiency can be improved easily.
That is, as shown in the first modified example and the second modified example, the number of intermediate load cells is arbitrary and can be freely changed.

In the weighing device 103 of the third modification,

guide portions

113a and 113b and guide

portions

123a and 123b for guiding the mounting position of the wheel 201 of the vehicle 200 are provided on the mounting surface 21a of the mounting table 12.
The

guide portions

113a and 113b and the

guide portions

123a and 123b are formed of cylindrical or prismatic members that extend in the front-rear direction Y.
The guide portion 113a and the guide portion 113b guide a vehicle in which the left and right wheels can pass between the guide portion 113a and the guide portion 113b. Specifically, when the vehicle moves from the rear end to the front end in the front-rear direction Y of the two weighing devices 103, the outside of the pair of left and right wheels 201 is made accessible.
The guide portion 123a and the guide portion 123b are wheels on the right side between the guide portion 113a and the guide portion 123a, and a wheel on which the left wheel can pass between the guide portion 113b and the guide portion 123b, that is, the guide portion 113a And a guiding portion 113b, which guides the vehicle having a width larger than that of the vehicle which can pass through. Specifically, when the vehicle moves from the rear end to the front end in the front-rear direction Y of the two weighing devices 103, the guide portion 113a is made inside the right wheel and the guide portion 123a is made accessible to the outside of the right wheel. ing. Further, the guide portion 123a is accessible to the inside of the left wheel, and the guide portion 123b is accessible to the outside of the left wheel.
As described above, since the

guide portions

113a and 113b and the

guide portions

123a and 123b can approach the wheels of the vehicle, the wheels are mounted on portions other than the mounting surface 21a of the right cover member 17 and the left cover member 18 etc. Since the wheel is guided to the mounting surface 21a by preventing the friction, it is possible to prevent the failure of the weighing device 1 and the measurement failure of the weight. In addition, since the positions of the wheels can be determined, the layout design of each load cell is facilitated. Each load cell can also be arranged in an arc from the center point of the contact surface between the wheel and the platform.
The guide unit for guiding the mounting position of the wheel 201 of the vehicle 200 may be a linear line drawn on the mounting surface 21 a of the mounting table 12 with a paint or the like.

In the weighing device 104 according to the fourth modification, as shown in FIG. 9, the front end load cell 431a and the rear end load cell 432a are disposed linearly or substantially linearly along the longitudinal direction Y, and are placed It is arrange | positioned inside the mounting surface 21a from the straight line which the edge | side of the front end side in the front-back direction Y of the surface 21a and the rear end side make. Specifically, the front end load cell 431a is disposed on the inside of the mounting surface 21a from the straight line formed by the side on the front end in the front-rear direction Y of the mounting surface 21a, and similarly, the rear end load cell 432a is mounted The surface 21a is disposed on the inner side of the placement surface 21a from the straight line formed by the side on the rear end side in the front-rear direction Y of the surface 21a.

The intermediate portion load cell 433a is provided at a position farther from the stage 12 than the front end load cell 431a and the rear end load cell 432a. That is, the intermediate load cell 433a is provided at a position facing the stage 12 with a straight line La connecting the fulcrum P1a of the front end load cell 431a and the fulcrum P2a of the rear end load cell 432a. When the front end load cell 431a and the rear end load cell 432a are arranged inside the mounting surface 21a as shown in FIG. 9, the maximum load on the front end load cell 431a and the rear end load cell 432a The middle load cell 431a and the rear end load cell can be enlarged by arranging the intermediate load cell 433a at any position away from the stage 12 with respect to the front end load cell 431a and the rear end load cell 432a. It is arranged at a position where a load equal to or close to the maximum load applied to 432a is applied.

For example, in the front end load cell 431a, the rear end load cell 432a, and the middle load cell 433a, the front end load cell 431a is disposed inside the mounting surface 21a from the straight line formed by the front end side in the front-rear direction Y of the mounting surface 21a. From the center O of the wheel 201 to the fulcrum P1a of the front end load cell 431a and the rear end side of the mounting surface 21a in the front-rear direction Y on the inside of the mounting surface 21a The distance L2a from the center O of the wheel 201 to the fulcrum P2a of the rear end load cell 432a when the load cell 432a is disposed and the distance L3a from the center O of the wheel 201 to the fulcrum P3a of the intermediate load cell 433a are equal (L1a = L2a = L3a). That is, the curve L6a connecting the fulcrum P1a of the front end load cell 431a around the center O of the wheel 201, the fulcrum P2a of the rear end load cell 432a, and the fulcrum P3a of the middle load cell 433a is arc-shaped or substantially arc-shaped The front end load cell 431a, the rear end load cell 432a, and the middle load cell 433a may be disposed.

Thus, the front end load cell 431a is disposed on the inside of the mounting surface 21a from the straight line formed by the sides on the front end in the front and rear direction Y of the mounting surface 21a, and the rear end load cell 432a is in the front and rear direction Y of the mounting surface 21a. Even in the case where the load cell 433a is disposed at a position away from the stage 12, a large load is applied to the middle load cell 433a even when the load cell 433a is disposed on the inner side of the placement surface 21a from the straight line formed by the rear end side. This can be suppressed. For this reason, while being able to hold down the capacity of a load cell and prevent the fall of measurement accuracy, the range of measurable weight can be expanded, and when assembling a weighing device in pit 230 (refer to Drawing 3 (a)), it is stable. The assembly efficiency can be improved easily.

<Others>
The weighing device according to the embodiment of the present invention is not limited to the above-described weighing

devices

1, 101, 102, 103, and 104 for measuring the weight of the object to be weighed, and is included in the concept of the present invention It includes all aspects. Moreover, you may selectively combine each structure of a measuring device suitably so that at least one part of the effect mentioned above may be show | played.
The weighing

devices

1, 101, 102, 103, and 104 described above include a wheel scale that measures the weight of each wheel 201 of the vehicle 200, a vehicle scale that measures the weight of the vehicle 200, and an axis that measures the axle weight of the vehicle 200. You may apply to a weighing scale.
The weighing

devices

1, 101, 102, 103, and 104 are not limited to vehicles, and can be applied to various weighing devices such as a freight car scale, a conveyor scale, and a weighing platform.
In the weighing

devices

1, 101, 102, 103, and 104 described above, although the load cell 13 is disposed below the right non-placement unit 14 or the left non-placement unit 15, either of the load cells 13 has been described. Some load cells or all load cells may be disposed below the mounting surface 21 a of the mounting table 12. That is, from the position where intermediate load cell 33a is separated from the position where load is applied from front end load cell 31a and rear end load cell 32a, and from middle load cell 33b from the position where load is applied from front end load cell 31b and rear end load cell 32b. As long as it is arrange | positioned in the distant position, you may be arrange | positioned under the mounting surface 21a of the mounting base 12. As shown in FIG.
As mentioned above, even if it substitutes to the thing of arbitrary structures which have the same function, the effect similar to the

measuring devices

1, 101, 102, 103, and 104 which concern on embodiment of this invention can be acquired.

1, 101, 102, 103, 104 weighing device 12 platform 13 load cell 14 right non-placement unit 15 left

non-placement unit

16a, 16b reinforcing member 17 right side lid member 18 left side lid member 19 central lid member 20 support member 21a mounted Mounting surface

21b Lower surface

21c,

21d Side surface

31a, 31b Front

end load cell

32a, 32b Rear

end load cell

33a, 33b Intermediate

part load cell

133, 134 Intermediate part load cell 200 Vehicle 201 Wheel 220 Ground 230

Pit

233, 234, 235 Intermediate part load cell X Left-right direction Y Front-back direction H Height direction

Claims

A weighing device for measuring the weight of an object to be weighed, comprising:
A stage on which the object to be weighed is placed;
And a plurality of load cells for detecting the load of the object placed on the table.
The plurality of load cells are a pair of front end load cells disposed at the front end, a pair of rear end load cells disposed at the rear end, and a pair disposed between the front end load cell and the rear end load cell. At least the middle load cell of the
The weighing device according to claim 1, wherein the pair of intermediate portion load cells are provided at a position distant from the object to be weighed placed on the front stand than the front end load cells and the rear end load cells.
The weighing device according to claim 1, wherein each load cell is provided at a position outside the front stand.
The pair of intermediate load cells are provided at a position facing the object to be weighed placed on the table with the straight line connecting the fulcrum of the front end load cell and the fulcrum of the rear end load cell. The weighing device according to claim 1, characterized in that:
It is characterized in that the distance from the object to be weighed in the front stand to the fulcrum of the front end load cell or the fulcrum of the rear end load cell is equal to the distance from the object to be weighed to the fulcrum of the intermediate load cell. Item 4. A measuring device according to any one of Items 1 to 3.
The guide surface which guides the mounting position of the said to-be-measured item is provided in the mounting surface of the said to-be-measured item in the above-mentioned table, The any one of Claim 1 to 4 characterized by the above-mentioned. Weighing device as described.
The weighing device according to any one of claims 1 to 5, wherein the object to be weighed is a vehicle.