JP7289187B2 - Weighing device - Google Patents

Description

The present invention relates to weighing devices.

Conventionally, a weighing device for measuring the weight of a vehicle has been known. A truck scale described in Patent Document 1 includes a rectangular plate weighing platform. The weighing platform is supported by four load cells provided near the four corners of the weighing platform. A load cell is installed on the base surface. The upper and lower ends of the load cell are spherically formed. The upper end of the load cell movably contacts the lower surface of the bracket on the weighing platform, and the lower end of the load cell movably contacts the upper surface of the bracket on the base surface.

JP 2016-109640 A

When a vehicle is placed on the top surface of the weighing platform, the weighing platform flexes according to the weight of the vehicle. Due to this deflection, the lower surface of the receiving bracket of the weighing platform is tilted, and accordingly the load cell itself is also tilted. Then, an error due to the inclination of the load cell appears in the output signal of the load cell. Therefore, in conventional truck scales, the strength of a member (main girder) extending in the longitudinal direction of the weighing platform is increased to reduce the bending that occurs in the weighing platform. In order to reduce the influence on the load cell as much as possible, the support metal fittings of the weighing platform are provided on the main girder having high strength. That is, the load cell was generally in contact with the main girder having high strength to support the weighing platform. In the truck scale of Patent Document 1 as well, the upper metal fitting is attached to a support beam extending in the longitudinal direction of the weighing platform. The load cell is in contact with the support beam via the upper metal fitting to support the scale.

However, if the thickness and dimensions of the members are increased to increase the strength of the main girder, the cost will increase and the weight of the weighing platform will increase, which may adversely affect weighing accuracy. In order to suppress the deflection of the main girder, it is effective to increase the vertical dimension of the main girder, but this is not preferable because the overall height of the truck scale increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a means for realizing a weighing apparatus that suppresses deterioration of weighing accuracy caused by bending of a weighing platform.

(1) A weighing device according to the present invention is a weighing device installed on a base surface, comprising a weighing platform having a rectangular flat plate shape, a load being applied to the upper surface, and a weighing platform extending in the lateral direction of the weighing platform. , a first member supporting the weighing platform; and a load cell disposed between the base surface and the first member and supporting the first member.

According to the above configuration, the first member that contacts the load cell is a member that extends in the lateral direction of the weighing platform, and therefore is less likely to bend than the member that extends in the longitudinal direction of the weighing platform. In addition, the first member and the weighing platform are separate members, that is, have a split structure. As a result, even if a load is applied to the weighing platform and the weighing platform bends, the tilting of the load cell is suppressed compared to the case where the load cell abuts against members extending in the longitudinal direction of the weighing platform to support the weighing platform. be. Therefore, it is possible to suppress the deterioration of the weighing accuracy due to the bending of the weighing platform.

(2) Preferably, the weighing device further includes a second member interposed between the first member and the weighing base and extending in the lateral direction. The distance between the central edge of the weighing platform of the second member and the central axis of the load cell is smaller than the distance between the central edge of the weighing platform of the first member and the central axis.

When a load is applied to the weighing platform and the weighing platform bends, the bottom surface of the weighing platform inclines downward as it progresses from the end of the weighing platform toward the center. Then, the weighing base abuts against the second member at the center side edge of the weighing base of the second member. Therefore, the point of action of the force acting on the second member from the weighing platform is the central side edge of the second member. On the other hand, when the first member does not include the second member, the weighing base contacts the first member at the central edge of the weighing base of the first member. Therefore, the point of action of the force acting on the first member from the weighing platform is the central side edge of the first member. Here, the farther the force application point is from the central axis of the load cell, the larger the moment of the force and the larger the error appearing in the output of the load cell. According to the above configuration, the distance between the center side edge of the second member and the center axis of the load cell is smaller than the distance between the center side edge of the first member and the center axis. As a result, a smaller moment of force is generated when the first member includes the second member than when the first member does not include the second member. Therefore, it is possible to further suppress the deterioration of the weighing accuracy due to the bending of the weighing platform.

(3) Preferably, the weighing device further includes a second member interposed between the first member and the weighing base and extending in the lateral direction. The distance between the central axis of the load cell and the portion where the weighing platform and the second member contact when a load is applied to the weighing platform is equal to the central edge of the weighing platform of the first member. , smaller than the distance from the central axis.

When a load is applied to the weighing platform and the weighing platform bends, the bottom surface of the weighing platform inclines downward as it progresses from the end of the weighing platform toward the center. If the first member does not have the second member, the weighing base abuts the first member at the center side edge of the weighing base of the first member. Therefore, the point of action of the force acting on the first member from the weighing platform is the central side edge of the first member. Here, the farther the force application point is from the central axis of the load cell, the larger the moment of the force and the larger the error appearing in the output of the load cell. According to the above configuration, the distance between the central axis of the load cell and the portion where the weighing platform and the second member come into contact when a load is applied to the weighing platform is smaller than the distance between the edge and the central axis. As a result, a smaller moment of force is generated when the first member includes the second member than when the first member does not include the second member. Therefore, it is possible to further suppress the deterioration of the weighing accuracy due to the bending of the weighing platform.

(4) Preferably, the width of the second member is smaller than the width of the first member.

(5) Preferably, the upper surface of the second member is curved.

According to the above configuration, the upper surface of the second member that contacts the weighing platform is curved. Therefore, when a load is applied to the weighing platform and the weighing platform bends, the point of contact between the weighing platform and the second member continuously moves along the curved surface. As a result, it is possible to prevent the weighing platform supported by the first member from becoming unstable.

(6) Preferably, the second member is arranged on the upper surface of the first member at the center of the weighing platform in the longitudinal direction.

(7) Preferably, the second member is arranged so as to overlap the central axis when viewed from above.

(8) Preferably, the weighing platform includes a third member that contacts the second member. The lower surface of the third member is located above the lower surface of the weighing platform.

According to the above configuration, the weighing platform contacts the second member on the lower surface of the third member located above the lower surface of the weighing platform. Therefore, the overall height of the weighing device can be reduced compared to the case where the lower surface of the weighing platform contacts the second member.

(9) Preferably, the weighing platform includes a third member, the second member is attached to the lower surface of the third member, and the lower surface of the second member is positioned above the lower surface of the weighing platform. do.

According to the above configuration, the second member interposed between the first member and the scale is attached to the lower surface of the third member. The bottom surface of the second member is located above the bottom surface of the weighing platform. Therefore, the total height of the weighing device can be reduced compared to the case where the weighing platform and the first member abut on the lower surface of the weighing platform.

(10) Preferably, the weighing platform includes a third member that contacts the first member, and the lower surface of the third member is located above the lower surface of the weighing platform.

According to the above configuration, the weighing platform contacts the first member on the lower surface of the third member located above the lower surface of the weighing platform. Therefore, the overall height of the weighing device can be reduced compared to the case where the lower surface of the weighing platform contacts the first member.

(11) Preferably, a fourth member that contacts the load cell is further interposed between the first member and the load cell. The bottom surface of the fourth member is located above the bottom surface of the first member.

According to the above configuration, the first member contacts the load cell on the lower surface of the fourth member located above the lower surface of the first member. Therefore, the total height of the weighing device can be reduced compared to the case where the lower surface of the first member contacts the load cell.

(12) Preferably, between the first member and the load cell, a fourth member abutting against the load cell and supporting the fourth member in a state in which the vertical position of the fourth member is adjustable. A support mechanism is also interposed. The support mechanism includes a female thread provided on one of the first member and the fourth member, and a male thread provided on the other of the first member and the fourth member and screwed into the female thread. be.

According to the above configuration, the vertical position of the fourth member can be adjusted by the support mechanism composed of the female screw and the male screw, so that the weighing platform can be easily horizontally adjusted.

(13) Preferably, the weighing device further includes a coupling mechanism that couples the weighing platform and the first member in a relatively movable state.

According to the above configuration, since the coupling mechanism that couples the weighing platform and the first member in a relatively movable state is provided, deterioration of weighing accuracy is suppressed compared to the case where the weighing platform is fixed to the first member. At the same time, the weighing platform and the first member can be integrated to improve maintainability.

Advantageous Effects of Invention According to the present invention, it is possible to realize a weighing apparatus that suppresses deterioration in weighing accuracy due to bending of a weighing platform.

3 is a right side view of the truck scale 100; FIG. 4 is a top view of the truck scale 100; FIG. 1 is a front view of a truck scale 100; FIG. 5 is a side view of the load cell 50; FIG. 4 is a front view of the load cell 50; FIG. 4 is a top view of the front end of the weighing platform 10. FIG. FIG. 7 is a diagram showing a state in which the weighing platform 10 is flexed in the truck scale 100 including the flexure effect prevention plate 70 ; FIG. 7 is a diagram showing a state in which the weighing platform 10 is flexed in the truck scale 100 that does not include the flexure effect prevention plate 70. FIG. 4 is a partial cross-sectional view showing the structure of the support mechanism 5; FIG. 4 is a cross-sectional view showing the structure of a coupling mechanism 6; FIG. FIG. 10 is a diagram showing a state in which the weighing platform 10 is flexed in the truck scale 100 including the flexure effect prevention plate 70 according to the modification.

Preferred embodiments of the present invention will now be described with reference to the drawings as appropriate. The present embodiment is merely one aspect of the present invention, and it goes without saying that the aspects may be changed without changing the gist of the present invention.

[Outline configuration and features]

In this embodiment, the truck scale 100 shown in FIG. 1 will be described. A truck scale 100 is installed on the base surface 1 . A truck scale 100 includes a weighing platform 10 , a pair of supports 30 and four load cells 50 . The weighing platform 10 has a rectangular flat plate shape, and a load is applied to the upper surface 11 thereof. The support portion 30 extends in the left-right direction 9 and abuts the weighing platform 10 from below to support the weighing platform 10 . The load cell 50 is arranged between the base surface 1 and the support portion 30 and is in contact with the support portion 30 from below to support the support portion 30 . The features of this embodiment are that the truck scale 100 includes the supporting portion 30 and the bending effect prevention plate 70 interposed between the supporting portion 30 and the weighing platform 10. . Truck scale 100 is an example of a weighing device described in the claims. The support part 30 is an example of the first member described in the claims. The deflection effect prevention plate 70 is an example of the second member described in the claims.

In the following description, the horizontal direction in FIG. 1 is the front-rear direction 8 of the track scale 100, and the vertical direction in FIG. The left-right direction 9 (see FIG. 2) of the truck scale 100 is the left-right direction when the truck scale 100 is viewed from the front.

[Weighing table 10]
As shown in FIG. 1, the weighing platform 10 is placed with its upper surface 11 horizontal. A vehicle (not shown) as an object to be weighed is placed on the upper surface 11 of the weighing platform 10 . The weighing platform 10 is rectangular in top view. The weighing platform 10 is arranged in a posture in which the longitudinal direction coincides with the front-rear direction 8 and the lateral direction coincides with the left-right direction 9 . The longitudinal dimension (length) of the weighing platform 10 is greater than the lateral dimension (width) of the weighing platform 10 . For example, the weighing platform 10 has a length of about 8m and a width of about 3m. The front-rear direction 8 is an example of the longitudinal direction of the scale. The lateral direction 9 is an example of the lateral direction of the weighing platform.

As shown in FIGS. 1 to 3, the weighing platform 10 includes eight main girders 12, six horizontal girders 13, a floor slab 14, a pair of side plates 15, a pair of top plates 16, and four reinforcing plates 17 .

As shown in FIG. 3, the main girder 12 is, for example, an H-rope (or I-rope). As shown in FIGS. 2 and 3, the eight main girders 12 are arranged parallel to each other in a posture in which the flange portions are arranged vertically and in a posture extending along the front-rear direction 8. .

As shown in FIG. 1, the crossbeam 13 is, for example, a rectangular plate when viewed from above. As shown in FIGS. 1 and 2 , the crossbeams 13 are arranged parallel to each other in a posture extending along the left-right direction 9 . As shown in FIG. 2, one transverse girder 13 is arranged below the lower flanges of the four main girders 12 and is joined to the four main girders 12 . The four main girders 12 on the right side and the four main girders 12 on the left side are joined to each other by three horizontal girders 13, respectively.

A floor slab 14 is placed on the main girder 12 . The floorboard 14 is a rectangular plate when viewed from above. The top surface of the floor board 14 is the top surface 11 of the weighing platform 10 . The lower surface of the main girder 12 , that is, the lower surface of the lower flange portion of the main girder 12 is the lower surface 18 of the weighing platform 10 .

The pair of side plates 15 shown in FIGS. 1, 2, and 4 are rectangular plate-shaped members, the longitudinal direction of which corresponds to the horizontal direction 9 and the lateral direction of which corresponds to the vertical direction 7. Placed in posture. The forward side plate 15 shown in FIG. 4 is joined to the forward end of the main girder 12 . A rear side plate 15 is joined to the rear end of the main girder 12 . The upper surface of the side plate 15 is flush with the upper surface of the floorboard 14 .

The pair of upper plates 16 shown in FIGS. 1, 2, and 4 are rectangular plate-like members, the longitudinal direction of which corresponds to the left-right direction 9, and the short direction of which corresponds to the front-to-rear direction 8. It is placed in the posture to The front top plate 16 shown in FIG. 4 is joined to the front face of the front side plate 15 . The rear upper plate 16 is joined to the rear surface of the rear side plate 15 . The upper surface of the upper plate 16 is flush with the upper surface of the side plate 15 and the upper surface of the floorboard 14 . As shown in FIG. 4 , the bottom surface 19 of the top plate 16 is located above the bottom surface 18 of the weighing platform 10 . The upper plate 16 is formed with through holes 20 into which bolts 81 of the coupling mechanism 6, which will be described later, are inserted. The upper plate 16 is an example of a third member.

The four reinforcing plates 17 shown in FIGS. 2 to 4 are roughly triangular plate-shaped members, one side of which is joined to the lower surface of the upper plate 16 and the other side of which is joined to the side surface of the side plate 15. . As shown in FIG. 2 , two reinforcing plates 17 are arranged at both ends of the front upper plate 16 in the left-right direction 9 and joined to the lower surface of the upper plate 16 and the front surfaces of the side plates 15 . Two reinforcing plates 17 are arranged at both ends in the left-right direction 9 of the rear upper plate 16 and joined to the lower surface of the upper plate 16 and the rear surface of the side plate 15 .

[Support portion 30]
As shown in FIGS. 1 to 3, the support part 30 is a generally prismatic member, and is arranged at the front end and the rear end of the weighing platform 10 in a posture extending in the left-right direction 9. be done. The weighing platform 10 is placed on the support portion 30 .

As shown in FIGS. 2 to 6, the support portion 30 includes a main member 31, a pair of side plates 32, a pair of upper plates 33, four reinforcing plates 34, and four brackets 45. A deflection effect prevention plate 70 is arranged on the upper surface 40 of the support portion 30 . The bracket 45 is an example of a fourth member.

As shown in FIG. 4, the main member 31 is, for example, an H-shaped rope (or an I-shaped rope). As shown in FIGS. 3 and 4 , the main member 31 is arranged in a posture in which the flange portions are arranged vertically and in a posture extending along the left-right direction 9 .

The pair of side plates 32 shown in FIGS. 3 and 4 are substantially square plate-shaped members, and are arranged in a posture in which one side thereof is aligned with the vertical direction 7 and the other side is aligned with the front-back direction 8. be. As shown in FIG. 3 , the right side plate 32 is joined to the right end of the main member 31 . The left side plate 32 is joined to the left end of the main member 31 . The upper surface of the side plate 32 is flush with the upper surface of the main member 31 .

The pair of upper plates 33 shown in FIGS. 3 and 4 are generally square plate-shaped members, and are arranged in a posture in which one side thereof coincides with the front-rear direction 8 and the other side coincides with the left-right direction 9. be done. As shown in FIG. 3 , the right upper plate 33 is joined to the right surface of the right side plate 32 . The left upper plate 33 is joined to the left surface of the left side plate 32 . The top surface of the upper plate 33 is flush with the top surface of the side plate 32 and the top surface of the main member 31 .

The reinforcing plate 34 shown in FIGS. 3, 4 and 6 is a plate-like member having one side joined to the lower surface of the upper plate 33 and the other side joined to the side surface of the side plate 32 . As shown in FIG. 3 , two reinforcing plates 34 are arranged at both ends in the left-right direction 9 of the front support portion 30 and joined to the lower surface of the upper plate 33 and the side surfaces of the side plates 32 . Two reinforcing plates 34 are arranged at both ends in the left-right direction 9 of the rear support portion 30 and joined to the lower surface of the upper plate 33 and the side surfaces of the side plates 32 .

The bracket 45 shown in FIGS. 3 and 4 is a substantially cylindrical member, and is arranged on the lower surface of the top plate 33 with its central axis aligned with the vertical direction 7 . The receiving metal fittings 45 are attached to the upper plate 33 via the support mechanism 5 which will be described later. The four receiving metal fittings 45 are attached to the pair of upper plates 33 of the front support portion 30 and the pair of upper plates 33 of the rear support portion 30, respectively. A lower surface 47 of the receiving metal fitting 45 contacts the upper surface of the load cell 50 . A lower surface 47 of the receiving metal fitting 45 is located above the lower surface of the support portion 30 .

[Load cell 50]
In this embodiment, the load cell 50 is a double-convex structure having a strain-generating body (not shown) having convex and spherical ends on both ends in the vertical direction 7 inside the cylindrical housing shown in FIG. type load cell. As shown in FIG. 4, the load cell 50 is provided between the receiving metal fittings 45 of the support portion 30 and the receiving metal fittings 60 fixed to the base surface 1. The lower surface 47 of the receiving metal fitting 45 abuts, and the lower surface of the load cell 50 (the end surface below the strain generating body) and the upper surface of the receiving metal fitting 60 abut against each other. In this embodiment, a straight line passing through the center of the spherical shape at both ends of the strain body in the vertical direction 7 is defined as the central axis 51 of the load cell 50 .

Both the lower surface 47 of the receiving metal fitting 45 and the upper surface of the receiving metal fitting 60 are flat surfaces. The receiving metal fitting 45 is arranged such that its lower surface is a horizontal surface. The receiving metal fitting 60 is arranged such that its upper surface is a horizontal plane. The upper and lower end faces of the load cell 50 movably contact the lower surface 47 of the receiving metal fitting 45 and the upper surface of the receiving metal fitting 60 .

The four load cells 50 are arranged below the receiving metal fittings 45 arranged at both ends in the left-right direction 9 of the front supporting part 30 and the receiving metal fittings arranged at both ends in the left-right direction 9 of the rear supporting part 30. . That is, the four load cells 50 are arranged below both ends in the left-right direction 9 of the front top plate 16 of the weighing platform 10 and both ends in the left-right direction 9 of the rear top plate 16 . Four receiving metal fittings 60 are arranged below the four load cells 50 in a state of being fixed to the base surface 1 .

The strain body of the load cell 50 is strained according to the load applied to the strain body. The load cell 50 outputs a load signal corresponding to the strain generated in the strain-generating body. Therefore, a plurality of strain gauges are attached to the strain generating body. This strain gauge constitutes a load detection circuit (for example, a Wheatstone bridge circuit) (not shown). The circuit outputs a load signal. The output load signal is input to a data processor (not shown). The data processor calculates the weight of the object to be weighed based on the load signals received from the four load cells 50 .

[Bending influence prevention plate 70]
The bending effect prevention plate 70 shown in FIGS. 4 to 6 is a rectangular plate-shaped member, and is in a posture in which its longitudinal direction corresponds to the left-right direction 9 and its short direction corresponds to the front-back direction 8. , are arranged on the upper surface 40 of the support 30 . When the weighing platform 10 is placed on the support section 30 , the deflection effect prevention plate 70 is arranged on the upper surface 40 of the support section 30 in front and the upper surface 40 of the support section 30 in the rear. In other words, the bending effect prevention plate 70 is joined to the upper surfaces of the main member 31 , the side plate 32 and the upper plate 33 of the support portion 30 . The deflection effect prevention plate 70 is interposed between the support portion 30 and the weighing platform 10 .

As shown in FIGS. 4 and 6, the width of the bending effect prevention plate 70 (the dimension in the front-rear direction 8) is smaller than the width of the support portion 30 (the dimension in the front-rear direction 8). The bending effect prevention plate 70 is arranged at the center of the support portion 30 in the front-rear direction 8 . As shown in FIG. 6, the bending influence prevention plate 70 is arranged in a state of overlapping with the central axis 51 of the load cell 50 when viewed from above.

With reference to FIG. 4, the deflection effect prevention plate 70 that is arranged on the upper surface 40 of the front support portion 30 and positioned forward of the center of the weighing platform 10 will be described below. The distance between the rear edge 71 of the bending effect prevention plate 70 and the central axis 51 of the load cell 50 is defined as D1. The distance between the rear edge 35 of the support portion 30 and the central axis 51 of the load cell 50 is defined as D2. In this embodiment, distance D1 is smaller than distance D2. The edge 71 is an example of the center side edge of the weighing platform of the second member. The edge 35 is an example of the central side edge of the weighing platform of the first member.

FIG. 7 shows a state in which an object to be weighed is placed on the weighing platform 10 and the weighing platform 10 is bent. Due to the bending of the weighing platform 10, the upper plate 16 of the weighing platform 10 is inclined. As a result, the top plate 16 of the weighing platform 10 and the deflection effect prevention plate 70 come into contact with each other at the edge 71 of the deflection effect prevention plate 70 . Then, the edge 71 is the point of action of the force F1 acting on the support portion 30 from the weighing platform 10 via the bending effect prevention plate 70 . The distance between the edge 71 where the force F1 acts and the central axis 51 of the load cell 50 is D1. Therefore, the magnitude of the moment caused by the force F1 is F1×D1. The edge 71 is an example of a portion where the weighing platform and the second member come into contact when a load is applied to the weighing platform.

Here, a case where the track scale 100 does not include the deflection effect prevention plate 70 will be considered. FIG. 8 shows a state in which an object to be weighed is placed on the weighing platform 10 and the weighing platform 10 is bent. Since the upper plate 16 of the weighing platform 10 is tilted, the upper plate 16 of the weighing platform 10 and the supporting portion 30 come into contact with each other at the edge 35 of the supporting portion 30 . Then, the point of action of the force F2 acting on the support portion 30 from the weighing platform 10 is the edge 35. As shown in FIG. The distance between the edge 35 where the force F2 acts and the central axis 51 of the load cell 50 is D2. Therefore, the magnitude of the moment caused by force F2 is F2×D2. In this embodiment, distance D1 is smaller than distance D2. Therefore, if the force F1 and the force F2 are of the same magnitude, the case where the bending effect prevention plate 70 is provided (FIG. 7) is better than the case where the bending effect prevention plate 70 is not provided (FIG. 8). , the resulting moment becomes smaller.

As described above, the deflection effect prevention plate 70 positioned forward of the center of the weighing platform 10 shown in FIG. 4 has been described. . The distance between the front edge of the bending effect prevention plate 70 and the center axis of the load cell 50 is smaller than the distance between the front edge of the support portion 30 and the center axis of the load cell 50 . That is, the distance between the central edge of the weighing platform 10 and the central axis of the load cell 50 of the bending effect prevention plate 70 is equal to the distance between the central edge of the weighing platform 10 and the load cell 50 less than the distance from the central axis of

[Support Mechanism 5]
The support mechanism 5 will be described with reference to FIG. The support mechanism 5 is a mechanism that supports the metal fitting 45 in a state in which the position of the metal fitting 45 in the vertical direction 7 can be adjusted. The support mechanism 5 is composed of a female thread 36 formed on the upper plate 33 of the support portion 30 and a male thread 46 formed on the outer surface of the bracket 45 . The female screw 36 is formed inside a hole 37 provided on the lower surface of the upper plate 33 . The female screw 36 of the upper plate 33 is screwed with the male screw 46 of the bracket 45 , and the bracket 45 is attached to the hole 37 of the upper plate 33 . When the receiving metal fitting 45 is rotated, the receiving metal fitting 45 moves in the vertical direction 7 with respect to the upper plate 33 . As a result, the vertical position of the bracket 45 is adjusted, and the weighing platform 10 is horizontally adjusted.

The support mechanism 5 further comprises a lock nut 55 and a set screw 56 . The lock nut 55 is screwed onto the male thread 46 of the receiving metal fitting 45 . After the position of the receiving metal fitting 45 is determined, the lock nut 55 is tightened toward the upper plate 33 . Thereby, the position of the receiving metal fitting 45 is fixed. The set screw 56 is attached to a threaded hole 57 provided in the lock nut 55 . When the lock nut 55 is tightened, the setscrew 56 is tightened and comes into contact with the bottom surface of the top plate 33 . As a result, loosening of the lock nut 55 is suppressed.

[Coupling mechanism 6]
The coupling mechanism 6 will be described with reference to FIG. The coupling mechanism 6 is a mechanism that couples the weighing platform 10 and the support section 30 in a relatively movable state. In this embodiment, two coupling mechanisms 6 are provided at both ends in the left-right direction 9 of the front top plate 16 . Two coupling mechanisms 6 are provided at both ends in the left-right direction 9 of the rear top plate 16 .

The coupling mechanism 6 is composed of bolts 81 , bosses 82 and nuts 83 . The boss 82 is a cylindrical member. The boss 82 is inserted into the hole 38 of the upper plate 33 from above. The nut 83 is inserted into the hole 39 of the upper plate 33 from below. A bolt 81 is inserted from above into the through hole 20 of the upper plate 16 and is screwed with a nut 83 . As a result, the weighing platform 10 and the supporting portion 30 are joined together, and the weighing platform 10 and the supporting portion 30 are integrated. For example, when the weighing platform 10 is lifted upward, the support part 30 is lifted upward together with the weighing platform 10 .

Here, the outer diameter of boss 82 is smaller than the inner diameter of hole 38 . As a result, the weighing platform 10 can move in the left-right direction 9 and the front-rear direction 8 with respect to the support portion 30 . In addition, the top plate 16 of the weighing platform 10 can be tilted with respect to the top plate 33 of the supporting portion 30 even when an object to be weighed is placed on the weighing platform 10 and bent.

[Modification 1]
In the above-described embodiment, an example in which the bending effect prevention plate 70 is a rectangular plate-like member has been described. In this modified example, an example in which the upper surface 72 of the bending effect prevention plate 70 is a curved surface will be described. Below, the same code|symbol is attached|subjected to the same structure as said embodiment, and description is abbreviate|omitted.

As shown in FIG. 11, the bending influence prevention plate 70 of this modified example is a rectangular plate-like member, and its upper surface 72 is formed in an arc shape. A vertex 73 of the arc-shaped upper surface 72 is at the same position as the central axis 51 of the load cell 50 in the front-rear direction 8 .

FIG. 11 shows a state in which an object to be weighed is placed on the weighing platform 10, the weighing platform 10 is bent, and the upper plate 16 of the weighing platform 10 is tilted. At this time, the top plate 16 of the weighing platform 10 and the deflection effect prevention plate 70 come into contact at a point 74 located between the edge 71 and the vertex 73 . Then, the point of action of the force F3 acting on the support portion 30 from the weighing platform 10 via the bending effect prevention plate 70 is the point 74 . Let D3 be the distance between the point 74 where the force F3 acts and the central axis 51 of the load cell 50 . The magnitude of the moment caused by force F3 is F3×D3. The distance D3 is smaller than the distance D1 (the distance between the edge 37 and the central axis 51). Therefore, if the force F1 and the force F2 are of the same magnitude, the upper surface of the bending effect preventing plate 70 is curved compared to the case where the upper surface 72 of the bending effect preventing plate 70 is flat (embodiment, FIG. 7). In the case of (this modification, FIG. 11), the generated moment becomes smaller. A point 74 is an example of a portion where the weighing platform and the second member come into contact when a load is applied to the weighing platform.

In this modified example, the example in which the entire upper surface 72 of the bending effect prevention plate 70 is formed in an arc shape has been described, but the upper surface 72 may be a curved surface other than an arc. Moreover, a part of the upper surface 72 may be formed in an arc shape.

[Modification 2]
In the above embodiment, an example was described in which the bending effect prevention plate 70 is a member attached to the upper surface of the support portion 30 . A deflection effect prevention plate 70 may be attached to the lower surface 18 of the weighing platform 10 and interposed between the weighing platform 10 and the support 30 . Specifically, the deflection effect prevention plate 70 may be attached to the lower surface 19 of the upper plate 16 of the weighing platform 10 and interposed between the weighing platform 10 and the support section 30 . In this case, the lower surface of the bending effect prevention plate 70 is positioned above the lower surface 18 of the weighing platform 10 .

[Modification 3]
In the above embodiment, an example in which the deflection effect prevention plate 70 is interposed between the support portion 30 and the weighing platform 10 has been described. Alternatively, the support portion 30 may directly support the weighing platform 10 . Specifically, the upper plate 33 of the support portion 30 may contact the lower surface 19 of the upper plate 16 of the weighing platform 10 from below. The lower surface 19 of the upper plate 16 of the weighing platform 10 is located above the lower surface 18 of the weighing platform 10 .

[Other Modifications]
In the above embodiment, an example was described in which the bending effect prevention plate 70 is a continuous member from the left end to the right end of the support portion 30 . The bending effect prevention plate 70 may be a member divided into a plurality of pieces in the left-right direction 9 .

In the above embodiment, an example in which the bending effect prevention plate 70 is arranged at the center of the support portion 30 in the front-rear direction 8 has been described. The deflection effect prevention plate 70 may be arranged offset from the center of the support portion 30 in the front-rear direction 8 . For example, the deflection effect prevention plate 70 is offset toward the end of the weighing platform 10 in the front-to-rear direction 8 so that the load cell 50 is positioned between the edge 71 of the deflection effect prevention plate 70 and the edge 35 of the support 30 . A central axis 51 may be located. For example, the deflection effect prevention plate 70 may be arranged at a position where the edge 71 of the deflection effect prevention plate 70 and the center axis 51 of the load cell 50 match when viewed from above.

In the above embodiment, an example was described in which the coupling mechanism 6 couples the top plate 16 of the weighing platform 10 and the top plate 33 of the support portion 30 . A configuration in which the connecting mechanism 6 connects the side plate 15 of the weighing platform 10 and the reinforcing plate 34 of the support portion 30 is also possible. That is, it is also possible for the bolt 81 of the coupling mechanism 6 to extend along the front-rear direction 8 .

In the above embodiment, an example in which the receiving metal fitting 45 is attached to the upper plate 33 of the support portion 30 via the support mechanism 5 has been described. A receiving metal fitting 45 may be attached to the weighing platform 10 via the support mechanism 5 . In other words, a configuration in which the truck scale 100 does not include the support portion 30 is also possible. In this embodiment, the truck scale 100 installed on the base surface 1 has a rectangular flat plate shape, and is arranged between the weighing base 10 to which a load is applied to the upper surface 11 and the base surface 1 and the weighing base 10, A load cell 50 is provided which abuts on the weighing platform 10 from below to support the weighing platform 10 . Further interposed between the weighing platform 10 and the load cell 50 are a receiving metal fitting 45 that abuts on the load cell 50, and a support mechanism 5 that supports the receiving metal fitting 45 in a state in which the position of the receiving metal fitting 45 in the vertical direction 7 is adjustable. be done.

DESCRIPTION OF SYMBOLS 1... Base surface 5... Support mechanism 6... Coupling mechanism 10... Weighing platform 16... Upper plate (third member)
30... support portion (first member)
45... Receiving bracket (fourth member)
50... Load cell 51... Center shaft 70... Bending influence prevention plate (second member)
100... Truck scale (weighing device)

Claims (12)

A weighing device installed on a foundation surface,
a weighing platform having a rectangular plate shape and having a load applied to its upper surface;
a first member extending in the lateral direction of the weighing platform and supporting the weighing platform;
a load cell disposed between the base surface and the first member and supporting the first member;
a second member interposed between the first member and the weighing platform and extending in the lateral direction ;
The distance between the central edge of the weighing platform of the second member and the central axis of the load cell is
A weighing device , wherein the distance between the central edge of the weighing platform of the first member and the central axis is smaller. A weighing device installed on a foundation surface,
a weighing platform having a rectangular plate shape and having a load applied to its upper surface;
a first member extending in the lateral direction of the weighing platform and supporting the weighing platform;
a load cell disposed between the base surface and the first member and supporting the first member;
a second member interposed between the first member and the weighing platform and extending in the lateral direction;
The distance between the portion of contact between the weighing platform and the second member when a load is applied to the weighing platform and the center axis of the load cell is
A weighing device, wherein the distance between the central edge of the weighing platform of the first member and the central axis is smaller. The width of the second member is smaller than the width of the first member
Weighing device according to claim 1 or 2 . The upper surface of the second member is curved.
Weighing device according to any one of claims 1 to 3 . The second member is arranged at the center of the weighing platform in the longitudinal direction on the upper surface of the first member.
Weighing device according to any one of claims 1 to 4 . The second member is arranged so as to overlap the central axis when viewed from above.
Weighing device according to any one of claims 1 to 5 . The weighing platform includes a third member that contacts the second member,
The lower surface of the third member is located above the lower surface of the weighing platform.
Weighing device according to any one of claims 1 to 6 . The weighing platform comprises a third member,
The second member is attached to the lower surface of the third member,
The lower surface of the second member is located above the lower surface of the weighing platform.
Weighing device according to any one of claims 1 to 6 . The weighing platform includes a third member that contacts the first member,
2. The weighing apparatus according to claim 1, wherein the lower surface of said third member is located above the lower surface of said weighing platform. A fourth member that contacts the load cell is further interposed between the first member and the load cell,
The bottom surface of the fourth member is located above the bottom surface of the first member.
Weighing device according to any one of claims 1 to 9 . Between the first member and the load cell,
a fourth member that contacts the load cell;
a support mechanism for supporting the fourth member in a state in which the vertical position of the fourth member can be adjusted;
The support mechanism includes a female thread provided on one of the first member and the fourth member, and a male thread provided on the other of the first member and the fourth member and screwed into the female thread. Ru
Weighing device according to any one of claims 1 to 9 . Further comprising a coupling mechanism that couples the weighing platform and the first member in a relatively movable state.
Weighing device according to any one of claims 1 to 11 .

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