CN219842048U

CN219842048U - Weighing sensor

Info

Publication number: CN219842048U
Application number: CN202320568197.3U
Authority: CN
Inventors: 金涛; 黄瑞麒; 宋浩
Original assignee: Beijing Wanji Technology Co Ltd
Current assignee: Beijing Wanji Technology Co Ltd
Priority date: 2023-03-21
Filing date: 2023-03-21
Publication date: 2023-10-17
Anticipated expiration: 2033-03-21

Abstract

The utility model discloses a weighing sensor, comprising: a carrying plate; the support plate is positioned below the bearing plate and is arranged at intervals with the bearing plate; the connecting parts are connected between the bearing plate and the supporting plate, are arranged at intervals along the length direction of the bearing plate, and comprise upright posts, and two ends of each upright post are respectively connected with the bearing plate and the supporting plate; and at least one group of strain gauges are arranged on each upright post, and the at least one group of strain gauges form a Wheatstone bridge. The weighing sensor provided by the utility model is a narrow-strip strain type weighing sensor for measuring the load by splicing a plurality of groups of column type normal stress structures, has a faster dynamic response speed, and can improve the signal authenticity and effectiveness under high-speed load, thereby improving the high-speed dynamic weighing precision.

Description

Weighing sensor

Technical Field

The utility model relates to the field of vehicle weighing, in particular to a weighing sensor.

Background

Road transportation is a common transportation mode and has the advantages of convenience and rapidness. In order to ensure the safety of road transportation and prolong the service life of the road, the transportation vehicles running on the road are strictly forbidden to be overloaded. In the off-site law enforcement of overload highway governance, accurate information such as the axle number, the speed and the axle weight of a transport vehicle needs to be scientifically obtained to be used as a high-speed dynamic weighing basis.

In the related art, a bending plate type weighing sensor and a piezoelectric type weighing sensor are commonly used weighing sensors in a high-speed dynamic weighing system. Wherein, the bent plate type weighing sensor has large impact force to the weighing body by the vehicle at high speed due to large width of the weighing platform, and has relatively low reliability and service life. The piezoelectric weighing width is narrower, generally within 10cm, the high-speed impact is small, the service life is relatively high, and the piezoelectric weighing device is a current general high-speed dynamic weighing mode. However, due to the principle characteristics of the piezoelectric effect of the quartz crystal, the piezoelectric type dynamic weighing device has poor dynamic weighing precision in an ultra-low speed state, and cannot independently identify the position and the tire type of the wheel.

The narrow-strip strain sensor currently existing in the market can basically solve the problems, but the situation that a load signal is lagged or lost possibly occurs exists, so that weighing precision is affected.

Disclosure of Invention

The embodiment of the utility model provides a narrow-strip strain type weighing sensor for measuring loads by splicing a plurality of groups of positive stress structures, so as to improve dynamic weighing precision.

According to one aspect of the present utility model, there is provided a load cell comprising: a carrying plate; the support plate is positioned below the bearing plate and is arranged at intervals with the bearing plate; the connecting parts are connected between the bearing plate and the supporting plate, are arranged at intervals along the length direction of the bearing plate, and comprise upright posts, and two ends of each upright post are respectively connected with the bearing plate and the supporting plate; and at least one group of strain gauges are arranged on each upright post, and the at least one group of strain gauges form a Wheatstone bridge.

Further, each group of strain gage comprises at least two strain gages, and each group of strain gage is symmetrically arranged on the upright post.

Further, each connecting portion further comprises a first protective cover arranged on the outer side of the upright post.

Further, the first shield comprises two side wall sections arranged opposite to each other, and the side wall sections comprise folded plates or arc plates.

Further, the connection portion further includes a first filling structure filled between the first shield and the pillar.

Further, the bearing plate, the supporting plate, the upright post and the first protective cover are of an integrated structure.

According to another aspect of the present utility model, there is provided a load cell comprising: a carrying plate; the support plate is positioned below the bearing plate and is arranged at intervals with the bearing plate; the connecting parts are connected between the bearing plate and the supporting plate, are arranged at intervals along the length direction of the bearing plate, and comprise a second protective cover and a cross rod arranged in the second protective cover, and the second protective cover is connected with the bearing plate and the supporting plate; and at least one group of strain gauges are arranged on each cross rod, and the at least one group of strain gauges form a Wheatstone bridge.

Further, each set of strain gages comprises at least two strain gages, and each set of strain gages is symmetrically arranged along the rail.

Further, the connection portion further includes a second filling structure filled between the second shield and the cross bar.

Further, the second protective cover is symmetrically arranged relative to a preset horizontal plane, and the preset horizontal plane is equal to the distance between the bearing plate and the supporting plate.

By applying the technical scheme of the utility model, the weighing sensor comprises the bearing plate, the supporting plate, the plurality of connecting parts and the plurality of groups of strain gauges, when a high-speed vehicle passes through the weighing sensor, load borne by the bearing plate can be transferred to the plurality of connecting parts connected between the bearing plate and the supporting plate, each connecting part comprises the upright post or comprises the second protective cover and the cross rod arranged in the second protective cover, the plurality of deformation parts can generate tensile deformation or compressive deformation due to the pressure of the load, and further generate tensile stress or compressive stress, and the group of strain gauges arranged on the upright post or the cross rod detect the compressive strain or the tensile strain of the upright post or the cross rod, and as at least one group of strain gauges can form a Wheatstone bridge, the load information borne by the bearing plate can be converted into electric signals to be output. Because the strain gauge is used for directly measuring the tensile stress or the compressive stress generated by the deformation part under the action of the load, compared with a strain type narrow-strip sensor for measuring the shear stress in the related art, the dynamic response of the strain type narrow-strip sensor is quicker, the problem of high-speed load signal lag or loss can be effectively avoided, the signal authenticity and the effectiveness under the high-speed load are improved, and the high-speed dynamic weighing precision is further improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 illustrates a front view of a load cell provided in accordance with a first embodiment of the present utility model;

FIG. 2 shows a schematic perspective view of a partial structure of the load cell of FIG. 1;

FIG. 3 shows a partial view of the load cell of FIG. 1;

FIG. 4 shows a cross-sectional view of the load cell of FIG. 1;

FIG. 5 is a front view of a load cell according to a second embodiment of the present utility model;

FIG. 6 shows a partial view of the load cell of FIG. 5;

FIG. 7 shows a schematic perspective view of a partial structure of the load cell of FIG. 5;

FIG. 8 is a front view of a load cell according to a third embodiment of the utility model;

FIG. 9 is a schematic perspective view showing a partial structure of the load cell of FIG. 8;

fig. 10 shows a layout of the load cell of fig. 8.

Wherein the above figures include the following reference numerals:

10. a carrying plate;

20. a support plate;

30. a connection part; 31. a column; 32. a first shield; 321. a sidewall section; 33. a second shield; 34. a cross bar;

40. strain gage.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 1 to 4, a first embodiment of the present utility model provides a weighing sensor, which includes a carrier plate 10, a support plate 20, a plurality of connecting portions 30 and a plurality of groups of strain gauges 40, wherein the support plate 20 is located below the carrier plate 10 and is spaced apart from the carrier plate 10; each of the connection parts 30 is connected between the carrier plate 10 and the support plate 20, and the plurality of connection parts 30 are arranged at intervals along the length direction of the carrier plate 10; each connecting portion 30 comprises an upright 31, two ends of the upright 31 are respectively connected with the bearing plate 10 and the supporting plate 20, at least one group of strain gauges 40 are arranged on each upright 31, and at least one group of strain gauges 40 form a Wheatstone bridge.

According to the first embodiment, the load cell includes the carrier plate 10, the support plate 20, the plurality of connection portions 30 and the plurality of groups of strain gauges 40, when the high-speed vehicle passes through the load cell, the load carried by the carrier plate 10 can be transferred to the plurality of connection portions 30 connected between the carrier plate 10 and the support plate 20, each connection portion 30 includes the upright post 31, the plurality of upright posts 31 can generate compression deformation due to the pressure of the load, the strain gauges 40 arranged on the upright posts 31 detect the compression strain of the upright posts 31, and as at least one group of strain gauges 40 can form a wheatstone bridge, the load information carried by the carrier plate 10 is converted into electrical signals to be output. Because the compressive stress generated by the upright column 31 under the action of the load is directly measured through the strain gauge 40, compared with the strain type narrow strip sensor for measuring the shear stress in the related art, the dynamic response of the weighing sensor is quicker, the signal authenticity and the effectiveness under the high-speed load can be improved, and the high-speed dynamic weighing precision is further improved.

It should be noted that, each set of strain gage 40 includes at least two strain gages 40, and the manner in which the plurality of strain gages 40 form a wheatstone bridge may be varied. Specifically, the strain gauge 40 on each connection portion 30 may form a wheatstone bridge, and in this case, 2 strain gauges 40 may be disposed on each connection portion 30, and the two strain gauges 40 are formed by connecting with external 2 standard resistors. Of course, the strain gage 40 on the adjacent two or more connecting portions 30 may form a wheatstone bridge. In the utility model, a plurality of Wheatstone bridges are formed, and the Wheatstone bridges are led out from the weighing sensor and connected with external equipment. The way the wheatstone bridge is led out and the way it is connected to an external device can be realized with reference to the prior art.

In the related art, the narrow-strip strain sensor of the shear beam structure has slower response to high-speed load, the response speed is thousands of Hz, and the dynamic response of the weighing sensor is faster, so that tens of thousands to hundreds of thousands of Hz can be achieved.

As shown in fig. 3 and 4, each set of strain gages 40 is symmetrically disposed on the post 31. Preferably, the line connecting the centers of the two strain gauges 40 is disposed in parallel with the width direction of the carrier plate 10. With the above structure, there is an advantage in that the operator can conveniently arrange the strain gauge 40.

In the present embodiment, two strain gages 40 are provided on both sides of the column 31, respectively, in the width direction of the carrier plate 10. In the case where the single post 31 forms a wheatstone bridge, two strain gages 40 need to be used with 2 resistors.

As shown in fig. 1 and 2, each connection portion 30 further includes a first shield 32 disposed outside the column 31. The center line of the first protection cover 32 is disposed parallel to the width direction of the carrier plate 10, and the first protection cover 32 may be disposed symmetrically with respect to a preset horizontal plane, which is equal to the distance between the carrier plate 10 and the support plate 20. The first protection cover 32 is adopted to form protection for the upright posts 31 so as to prevent the upright posts 31 from being damaged. Also, the ability of the upright 31 to resist side loads can be improved with the first shield 32.

In this embodiment, the upright 31 is disposed vertically within the first shield 32, and the centerline of the upright 31 coincides with the vertical centerline of the first shield.

Wherein, in the width direction of the loading plate 10, both ends of the first protection cover 32 are of an opening structure, which is arranged to facilitate the arrangement of the strain gauge 40. The opening is provided with a cover structure, and the end opening of the first protection cover 32 can be closed by using the cover structure, so that the strain gauge 40 and the circuit inside can be better protected.

Specifically, the connection part 30 further includes a first filling structure filled between the first shield 32 and the column 31. The first filling structure can be used for waterproof and buffering protection of the strain gauge 40 and the circuit of the weighing sensor so as to prolong the service life of the weighing sensor.

In this embodiment, glue is used to fill between the first protection cover 32 and the upright 31, and the glue is made of silica gel or rubber.

It should be noted that, the widths of the carrier plate 10 and the support plate 20 are substantially equal, and the dimension of the upright post 31 along the width direction of the carrier plate 10 is smaller than the width of the carrier plate 10.

As shown in fig. 1-3, the first shield 32 includes two sidewall segments 321 disposed opposite each other. Each sidewall section 321 may be symmetrically disposed with respect to a predetermined horizontal plane, and the sidewall sections 321 include flaps or arc-shaped plates. The first protective cover 32 adopting the structure has the advantages of simple structure and convenient arrangement.

In this embodiment, the sidewall section 321 adopts an arc-shaped plate structure, and the arc-shaped plate is connected with the carrier plate 10 and the support plate 20 in a circular arc transition manner, which has the advantage of convenient processing.

The bearing plate 10, the support plate 20, the upright posts 31 and the first protection cover 32 are integrally formed. By adopting the integrated structure, the processing device has the advantage of being convenient to process. In this embodiment, the bearing plate 10, the support plate 20, the upright posts 31 and the first protection cover 32 are all made of alloy steel, so that the load bearing capacity and the deformation capacity of the bearing plate can be improved, and the service life of the bearing plate can be prolonged.

As shown in fig. 5 to 7, in the second embodiment of the present utility model, each of the connection parts 30 includes a second shield 33 and a cross bar 34 disposed in the second shield 33, the second shield 33 is connected with the carrier plate 10 and the support plate 20, the center line of the second shield 33 may be disposed parallel to the width direction of the carrier plate 10, the second shield 33 is symmetrically disposed with respect to a predetermined horizontal plane, the predetermined horizontal plane is equidistant from the carrier plate 10 and the support plate 20, and at least one set of strain gauges 40 are disposed on each of the cross bars 34. With the connection part 30 having the above structure, when a high-speed vehicle passes through the load cell, the cross bar 34 can be deformed in a stretching manner due to the pressure of the load, and further a tensile stress is generated, the strain gauge 40 detects the tensile stress of the cross bar 34, and the plurality of groups of strain gauges 40 can form a wheatstone bridge to convert the load information carried by the carrier plate 10 into an electrical signal for output.

Wherein a protective effect can be formed on the crossbar 34 by means of the second protective cover 33.

In the second embodiment, each set of strain gages 40 is symmetrically disposed along the crossbar 34. Preferably, the line connecting the centers of the two strain gauges 40 is disposed in parallel with the width direction of the carrier plate 10. With the above structure, there is an advantage in that the operator can conveniently arrange the strain gauge 40.

The cross bar 34 extends in a horizontal direction, and a center line of the cross bar 34 extends in a predetermined horizontal plane.

As shown in fig. 5 to 7, the cross section of the second shield 33 is circular, and the length of the cross bar 34 is equal to the inner diameter of the second shield 33. The second protection cover 33 and the cross bar 34 adopting the above structure have the advantage of convenient processing.

In the second embodiment, the connecting portion 30 further includes a second filling structure filled between the second shield 33 and the cross bar 34. The second filling structure can be used for waterproof and buffer protection of the strain gage 40 and the circuit of the weighing sensor so as to prolong the service life of the weighing sensor.

It should be noted that, the widths of the carrier plate 10 and the support plate 20 are substantially equal, and the dimension of the cross bar 34 along the width direction of the carrier plate 10 is smaller than the width of the carrier plate 10.

As shown in fig. 8 to 10, in the third embodiment of the present utility model, the inner diameter of the second protection cover 33 along the length direction of the carrier plate 10 is larger than the inner diameter of the second protection cover 33 along the up-down direction, and the length of the cross bar 34 is equal to the maximum inner diameter of the second protection cover 33 along the length direction of the carrier plate 10. With the above structure, when a high-speed vehicle passes through the load cell, the cross bar 34 can be deformed in tension due to the pressure of the load, and further tensile stress is generated. In the third embodiment, compared with the second embodiment, the second protection cover 33 has a larger inner diameter along the length direction of the carrier plate 10, so that the number of the strain gauges 40 can be reduced.

As shown in fig. 1, 5 and 8, the number of the connection portions 30 is greater than 2, the plurality of connection portions 30 are arranged at equal intervals, the width of the carrier plate 10 is between 3cm and 10cm, and may be 3cm, 5cm or 7cm, and the length is about 1 m. The above number of the connection parts 30 can improve the supporting effect between the carrier plate 10 and the supporting plate 20, so as to prevent the carrier plate 10 from being deformed due to too small number and interval of the connection parts 30, and the transverse consistency is not good.

Of course, the distances between the plurality of connection portions 30 may be different. The distances between the plurality of connection parts 30 are set according to circumstances.

Wherein, a plurality of connecting portions 30 are arranged at equal intervals, and the intervals are kept within a reasonable range. In the length direction of the bearing plate 10, the distance between every two adjacent connecting parts 30 is equal and the distance range is reasonable, so that the bearing plate 10 between every two adjacent connecting parts 30 is borne by the bearing plate 10, the bearing forces born by the bearing plate 10 are basically the same, and further the problem that the bearing plate 10 is too large in deformation due to too large distance between the adjacent connecting parts 30 can be avoided, and the overall supporting effect of the bearing plate 10 can be improved.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims

1. A load cell, comprising:

a carrier plate (10);

the support plate (20) is positioned below the bearing plate (10) and is arranged at intervals with the bearing plate (10);

a plurality of connection parts (30), each connection part (30) is connected between the bearing plate (10) and the supporting plate (20), the plurality of connection parts (30) are arranged at intervals along the length direction of the bearing plate (10), each connection part (30) comprises a stand column (31), and two ends of the stand column (31) are respectively connected with the bearing plate (10) and the supporting plate (20);

and the strain gauges (40) are arranged on each upright (31), at least one group of strain gauges (40) is arranged on each upright, and at least one group of strain gauges (40) form a Wheatstone bridge.

2. Load cell according to claim 1, wherein each set of said strain gauges (40) comprises at least two and wherein each set of said strain gauges (40) is symmetrically arranged on said upright (31).

3. Load cell according to claim 1, wherein each of said connection portions (30) further comprises a first protection cap (32) arranged outside said upright (31).

4. A load cell according to claim 3, wherein the first protective cover (32) comprises two side wall sections (321) arranged opposite each other, the side wall sections (321) comprising flaps or curved plates.

5. A load cell according to claim 3, wherein the connection (30) further comprises a first filling structure filling between the first protective cover (32) and the upright (31).

6. The load cell of claim 4 wherein said carrier plate (10), said support plate (20), said upright (31) and said first shield (32) are of unitary construction.

7. A load cell, comprising:

a carrier plate (10);

a plurality of connection parts (30), each connection part (30) is connected between the bearing plate (10) and the supporting plate (20), the plurality of connection parts (30) are arranged at intervals along the length direction of the bearing plate (10), each connection part (30) comprises a second protection cover (33) and a cross rod (34) arranged in the second protection cover (33), and the second protection cover (33) is connected with the bearing plate (10) and the supporting plate (20);

and a plurality of groups of strain gauges (40), wherein each transverse rod (34) is provided with at least one group of strain gauges (40), and at least one group of strain gauges (40) form a Wheatstone bridge.

8. Load cell according to claim 7, wherein each set of said strain gauges (40) comprises at least two and wherein each set of said strain gauges (40) is symmetrically arranged along said cross bar (34).

9. The load cell of claim 7, wherein said connection (30) further comprises a second filling structure filled between said second shield (33) and said cross bar (34).

10. The load cell of claim 7, wherein said second protective cover (33) is symmetrically arranged with respect to a predetermined horizontal plane, said predetermined horizontal plane being equidistant from said carrier plate (10) and said support plate (20).