CN211401386U

CN211401386U - Dynamic weighing sensor and dynamic weighing device

Info

Publication number: CN211401386U
Application number: CN202020471713.7U
Authority: CN
Inventors: 李小芳
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-02
Filing date: 2020-04-02
Publication date: 2020-09-01
Anticipated expiration: 2030-04-02

Abstract

The utility model provides a dynamic weighing sensor, including sensitive roof beam and sensing element, the vertical setting of sensitive roof beam, sensitive roof beam has a leading flank, a trailing flank, a left surface and a right flank, the leading flank is parallel with the trailing flank, and the left surface is parallel with the right flank, and the leading flank is perpendicular with the left surface, leading flank, trailing flank, left surface and right flank all are provided with sensing element. Also disclosed is a dynamic weighing apparatus comprising an upper support member, a lower support member and a plurality of dynamic weighing sensors. The utility model has the advantages of simple structure, the manufacturing degree of difficulty is lower, reduction in production cost. The output addition of 4 sensitive elements of each sensitive beam can automatically decouple the influence of braking force, transverse force and the like on output signals, and the accuracy of measurement is ensured. The sensitive beam has strong bearing capacity, and the sensitive element does not bear the weight, so that the sensitive element is prevented from being damaged due to compression.

Description

Dynamic weighing sensor and dynamic weighing device

Technical Field

The utility model belongs to the technical field of the dynamic weighing equipment and specifically relates to a dynamic weighing sensor and dynamic weighing device.

Background

The dynamic weighing device is mainly used for measuring the axle weight and the total weight of the vehicle in the driving process of the vehicle, and realizes the functions of automatically acquiring vehicle weight data to support traffic intelligent management planning, overload and overrun automatic detection, road weight-calculating charge and the like. But of course can be used for weighing other dynamic devices.

The current dynamic weighing device is mainly divided into two types, the first type is a narrow-strip quartz dynamic weighing sensor, the structure of the dynamic weighing device is integrally manufactured through a section bar process, and quartz piezoelectric sensitive elements are equidistantly arranged in the middle of the structure. When the wheel presses the sensor, the integrated structure bears a load with a fixed proportion, the residual load compresses the quartz piezoelectric sensitive element to generate a charge signal which is in a linear relation with the load, the charge signal is converted into a voltage signal through the charge amplifier, and the voltage signal is converted into a digital signal through the AD conversion at the rear end to realize data acquisition. Reference is made in particular to the patent application No. 201820663349.7 entitled "a weighing platform for dynamic measurement of vertical forces". The strip dynamic weighing sensor is generally small in height, and when the strip dynamic weighing sensor is installed, the strip dynamic weighing sensor is embedded in a road surface by a road surface groove, and the upper surface of the strip dynamic weighing sensor is flush with the ground. Since the bottoming length of the wheel is less than the sensor width, the output signal of the sensor actually reflects a portion of the weight of the wheel or axle weight. After the wheels completely drive the sensor, the output signals of the sensor are integrated to obtain wheel weight or axle weight data, and then all the wheel weight or axle weight data are summed to obtain total weight data. The dynamic weighing sensor has the disadvantages that due to the characteristic limitation of the piezoelectric quartz, when a vehicle passes through at a low speed, electric charge generated on the surface of the quartz cannot be kept for a long time, electric charge leakage can occur, measured data is inaccurate, the vibration interference characteristic in the running and weighing process of the vehicle cannot be acquired, and the measurement accuracy can be influenced by some means, for example, some freight drivers can escape detection through a steel plate with the width larger than the width of the sensor under the wheels.

The second type is a wide type, and the structure of the product mainly comprises an upper plate, a sensor and a lower plate. The sensor is arranged on the upper plate, and the axle weight or the wheel weight is measured by measuring the elastic deformation of the upper plate under the action of the axle weight or the wheel weight; or between the upper and lower plates, and the weight data is obtained by compressing the sensor structure by applying the axle weight or wheel weight to the upper plate. The weighing device sensor plays a role in bearing and measuring, the bearing requires the structure to have strain as small as possible so as to prevent the structure from being crushed, and the measuring requires the structure to have strain as large as possible so as to improve the output amplitude. In practical application, in order to improve reliability and prevent the sensor from being damaged, the design sensitivity of a general sensor is slightly low, and the resolution and the precision of the sensor are difficult to improve.

In order to prevent that the direct bearing of sensor and easy damage, utility model patent application No. 201920510528.1 discloses a weighing sensor and dynamic truck scale, and this weighing sensor includes supporter and under bracing body, goes up and is provided with the elastic deformation body between supporter and the under bracing body, and the foil gage is pasted to the elastic deformation body outer wall, and the elastic deformation body is warp after the pressurized, and the foil gage detects to be transformed into signal of telecommunication after warping and carries to processing system. Because the elastic deformation body is utilized to bear the load, the strain gauge is not used to bear the load, and the strain gauge can be prevented from being damaged by pressure. However, since the driving force or braking force in the driving direction exists during the driving of the vehicle and the lateral force exists in the lateral direction perpendicular to the driving direction, these forces also cause elastic deformation, and thus the detection result is inaccurate.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a dynamic weighing sensor and dynamic weighing device are provided, can eliminate drive power or brake power, horizontal power to measuring result's influence, improve the accuracy that detects, avoid the direct bearing of sensor and impaired easily simultaneously.

The utility model provides a technical scheme that its technical problem adopted is: the dynamic weighing sensor comprises a sensitive beam and a sensitive element, wherein the sensitive beam is vertically arranged,

sensitive roof beam has a leading flank, a trailing flank, a left surface and a right flank, the leading flank is parallel with the trailing flank, and the left surface is parallel with the right flank, and the leading flank is perpendicular with the left surface, leading flank, trailing flank, left surface and right flank all are provided with sensing element, and sensing element's position satisfies: when the sensitive beam generates bending deformation, the deformation amounts of the sensitive elements on the front side surface and the rear side surface are consistent, and the deformation amounts of the sensitive elements on the left side surface and the right side surface are consistent.

Furthermore, an upper mounting head is arranged at the top of the sensitive beam, a lower mounting head is arranged at the bottom of the sensitive beam, and the upper mounting head, the sensitive beam and the lower mounting head are integrally formed.

Further, the sensitive element is a semiconductor strain gauge produced by an MEMS process, and a Wheatstone bridge is arranged in the semiconductor strain gauge.

Furthermore, the cross section of the sensitive beam is square.

Furthermore, the front side surface, the rear side surface, the left side surface and the right side surface are all provided with a sensing element, the sensing elements on the front side surface, the rear side surface, the left side surface and the right side surface are all located in the middle of the sensing beam, and the 4 sensing elements are located at the same height.

The dynamic weighing device comprises an upper support piece, a lower support piece and a plurality of dynamic weighing sensors;

the dynamic weighing sensor comprises a sensitive beam and a sensitive element, wherein the sensitive beam is vertically arranged, the upper end of the sensitive beam is arranged on the upper supporting piece, and the lower end of the sensitive beam is arranged on the lower supporting piece;

Furthermore, the lower surface of the upper supporting piece is provided with an upper mounting groove, the upper surface of the lower supporting piece is provided with a lower mounting groove, the upper end of each sensitive beam is mounted in the upper mounting groove, and the lower end of each sensitive beam is mounted in the lower mounting groove.

Furthermore, an upper mounting head is arranged at the upper end of the sensitive beam, a lower mounting head is arranged at the lower end of the sensitive beam, the upper mounting head is in clearance fit with the upper mounting groove, and the lower mounting head is in clearance fit with the lower mounting groove;

the bottom of going up the mounting groove is provided with vertical countersunk head through-hole, be provided with the screw in the countersunk head through-hole, the screw runs through sensitive roof beam back and lower supporter threaded connection, has the clearance between screw and the countersunk head through-hole pore wall and between screw and the sensitive roof beam, and the installation moment of torsion of all screws is the same.

Furthermore, the fit clearance between the upper mounting head and the upper mounting groove is 0.05mm, and the fit clearance between the lower mounting head and the lower mounting groove is 0.05 mm.

Furthermore, the upper surface of the lower support piece is provided with a vertical guide post, and the guide post is in sliding fit with the upper support piece.

The utility model has the advantages that:

1. the sensitive beam bears the weight, and the sensitive element does not bear the weight, so that the sensitive element is prevented from being damaged due to compression.

2. When the sensitive beam bears the load, the sensitive elements on the 4 side surfaces simultaneously generate output, the output can be amplified through adding, and when the dynamic equipment is light in weight and the sensitive beam is small in compression deformation, enough output amplitude can be generated, so that the measurement range is expanded, and the sensitive beam can be effectively measured in a motorcycle or a large truck.

3. When the dynamic equipment has transverse force, driving force or braking force, the sensitive beam can generate bending deformation while compressing and deforming, one side surface is pressed when bending, the other corresponding side surface is pulled, and the deformation of the two side surfaces is inconsistent, so that the measurement error is large when only one sensitive element is arranged. Because external force is linear correlation with bending strain, bending strain is linear relation with sensing element, the utility model discloses a front surface, trailing flank, left surface and the right flank at sensitive roof beam all set up a sensing element, the deflection of the sensing element on two inconsistent sides of deflection adds, can offset the bending deformation of two sides, obtains accurate compression deformation to eliminate drive power or brake power, transverse force and to the influence of measuring result, guarantee to measure the accuracy.

4. The weighing device has the advantages of simple structure, low production and manufacturing difficulty, and reduced production cost, and is suitable for dynamic weighing of various devices and static weighing.

Drawings

Fig. 1 is a schematic perspective view of the dynamic weighing sensor of the present invention;

FIG. 2 is a schematic top cross-sectional view of the dynamic weighing cell of the present invention;

FIG. 3 is a schematic front view of one embodiment of a dynamic load cell of the present invention;

FIG. 4 is a schematic front view of another embodiment of a dynamic load cell of the present invention;

FIG. 5 is a schematic front view of another embodiment of a dynamic load cell of the present invention;

FIG. 6 is a schematic view of a sensing beam bearing weight only;

FIG. 7 is a schematic view of a sensitive beam bearing weight while also being subjected to a driving or braking force;

FIG. 8 is a schematic view of a sensitive beam bearing weight while also being subjected to lateral forces;

FIG. 9 is a schematic perspective view of the dynamic weighing apparatus;

FIG. 10 is a front cross-sectional schematic view of the dynamic weighing apparatus;

reference numerals: 1-upper support member; 2-a lower support; 3-sensitive beam; 31 — front side; 32-rear side; 33-left flank; 34-right side; 4-a sensitive element; 5-an upper mounting head; 6-lower mounting head; 7-screws; 8, a guide post; f-force in horizontal direction, G-weight.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

The utility model discloses a dynamic weighing sensor, as shown in fig. 1 and fig. 2, including sensitive roof beam 3 and sensing element 4, the vertical setting of sensitive roof beam 3. The sensitive beam 3 is made of high-strength materials, such as any high-strength alloy steel, and can generate elastic deformation after being stressed. Specifically, when the sensitive beam 3 is heavily stressed, the sensitive beam 3 is compressively deformed, as shown in fig. 6. The sensitive element 4 can sense the deformation of the sensitive beam 3 and generate an output signal, and the amplitude of the output signal is linearly related to the deformation of the sensitive beam 3, so that the weight of the tested dynamic equipment can be calculated according to the output of the sensitive element 4.

The sensitive beam 3 is provided with a front side 31, a back side 32, a left side 33 and a right side 34, the front side 31 is parallel to the back side 32, the left side 33 is parallel to the right side 34, the front side 31 is perpendicular to the left side 33, and the sensitive elements 4 are arranged on the front side 31, the back side 32, the left side 33 and the right side 34. The front, rear, left, right and other directions are referred to the moving direction of the dynamic device to be tested, the advancing direction of the dynamic device to be tested is taken as the front, the front side surface 31 and the rear side surface 32 are perpendicular to the advancing direction of the dynamic device to be tested, and the left side surface 33 and the right side surface 34 are parallel to the advancing direction of the dynamic device to be tested. As shown in fig. 2, the direction of the arrow in fig. 2 is the forward direction of the dynamic device under test.

The sensitive element 4 generates output through self deformation, the output amplitude is related to the deformation, when the tested dynamic device has force in the horizontal direction and transmits the force to the sensitive beam 3, the sensitive beam 3 can generate bending deformation, the deformation of each side surface of the sensitive beam 3 is inconsistent, and in order to eliminate the error caused by the bending deformation, the position of the sensitive element 4 needs to meet the following requirements: when the sensor beam 3 is subjected to bending deformation, the deformation amounts of the sensors 4 on the front side surface 31 and the rear side surface 32 are consistent, and the deformation amounts of the sensors 4 on the left side surface 33 and the right side surface 34 are consistent. In order to achieve this, the sensor 4 may be arranged in the following ways: 1, as shown in fig. 3, one sensing element 4 is disposed on each of the front side 31, the rear side 32, the left side 33, and the right side 34, and the sensing elements 4 on each of the front side 31, the rear side 32, the left side 33, and the right side 34 are all located in the middle of the sensing beam 3, and the 4 sensing elements 4 are located in the strain equalization regions of the 4 sides, and the 4 sensing elements 4 are located at the same height. 2, as shown in fig. 4, a sensing element 4 is disposed on each of the front side 31, the rear side 32, the left side 33 and the right side 34, the sensing element 4 is located in the strain equalization region of the 4 sides, the sensing elements 4 on the front side and the rear side are in central symmetry with respect to the center of the sensing beam 3, and the sensing elements 4 on the left side and the right side are in central symmetry with respect to the center of the sensing beam 3. 3. As shown in fig. 5, 2, 3, 4 or more sensors 4 are disposed on each of the front side 31, the rear side 32, the left side 33 and the right side 34, and the sensors 4 on the 4 sides are disposed in the same manner.

When the sensing beam 3 only bears the weight, only the compression deformation is generated, and as shown in fig. 6, the deformation amount of the sensing elements 4 on 4 sides is the same, and the output is also the same. When the dynamic device has horizontal forces such as transverse force, driving force or braking force, the sensitive beam 3 not only generates compression deformation, but also generates bending deformation when the horizontal forces are transmitted to the top end of the sensitive beam 3, so that the deformation amount of different sides is inconsistent. Assuming that a braking force exists in the dynamic device, as shown in fig. 7, the sensitive beam 3 bends forward, the compression amount of the front side surface 31 is larger than that of the sensitive beam 3, and the compression amount of the rear side surface 32 is smaller than that of the sensitive beam 3. Assuming that the dynamic device has a lateral force towards the right, as shown in fig. 8, the sensitive beam 3 bends to the right, the right side face 34 is compressed by a larger amount than the sensitive beam 3, and the left side face 33 is compressed by a smaller amount than the sensitive beam 3. In this case, if only one sensor 4 is provided on the sensor beam 3, it is difficult to accurately measure the amount of compressive deformation of the sensor beam 3, and the measurement error is large. And the utility model discloses set up sensing element 4 respectively in 4 sides of sensitive roof beam 3, can detect the deflection of leading flank 31 simultaneously, trailing flank 32, left surface 33 and right flank 34, and the deflection of each side is linear correlation with the effort that receives, the testing result of sensing element 4 is linear correlation with the deflection of each side, if when the condition as shown in fig. 7 appears, the deflection of leading flank 31 equals the bending deformation that the compressive deformation of sensitive roof beam 3 leads to in addition to the braking force, the deflection of trailing flank 32 equals the bending deformation that the compressive deformation of sensitive roof beam 3 leads to subtracts the braking force, consequently, the deflection of leading flank 31 and the deflection of trailing flank 32 are 2 times of the compressive deformation of sensitive roof beam 3 promptly, thereby the bending deformation that leads to the braking force offsets. Similarly, the sum of the deformation amounts of the left side surface 33 and the right side surface 34 is 2 times of the compression deformation of the sensitive beam 3, and the bending deformation caused by the transverse force is offset. Therefore, the utility model discloses can eliminate the influence that the ascending power in horizontal direction such as transverse force, drive power or brake power brought, guarantee the accuracy that detects.

The sensing element 4 can be an existing element such as a piezoelectric sheet and is adhered to the sensing beam 3. As a preferred embodiment: the sensitive element 4 is a semiconductor strain gauge produced by an MEMS process, and a Wheatstone bridge is arranged in the semiconductor strain gauge, so that the MEMS sensor has the advantages of high integration level, reliability, high sensitivity, stable performance and the like.

The sensitive beam 3 can be an I-beam prepared by adopting the processing technology of the train guide rail. Preferably, the cross section of the sensitive beam 3 is square. Further, the sensitive beam 3 may be an octagonal beam or the like.

When the dynamic weighing sensor is used, the dynamic weighing sensor needs to be installed on a path through which dynamic equipment passes, for convenience of installation, an upper installation head 5 is arranged at the top of the sensitive beam 3, a lower installation head 6 is arranged at the bottom of the sensitive beam, and the upper installation head 5, the sensitive beam 3 and the lower installation head 6 are integrally formed. The upper mounting head 5 and the lower mounting head 6 are rectangular parallelepiped or cylindrical.

As shown in fig. 9 and 10, the dynamic weighing apparatus using the above dynamic weighing cell includes an upper support member 1, a lower support member 2, and a plurality of dynamic weighing cells; the dynamic weighing sensor comprises a sensitive beam 3 and a sensitive element 4, wherein the sensitive beam 3 is vertically arranged, the upper end of the sensitive beam 3 is arranged on an upper support member 1, and the lower end of the sensitive beam 3 is arranged on a lower support member 2. The upper support part 1 is used for supporting the dynamic device to be tested and is in direct contact with the dynamic device to be tested, when the dynamic device to be tested moves to the upper support part 1, the upper support part 1 transmits the weight of the dynamic device to be tested to the sensitive beam 3, and the sensitive beam 3 generates compression deformation. The sensing element 4 can sense the deformation of the sensing beam 3 and generate an output signal, and the amplitude of the output signal is linearly related to the deformation of the sensing beam 3. The lower support 2 is used for supporting the whole equipment and bearing, and the upper support 1 and the lower support 2 can adopt high-strength plates.

The sensitive beam 3 has a front side 31, a back side 32, a left side 33 and a right side 34, the front side 31 is parallel to the back side 32, the left side 33 is parallel to the right side 34, and the front side 31 is perpendicular to the left side 33, the front side 31, the back side 32, the left side 33 and the right side 34 are all provided with the sensitive element 4, and the position of the sensitive element 4 needs to satisfy: when the sensor beam 3 is subjected to bending deformation, the deformation amounts of the sensors 4 on the front side surface 31 and the rear side surface 32 are consistent, and the deformation amounts of the sensors 4 on the left side surface 33 and the right side surface 34 are consistent.

The number of the sensitive beams 3 is multiple, the sensitive beams can be distributed in an array form, specifically, the sensitive beams can be rectangular array, prismatic array or circumferential array, the number and the spacing of the sensitive beams 3 can be determined according to the size of the dynamic device to be tested, and sensors with different numbers of the sensitive beams 3 are manufactured aiming at different dynamic devices. During measurement, the output of the sensitive elements 4 on each sensitive beam 3 is added to calculate the weight of the dynamic device to be measured.

In order to facilitate installation of each dynamic weighing sensor, the lower surface of the upper support member 1 is provided with an upper mounting groove, the upper surface of the lower support member 2 is provided with a lower mounting groove, the upper end of each sensitive beam 3 is installed in the upper mounting groove, and the lower end of each sensitive beam is installed in the lower mounting groove.

The upper end of the sensitive beam 3 can be directly inserted into the upper mounting groove, and the lower end is inserted into the lower mounting groove, as a preferred embodiment: the upper end of the sensitive beam 3 is provided with an upper mounting head 5, the lower end of the sensitive beam is provided with a lower mounting head 6, the upper mounting head 5, the sensitive beam 3 and the lower mounting head 6 are integrally formed, the upper mounting head 5 is in clearance fit with an upper mounting groove, the lower mounting head 6 is in clearance fit with a lower mounting groove, and the fit clearance is preferably 0.05mm, so that acting forces between the side surface of the upper mounting head 5 and the upper support member 1 and between the side surface of the lower mounting head 6 and the lower support member 2 after assembly are avoided, and the weight of the dynamic device can be completely transmitted to the sensitive beam 3 when the dynamic device.

And simultaneously, the tank bottom of going up the mounting groove is provided with vertical countersunk head through-hole, be provided with screw 7 in the countersunk head through-hole, screw 7 runs through sensitive roof beam 3 back and 2 threaded connection of support piece down, has the clearance between screw 7 and the countersunk head through-hole pore wall and between screw 7 and sensitive roof beam 3. The screw 7 connects the upper support member 1, the sensitive beam 3 and the lower support member 2 into a whole, so that the stability and the integrity of the whole sensor are improved. And gaps are reserved between the screw 7 and the wall of the countersunk head through hole and between the screw 7 and the sensitive beam 3. When the tested dynamic equipment transmits force in the horizontal direction to the upper supporting piece 1, the upper supporting piece 1 transmits the horizontal force to the upper mounting head 5, fine horizontal movement of the upper supporting piece 1 may exist due to the clearance fit between the upper mounting head 5 and the upper mounting groove, and the clearance between the screw 7 and the wall of the countersunk through hole is to avoid the influence of the contact of the screw 7 and the wall of the countersunk through hole on the transmission of the horizontal force, ensure that the horizontal force can be transmitted to the upper mounting head 5 completely, and enable the sensor to accurately detect the horizontal acting force of the tested moving component. The gap between the screw 7 and the sensitive beam 3 is used for ensuring that the inner wall of the sensitive beam 3 does not contact with the screw 7 when the sensitive beam 3 generates bending deformation, so that the deformation of the sensitive beam 3 blocked by the screw 7 is avoided, and the detection accuracy is ensured. When the sensitive beams 3 are distributed in an array manner, the mounting torques of all the screws 7 are the same, so that the tension force applied to each sensitive beam 3 is equal, and the detection accuracy is ensured.

For the convenience of assembly, the upper surface of the lower support 2 is provided with vertical guide posts 8, and the guide posts 8 are in sliding fit with the upper support 1. The upper supporting piece 1 is provided with a guide hole matched with the guide column 8, during assembly, the lower mounting head 6 of each sensitive beam 3 is firstly mounted in the lower mounting groove of the lower supporting piece 2, the guide column 8 is aligned to the guide hole, the upper supporting piece 1 and the lower supporting piece 2 move in opposite directions, and the upper mounting head 5 of each sensitive beam 3 can accurately enter the upper mounting groove of the upper supporting piece 1 through positioning of the guide column 8.

The measuring method of the dynamic weighing device comprises the following steps:

the dynamic weighing device is fixedly arranged on the moving track of the dynamic device to be measured, so that the left side surface 33 and the right side surface 34 of the sensitive beam 3 are ensured to be parallel to the moving track of the dynamic device to be measured, and the front side surface 31 and the back side surface 32 are ensured to be perpendicular to the moving track of the dynamic device to be measured.

When the dynamic equipment passes through the upper supporting piece 1, the weight is transmitted to the sensitive beam 3 through the upper supporting piece 1, the sensitive beam 3 generates compression deformation and drives the sensitive elements 4 on the front side surface 31, the rear side surface 32, the left side surface 33 and the right side surface 34 to generate deformation, the sensitive elements 4 on the 4 side surfaces respectively generate output according to respective deformation, and the output of the sensitive elements 4 on the 4 side surfaces are added to obtain a weight signal borne by the sensitive beam 3.

The output of the sensor 4 is positively correlated with the amount of lateral deformation, so that the addition of the outputs of the sensors 4 on 4 sides can cancel the influence of horizontal forces such as lateral force, driving force, braking force, etc., and amplify the detection result by multiple times, specifically, if one sensor 4 is provided on each side, the detection result is amplified by 4 times, if 2 sensors 4 are provided on each side, the detection result is amplified by 8 times, and so on. When the weight of the dynamic equipment is small and the compression deformation of the sensitive beam 3 is small, enough output amplitude can be generated, so that the measurement range is expanded, and effective measurement can be performed on vehicles as small as motorcycles and large as trucks.

If the deformation of the front side 31 is equal to the compression deformation of the sensitive beam 3 plus the bending deformation caused by the braking force and the deformation of the rear side 32 is equal to the compression deformation of the sensitive beam 3 minus the bending deformation caused by the braking force when the situation as shown in fig. 7 occurs, then the deformation of the front side 31 minus the deformation of the rear side 32 is 2 times of the bending deformation caused by the braking force, and then the driving force or the braking force of the dynamic device can be calculated according to the output difference of the sensitive elements 4 on the front side 31 and the rear side 32. Similarly, the magnitude of the lateral force of the dynamic device can be calculated from the difference in the outputs of the sensing elements 4 on the left side 33 and the right side 34 of the sensing beam 3.

The dynamic device can be various horizontal motion devices, and as a preferred embodiment: the dynamic device is a vehicle. The sensor with the sensitive beams 3 distributed in an array can also detect the following parameters of the vehicle:

and obtaining the lane where the vehicle is located according to the position of the sensitive beam 3 generating the output. Specifically, when the automobile reaches the sensor, the wheels are in contact with the upper supporting piece 1, the sensitive beam 3 below the contact position deforms and outputs signals, the positions of the wheels can be determined according to the positions of the sensitive beams 3 which generate the output, and the lane where the automobile is located can be calculated according to the positions of the wheels.

And calculating the speed of the vehicle according to the distance between the front sensitive beam 3 and the rear sensitive beam 3 and the time difference of the output generated by the front sensitive beam 3 and the rear sensitive beam 3. When the automobile runs, wheels pass through at least one row of sensitive beams 3 arranged in the front-rear direction in sequence, two of the sensitive beams 3 in the row are selected as reference, the distance between the two sensitive beams 3 is used as a distance, an output time difference is used as time, and the distance divided by the time is the speed of the automobile.

Further, the vehicle tire additional pressure and the like can be calculated from the outputs of the respective sensitive beams 3.

The utility model discloses can be applied to the static scene of weighing of goods, also can be applied to the scene of weighing of dynamic such as the car does not stop to overload transfinites and highway crossing ETC is weighed fast. In addition, the three-dimensional force transducer can also be used as a three-dimensional force transducer of large equipment.

The utility model has the advantages of it is following:

1. the sensitive beam 3 has strong bearing capacity, and the sensitive element 4 does not bear the weight, so that the sensitive element 4 is prevented from being damaged due to compression.

2. When the sensitive beam 3 bears the load, the sensitive elements 4 on the 4 side surfaces simultaneously generate output, the output is added to play a role of amplifying the output, and when the dynamic equipment is light in weight and the sensitive beam 3 is small in compression deformation, enough output amplitude can be generated, so that the measurement range is expanded, and effective measurement can be performed on the sensitive beam in a size of a motorcycle or a large truck.

3. The output addition of the 4 sensitive elements 4 of each sensitive beam 3 can automatically decouple the influence of braking force, transverse force and the like on output signals, and the accuracy of measurement is ensured.

4. Simple structure, the manufacturing degree of difficulty is lower, reduction in production cost.

5. In addition to the weight, information such as the vehicle speed, the vehicle position, and the like can be measured.

Claims

1. Dynamic weighing sensor, including sensitive roof beam (3) and sensing element (4), sensitive roof beam (3) vertical setting, its characterized in that:

sensitive roof beam (3) have a leading flank (31), a trailing flank (32), a left surface (33) and a right flank (34), leading flank (31) are parallel with trailing flank (32), and left surface (33) are parallel with right flank (34), and leading flank (31) and left surface (33) are perpendicular, leading flank (31), trailing flank (32), left surface (33) and right surface (34) all are provided with sensing element (4), and the position of sensing element (4) satisfies: when the sensitive beam (3) generates bending deformation, the deformation amount of the sensitive elements (4) on the front side surface (31) and the rear side surface (32) is consistent, and the deformation amount of the sensitive elements (4) on the left side surface (33) and the right side surface (34) is consistent.

2. The dynamic load cell of claim 1, wherein: the top of the sensitive beam (3) is provided with an upper mounting head (5), the bottom of the sensitive beam is provided with a lower mounting head (6), and the upper mounting head (5), the sensitive beam (3) and the lower mounting head (6) are integrally formed.

3. The dynamic load cell of claim 1, wherein: the sensitive element (4) is a semiconductor strain gauge produced by an MEMS process, and a Wheatstone bridge is arranged in the semiconductor strain gauge.

4. The dynamic load cell of claim 1, wherein: the cross section of the sensitive beam (3) is square.

5. The dynamic load cell of claim 1, wherein: the front side face (31), the rear side face (32), the left side face (33) and the right side face (34) are all provided with one sensitive element (4), the sensitive elements (4) on the front side face (31), the rear side face (32), the left side face (33) and the right side face (34) are all located in the middle of the sensitive beam (3), and the 4 sensitive elements (4) are located at the same height.

6. The dynamic weighing device comprises an upper support piece (1), a lower support piece (2) and a plurality of dynamic weighing sensors; the method is characterized in that:

the dynamic weighing sensor comprises a sensitive beam (3) and a sensitive element (4), wherein the sensitive beam (3) is vertically arranged, the upper end of the sensitive beam (3) is arranged on an upper support piece (1), and the lower end of the sensitive beam is arranged on a lower support piece (2);

7. The dynamic weighing apparatus of claim 6, wherein: the lower surface of the upper supporting piece (1) is provided with an upper mounting groove, the upper surface of the lower supporting piece (2) is provided with a lower mounting groove, the upper end of each sensitive beam (3) is mounted in the upper mounting groove, and the lower end of each sensitive beam is mounted in the lower mounting groove.

8. The dynamic weighing apparatus of claim 7, wherein: an upper mounting head (5) is arranged at the upper end of the sensitive beam (3), a lower mounting head (6) is arranged at the lower end of the sensitive beam, the upper mounting head (5) is in clearance fit with the upper mounting groove, and the lower mounting head (6) is in clearance fit with the lower mounting groove;

go up the tank bottom of mounting groove and be provided with vertical countersunk head through-hole, be provided with screw (7) in the countersunk head through-hole, screw (7) run through sensitive roof beam (3) back and support piece (2) threaded connection down, have the clearance between screw (7) and the countersunk head through-hole pore wall and between screw (7) and sensitive roof beam (3), the installation moment of torsion of all screw (7) is the same.

9. The dynamic weighing apparatus of claim 8, wherein: the fit clearance between the upper mounting head (5) and the upper mounting groove is 0.05mm, and the fit clearance between the lower mounting head (6) and the lower mounting groove is 0.05 mm.

10. The dynamic weighing apparatus of claim 6, wherein: the upper surface of the lower supporting piece (2) is provided with a vertical guide post (8), and the guide post (8) is in sliding fit with the upper supporting piece (1).