CN217687458U

CN217687458U - Strain sensor and vehicle with same

Info

Publication number: CN217687458U
Application number: CN202221977517.2U
Authority: CN
Inventors: 杨德志
Original assignee: Shenzhen Haixing Zhijia Technology Co Ltd
Current assignee: Shenzhen Haixing Zhijia Technology Co Ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2022-10-28
Anticipated expiration: 2032-07-27

Abstract

The utility model provides a strain sensor and have its vehicle, wherein, strain sensor includes: a fixing plate; the first strain gauge and the second strain gauge are respectively arranged on two opposite surfaces of the fixing plate, and are oppositely arranged and positioned in the middle of the fixing plate; the one end and first foil gage and second foil gage of connecting wire are all connected, and the second section of connecting wire is provided with attach fitting. The fixing plate of the strain sensor is arranged on the object to be measured, and when the object to be measured deforms, the fixing plate deforms synchronously. The first strain gauge and the second strain gauge are used for measuring the deformation of the fixing plate, and the first strain gauge and the second strain gauge can form a Wheatstone bridge with two preset resistors, so that the influence of temperature on a measurement result is eliminated, and the accuracy of a subsequent measurement result is ensured.

Description

Strain sensor and vehicle with same

Technical Field

The utility model relates to a vehicle weighing equipment art field, concretely relates to strain sensor and have its vehicle.

Background

Some of the prior art work vehicles have an automatic weighing function. The working principle of automatic weighing is roughly as follows: and a strain gauge is attached to the axle and is connected with a vehicle control system through a connecting line. When the loads on the vehicle are different, the bending degrees of the axles are different, so that the deformation degrees of the strain gauges are different, and the resistance values of the strain gauges are changed. And the vehicle control system calculates the weight of the vehicle in real time according to the resistance value change of the strain gauge through an automatic weighing algorithm preset in the vehicle control system.

However, during the operation of the vehicle, the temperature change at the axle is large, which causes the axle to deform, so that the deformation of the axle cannot accurately reflect the weight change of the vehicle. And the influence of axle temperature change is not considered to the foil gage of weighing among the prior art, leads to the vehicle result of weighing inaccurate.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the influence that the foil gage of weighing among the prior art did not consider axle temperature variation, leads to the inaccurate defect of vehicle weighing result to a strain sensor and have its vehicle is provided.

In order to solve the above problem, the utility model provides a strain sensor, include: a fixing plate; the first strain gauge and the second strain gauge are respectively arranged on two opposite surfaces of the fixing plate, and are oppositely arranged and positioned in the middle of the fixing plate; the one end and first foil gage and second foil gage of connecting wire are all connected, and the second section of connecting wire is provided with attach fitting.

Optionally, a flexible sealant covers the fixing plate, and the flexible sealant covers the first strain gauge and the second strain gauge.

Optionally, the fixing plate includes a deformation section and two mounting sections located at two ends of the deformation section, the mounting sections are adapted to be fixed on an object to be measured, the first strain gauge and the second strain gauge are disposed on the deformation section, and the flexible sealing adhesive is disposed on the deformation section.

Optionally, the side of the deformation section has a recess.

Optionally, the side portions of the upper and lower surfaces of the deformation section have inclined surfaces such that the thickness of the deformation section is gradually reduced in a direction from both sides to the middle portion.

Optionally, a connecting hole is arranged on the mounting section.

Optionally, the strain sensor further includes two mounting seats, and the two mounting seats are disposed corresponding to the two mounting sections.

The utility model also provides a vehicle, including automobile body and the strain sensor of setting on the automobile body, strain sensor is foretell strain sensor.

Optionally, the vehicle body comprises an axle, two strain sensors are arranged on the axle, and the two strain sensors are symmetrically arranged relative to the middle of the axle.

Optionally, the vehicle body further comprises two leaf springs arranged in parallel, the strain sensor being located inside the two leaf springs.

The utility model has the advantages of it is following:

utilize the technical scheme of the utility model, strain sensor's fixed plate sets up on the measuring deformation object, and when the measuring deformation object takes place to warp, the fixed plate takes place to warp in step. The first strain gauge and the second strain gauge are used for measuring the deformation of the fixing plate, and the first strain gauge and the second strain gauge can form a Wheatstone bridge with two preset resistors, so that the influence of temperature on a measurement result is eliminated, and the accuracy of a subsequent measurement result is ensured. Consequently the technical scheme of the utility model the influence that the foil gage of weighing among the prior art did not consider axle temperature variation leads to the inaccurate defect of vehicle weighing result.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 shows a schematic structural diagram of a first embodiment of the strain sensor according to the present invention;

FIG. 2 shows a side view of the strain sensor of FIG. 1;

fig. 3 shows a schematic bottom structure of the vehicle of the present invention;

FIG. 4 shows a schematic view of the vehicle of FIG. 3 at a steer axle;

FIG. 5 shows a schematic view of the vehicle of FIG. 3 at the transaxle;

fig. 6 shows a schematic structural diagram of a mounting seat of a second embodiment of the strain sensor of the present invention;

fig. 7 shows a schematic structural diagram of a mounting seat and a positioning plate of a second embodiment of the strain sensor of the present invention; and

fig. 8 shows an assembly diagram of the mount fixing plate according to the second embodiment of the strain sensor of the present invention.

Description of reference numerals:

10. a fixing plate; 11. a deformation section; 111. a recessed portion; 112. an inclined surface; 12. an installation section; 121. connecting holes; 20. a first strain gauge; 30. a second strain gauge; 40. connecting wires; 41. connecting a joint; 50. flexible glue sealing; 60. a mounting base; 70. positioning a plate; 100. a strain sensor; 200. an axle; 300. a leaf spring.

Detailed Description

The technical solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Example one

As shown in fig. 1 and 2, the strain sensor of the first embodiment includes a fixing plate 10, a first strain gauge 20, a second strain gauge 30, and a connection line 40. The first strain gage 20 and the second strain gage 30 are respectively disposed on two opposite surfaces of the fixing plate 10, and the first strain gage 20 and the second strain gage 30 are disposed opposite to each other and located in the middle of the fixing plate 10. One end of the connection line 40 is connected to both the first strain gauge 20 and the second strain gauge 30, and a second section of the connection line 40 is provided with a connection tab 41.

By using the technical scheme of the embodiment, the fixing plate 10 of the strain sensor is arranged on the deformation object to be measured, and when the deformation object to be measured deforms, the fixing plate 10 deforms synchronously. The first strain gauge 20 and the second strain gauge 30 are used for measuring the deformation of the fixing plate, and the first strain gauge 20 and the second strain gauge 30 can form a Wheatstone bridge with two preset resistors, so that the influence of temperature on a measurement result is eliminated, and the accuracy of a subsequent measurement result is ensured. Therefore, the technical scheme of the embodiment solves the defect that the weighing strain gauge in the prior art does not consider the influence of the temperature change of the axle 200, so that the weighing result of the vehicle is inaccurate.

It should be noted that the strain sensor in the present embodiment is used for weighing a vehicle, and therefore the deformation object to be measured is referred to as an axle 200 at the bottom of the vehicle. Of course, those skilled in the art will understand that other objects requiring deformation measurement can be used as the above-mentioned object to be measured.

In this embodiment, the fixing plate 10 is fixedly attached to the axle 200 at the bottom of the vehicle, so that when the axle 200 is deformed, the fixing plate 10 is simultaneously deformed. The first strain gage 20 and the second strain gage 30 are capable of measuring the amount of deformation of the fixed plate 10, and thus the axle 200.

As can be seen from fig. 1, the first strain gage 20 and the second strain gage 30 are the same size and are respectively disposed on opposite sides of the fixed plate 10. And the first and second strain gauges 20 and 30 are located at the same position on the fixed plate 10. The connection line 40 is connected with both the first strain gauge 20 and the second strain gauge 30, and the connection joint 41 of the connection line 40 can be connected with a control system of the vehicle, so that the resistance change values of the first strain gauge 20 and the second strain gauge 30 are transmitted into the control system of the vehicle. The control system measures the weight of the vehicle according to a weighing algorithm stored therein.

Further, the first and second strain gauges 20 and 30 may be attached to the fixing plate 10 by means of glue.

Preferably, the above-mentioned connection joint 41 is a vehicle-scale aircraft joint.

It should be noted that the first strain gauge 20 and the second strain gauge 30 in this embodiment form a wheatstone bridge with two other preset constant resistors in the vehicle, so that the strain sensor in this embodiment has the following advantages:

1. the temperature compensation function is provided, specifically, the wheatstone bridge has the temperature compensation function, so that the strain sensor in the application also has the temperature compensation function, and the measuring result is more accurate.

2. The Wheatstone bridge can output the strain value 2 times of the 1/4 bridge, thereby playing a role in signal amplification and facilitating subsequent measurement and calculation.

As shown in fig. 1 and fig. 2, in the technical solution of the present embodiment, a flexible sealant 50 covers the fixing plate 10, and the flexible sealant 50 covers the first strain gauge 20 and the second strain gauge 30. The flexible sealant 50 can protect the first strain gauge 20 and the second strain gauge 30, and meanwhile, the flexible sealant 50 is soft and deformable, so that the deformation of the fixing plate 10 is not affected.

Preferably, the flexible sealing compound 50 can be made of a silicone material.

As shown in fig. 1 and 2, in the solution of the present embodiment, the fixing plate 10 includes a deformation section 11 and two mounting sections 12 located at two ends of the deformation section 11. The mounting section 12 is adapted to be fixed to an object to be measured, the first strain gauge 20 and the second strain gauge 30 are arranged on the deformation section 11, and the flexible sealing compound 50 is arranged on the deformation section 11.

Specifically, the length of the deformation segment 11 is long, and the two mounting segments 12 fix both ends of the deformation segment 11 to the axle 200. The deformation section 11 is thus deformed synchronously when the axle 200 is deformed. Further, the mounting section 12 is of a flat and long structure. The first strain gage 20 and the second strain gage 30 are both disposed at a central position of the deformation section 11.

Preferably, the deformation section 11 and the two mounting sections 12 are manufactured and molded by integral processing.

As shown in fig. 1, in the solution of the present embodiment, the side of the deformation section 11 has a recess 111. Specifically, both sides of the deformation section 11 have recesses, so that the whole fixing plate 10 has a structure that is wide at both sides and narrow in the middle.

Further, the above structure allows the width of the mounting segment 12 to be wide, thereby securing the coupling strength thereof with the axle 200. And the width of the middle part of the deformation section 11 is narrower, which is beneficial to the deformation of the deformation section, thereby ensuring the accuracy of the measuring result.

As shown in fig. 2, in the solution of the present embodiment, the side portions of the upper surface and the lower surface of the deformation section 11 have inclined surfaces 112, and the inclined surfaces 112 gradually decrease the thickness of the deformation section 11 in the direction from the two sides to the middle. Specifically, two inclined surfaces 112 are provided on both sides of the upper surface of the deformation section 11, and two inclined surfaces 112 are provided on both sides of the lower surface of the deformation section 11, so that the middle portion of the deformation section 11 is inwardly recessed.

As can be seen in fig. 2, since the middle portion of the deformation section 11 is recessed inward, the mounting planes of the first strain gage 20 and the second strain gage 30 are lower than the surface of the mounting section 12. After the fixing plate 10 is covered by the flexible sealant 50, the flexible sealant can completely wrap the first strain gauge 20 and the second strain gauge 30, so as to enhance the protection effect on the first strain gauge 20 and the second strain gauge 30.

As shown in fig. 1, in the solution of the present embodiment, a connection hole 121 is provided on the mounting section 12. Specifically, three mounting holes are provided at intervals on each mounting section 12. Six corresponding threaded holes are machined in the axle 200, and during assembly, screws are inserted through the mounting holes and screwed into the threaded holes in the axle 200.

As shown in fig. 3, the present embodiment further provides a vehicle, which includes a vehicle body and a strain sensor 100 disposed on the vehicle body, where the strain sensor 100 is the above-mentioned strain sensor.

As shown in fig. 3, in the solution of the present embodiment, the vehicle body includes an axle 200, two strain sensors 100 are disposed on the axle 200, and the two strain sensors 100 are disposed symmetrically with respect to the middle of the axle 200. Specifically, the vehicle in this embodiment is provided with four axles 200, two strain sensors 100 being provided on each axle, and thus a total of eight strain sensors 100 being provided.

As shown in fig. 3, the vehicle body preferably further includes two plate springs 300 arranged in parallel, and the strain sensor 100 is located inside the two plate springs 300.

Further, as shown in fig. 4 and 5, the axle 200 includes a steering axle and a drive axle, and the above-described strain sensors 100 are disposed on both the steering axle and the drive axle.

Further, the strain sensor 100 may be provided between the axle 200 and the inner side of the contact surface of the plate spring 300, or on the upper surface of the axle 200 or the lower surface of the axle 200, or on the front and rear sides of the axle 200 near the upper surface, or on the front and rear sides of the axle 200 near the lower surface. With the strain sensor 100 preferably disposed on the upper surface of the axle 200.

Example two

As shown in fig. 6 to 8, the strain sensor of the second embodiment is different from the first embodiment in that if no screw hole is machined in the axle 200, a mounting seat 60 needs to be provided on the axle 200 to assemble the fixing plate 10. Specifically, the strain sensor further includes two mounting seats 60, and the two mounting seats 60 are disposed corresponding to the two mounting sections 12.

As shown in fig. 7, when two mounting seats 60 are mounted, positioning is performed by using a positioning plate 70. The length and width of the positioning plate 70 are the same as those of the fixing plate 10, and six connecting holes are also formed in the positioning plate 70, and are distributed in the same manner as the six connecting holes 121 in the fixing plate 10. Six threaded holes are provided in each mounting socket 60. The positioning plate 70 is assembled with the two mounting seats 60 by screws, then the two mounting seats 60 are fixed on the axle 200 (for example, by welding), and finally the positioning plate 70 is detached from the mounting seats 60.

As shown in fig. 8, when the fixing plate 10 is assembled, the two mounting sections 12 of the fixing plate 10 are disposed corresponding to the two mounting seats 60, and then screws are inserted through the connecting holes 121 and screwed into the threaded holes on the mounting seats 60.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.

Claims

1. A strain sensor, comprising:

a fixed plate (10);

the first strain gauge (20) and the second strain gauge (30) are respectively arranged on two opposite surfaces of the fixing plate (10), and the first strain gauge (20) and the second strain gauge (30) are oppositely arranged and are positioned in the middle of the fixing plate (10);

the connecting wire (40), the one end of connecting wire (40) with first foil gage (20) with second foil gage (30) all are connected, the second section of connecting wire (40) is provided with attach fitting (41).

2. The strain sensor according to claim 1, wherein the fixing plate (10) is covered with a flexible sealant (50), and the flexible sealant (50) covers the first strain gauge (20) and the second strain gauge (30).

3. Strain sensor according to claim 2, wherein the fixing plate (10) comprises a deformation section (11), and two mounting sections (12) at both ends of the deformation section (11), the mounting sections (12) being adapted to be fixed on an object to be measured, the first strain gauge (20) and the second strain gauge (30) being arranged on the deformation section (11), the flexible glue (50) being arranged on the deformation section (11).

4. Strain sensor according to claim 3, wherein the sides of the deformation section (11) have recesses (111).

5. The strain sensor according to claim 3, wherein the side portions of the upper and lower surfaces of the deformation section (11) have inclined surfaces (112), the inclined surfaces (112) being such that the thickness of the deformation section (11) is gradually reduced in a direction from both sides to the middle.

6. Strain sensor according to claim 3, wherein the mounting section (12) is provided with a connection hole (121).

7. The strain sensor according to claim 3, further comprising two mounting seats (60), the two mounting seats (60) being arranged in correspondence with the two mounting sections (12).

8. A vehicle characterized by comprising a vehicle body and a strain sensor (100) provided on the vehicle body, the strain sensor (100) being the strain sensor of any one of claims 1 to 7.

9. Vehicle according to claim 8, characterized in that the vehicle body comprises an axle (200), that two strain sensors (100) are arranged on the axle (200), and that the two strain sensors (100) are arranged symmetrically with respect to the middle of the axle.

10. The vehicle according to claim 9, characterized in that the vehicle body further comprises two leaf springs (300) arranged in parallel, the strain sensor (100) being located inside the two leaf springs (300).