CN210198528U

CN210198528U - Strain gauge assembly

Info

Publication number: CN210198528U
Application number: CN201921128153.9U
Authority: CN
Inventors: Hairou Huang; 黄海柔; Anbing Li; 李安兵; Jiajun Zhang; 张佳俊; Jianwu Xiong; 熊建武; Mingxian Liang; 梁明献; Hao Zhang; 张�浩; Rongxiao Li; 李榕晓; Caifeng Huang; 黄采枫; Donghui Huang; 黄东辉; Jiamin Zhang; 张佳敏
Original assignee: Zhuhai Li'anda Intelligent Technology Co Ltd
Current assignee: Zhuhai Li'anda Intelligent Technology Co Ltd
Priority date: 2019-07-17
Filing date: 2019-07-17
Publication date: 2020-03-27
Anticipated expiration: 2029-07-17

Abstract

The utility model provides a strain gauge component, which comprises a bottom plate, wherein the upper surface of the bottom plate is bonded with a strain gauge, and the lower surface of the bottom plate is a rough surface; along a first direction, a plurality of adhesive holes are formed in two sides of the bottom plate, and a first adhesive is coated on the lower surface of the bottom plate; the bottom plate is provided with a strip-shaped through hole extending along the second direction, the strip-shaped through hole penetrates through the upper surface and the lower surface of the bottom plate, and the second direction is perpendicular to the first direction. The utility model discloses a strain gauge subassembly installation is very convenient and install easy operation to strain gauge subassembly's detection is more accurate.

Description

Strain gauge assembly

Technical Field

The utility model relates to a weight measurement ware field specifically is to relate to one, relates to a foil gage subassembly.

Background

Urban construction requires a large amount of civil works such as constructing roads, bridges, drilling tunnels, constructing houses, etc., the civil works require the use of a muck truck to transport construction materials such as soil, sand, etc., and a large amount of construction waste is generated during construction, which is required to be transported from a construction site to a designated landfill site for landfill treatment.

Generally, large trucks are used for transporting construction materials and construction wastes, and the phenomenon of overload of the large trucks and other vehicles and pedestrians on roads is seriously dangerous due to the fact that the phenomenon of overload is more in the transportation process of the large trucks at present, so that the load capacity of the trucks needs to be monitored to reduce the phenomenon of overload of the large trucks.

The method for monitoring the loading capacity of a large truck generally comprises the steps of setting a plurality of monitoring points on a road, and weighing the large truck when the truck passes through the monitoring points. However, this method is inefficient, and requires a large number of monitoring points, which requires a large amount of manpower and material resources. Therefore, people install the weight sensor on the large truck, the load weight of the large truck is measured through the weight sensor on the large truck, the numerical value acquired by the weight sensor is uploaded to the preset background server in a wireless transmission mode, the load weight of the large trucks is monitored by the background server, real-time and remote monitoring is achieved, and needed manpower and material resources are few.

The weight sensor commonly used at present is a weight sensor with a strain gauge, and the strain gauge which can deform is arranged in the weight sensor. Generally, the weight sensor is fixed to a front axle, a middle axle, and a rear axle of the large truck, and when the load capacity of the truck changes, the front axle, the middle axle, and the rear axle are deformed to some extent, for example, the front axle, the middle axle, and the rear axle are bent or the rear axle is slightly lengthened, and the strain gauge on the weight sensor is fixed to the rear axle, so that the change in the length of the rear axle can be detected, and the change in the load capacity of the large truck can be calculated from the relationship between the change in the length of the front axle, the middle axle, and the rear axle and the voltage output of the strain gauge in proportion to each other.

Theoretically, the strain gauge should be subjected to a force in only one direction when measuring the weight, so that the accuracy of the measurement can be ensured. For example, when the load capacity of a large truck changes, the lengths of the front axle, the middle axle and the rear axle change, and the strain gauge only needs to be stressed by the change of the length of the rear axle, so that the change of the length of the rear axle can be accurately detected, and the change of the load capacity of the large truck can be accurately detected.

However, in practice, when the load capacity of a large truck changes, the rear axle does not only change in length, but also changes in a direction perpendicular to the length, that is, the width of the rear axle, and if the stress of the strain gauge in the width direction of the rear axle is unbalanced, the stress of the strain gauge in the width direction of the rear axle affects the stress of the strain gauge in the length direction of the rear axle, so that the weight detection is inaccurate.

In addition, since the conventional weight sensor is generally fixed to a large truck by welding or screws, a large number of special tools, such as welding equipment, are generally required for the installation of the weight sensor, the installation of the weight sensor needs to be performed in a vehicle maintenance plant, the installation cost is high, and the installation efficiency is low.

SUMMERY OF THE UTILITY MODEL

A first object of the present invention is to provide a strain gauge assembly capable of improving the accuracy of load detection of large trucks.

In order to achieve the first object, the strain gauge assembly provided by the present invention comprises a bottom plate, wherein the strain gauge is adhered to the upper surface of the bottom plate, and the lower surface of the bottom plate is a rough surface; along a first direction, a plurality of adhesive holes are formed in two sides of the bottom plate, and a first adhesive is coated on the lower surface of the bottom plate; the bottom plate is provided with a strip-shaped through hole extending along the second direction, the strip-shaped through hole penetrates through the upper surface and the lower surface of the bottom plate, and the second direction is perpendicular to the first direction.

It can be seen by above-mentioned scheme that be provided with a plurality of viscose holes on the bottom plate of foil gage subassembly, after the lower surface coating first adhesive of bottom plate, first adhesive is filled a plurality of viscose holes, when the bottom plate bonds on work pieces such as rear axle, fills the first adhesive in the viscose hole and plays the fixed action to the bottom plate, avoids the bottom plate to extend along the first direction to avoid the foil gage to take place deformation in the first direction, reduce the atress of foil gage in the first direction.

Preferably, the first adhesive is a metal welding adhesive, that is, the bottom plate is adhered to the rear axle, so that the bottom plate can be fixed on the rear axle through welding or rivets. Like this, when the width of rear axle changed, the bottom plate also followed the synchronous emergence deformation of rear axle in width direction to it is uneven and cause the influence to the atress in the second direction to eliminate the atress on the first direction, improves the accuracy to the weight detection.

Preferably, the glue hole is an open hole, and an open end of the glue hole is located at an edge of the bottom plate along the first direction.

Therefore, the opening holes are formed in the viscose holes and are arranged at the edges of the bottom plate, so that the first adhesive can be uniformly arranged on the bottom plate, the deformation of the bottom plate along the first direction is uniform, and the influence of the deformation of the strain gauge in the first direction on the deformation of the second direction is reduced.

Further, the elongated holes are located outside two ends of the strain gauge along the second direction. Like this, can offset the deformation that leads to because of the inflation in the first adhesive use through setting up rectangular hole, improve the accuracy that detects.

In a further aspect, the elongated holes include a first elongated hole, the first elongated hole being a kidney-shaped hole, the kidney-shaped hole penetrating the upper and lower surfaces of the bottom plate.

Therefore, the first strip holes are waist-shaped holes, the extending direction of the waist-shaped holes is the second direction, and deformation caused by expansion in the use process of the first adhesive can be counteracted.

In a further aspect, the elongated holes include a second elongated hole, the second elongated hole is an open hole, and an open end of the second elongated hole is located at an edge of the bottom plate along the second direction.

It can be seen that the provision of the second elongated hole further counteracts the stress caused by the expansion of the first adhesive during use.

Still further, on the upper surface of the base plate, the periphery of the strain gauge is coated with a second adhesive.

Therefore, the second adhesive is coated on the periphery of the strain gauge, the strain gauge can be effectively protected through the waterproof and moistureproof effects of the second adhesive, and the situation that the strain gauge is incorrectly detected or damaged due to wetting is avoided.

The other scheme is that one end of the bottom plate is provided with a fixing part, the end part of the communication data wire is fixed in the fixing part, and the communication data wire is electrically connected with the strain gauge.

Therefore, the fixing plate is arranged on the bottom plate to fix the communication data wire, the fixed connection between the communication data wire and the strain gauge can be ensured, and the connection disconnection between the strain gauge and the communication data wire caused by the bumping of a large truck in the use process of the strain gauge is avoided.

In a further aspect, the strain gage assembly further includes a third adhesive, the third adhesive surrounding at least a portion of the base plate and the ends of the communication data wires.

Therefore, the bottom plate and the end part of the communication data line are wrapped by the third adhesive, the whole strain piece assembly and the end part of the communication data line can be integrated, and the situation that the strain piece falls off from the bottom plate due to bumping in the driving and loading processes of a large truck is avoided.

Drawings

Fig. 1 is a schematic structural view of a large truck with an embodiment of the strain gauge assembly of the present invention installed.

Fig. 2 is a schematic structural view of another view angle of a large truck with the strain gauge assembly of the present invention installed.

Fig. 3 is a block diagram of an embodiment of a strain gage assembly and a communication data line according to the present invention.

Fig. 4 is an exploded view of an embodiment of a strain gage assembly and a communication data cable according to the present invention.

Fig. 5 is an enlarged view of the structure of the bottom plate, the strain gauge and the communication chip in the embodiment of the strain gauge assembly of the present invention.

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

Detailed Description

The utility model discloses a strain gauge subassembly can regard as the weight sensor who measures large truck loading capacity, and is preferred, and strain gauge subassembly is installed on large truck's rear axle. Of course, the strain gauge assembly may be installed in the front axle of a large truck or in a girder or other places.

Referring to fig. 1 and 2, the strain gauge assembly of the present invention is installed on a large truck, which may be a dump truck, having a frame 10, preferably, a plurality of tires are provided below the frame 10, and the frame 10 includes a chassis, a girder, a front axle, a rear axle, etc. of the dump truck. A cab 11 is arranged at one section of the frame 10, a driving seat, a copilot seat and a plurality of passenger seats can be arranged in the cab 11, and a plurality of control keys are arranged in the cab 11 and used for controlling the operation of the dump truck.

A bucket 12 is also provided on frame 10, preferably bucket 12 is hinged to frame 10 at the end near the rear of the dump truck, and bucket 12 is connected to hydraulic rod 13 at the end near cab 11. One end of hydraulic stem 13 is fixed on frame 10, and the other end of hydraulic stem 13 and the bottom fixed connection of goods fill 12 will drive goods fill 12 and rotate when hydraulic stem 13 extends, and the one end that this moment goods fill 12 is close to driver's cabin 11 upwards rotates to dump the goods in goods fill 12 to the discharge position, if dump to ground or in the predetermined landfill hole.

In order to detect the load capacity of a large truck, in the present embodiment, the strain gauge assembly 15 is disposed on the rear axle 14, referring to fig. 3, the strain gauge assembly 15 of the present embodiment includes a flat bottom plate 20, a protective glue layer 40 and a structural glue layer 50 are formed on the bottom plate 20, a strain gauge is disposed on the bottom plate 20, one end of the communication data line 16 is connected to the strain gauge assembly and electrically connected to the strain gauge, and a signal collected by the strain gauge can be transmitted to a controller of a vehicle through the communication data line 16.

Referring to fig. 2 and 3, the bottom plate 20 is a plate-shaped plate body, and preferably, the bottom plate 20 is formed by stamping a flat metal sheet, and the strain gauge 31 is fixed on the upper surface of the bottom plate 20. In this embodiment, the upper surface of the floor panel 20 is a surface in the positive z-axis direction, the lower surface of the floor panel 20 is a surface to be bonded to a workpiece, and the workpiece may be a surface of a rear axle of a large truck. Preferably, the lower surface of the base plate 20 is a rough surface, for example, the surface roughness of the lower surface of the base plate 20 is between 10 and 18.

In this embodiment, the strain gauge 31 is bonded to the base plate 20 with an adhesive, for example, an adhesive having a good adhesive property such as an AB glue, and the AB glue can achieve metal adhesion, so that the strain gauge 31 can be firmly bonded to the base plate 20. Besides the strain gauge 31, a communication chip 32 may be bonded to the bottom plate 20, and preferably, the communication chip 32 is close to the strain gauge 31, and a signal output from the strain gauge 31 may be transmitted to the communication data line 16 through the communication chip 32. The communication chip 32 may convert the data collected by the strain gauge 31 into data meeting communication requirements, for example, convert the format of the data collected by the strain gauge 31, or encapsulate the collected data.

In order to protect the strain gauge 31 and the communication chip 32, a protective adhesive layer 40 is formed on the bottom plate 20, and preferably, the protective adhesive layer 40 is formed by silicone, that is, the silicone is dropped on the strain gauge 31 and the communication chip 32 on the upper surface of the bottom plate 20, and the protective adhesive layer 40 is formed after the silicone is solidified. Because the silica gel is soft, the impact force of the outside to the strain gauge 31 and the communication chip 32 can be buffered, and the strain gauge 31 and the communication chip 32 are prevented from being damaged.

Referring to fig. 3, a plurality of adhesive holes 21 are formed in the bottom plate 20, and the plurality of adhesive holes 21 are symmetrically disposed at two ends of the bottom plate 20 along the x-axis direction, in this embodiment, the first direction is the x direction, that is, the width direction of the bottom plate 20. As shown in fig. 3, in the first direction, three adhesive holes 21 are disposed at two edges of the bottom plate 20, each adhesive hole 21 is a semicircular through hole, an opening direction of the adhesive hole 21 faces the outer side of the bottom plate 20, and each adhesive hole 21 penetrates through the upper and lower surfaces of the bottom plate 20.

When the base plate 20 is fixed to the rear axle, after the surface of the rear axle needs to be polished and leveled, a first adhesive is coated on the lower surface of the base plate 20, the first adhesive in this embodiment is a metal welding glue, and preferably, a certain proportion of metal powder is added to the first adhesive to adjust the strength, the shearing force, the expansion coefficient and the cedar ratio of the first adhesive.

Since the plurality of adhesive holes 21 are symmetrically arranged, the first adhesive is filled in the plurality of adhesive holes 21 when the first adhesive is applied to the lower surface of the base plate 20. When the bottom plate 20 is adhered to the rear axle, since the plurality of adhesive holes 21 are filled with the first adhesive, the force applied to the bottom plate 20 by the first adhesive in the plurality of adhesive holes is symmetrical along the first direction, and the unbalanced force formed on the bottom plate 20 along the first direction is avoided.

Since the bonding of the metal solder paste to the base plate 20 is similar to the fixing of the rivet to the base plate 20, that is, when the base plate 20 is bonded to the rear axle by the first adhesive, the base plate 20 is fixed to the rear axle similarly to the rivet. Thus, even if the rear axle deforms in the first direction, as long as the deformation amount of the rear axle at the installation position of the bottom plate 20 is small, the bottom plate 20 deforms less, so that the deformation of the strain gauge 31 in the first direction is small, and the stress of the strain gauge 31 in the second direction is prevented from being influenced by the deformation of the strain gauge 31 in the first direction.

The bottom plate 20 is further provided with a plurality of elongated holes, in this embodiment, the plurality of elongated holes includes two first elongated holes 23 and a plurality of second elongated holes 22, the first elongated holes 23 are two kidney-shaped holes, and the length direction of the first elongated holes 23 is along the y-axis direction, in this embodiment, the y-axis direction is perpendicular to the x-axis direction, and the y-axis direction is the second direction, so that the first direction is perpendicular to the second direction.

The two first elongated holes 23 are located outside the strain gauge 31 and the communication chip 32, that is, the strain gauge 31 and the communication chip 32 are located in a region completely between the two elongated holes 23. The first elongated hole 23 penetrates the upper and lower surfaces of the bottom plate 20. After the first adhesive is applied to the lower surface of the bottom plate 20, the first adhesive can be filled into the two first elongated holes 23, and when the first adhesive is cured and used, because the first adhesive will expand, the two first elongated holes 23 can counteract a part of force generated in the expansion process of the first adhesive, so that the influence of the force generated by the expansion of the first adhesive on the detection of the strain gauge 20 is avoided.

Besides two first elongated holes 23, a plurality of second elongated holes 22 are further disposed on the bottom plate 20, as can be seen from fig. 3, in the second direction, two second elongated holes 22 are disposed at two ends of the bottom plate 20, and the second elongated holes 22 at two ends are symmetrically disposed, the second elongated holes of this embodiment are open-ended through holes, the plurality of second elongated holes 22 are disposed on the edge of the bottom plate 20, and the openings face the outside. The provision of the second plurality of elongated holes 22 may assist the first elongated holes 23 in counteracting the force created by the expansion of the first adhesive.

Since the force generated when the first adhesive expands easily causes the base plate 20 to separate from the rear axle surface, which is also known as debonding, the strain gage assembly may come off the rear axle, resulting in a weak bonding condition of the strain gage assembly. After the elongated holes are formed, stress generated when a part of the first adhesive expands can be offset, the bottom plate 20 is prevented from falling off from the rear axle, and the service life of the strain plate assembly is prolonged.

In this embodiment, what the strain gauge assembly needs to measure is the deformation of the rear axle in the second direction, and the load capacity of the large truck is calculated according to the deformation of the rear axle in the second direction. Therefore, the stress of the strain gauge 31 in the first direction needs to be reduced as much as possible, a plurality of adhesive holes are arranged on the bottom plate 20, and the bottom plate 20 is welded or riveted on the rear axle similarly, so that the force generated by the deformation of most of the rear axle in the first direction is offset, and the influence of the force generated by the deformation of the rear axle in the first direction on the stress of the strain gauge in the second direction can be avoided.

A fixing portion 33 is further provided at one end of the chassis 20, and an end portion of the communication data line 16 is fixed in the fixing portion 33. The fixing portion 33 is provided therein with a mounting groove 34 opened at an upper end thereof, and an end portion of the communication data line 16 is fixed in the mounting groove 34. In the present embodiment, the communication data line 16 is electrically connected to the communication chip 32, and therefore, the communication data line 16 is indirectly electrically connected to the strain gauge 31 through the communication chip 32. Thus, the electrical signal generated by the strain gauge 32 is transmitted to the communication data line 16 via the communication chip 32. In addition, the other end of the communication data line 16 is provided with a plug 17, and the plug 17 can be drawn into a host computer on the vehicle, so that the strain gauge assembly can communicate with the host computer on the vehicle.

In this embodiment, the protective adhesive layer 40 does not wrap the end of the communication data line 16, and in order to protect the entire strain gauge assembly, the structural adhesive layer 50 is formed on the strain gauge assembly, and in this embodiment, the structural adhesive layer 50 is formed by curing the third adhesive. As shown in fig. 1, the structural adhesive layer 50 covers the bottom plate 20 and also covers the end of the communication data line 16 connected to the bottom plate 20, so that the end of the communication data line 16 can be protected and the communication data line 16 is prevented from being damaged due to excessive tensile force.

As can be seen from fig. 1 and 2, the structural adhesive layer 50 fills most of the area of the bottom plate 20, and the structural adhesive layer 50 is provided with a through hole 51, i.e. the structural adhesive layer 50 does not cover the whole bottom plate 20, but covers a part of the area. Preferably, the protective adhesive layer 40 is located in the through hole 51, and a gap is formed between the protective adhesive layer 40 and the inner wall of the through hole 51, and the gap may be filled with the second adhesive, so that the second adhesive is coated on the strain gauge 31 and the communication chip 32 in the circumferential direction. The second adhesive of this embodiment is an adhesive with a moisture-proof function, for example, 704 glue is used to prevent moisture from penetrating into the strain gauge 31 and the communication chip 32, which may damage the strain gauge 31 and the communication chip 32.

Of course, the structural adhesive layer 50 may wrap the entire base plate 20 and the end portions of the strain gauge 31, the communication chip 32 and the communication data line 16.

A preassembled strain gage assembly may be used when mounting the strain gage assembly to the rear axle of a large truck. For example, the strain gauge 31 and the communication chip 32 are bonded to the chassis 20 in advance, the adhesive is applied to the chassis 20 to form the protective adhesive layer 40, the second adhesive is applied to the outer periphery of the protective adhesive layer 40, the communication data line 16 is fixed to the fixing portion 33 of the chassis 20, and then the third adhesive is applied to the chassis 20 to form the structural adhesive layer 50. These works can be carried out at the mill in advance, because the workshop of foil gage subassembly can provide dustless environment, and can produce the foil gage subassembly in batches, like this, the production efficiency of foil gage subassembly is high, and the qualification rate is also higher.

The operation of mounting the strain gauge assembly to the rear axle may be performed at a maintenance factory or a construction site, before the strain gauge assembly is mounted to the rear axle, after cleaning the surface of the rear axle, the surface of the rear axle is polished, the lower surface of the base plate 20 is coated with the first adhesive, the strain gauge assembly coated with the first adhesive is adhered to the surface of the rear axle, and finally, the strain gauge assembly is compacted, i.e., the mounting of the strain gauge assembly is completed.

In this embodiment, the lower surface of the bottom plate 20 is a rough surface, so that the contact area between the first adhesive and the lower surface of the bottom plate 20 is increased, which is beneficial to firmly adhering the strain gauge assembly to the surface of the rear axle.

It can be seen that the installation of the strain gauge assembly of the present embodiment is very simple, and can be performed in a maintenance factory or a construction site, and since the strain gauge 31 is adhered to the bottom plate 20 in advance, it can be avoided that the strain gauge 31 is installed on the bottom plate 20 only at the site of the assembly of the strain gauge assembly, the assembly effect of the strain gauge 31 and the bottom plate 20 can be ensured, and the quality of the strain gauge assembly itself can be ensured.

On the other hand, because set up a plurality of viscose holes on bottom plate 20, can offset the produced power of rear axle deformation in the first direction, avoid the produced power of rear axle deformation in the first direction to cause the influence to the measuring of foil gage in the second direction to improve the accuracy that the foil gage subassembly detected.

Of course, the above-mentioned embodiments are only preferred embodiments of the present invention, and many more variations are possible in practical applications, for example, variations in the type of adhesive used, or variations in the specific positions or number of the glue holes on the bottom plate, or variations in the shape of the bottom plate, etc., which do not affect the implementation of the present invention, and are also included in the scope of the present invention.

Claims

1. A strain gage assembly, comprising:

the upper surface of the bottom plate is bonded with a strain gauge, and the lower surface of the bottom plate is a rough surface;

along a first direction, a plurality of adhesive holes are formed in two sides of the bottom plate, and a first adhesive is coated on the lower surface of the bottom plate;

the bottom plate is provided with a strip hole extending along a second direction, the strip hole penetrates through the upper surface and the lower surface of the bottom plate, and the second direction is perpendicular to the first direction.

2. The strain gage assembly of claim 1, wherein:

the viscose hole is an open hole, and the open end of the viscose hole is located at the edge of the bottom plate along the first direction.

3. The strain gage assembly of claim 1, wherein:

along the second direction, the elongated hole is located outside both ends of foil gage.

4. The strain gage assembly of claim 3, wherein:

the strip holes comprise first strip holes, the first strip holes are waist-shaped holes, and the waist-shaped holes penetrate through the upper surface and the lower surface of the bottom plate.

5. The strain gage assembly of claim 3, wherein:

the elongated holes comprise second elongated holes, the second elongated holes are open holes, and the open ends of the second elongated holes are located at the edges of the bottom plate along the second direction.

6. The strain gage assembly of any one of claims 1-5, wherein:

and a second adhesive is coated on the upper surface of the bottom plate in the circumferential direction of the strain gauge.

7. The strain gage assembly of any one of claims 1-5, wherein:

one end of the bottom plate is provided with a fixing part, the end part of the communication data wire is fixed in the fixing part, and the communication data wire is electrically connected with the strain gauge.

8. The strain gage assembly of claim 7, wherein:

the strain gage assembly further includes a third adhesive surrounding at least a portion of the base plate and an end of the communication data line.