CN217304220U - Railway track pressure sensor - Google Patents
Railway track pressure sensor Download PDFInfo
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- CN217304220U CN217304220U CN202221082004.5U CN202221082004U CN217304220U CN 217304220 U CN217304220 U CN 217304220U CN 202221082004 U CN202221082004 U CN 202221082004U CN 217304220 U CN217304220 U CN 217304220U
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- base member
- tip
- pressure sensor
- railway track
- blind hole
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Abstract
The utility model discloses a railway track pressure sensor, including base member and load seat, the base member is the cuboid structure, the bolted connection hole that link up about two tip of base member all are provided with, the middle part of base member and the position that is located two long limits all are provided with the breach structure, make the width at base member middle part be less than the width of its two tip, preceding at base member middle part, just be located breach structure department on the rear end face and all be provided with the blind hole, and two coaxial relative settings of blind hole, all be provided with the resistance foil gage in every blind hole, base member blind hole place part is I-beam structure, load seat connection is located the position between two breach structures on base member middle part top. The utility model discloses carry out pressure detection time measuring, pressure is concentrated, has improved pressure detection's sensitivity greatly.
Description
Technical Field
The utility model relates to a pressure detection field specifically is a railway rails pressure sensor.
Background
Railways are mostly used for long-distance transportation, and are rapidly developed due to high speed and low price. When the train is in an overload or unbalance loading state, traffic accidents are easily caused, and loss of life and property is easily caused. However, the detection of overload, unbalance loading and gross weight of the vehicles on the railway still adopts a parking detection mode at present, and the detection mode is troublesome and relatively lagged behind.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a railway rails pressure sensor, its pressure is concentrated during the detection, has improved pressure detection's sensitivity greatly.
The technical scheme of the utility model is that:
the utility model provides a railway track pressure sensor, including base member and load seat, the base member be the cuboid structure, two tip of base member all are provided with the bolted connection hole that link up from top to bottom, the middle part of base member and the position that is located two long limits all are provided with the breach structure for the width at base member middle part is less than the width of its two tip, preceding at base member middle part, just be located breach structure department on the rear end face and all be provided with the blind hole, and two coaxial relative settings of blind hole, all be provided with the resistance foil gage in every blind hole, base member blind hole place part is the I-beam structure, load seat connection is located the position between two breach structures on base member middle part top.
Two tip of base member be L type bent plate structure, the top surface at base member middle part and the top surface of two tip of base member are located same level, the bottom surface of two tip of base member is located same level, the level of base member middle part bottom surface is higher than the level of base member tip bottom surface, all be provided with sensor socket and the bolt connection hole that link up from top to bottom on the horizontal part of two tip of base member.
The middle part of base member and the position that is located two long limits all be provided with trapezoidal notch structure, two trapezoidal notch structures are symmetrical along base member length direction's axis, two trapezoidal notch structure's base length equals the length at base member middle part.
The height of the two trapezoid notch structures is equal to 1/6-1/5 of the width of the end part of the base body.
The resistance strain gauge is two half-bridge type resistance strain gauges, and two half-bridge type resistance strain gauges in two blind holes are connected to form a working bridge.
The utility model has the advantages that:
the utility model discloses the middle part of base member is provided with the breach structure for the width at base member middle part is less than the width of its two tip, and railway track pressure sensor carries out pressure detection time measuring, and the middle part of base member is unsettled state, makes pressure concentrate on the middle part of base member and can not produce reaction force, has improved railway track pressure sensor pressure detection's sensitivity greatly. The utility model discloses a two breachs are symmetrical along base member length direction's axis for the resistance strain gauge at base member middle part is evenly transmitted to the pressure that the load seat bore, has further improved pressure detection's accuracy.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a plan view of the present invention.
Fig. 3 is a schematic structural view of the two-piece half-bridge type resistance strain gauge of the present invention.
Fig. 4 is a schematic structural diagram of the working bridge of the present invention.
Fig. 5 is a mechanical model diagram of a load column beam.
Fig. 6 is a diagram of the strain zone position and stress distribution of the shear beam portion of the present invention.
Fig. 7 is a schematic view of the installation structure of the present invention.
Reference numerals are as follows: 1-the middle part of the base body, 2-the end part of the base body, 3-the bolt connecting hole, 4-the trapezoidal notch structure, 5-the blind hole, 6-the bearing seat, 7-the sensor socket, 8-the dowel bar, 9-the railway track pressure sensor, 10-the splint.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious 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 work belong to the protection scope of the present invention.
Referring to fig. 1 and 2, a railway track pressure sensor comprises a base body and a bearing seat, wherein the middle part 1 of the base body is a cuboid structure, two end parts 2 of the base body are L-shaped bent plate structures, the top surface of the middle part 1 of the base body and the top surfaces of the two end parts 2 of the base body are positioned at the same horizontal height, the bottom surfaces of the two end parts 2 of the base body are positioned at the same horizontal height, the horizontal height of the bottom surface of the middle part 1 of the base body is higher than the horizontal height of the bottom surfaces of the two end parts 2 of the base body, the horizontal parts of the two end parts 2 of the base body are respectively provided with a sensor socket 7 and a bolt connecting hole 3 which is communicated up and down, the positions of the middle part 1 of the base body and the two long edges are respectively provided with a trapezoidal notch structure 4, the two trapezoidal notch structures 4 are symmetrical along the central axis of the length direction of the base body, the length of the two trapezoidal notch structures 4 is equal to the length of the middle part 1 of the base body, the height of the 1/6 of the width of the end parts 2 of the base body, even make the minimum value of base member middle part 1 width be 2/3 of base member tip width, preceding at base member middle part 1, on the rear end face and be located trapezoidal breach structure department and all be provided with blind hole 5, and two blind holes 5 coaxial relative settings, all be provided with resistance strain gauge in every blind hole 5, base member blind hole place part is I-beam structure, resistance strain gauge chooses for use two half-bridge type resistance strain gauges, two half-bridge type resistance strain gauges in two blind holes 5 are connected and are constituteed the working bridge, load seat 6 is the cylinder structure, load seat 6 is connected and is located the position between two breach structures 4 on 1 top in base member middle part.
See fig. 3, the pressure sensor basic principle is similar to general strain gauge sensor, but the utility model discloses a resistance foil gage of two double strain gages, paste in the both sides of atress board. See fig. 4. in the strain gauge R, the pressure sensor is in operation 1 Such as under the action of a positive shear force,those R 2 Also subject to negative shear forces, and another R in a double strain incident 3 Under positive shear force, R 4 Under negative shear force, a working bridge is formed as shown in FIG. 4.
R is the impedance of the strain gauge, and the pressure sensor can deform when being subjected to external force, so that the impedance of the strain gauge attached to the inner wall of the pressure sensor is linearly increased or decreased. In the case of external power supply (3-12 VDC), the output differential stage mv signal also increases linearly and decreases, and after the sensor passes through bridge set, zeroing, trimming sensitivity, temperature compensation, etc., the output signal becomes the power supply voltage x sensitivity. For example, the regulated power supply is 10VDC, the sensor sensitivity is 1.5mv/V, the voltage output by the sensor to full scale is 10x1.5 to 15mv, and if a standard analog signal of 0-5V (4-20mA, etc.) is required, a signal converter (transducer) is required.
Basic mechanical principle:
the utility model discloses a pressure sensor is a board-like type roof beam and has processed two blind holes at roof beam both ends suitable position, and whole dynamometry structure is for cuting the roof beam, for the stress measurement mode of elastomer. When the pressure sensor is stressed by external force, the measured physical quantity can generate deformation (strain) on an object, and the original shape and size can be restored after the external force is removed, namely, the deformation is elastic deformation. The elastomer is one of the basic elements constituting the sensor, and has the following basic physical properties:
a. σ ═ E × ∈ is the axial stress-strain hooke's law, i.e. the elastic modulus E of an elastomer determines the linear relationship between axial stress σ and axial strain ∈.
b、ε 1 In addition to the axial strain epsilon, the elastomer is accompanied by a transverse strain epsilon under the action of the axial force 1 . The ratio of the two Poisson's ratio mu is a quotient.
c. τ is gxy, pure shear hooke's law. When the elastic body is subjected to a shearing force, the shearing stress tau on a shearing surface and the relative angular strain gamma generated between the sections are in a linear relationship, and the relative angular strain gamma depends on the elastic shearing modulus G of the elastic material.
The above; the three characteristic parameters E, G and μ of the elastic material have the following relationship:
G＝E/(2×(1+μ))。
and (3) analyzing the stress of the rail pressure sensor:
the pressure sensor of the utility model can be simplified into a shear beam or a column beam with stress concentrated loads at two ends, and the schematic diagram of a mechanical model is shown in figure 5. The shear beam pressure sensor structure deforms when being subjected to pressure, and the deformation of the shear beam pressure sensor structure is most proportional to the pressure. When the pressure sensor is deformed by pressure, the internal strain gauge is changed, and a corresponding pressure signal is output.
Secondly, calculating the stress under the action of the middle stress load:
thirdly, calculating the shearing stress and the shearing strain of the beam
In general, two blind holes (i-shaped beam is locally formed) are added at the inflection point of a strain beam in a shear beam sensor, and the shear stress of the shear beam sensor can be calculated by using a rogowski formula:
the location of the strain region and the stress distribution of the local i-beam structure are shown in fig. 6.
In the above formula:
shearing force Q:
static moment S of shear cross section to middle axis y ：
Moment of inertia J of shearing section to middle shaft y ：
Then
Calculating the principal stress and principal strain in the 45-degree direction, and the length change of the pressure in the 45-degree direction along the central axis of the beam is just the principal stress direction in the pure shearing force state, and the principal stress and the maximum shearing force are in the following relationship:
sensor sensitivity calculation:
in the formula: k-resistance strain gauge sensitivity coefficient
Technical parameters of the pressure sensor:
measuring range: (30+30) t;
accuracy 0.2% FS;
working voltage: 12 VDC;
outputting a signal: (0-10) mV;
working temperature: -20 ℃ to 70 ℃;
limiting pressure: t is more than or equal to (40+ 40);
input impedance: 700 +/-20 omega;
output impedance: 700 +/-5 omega;
insulation resistance: not less than 5000 MOmega;
non-linearity: 0.3% F · S;
hysteresis: 0.3% F · S;
repeatability: 0.5% F · S.
See fig. 7, the utility model discloses be applied to the detection of wheel pressure, railway track pressure sensor 9 installs on sleeper C, dowel steel 8 is fixed on sleeper A and B, a tip of dowel steel 8 is erect on railway track pressure sensor 9, track Ga is located sleeper A and B directly over, track Gb is located sleeper C directly over, fix by splint 10 between two track Ga and the Gb, when the vehicle passes through the track Ga of sleeper A and sleeper B top, the vehicle applys decurrent pressure to sleeper A and sleeper B through track Ga, sleeper A and sleeper B descend simultaneously (ballast is elastic below the sleeper), thereby it descends to drive dowel steel 8, the pressure that dowel steel 8 descends acts on sleeper C, the pressure change that dowel steel 8 descends transmits for railway track pressure sensor 9 promptly. According to the change of the weight of the vehicle, the signal output by the railway track pressure sensor 9 changes along with the change of the weight of the vehicle, and the pressure signal detected by the railway track pressure sensor 9 is analyzed after post-amplification treatment to determine the change of the weight of the vehicle, so that the purposes of empty and heavy loading of the vehicle container on the railway track, empty and heavy vehicle detection of the oil tank truck and the like are achieved.
Since the two rails Ga and Gb are fixed by the clamping plate 10, when the rails Ga are lowered, the rails Gb involve only partial pressure due to the presence of the gap between the two rails Ga and Gb, and have little effect on the entire inspection data.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A railway track pressure sensor, characterized by: including base member and load seat, the base member be the cuboid structure, the bolted connection hole that link up from top to bottom all is provided with to two tip of base member, the middle part of base member and the position that is located two long limits all are provided with the breach structure for the width at base member middle part is less than the width of two its tip, preceding at the base member middle part, just it all is provided with the blind hole to be located breach structure department on the rear end face, and two coaxial relative settings of blind hole, all be provided with the resistance foil gage in every blind hole, base member blind hole place part is the I-beam structure, load seat connection is located on the position between two breach structures on base member middle part top.
2. A railway track pressure sensor as claimed in claim 1, wherein: two tip of base member be L type bent plate structure, the top surface at base member middle part and the top surface of two tip of base member are located same level, the bottom surface of two tip of base member is located same level, the level of base member middle part bottom surface is higher than the level of base member tip bottom surface, all be provided with sensor socket and the bolt connection hole that link up from top to bottom on the horizontal part of two tip of base member.
3. A railway track pressure sensor as claimed in claim 1, wherein: the middle part of base member and the position that is located two long limits all be provided with trapezoidal notch structure, two trapezoidal notch structures are symmetrical along base member length direction's axis, two trapezoidal notch structure's base length equals the length at base member middle part.
4. A railway track pressure sensor as claimed in claim 3, wherein: the height of the two trapezoid notch structures is equal to 1/6-1/5 of the width of the end part of the base body.
5. A railway track pressure sensor as claimed in claim 1, wherein: the resistance strain gauge is two half-bridge type resistance strain gauges, and two half-bridge type resistance strain gauges in two blind holes are connected to form a working bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221082004.5U CN217304220U (en) | 2022-05-05 | 2022-05-05 | Railway track pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221082004.5U CN217304220U (en) | 2022-05-05 | 2022-05-05 | Railway track pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217304220U true CN217304220U (en) | 2022-08-26 |
Family
ID=82917291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221082004.5U Active CN217304220U (en) | 2022-05-05 | 2022-05-05 | Railway track pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217304220U (en) |
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2022
- 2022-05-05 CN CN202221082004.5U patent/CN217304220U/en active Active
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