CN211234793U - Grating miniature soil pressure sensor - Google Patents
Grating miniature soil pressure sensor Download PDFInfo
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- CN211234793U CN211234793U CN202020124999.1U CN202020124999U CN211234793U CN 211234793 U CN211234793 U CN 211234793U CN 202020124999 U CN202020124999 U CN 202020124999U CN 211234793 U CN211234793 U CN 211234793U
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Abstract
The utility model discloses a miniature soil pressure sensor of grating has set up the temperature compensation grating, guarantees that temperature drift is little, and the environment interference killing feature is strong, can adapt to the monitoring under the long-time adverse circumstances, has set up two end poles at the both ends of box body in addition, bonds the temperature compensation grating in the hollow structure of end pole, is favorable to reducing the volume of box body itself, reduces the thickness of box body, and diameter 25mm can be accomplished to the box body minimum dimension, can adapt to the less regional soil pressure monitoring of part.
Description
Technical Field
The utility model relates to a construction soil pressure test technical field. More specifically, the utility model relates to a miniature soil pressure sensor of grating.
Background
At present, a common soil pressure sensor is of a vibrating wire type, and soil pressure boxes are large due to the fact that the requirement of slenderness ratio must be met, so that the soil pressure sensors are not suitable for occasions of small model tests. In addition, a small strain type soil pressure cell is also provided, but the temperature drift is large based on a resistance strain gauge, the long-time monitoring performance cannot meet the engineering requirement, and the soil pressure cell cannot be made small enough in consideration of temperature compensation and an internal structure, so that the use of the sensor is greatly limited.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a miniature soil pressure sensor of grating to the temperature floats great, can not adapt to the local less regional technical problem among the solution prior art.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a grating micro soil pressure sensor, including:
the box body is provided with a vertical cylindrical through hole in the center, the upper surface of the box body is covered with a layer of metal film to seal the upper opening of the through hole, the side wall of the box body is provided with two through holes, and the two through holes are oppositely arranged and are positioned on the same diameter of the through hole;
the top cover is positioned at the lower opening of the through hole and is fixedly connected with the box body so as to seal the lower opening of the through hole;
the two end rods are respectively a left end rod and a right end rod with hollow structures, and the left end rod and the right end rod are respectively in interference fit in the two through holes;
the pressure grating is bonded on one side of the metal film in the through hole and used for generating strain along with the metal film when the metal film senses the change of soil pressure;
the temperature compensation grating is bonded in the hollow structure of the left end rod or the right end rod and is used for sensing strain generated when the temperature changes;
the pressure grating and the temperature compensation grating are connected with an external optical signal conditioning and processing device sequentially through optical fibers, and two ends of each optical fiber penetrate out of the left end rod and the right end rod respectively.
Preferably, the pressure grating is located at the center of the through hole in the horizontal direction, and the length direction of the pressure grating is consistent with the linear direction of the left end rod and the right end rod.
Preferably, the lower end of the box body is upwards sunken along the axial direction of the through hole to form a cylindrical groove communicated with the through hole, and the top cover covers the cylindrical groove and is fixedly connected with the side wall of the cylindrical groove.
Preferably, the side wall of the cylindrical groove and the surface of the side wall of the top cover are respectively provided with threads which are matched with each other, a sealant is arranged on the threads, and a sealing ring is further arranged between the horizontal plane of the cylindrical groove and the upper surface of the top cover.
Preferably, the top cap is fixed to the cylindrical recess by laser welding to seal the lower opening of the through hole.
Preferably, the outer ends of the left end rod and the right end rod are both connected with optical fiber protective sleeves.
The utility model discloses at least, include following beneficial effect: the utility model discloses a miniature soil pressure sensor of grating has set up the temperature compensation grating, and it is little to guarantee that the temperature drift is little, and environment interference killing feature is strong, can adapt to the monitoring under the long-time adverse circumstances, has set up two end poles at the both ends of box body in addition, bonds the temperature compensation grating in the hollow structure of end pole, is favorable to reducing the volume of box body itself, reduces the thickness of box body, and diameter 25mm can be accomplished to the box body minimum dimension, can adapt to the less regional soil pressure monitoring of part.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a front view structure diagram of the present invention.
The specification reference numbers indicate: 1. the box body, 2, perforating hole, 3, cylindrical recess, 4, metal film, 5, through-hole, 6, top cap, 7, left end pole, 8, right end pole, 9, pressure grating, 10, temperature compensation grating, 11, optic fibre, 12, sealing washer.
Detailed Description
The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.
In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1, the utility model discloses a miniature soil pressure sensor of grating, include:
the box body 1 is provided with a vertical cylindrical through hole 2 in the center, the upper surface of the box body 1 is covered with a layer of metal film 4 to seal the upper opening of the through hole 2, the side wall of the box body 1 is provided with two through holes 5, and the two through holes 5 are oppositely arranged and are positioned on the same diameter of the through hole 2;
a top cover 6 positioned at the lower opening of the through hole 2, the top cover 6 being fixedly connected to the box body 1 to seal the lower opening of the through hole 2;
the two end rods are respectively a left end rod 7 and a right end rod 8 with hollow structures, and the left end rod 7 and the right end rod 8 are respectively in interference fit in the two through holes 5;
the pressure grating 9 is bonded on one side of the metal film 4 in the through hole, and the pressure grating 9 is used for generating strain along with the metal film 4 when the metal film is subjected to soil pressure change;
the temperature compensation grating 10 is bonded in the hollow structure of the left end rod 7 or the right end rod 8, and the temperature compensation grating 10 is used for generating strain when sensing temperature change;
the pressure grating 9 and the temperature compensation grating 10 are connected with an external optical signal adjusting and processing device sequentially through an optical fiber 11, and two ends of the optical fiber 11 penetrate out of the left end rod 7 and the right end rod 8 respectively.
When the device is produced, the box body can be selectively processed by high-strength alloy steel, the space stability of the cylindrical through hole is ensured, the corrosion resistance is realized, after the processing, the box body, the metal film and the top cover are all subjected to heat treatment, the box body is generally selected to be circular, the pressure grating is bonded at one side of the metal film in the through hole and close to the circle center, when the grating micro soil pressure sensor device is installed, the sealing performance of each connecting part is ensured, in the embodiment, the temperature compensation grating is selected to be bonded in the hollow structure of the right end rod, the pressure grating and the temperature compensation grating are firmly bonded by adopting epoxy glue, then the optical fiber penetrates through the right end rod, the temperature compensation grating and the pressure grating are sequentially connected and then penetrate out of the left end rod, and an optical signal conditioning and processing device is connected to the outside, and then the top cover is fixed at the lower opening of the box body to seal the lower opening of the cylindrical through hole. The measuring range can be adjusted by changing the thickness of the film or the diameter of the box body, so that the measuring range and the sensitivity of the soil pressure sensor can be adjusted, and if the diameter of the box body is increased, the measuring range is larger, and the measuring range is larger.
During the use, in arranging the miniature soil pressure sensor of grating in the environment of the soil pressure that awaits measuring, act on when external soil pressure the utility model discloses a when the miniature soil pressure sensor of grating's metal film upper surface, metal film drive pressure grating sends out and meets an emergency, because the grating is sensitive to the temperature, consequently set up the temperature compensation grating in the right-hand member pole, the temperature compensation grating is not atress, temperature compensation grating and pressure grating are in the environment of same intercommunication, consequently, the temperature that receives the environment influences the same, through the influence that temperature compensation grating compensation temperature variation produced pressure grating, the total meeting an emergency that temperature compensation grating and pressure grating produced arouses optic fibre output wavelength to change, light signal mediation processing apparatus through external connection detects wavelength variation and mediates, reachs the numerical value of soil pressure.
The utility model discloses a miniature soil pressure sensor of grating has set up the temperature compensation grating, and it is little to guarantee that the temperature drift is little, and the environment interference killing feature is strong, can adapt to the monitoring under the long-time adverse circumstances, has set up two end poles at the both ends of box body in addition, bonds the temperature compensation grating in the hollow structure of end pole, is favorable to reducing the volume of box body itself, reduces the thickness of box body, and diameter 25mm can be accomplished to the box body minimum dimension, can adapt to the less regional soil pressure monitoring of part.
In another technical solution, as shown in fig. 1, the pressure grating 9 is located at the center of the through hole 2 in the horizontal direction, and the length direction of the pressure grating 9 is consistent with the linear direction of the left end rod 7 and the right end rod 8. The stress is convenient to be uniform, and the influence of the direction deviation on the detection result is avoided.
In another technical scheme, as shown in fig. 1, a cylindrical groove 3 is formed in the inner side of the lower end of the box body 1, the shape of the top cover 6 is matched with that of the cylindrical groove 3, and the top cover 6 covers the cylindrical groove 3 and is fixedly connected with the side wall of the cylindrical groove 3. The lower extreme of box body 1 upwards along the axial of perforating hole 2 sunken cylindrical recess 3 that forms and perforating hole 2 intercommunication, 6 lids of top cap close on the cylindrical recess 3 and with the lateral wall fixed connection of cylindrical recess 6. The top cover is arranged in the cylindrical groove through the cylindrical groove, so that the contact area of the top cover and the box body is increased, the sealing area is increased, the sealing effect is improved, and the top cover is conveniently aligned to the fixed installation of the position.
In another technical scheme, as shown in fig. 1, the side wall of the cylindrical groove 3 and the side wall surface of the top cover 6 are respectively provided with threads which are matched with each other, a sealant is arranged on the threads, and a sealing ring 12 is further arranged between the horizontal plane of the cylindrical groove 3 and the upper surface of the top cover 6. Make things convenient for the installation of top cap and box body through threaded connection, it is good to set up the leakproofness of the lower opening department of sealing washer, sealed glue assurance cylindrical perforating hole, selects the suitable sealing washer of size according to the diameter of box body when setting up the sealing washer, perhaps when processing the box body, is used for putting the sealing washer at the inside certain radian that caves in of cylindrical recess's bottom surface.
In another solution, the top cover 6 is fixed to the cylindrical recess 3 by laser welding to seal the lower opening of the through hole. The sealing performance between the top cover and the box body can be better ensured by adopting laser welding installation.
In another technical scheme, the outer ends of the left end rod 7 and the right end rod 8 are both connected with optical fiber protective sleeves. The optical fiber is convenient to protect the accessed optical fiber, and the detection of the wavelength is prevented from being influenced.
While the embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields where the invention is suitable, and further modifications may readily be made by those skilled in the art, and the invention is thus not limited to the specific details and herein shown and described with reference to fig. 1, without departing from the general concept as defined by the appended claims and their equivalents.
Claims (6)
1. Miniature soil pressure sensor of grating, its characterized in that includes:
the box body is provided with a vertical cylindrical through hole in the center, the upper surface of the box body is covered with a layer of metal film to seal the upper opening of the through hole, the side wall of the box body is provided with two through holes, and the two through holes are oppositely arranged and are positioned on the same diameter of the through hole;
the top cover is positioned at the lower opening of the through hole and is fixedly connected with the box body so as to seal the lower opening of the through hole;
the two end rods are respectively a left end rod and a right end rod with hollow structures, and the left end rod and the right end rod are respectively in interference fit in the two through holes;
the pressure grating is bonded on one side of the metal film in the through hole and used for generating strain along with the metal film when the metal film senses the change of soil pressure;
the temperature compensation grating is bonded in the hollow structure of the left end rod or the right end rod and is used for sensing strain generated when the temperature changes;
the pressure grating and the temperature compensation grating are connected with an external optical signal conditioning and processing device sequentially through optical fibers, and two ends of each optical fiber penetrate out of the left end rod and the right end rod respectively.
2. The grating micro-soil pressure sensor of claim 1, wherein the pressure grating is located at the center of the through hole in the horizontal direction and the length direction of the pressure grating is consistent with the straight direction of the left end rod and the right end rod.
3. The grating micro soil pressure sensor of claim 1, wherein the lower end of the box body is recessed upwards along the axial direction of the through hole to form a cylindrical groove communicated with the through hole, and the top cover covers the cylindrical groove and is fixedly connected with the side wall of the cylindrical groove.
4. The grating micro soil pressure sensor of claim 3, wherein the side wall of the cylindrical groove and the side wall surface of the top cover are respectively provided with mutually matched threads, the threads are provided with a sealant, and a sealing ring is further arranged between the horizontal plane of the cylindrical groove and the upper surface of the top cover.
5. The grating micro-soil pressure sensor of claim 3, wherein the top cap is fixed on the cylindrical groove by laser welding to seal the lower opening of the through hole.
6. The grating micro-soil pressure sensor of any one of claims 1 to 5, wherein the outer ends of the left and right end rods are connected with optical fiber protective sleeves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020124999.1U CN211234793U (en) | 2020-01-19 | 2020-01-19 | Grating miniature soil pressure sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020124999.1U CN211234793U (en) | 2020-01-19 | 2020-01-19 | Grating miniature soil pressure sensor |
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| CN211234793U true CN211234793U (en) | 2020-08-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111928983A (en) * | 2020-09-22 | 2020-11-13 | 上海建工集团股份有限公司 | Concrete formwork lateral pressure monitoring device and method |
| CN114166387A (en) * | 2021-12-16 | 2022-03-11 | 桂林汉西鸣科技有限责任公司 | Flexible press-fit outlet connector of optical fiber sensor and design, installation and maintenance method thereof |
-
2020
- 2020-01-19 CN CN202020124999.1U patent/CN211234793U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111928983A (en) * | 2020-09-22 | 2020-11-13 | 上海建工集团股份有限公司 | Concrete formwork lateral pressure monitoring device and method |
| CN111928983B (en) * | 2020-09-22 | 2021-01-05 | 上海建工集团股份有限公司 | Concrete formwork lateral pressure monitoring device and method |
| CN114166387A (en) * | 2021-12-16 | 2022-03-11 | 桂林汉西鸣科技有限责任公司 | Flexible press-fit outlet connector of optical fiber sensor and design, installation and maintenance method thereof |
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