CN215672170U - Dual-induction drilling stress sensor - Google Patents
Dual-induction drilling stress sensor Download PDFInfo
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- CN215672170U CN215672170U CN202121988999.7U CN202121988999U CN215672170U CN 215672170 U CN215672170 U CN 215672170U CN 202121988999 U CN202121988999 U CN 202121988999U CN 215672170 U CN215672170 U CN 215672170U
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Abstract
The utility model provides a dual response drilling stress sensor, includes oil pocket unit, joint unit, strain body unit and housing unit, strain body unit one end opening, inside is provided with the chamber of meeting an emergency, the opening one end attach fitting unit of strain body unit, be provided with the pump oil passageway in the middle of the joint unit, the one end and the chamber of meeting an emergency of pump oil passageway are connected, and the oil pocket unit is connected to the other end, the back end outside surface of strain body unit is provided with stress detection grating, electron foil gage and temperature detection grating, cavity in the middle of the housing unit, both ends opening, the back end setting of strain body unit is in the housing unit, housing unit one end and strain body unit connection. The optical signals required by the working of the stress detection grating are modulated and demodulated by using the mining optical fiber dynamic monitoring host outside the mine, and the resistance variable quantity of the electronic strain gauge is converted into observable physical quantity by using the single chip microcomputer in the mine for displaying and outputting.
Description
Technical Field
The utility model relates to the technical field of pressure detection equipment, in particular to a dual-induction drilling stress sensor.
Background
The drilling stress sensor is a sensor for monitoring rock pressure by monitoring the stress change of the rock, and is an important component of an online mine pressure monitoring and early warning system. The method of embedding the device in the structure body monitors the residual stress borne by the structure and foundation pit, tunnel, slope and other foundation rock parts for a long time, and is effective monitoring equipment for knowing the tensile or compressive deformation force of the rock part to be monitored.
At present, most of drilling stress sensors on the market are fiber bragg grating sensors, the stress change condition of a monitored rock stratum can be obtained only by transmitting the wavelength change of light in the fiber bragg grating out of a mine and then analyzing the wavelength change of the light by a dynamic monitoring host, and constructors in the mine cannot obtain the stress change condition of the monitored rock stratum in time. Possibly, the escape probability during mine disasters is greatly reduced due to untimely information transmission.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a dual-induction borehole stress sensor, wherein a stress detection grating and an electronic strain gauge are arranged in the borehole stress sensor at the same time, the stress detection grating is connected with a dynamic monitoring host machine of an instrument outside a mine, the dynamic monitoring host machine analyzes and displays and records the wavelength change of light in the stress detection grating, the electronic strain gauge is connected with a monitoring instrument inside the mine, when the stress of a rock stratum changes, the resistance of the electronic strain gauge changes, and the monitoring instrument inside the mine can convert the stress into readable physical quantity and display the readable physical quantity.
The technical scheme of the utility model is as follows:
the utility model provides a dual response drilling stress sensor, includes oil pocket unit, joint unit, strain body unit and housing unit, strain body unit one end opening, inside is provided with the chamber of meeting an emergency, the opening one end connector unit of strain body unit, be provided with the pump oil passageway in the middle of the joint unit, the one end and the chamber of meeting an emergency of pump oil passageway are connected, and the oil pocket unit is connected to the other end, the back end outside surface of strain body unit is provided with stress detection grating, electron foil gage and temperature detection grating, cavity in the middle of the housing unit, both ends opening, the back end setting of strain body unit is in housing unit, housing unit one end and strain body unit connection, the connecting wire of stress detection grating, electron foil gage and temperature detection grating stretches out from housing unit's the other end. The drilling stress sensor is a coal mine safety monitoring sensor and can monitor the drilling stress condition. The drilling stress sensor is based on a fiber grating technology and a high-precision resistance type strain technology and is packaged by adopting full stainless steel. The optical signals required by the working of the stress detection grating are modulated and demodulated by using the mining optical fiber dynamic monitoring host outside the mine, and the resistance variable quantity of the electronic strain gauge is converted into observable physical quantity by using the single chip microcomputer in the mine for displaying and outputting.
As above, the outside of straining body unit anterior segment is provided with the screw thread, passes through threaded connection with the joint unit, the middle section of straining body unit is provided with bellied first spacing boss, the back end of straining body unit is provided with annular grating groove, the position that the back end of straining body unit is close to first spacing boss is provided with the screw thread, passes through threaded connection with housing unit.
Furthermore, the sizes of the front section and the rear section of the strain body unit are smaller than the minimum size of the first limiting boss.
Furthermore, the electronic strain gauge adopts a resistance-type strain gauge, and the electronic strain gauge is arranged around an annular shape and is tightly attached to the grating groove.
As above dual response drilling stress sensor, the joint unit anterior segment is provided with the connector, connector and oil pocket unit connection, the joint unit middle section is provided with the spacing boss of second, the joint unit end is provided with the connection tail, the outside size of connecting the tail is less than the outside size of first spacing boss, is greater than the outside size of the spacing boss of second.
Furthermore, run through in the middle of connector and the spacing boss of second and be provided with the pump oil passageway, the connection tail passes through threaded connection with the front end of straining body unit.
Furthermore, a connecting cavity is arranged in the connecting tail, a sealing gasket is arranged in the connecting cavity, and the diameter of the sealing gasket is larger than that of the strain cavity.
Furthermore, the center of the sealing gasket is provided with an opening, and the size of the opening is not smaller than that of the oil pumping channel.
Preferably, the joint unit, the strain body unit and the shell unit are integrally made of 304 stainless steel, so that the sensor can be applied to complex environments.
Further, the drilling stress sensor adopts a cylindrical thin-wall strain principle, when the oil pocket unit is pressed, the oil pressure enables the thin wall of the strain body unit to generate strain, the wavelength of light in the stress detection grating attached to the strain body unit is changed, and meanwhile, the resistance of the electronic strain gauge attached to the strain body unit is also changed. The dynamic monitoring host machine outside the mine connected with the stress detection grating can modulate and demodulate the stress change in the drill hole through the wavelength change of light in the grating, and the singlechip arranged in the mine and connected with the electronic strain gauge can convert the resistance change of the electronic strain gauge into physical quantity which can be visually displayed and display the physical quantity on a screen in the mine.
Compared with the prior art, the utility model has the advantages that:
the dual-induction drilling stress sensor is simple in structure, accurate in measurement, convenient to install, stable, reliable and wide in application range. The dual-induction drilling stress sensor is additionally provided with the electronic strain gauge on the basis of the original fiber grating type drilling stress sensor, and according to the principle that the resistance of the electronic strain gauge can change along with the stress change borne by the strain body unit, the resistance variable quantity of the electronic strain gauge is converted into observable physical quantity by the single chip microcomputer to be displayed on a screen in a mine in real time. When the stress in the drill hole changes, the drill hole stress sensor can simultaneously inform the mine inside and outside, so that the escape rate in mine accidents is improved.
Drawings
The aspects and advantages of the present application will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model.
In the drawings:
fig. 1 is a schematic structural diagram of a dual induction borehole stress sensor according to embodiment 1;
FIG. 2 is a cross-sectional view of a dual induction borehole stress sensor in accordance with example 1;
FIG. 3 is a sectional view of a joint unit in example 1;
FIG. 4 is a sectional view of a strain body unit in example 1;
FIG. 5 is a schematic view showing the installation of a stress detection grating and an electronic strain gauge in example 1;
fig. 6 is a sectional view of the housing unit in embodiment 1;
FIG. 7 is a schematic structural view of an electronic strain gauge in example 1;
the components represented by the reference numerals in the figures are:
1. the oil package unit comprises a 2, a connector unit, 21, an oil pumping channel, 22, a connector, 23, a second limiting boss, 24, a connection tail, 25, a connection cavity, 26, a sealing gasket, 3, a strain body unit, 31, a strain cavity, 32, a stress detection grating, 33, an electronic strain gauge, 34, a temperature detection grating, 35, a first limiting boss, 36, a grating groove, 4, a shell unit, 41, an outlet, 5, a cable, 6 and a copper pipe.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that these embodiments are provided so that this disclosure can be more completely understood and fully conveyed to those skilled in the art, and the present disclosure may be implemented in various forms without being limited to the embodiments set forth herein.
The directions "front and back", "left and right", etc. mentioned in the present invention are only used to express the relative positional relationship, and are not restricted by any specific directional references in practical application.
Example 1
Referring to fig. 1-7, a dual induction borehole stress sensor comprises an oil pocket unit 1, a joint unit 2, a strain body unit 3 and a housing unit 4, one end of the strain body unit 3 is open, a strain chamber 31 is arranged in the strain body unit 3, one end of the open end of the strain body unit 3 is connected with the joint unit 2, the middle of the joint unit 2 is provided with an oil pumping channel 21, one end of the oil pumping channel 21 is connected with the strain chamber 31, the other end is connected with the oil pocket unit 1, the outer side surface of the rear section of the strain body unit 3 is provided with a stress detection grating 32, an electronic strain gauge 33 and a temperature detection grating 34, the shell unit 4 is hollow in the middle and is opened at two ends, the rear section of the strain body unit 3 is arranged in the shell unit 4, one end of the shell unit 4 is connected with the strain body unit 3, and the connecting lines of the stress detection grating 32, the electronic strain gauge 33 and the temperature detection grating 34 extend out of the other end of the shell unit 4. The drilling stress sensor is a coal mine safety monitoring sensor and can monitor the drilling stress condition. The drilling stress sensor is based on a fiber grating technology and a high-precision resistance type strain technology and is packaged by adopting full stainless steel. The optical signals required by the working of the stress detection grating 32 are modulated and demodulated by using a mining optical fiber dynamic monitoring host outside a mine, and the resistance variable quantity of the electronic strain gauge 33 is converted into observable physical quantity by using a single chip microcomputer in the mine for displaying and outputting.
Referring to fig. 6, an outlet 41 is provided at the rear of the housing unit 4, the stress detection grating 32, the electronic strain gauge 33 and the temperature detection grating 34 are imported into the cable 5 from the outlet 41, a connection optical cable of the stress detection grating 32 and the temperature detection grating 34 in the cable 5 is connected with a dynamic monitoring host outside the mine, the temperature detection grating 34 mainly performs temperature compensation on the stress detection grating 32, the influence of the temperature on the stress detection grating 32 is reduced, and a connection electric wire of the electronic strain gauge 33 in the cable 5 is connected with a single chip microcomputer inside the mine.
Referring to fig. 4, the outer side of the front section of the strain body unit 3 is provided with a thread, and is in threaded connection with the joint unit 2, the middle section of the strain body unit 3 is provided with a first protruding limiting boss 35, the rear section of the strain body unit 3 is provided with an annular grating groove 36, and the position of the rear section of the strain body unit 3, which is close to the first limiting boss 35, is provided with a thread, and is in threaded connection with the housing unit 4.
Further, the sizes of the front section and the rear section of the strain body unit 3 are smaller than the minimum size of the first limiting boss 35, so that the first limiting boss 35 protrudes outwards relative to the joint unit 2 and the shell unit 4, and the joint unit 2, the strain body unit 3 and the shell unit 4 are conveniently connected together in a threaded manner.
Further, electron foil gage 33 adopts resistance-type foil gage, electron foil gage 33 is hugged closely grating groove 36 around becoming the annular and is set up, stress detection grating 32 sets up in grating groove 36, temperature detection grating 34 sets up the afterbody at the foil gage unit 3, prevents that the deformation of foil gage unit 3 from influencing the detection of temperature detection grating 34.
Preferably, the electronic strain gauge 33 in this embodiment is a high-precision resistance-type strain gauge with BF350-6AA specific model.
Referring to fig. 3, the front section of the joint unit 2 is provided with a joint 22, in this embodiment, the joint 22 is connected with the oil pack unit 1 through a copper pipe 6, the middle section of the joint unit 2 is provided with a second limit boss 23, the end of the joint unit 2 is provided with a joint tail 24, and the outside dimension of the joint tail 24 is smaller than the outside dimension of the first limit boss 35 and larger than the outside dimension of the second limit boss 23.
Further, the middle of connector 22 and the spacing boss 23 of second runs through and is provided with pump oil passageway 21, connect tail 24 and pass through threaded connection with the front end of straining body unit 3.
Further, a connecting cavity 25 is arranged in the connecting tail 24, a sealing gasket 26 is arranged in the connecting cavity 25, and the diameter of the sealing gasket 26 is larger than that of the strain cavity 31.
Further, the center of the seal gasket 26 is provided with an opening having a size not smaller than the size of the pump oil passage 21.
Preferably, the joint unit 2, the strain body unit 3 and the housing unit 4 are integrally made of 304 stainless steel, so that the sensor can be applied to a complicated environment.
Furthermore, before the drilling stress sensor is used, a hole needs to be drilled in a mine roadway, the oil pocket unit 1 is placed in the hole of the roadway, then the hydraulic oil is filled into the oil pocket unit 1, the oil pocket unit 1 is expanded and fixed in the hole, and when the standard pressure is reached, the hydraulic oil injection is stopped.
Further, the drilling stress sensor adopts a cylindrical thin-wall strain principle, when the oil pocket unit 1 is pressed, the oil pressure causes the thin wall of the strain body unit 3 to generate strain, the wavelength of light in the stress detection grating 32 attached to the upper surface is changed, and simultaneously the resistance of the electronic strain gauge 33 attached to the upper surface is also changed. The dynamic monitoring host outside the mine connected with the stress detection grating 32 can modulate and demodulate the stress change in the drill hole through the wavelength change of light in the grating, and the singlechip arranged in the mine and connected with the electronic strain gauge 33 can convert the resistance change of the electronic strain gauge 33 into physical quantity which can be visually displayed and display the physical quantity on a screen in the mine.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or additions or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A dual-induction drilling stress sensor is characterized by comprising an oil pocket unit, a joint unit, a strain body unit and a shell unit, one end of the strain body unit is opened, a strain chamber is arranged in the strain body unit, one end of the opening of the strain body unit is connected with the joint unit, an oil pumping channel is arranged in the middle of the joint unit, one end of the oil pumping channel is connected with the strain chamber, the other end of the oil pumping channel is connected with the oil pocket unit, the outer side surface of the rear section of the strain body unit is provided with a stress detection grating, an electronic strain gauge and a temperature detection grating, the middle of the shell unit is hollow, two ends of the shell unit are open, the rear section of the strain body unit is arranged in the shell unit, casing unit one end and the connection of straining body unit, the connecting wire of stress detection grating, electron foil gage and temperature detection grating stretches out from the other end of casing unit.
2. The dual-induction drilling stress sensor of claim 1, wherein the outer side of the front section of the strain body unit is provided with a screw thread and is connected with the joint unit through the screw thread, the middle section of the strain body unit is provided with a first protruding limiting boss, the rear section of the strain body unit is provided with an annular grating groove, and the position of the rear section of the strain body unit, which is close to the first limiting boss, is provided with a screw thread and is connected with the shell unit through the screw thread.
3. A dual induction borehole stress sensor according to claim 2, wherein the size of the front and rear sections of the strain body unit of the limiting boss is smaller than the minimum size of the first limiting boss.
4. The dual induction borehole stress sensor of claim 2, wherein said electronic strain gage comprises a resistive strain gage, said electronic strain gage being disposed around said annular grating groove.
5. The dual-induction drilling stress sensor according to claim 2, wherein the front section of the joint unit is provided with a joint, the joint is connected with the oil pocket unit, the middle section of the joint unit is provided with a second limit boss, the tail end of the joint unit is provided with a joint tail, and the outer dimension of the joint tail is smaller than that of the first limit boss and larger than that of the second limit boss.
6. The dual-induction drilling stress sensor according to claim 5, wherein an oil pumping channel is arranged between the connector and the second limiting boss in a penetrating manner, and the connection tail is in threaded connection with the front end of the strain body unit.
7. The dual induction borehole stress sensor of claim 6, wherein said connection tail has a connection cavity therein, and wherein a seal is disposed in said connection cavity, said seal having a diameter greater than a diameter of said strain cavity.
8. The dual induction borehole stress sensor according to claim 7, wherein said gasket is provided with an opening in the center, the size of said opening being not smaller than the size of said pumping oil passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121988999.7U CN215672170U (en) | 2021-08-23 | 2021-08-23 | Dual-induction drilling stress sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121988999.7U CN215672170U (en) | 2021-08-23 | 2021-08-23 | Dual-induction drilling stress sensor |
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| CN215672170U true CN215672170U (en) | 2022-01-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115095316A (en) * | 2022-06-20 | 2022-09-23 | 山东道宽智能科技有限公司 | Waterproof mining optical fiber drilling stress sensor based on 5G fusion technology |
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2021
- 2021-08-23 CN CN202121988999.7U patent/CN215672170U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115095316A (en) * | 2022-06-20 | 2022-09-23 | 山东道宽智能科技有限公司 | Waterproof mining optical fiber drilling stress sensor based on 5G fusion technology |
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