CN221032762U - Strain gauge adsorption pasting device - Google Patents
Strain gauge adsorption pasting device Download PDFInfo
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- CN221032762U CN221032762U CN202323242687.3U CN202323242687U CN221032762U CN 221032762 U CN221032762 U CN 221032762U CN 202323242687 U CN202323242687 U CN 202323242687U CN 221032762 U CN221032762 U CN 221032762U
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- shell
- strain gauge
- adsorption
- tube
- strain
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- 238000001179 sorption measurement Methods 0.000 title claims abstract description 67
- 239000007787 solid Substances 0.000 claims abstract description 7
- 239000000725 suspension Substances 0.000 claims description 5
- 238000005553 drilling Methods 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 abstract description 3
- 239000011435 rock Substances 0.000 description 6
- 239000000428 dust Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The utility model discloses a strain gauge adsorption pasting device, relates to the field of measurement, and solves the problem of how to accurately and firmly paste strain gauges at the bottom of a drilling hole. The technical scheme adopted by the utility model is as follows: the strain gauge adsorption pasting device comprises a tubular shell, wherein a fan capable of forming negative pressure in the inner cavity of the shell is arranged at the rear end of the shell, a strain gauge adsorption plate is fixedly arranged at the front end of the shell, or the front end of the shell is fixedly connected with an extension tube, the lumen of the extension tube is communicated with the inner cavity of the shell and is sealed, and a strain gauge adsorption plate is fixedly arranged at one end, far away from the shell, of the extension tube; a face of the strain gauge adsorption plate, which is opposite to the shell, is a strain gauge adsorption face, the strain gauge adsorption face is a plane and is perpendicular to the central line of the shell, and the strain gauge adsorption plate comprises a filter screen area and a surrounding solid area of the filter screen area, wherein the filter screen area is directly communicated with the inner cavity of the shell or is communicated with the inner cavity of the shell through a lumen of an extension tube. The utility model is used for pasting and fixing the strain gauge on the bottom of the drilled hole.
Description
Technical Field
The utility model relates to the field of measurement, in particular to a device for sticking a strain gauge in a borehole.
Background
At present, a common method for measuring the secondary stress of a tunnel is an improved door plug type stress recovery method. When the method is used for testing the surface of the rock mass, the rock mass is required to be complete, compact and hard, the excavated rock mass is influenced by blasting unloading, a large number of unloading cracks are generated in the rock mass, the rock mass is broken, and joint cracks develop, so that a drilling machine is required to be used for constructing a drilling hole for testing in the rock mass, the drilling depth is generally 5-20 cm, the diameter is generally 5-10 cm, and a strain gauge is adhered to the bottom surface of the drilling hole. The hole bottom of the rotary hole is less affected by unloading, and the accuracy of the test can be provided. The aperture of drilling is less, is difficult to stretch the hand to the hole bottom of drilling paste the strainometer, and direct object auxiliary paste strainometer such as pole, rod, strainometer is crooked easily, is difficult to paste firmly. The strain gauge must be accurately and firmly stuck to avoid angular orientation deviation, otherwise the accuracy of the data cannot be ensured.
Disclosure of utility model
The utility model provides a strain gauge adsorption pasting device, which solves the problem of how to accurately and firmly paste strain gauges at the bottom of a drilling hole.
The technical scheme adopted by the utility model is as follows: the strain gauge adsorption pasting device comprises a tubular shell, wherein a fan capable of forming negative pressure in the inner cavity of the shell is arranged at the rear end of the shell, a strain gauge adsorption plate is fixedly arranged at the front end of the shell, or the front end of the shell is fixedly connected with an extension tube, the lumen of the extension tube is communicated with the inner cavity of the shell and is sealed, and a strain gauge adsorption plate is fixedly arranged at one end, far away from the shell, of the extension tube; a face of the strain gauge adsorption plate, which is opposite to the shell, is a strain gauge adsorption face, the strain gauge adsorption face is a plane and is perpendicular to the central line of the shell, and the strain gauge adsorption plate comprises a filter screen area and a surrounding solid area of the filter screen area, wherein the filter screen area is directly communicated with the inner cavity of the shell or is communicated with the inner cavity of the shell through a lumen of an extension tube.
To better protect the fan, further: the fan is arranged in the front end of the shell.
In order to ensure that the strain gauge can be stuck and fixed at the bottom of a drilled hole according to a preset direction, further: the strain gauge adsorption surface of the strain gauge adsorption plate is provided with a strain gauge positioning mark, and the rear end of the shell is provided with a positioning structure corresponding to the strain gauge positioning mark.
For example, the filter screen area is circular, the strain gauge positioning mark is six radially arranged positioning lines, the extension lines of the six positioning lines intersect at the center of the filter screen area, and the included angles formed by the first positioning line and the second positioning line to the sixth positioning line are 45 degrees, 135 degrees, 180 degrees, 225 degrees and 315 degrees respectively.
Specific: the positioning structure at the rear end of the shell is a level pipe or a suspension needle and a scale mark arranged at the rear end of the shell.
In order to be convenient for directly observe the depth of strain gauge adsorption paste device after inserting the drilling, further be: length scales are arranged between the strain gauge adsorption plate and the rear end of the shell.
In order to avoid that dust enters the inner cavity of the shell from the filter screen area to cause damage to the motor, further: at least one filter layer is arranged between the fan and the strain gauge adsorption plate.
In order to facilitate the quick connection of the extension tube to the housing, it is further: the front end of the shell is provided with a threaded hole, and one end of the extension tube is provided with an external thread and is connected with the threaded hole at the front end of the shell.
For example, a threaded hole is formed in the front end of the housing, and a filter layer is arranged on one side, close to the inner cavity of the housing, of the threaded hole.
In order to make the total length of the extension tube adjustable to accommodate a larger range of drilling depths, it is further: the extension pipe comprises an inner pipe and an outer pipe, the inner pipe is inserted into the outer pipe, a guide groove parallel to the central line of the extension pipe is arranged between the inner pipe and the outer pipe, and a locking piece is further arranged between the inner pipe and the outer pipe.
The beneficial effects of the utility model are as follows: after the inner cavity of the shell is made to be negative pressure by the fan, the strain gauge can be adsorbed and fixed on the strain gauge adsorption plate by being placed on the strain gauge adsorption surface, and the strain gauge can be fast and accurately stuck and fixed on the bottom of the drilled hole by means of the shell. By pressing the housing, the strain gauge can be firmly stuck and fixed to the bottom of the drilled hole. After the fan is stopped, under the action of atmospheric pressure, the adsorption effect between the strain gauge and the strain gauge adsorption surface disappears, and the shell is taken out from the drilled hole and cannot bring out the strain gauge. The strain gauge adsorption pasting device can improve the accuracy of the strain gauge pasting azimuth, and is favorable for improving the accuracy of secondary stress measurement after tunnel excavation.
Drawings
Fig. 1 is a schematic diagram of the structure of an embodiment of the present utility model.
Fig. 2 is a schematic structural view of the strain gauge suction plate in the present utility model.
Reference numerals: the device comprises a shell 1, a fan 2, a strain gauge adsorption plate 3, a filter screen area 31, a solid area 32, a positioning line 33, an extension pipe 4, a level pipe 5, a filter layer 6 and a locking piece 7.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
As shown in fig. 1, the strain gauge suction attachment device of the present utility model includes a tubular housing 1, and in order to secure the strength of the housing 1, the housing 1 is preferably made of metal, for example, the housing 1 is an aluminum housing. The two ends of the shell 1 are respectively a front end and a rear end, and the rear end of the shell 1 is provided with a fan 2 which can form negative pressure in the inner cavity of the shell 1. In order to better protect the fan 2, the problem that the fan 2 is easily damaged when being positioned outside the shell 1 is avoided, and the fan 2 is arranged inside the front end of the shell 1. The fan 2 can be provided with a storage battery, and a power line can be reserved.
The front end of the shell 1 is directly and fixedly provided with the strain gauge adsorption plate 3, the shell 1 and the strain gauge adsorption plate 3 can be an integral body, or the strain gauge adsorption plate 3 is fixedly arranged at the front end of the shell 1; or as shown in fig. 1, the front end of the casing 1 is fixedly connected with the extension pipe 4, the extension pipe 4 is used for extending the length of the casing 1, the pipe cavity of the extension pipe 4 is communicated with the inner cavity of the casing 1 and is sealed, one end, far away from the casing 1, of the extension pipe 4 is fixedly provided with the strain gauge adsorption plate 3, the strain gauge adsorption plate 3 and the extension pipe 4 can be integrated, or the strain gauge adsorption plate 3 is fixedly arranged at one end, far away from the casing 1, of the extension pipe 4. The extension tube 4 may be fixedly connected to the housing 1, such as by welding, or may be detachably connected, such as by a flange connection or a threaded connection. In order to facilitate the quick connection of the extension tube 4 and the housing 1, a threaded hole is formed in the front end of the housing 1, and one end of the extension tube 4 is provided with external threads and is connected to the threaded hole in the front end of the housing 1.
The length of the extension tube 4 may be fixed. In order to adjust the total length of the extension pipe 4 to accommodate a larger drilling depth range, referring to fig. 1, the extension pipe 4 includes an inner pipe and an outer pipe, the outer diameter of the inner pipe is identical to the inner diameter of the outer pipe, the inner pipe is inserted into the outer pipe, and a locking member 7 is further provided between the inner pipe and the outer pipe. The locking piece 7 is used for keeping the inner tube and the outer tube in a relatively fixed state, and the total length of the inner tube and the outer tube can be adjusted by loosening the locking piece 7; and the locking piece 7 is used for locking the inner tube and the outer tube relatively. In order to avoid the relative rotation of the inner tube and the outer tube, a guide groove parallel to the central line of the extension tube 4 is arranged between the inner tube and the outer tube. For example, the length of the outer tube is 140mm, the outer tube is provided with an external thread with a length of 20mm and is connected to the threaded hole at the front end of the housing 1, the length of the inner tube is 150mm, and the maximum length of the extension tube 4 is 250mm. In addition, the extension pipe 4 can also be formed by connecting at least two sections of threaded pipes end to end, and the purpose of adjusting the total length of the extension pipe 4 is realized by adjusting the number of the sections of the threaded pipes. In order to avoid that dust enters the inner cavity of the shell 1 from the filter screen area 31 to cause damage to the motor, at least one filter layer 6 is arranged between the fan 2 and the strain gauge adsorption plate 3. For example, the front end of the shell 1 is provided with a threaded hole, one side of the threaded hole, which is close to the inner cavity of the shell 1, is provided with a filter layer 6, one end of the extension tube 4 is provided with external threads and is connected with the threaded hole in front of the shell 1, and the extension tube 4 is taken down, so that dust in the extension tube 4 and in the threaded hole can be cleaned conveniently. In order to facilitate direct observation of the depth of the strain gauge adsorption pasting device inserted into the drilled hole, length scales are arranged between the strain gauge adsorption plate 3 and the rear end of the shell 1.
The strain gauge adsorption plate 3 is opposite to a plate surface of the shell 1 and is a strain gauge adsorption surface, the fan 2 enables an inner cavity of the shell 1 to be negative pressure, and the strain gauge is adsorbed and fixed on the strain gauge adsorption surface of the strain gauge adsorption plate 3, so that the strain gauge can be stuck and fixed in a drill hole with a smaller size by means of the shell 1. In order to ensure that the strain gauge is firmly attached to the strain gauge attaching surface, the strain gauge attaching surface is planar and perpendicular to the center line of the housing 1. As shown in fig. 2, the strain gage adsorption plate 3 includes a screen zone 31 and a solid zone 32 surrounding the screen zone 31, the screen zone 31 being in communication with the inner cavity of the housing 1 directly or through the lumen of the extension tube 4, the solid zone 32 being a solid plate. The screen region 31 may be of any shape, generally circular. The strain gage adsorption plate 3 may be of any shape, generally circular or rectangular. For example, the strain gauge adsorption plate 3 is rectangular, the side length of the rectangle is 30mm, the diameter of the filter screen area 31 is 15mm, and the strain gauge adsorption plate 3 is lightweight aluminum material.
In order to ensure that the strain gauge can be stuck and fixed on the bottom of a drilled hole according to a preset azimuth, a strain gauge positioning mark is arranged on the strain gauge adsorption surface of the strain gauge adsorption plate 3 and is used for assisting in adsorbing and fixing the strain gauge. The strain gauge positioning marks may be graduations, partition lines, or mark lines, etc. For example, referring to fig. 2, the filter screen area 31 is circular, the strain gauge positioning marks are six positioning lines 33 arranged radially, the extension lines of the six positioning lines 33 intersect at the center of the filter screen area 31, and the included angles formed by the first positioning line 33 and the second positioning line 33 to the sixth positioning line 33 are 45 °, 135 °, 180 °, 225 ° and 315 °, respectively. The rear end of the shell 1 is provided with a positioning structure corresponding to the strain gauge positioning mark at the same time, and the azimuth of the strain gauge positioning mark can be determined by observing the positioning structure, so that the strain gauge is ensured to be stuck and fixed according to a preset azimuth. For example, the positioning structure at the rear end of the housing 1 is a level tube 5, or a suspension needle and graduation marks arranged at the rear end of the housing 1. The suspension needle is used for providing a vertical reference line, and the vertical reference line corresponding to the suspension needle is aligned with the corresponding position of the scale mark by adjusting the shell 1, so that the strain gauge can be adhered and fixed at the bottom of the drilled hole according to a preset azimuth.
Claims (10)
1. Strain gauge adsorbs and pastes device, including tubular casing (1), its characterized in that: the rear end of the shell (1) is provided with a fan (2) which can enable the inner cavity of the shell (1) to form negative pressure, the front end of the shell (1) is fixedly provided with a strain gauge adsorption plate (3), or the front end of the shell (1) is fixedly connected with an extension tube (4), the tube cavity of the extension tube (4) is communicated with the inner cavity of the shell (1) and sealed, and one end, far away from the shell (1), of the extension tube (4) is fixedly provided with the strain gauge adsorption plate (3); a face of the strain gauge adsorption plate (3) back to the shell (1) is a strain gauge adsorption face, the strain gauge adsorption face is a plane and is perpendicular to the central line of the shell (1), the strain gauge adsorption plate (3) comprises a filter screen area (31) and a surrounding solid area (32) of the filter screen area (31), and the filter screen area (31) is directly communicated with the inner cavity of the shell (1) or is communicated with the inner cavity of the shell (1) through a pipe cavity of the extension pipe (4).
2. The strain gage adsorption pasting apparatus of claim 1, wherein: the fan (2) is arranged in the front end of the shell (1).
3. The strain gage adsorption pasting apparatus of claim 1, wherein: the strain gauge adsorption surface of the strain gauge adsorption plate (3) is provided with a strain gauge positioning mark, and the rear end of the shell (1) is provided with a positioning structure corresponding to the strain gauge positioning mark.
4. A strain gage adsorption attachment device according to claim 3, wherein: the filter screen area (31) is circular, the strain gauge positioning mark is six positioning lines (33) which are radially arranged, the extension lines of the six positioning lines (33) are intersected with the center of the filter screen area (31), and the included angles formed by the first positioning line (33) and the second positioning line (33) to the sixth positioning line (33) are 45 degrees, 135 degrees, 180 degrees, 225 degrees and 315 degrees respectively.
5. A strain gage adsorption attachment device according to claim 3, wherein: the positioning structure at the rear end of the shell (1) is a level pipe (5), or a suspension needle and a scale mark arranged at the rear end of the shell (1).
6. The strain gage adsorption pasting apparatus of claim 1, wherein: a length scale is arranged between the strain gauge adsorption plate (3) and the rear end of the shell (1).
7. The strain gage adsorption bonding device according to any one of claims 1 to 6, wherein: at least one filter layer (6) is arranged between the fan (2) and the strain gauge adsorption plate (3).
8. The strain gage adsorption attachment apparatus of claim 7, wherein: the front end of the shell (1) is provided with a threaded hole, and one end of the extension tube (4) is provided with an external thread and is connected with the threaded hole at the front end of the shell (1).
9. The strain gage adsorption attachment apparatus of claim 8, wherein: the side of the threaded hole, which is close to the inner cavity of the shell (1), is provided with a filter layer (6).
10. The strain gage adsorption bonding device according to any one of claims 1 to 6, wherein: the extension tube (4) comprises an inner tube and an outer tube, the inner tube is inserted into the outer tube, a guide groove parallel to the central line of the extension tube (4) is arranged between the inner tube and the outer tube, and a locking piece (7) is further arranged between the inner tube and the outer tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323242687.3U CN221032762U (en) | 2023-11-29 | 2023-11-29 | Strain gauge adsorption pasting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323242687.3U CN221032762U (en) | 2023-11-29 | 2023-11-29 | Strain gauge adsorption pasting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221032762U true CN221032762U (en) | 2024-05-28 |
Family
ID=91166327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323242687.3U Active CN221032762U (en) | 2023-11-29 | 2023-11-29 | Strain gauge adsorption pasting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221032762U (en) |
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2023
- 2023-11-29 CN CN202323242687.3U patent/CN221032762U/en active Active
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