CN113587841A - Quick centering type blast hole measuring device - Google Patents
Quick centering type blast hole measuring device Download PDFInfo
- Publication number
- CN113587841A CN113587841A CN202110918971.4A CN202110918971A CN113587841A CN 113587841 A CN113587841 A CN 113587841A CN 202110918971 A CN202110918971 A CN 202110918971A CN 113587841 A CN113587841 A CN 113587841A
- Authority
- CN
- China
- Prior art keywords
- jaw type
- support
- measuring device
- centering
- inner rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/22—Measuring arrangements characterised by the use of optical techniques for measuring depth
Abstract
A rapid centering type blast hole measuring device comprises a supporting outer sleeve, a three-jaw type supporting frame, a supporting inner rod, a three-jaw type pushing block, a centering expansion block and a laser range finder; the support outer sleeve is coaxially sleeved on the outer side of the support inner rod, the length of the support inner rod is greater than that of the support outer sleeve, and the support inner rod has axial movement freedom relative to the support outer sleeve; the three-jaw type support frame is coaxially and fixedly connected to the top end of the support outer sleeve, each support finger of the three-jaw type support frame is provided with a centering expansion block, and the centering expansion blocks have radial movement freedom relative to the three-jaw type support frame; the three-jaw type pushing block is coaxially and fixedly connected to the top end of the supporting inner rod and is positioned in the center of the three-jaw type supporting frame, and the three-jaw type pushing block and the three centering expansion blocks on the three-jaw type supporting frame are simultaneously abutted and contacted together; the laser range finder is fixedly arranged at the center of the top of the three-jaw type ejector pad. The rapid centering type blast hole measuring device has the characteristics of high measuring stability, high measuring accuracy and high measuring efficiency.
Description
Technical Field
The invention belongs to the technical field of blast hole measurement, and particularly relates to a rapid centering type blast hole measuring device.
Background
At present, the blasting technology is widely applied to places such as open mines, railways, roads, quarries and the like, wherein the drilling work is one of important links of blasting engineering, because blast holes for placing explosives or detonators need to be drilled during blasting, and the depth of the blast holes has great influence on subsequent blasting.
Under the complex working condition of the underground mine, the stability of the blast hole becomes an important factor for restricting the production blasting of the underground mine, particularly, when the blast hole is empty for a long time in the iron ore, the blast hole is easily subjected to the conditions of serious hole blocking, hole shrinkage and the like when being influenced by numerous factors such as rock mass conditions, construction disturbance and the like, so that the improvement of the working efficiency of the mine blasting is hindered, and therefore, the rapid measurement of the blast hole is very important before the charging blasting.
At the present stage, the more mainstream blast hole measurement mode is to adopt hand-held type laser drilling measuring apparatu to measure the blast hole, and in addition, when the blast hole in the face of strip mine, mainly utilize measuring rope and balancing weight to measure the blast hole, still a more simple and easy blast hole measurement mode has just utilized a plastic tubing to directly stretch into in the blast hole, stretches into length through measuring the plastic tubing and confirms the blast hole degree of depth.
However, for the manner of measuring the blast hole by using the handheld laser drilling measuring instrument, the measurement is greatly affected by the environment, the stability during measurement is poor, the measurement accuracy is often low, and the measurement efficiency is low, especially for the roadway with the height of 5m, the handheld laser drilling measuring instrument cannot measure the blast hole in the roadway, and meanwhile, the handheld laser drilling measuring instrument is only suitable for the shallow blast hole with the depth of less than 3m, and cannot meet the measurement requirement of the medium-depth blast hole.
To utilizing the measuring rope and balancing weight to the big gun hole measurement mode, only satisfy perpendicular decurrent big gun hole, and along with the increase of big gun hole measurement number of times and the aggravation of measurement task, need measure a lot of times repeatedly, will measure before the powder charge, the powder charge still needs the measurement that finishes, although the influence of measuring before the powder charge is less, nevertheless wait until the explosive and the detonator all load after finishing, when measuring this moment, if the error appears during the operation, then the balancing weight of stereoplasm causes the damage to the detonator very easily, thereby lead to the explosive can't detonate.
For the mode of directly extending a plastic pipe into a blast hole for measurement, the measurement efficiency is very low, the labor intensity is very high, and quick measurement cannot be realized.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a rapid centering type blast hole measuring device which has the characteristics of high measuring stability, high measuring accuracy and high measuring efficiency, can meet the blast hole measuring requirement in a high-altitude roadway, can meet the measuring requirement of medium-depth blast holes, and can meet the blast hole measuring requirement of any drilling angle.
In order to achieve the purpose, the invention adopts the following technical scheme: a rapid centering type blast hole measuring device comprises a supporting outer sleeve, a three-jaw type supporting frame, a supporting inner rod, a three-jaw type pushing block, a centering expansion block and a laser range finder; the support outer sleeve is coaxially sleeved on the outer side of the support inner rod, the length of the support inner rod is greater than that of the support outer sleeve, and the support inner rod has axial movement freedom relative to the support outer sleeve; the three-jaw type support frame is coaxially and fixedly connected to the top end of the support outer sleeve, each support finger of the three-jaw type support frame is provided with a centering expansion block, and the centering expansion blocks have radial movement freedom relative to the three-jaw type support frame; the three-jaw type pushing block is coaxially and fixedly connected to the top end of the support inner rod and is positioned in the center of the three-jaw type support frame, and the three-jaw type pushing block and the three centering expansion blocks on the three-jaw type support frame are simultaneously abutted and contacted together; the laser range finder is fixedly arranged at the center of the top of the three-jaw type ejector pad.
A radial sliding guide rail is fixedly arranged on the centering expansion block and adopts a parallel double-track structure; a radial sliding groove is formed in the supporting finger of the three-jaw type supporting frame, and the radial sliding groove adopts a parallel double-sliding-groove structure; the radial sliding guide rail is positioned in the radial sliding groove, and the radial sliding guide rail has a linear sliding freedom degree in the radial sliding groove.
The cross-sectional shapes of the radial sliding guide rail and the radial sliding groove are both rectangular.
An inclined sliding guide rail is fixedly arranged on the three-jaw type pushing block; an oblique sliding groove is formed in the centering expansion block; the slant sliding guide rail is positioned in the slant sliding groove, and the slant sliding guide rail has a linear sliding freedom degree in the slant sliding groove.
The cross-sectional shapes of the oblique sliding guide rail and the oblique sliding chute are both dovetail shapes.
And the top of the centering expansion block is fixedly connected with an auxiliary expansion block for increasing the contact area between the centering expansion block and the inner wall of the blast hole.
An inner rod axial limiting stop ring is fixedly arranged on the inner support rod between the three-jaw type support frame and the three-jaw type pushing block.
A wireless data transmitter is arranged in the laser range finder, and intelligent terminal equipment is arranged outside a blast hole; and the blast hole depth data measured by the laser range finder is transmitted to the intelligent terminal equipment through the wireless data transmitter, and the intelligent terminal equipment displays the blast hole depth data in real time.
The wireless data transmitter is a wireless data transmitter based on a Bluetooth transmission technology, and the intelligent terminal device is an intelligent terminal device based on the Bluetooth transmission technology.
The invention has the beneficial effects that:
the rapid centering type blast hole measuring device has the characteristics of high measuring stability, high measuring accuracy and high measuring efficiency, can meet the blast hole measuring requirement in a high-altitude roadway, can meet the measuring requirement of medium-depth blast holes, and can meet the blast hole measuring requirement of any drilling angle.
Drawings
Fig. 1 is a schematic structural diagram (view angle one) of a fast centering type blast hole measuring device according to the present invention;
fig. 2 is a schematic structural diagram (view two) of a fast centering type blast hole measuring device according to the present invention;
figure 3 is a partial cross-sectional view of a fast-centring gun hole measuring device of the invention (with the centring blooms in the minimum radial position);
figure 4 is a partial cross-sectional view of a fast-centring gun hole measuring device of the invention (with the centring blooms in the maximum radial position);
in the figure, 1-supporting outer sleeve, 2-three-jaw type supporting frame, 3-supporting inner rod, 4-three-jaw type pushing block, 5-centering expansion block, 6-laser range finder, 7-radial sliding guide rail, 8-radial sliding groove, 9-oblique sliding guide rail, 10-oblique sliding groove, 11-auxiliary expansion block and 12-inner rod axial limiting stop ring.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1 to 4, a fast centering type blast hole measuring device comprises a supporting outer sleeve 1, a three-jaw type supporting frame 2, a supporting inner rod 3, a three-jaw type pushing block 4, a centering expansion block 5 and a laser range finder 6; the support outer sleeve 1 is coaxially sleeved outside the support inner rod 3, the length of the support inner rod 3 is greater than that of the support outer sleeve 1, and the support inner rod 3 has axial movement freedom relative to the support outer sleeve 1; the three-jaw type support frame 2 is coaxially and fixedly connected to the top end of the support outer sleeve 1, each support finger of the three-jaw type support frame 2 is provided with a centering expansion block 5, and the centering expansion blocks 5 have radial movement freedom relative to the three-jaw type support frame 2; the three-jaw type pushing block 4 is coaxially and fixedly connected to the top end of the support inner rod 3 and is positioned in the center of the three-jaw type support frame 2, and the three-jaw type pushing block 4 and the three centering and expanding blocks 5 on the three-jaw type support frame 2 are simultaneously abutted and contacted together; and the laser range finder 6 is fixedly arranged at the center of the top of the three-jaw type ejector block 4.
A radial sliding guide rail 7 is fixedly arranged on the centering expansion block 5, and the radial sliding guide rail 7 adopts a parallel double-track structure; a radial sliding chute 8 is arranged on the supporting finger of the three-jaw type supporting frame 2, and the radial sliding chute 8 adopts a parallel double-sliding-chute structure; the radial sliding guide rail 7 is positioned in the radial sliding groove 8, and the radial sliding guide rail 7 has a linear sliding freedom degree in the radial sliding groove 8.
The cross sections of the radial sliding guide rail 7 and the radial sliding chute 8 are rectangular.
An inclined sliding guide rail 9 is fixedly arranged on the three-jaw type ejector block 4; an inclined sliding groove 10 is formed in the centering expansion block 5; the inclined sliding guide rail 9 is positioned in the inclined sliding groove 10, and the inclined sliding guide rail 9 has a linear sliding freedom degree in the inclined sliding groove 10.
The cross sections of the inclined sliding guide rail 9 and the inclined sliding groove 10 are both in a dovetail shape.
And the top of the centering expansion block 5 is fixedly connected with an auxiliary expansion block 11 for increasing the contact area of the centering expansion block 5 and the inner wall of the blast hole.
An inner rod axial limiting stop ring 12 is fixedly arranged on the inner support rod 3 between the three-jaw type support frame 2 and the three-jaw type pushing block 4.
A wireless data transmitter is arranged in the laser range finder 6, and intelligent terminal equipment is arranged outside a blast hole; and the blast hole depth data measured by the laser range finder 6 is transmitted to the intelligent terminal equipment through the wireless data transmitter, and the intelligent terminal equipment displays the blast hole depth data in real time.
The wireless data transmitter is a wireless data transmitter based on a Bluetooth transmission technology, and the intelligent terminal device is an intelligent terminal device based on the Bluetooth transmission technology.
The one-time use process of the present invention is described below with reference to the accompanying drawings:
take an inclined blast hole in a top plate of a high-altitude roadway as an example. When a certain blast hole needing to be measured is selected, firstly, a worker holds the bottom end of a support outer sleeve 1 by one hand, then moves the support outer sleeve 1 until a three-jaw type support frame 2 at the top end of the support outer sleeve 1 is inserted into a blast hole orifice, then, the other hand of the worker holds the top end of a support inner rod 3, then, the support inner rod 3 is pushed upwards, so that the support inner rod 3 extends upwards relative to the support outer sleeve 1, the three-jaw type pushing block 4 is synchronously driven to move upwards along the axial direction along with the movement of the support inner rod 3, in the moving process of the three-jaw type pushing block 4, the axial movement of the three-jaw type pushing block 4 is synchronously converted into the radial movement of a centering and expanding block 5 until the three centering and expanding blocks 5 abut against the inner wall of the blast hole, at the moment, the support inner rod 3 can not move continuously, and the thrust of the support inner rod 3 is kept continuously, so as to ensure that the three centering expansion blocks 5 are propped against the inner wall of the blast hole.
After three centering bloated compact 5 completely leaned on at the big gun hole inner wall, then laser range finder 6 has also realized the centering process in the big gun hole in step, later by another staff operation intelligent terminal equipment in the tunnel, and wireless remote control laser range finder 6 measures, and after the measured data of big gun hole degree of depth acquireed, can the very first time wireless transmission return intelligent terminal equipment and show in real time to the rapid survey of big gun hole has been realized.
After the acquisition of the depth data of the blast hole is finished, the inner support rod 3 is pulled reversely until the inner support rod returns to the initial position, at the moment, the three-jaw type pushing block 4 and the centering expansion block 5 can also be reset in a linkage manner, the centering expansion block 5 is separated from the inner wall of the blast hole, then the outer support sleeve 1 is moved, the three-jaw type support frame 2 is withdrawn from the measured blast hole, and the measurement work of the subsequent blast hole can be continuously finished.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Claims (9)
1. The utility model provides a quick centering formula big gun hole measuring device which characterized in that: the device comprises a supporting outer sleeve, a three-jaw type supporting frame, a supporting inner rod, a three-jaw type pushing block, a centering expansion block and a laser range finder; the support outer sleeve is coaxially sleeved on the outer side of the support inner rod, the length of the support inner rod is greater than that of the support outer sleeve, and the support inner rod has axial movement freedom relative to the support outer sleeve; the three-jaw type support frame is coaxially and fixedly connected to the top end of the support outer sleeve, each support finger of the three-jaw type support frame is provided with a centering expansion block, and the centering expansion blocks have radial movement freedom relative to the three-jaw type support frame; the three-jaw type pushing block is coaxially and fixedly connected to the top end of the support inner rod and is positioned in the center of the three-jaw type support frame, and the three-jaw type pushing block and the three centering expansion blocks on the three-jaw type support frame are simultaneously abutted and contacted together; the laser range finder is fixedly arranged at the center of the top of the three-jaw type ejector pad.
2. A rapid centring bore hole measuring device as claimed in claim 1, wherein: a radial sliding guide rail is fixedly arranged on the centering expansion block and adopts a parallel double-track structure; a radial sliding groove is formed in the supporting finger of the three-jaw type supporting frame, and the radial sliding groove adopts a parallel double-sliding-groove structure; the radial sliding guide rail is positioned in the radial sliding groove, and the radial sliding guide rail has a linear sliding freedom degree in the radial sliding groove.
3. A rapid centring bore hole measuring device as claimed in claim 2, wherein: the cross-sectional shapes of the radial sliding guide rail and the radial sliding groove are both rectangular.
4. A rapid centring bore hole measuring device as claimed in claim 1, wherein: an inclined sliding guide rail is fixedly arranged on the three-jaw type pushing block; an oblique sliding groove is formed in the centering expansion block; the slant sliding guide rail is positioned in the slant sliding groove, and the slant sliding guide rail has a linear sliding freedom degree in the slant sliding groove.
5. A fast-centring bore hole measuring device according to claim 4, wherein: the cross-sectional shapes of the oblique sliding guide rail and the oblique sliding chute are both dovetail shapes.
6. A rapid centring bore hole measuring device as claimed in claim 1, wherein: and the top of the centering expansion block is fixedly connected with an auxiliary expansion block for increasing the contact area between the centering expansion block and the inner wall of the blast hole.
7. A rapid centring bore hole measuring device as claimed in claim 1, wherein: an inner rod axial limiting stop ring is fixedly arranged on the inner support rod between the three-jaw type support frame and the three-jaw type pushing block.
8. A rapid centring bore hole measuring device as claimed in claim 1, wherein: a wireless data transmitter is arranged in the laser range finder, and intelligent terminal equipment is arranged outside a blast hole; and the blast hole depth data measured by the laser range finder is transmitted to the intelligent terminal equipment through the wireless data transmitter, and the intelligent terminal equipment displays the blast hole depth data in real time.
9. A rapid centring bore hole measuring device as claimed in claim 8, wherein: the wireless data transmitter is a wireless data transmitter based on a Bluetooth transmission technology, and the intelligent terminal device is an intelligent terminal device based on the Bluetooth transmission technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110918971.4A CN113587841A (en) | 2021-08-11 | 2021-08-11 | Quick centering type blast hole measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110918971.4A CN113587841A (en) | 2021-08-11 | 2021-08-11 | Quick centering type blast hole measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113587841A true CN113587841A (en) | 2021-11-02 |
Family
ID=78257241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110918971.4A Pending CN113587841A (en) | 2021-08-11 | 2021-08-11 | Quick centering type blast hole measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113587841A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114838679A (en) * | 2022-04-26 | 2022-08-02 | 鞍钢集团矿业有限公司 | Underground mine blast hole measuring device and using method |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201353709Y (en) * | 2009-02-19 | 2009-12-02 | 北京北内设备工具有限公司 | Self-centering device used for locating inner holes |
| CN101829794A (en) * | 2010-05-28 | 2010-09-15 | 中国航天科技集团公司长征机械厂 | Six-claw double-linkage self-centering chuck |
| CN203758404U (en) * | 2013-11-29 | 2014-08-06 | 浙江台玖精密机械有限公司 | Disc milling cutter indexing detector |
| CN205426044U (en) * | 2016-02-02 | 2016-08-03 | 南京信息职业技术学院 | Deep hole inside diameter measurement device |
| CN107127590A (en) * | 2017-06-09 | 2017-09-05 | 北京工业大学 | A kind of dexterous three-jaw automatic centring fixture of translation swallow appearance cam mandrel type |
| CN206523144U (en) * | 2017-03-04 | 2017-09-26 | 内蒙古康宁爆破有限责任公司 | Blast hole depth detection means |
| CN108871227A (en) * | 2018-09-07 | 2018-11-23 | 北方爆破科技有限公司 | A kind of hand-held blast hole depth measuring device |
| CN208968486U (en) * | 2018-09-27 | 2019-06-11 | 内蒙古生力中伟爆破有限责任公司 | Blast hole depth measuring device |
| CN110146039A (en) * | 2019-05-15 | 2019-08-20 | 南京信息职业技术学院 | The positioning device of center of circular hole axis |
| JP2019151886A (en) * | 2018-03-02 | 2019-09-12 | 株式会社Ｗａｄｅｃｏ | Surface detection device for blast furnace charge |
| CN111659915A (en) * | 2019-03-08 | 2020-09-15 | 台州市百达电器有限公司 | Numerical control machine tool clamp for machining motor shell |
-
2021
- 2021-08-11 CN CN202110918971.4A patent/CN113587841A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201353709Y (en) * | 2009-02-19 | 2009-12-02 | 北京北内设备工具有限公司 | Self-centering device used for locating inner holes |
| CN101829794A (en) * | 2010-05-28 | 2010-09-15 | 中国航天科技集团公司长征机械厂 | Six-claw double-linkage self-centering chuck |
| CN203758404U (en) * | 2013-11-29 | 2014-08-06 | 浙江台玖精密机械有限公司 | Disc milling cutter indexing detector |
| CN205426044U (en) * | 2016-02-02 | 2016-08-03 | 南京信息职业技术学院 | Deep hole inside diameter measurement device |
| CN206523144U (en) * | 2017-03-04 | 2017-09-26 | 内蒙古康宁爆破有限责任公司 | Blast hole depth detection means |
| CN107127590A (en) * | 2017-06-09 | 2017-09-05 | 北京工业大学 | A kind of dexterous three-jaw automatic centring fixture of translation swallow appearance cam mandrel type |
| JP2019151886A (en) * | 2018-03-02 | 2019-09-12 | 株式会社Ｗａｄｅｃｏ | Surface detection device for blast furnace charge |
| CN108871227A (en) * | 2018-09-07 | 2018-11-23 | 北方爆破科技有限公司 | A kind of hand-held blast hole depth measuring device |
| CN208968486U (en) * | 2018-09-27 | 2019-06-11 | 内蒙古生力中伟爆破有限责任公司 | Blast hole depth measuring device |
| CN111659915A (en) * | 2019-03-08 | 2020-09-15 | 台州市百达电器有限公司 | Numerical control machine tool clamp for machining motor shell |
| CN110146039A (en) * | 2019-05-15 | 2019-08-20 | 南京信息职业技术学院 | The positioning device of center of circular hole axis |
Non-Patent Citations (2)
| Title |
|---|
| 林茂奎: "《渐开线大花键孔的定心工具》", 《测试技术》 * |
| 赵诗若: "《基于自动定心夹紧的快速精密胀芯夹具》", 《INTERNAL COMBUSTION ENGINE & PARTS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114838679A (en) * | 2022-04-26 | 2022-08-02 | 鞍钢集团矿业有限公司 | Underground mine blast hole measuring device and using method |
| CN114838679B (en) * | 2022-04-26 | 2024-02-09 | 鞍钢集团矿业有限公司 | Underground mine blast hole measuring device and using method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103737589B (en) | The comprehensive gaging hole robot of rock mass engineering project wireless remote control | |
| US20190203594A1 (en) | Automatic method and system for detecting problematic geological formations ahead of tunnel faces | |
| CN107238538B (en) | Weak blasting induced strain type rock blasting site simulation test method | |
| CN106703795A (en) | Roof rock in the lane grade while drilling detection device and method based on laser distance meter | |
| CN113587841A (en) | Quick centering type blast hole measuring device | |
| CN102829899A (en) | Quick surrounding rock stress measuring method applicable to buried circular tunnels | |
| CN112096382B (en) | Advanced grouting reinforcement method for narrow coal pillars of gob-side roadway | |
| CN204831041U (en) | Quick powder charge auxiliary device of super large cross -section tunnel deep hole blasting | |
| CN104832163B (en) | The dangerous monitoring method of bump in a kind of coal mine underground exploitation | |
| CN106908047A (en) | To the accurate laying out apparatus of fan shape cloth hole and its application method in one kind | |
| CN109239770A (en) | One kind is with CO2Big gun is the working face lateral wall seismic detection method of focus | |
| CN109188507B (en) | Based on CO2Mine earthquake advanced detection method of cannon | |
| CN113820059A (en) | Earth stress measurement hollow inclusion positioning device and using method | |
| CN206504694U (en) | It is a kind of to implement the multi-functional laryard that blasthole is measured and explosive is lifted | |
| CN111913216B (en) | Roadway surrounding rock stability force structure cooperative monitoring method influenced by repeated mining | |
| CN204007365U (en) | A kind of cloth hole instrument that can accurately arrange surface blasting big gun hole site | |
| CN116045775A (en) | Down large-diameter blast hole depth measuring device and application method thereof | |
| CN109057777B (en) | Measuring device for drilling drift diameter description and using method thereof | |
| CN115749692A (en) | Single-channel multistage direction-control ejector, fracturing device and fracturing method | |
| CN207296976U (en) | A kind of perforation tool | |
| CN212454399U (en) | Sleeve type ground stress test matching positioning and ranging device | |
| CN211060903U (en) | Blasting hole angle measuring device | |
| CN210922492U (en) | Simple roadway surface displacement measuring device | |
| CN219826810U (en) | Simple perforation length measuring device for deep hole sectional blasting well formation | |
| CN201696030U (en) | Continuous gyro inclinometer with minor diameter and high accuracy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |