CN209317867U - A kind of underground is crushed drop shaft level-sensing device and fixes and lifting device - Google Patents
A kind of underground is crushed drop shaft level-sensing device and fixes and lifting device Download PDFInfo
- Publication number
- CN209317867U CN209317867U CN201821758716.8U CN201821758716U CN209317867U CN 209317867 U CN209317867 U CN 209317867U CN 201821758716 U CN201821758716 U CN 201821758716U CN 209317867 U CN209317867 U CN 209317867U
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- level
- sensing device
- hole
- fixed
- drop shaft
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- 230000001681 protective effect Effects 0.000 claims abstract description 18
- 239000011435 rock Substances 0.000 claims abstract description 18
- 210000003205 muscle Anatomy 0.000 claims description 10
- 239000004570 mortar (masonry) Substances 0.000 claims description 6
- 230000010412 perfusion Effects 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 11
- 230000006378 damage Effects 0.000 description 8
- 238000005065 mining Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 208000033999 Device damage Diseases 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000001320 hippocampus Anatomy 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
Drop shaft level-sensing device is crushed the utility model relates to a kind of underground to fix and lifting device; including the perforation circular hole and radar level gauge on rock stratum right above setting drop shaft; it is characterized by: being equipped in the perforation circular hole, level-sensing device fixes device and level-sensing device lifting device, the fixation device include branch pillar, lower pallet, level-sensing device fixed plate, protective cover and upper cover plate；The lifting device includes main push-towing rope rope and winch hoister, is connected at the top of the main push-towing rope rope lower end and protective cover, the central through hole that upper end passes through upper cover plate is connect with winch hoister.The utility model has the advantage that the capital construction cost for saving aperture, while the radar wave for being able to achieve level-sensing device is not blocked, and realizes accurate measurement；The protection that level-sensing device improves, repair and maintenance is convenient, enhances the reliability and convenience of detection.
Description
Technical field
The utility model belongs to mining industry underground crushing technology field, and in particular to a kind of broken drop shaft level-sensing device in underground
Fixed and lifting device.
Background technique
It is opened currently, usually the coarse crushing operation for originally belonging to mining processing industry moves forward in mining industry underground mining for underground
The final stage operation adopted.The broken process in underground as shown in Figure 1, the block material of underground mining respectively from two top ore storage bins
11 slide down, and are crushed by feeding device 12 into crusher 13, broken material passes through inclined channel 14 respectively
Converge and enter the i.e. described drop shaft 15 of lower part ore storage bin, into next process procedure, since drop shaft 15 is very high, the material of coarse crushing product
Granularity is also bigger, if material position is too low in drop shaft 15, material is directly pounded in the equipment of next process procedure, be easy to cause and sets
Standby damage.Therefore 15 material position of real-time detection drop shaft is needed in production, when material position is lower than a certain setting value alarm, such as fruit
When position is lower than the critical value of setting again, interlocking stops crusher 13 and feeding device 12.
The detection of drop shaft material position in mining production is realized using radar level gauge 17, since drop shaft 15 is not vertical
, if level-sensing device to be mounted on to 13 lower section of crusher, radar wave can not be irradiated to the bottom of drop shaft 15, so radar material
Position meter 17 can be only installed at the appropriate location of the surface of drop shaft 15, however there is the rock of 12m thickness in this position, it is necessary in rock
It is upper to make a call to a perforation circular hole 16, radar level gauge 17 is placed in petrosal foramen, the radar wave of radar level gauge 17 can just be irradiated to and slip
Well 15.Since radar wave has an angle of departure α, as shown in Fig. 2, it is too small to hold petrosal foramen, hole wall can block radar wave (∠ in such as Fig. 2
AOB), it is excessive and will increase infrastructure project amount to open petrosal foramen, so this petrosal foramen will be before guaranteeing not impact radar wave
It puts small as far as possible.If level-sensing device 17 is placed on O horizontal plane:
Here H=12(m), α takes 4 ° of the smallest field angle of current radar level gauge, then R=419 (mm), at this moment needs out one
A at least petrosal foramen of 838mm, and radar level gauge 17 must assure that otherwise radar wave will be by hole absolutely between two parties during installation
Wall is blocked, and measurement error is caused, this is difficult to accomplish in practice, it is necessary to be continued to expand by petrosal foramen, unnecessarily be increased capital construction work
Cheng Liang causes to waste.
If using laser material position meter, due to the characteristic of laser linear transmission, although can solve the angle of departure by well bore wall
The problem of blocking, but since laser is poor to dust penetrability, it is unable to measure, can not apply in this field substantially in the big occasion of ash
It closes.
In addition, the selection of radar level gauge lowered position is also critically important, if level-sensing device decentralization is too low, in blanking
The splashing of material is possible to injure level-sensing device by a crashing object in journey；If level-sensing device decentralization is too high, it is possible to block the radar wave of level-sensing device.
The maintenance and replacement of level-sensing device are also very important, and due to measured hole aperture very little, also without ladder, people can not
Can descend the place to 12m go maintenance level-sensing device, it is necessary to have a kind of device level-sensing device can smoothly be transferred to designated position into
Row measurement, what be can be convenient when needing to overhaul and replace is promoted to earth's surface, and can guarantee smooth in small space
It promotes level-sensing device to damage without making it collide with well bore wall, once otherwise level-sensing device damages, which will be unable to take
Out, it will thoroughly discard, can only be punched again together with measured hole, and reinstall new level-sensing device, and not only waste infrastructure project amount, but also
Level-sensing device is wasted, the material position hole reselected is not most ideal position, it is inaccurate to lead to follow-up data, and due to temporary
Lack the measured value of level-sensing device, it will influence the stable operation of entire process system.
Since level-sensing device decentralization is very deep, level-sensing device also can be smashed often by the falling rocks of 0m plane, also have water sometimes from material
Position measurement metering-orifice gutters down, and causes to impact to level-sensing device, and long-term flowing water also be easy to cause the short trouble etc. of level-sensing device.
Summary of the invention
That the purpose of the utility model is to provide a kind of infrastructure project amounts is small, structure is simple, anti-pounds waterproof, debugging and maintenance side
Just the broken drop shaft level-sensing device in underground is fixed and lifting device.
The purpose of this utility model is achieved through the following technical solutions:
A kind of broken drop shaft level-sensing device in underground of the utility model is fixed and lifting device, including is arranged right above drop shaft
Perforation circular hole and radar level gauge in rock stratum, it is characterised in that: the perforation circular hole top is arranged lower than rock stratum earth's surface,
It is equipped with the fixed device of level-sensing device and level-sensing device lifting device in the perforation circular hole, well lid formula lid is equipped on top stratum
Plate；
The fixed device of the level-sensing device includes branch pillar, lower pallet, level-sensing device fixed plate, protective cover and upper cover plate；Institute
The branch pillar stated is fixed in perforation circular hole with one heart by perfusion mortar, and the lower pallet, which is greater than, penetrates through circular hole, under branch pillar
End and the lower end of perforation circular hole are placed on lower pallet, weld annular array dowel at lower pallet edge, and pass through perfusion mortar
It is fixed in rock stratum, level-sensing device fixed plate is concentrically disposed in the top of lower pallet, and the upper cover plate concentric vertical abuts against supporting
Pipe upper end, and be fixedly connected with perforation circular hole top periphery pre-embedded bolt, make to constitute cylindrical cavity in branch pillar, in upper cover plate
On be disposed with center preformed hole, and be arranged middle part dowel bar；
The protective cover covers on level-sensing device, and lower end is fixed in level-sensing device fixed plate by bolt；It is protecting
The top of cover is equipped with hanging ring, and in protective cover side, there are preformed holes, in the lower pallet, level-sensing device fixed plate and upper cover plate
The heart is provided with central through hole；
The level-sensing device lifting device includes main hoist system and auxiliary lifting auxiliary system, and the main hoist system includes setting
Bower Anchor muscle bar, main hook and the hoisting mechanism on upper cover plate top are set, the main push-towing rope rope in branch pillar, the main push-towing rope rope are set
Lower end is connected with the hanging ring at the top of protective cover, and the preformed hole that upper end passes through upper cover plate is mounted by main hook and Bower Anchor muscle bar.
The secondary lift system is two secondary lift systems for being symmetricly set on main hoist system two sides, Mei Gefu
Helping lifting system includes auxiliary dowel bar, auxiliary cables, auxiliary hook and plummet, is equipped with and center preformed hole two on upper cover plate
The symmetrical two hawser through-holes in side, the two sides of Bower Anchor muscle bar are arranged in two auxiliary dowel bars, in the lower pallet and material position
It symmetrically opens there are two auxiliary cables through-hole the central through hole two sides of meter fixed plate；The upper end of two auxiliary cables passes through upper cover plate
Two hawser through-holes be connected by auxiliary hook with hoisting mechanism, the lower end of two auxiliary cables is corresponding in turn to across subiculum
Two hawser through-holes on plate and level-sensing device fixed plate are arranged with lower end to be connected in plummet.
The lower pallet central through hole > level-sensing device fixed plate central through hole.
The plummet diameter of the auxiliary cables lower end < lower pallet hawser through-hole diameter；The plummet of auxiliary cables lower end is straight
Diameter > level-sensing device fixed plate hawser through-hole diameter.
The level-sensing device fixed plate is an and size matched round supporting plate concentric with branch pillar.
The branch pillar is using preferably to a steel pipe for model Q235 carbon steel
The main push-towing rope rope uses wirerope, and auxiliary cables use glass cord.
Compared with prior art, the utility model has the advantage that
1, the radar wave of the capital construction cost and radar level gauge that can save drop shaft aperture is not blocked, and realizes
The accurate measurement of drop shaft material position solves the feasibility and economy problems that level-sensing device is arranged under mal-condition；
2, position is fixedly mounted in Rational choice level-sensing device, avoids the splashing of material in blanking process from injuring level-sensing device by a crashing object, simultaneously
Guarantee that level-sensing device mirror surface is straight, is conducive to the transmission of radar signal；
3, protective device is set for level-sensing device, due to colliding or inclining during can both preventing promotion and transferring level-sensing device
Tiltedly equal damage level-sensing device, and damage of the top infiltration to level-sensing device circuit and falling rocks can be prevented to the mechanical damage of level-sensing device,
Guarantee the stable operation of level-sensing device；
4, use the fixed device of level-sensing device and embedded steel tube cooperation as channel is promoted, reduce frictional resistance, avoid material
Damage in the meter lifting process of position to level-sensing device；
5, lifting system is designed using main push-towing rope rope and back up cable dual fail-safe, when main hoist system breaks down or anticipates
Outside, level-sensing device is taken out using flexible channel, back up cable usually can be used as flexible cage guide and use, and can make lifting process more
Add steadily, hoisting way can be using modes such as artificial, hoist engine or cranes；
6, level-sensing device is fixed and lifting device dismounting is flexible, it is convenient to be promoted, and greatly enhances level-sensing device maintenance and maintenance
Convenience and reliability, the problem of very good solution level-sensing device mentions to come up once and cancels detection hole.
Detailed description of the invention
Fig. 1 is that prior art radar level-sensing device is placed on the schematic diagram in petrosal foramen.
Fig. 2 is level-sensing device field angle schematic diagram.
Fig. 3 fixes for the broken drop shaft level-sensing device in the utility model underground and lifting device structural schematic diagram.
Fig. 4 is the A-A view of Fig. 3.
Fig. 5 is the portion the B enlarged drawing of Fig. 3.
Fig. 6 is the portion the C enlarged drawing of Fig. 3.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing:
As shown in Fig. 1, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, a kind of underground of the utility model be crushed drop shaft level-sensing device fix and
Lifting device, including the perforation circular hole 16 and radar level gauge 17 being arranged in 15 surface rock stratum 18 of drop shaft, it is characterised in that:
16 top of perforation circular hole is arranged lower than rock stratum earth's surface 19, and the fixed device of level-sensing device is equipped in the perforation circular hole 16
With level-sensing device lifting device, well lid formula cover board 20 is equipped in rock stratum earth's surface 19；
The fixed device of the level-sensing device include branch pillar 21, lower pallet 24, level-sensing device fixed plate 23, protective cover 22 and on
Cover board 25；The branch pillar 21 is fixed in perforation circular hole 16 with one heart by perfusion mortar, and the lower pallet 24, which is greater than, to be passed through
The lower end of logical circular hole 16,21 lower end of branch pillar and perforation circular hole 16 is placed on lower pallet 24, in 24 edge welding ring of lower pallet
Shape array dowel 26, and be fixed in rock stratum 18 by perfusion mortar, level-sensing device fixed plate 23 is concentrically disposed in the upper of lower pallet 24
Portion, the level-sensing device fixed plate 23 are an and size matched round supporting plate concentric with branch pillar 21；The upper cover plate 25
Concentric vertical abuts against 21 upper end of branch pillar, and is fixedly connected with perforation circular hole top periphery pre-embedded bolt, makes in branch pillar 21
Cylindrical cavity is constituted, center preformed hole is disposed on upper cover plate 21；
On the one hand the effect of the utility model lower pallet is to undertake level-sensing device, protective device and other construction weights, another
Aspect is then adjustment level-sensing device mirror position, avoids mirror position from excessively declining by the destruction for the work stone that flies up, is meeting function
Under the premise of capable of requiring, reasonable mirror surface height is kept.
Protective cover 22 described in the utility model covers on level-sensing device 17, and lower end is fixed in level-sensing device by bolt and consolidates
On fixed board 23；It is equipped with hanging ring at the top of protective cover 22, in protective cover side there are preformed hole 27, facilitates cable and level-sensing device
Connection；Central through hole is provided at the lower pallet 24, level-sensing device fixed plate 23 and 25 center of upper cover plate；The lower pallet
Central through hole > level-sensing device fixed plate central through hole, is conducive to material position in this way and counts accurately.
Level-sensing device lifting device described in the utility model includes main hoist system and auxiliary lifting auxiliary system, the main promotion
System includes Bower Anchor muscle bar 33, main hook 32 and the hoisting mechanism that 25 top of upper cover plate is arranged in, and is arranged in branch pillar 21
Main push-towing rope rope 31,31 lower end of main push-towing rope rope are connected with the hanging ring at 22 top of protective cover, and upper end passes through the preformed hole of upper cover plate 25
It is mounted by main hook 32 and Bower Anchor muscle bar 33.The main push-towing rope rope 31 of the utility model uses wirerope, and hoisting mechanism is
Winch hoister or crane elevator, are not shown in the figure, and can also use artificial lift.When needing to be promoted, main hook 32 is connected
It is connected on the lifting means such as hoist engine.
The level-sensing device fixed plate 23 of the utility model is mainly used for fixed level-sensing device, at the same can guarantee promoted and under
During putting, only level-sensing device fixed plate and steel pipe are collided, and prevent the damage of level-sensing device, while playing stable lifting device
Effect prevents whole device in lifting process from tilting or being stuck in channel.
As advanced optimizing for above scheme, secondary lift system described in the utility model is to be symmetricly set on master to mention
Two secondary lift systems of system two sides are risen, each secondary lift system includes auxiliary dowel bar 42, auxiliary cables 41, auxiliary
Hook 43 and plummet 44 are equipped with and the monosymmetric two hawser through-holes of center preformed hole, two piggy-back anchors on upper cover plate 25
The two sides of Bower Anchor muscle bar 33 are arranged in muscle bar 42, equal in the central through hole two sides of the lower pallet 24 and level-sensing device fixed plate 23
Auxiliary cables through-hole there are two symmetrically opening；Two hawser through-holes that the upper end of two auxiliary cables 41 passes through upper cover plate pass through auxiliary
Hook 43 is connected with hoisting mechanism, and the lower end of two auxiliary cables 41 is corresponding in turn to across lower pallet 24 and level-sensing device fixed plate
Two hawser through-holes on 23 are arranged with lower end to be connected in plummet 44.
The diameter of auxiliary cables lower end described in the utility model plummet 44 < lower pallet hawser through-hole diameter；Auxiliary cables
44 diameters of plummet of lower end > level-sensing device fixed plate hawser through-hole diameter.
Two auxiliary cables of the utility model use glass cord, have under the premise of guaranteeing solid etch-proof
Function, because auxiliary cables are placed on water for a long time and have in the environment of dirt, it is easy to be corroded, auxiliary cables are usually used as flexible tank
Road uses, and when main hoist system breaks down or unexpected, can enable secondary lift system, using flexible channel by level-sensing device
It takes out.
In order to prevent entire lifting system from protruding earth's surface, otherwise it is easy to be damaged by pressure by passing vehicle, the utility model institute
16 top of perforation circular hole stated is arranged lower than rock stratum earth's surface 19, be equipped in the perforation circular hole 16 the fixed device of level-sensing device and
Level-sensing device lifting device is equipped with well lid formula cover board 20 in rock stratum earth's surface 19.This well lid design makes entirely fixed and is promoted
Device is lower than earth's surface, and is covered with well lid, keeps earth's surface horizontal, when needing to overhaul, opens well lid.
Claims (7)
1. a kind of underground is crushed, drop shaft level-sensing device is fixed and lifting device, the perforation including being arranged in right above drop shaft in rock stratum are round
Hole and radar level gauge, it is characterised in that: the perforation circular hole top is arranged lower than rock stratum earth's surface, in the perforation circular hole
It is interior to be equipped with the fixed device of level-sensing device and level-sensing device lifting device, well lid formula cover board is equipped in the earth's surface of rock stratum；
The fixed device of the level-sensing device includes branch pillar, lower pallet, level-sensing device fixed plate, protective cover and upper cover plate；Described
Branch pillar by perfusion mortar be fixed in one heart perforation circular hole in, the lower pallet be greater than perforation circular hole, branch pillar lower end and
The lower end of perforation circular hole is placed on lower pallet, welds annular array dowel at lower pallet edge, and affixed by perfusion mortar
In rock stratum, level-sensing device fixed plate is concentrically disposed in the top of lower pallet, and the upper cover plate concentric vertical abuts against on branch pillar
End, and be fixedly connected with perforation circular hole top periphery pre-embedded bolt, make to constitute cylindrical cavity, the cloth on upper cover plate in branch pillar
It is equipped with center preformed hole, and middle part dowel bar is set；
The protective cover covers on level-sensing device, and lower end is fixed in level-sensing device fixed plate by bolt；In protective cover
Top is equipped with hanging ring, and in protective cover side, there are preformed holes, equal at the lower pallet, level-sensing device fixed plate and upper cover plate center
It is provided with central through hole；
The level-sensing device lifting device includes main hoist system and secondary lift system, and the main hoist system includes setting
Bower Anchor muscle bar, main hook and hoisting mechanism on upper cover plate top, are arranged in the main push-towing rope rope in branch pillar, under the main push-towing rope rope
End is connected with the hanging ring at the top of protective cover, and the preformed hole that upper end passes through upper cover plate is mounted by main hook and Bower Anchor muscle bar.
2. a kind of broken drop shaft level-sensing device in underground according to claim 1 is fixed and lifting device, it is characterised in that: described
Secondary lift system be two secondary lift systems for being symmetricly set on main hoist system two sides, each secondary lift system packet
Auxiliary dowel bar, auxiliary cables, auxiliary hook and plummet are included, is equipped on upper cover plate monosymmetric two with center preformed hole
Hawser through-hole, the two sides of Bower Anchor muscle bar are arranged in two auxiliary dowel bars, in the lower pallet and level-sensing device fixed plate
It symmetrically opens there are two auxiliary cables through-hole heart through-hole two sides；Two hawsers that the upper end of two auxiliary cables passes through upper cover plate are logical
Hole is connected by auxiliary hook with hoisting mechanism, and the lower end of two auxiliary cables is corresponding in turn to solid across lower pallet and level-sensing device
Two hawser through-holes on fixed board are arranged with lower end to be connected in plummet.
3. a kind of broken drop shaft level-sensing device in underground according to claim 1 is fixed and lifting device, it is characterised in that described
Lower pallet central through hole > level-sensing device fixed plate central through hole.
4. a kind of broken drop shaft level-sensing device in underground according to claim 2 is fixed and lifting device, it is characterised in that: spare
The plummet diameter of hawser lower end < lower pallet hawser through-hole diameter；Plummet diameter > level-sensing device fixed plate cable of back up cable lower end
Rope through-hole diameter.
5. a kind of broken drop shaft level-sensing device in underground according to claim 1 is fixed and lifting device, it is characterised in that described
Level-sensing device fixed plate be an and size matched round supporting plate concentric with branch pillar.
6. a kind of broken drop shaft level-sensing device in underground according to claim 1 is fixed and lifting device, it is characterised in that described
Main push-towing rope rope use wirerope, auxiliary cables use glass cord.
7. a kind of broken drop shaft level-sensing device in underground according to claim 1 is fixed and lifting device, it is characterised in that described
Hoisting mechanism be winch hoister or crane elevator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821758716.8U CN209317867U (en) | 2018-10-29 | 2018-10-29 | A kind of underground is crushed drop shaft level-sensing device and fixes and lifting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821758716.8U CN209317867U (en) | 2018-10-29 | 2018-10-29 | A kind of underground is crushed drop shaft level-sensing device and fixes and lifting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209317867U true CN209317867U (en) | 2019-08-30 |
Family
ID=67708758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821758716.8U Withdrawn - After Issue CN209317867U (en) | 2018-10-29 | 2018-10-29 | A kind of underground is crushed drop shaft level-sensing device and fixes and lifting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209317867U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109225592A (en) * | 2018-10-29 | 2019-01-18 | 中冶北方（大连）工程技术有限公司 | A kind of underground is crushed drop shaft level-sensing device and fixes and lifting device |
-
2018
- 2018-10-29 CN CN201821758716.8U patent/CN209317867U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109225592A (en) * | 2018-10-29 | 2019-01-18 | 中冶北方（大连）工程技术有限公司 | A kind of underground is crushed drop shaft level-sensing device and fixes and lifting device |
| CN109225592B (en) * | 2018-10-29 | 2023-10-27 | 中冶北方（大连）工程技术有限公司 | Underground broken drop shaft charge level indicator is fixed and hoisting device |
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Granted publication date: 20190830 Effective date of abandoning: 20231027 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190830 Effective date of abandoning: 20231027 |