CN102996146B - Early warning hydraulic prop device - Google Patents
Early warning hydraulic prop device Download PDFInfo
- Publication number
- CN102996146B CN102996146B CN201210582954.9A CN201210582954A CN102996146B CN 102996146 B CN102996146 B CN 102996146B CN 201210582954 A CN201210582954 A CN 201210582954A CN 102996146 B CN102996146 B CN 102996146B
- Authority
- CN
- China
- Prior art keywords
- cylinder
- flange
- hollow
- hydraulic
- early warning
- 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.)
- Expired - Fee Related
Links
Landscapes
- Fluid-Damping Devices (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
An early warning hydraulic prop device belongs to the technical field of hydraulic props. Is characterized in that: the hydraulic early warning device comprises a top cover assembly, a support column body, a mechanical chuck, a hollow hydraulic cylinder, a hydraulic spring chuck, a hollow base and an early warning liquid bag assembly. The lower part of top cap subassembly is connected with the pillar body upper end through the screw thread, the machinery chuck suit is on pillar body upper portion, its bottom flange is connected with hollow hydraulic cylinder's upper end flange through the bolt, hollow hydraulic cylinder's lower extreme flange is connected with hydraulic spring chuck upper end flange through the bolt, hydraulic spring chuck's lower extreme flange is connected with hollow base upper end flange through the bolt, the pillar body runs through in the cavity of above-mentioned each, the felting needle of early warning liquid bag subassembly passes through the mounting bracket to be installed on hollow hydraulic cylinder's outer wall, the smell bag passes through the mounting disc to be installed on hollow hydraulic cylinder upper end flange. The height is adjustable, the adaptability is strong; the friction force with the rock stratum is increased, and the safety is enhanced; and the hazard of accidents is reduced by adopting the early warning device.
Description
Technical field
The invention belongs to hydraulic prop technical field, be specifically related to a kind of early warning hydraulic prop device.
Background technology
At present, both at home and abroad in coal mining, mining and constructing tunnel, its work plane many employings hydraulic prop carries out supporting, mainly there is following shortcoming: 1. the hydraulic prop bearing height of prior art limits by hydraulic cylinder length, for coal mine roadway when bank height changes, need to adopt the hydraulic prop of differing heights to support, its poor universality; 2. after hydraulic system fault appears in the hydraulic prop of prior art, just enabling capabilities is lost, poor stability; 3. when pillar be subject to ore deposit top press time, without warning function, it is weak that worker safety protects emergency capability; 4. when high-impact is pressed, prior art triple-use valve vent flow is limited, hydraulic system can be caused to damage, poor stability; 5. prior art does not design stud overcap and footing rubbing surface for top, rock stratum, tunnel and bottom complicated shape, easily topples over accident, poor stability; 6. prior art not in the mining active process of tunnel rock stratum vibration and digging shock effect, easily make hydraulic cylinder piston vibration heating cause in let out, the hydraulic system life-span is shorter.
Summary of the invention
The object of the invention is to provide a kind of early warning hydraulic prop device, effectively can overcome the shortcoming that prior art exists.
The present invention is achieved in that its architectural feature as shown in Figure 1, and it includes cap assembly I, Body of pillar II, mechanical chuck III, hollow hydraulic cylinder IV, liquid spring chuck V, hollow base VI and early warning liquid capsule assembly VII.The bottom of cap assembly I is connected with Body of pillar II upper end by screw thread, mechanical chuck III is sleeved on Body of pillar II top, its bottom flange is connected by the upper flanges of bolt with hollow hydraulic cylinder IV, the lower end flanges of hollow hydraulic cylinder IV is connected with liquid spring chuck V upper flanges by bolt, the lower end flanges of liquid spring chuck V is connected with hollow base VI upper flanges by bolt, Body of pillar II is applied in the cavity of above-mentioned each, the pricker of early warning liquid capsule assembly VII is arranged on by installing rack on the outer wall of hollow hydraulic cylinder IV, smell capsule is arranged in hollow hydraulic cylinder IV upper flanges by mounting disc.
Described cap assembly I is as shown in Fig. 2,3,4,5, top cover base 1 upper surface is plate-like, tray bottom is equipped with damping layer 2 successively with fractals layer 3 and is connected with top cover base 1 by screw 5, top cover base 1 upper surface is equipped with rubber anti-dumping thorn 4, top cover base 1 upper end perisporium is shaped with multiple wedge hole 6 and is connected with wedge draw ring 7.The bottom of top cover base 1 is stair-stepping cylinder, and cylinder bottom center is shaped with circular hole 10, and circular hole 10 bottom is shaped with screwed hole 8; Handle 9 is connected on the cylindrical outer wall of top cover base 1; The structure of wedge draw ring 7 is that wedge oral pillar body 11 is fixed together by chock 14 and wedge hole 6, and draw ring 12 is linked together by cottor pin 13 and wedge oral pillar body 11.Described damping layer 2 is according to formation geology oscillatory type, chooses that corresponding copper-zinc-aluminium system or iron-chromium-molybdenum system or manganese-copper series alloy manufacture; Described fractals layer 3 is according to strata structure shape, after opening up out rock layer surface planform, adopts high strength, wear-resistant metal manufacture with gypsum mould.
The structure of described Body of pillar II is Fig. 6, shown in 7,8,9,10, the upper half is together by a threaded connection by multiple cone 15, lower half is together by a threaded connection by multiple micro-cone 16, and upper and lower half is integral by threaded connection, and the cone angle of micro-cone 16 is 1 ° ~ 7 °.
The two pawl self-centering universal chucks that what the structure of described mechanical chuck III adopted is with through hole in jig, the tapering of claw clamping face is according to the taper design of cone 15 in Body of pillar II.
The structure of described hollow hydraulic cylinder IV as shown in figure 11, the screw that piston 22 upper end of hollow is laid by circumference above it is connected with flange 20, lower end is arranged in the annular cavity type that formed by inner cylinder tube 25 and cylinder body 23, cylinder cap 21 and cylinder body 23 are connected by screw, and the screw that bottom and the flange in the bottom 26 of cylinder body 23 are laid by circumference is connected.The periphery of piston 22 is set with drainage spring 28; Cylinder body 23 bottom outer wall is provided with triple-use valve 27 be communicated with hydraulic cavities H in cylinder body 23, the middle part outside wall surface of cylinder body 23 is provided with pressure sensor Displaying Meter 24.
The structure of described liquid spring chuck V is as shown in Figure 12,13,14,15,16, the upper cover flange 29 that a middle part is made for sleeve pipe in the middle of it, the screw laid by circumferential above it is connected with the interior sleeve 30 being shaped with round platform, the bottom of sleeve 30 is connected with base flange plate 41 by the screw of circumference, between the casing wall and sleeve 30 of upper cover flange 29, piston 31 is installed, cylinder bottom 32 by ring set between piston 31 and sleeve 30.The bottom of piston 31 is overlapped 35 by trapezoidal thread connection 34 with ring compression and is connected.The bottom of ring compression cover 35 is connected with gripper jaw 37 by the screw 36 of circumference, gap is left between ring compression cover 35 and gripper jaw 37, below gripper jaw 37 upper flange, clamping sleeve 38 is installed, disk spring 42 is installed between clamping sleeve 38 bottom surface and taper hole seat 40, on taper hole seat 40, butterfly spring 42 is provided with thin-walled Taper Pipe 39 in hole, taper hole seat 40 is arranged on above base flange plate 41, sap cavity E on being formed in cylinder body on piston 31, the lower sap cavity F of the piston 31 interior formation of cylinder body below, sleeve 30 wall offers the clamping inlet opening 45 that is communicated with upper sap cavity E and be communicated with lower sap cavity F unclamp inlet opening 44, sleeve wall below cylinder bottom 32 offers air vent 43.
The structure of described hollow base VI as shown in figure 17, be connected with fractals layer 52 with damping layer 51 successively below by screw 53 at base flange plate 50, base flange plate 50 is separately installed with left and right handle 49,49 ＇ above, in base flange upper end, pressure sensor 48 is housed.
The structure of described early warning liquid capsule assembly VII is as shown in Figure 18,19,20,21: the mounting disc 54 of up-small and down-big stairstepping circular hole is made at semi-disc center, be bolted 59 to be connected with the flange 20 of hollow hydraulic cylinder IV, in stairstepping circular hole, be provided with urgent odor liquids capsule 55, odor liquids capsule 56 and aluminium foil shell 57 from top to down successively, stairstepping circular hole lower end is fixed by annular assembling circle 58 internal thread.Pricker 61 is arranged on the distance of the lower direction setting of mounting disc 54, and the pricker 61 being shaped with axial groove is arranged on the outer wall of cylinder body 23 by mount pad 60.
As shown in figure 22, triple-use valve 27 includes feather valve 62, one way valve 63, safety valve 64 to the principle of described triple-use valve 27, connects and connects with hydraulic pressure intracavity liquid on the outer wall of hollow hydraulic cylinder IV.
The present invention compared with prior art has the following advantages and effect:
1. owing to using mechanical chuck III and liquid spring chuck V clamp posts body II, breach the limitation of conventional hydraulic shore supports height by the restriction of hydraulic cylinder length, by combining the length of the cone be threaded, Body of pillar better can adapt to the change of mine height, and applicability is strong.
2. because Body of pillar II is made up of the multiple micro-cone of the multiple cone in top and bottom, when pressing at the beginning of rock top, liquid spring chuck V only prevents Body of pillar eccentric, when reaching certain stroke, liquid spring chuck V and micro-cone form friction prop effect, when there is hydraulic system fault, as hydraulic cylinder detonation or valve body break down time, hydraulic prop loses enabling capabilities, liquid spring chuck and micro-cone form friction prop still can provide support power, achieve the function of dual computer fault-tolerant, safety is higher.
3. in order to prevent dead post, adopt mechanical chuck III and liquid spring chuck V mechanism, if there is dead post, dismantle mechanical chuck III by spanner or by liquid from unclamping inlet fluid injection, make liquid spring chuck V return gripper jaw, simple.
4. by have employed damping layer structure in cap assembly I and hollow base VI, the energy of the shock and vibration caused in rock stratum and mining process can be absorbed, effectively can improve hydraulic system application life, overcome in prior art the deficiency of the damping vibration attenuation function depending on hydraulic cylinder piston, improve in prior art, cylinder piston vibration causes sealing heating, easily produces leakage, causes the application life of hydraulic prop short, the shortcoming of poor stability.
5. the present invention is owing to adopting fractals tribology principles, and by adopting fractals layer in cap assembly I and hollow base VI, can increase the frictional force of hydraulic prop top cover, base and rock stratum, prevent hydraulic prop from toppling over the generation of accident, safety is higher.
6. the present invention is owing to adopting liquid capsule smell alarm technique, and when there is uncertain danger, as situations such as earthquakes, Field Force's very first time, by smell early warning, can be met an urgent need fast and flee from, and reduces life security accident.
7. the present invention is under heavy duty and large impact, can reasonable combination multi-layer hydraulic cylinder, realizes multiple safety overflow valve overflow, increases spillway discharge, effectively reduces single hydraulic cylinder little due to excess flow, causes and suppress cylinder, damage hydraulic cylinder; For increasing stability also multi-section mechanical grip chuck capable of being combined and liquid spring chuck; Improve early warning Combined hydraulic pillar air.
8. the present invention is in hollow base, is provided with intrinsic safety type pressure sensor and realizes secondary warning and verification smell capsule warning validity, use existing network Remote Monitoring Technology, can improve hydraulic prop support system overall security.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is cap assembly structural representation;
Fig. 3 is A-A cross-sectional schematic in Fig. 2;
Fig. 4 is K portion enlarged drawing in Fig. 3;
Fig. 5 is the top view of Fig. 2;
Fig. 6 is Body of pillar structural representation;
Fig. 7 is cone elevation;
Fig. 8 is the top view of Fig. 7;
Fig. 9 is micro-cone elevation;
Figure 10 is the top view of Fig. 9;
Figure 11 is hollow hydraulic cylinder structure schematic diagram;
Figure 12 is liquid spring chuck structure schematic diagram;
Figure 13 is thin-walled Taper Pipe elevation;
Figure 14 is the top view of Figure 13;
Figure 15 is gripper jaw sectional view;
Figure 16 is the top view of Figure 15;
Figure 17 is hollow base structural representation;
Figure 18 is early warning liquid capsule assembly schematic diagram;
Figure 19 is mounting disc structure cross-sectional schematic;
Figure 20 is the schematic top plan view of Figure 19;
Figure 21 is the top view of pricker;
Figure 22 is triple-use valve circuit system schematic diagram;
In figure: I-cap assembly, II-Body of pillar, III-mechanical chuck, IV-hollow hydraulic cylinder, V-liquid spring chuck, VI-hollow base, VII-early warning liquid capsule assembly;
1-top cover base, 2-damping layer, 3-fractals layer, 4-rubber anti-dumping is stung, 5-screw, 6-wedge hole, 7-wedge draw ring, 8-screwed hole, 9-handle, 10-circular hole, 11-wedge oral pillar body, 12-draw ring, 13-cottor pin, 14-chock, 15-cone, 16-micro-cone, 20-flange, 21-cylinder cap, 22-piston, 23-cylinder body, 24-Displaying Meter, 25-inner cylinder tube, 26-flange in the bottom, 27-triple-use valve, 28-spring, 29-upper cover flange, 30-sleeve, 31-piston, 32-cylinder bottom, 33-screw, 34-trapezoidal thread connects, 35-ring compression cover, 36-screw, 37-gripper jaw, 38-clamping sleeve, 39-thin-walled Taper Pipe, 40-taper hole seat, 41-base flange plate, 42-butterfly spring, 43-air vent, 44-unclamps inlet, 45-clamps inlet, 47-flange, 48-pressure sensor, 49, 49 ＇-handle, 50-base flange plate, 51-damping layer, 52-fractals layer, 53-screw, 54-mounting disc, the urgent odor liquids capsule of 55-, 56-odor liquids capsule, 57-aluminium foil shell, 58-annular assembling circle, 59-bolt, 60-mount pad, 61-pricker, 62-feather valve, 63-one way valve, 64-safety valve, 65-fluid injection gun, K
1-above crack, K
2-under crack, K
3-crack, H-hydraulic cavities, the upper hydraulic cavities of E-, F-lower hydraulic pressure chamber.
Detailed description of the invention
The present invention is elaborated by preferred embodiment below in conjunction with accompanying drawing.
As shown in Figure 1, device fortune of the present invention is contained in tunnel, meets according to rock stratum situation choosing dress the damping layer that triangle is the inclined-plane of 3%-4%, adapt to the situation of inclination of strata;
As shown in Figure 6, according to tunnel actual support height, the length of Fastening Column body II, clamps leading screw by using torque spanner fastening machines chuck III and makes mechanical chuck gripper jaw clamp tight cone 15;
As shown in figure 12, by hydraulic pump to the fluid injection of clamping inlet 45, unclamp inlet 44 times liquid, make liquid spring chuck gripper jaw 37 gentle touchdown to micro-cone 16, realize mechanical chuck III and liquid spring chuck V self-centering control;
As shown in Fig. 1,22, inserted in triple-use valve 27 liquid injection hole by general fluid injection gun 65, open fluid injection gun 65, one way valve 63 steel ball is pushed open by highly pressurised liquid, enters in hydraulic cavities H and piston 22 is raised; After the fractals layer 3 of cap assembly I is close to work plane, fluid injection gun 65 shut-down operation, at this moment hydraulic cavities H pressure is pump station pressure, and cap assembly I obtains setting load; According to setting prop height, re-use hydraulic pump by clamping inlet 45 fluid injection, unclamp inlet 44 fluid, make liquid spring chuck gripper jaw 37 inwardly micro-enter, the micro-cone 16 preset in Body of pillar II moves down the stroke of locking with liquid spring chuck V; After micro-cone 16 in Body of pillar II is moved downwardly over preset strokes, realize the safeguard protection of friction support;
As Figure 18,19,20,21 installs early warning liquid capsule assembly VII, by screw mechanism nut adjustment pricker 61 height, make pricker 61 contact aluminium foil shell 57 surface, clamp nut makes its self-locking, realizes the Installation and Debugging of on-the-spot liquid capsule early warning system;
As Figure 11,17 installs general intrinsic safety type pressure sensor Displaying Meter 24 on hydraulic cylinder IV outer wall, and link with intrinsic safety type pressure sensor 48, debugging display unit display pressure indicating value, arranges pressure alarm limit, start alarm buzzer, realize pressure sensor and detect;
As shown in Figure 3,4, adopt wedge draw ring 7 to realize being connected by the Fast Installation such as net, rope with adjacent columns, prevent single early warning hydraulic prop device from toppling over accident;
Along with coal-face propelling and install the prolongation of time, work plane reaction load-carrying in early warning hydraulic prop device increases, when cap assembly pressure exceedes early warning hydraulic prop device rated service loads, safety valve 64 in triple-use valve 27 is opened by the highly pressurised liquid in the hydraulic cavities H of early warning hydraulic prop device, liquid spill, contract under early warning hydraulic prop device, inner chamber H pressure reduces, early warning hydraulic prop device bearing load reduces, safety valve 64 cuts out, inner chamber H liquid stops excessive, therefore, early warning hydraulic prop device remains specified service load, form fast constant-resistance type pillar,
As shown in figure 12, when hydraulic system breaks down, after Body of pillar II is moved downwardly over preset strokes, micro-cone 16 in Body of pillar II is formed with liquid spring chuck jaws 37 and rubs, if micro-cone 16 continues to decline, claw 37 moves down by frictional force, by taper hole seat 40 effect, claw 37 is inwardly stepped up, if micro-cone 16 falls further, claw 37 drives clamping sleeve 38 to move downward extruding butterfly spring 42, butterfly spring 42 stress deformation extruding thin-walled Taper Pipe 39, to internal strain, makes claw 37 act on by taper hole seat 40 and inwardly steps up further; And then it is more to realize micro-cone 16 glide downwards, gripper jaw 37 chucking power is larger, forms passive locking friction support force intensity larger, realizes the safeguard protection of friction support;
During prop drawing, closing presure sensor 48, removal sensor Displaying Meter 24; Dismounting early warning liquid capsule assembly VII.Inlet 44 fluid injection is unclamped by hydraulic pump, clamping inlet 45 fluid, opens the gripper jaw 37 of liquid spring chuck V, opens the feather valve 62 in triple-use valve, liquid in early warning hydraulic prop device is discharged through feather valve 62, and hydraulic cylinder automatically resets under spring 28 and feather valve 62 act on.
Obviously; those skilled in the art can change it and be out of shape; if these are changed and distortion does not depart from principle of the present invention, belong to the scope of claim of the present invention and equivalent technologies thereof, then protection scope of the present invention comprises these changes and distortion.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210582954.9A CN102996146B (en) | 2012-12-28 | 2012-12-28 | Early warning hydraulic prop device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210582954.9A CN102996146B (en) | 2012-12-28 | 2012-12-28 | Early warning hydraulic prop device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102996146A CN102996146A (en) | 2013-03-27 |
| CN102996146B true CN102996146B (en) | 2016-03-30 |
Family
ID=47925191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210582954.9A Expired - Fee Related CN102996146B (en) | 2012-12-28 | 2012-12-28 | Early warning hydraulic prop device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102996146B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104074532A (en) * | 2014-07-07 | 2014-10-01 | 徐州中安机械制造有限公司 | Intelligent single-body hydraulic prop |
| CN104775835B (en) * | 2015-01-26 | 2016-08-24 | 中国矿业大学 | A kind of self-regulation magnetic flow liquid individual prop |
| CN107255037A (en) * | 2017-06-21 | 2017-10-17 | 徐州中安科技股份有限公司 | Pressure sensing device of hydraulic prop |
| CN112304494B (en) * | 2019-07-25 | 2024-07-16 | 北京康斯特仪表科技股份有限公司 | Gas circuit subassembly and gas pressure check gauge |
| CN110593920B (en) * | 2019-10-08 | 2020-11-24 | 河南工程学院 | A temporary anti-collision support device capable of absorbing blasting vibration energy in tunneling |
| CN110645030A (en) * | 2019-11-20 | 2020-01-03 | 象山冰川智能装备有限公司 | Bracing piece of prevention roof accident |
| CN111365045A (en) * | 2020-03-30 | 2020-07-03 | 中铁隧道集团二处有限公司 | Rapid safety protection device after tunnel excavation and construction and protection method thereof |
| CN111852070A (en) * | 2020-08-03 | 2020-10-30 | 西安科技大学 | Support and reinforcement structure and support and reinforcement method for irregular roof of ancient caves |
| CN114427477A (en) * | 2022-01-04 | 2022-05-03 | 淮北矿业股份有限公司 | A hydraulic strut with advanced support for easy adjustment of pressure |
| CN117927278B (en) * | 2024-03-22 | 2024-06-04 | 山东科技大学 | Constant resistance control monitoring device, method and construction method for steel tube concrete pier column |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB742701A (en) * | 1950-05-10 | 1956-01-04 | Schmidt Alexander | Improvements in or relating to telescopic pitprops |
| GB975178A (en) * | 1962-03-02 | 1964-11-11 | Wild A G & Co Ltd | Improvements in or relating to composite mine roof supports |
| US5967702A (en) * | 1996-08-08 | 1999-10-19 | Vogelzang; Harmen Reinaldus | Quick-release pit prop |
| CN2700561Y (en) * | 2004-05-02 | 2005-05-18 | 中国矿业大学 | Temporary supporter for mine tunnel |
| CN201050375Y (en) * | 2007-05-30 | 2008-04-23 | 高占龙 | Alarming support for coal mine |
| CN102230386A (en) * | 2011-05-25 | 2011-11-02 | 朱惠芬 | Combined hydraulic strut cap |
| CN203161262U (en) * | 2012-12-28 | 2013-08-28 | 太原科技大学 | Early warning hydraulic prop device |
-
2012
- 2012-12-28 CN CN201210582954.9A patent/CN102996146B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB742701A (en) * | 1950-05-10 | 1956-01-04 | Schmidt Alexander | Improvements in or relating to telescopic pitprops |
| GB975178A (en) * | 1962-03-02 | 1964-11-11 | Wild A G & Co Ltd | Improvements in or relating to composite mine roof supports |
| US5967702A (en) * | 1996-08-08 | 1999-10-19 | Vogelzang; Harmen Reinaldus | Quick-release pit prop |
| CN2700561Y (en) * | 2004-05-02 | 2005-05-18 | 中国矿业大学 | Temporary supporter for mine tunnel |
| CN201050375Y (en) * | 2007-05-30 | 2008-04-23 | 高占龙 | Alarming support for coal mine |
| CN102230386A (en) * | 2011-05-25 | 2011-11-02 | 朱惠芬 | Combined hydraulic strut cap |
| CN203161262U (en) * | 2012-12-28 | 2013-08-28 | 太原科技大学 | Early warning hydraulic prop device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102996146A (en) | 2013-03-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102996146B (en) | Early warning hydraulic prop device | |
| CN107989569B (en) | Coiled tubing dynamic seal device | |
| CN203161262U (en) | Early warning hydraulic prop device | |
| CN207051170U (en) | It is a kind of to test the experimental rig for meeting water softening Rock Anchor anchoring mechanical property | |
| CN210370560U (en) | Multipurpose packer feeding tool | |
| CN103016898A (en) | Rubber ball sealer embedded with butterfly plate | |
| CN113482560B (en) | Novel double-valve type continuous circulating valve with clamping device | |
| CN201573171U (en) | Piston remover for ZL50F type loader pincer type brake-shoe | |
| CN110735609B (en) | Application method of device for petroleum industry | |
| CN100535394C (en) | Suspension type hydraulic prop | |
| CN104929668B (en) | Anchor cable dismounting joint and anchor cable method for dismounting | |
| CN108214821B (en) | Concrete pole bottom pressure casting molding equipment and process | |
| CN202731809U (en) | Multifunctional well-sealing anti-theft well head | |
| CN215213792U (en) | Low-melting-point alloy pressure injection device | |
| CN110578483B (en) | Grouting circulation assembly suitable for traveling block hook drilling machine and using method thereof | |
| CN202659184U (en) | Reliable releasing device | |
| CN204036374U (en) | Conveying cylinder of concrete pump piston head withdrawing device | |
| CN209782007U (en) | Wind tunnel pipe end cover | |
| CN106965308A (en) | A kind of stripper apparatus of concrete section of jurisdiction built-in slip casting pipe | |
| CN202596636U (en) | High-temperature hydraulic bumper jar | |
| CN204873382U (en) | Four lamella structure friction pulleys of lifting machine of restricting more | |
| CN222405477U (en) | Flange separation tool | |
| CN206448787U (en) | Multifunction drilling tool release device | |
| CN206360715U (en) | Filled hollow hydraulic prop device | |
| CN205870411U (en) | A instrument for dismantling draw gear of bogie central authorities |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160330 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |