CN107324237A - Field bridge cart jacking cylinder mechanical anti-falling device - Google Patents
Field bridge cart jacking cylinder mechanical anti-falling device Download PDFInfo
- Publication number
- CN107324237A CN107324237A CN201710608166.5A CN201710608166A CN107324237A CN 107324237 A CN107324237 A CN 107324237A CN 201710608166 A CN201710608166 A CN 201710608166A CN 107324237 A CN107324237 A CN 107324237A
- Authority
- CN
- China
- Prior art keywords
- lock sleeve
- jacking cylinder
- piston rod
- cambered surface
- circular cambered
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
- B66F3/30—Constructional features with positive brakes or locks
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Actuator (AREA)
Abstract
The invention discloses field bridge cart jacking cylinder mechanical anti-falling device, including regulation lock sleeve, piston rod concaved circular cambered surface boss set, the regulation lock sleeve is fixed on jacking cylinder body lower end outer wall by adjusting lock sleeve tight fixed bolt, regulation lock sleeve bolt is provided with the regulation lock sleeve outer wall, it is provided with below the regulation lock sleeve on spring base, the spring base and is provided with spring pin.Beneficial effect is：1st, mechanical anti-falling device design is simple, simple installation, non-maintaining；2nd, reliability is high, eliminates the potential safety hazard for occurring scratching accident, improves operating efficiency；3rd, the start-stop of generator set number of times for gliding by ball seat, falling and producing is greatly decreased, fuel consumption is reduced；4th, the materials such as magnetic cylinder, cylinder seal and repair demolition are saved, replacement cost is installed；5th, the application of mechanical anti-falling device, once put into it is lifelong be benefited, be that similar structures, the hydraulic jack of installation form add a solution again.
Description
Technical field
The present invention relates to cargo handling equipment technical field, more particularly to field bridge cart jacking cylinder mechanical type anti-fall
Device.
Background technology
Harbour tyred container door type crane (calling a bridge in the following text) is big because of lifting capacity, and itself weight is also big, to ensure a bridge
Cross the street transition steering situation (0 ° goes to 90 ° or 90 ° and goes to 0 °) response timely, reduce cart tire and turn to frictional resistance, every
Bridge, which is respectively provided with, is provided with hydraulic power unit and four jacking cylinders, transfers, and four jacking cylinders are placed in field by diagonal
Below portal frame saddle beam and four door leg connecting portions.When bridge needs the transition to turn to, driver manipulates cart pole changer in drivers' cab,
Hydraulic power pumping plant is sent to jacking cylinder rodless cavity by program there is provided pressure oil, and jacking piston rod is descending until by whole field bridge
Jack-up, 8 cart tires are completely disengaged from behind ground, the action of steering cylinder piston rod, promote cart tire without any resistance feelings
Under condition, tire is gone to 90 ° or 90 ° from 0 ° and goes to 0 °.After the completion of steering, steering cylinder stops, and pressure oil is sent to jacking cylinder
Rod chamber, jacking piston rod is up, and 8 tires transfer to ground, completes steering procedure, it is to avoid tire friction and complicated bent turn round are damaged
Wound, extends the service life of tire.During the bridge normal operation of field, to make the piston rod and connection ball seat of vertically arranged jacking cylinder
All the time collapsed state is in, design of Hydraulic System has self-compensating pressure function, and the internal such as valve element of compensation, sealing component are consolidated
The slow leakage of system inner high voltage oil for having characteristic and causing, to ensure that piston rod and ball seat will not drop in operation.
Field bridge oil changes after electricity, it is contemplated that input cost, the inverter capacity of selection is smaller, when field bridge is with civil power operation, just
It can not be powered to hydraulic jacking system, the slow leakage of hydraulic system inner high voltage oil, pressure cannot be compensated in time, and piston rod
And the combined influence such as ball seat deadweight, the downslide of piston rod and ball seat, fall failure often occur.For the above-mentioned downslide of solution, event of falling
Barrier, magnetic cylinder is installed using in jacking cylinder piston rod head.After jacking piston rod is up to be shunk in place, magnetic cylinder absorption jacking oil
Cylinder barrel end cap, compensation hydraulic is substituted with magnetic cylinder magnetic-adsorption, prevents piston rod and ball seat from dropping.
Elapsed with use time, the anti-fall deficiency of magnetic force also progressively shows, and adsorption capacity declines, and magnetic cylinder is easily rupturable, buying
Monovalent high, reliability is low, and downslide, fall failure are more, and the ball seat fallen and the accident of field bridge runway scratching also happen occasionally.For
This, can only frequent starting bridge diesel generating set powered to hydraulic power station, compensate pressure using hydraulic system, pack up jacking
After piston rod, stop generating set again, switch back into civil power operation.This measure not only time-consuming excessive fuel consumption, influences operating efficiency, also increases
Repair personnel's work on duty.
The content of the invention
The purpose of the present invention is that provides a bridge cart jacking cylinder mechanical type anti-fall to solve the above problems
Device.
The present invention is achieved through the following technical solutions above-mentioned purpose：
Field bridge cart jacking cylinder mechanical anti-falling device, including regulation lock sleeve, piston rod concaved circular cambered surface boss set, institute
State regulation lock sleeve to be fixed on jacking cylinder body lower end outer wall by adjusting lock sleeve tight fixed bolt, outside the regulation lock sleeve
It is provided with to be provided with spring base, the spring base below regulation lock sleeve bolt, the regulation lock sleeve on wall and sets
Have and be provided with steel ball at the top of spring pin, the spring pin, the spring pin afterbody is provided with flexible adjustment handle, described
Grease nipple is provided with flexible adjustment handle outer face, the spring base inner surface setting has adjusting nut in spring base, described
Spring base outer surface is provided with the outer adjusting nut of spring base, and the piston rod concaved circular cambered surface boss set passes through piston rod concaved circular cambered surface
Boss set tightening is bolted to outside ball rod tightening round nut, is provided with the piston rod concaved circular cambered surface boss set outer wall
Piston rod concaved circular cambered surface boss covers bolt.
In the present embodiment, the regulation lock sleeve, piston rod concaved circular cambered surface boss set are with Harvard formula structure design
Make.
In the present embodiment, the regulation lock sleeve dimidiation is nested in outside the jacking cylinder body, the regulation lock
The internal diameter size tightly covered is identical with the outside dimension of the jacking cylinder body.
In the present embodiment, each junction of the regulation lock sleeve is at least provided with two regulation lock sleeve tightenings
Bolt.
In the present embodiment, it is symmetrically welded with two spring bases, the spring base and adjusts on the regulation lock sleeve
Nut and the outer adjusting nut of the spring base are respectively nested in inside and outside the spring base, and the spring pin passes through screw thread
Nut interior is adjusted outside adjusting nut in the spring base and the spring base.
In the present embodiment, the flexible adjustment handle is by being threadably mounted on the spring pin, the steel ball buckle
Inside the spring pin, the spring pin, which is internally provided with, to be held out against between the steel ball and the flexible adjustment handle
Stage clip.
In the present embodiment, the piston rod concaved circular cambered surface boss set dimidiation is nested in the ball rod tightening round nut
Outside, the piston rod concaved circular cambered surface boss set outer face center forms the circular groove that a circle caves inward, the steel
Top dome portion is buckled in groove.
In the present embodiment, each junction of the piston rod concaved circular cambered surface boss set is at least provided with two pistons
Bar concaved circular cambered surface boss covers tight fixed bolt.
The beneficial effects of the present invention are：1st, mechanical anti-falling device design is simple, simple installation, non-maintaining；2nd, reliability
Height, eliminates the potential safety hazard for occurring scratching accident, improves operating efficiency；3rd, it is greatly decreased and is produced because ball seat glides, fallen
Start-stop of generator set number of times, reduce fuel consumption；4th, the materials such as magnetic cylinder, cylinder seal and repair demolition are saved, is installed more
Change this into；5th, the application of mechanical anti-falling device, once put into it is lifelong be benefited, be similar structures, installation form hydraulic jack again
Add a solution.
Brief description of the drawings
Fig. 1 is the scheme of installation of field bridge cart jacking cylinder mechanical anti-falling device of the present invention；
Fig. 2 is the anti-fall fixing part structure enlarged drawing of field bridge cart jacking cylinder mechanical anti-falling device of the present invention；
Fig. 3 is the regulation locking sleeve structure sketch of field bridge cart jacking cylinder mechanical anti-falling device of the present invention；
Fig. 4 is the piston rod concaved circular cambered surface boss noose of field bridge cart jacking cylinder mechanical anti-falling device of the present invention
Structure sketch.
Description of reference numerals is as follows：
1st, jacking cylinder body；2nd, ball rod tightening round nut；3rd, lock sleeve is adjusted；4th, piston rod concaved circular cambered surface boss set；
5th, flexible adjustment handle；6th, spring pin；7th, steel ball；8th, grease nipple；9th, lock sleeve tight fixed bolt is adjusted；10th, lock sleeve is adjusted
Bolt；11st, adjusting nut in spring base；12nd, the outer adjusting nut of spring base；13rd, piston rod concaved circular cambered surface boss set tightening
Bolt；14th, piston rod concaved circular cambered surface boss set bolt；15th, spring base.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings：
As Figure 1-Figure 4, field bridge cart jacking cylinder mechanical anti-falling device, including the regulation lock sleeve 3, described
Piston rod concaved circular cambered surface boss set 4, the regulation lock sleeve 3 is fixed on the top by the regulation lock sleeve tight fixed bolt 9
On the lower end outer wall of oil-lifting jar body 1, the regulation lock sleeve bolt 10 is provided with the regulation outer wall of lock sleeve 3, it is described
Regulation lock sleeve bolt 10 is used for fixing the regulation lock sleeve 3, and the lower section of regulation lock sleeve 3 is provided with the spring
The spring pin 6 is provided with seat 15, the spring base 15, the top of spring pin 6 is provided with the steel ball 7, described
Steel ball 7, which is used for being buckled in the groove of the piston rod concaved circular cambered surface boss set 4, prevents falling phenomenon, the spring pin
6 afterbodys are provided with the flexible adjustment handle 5, and the flexible adjustment handle 5 is used for adjusting the elastic force of stage clip, the elasticity
The grease nipple 8 is provided with the outer face of regulation handle 5, the inner surface setting of spring base 15 has regulation spiral shell in the spring base
Mother 11, the outer surface of spring base 15 is provided with the outer adjusting nut 12 of the spring base, the piston rod concaved circular cambered surface boss set 4
Tight fixed bolt 13 is covered by the piston rod concaved circular cambered surface boss to be fixed on outside the ball rod tightening round nut 2, the work
Stopper rod concaved circular cambered surface boss, which covers, is provided with the piston rod concaved circular cambered surface boss set bolt 14, the piston rod on 4 outer walls
Concaved circular cambered surface boss set bolt 14 is used for fixing the piston rod concaved circular cambered surface boss set 4.
In the present embodiment, the regulation lock sleeve 3, piston rod concaved circular cambered surface boss set 4 are set with Harvard formula structure
Meter makes.
In the present embodiment, the regulation dimidiation of lock sleeve 3 is nested in outside the jacking cylinder body 1, the regulation
The internal diameter size of lock sleeve 3 is identical with the outside dimension of the jacking cylinder body 1.
In the present embodiment, each junction of the regulation lock sleeve 3 is locked at least provided with two regulation lockings
Determine bolt 9.
In the present embodiment, it is symmetrically welded with two spring bases 15, the spring base and adjusts on the regulation lock sleeve 3
Section nut 11 and the outer adjusting nut 12 of the spring base are respectively nested in inside and outside the spring base 15, the spring pin
6 by being threadably mounted in the spring base outside adjusting nut 11 and the spring base inside adjusting nut 12.
In the present embodiment, the flexible adjustment handle 5 is by being threadably mounted on the spring pin 6, and the steel ball 7 blocks
It is buckled in inside the spring pin 6, the spring pin 6, which is internally provided with, to be held out against in the steel ball 7 and the flexible adjustment hand
Stage clip between handle 5.
In the present embodiment, the piston rod concaved circular cambered surface boss covers 4 dimidiations and is nested in the ball rod tightening circle spiral shell
Outside mother 2, the piston rod concaved circular cambered surface boss covers 4 outer face centers and forms the circular groove that a circle caves inward, institute
The top of steel ball 7 is stated to be buckled in groove.
In the present embodiment, each junction of the piston rod concaved circular cambered surface boss set 4 is at least provided with two work
Stopper rod concaved circular cambered surface boss covers tight fixed bolt 13.
The present invention concrete operating principle be：In view of the deadweight of the parts such as jacking cylinder piston rod and ball seat, and field bridge
The vibrations existed during operation, it is desirable to：The regulation lock sleeve 3 controls the spring stack by the flexible adjustment handle 5 regulation
Pin 6 promotes the compressing steel ball 7 to cover 4 concaved circular cambered surfaces with the piston rod concaved circular cambered surface boss and contacted, and forces the steel ball 7 to press
Covered in the piston rod concaved circular cambered surface boss in 4 concaved circular cambered surfaces, keep contact to be not less than 450kg, axial force is less than top
Oil-lifting jar piston rod jacking force, the jacking of jacking cylinder, shrink work can be normal, jacking, shrink spacing in place with it is intrinsic
Spacing is consistent, and when jacking cylinder rodless cavity leads to hydraulic oil, piston rod is descending when doing jacking action, the piston rod concave arc
Face boss set 4 is descending with piston rod, and hydraulic thrust overcomes the elastic force of the spring pin 6 on the regulation lock sleeve 3, makes
The concaved circular cambered surface of the piston rod concaved circular cambered surface boss set 4 is skidded off from the steel ball 7, and piston rod is continued traveling downwardly field bridge top
Rise, when jacking cylinder rod chamber leads to hydraulic oil, piston rod shrinks up, and the piston rod concaved circular cambered surface boss set 4 is with piston rod
It is up together, until the concaved circular cambered surface that the piston rod concaved circular cambered surface boss covers 4 is fitted with the steel ball 7, in the spring stack
Under the elastic force contention effect of pin 6, the steel ball 7 being close to and the direction that moved vertically above and below piston rod add a horizontal direction
Axial force, when axial force is more than the deadweight such as piston rod and ball seat, you can the locking piston rod concaved circular cambered surface boss set 4 causes
Piston rod does not fall.
The basic principles, principal features and advantages of the present invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, the original for simply illustrating the present invention described in above-described embodiment and specification
Reason, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its Xiao Wu circle
It is fixed.
Claims (8)
1. a bridge cart jacking cylinder mechanical anti-falling device, it is characterised in that：Including regulation lock sleeve, piston rod concaved circular cambered surface
Boss set, the regulation lock sleeve is fixed on jacking cylinder body lower end outer wall by adjusting lock sleeve tight fixed bolt, described to adjust
It is provided with section lock sleeve outer wall below regulation lock sleeve bolt, the regulation lock sleeve and is provided with spring base, the bullet
It is provided with spring abutment at the top of spring pin, the spring pin and is provided with steel ball, the spring pin afterbody sets flexible adjust
Save and grease nipple is provided with handle, the flexible adjustment handle outer face, the spring base inner surface setting has tune in spring base
Nut is saved, the spring base outer surface is provided with the outer adjusting nut of spring base, and the piston rod concaved circular cambered surface boss set is by living
The set tightening of stopper rod concaved circular cambered surface boss is bolted to outside ball rod tightening round nut, the piston rod concaved circular cambered surface boss set
Piston rod concaved circular cambered surface boss set bolt is provided with outer wall.
2. according to claim 1 bridge cart jacking cylinder mechanical anti-falling device, it is characterised in that：The regulation lock
Tight set, piston rod concaved circular cambered surface boss set are made with Harvard formula structure design.
3. according to claim 1 bridge cart jacking cylinder mechanical anti-falling device, it is characterised in that：The regulation lock
Tight set dimidiation is nested in outside the jacking cylinder body, the internal diameter size and the jacking cylinder body of the regulation lock sleeve
Outside dimension it is identical.
4. the field bridge cart jacking cylinder mechanical anti-falling device according to claim 1 or 3, it is characterised in that：It is described to adjust
Each junction of lock sleeve is saved at least provided with two regulation lock sleeve tight fixed bolts.
5. according to claim 1 bridge cart jacking cylinder mechanical anti-falling device, it is characterised in that：The regulation lock
Tight put is symmetrically welded with adjusting nut and the outer adjusting nut difference of the spring base in two spring bases, the spring base
It is nested in inside and outside the spring base, the spring pin is by being threadably mounted at adjusting nut and institute in the spring base
State and nut interior is adjusted outside spring base.
6. according to claim 1 bridge cart jacking cylinder mechanical anti-falling device, it is characterised in that：The elasticity is adjusted
Handle is saved by being threadably mounted on the spring pin, the steel ball is buckled in inside the spring pin, the spring stack
Pin is internally provided with the stage clip held out against between the steel ball and the flexible adjustment handle.
7. according to claim 1 bridge cart jacking cylinder mechanical anti-falling device, it is characterised in that：The piston rod
Concaved circular cambered surface boss set dimidiation is nested in outside the ball rod tightening round nut, the piston rod concaved circular cambered surface boss set
Outer face center is formed to be buckled in groove at the top of the circular groove that a circle caves inward, the steel ball.
8. the field bridge cart jacking cylinder mechanical anti-falling device according to claim 1 or 7, it is characterised in that：The work
Each junction of stopper rod concaved circular cambered surface boss set covers tight fixed bolt at least provided with two piston rod concaved circular cambered surface boss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710608166.5A CN107324237A (en) | 2017-07-24 | 2017-07-24 | Field bridge cart jacking cylinder mechanical anti-falling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710608166.5A CN107324237A (en) | 2017-07-24 | 2017-07-24 | Field bridge cart jacking cylinder mechanical anti-falling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107324237A true CN107324237A (en) | 2017-11-07 |
Family
ID=60199989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710608166.5A Pending CN107324237A (en) | 2017-07-24 | 2017-07-24 | Field bridge cart jacking cylinder mechanical anti-falling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107324237A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108202170A (en) * | 2017-11-24 | 2018-06-26 | 杨海才 | A kind of modified equipment manufacturing gantry type cutting device |
| CN108213578A (en) * | 2017-11-24 | 2018-06-29 | 杨海才 | A kind of New Equipments manufacture gantry type cutting device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201128661Y (en) * | 2007-08-22 | 2008-10-08 | 宁波大榭招商国际码头有限公司 | Gantry crane lifting device with oil cylinder base anti-dropping mechanism |
| JP4945681B1 (en) * | 2010-11-24 | 2012-06-06 | 株式会社コスメック | Cylinder device with booster mechanism |
| JP2014043903A (en) * | 2012-08-27 | 2014-03-13 | Howa Mach Ltd | Magnet type rodless cylinder |
| CN204369473U (en) * | 2014-11-27 | 2015-06-03 | 天津港太平洋国际集装箱码头有限公司 | The rubber tired crane jacking cylinder that a kind of anti-piston rod falls |
| CN106144940A (en) * | 2016-08-17 | 2016-11-23 | 天津港欧亚国际集装箱码头有限公司 | A kind of field bridge cart jacking cylinder stopping means |
| CN206246451U (en) * | 2016-11-09 | 2017-06-13 | 洛阳市黄河软轴控制器股份有限公司 | Intelligent electric-controlled Pneumatic change-speed control system stop cylinder |
| CN207330223U (en) * | 2017-07-24 | 2018-05-08 | 赤湾集装箱码头有限公司 | Field bridge cart jacking cylinder mechanical anti-falling device |
-
2017
- 2017-07-24 CN CN201710608166.5A patent/CN107324237A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201128661Y (en) * | 2007-08-22 | 2008-10-08 | 宁波大榭招商国际码头有限公司 | Gantry crane lifting device with oil cylinder base anti-dropping mechanism |
| JP4945681B1 (en) * | 2010-11-24 | 2012-06-06 | 株式会社コスメック | Cylinder device with booster mechanism |
| JP2014043903A (en) * | 2012-08-27 | 2014-03-13 | Howa Mach Ltd | Magnet type rodless cylinder |
| CN204369473U (en) * | 2014-11-27 | 2015-06-03 | 天津港太平洋国际集装箱码头有限公司 | The rubber tired crane jacking cylinder that a kind of anti-piston rod falls |
| CN106144940A (en) * | 2016-08-17 | 2016-11-23 | 天津港欧亚国际集装箱码头有限公司 | A kind of field bridge cart jacking cylinder stopping means |
| CN206246451U (en) * | 2016-11-09 | 2017-06-13 | 洛阳市黄河软轴控制器股份有限公司 | Intelligent electric-controlled Pneumatic change-speed control system stop cylinder |
| CN207330223U (en) * | 2017-07-24 | 2018-05-08 | 赤湾集装箱码头有限公司 | Field bridge cart jacking cylinder mechanical anti-falling device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108202170A (en) * | 2017-11-24 | 2018-06-26 | 杨海才 | A kind of modified equipment manufacturing gantry type cutting device |
| CN108213578A (en) * | 2017-11-24 | 2018-06-29 | 杨海才 | A kind of New Equipments manufacture gantry type cutting device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107956834B (en) | Combined type multi-cylinder linkage buffer and application thereof | |
| CN202897923U (en) | Combined type hydraulic jack | |
| CN107324237A (en) | Field bridge cart jacking cylinder mechanical anti-falling device | |
| CN106628272A (en) | Explosive unlocking device with bidirectional bearing function | |
| CN110697089A (en) | Combined type bears non-firer greatly and connects separator | |
| CN207330223U (en) | Field bridge cart jacking cylinder mechanical anti-falling device | |
| CN106284344B (en) | A kind of hydraulic single-cylinder tensioner | |
| CN203047220U (en) | Heavy machinery and supporting leg for heavy machinery | |
| CN101362582A (en) | Durable hydraulic operating gear | |
| CN207390901U (en) | A kind of super-pressure mechanical caging hydraulic jack | |
| CN202228588U (en) | Bi-directional limiting elastic daub damper | |
| CN203513172U (en) | Multistage jack with six feet | |
| CN203365144U (en) | Cab anti-rolling performance test vertical loading device | |
| CN206530567U (en) | Hydraulic cylinder | |
| CN107724295A (en) | A kind of universal self- recoverage anticollision pile | |
| CN201694786U (en) | Separated type hydraulic jack with improved structure | |
| CN103590389B (en) | Lash adjusting device and dynamic compaction machinery | |
| CN202789368U (en) | Pneumatic three-fluid grouting pump | |
| CN210340187U (en) | High-precision thread self-locking hydraulic jack | |
| CN211258669U (en) | Anchor rod with resistance-increasing large-deformation yielding function | |
| CN115217494A (en) | Elastic telescopic tunnel steel arch frame | |
| CN210531306U (en) | Ultrahigh-pressure heightening type hydraulic oil cylinder | |
| CN206244320U (en) | Piston self-locking type hydraulic jack | |
| CN203516277U (en) | Multi-stage upside-down oil cylinder with two hinged shafts | |
| CN204983678U (en) | Automatic hydraulic pressure double -cylinder high strength bolt tensioner resets |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171107 |