CN110529460A - A kind of autocrane two-stage stretching arm oil cylinder - Google Patents
A kind of autocrane two-stage stretching arm oil cylinder Download PDFInfo
- Publication number
- CN110529460A CN110529460A CN201910784465.3A CN201910784465A CN110529460A CN 110529460 A CN110529460 A CN 110529460A CN 201910784465 A CN201910784465 A CN 201910784465A CN 110529460 A CN110529460 A CN 110529460A
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- level
- cylinder
- oil inlet
- cylinder barrel
- rod chamber
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- 239000003921 oil Substances 0.000 claims abstract description 122
- 239000010727 cylinder oil Substances 0.000 claims abstract description 9
- 238000005452 bending Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 1
- 239000002355 dual-layer Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C2700/00—Cranes
- B66C2700/03—Cranes with arms or jibs; Multiple cranes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Jib Cranes (AREA)
- Actuator (AREA)
Abstract
The present invention relates to autocrane fields, more particularly to a kind of autocrane two-stage stretching arm oil cylinder, including second level cylinder barrel, level-one cylinder barrel, first stage piston bar, level-one telescopic boom cylinder hydraulic lock, second level telescopic boom cylinder hydraulic lock, level-one cylinder barrel inner core tube and secondary cylinder oil inlet passage；Level-one rodless cavity oil inlet passage and rod chamber oil inlet passage are equipped in the first stage piston bar, the level-one rodless cavity oil inlet passage is connected to level-one rodless cavity, and the rod chamber oil inlet passage is connected to level-one rod chamber；Described level-one cylinder barrel inner core tube one end is placed in rod chamber oil inlet passage, and the other end is connected to after successively running through first stage piston bar, level-one rodless cavity and level-one cylinder barrel with the second level rod chamber of second level cylinder barrel；The secondary cylinder oil inlet passage is connected to by second level telescopic boom cylinder hydraulic lock with second level rodless cavity.This oil cylinder can reduce oil cylinder and manufacture difficulty, reduce cost, mitigate oil cylinder and related components weight and arrangement of mechanism difficulty, have the advantages that economic and practical.
Description
Technical field
The present invention relates to autocranes, and in particular to a kind of autocrane two-stage stretching arm oil cylinder.
Background technique
Currently, the bottleneck of five section telescopic arm cranes can only be produced to break through two oil cylinders of conventional hoist+rope structure,
External some Crane Manufacturing Corp. develop two-stage stretching arm oil cylinder in more early period, by two-stage stretching arm oil cylinder and it is single,
Two-stage stretching arm oil cylinder+rope various combination, develops novel four section, five sections and six joint arm autocranes.
The structure type of external two-stage stretching arm oil cylinder at this stage is substantially as follows: two-stage stretching arm oil cylinder hydraulic being locked and is arranged
In first stage piston bar tail portion, first-stage cylinder rodless cavity oil circuit enters from first stage piston bar, and secondary cylinder rodless cavity oil circuit is from first stage piston
Bar enters into and through the entrance of level-one cylinder barrel inner core tube, and cylinder rod chamber oil circuit, which enters first-stage cylinder from first stage piston bar tail portion, bar
Chamber, and secondary cylinder rod chamber is entered by the dual-layer welding pipe gap of level-one cylinder barrel, and its hydraulic lock is fixed on first stage piston bar
Tail portion.This kind of oil cylinder seems simply, and oil circuit trend is succinct, however, difficulty of processing is big since level-one cylinder barrel had oily gap,
Required precision is high, and manufacturing cost is high；Also, due to needing to be arranged oily gap, the level-one cylinder barrel of this structure is relatively large in diameter, into
And secondary cylinder cylinder size is caused to increase, whole oil cylinder heavier mass, influencing crane hangs load performance, and pole is not suitable for medium and small tonnage
Product uses.
Also have for the improvement of the structure at present, for example, by external hydraulic fluid port on level-one cylinder barrel and second level cylinder barrel and
External tracking hose mechanism enters secondary cylinder rod chamber, however, this mode need to increase tracking hose between two, three joint arms, makes
Crane arm section increases, and crane arm quality increases, and the same crane that influences hangs load performance.
Summary of the invention
The purpose of the invention is to provide a kind of autocrane two-stage stretching arm oil cylinder.This oil cylinder can reduce oil
Cylinder manufactures difficulty, reduces cost, mitigates oil cylinder and related components weight and arrangement of mechanism difficulty, has economic and practical
Advantage.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of autocrane two-stage stretching arm oil cylinder, including second level cylinder barrel, the level-one cylinder barrel being connected in second level cylinder barrel,
The first stage piston bar being connected in level-one cylinder barrel, and the level-one telescopic boom cylinder hydraulic lock of first stage piston bar tail portion is set；Institute
It states and is equipped with the level-one rodless cavity oil inlet passage being connected with level-one telescopic boom cylinder hydraulic lock and rod chamber oil inlet in first stage piston bar
Channel, the level-one rodless cavity oil inlet passage are also connected to the level-one rodless cavity of level-one cylinder barrel, and the rod chamber oil inlet passage is also
It is connected to the level-one rod chamber of level-one cylinder barrel；It further include second level telescopic boom cylinder hydraulic lock, level-one cylinder barrel inner core tube and secondary cylinder
Oil inlet passage；Described level-one cylinder barrel inner core tube one end is placed in rod chamber oil inlet passage, the other end successively run through first stage piston bar,
It is connected to after level-one rodless cavity and level-one cylinder barrel with the second level rod chamber of second level cylinder barrel；The secondary cylinder oil inlet passage is stretched by second level
Contracting arm oil cylinder hydraulic lock is connected to the second level rodless cavity of second level cylinder barrel.
As a preferred embodiment, the second level telescopic boom cylinder hydraulic lock is fixed on outside second level cylinder barrel.
As a preferred embodiment, second level rodless cavity oil inlet is provided on the corresponding secondary cylinder barrel of the second level rodless cavity
Mouthful, second level rodless cavity oil inlet is connect by hard tube with second level telescopic boom cylinder hydraulic lock.
As a preferred embodiment, the second level rodless cavity oil inlet is located remotely from the secondary cylinder barrel of first stage piston bar
On.
As a preferred embodiment, oilhole is offered on the corresponding secondary cylinder barrel of the second level rod chamber, be used for and phase
The rod chamber oil circuit connection of adjacent oil cylinder.
Specifically, the rod chamber oil inlet passage tail end is connected with first stage piston club head, front end closing；It is described to have bar
The first stage piston bar that chamber oil inlet passage closes end side surface is equipped with the wing passage of connection rod chamber oil inlet passage and level-one rod chamber.
More specifically, the level-one cylinder barrel inner core tube includes straight pipe and bending segment, the endpiece of the straight pipe is located at
In rod chamber oil inlet passage, and the leading portion of straight pipe enters level-one rodless cavity behind rod chamber oil inlet passage closed end；It is described
Bending segment is in U-shape and is located in the front end face of level-one cylinder barrel, and one end is connected to second level rod chamber, the other end and level-one rodless cavity
Interior straight pipe leading portion connection.
As a preferred embodiment, the level-one telescopic boom cylinder hydraulic lock and second level telescopic boom cylinder hydraulic lock are flat
Weigh valve.
Compared with prior art, the invention has the following advantages:
Two-stage stretching arm oil cylinder first-stage cylinder hydraulic lock is arranged in first stage piston bar tail portion, first-stage cylinder rodless cavity oil by the present invention
Road enters from first stage piston bar, and secondary cylinder rodless cavity oil circuit is with tracking hose by two-level oil cylinder's hydraulic lock and between second level cylinder barrel
Hard tube enters, and rod chamber oil circuit enters first-stage cylinder rod chamber from first stage piston bar tail portion, at the same by level-one cylinder barrel inner core tube into
Enter secondary cylinder rod chamber, using as two-level oil cylinder's rod chamber oil passage.In this way, level-one cylinder piston rod internal channel can be made to reduce,
The sandwich of level-one cylinder barrel is also eliminated simultaneously, under the premise of not changing cylinder diameter and bar diameter, greatly reduces two-stage stretching
The processing and manufacturing difficulty of arm oil cylinder mitigates oil cylinder or other mechanism weight, makes to be simple to manufacture, light weight and cost is low.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of two-stage stretching arm oil cylinder conventional in the prior art；
Fig. 2 is schematic structural view of the invention.
Wherein, the corresponding title of appended drawing reference are as follows:
1- level-one cylinder barrel, 11- level-one rod chamber, 12- level-one rodless cavity, 2- second level cylinder barrel, 21- second level rod chamber, 22- bis-
Grade rodless cavity, 23- second level rodless cavity oil inlet, 24- oilhole, 3- first stage piston bar, 31- level-one rodless cavity oil inlet passage, 32- have
Rod cavity oil inlet passage, 33- wing passage, 4- level-one telescopic boom cylinder hydraulic lock, 5- second level telescopic boom cylinder hydraulic lock, 6- first-stage cylinder
Cylinder inner core tube, 7- secondary cylinder oil inlet passage.
Specific embodiment
The invention will be further described with embodiment for explanation with reference to the accompanying drawing, and mode of the invention includes but not only limits
In following embodiment.
The purpose of the present embodiment is to provide for that a kind of manufacture difficulty is low, more economical and practical automobile with long service life
Crane two-stage stretching arm oil cylinder.Referring to Fig. 1 and Fig. 2 it can be found that the main structure of the present embodiment and prior art part phase
Together, such as: including second level cylinder barrel 2, the level-one cylinder barrel 1 being connected in second level cylinder barrel, the first stage piston being connected in level-one cylinder barrel
Bar 3, and the level-one telescopic boom cylinder hydraulic lock 4 of first stage piston bar tail portion is set；It is equipped in the first stage piston bar 3 with one
Grade telescopic boom cylinder hydraulic lock connected level-one rodless cavity oil inlet passage 31 and rod chamber oil inlet passage 32, the level-one rodless cavity
Oil inlet passage 31 is also connected to the level-one rodless cavity 12 of level-one cylinder barrel 1, the rod chamber oil inlet passage 32 also with level-one cylinder barrel
Level-one rod chamber 11 is connected to.However, in the prior art this kind of two-stage stretching arm oil cylinder (oil cylinder as shown in Figure 1) cylinder barrel diameter compared with
Greatly, overall processing difficulty is big (especially level-one cylinder barrel and first stage piston bar, structure is complicated for the two, required precision is high), at high cost,
And whole oil cylinder heavier mass, it influences crane and hangs load performance, be unfavorable for medium and small volume production and use, also there is no good at present
Mode makes improvements.
The present embodiment furthers investigate autocrane two-shipper telescopic boom cylinder in view of the above status, creative
Propose two-level oil cylinder's hydraulic lock that first stage piston bar tail portion is arranged in originally is independent, and by level-one telescopic boom cylinder
Wick pipe is crossed in cylinder barrel as the public contracting chamber of two-stage stretching arm oil cylinder, two-level oil cylinder's rod chamber is connected to, to ensure in cylinder diameter and bar
Under the premise of diameter is equivalent, processing and manufacturing difficulty (especially the level-one cylinder barrel and first stage piston bar of two-stage stretching arm oil cylinder are reduced
Difficulty of processing), mitigate oil cylinder or other mechanism weight, and then reduce cost.
Specifically, referring to fig. 2, the present embodiment oil cylinder thes improvement is that the oil cylinder further comprises in level-one cylinder barrel
Core pipe 6 and secondary cylinder oil inlet passage 7, and level-one telescopic boom cylinder hydraulic lock 4 is set in first stage piston bar tail portion respectively, in second level
Second level telescopic boom cylinder hydraulic lock 5 is set outside cylinder barrel.Specifically, 32 tail end of rod chamber oil inlet passage and first stage piston
3 head of bar be connected (in attached drawing 2, B and rod chamber oil inlet passage 32 are communicated, and B is only a connecting hole of first stage piston club head,
This specific connection type and structure design with it is identical in the prior art, this will not be repeated here), front end close；The rod chamber into
The first stage piston bar 3 that end side surface is closed in oily channel 32 is equipped with the wing passage of connection rod chamber oil inlet passage and level-one rod chamber 11
33, in this way, first-stage cylinder can be realized by 3 head oil inlet B of first stage piston bar, rod chamber oil inlet passage 32, wing passage 33
The oil inlet of cylinder rod chamber.The level-one cylinder barrel inner core tube 6 includes straight pipe and bending segment, and the endpiece of the straight pipe, which is located at, bar
In chamber oil inlet passage 32, and the leading portion of straight pipe enters level-one rodless cavity 12 behind 32 closed end of rod chamber oil inlet passage；Institute
Bending segment is stated to be in U-shape and be located in the front end face of level-one cylinder barrel, one end is connected to second level rod chamber 21, the other end and level-one without
Straight pipe leading portion connection in rod cavity 12, in this way, 3 head oil inlet B of first stage piston bar, rod chamber oil inlet passage can be passed through
32, the straight pipe of level-one cylinder barrel inner core tube, level-one cylinder barrel inner core tube bending segment realize the oil inlet of second level cylinder barrel rod chamber.It should
Level-one cylinder barrel inner core tube is easy to process, can reliably guarantee the sealing requirements of oil cylinder, compared to the prior art in pass through first-stage cylinder
The Sandwich pipeline or piston Oil Guide of cylinder enter for second level cylinder barrel rod chamber, and the inner hole and outer wall precision for eliminating interlayer pipe add
The process (since oil passage size is smaller, difficulty of processing is not general big) of work, greatly reduces difficulty of processing.And
And this channel to level-one cylinder barrel rod chamber oil inlet is arranged, and also avoids increasing tracking hose mechanism between two, three joint arms,
And then the size for avoiding three joint arms short transverse increases, and mitigates crane arm weight, practicability is stronger.
Wherein, the oil inlet mode of level-one cylinder barrel rodless cavity and oil inlet passage do not improve.And the oil inlet mode of second level cylinder barrel
But changed, be that second level telescopic boom cylinder hydraulic lock 5 is fixed on outside second level cylinder barrel first, it so can be living convenient for level-one
Stopper rod inner oil tube arrangement, is then arranged the oil inlet of second level rodless cavity on the second level cylinder barrel 2 of second level cylinder barrel rodless cavity forefront side
Mouth 23, second level rodless cavity oil inlet are connect by hard tube with second level telescopic boom cylinder hydraulic lock 5.Then, made using tracking hose
For secondary cylinder oil inlet passage 7, second level cylinder barrel rodless cavity is connected with hard tube by second level telescopic boom cylinder hydraulic lock 5.
The level-one telescopic boom cylinder hydraulic lock 4 and second level telescopic boom cylinder hydraulic lock 5 are balanced valve, be one at
Ripe existing apparatus, also, the use after its connection type and connection with each pipeline is extremely mature, and the application is not to it
It improves, therefore this will not be repeated here.Further, since on crane products twin-stage cylinder usually also with an other twin-stage cylinder or list
Grade cylinder is used cooperatively, therefore, to realize that twin-stage is connect with the combination of other oil cylinders, the corresponding secondary cylinder of the second level rod chamber 21
The oilhole 24 for the public contracting chamber connection connecting with other oil cylinders is offered on 2 walls of cylinder, also, the setting position of the oilhole 24 is by oil
The influence of cylinder structure and working condition can only be arranged on the side wall of second level cylinder barrel tail portion.
Using this novel two stage telescopic boom cylinder of the present embodiment, oil cylinder can be reduced and manufacture difficulty, it is easy to process,
Cost can be also reduced, mitigates oil cylinder and related components weight and arrangement of mechanism difficulty, has the advantages that economic and practical.
Claims (8)
1. a kind of autocrane two-stage stretching arm oil cylinder, including second level cylinder barrel (2), the level-one cylinder barrel being connected in second level cylinder barrel
(1), the first stage piston bar (3) being connected in level-one cylinder barrel, and the level-one telescopic boom cylinder liquid of first stage piston bar tail portion is set
Pressure lock (4)；It is logical that the level-one rodless cavity oil inlet being connected with level-one telescopic boom cylinder hydraulic lock is equipped in the first stage piston bar (3)
Road (31) and rod chamber oil inlet passage (32), the level-one rodless cavity oil inlet passage (31) also with the level-one of level-one cylinder barrel (1) without
Rod cavity (12) connection, the rod chamber oil inlet passage (32) are also connected to the level-one rod chamber (11) of level-one cylinder barrel；Its feature exists
In further including second level telescopic boom cylinder hydraulic lock (5), level-one cylinder barrel inner core tube (6) and secondary cylinder oil inlet passage (7)；Described one
Grade cylinder barrel inner core tube (6) one end is placed in rod chamber oil inlet passage (32), and the other end successively runs through first stage piston bar (3), level-one
Rodless cavity (12) and level-one cylinder barrel (1) are connected to the second level rod chamber (21) of second level cylinder barrel (2) afterwards；The secondary cylinder oil inlet passage
(7) it is connected to by second level telescopic boom cylinder hydraulic lock (5) with the second level rodless cavity (22) of second level cylinder barrel.
2. a kind of autocrane two-stage stretching arm oil cylinder according to claim 1, which is characterized in that the second level is flexible
Arm oil cylinder hydraulic lock (5) is fixed on second level cylinder barrel (2) outside.
3. a kind of autocrane two-stage stretching arm oil cylinder according to claim 1, which is characterized in that the second level is without bar
It is provided with second level rodless cavity oil inlet (23) on corresponding second level cylinder barrel (2) wall of chamber (22), second level rodless cavity oil inlet passes through hard tube
It is connect with second level telescopic boom cylinder hydraulic lock (5).
4. a kind of autocrane two-stage stretching arm oil cylinder according to claim 1, which is characterized in that the second level is without bar
Chamber oil inlet (23) is located remotely from second level cylinder barrel (2) wall of first stage piston bar (3).
5. a kind of autocrane two-stage stretching arm oil cylinder according to claim 1, which is characterized in that the second level has bar
Oilhole (24) are offered on corresponding second level cylinder barrel (2) wall of chamber (21), for the rod chamber oil circuit connection with adjacent oil cylinder.
6. a kind of autocrane two-stage stretching arm oil cylinder according to claim 1, which is characterized in that the rod chamber into
Oily channel (32) tail end is connected with first stage piston bar (3) head, front end closing；The rod chamber oil inlet passage (32) closes end side
The first stage piston bar (3) in face is equipped with the wing passage (33) of connection rod chamber oil inlet passage and level-one rod chamber (11).
7. a kind of autocrane two-stage stretching arm oil cylinder described in any one according to claim 1~6, which is characterized in that
The level-one cylinder barrel inner core tube (6) includes straight pipe and bending segment, and the endpiece of the straight pipe is located at rod chamber oil inlet passage
(32) in, and the leading portion of straight pipe enters level-one rodless cavity (12) behind rod chamber oil inlet passage (32) closed end；It is described curved
Trisection is in U-shape and is located in the front end face of level-one cylinder barrel, and one end is connected to second level rod chamber (21), and the other end and level-one are without bar
Straight pipe leading portion connection in chamber (12).
8. a kind of autocrane two-stage stretching arm oil cylinder according to claim 7, which is characterized in that the level-one is flexible
Arm oil cylinder hydraulic locks (4) and second level telescopic boom cylinder hydraulic lock (5) is balanced valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910784465.3A CN110529460B (en) | 2019-08-23 | 2019-08-23 | Two-stage telescopic arm oil cylinder of automobile crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910784465.3A CN110529460B (en) | 2019-08-23 | 2019-08-23 | Two-stage telescopic arm oil cylinder of automobile crane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110529460A true CN110529460A (en) | 2019-12-03 |
| CN110529460B CN110529460B (en) | 2021-05-07 |
Family
ID=68664128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910784465.3A Expired - Fee Related CN110529460B (en) | 2019-08-23 | 2019-08-23 | Two-stage telescopic arm oil cylinder of automobile crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110529460B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113602980A (en) * | 2021-07-29 | 2021-11-05 | 江苏科技大学 | Remove hoist device with prevention subassembly of turning on one's side |
| CN113602979A (en) * | 2021-07-29 | 2021-11-05 | 江苏科技大学 | Ship moving and hoisting device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105351283A (en) * | 2015-10-21 | 2016-02-24 | 徐州重型机械有限公司 | Double-acting multistage synchronous telescopic oil cylinder |
| CN105417410A (en) * | 2015-12-31 | 2016-03-23 | 徐州重型机械有限公司 | Telescoping arm structure with locking mechanism and crane |
| CN105545853A (en) * | 2015-12-31 | 2016-05-04 | 徐州重型机械有限公司 | Telescopic control valve, multi-stage telescopic hydraulic system and hoist jib telescopic hydraulic control system |
| CN108302090A (en) * | 2018-01-08 | 2018-07-20 | 徐州重型机械有限公司 | A kind of multilayer core pipe two-stage hydraulic cylinder and crane |
-
2019
- 2019-08-23 CN CN201910784465.3A patent/CN110529460B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105351283A (en) * | 2015-10-21 | 2016-02-24 | 徐州重型机械有限公司 | Double-acting multistage synchronous telescopic oil cylinder |
| CN105417410A (en) * | 2015-12-31 | 2016-03-23 | 徐州重型机械有限公司 | Telescoping arm structure with locking mechanism and crane |
| CN105545853A (en) * | 2015-12-31 | 2016-05-04 | 徐州重型机械有限公司 | Telescopic control valve, multi-stage telescopic hydraulic system and hoist jib telescopic hydraulic control system |
| CN108302090A (en) * | 2018-01-08 | 2018-07-20 | 徐州重型机械有限公司 | A kind of multilayer core pipe two-stage hydraulic cylinder and crane |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113602980A (en) * | 2021-07-29 | 2021-11-05 | 江苏科技大学 | Remove hoist device with prevention subassembly of turning on one's side |
| CN113602979A (en) * | 2021-07-29 | 2021-11-05 | 江苏科技大学 | Ship moving and hoisting device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110529460B (en) | 2021-05-07 |
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Granted publication date: 20210507 |