CN110529460B - Two-stage telescopic arm oil cylinder of automobile crane - Google Patents
Two-stage telescopic arm oil cylinder of automobile crane Download PDFInfo
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- CN110529460B CN110529460B CN201910784465.3A CN201910784465A CN110529460B CN 110529460 B CN110529460 B CN 110529460B CN 201910784465 A CN201910784465 A CN 201910784465A CN 110529460 B CN110529460 B CN 110529460B
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- 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
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- 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
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- 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
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- 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
Abstract
The invention relates to the field of automobile cranes, in particular to a two-stage telescopic boom oil cylinder of an automobile crane, which comprises a two-stage cylinder barrel, a one-stage piston rod, a one-stage telescopic boom oil cylinder hydraulic lock, a two-stage telescopic boom oil cylinder hydraulic lock, a one-stage cylinder barrel inner core pipe and a two-stage cylinder oil inlet channel; a first-stage rodless cavity oil inlet channel and a rod cavity oil inlet channel are arranged in the first-stage piston rod, the first-stage rodless cavity oil inlet channel is communicated with the first-stage rodless cavity, and the rod cavity oil inlet channel is communicated with the first-stage rod cavity; one end of the primary cylinder barrel inner core pipe is arranged in the rod cavity oil inlet channel, and the other end of the primary cylinder barrel inner core pipe penetrates through the primary piston rod, the primary rodless cavity and the primary cylinder barrel in sequence and then is communicated with the secondary rod cavity of the secondary cylinder barrel; and the oil inlet channel of the secondary cylinder is communicated with the secondary rodless cavity through a hydraulic lock of the secondary telescopic arm oil cylinder. The oil cylinder can reduce the production and manufacturing difficulty of the oil cylinder, reduce the cost, reduce the weight of the oil cylinder and related parts and the arrangement difficulty of a mechanism, and has the advantages of economy and applicability.
Description
Technical Field
The invention relates to an automobile crane, in particular to a two-stage telescopic boom oil cylinder of an automobile crane.
Background
At present, in order to break through the bottleneck that a traditional crane with a structure of two oil cylinders and a rope row can only produce a five-section telescopic boom crane, some crane manufacturing companies in foreign countries develop double-stage telescopic boom oil cylinders in earlier periods, and novel four-section, five-section and six-section boom automobile cranes are developed through different combinations of the double-stage telescopic boom oil cylinders, single-stage telescopic boom oil cylinders and the double-stage telescopic boom oil cylinders and the rope row.
The structural form of the two-stage telescopic boom oil cylinder at the present foreign stage is basically as follows: the hydraulic lock of the two-stage telescopic arm oil cylinder is arranged at the tail part of the first-stage piston rod, the rodless cavity oil way of the first-stage cylinder enters from the first-stage piston rod, the rodless cavity oil way of the second-stage cylinder enters from the first-stage piston rod and enters through the inner core tube of the first-stage cylinder barrel, the rod cavity oil way of the oil cylinder enters from the tail part of the first-stage piston rod and enters into the rod cavity of the first-stage cylinder, and enters into the rod cavity of the second-stage cylinder through the gap of the double. The oil cylinder is seemingly simple, and the oil path trend is concise, however, the primary cylinder barrel has an oil passing gap, so that the processing difficulty is high, the precision requirement is high, and the manufacturing cost is high; and because an oil gap needs to be arranged, the diameter of the primary cylinder barrel of the structure is larger, so that the size of the secondary cylinder barrel is increased, the whole oil cylinder has heavier mass, the hoisting performance of the crane is influenced, and the structure is extremely not suitable for middle and small-tonnage products.
At present, the structure is also improved, for example, the oil port and the external tracking hose mechanism on the first-stage cylinder barrel and the second-stage cylinder barrel enter the rod cavity of the second-stage cylinder, however, in the mode, the tracking hose needs to be added between the two-section arm and the three-section arm, so that the cross section of the crane arm is increased, the mass of the crane arm is increased, and the hoisting performance of the crane is also influenced.
Disclosure of Invention
The invention aims to provide a double-stage telescopic arm oil cylinder of an automobile crane. The oil cylinder can reduce the production and manufacturing difficulty of the oil cylinder, reduce the cost, reduce the weight of the oil cylinder and related parts and the arrangement difficulty of a mechanism, and has the advantages of economy and applicability.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a two-stage telescopic boom oil cylinder of an automobile crane comprises a two-stage cylinder barrel, a one-stage cylinder barrel connected in the two-stage cylinder barrel, a one-stage piston rod connected in the one-stage cylinder barrel, and a one-stage telescopic boom oil cylinder hydraulic lock arranged at the tail part of the one-stage piston rod; a first-stage rodless cavity oil inlet channel and a rod cavity oil inlet channel which are connected with a first-stage telescopic arm oil cylinder hydraulic lock are arranged in the first-stage piston rod, the first-stage rodless cavity oil inlet channel is also communicated with a first-stage rodless cavity of the first-stage cylinder barrel, and the rod cavity oil inlet channel is also communicated with a first-stage rod cavity of the first-stage cylinder barrel; the hydraulic lock of the second-stage telescopic arm oil cylinder, the first-stage cylinder barrel inner core pipe and the second-stage cylinder oil inlet channel are also included; one end of the primary cylinder barrel inner core pipe is arranged in the rod cavity oil inlet channel, and the other end of the primary cylinder barrel inner core pipe penetrates through the primary piston rod, the primary rodless cavity and the primary cylinder barrel in sequence and then is communicated with the secondary rod cavity of the secondary cylinder barrel; and the oil inlet channel of the secondary cylinder is communicated with the secondary rodless cavity of the secondary cylinder barrel through the hydraulic lock of the secondary telescopic arm oil cylinder.
As a preferable scheme, the hydraulic lock of the secondary telescopic arm oil cylinder is fixed outside the secondary cylinder barrel.
As a preferred scheme, a secondary rodless cavity oil inlet is formed in the wall of the secondary cylinder barrel corresponding to the secondary rodless cavity, and the secondary rodless cavity oil inlet is connected with the secondary telescopic arm oil cylinder hydraulic lock through a hard pipe.
As a preferred scheme, the oil inlet of the secondary rodless cavity is positioned on the wall of the secondary cylinder barrel far away from the primary piston rod.
As a preferred scheme, the wall of the second-stage cylinder barrel corresponding to the second-stage rod cavity is provided with an oil hole for connecting with an oil circuit of the rod cavity of the adjacent cylinder.
Specifically, the tail end of the oil inlet channel of the rod cavity is connected with the head of the first-stage piston rod, and the front end of the oil inlet channel is closed; and a side channel communicated with the rod cavity oil inlet channel and the first rod cavity is arranged on the first-stage piston rod on the side surface of the closed end of the rod cavity oil inlet channel.
More specifically, the first-stage cylinder barrel inner core pipe comprises a straight pipe section and a bending section, the tail section of the straight pipe section is positioned in the rod cavity oil inlet channel, and the front section of the straight pipe section penetrates through the closed end of the rod cavity oil inlet channel and then enters the first-stage rodless cavity; the bending section is U-shaped and is positioned in the front end face of the first-stage cylinder barrel, one end of the bending section is communicated with the second-stage rod cavity, and the other end of the bending section is communicated with the front section of the straight pipe section in the first-stage rodless cavity.
As a preferable scheme, the hydraulic lock of the primary telescopic arm cylinder and the hydraulic lock of the secondary telescopic arm cylinder are both balance valves.
Compared with the prior art, the invention has the following beneficial effects:
the hydraulic lock of the primary cylinder of the two-stage telescopic arm oil cylinder is arranged at the tail part of the primary piston rod, the rodless cavity oil way of the primary cylinder enters from the primary piston rod, the tracking hose for the rodless cavity oil way of the secondary cylinder enters from the hydraulic lock of the secondary cylinder and the hard pipe between the tracking hose and the secondary cylinder barrel, the rod cavity oil way enters from the tail part of the primary piston rod into the rod cavity of the primary cylinder, and simultaneously enters into the rod cavity of the secondary cylinder through the inner core pipe of the primary cylinder barrel to be used as the oil passing channel of the rod cavity of the. Therefore, the inner channels of the piston rod of the primary cylinder can be reduced, the interlayer structure of the primary cylinder barrel is also cancelled, the processing and manufacturing difficulty of the double-stage telescopic arm cylinder is greatly reduced, the weight of the cylinder or other mechanisms is reduced on the premise of not changing the cylinder diameter and the rod diameter, and the double-stage telescopic arm cylinder is simple to manufacture, light in weight and low in cost.
Drawings
FIG. 1 is a schematic structural diagram of a conventional two-stage telescopic boom cylinder in the prior art;
FIG. 2 is a schematic view of the structure of the present invention.
Wherein, the names corresponding to the reference numbers are:
1-a first-stage cylinder barrel, 11-a first-stage rod cavity, 12-a first-stage rodless cavity, 2-a second-stage cylinder barrel, 21-a second-stage rod cavity, 22-a second-stage rodless cavity, 23-a second-stage rodless cavity oil inlet, 24-an oil hole, 3-a first-stage piston rod, 31-a first-stage rodless cavity oil inlet channel, 32-a rod cavity oil inlet channel, 33-a side channel, 4-a first-stage telescopic arm oil cylinder hydraulic lock, 5-a second-stage telescopic arm oil cylinder hydraulic lock, 6-a first-stage cylinder barrel inner core pipe and 7-a second-stage cylinder oil inlet channel.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
The purpose of this embodiment is in order to provide a manufacturing degree of difficulty low, long service life's mobile crane doublestage telescopic boom hydro-cylinder that is more economical and practical. Referring to fig. 1 and fig. 2, it can be found that the main structure of the present embodiment is the same as that of the prior art, such as: the cylinder head comprises a secondary cylinder barrel 2, a primary cylinder barrel 1 connected in the secondary cylinder barrel, a primary piston rod 3 connected in the primary cylinder barrel, and a primary telescopic arm oil cylinder hydraulic lock 4 arranged at the tail part of the primary piston rod; the first-stage piston rod 3 is internally provided with a first-stage rodless cavity oil inlet channel 31 and a rod cavity oil inlet channel 32 which are connected with a first-stage telescopic boom oil cylinder hydraulic lock, the first-stage rodless cavity oil inlet channel 31 is also communicated with a first-stage rodless cavity 12 of the first-stage cylinder barrel 1, and the rod cavity oil inlet channel 32 is also communicated with a first-stage rod cavity 11 of the first-stage cylinder barrel. However, in the prior art, the cylinder barrel of such a two-stage telescopic boom cylinder (such as the cylinder shown in fig. 1) has a large diameter, the whole processing difficulty is large (especially the first-stage cylinder barrel and the first-stage piston rod, the structures of the two are complex, the precision requirement is high), the cost is high, the whole cylinder has a heavy mass, the hoisting performance of the crane is affected, the use of medium and small tonnage products is not facilitated, and the improvement of the cylinder barrel in a good way is not provided at present.
In view of the above current situation, the present embodiment deeply studies the double-machine telescopic boom cylinder of the automobile crane, and creatively proposes to separate the hydraulic lock of the secondary cylinder originally arranged at the tail of the primary piston rod, and to use the oil core passing tube in the cylinder barrel of the primary telescopic boom cylinder as the common contraction cavity of the double-stage telescopic boom cylinder to communicate with the rod cavity of the secondary cylinder, so as to ensure that the processing and manufacturing difficulty of the double-stage telescopic boom cylinder (especially the processing difficulty of the primary cylinder barrel and the primary piston rod) is reduced, the weight of the cylinder or other mechanisms is reduced, and further the cost is reduced on the premise that the cylinder diameter and the rod diameter are equal.
Specifically, referring to fig. 2, the improvement of the oil cylinder of this embodiment is that the oil cylinder further includes a primary cylinder barrel inner core tube 6 and a secondary cylinder oil inlet channel 7, and the primary telescopic boom oil cylinder hydraulic lock 4 is respectively arranged at the tail of the primary piston rod, and the secondary telescopic boom oil cylinder hydraulic lock 5 is arranged outside the secondary cylinder barrel. In detail, the tail end of the rod cavity oil inlet channel 32 is connected with the head of the primary piston rod 3 (in fig. 2, B is communicated with the rod cavity oil inlet channel 32, and B is only a connecting hole of the rod head of the primary piston rod, the specific connecting mode and the structure design are the same as those in the prior art, and are not described herein), and the front end is closed; the first-stage piston rod 3 on the side face of the closed end of the rod cavity oil inlet channel 32 is provided with a side channel 33 communicated with the rod cavity oil inlet channel and the first-stage rod cavity 11, so that oil inlet of the first-stage cylinder barrel rod cavity can be realized through the head oil inlet B of the first-stage piston rod 3, the rod cavity oil inlet channel 32 and the side channel 33. The first-stage cylinder barrel inner core tube 6 comprises a straight tube section and a bending section, the tail section of the straight tube section is positioned in the rod cavity oil inlet channel 32, and the front section of the straight tube section penetrates through the closed end of the rod cavity oil inlet channel 32 and then enters the first-stage rodless cavity 12; the bending section is U-shaped and is positioned in the front end face of the first-stage cylinder barrel, one end of the bending section is communicated with the second-stage rod cavity 21, and the other end of the bending section is communicated with the front section of the straight pipe section in the first-stage rodless cavity 12, so that oil feeding of the second-stage cylinder barrel rod cavity can be realized through the oil inlet B at the head of the first-stage piston rod 3, the rod cavity oil feeding channel 32, the straight pipe section of the first-stage cylinder barrel inner core pipe and the bending section of the first-stage. This one-level cylinder inner core pipe is easily processed, can reliably guarantee the leakproofness requirement of hydro-cylinder, has saved the process of the hole of intermediate layer pipe and outer wall precision finishing (because the oil passageway size of crossing is all less, its processing degree of difficulty is not general big) compared with having the pole chamber through the intermediate layer pipeline of one-level cylinder or piston oil admission second grade cylinder among the prior art, greatly reduced the processing degree of difficulty. And this kind has the passageway setting of pole chamber oil feed to one-level cylinder, has also avoided increasing between two, three sections arms and has trailed hose mechanism, and then has avoided the size increase of three section arm height direction, alleviates jib loading boom weight, and the practicality is stronger.
Wherein, the oil inlet mode and the oil inlet channel of the rodless cavity of the first-stage cylinder barrel are not improved. The oil inlet mode of the second-stage cylinder barrel is changed, firstly, the second-stage telescopic boom oil cylinder hydraulic lock 5 is fixed outside the second-stage cylinder barrel, so that the arrangement of an oil pipe in the first-stage piston rod is facilitated, then, a second-stage rodless cavity oil inlet 23 is formed in the second-stage cylinder barrel 2 on the side face of the foremost part of the rodless cavity of the second-stage cylinder barrel, and the second-stage rodless cavity oil inlet is connected with the second-stage telescopic boom oil cylinder hydraulic lock 5 through a hard pipe. Then, a tracking hose is used as an oil inlet channel 7 of the secondary cylinder, and a rodless cavity of the secondary cylinder is communicated with a hydraulic lock 5 of the secondary telescopic arm oil cylinder and a hard pipe.
The one-level telescopic boom hydro-cylinder hydraulic lock 4 and the two-level telescopic boom hydro-cylinder hydraulic lock 5 are balanced valves, and are mature existing devices, and the connection mode of the one-level telescopic boom hydro-cylinder hydraulic lock and the use after connection are mature, and the application does not improve the one-level telescopic boom hydro-cylinder hydraulic lock, so that the rest is omitted. In addition, because the double-stage cylinder on the crane product is usually matched with another double-stage cylinder or single-stage cylinder for use, in order to realize the combined connection of the double stages and other cylinders, the wall of the second-stage cylinder barrel 2 corresponding to the second-stage rod cavity 21 is provided with an oil hole 24 connected with a common contraction cavity connected with other cylinders, and the arrangement position of the oil hole 24 can only be arranged on the side wall of the tail part of the second-stage cylinder barrel under the influence of the cylinder structure and the working condition.
By adopting the novel double-stage telescopic arm oil cylinder, the production and manufacturing difficulty of the oil cylinder can be reduced, the processing is convenient, the cost can be reduced, the weight of the oil cylinder and related parts and the arrangement difficulty of a mechanism are reduced, and the double-stage telescopic arm oil cylinder has the advantages of economy and applicability.
Claims (5)
1. A two-stage telescopic boom oil cylinder of an automobile crane comprises a two-stage cylinder barrel (2), a one-stage cylinder barrel (1) connected in the two-stage cylinder barrel, a one-stage piston rod (3) connected in the one-stage cylinder barrel, and a one-stage telescopic boom oil cylinder hydraulic lock (4) arranged at the tail part of the one-stage piston rod; a first-stage rodless cavity oil inlet channel (31) and a rod cavity oil inlet channel (32) which are connected with a first-stage telescopic arm oil cylinder hydraulic lock are arranged in the first-stage piston rod (3), the first-stage rodless cavity oil inlet channel (31) is also communicated with a first-stage rodless cavity (12) of the first-stage cylinder barrel (1), and the rod cavity oil inlet channel (32) is also communicated with a first-stage rod cavity (11) of the first-stage cylinder barrel; the double-stage telescopic boom oil cylinder of the automobile crane is characterized by further comprising a hydraulic lock (5) of the double-stage telescopic boom oil cylinder, a first-stage cylinder barrel inner core pipe (6) and a second-stage cylinder oil inlet channel (7); one end of the first-stage cylinder barrel inner core pipe (6) is arranged in the rod cavity oil inlet channel (32), and the other end of the first-stage cylinder barrel inner core pipe penetrates through the first-stage piston rod (3), the first-stage rodless cavity (12) and the first-stage cylinder barrel (1) in sequence and then is communicated with the second-stage rod cavity (21) of the second-stage cylinder barrel (2); the oil inlet channel (7) of the secondary cylinder is communicated with a secondary rodless cavity (22) of the secondary cylinder through a secondary telescopic arm oil cylinder hydraulic lock (5), the secondary telescopic arm oil cylinder hydraulic lock (5) is fixed outside the secondary cylinder (2), a secondary rodless cavity oil inlet (23) is formed in the wall of the secondary cylinder (2) corresponding to the secondary rodless cavity (22), the secondary rodless cavity oil inlet (23) is connected with the secondary telescopic arm oil cylinder hydraulic lock (5) through a hard tube, and the secondary rodless cavity oil inlet (23) is located in the wall of the secondary cylinder (2) far away from the primary piston rod (3).
2. The double-stage telescopic arm oil cylinder of the automobile crane as claimed in claim 1, wherein the wall of the second-stage cylinder barrel (2) corresponding to the second-stage rod cavity (21) is provided with an oil hole (24) for connecting with an oil circuit of the rod cavity of an adjacent oil cylinder.
3. The double-stage telescopic boom oil cylinder of the automobile crane as claimed in claim 1, wherein the tail end of the oil inlet channel (32) with the boom cavity is connected with the head of the first-stage piston rod (3), and the front end is closed; and a side channel (33) communicated with the rod cavity oil inlet channel and the one-stage rod cavity (11) is arranged on the one-stage piston rod (3) on the side surface of the closed end of the rod cavity oil inlet channel (32).
4. The two-stage telescopic boom oil cylinder of the automobile crane according to any one of claims 1 to 3, characterized in that the one-stage cylinder barrel inner core tube (6) comprises a straight tube section and a bending section, the tail section of the straight tube section is positioned in the rod cavity oil inlet channel (32), and the front section of the straight tube section penetrates through the rod cavity oil inlet channel (32) and enters the one-stage rodless cavity (12) after the closed end thereof; the bending section is U-shaped and is positioned in the front end face of the primary cylinder barrel, one end of the bending section is communicated with the secondary rod cavity (21), and the other end of the bending section is communicated with the front section of the straight pipe section in the primary rodless cavity (12).
5. The double-stage telescopic boom oil cylinder of the automobile crane according to claim 4, wherein the first-stage telescopic boom oil cylinder hydraulic lock (4) and the second-stage telescopic boom oil cylinder hydraulic lock (5) are both balance valves.
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 |
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| 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 |
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| CN110529460A CN110529460A (en) | 2019-12-03 |
| CN110529460B true CN110529460B (en) | 2021-05-07 |
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| CN201910784465.3A Active CN110529460B (en) | 2019-08-23 | 2019-08-23 | Two-stage telescopic arm oil cylinder of automobile crane |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113602980B (en) * | 2021-07-29 | 2022-10-18 | 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 |
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|---|---|---|---|---|
| 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 active Active
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 |
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| CN110529460A (en) | 2019-12-03 |
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