CN109969959A - Three cylinder assemblies of hoisting arm expansion and three-level telescopic arm - Google Patents
Three cylinder assemblies of hoisting arm expansion and three-level telescopic arm Download PDFInfo
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- CN109969959A CN109969959A CN201910347218.7A CN201910347218A CN109969959A CN 109969959 A CN109969959 A CN 109969959A CN 201910347218 A CN201910347218 A CN 201910347218A CN 109969959 A CN109969959 A CN 109969959A
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- level
- connecting tube
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- 230000000712 assembly Effects 0.000 title claims abstract description 24
- 238000000429 assembly Methods 0.000 title claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 230000001960 triggered effect Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 25
- 239000010720 hydraulic oil Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000012141 concentrate Substances 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
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
- F15B11/205—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members the position of the actuator controlling the fluid flow to the subsequent actuator
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/07—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors in distinct sequence
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Actuator (AREA)
Abstract
A kind of three cylinder assemblies of hoisting arm expansion and three-level telescopic arm, three cylinder assemblies include one, two, three-level cylinder, one, secondary cylinder center extends through first, two center-poles, first, two center-poles are each passed through one, second level cylinder piston rod, first center-pole is connected to by the first connecting tube with first-stage cylinder rodless cavity, first connecting tube is equipped with check valve, first, two center-poles are connected to by the second connecting tube, check valve is equipped between second connecting tube and the first center-pole, second center-pole is connected to by third connecting tube with three-level cylinder rodless cavity, third connecting tube is equipped with check valve, second center-pole is connected to three-level cylinder piston rod by the 4th connecting tube, 4th connecting tube is equipped with check valve, first center-pole is connected to oil inlet pipe；Three-level telescopic arm includes three cylinder assemblies of one, two, three semi-girders and hoisting arm expansion, and one, two, three semi-girders are connect with one, two, three cylinder respectively.Structure of the invention is ingenious, not by load variation can sequential telescopic, improve oil cylinder working-pressure, reduce cost.
Description
Technical field
The present invention relates to multi-stage oil cylinder control technology fields, in particular relate to a kind of hoisting arm expansion three cylinder assemblies and three-level
Telescopic arm.
Background technique
The oil cylinder of existing loop wheel machine telescopic arm uses following two mode:
1, using single cylinder mode: its first telescopic arm is connect with oil cylinder, and other telescopic arms are driven by drag-line, and oil cylinder is stretched
Drive all telescopic arms flexible while contracting.The shortcoming of this structure is: (1) all telescopic arm simultaneous retractables, Wu Fadan
Solely movement and control；(2) hoist is impacted, no matter hanging multiple cargo, a minimum section telescopic arm can all stretch out, and to meet maximum
Hoist requires just to need a minimum section telescopic arm being designed more sturdy, and which adds the weight of entire boom, reduce
The lifting performance of boom；(3) since oil cylinder drives multi-stage telescopic arms simultaneously, cylinder force increases more times, shortens oil cylinder
Service life；
2, using twin-stage cylinder mode: first-stage cylinder is connect with the first telescopic arm, and secondary cylinder is connect with the second telescopic arm, subsequent
Telescopic arm passes through drag-line and the second telescopic arm simultaneous retractable.The shortcoming of this structure is: (1) telescopic arm accomplishes three sections or more
When, it needs to drive third telescopic arm and later telescopic arm by drag-line, the stress of secondary cylinder and the joint number of telescopic arm are related, section
Number is more, and stress multiple is bigger；(2) cracking pressure for needing to overcome sequence valve when secondary cylinder stretches out, consumes a part of hydraulic pressure system
System pressure, reduces the thrust of first-stage cylinder, reduces with the ability for carrying stretching；(3) it when the resistance that first-stage cylinder drives is larger, reaches
To sequence valve cracking pressure when, first-stage cylinder and secondary cylinder can stretch out simultaneously, can not achieve sequence stretch out function.
Therefore, how to design a kind of hoisting arm expansion that can solve above-mentioned technical problem is with three cylinder assemblies and three-level telescopic arm
The project that the present inventor concentrates on studies.
Summary of the invention
The object of the present invention is to provide a kind of three cylinder assemblies of hoisting arm expansion and three-level telescopic arm, smart structural design,
Not by load variation influenced can sequential telescopic, can be improved oil cylinder working-pressure, reduction cost.
In order to realize above scheme, the present invention provides a kind of hoisting arm expansion three cylinder assemblies, including first-stage cylinder, second level
Cylinder and three-level cylinder, the first-stage cylinder, secondary cylinder center extended through the first center-pole and the second center-pole, in described first
Core bar, the second center-pole are each passed through the piston rod cavity of first-stage cylinder, secondary cylinder, and first center-pole leads to after stretching out first-stage cylinder
It crosses the first connecting tube to be connected to the rodless cavity of first-stage cylinder, first connecting tube is equipped with the first check valve, first center
Bar is connected to the second center-pole by the second connecting tube, and it is unidirectional that second is equipped between second connecting tube and the first center-pole
Valve, second center-pole are connected to by third connecting tube with the rodless cavity of three-level cylinder after stretching out secondary cylinder, the third connection
Pipe is equipped with third check valve, is connected between second center-pole and the piston rod of three-level cylinder by the 4th connecting tube, described
4th connecting tube is equipped with the 4th check valve, and first center-pole is connected to the first oil inlet pipe.
Three cylinder assemblies of hoisting arm expansion of the present invention, wherein the rod chamber of the first-stage cylinder is connected to the second oil inlet pipe, it is described
The rod chamber of first-stage cylinder is connected to by the 5th connecting tube with the rod chamber of secondary cylinder, and the rod chamber of the secondary cylinder connects by the 6th
Adapter tube is connected to the rod chamber of three-level cylinder, and the first trigger assembly, the three-level are equipped between the secondary cylinder and the first check valve
It is equipped with the second trigger assembly between cylinder and third check valve, first check valve is triggered when first trigger assembly touches
It opens, the third check valve is triggered when second trigger assembly touches and is opened.
Three cylinder assemblies of hoisting arm expansion of the present invention, wherein first trigger assembly includes connected on the first check valve
The bracket connected on one mandril and the secondary cylinder cylinder body, the suspension end of the bracket are connected with the first collision block, and described first hits
Block faces first mandril, and when the cylinder body of the secondary cylinder retracts, first collision block and first mandril are collided,
First check valve is opened.
Three cylinder assemblies of hoisting arm expansion of the present invention, wherein second trigger assembly includes connected on third check valve
The rolling wheel support connected on two mandrils and the three-level cylinder cylinder body, the suspension end of the rolling wheel support are connected with the second collision block, institute
It states the second collision block and faces second mandril, when the cylinder body of the three-level cylinder retracts, second collision block and described second
Mandril collision, the third check valve is opened.
Three cylinder assemblies of hoisting arm expansion of the present invention, wherein the piston rod of cylinder body one end of the first-stage cylinder and the secondary cylinder
Hingedly, cylinder body one end of the secondary cylinder and the piston rod of the three-level cylinder are hinged.
A kind of three-level telescopic arm, it is described in any item including a semi-girder, two semi-girders, three semi-girders and claim 1-5
Three cylinder assemblies of hoisting arm expansion, a semi-girder are connect with the cylinder body of the first-stage cylinder, two semi-girder and the secondary cylinder
Cylinder body connection, three semi-girder are connect with the cylinder body of the three-level cylinder.
After adopting the above scheme, hoisting arm expansion of the present invention is had the advantages that with three cylinder assemblies and three-level telescopic arm
1, using three telescopic oil cylinder, that is, first-stage cylinders, secondary cylinder and three-level cylinder, the piston rod of three telescopic oil cylinders can be complete
Accomplish to stretch in order entirely, a semi-girder, two semi-girders and three semi-girders is made sequentially to stretch, is not influenced by load variation；
2, three telescopic oil cylinders i.e. first-stage cylinder, the thrust of secondary cylinder, three-level cylinder are improved, uses the pressure of hydraulic oil completely
In the movement of each telescopic oil cylinder, without the pressure loss；
3, due to the increase of three telescopic oil cylinder thrust, three telescopic oil cylinders can be designed to the model of more small dimension,
Cost is saved；
4, boom joint number can be designed more using three telescopic oil cylinders, lifting radius is bigger.
Detailed description of the invention
Fig. 1 is the schematic perspective view of three cylinder assemblies of hoisting arm expansion of the present invention；
Fig. 2 is the schematic illustration of three cylinder assemblies of hoisting arm expansion of the present invention.
Specific embodiment
As shown in Figure 1, three cylinder assemblies of hoisting arm expansion of the present invention include three telescopic oil cylinders, i.e. first-stage cylinder 1, secondary cylinder 2
With three-level cylinder 3, wherein first-stage cylinder 1, secondary cylinder 2 center extend through in the first center-pole 4 of tubulose and the second of tubulose
Core bar 5, the first center-pole 4, the second center-pole 5 are each passed through the piston rod cavity of first-stage cylinder 1, secondary cylinder 2, the first center-pole 4
It is connected to by the first connecting tube 6 with the rodless cavity of first-stage cylinder 1 after stretching out first-stage cylinder 1, the first connecting tube 6 is equipped with the first check valve
7, the first center-pole 4 is connected to the second center-pole 5 by the second connecting tube 8, is set between the second connecting tube 8 and the first center-pole 4
It is connected to by third connecting tube 10 with the rodless cavity of three-level cylinder 3 after thering is second one-way valve 9, the second center-pole 5 to stretch out secondary cylinder 2,
Third connecting tube 10 is equipped with third check valve 11, passes through the 4th connecting tube between the second center-pole 5 and the piston rod of three-level cylinder 3
12 connections, the 4th connecting tube 12 are equipped with the 4th check valve 13, and the first center-pole 4 is connected to the first oil inlet pipe 14.
The rod chamber of first-stage cylinder 1 is connected to the second oil inlet pipe 15, and the rod chamber of first-stage cylinder 1 passes through the 5th connecting tube 16 and two
The rod chamber connection of grade cylinder 2, the rod chamber of secondary cylinder 2 are connected to by the 6th connecting tube 17 with the rod chamber of three-level cylinder 3, secondary cylinder
2 and first are equipped with the first trigger assembly between check valve 7, and the first trigger assembly includes the first top connected on the first check valve 7
The bracket 19 of the cylinder body tail portion of bar 18 and secondary cylinder 2 welding.The suspension end of bracket 19 is connected with the first collision block 20, the first collision block 20
The first mandril 18 is faced, when the cylinder body of secondary cylinder 2 retracts, the first collision block 20 and the first mandril 18 are collided, unidirectional by first
Valve 7 is opened.The second trigger assembly is equipped between three-level cylinder 3 and third check valve 11, the second trigger assembly includes third check valve
The rolling wheel support 22 of the cylinder body tail portion welding of the second mandril 21 and three-level cylinder 3 that are connected on 11.The suspension end of rolling wheel support 22 connects
Be connected to the second collision block 23, the second collision block 23 faces the second mandril 21, when the cylinder body of three-level cylinder 3 retracts, the second collision block 23 with
The collision of second mandril 21, third check valve 11 is opened.
The piston rod of cylinder body one end of first-stage cylinder 1 and secondary cylinder 2 is hinged by pin shaft, cylinder body one end and three of secondary cylinder 2
The piston rod of grade cylinder 3 is hinged by pin shaft.
Three-level telescopic arm of the present invention, including a semi-girder, two semi-girders, three semi-girders and above-mentioned hoisting arm expansion shown in FIG. 1 are with three
Cylinder assembly, a semi-girder are connect with the cylinder body of first-stage cylinder 1, and two semi-girders are connect with the cylinder body of secondary cylinder 2, three semi-girders and three-level cylinder 3
Cylinder body connection.
Refering to what is shown in Fig. 2, the stretching process of three telescopic oil cylinders are as follows: first center-pole 4 of the hydraulic oil Jing Guo first-stage cylinder 1 is beaten
The first check valve 7 is opened, into the rodless cavity of first-stage cylinder 1, the piston rod of first-stage cylinder 1 is protruding, when the piston of first-stage cylinder 1 is run
When to end of travel, second one-way valve 9 is opened, hydraulic oil enters the inner cavity of the second center-pole 5 of secondary cylinder 2, then opens third
Check valve 11 enters the rodless cavity of secondary cylinder 2, stretches out the piston rod of secondary cylinder 2, the piston of secondary cylinder 2 runs to end of travel
When, the 4th check valve 13 is opened, hydraulic oil enters the rodless cavity of three-level cylinder 3, and the piston rod of three-level cylinder 3 is protruding until stroke
End；
The retraction process of three telescopic oil cylinders are as follows: hydraulic oil enters the rod chamber of first-stage cylinder 1, due to first-stage cylinder 1, secondary cylinder
2 and the rod chamber of three-level cylinder 3 communicate completely, centre is without any hydraulic valve, at this moment first-stage cylinder 1, secondary cylinder 2 and three-level cylinder 3
Piston rod is all in the state of stretching, and the first check valve 7, third check valve 11 are in closed position, by first-stage cylinder 1 and secondary cylinder 2
Rodless cavity hydraulic oil seal, hydraulic oil is unable to oil return, retract the piston rod of first-stage cylinder 1, secondary cylinder 2 cannot, and three-level
The hydraulic oil of the rodless cavity of cylinder 3 opens the 4th check valve 13 on secondary cylinder 2 (in secondary cylinder under the promotion of 3 piston of three-level cylinder
When piston rod is fully extended, the 4th check valve 13 is in the open state), into the inner cavity of the second center-pole 5, then open first-stage cylinder
Second one-way valve 9 (when the piston rod of first-stage cylinder 1 is fully extended, second one-way valve 9 is in the open state) on 1, by
The piston rod of one center-pole, 4 oil return, three-level cylinder 3 retracts；When 3 piston rod of three-level cylinder is fully retracted, on three-level cylinder 3
Two collision blocks 23 push down the second mandril 21, open third check valve 11, and the rodless cavity hydraulic oil of secondary cylinder 2 is made to enter the second center-pole
5 inner cavity, then open in first-stage cylinder 1 second one-way valve 9 (when the piston rod of first-stage cylinder 1 is fully extended, second one-way valve 9
It is in the open state), by 4 oil return of the first center-pole, the piston rod of secondary cylinder 2 is retracted；When the piston rod of secondary cylinder 2 contracts completely
Hui Shi, the first collision block 20 on secondary cylinder 2 push down the first mandril 18, open the first check valve 7, make first-stage cylinder 1 without bar
Chamber hydraulic oil enters the inner cavity oil return of the first center-pole 4, and the piston rod of first-stage cylinder 1 retracts.
Embodiment described above is only that preferred embodiments of the present invention will be described, not to the scope of the present invention
It is defined, without departing from the spirit of the design of the present invention, this field ordinary engineering and technical personnel is to technology of the invention
The various changes and improvements that scheme is made, should fall within the scope of protection determined by the claims of the present invention.
Claims (6)
1. a kind of three cylinder assemblies of hoisting arm expansion, which is characterized in that including first-stage cylinder, secondary cylinder and three-level cylinder, the first-stage cylinder,
The center of secondary cylinder has extended through the first center-pole and the second center-pole, and first center-pole, the second center-pole are worn respectively
The piston rod cavity of first-stage cylinder, secondary cylinder is crossed, first center-pole passes through the first connecting tube and first-stage cylinder after stretching out first-stage cylinder
Rodless cavity connection, first connecting tube is equipped with the first check valve, and first center-pole and the second center-pole pass through the
The connection of two connecting tubes, is equipped with second one-way valve between second connecting tube and the first center-pole, second center-pole stretches out
It is connected to by third connecting tube with the rodless cavity of three-level cylinder after secondary cylinder, the third connecting tube is equipped with third check valve, institute
It states and is connected between the second center-pole and the piston rod of three-level cylinder by the 4th connecting tube, it is single that the 4th connecting tube is equipped with the 4th
To valve, first center-pole is connected to the first oil inlet pipe.
2. three cylinder assemblies of hoisting arm expansion according to claim 1, which is characterized in that the rod chamber of the first-stage cylinder and
The rod chamber of the connection of two oil inlet pipes, the first-stage cylinder is connected to by the 5th connecting tube with the rod chamber of secondary cylinder, the secondary cylinder
Rod chamber be connected to the rod chamber of three-level cylinder by the 6th connecting tube, equipped with first between the secondary cylinder and the first check valve
Trigger assembly is equipped with the second trigger assembly, when first trigger assembly touches between the three-level cylinder and third check valve
It triggers first check valve to open, the third check valve is triggered when second trigger assembly touches and is opened.
3. three cylinder assemblies of hoisting arm expansion according to claim 1, which is characterized in that first trigger assembly includes the
The bracket connected on the first mandril and the secondary cylinder cylinder body connected on one check valve, the suspension end of the bracket are connected with
One collision block, first collision block face first mandril, when the secondary cylinder cylinder body retract when, first collision block with
The first mandril collision, first check valve is opened.
4. three cylinder assemblies of hoisting arm expansion according to claim 1, which is characterized in that second trigger assembly includes the
The rolling wheel support connected on the second mandril and the three-level cylinder cylinder body connected on three check valves, the suspension end of the rolling wheel support
It is connected with the second collision block, second collision block faces second mandril, when the cylinder body of the three-level cylinder retracts, described the
Two collision blocks and second mandril collide, and the third check valve is opened.
5. three cylinder assemblies of hoisting arm expansion according to claim 1, which is characterized in that cylinder body one end of the first-stage cylinder with
The piston rod of the secondary cylinder is hinged, and cylinder body one end of the secondary cylinder and the piston rod of the three-level cylinder are hinged.
6. a kind of three-level telescopic arm, which is characterized in that including an any one of semi-girder, two semi-girders, three semi-girders and claim 1-5 institute
Three cylinder assemblies of the hoisting arm expansion stated, a semi-girder are connect with the cylinder body of the first-stage cylinder, two semi-girder and the second level
The cylinder body of cylinder connects, and three semi-girder is connect with the cylinder body of the three-level cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910347218.7A CN109969959A (en) | 2019-04-26 | 2019-04-26 | Three cylinder assemblies of hoisting arm expansion and three-level telescopic arm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910347218.7A CN109969959A (en) | 2019-04-26 | 2019-04-26 | Three cylinder assemblies of hoisting arm expansion and three-level telescopic arm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109969959A true CN109969959A (en) | 2019-07-05 |
Family
ID=67086654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910347218.7A Pending CN109969959A (en) | 2019-04-26 | 2019-04-26 | Three cylinder assemblies of hoisting arm expansion and three-level telescopic arm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109969959A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3413443A1 (en) * | 1984-04-10 | 1985-10-17 | Walter Hunger KG Hydraulikzylinderwerk, 8770 Lohr | Three-stage telescopic jib |
| KR19980015813A (en) * | 1996-08-23 | 1998-05-25 | 송병순 | Sequential operation of linear boom cranes Hydraulic cylinders |
| CN202829375U (en) * | 2012-04-05 | 2013-03-27 | 大连益利亚工程机械有限公司 | Sequentially-telescopic multistage binding oil cylinder structure |
| CN105605022A (en) * | 2016-03-14 | 2016-05-25 | 三一帕尔菲格特种车辆装备有限公司 | Multi-oil-cylinder sequential telescopic mechanism and engineering machine |
| CN105650054A (en) * | 2016-03-31 | 2016-06-08 | 江阴市洪腾机械有限公司 | Dual-support hydraulic oil cylinder |
| CN209940333U (en) * | 2019-04-26 | 2020-01-14 | 江苏宏昌天马物流装备有限公司 | Three-cylinder device for telescopic boom and three-stage telescopic boom |
-
2019
- 2019-04-26 CN CN201910347218.7A patent/CN109969959A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3413443A1 (en) * | 1984-04-10 | 1985-10-17 | Walter Hunger KG Hydraulikzylinderwerk, 8770 Lohr | Three-stage telescopic jib |
| KR19980015813A (en) * | 1996-08-23 | 1998-05-25 | 송병순 | Sequential operation of linear boom cranes Hydraulic cylinders |
| CN202829375U (en) * | 2012-04-05 | 2013-03-27 | 大连益利亚工程机械有限公司 | Sequentially-telescopic multistage binding oil cylinder structure |
| CN105605022A (en) * | 2016-03-14 | 2016-05-25 | 三一帕尔菲格特种车辆装备有限公司 | Multi-oil-cylinder sequential telescopic mechanism and engineering machine |
| CN105650054A (en) * | 2016-03-31 | 2016-06-08 | 江阴市洪腾机械有限公司 | Dual-support hydraulic oil cylinder |
| CN209940333U (en) * | 2019-04-26 | 2020-01-14 | 江苏宏昌天马物流装备有限公司 | Three-cylinder device for telescopic boom and three-stage telescopic boom |
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