CN219730375U - Sequentially-extending and sequentially-retracting telescopic oil cylinder - Google Patents
Sequentially-extending and sequentially-retracting telescopic oil cylinder Download PDFInfo
- Publication number
- CN219730375U CN219730375U CN202321217926.7U CN202321217926U CN219730375U CN 219730375 U CN219730375 U CN 219730375U CN 202321217926 U CN202321217926 U CN 202321217926U CN 219730375 U CN219730375 U CN 219730375U
- Authority
- CN
- China
- Prior art keywords
- oil
- cylinder
- left end
- oil cylinder
- hydro
- 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.)
- Active
Links
- 239000003921 oil Substances 0.000 claims description 278
- 239000010720 hydraulic oil Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Actuator (AREA)
Abstract
The utility model discloses a sequentially extending and sequentially retracting telescopic oil cylinder, which relates to the technical field of telescopic oil cylinders and comprises three oil cylinders, wherein pistons are respectively arranged in each oil cylinder in a matched mode, the middle of the right side of each piston is fixedly connected with the left end of a hollow piston rod, an oil through hole is formed in the outer side of the left end of each hollow piston rod, the inside of each hollow piston rod is communicated with the right end in the oil cylinder through the oil through hole, the right end of each hollow piston rod extends out of the right side of the oil cylinder, and an oil duct I is formed in the middle of the inner bottom of the left end of each oil cylinder. The telescopic oil cylinders which are sequentially retracted after being sequentially extended can be sequentially extended and sequentially retracted when the plurality of sections of oil cylinders are connected in series, the controllability is high, the sequential extension can be realized, the first oil cylinder is extended firstly, then the second oil cylinder and the third oil cylinder are extended in sequence, the sequential retraction can be realized, and the third oil cylinder is retracted firstly, then the second oil cylinder and the first oil cylinder are retracted in sequence.
Description
Technical Field
The utility model relates to the technical field of telescopic cylinders, in particular to a telescopic cylinder capable of sequentially extending and sequentially retracting.
Background
At present, a telescopic cantilever is used in a crane, in order to improve the length of the cantilever, a plurality of telescopic cantilevers are generally used, if the telescopic cantilevers are required to be controlled independently, more hydraulic cylinders and hydraulic pipelines are required, if the hydraulic pipelines are required to be reduced, the telescopic cantilevers are telescopic in a mode that a plurality of cylinders are connected in series, but the telescopic cantilevers cannot extend out sequentially and cannot retract sequentially.
Disclosure of Invention
The utility model aims to overcome the existing defects, and provides the telescopic oil cylinder capable of sequentially extending and retracting when a plurality of sections of oil cylinders are connected in series, so that the telescopic oil cylinder is high in controllability and capable of effectively solving the problems in the background art.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the telescopic oil cylinder comprises three oil cylinders, wherein pistons are respectively matched and installed in each oil cylinder, the middle part of the right side of each piston is fixedly connected with the left end of a hollow piston rod, an oil through hole is formed in the outer side of the left end of each hollow piston rod, the hollow piston rod is communicated with the inner right end of the oil cylinder through the oil through hole, the right end of each hollow piston rod extends out of the right side of the oil cylinder, an oil duct I is formed in the middle part of the bottom of the left end of each oil cylinder, one end of the oil duct I is fixedly connected with the left end of a core tube I, the middle part of each hollow piston rod is fixedly connected with a core tube II, the left end of the core tube II extends to the left side surface of the piston, the outer side of the right end of the core tube I is matched and connected with the inner side of the left end of the core tube II, a core tube IV is fixedly connected in the hollow piston rod, the left end of the core tube IV extends to the left side surface of the piston, an oil passage II and an oil passage III are respectively arranged in the left end cylinder bottom of each oil cylinder, a cylinder bottom one-way valve is arranged in the oil passage II, the outer ends of the oil passage II and the oil passage III at the left end of the oil cylinder are both connected with one end of the oil passage II, the oil passage I at the left end of the oil cylinder is connected with one end of the oil passage I, the core tube III communicated with the oil passage II is fixedly connected in the left end cylinder bottom of each oil cylinder, the outer side of the right end of the core tube III is connected with the inner side of the left end of the core tube IV in a matched manner, the outer side of the right end of the core tube III is provided with an oil passing hole, the right end of a hollow piston rod is connected with one end of the oil passage III, the right end of the core tube II is connected with one end of the oil passage IV, the oil passage IV at the right ends of the front two oil cylinders are respectively connected with respective oil passages III at the right ends of the front two oil cylinders through one-way valves controlled by a travel switch, and the fourth oil way at the right end of the third oil cylinder is connected with the third oil way at the right end of the third oil cylinder through a one-way valve.
Further, the first oil way of the left end of the second oil cylinder is connected with the fourth middle part of the oil way of the right end of the first oil cylinder, the second oil way of the left end of the second oil cylinder is connected with the fourth right end of the core pipe in the first oil cylinder, the first oil way of the left end of the third oil cylinder is connected with the fourth middle part of the oil way of the right end of the second oil cylinder, and the second oil way of the left end of the third oil cylinder is connected with the fourth right end of the core pipe in the second oil cylinder.
Further, the hydraulic control system also comprises a reversing valve, and the reversing valve is connected with the first oil way and the second oil way at the left end of the first oil cylinder.
Further, the hydraulic control device further comprises a stroke limiting device, the telescopic end of the right end of the second oil cylinder is fixedly connected with a stroke limiting device, the left end of the stroke limiting device is correspondingly arranged with the one-way valve controlled by the stroke switch of the right end of the first oil cylinder, the telescopic end of the right end of the third oil cylinder is fixedly connected with another stroke limiting device, and the left end of the stroke limiting device is correspondingly arranged with the one-way valve controlled by the stroke switch of the right end of the second oil cylinder.
Compared with the prior art, the utility model has the beneficial effects that: the telescopic oil cylinder with the sequential extension and retraction has the following advantages: when the multiple sections of oil cylinders are connected in series, the multiple sections of oil cylinders can be sequentially extended and retracted, so that the controllability is high, and the sequential extension can be realized: the first oil cylinder stretches out firstly, then the second oil cylinder and the third oil cylinder stretch out in sequence, so that sequential retraction can be realized: the third cylinder is retracted first, then the second cylinder and the first cylinder are retracted in sequence.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic view of a partial structure of the present utility model;
FIG. 3 is a schematic view of a partial cross-sectional structure of the present utility model.
In the figure: 1 hydro-cylinder, 2 pistons, 3 hollow piston rod, 4 switching-over valve, 5 oil circuit I, 6 oil circuit II, 7 oil circuit II, 8 oil circuit III, 9 cylinder bottom check valve, 10 core tube I, 11 core tube II, 12 core tube III, 13 core tube IV, 14 oil circuit III, 15 travel switch control check valve, 16 oil circuit IV, 17 oil holes, 18 travel stop device, 19 oil circuit I, 20 check valve.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-3, the present utility model provides a technical solution: the telescopic oil cylinder sequentially extending and sequentially retracting comprises three oil cylinders 1, wherein each oil cylinder 1 is provided with three pistons 2 respectively matched and installed, the middle part of the right side of each oil cylinder 1 is fixedly connected with the left end of a hollow piston rod 3, the outer side of the left end of each hollow piston rod 3 is provided with an oil through hole 17, the hollow piston rod 3 is communicated with the inner right end of the oil cylinder 1 through the oil through hole 17, the right end of each hollow piston rod 3 extends out of the right side of the oil cylinder 1, the middle part of the left cylinder bottom of each oil cylinder 1 is provided with an oil duct I19, one end of the oil duct I19 is positioned in the oil cylinder 1 and is fixedly connected with the left end of a core pipe I10, the middle part of each hollow piston rod 3 is fixedly connected with a core pipe II 11, the left end of the core pipe II 11 extends to the left side surface of the piston 2, the outer side of the right end of the core pipe I10 is matched and connected with the inner side of the left end of the core pipe II 11, the hollow piston rod 3 is fixedly connected with a core pipe IV 13, the left end of the core tube IV 13 extends to the left side surface of the piston 2, the left end cylinder bottom of each cylinder 1 is also provided with an oil passage II 7 and an oil passage III 8 respectively, the oil passage II 7 is internally provided with a cylinder bottom one-way valve 9, the outer ends of the oil passage II 7 and the oil passage III 8 at the left end of the cylinder 1 are both connected with one end of an oil passage II 6, an oil passage I19 at the left end of the cylinder 1 is connected with one end of an oil passage I5, the left end cylinder bottom of each cylinder 1 is fixedly connected with a core tube III 12 communicated with the oil passage II 7, the right end outer side of the core tube III 12 is connected with the left end inner side of the core tube IV 13 in a matched manner, the right end outer side of the core tube III 12 is provided with an oil passing hole, the right end of a hollow piston rod 3 is connected with one end of an oil passage III 14, the right end of the core tube II 11 is connected with one end of an oil passage IV 16, the oil passage IV 16 at the right end of the front two cylinders 1 is respectively connected with the respective oil passages III 14 at the right ends of the front two cylinders 1 through a one-way valve 15 controlled by a travel switch, and an oil way IV 16 at the right end of the third oil cylinder 1 is connected with an oil way III 14 at the right end of the third oil cylinder 1 through a one-way valve 20.
The first oil way 5 at the left end of the second oil cylinder 1 is connected with the middle part of the fourth oil way 16 at the right end of the first oil cylinder 1, the second oil way 6 at the left end of the second oil cylinder 1 is connected with the right end of the fourth core tube 13 in the first oil cylinder 1, the first oil way 5 at the left end of the third oil cylinder 1 is connected with the middle part of the fourth oil way 16 at the right end of the second oil cylinder 1, and the second oil way 6 at the left end of the third oil cylinder 1 is connected with the right end of the fourth core tube 13 in the second oil cylinder 1.
The hydraulic oil cylinder further comprises a reversing valve 4, and the reversing valve 4 is connected with an oil way I5 and an oil way II 6 at the left end of the first oil cylinder 1.
The hydraulic oil cylinder further comprises a stroke limiting device 18, the telescopic end of the right end of the second oil cylinder 1 is fixedly connected with the stroke limiting device 18, the left end of the stroke limiting device 18 is correspondingly arranged with the one-way valve 15 controlled by the stroke switch of the right end of the first oil cylinder 1, the telescopic end of the right end of the third oil cylinder 1 is fixedly connected with the other stroke limiting device 18, and the left end of the stroke limiting device 18 is correspondingly arranged with the one-way valve 15 controlled by the stroke switch of the right end of the second oil cylinder 1.
When in use: sequentially extending: the first oil cylinder 1 extends out firstly, then the second oil cylinder 1 and the third oil cylinder 1 extend out in sequence;
sequential retraction: the third oil cylinder 1 firstly retracts, then the second oil cylinder 1 and the first oil cylinder 1 retract in sequence;
in the scheme, two sets of two layers of core tubes are arranged in an oil cylinder 1, wherein a core tube I10 and a core tube III 12 are fixed with the cylinder bottom of the oil cylinder 1, and a core tube II 11 and a core tube IV 13 are fixed with a hollow piston rod 3;
the third core tube 12 is provided with an oil passing hole at the stroke end of the oil cylinder 1, and the second oil passage 7 is provided with a cylinder bottom one-way valve 9.
The first oil duct 19 in the middle of the left end of the first oil cylinder 1 is used as a rod cavity oil way of all the oil cylinders 1, the second oil duct 7 is provided with a cylinder bottom one-way valve 9 and is used as a rodless cavity oil way of all the oil cylinders 1, and the third oil duct 8 is communicated with the rodless cavity of the oil cylinder 1 of the present stage.
The inside of the piston rod 3 is provided with three layers of oil channels, and the middle part, the core pipe II 11 and the core pipe IV 13 in the piston rod 3. The tail end of the piston rod 3 is provided with a one-way valve 15 controlled by a travel switch, and when the upper-stage oil cylinder 1 is retracted in place, the travel limiting device 18 of the upper-stage oil cylinder 1 opens the one-way valve 15 controlled by the travel switch.
The interfaces of the rodless cavity and the rod cavity of the primary oil cylinder 1 are arranged at the bottom of the cylinder, and the last oil cylinder 1 is not provided with a travel switch controlled one-way valve 15, but is provided with a common one-way valve 20.
When the reversing valve 4 controls the oil cylinder 1 to extend, high-pressure oil pumped by an external oil pump sequentially enters the rodless cavity of the oil cylinder 1 through the second oil way 6 and the third oil way 8 on the first oil cylinder 1, and hydraulic oil in the rod cavity of the oil cylinder 1 is led to the external oil tank.
All the oil cylinders 1 are in a fully contracted state in the initial state, pressure oil enters the first-stage oil cylinder 1 through the oil way II 6 and the oil way III 8, and the first-stage oil cylinder 1 pushes the piston 2 and the hollow piston rod 3 in the first-stage oil cylinder to move right to extend; the second oil duct 7 is internally provided with a cylinder bottom one-way valve 9, so that pressure oil cannot enter the subsequent oil cylinder 1 through the core pipe III 12 and the core pipe IV 13, and the subsequent oil cylinder 1 cannot extend. When the first-stage oil cylinder 1 is completely extended, the oil passing hole of the core tube III 12 at the stroke end of the oil cylinder 1 is opened, and pressure oil enters the next-stage oil cylinder 1 through the oil passing hole on the core tube III 12, the core tube IV 13, the oil way II 6 at the left end of the next-stage oil cylinder 1 and the oil way III 8 at the left end of the next-stage oil cylinder 1, and the next-stage oil cylinder 1 pushes the piston 2 and the hollow piston rod 3 inside to move right to extend. And by analogy, the first oil cylinder 1, the second oil cylinder 1 and the third oil cylinder 1 stretch out in sequence. At this time, the hydraulic oil with a rod cavity of the oil cylinder 1 of the present stage opens the one-way valve 15 controlled by the travel switch, the hydraulic oil in the rod cavity of the first oil cylinder 1 sequentially passes through the oil through hole 17, the inside of the hollow piston rod 3, the oil channel three 14, the one-way valve 15 controlled by the travel switch, the oil channel four 16, the core tube two 11, the core tube two 10, the oil channel two 19 and the oil channel two 5, and returns to the oil tank outside through the oil through hole 17, the inside of the hollow piston rod 3, the oil channel three 14, the one-way valve 20, the oil channel four 16, the core tube two 11, the core tube two 10, the oil channel two 19 and the oil channel two 5, and the hydraulic oil in the rod cavity of the second oil cylinder 1 returns to the oil channel four 16 of the first oil cylinder 1 through the oil through hole 17, the inside of the hollow piston rod 3, the oil channel three 14, the one-way valve 20, the oil channel four 16, the core tube two 11, the core tube two 10, the oil channel two 19 and the oil channel two 5, and the oil channel two are returned to the oil channel four 16 of the second oil cylinder 1, and the hydraulic oil cylinder 1 is not affected by the extension of all the hydraulic oil cylinders.
When the reversing valve 4 controls the oil cylinder to retract, high-pressure oil pumped out by an external oil pump enters a rod cavity of the oil cylinder 1, and a rodless cavity of the oil cylinder 1 is communicated with an external oil tank. At the moment, the hydraulic oil in the rodless cavity of the oil cylinder 1 at the later stage can open the cylinder bottom one-way valve 9 through the oil passage II 7 and enter an external oil tank through the oil passage II 6, so that retraction of the oil cylinders 1 at all stages is not affected.
The high-pressure oil enters the oil channels I19 of all the oil cylinders 1, at the moment, the check valve 15 controlled by the travel switch is not opened, the high-pressure oil cannot enter the oil cylinder 1 of the current stage, and only the high-pressure oil of the oil cylinder 1 of the last stage can enter the rod cavity of the oil cylinder 1 of the current stage through the oil channel IV 16, the check valve 20, the oil channel III 14, the hollow piston rod 3 and the oil through hole 17 of the current stage. When the last-stage oil cylinder 1 is completely retracted, the stroke limiting device 18 at the right end of the last-stage oil cylinder 1 opens the one-way valve 15 controlled by the stroke switch of the penultimate oil cylinder 1, and at the moment, high-pressure oil can enter a rod cavity of the penultimate oil cylinder 1 through the oil channel I5 at the left side of the penultimate oil cylinder 1, the oil channel I19 in the penultimate oil cylinder 1, the core pipe I10, the core pipe II 11, the oil channel IV 16, the one-way valve 15 controlled by the stroke switch, the oil channel III 14, the hollow piston rod 3 and the oil through hole 17, and the penultimate oil cylinder starts to retract, and then the like, so that sequential retraction from back to front is realized.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a flexible hydro-cylinder of order withdrawal is characterized in that, including hydro-cylinder (1), hydro-cylinder (1) is equipped with three, installs piston (2) in the cooperation in every hydro-cylinder (1) respectively, the left end of hollow piston rod (3) is fixedly connected in the right side middle part of piston (2), oil through hole (17) have been seted up in the left end outside of hollow piston rod (3), through oil through hole (17) and the interior right-hand member intercommunication of hydro-cylinder (1) in hollow piston rod (3), the right-hand member of hollow piston rod (3) stretches out the right side of hydro-cylinder (1), oil duct one (19) have been seted up at the bottom of the left end cylinder of every hydro-cylinder (1), oil duct one (19) are located the left end of one end fixed connection core pipe one (10) in hydro-cylinder (1), the middle part fixedly connected with core pipe two (11) of hollow piston rod (3), the left end of core pipe two (11) extends to the left side of piston (2), the right side outside of core pipe one (10) and the left end of core pipe two (11) are connected in the cooperation with the left end of core pipe two (11), the left end of core pipe two (13) is still connected to the left end of four cylinder ends (13) in the hydro-cylinder (1) respectively, be provided with cylinder bottom check valve (9) in oil duct two (7), the one end of oil duct two (7) of hydro-cylinder (1) left end and oil duct three (8) outer end all are connected oil duct two (6), the one end of oil duct one (5) is connected to oil duct one (19) of hydro-cylinder (1) left end, fixedly connected with in the left end cylinder bottom of every hydro-cylinder (1) with oil duct two (7) intercommunication core tube three (12), the right-hand member outside of core tube three (12) is connected with the left end inboard cooperation of core tube four (13), the oilhole has been seted up in the right-hand member outside of core tube three (12), the right-hand member of hollow piston rod (3) is connected with the one end of oil duct three (14), the one end of oil duct four (16) is connected to the right-hand member of core tube two (11), the oil duct four (16) of the right-hand member of preceding two hydro-cylinders (1) are connected respectively through travel switch controlled check valve (15), and the oil duct four (16) of the right-hand member of third hydro-cylinder (1) are connected through three hydro-cylinder (14) of third hydro-cylinder (1) right-hand member one end respectively.
2. The telescopic ram of claim 1, wherein the ram is sequentially retracted by sequential extension: the first oil way (5) at the left end of the second oil cylinder (1) is connected with the middle part of the fourth oil way (16) at the right end of the first oil cylinder (1), the second oil way (6) at the left end of the second oil cylinder (1) is connected with the right end of the fourth core pipe (13) in the first oil cylinder (1), the first oil way (5) at the left end of the third oil cylinder (1) is connected with the middle part of the fourth oil way (16) at the right end of the second oil cylinder (1), and the second oil way (6) at the left end of the third oil cylinder (1) is connected with the right end of the fourth core pipe (13) in the second oil cylinder (1).
3. The telescopic ram of claim 1, wherein the ram is sequentially retracted by sequential extension: the hydraulic oil pump further comprises a reversing valve (4), and the reversing valve (4) is connected with an oil way I (5) and an oil way II (6) at the left end of the first oil cylinder (1).
4. The telescopic ram of claim 1, wherein the ram is sequentially retracted by sequential extension: the hydraulic control device is characterized by further comprising a stroke limiting device (18), wherein the telescopic end of the right end of the second oil cylinder (1) is fixedly connected with a stroke limiting device (18), the left end of the stroke limiting device (18) is correspondingly arranged with a one-way valve (15) controlled by a stroke switch of the right end of the first oil cylinder (1), the telescopic end of the right end of the third oil cylinder (1) is fixedly connected with another stroke limiting device (18), and the left end of the stroke limiting device (18) is correspondingly arranged with a one-way valve (15) controlled by a stroke switch of the right end of the second oil cylinder (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321217926.7U CN219730375U (en) | 2023-05-19 | 2023-05-19 | Sequentially-extending and sequentially-retracting telescopic oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321217926.7U CN219730375U (en) | 2023-05-19 | 2023-05-19 | Sequentially-extending and sequentially-retracting telescopic oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219730375U true CN219730375U (en) | 2023-09-22 |
Family
ID=88058119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321217926.7U Active CN219730375U (en) | 2023-05-19 | 2023-05-19 | Sequentially-extending and sequentially-retracting telescopic oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219730375U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119508305A (en) * | 2024-10-12 | 2025-02-25 | 中联重科股份有限公司 | Telescopic cylinder, multi-cylinder sequential telescopic hydraulic system and telescopic engineering machinery |
-
2023
- 2023-05-19 CN CN202321217926.7U patent/CN219730375U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119508305A (en) * | 2024-10-12 | 2025-02-25 | 中联重科股份有限公司 | Telescopic cylinder, multi-cylinder sequential telescopic hydraulic system and telescopic engineering machinery |
| CN119508305B (en) * | 2024-10-12 | 2026-04-14 | 中联重科股份有限公司 | Telescopic cylinder, multi-cylinder sequential telescopic hydraulic system and telescopic engineering machinery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112320635B (en) | Piston rod of telescopic oil cylinder, telescopic oil cylinder and crane | |
| CN102536948B (en) | Oil cylinder as well as suspension arm stretching system and crane provided therewith | |
| CN220435135U (en) | Sequential telescopic serial oil cylinder with concentric core tube at cylinder bottom | |
| CN102134044B (en) | Suspension arm sequential stretching/retracting hydraulic system | |
| CN201999660U (en) | Telescopic hydraulic mechanism of crane jib | |
| CN105384091A (en) | Telescopic boom structure with a multilevel independent telescopic cylinder and crane | |
| CN111779721B (en) | Sequential telescopic oil cylinder and combination thereof | |
| CN215861082U (en) | Sequential action hydraulic cylinder | |
| CN114876911A (en) | Three-stage synchronous telescopic hydraulic oil cylinder | |
| CN112762053B (en) | A multi-stage central sleeve hydraulic cylinder structure capable of extending and retracting step by step | |
| CN118309704A (en) | Sequential telescopic oil cylinder of assembled core tube and control method thereof | |
| CN114294297A (en) | Sequential telescopic oil cylinder system, control method and equipment thereof | |
| CN111017785B (en) | Energy-saving hydraulic cylinder for reciprocating lifting | |
| CN221591381U (en) | Sequential extending oil cylinder of assembled cylinder bottom for folding arm type crane | |
| CN220098366U (en) | Double telescopic oil cylinder for realizing sequential action | |
| CN210355758U (en) | Multi-oil-cylinder sequential telescopic mechanism and elevating fire truck using same | |
| CN216478142U (en) | Two-stage oil cylinder | |
| CN120667438B (en) | Sequential telescopic oil cylinder and control valve thereof | |
| CN217682570U (en) | Three-stage synchronous telescopic hydraulic oil cylinder | |
| CN213039545U (en) | Sequential telescopic oil cylinder with novel control valve block | |
| CN111442006B (en) | A multi-cylinder sequential telescopic hydraulic system for a folding arm truck crane | |
| CN109969959B (en) | Three-cylinder device for boom telescoping and three-stage telescoping arm | |
| CN111439690B (en) | Multi-cylinder sequential telescopic hydraulic system and control method | |
| CN201916277U (en) | Cylinder | |
| CN215171177U (en) | Pump truck supporting leg hydraulic control system and pump truck |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |