CN109869372B - Multi-stage oil cylinder - Google Patents
Multi-stage oil cylinder Download PDFInfo
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- CN109869372B CN109869372B CN201910211814.2A CN201910211814A CN109869372B CN 109869372 B CN109869372 B CN 109869372B CN 201910211814 A CN201910211814 A CN 201910211814A CN 109869372 B CN109869372 B CN 109869372B
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- 238000001514 detection method Methods 0.000 claims abstract description 74
- 230000035772 mutation Effects 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 abstract description 4
- 208000006011 Stroke Diseases 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Abstract
The invention discloses a multi-stage oil cylinder, which comprises an outer cylinder barrel, at least one middle cylinder barrel and a piston rod, wherein a piston assembly is arranged on the piston rod and divides the interior of the outer cylinder barrel into an oil inlet cavity and an oil return cavity, the piston assembly comprises a primary piston and at least one secondary piston, the primary piston is connected with the first middle cylinder barrel, a detection oil hole is arranged on the outer cylinder barrel, a pressure sensor is connected to the detection oil hole, the primary piston is sealed with the inner wall of the outer cylinder barrel, the primary piston enables the detection oil hole to be switched from being communicated with the oil inlet cavity to be communicated with the oil return cavity or from being communicated with the oil return cavity to be communicated with the oil inlet cavity and generate pressure mutation, and the pressure sensor detects the pressure mutation of the detection oil hole to determine the regional position of the primary piston in the outer cylinder barrel. Through the mode, the multistage oil cylinder disclosed by the invention can detect regional positions in the running process of the piston, reserve enough response time, and is simple in structure, practical, convenient, safe and reliable.
Description
Technical Field
The invention relates to the field of oil cylinders, in particular to a multistage oil cylinder.
Background
The multistage cylinder is characterized in that: the working stroke can be long, and the working stroke can be shortened to be shorter when the working stroke is not working;
the multistage cylinder is mainly applied to occasions with long extension requirement travel and smaller axial installation space, such as hydraulic elevators, overhead working trucks and other engineering machinery. The conventional multistage cylinders basically extend out in a sleeve type and step-by-step sequence, and when the stage is changed, the abrupt change of output force and speed can be caused due to the fact that the cross sections of the large cavity and the annular small cavity between two adjacent stages are different; in addition, the rod end is connected with a load, and the vibration phenomenon can be caused during the stage change. For some occasions with high stability requirements, such as vertical lifting machinery, the situation can be that equipment or people are loaded, so that certain safety hazards are necessarily caused by a conventional structure and a hydraulic system.
At present, the market generally controls the flow of an oil way through a system, reduces the acceleration of the extending speed caused by stage change, controls the output oil quantity of the oil way according to the actual oil passing area of each stage, and slows down the fluctuation of the extending speed. The flow is controlled by the system, which is usually to add a buffer structure at the end of each stage of stroke and output a signal after the end is turned to the bottom, so as to control the electromagnetic valve to control the flow valve or the flow pump. The hysteresis exists on signal feedback, namely after each stage of stroke is completed, damping resistance is generated by virtue of a self buffer structure, the speed is slowed down, so that trapped pressure is formed by changing, and the oil pressure rise has higher requirements on all parts and sealing in the buffer stroke at the end of the stroke; and the post-signal output is lagged, so that the response time reserved for the system is reduced, and the effect of actually relieving the level-change vibration is not ideal.
Disclosure of Invention
The technical problem to be solved mainly by the invention is to provide the multi-stage oil cylinder which can detect regional positions in the running process of the piston, reserve enough response time, has simple structure, is practical, convenient, safe and reliable.
In order to solve the technical problems, the invention adopts a technical scheme that: the utility model provides a multistage hydro-cylinder, including outer cylinder, at least one middle cylinder and piston rod, be equipped with the piston subassembly on the piston rod, the piston subassembly separates oil inlet chamber and oil return chamber in with outer cylinder, the piston subassembly includes one-level piston and at least one secondary piston, one-level piston is connected with first-level middle cylinder, be equipped with a detection oilhole on the outer cylinder, be connected with pressure sensor on the detection oilhole, seal between the inner wall of one-level piston and outer cylinder, one-level piston is located when detecting oilhole left side, detects oilhole and oil return chamber intercommunication, one-level piston is located when detecting oilhole right side, detect oilhole and oil inlet chamber intercommunication, one-level piston makes the detection oilhole switch over to with oil return chamber intercommunication or from with oil return chamber intercommunication and oil inlet chamber intercommunication and produce pressure mutation through detecting the oilhole's pressure mutation in order to confirm the regional position of one-level piston in outer cylinder.
In a preferred embodiment of the present invention, a sealing ring is disposed on the primary piston, the sealing ring seals between the primary piston and the outer cylinder, when the sealing ring is located at the left side of the detection oil hole, the detection oil hole is communicated with the oil return cavity, and when the sealing ring is located at the right side of the detection oil hole, the detection oil hole is communicated with the oil inlet cavity.
In a preferred embodiment of the present invention, the seal ring switches the detection oil hole from being communicated with the oil inlet cavity to being communicated with the oil return cavity or from being communicated with the oil inlet cavity to generating pressure mutation through the detection oil hole.
In a preferred embodiment of the present invention, the detection oil hole is located at the right end of the outer cylinder, and when the primary piston extends to a maximum distance, a space is provided between the detection oil hole and the seal ring.
In a preferred embodiment of the present invention, the pressure sensor is connected with a control device for adjusting the flow rate of the system.
In a preferred embodiment of the invention, the number of intermediate cylinders is 1.
In a preferred embodiment of the present invention, the number of the intermediate cylinders is more than 2, secondary detection oil holes are formed in all the remaining intermediate cylinders except for the final intermediate cylinder in the intermediate cylinders, the secondary piston detects the external position of the secondary piston in the intermediate cylinder through the corresponding secondary detection oil holes, and the secondary detection oil holes are communicated with the detection oil holes.
In a preferred embodiment of the present invention, the detecting oil hole is a stepped detecting oil hole, and a diameter of a mouth portion of the stepped detecting oil hole is larger than a diameter of a bottom portion of the stepped detecting oil hole.
The beneficial effects of the invention are as follows: the multistage oil cylinder can detect regional positions in the running process of the piston, reserves enough response time, has simple structure, is practical and convenient, and is safe and reliable.
Drawings
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a schematic view of a multistage cylinder according to a preferred embodiment of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a state diagram of a seal ring of a multistage oil cylinder failing to pass through a detection oil hole;
FIG. 4 is a view showing a state in which a seal ring of a multistage oil cylinder is passing through a detection oil hole;
FIG. 5 is a state diagram of a seal ring of a multistage oil cylinder passing through a detection oil hole;
the components in the drawings are marked as follows: 1. the device comprises an outer cylinder barrel, 2, a middle cylinder barrel, 3, a piston rod, 4, a piston assembly, 5, an oil inlet cavity, 6, an oil return cavity, 7, a primary piston, 8, a secondary piston, 9, a detection oil hole, 10, a pressure sensor, 11 and a sealing ring.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 2, a multistage cylinder comprises an outer cylinder 1, at least one middle cylinder 2 and a piston rod 3, wherein a piston assembly 4 is arranged on the piston rod 3, the piston assembly 4 separates an oil inlet cavity 5 and an oil return cavity 6 in the outer cylinder 1, the piston assembly 4 comprises a primary piston 7 and at least one secondary piston 8, the primary piston 7 is connected with the first middle cylinder 2, a detection oil hole 9 is arranged on the outer cylinder 1, a pressure sensor 10 is connected to the detection oil hole 9, a seal is arranged between the primary piston 7 and the inner wall of the outer cylinder 1, when the primary piston 7 is positioned on the left side of the detection oil hole 9, the detection oil hole 9 is communicated with the oil return cavity 6, when the primary piston 7 is positioned on the right side of the detection oil hole 9, the detection oil hole 9 is communicated with the oil inlet cavity 5, the primary piston 7 is switched from being communicated with the oil inlet cavity 5 to being communicated with the oil return cavity 6 or from being communicated with the oil return cavity 6 to being communicated with the oil inlet cavity 5 and generating pressure mutation, and the pressure mutation is detected by the pressure sensor 10 to determine the regional position of the primary piston 7 in the outer cylinder 1.
In addition, be equipped with sealing washer 11 on the one-level piston 7, sealing washer makes between 11 one-level piston 7 and the outer cylinder 1 sealed, and when sealing washer 11 was located the detection oilhole 9 left side, detection oilhole 9 and oil return chamber 6 intercommunication, and when sealing washer 11 was located the detection oilhole 9 right side, detection oilhole 9 and oil feed chamber 5 intercommunication.
In addition, the seal ring 11 switches the detection oil hole 9 from communicating with the oil inlet chamber 5 to communicating with the oil return chamber 6 or from communicating with the oil return chamber 6 to communicating with the oil inlet chamber 5 through the detection oil hole 9 and generates a pressure abrupt change.
In addition, the detection oil hole 9 is positioned at the right end of the outer cylinder barrel 1, and when the primary piston 7 extends to the maximum distance, a space is reserved between the detection oil hole 9 and the sealing ring 11. The distance between the detection oil hole 9 and the sealing ring 11 is adjusted according to the running speed of the piston rod 3 and the time required by the actual reflection adjustment of the control device, and the distance can be used for reserving enough adjustment time between the about-to-be-replaced stages of the piston rod of the multistage cylinder so as to reduce the vibration of the multistage cylinder during the stage replacement.
A control device for adjusting the system flow rate is connected to the pressure sensor 10.
In addition, the number of intermediate cylinders 2 is 1.
In addition, the number of the middle cylinder barrels 2 is more than 2, secondary detection oil holes are formed in all the rest middle cylinder barrels 2 except the middle cylinder barrel of the final stage in the middle cylinder barrels 2, the secondary piston 8 is used for detecting the external arrangement of the secondary piston 8 in the middle cylinder barrels 2 through the corresponding secondary detection oil holes, and the secondary detection oil holes are communicated with the detection oil holes.
The detection oil hole 9 is a stepped detection oil hole, and the diameter of the mouth is larger than the diameter of the bottom.
The specific working principle of the multistage oil cylinder is as follows: when the oil inlet cavity 5 starts to feed oil, the middle cylinder barrel 2 drives the piston rod 3 to extend, and referring to fig. 3, the sealing ring 11 on the primary piston 7 seals the inner wall of the outer cylinder barrel 1, and at the moment, the primary piston 7 is positioned at the left side of the detection oil hole 9, the detection oil hole 9 is connected with the oil return cavity 6, and the pressure sensor 10 detects the pressure of the oil return cavity 6; referring to fig. 4, after the piston rod 3 continues to extend, after the sealing ring 11 on the primary piston 7 passes through the detection oil hole 9, the detection oil hole 9 is switched to be connected with the oil inlet cavity 5 because the primary piston 7 is sealed with the outer cylinder 1, the pressure sensor 10 detects the pressure of the oil inlet cavity 5, when the sealing ring 11 passes through the detection oil hole 9, the pressure of the oil return cavity 6 is different from the pressure of the oil inlet cavity 5 because the detection oil hole 9 is switched from being communicated with the oil return cavity 6 to being communicated with the oil inlet cavity 5 in a short time, and the pressure detected by the pressure sensor 10 can generate a pressure mutation phenomenon, so that the control device adjusts the flow of the oil cylinder according to the flow of the system, and the multistage cylinder is more stable during stage change until the primary piston 7 runs to the extreme position, referring to fig. 5. Conversely, the same is true for the piston rod when 3 is retracted.
Compared with the original mode of buffering at the tail end and outputting an induction signal when the tail end is formed to the bottom, the multistage oil cylinder provided by the invention has the characteristics of avoiding pressure rise and feedback lag caused by the conventional oil trapping at the tail end of a stroke.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.
Claims (4)
1. The multistage oil cylinder comprises an outer cylinder barrel, at least one middle cylinder barrel and a piston rod, wherein a piston assembly is arranged on the piston rod and separates an oil inlet cavity and an oil return cavity from the outer cylinder barrel, the multistage oil cylinder is characterized in that the piston assembly comprises a primary piston and at least one secondary piston, the primary piston is connected with the middle cylinder barrel at the first stage, a detection oil hole is arranged on the outer cylinder barrel, a pressure sensor is connected to the detection oil hole, a seal ring is sealed between the primary piston and the inner wall of the outer cylinder barrel, when the primary piston is positioned at the left side of the detection oil hole, the detection oil hole is communicated with the oil return cavity, when the primary piston is positioned at the right side of the detection oil hole, the detection oil hole is communicated with the oil inlet cavity, the primary piston is communicated with the oil inlet cavity through the detection oil hole, or is communicated with the oil inlet cavity through the detection oil inlet cavity, the pressure mutation is detected by the pressure sensor to determine the regional position of the primary piston in the outer cylinder barrel, the seal ring is arranged on the seal ring, when the left side of the detection oil hole is positioned at the detection oil hole, the detection oil hole is communicated with the middle cylinder barrel, the oil return cavity is communicated with the oil inlet cavity through the detection oil hole, the detection oil hole is communicated with the oil cavity through the detection oil hole, the detection oil hole is communicated with the oil cavity through the oil hole through the detection hole, the sealing ring is opened, and the oil cylinder barrel is communicated with the oil cavity through the detection hole, the secondary piston is arranged outside the middle cylinder barrel through a corresponding secondary detection oil hole, and the secondary detection oil hole is communicated with the detection oil hole.
2. The multistage oil cylinder according to claim 1, wherein the detection oil hole is located at the right end of the outer cylinder, and a gap is provided between the detection oil hole and the seal ring when the primary piston is extended to a maximum distance.
3. The multistage oil cylinder according to any one of claims 1-2, wherein the pressure sensor is connected with a control device for adjusting the flow rate of the system.
4. The multistage oil cylinder according to claim 1, wherein the detection oil hole is a stepped detection oil hole having a larger diameter at a mouth than at a bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910211814.2A CN109869372B (en) | 2019-03-20 | 2019-03-20 | Multi-stage oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910211814.2A CN109869372B (en) | 2019-03-20 | 2019-03-20 | Multi-stage oil cylinder |
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| Publication Number | Publication Date |
|---|---|
| CN109869372A CN109869372A (en) | 2019-06-11 |
| CN109869372B true CN109869372B (en) | 2024-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910211814.2A Active CN109869372B (en) | 2019-03-20 | 2019-03-20 | Multi-stage oil cylinder |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2708794A1 (en) * | 1977-03-01 | 1978-09-07 | Schott Gmbh & Co Kg | Limit switch for cylinder and piston under pressure - has actuator rod penetrating front wall into socket in field of coil |
| DE4201464A1 (en) * | 1992-01-21 | 1993-07-22 | Festo Kg | Controlled damping for end stops of damping cylinder - having sensors to monitor piston travel and with programmed damping control |
| JPH11217191A (en) * | 1998-02-02 | 1999-08-10 | Sumitomo Constr Mach Co Ltd | Telescope-type multistage boom expanding and contracting device |
| DE29811413U1 (en) * | 1998-06-25 | 1999-08-26 | Bison Stematec Maschinenbau Un | Multi-stage, double-acting hydraulic cylinder with hydraulic arrangement, especially for lifting work systems |
| CN2665430Y (en) * | 2003-11-28 | 2004-12-22 | 三一重工股份有限公司 | Hydraulic oil cylinder with pressure differential triggering changing-over control structure |
| DE102007010115A1 (en) * | 2007-02-28 | 2008-09-04 | Robert Bosch Gmbh | Pneumatic drive for automation engineering applications, has electronic evaluation unit determining speed and/or acceleration of piston and diagnostic information for operating condition control by analysis of flow of binary signals |
| CN201433955Y (en) * | 2009-06-14 | 2010-03-31 | 杨雁征 | Hydraulic oil cylinder |
| CN101749301A (en) * | 2008-12-18 | 2010-06-23 | 中集车辆（集团）有限公司 | Hydraulic cylinder device and hydraulic cylinder behavior control system with same |
| CN209704979U (en) * | 2019-03-20 | 2019-11-29 | 江苏恒立液压股份有限公司 | Multi-stage oil cylinder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010037689A1 (en) * | 2000-03-08 | 2001-11-08 | Krouth Terrance F. | Hydraulic actuator piston measurement apparatus and method |
-
2019
- 2019-03-20 CN CN201910211814.2A patent/CN109869372B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2708794A1 (en) * | 1977-03-01 | 1978-09-07 | Schott Gmbh & Co Kg | Limit switch for cylinder and piston under pressure - has actuator rod penetrating front wall into socket in field of coil |
| DE4201464A1 (en) * | 1992-01-21 | 1993-07-22 | Festo Kg | Controlled damping for end stops of damping cylinder - having sensors to monitor piston travel and with programmed damping control |
| JPH11217191A (en) * | 1998-02-02 | 1999-08-10 | Sumitomo Constr Mach Co Ltd | Telescope-type multistage boom expanding and contracting device |
| DE29811413U1 (en) * | 1998-06-25 | 1999-08-26 | Bison Stematec Maschinenbau Un | Multi-stage, double-acting hydraulic cylinder with hydraulic arrangement, especially for lifting work systems |
| CN2665430Y (en) * | 2003-11-28 | 2004-12-22 | 三一重工股份有限公司 | Hydraulic oil cylinder with pressure differential triggering changing-over control structure |
| DE102007010115A1 (en) * | 2007-02-28 | 2008-09-04 | Robert Bosch Gmbh | Pneumatic drive for automation engineering applications, has electronic evaluation unit determining speed and/or acceleration of piston and diagnostic information for operating condition control by analysis of flow of binary signals |
| CN101749301A (en) * | 2008-12-18 | 2010-06-23 | 中集车辆（集团）有限公司 | Hydraulic cylinder device and hydraulic cylinder behavior control system with same |
| CN201433955Y (en) * | 2009-06-14 | 2010-03-31 | 杨雁征 | Hydraulic oil cylinder |
| CN209704979U (en) * | 2019-03-20 | 2019-11-29 | 江苏恒立液压股份有限公司 | Multi-stage oil cylinder |
Non-Patent Citations (1)
| Title |
|---|
| 活塞杆实心制式双作用多级液压缸的设计;沈姝君;董勇;;液压与气动;20130515(第05期);全文 * |
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| CN109869372A (en) | 2019-06-11 |
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