CN203297188U - Constant pressure oil cylinder - Google Patents
Constant pressure oil cylinder Download PDFInfo
- Publication number
- CN203297188U CN203297188U CN2013203113271U CN201320311327U CN203297188U CN 203297188 U CN203297188 U CN 203297188U CN 2013203113271 U CN2013203113271 U CN 2013203113271U CN 201320311327 U CN201320311327 U CN 201320311327U CN 203297188 U CN203297188 U CN 203297188U
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- piston
- cylinder barrel
- air cavity
- guide rod
- pressure oil
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Abstract
The utility model relates to the technical field of hydraulic transmission, in particular to a constant pressure oil cylinder. The constant pressure oil cylinder comprises a cylinder barrel, an upper cylinder barrel cover and a lower cylinder barrel cover, wherein the upper cylinder barrel cover and the lower cylinder barrel cover are in sealing connection with the cylinder barrel, a piston is installed in the cylinder barrel in a sliding mode, the piston is fixedly connected with a piston rod, the piston rod penetrates through the upper cylinder barrel cover, an axially-extending air cavity is formed in the piston rod, a piston guide rod is fixedly installed on the lower cylinder barrel cover, the piston guide rod is provided with an axially-extending airflow channel, the piston guide rod and the piston rod are coaxially arranged, one end of the piston guide rod is extended out of the lower cylinder barrel cover, the other end of the piston guide rod is inserted in the air cavity, and the air cavity is connected with a power air source through a connecting pipe. According to the constant pressure oil cylinder, the stable backpressure is provided when the piston goes down, and the impact of the piston on the oil cylinder is reduced. When the piston goes up, the stable rising assistance effect is provided for the piston, the needed hydraulic oil motive power is reduced, the needed hydraulic oil motive power can be provided through a motor, the fossil energy like petroleum can be replaced by electric energy, the cost is reduced, and the environmental pollution is reduced.
Description
Technical field
The utility model relates to hydraulic transmission technology field, relates in particular to a kind of constant pressure oil cylinder.
Background technique
Hydraulic transmission is to using liquid as driving medium, to realize a kind of type of belt drive of energy transmission and control.The hydraulic transmission process is to utilize oil hydraulic pump the mechanical energy of prime mover to be converted to the pressure energy of liquid, variation by the fluid pressure energy carrys out transferring energy, transmission and control through various control valves and pipeline, by means of hydraulic actuator, can be converted to mechanical energy to fluid pressure, thereby drive operation mechanism, realize straight reciprocating motion and rotation motion.Hydraulic transmission, with the incomparable advantage of other kind of drive, is widely used in the aspects such as lathe, automobile, aircraft, boats and ships, engineering machinery, plastics machinery, test machines, metallurgical machinery and mining machinery.
Oil cylinder is oil hydraulic cylinder, is a hydraulicdriven critical elements, and function is to convert hydraulic energy to mechanical energy.Oil hydraulic cylinder is comprised of cylinder barrel and cylinder cap, piston and piston rod, seal arrangement, damping device and venting gas appliance basically.Damping device and venting gas appliance depending on concrete application, other devices are essential.
The tradition oil cylinder is to realize what energy transmitted by the fluid that passes into different pressures to two seal containers respectively, and as shown in Figure 1, traditional heavy-duty oil cylinder divides the first shoe cream room 6,7 liang of chambeies of the second shoe cream room.During work, the left position of three-position four-way valve 17 is connected, and high pressure oil first leads to the second shoe cream room 7, and piston 4 is pushed protruding, and the acting of jack-up weight, be that hydraulic energy transfer is the mechanical energy of load; The right position of three-position four-way valve 17 is connected, the fluid commutation, and oil cylinder the first shoe cream room 6 is high pressure oil, under the effect of high pressure oil and bearing load gravity, piston 4 bounces back fast, and oil cylinder is had to a huge percussion, oil cylinder is produced to destruction, affect the working life of oil cylinder.
The model utility content
The purpose of this utility model is to provide a kind of constant pressure oil cylinder, is intended to solve the constant pressure oil cylinder of prior art in the technical problem of the quick retraction of piston to the working life of oil cylinder generation enormous impact function influence oil cylinder.
the utility model is to realize like this, constant pressure oil cylinder comprises cylinder barrel, the cylinder barrel upper cover and the cylinder barrel lower cover that are tightly connected with described cylinder barrel, in described cylinder barrel, be slidably fitted with piston, described piston is fixedly connected with piston rod, described piston rod passes described cylinder barrel upper cover, in described piston rod, be provided with axially extended air cavity, under described cylinder barrel, cover and be installed with piston guide rod, described piston guide rod has axially extended air-flow path, described piston guide rod and piston rod coaxially arrange, described piston guide rod one end stretches out described cylinder barrel lower cover, the other end stretches into described air cavity, described air cavity connects power gas source by connecting pipeline.
As a kind of improvement, in parallelly between described air cavity and power gas source be provided with two and flow to opposite one-way valve, the one-way valve that described air cavity flows to described power gas source connects a relief valve.
As improving further, on described cylinder barrel, cover the piston limit structure that is provided with the described piston range of upward movement of restriction.
As further improving, described piston limit structure comprises and is fixedly mounted on the piston limit cover that covers on described cylinder barrel, and described piston limit cover is positioned at described cylinder barrel.
owing to adopting technique scheme, the beneficial effects of the utility model are: owing in piston rod, being provided with air cavity, and connect power gas source by the air-flow path of piston guide rod, when piston descends under load gravity and hydraulic oil effect, piston guide rod gos deep in air cavity, the air cavity smaller volume, gas pressure intensity wherein increases, gas enters into power gas source, it is constant that the air cavity internal air pressure changes very little basic maintenance, to the piston that descends, provide stable back pressure, slow down the impact of the piston of fast-descending to oil cylinder, the destruction of reduction to oil cylinder, extended the working life of oil cylinder, after the loading arm loading, the second shoe cream room input high pressure oil, pushing piston rises under the effect of the gentle intracavity gas pressure of high pressure oil, the air cavity volume enlarges pressure and reduces, power gas source discharges the portion gas of savings in air cavity, make the air pressure in air cavity keep substantially constant, piston is applied to upwards thrust, reduce the input power of required high pressure oil, by setting suitable atmospheric pressure value, can utilize motor that the input power of hydraulic oil is provided, thereby replace diesel engine and save petroleum resources, alleviate simultaneously environmental pollution.
Due in parallel between air cavity and power gas source, be provided with two and flow to opposite one-way valve, the one-way valve that air cavity flows to power gas source connects a relief valve, only have when the gas pressure intensity in air cavity reaches setting numerical value and relief valve could be opened and flowed to power gas source, and only needing very little power just can open one-way valve, the gas in power gas source discharges gas to air cavity, make the pressure substantially constant in air cavity, steady power-assisted effect is provided in the piston uphill process, when piston descends, play steady buffer function, prevent the hydraulic circuit disturbance.
Owing on cylinder barrel, covering, be provided with the piston limit cover, while making piston rise to upper limit position, keep contacting with the sealing of piston guide rod, prevent the Leakage Gas in air cavity.
The accompanying drawing explanation
Fig. 1 is the structural representation of prior art oil cylinder;
Fig. 2 is the utility model embodiment's structural representation;
Wherein: 1-cylinder barrel, 2-cylinder barrel upper cover, 3-cylinder barrel lower cover, the 4-piston, 5-piston rod, 6-the first shoe cream room, 7-the second shoe cream room, 8-oil transportation mouth, 9-air cavity, the 10-piston guide rod, 101-air-flow path, 11-connecting pipeline, the 12-power gas source, 13-relief valve, 14-the first one-way valve, 15-the second one-way valve, 16-piston limit cover, 17-three-position four-way valve.
Embodiment
In order to make the purpose of this utility model, technological scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
as shown in Figure 2, constant pressure oil cylinder comprises cylinder barrel 1, the cylinder barrel upper cover 2 and the cylinder barrel lower cover 3 that are tightly connected with cylinder barrel 1, in cylinder barrel 1, be slidably fitted with piston 4, piston 4 is fixedly connected with piston rod 5, piston rod 5 passes cylinder barrel upper cover 2, piston 4 is divided into the first shoe cream room 6 and the second shoe cream room 7 by cylinder barrel 1, the first shoe cream room 6 and the second shoe cream room 7 are equipped with oil transportation mouth 8, in piston rod 5, be provided with axially extended air cavity 9, on cylinder barrel lower cover 3, be installed with piston guide rod 10, piston guide rod 10 has axially extended air-flow path 101, piston guide rod 10 coaxially arranges with piston rod 5, piston guide rod 10 1 ends stretch out cylinder barrel lower cover 3, the other end stretches into air cavity 9, air cavity 9 connects power gas source 12 by connecting pipeline 11, wherein, power gas source 12 is specifically as follows the gas holder of a connection air compressor, perhaps other are equipped with the energy storage apparatus of gas compression pump, in actual the use, in air cavity 9, be filled with the gas that chemical property is more stable, as nitrogen or other inert gases, because producing of nitrogen supplied conveniently, at this, use nitrogen.
in the present embodiment, as shown in Figure 2, in parallelly between air cavity 9 and power gas source 12 be provided with two and flow to opposite one-way valve, the one-way valve that air cavity 9 flows to power gas source 12 connects a relief valve 13, be specially and be respectively the first one-way valve 14 and the second one-way valve 15, the first one-way valve 14 is connected with relief valve 13, when entering into air cavity 9, nitrogen driven force source of the gas 12 with very little power, can open the second one-way valve 15 when interior, only have when the air pressure in air cavity 9 arrives setting value and relief valve 13 and the first one-way valve 14 could be opened, nitrogen enters into power gas source 12, keep the air pressure in air cavity 9 constant, active force to piston rod 5 is constant, steady power-assisted effect is provided in piston 4 uphill process, when descending, plays in piston 4 steady buffer function.
in the present embodiment, cylinder barrel upper cover 2 bottom surfaces are provided with the piston limit structure that limits piston 4 range of upward movement, specifically be set to be fixed on the bottom surface of cylinder barrel upper cover 2 and the annular piston stop collar 16 of cylinder barrel upper cover 2 integrative-structures, can also be arranged on other the spacing barrier structures on piston 4 or cylinder barrel 1, while making piston 4 rise to upper limit position, keep contacting with the sealing of piston guide rod 10, prevent that air cavity 9 from communicating with the second shoe cream room 7, the length of all right proper extension piston guide rod 10, even make in the situation that piston limit structure piston 4 is not set rises to upper limit position and also can not break away from piston guide rod 10.
in order to understand better the technical solution of the utility model, below simply introduce working principle of the present utility model: the nitrogen that pours setting pressure in power gas source 12, because power gas source 12 communicates with air cavity 9, in air cavity 9, also be full of the nitrogen of setting pressure, the thrust that makes progress to piston rod 5 generations, when the right position of three-position four-way valve 17 is connected, the first shoe cream room 6 is high pressure oil, be unloaded this moment, under high pressure oil and load bearing arm Action of Gravity Field, piston 4 descends, air cavity 9 volume-diminished, air pressure increases, gas in air cavity 9 flows in power gas source 12 by relief valve 13 and the first one-way valve 14, make the air pressure in air cavity 9 constant, nitrogen in air cavity 9 provides stable back pressure to piston rod 5, slowed down the rate of descent of piston 4, avoid the severe impact of 4 pairs of oil cylinders of piston, extended the working life of oil cylinder, after the loading arm loading, the three-position four-way valve 17 left positions of commutation are connected, the second shoe cream room 7 is high pressure oil, piston 4 and piston rod 5 are subject to the thrust that makes progress of the interior gas of air cavity 9 and high pressure oil, ascending motion, air cavity 9 volumes become large, in nitrogen driven force source of the gas 12, overcome very little power and open the second one-way valve 15 to the interior release nitrogen of air cavity 9, keep the stable gas pressure in air cavity 9, piston rod 5 is provided and stablizes the rising power-assisted, reduced required high pressure oil motive force, can provide required hydraulic oil motive force by motor, with electric energy, replace the fossil energies such as oil, reduce costs, environmental contamination reduction.
The utility model provides stable back pressure when piston 4 descends, slow down the impact of 4 pairs of oil cylinders of piston, when piston 4 rises, to piston 4, provide the power-assisted effect of rising stably, reduce required high pressure oil motive force, can provide required hydraulic oil motive force by motor, with electric energy, replaced the fossil energies such as oil, reduce costs environmental contamination reduction.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (4)
1. constant pressure oil cylinder, comprise cylinder barrel, the cylinder barrel upper cover and the cylinder barrel lower cover that are tightly connected with described cylinder barrel, in described cylinder barrel, be slidably fitted with piston, described piston is fixedly connected with piston rod, described piston rod passes described cylinder barrel upper cover, it is characterized in that, in described piston rod, be provided with axially extended air cavity, under described cylinder barrel, cover and be installed with piston guide rod, described piston guide rod has axially extended air-flow path, described piston guide rod and piston rod coaxially arrange, described piston guide rod one end stretches out described cylinder barrel lower cover, the other end stretches into described air cavity, described air cavity connects power gas source by connecting pipeline.
2. constant pressure oil cylinder according to claim 1, is characterized in that, in parallelly between described air cavity and power gas source is provided with two and flows to opposite one-way valve, and the one-way valve that described air cavity flows to described power gas source connects a relief valve.
3. constant pressure oil cylinder according to claim 2, is characterized in that, on described cylinder barrel, covers and be provided with the piston limit structure that limits described piston range of upward movement.
4. constant pressure oil cylinder according to claim 3, is characterized in that, described piston limit structure comprises and be fixedly mounted on the piston limit cover that covers on described cylinder barrel, and described piston limit cover is positioned at described cylinder barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203113271U CN203297188U (en) | 2013-05-31 | 2013-05-31 | Constant pressure oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203113271U CN203297188U (en) | 2013-05-31 | 2013-05-31 | Constant pressure oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203297188U true CN203297188U (en) | 2013-11-20 |
Family
ID=49573198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203113271U Expired - Fee Related CN203297188U (en) | 2013-05-31 | 2013-05-31 | Constant pressure oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203297188U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267041A (en) * | 2013-05-31 | 2013-08-28 | 潍坊亿宏重工机械有限公司 | Constant pressure oil cylinder |
| CN109538559A (en) * | 2018-12-11 | 2019-03-29 | 山东交通学院 | The shield excavation machine propulsion system that the symmetrical hydraulic cylinder of single-piston rod is connected in series |
| CN114352604A (en) * | 2022-01-13 | 2022-04-15 | 四川鼎鸿智电装备科技有限公司 | Efficient energy-saving oil cylinder and engineering equipment |
-
2013
- 2013-05-31 CN CN2013203113271U patent/CN203297188U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267041A (en) * | 2013-05-31 | 2013-08-28 | 潍坊亿宏重工机械有限公司 | Constant pressure oil cylinder |
| CN103267041B (en) * | 2013-05-31 | 2016-02-03 | 潍坊亿宏重工机械有限公司 | Constant pressure oil cylinder |
| CN109538559A (en) * | 2018-12-11 | 2019-03-29 | 山东交通学院 | The shield excavation machine propulsion system that the symmetrical hydraulic cylinder of single-piston rod is connected in series |
| CN114352604A (en) * | 2022-01-13 | 2022-04-15 | 四川鼎鸿智电装备科技有限公司 | Efficient energy-saving oil cylinder and engineering equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131120 |