CN103423220A - Hydraulic system for controlling telescopic arms - Google Patents
Hydraulic system for controlling telescopic arms Download PDFInfo
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- CN103423220A CN103423220A CN2012101645315A CN201210164531A CN103423220A CN 103423220 A CN103423220 A CN 103423220A CN 2012101645315 A CN2012101645315 A CN 2012101645315A CN 201210164531 A CN201210164531 A CN 201210164531A CN 103423220 A CN103423220 A CN 103423220A
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- telescopic
- oil
- hydraulic system
- controlling
- oil cylinder
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Abstract
The invention discloses a hydraulic system for controlling telescopic arms. The hydraulic system for controlling the telescopic arms comprises a hydraulic pump, telescopic oil cylinders and a hydraulic change-over valve connected with the hydraulic pump, the hydraulic change-over valve is connected with rod cavities of the telescopic oil cylinders through a first oil circuit and connected with rodless cavities of the telescopic oil cylinders trough a second oil circuit, the second oil circuit is provided with an oil return pipeline leading to an oil tank, and a first cartridge valve is arranged on the oil return pipeline. Due to the arrangement, the hydraulic system for controlling the telescopic arms has the advantage that the problems of low retraction speed of the telescopic arms and proneness to large vibration due to small diameter of a hydraulic change-over valve in the prior art can be effectively avoided.
Description
Technical field
The present invention relates to technical field of engineering machinery, relate to more specifically a kind of hydraulic system of controlling telescopic boom.
Background technique
Along with the development of China's economic construction, engineering machinery field has obtained constantly brings forth new ideas and progress.In the evolution of engineering machinery, energy-efficient its development trend that become.Following content will describe in detail to a kind of hoist of the prior art.
At present, the demand of building in order to adapt to large-scale engineering, the shear leg of hoist need be assembled by multistage telescopic arm.In the using process of current known large-tonnage telescopic boom crawler crane, because the multi-stage telescopic arms weight stroke large, telescopic cylinder of hoist is longer, and higher to the telescopic boom rate request, therefore on-the-spot having relatively high expectations to the telescopic cylinder flow.
Yet the area of telescopic oil cylinder rodless cavity and the area of rod chamber differ larger, during the retraction of telescopic boom of the prior art, usually by the hydraulicchange-over valve oil return of hydraulic system.Due to the restriction that is subject to hydraulic power, the latus rectum of hydraulicchange-over valve is less, uses in the large-tonnage hoist, and the retraction speed of telescopic boom is very slow, and can cause very large back pressure in oil circuit, makes telescopic boom produce larger shake, and then causes unsafe hidden danger.
Therefore, how to avoid because the hydraulicchange-over valve latus rectum is less, and the telescopic boom retraction speed caused is slow and the easy problem that produces larger vibration, becomes those skilled in the art's important technological problems to be solved.
Summary of the invention
The invention provides a kind of hydraulic system of controlling telescopic boom, it can effectively avoid prior art China because the hydraulicchange-over valve latus rectum is less, and the telescopic boom retraction speed caused is slow and the easy problem that produces larger vibration.
A kind of hydraulic system of controlling telescopic boom provided by the invention, comprise oil hydraulic pump, telescopic oil cylinder and the hydraulicchange-over valve be connected with described oil hydraulic pump, described hydraulicchange-over valve is connected with the rod chamber of described telescopic oil cylinder by the first oil circuit, by the second oil circuit, with the rodless cavity of described telescopic oil cylinder, be connected, described the second oil circuit is provided with the return line that leads to fuel tank, and described return line is provided with the first cartridge valve.
Preferably, also comprise the valving opened and closed for controlling described the first cartridge valve.
Preferably, described valving is solenoid directional control valve.
Preferably, described valving is hydraulicchange-over valve.
Preferably, described telescopic oil cylinder is two, and described the second oil circuit comprises the main line and the first branch road be connected with described main line and the second branch road be connected with described hydraulicchange-over valve, described the first branch road is connected with the rodless cavity of a described telescopic oil cylinder, and described the second branch road is connected with the rodless cavity of another described telescopic oil cylinder; Described the first branch road is provided with the second cartridge valve, and described the second branch road is provided with the 3rd cartridge valve; Described return line is connected with described main line.
A kind of hydraulic system of controlling telescopic boom provided by the invention, comprise oil hydraulic pump, telescopic oil cylinder and the hydraulicchange-over valve be connected with described oil hydraulic pump, described hydraulicchange-over valve is connected with the rod chamber of described telescopic oil cylinder by the first oil circuit, by the second oil circuit, with the rodless cavity of described telescopic oil cylinder, be connected, described the second oil circuit is provided with the return line that leads to fuel tank, and described return line is provided with the first cartridge valve.So arrange, when the flexible rod of telescopic oil cylinder stretches out, hydraulicchange-over valve can be controlled the second oil circuit and be connected with oil hydraulic pump, the first oil circuit is connected with fuel tank, and now, the first cartridge valve is in cut-off state, pressure oil can enter rodless cavity and then promote flexible rod by the second oil circuit and stretch out.And, when the flexible rod of telescopic oil cylinder need to be retracted, the first oil circuit is connected with oil hydraulic pump, the second oil circuit is connected with fuel tank, and now, the first cartridge valve is on state.The latus rectum that should be appreciated that cartridge valve is larger, and then makes by the hydraulic fluid flow rate of the first cartridge valve larger.Therefore, when oil hydraulic pump is oily to the rod chamber incoming pressure of telescopic oil cylinder by the first oil circuit, the hydraulic oil in the rodless cavity of telescopic oil cylinder can flow back in fuel tank by return line and the first cartridge valve rapidly.Obviously, hydraulic system provided by the invention, it can effectively avoid prior art China because the hydraulicchange-over valve latus rectum is less, and the telescopic boom retraction speed caused is slow and the easy problem that produces larger vibration.
The accompanying drawing explanation
Fig. 1 controls the hydraulic system structure schematic diagram of telescopic boom in the specific embodiment of the invention.
Embodiment
The invention provides a kind of hydraulic system of controlling telescopic boom, it can effectively avoid prior art China because the hydraulicchange-over valve latus rectum is less, and the telescopic boom retraction speed caused is slow and the easy problem that produces larger vibration.
Below in conjunction with specific embodiments of the invention and accompanying drawing, technical solution of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiments.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment who obtains, belong to the scope of protection of the invention.
Please refer to Fig. 1, Fig. 1 controls the hydraulic system structure schematic diagram of telescopic boom in the specific embodiment of the invention.
A kind of hydraulic system of controlling telescopic boom provided in the present embodiment, comprise oil hydraulic pump 11, telescopic oil cylinder 12 and the hydraulicchange-over valve 13 be connected with oil hydraulic pump 11.Wherein, hydraulicchange-over valve 13 is connected with the rod chamber of telescopic oil cylinder 12 by the first oil circuit 14, by the second oil circuit 15, with the rodless cavity of telescopic oil cylinder 12, is connected.
It should be noted that, hydraulic system provided in the present embodiment, its second oil circuit 15 is provided with the return line 17 that leads to fuel tank 16, and return line 17 is provided with the first cartridge valve 18.
So arrange, when the flexible rod of telescopic oil cylinder 12 stretches out, hydraulicchange-over valve 13 can be controlled the second oil circuit 15 and be connected with oil hydraulic pump 11, the first oil circuit 14 is connected with fuel tank, and now, the first cartridge valve 18 is in cut-off state, and pressure oil can enter rodless cavity and then promote flexible rod by the second oil circuit 15 and stretch out.
When the flexible rod of telescopic oil cylinder 12 need to be retracted, the first oil circuit 14 is connected with oil hydraulic pump 11, and the second oil circuit 15 is connected with fuel tank, and now, the first cartridge valve 18 is on state.The latus rectum that should be appreciated that cartridge valve is larger, and then makes by the hydraulic fluid flow rate of the first cartridge valve 18 larger.Therefore, when oil hydraulic pump is oily to the rod chamber incoming pressure of telescopic oil cylinder 12 by the first oil circuit 14, the hydraulic oil in the rodless cavity of telescopic oil cylinder 12 can flow back in fuel tank 16 by return line 17 and the first cartridge valve 18 rapidly.
Obviously, hydraulic system provided in the present embodiment, it can effectively avoid prior art China because the hydraulicchange-over valve latus rectum is less, and the telescopic boom retraction speed caused is slow and the easy problem that produces larger vibration.
For cut-off and the conducting that realizes easily the first cartridge valve 18, hydraulic system provided in the present embodiment also can comprise the valving 19 opened and closed for controlling the first cartridge valve 18.
So arrange, realize cut-off or the conducting of the first cartridge valve 18 by the action of valving 19, effectively improved the cut-off of controlling the first cartridge valve 18 or the operability of conducting.
It should be noted that, valving 19 provided in the present embodiment can be specially solenoid valve, certainly, also can be the valve of other type, such as pneumatic valve, hydraulic operated valve etc., only needs cut-off or the conducting that can effectively control the first cartridge valve 18 to get final product.
In addition, it should be noted that, hydraulic system provided in the present embodiment, it can specifically be applied to control has in the telescopic boom of two telescopic oil cylinders, and its concrete set-up mode can be as described in following.
It should be noted that, the first branch road 152 is provided with the second cartridge valve 154, the second branch roads 153 and is provided with the 3rd cartridge valve 155; Return line 17 is connected with main line 151.
So arrange, when the telescopic oil cylinder be connected with the first branch road 152 moves, the second cartridge valve 154 on the first branch road 152 is on state, and the 3rd cartridge valve 155 on the second branch road 153 is in cut-off state; In like manner, when the telescopic oil cylinder be connected with the second branch road 153 moves, the 3rd cartridge valve 155 on the second branch road 153 is on state, and the second cartridge valve 154 on the first branch road 152 is in cut-off state.And when the flexible rod of the telescopic oil cylinder be connected with the first branch road 152 is bounced back, or when the telescopic oil cylinder be connected with the second branch road 153 is bounced back, hydraulic oil in its rodless cavity all can flow back to rapidly fuel tank by return line 17 and the first cartridge valve 18, and then reaches the purpose of quick retraction.
Certainly, according to set-up mode provided in the present embodiment, also can realize the control of more telescopic oil cylinders, such as, three telescopic oil cylinders, four telescopic oil cylinders etc., the set-up mode of its concrete set-up mode and two telescopic oil cylinders is substantially similar, therefore this paper repeats no more.
Above a kind of hydraulic system of controlling telescopic boom provided by the present invention is described in detail, applied specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (5)
1. a hydraulic system of controlling telescopic boom, comprise oil hydraulic pump, telescopic oil cylinder and the hydraulicchange-over valve be connected with described oil hydraulic pump, described hydraulicchange-over valve is connected with the rod chamber of described telescopic oil cylinder by the first oil circuit, by the second oil circuit, with the rodless cavity of described telescopic oil cylinder, be connected, it is characterized in that, described the second oil circuit is provided with the return line that leads to fuel tank, and described return line is provided with the first cartridge valve.
2. a kind of hydraulic system of controlling telescopic boom as claimed in claim 1, is characterized in that, also comprises the valving opened and closed for controlling described the first cartridge valve.
3. a kind of hydraulic system of controlling telescopic boom as claimed in claim 2, is characterized in that, described valving is solenoid directional control valve.
4. a kind of hydraulic system of controlling telescopic boom as claimed in claim 2, is characterized in that, described valving is hydraulicchange-over valve.
5. a kind of hydraulic system of controlling telescopic boom as claimed in claim 1, it is characterized in that, described telescopic oil cylinder is two, and described the second oil circuit comprises the main line and the first branch road be connected with described main line and the second branch road be connected with described hydraulicchange-over valve, described the first branch road is connected with the rodless cavity of a described telescopic oil cylinder, and described the second branch road is connected with the rodless cavity of another described telescopic oil cylinder; Described the first branch road is provided with the second cartridge valve, and described the second branch road is provided with the 3rd cartridge valve; Described return line is connected with described main line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101645315A CN103423220A (en) | 2012-05-24 | 2012-05-24 | Hydraulic system for controlling telescopic arms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101645315A CN103423220A (en) | 2012-05-24 | 2012-05-24 | Hydraulic system for controlling telescopic arms |
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| CN103423220A true CN103423220A (en) | 2013-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012101645315A Pending CN103423220A (en) | 2012-05-24 | 2012-05-24 | Hydraulic system for controlling telescopic arms |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107477036A (en) * | 2017-08-10 | 2017-12-15 | 北汽福田汽车股份有限公司 | The hydraulic control system of telescoping mechanism and there is its vehicle |
| CN112756648A (en) * | 2021-01-01 | 2021-05-07 | 王兴宾 | Pneumatic control hydraulic lifting multi-hole drilling machine |
Citations (6)
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| CN2448973Y (en) * | 2000-07-12 | 2001-09-19 | 武汉三联水电控制设备公司 | Bidirection controller for hydraulic oil cylinder |
| JP2001315177A (en) * | 2000-05-10 | 2001-11-13 | Meiki Co Ltd | Clamping hydraulic apparatus for injection holding machine |
| US6370874B1 (en) * | 1997-08-11 | 2002-04-16 | Mannesmann Rexroth Ag | Hydraulic control device for a mobile machine, especially for a wheel loader |
| CN2629952Y (en) * | 2003-03-17 | 2004-08-04 | 宁波海天股份有限公司 | Hydraulic safety circuit for injection mouldnig machine |
| CN201346841Y (en) * | 2008-12-18 | 2009-11-18 | 宁波海天重工机械有限公司 | Hydraulic insurance circuit of large injection molding machine |
| CN201856367U (en) * | 2010-11-14 | 2011-06-08 | 海天塑机集团有限公司 | Injection molding machine preplasticizing back pressure control loop |
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2012
- 2012-05-24 CN CN2012101645315A patent/CN103423220A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6370874B1 (en) * | 1997-08-11 | 2002-04-16 | Mannesmann Rexroth Ag | Hydraulic control device for a mobile machine, especially for a wheel loader |
| JP2001315177A (en) * | 2000-05-10 | 2001-11-13 | Meiki Co Ltd | Clamping hydraulic apparatus for injection holding machine |
| CN2448973Y (en) * | 2000-07-12 | 2001-09-19 | 武汉三联水电控制设备公司 | Bidirection controller for hydraulic oil cylinder |
| CN2629952Y (en) * | 2003-03-17 | 2004-08-04 | 宁波海天股份有限公司 | Hydraulic safety circuit for injection mouldnig machine |
| CN201346841Y (en) * | 2008-12-18 | 2009-11-18 | 宁波海天重工机械有限公司 | Hydraulic insurance circuit of large injection molding machine |
| CN201856367U (en) * | 2010-11-14 | 2011-06-08 | 海天塑机集团有限公司 | Injection molding machine preplasticizing back pressure control loop |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107477036A (en) * | 2017-08-10 | 2017-12-15 | 北汽福田汽车股份有限公司 | The hydraulic control system of telescoping mechanism and there is its vehicle |
| CN107477036B (en) * | 2017-08-10 | 2019-04-23 | 北汽福田汽车股份有限公司 | The hydraulic control system of telescoping mechanism and vehicle with it |
| CN112756648A (en) * | 2021-01-01 | 2021-05-07 | 王兴宾 | Pneumatic control hydraulic lifting multi-hole drilling machine |
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Application publication date: 20131204 |