CN102966132A - Swing arm descending control loop of hydraulic excavator - Google Patents
Swing arm descending control loop of hydraulic excavator Download PDFInfo
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- CN102966132A CN102966132A CN2012105123899A CN201210512389A CN102966132A CN 102966132 A CN102966132 A CN 102966132A CN 2012105123899 A CN2012105123899 A CN 2012105123899A CN 201210512389 A CN201210512389 A CN 201210512389A CN 102966132 A CN102966132 A CN 102966132A
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- swing arm
- control valve
- oil
- regeneration
- control
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Abstract
The invention discloses a swing arm descending control loop of a hydraulic excavator. A swing arm first control valve is provided with a regeneration channel; a CT orifice of a swing arm second control valve is provided with a throttle orifice, so that swing arm oil return generates back pressure; a flow regeneration control valve is arranged between a swing arm descending pilot valve oil path and the swing arm first control valve and used for automatically controlling the on/off of a pilot signal of the swing arm first control valve; and the pilot signal of the flow regeneration control valve is derived from a swing arm rod cavity and can automatically realize complete regeneration and regeneration removal of flow quantity according to the change condition of load. In the swing arm descending process and under the action of the swing arm and the load gravity, one part of oil, which originally reflows to an oil tank, of a swing arm rodless cavity reflows to the oil tank through the throttle orifice and one part of the oil enters the rod cavity quickly through the regeneration channel of the swing arm first control valve, so that a pump is kept in low-discharge state, the power consumption is reduced, the oil temperature of the system is reduced, and the energy-saving effect is achieved. When a bucket is in contact with the ground or supports a vehicle, the pressure of the rod cavity is increased, the flow regeneration control valve is closed, the swing arm first control valve returns to the middle position, the regeneration channel is closed, and all the oil reflows to the oil tank through the CT throttle orifice of the swing arm second control valve, so the work efficiency is improved.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly a kind of Hydraulic Excavator's Boom control loop for descending.
Background technology
At present, swing arm control loop for descending main control valve mainly is comprised of swing arm the first control valve 2, swing arm the second control valve 4, and its loop comprises swing arm riser circuit, swing arm decline loop, swing arm regenerative circuit.Usually, the oil return of hydraulic cylinder will be returned fuel tank in the hydraulic crawler excavator, if the oil return of hydraulic cylinder only has part to return fuel tank, and the pressure oil of all the other flows and pump output converges, and flows into the oil suction chamber of this hydraulic cylinder, claims that then this loop is regenerative circuit.Common swing arm regeneration is in a swing arm control valve compensation channels to be set, in described compensation channels, one way valve is set, when described swing arm control valve is in the rod chamber fuel feeding, during the working position of rodless cavity oil return, described compensation channels is communicated with interior oil supply gallery and the drainback passage of valve body of reversal valve, so originally, the fluid that flows back to fuel tank enters rapidly rod chamber, plays acceleration, utilizes the effect of self gravitation potential energy, thereby reduce the energy consumption of pump.If if this moment, the hydraulic pressure pump delivery continued to increase, not only can cause energy dissipation, also not bring the harmful effect of system's heating.But this kind regeneration passage because in establish one way valve and so that the control valve complex structure increases cost.
If when swing arm descends, cut off the fuel feeding of pump fully, rely on the swing arm self gravitation to descend to realize Flow-rate adjustment fully, can produce following problem: the one, when swing arm descends when too fast, the oil mass of regeneration is unable to catch up with the speed that swing arm descends far away, can cause the boom cylinder rod chamber to produce negative pressure, cause emptying phenomenon; The 2nd, during the scraper bowl kiss the earth, the action that often also can do swing arm decline realizes supportting the operating mode on car, level land etc., yet no longer carries out the rod chamber fuel feeding that the conversion of potential energy and hydraulic energy reaches boom cylinder this moment, so that the boom cylinder akinesia.
Summary of the invention
The object of the invention is to improve the above-mentioned deficiency that existing Hydraulic Excavator's Boom descends, provide a kind of Hydraulic Excavator's Boom control loop for descending can guarantee that swing arm descends automatically according to the holomorphosis of load realization flow, can under support car state is contacted to earth in assurance, realize the function that flow regeneration automatically terminates again, thereby reach the purpose of efficient energy-saving.
Technical scheme of the present invention is on the basis of present existing system swing arm the first control valve 2 to be used alone as the regeneration passage, realizes flow regeneration.This device comprises swing arm the first control valve, swing arm the second control valve, flow regeneration control valve and one way valve, described swing arm the first control valve is connected with swing arm and is connected with rodless cavity with the rod chamber of oil cylinder respectively behind the oil-out interflow of control valve, the oil circuit that described swing arm the first control valve is connected with the rod chamber of described oil cylinder is connected with the signal end of described flow regeneration control valve, the rod chamber of described swing arm the first control valve and described oil cylinder be connected the oil circuit that the control end of flow regeneration control valve is connected and be provided with one way valve, the control end of described swing arm the first control valve right-hand member be connected the control end of swing arm the second control valve left end and be connected with rising signals, the control end of described swing arm the second control valve right-hand member is connected with dropping signal, and the control end of described swing arm the first control valve left end is connected with described dropping signal by described flow regeneration control valve.
Described swing arm the first control valve is three six pass two-way pilot operated directional control valves.
Described swing arm the second control valve is provided with restriction.
Described flow regeneration control valve is the unidirectional pilot operated directional control valve of 3-position-3-way.
The present invention compared with prior art, the beneficial effect that has is:
1, swing arm the first control valve is used alone as the regeneration passage in swing arm decline process, the regeneration passage need not one way valve, simple in structure, the signal of flow regeneration control valve is taken from the boom cylinder rod chamber, can realize automatically realizing flow holomorphosis and regeneration releasing according to the load variations situation.
2, can realize the holomorphosis of flow, more be conducive to energy-saving cool-down.
3, Regeneration control and the switching that automatically terminates by the flow regeneration control valve realize, the flow regeneration control valve adopts three position three-way control valve, and the stability when having improved the switch operating position plays the effect of buffering transition.
Description of drawings
Fig. 1 is patent Hydraulic Excavator's Boom control loop for descending schematic diagram of the present invention;
The specific embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
This device swing arm the first control valve 2 is provided with the regeneration passage; The CT mouth of described swing arm the second control valve 4 has restriction, makes the swing arm oil return produce back pressure; Be provided with a flow regeneration control valve 1 at swing arm decline pilot valve oil circuits 6 and 2 of swing arm the first control valves, automatically control the break-make of swing arm the first control valve 2 pilot signals, the pilot signal of flow regeneration control valve 1 is taken from boom cylinder 5 rod chambers, can realize automatically realizing flow holomorphosis and regeneration releasing according to the load variations situation.In the process that swing arm descends, because swing arm and load action of gravitation, the fluid part that script boom cylinder 5 rodless cavities flow back to fuel tank flows back to fuel tank by restriction, a part enters rapidly rod chamber by swing arm the first control valve 2 regeneration passages, thereby make pump maintain low displacement condition, reduce power consumption, reduced system's oil temperature, reached energy-saving effect.
When scraper bowl contacted to earth or support car, boom cylinder 5 rod chamber pressure raise, the flow regeneration control valve is closed, and 2 times metas of swing arm the first control valve, the regeneration pathway closure, the CT restriction that the fluid all-pass is crossed swing arm the second control valve 4 flows back to fuel tank, has promoted operating efficiency.
The Hydraulic Excavator's Boom control loop for descending is referring to accompanying drawing 1, and the loop is formed by connecting by flow regeneration control valve 1, swing arm the first control valve 2, one way valve 3, swing arm the second control valve 4, boom cylinder 5, oil sources P1, P2 and pipeline etc.When swing arm descends, boom cylinder 5 rod chamber pressure ratios are lower, flow regeneration control valve 1 is in lower working position under the effect of spring force, swing arm decline pilot pressure is connected by flow regeneration control valve 1 and the first guide cavity of swing arm the first control valve 2, swing arm the first control valve 2 is in the work of left position under the effect of pilot pressure, connect boom cylinder 5 rod chambers, swing arm the second control valve 4 is in the work of right position, so that boom cylinder 5 rodless cavities are connected with fuel tank by swing arm the second control valve 4, rod chamber and P2 connect.Swing arm is transferred by the effect of load and swing arm self gravitation, the fluid part of rodless cavity flows back to fuel tank by the CT restriction of swing arm the second control valve 4, all the other are by the regeneration passage process one way valve 3 of swing arm the first control valve 2, enter boom cylinder 5 rod chambers, realize holomorphosis, this moment, pump was in minimum injection rate, thereby had reduced the calorific value of power consumption and hydraulic system.Because flow regeneration control valve 1 automatic control signal is taken from boom cylinder 5 rod chamber pressure, when dipper touches the end or support car, swing arm rod chamber pressure raises, so that flow regeneration control valve 1 working position automatically switches to upper, thereby cut off the passage of swing arm decline pilot pressure and swing arm the first control valve 2 pilot control ends, and make swing arm pilot control termination lead to fuel tank, thereby so that swing arm the first control valve 2 is got back to meta, hydraulic oil at P2 enters the swing arm rod chamber, under the effect of P2 pressure, swing arm descends, and the fluid of swing arm rodless cavity all advanced the CT restriction and flows back to fuel tank, finish the actions such as support car, improve functioning efficiency.
Claims (4)
1. a Hydraulic Excavator's Boom control loop for descending is characterized in that: comprise swing arm the first control valve (2), swing arm the second control valve (4), flow regeneration control valve (1) and one way valve (3);
Described swing arm the first control valve (2) is connected with swing arm and is connected with rodless cavity with the rod chamber of oil cylinder respectively behind the oil-out interflow of control valve (4), the oil circuit that described swing arm the first control valve (2) is connected with the rod chamber of described oil cylinder is connected with the signal end of described flow regeneration control valve (1), the rod chamber of described swing arm the first control valve (2) and described oil cylinder be connected the oil circuit that the control end of flow regeneration control valve (1) is connected and be provided with one way valve (3), the control end of described swing arm the first control valve (2) right-hand member be connected the control end of swing arm the second control valve (4) left end and be connected with rising signals, the control end of described swing arm the second control valve (4) right-hand member is connected with dropping signal, and the control end of described swing arm the first control valve (2) left end is connected with described dropping signal by described flow regeneration control valve (1).
2. Hydraulic Excavator's Boom control loop for descending according to claim 1, it is characterized in that: described swing arm the first control valve (2) is three six pass two-way pilot operated directional control valves.
3. Hydraulic Excavator's Boom control loop for descending according to claim 1, it is characterized in that: described swing arm the second control valve (4) is provided with restriction.
4. Hydraulic Excavator's Boom control loop for descending according to claim 1, it is characterized in that: described flow regeneration control valve (1) is the unidirectional pilot operated directional control valve of 3-position-3-way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210512389.9A CN102966132B (en) | 2012-12-04 | 2012-12-04 | Swing arm descending control loop of hydraulic excavator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210512389.9A CN102966132B (en) | 2012-12-04 | 2012-12-04 | Swing arm descending control loop of hydraulic excavator |
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| Publication Number | Publication Date |
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| CN102966132A true CN102966132A (en) | 2013-03-13 |
| CN102966132B CN102966132B (en) | 2015-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210512389.9A Active CN102966132B (en) | 2012-12-04 | 2012-12-04 | Swing arm descending control loop of hydraulic excavator |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469847A (en) * | 2013-09-26 | 2013-12-25 | 镇江金天辰新材料有限公司 | Emergency falling system of movable arm of loader |
| CN108104183A (en) * | 2017-12-28 | 2018-06-01 | 潍柴动力股份有限公司 | A kind of hydraulic excavator bucket regenerating unit and hydraulic crawler excavator |
| CN111395425A (en) * | 2020-04-02 | 2020-07-10 | 上海三一重机股份有限公司 | Bucket rod oil cylinder control system and method and excavator |
| CN112983909A (en) * | 2019-12-13 | 2021-06-18 | 山河智能装备股份有限公司 | Movable arm hydraulic system |
| CN114319475A (en) * | 2021-12-31 | 2022-04-12 | 潍柴动力股份有限公司 | Movable arm control valve structure and excavator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08105403A (en) * | 1994-10-05 | 1996-04-23 | Yutani Heavy Ind Ltd | Controller for hydraulic actuator |
| KR20030052534A (en) * | 2001-12-21 | 2003-06-27 | 현대중공업 주식회사 | Arm cylinder flow regeneration control system for excavator |
| CN102588359A (en) * | 2012-02-28 | 2012-07-18 | 上海中联重科桩工机械有限公司 | Hydraulic system, excavator and control method of hydraulic system |
| CN202519717U (en) * | 2012-05-04 | 2012-11-07 | 熔盛机械有限公司 | Energy-saving control system of swing arm descending in positive flow system of excavator |
| CN202945624U (en) * | 2012-12-04 | 2013-05-22 | 山河智能装备股份有限公司 | Boom descending control circuit for hydraulic excavator |
-
2012
- 2012-12-04 CN CN201210512389.9A patent/CN102966132B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08105403A (en) * | 1994-10-05 | 1996-04-23 | Yutani Heavy Ind Ltd | Controller for hydraulic actuator |
| KR20030052534A (en) * | 2001-12-21 | 2003-06-27 | 현대중공업 주식회사 | Arm cylinder flow regeneration control system for excavator |
| CN102588359A (en) * | 2012-02-28 | 2012-07-18 | 上海中联重科桩工机械有限公司 | Hydraulic system, excavator and control method of hydraulic system |
| CN202519717U (en) * | 2012-05-04 | 2012-11-07 | 熔盛机械有限公司 | Energy-saving control system of swing arm descending in positive flow system of excavator |
| CN202945624U (en) * | 2012-12-04 | 2013-05-22 | 山河智能装备股份有限公司 | Boom descending control circuit for hydraulic excavator |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469847A (en) * | 2013-09-26 | 2013-12-25 | 镇江金天辰新材料有限公司 | Emergency falling system of movable arm of loader |
| CN108104183A (en) * | 2017-12-28 | 2018-06-01 | 潍柴动力股份有限公司 | A kind of hydraulic excavator bucket regenerating unit and hydraulic crawler excavator |
| CN108104183B (en) * | 2017-12-28 | 2020-07-28 | 潍柴动力股份有限公司 | Bucket rod regenerating device of hydraulic excavator and hydraulic excavator |
| CN112983909A (en) * | 2019-12-13 | 2021-06-18 | 山河智能装备股份有限公司 | Movable arm hydraulic system |
| CN111395425A (en) * | 2020-04-02 | 2020-07-10 | 上海三一重机股份有限公司 | Bucket rod oil cylinder control system and method and excavator |
| CN114319475A (en) * | 2021-12-31 | 2022-04-12 | 潍柴动力股份有限公司 | Movable arm control valve structure and excavator |
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| Publication number | Publication date |
|---|---|
| CN102966132B (en) | 2015-05-20 |
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