CN202945624U - Boom descending control circuit for hydraulic excavator - Google Patents
Boom descending control circuit for hydraulic excavator Download PDFInfo
- Publication number
- CN202945624U CN202945624U CN 201220658984 CN201220658984U CN202945624U CN 202945624 U CN202945624 U CN 202945624U CN 201220658984 CN201220658984 CN 201220658984 CN 201220658984 U CN201220658984 U CN 201220658984U CN 202945624 U CN202945624 U CN 202945624U
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- Prior art keywords
- control valve
- swing arm
- control
- boom
- valve
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- Withdrawn - After Issue
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- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The utility model discloses a boom descending control circuit for a hydraulic excavator. Oil outlets of a first boom control valve and a second boom control valve are connected with a rod cavity and a rodless cavity of an oil cylinder respectively after confluence; an oil way where the first boom control valve is connected with the rod cavity of the oil cylinder is connected with a signal end of a flow regeneration control valve; a one-way valve is arranged on an oil way where the first boom control valve is connected with the rod cavity of the oil cylinder and a control end of the flow regeneration control valve; a control end at the right end of the first boom control valve and a control end at the left end of the second boom control valve are connected with an ascending signal; a control end at the right end of the second boom control valve is connected with a descending signal; and a control end at the left end of the first boom control valve is connected with the descending signal through the flow regeneration control valve. The boom descending control circuit has the advantages that the power consumption is reduced; the oil temperature of a system is reduced; and an energy-saving effect is achieved.
Description
Technical field
The utility model 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, in hydraulic crawler excavator, the oil return of hydraulic cylinder will be returned to fuel tank, if the oil return of hydraulic cylinder only has part to return to 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 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 make the control valve complex structure, cost is increased.
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 decline is 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, makes the boom cylinder akinesia.
The utility model content
The purpose of this utility model 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 decline realizes flow holomorphosis according to load automatically, can realize the function that flow regeneration automatically terminates under support car state is contacted to earth in assurance again, thereby reach the purpose of efficient energy-saving.
The technical solution of the utility model 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, 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 utility model 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 the utility model patent Hydraulic Excavator's Boom control loop for descending schematic diagram;
The specific embodiment
The utility model is described in further detail 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, due to 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, make boom cylinder 5 rodless cavities connect 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, make flow regeneration control valve 1 working position automatically switch 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 make swing arm the first control valve 2 get back to meta, hydraulic oil at P2 enters the swing arm rod chamber, under the effect of P2 pressure, swing arm descends, the fluid of swing arm rodless cavity all advanced the CT restriction and flowed back to fuel tank, complete 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, 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 |
|---|---|---|---|
| CN 201220658984 CN202945624U (en) | 2012-12-04 | 2012-12-04 | Boom descending control circuit for hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220658984 CN202945624U (en) | 2012-12-04 | 2012-12-04 | Boom descending control circuit for hydraulic excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202945624U true CN202945624U (en) | 2013-05-22 |
Family
ID=48421332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220658984 Withdrawn - After Issue CN202945624U (en) | 2012-12-04 | 2012-12-04 | Boom descending control circuit for hydraulic excavator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202945624U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966132A (en) * | 2012-12-04 | 2013-03-13 | 山河智能装备股份有限公司 | Swing arm descending control loop of hydraulic excavator |
-
2012
- 2012-12-04 CN CN 201220658984 patent/CN202945624U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966132A (en) * | 2012-12-04 | 2013-03-13 | 山河智能装备股份有限公司 | Swing arm descending control loop of hydraulic excavator |
| CN102966132B (en) * | 2012-12-04 | 2015-05-20 | 山河智能装备股份有限公司 | Swing arm descending control loop of hydraulic excavator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130522 Effective date of abandoning: 20150520 |
|
| RGAV | Abandon patent right to avoid regrant |