CN112681419A - System for improving slewing speed during loading of excavator and control method - Google Patents
System for improving slewing speed during loading of excavator and control method Download PDFInfo
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- CN112681419A CN112681419A CN202011494777.XA CN202011494777A CN112681419A CN 112681419 A CN112681419 A CN 112681419A CN 202011494777 A CN202011494777 A CN 202011494777A CN 112681419 A CN112681419 A CN 112681419A
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- movable arm
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- boom
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- 238000000034 method Methods 0.000 title claims description 10
- 239000003921 oil Substances 0.000 description 48
- 230000001133 acceleration Effects 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The invention discloses a system for improving the rotating speed of an excavator during loading, which comprises a pump I, a pump II, a movable arm oil cylinder, a rotating motor, a movable arm valve core II and a rotating valve core, wherein the pump I is connected with the pump II; high-pressure oil output by the first pump enters a rodless cavity of the movable arm oil cylinder through a control port of the first movable arm valve core; one path of high pressure output by the second pump enters the rotary motor through a control port of the rotary valve core; the other path enters a rodless cavity of the movable arm oil cylinder through a control port of a movable arm valve core II; the control ports of the movable arm valve core II and the movable arm oil cylinder rodless cavity are controlled by a proportional electromagnetic valve; the rotary pressure of the invention is not completely determined by the pressure of the movable arm any more, and the invention has a lifting space; the swing speed can be increased and the operation efficiency can be improved under the operation condition that the requirement for lifting the movable arm is not high.
Description
Technical Field
The invention relates to a system and a control method for improving the slewing speed of an excavator during loading, and belongs to the technical field of excavators.
Background
The conventional medium and large tonnage excavator products basically adopt double pumps to provide hydraulic oil, and one action is usually supplied by one pump or two pumps are supplied with oil simultaneously. When there are two or more operations, a situation occurs in which one pump supplies oil to a plurality of operations, and the pressure of the corresponding oil passage is determined by the operation of low pressure.
Boom lifting and slewing truck loading are one of the most common operations of an excavator, and the speed of the boom lifting and slewing truck loading is one of key factors considering the efficiency of the excavator. In the double-pump system, the movable arm is lifted by the first pump and the second pump to supply oil at the same time, and the movable arm is rotated by the second pump to supply oil. The lifting pressure of the movable arm is determined by the total weight of the working device and the cylinder diameter of the oil cylinder, and the maximum rotation pressure is set by the overflow pressure set by the rotation motor. Normally, the relief pressure of the swing motor is significantly higher than the boom lift pressure.
When the movable arm lifts and rotates, the pressure of the second pump and the corresponding oil circuit is determined by the pressure of the movable arm, and the rotating pressure is lower than the overflow pressure of the rotating motor, so that the rotating speed is influenced.
Disclosure of Invention
The invention aims to provide a system and a control method for improving the rotation speed of an excavator during loading, and aims to overcome the defect that the rotation speed is influenced because the rotation pressure is lower than the overflow pressure of a rotation motor when a movable arm moves simultaneously during lifting and rotating actions in the prior art.
Compared with the prior art, the invention has the following beneficial effects:
the rotary pressure of the invention is not completely determined by the pressure of the movable arm any more, and the invention has a lifting space; the swing speed can be increased and the operation efficiency can be improved under the operation condition that the requirement for lifting the movable arm is not high.
The rotation priority is set according to the whole machine and can be determined according to the use requirements of users, and the hardware of the whole machine system does not need to be changed.
Drawings
FIG. 1 is a system diagram of the present invention.
In the figure: 1. a first pump; 2. a second pump; 3. a boom cylinder; 4. a rotary motor; 5. a first movable arm valve core; 6. a second movable arm valve core; 7. a rotary valve core; 8. a proportional solenoid valve; 9. an overflow valve; 10. and an oil tank.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1, a system for improving the slewing speed of an excavator during loading is disclosed, which comprises a pump I1, a pump II 2, a movable arm oil cylinder 3, a slewing motor 4, a movable arm valve core II 6 and a slewing valve core 7;
high-pressure oil output by the pump I1 enters a rodless cavity of the movable arm oil cylinder 3 through a control port of a movable arm valve core I5; one path of high pressure output by the second pump 2 enters the rotary motor 4 through a control port of the rotary valve core 7; the other path enters a rodless cavity of the movable arm oil cylinder 3 through a control port of a movable arm valve core II 6; and the control ports of the movable arm valve core II 6 and the rodless cavity of the movable arm oil cylinder 3 are controlled by a proportional electromagnetic valve 8.
The working principle of the scheme is as follows:
the main pump I1 supplies oil to the movable arm oil cylinder 3 through a movable arm valve core I5, and the movable arm valve core I5 is a three-position six-way valve core. The second main pump 2 supplies oil to the movable arm oil cylinder 3 through a second movable arm valve core 6, and the second movable arm valve core 6 is a three-position six-way valve core.
When the pilot handle is operated alone to lift the boom, port XAb1 of the boom spool one 5 receives pilot pressure, the boom spool one 5 is switched to the left position, and the main pump one 1 supplies oil to the rodless cavity of the boom cylinder 3. When the controller judges that the operation is the single operation, the proportional solenoid valve 8 is controlled to supply the pilot pressure to XAb2 of the boom spool two 6, the boom spool two 6 is switched to the right position, and at this time, the main pump two 2 supplies oil to the large chamber of the boom cylinder 3.
The second main pump 2 supplies oil to the rotary motor 4 through a rotary valve core 7, and the rotary valve core 7 is a three-position six-way valve core.
When the pilot handle is independently operated to do left rotation (or right rotation) action, XAs (or XBs) receives pilot pressure, the rotation valve core 7 is switched to a left position (or a right position), at the moment, the main pump 2 supplies oil to an A port (or a B port) of the rotation motor 4, the rotation motor 4 drives the getting-on acceleration starting process, the rotation acceleration performance is determined by the working pressure of the rotation motor 4, and the working pressure of the rotation motor 4 is the overflow pressure of an overflow valve AR (or BR); when the pressure is higher than the relief pressure of relief valve 9AR (or relief valve 9 BR), the relief pressure is used.
When a pilot handle is operated to lift and rotate the movable arm at the same time, the main pump 1 supplies oil to a large cavity of the movable arm oil cylinder through a movable arm valve core 1; the main pump 2 supplies oil to a boom cylinder large cavity through the boom spool 2 and also supplies oil to the rotary motor 4 through the rotary spool 7, at this time, the working pressure of the rotary motor 4 is the boom lifting pressure and is smaller than the pressure of the overflow valve 9 of the rotary motor 4, in order to solve the problem that the getting-on acceleration performance is reduced due to the small working pressure of the rotary motor 4 during boom lifting and rotary actions, at this time, the opening degree of the right position of the boom spool 2 is controlled through the proportional electromagnetic valve 8, a throttling effect is generated, the pressure of the boom spool 2 on the side of the main pump 2 is higher than the pressure on the side of the boom cylinder large cavity, and therefore the working pressure of the rotary motor is improved.
When the controller detects that the boom lifts and rotates simultaneously, the controller controls the output pressure of the proportional solenoid valve 8, thereby controlling the opening degree of the right position of the boom spool 2.
Firstly, the rotation priority of the lifting and rotating of the movable arm is obtained through the setting of the whole machine, and the output pressure of the proportional solenoid valve 8 is determined according to the rotation priority, so that the opening degree of the movable arm valve core 2 is controlled. When the rotation priority is high, the output pressure of the proportional solenoid valve 8 is low, the opening degree of the boom valve spool 2 is low, and a large throttle pressure difference is generated when hydraulic oil flows through the boom valve spool 2, so that the pressure in front of the boom valve spool 2, that is, the pressure in front of the rotation valve spool 7 is increased. When the rotation priority is low, the output pressure of the proportional solenoid valve 8 is high, the opening degree of the valve core of the movable arm 2 is high, and the throttle pressure difference generated when the hydraulic oil flows through the valve core of the movable arm 2 is small, so that the pressure in front of the valve core of the movable arm 2, namely the pressure in front of the rotation valve core 7 is reduced.
As shown in fig. 1, a control method for improving the slewing speed of an excavator during loading is disclosed, which comprises the following specific steps:
when the boom cylinder 3 extends and the swing motor 4 rotates:
high-pressure oil output by the pump I1 enters a rodless cavity of the movable arm oil cylinder 3 through a control port of the movable arm valve core I5, and low-pressure oil output by a rod cavity of the movable arm oil cylinder 3 enters an oil tank 10 through an oil return port of the movable arm valve core I5; high-pressure oil output by the second pump 2 enters the rotary motor 4 through the rotary valve core 7, and low-pressure oil output by the rotary motor 4 enters the oil tank through an oil return port of the rotary valve core 7; the proportional solenoid valve 8 controls the size of a control port of the boom spool two 6.
When the controller collects that the movable arm oil cylinder 3 extends out and the rotary motor 4 rotates:
the controller controls the proportional solenoid valve 8 to generate pilot pressure so as to control the size of a control opening of the movable arm valve core II 6; when the control port of the movable arm valve core II 6 is closed, the high-pressure oil output by the pump II 2 cannot enter the rodless cavity of the movable arm oil cylinder 3; when the control port of the second movable arm valve core 6 is small, high-pressure oil output by the second pump 2 enters the rodless cavity of the movable arm oil cylinder 3 through the control port of the second movable arm valve core 6, and generates large pressure difference when passing through the control port of the second movable arm valve core 6; when the control port of the boom spool two 6 is large, the high-pressure oil output by the pump two 2 enters the rodless cavity of the boom cylinder 3 through the control port of the boom spool two 6, and a small pressure difference is generated when the high-pressure oil passes through the control port of the boom spool two 6.
When the boom cylinder 3 is extended without rotating the swing motor 4:
high-pressure oil output by the pump I1 enters a rodless cavity of the movable arm oil cylinder 3 through a control port of the movable arm valve core I5, and low-pressure oil output by a rod cavity of the movable arm oil cylinder 3 enters an oil tank 10 through an oil return port of the movable arm valve core I5; the proportional solenoid valve 8 controls the size of a control port of the boom spool two 6.
When the controller collects that the movable arm cylinder 3 extends and the rotary motor 4 does not rotate:
the controller controls the proportional solenoid valve 8 to generate pilot pressure so as to control the size of the control port of the boom spool II 6, and at the moment, the control port of the boom spool II 6 is made larger.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A system for improving the rotation speed of an excavator during loading is characterized by comprising a first pump (1), a second pump (2), a movable arm oil cylinder (3), a rotary motor (4), a movable arm valve core II (6), a rotary valve core (7) and a proportional electromagnetic valve (8);
high-pressure oil output by the pump I (1) enters a rodless cavity of the movable arm oil cylinder (3) through a control port of the movable arm valve core I (5); one path of high pressure output by the second pump (2) enters the rotary motor (4) through a control port of the rotary valve core (7); the other path enters a rodless cavity of the movable arm oil cylinder (3) through a control port of the movable arm valve core II (6); and the control ports of the movable arm valve core II (6) and the rodless cavity of the movable arm oil cylinder (3) are controlled by a proportional electromagnetic valve (8).
2. The system for improving the slewing speed when loading the excavator according to claim 1, wherein the oil inlet and the oil return port of the slewing motor (4) are provided with overflow valves (9).
3. The system for improving the slewing speed of the excavator during loading according to claim 1, wherein a one-way valve is arranged on an oil inlet path of the first pump (1) and the first movable arm valve core (6).
4. The system for improving the rotating speed of the excavator during loading according to claim 1, wherein one-way valves are arranged on the oil inlet paths of the second pump (2) and the rotating valve core (7) and the oil inlet paths of the second movable arm valve core (6).
5. The system for improving the slewing speed of the excavator during loading according to claim 1, wherein the boom spool I (5), the boom spool II (6) and the slewing spool (7) are three-position six-way spools.
6. A control method for increasing a slewing speed of an excavator during loading, the method comprising the steps of:
when the boom cylinder (3) extends and the swing motor (4) rotates:
high-pressure oil output by the pump I (1) enters a rodless cavity of the movable arm oil cylinder (3) through a control port of the movable arm valve core I (5); the second pump (2) outputs high-pressure oil to enter the rotary motor (4) through the rotary valve core (7);
when the boom cylinder (3) is extended and the swing motor (4) is not rotated:
the pump I (1) outputs high-pressure oil to enter a rodless cavity of the movable arm oil cylinder (3) through a control port of the movable arm valve core I (5).
7. The control method for increasing a turning speed of an excavator during loading of the excavator according to claim 6, wherein the method further comprises the steps of:
when the controller collects the stretching of the movable arm oil cylinder (3) and the rotation of the rotary motor (4):
the proportional electromagnetic valve (8) is controlled by the controller to generate pilot pressure so as to control the pressure of high-pressure oil output by the second pump (2) flowing into a rodless cavity of the boom cylinder (3) from a control port of the second boom valve core (6);
when the controller collects that the movable arm oil cylinder (3) extends out and the rotary motor (4) does not rotate: when the control port of the second boom valve core (6) is opened, the controller controls the proportional electromagnetic valve (8) to generate pilot pressure so as to control the size of the control port of the second boom valve core (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011494777.XA CN112681419A (en) | 2020-12-17 | 2020-12-17 | System for improving slewing speed during loading of excavator and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011494777.XA CN112681419A (en) | 2020-12-17 | 2020-12-17 | System for improving slewing speed during loading of excavator and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112681419A true CN112681419A (en) | 2021-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011494777.XA Pending CN112681419A (en) | 2020-12-17 | 2020-12-17 | System for improving slewing speed during loading of excavator and control method |
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| Country | Link |
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| CN (1) | CN112681419A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102400476A (en) * | 2011-10-28 | 2012-04-04 | 山河智能装备股份有限公司 | Hydraulic circuit controlling preferred movement of moveable arm to lift or rotate |
| CN102808433A (en) * | 2012-08-13 | 2012-12-05 | 山河智能装备股份有限公司 | Hydraulic circuit and method for controlling compound actions of excavator movable arm |
| JP2014148994A (en) * | 2013-01-31 | 2014-08-21 | Kobe Steel Ltd | Hydraulic control device of work machine |
| CN106884455A (en) * | 2017-03-08 | 2017-06-23 | 青岛雷沃挖掘机有限公司 | Operating mode self-adaptive hydraulic loop and excavator |
-
2020
- 2020-12-17 CN CN202011494777.XA patent/CN112681419A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102400476A (en) * | 2011-10-28 | 2012-04-04 | 山河智能装备股份有限公司 | Hydraulic circuit controlling preferred movement of moveable arm to lift or rotate |
| CN102808433A (en) * | 2012-08-13 | 2012-12-05 | 山河智能装备股份有限公司 | Hydraulic circuit and method for controlling compound actions of excavator movable arm |
| JP2014148994A (en) * | 2013-01-31 | 2014-08-21 | Kobe Steel Ltd | Hydraulic control device of work machine |
| CN106884455A (en) * | 2017-03-08 | 2017-06-23 | 青岛雷沃挖掘机有限公司 | Operating mode self-adaptive hydraulic loop and excavator |
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Application publication date: 20210420 |