CN202401511U - Novel current-limiting control system of excavator - Google Patents
Novel current-limiting control system of excavator Download PDFInfo
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- CN202401511U CN202401511U CN 201120475130 CN201120475130U CN202401511U CN 202401511 U CN202401511 U CN 202401511U CN 201120475130 CN201120475130 CN 201120475130 CN 201120475130 U CN201120475130 U CN 201120475130U CN 202401511 U CN202401511 U CN 202401511U
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Abstract
The utility model discloses a novel current-limiting control system of an excavator, which belongs to the field of electric-hydraulic control of hydraulic excavators and comprises a main controller, a main pump proportional valve, an S2 get-off pressure switch, an S1 get-on pressure switch, a rotation speed sensor, a revolution guiding pressure sensor, a P1 pump outlet pressure sensor, a P1 pump current-limiting pressure sensor, a P2 pump current-limiting pressure sensor, a P2 pump maximum current control proportional valve and a P1 pump maximum current control proportional valve, wherein the revolution guiding pressure sensor, the P1 pump outlet pressure sensor, the P1 pump current-limiting pressure sensor, the P2 pump current-limiting pressure sensor, the P2 pump maximum current control proportional valve and the P1 pump maximum current control proportional valve are electrically connected with the main controller. The novel current-limiting control system has the advantages of being capable of improving flexibility of hydraulic element selection and simultaneously avoiding damage to traveling motors caused by overlarge current of a hydraulic system; capable of judging motions needing current limiting through a detection device so as to avoid one-step-cut-off type current limiting and limiting output volume of two single pumps by controlling current of the two current-limiting proportional valves; and achieving accurate current-limiting control due to the fact that current control circuits of the proportional valves adopt closed-loop control.
Description
Technical field
The utility model relates to a kind of novel excavator Current limited Control system, belongs to hydraulic crawler excavator electrichydraulic control field.
Background technology
At present; Domestic excavator Hydraulic Elements mainly be to be fixed against import; The type selecting of hydraulic part has received great restriction; For the layout and the performance need that can satisfy main frame, often some main Hydraulic Elements can not carry out type selecting according to the specification of wanting, and is difficult to realize the Perfect Matchings as critical elements such as hydraulic pump, valve, rotary motor and running motors.Particularly need select large discharge pump and make full use of the power of motor for the operating efficiency that improves excavator; And executive component such as running motor and rotary motor receives spatial placement and other reasons can not select corresponding bigger discharge capacity at this moment, if do not carry out the application life that current limliting tends to reduce these executive components.The power utilization that some main frame producer selects to sacrifice motor is at this moment selected the pump of less discharge capacity; As shown in Figure 1, present medium-sized excavator generally adopts pumps in series, and two pumps that are cascaded are controlled different objects respectively; Revolution is generally single oil pump feed; Walking is distinguished fuel feeding for double pump, in some composite moves, does not need current limliting, must come out to control the purpose that does not reduce the utilization rate of motor when just can be implemented in current limliting again to these action recognition.The parameter of complete machine just can not take advantage in like product like this, how can when realizing the current-limiting protection executive component, not reduce very important that the power utilization of system shows again.
Summary of the invention
Problem to above-mentioned prior art existence; The utility model provides a kind of novel hydraulic excavator Current limited Control system; Can solve rotary motor and running motor needs the requirement of current limliting simultaneously, and can judge the action that needs current limliting through checkout gear, prevents the current limliting of clean cut formula; Electric current through controlling two current limliting proportioning valves can be realized the restriction to two single pumpages, when realizing the current-limiting protection executive component, does not reduce the power utilization of system again.
To achieve these goals; The technical scheme that the utility model adopts is: a kind of novel hydraulic excavator Current limited Control system; Comprise main controller, main pump proportioning valve, S2 get off pressure switch, S1 get on the bus pressure switch and speed probe; Also comprise the revolution pilot pressure sensor, P1 pump discharge pressure sensor, P1 pump current limliting pressure sensor, P2 pump current limliting pressure sensor, P2 pump maximum stream flow control ratio valve and the P1 pump maximum stream flow control ratio valve that are electrically connected with master controller respectively; Revolution pilot pressure sensor is installed on the revolution guide oil circuit at shuttle valve III place; P2 pump maximum stream flow control ratio valve is connected through the minus flow control port of shuttle valve II with the control of P2 pump swash plate; P1 pump maximum stream flow control ratio valve is connected through the minus flow control port of shuttle valve I with the control of P1 pump swash plate; P1 pump discharge pressure sensor is contained in above the main pump on the P1 delivery side of pump oil circuit, and P1 pump current limliting pressure sensor is installed between shuttle valve I and the P1 pump maximum stream flow control ratio valve, and P2 pump current limliting pressure sensor is installed between shuttle valve II and the P2 pump maximum stream flow control ratio valve; The shuttle valve I is installed between the N1 mouth and P1 pump maximum stream flow control ratio valve of main valve, and the shuttle valve II is installed between the N1 mouth and P2 pump maximum stream flow control ratio valve of main valve.
Further, revolution pilot pressure sensor is selected 40bar～80bar low pressure sensor.
Further, P2 pump maximum stream flow control ratio valve and P1 pump maximum stream flow control ratio valve adopt the inverse proportion electromagnetic relief pressure valve.
Further, P1 pump discharge pressure sensor adopts 400bar～600bar high pressure sensor.
Further, P1 pump current limliting pressure sensor and P2 pump current limliting pressure sensor are selected 40bar～80bar low pressure sensor.
The beneficial effect of the utility model is: master controller is regulated proportioning valve output according to setting program; Pass through the feedback signal of the signal of current limliting pressure sensor simultaneously as closed-loop control; Thereby make the oil pressure of the control oil channel of maximum stream flow control ratio valve reach the control requirement; The control oil pressure compares laggardly to go into the minus flow hydraulic fluid port that the main pump swash plate controls the swash plate angle is diminished through shuttle valve and minus flow pressure, thereby reaches the purpose of current limliting.Can increase the flexibility of Hydraulic Elements type selecting through this Current limited Control system; Simultaneously can prevent the excessive infringement of flow rate of hydraulic system to rotary motor and running motor; And can judge the action that needs current limliting through checkout gear; Prevent the current limliting of clean cut formula, can realize restriction two single pumpages through the electric current of controlling two current limliting proportioning valves.The proportioning valve current control loop adopts closed-loop control, thereby realizes Current limited Control accurately.
Description of drawings
Fig. 1 is traditional hydraulic pump flow-control figure;
Fig. 2 is the system schematic of the utility model.
1, main controller, 2, revolution pilot pressure sensor, 3, P1 pump discharge pressure sensor, 4, P1 pump current limliting pressure sensor, 5, P2 pump current limliting pressure sensor; 6, P2 pump maximum stream flow control ratio valve, 7, P1 pump maximum stream flow control ratio valve, 8, the main pump proportioning valve, 91, the shuttle valve I, 92, the shuttle valve II; 93, shuttle valve III, 10, motor, 11, the S2 pressure switch of getting off, 12, the S1 pressure switch of getting on the bus; 13, main valve, 14, hydraulic oil container, 15, main pump, 16, speed probe.
The specific embodiment
To combine accompanying drawing that the utility model is described further below.
As shown in Figure 2; A kind of novel hydraulic excavator Current limited Control system; Comprise main controller 1, main pump proportioning valve 8, S2 get off pressure switch 11, S1 get on the bus pressure switch 12 and speed probe 16; Also comprise the revolution pilot pressure sensor 2, P1 pump discharge pressure sensor 3, P1 pump current limliting pressure sensor 4, P2 pump current limliting pressure sensor 5, P2 pump maximum stream flow control ratio valve 6 and the P1 pump maximum stream flow control ratio valve 7 that are electrically connected with master controller 1 respectively; Revolution pilot pressure sensor 2 is installed on the revolution guide oil circuit at shuttle valve III 93 places, and revolution pilot pressure sensor 2 is selected the 50bar low pressure sensor.P2 pump maximum stream flow control ratio valve 6 is connected through the minus flow control port of shuttle valve II 92 with the control of P2 pump swash plate; P1 pump maximum stream flow control ratio valve 7 is connected through the minus flow control port of shuttle valve I 91 with the control of P1 pump swash plate, and P2 pump maximum stream flow control ratio valve 6 adopts the inverse proportion electromagnetic relief pressure valve with P1 pump maximum stream flow control ratio valve 7.P1 pump discharge pressure sensor 3 is contained on the main pump 15 top P1 delivery side of pump oil circuits, and P1 pump discharge pressure sensor 3 adopts the 500bar high pressure sensors.P1 pump current limliting pressure sensor 4 is installed between shuttle valve I 91 and the P1 pump maximum stream flow control ratio valve 7; P2 pump current limliting pressure sensor 5 is installed between shuttle valve 92 II and the P2 pump maximum stream flow control ratio valve 6, and P1 pump current limliting pressure sensor 4 is selected the 50bar low pressure sensor with P2 pump current limliting pressure sensor 5.The shuttle valve I is installed between the N1 mouth and P1 pump maximum stream flow control ratio valve of main valve, and the shuttle valve II is installed between the N1 mouth and P2 pump maximum stream flow control ratio valve of main valve.
When implementing above-mentioned Current limited Control system, control method is following:
At first; Whether system detects to get off and moves through get off pressure switch 11 of S2; When action S2 pressure switch 11 closures of getting off of getting off; Master controller 1 detects low level, if S1 this moment gets on the bus that pressure switch 12 move and master controller 1 to detect the S1 pressure switch 12 state-detection mouth input signals of getting on the bus be low level, the needs Current limited Control of walking this moment is then judged by system; Otherwise when action and the S1 Current limited Control of need not walking when pressure switch 12 is also moved of getting on the bus of getting off.
In addition when master controller 1 detects revolution pilot pressure sensor 2 signals and be judged as the revolution action; If master controller 1 through this moment P1 pump discharge pressure sensor 3 signal to judge be single revolution action at this moment; And judge that according to motor 10 tach signals this moment, rotating speed was higher than 2000rpm (parameter is adjustable), the adjustable Current limited Control of turning round of system delay 10S parameter.If master controller 1 through this moment P1 pump discharge pressure sensor 3 signal to judge be the combined state that the revolution action adds other actions at this moment, and judge that according to motor 10 tach signals rotating speed was higher than 2000rpm (parameter is adjustable) system and did not turn round Current limited Control this moment.When engine rotational speed signal was lower than 2000rpm (parameter is adjustable), revolution had action also not turn round Current limited Control even motor 10 detects this moment in addition.
At last; Controller 1 can change the oil pressure of maximum stream flow control oil channel through the drive current of regulating pump maximum stream flow control ratio valve after the above-mentioned any current limliting demand of system validation; Control oil channel is gone into the control port of main pump swash plate through shuttle valve with from the minus flow return pressure is more laggard; The angle of the big more swash plate of the pressure of this hydraulic fluid port is big more, and pump delivery is more little, thereby reaches the purpose of current limliting.In order to reach accurate Current limited Control, adopted the control of closed loop, whether the drive current that the feedback signal through pump current limliting pressure sensor detects maximum stream flow control ratio valve reaches the control requirement.When attending system's electric elements fault, it is zero that controller makes the electric current of maximum stream flow control ratio valve, and this moment, pump delivery was minimum, can prevent to take place because the discharge capacity that the electric system fault causes can't limit the phenomenon of infringement hydraulic actuator thereby do like this.
Claims (5)
1. novel hydraulic excavator Current limited Control system; Comprise main controller (1), main pump proportioning valve (8), S2 get off pressure switch (11), S1 get on the bus pressure switch (12) and speed probe (16); It is characterized in that; Also comprise the revolution pilot pressure sensor (2), P1 pump discharge pressure sensor (3), P1 pump current limliting pressure sensor (4), P2 pump current limliting pressure sensor (5), P2 pump maximum stream flow control ratio valve (6) and the P1 pump maximum stream flow control ratio valve (7) that are electrically connected with master controller (1) respectively; Revolution pilot pressure sensor (2) is installed on the revolution guide oil circuit at shuttle valve III (93) place; P2 pump maximum stream flow control ratio valve (6) is connected through the minus flow control port of shuttle valve II (92) with the control of P2 pump swash plate; P1 pump maximum stream flow control ratio valve (7) is connected through the minus flow control port of shuttle valve I (91) with the control of P1 pump swash plate; P1 pump discharge pressure sensor (3) is contained on the top P1 delivery side of pump oil circuit of main pump (15); P1 pump current limliting pressure sensor (4) is installed between shuttle valve I (91) and the P1 pump maximum stream flow control ratio valve (7); P2 pump current limliting pressure sensor (5) is installed between shuttle valve II (92) and the P2 pump maximum stream flow control ratio valve (6), and shuttle valve I (91) is installed between the N1 mouth and P1 pump maximum stream flow control ratio valve (7) of main valve (13), and II (92) is installed between the N1 mouth and P2 pump maximum stream flow control ratio valve (6) of main valve (13).
2. a kind of novel hydraulic excavator Current limited Control according to claim 1 system is characterized in that described revolution pilot pressure sensor (2) is selected 40bar～80bar low pressure sensor.
3. a kind of novel hydraulic excavator Current limited Control according to claim 1 system is characterized in that described P2 pump maximum stream flow control ratio valve (6) and P1 pump maximum stream flow control ratio valve (7) adopt the inverse proportion electromagnetic relief pressure valve.
4. a kind of novel hydraulic excavator Current limited Control according to claim 1 system is characterized in that described P1 pump discharge pressure sensor (3) adopts 400bar～600bar high pressure sensor.
5. a kind of novel hydraulic excavator Current limited Control according to claim 1 system is characterized in that described P1 pump current limliting pressure sensor (4) and P2 pump current limliting pressure sensor (5) are selected 40bar～80bar low pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120475130 CN202401511U (en) | 2011-11-25 | 2011-11-25 | Novel current-limiting control system of excavator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120475130 CN202401511U (en) | 2011-11-25 | 2011-11-25 | Novel current-limiting control system of excavator |
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| CN202401511U true CN202401511U (en) | 2012-08-29 |
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| CN 201120475130 Expired - Lifetime CN202401511U (en) | 2011-11-25 | 2011-11-25 | Novel current-limiting control system of excavator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493523A (en) * | 2011-11-25 | 2012-06-13 | 徐州徐工挖掘机械有限公司 | Novel excavator current-limiting control system |
| CN102901649A (en) * | 2012-09-29 | 2013-01-30 | 徐州徐工挖掘机械有限公司 | Device for testing heat balance performance and method for assessing heat dispersion performance of hydraulic excavator |
| CN103046610A (en) * | 2012-12-28 | 2013-04-17 | 三一重机有限公司 | Traveling signal detection device and traveling machinery |
| CN103233494A (en) * | 2013-05-09 | 2013-08-07 | 上海三一重机有限公司 | Energy-saving control system, excavator and method |
| CN103628518A (en) * | 2013-08-12 | 2014-03-12 | 上海三一重机有限公司 | Composite action priority control system and method and excavator |
| CN105986596A (en) * | 2015-03-16 | 2016-10-05 | 住友重机械工业株式会社 | A digging machine |
-
2011
- 2011-11-25 CN CN 201120475130 patent/CN202401511U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493523A (en) * | 2011-11-25 | 2012-06-13 | 徐州徐工挖掘机械有限公司 | Novel excavator current-limiting control system |
| CN102493523B (en) * | 2011-11-25 | 2013-12-04 | 徐州徐工挖掘机械有限公司 | Novel excavator current-limiting control system |
| CN102901649A (en) * | 2012-09-29 | 2013-01-30 | 徐州徐工挖掘机械有限公司 | Device for testing heat balance performance and method for assessing heat dispersion performance of hydraulic excavator |
| CN102901649B (en) * | 2012-09-29 | 2015-05-13 | 徐州徐工挖掘机械有限公司 | Device for testing heat balance performance and method for assessing heat dispersion performance of hydraulic excavator |
| CN103046610A (en) * | 2012-12-28 | 2013-04-17 | 三一重机有限公司 | Traveling signal detection device and traveling machinery |
| CN103046610B (en) * | 2012-12-28 | 2015-09-02 | 三一重机有限公司 | A kind of walk signal checkout gear and walking machine |
| CN103233494A (en) * | 2013-05-09 | 2013-08-07 | 上海三一重机有限公司 | Energy-saving control system, excavator and method |
| CN103233494B (en) * | 2013-05-09 | 2015-09-16 | 上海三一重机有限公司 | A kind of energy-saving control system, excavator and method |
| CN103628518A (en) * | 2013-08-12 | 2014-03-12 | 上海三一重机有限公司 | Composite action priority control system and method and excavator |
| CN103628518B (en) * | 2013-08-12 | 2016-03-02 | 上海三一重机有限公司 | A kind of composite action priority control system, method and excavator |
| CN105986596A (en) * | 2015-03-16 | 2016-10-05 | 住友重机械工业株式会社 | A digging machine |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120829 |
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| CX01 | Expiry of patent term |