CN202658654U - Hydraulic pump power control device of excavator - Google Patents
Hydraulic pump power control device of excavator Download PDFInfo
- Publication number
- CN202658654U CN202658654U CN 201220292991 CN201220292991U CN202658654U CN 202658654 U CN202658654 U CN 202658654U CN 201220292991 CN201220292991 CN 201220292991 CN 201220292991 U CN201220292991 U CN 201220292991U CN 202658654 U CN202658654 U CN 202658654U
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- hydraulic pump
- pressure
- hydraulic
- pump
- control device
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Abstract
The utility model discloses a hydraulic pump power control device of an excavator, comprising an engine (5), wherein the engine (5) is in driving connection with a first hydraulic pump (2), a second hydraulic pump (3) and a third hydraulic pump (4) all variable in displacement, and a fixed-displacement pilot pump (1). The hydraulic pump power control device of the excavator further comprises a servo valve (7) and a pressure adjusting plunger (8), wherein a first stepped surface (8a), a second stepped surface (8b), a third stepped surface (8c) and a fourth stepped surface (8d) are formed on the pressure adjusting plunger (8); the outlet of the pilot pump (1) is connected with one oil opening of a pressure regulating valve (24); the fourth stepped surface (8d) of the pressure adjusting plunger (8) is connected to the other oil opening of the pressure regulating valve (24) through a tenth pipe (27). The hydraulic pump power control device of the excavator enables the output power of the engine to be effectively utilized and prevents the output power from being located in the low power output range; therefore, the working efficiency of the hydraulic excavator is improved and the utilization rate of the fuel oil is increased.
Description
Technical field
The utility model relates to a kind of hydraulic pump output control device, particularly relate to a kind of hydraulic pump of excavator output control device, this control device can make the power output of motor be able to effectively and fully utilize, and guarantees that simultaneously motor is no more than specified power output.
Background technology
As prior art, such as Fig. 1, this technology comprises 3 hydraulic pumps that become discharge capacity of a motor driven, guide's hydraulic pump of 1 fixed displacement and a plurality of actuator, in order to prevent overload, the general power of 4 hydraulic pumps is no more than the peak power output of motor, simultaneously for the operating efficiency that improves excavator and the power that effectively utilizes motor, need to make engine operation interval at the power stage of the best, namely at the first hydraulic pump 2, the second hydraulic pump 3, during 4 work of the 3rd hydraulic pump, need to make the first hydraulic pump 2, the second hydraulic pump 3, total absorbed power of the 3rd hydraulic pump 4 is near the performance number of a certain setting of motor, such as the desirable permanent power curve of L1 of Fig. 3.
The pressure-flow curve of the first hydraulic pump 2 as shown in Figure 4, when the first hydraulic pump 2 is operated in d2-d3 during the stage, because making self discharge capacity reduce the pressure that pressure pilot plunger 8 is produced to the left, the pressure rise of the first hydraulic pump 2 output increases, servo valve 7 is moved to the left under the promotion of pressure pilot plunger 8 active forces, reduced the variable point of the second hydraulic pump 3 and the 3rd hydraulic pump 4, if the output pressure of the first hydraulic pump 2 is more and more higher, the variable point of the second hydraulic pump 3 and the 3rd hydraulic pump 4 is constantly reduced, to become s-c1-c2-c3(L3 by s-a1-a2-a3 curve (L1 is desirable permanent power curve) such as the flow rate pressure change curve of its second hydraulic pump 3 of Fig. 3 and the 3rd hydraulic pump 4 is desirable permanent power curve), as seen the second hydraulic pump 3 and the 3rd hydraulic pump 4 absorbed powers sharply reduce, and by the first hydraulic pump 2 pressure-flow curves as can be known along with the increase of pressure, the absorbed power of the first hydraulic pump 2 is also reducing, this shows the first hydraulic pump 2, the second hydraulic pump 3, the absorbed power of the 3rd hydraulic pump 4 can not make the power of motor be fully used, it is interval to make it be operated in lower power stage, affect operating efficiency, reduced the utilization rate of fuel oil.
The utility model content
Technical problem to be solved in the utility model provides a kind of power output of motor that can make and can be effectively utilized, prevent from being in the low-power output interval, improve the operating efficiency of hydraulic crawler excavator, increase the hydraulic pump of excavator output control device of the utilization rate of fuel oil.
In order to solve the problems of the technologies described above, the hydraulic pump of excavator output control device that the utility model provides, comprise motor, motor and the first hydraulic pump that becomes discharge capacity, the second hydraulic pump, the 3rd hydraulic pump is connected pioneer pump and drive is connected with fixed displacement, also comprise servo valve and pressure pilot plunger, the pressure pilot plunger is provided with First terrace 8a, second step face 8b, the 3rd step surface 8c, the 4th step surface 8d, described guide's delivery side of pump is connected with a hydraulic fluid port of pressure-regulating valve, and the 4th step surface 8d of described pressure pilot plunger is connected with another hydraulic fluid port of pressure-regulating valve by the tenth pipeline.
Described guide's delivery side of pump is connected with overflow valve.
The control end of described pressure-regulating valve adopts the hydraulic pressure signal, i.e. the control port of described pressure-regulating valve 24 is connected with described the first hydraulic pressure delivery side of pump.
The control end of described pressure-regulating valve adopts electric signal.
Adopt the hydraulic pump of excavator output control device of technique scheme, the absorbed power of the first hydraulic pump is regulated by adjuster, flow-pressure diagram according to the first hydraulic pump, before the output pressure of the first hydraulic pump did not reach variable point, the absorbed power of the first hydraulic pump increased progressively with the increase of pressure; After the output pressure of the first hydraulic pump was increased to variable point, the absorbed power of the first hydraulic pump was along with the reduction of discharge capacity, and absorbed power is no more than the absorption maximum power of the first hydraulic pump, and along with its absorbed power of increase of pressure constantly descends.
The second hydraulic pump and the 3rd hydraulic pressure pump delivery determine by servo valve, pressure pilot plunger and discharge capacity pilot plunger are common, the second hydraulic pump, the 3rd hydraulic pump are along with the output pressure of these two pumps increases, when two pump output pressure averages were put less than variable, the absorbed power of the second hydraulic pump, the 3rd hydraulic pump increased along with the increase of pressure; When the second hydraulic pump, when the 3rd hydraulic pump output pressure average is put more than or equal to variable, the absorbed power of the second hydraulic pump, the 3rd hydraulic pump keeps Approximate Constant numerical value along with the increase of pressure.
For the power that makes motor effectively utilizes, need to make the absorbed power summation of the first hydraulic pump, the second hydraulic pump, the 3rd hydraulic pump less than or equal to the peak power output of motor, so the absorbed power of the second hydraulic pump and the 3rd hydraulic pump and, along with the absorbed power of the first hydraulic pump changes and changes, its duty can be divided into according to the state of the first hydraulic pump two kinds of working conditions:
Situation one: when the first hydraulic pump output pressure is put less than variable, the absorbed power of the first hydraulic pump increases and increases along with output pressure, will guarantee the absorbed power of the first hydraulic pump, the second hydraulic pressure the 3rd hydraulic pump this moment, namely utilize the output pressure of the first hydraulic pump to act on pressure-regulating valve, the total absorbed power of the second hydraulic pump, the 3rd hydraulic pump is reduced, but the second hydraulic pump, the 3rd hydraulic pump still satisfy permanent power control.
Situation two: when the first hydraulic pump output pressure is put more than or equal to variable, the absorbed power of knowing the second hydraulic pump, the 3rd hydraulic pump according to the pressure-flow curve of the first hydraulic pump increases and sharply reduces along with output pressure, thereby caused total absorbed power of the first hydraulic pump, the second hydraulic pump, the 3rd hydraulic pump far below the peak power output of motor reality.
For the power that makes motor can take full advantage of when the situation two, increase pressure-regulating valve, pioneer pump is connected with pressure-regulating valve, the pressure of pioneer pump acts on the step surface of pressure pilot plunger after regulating through pressure-regulating valve, for the second hydraulic pump, the 3rd hydraulic pump are not descended in situation absorbed power once, increase the spring force of servo valve, guaranteed situation once the peak power output of motor absorbed by the first hydraulic pump, the second hydraulic pump, the 3rd hydraulic pump.
After the improvement, when situation two because the output pressure of pressure-regulating valve increases according to the pressure of the second hydraulic pump reduces, reduced the active force that acts on the pressure pilot plunger this moment, total absorbed power of the second hydraulic pump, the 3rd hydraulic pump is not sharply descended because of the first hydraulic pump output pressure, thereby effectively utilized the power of motor.
In sum, the utility model is that a kind of power output of motor that can make can be effectively utilized, and prevents from being in the low-power output interval, improves the operating efficiency of hydraulic crawler excavator, increases the hydraulic pump of excavator output control device of the utilization rate of fuel oil.
Description of drawings
Fig. 1 is the hydraulic circuit of original pump power control device.
Fig. 2 is the hydraulic circuit of the utility model pump power control device.
Fig. 3 is flow-pressure diagram and the desirable absorbed power curve of the second hydraulic pump and the 3rd hydraulic pump.
Fig. 4 is flow-pressure diagram and the desirable absorbed power curve of the first hydraulic pump.
The specific embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 2, motor 5 and the first hydraulic pump 2 that becomes discharge capacity, the second hydraulic pump 3, the 3rd hydraulic pump 4 is connected pioneer pump 1 and is driven and connect with fixed displacement, the output pressure of pioneer pump 1 keeps certain value through overflow valve 25, the outlet of pioneer pump 1 is connected with a hydraulic fluid port of pressure-regulating valve 24 by the first pipeline 23, the first hydraulic pump 2, the second hydraulic pump 3, the 3rd hydraulic pump 4 respectively with the first control valve 19, the second control valve 18, the 3rd control valve 17 connects and driving hydraulic actuator the first hydraulic jack 20, the second hydraulic jack 21, hydraulic motor 22 execution actions, the second pipeline 14 is connected with the 3rd pipeline 16 of the first hydraulic pump 2, the 4th pipeline 14b connection adjustor 15, the fluid discharge capacity of the first hydraulic pump 2 is by the 3rd pipeline 16, flow through the second pipeline 14 and the 4th pipeline 14b acts on the adjuster 15, realize the corresponding variation of pressure and discharge capacity, its pressure-flow variation relation is shown in Fig. 4 (L4 is desirable permanent power curve).
The second hydraulic pump 3, the 3rd hydraulic pump 4 are connected with the 5th pipeline 13, the 6th pipeline 12 respectively, in two pipelines maximum pressure through shuttle valve group 26 relatively and through the place, left side that acts on discharge capacity pilot plunger 6 after the control of servo valve 7 and directly be communicated with discharge capacity pilot plunger 6 right sides.
As shown in Figure 4, at the first hydraulic pump 2 pressure at d1-d2 during the stage, the first hydraulic pump 2 is in less than variable point operation interval, this moment is along with the increase of the first hydraulic pump 2 pressure, the first hydraulic pump 2 absorbed powers become along with pressure increases and increases, output pressure at this staged pressure control valve 24 is the definite value of pioneer pump 1, this shows, at the output pressure of P2 very hour, the pressure-flow curve of the second hydraulic pump 3 and the 3rd hydraulic pump 4 s-a1-a2-a3 curve (L1 is maximum ideal power curve this moment) as shown in Figure 3, increase along with the output pressure of the first hydraulic pump 2, the absorbed power of the first hydraulic pump 2 is increasing, the absorbed power of the second hydraulic pump 3 and the 3rd hydraulic pump 4 reduces, become gradually (L2 is maximum ideal power curve this moment) shown in the s-b1-b2-b3 curve as shown in Figure 3, the power output of motor 5 remains on rationally, effective operation interval;
At the first hydraulic pump 2 pressure at d2-d3 during the stage, the first hydraulic pump 2 is in greater than variable point operation interval, this moment is along with the increase of the first hydraulic pump 2 pressure, the first hydraulic pump 2 absorbed powers become along with pressure increases and reduces, increase and carry out throttling control at the output pressure of this staged pressure control valve 24 along with the output pressure of the first hydraulic pump 2, the output pressure of pressure-regulating valve 24 is reduced, this moment, pressure pilot plunger 8 was because the pressure increase of the 3rd step surface 8c, the pressure decreased of the 4th step surface 8d, make its reduction to discharge capacity smaller, so the second hydraulic pump 3, the absorbed power of the 3rd hydraulic pump 4 still remains on shown in the s-b1-b2-b3 curve near (L2 is maximum ideal power curve this moment), the power output of motor 5 remains on maximum output area, take full advantage of the power of motor 5, prevented that the pressure-flow curve of the second hydraulic pump 3 and the 3rd hydraulic pump 4 from working (L3 is maximum ideal power curve this moment) in the s-c1-c2-c3 scope.
Claims (4)
1. hydraulic pump of excavator output control device, comprise motor (5), motor (5) and the first hydraulic pump (2) that becomes discharge capacity, the second hydraulic pump (3), the 3rd hydraulic pump (4) is connected pioneer pump (1) and drive is connected with fixed displacement, also comprise servo valve (7) and pressure pilot plunger (8), pressure pilot plunger (8) is provided with First terrace (8a), second step face (8b), the 3rd step surface (8c), the 4th step surface (8d), it is characterized in that: the outlet of described pioneer pump (1) is connected with a hydraulic fluid port of pressure-regulating valve (24), and the 4th step surface (8d) of described pressure pilot plunger (8) is connected with another hydraulic fluid port of pressure-regulating valve (24) by the tenth pipeline (27).
2. hydraulic pump of excavator output control device according to claim 1, it is characterized in that: the outlet of described pioneer pump (1) is connected with overflow valve (25).
3. hydraulic pump of excavator output control device according to claim 1 and 2, it is characterized in that: the control end of described pressure-regulating valve (24) adopts the hydraulic pressure signal, i.e. the control port of described pressure-regulating valve (24) is connected with the outlet of described the first hydraulic pump (2).
4. hydraulic pump of excavator output control device according to claim 1 and 2 is characterized in that: the control end employing electric signal of described pressure-regulating valve (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220292991 CN202658654U (en) | 2012-06-20 | 2012-06-20 | Hydraulic pump power control device of excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220292991 CN202658654U (en) | 2012-06-20 | 2012-06-20 | Hydraulic pump power control device of excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202658654U true CN202658654U (en) | 2013-01-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220292991 Expired - Lifetime CN202658654U (en) | 2012-06-20 | 2012-06-20 | Hydraulic pump power control device of excavator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202658654U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102704527A (en) * | 2012-06-20 | 2012-10-03 | 山河智能装备股份有限公司 | Power control device for hydraulic pump of excavator |
| CN115324149A (en) * | 2022-06-30 | 2022-11-11 | 三一重机有限公司 | Hydraulic pump control method, hydraulic pump control device and working machine |
-
2012
- 2012-06-20 CN CN 201220292991 patent/CN202658654U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102704527A (en) * | 2012-06-20 | 2012-10-03 | 山河智能装备股份有限公司 | Power control device for hydraulic pump of excavator |
| CN115324149A (en) * | 2022-06-30 | 2022-11-11 | 三一重机有限公司 | Hydraulic pump control method, hydraulic pump control device and working machine |
| CN115324149B (en) * | 2022-06-30 | 2023-10-27 | 三一重机有限公司 | Hydraulic pump control method and device and working machine |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130109 |
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| CX01 | Expiry of patent term |