CN208330867U - A kind of distributed direct drive excavator hydraulic system of servo motor driving bivariate pump - Google Patents
A kind of distributed direct drive excavator hydraulic system of servo motor driving bivariate pump Download PDFInfo
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- CN208330867U CN208330867U CN201820544009.2U CN201820544009U CN208330867U CN 208330867 U CN208330867 U CN 208330867U CN 201820544009 U CN201820544009 U CN 201820544009U CN 208330867 U CN208330867 U CN 208330867U
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- variable displacement
- displacement pump
- way variable
- hermetic
- servo motor
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Abstract
The distributed direct that the utility model provides a kind of servo motor driving bivariate pump drives excavator hydraulic system, first two-way variable displacement pump, second two-way variable displacement pump and servo motor are directly connected to, independently to drive the hydraulic cylinder, and pass through two first two-way variable displacement pumps, the flow equilibrium of second two-way variable displacement pump realization hydraulic cylinder, it is driven simultaneously using servo motor, so that replacing the distributed intelligence of fluid pressure line transmitting power to control with conducting wire, the main loop of the utility model is very short and does not have restricting element, therefore the pressure loss is few, calorific value is few, cooling device is not needed, the restriction loss and spill losses of system are avoided simultaneously, system effectiveness is higher, and the utility model is in the case where over-running load, it can also be that electric energy is stored into the power supply device by the potential energy for loading feedback, it is reused , saved the energy.
Description
Technical field
The utility model relates to technical field of hydraulic pressure, especially a kind of distributed direct of servo motor driving bivariate pump is driven
Excavator hydraulic system.
Background technique
Hydraulic crawler excavator is as machinery most common in engineering machinery, and there are oil consumption height, discharge is poor, capacity usage ratio is low
Disadvantage.It is on the rise under situation in energy shortage and problem of environmental pollution, how to realize the energy conservation and emission reduction of excavator, increasingly
Paid attention to by people, becomes the hot spot studied at present.
Current excavator still uses Engine-variable Pump System-multi-way valve-actuator drive system.Since energy conservation and environmental protection is wanted
It asks, part research substitutes engine using ordinary motor, but system effectiveness is still to be improved.With the phase of AC servomotor
After succeeding in developing, servo motor-quantitative hydraulic pump/motor-hydraulic valve-actuator system has carried out engineer application, such as injection molding machine
Deng.These hydraulic system power-economizing methods play an important role in terms of improving efficiency.
A kind of utility model patent: all-electric servo excavator (application number: 201110453095.9), using AC servo
The electro-mechanical transmission and servo-system, its advantages that motor is combined with ball-screw are that electric energy is directly transformed to mechanical energy, is
System is simple to consume energy less, occupies little space.But require low speed high torque, greatly contribute operating condition when, the transmission of this electro-mechanical and servo
System will could complete drive task plus retarder, make complex system.It is wanted even if not being able to satisfy still plus retarder sometimes
It asks, such as in high-power transmission, best transmission scheme is exactly to select electro-hydraulic drive system or electrohydraulic servo system.
Utility model patent: complete electrically driven (operated) hydraulic crawler excavator dynamical system (application number: 201610406357.9), is led to
The revolving speed size and rotary speed direction for controlling each servo motor are crossed, thus to control the two-way quantitative connecting with each servo motor
The size and Orientation of the output flow of pump is finally completed the speed control to each hydraulic actuator.1. the system is used and is watched
One two-way quantitative pump of motor driven is taken to control symmetrical hydraulic cylinder, the effective area of hydraulic cylinder piston side reduces, so that piston
High power output amplitude reduces when stretching.2. torque needed for driving constant displacement pump is larger, to motor performance when system pressure is higher
It is required that it is high, such as require torque, power bracket wide, and the system can not recycle the energy of over-running load feedback.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of distributed direct of servo motor driving bivariate pump
Excavator hydraulic system is driven, is directly connected to bivariate pump and servo motor to carry out independent driving hydraulic cylinder, not only realizes hydraulic cylinder
The accurate matching of two sides flow, energy conservation loss and spill losses, the system effectiveness for avoiding system are high.Simultaneously because using row is become
The control of amount and variable speed can reach the broader range of speeds and obtain biggish torque output, reduces the property of servo motor
It can require.Hydraulic cylinder realizes driving on demand, saves electric energy, while the energy of over-running load feedback can be recycled.
The utility model is realized in this way: a kind of distributed direct drive excavator of servo motor driving bivariate pump is hydraulic
System, including a controller, a power supply device and an at least hydraulic module；The hydraulic module includes a hydraulic cylinder, one first
Two-way variable displacement pump, one second two-way variable displacement pump, a servo motor, a frequency converter and an accumulator；The hydraulic cylinder includes cylinder
Body, piston and piston rod, one end of the piston rod are fixedly connected on the piston, and the piston air-tightness is slidably connected
In in the cylinder body, and the cylinder interior is divided into first chamber and second chamber by the piston；
The frequency converter and the controller are electrically connected in the power supply device, and the frequency converter is electrically connected to described
Servo motor, the output end of the servo motor are connected to the driving of first two-way variable displacement pump and the second two-way variable displacement pump
End, the Single port of first two-way variable displacement pump are hermetic connected to the first chamber；Second two-way variable displacement pump
Single port is hermetic connected to the second chamber；The other end of first two-way variable displacement pump and second bidirectional variable
The accumulator is hermetic connected to after the other end air-tightness of pump is in parallel；It is first two-way variable displacement pump, second pair described
It is communicatively coupled to the controller respectively to variable pump, the frequency converter.
It further, further include one first check valve and a second one-way valve, first check valve includes first entrance
And first outlet, the second one-way valve include second entrance and second outlet；The Single port of first two-way variable displacement pump with
The first outlet hermetic connects while being hermetic connected to the first chamber；The one of second two-way variable displacement pump
Port is hermetic connect with the second outlet, while being hermetic connected to the second chamber；The first entrance with
The accumulator is hermetic connected to after the parallel connection of the second entrance air-tightness.
It further, further include two two-position two-way solenoid valves, the Single port of first two-way variable displacement pump and described the
One outlet hermetic connects, while being hermetic connected to described the after a two-position two-way solenoid valve of hermetic connecting
One chamber；The Single port of second two-way variable displacement pump is hermetic connect with the second outlet, while hermetic being connected
The second chamber is hermetic connected to after another two-position two-way solenoid valve, two two-position two-way solenoid valves lead to respectively
Letter is connected to the controller.
Further, there are three the hydraulic modules.
The utility model has the advantages that the utility model provides a kind of distribution of servo motor driving bivariate pump
Straight to drive excavator hydraulic system, first two-way variable displacement pump, the second two-way variable displacement pump and servo motor are directly connected to, and are come independent
The hydraulic cylinder is driven, and realizes that the flow of hydraulic cylinder is flat by two first two-way variable displacement pumps, the second two-way variable displacement pump
Weighing apparatus, while being driven using servo motor, so that replace the distributed intelligence of fluid pressure line transmitting power to control with conducting wire, this system
Major loop is very short and does not have restricting element, therefore the pressure loss is few, calorific value is few, does not need cooling device, while avoiding and being
The restriction loss and spill losses of system, system effectiveness is higher, and the utility model can also incite somebody to action in the case where over-running load
The potential energy of load feedback is that electric energy is stored into the power supply device, is reused, has saved the energy.
Detailed description of the invention
The utility model is further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is that a kind of servo motor described in the utility model drives the distributed direct of bivariate pump to drive excavator hydraulic pressure system
The schematic diagram of system.
Fig. 2 is that a kind of servo motor described in the utility model drives the distributed direct of bivariate pump to drive excavator hydraulic pressure system
The schematic diagram of the operating condition 1 of system.
Fig. 3 is that a kind of servo motor described in the utility model drives the distributed direct of bivariate pump to drive excavator hydraulic pressure system
The schematic diagram of the operating condition 2 of system.
Fig. 4 is that a kind of servo motor described in the utility model drives the distributed direct of bivariate pump to drive excavator hydraulic pressure system
The schematic diagram of the operating condition 3 of system.
Fig. 5 is that a kind of servo motor described in the utility model drives the distributed direct of bivariate pump to drive excavator hydraulic pressure system
The schematic diagram of the operating condition 4 of system.
Fig. 6 is the speed control principle figure of servo motor described in the utility model.
Fig. 7 is that a kind of servo motor described in the utility model drives the distributed direct of bivariate pump to drive excavator hydraulic pressure system
The effect diagram of system.
In figure: 1, controller；2, hydraulic module；21, hydraulic cylinder；211, cylinder body；2111, first chamber；2112, the second chamber
Room；212, piston；213, piston rod；22, two-position two-way solenoid valve；23, the first check valve；231, first entrance；232, first
Outlet；24, second one-way valve；241, second entrance；242, second outlet；25, the first two-way variable displacement pump；26, the second two-way change
Amount pump；27, servo motor；28, frequency converter；29, accumulator；3, scraper bowl；4, dipper；5, swing arm；A, the specified function of servo motor
Rate.
Specific embodiment
Refering to Figure 1, the distributed direct that the utility model provides a kind of servo motor driving bivariate pump drives and excavates
Machine hydraulic system, including a controller 1, a power supply device (not shown) and an at least hydraulic module 2；The hydraulic module 2 wraps
Include a hydraulic cylinder 21, one first two-way variable displacement pump 25, one second two-way variable displacement pump 26, a servo motor 27, a frequency converter 28 with
An and accumulator 29；The hydraulic cylinder 21 includes cylinder body 211, piston 212 and piston rod 213, and one end of the piston rod 213 is solid
Surely it is connected to the piston 212,212 air-tightness of piston is slidably connected in the cylinder body 211, and the piston
212 will be divided into first chamber 2111 and second chamber 2112 inside the cylinder body 211；
The frequency converter 28 and the controller 1 are electrically connected in the power supply device (not shown), the frequency converter
28 are electrically connected to the servo motor 27, and the output end of the servo motor 27 is connected to first two-way variable displacement pump 25 and
The driving end of two two-way variable displacement pumps 26, realization move synchronously, and the Single port of first two-way variable displacement pump 25 hermetic connects
In the first chamber 2111；The Single port of second two-way variable displacement pump 26 is hermetic connected to the second chamber
2112；Gas after the other end air-tightness of the other end of first two-way variable displacement pump 25 and second two-way variable displacement pump 26 is in parallel
It is connected to the accumulator 29 to close property；First two-way variable displacement pump 25, second two-way variable displacement pump 26, the frequency converter
28 are communicatively coupled to the controller 1 respectively, and the controller 1 controls the frequency converter 28 and adjusts turning for the servo motor 27
Fast size and Orientation, and then the output flow of adjusting first two-way variable displacement pump 25 and second two-way variable displacement pump 26 is big
Small and direction, the controller 1 directly controls first two-way variable displacement pump 25 and second two-way variable displacement pump 26 is adjusted respectively
From discharge capacity size and Orientation, it is final to realize that controlling the hydraulic cylinder 211 accurately exports, and is precisely controlled load to realize
It works.
Since the piston rod 213 makes the first chamber 2111 and second chamber 2112 for unsymmetric structure,
The hydraulic cylinder 21 is asymmetrical cylinder, and the maximum volume of the first chamber 2111 is greater than the second chamber 2112 most
Big volume；First two-way variable displacement pump 25, the second two-way variable displacement pump 26 and servo motor 27 are directly connected to independently to drive
The hydraulic cylinder 21, not only realize 21 two chambers of hydraulic cylinder flow accurate matching, avoid system energy conservation loss and
Spill losses, system effectiveness are high.
The piston rod 213 is connected to the load of excavator, carries out frequency conversion to the servo motor 27 according to load variation
Speed regulation, as shown in fig. 6, mode of speed regulation, using low load high speed, middle load speed approaches its rated power, and heavy duty limits its revolving speed, with
This dynamically adjusts the discharge capacity of first two-way variable displacement pump 25 and second two-way variable displacement pump 26 simultaneously, theoretically two it is two-way
The discharge capacity ratio of variable pump and the work area ratio of 21 liang of chambers of the hydraulic cylinder are corresponding, but due on high-tension side bidirectional variable
Pump is because pressure is high, and output flow is more, in order to supplement the oil liquid that on high-tension side two-way variable displacement pump is leaked, therefore the high-pressure side
Two-way variable displacement pump discharge capacity it is more slightly higher than theoretical value, realize the accurate matching of the two chambers of the hydraulic cylinder 21.
Due to being driven using the servo motor 27, instead of original engine, so that realization replaces original with conducting wire
There is the distributed intelligence control of fluid pressure line transmitting power, the hydraulic system major loop of the utility model is very short and without throttling member
Part, therefore the pressure loss is few, calorific value is few, does not need cooling device.
Compared to conventional hydraulic, the hydraulic system of the utility model is closed system, with oil less, required volume of fuel tank very
It is small, it can be the servomotor 27, first two-way variable displacement pump 25, second two-way variable displacement pump 26, the accumulator
29,28 groups of the frequency converter is integral, is made into hydraulic packet form, small in size, can be arranged near excavator load.
The utility model can reach the broader range of speeds and biggish turn of acquisition using the control for becoming discharge capacity and variable speed
Square output, reduces the performance requirement of servo motor.
Servo motor replaces engine driving variable pump, and system effectiveness greatly improves, and realizes energy conservation, emission reduction and noise reduction.
It works after legacy system booting, executing agency does not work and do not shut down yet, and motor and oil pump are run as usual, and energy consumption is big.
And the hydraulic cylinder 21 is when needing work, and the servo motor 27 operates, when the hydraulic cylinder 21 does not work, the servo electricity
Machine 27 stalls, and realizes driving on demand, saves electric energy.
The working principle of the utility model, there are following four operating conditions:
It please refers to shown in Fig. 2 to Fig. 5, F is the external force that load is applied to the piston rod 213 in figure, and v is the piston
The speed of service of bar 213；Hydraulic coupling direction and external force F's is contrary；The piston rod 213 is connected to the load of excavator,
The load of excavator can generate potential energy during the work time, can be transmitted to by the piston rod 213 hydraulic module 2 into
Row power generation storage is in the power supply device (not shown)；First two-way variable displacement pump 25 and second two-way variable displacement pump
26 both can be used as pump, can also be used as motor and generated electricity；
Positive value load: hydraulic coupling direction is identical as the direction of speed v, 213 stretchings of the piston rod/retraction, described at this time
Servo motor 27 described in power supply device output electrical energy drive (not shown) drives first two-way variable displacement pump 25 or described second
Two-way variable displacement pump 26, the hydraulic cylinder 21 export energy to load；
Over-running load: hydraulic coupling direction is contrary with speed v's, 213 stretchings of the piston rod/retraction, load feedback
Energy gives the hydraulic cylinder 21, and then first two-way variable displacement pump 25 or second two-way variable displacement pump 26 is made to be in power generation shape
State stores energy to the power supply device (not shown), is recycled.
Operating condition 1 please refers to shown in Fig. 2: in the case where for over-running load, the piston rod 213 is retracted, the piston rod
213 by the pressure loaded, and F is pressure at this time, so that 2111 pressure of the first chamber is higher, the potential energy of load is transmitted
It drives first two-way variable displacement pump 25 to generate electricity to the hydraulic cylinder 21, and then by hydraulic circuit, power storage is arrived
It in the power supply device (not shown), is recycled, has saved energy, at this time the stream of the oil liquid in the hydraulic module 2
To are as follows: the oil liquid in the first chamber 2111 is transported to second two-way variable displacement pump by first two-way variable displacement pump 25
26, then be transported to the second chamber 2112 by second two-way variable displacement pump 26, this is on high-tension side described first two-way at this time
The discharge capacity of variable pump 25 is more slightly higher than theoretical value, realizes the accurate matching of 21 two chambers of hydraulic cylinder.Simultaneously because first chamber
The maximum volume of room 2111 is greater than the maximum volume of the second chamber 2112, therefore the first chamber 2111 transports out
It is extra that oil liquid has, and extra oil liquid is flowed directly into the accumulator 29 after coming out from first two-way variable displacement pump 25 and stored
Get up.
Operating condition 2 please refers to shown in Fig. 3: in the case where for positive value load, the piston rod 213 stretches out, the piston rod
213 by the pressure loaded, and F is pressure at this time, so that 2111 pressure of the first chamber is higher, the controller 1 controls institute
It states frequency converter 28 and then controls the servo motor 27 and drive second two-way variable displacement pump 26, by the second chamber 2112
Oil liquid is transported to first two-way variable displacement pump 25, and is transported to the first chamber by first two-way variable displacement pump 25
2111, since the maximum volume of the first chamber 2111 is greater than the maximum volume of the second chamber, also need at this time described
Oil liquid in accumulator 29 is supplemented, and the oil liquid in accumulator 29 is flowed to first two-way variable displacement pump 25, by described
One two-way variable displacement pump 25 is transported to together in the first chamber 2111.On high-tension side first two-way variable displacement pump 25 at this time
Discharge capacity it is more slightly higher than theoretical value, realize 21 two chambers of hydraulic cylinder accurate matching.
Operating condition 3 please refers to shown in Fig. 4: in the case where for over-running load, the piston rod 213 stretches out, the piston rod
213 by the pulling force loaded, and F is pulling force at this time, so that 2112 pressure of the second chamber is higher, the controller 1 controls institute
It states frequency converter 28 and then controls the servo motor 27 and drive second two-way variable displacement pump 26, by the second chamber 2112
Oil liquid is transported to first two-way variable displacement pump 25, and is transported to the first chamber by first two-way variable displacement pump 25
2111, also need the oil liquid in the accumulator 29 to be supplemented at this time, the oil liquid in the accumulator 29 is flowed to described
One two-way variable displacement pump 25, and the first chamber 2111 is transported to by first two-way variable displacement pump 25 together.It loads at this time
Potential energy passes to the hydraulic cylinder 21, and then drives second two-way variable displacement pump 26 to generate electricity by hydraulic circuit, will be electric
It can store in the power supply device (not shown), be recycled, saved energy.At this time this on high-tension side described second
The discharge capacity of two-way variable displacement pump 26 is more slightly higher than theoretical value, realizes the accurate matching of 21 two chambers of hydraulic cylinder.
Operating condition 4 please refers to shown in Fig. 5: in the case where for positive value load, the piston rod 213 is retracted, the piston rod
213 by the pulling force loaded, and F is pulling force at this time, and the pressure of the second chamber 2112 is greater than the pressure of the first chamber 2111
Power, the at this time flow direction of the oil liquid in the hydraulic module 2 are as follows: the oil liquid in the first chamber 2111 is two-way by described first
Variable pump 25 is transported to second two-way variable displacement pump 26, and is transported to the second chamber by second two-way variable displacement pump 26
2112, the extra oil liquid that the first chamber 2111 flows out at this time directly flows after first two-way variable displacement pump 25 outflow
Enter and is stored in the accumulator 29.The discharge capacity of on high-tension side second two-way variable displacement pump 26 is omited than theoretical value simultaneously
Height realizes the accurate matching of 21 two chambers of hydraulic cylinder.
In a specific embodiment, it is preferable that it further include one first check valve 23 and a second one-way valve 24, described
One check valve 23 includes first entrance 231 and first outlet 232, and the second one-way valve 24 includes second entrance 241 and second
Outlet 242；The Single port of first two-way variable displacement pump 25 is hermetic connect with the first outlet 232, while air-tightness
Ground is connected to the first chamber 2111；The Single port of second two-way variable displacement pump 26 and 242 air-tightness of second outlet
Ground connection, while being hermetic connected to the second chamber 2112；The first entrance 231 and 241 gas of second entrance
The accumulator 29 is hermetic connected to after the parallel connection of close property.Pass through first check valve 23 and the second one-way valve 24
It can prevent occurring other adverse effects such as air pocket in the hydraulic module 2.
In a specific embodiment, it is preferable that further include two two-position two-way solenoid valves 22, first two-way variable displacement pump
25 Single port is hermetic connect with the first outlet 232, while a two-position two-way solenoid valve of hermetic connecting
The first chamber 2111 is hermetic connected to after 22；The Single port of second two-way variable displacement pump 26 and the second outlet
242 hermetic connect, while being hermetic connected to after another two-position two-way solenoid valve 22 of hermetic connecting described
Second chamber 2112, two two-position two-way solenoid valves 22 are communicatively coupled to the controller 1 respectively.Two described two two
Three-way electromagnetic valve 22 is mainly locked out the hydraulic cylinder 21, avoids due to first two-way variable displacement pump 25 or the second bidirectional variable
It is slided caused by the oil liquid leakage of pump 26.
In a specific embodiment, it is preferable that there are three the hydraulic modules 2.Three hydraulic modules 2 correspond
It is connected to the swing arm 5, dipper 4, scraper bowl 3 of excavator, realizes that three independently drives, facilitates control.
Although those familiar with the art answers the foregoing describe specific embodiment of the present utility model
Working as understanding, we are merely exemplary described specific embodiment, rather than for the limit to the scope of the utility model
Fixed, those skilled in the art modification and variation equivalent made by the spirit according to the utility model all should
Cover in the scope of the claimed protection of the utility model.
Claims (4)
1. a kind of distributed direct of servo motor driving bivariate pump drives excavator hydraulic system, it is characterised in that: including a control
Device, a power supply device and an at least hydraulic module processed；The hydraulic module includes a hydraulic cylinder, one first two-way variable displacement pump, one
Second two-way variable displacement pump, a servo motor, a frequency converter and an accumulator；The hydraulic cylinder includes cylinder body, piston and piston
Bar, one end of the piston rod are fixedly connected on the piston, and the piston air-tightness is slidably connected in the cylinder body,
And the cylinder interior is divided into first chamber and second chamber by the piston；
The frequency converter and the controller are electrically connected in the power supply device, and the frequency converter is electrically connected to the servo
Motor, the output end of the servo motor are connected to the driving end of first two-way variable displacement pump and the second two-way variable displacement pump, institute
The Single port for stating the first two-way variable displacement pump is hermetic connected to the first chamber；The Single port of second two-way variable displacement pump
Hermetic it is connected to the second chamber；The other end of first two-way variable displacement pump and second two-way variable displacement pump it is another
The accumulator is hermetic connected to after one end air-tightness is in parallel；First two-way variable displacement pump, second bidirectional variable
Pump, the frequency converter are communicatively coupled to the controller respectively.
2. a kind of distributed direct of servo motor driving bivariate pump according to claim 1 drives excavator hydraulic system,
It is characterized by also including one first check valve and a second one-way valve, first check valve includes first entrance and first
Outlet, the second one-way valve includes second entrance and second outlet；The Single port of first two-way variable displacement pump and described the
One outlet hermetic connects, while being hermetic connected to the first chamber；The Single port of second two-way variable displacement pump
It is hermetic connect with the second outlet, while being hermetic connected to the second chamber；The first entrance with it is described
The accumulator is hermetic connected to after the parallel connection of second entrance air-tightness.
3. a kind of distributed direct of servo motor driving bivariate pump according to claim 2 drives excavator hydraulic system,
It is characterized by also including two two-position two-way solenoid valves, the Single port of first two-way variable displacement pump and the first outlet
It hermetic connects, while being hermetic connected to first chamber after a two-position two-way solenoid valve of hermetic connecting
Room；The Single port of second two-way variable displacement pump is hermetic connect with the second outlet, while it is another hermetic to connect
The second chamber is hermetic connected to after the two-position two-way solenoid valve, two two-position two-way solenoid valves distinguish communication link
It is connected to the controller.
4. a kind of distributed direct of servo motor driving bivariate pump according to claim 1-3 drives excavator liquid
Pressure system, it is characterised in that: there are three the hydraulic modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820544009.2U CN208330867U (en) | 2018-04-17 | 2018-04-17 | A kind of distributed direct drive excavator hydraulic system of servo motor driving bivariate pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820544009.2U CN208330867U (en) | 2018-04-17 | 2018-04-17 | A kind of distributed direct drive excavator hydraulic system of servo motor driving bivariate pump |
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| Publication Number | Publication Date |
|---|---|
| CN208330867U true CN208330867U (en) | 2019-01-04 |
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|---|---|---|---|
| CN201820544009.2U Expired - Fee Related CN208330867U (en) | 2018-04-17 | 2018-04-17 | A kind of distributed direct drive excavator hydraulic system of servo motor driving bivariate pump |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425893A (en) * | 2018-04-17 | 2018-08-21 | 福建工程学院 | A kind of distributed direct drive excavator hydraulic system of servo motor driving bivariate pump |
| CN111412198A (en) * | 2019-12-29 | 2020-07-14 | 福建工程学院 | Speed closed-loop control method for variable-rotation-speed dual-pump cylinder control closed system under four-quadrant working condition |
| CN113251013A (en) * | 2021-06-07 | 2021-08-13 | 中冶赛迪技术研究中心有限公司 | Electro-hydraulic direct-drive servo closed differential control driving system of stepping lifting mechanism |
-
2018
- 2018-04-17 CN CN201820544009.2U patent/CN208330867U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425893A (en) * | 2018-04-17 | 2018-08-21 | 福建工程学院 | A kind of distributed direct drive excavator hydraulic system of servo motor driving bivariate pump |
| CN108425893B (en) * | 2018-04-17 | 2023-11-17 | 福建工程学院 | Hydraulic system of distributed direct-driven excavator with servo motor driven double variable pumps |
| CN111412198A (en) * | 2019-12-29 | 2020-07-14 | 福建工程学院 | Speed closed-loop control method for variable-rotation-speed dual-pump cylinder control closed system under four-quadrant working condition |
| CN113251013A (en) * | 2021-06-07 | 2021-08-13 | 中冶赛迪技术研究中心有限公司 | Electro-hydraulic direct-drive servo closed differential control driving system of stepping lifting mechanism |
| CN113251013B (en) * | 2021-06-07 | 2022-08-12 | 中冶赛迪技术研究中心有限公司 | Electro-hydraulic direct-drive servo closed differential control driving system of stepping lifting mechanism |
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