CN202971075U - Load sensitive pump, load sensitive hydraulic system and concrete pumping equipment - Google Patents
Load sensitive pump, load sensitive hydraulic system and concrete pumping equipment Download PDFInfo
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- CN202971075U CN202971075U CN 201220655472 CN201220655472U CN202971075U CN 202971075 U CN202971075 U CN 202971075U CN 201220655472 CN201220655472 CN 201220655472 CN 201220655472 U CN201220655472 U CN 201220655472U CN 202971075 U CN202971075 U CN 202971075U
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Abstract
The utility model provides a load sensitive pump, a load sensitive hydraulic system and concrete pumping equipment. The load sensitive pump comprises a load feedback oil port, an oil pump main body, an output volume regulation device, a differential pressure setting element and a load sensitive valve, wherein the output volume regulation device is connected with the oil pump main body; the load sensitive valve comprises a first control oil port for providing a first acting force, a second control oil port for providing a second acting force and a third control oil port for providing a third acting force, wherein the directions of the second acting force and the third acting force are opposite to the direction of the first acting force; and the first control oil port of the load sensitive valve is connected with an output port of the oil pump main body, the second control oil port of the load sensitive valve is connected with the load feedback oil port, and the third control oil port of the load sensitive valve is connected with an output port of the differential pressure setting element. A hydraulic load sensitive pump with the differential pressure setting element is adopted, so that pressure difference can be automatically regulated according to different use conditions in real time.
Description
Technical field
The utility model relates to Hydraulic Field, more specifically, relates to a kind of load sensitive pump, load-sensitive hydraulic system and concrete pumping equipment.
Background technique
Fig. 1 shows the schematic diagram of the load-sensitive hydraulic system of the jib motion for controlling concrete mixer of the prior art.As shown in Figure 1, dynamical element 91 drives the oil pump main body 10 of load sensitive pump 100 and rotates, the pressure oil of oil pump main body 10 output is through manual or automatically controlled selector valve 93, drives the stretching out or regain of arm support oil cylinder 92 of concrete mixer, from so that realize expansion or the withdrawal of pumping vehicle arm rack.
Load sensitive pump 100 also comprises displacement adjusting mechanism 20 and load-sensitive valve 40, and wherein, displacement adjusting mechanism 20 is connected with oil pump main body 10.Displacement adjusting mechanism 20 comprises swash plate 21, servocylinder 22 and the variable cylinder 23 for Displacement Regulation; Swash plate 21 is connected with oil pump main body 10, and servocylinder 22 is connected with variable cylinder and is connected with the two ends of swash plate 21 respectively.
In the process of work, load feedback pressure oil acts on the left end of load-sensitive valve 40, also is provided with for the spring of setting pressure reduction at left end, and simultaneously, the pressure oil of oil pump main body 10 outputs acts on the right-hand member of load-sensitive valve 40.Like this, due to the existence of spring, guarantee the delivery pressure of oil pump main body 10 all the time greater than induced pressure, and had a stable pressure difference both.Especially, this pressure extent can be set by above-mentioned spring.This pressure extent affects the speed of response between meeting oil pump main body 10 and selector valve 93, and then affects the control response speed of arm support oil cylinder 92.
Above-mentioned pressure difference of the prior art can only mechanically be set because the mode that adopts spring is set, and can not change in real time according to the requirement of operating mode.That is to say, can not in real time, automatically regulate this pressure difference according to different service conditions, and then cause the control performance of concrete pump truck arm motion not good.In addition, in order to satisfy as much as possible the demand for control of the motion of concrete pump truck arm under various operating modes, the pressure difference operated by rotary motion is higher (for example, is generally that 1.5MPa～2.5MPa), this can cause the energy consumption of oil pump main body 10 when armed state higher.
The model utility content
The utility model aims to provide a kind of load sensitive pump, load-sensitive hydraulic system and concrete pumping equipment, the problem of fixing, can not regulate with the pressure difference of the setting that solves the prior art load sensitive pump.
For solving the problems of the technologies described above, according to first aspect of the present utility model, provide a kind of load sensitive pump, comprising: the load feedback hydraulic fluid port; The oil pump main body; Displacement adjusting mechanism, displacement adjusting mechanism is connected with the oil pump main body; The pressure differential resetting element; Load-sensitive valve, the 3rd control port that load-sensitive valve comprises be used to the first control port that the first active force is provided, is used for providing the second control port of the second active force and is used for providing the 3rd active force, the direction of the second active force and the 3rd active force and the opposite direction of the first active force; The first control port of load-sensitive valve is connected with the delivery outlet of oil pump main body, and the second control port of load-sensitive valve is connected with the load feedback hydraulic fluid port, and the 3rd control port of load-sensitive valve is connected with the delivery outlet of pressure differential resetting element.
Further, the inlet opening of pressure differential resetting element is connected with the delivery outlet of oil pump main body.
Further, load sensitive pump also comprises the aux. pressure oil sources, and the delivery outlet of aux. pressure oil sources is connected with the inlet opening of pressure differential resetting element.
Further, the pressure differential resetting element is reduction valve.
Further, the aux. pressure oil sources is quantitative oil pump or variable displacement oil pump.
Further, displacement adjusting mechanism comprises swash plate, servocylinder and the variable cylinder for Displacement Regulation; Swash plate is connected with the oil pump main body, and servocylinder is connected with an end of swash plate, and variable cylinder is connected with the other end of swash plate; Servocylinder is connected with the delivery outlet of oil pump main body; Load-sensitive valve comprises the first actuator port, the second actuator port and the 3rd actuator port, and the first actuator port switchably connects with the second actuator port and the 3rd actuator port; The first actuator port of load-sensitive valve is connected with the actuator port of variable cylinder; The second actuator port of load-sensitive valve is connected with the delivery outlet of oil pump main body, and the 3rd actuator port of load-sensitive valve is connected with fuel tank.
Further, load sensitive pump also comprises the pressure cut off element; The pressure cut off element comprises the first actuator port, the second actuator port and the 3rd actuator port, and the first actuator port switchably connects with the second actuator port and the 3rd actuator port; The first actuator port of pressure cut off element is connected with the actuator port of variable cylinder; The second actuator port of pressure cut off element is connected with the delivery outlet of oil pump main body, and the 3rd actuator port of pressure cut off element is connected with fuel tank; The pressure cut off element also comprises pressure setting section and control port, and the control port of pressure cut off element is connected with the delivery outlet of oil pump main body.
According to second aspect of the present utility model, a kind of load-sensitive hydraulic system is provided, comprise executive component, dynamical element and load sensitive pump, this load sensitive pump is above-mentioned load sensitive pump, the filler opening of executive component is connected with the delivery outlet of the oil pump main body of load sensitive pump, the filler opening of executive component is connected with the load feedback hydraulic fluid port of load sensitive pump, and dynamical element is connected with the oil pump main body of load sensitive pump.
According to the 3rd aspect of the present utility model, a kind of concrete pumping equipment is provided, comprise load-sensitive hydraulic system, this load-sensitive hydraulic system is above-mentioned load-sensitive hydraulic system, and the executive component of load-sensitive hydraulic system is the arm support oil cylinder of concrete pumping equipment.
Further, concrete pumping equipment also comprises control unit, is connected with the pressure differential resetting element of load sensitive pump, is used for the delivery pressure according to the regulating working conditions pressure differential resetting element of concrete pumping equipment.
The utility model adopts the hyraulic controlled type load sensitive pump with pressure differential resetting element, can in real time, automatically regulate the pressure extent according to different applying working conditions, with the concrete pump truck arm motion control performance that obtains to be complementary with specific operation, be suitable for the control requirement of concrete pump truck arm various working different operating modes such as (shelves as fast in jib, slow shelves) awaiting orders.
Description of drawings
The accompanying drawing that consists of the application's a part is used to provide further understanding of the present utility model, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not consist of improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 has schematically shown the schematic diagram of the load-sensitive hydraulic system of the jib motion for controlling concrete mixer of the prior art;
Fig. 2 has schematically shown the schematic diagram of the load-sensitive hydraulic system in the utility model the first embodiment; And
Fig. 3 has schematically shown the schematic diagram of the load-sensitive hydraulic system in the utility model the second embodiment.
Reference character in figure: 10, oil pump main body; 20, displacement adjusting mechanism; 21, swash plate; 22, servocylinder; 23, variable cylinder; 30, pressure differential resetting element; 40, load-sensitive valve; 41, the first control port; 42, the second control port; 43, the 3rd control port; 44, the first actuator port; 45, the second actuator port; 46, the 3rd actuator port; 50, aux. pressure oil sources; 60, load feedback hydraulic fluid port; 70, fuel tank; 80, pressure cut off element; 81, the first actuator port; 82, the second actuator port; 83, the 3rd actuator port; 84, pressure setting section; 85, control port; 90, executive component; 91, dynamical element; 92, arm support oil cylinder; 93, selector valve; 100, load sensitive pump.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
As first aspect of the present utility model, provide a kind of load sensitive pump.As shown in Figures 2 and 3, this load sensitive pump 100 comprises: load feedback hydraulic fluid port 60; Oil pump main body 10; Displacement adjusting mechanism 20, displacement adjusting mechanism 20 is connected with oil pump main body 10; Pressure differential resetting element 30; Load-sensitive valve 40, the 3rd control port 43, the second active forces and the direction of the 3rd active force and the opposite direction of the first active force that load-sensitive valve 40 comprises be used to the first control port 41 that the first active force is provided, is used for providing the second control port 42 of the second active force and is used for providing the 3rd active force; The first control port 41 of load-sensitive valve 40 is connected with the delivery outlet of oil pump main body 10, the second control port 42 of load-sensitive valve 40 is connected with load feedback hydraulic fluid port 60, and the 3rd control port 43 of load-sensitive valve 40 is connected with the delivery outlet of pressure differential resetting element 30.
During work, load-sensitive valve 40 is subject to the effect of the first active force, the second active force and the 3rd active force, and conversion between different stations under this three's the effect of making a concerted effort.Because the delivery pressure of pressure differential resetting element 30 can carry out real-time adjusting according to the situation of operating mode, therefore, also just can regulate in real time the delivery pressure of oil pump main body 10 and the pressure difference between induced pressure, therefore, can improve control performance.Simultaneously, when armed state, also can arrange pressure difference lower, thereby reduce energy consumption.
Preferably, in the embodiment shown in Figure 2, the inlet opening of pressure differential resetting element 30 is connected with the delivery outlet of oil pump main body 10.Like this, can directly utilize oil pump main body 10, and need not the pressure oil-source that provides other.In the embodiment shown in fig. 3, load sensitive pump 100 also comprises aux. pressure oil sources 50, and the delivery outlet of aux. pressure oil sources 50 is connected with the inlet opening of pressure differential resetting element 30.Preferably, aux. pressure oil sources 50 is quantitative oil pump or variable displacement oil pump.
Preferably, pressure differential resetting element 30 is reduction valve, for example, and proportional pressure-reducing valve.Certainly, pressure differential resetting element 30 can be also other hydraulic element, such as relief valve etc.
Preferably, please refer to Fig. 2 and Fig. 3, displacement adjusting mechanism 20 comprises swash plate 21, servocylinder 22 and the variable cylinder 23 for Displacement Regulation; Swash plate 21 is connected with oil pump main body 10, and servocylinder 22 is connected with an end of swash plate 21, and variable cylinder 23 is connected with the other end of swash plate 21; Servocylinder 22 is connected with the delivery outlet of oil pump main body 10.
Preferably, load-sensitive valve 40 comprises that the first actuator port 44, the second actuator port 45 and the 3rd actuator port 46, the first actuator ports 44 switchably connect with the second actuator port 45 and the 3rd actuator port 46; The first actuator port 44 of load-sensitive valve 40 is connected with the actuator port of variable cylinder 23; The second actuator port 45 of load-sensitive valve 40 is connected with the delivery outlet of oil pump main body 10, and the 3rd actuator port 46 of load-sensitive valve 40 is connected with fuel tank 70.Preferably, load-sensitive valve 40 is two position three-way valves.Especially, load-sensitive valve 40 is proportional servo valves.
Please refer to Fig. 2 and Fig. 3, when induced pressure increases, when the load-sensitive valve 40 of load sensitive pump 100 is in Fig. 2 or state (being left station) shown in Figure 3, the pressure oil of variable cylinder 23 is got back to fuel tank 70 through the first actuator port 44 and second actuator port 45 of load-sensitive valve 40, therefore, the piston rod of servocylinder 22 stretches out left, and promotes swash plate 21 and rotate counterclockwise, thereby increases the discharge capacity of oil pump main body 10.When induced pressure reduced, the load-sensitive valve 40 of load sensitive pump 100 was changed gradually to the state of Fig. 2 or right working position shown in Figure 3.At this moment, the pressure oil of oil pump main body 10 output flows into variable cylinder 23 by the first actuator port 44 after through the second actuator port 45.Like this, the piston rod of variable cylinder 23 stretches out left, and promote swash plate 21 clockwise directions and rotate, thus the discharge capacity of minimizing oil pump main body 10.By said process, reach the purpose of Displacement Regulation, and finally realize the adjusting of pressure.
Preferably, load sensitive pump 100 also comprises pressure cut off element 80; Pressure cut off element 80 comprises that the first actuator port 81, the second actuator port 82 and the 3rd actuator port 83, the first actuator ports 81 switchably connect with the second actuator port 82 and the 3rd actuator port 83; The first actuator port 81 of pressure cut off element 80 is connected with the actuator port of variable cylinder 23; The second actuator port 82 of pressure cut off element 80 is connected with the delivery outlet of oil pump main body 10, and the 3rd actuator port 83 of pressure cut off element 80 is connected with fuel tank 70.Pressure cut off element 80 also comprises pressure setting section 84 and control port 85, and the control port 85 of pressure cut off element 80 is connected with the delivery outlet of oil pump main body 10.Preferably, pressure cut off element 80 is two position three-way valves.Especially, pressure cut off element 80 is proportional servo valves.Especially, the pressure of pressure cut off element 80 can be by the pressure setting 84(of section such as spring etc.) set.
Please refer to Fig. 2 and Fig. 3, when the delivery pressure of oil pump main body 10 was excessive, pressure cut off element 80 was gradually changed to right working position by left station.So the pressure oil of oil pump main body 10 outputs flows into variable cylinder 23 through the second actuator port 82 and the first actuator port 81.Like this, the piston rod of variable cylinder 23 stretches out left, and promote swash plate 21 clockwise directions and rotate, thus the discharge capacity of minimizing oil pump main body 10, and finally reduced pressure, realized the function of safety guarantee.
As second aspect of the present utility model, please refer to Fig. 2 and Fig. 3, a kind of load-sensitive hydraulic system is provided, comprise executive component 90, dynamical element 91(such as motor etc.) and load sensitive pump, this load sensitive pump is above-mentioned load sensitive pump 100.The filler opening of executive component 90 is connected with the delivery outlet of the oil pump main body 10 of load sensitive pump 100, and the filler opening of executive component 90 is connected with the load feedback hydraulic fluid port 60 of load sensitive pump 100, and dynamical element 91 is connected with the oil pump main body 10 of load sensitive pump 100.
As the third aspect of the present utility model, please refer to Fig. 2 and Fig. 3, a kind of concrete pumping equipment is provided, comprise load-sensitive hydraulic system, this load-sensitive hydraulic system is above-mentioned load-sensitive hydraulic system.Especially, the executive component 90 of load-sensitive hydraulic system is the arm support oil cylinder of concrete pumping equipment.Preferably, concrete pumping equipment is concrete mixer.
Preferably, concrete pumping equipment also comprises control unit, is connected with the pressure differential resetting element 30 of load sensitive pump 100, is used for the delivery pressure according to the regulating working conditions pressure differential resetting element 30 of concrete pumping equipment.
During work, dynamical element 91 drives oil pump main body 10 and rotates, the pressure oil of oil pump main body 10 output is through selector valve 93(manual or automatically controlled proportional reversing valve for example) drive the stretching out or regain of oil cylinder of the jib of concrete mixer, and then realize expansion or the withdrawal of concrete pump truck arm.Wherein, the force value decision that during load sensitive pump 100 work, the pressure difference of the pressure of output and induced pressure is set by pressure differential resetting element 30, this pressure extent affects the characteristic of concrete pump truck arm motion control.
For example, when concrete pumping equipment needs faster speed of response (for example being operated in fast shelves state), the control unit of concrete pumping equipment obtains working condition signal, and utilize the delivery pressure of the pressure differential resetting element 30 of the responsive pump 100 of working condition signal control load to be in the first pressure, have larger pressure difference with the responsive pump 100 of proof load, satisfied the fast demand of jib motion control response.When concrete pumping equipment needs slower speed of response (for example being operated in slow shelves state), the control unit of concrete pumping equipment obtains working condition signal, and utilize the delivery pressure of the pressure differential resetting element 30 of the responsive pump 100 of working condition signal control load to be in the second pressure (the second pressure is less than the first pressure), have moderate pressure difference with the responsive pump 100 of proof load, satisfied the demand of jib motion control low-response.When concrete pump truck arm is failure to actuate, the control unit of concrete pumping equipment obtains working condition signal, and utilize the delivery pressure of the pressure differential resetting element 30 of the responsive pump 100 of working condition signal control load to be in the 3rd pressure (the 3rd pressure is less than the second pressure), have less pressure difference with the responsive pump 100 of proof load, thereby reduced the energy consumption of load sensitive pump when armed state.
The utility model adopts the load sensitive pump 100 of the hyraulic controlled type with pressure differential resetting element 30, can in real time, automatically regulate the pressure extent according to different applying working conditions, with the concrete pump truck arm motion control performance that obtains to be complementary with specific operation, be suitable for the control requirement of concrete pump truck arm various working different operating modes such as (shelves as fast in jib, slow shelves) awaiting orders.
The above is only preferred embodiment of the present utility model, is not limited to the utility model, and for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (10)
1. a load sensitive pump, is characterized in that, comprising:
Load feedback hydraulic fluid port (60);
Oil pump main body (10);
Displacement adjusting mechanism (20), described displacement adjusting mechanism (20) is connected with described oil pump main body (10);
Pressure differential resetting element (30);
Load-sensitive valve (40), the 3rd control port (43) that described load-sensitive valve (40) comprises be used to the first control port (41) that the first active force is provided, is used for providing second control port (42) of the second active force and is used for providing the 3rd active force, the direction of described the second active force and described the 3rd active force and the opposite direction of described the first active force;
First control port (41) of described load-sensitive valve (40) is connected with the delivery outlet of described oil pump main body (10), second control port (42) of described load-sensitive valve (40) is connected with described load feedback hydraulic fluid port (60), and the 3rd control port (43) of described load-sensitive valve (40) is connected with the delivery outlet of described pressure differential resetting element (30).
2. load sensitive pump according to claim 1, is characterized in that, the inlet opening of described pressure differential resetting element (30) is connected with the delivery outlet of described oil pump main body (10).
3. load sensitive pump according to claim 1, is characterized in that, described load sensitive pump (100) also comprises aux. pressure oil sources (50), and the delivery outlet of described aux. pressure oil sources (50) is connected with the inlet opening of described pressure differential resetting element (30).
4. load sensitive pump according to claim 1, is characterized in that, described pressure differential resetting element (30) is reduction valve.
5. load sensitive pump according to claim 3, is characterized in that, described aux. pressure oil sources (50) is quantitative oil pump or variable displacement oil pump.
6. the described load sensitive pump of any one according to claim 1 to 5, is characterized in that, described displacement adjusting mechanism (20) comprises swash plate (21), servocylinder (22) and the variable cylinder (23) for Displacement Regulation; Described swash plate (21) is connected with described oil pump main body (10), and described servocylinder (22) is connected with an end of described swash plate (21), and described variable cylinder (23) is connected with the other end of described swash plate (21); Described servocylinder (22) is connected with the delivery outlet of described oil pump main body (10);
Described load-sensitive valve (40) comprises the first actuator port (44), the second actuator port (45) and the 3rd actuator port (46), and described the first actuator port (44) switchably connects with described the second actuator port (45) and described the 3rd actuator port (46);
First actuator port (44) of described load-sensitive valve (40) is connected with the actuator port of described variable cylinder (23); Second actuator port (45) of described load-sensitive valve (40) is connected with the delivery outlet of described oil pump main body (10), and the 3rd actuator port (46) of described load-sensitive valve (40) is connected with fuel tank (70).
7. the described load sensitive pump of any one according to claim 1 to 5, is characterized in that, described load sensitive pump (100) also comprises pressure cut off element (80);
Described pressure cut off element (80) comprises the first actuator port (81), the second actuator port (82) and the 3rd actuator port (83), and described the first actuator port (81) switchably connects with described the second actuator port (82) and described the 3rd actuator port (83);
First actuator port (81) of described pressure cut off element (80) is connected with the actuator port of described variable cylinder (23); Second actuator port (82) of described pressure cut off element (80) is connected with the delivery outlet of described oil pump main body (10), and the 3rd actuator port (83) of described pressure cut off element (80) is connected with fuel tank (70);
Described pressure cut off element (80) also comprises pressure setting section (84) and control port (85), and the control port (85) of described pressure cut off element (80) is connected with the delivery outlet of described oil pump main body (10).
8. load-sensitive hydraulic system, comprise executive component (90), dynamical element (91) and load sensitive pump, it is characterized in that, described load sensitive pump is the described load sensitive pump of any one (100) in claim 1 to 7, the filler opening of described executive component (90) is connected with the delivery outlet of the oil pump main body (10) of described load sensitive pump (100), the filler opening of described executive component (90) is connected with the load feedback hydraulic fluid port (60) of described load sensitive pump (100), described dynamical element (91) is connected with the oil pump main body (10) of described load sensitive pump (100).
9. concrete pumping equipment, comprise load-sensitive hydraulic system, it is characterized in that, described load-sensitive hydraulic system is load-sensitive hydraulic system claimed in claim 8, and the executive component of described load-sensitive hydraulic system (90) is the arm support oil cylinder of described concrete pumping equipment.
10. concrete pumping equipment according to claim 9, it is characterized in that, described concrete pumping equipment also comprises control unit, be connected with the pressure differential resetting element (30) of described load sensitive pump (100), be used for the delivery pressure of pressure differential resetting element according to the regulating working conditions of described concrete pumping equipment (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220655472 CN202971075U (en) | 2012-12-03 | 2012-12-03 | Load sensitive pump, load sensitive hydraulic system and concrete pumping equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220655472 CN202971075U (en) | 2012-12-03 | 2012-12-03 | Load sensitive pump, load sensitive hydraulic system and concrete pumping equipment |
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| Publication Number | Publication Date |
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| CN202971075U true CN202971075U (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220655472 Withdrawn - After Issue CN202971075U (en) | 2012-12-03 | 2012-12-03 | Load sensitive pump, load sensitive hydraulic system and concrete pumping equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102996391A (en) * | 2012-12-03 | 2013-03-27 | 中联重科股份有限公司 | Load-sensitive pump, load-sensitive hydraulic system and concrete pumping device |
| CN103486101A (en) * | 2013-09-29 | 2014-01-01 | 徐州重型机械有限公司 | Controlling method and device for improving response speed of hydraulic oil pump |
| CN103953090A (en) * | 2014-05-12 | 2014-07-30 | 德州德工机械有限公司 | Grafting load sensing energy-saving hydraulic system of loader |
| CN108869432A (en) * | 2018-09-26 | 2018-11-23 | 徐州徐工施维英机械有限公司 | Hydraulic system and engineering machinery |
-
2012
- 2012-12-03 CN CN 201220655472 patent/CN202971075U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102996391A (en) * | 2012-12-03 | 2013-03-27 | 中联重科股份有限公司 | Load-sensitive pump, load-sensitive hydraulic system and concrete pumping device |
| CN102996391B (en) * | 2012-12-03 | 2016-03-02 | 中联重科股份有限公司 | Load sensitive pump, load-sensitive hydraulic system and concrete pumping equipment |
| CN103486101A (en) * | 2013-09-29 | 2014-01-01 | 徐州重型机械有限公司 | Controlling method and device for improving response speed of hydraulic oil pump |
| CN103486101B (en) * | 2013-09-29 | 2015-11-25 | 徐州重型机械有限公司 | A kind of controlling method and device improving hydraulic-pressure pump speed of response |
| CN103953090A (en) * | 2014-05-12 | 2014-07-30 | 德州德工机械有限公司 | Grafting load sensing energy-saving hydraulic system of loader |
| CN108869432A (en) * | 2018-09-26 | 2018-11-23 | 徐州徐工施维英机械有限公司 | Hydraulic system and engineering machinery |
| CN108869432B (en) * | 2018-09-26 | 2024-04-02 | 徐州徐工施维英机械有限公司 | Hydraulic system and engineering machinery |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20130605 Effective date of abandoning: 20160302 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |