CN205136238U - Pump sending hydraulic system and mobile concrete pump - Google Patents
Pump sending hydraulic system and mobile concrete pump Download PDFInfo
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- CN205136238U CN205136238U CN201520989418.XU CN201520989418U CN205136238U CN 205136238 U CN205136238 U CN 205136238U CN 201520989418 U CN201520989418 U CN 201520989418U CN 205136238 U CN205136238 U CN 205136238U
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- 238000005086 pumping Methods 0.000 claims description 22
- 230000008859 change Effects 0.000 claims description 2
- 206010020852 Hypertonia Diseases 0.000 abstract 1
- 241000208682 Liquidambar Species 0.000 abstract 1
- 235000006552 Liquidambar styraciflua Nutrition 0.000 abstract 1
- 235000013399 edible fruits Nutrition 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 163
- 239000007788 liquid Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000008676 import Effects 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 1
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Abstract
The utility model provides a pump sending hydraulic system and a mobile concrete pump, wherein, the pump sending hydraulic system include: first master cylinder, second master cylinder and the main valve that commutates, wherein, access connection to the hydraulic power source of the main valve that commutates, main the commutate first working hole of valve and the first end that the second working hole was connected to first master cylinder and second master cylinder respectively, the oil return opening of the main valve that commutates is connected to the oil tank through auto -change over device, auto -change over device includes first oil return way and second oil return way, and first oil return is provided with the pressure switch valve on the road, and the pressure switch valve is opened under the predetermined pressure, and second oil return sweetgum fruit is crossed the radiator and is connected to the oil tank. This technical scheme on the one hand, gets into in the oil tank after can making the oil return cooled off through the radiator, on the other hand, through setting up the pressure switch valve, can be when the return pressure be greater than the default, make the oil return directly pass through the pressure switch valve flow and to the oil tank in, ensure can not damage the radiator owing to oil return hypertonia.
Description
Technical Field
The utility model relates to a mobile concrete pump technical field particularly, relates to a pump sending hydraulic system and a mobile concrete pump.
Background
At present, as shown in fig. 1, when a concrete pump truck cools return oil of a system, the amount of oil entering a radiator is generally increased by increasing the opening pressure of a bypass valve 11 in an oil return valve, but in this way, the pressure of the return oil is increased, and high-pressure return oil generates a large impact force on the radiator, so that the radiator is easily damaged.
Therefore, how to design a pumping hydraulic system capable of cooling return oil and avoiding damage to a radiator caused by return oil impact is a problem to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
The present invention aims at least solving one of the technical problems existing in the prior art or the related art.
To this end, an object of the present invention is to provide a pumping hydraulic system.
Another object of the utility model is to provide a concrete pump truck.
To achieve at least one of the above objects, according to an embodiment of the first aspect of the present invention, there is provided a pumping hydraulic system including: the first main oil cylinder, the second main oil cylinder and the main reversing valve; the inlet of the main reversing valve is connected to a hydraulic source, a first working port and a second working port of the main reversing valve are respectively connected to first ends of the first main oil cylinder and the second main oil cylinder, and an oil return port of the main reversing valve is connected to an oil tank through a switching device; the switching device comprises a first oil return path and a second oil return path, wherein a pressure switch valve is arranged on the first oil return path, the pressure switch valve is opened under preset pressure, and the second oil return path is connected to the oil tank through a radiator.
According to the pumping hydraulic system of the embodiment of the utility model, the oil return port of the main reversing valve is connected to the oil tank through the switching device, wherein the switching device comprises the first oil return path provided with the pressure switch valve which is opened under the preset pressure and the second oil return path which is connected to the oil tank through the radiator, then the second oil return path through the switching device can firstly lead part of the oil return of the first main oil cylinder or the second main oil cylinder into the radiator and then flows into the oil tank after being cooled by the radiator, thereby improving the cooling performance of the pumping hydraulic system, in addition, when the oil return pressure of the oil return port of the main reversing valve is larger than the preset pressure, the pressure switch valve arranged on the first oil return path is opened, most of the oil return can directly return to the oil tank through the pressure switch valve, thereby preventing the high-pressure oil return from directly entering the radiator while realizing the oil return cooling, the radiator is prevented from being damaged by long-time impact of high-pressure return oil, so that the use reliability of the radiator is effectively improved.
According to the utility model discloses an embodiment, the pressure switch valve is back pressure valve or overflow valve.
According to the pumping hydraulic system of the embodiment of the present invention, the pressure switch valve may preferably be a back pressure valve or an overflow valve, wherein the back pressure valve is actuated by the elastic force of the built-in spring, that is, when the system pressure is lower than a predetermined pressure, the diaphragm blocks the oil return path under the action of the elastic force of the spring, when the system pressure is higher than the predetermined pressure, the diaphragm compresses the spring, the oil return path is connected, and the oil return flows into the oil tank through the back pressure valve; and for the overflow valve, when the system pressure is higher than the preset pressure, the overflow valve is opened at the moment, so that the redundant flow overflows back to the oil tank. Therefore, high-pressure return oil can be effectively prevented from directly entering the radiator, the radiator is prevented from being damaged by long-time impact of the high-pressure return oil, and the use reliability of the radiator is effectively improved.
According to the utility model discloses an embodiment, be provided with the ooff valve on the second oil return way, the ooff valve is connected the oil return opening of main reversing valve with between the radiator.
According to the utility model discloses a pump sending hydraulic system through set up the ooff valve on the second oil return way, makes between its oil return opening and the radiator that is connected to the main change valve, can set up the predetermined condition and close this ooff valve to cut off the oil circuit that the oil return got into the radiator, realize the function of similar OR door, thereby can effectively protect the radiator.
According to an embodiment of the present invention, the switch valve is a hydraulic control switch valve or an electric control switch valve.
According to the utility model discloses a pump sending hydraulic system, the ooff valve can be for the liquid accuse ooff valve through hydraulic pressure's big or small control switch state, also can be for the automatically controlled ooff valve through electromagnetic signal control, can close when predetermineeing pressure in order to cut off the oil circuit that gets into the radiator can.
According to the utility model discloses an embodiment, the liquid accuse ooff valve is the cartridge valve, the automatically controlled ooff valve is the solenoid valve.
According to the pumping hydraulic system of the embodiment of the utility model, the hydraulic control switch valve can be preferably a cartridge valve to be combined with the hydraulic control valve to realize the on-off of the oil path, and the cartridge valve has the advantages of sensitive action, good sealing performance and large flow area, and can effectively prevent the return oil from leaking into the oil path of the radiator, thereby realizing the effective protection of the radiator; the electric control switch valve is preferably an electromagnetic valve in the electric control reversing system, so that a corresponding electric control signal is generated according to the magnitude relation between the system pressure and the preset pressure to control the on-off state, and further the on-off control of an oil way is realized.
According to the utility model discloses an embodiment, the ooff valve is the liquid accuse ooff valve, auto-change over device still includes the shuttle valve, the exit linkage of shuttle valve to the control port of ooff valve, the first import and the second import of shuttle valve are connected respectively first master cylinder with the switching-over control oil circuit or the switching-over signal oil circuit of second master cylinder.
According to the utility model discloses a pump sending hydraulic system, when the ooff valve is the pilot operated switch valve, for the convenience of realization return oil circuit's the on-off control to the second, auto-change over device still includes hydraulic control valve shuttle valve, its exit linkage to ooff valve's control port, the import is connected to the switching-over control oil circuit or the signal oil circuit of first master cylinder and second master cylinder respectively, with according to the on-off state of received control oil or signal oil control pilot operated switch valve when first master cylinder and second master cylinder switching-over, and then realize the protection to the radiator.
According to an embodiment of the present invention, the second end of the first master cylinder is provided with a first differential pressure signal valve, and the second end of the second master cylinder is provided with a second differential pressure signal valve; and a first inlet of the shuttle valve is connected with the signal oil output port of the first differential pressure signal valve, and a second inlet of the shuttle valve is connected with the signal oil output port of the second differential pressure signal valve.
According to the embodiment of the present invention, the pumping hydraulic system further comprises a first differential pressure signal valve and a second differential pressure signal valve respectively disposed at the second ends of the first master cylinder and the second master cylinder, specifically, the inlet of the shuttle valve is connected to the signal oil output ports of the first differential pressure signal valve and the second differential pressure signal valve respectively to form a reversing signal oil path, so as to realize the circulation of hydraulic oil between the master cylinder and the switching device, i.e. when the first master cylinder or the second master cylinder operates to the reversing signal position, the first differential pressure signal valve or the second differential pressure signal valve can make the signal oil sequentially pass through the inlet and the outlet of the shuttle valve and be conveyed to the hydraulic control switch valve, and control the hydraulic control switch valve to close, thereby cutting off the return oil of the first master cylinder or the second master cylinder from entering the oil path of the radiator, and avoiding the damage to the radiator caused by the instant pressure generated when the master cylinder operates to the reversing signal, thereby prolonging the service life of the radiator.
According to the utility model discloses an embodiment, the ooff valve is the automatically controlled ooff valve, the automatically controlled ooff valve is used for the basis first master cylinder with the switching-over control signal control of second master cylinder the break-make of second oil return way, perhaps, the automatically controlled ooff valve is used for the basis the export pressure control of the oil return opening of main switching-over valve the break-make of second oil return way.
According to the utility model discloses a pump sending hydraulic system, when auto-change over device's ooff valve was the automatically controlled ooff valve, its switching-over control signal according to first master cylinder and second master cylinder or according to the break-make of the export pressure control second oil return way of the oil return opening of main reversing valve specifically, and then avoids the oil return to get into the oil circuit of radiator to make the radiator can not damage because of the pressure in the twinkling of an eye that the master cylinder produced when moving to the switching-over signal, prolong the life of radiator.
According to the utility model discloses an embodiment, the value range of predetermined pressure does: 2bar to 10 bar.
According to the utility model discloses a pump sending hydraulic system sets up the predetermined pressure value to 2bar ~ 10bar, can guarantee in time to open the pressure switch valve and divide an oil return branch road (first oil return way promptly) to make the oil return pressure of first master cylinder or second master cylinder can not exert an influence to the radiator, thereby can protect the radiator when carrying out the refrigerated to the oil return, improve the use reliability that is used for pump sending hydraulic system.
According to an embodiment of the second aspect of the present invention, a concrete pump truck is provided, comprising the pumping hydraulic system according to any one of the above technical solutions.
According to the concrete pump truck of the embodiment of the utility model, by using any one of the above technical schemes to pump the hydraulic system, on one hand, the return oil of the first master cylinder or the second master cylinder can be cooled through the radiator; on the other hand, by arranging the pressure switch valve, when the return oil pressure is greater than the preset value, the return oil can directly enter the oil tank through the pressure switch valve, so that the heat dissipation is not damaged due to overhigh return oil pressure; on the other hand, by arranging the first differential pressure signal valve and the second differential pressure signal valve, the switching valve can be closed when the first main oil cylinder and the second main oil cylinder run to the reversing signal position, so that all return oil directly flows into the oil tank, and the damage of the radiator caused by the instant pressure generated on the radiator is prevented; namely, the concrete pump truck has all the beneficial effects of the pumping hydraulic system.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a prior art pumped hydraulic system;
fig. 2 is a schematic structural diagram of a pumping hydraulic system according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 and fig. 2 is:
11 by-pass valves, 21 first master cylinders, 22 second master cylinders, 23 master directional control valves, 24 hydraulic pressure sources, 25 switching devices, 252 pressure switching valves, 254 switching valves, 256 shuttle valves, 26 tanks, 27 radiators, 28 first differential pressure signal valves, and 29 second differential pressure signal valves.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A pumping hydraulic system provided according to an embodiment of the present invention is described below with reference to fig. 2.
According to an embodiment of the first aspect of the present invention, a pumping hydraulic system is provided, including: a first master cylinder 21, a second master cylinder 22, and a master directional control valve 23; wherein, an inlet of the main directional control valve 23 is connected to a hydraulic source 24, a first working port and a second working port of the main directional control valve 23 are respectively connected to first ends of the first main cylinder 21 and the second main cylinder 22, and an oil return port of the main directional control valve 23 is connected to an oil tank 26 through a switching device 25; the switching device 25 includes a first oil return path on which a pressure switch valve 252 is provided, the pressure switch valve 252 being opened at a predetermined pressure, and a second oil return path connected to the oil tank 26 through a radiator 27.
According to the pumping hydraulic system of the embodiment of the present invention, the hydraulic source 24 is used for providing hydraulic oil, specifically an oil pump, for the first master cylinder 21 and the second master cylinder 22, and the oil return port of the master directional control valve 23 is connected to the oil tank 26 through the switching device 25, wherein the switching device 25 includes a first oil return path provided with the pressure switch valve 252 opened under a predetermined pressure and a second oil return path connected to the oil tank 26 through the radiator 27, and then a part of the return oil of the first master cylinder 21 or the second master cylinder 22 can be introduced into the radiator 27 through the second oil return path of the switching device 25 and then flows into the oil tank 26 after being cooled by the radiator 27, so as to improve the cooling performance of the pumping hydraulic system, and in addition, when the oil return pressure of the oil return port of the master directional control valve 23 is greater than the predetermined pressure, the pressure switch valve 252 provided on the first oil return path is completely opened, most of the return oil can directly return to the oil tank 26 through the pressure switch valve 252, so that the return oil is cooled, high-pressure return oil is prevented from directly entering the radiator 27, the radiator 27 is prevented from being damaged by long-time impact of the high-pressure return oil, and the use reliability of the radiator 27 is effectively improved.
According to an embodiment of the present invention, the pressure switch valve 252 is a back pressure valve or an overflow valve.
According to the pumping hydraulic system of the embodiment of the present invention, the pressure switch valve 252 may preferably be a back pressure valve or an overflow valve, wherein the back pressure valve is actuated by the elastic force of the built-in spring, that is, when the system pressure is lower than the predetermined pressure, the diaphragm blocks the oil return path under the action of the elastic force of the spring, when the system pressure is higher than the predetermined pressure, the diaphragm compresses the spring, the oil return path is connected, and the oil return flows into the oil tank 26 through the back pressure valve; for a relief valve, when the system pressure is greater than a predetermined pressure, the relief valve opens to allow excess flow to escape back to tank 26. Thus, the high-pressure return oil can be effectively prevented from directly entering the radiator 27, and the radiator 27 is prevented from being damaged by the impact of the high-pressure return oil for a long time, so that the use reliability of the radiator 27 is effectively improved.
According to an embodiment of the present invention, a switch valve 254 is disposed on the second oil return path, and the switch valve 254 is connected between the oil return port of the main directional control valve 23 and the radiator 27.
According to the utility model discloses a pump sending hydraulic system, through set up ooff valve 254 on the second oil return way, make it be connected to between main reversing valve 23's oil return opening and radiator 27 to and close this ooff valve 254 when the oil return pressure through main reversing valve 23's oil return opening is greater than predetermined pressure, thereby cut off the oil circuit that the oil return got into radiator 27, realize similar or the function of door, thereby can effectively protect radiator 27.
According to an embodiment of the present invention, the switch valve 254 is a hydraulic switch valve or an electric switch valve.
According to the utility model discloses a pump sending hydraulic system, ooff valve 254 can be for the liquid accuse ooff valve through hydraulic pressure's big or small control switch state, also can be for the automatically controlled ooff valve through electromagnetic signal control, can close in order to cut off the oil circuit that gets into radiator 27 at the preset condition can.
According to the utility model discloses an embodiment, the liquid accuse ooff valve is the cartridge valve, the automatically controlled ooff valve is the solenoid valve.
According to the pumping hydraulic system of the embodiment of the present invention, the hydraulic control switch valve may preferably be a cartridge valve to be used in combination with the hydraulic control valve to realize on/off of the oil path, and the cartridge valve has the advantages of sensitive action, good sealing performance and large flow area, and can effectively prevent the return oil from leaking into the oil path of the radiator 27, thereby realizing effective protection of the radiator 27; the electric control switch valve is preferably an electromagnetic valve in the electric control reversing system, so that a corresponding electric control signal is generated according to the magnitude relation between the system pressure and the preset pressure to control the on-off state, and further the on-off control of an oil way is realized.
According to an embodiment of the present invention, the switch valve 254 is a hydraulic control switch valve, the switching device 25 further includes a shuttle valve 256, an outlet of the shuttle valve 256 is connected to a control port of the switch valve, a first inlet and a second inlet of the shuttle valve 256 are respectively connected to the first master cylinder 21 and the reversing control oil path or the reversing signal oil path of the second master cylinder 22.
According to the utility model discloses a pump sending hydraulic system, when ooff valve 254 is the pilot operated switch valve, in order to facilitate the realization to the second return oil circuit the control of making or breaking, auto-change over device 25 still includes hydraulic control valve shuttle valve 256, its exit linkage to ooff valve 254's control mouth, the import is connected to first master cylinder 21 and second master cylinder 22's switching-over control oil circuit or switching-over signal oil circuit respectively, according to the on-off state of received control oil or signal oil control pilot operated switch valve when with first master cylinder 21 and second master cylinder 22 switching-over, and then realize the protection to radiator 27.
According to an embodiment of the present invention, the second end of the first master cylinder 21 is provided with a first differential pressure signal valve 28, and the second end of the second master cylinder 22 is provided with a second differential pressure signal valve 29; a first inlet of the shuttle valve 256 is connected to the signal oil output port of the first differential pressure signal valve 28, and a second inlet of the shuttle valve 256 is connected to the signal oil output port of the second differential pressure signal valve 29.
According to the embodiment of the present invention, the pumping hydraulic system further includes a first differential pressure signal valve 28 and a second differential pressure signal valve 29 respectively disposed at the second ends of the first main cylinder 21 and the second main cylinder 22, specifically, the inlet of the shuttle valve 256 is connected to the signal oil output ports of the first differential pressure signal valve 28 and the second differential pressure signal valve 29 respectively to form a reversing signal oil path, so as to realize the circulation of the hydraulic oil between the main cylinders and the switching device 25, that is, when the first main cylinder 21 or the second main cylinder 22 runs to the reversing signal position, the first differential pressure signal valve 28 or the second differential pressure signal valve 29 can enable the signal oil to pass through the inlet and the outlet of the shuttle valve 256 to be conveyed to the hydraulic control switch valve, and control the hydraulic control switch valve to close, thereby cutting off the return oil of the first main cylinder 21 or the second main cylinder 22 to enter the oil path of the radiator 27, and avoiding the damage to the radiator 27 caused by the instantaneous pressure generated when the main cylinders run to the reversing signal, thereby extending the life of the heat sink 27.
According to the utility model discloses an embodiment, ooff valve 254 is the automatically controlled ooff valve, the automatically controlled ooff valve is used for the basis first master cylinder 21 with the switching-over control signal control of second master cylinder 22 the break-make of second oil return way, perhaps, the automatically controlled ooff valve is used for the basis the outlet pressure control of the oil return opening of main change-over valve 23 the break-make of second oil return way.
According to the utility model discloses a pump sending hydraulic system, when switching device 25's ooff valve 254 was the automatically controlled ooff valve, it specifically according to the switching-over control signal of first master cylinder 21 and second master cylinder 22 or according to the break-make of the export pressure control second oil return way of the oil return opening of main change-over valve 23, and then avoids the oil return to get into radiator 27's oil circuit to make radiator 27 can not damage because of the pressure in the twinkling of an eye that the master cylinder produced when moving to the switching-over signal, prolong radiator 27's life.
According to the utility model discloses an embodiment, the value range of predetermined pressure does: 2bar to 10 bar.
According to the utility model discloses a pump sending hydraulic system sets up predetermined pressure value to 2bar ~ 10bar, if 3bar, 4bar, 5bar, 6bar, 7bar, 8bar, 9bar, specifically select according to hydraulic system's structure and radiator's requirement, can guarantee in time to open pressure switch valve 252 and divide an oil return branch road (first oil return way promptly), so that the oil return pressure of first master cylinder 21 or second master cylinder 22 can not exert an influence to radiator 27, thereby can protect radiator 27 when carrying out the refrigerated to the oil return, improve the use reliability who is used for pump sending hydraulic system.
According to an embodiment of the second aspect of the present invention, a concrete pump truck is provided, comprising the pumping hydraulic system according to any one of the above technical solutions.
According to the concrete pump truck of the embodiment of the present invention, by using any one of the above-mentioned technical solutions to pump the hydraulic system, on one hand, the return oil of the first master cylinder 21 or the second master cylinder 22 can be cooled by the radiator 27; on the other hand, by the pressure switch valve 252, when the return oil pressure is greater than the preset value, the return oil can directly enter the oil tank 26 through the pressure switch valve 252, and it is ensured that the heat dissipation is not damaged due to the overhigh return oil pressure; on the other hand, by arranging the first differential pressure signal valve 28 and the second differential pressure signal valve 29, when the first main oil cylinder 21 and the second main oil cylinder 22 run to the reversing signal position, the switch valve 254 can be closed, all return oil directly flows into the oil tank 26, and damage to the radiator 27 caused by instant pressure generated on the radiator 27 is prevented; namely, the concrete pump truck has all the beneficial effects of the pumping hydraulic system.
In the description of the present specification, the terms "disposed", "connected", and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present specification, the description of the terms "one embodiment," "a specific embodiment," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A pumped hydraulic system, comprising: a first main oil cylinder (21), a second main oil cylinder (22) and a main reversing valve (23); wherein,
an inlet of the main reversing valve (23) is connected to a hydraulic source (24), a first working port and a second working port of the main reversing valve (23) are respectively connected to first ends of the first main oil cylinder (21) and the second main oil cylinder (22), and an oil return port of the main reversing valve (23) is connected to an oil tank (26) through a switching device (25);
the switching device (25) comprises a first oil return path and a second oil return path, wherein a pressure switch valve (252) is arranged on the first oil return path, the pressure switch valve (252) is opened under preset pressure, and the second oil return path is connected to the oil tank (26) through a radiator (27).
2. The pumped hydraulic system of claim 1, characterized in that the pressure switch valve (252) is a back pressure valve or an overflow valve.
3. A pumped hydraulic system according to claim 1, characterized in that a switch valve (254) is arranged on the second oil return, said switch valve (254) being connected between the oil return of the main directional control valve (23) and the radiator (27).
4. The pumped hydraulic system of claim 3, wherein the switching valve (254) is a pilot-controlled switching valve or an electrically-controlled switching valve.
5. The pumped hydraulic system of claim 4, wherein the pilot-operated switching valve is a cartridge valve and the electronically-controlled switching valve is a solenoid valve.
6. The pumped hydraulic system of claim 4, wherein the on-off valve (254) is a pilot-controlled on-off valve, the switching device (25) further comprises a shuttle valve (256), an outlet of the shuttle valve (256) is connected to a control port of the on-off valve (254), and a first inlet and a second inlet of the shuttle valve (256) are connected to the direction-change control oil path or the direction-change signal oil path of the first master cylinder (21) and the second master cylinder (22), respectively.
7. Pumping hydraulic system according to claim 6, characterized in that a second end of the first master cylinder (21) is provided with a first differential pressure signal valve (28) and a second end of the second master cylinder (22) is provided with a second differential pressure signal valve (29);
the first inlet of the shuttle valve (256) is connected with the signal oil output port of the first differential pressure signal valve (28), and the second inlet of the shuttle valve (256) is connected with the signal oil output port of the second differential pressure signal valve (29).
8. The pumped hydraulic system of claim 4, wherein the switch valve (254) is an electrically controlled switch valve for controlling the second oil return according to the direction change control signals of the first master cylinder (21) and the second master cylinder (22), or controlling the second oil return according to the outlet pressure of the oil return port of the master directional control valve (23).
9. A pumped hydraulic system as claimed in any one of claims 1 to 8, wherein the predetermined pressure is in the range: 2bar to 10 bar.
10. A concrete pump truck, characterized by comprising: the pumped hydraulic system of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520989418.XU CN205136238U (en) | 2015-12-02 | 2015-12-02 | Pump sending hydraulic system and mobile concrete pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520989418.XU CN205136238U (en) | 2015-12-02 | 2015-12-02 | Pump sending hydraulic system and mobile concrete pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205136238U true CN205136238U (en) | 2016-04-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520989418.XU Active CN205136238U (en) | 2015-12-02 | 2015-12-02 | Pump sending hydraulic system and mobile concrete pump |
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| Country | Link |
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| CN (1) | CN205136238U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298996A (en) * | 2015-12-02 | 2016-02-03 | 湖南三一路面机械有限公司 | Pumping hydraulic system and concrete pump truck |
| CN108591147A (en) * | 2018-04-09 | 2018-09-28 | 广西柳工机械股份有限公司 | Quarry tipper constant pressure determines variable delivery hydraulic system |
| CN109958675A (en) * | 2019-03-01 | 2019-07-02 | 北汽福田汽车股份有限公司 | Concrete pumping equipment and its hydraulic control system |
-
2015
- 2015-12-02 CN CN201520989418.XU patent/CN205136238U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298996A (en) * | 2015-12-02 | 2016-02-03 | 湖南三一路面机械有限公司 | Pumping hydraulic system and concrete pump truck |
| CN105298996B (en) * | 2015-12-02 | 2017-09-22 | 湖南三一路面机械有限公司 | Hydraulic system of pump and concrete mixer |
| CN108591147A (en) * | 2018-04-09 | 2018-09-28 | 广西柳工机械股份有限公司 | Quarry tipper constant pressure determines variable delivery hydraulic system |
| CN109958675A (en) * | 2019-03-01 | 2019-07-02 | 北汽福田汽车股份有限公司 | Concrete pumping equipment and its hydraulic control system |
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