CN215171112U - Hydraulic system for concrete pump truck and concrete pump truck - Google Patents
Hydraulic system for concrete pump truck and concrete pump truck Download PDFInfo
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- CN215171112U CN215171112U CN202023248639.1U CN202023248639U CN215171112U CN 215171112 U CN215171112 U CN 215171112U CN 202023248639 U CN202023248639 U CN 202023248639U CN 215171112 U CN215171112 U CN 215171112U
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Abstract
The utility model provides a hydraulic system and concrete pump truck for concrete pump truck, this hydraulic system includes master cylinder, signal valves, overflow valves, first oil source, second oil source, oil tank and energy storage ware, first oil source and master cylinder intercommunication; the signal valve group is arranged between the main oil cylinder and the overflow valve group; the second oil source can be communicated with a rod cavity of the main oil cylinder, and an energy accumulator is arranged between the second oil source and the main oil cylinder; after a piston of the main oil cylinder moves to a preset position towards a rodless cavity of the main oil cylinder, the main oil cylinder sends signal oil to an overflow valve group through a signal valve group, so that the overflow valve group overflows, and the oil pressure provided by a first oil source to the rodless cavity of the main oil cylinder is smaller than the oil pressure provided by a second oil source and an energy accumulator; after the rod cavity of the main oil cylinder is communicated with the second oil source and the energy accumulator, the oil pressure of the rod cavity of the main oil cylinder is larger than that of the rodless cavity of the main oil cylinder. According to the hydraulic system, under the condition that the electromagnetic valve fails, the master cylinder can complete retraction, and the reliability of the hydraulic system is improved.
Description
Technical Field
The utility model relates to a mobile concrete pump technical field specifically, relates to a hydraulic system and mobile concrete pump for mobile concrete pump.
Background
The hydraulic system of the existing concrete pump truck comprises an overflow valve group, the overflow valve group is provided with an electromagnetic valve, a first oil source provides normal oil pressure for the hydraulic system under the condition that the electromagnetic valve is electrified, and the hydraulic system is in a decompression state under the condition that the electromagnetic valve is not electrified. In the hydraulic system of the existing concrete pump truck, the piston of the main oil cylinder can only move to the bottom wall of the rodless cavity of the main oil cylinder to finish retraction under the condition that the electromagnetic valve is not electrified, and the retraction can not be finished under the condition that the electromagnetic valve is in failure, so that the reliability of the system is reduced.
SUMMERY OF THE UTILITY MODEL
The above-mentioned defect or not enough to prior art, the utility model provides a hydraulic system and mobile concrete pump for mobile concrete pump can avoid making the piston of master cylinder can't roll back because of the solenoid valve trouble, makes hydraulic system more reliable and more stable.
In order to achieve the above object, the present invention provides, in a first aspect, a hydraulic system for a concrete pump truck, the hydraulic system including a master cylinder, a signal valve group, an overflow valve group, a first oil source, a second oil source, an oil tank, and an accumulator,
the first oil source is communicated with the main oil cylinder;
the signal valve group is arranged between the main oil cylinder and the overflow valve group;
the second oil source can be communicated with the rod cavity of the main oil cylinder, and the energy accumulator is arranged between the second oil source and the main oil cylinder;
after a piston of the main oil cylinder moves to a preset position towards a rodless cavity of the main oil cylinder, the main oil cylinder sends signal oil to an overflow valve group through a signal valve group, so that the overflow valve group overflows, and the oil pressure provided by a first oil source to the rodless cavity of the main oil cylinder is smaller than the oil pressure provided by a second oil source and an energy accumulator;
after the rod cavity of the main oil cylinder is communicated with the second oil source and the energy accumulator, the oil pressure of the rod cavity of the main oil cylinder is larger than that of the rodless cavity of the main oil cylinder.
Optionally, the master cylinder includes a first master cylinder and a second master cylinder, the signal valve group includes a first signal valve group and a second signal valve group, and the overflow valve group includes a first control port and a second control port;
the first signal valve bank is arranged between the first main oil cylinder and the overflow valve bank, and the second signal valve bank is arranged between the second main oil cylinder and the overflow valve bank;
the first main oil cylinder transmits signal oil to the first control port through the first signal valve group, and the second main oil cylinder transmits signal oil to the second control port through the second signal valve group.
Optionally, the rod chamber of the first master cylinder can communicate with the rod chamber of the second master cylinder, and the rodless chamber of the first master cylinder can communicate with the rodless chamber of the second master cylinder.
Optionally, the rod chamber of the second master cylinder is in communication with a second source of oil and the accumulator via a ball valve.
Optionally, a rodless cavity of the first master cylinder is provided with a first limit cylinder, a rodless cavity of the second master cylinder is provided with a second limit cylinder, and the first limit cylinder and the second limit cylinder can be communicated with an oil tank or a second oil source.
Optionally, the hydraulic system further comprises a concrete withdrawing valve bank, the concrete withdrawing valve bank is arranged between the first limiting oil cylinder and the second limiting oil cylinder, and the first limiting oil cylinder and the second limiting oil cylinder are communicated with the oil tank or the second oil source through the concrete withdrawing valve bank.
Optionally, the concrete withdrawing valve group comprises a two-position four-way solenoid valve and a check valve, the two-position four-way solenoid valve comprises a first connecting port, a second connecting port and a third connecting port, the check valve is arranged between the first connecting port and the second oil source, the second connecting port is communicated with the oil tank, and the third connecting port is communicated with the first limiting oil cylinder and the second limiting oil cylinder.
Optionally, the rodless cavity of the first master cylinder and the rodless cavity of the second master cylinder are connected through a rodless cavity communication valve bank, and the rodless cavity communication valve bank is used for controlling communication between the rodless cavity of the first master cylinder and the rodless cavity of the second master cylinder.
Optionally, the rodless cavity communicating valve group comprises a first cartridge valve and a second cartridge valve, the first cartridge valve comprises a first main oil port, a second main oil port and a third control port, and the second cartridge valve comprises a third main oil port, a fourth main oil port and a fourth control port;
the first main oil port and the third main oil port are communicated and communicated with a rodless cavity of the first main oil cylinder, the second main oil port and the fourth main oil port are communicated and communicated with a rodless cavity of the second main oil cylinder, and the third control port and the fourth control port are selectively communicated with a second oil source.
The utility model discloses the second aspect provides a concrete pump truck, including foretell a hydraulic system for concrete pump truck.
Through the technical scheme, after the piston of master cylinder moved to predetermined position towards master cylinder rodless chamber, overflow valves work and reduced the oil pressure of first oil supply, thereby make the oil pressure in the rodless chamber of master cylinder reduce, even under the state that the solenoid valve was electrified, the staff only need with the master cylinder have the pole chamber with second oil supply intercommunication and energy storage ware intercommunication back, also can make the master cylinder have the state that the oil pressure in pole chamber maintains to be greater than the master cylinder rodless chamber, thereby make the piston of hydro-cylinder return to the diapire in master cylinder rodless chamber, so set up, under the condition of solenoid valve trouble, also can make the master cylinder accomplish to roll back, make hydraulic system more firm.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of a hydraulic system for a concrete pump truck according to an embodiment of the present invention;
fig. 2 is a schematic view of a connection relationship between a signal valve set and a master cylinder according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a hydraulic principle of an overflow valve group according to an embodiment of the present invention;
fig. 4 is a schematic view of a hydraulic principle of a rodless chamber communication valve set according to an embodiment of the present invention;
fig. 5 is a hydraulic principle schematic diagram of a concrete valve group according to an embodiment of the present invention.
Description of reference numerals: a master cylinder 1; a first master cylinder 1'; a second master cylinder 1 "; a first outlet 1 a; a second outlet 1 b; a third outlet 1 c; a signal valve group 2; a first signal valve group 2'; a second signal valve group 2 "; an overflow valve group 3; a first control port 3 a'; a second control port 3a "; the main cartridge valve 31; a diverter valve 32; a buffer relief valve 33; a main relief valve 34; an electromagnetic valve 35; a first pilot oil passage X; a second pilot oil passage Y; a first limit oil cylinder 4'; a second limit cylinder 4 "; the rodless cavity is communicated with the valve group 5; the first cartridge valve 51; a second cartridge valve 52; a first main oil port 511; a second main oil port 512; a third control port 513; a third main oil port 521; a fourth main oil port 522; a fourth control port 523; a concrete withdrawing valve group 6; a two-position four-way solenoid valve 61; a check valve 62; a first connection port 611; a second connection port 612; a third connection port 613; an accumulator 7; a ball valve 8; a three-position four-way solenoid valve 9; a third cartridge valve A; a tank T0; first low-pressure oil passage L1; second low-pressure oil passage L2; first high-pressure oil passage H1; second high-pressure oil passage H2; a first source of oil P1; a second source of oil P2.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is only intended to illustrate and explain embodiments of the present invention, and is not intended to limit embodiments of the present invention.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the embodiments of the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, top, bottom" and "upper" are generally used with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, vertical or gravitational direction.
The invention will be described in detail below with reference to the accompanying drawings in conjunction with exemplary embodiments.
As shown in fig. 1, an exemplary embodiment of the present invention provides a hydraulic system for a concrete pump truck, which includes a master cylinder 1, a signal valve set 2, an overflow valve set 3, a first oil source P1, a second oil source P2, an oil tank T0 and an accumulator 7, wherein the first oil source P1 is communicated with the master cylinder 1; the signal valve group 2 is arranged between the main oil cylinder 1 and the overflow valve group 3; the second oil source P2 can be communicated with the rod cavity of the main oil cylinder 1, and the accumulator 7 is arranged between the second oil source P2 and the main oil cylinder 1; after a piston of a main oil cylinder 1 moves to a preset position towards a rodless cavity of the main oil cylinder 1, the main oil cylinder 1 sends signal oil to an overflow valve group 3 through a signal valve group 2, so that the overflow valve group 3 overflows, and the oil pressure provided by a first oil source P1 to the rodless cavity of the main oil cylinder 1 is smaller than the oil pressure provided by a second oil source P2 and an energy accumulator 7; after the rod cavity of the master cylinder 1 is communicated with the second oil source P2 and the accumulator 7, the oil pressure of the rod cavity of the master cylinder is larger than that of the rodless cavity of the master cylinder.
As shown in fig. 2, specifically, the master cylinder 1 of the present embodiment is provided with a first outlet 1a, a second outlet 1b, and a third outlet 1c on the cylinder wall. The third outlet 1c is close to the bottom wall of the rodless chamber of the master cylinder 1, the first outlet 1a and the second outlet 1b are located on the side of the third outlet 1c away from the bottom wall of the rodless chamber of the master cylinder 1, the second outlet 1b is located between the first outlet 1a and the third outlet 1c, and the preset position is located between the second outlet 1b and the third outlet 1 c. The first outlet 1a, the second outlet 1b and the third outlet 1c are respectively communicated with the signal valve group 2. After the piston 11 of the master cylinder moves towards the rodless cavity of the master cylinder 1 to cross the second outlet 1b, the rod cavity of the master cylinder 1 is communicated with the second outlet 1b, and the second outlet 1b is communicated with the signal valve group 2. Both the hydraulic oil in the rod cavity of the master cylinder 1 and the hydraulic oil in the rodless cavity of the master cylinder 1 can flow into the signal valve block 2, so that the oil pressure of the rod cavity and the oil pressure of the rodless cavity can be compared in pressure in the signal valve block 2. When the piston 11 of the main oil cylinder 1 moves to a preset position in the direction of the rodless cavity of the main oil cylinder 1, the pressure ratio of the oil pressure of the rod cavity to the oil pressure of the rodless cavity in the signal valve group reaches the opening ratio of the signal valve group 2, the main oil cylinder 1 sends signal oil to the overflow valve group 3 through the signal valve group 2, so that the overflow valve group 3 overflows, the oil pressure generated by the first oil source P1 is reduced, and therefore the oil pressure provided by the first oil source P1 to the rodless cavity of the main oil cylinder is reduced.
As shown in fig. 3, specifically, the relief valve group 3 of the present embodiment includes a main cartridge valve 31, a selector valve 32, a cushion relief valve 33, a main relief valve 34, a first pilot oil passage X, and a second pilot oil passage Y. One end of the first pilot oil passage X communicates with the first oil source P1, and one end of the second pilot oil passage Y communicates with the oil tank T0. The buffer overflow valve 33 and the main overflow valve 34 are connected in parallel between the first pilot oil path X and the second pilot oil path Y, the set pressure of the buffer overflow valve 33 is smaller than the set pressure of the main overflow valve 34, the reversing valve 32 is connected in series with the buffer overflow valve 33 and located at the upstream of the buffer overflow valve 33, and the main cylinder 1 is selectively communicated with the control port of the reversing valve 32 through the signal valve group 2, that is, the control port of the reversing valve 32 is the control port of the overflow valve group 3. The first main port of the main cartridge valve 31 communicates with a first oil source P1, the second main port of the main cartridge valve 31 communicates with an oil tank T0, and the control port of the main cartridge valve 31 communicates with the first pilot oil passage X.
The hydraulic system of the present embodiment operates in an electro-hydraulic control manner, and the overflow valve group 3 further includes an electromagnetic valve 35, and the electromagnetic valve 35 is connected in parallel between the first pilot oil path X and the second pilot oil path Y. When the electromagnetic valve 35 is in a power-off state, the electromagnetic valve 35 communicates the first pilot oil path X and the second pilot oil path Y, the hydraulic oil flowing into the first pilot oil path X from the first oil source P1 flows back to the oil tank T0 through the second pilot oil path Y, the hydraulic system is in a pressure-off state, and at this time, the piston of the master cylinder 1 can only retract to the bottom wall of the master cylinder rodless cavity, that is, the piston of the master cylinder 1 can only retract to the bottom wall of the master cylinder rodless cavity when the electromagnetic valve 35 is not powered.
In this embodiment, after the staff only needs to communicate the rod cavity of the master cylinder 1 with the second oil source P2 and the accumulator 7, the staff can also make the oil pressure of the rod cavity of the master cylinder maintain a state larger than the rodless cavity of the master cylinder, so as to make the piston of the master cylinder 1 retract to the bottom wall of the rodless cavity of the master cylinder, and thus, in the case of failure of the electromagnetic valve 35, the master cylinder 1 can also complete retraction, so that the hydraulic system is more stable.
The pumping equipment described in this embodiment belongs to double-cylinder pumping equipment, and the pumping equipment comprises a pump truck, a vehicle-mounted pump and a trailer pump, and mainly adopts two main oil cylinders 1 to pump viscous materials alternately, and in the pumping process, a hydraulic oil in an oil tank T0 is pumped to the main oil cylinders 1 through a first oil source P1, so that the two main oil cylinders 1 can act in a coordinated manner.
As shown in fig. 1, in the embodiment of the present invention, the master cylinder 1 includes a first master cylinder 1' and a second master cylinder 1 ", the signal valve set 2 includes a first signal valve set 2' and a second signal valve set 2", and the overflow valve set 3 includes a first control port 3a ' and a second control port 3a "; the first signal valve group 2 'is arranged between the first main oil cylinder 1' and the overflow valve group 3, and the second signal valve group 2 'is arranged between the second main oil cylinder 1' and the overflow valve group 3; the first master cylinder 1 'transmits signal oil to the first control port 3a' through the first signal valve group 2', and the second master cylinder 1' transmits signal oil to the second control port 3a 'through the second signal valve group 2'.
Further, the rod cavity of the first master cylinder 1 'can be communicated with the rod cavity of the second master cylinder 1 ", and the rodless cavity of the first master cylinder 1' can be communicated with the rodless cavity of the second master cylinder 1".
As shown in fig. 1, specifically, the first oil source P1 and the oil tank T0 selectively communicate with the rodless chamber of the first master cylinder 1 'through a first high-pressure oil passage H1 and with the rod chamber of the first master cylinder 1' through a first low-pressure oil passage L1, respectively; the first oil source P1 and the oil tank T0 are selectively communicated with the rodless chamber of the second master cylinder 1 "through a second high-pressure oil passage H2, and selectively communicated with the rod chamber of the second master cylinder 1" through a second low-pressure oil passage L2, respectively.
The pumping mode is divided into a high-pressure pumping mode and a low-pressure pumping mode; when a low-pressure pumping mode is adopted, rodless cavities of the two main oil cylinders 1 are communicated, rod cavities of the two main oil cylinders 1 are separated, and the rod cavities of the two main oil cylinders 1 alternately feed oil and return oil; when a high-pressure pumping mode is adopted, the rod cavities of the two main oil cylinders 1 are communicated, the rodless cavities of the two main oil cylinders 1 are separated, the rodless cavities of the two main oil cylinders 1 alternately feed oil and return oil, and the two pumping modes can be selected according to actual use requirements.
As shown in fig. 1, in the high pressure pumping mode: when the rodless cavity of the first main oil cylinder 1 'is fed with oil through the first high-pressure oil way H1, the rodless cavity of the second main oil cylinder 1' is fed with oil to the oil tank T0 through the second high-pressure oil way H2, the piston of the second main oil cylinder 1 'moves towards the direction of the rodless cavity, when the piston of the second main oil cylinder 1' moves to a preset position, the second signal valve group 2 'is switched on, the second main oil cylinder 1' is communicated with the second control port 3a ', and the overflow valve group 3 overflows, so that the oil pressure of the rodless cavity of the first main oil cylinder 1' is greatly reduced. Similarly, when the rodless cavity of the second master cylinder 1 ″ is fed with oil through the second high-pressure oil path H2, the rodless cavity of the first master cylinder 1 'returns oil to the oil tank T0 through the first high-pressure oil path H1, the piston of the first master cylinder 1' moves in the direction of the rodless cavity, when the piston of the first master cylinder 1 'moves to a preset position, the first signal valve group 2' is switched on, the first master cylinder 1 'is communicated with the first control port 3a', and the overflow valve group 3 overflows, so that the oil pressure of the rodless cavity of the second master cylinder 1 ″ is greatly reduced.
As shown in fig. 3, the overflow valve group of the present embodiment includes a directional control valve 32 that is a three-position directional control valve 32, when neither the second signal valve group 2 ″ nor the first signal valve group 2' is conducted, the three-position directional control valve 32 is stopped at a middle position (O-type middle position function), the three-position directional control valve 32 disconnects the buffer overflow valve 33 from the first pilot oil path X, and the pressure of the first pilot oil path X is controlled by the main overflow valve 34; when the first signal valve set 2' is turned on, the three-position directional control valve 32 is at the upper position, and when the second signal valve set 2 ″ is turned on, the three-position directional control valve 32 is at the lower position. The three-position directional control valve 32 can communicate the cushion relief valve 33 with the first pilot oil passage X regardless of the upper position or the lower position. Since the set pressure of the relief/relief valve 33 is lower than the set pressure of the main relief/relief valve 34, the pressure of the first pilot oil passage X is controlled by the relief/relief valve 33 at this time.
Specifically, when the pressure of the inlet port of the relief valve 33 reaches the set pressure of the relief valve 33, the relief valve 33 is relieved, whereby the pressure of the first pilot oil passage X can be reduced. Meanwhile, since the control port of the main cartridge valve 31 is communicated with the first pilot oil passage X, when the pressure of the first pilot oil passage X is reduced, the spool of the main cartridge valve 31 is opened and oil is returned, so that the oil pressure supplied from the first oil source P1 to the first main cylinder 1 'or the second main cylinder 1 ″ is greatly reduced, and it can be understood that the change-over valve 32 is not limited to the three-position change-over valve 32, as long as the relief and relief valve 33 can be communicated with the first pilot oil passage X when the first signal valve group 2' or the second signal valve group 2 ″ is turned on.
Further, the rod chamber of the second master cylinder 1 "is in communication with a second source P2 and an accumulator 7 via a ball valve 8. As shown in fig. 1, specifically, the rod chamber of the second master cylinder 1 ″ is communicated with the second oil source P2, an accumulator 7 is provided on the oil passages of the second master cylinder 1 ″ and the second oil source P2, and a ball valve 8 is provided between the accumulator 7 and the second master cylinder 1 ″.
In a high-pressure pumping mode, a rod cavity of the first main oil cylinder 1' is communicated with a rod cavity of the second main oil cylinder 1', a rodless cavity of the first main oil cylinder 1' is separated from a rodless cavity of the second main oil cylinder 1', a worker opens the ball valve 8, and the second oil source P2 and the accumulator 7 are communicated with the rod cavity of the second main oil cylinder 1 '. For example, after the piston of the second master cylinder 1 "reaches the preset position, the second signal valve set 2" sends signal oil to the second control port 3a "to overflow the overflow valve set 3 to reduce the oil pressure of the first oil source P1, so that the oil pressure of the rodless cavity of the first master cylinder 1' and the oil pressure of the rodless cavity of the second master cylinder 1" are both reduced, and since the rod cavity of the second master cylinder 1 "is communicated with the second oil source P2 and the accumulator 7, the oil pressure of the rod cavity of the second master cylinder 1" is greater than the oil pressure of the rodless cavity of the second master cylinder 1 ". In addition, because the rod cavity of the second master cylinder 1' is communicated with the rod cavity of the first master cylinder 1', the oil pressure of the rod cavity of the first master cylinder 1' is also greater than the oil pressure of the rodless cavity of the first master cylinder 11, so that the piston of the first master cylinder 1' and the piston of the second master cylinder 1' both move towards the bottom wall of the rodless cavity, and the two master cylinders 1 complete retraction. Therefore, the hydraulic system can enable the two main oil cylinders 1 to finish the retraction by opening the ball valve 8 in a high-pressure mode, the situation that the main oil cylinders 1 cannot retract due to the failure of the electromagnetic valve 35 is avoided, and the stability of the hydraulic system is improved.
As shown in fig. 1, in the embodiment of the present invention, the rodless cavity of the first master cylinder 1' is provided with the first limit cylinder 4', the rodless cavity of the second master cylinder 1 "is provided with the second limit cylinder 4", and the first limit cylinder 4' and the second limit cylinder 4 "can communicate with the oil tank T0 or the second oil source P2.
As shown in fig. 1 and 5, the hydraulic system further includes a concrete-releasing valve group 6, the concrete-releasing valve group 6 is disposed between the first limit cylinder 4 'and the second limit cylinder 4 ″ and the second oil source P2, and the first limit cylinder 4' and the second limit cylinder 4 ″ are communicated with the oil tank T0 or the second oil source P2 through the concrete-releasing valve group 6.
As shown in fig. 1, specifically, a first limit cylinder 4 'and a second limit cylinder 4 "are respectively disposed in a rodless cavity of a first master cylinder 1' and a rodless cavity of a second master cylinder 1", and the limit cylinders play a role in forcibly protecting the master cylinder 1 when a piston of the master cylinder 1 moves toward the rodless cavity in the case of failure of a stroke limit switch.
The first limiting oil cylinder 4 'and the second limiting oil cylinder 4' are connected with a second oil source P2 and the oil cylinders through a concrete withdrawal valve group 6, under the operation condition of the hydraulic system, the second oil source P2 is communicated with the first limiting oil cylinder 4 'and the second limiting oil cylinder 4' to provide oil pressure for the hydraulic system, and after the hydraulic system stops operating, the first limiting oil cylinder 4 'and the second limiting oil cylinder 4' are communicated with an oil tank T0 to relieve the pressure, so that the piston of the main oil cylinder 1 finishes withdrawal.
As shown in fig. 5, the concrete-discharging valve group 6 further includes a two-position four-way solenoid valve 61 and a check valve 62, the two-position four-way solenoid valve 61 includes a first connection port 611, a second connection port 612 and a third connection port 613, the check valve 62 is disposed between the first connection port 611 and the second oil source P2, the second connection port 612 is communicated with the oil tank T0, and the third connection port 613 is communicated with the first limit cylinder 4' and the second limit cylinder 4 ″.
When the two-position four-way solenoid valve 61 is not energized, it is in the right position, and at this time, the first connection port 611 and the third connection port 613 are communicated, and the second oil source P2 is communicated with the first limit cylinder 4' and the second limit cylinder 4 ″ and supplies oil pressure thereto. When the two-position four-way solenoid valve 61 is powered on, the two-position four-way solenoid valve is positioned at the left position, at this time, the second connecting port 612 is communicated with the third connecting port 613, and the first limiting oil cylinder 4' and the second limiting oil cylinder 4 ″ are communicated with the oil tank T0 to complete pressure relief.
In the embodiment of the present invention, the rodless cavity of the first master cylinder 1 'and the rodless cavity of the second master cylinder 1 "are connected by the rodless cavity communicating valve set 5, and the rodless cavity communicating valve set 5 is used to control the communication between the rodless cavity of the first master cylinder 1' and the rodless cavity of the second master cylinder 1".
As shown in fig. 4, the rodless chamber communication valve group 5 further includes a first cartridge valve 51 and a second cartridge valve 52, the first cartridge valve 51 includes a first main port 511, a second main port 512 and a third control port 513, and the second cartridge valve 52 includes a third main port 521, a fourth main port 522 and a fourth control port 523;
the first and third main oil ports 511 and 521 are communicated with each other and communicate with a rodless chamber of the first main oil cylinder 1', the second and fourth main oil ports 512 and 522 are communicated with each other and communicate with a rodless chamber of the second main oil cylinder 1 ″, and the third and fourth control ports 513 and 523 are selectively communicated with the second oil source P2.
As shown in fig. 1, specifically, a rodless cavity communication valve set 5 is arranged between the rodless cavity of the first master cylinder 1 'and the rodless cavity of the second master cylinder 1 ″ to control the communication, and the rod cavity of the first master cylinder 1' and the rod cavity of the second master cylinder 1 ″ are controlled to communicate by a third cartridge valve a. A three-position four-way solenoid valve 9 is arranged between the rodless cavity communication valve group 5 and the first oil source P1 as well as between the third cartridge valve A and the first oil source P1.
When the three-position four-way solenoid valve 9 is in an upper position, the third control port 513 and the fourth control port 523 are communicated with the oil tank T0, the rodless cavity communication valve group 5 is opened, the first main oil port 511 is communicated with the third main oil port 521, the second main oil port 512 is communicated with the fourth main oil port 522, the rodless cavity of the first main oil cylinder 1 'is communicated with the first main oil port 511 and the third main oil port 521, and the rodless cavity of the second main oil cylinder 1 ″ is communicated with the second main oil port 512 and the fourth main oil port 522, so that the rodless cavity of the first main oil cylinder 1' is communicated with the rodless cavity of the second main oil cylinder 1 ″; the signal oil generated by the second oil source P2 is connected to the control port of the third cartridge valve A, so that the two main oil ports of the third cartridge valve A are closed, and the rod cavity of the first master cylinder 1 'is separated from the rod cavity of the second master cylinder 1'. At this time, the rodless cavity of the first master cylinder 1 'is communicated with the rodless cavity of the second master cylinder 1 ", the rod cavity of the first master cylinder 1' is separated from the rod cavity of the second master cylinder 1", and the hydraulic system is in a low-pressure pumping mode.
When the three-position four-way solenoid valve 9 is in the lower position, the third control port 513 and the fourth control port 523 are connected with signal oil generated by the second oil source P2, and the rodless cavity communicating valve group 5 is closed, so that the rodless cavity of the first main oil cylinder 1 'is separated from the rodless cavity of the second main oil cylinder 1'; the control port of the third cartridge valve A is connected with an oil tank T0, two main oil ports of the third cartridge valve A are opened, and a rod cavity of the first main oil cylinder 1 'is communicated with a rod cavity of the second main oil cylinder 1'. At this time, the rodless cavity of the first master cylinder 1 'is separated from the rodless cavity of the second master cylinder 1 ", the rod cavity of the first master cylinder 1' is communicated with the rod cavity of the second master cylinder 1", and the hydraulic system is in a high-pressure pumping mode.
Additionally, the utility model also provides a concrete pump truck, including foretell hydraulic system, consequently also have foretell advantage, do not do here and describe repeatedly.
The above describes in detail optional implementation manners of embodiments of the present invention with reference to the accompanying drawings, however, the embodiments of the present invention are not limited to the details in the above implementation manners, and in the technical concept scope of the embodiments of the present invention, it is possible to perform various simple modifications on the technical solutions of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that, in the above-mentioned embodiments, the various technical features described in the above-mentioned embodiments can be combined in any suitable way without contradiction, and in order to avoid unnecessary repetition, the embodiments of the present invention do not separately describe various possible combinations.
In addition, various different implementation manners of the embodiments of the present invention can be combined arbitrarily, and as long as it does not violate the idea of the embodiments of the present invention, it should be considered as the disclosure of the embodiments of the present invention.
Claims (10)
1. A hydraulic system for a concrete pump truck is characterized by comprising a main oil cylinder, a signal valve group, an overflow valve group, a first oil source, a second oil source, an oil tank and an energy accumulator;
the first oil source is communicated with the main oil cylinder;
the signal valve group is arranged between the main oil cylinder and the overflow valve group;
the second oil source can be communicated with a rod cavity of the main oil cylinder, and the energy accumulator is arranged between the second oil source and the main oil cylinder;
after a piston of the main oil cylinder moves towards a rodless cavity of the main oil cylinder to a preset position, the main oil cylinder sends signal oil to the overflow valve group through the signal valve group, so that the overflow valve group overflows, and the oil pressure provided by the first oil source to the rodless cavity of the main oil cylinder is smaller than the oil pressure provided by the second oil source and the energy accumulator;
and after the rod cavity of the main oil cylinder is communicated with the second oil source and the energy accumulator, the oil pressure of the rod cavity of the main oil cylinder is larger than that of the rodless cavity of the main oil cylinder.
2. The hydraulic system for a concrete pump truck as claimed in claim 1, wherein said master cylinder comprises a first master cylinder and a second master cylinder, said signal valve group comprises a first signal valve group and a second signal valve group, and said overflow valve group comprises a first control port and a second control port;
the first signal valve group is arranged between the first main oil cylinder and the overflow valve group, and the second signal valve group is arranged between the second main oil cylinder and the overflow valve group;
the first main oil cylinder transmits signal oil to the first control port through the first signal valve group, and the second main oil cylinder transmits signal oil to the second control port through the second signal valve group.
3. The hydraulic system for a concrete pump truck as claimed in claim 2, wherein the rod chamber of the first master cylinder can communicate with the rod chamber of the second master cylinder, and the rodless chamber of the first master cylinder can communicate with the rodless chamber of the second master cylinder.
4. The hydraulic system for a concrete pump truck as claimed in claim 3, wherein the rod chamber of the second master cylinder communicates with the second oil source and the accumulator through a ball valve.
5. The hydraulic system for a concrete pump truck as claimed in claim 2, wherein the rodless cavity of the first master cylinder is provided with a first limit cylinder, the rodless cavity of the second master cylinder is provided with a second limit cylinder, and the first limit cylinder and the second limit cylinder can be communicated with the oil tank or the second oil source.
6. The hydraulic system for the concrete pump truck as claimed in claim 5, further comprising a concrete-returning valve set disposed between the first and second limiting cylinders and the second oil source, the first and second limiting cylinders being communicated with the oil tank or the second oil source through the concrete-returning valve set.
7. The hydraulic system for the concrete pump truck as recited in claim 6, wherein the concrete-withdrawing valve set comprises a two-position four-way solenoid valve and a check valve, the two-position four-way solenoid valve comprises a first connecting port, a second connecting port and a third connecting port, the check valve is arranged between the first connecting port and the second oil source, the second connecting port is communicated with the oil tank, and the third connecting port is communicated with the first limiting oil cylinder and the second limiting oil cylinder.
8. The hydraulic system for a concrete pump truck as claimed in claim 3, wherein the rodless cavity of the first master cylinder and the rodless cavity of the second master cylinder are connected by a rodless cavity communication valve group, and the rodless cavity communication valve group is used for controlling communication between the rodless cavity of the first master cylinder and the rodless cavity of the second master cylinder.
9. The hydraulic system for a concrete pump truck of claim 8, wherein the rodless cavity communication valve block comprises a first cartridge valve and a second cartridge valve, the first cartridge valve comprises a first main oil port, a second main oil port and a third control port, and the second cartridge valve comprises a third main oil port, a fourth main oil port and a fourth control port;
the first main oil port and the third main oil port are communicated and communicated with a rodless cavity of the first main oil cylinder, the second main oil port and the fourth main oil port are communicated and communicated with a rodless cavity of the second main oil cylinder, and the third control port and the fourth control port are selectively communicated with the second oil source.
10. A concrete pump truck characterized in that it comprises a hydraulic system for a concrete pump truck as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023248639.1U CN215171112U (en) | 2020-12-29 | 2020-12-29 | Hydraulic system for concrete pump truck and concrete pump truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023248639.1U CN215171112U (en) | 2020-12-29 | 2020-12-29 | Hydraulic system for concrete pump truck and concrete pump truck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215171112U true CN215171112U (en) | 2021-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023248639.1U Active CN215171112U (en) | 2020-12-29 | 2020-12-29 | Hydraulic system for concrete pump truck and concrete pump truck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215171112U (en) |
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2020
- 2020-12-29 CN CN202023248639.1U patent/CN215171112U/en active Active
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