CN215927954U - Hydraulic system and engineering machinery - Google Patents
Hydraulic system and engineering machinery Download PDFInfo
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- CN215927954U CN215927954U CN202122152693.4U CN202122152693U CN215927954U CN 215927954 U CN215927954 U CN 215927954U CN 202122152693 U CN202122152693 U CN 202122152693U CN 215927954 U CN215927954 U CN 215927954U
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Abstract
The utility model provides a hydraulic system and engineering machinery, wherein the hydraulic system comprises a tilt cylinder hydraulic system, a stirring hydraulic system and an oil pump assembly, the tilt cylinder hydraulic system is connected with a tilt cylinder oil way, the stirring hydraulic system is connected with a stirring oil way, the tilt cylinder oil way and the stirring oil way are respectively connected with the oil pump assembly, a speed regulating valve is arranged on the stirring oil way, and the speed regulating valve is used for stabilizing the flow of hydraulic oil in the stirring oil way. The oil pump assembly is correspondingly communicated with the tilt cylinder hydraulic system and the stirring hydraulic system through a tilt cylinder oil way and a stirring oil way; through setting up the governing valve on stirring oil circuit, when the engine speed changed greatly under the different torques of different discharge capacities, accessible governing valve adjusted the distribution to stirring hydraulic system and tilt cylinder hydraulic system's flow, made the flow of the hydraulic oil in the stirring oil circuit stable, this kind of hydraulic system simple structure, practiced thrift the cost, and can guarantee tilt cylinder hydraulic system and stirring hydraulic system steady operation.
Description
Technical Field
The utility model relates to the technical field of pumping, in particular to a hydraulic system and engineering machinery.
Background
The tilt cylinder reversing system and the stirring system are part of a hydraulic system of concrete pumping engineering machinery such as a pump truck, a vehicle-mounted pump, a trailer pump and the like. The oscillating cylinder reversing system is responsible for reversing a pumping S pipe, and the stirring system is responsible for driving the stirring hydraulic system to feed the pumping mechanism, preventing concrete in the hopper from being separated, driving a hydraulic heat dissipation fan and the like. The two systems are driven by two oil pumps independently at present, one tilt cylinder oil pump is responsible for tilt cylinder reversing, and the other stirring oil pump is responsible for stirring.
In the prior art, when an energy-saving mode is adopted in pumping construction, the change of the rotating speed of an engine is large under different discharge capacities and different torques, and the large fluctuation of the rotating speed can cause the problems of unstable flow of a stirring oil pump and unstable stirring rotating speed. The stirring rotating speed is too low, the feeding performance is poor, and the radiating effect is poor due to the low rotating speed of the radiating fan; too high rotating speed easily causes concrete segregation and the fan rotating speed is too high to lead to the noise too big.
SUMMERY OF THE UTILITY MODEL
The utility model provides a hydraulic system and engineering machinery, which are used for solving the problems that the flow of a stirring oil pump is unstable and the stirring rotating speed is unstable due to large fluctuation of the rotating speed when an engine is greatly changed under different discharge capacities and different torques in the prior art.
The utility model provides a hydraulic system which comprises a tilt cylinder hydraulic system, a stirring hydraulic system and an oil pump assembly, wherein the tilt cylinder hydraulic system is connected with a tilt cylinder oil way, the stirring hydraulic system is connected with a stirring oil way, the tilt cylinder oil way and the stirring oil way are respectively connected with the oil pump assembly, a speed regulating valve is arranged on the stirring oil way, and the speed regulating valve is used for stabilizing the flow of hydraulic oil in the stirring oil way.
According to the hydraulic system provided by the utility model, the speed regulating valve is an electric proportional speed regulating valve or a manual speed regulating valve.
According to the hydraulic system provided by the utility model, the oil pump assembly is a single oil pump, and the tilt cylinder oil way and the stirring oil way are respectively connected to the single oil pump.
According to the hydraulic system provided by the utility model, the oil pump assembly comprises a tilt cylinder oil pump and a stirring oil pump, the tilt cylinder oil path is connected to the tilt cylinder oil pump, the stirring oil path is connected to the stirring oil pump, a connecting pipeline is connected between the tilt cylinder oil path and the stirring oil path, one end of the connecting pipeline is communicated with the tilt cylinder oil path, and the other end of the connecting pipeline is communicated with the stirring oil path and is positioned between the speed regulating valve and the stirring oil pump.
The hydraulic system further comprises an energy accumulator and a one-way valve, the energy accumulator is communicated with the oscillating cylinder oil path, the one-way valve is further arranged between the energy accumulator and the oil pump assembly on the oscillating cylinder oil path, and the one-way valve is used for maintaining the pressure of the energy accumulator.
The hydraulic system further comprises an unloading valve, a pressurizing electromagnetic valve and an oil tank, wherein the inlet end of the unloading valve is communicated with the energy accumulator, and the outlet end of the unloading valve is communicated with the oil tank; the pressurizing electromagnetic valve is arranged on the tilt cylinder oil way and is positioned between the oil pump assembly and the one-way valve.
The hydraulic system further comprises a first overflow valve and a high-pressure filter, wherein an inlet of the first overflow valve is communicated with an inlet of the pressurizing electromagnetic valve, and an outlet of the first overflow valve is communicated with the oil tank; the high-pressure filter is arranged on the tilt cylinder oil way and is positioned between the oil pump assembly and the inlet of the first overflow valve.
According to the hydraulic system provided by the utility model, the stirring hydraulic system comprises an air cooling motor and a stirring motor, and the speed regulating valve is sequentially communicated with the air cooling motor and the stirring motor; an electromagnetic valve is arranged between the speed regulating valve and the stirring motor, the first end of the electromagnetic valve is communicated with an oil path inlet of the air cooling motor, and the second end of the electromagnetic valve is communicated with an oil path outlet of the air cooling motor;
the hydraulic system further comprises a second overflow valve, an inlet of the second overflow valve is communicated with an oil path inlet of the air-cooled motor, and an outlet of the second overflow valve is communicated with an oil path outlet of the air-cooled motor.
According to the hydraulic system provided by the utility model, a reverse electromagnetic valve is connected between the air cooling motor and the stirring motor, a stirring stop valve is connected between the reverse electromagnetic valve and the stirring motor, and the stirring stop valve is used for limiting the rotation of the stirring motor.
The utility model also provides engineering machinery comprising the hydraulic system.
According to the hydraulic system and the engineering machinery provided by the utility model, the oil pump assembly is correspondingly communicated with the tilt cylinder hydraulic system and the stirring hydraulic system through the tilt cylinder oil path and the stirring oil path, namely, the tilt cylinder hydraulic system and the stirring hydraulic system are supplied with oil through the oil pump assembly; the speed regulating valve is arranged on the stirring oil way, so that when the rotating speed of the engine changes greatly under different displacements and different torques, the flow of the stirring hydraulic system and the flow of the tilt cylinder hydraulic system can be regulated and distributed through the speed regulating valve, and the flow of the hydraulic oil in the stirring oil way is stable; the hydraulic system has a simple structure, saves cost, and can ensure stable operation of the tilt cylinder hydraulic system and the stirring hydraulic system.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a hydraulic system according to the present invention;
FIG. 2 is a second schematic structural diagram of a hydraulic system according to the present invention;
FIG. 3 is a third schematic diagram of a hydraulic system according to the present invention;
reference numerals:
1: a power source; 2: a main oil pump; 3: a tilt cylinder oil pump;
4: a high pressure filter; 5: a first overflow valve; 6: a pressurizing electromagnetic valve;
7: a one-way valve; 8: an accumulator; 9: a tilt cylinder reversing valve;
10: oscillating a cylinder; 11: an oil tank; 12: a stirring oil pump;
13: an air-cooled motor; 14: a second overflow valve; 15: an electromagnetic valve;
16: a reverse rotation solenoid valve; 17: a stirring motor; 18: a stirring stop valve;
19: a manual speed regulating valve; 20: a single oil pump; 21: an electric proportional speed regulating valve;
22: an unloading valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following describes a hydraulic system and a construction machine provided by the present invention with reference to fig. 1 to 3.
Referring to fig. 1, the hydraulic system provided by this embodiment includes a tilt cylinder hydraulic system, a stirring hydraulic system and an oil pump assembly, the tilt cylinder hydraulic system is connected with a tilt cylinder oil path, the stirring hydraulic system is connected with a stirring oil path, the tilt cylinder oil path and the stirring oil path are respectively connected to the oil pump assembly, and a speed regulating valve is arranged on the stirring oil path and used for stabilizing the flow of hydraulic oil in the stirring oil path.
According to the hydraulic system provided by the embodiment of the utility model, the tilt cylinder hydraulic system and the stirring hydraulic system are operated by adopting the oil pump assembly combined with the power source 1. Specifically, the tilt cylinder hydraulic system is connected with a tilt cylinder oil path, the tilt cylinder oil path is communicated with an oil pump assembly, an inlet end of the oil pump assembly is communicated with an oil tank 11, and an oil source is provided for the oil pump assembly by combining a power source 1, so that the oil pump assembly can directly supply oil to the tilt cylinder hydraulic system; the stirring hydraulic system is connected with a stirring oil way, the stirring oil way is also communicated with the oil pump assembly, and the oil pump assembly can directly supply oil to the stirring hydraulic system by combining the power source 1; that is to say, the oil pump assembly can drive the oil supply to the tilt cylinder hydraulic system and the stirring hydraulic system through the tilt cylinder oil circuit and the stirring oil circuit respectively.
Furthermore, a speed regulating valve is communicated with the stirring oil path, the speed regulating valve is a combined valve formed by connecting a constant-differential pressure reducing valve and a throttle valve in series, and the constant-differential pressure reducing valve automatically compensates the influence of load change to enable the pressure difference between the front and the rear of the throttle valve to be a constant value, so that the influence of the load change on the flow is eliminated; namely, the speed regulating valve is provided with pressure compensation, the flow rate does not change along with the load (pressure), and the speed regulating valve is relatively stable. The inlet of the speed regulating valve is communicated with the outlet end of the oil pump assembly, the outlet of the speed regulating valve is communicated with the stirring hydraulic system and used for regulating and stabilizing the flow of hydraulic oil in the stirring oil way, namely when the rotating speed of the engine changes under different displacements and different torques, the hydraulic oil in the oil pump assembly is regulated by the speed regulating valve to ensure that the flow entering the stirring hydraulic system is stable, so that the stirring hydraulic system can stably run.
According to the hydraulic system provided by the utility model, the oil pump assembly is correspondingly communicated with the tilt cylinder hydraulic system and the stirring hydraulic system through the tilt cylinder oil way and the stirring oil way, namely oil is supplied to the tilt cylinder hydraulic system and the stirring hydraulic system through the oil pump assembly; the speed regulating valve is arranged on the stirring oil way, so that when the rotating speed of the engine changes greatly under different displacements and different torques, the flow of the stirring hydraulic system and the flow of the tilt cylinder hydraulic system can be regulated and distributed through the speed regulating valve, and the flow of the hydraulic oil in the stirring oil way is stable; the hydraulic system has a simple structure, saves cost, and can ensure stable operation of the tilt cylinder hydraulic system and the stirring hydraulic system.
Further, the hydraulic system provided by the embodiment further comprises an energy accumulator and a check valve, the oscillating cylinder oil path is communicated with the energy accumulator 8, the check valve 7 is further arranged between the energy accumulator 8 and the oil pump assembly on the oscillating cylinder oil path, and the check valve 7 is used for maintaining the pressure in the energy accumulator 8.
Specifically, an energy accumulator 8 is communicated with an oil path of the tilt cylinder, the energy accumulator 8 is used for storing energy and providing energy for quick reversing of the tilt cylinder, pressure oil supplied by a gear pump is stored in the energy accumulator 8 before reversing of the tilt cylinder, the stored pressure can rise at the same time, when the pressure rises to the opening pressure of the first overflow valve 5, redundant pressure oil is discharged back to the oil tank from the first overflow valve 5, and the pressure oil of the energy accumulator 8 is stabilized near the set pressure value of the first overflow valve 5; when the tilt cylinder needs to be reversed, the pressure oil stored in the energy accumulator 8 is quickly released, and the pressure oil supplied by the gear pump push the tilt cylinder to be quickly reversed. And when the pressure oil is released by the energy accumulator, the pressure in the energy accumulator is synchronously reduced, when the cylinder swinging reversing is finished, the pressure of the energy accumulator is reduced to the lowest value, and then the gear pump continues to charge the energy accumulator to prepare for the next cylinder swinging reversing. Still be equipped with check valve 7 on the pendulum cylinder oil circuit, check valve 7 is located between energy storage ware 8 and the oil pump subassembly for lead to oil pump subassembly's exit end to energy storage ware 8, also can avoid the hydraulic oil flow in the energy storage ware 8 to the oil pump subassembly simultaneously, realize the pressurize.
The hydraulic oil of the hydraulic stirring system of the embodiment is directly supplied from the oil pump assembly. The stirring oil way is provided with a speed regulating valve, and the oil is supplied to the stirring hydraulic system after being regulated by the speed regulating valve. The speed regulating valve has the compensation function, and the flow is stable, so that the stirring rotating speed is stable.
On the basis of the above embodiments, the oil pump assembly provided by the present embodiment includes the single oil pump 20, and the tilt cylinder oil path and the stirring oil path are respectively connected to the single oil pump 20. Referring to fig. 1, the hydraulic system is provided with a single oil pump 20, the single oil pump supplies oil to the tilt cylinder hydraulic system and the stirring hydraulic system, specifically, the single oil pump 20 is communicated with the tilt cylinder hydraulic system through a tilt cylinder oil path and is communicated with the stirring hydraulic system through a stirring oil path, that is, the single oil pump 20 can simultaneously supply oil to the tilt cylinder hydraulic system and supply oil to the stirring hydraulic system, the hydraulic oil of the single oil pump 20 adjusts the flow of the hydraulic oil through a speed regulating valve to supply oil to the stirring hydraulic system, and the redundant hydraulic oil charges the energy accumulator 8 on the tilt cylinder oil path and/or reverses the tilt cylinder hydraulic system. In the embodiment, the single oil pump 20 is used for supplying oil to the tilt cylinder hydraulic system and the stirring hydraulic system respectively, so that resources are saved, and the speed regulating valve is arranged on the stirring oil path to regulate the flow on the stirring oil path, so that the stirring hydraulic system can stably operate.
In the embodiment, two oil pumps which are commonly used in the prior art are replaced by one single oil pump 20, the displacement of the single oil pump 20 is smaller than the sum of the displacements of the two original oil pumps, and the required power is smaller than that of the two pumps. When the two pumps are configured, the stirring oil pump and the tilt cylinder oil pump need to meet system requirements at different rotating speeds, and certain margin needs to be provided. When the single oil pump 20 is configured, the flow in the stirring hydraulic system is fixed through the adjustment of the speed regulating valve, and the margin does not need to be considered, so the displacement of the single oil pump 20 can be smaller than the sum of the displacements of the double pumps. In addition, the cost can be reduced by adjusting the two oil pumps to one single oil pump 20.
In another embodiment, the oil pump assembly includes a tilt cylinder oil pump 3 and a stirring oil pump 12, the tilt cylinder oil path is connected to the tilt cylinder oil pump 3, the stirring oil path is connected to the stirring oil pump 12, a connection pipeline is connected between the tilt cylinder oil path and the stirring oil path, one end of the connection pipeline is communicated with the tilt cylinder oil path, and the other end of the connection pipeline is communicated with the stirring oil path and is located between the speed regulating valve and the stirring oil pump 12.
Referring to fig. 2, the oil pump assembly includes a tilt cylinder oil pump 3 and a stirring oil pump 12, and the tilt cylinder oil pump 3 and the stirring oil pump 12 are combined with the power source 1 to coaxially drive the tilt cylinder hydraulic system and the stirring hydraulic system to operate. Specifically, the tilt cylinder oil pump 3 is communicated with the tilt cylinder hydraulic system through a tilt cylinder oil path, the stirring oil pump 12 is communicated with the stirring hydraulic system through a stirring oil path, a connecting pipeline is connected between the tilt cylinder oil path and the stirring oil path, one end of the connecting pipeline is communicated with the tilt cylinder oil path, the other end of the connecting pipeline is communicated with the stirring oil path and is located between the speed regulating valve and the stirring oil pump 12, so that hydraulic oil in the tilt cylinder oil pump 3 can flow to the stirring oil path through the connecting pipeline, and hydraulic oil of the stirring oil pump 12 can flow to the tilt cylinder oil path through the connecting pipeline.
In a preferred embodiment, the hydraulic oil in the stirring oil pump 12 enters the stirring oil path after being regulated by the speed regulating valve, that is, the hydraulic oil in the stirring oil path is stable, and the excess hydraulic oil can flow to the tilt cylinder oil path through the connecting pipeline to charge the energy accumulator 8 or change the direction of the tilt cylinder 10. The structure is simple, and the influence on the operation of the stirring system caused by the large change of the rotating speed of the engine under different displacements and different torques can be avoided.
Further, the hydraulic system provided by the present embodiment further includes an unloading valve 22 and a tank, an inlet end of the unloading valve 22 is communicated with the accumulator 8, and an outlet end of the unloading valve 22 is communicated with the tank.
Specifically, the energy accumulator 8 is communicated with an unloading valve 22, an inlet end of the unloading valve 22 is communicated with an outlet end of the energy accumulator 8, and an outlet end of the unloading valve 22 is communicated with an oil tank. When the equipment needs to be overhauled, the unloading valve 22 is opened, and the pressure oil in the energy accumulator is unloaded back to the oil tank.
On the basis of the above embodiments, the hydraulic system provided in this embodiment further includes a pressurizing solenoid valve 6, where the pressurizing solenoid valve 6 is disposed in the tilt cylinder oil path and located between the oil pump assembly and the check valve 7.
Referring to fig. 1 and 2, in one embodiment, the pressurizing solenoid valve 6 is a two-position four-way pressurizing solenoid valve 6, the pressurizing solenoid valve 6 is disposed on the cylinder swing oil path, one end of the pressurizing solenoid valve 6 has two oil ports respectively communicated with the cylinder swing oil path and the oil tank, and the other end of the pressurizing solenoid valve 6 has two oil ports respectively communicated with the check valve 7 and the oil tank; the pressurizing electromagnetic valve 6 is electrified, and hydraulic oil in the oil pump assembly can flow to the energy accumulator 8 through the pressurizing electromagnetic valve 6 to pressurize the energy accumulator; or directly flows to the tilt cylinder hydraulic system to ensure that the tilt cylinder hydraulic system normally operates; when the charging electromagnetic valve 6 is not electrified, the hydraulic oil in the oil pump assembly returns to the oil tank through the charging electromagnetic valve 6.
Further, the hydraulic system that this embodiment provided still includes first overflow valve 5, and first overflow valve 5 and tilt cylinder oil circuit intercommunication, the import of first overflow valve 5 and the import of pressurizing solenoid valve 6 intercommunication, the export of first overflow valve 5 and oil tank intercommunication realize the overflow when surpassing the set pressure. Specifically, the first overflow valve 5 sets a certain pressure, hydraulic oil in the oil pump assembly is pressurized to the energy accumulator 8 through an inlet of the charging solenoid valve 6, or when the pressure when entering the tilt cylinder hydraulic system exceeds a set pressure value of the first overflow valve 5, the hydraulic oil flows to the first overflow valve 5 and flows back to the oil tank from an outlet of the first overflow valve 5, so that overflow is realized, and the influence on equipment safety due to overhigh pressure is avoided.
On the basis of the above embodiment, the hydraulic system provided by this embodiment further includes a high-pressure filter 4, where the high-pressure filter 4 is disposed in the tilt cylinder oil path and located between the oil pump assembly and the inlet of the first relief valve 5.
The high pressure filter 4 is used for filtering out contaminants which may invade valve-like elements and protecting hydraulic elements in the system. The high-pressure filter 4 is arranged on the oil circuit of the oscillating cylinder and is used for filtering pollutants, so that the hydraulic oil entering the oil circuit of the oscillating cylinder through the high-pressure filter 4 is clean; specifically, the high-pressure filter 4 is disposed between the oil pump assembly and the inlet of the first relief valve 5, and can fundamentally remove contaminants in the hydraulic oil exiting the oil pump assembly.
In this embodiment, the type of the high-pressure filter 4 is not particularly limited, and the high-pressure filter may filter contaminants in the hydraulic oil.
The hydraulic system of the tilt cylinder provided by the embodiment comprises a tilt cylinder 10 and a tilt cylinder reversing valve 9, wherein the tilt cylinder reversing valve 9 is arranged between an energy accumulator 8 and the tilt cylinder 10. Specifically, referring to fig. 1, the tilt cylinder reversing valve 9 is a three-position four-way tilt cylinder reversing valve 9, one end of the tilt cylinder reversing valve 9 is provided with two oil ports, the two oil ports are communicated with the tilt cylinder oil path and the oil tank 11 in a one-to-one correspondence manner, and the two oil ports at the other end of the tilt cylinder reversing valve 9 are correspondingly connected with the two ends of the tilt cylinder 10, so that the reversing is realized.
In this embodiment, the type of the tilt cylinder reversing valve 9 is not specifically limited, and may be a three-position four-way electromagnetic reversing valve or a three-position four-way electro-hydraulic pilot reversing valve, and the reversing may be achieved.
On the basis of the above embodiment, the hydraulic system provided by the present embodiment further includes a stirring hydraulic system; the stirring hydraulic system can realize air cooling and stirring functions at the same time, and the speed regulating valve is communicated with the air cooling motor 13 and the stirring motor 17 in sequence; an electromagnetic valve 15 is arranged between the speed regulating valve and the stirring motor 17, the first end of the electromagnetic valve 15 is communicated with the oil path inlet of the air cooling motor 13, and the second end of the electromagnetic valve 15 is communicated with the oil path outlet of the air cooling motor 13.
In one embodiment, the oil pump assembly is communicated with the stirring hydraulic system through a stirring oil path, a speed regulating valve is arranged on the stirring oil path, and the speed regulating valve is sequentially communicated with the air cooling motor 13 and the stirring motor 17, so that hydraulic oil sequentially flows to the air cooling motor 13 and the stirring motor 17; furthermore, an electromagnetic valve 15 is arranged between the speed regulating valve and the stirring motor 17, a first end of the electromagnetic valve 15 is communicated with an oil path inlet of the air cooling motor 13, and a second end of the electromagnetic valve 15 is communicated with an oil path outlet of the air cooling motor 13, so that hydraulic oil can flow to the stirring motor 17 through the electromagnetic valve 15.
Specifically, when the hydraulic system of the mixing hydraulic system needs to dissipate heat, the electromagnetic valve 15 is switched off, the air-cooled motor 13 is started, hydraulic oil in the oil pump assembly flows to the air-cooled motor 13 through the speed regulating valve and flows to the mixing motor 17 through an oil path outlet of the air-cooled motor 13, so that the air-cooled motor and the mixing motor 17 run simultaneously; when the hydraulic system of the mixing hydraulic system does not need to dissipate heat, the electromagnetic valve 15 is powered on, the air cooling motor 13 is closed, and the hydraulic oil in the oil pump assembly flows to the first end of the electromagnetic valve 15 through the speed regulating valve and flows to the mixing motor 17 through the second port of the electromagnetic valve 15, so that the mixing motor 17 operates.
According to the utility model, the speed regulating valve is arranged on the stirring oil path, hydraulic oil is supplied to the air cooling motor 13 and the stirring motor 17 through the speed regulating valve, when the change of the engine rotating speed is large under different discharge capacities and different torques, the speed regulating valve has a compensation function, the flow of the hydraulic oil in the stirring oil path can be regulated by the speed regulating valve, so that the flow of the hydraulic oil in the stirring oil path is stable, the rotating speeds of the stirring motor 17 and the air cooling motor 13 are stable, and the problems of oil leakage and overhigh noise caused by the overspeed of the air cooling motor 13 due to the high-speed operation of the engine and the segregation phenomenon caused by overhigh stirring rotating speed are avoided.
Further, the hydraulic system that this embodiment provided still includes second overflow valve 14, and the import of second overflow valve 14 and the oil circuit import of air-cooled motor 13 communicate, and the export of second overflow valve 14 and the oil circuit export of air-cooled motor 13 communicate.
In one embodiment, the second relief valve 14 is disposed at a bypass position of the air-cooled motor 13, an inlet of the second relief valve 14 is communicated with an oil path inlet of the air-cooled motor 13, and an outlet of the second relief valve 14 is communicated with an oil path outlet of the air-cooled motor 13. Specifically, the second overflow valve 14 sets a certain pressure, when the pressure difference between the oil path inlet and the outlet of the air-cooled motor 13 exceeds the set pressure of the second overflow valve 14, the second overflow valve 14 realizes overflow, that is, hydraulic oil flows to the second overflow valve 14, flows to the oil path outlet of the air-cooled motor 13 through the outlet of the second overflow valve 14, and further flows to the stirring motor 17, when the air-cooled motor or the fan mechanism hairpin leads to pressure rise, the hydraulic oil can flow through the bypass overflow valve, and the pressure is prevented from being too high, so that hydraulic elements such as the air-cooled motor and the pump are protected.
Further, a reverse electromagnetic valve 16 is connected between the air-cooling motor 13 and the stirring motor 17, a stirring stop valve 18 is connected between the reverse electromagnetic valve 16 and the stirring motor 17, and the stirring stop valve 18 is used to restrict the rotation of the stirring motor 17.
The hydraulic system that this embodiment provided is connected with reversal solenoid valve 16 between air-cooled motor 13 and agitator motor 17, and reversal solenoid valve 16 is two-position four-way reversal solenoid valve 16, and reversal solenoid valve 16's first end has two hydraulic fluid ports, and two hydraulic fluid ports and air-cooled motor 13 and oil tank 11 one-to-one intercommunication, and reversal solenoid valve 16's second end also has two hydraulic fluid ports, and two hydraulic fluid ports communicate with agitator motor 17's both ends one-to-one, and then realize agitator motor 17's corotation and reversal.
Further, the hydraulic system provided in the present embodiment further includes a stirring stop valve 18, and the stirring stop valve 18 is disposed between the reverse rotation electromagnetic valve 16 and the stirring motor 17, and is used for limiting the operation of the stirring motor 17. Specifically, when the hydraulic stirring system is stopped or maintained, the stirring stop valve 18 is closed, so that the hydraulic stirring system is prevented from rotating accidentally, and the safety of the hydraulic stirring system is improved.
In this embodiment, the setting position of the stirring stop valve 18 is not particularly limited, and may be between the reverse solenoid valve and the first oil port of the stirring motor, or may be between the reverse solenoid valve and the second oil port of the stirring motor.
The hydraulic system provided by the embodiment further comprises a main oil pump 2, wherein the main oil pump 2 is communicated with the main system and is combined with the power source 1 to supply oil to the main system.
The overflow valve provided in this embodiment is not particularly limited, and overflow may be achieved.
The speed control valve in this embodiment is not particularly limited, and may be a manual speed control valve 19, as shown in fig. 1 and 2, or an electric proportional speed control valve 21, as shown in fig. 3, so as to stabilize the flow rate of the hydraulic oil in the stirring oil path.
In the hydraulic system provided by the embodiment, a large-displacement constant delivery pump (gear pump) is shared by a tilt cylinder hydraulic system and a stirring hydraulic system, the flow of the tilt cylinder hydraulic system and the flow of the stirring hydraulic system are internally adjusted and distributed, and a speed regulating valve can stabilize and preferentially ensure the flow of an air cooling motor 13 and the flow of a stirring motor 17; when the change of the rotating speed of the engine is large under different displacements and different torques, the flow of the hydraulic oil in the stirring hydraulic system can be adjusted through the speed regulating valve, so that the stirring motor 17 and the air cooling motor 13 can operate at a reasonable rotating speed, the requirements of the stirring rotating speed and the air cooling rotating speed of the engine under the condition of low rotating speed or high rotating speed are met, redundant hydraulic oil flows to a cylinder swinging oil way to enter an energy accumulator for pressurization or enter the cylinder swinging hydraulic system for reversing, the power consumption is reduced, and the pumping power is improved.
In the embodiment, the flow rates of the hydraulic oil in the stirring motor 17 and the air cooling motor 13 in the stirring hydraulic system are adjusted through the speed regulating valve, so that the rotating speed of the stirring motor 17 and the rotating speed of the air cooling motor 13 are stable, the influence of the rotating speed of the engine in an energy-saving mode is avoided, the feeding performance requirement of the stirring hydraulic system can be met, and the cooling effect and noise requirement of the air cooler can also be met.
The hydraulic system provided by the embodiment has stronger working condition adaptability, and different rotating speeds can be adjusted according to different materials to be pumped as the flow in the stirring hydraulic system can be adjusted; the flow distribution of the mixing hydraulic system and the tilt cylinder hydraulic system can be adjusted through the flow regulation of the speed regulating valve, for example, if the leakage amount of the tilt cylinder hydraulic system is increased, and the flow of the tilt cylinder hydraulic system is insufficient, the flow of the mixing hydraulic system can be properly reduced, and the flow of the tilt cylinder hydraulic system can be correspondingly increased.
The embodiment also provides a construction machine, which comprises the hydraulic system in any one of the embodiments, wherein the construction machine can be a pump truck, a vehicle-mounted pump or a trailer pump and the like.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a hydraulic system, its characterized in that, includes tilt cylinder hydraulic system, stirring hydraulic system and oil pump subassembly, tilt cylinder hydraulic system is connected with the tilt cylinder oil circuit, stirring hydraulic system is connected with the stirring oil circuit, the tilt cylinder oil circuit with the stirring oil circuit connect respectively in the oil pump subassembly, just be equipped with the governing valve on the stirring oil circuit, the governing valve is used for stabilizing the flow of hydraulic oil in the stirring oil circuit.
2. The hydraulic system of claim 1, wherein the speed valve is an electrically proportional speed valve or a manual speed valve.
3. The hydraulic system of claim 1, wherein the oil pump assembly is a single oil pump, and the tilt cylinder oil passage and the agitation oil passage are respectively connected to the single oil pump.
4. The hydraulic system according to claim 1, wherein the oil pump assembly comprises a tilt cylinder oil pump and a stirring oil pump, the tilt cylinder oil path is connected to the tilt cylinder oil pump, the stirring oil path is connected to the stirring oil pump, a connecting pipeline is connected between the tilt cylinder oil path and the stirring oil path, one end of the connecting pipeline is communicated with the tilt cylinder oil path, and the other end of the connecting pipeline is communicated with the stirring oil path and is located between the speed regulating valve and the stirring oil pump.
5. The hydraulic system as claimed in any one of claims 1 to 4, further comprising an accumulator and a check valve, wherein the accumulator is connected to the swing cylinder oil line, and the check valve is further provided between the accumulator and the oil pump assembly on the swing cylinder oil line, and the check valve is used for maintaining the pressure of the accumulator.
6. The hydraulic system of claim 5, further comprising an unloader valve, a charging solenoid valve, and a tank, wherein an inlet end of the unloader valve is in communication with the accumulator and an outlet end of the unloader valve is in communication with the tank; the pressurizing electromagnetic valve is arranged on the tilt cylinder oil way and is positioned between the oil pump assembly and the one-way valve.
7. The hydraulic system according to claim 6, characterized by further comprising a first overflow valve, a high-pressure filter, an inlet of the first overflow valve being communicated with an inlet of the pressurizing solenoid valve, an outlet of the first overflow valve being communicated with the oil tank; the high-pressure filter is arranged on the tilt cylinder oil way and is positioned between the oil pump assembly and the inlet of the first overflow valve.
8. The hydraulic system of any one of claims 1 to 4, wherein the mixing hydraulic system comprises an air-cooled motor and a mixing motor, and the speed regulating valve is communicated with the air-cooled motor and the mixing motor in sequence; an electromagnetic valve is arranged between the speed regulating valve and the stirring motor, the first end of the electromagnetic valve is communicated with an oil path inlet of the air cooling motor, and the second end of the electromagnetic valve is communicated with an oil path outlet of the air cooling motor;
the hydraulic system further comprises a second overflow valve, an inlet of the second overflow valve is communicated with an oil path inlet of the air-cooled motor, and an outlet of the second overflow valve is communicated with an oil path outlet of the air-cooled motor.
9. The hydraulic system according to claim 8, wherein a reverse solenoid valve is connected between the air-cooled motor and the stirring motor, and a stirring stop valve is connected between the reverse solenoid valve and the stirring motor and used for limiting rotation of the stirring motor.
10. A working machine, characterized in that it comprises a hydraulic system according to any one of the preceding claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122152693.4U CN215927954U (en) | 2021-09-07 | 2021-09-07 | Hydraulic system and engineering machinery |
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