Flow dividing valve, hydraulic system thereof and engineering machinery
阅读说明：本技术 一种分流阀及其液压系统、工程机械 (Flow dividing valve, hydraulic system thereof and engineering machinery ) 是由 李建洋 谢朝阳 范小童 宋亚莉 刘奔奔 邓应应 于 2020-06-29 设计创作，主要内容包括：本发明公开了一种分流阀及其液压系统、工程机械,分流阀包括节流阀、第一液控阀、第二液控阀、单向阀、顺序阀、第三液控阀、梭阀,分流阀的进油口依次经过节流阀、单向阀与合流口连通,节流阀前压力、节流阀后压力各连通第二液控阀各一端控制腔；节流阀出口端分别通过处于一工作位的第一液控阀、第三液控阀与回油口T2相连,用于通过第一液控阀、第三液控阀卸荷；第一液控阀控制腔通过处于第一工作位的第二液控阀连通回油口T3；控制口c1、控制口c2各连至梭阀的一个进口；梭阀的工作口通过处于第二工作位的第二液控阀连通第一液控阀控制腔；合流口P2通过顺序阀与第三液控阀的控制端相连。实现合流、卸荷进油口流量或合流口压力。(The invention discloses a flow dividing valve, a hydraulic system thereof and engineering machinery, wherein the flow dividing valve comprises a throttling valve, a first hydraulic control valve, a second hydraulic control valve, a one-way valve, a sequence valve, a third hydraulic control valve and a shuttle valve, an oil inlet of the flow dividing valve is communicated with a flow merging port through the throttling valve and the one-way valve in sequence, and the front pressure and the rear pressure of the throttling valve are respectively communicated with a control cavity at each end of the second hydraulic control valve; the outlet end of the throttle valve is respectively connected with the oil return port T2 through a first hydraulic control valve and a third hydraulic control valve which are positioned at a working position, and is used for unloading through the first hydraulic control valve and the third hydraulic control valve; the first hydraulic control valve control cavity is communicated with the oil return port T3 through a second hydraulic control valve in a first working position; control port c1 and control port c2 are each connected to an inlet of the shuttle valve; the working port of the shuttle valve is communicated with the control cavity of the first hydraulic control valve through a second hydraulic control valve at a second working position; the confluence port P2 is connected to the control end of the third pilot controlled valve through a sequence valve. The flow of the confluence oil inlet and the unloading oil inlet or the pressure of the confluence opening is realized.)
1. A flow dividing valve is characterized by comprising a throttling valve, a first hydraulic control valve, a second hydraulic control valve, a one-way valve, a sequence valve, a third hydraulic control valve and a shuttle valve, wherein the flow dividing valve is provided with a control port c1, a control port c2, a flow merging port P2, an oil inlet P3, an oil return port T2 and an oil return port T3;
an oil inlet P3 of the flow divider is communicated with a flow merging port P2 through a throttle valve and a one-way valve in sequence, the front pressure of the throttle valve is communicated with a control cavity at one end of a second hydraulic control valve, the rear pressure of the throttle valve is communicated with a control cavity at the other end of the second hydraulic control valve and is used for controlling the position of a valve core of the second hydraulic control valve;
the outlet end of the throttle valve is respectively connected with an oil return port T2 through a first hydraulic control valve in one working position and a third hydraulic control valve in one working position, and is used for unloading through the first hydraulic control valve and the third hydraulic control valve; the first hydraulic control valve control cavity is communicated with the oil return port T3 through a second hydraulic control valve in a first working position;
one of the control port c1 and the control port c2 is connected to one inlet of the shuttle valve, and the other of the control port c1 and the control port c2 is connected to the other inlet of the shuttle valve; the working port of the shuttle valve is communicated with the control cavity of the first hydraulic control valve through a second hydraulic control valve at a second working position and is used for controlling the position of the valve core of the first hydraulic control valve;
one end of the sequence valve is connected with the confluence port P2, and the other end of the sequence valve is connected with the control end of the third hydraulic control valve for controlling the position of the valve core of the third hydraulic control valve.
2. The flow divider valve of claim 1 wherein control port c1 is connected to the lower inlet port of the shuttle valve, control port c2 is connected to the upper inlet port of the shuttle valve, and the throttle valve outlet port is connected to the return port T2 via a first pilot operated valve at right position and a third pilot operated valve at right position, respectively;
when the flow of the oil inlet P3 does not exceed a set value, the first hydraulic control valve control cavity is communicated with the oil return port T3 through the second hydraulic control valve which is at the upper position, the first hydraulic control valve is at the right position under the force of the return spring, the flow of the oil inlet P3 cannot be unloaded through the first hydraulic control valve in the flow dividing valve, and the flow of the oil inlet P3 flows to the confluence port P2 to be converged;
when the flow of the oil inlet P3 exceeds a set value, a working port of the shuttle valve is communicated with a control port of a first hydraulic control valve through a second hydraulic control valve at a lower position, the first hydraulic control valve moves left, and the flow of the oil inlet P3 is unloaded through the first hydraulic control valve in the flow dividing valve;
when the pressure of the confluence port P2 exceeds a preset value, the sequence valve is opened to push the third hydraulic control valve to be reversed to the left position, the flow of the confluence port P2 is unloaded back to the hydraulic oil tank through the third hydraulic control valve, and the pressure of the confluence port P2 is unloaded.
3. A hydraulic system comprising a hydraulic tank, a first pump, a second pump, a pilot valve, a multi-way valve, a first actuator, a second actuator and a flow divider valve according to claim 1 or 2; the first pump and the second pump are both fixed displacement pumps;
the first pump comprises a front pump and a rear pump; the oil inlets of the front pump, the rear pump and the second pump are all connected with a hydraulic oil tank, the oil outlet of the front pump is connected with an oil inlet P1 of the multi-way valve and a confluence port P2 of the diverter valve, the oil outlet of the second pump is connected with an oil inlet P3 of the diverter valve, and the oil outlet of the rear pump is connected with an oil inlet P4 of the pilot valve; the control port a1 of the pilot valve is connected with the control port b1 of the multi-way valve and the control port c1 of the shunt valve, the control port a2 of the pilot valve is connected with the control port b2 of the multi-way valve and the control port c2 of the shunt valve, the control port a3 of the pilot valve is connected with the control port b3 of the multi-way valve, and the control port a4 of the pilot valve is connected with the control port b4 of the multi-way;
a working oil port A1 of the multi-way valve is connected with an oil port of a rodless cavity of the first actuating element, a working oil port B1 of the multi-way valve is connected with an oil port of a rod cavity of the first actuating element, a working oil port A2 of the multi-way valve is connected with a rodless cavity of the second actuating element, and a working oil port B2 of the multi-way valve is connected with an oil port of a rod cavity of the second actuating element;
the oil return port T1 of the multi-way valve and the oil return ports T2 and T3 of the flow dividing valve are connected with a hydraulic oil tank.
4. The hydraulic system of claim 3, wherein the first actuator is a hydraulic ram.
5. The hydraulic system of claim 3, wherein the second actuator is a hydraulic ram.
6. The hydraulic system of claim 3, wherein the multiplex valve is a pilot controlled multiplex valve.
7. The hydraulic system as claimed in claim 3, characterized in that an overflow valve is further provided at the oil outlet of the rear pump, and flows back to the hydraulic oil tank through an overflow port.
8. A working machine, characterized in that it comprises a hydraulic system according to any one of claims 3-7.
Technical Field
The invention belongs to the technical field of engineering machinery, and particularly relates to a flow dividing valve, a hydraulic system of the flow dividing valve and the engineering machinery.
Background
At present, a power source part of a hydraulic system adopts an internal combustion engine, if a fixed displacement pump is adopted as a power element, the flow of the system changes along with the change of the rotating speed of the internal combustion engine, which has great influence on the performance of the hydraulic system, and particularly when the rotating speed of the internal combustion engine is low, the efficiency of the hydraulic system is obviously reduced. If the displacement of the fixed displacement pump is increased to ensure that the system flow is sufficient when the internal combustion engine rotates at a low speed, the fixed displacement pump can provide a large amount of redundant flow or throttle or overflow when the internal combustion engine rotates at a high speed, which causes energy waste, and meanwhile, when the pressure of the system is high, the required torque of the fixed displacement pump is increased to influence the output of a power source. Generally, a hydraulic system has more than one actuator, the demand flow of the actuators is different, and the design is based on the actuator with the maximum flow, so that the flow of the actuator with low demand flow is wasted, and the flow exceeding the demand flow is possibly harmful. In order to solve the contradiction, the technical scheme adopted in the market at present adopts a variable pump to provide corresponding flow according to the requirement of an actuating element, but the variable pump has higher cost and complex system.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a flow dividing valve, a hydraulic system of the flow dividing valve and engineering machinery of the flow dividing valve. According to the change of the pump flow of the hydraulic system, the flow converging to the system is automatically adjusted, the flow of different execution elements of the system is ensured, the energy waste is avoided, the harm caused by overlarge flow is eliminated, and meanwhile, the flow of the system is adjusted according to the system pressure, so that the overlarge torque required by the first pump and the second pump is avoided, and the influence on the output of a power source is avoided.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
in a first aspect, a flow dividing valve is provided, which comprises a throttle valve, a first hydraulic control valve, a second hydraulic control valve, a one-way valve, a sequence valve, a third hydraulic control valve and a shuttle valve, wherein the flow dividing valve is provided with a control port c1, a control port c2, a flow merging port P2, an oil inlet P3, an oil return port T2 and an oil return port T3;
an oil inlet P3 of the flow divider is communicated with a flow merging port P2 through a throttle valve and a one-way valve in sequence, the front pressure of the throttle valve is communicated with a control cavity at one end of a second hydraulic control valve, the rear pressure of the throttle valve is communicated with a control cavity at the other end of the second hydraulic control valve and is used for controlling the position of a valve core of the second hydraulic control valve;
the outlet end of the throttle valve is respectively connected with an oil return port T2 through a first hydraulic control valve in one working position and a third hydraulic control valve in one working position, and is used for unloading through the first hydraulic control valve and the third hydraulic control valve; the first hydraulic control valve control cavity is communicated with the oil return port T3 through a second hydraulic control valve in a first working position;
one of the control port c1 and the control port c2 is connected to one inlet of the shuttle valve, and the other of the control port c1 and the control port c2 is connected to the other inlet of the shuttle valve; the working port of the shuttle valve is communicated with the control cavity of the first hydraulic control valve through a second hydraulic control valve at a second working position and is used for controlling the position of the valve core of the first hydraulic control valve;
one end of the sequence valve is connected with the confluence port P2, and the other end of the sequence valve is connected with the control end of the third hydraulic control valve for controlling the position of the valve core of the third hydraulic control valve.
In some embodiments, the control port c1 of the flow divider valve is connected to the lower inlet of the shuttle valve, the control port c2 is connected to the upper inlet of the shuttle valve, and the outlet end of the throttle valve is connected with the oil return port T2 through the first hydraulic control valve at the right position and the third hydraulic control valve at the right position respectively;
when the flow of the oil inlet P3 does not exceed a set value, the first hydraulic control valve control cavity is communicated with the oil return port T3 through the second hydraulic control valve which is at the upper position, the first hydraulic control valve is at the right position under the force of the return spring, the flow of the oil inlet P3 cannot be unloaded through the first hydraulic control valve in the flow dividing valve, and the flow of the oil inlet P3 flows to the confluence port P2 to be converged;
when the flow of the oil inlet P3 exceeds a set value, a working port of the shuttle valve is communicated with a control port of a first hydraulic control valve through a second hydraulic control valve at a lower position, the first hydraulic control valve moves left, and the flow of the oil inlet P3 is unloaded through the first hydraulic control valve in the flow dividing valve;
when the pressure of the confluence port P2 exceeds a preset value, the sequence valve is opened to push the third hydraulic control valve to be reversed to the left position, the flow of the confluence port P2 is unloaded back to the hydraulic oil tank through the third hydraulic control valve, and the pressure of the confluence port P2 is unloaded.
In a second aspect, a hydraulic system is provided, which comprises a hydraulic oil tank, a first pump, a second pump, a pilot valve, a multi-way valve, a first actuator, a second actuator and a flow dividing valve as claimed in
the first pump comprises a front pump and a rear pump; the oil inlets of the front pump, the rear pump and the second pump are all connected with a hydraulic oil tank, the oil outlet of the front pump is connected with an oil inlet P1 of the multi-way valve and a confluence port P2 of the diverter valve, the oil outlet of the second pump is connected with an oil inlet P3 of the diverter valve, and the oil outlet of the rear pump is connected with an oil inlet P4 of the pilot valve; the control port a1 of the pilot valve is connected with the control port b1 of the multi-way valve and the control port c1 of the shunt valve, the control port a2 of the pilot valve is connected with the control port b2 of the multi-way valve and the control port c2 of the shunt valve, the control port a3 of the pilot valve is connected with the control port b3 of the multi-way valve, and the control port a4 of the pilot valve is connected with the control port b4 of the multi-way;
a working oil port A1 of the multi-way valve is connected with an oil port of a rodless cavity of the first actuating element, a working oil port B1 of the multi-way valve is connected with an oil port of a rod cavity of the first actuating element, a working oil port A2 of the multi-way valve is connected with a rodless cavity of the second actuating element, and a working oil port B2 of the multi-way valve is connected with an oil port of a rod cavity of the second actuating element;
the oil return port T1 of the multi-way valve and the oil return ports T2 and T3 of the flow dividing valve are connected with a hydraulic oil tank.
In some embodiments, the first actuator is a hydraulic ram.
In some embodiments, the second actuator is a hydraulic ram.
In some embodiments, the multiplex valve is a pilot controlled multiplex valve.
In some embodiments, an overflow valve is further arranged at the oil outlet of the rear pump, and the overflow valve flows back to the hydraulic oil tank through the overflow port.
In a third aspect, the invention further provides a construction machine, which comprises the hydraulic system.
Has the advantages that: according to the flow divider valve, the hydraulic system and the engineering machinery provided by the invention, the second pump is added, the flow of the flow dividing valve is automatically adjusted according to the flow change of the second pump and the action of the operation element, so that the requirement of high flow rate of the first double-pump flow dividing of the operation element is ensured, the stability of two-phase flow dividing of the operation element is ensured, the first pump supplies oil when the two flow rates of the pump are high, the second pump unloads, and the double pumps merge when the two flow rates of the pump are insufficient, thereby reducing energy waste and avoiding the harm caused by the high flow rate. When the system pressure exceeds a certain value, the two-way pump is unloaded through the throttling valve, so that the torque required by the first pump and the second pump is controlled within a certain range, and the output of a power source is not influenced.
Drawings
FIG. 1 is a schematic diagram of a diverter valve according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a hydraulic system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first pump in an embodiment;
in the figure: the hydraulic control system comprises a
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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 relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
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