阅读说明：本技术 挖掘机高压大流量油缸再生液压系统 (High-pressure large-flow oil cylinder regeneration hydraulic system of excavator ) 是由 石立京 王勇 夏书强 李寿鹏 吕建森 周显 孙文庆 刘松阳 周开坤 于 2021-08-31 设计创作，主要内容包括：挖掘机高压大流量油缸再生液压系统,包括液压油缸,液压油缸的大腔和小腔之间设有插装阀,插装阀连接有液控换向阀,液控换向阀通过电磁换向阀进行控制,电磁换向阀通过先导溢流阀和齿轮泵连接有液压油箱,液压油缸的大腔和液压油箱之间设有节流阀,还包括控制电磁换向阀的控制器。本发明的挖掘机高压大流量油缸再生液压系统,通过插装阀和液控换向阀相结合的方式,由电磁换向阀控制液控换向阀换向,从而控制插装阀打开与关闭,当插装阀关闭时,液压油缸大小腔独立工作,互不干扰；当插装阀打开时,液压油缸大小腔联通,实现了液压油缸油液再生功能,提升液压油缸动作速度,降低发动机能耗,提升整机可靠性。(The high-pressure large-flow oil cylinder regeneration hydraulic system of the excavator comprises a hydraulic oil cylinder, wherein a cartridge valve is arranged between a large cavity and a small cavity of the hydraulic oil cylinder, the cartridge valve is connected with a hydraulic control reversing valve, the hydraulic control reversing valve is controlled through an electromagnetic reversing valve, the electromagnetic reversing valve is connected with a hydraulic oil tank through a pilot overflow valve and a gear pump, a throttle valve is arranged between the large cavity of the hydraulic oil cylinder and the hydraulic oil tank, and the hydraulic oil cylinder regeneration hydraulic system further comprises a controller for controlling the electromagnetic reversing valve. According to the high-pressure large-flow oil cylinder regeneration hydraulic system of the excavator, the hydraulic control reversing valve is controlled to reverse by the electromagnetic reversing valve in a mode of combining the cartridge valve and the hydraulic control reversing valve, so that the cartridge valve is controlled to be opened and closed, and when the cartridge valve is closed, the large cavity and the small cavity of the hydraulic oil cylinder work independently without mutual interference; when the cartridge valve is opened, the large cavity and the small cavity of the hydraulic oil cylinder are communicated, so that the oil regeneration function of the hydraulic oil cylinder is realized, the action speed of the hydraulic oil cylinder is increased, the energy consumption of an engine is reduced, and the reliability of the whole machine is improved.)

1. Excavator high pressure large-traffic hydro-cylinder regeneration hydraulic system, its characterized in that: the hydraulic control hydraulic cylinder is characterized by comprising a hydraulic oil cylinder (1), a cartridge valve (2) is arranged between a large cavity and a small cavity of the hydraulic oil cylinder (1), the cartridge valve (2) is connected with a hydraulic control reversing valve (3), the hydraulic control reversing valve (3) is controlled through an electromagnetic reversing valve (4), the electromagnetic reversing valve (4) is connected with a hydraulic oil tank (7) through a pilot overflow valve (5) and a gear pump (6), a throttle valve (8) is arranged between the large cavity of the hydraulic oil cylinder (1) and the hydraulic oil tank (7), and the hydraulic control hydraulic cylinder further comprises a controller for controlling the electromagnetic reversing valve (4).

2. The excavator high pressure high flow rate cylinder regenerative hydraulic system of claim 1, characterized in that: and a valve core of the cartridge valve (2) is provided with an adjustable throttle valve and a one-way valve.

3. The excavator high pressure high flow rate cylinder regenerative hydraulic system of claim 1, characterized in that: the hydraulic control reversing valve (3) is a two-position two-way hydraulic control reversing valve, and two oil ports of the hydraulic control reversing valve (3) are respectively connected with the tail end of the cartridge valve (2) and the small cavity of the hydraulic oil cylinder (1).

4. The excavator high pressure high flow rate cylinder regenerative hydraulic system of claim 1, characterized in that: the electromagnetic directional valve (4) is a two-position three-way electromagnetic directional valve, and the electromagnetic directional valve (4) is connected to the control end of the hydraulic control directional valve (3).

5. The excavator high pressure high flow rate cylinder regenerative hydraulic system of claim 1, characterized in that: the pilot overflow valve (5) arranged between the electromagnetic directional valve (4) and the hydraulic oil tank (7) controls the system pressure to be 3.9 Mpa.

6. The excavator high pressure high flow rate cylinder regenerative hydraulic system of claim 1, characterized in that: the throttle valve (8) is an adjustable throttle valve.

7. The excavator high pressure high flow rate cylinder regenerative hydraulic system of claim 1, characterized in that: the controller participates in controlling the extension and retraction of a guide rod of the hydraulic oil cylinder (1) and controls the electromagnetic directional valve (4) to lose power in a related mode.

Technical Field

The invention relates to the technical field of engineering machinery transmission systems, in particular to a high-pressure large-flow oil cylinder regeneration hydraulic system of an excavator.

Background

The working device of the ultra-large hydraulic excavator is large in mass, when the movable arm is operated to descend or the bucket rod is operated to retract, the movable arm and the bucket rod can automatically fall due to dead weight, in order to control the movement speed of the movable arm and the bucket rod, the gravity of a structural part needs to be balanced through throttling backpressure, at the moment, the pressure of an oil supply side of an oil cylinder is very low, the flow of an outlet of a main pump only meets the condition that the oil supply side of the oil cylinder does not suck air, the oil return side of the oil cylinder returns to a hydraulic oil tank through throttling, a large amount of heat can be generated through throttling, and then the heat is radiated through a heat radiation system, so that the efficiency of a hydraulic system of the ultra-large hydraulic excavator is low; meanwhile, for meeting the composite action requirement of the working device, the flow required by the oil supply side of the oil cylinder is larger than the flow provided by the main pump, so that the flow of the oil supply side of the oil cylinder is insufficient, the hydraulic system can have a suction phenomenon, the generated bubbles can damage hydraulic elements, and the reliability of the ultra-large hydraulic excavator is reduced.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a high-pressure large-flow oil cylinder regeneration hydraulic system of an excavator, which has high safety and high reliability.

The invention is realized by the following technical scheme: the high-pressure large-flow oil cylinder regeneration hydraulic system of the excavator comprises a hydraulic oil cylinder, wherein a cartridge valve is arranged between a large cavity and a small cavity of the hydraulic oil cylinder, the cartridge valve is connected with a hydraulic control reversing valve, the hydraulic control reversing valve is controlled through an electromagnetic reversing valve, the electromagnetic reversing valve is connected with a hydraulic oil tank through a pilot overflow valve and a gear pump, a throttle valve is arranged between the large cavity of the hydraulic oil cylinder and the hydraulic oil tank, and the hydraulic system further comprises a controller for controlling the electromagnetic reversing valve.

It further comprises the following steps: and the valve core of the cartridge valve is provided with an adjustable throttle valve and a one-way valve.

The hydraulic control reversing valve is a two-position two-way hydraulic control reversing valve, and two oil ports of the hydraulic control reversing valve are respectively connected with the tail end of the cartridge valve and the small cavity of the hydraulic oil cylinder.

The electromagnetic directional valve is a two-position three-way electromagnetic directional valve and is connected to the control end of the hydraulic control directional valve.

The pilot overflow valve arranged between the electromagnetic directional valve and the hydraulic oil tank controls the system pressure to be 3.9 Mpa.

The throttle valve is an adjustable throttle valve.

The controller participates in controlling the extension and retraction of the hydraulic oil cylinder guide rod and controls the electromagnetic directional valve to lose power in a related mode.

The invention has the following advantages: according to the high-pressure large-flow oil cylinder regeneration hydraulic system of the excavator, the hydraulic control reversing valve is controlled to reverse by the electromagnetic reversing valve in a mode of combining the cartridge valve and the hydraulic control reversing valve, so that the cartridge valve is controlled to be opened and closed, and when the cartridge valve is closed, the large cavity and the small cavity of the hydraulic oil cylinder work independently without mutual interference; when the cartridge valve is opened, the large cavity and the small cavity of the hydraulic oil cylinder are communicated, so that the oil regeneration function of the hydraulic oil cylinder is realized, the action speed of the hydraulic oil cylinder is increased, the energy consumption of an engine is reduced, and the reliability of the whole machine is improved.

Drawings

FIG. 1 is a hydraulic schematic of the present invention;

in the figure: 1. the hydraulic control system comprises a hydraulic oil cylinder, 2, a cartridge valve, 3, a hydraulic control reversing valve, 4, an electromagnetic reversing valve, 5, a pilot overflow valve, 6, a gear pump, 7, a hydraulic oil tank, 8 and a throttle valve.

Detailed Description

The high-pressure large-flow oil cylinder regeneration hydraulic system of the excavator shown in the figure 1 comprises a hydraulic oil cylinder 1, a cartridge valve 2 is arranged between a large cavity and a small cavity of the hydraulic oil cylinder 1, the cartridge valve 2 is connected with a hydraulic control reversing valve 3, the hydraulic control reversing valve 3 is controlled through an electromagnetic reversing valve 4, the electromagnetic reversing valve 4 is connected with a hydraulic oil tank 7 through a pilot overflow valve 5 and a gear pump 6, a throttle valve 8 is arranged between the large cavity of the hydraulic oil cylinder 1 and the hydraulic oil tank 7, and the hydraulic system further comprises a controller for controlling the electromagnetic reversing valve 4. And a pilot overflow valve 5 arranged between the electromagnetic directional valve 4 and the hydraulic oil tank 7 controls the system pressure to be 3.9 MPa. The controller participates in controlling the extension and retraction of the guide rod of the hydraulic oil cylinder 1 and controls the electromagnetic directional valve 4 to lose power in a related mode. The invention relates to a high-pressure large-flow oil cylinder regeneration hydraulic system of an excavator, which comprises a hydraulic oil cylinder, a cartridge valve, a hydraulic control reversing valve, an electromagnetic reversing valve, a pilot overflow valve, a gear pump, a hydraulic oil tank and a throttle valve, wherein large cavities and small cavities of the hydraulic oil cylinder are connected together through the cartridge valve, the large cavities and the small cavities are communicated when the cartridge valve is opened, flow regeneration of the hydraulic oil cylinder is realized, the large cavities and the small cavities do not interfere with each other and work independently when the cartridge valve is closed, the opening and closing of the cartridge valve are controlled by the hydraulic control reversing valve, control oil of the hydraulic control reversing valve is obtained by the hydraulic oil tank through the gear pump and the electromagnetic reversing valve, whether the electromagnetic reversing valve is electrified or not is controlled by a controller, meanwhile, the controller is related to the extension and retraction of a guide rod of the hydraulic oil cylinder, when the guide rod moves towards the large cavity, the electromagnetic reversing valve is electrified, and when the guide rod moves towards the small cavity, the electromagnetic reversing valve is not electrified;

specifically, a gear pump in the system absorbs oil from a hydraulic oil tank, the system pressure is controlled to be 3.9Mpa through a pilot overflow valve, oil is supplied to an electromagnetic directional valve, when a guide rod of a hydraulic oil cylinder moves towards a large cavity, a controller controls an electromagnet of the electromagnetic directional valve to be electrified, oil is controlled to flow to a control end of the hydraulic directional valve through the electromagnetic directional valve and push the hydraulic directional valve to change direction, at the moment, a cartridge valve is opened, the large cavity and the small cavity of the hydraulic oil cylinder are communicated, meanwhile, the oil flows to the small cavity, flow regeneration of the hydraulic oil cylinder is achieved, redundant hydraulic oil in the large cavity of the hydraulic oil cylinder flows back to the hydraulic oil tank through a throttle valve, the action speed of the hydraulic oil cylinder is increased, and the energy consumption of an engine is reduced; when the guide rod of the hydraulic oil cylinder moves towards the small cavity, the controller controls the electromagnetic directional valve not to be electrified, and the control oil cannot flow to the control end of the electromagnetic directional valve through the electromagnetic directional valve, so that the hydraulic directional valve is not switched, the cartridge valve is closed, the large cavity and the small cavity of the hydraulic oil cylinder are not communicated and work independently, the interference is avoided, and the normal work of the hydraulic oil cylinder is ensured.

As shown in figure 1, in the high-pressure large-flow oil cylinder regeneration hydraulic system of the excavator, a valve core of the cartridge valve 2 is provided with an adjustable throttle valve and a one-way valve. The hydraulic control reversing valve 3 is a two-position two-way hydraulic control reversing valve, and two oil ports of the hydraulic control reversing valve 3 are respectively connected with the tail end of the cartridge valve 2 and the small cavity of the hydraulic oil cylinder 1. The high-pressure large-flow cartridge valve can meet the requirements of a hydraulic system and the action speed of the whole machine of the ultra-large excavator; when the hydraulic control reversing valve is at different valve positions, oil between the tail end of the cartridge valve and the small cavity of the hydraulic oil cylinder is in a flowing or static state respectively, when the oil between the tail end of the cartridge valve and the small cavity of the hydraulic oil cylinder flows, a valve core of the cartridge valve is pushed, the cartridge valve is opened, the intercommunication of the large cavity and the small cavity of the hydraulic oil cylinder is realized, otherwise, the cartridge valve is closed, and the large cavity and the small cavity of the hydraulic oil cylinder are different and work independently.

As shown in fig. 1, in the high-pressure large-flow oil cylinder regeneration hydraulic system of the excavator, the electromagnetic directional valve 4 is a two-position three-way electromagnetic directional valve, and the electromagnetic directional valve 4 is connected to the control end of the hydraulic control directional valve 3. The controller controls whether the electromagnetic directional valve is electrified or not according to the extending or retracting action of the hydraulic oil cylinder, so that the intelligent level of the whole excavator is improved.

In the high-pressure large-flow oil cylinder regeneration hydraulic system of the excavator shown in fig. 1, the throttle valve 8 is an adjustable throttle valve. According to the hydraulic oil cylinder, redundant hydraulic oil in the large cavity of the hydraulic oil cylinder directly returns to the hydraulic oil tank through the throttle valve, so that the pressure loss is reduced, hydraulic pipelines are reduced, and the reliability of the whole machine is improved.

The high-pressure large-flow oil cylinder regeneration hydraulic system of the excavator adopts a mode of combining the cartridge valve and the hydraulic control reversing valve, and the hydraulic control reversing valve controls the cartridge valve to open and close, so that the cartridge valve can be ensured to be stably opened and closed under the condition of high pressure and large flow; when the electromagnetic reversing valve is not electrified, the hydraulic control reversing valve does not reverse, so that the cartridge valve is closed, and the large cavity and the small cavity of the hydraulic oil cylinder work independently without mutual interference; when the electromagnetic reversing valve is electrified, the hydraulic control reversing valve is reversed, and when the cartridge valve is opened, the communication of the large cavity and the small cavity of the hydraulic oil cylinder can be realized, the oil regeneration function of the hydraulic oil cylinder is realized, the action speed of the hydraulic oil cylinder is increased, and the composite action operation of the front end working device is realized; controlling whether the electromagnetic directional valve is electrified or not according to the extending or retracting action of the hydraulic oil cylinder, and improving the intelligent level of the whole excavator; redundant hydraulic oil in the large cavity of the hydraulic oil cylinder flows back to the hydraulic oil tank through the throttle valve, so that the pressure loss is reduced, hydraulic pipelines are reduced, and the reliability of the whole machine is improved.