阅读说明：本技术 压力流量自动控制快换液压系统 (Pressure flow automatic control quick-change hydraulic system ) 是由 崔广伟 李乾坤 蔡振旭 于 2021-05-20 设计创作，主要内容包括：一种压力流量自动控制快换液压系统,包括主阀组件、主泵组件、快换组件和控制器,主泵组件包括主泵A和主泵B,主阀组件包括主阀A和主阀B,主泵A通过液压管路与主阀A连接,主泵B通过液压管路与主阀B连接；控制器的输入端连接快换操作开关,快换操作开关连接快换换向阀线圈；控制器的输出端连接主泵B和主阀B；将快换控制开关的控制信号引入控制器,从而在进行快换操作时,控制器同时向主泵控制比例阀和主阀加载阀发出控制指令输出流量,从而满足快换系统的液压需求,提升快换油缸的伸出速度和夹紧力,同时可以根据不同的快换机具,输出不同的流量和压力,起到节能效果。(A pressure flow automatic control quick-change hydraulic system comprises a main valve component, a main pump component, a quick-change component and a controller, wherein the main pump component comprises a main pump A and a main pump B, the main valve component comprises a main valve A and a main valve B, the main pump A is connected with the main valve A through a hydraulic pipeline, and the main pump B is connected with the main valve B through a hydraulic pipeline; the input end of the controller is connected with a quick-change operating switch, and the quick-change operating switch is connected with a quick-change reversing valve coil; the output end of the controller is connected with a main pump B and a main valve B; the control signal of the quick-change control switch is introduced into the controller, so that when the quick-change operation is carried out, the controller simultaneously sends a control instruction to the main pump control proportional valve and the main valve loading valve to output flow, the hydraulic requirement of a quick-change system is met, the extension speed and the clamping force of the quick-change oil cylinder are improved, meanwhile, different flow and pressure can be output according to different quick-change machines and tools, and the energy-saving effect is achieved.)

1. The utility model provides a pressure flow automatic control quick change hydraulic system, includes main valve module, main pump subassembly, quick change subassembly and controller, its characterized in that: the main pump assembly comprises a main pump A and a main pump B, the main valve assembly comprises a main valve A and a main valve B, the main pump A is connected with the main valve A through a hydraulic pipeline, and the main pump B is connected with the main valve B through a hydraulic pipeline; the quick-change assembly comprises a quick-change reversing valve and a quick-change oil cylinder, and an oil inlet of the quick-change reversing valve is connected with the main pump B and the main valve B through a hydraulic pipeline; the input end of the controller is connected with a quick-change operating switch, and the quick-change operating switch is connected with a quick-change reversing valve coil; the output end of the controller is connected with the main pump B and the main valve B.

2. The pressure-flow automatic control quick-change hydraulic system according to claim 1, characterized in that: the main pump B is connected with a main pump B control proportional valve, and the output end of the controller is connected with a main pump B control proportional valve coil.

3. The pressure-flow automatic control quick-change hydraulic system according to claim 1 or 2, characterized in that: the main valve B is only provided with a main valve B loading valve, and the controller controls the main valve B by connecting a main valve B loading valve coil.

4. The pressure-flow automatic control quick-change hydraulic system according to claim 1, characterized in that: the main pump B is connected with a pilot pump.

5. The pressure-flow automatic control quick-change hydraulic system according to claim 1, characterized in that: the quick-change operating switch is connected with the storage battery.

Technical Field

The invention belongs to the technical field of quick-change hydraulic systems of excavators, and particularly relates to a pressure flow automatic control quick-change hydraulic system.

Background

At present, the quick-change hydraulic system of the domestic excavator mainly has two schemes. A pilot pump supplies oil to a quick-change system, and has the defects of small clamping force of a quick-change clamp and unreliable performance. One is to supply oil to a quick-change system by a main valve, and the defects are that when the quick-change operation is carried out, all valve cores are in a middle position, the pressure of the main valve is unloaded at the moment, no pilot signal exists in a pipeline, and due to the energy-saving design, a controller automatically reduces the discharge capacity of a main pump to the minimum, so that the quick-change operation speed is low, the clamping force is small, and the operation is influenced.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a pressure and flow automatic control quick-change hydraulic system, which solves the problems of low speed and small clamping force of a quick-change system.

The technical scheme adopted by the invention is as follows: a pressure flow automatic control quick-change hydraulic system comprises a main valve assembly, a main pump assembly, a quick-change assembly and a controller, wherein the main pump assembly comprises a main pump A and a main pump B, the main valve assembly comprises a main valve A and a main valve B, the main pump A is connected with the main valve A through a hydraulic pipeline, and the main pump B is connected with the main valve B through a hydraulic pipeline; the quick-change assembly comprises a quick-change reversing valve and a quick-change oil cylinder, and an oil inlet of the quick-change reversing valve is connected with the main pump B and the main valve B through a hydraulic pipeline; the input end of the controller is connected with a quick-change operating switch, and the quick-change operating switch is connected with a quick-change reversing valve coil; the output end of the controller is connected with the main pump B and the main valve B.

Preferably, the main pumps B respectively control the proportional valves, and the output end of the controller is connected with the coil of the proportional valve controlled by the main pump B.

Preferably, the main valve B is only provided with a main valve B loading valve, and the controller controls the main valve B by connecting a main valve B loading valve coil.

Preferably, the main pump B is connected with a pilot pump.

Preferably, the quick-change operating switch is respectively connected with the storage battery and the quick-change reversing valve coil.

The invention has the beneficial effects that: the control signal of the quick-change control switch is introduced into the controller, so that when the quick-change operation is carried out, the controller simultaneously sends a control instruction to the main pump control proportional valve and the main valve loading valve to output flow, the hydraulic requirement of a quick-change system is met, the extension speed and the clamping force of the quick-change oil cylinder are improved, meanwhile, different flow and pressure can be output according to different quick-change machines and tools, and the energy-saving effect is achieved.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

in the figure, 1, main pumps A and 2, main pumps B and 3, a pilot pump, 4, a main pump B control proportional valve, 5, a main valve assembly, 6, main valves A and 7, main valves B and 8, a main valve B loading valve, 9, a quick-change oil cylinder, 10, a quick-change reversing valve, 11, a quick-change reversing valve coil, 12, a quick-change operating switch, 13, a storage battery, 14, a controller, 15, a main pump B control proportional valve coil, 16 and a main valve B loading valve coil.

Detailed Description

For further explanation of the technical details of the present invention and the advantages thereof, reference is now made to the accompanying drawings.

As shown in fig. 1, a pressure-flow automatic control quick-change hydraulic system includes a main valve assembly 5, a main pump assembly, a quick-change assembly and a controller 14, where the main pump assembly includes a main pump a and a main pump B, the main pump a is connected to the main valve a through a hydraulic line, and the main pump B is connected to the main valve B through a hydraulic line; the quick-change assembly comprises a quick-change reversing valve 10 and a quick-change oil cylinder 9, and an oil inlet of the quick-change reversing valve 10 is connected with the main pump B and the main valve B through hydraulic pipelines; the input end of the controller 14 is connected with a quick-change operating switch 12, and the quick-change operating switch 12 is connected with a quick-change reversing valve coil 10; the output end of the controller 14 is connected with the main pump B and the main valve B.

In this embodiment, the main pump B controls the proportional valve 4, and the output end of the controller 14 is connected to the coil 15 of the proportional valve; the main valve B is only provided with a main valve B loading valve 8, and the controller 14 controls the main valve B by connecting a main valve B loading valve coil 16; the main pump B is connected with a pilot pump 3; the quick-change operating switch 12 is respectively connected with the storage battery 13 and the quick-change reversing valve coil 11.

When the quick-change operation is carried out, the quick-change operation switch 12 is pressed down, a working signal is sent to the quick-change reversing valve coil 11 and the controller 14, the quick-change reversing valve coil 11 is electrified, the quick-change reversing valve 10 is reversed, the controller 14 outputs proper current to control the main pump B to control the proportional valve 15 and the main valve B loading coil, the main pump B and the main valve B are controlled to output proper flow and pressure to meet the hydraulic requirements of a quick-change system, the extending speed and the clamping force of a quick-change oil cylinder are improved, meanwhile, different flow and pressure can be output according to different quick-change machines, and the energy-saving effect is achieved. When the main pump B and the main valve B supply oil to the quick-change system, the main pump A and the main valve A can still supply oil to other mechanisms continuously, and the stability of the system is maintained.