CN-122014696-A - Hydraulic cylinder proportion control loop and hydraulic machine

Abstract

The invention relates to the technical field of hydraulic power, and particularly discloses a hydraulic cylinder proportional control loop and a hydraulic machine. The hydraulic cylinder proportion control loop comprises a liquid filling oil tank, a hydraulic cylinder, an oil pipe group and a control valve group, wherein the oil pipe group is provided with a first interface, a second interface, a total oil return port, a total pump oil port, a total control oil port and a total oil drain port. The control valve group comprises an oil return cartridge valve, a first cartridge valve group, a second cartridge valve group and a proportional valve, wherein a total oil return port is connected with a first port through the oil return cartridge valve in an on-off mode, a total pump oil port and a total oil return port are communicated with an A port of the proportional valve in a switching mode through the first cartridge valve group, and the first port and the second port are communicated with a B port of the proportional valve in a switching mode through the second cartridge valve group. By adopting the hydraulic control system, the expansion speed of the main cylinder during expansion and contraction can be effectively controlled, the working accuracy of the main cylinder during pressurization, pressure maintaining and pressure relief can be controlled, and the hydraulic circuit can be ensured to effectively meet the working requirements of the hydraulic machine.

Inventors

• WEI JUN
• HUANG ZHONGHUA
• GUO LIANGYI

Assignees

• 科达制造股份有限公司

Dates

Publication Date

20260512

Application Date

20260105

Claims (11)

1. 1. The hydraulic cylinder proportion control loop is characterized by comprising a liquid filling oil tank, a hydraulic cylinder, an oil pipe group and a control valve group, wherein the liquid filling oil tank is communicated with the hydraulic cylinder through the direction control valve group, the oil pipe group is provided with a first interface, a second interface, a total oil return port, a total pump oil port, a total control oil port and a total oil drain port, the first interface is communicated with a rod cavity of the hydraulic cylinder, the second interface is communicated with a rodless cavity of the hydraulic cylinder, and the direction control valve group is used for switching the direction of an oil path between the liquid filling oil tank and the hydraulic cylinder; The control valve group comprises an oil return cartridge valve, a first cartridge valve group, a second cartridge valve group and a proportional valve, and the total oil return port is connected with the first interface in an on-off manner through the oil return cartridge valve; The total pump oil port and the total oil return port are communicated with an A port of the proportional valve in a switching way through the first cartridge valve group, and the first interface and the second interface are communicated with a B port of the proportional valve in a switching way through the second cartridge valve group; The total control oil port is respectively communicated with the oil control port of the first cartridge valve group and the oil control port of the second cartridge valve group, and the oil control port of the first cartridge valve group and the oil control port of the second cartridge valve group are respectively communicated with the total oil drain port; The proportional valve is used for proportionally controlling the flow of an oil way between the first cartridge valve group and the second cartridge valve group.
2. 2. The hydraulic cylinder proportional control circuit of claim 1, wherein the first cartridge valve group comprises a second cartridge valve and a third cartridge valve, wherein an A port of the second cartridge valve is communicated with the total oil return port, an A port of the third cartridge valve is communicated with the total pump oil port, and a B port of the second cartridge valve and a B port of the third cartridge valve are communicated with the proportional valve in a switching manner; The total control oil port is communicated with the X port of the second cartridge valve and the X port of the third cartridge valve in a switching way; and the X port of the second cartridge valve and the X port of the third cartridge valve are communicated with the total oil drain port in a switching way.
3. 3. The hydraulic cylinder proportional control circuit of claim 2, wherein a first reversing valve is disposed between the X port of the second cartridge valve and the X port of the third cartridge valve, the first reversing valve forming at least a first station and a second station; When the first station is powered on, the X port of the second cartridge valve is communicated with the total oil drain port, and the X port of the third cartridge valve is communicated with the total control oil port; when the first station is powered on, the X port of the second cartridge valve is communicated with the total control oil port, and the X port of the third cartridge valve is communicated with the total oil drain port.
4. 4. The hydraulic cylinder ratio control loop of claim 1 wherein the second cartridge valve group includes a fourth cartridge valve and a fifth cartridge valve, the port B of the fourth cartridge valve being in communication with the first port, the port B of the fifth cartridge valve being in communication with the second port, the port a of the fourth cartridge valve, the port a of the fifth cartridge valve being in switched communication with the port B of the proportional valve; The total control oil port is communicated with the X port of the fourth cartridge valve and the X port of the fifth cartridge valve in a switching way; and the X port of the fourth cartridge valve and the X port of the fifth cartridge valve are communicated with the total oil drain port in a switching way.
5. 5. The hydraulic cylinder proportional control circuit of claim 4, wherein a second reversing valve is disposed between the X port of the fourth cartridge valve and the X port of the fifth cartridge valve, the second reversing valve forming at least a third station and a fourth station; When the third station is powered on, the X port of the fourth cartridge valve is communicated with the total control oil port, and the X port of the fifth cartridge valve is communicated with the total oil drain port; When the fourth station is powered on, the X port of the fourth cartridge valve is communicated with the total oil drain port, and the X port of the fifth cartridge valve is communicated with the total control oil port.
6. 6. The hydraulic cylinder proportional control circuit of claim 5, wherein an oil inlet of the second reversing valve is provided with a first shuttle valve, a first inlet of the first shuttle valve is communicated with the first port, and a second inlet of the first shuttle valve is communicated with the total control oil port.
7. 7. The hydraulic cylinder proportional control circuit of claim 4, wherein a pressure sensor is disposed between port B of the fifth cartridge valve and the second port, and wherein the hydraulic cylinder is provided with a displacement sensor.
8. 8. The hydraulic cylinder proportional control circuit of claim 1, wherein port a of the oil return cartridge valve communicates with the total oil return port and port B of the oil return cartridge valve communicates with the first port; The X port of the oil return cartridge valve is provided with a third reversing valve, the third reversing valve is at least provided with a fifth station and a sixth station, when the sixth station is powered on, the X port of the oil return cartridge valve is communicated with the total control oil port, and when the fifth station is powered on, the X port of the oil return cartridge valve is communicated with the total oil drain port.
9. 9. The hydraulic cylinder proportional control circuit of claim 8, wherein the oil return cartridge valve is connected in parallel with a relief valve, an inlet of the relief valve is communicated with a rod cavity of the hydraulic cylinder, and an outlet of the relief valve is communicated with the total oil return port.
10. 10. The hydraulic cylinder proportional control circuit of claim 1, wherein the directional control valve block comprises a pilot-operated charge valve and a fourth reversing valve, the pilot-operated charge valve is formed with a first port and a second port, the first port is communicated with the charge tank, the second port is communicated with a rodless cavity of the hydraulic cylinder, and the fourth reversing valve is arranged between an X port of the pilot-operated charge valve and the total control port, and the fourth reversing valve is formed with at least a seventh station and an eighth station; When the eighth station is powered on, the X port of the hydraulic control charging valve is disconnected with the main control oil port; when the seventh station is powered on, the X port of the hydraulic control charging valve is communicated with the total control oil port.
11. 11. A hydraulic machine comprising a hydraulic cylinder proportional control circuit as claimed in any one of claims 1 to 10.

Description

Hydraulic cylinder proportion control loop and hydraulic machine Technical Field The invention relates to the technical field of hydraulic power, in particular to a hydraulic cylinder proportional control loop and a hydraulic machine. Background The existing hydraulic machine generally adopts a valve control system comprising a three-way proportional valve and a two-way proportional valve to realize a speed control function, wherein the three-way proportional valve controls the descending and ascending speeds of the movable beam, and the two-way proportional valve controls the pressurizing and pressure maintaining speeds of the movable beam. However, in the practical application process of the valve control system, impact is large when the main cylinder stretches and contracts and when the main cylinder discharges pressure, accuracy is low when the main cylinder discharges pressure, set pressure is easily exceeded, and practical use requirements of the hydraulic machine cannot be met. Disclosure of Invention The invention aims to overcome the defects of the prior art, and provides a hydraulic cylinder proportional control loop and a hydraulic machine, which can effectively control the expansion speed of a main cylinder during expansion and contraction and the working accuracy of the main cylinder during pressurization, pressure maintaining and pressure relief, so that the hydraulic loop can effectively meet the working requirements of the hydraulic machine. In order to solve the technical problems, the first aspect of the invention provides a hydraulic cylinder proportional control loop, which comprises a liquid filling oil tank, a hydraulic cylinder, an oil pipe group and a control valve group, wherein the liquid filling oil tank is communicated with the hydraulic cylinder through a direction control valve group, the oil pipe group is formed with a first interface, a second interface, a total oil return port, a total pump oil port, a total control oil port and a total oil drain port, the first interface is communicated with a rod cavity of the hydraulic cylinder, the second interface is communicated with a rodless cavity of the hydraulic cylinder, and the direction control valve group is used for switching the direction of an oil path between the liquid filling oil tank and the hydraulic cylinder; The control valve group comprises an oil return cartridge valve, a first cartridge valve group, a second cartridge valve group and a proportional valve, and the total oil return port is connected with the first interface in an on-off manner through the oil return cartridge valve; The total pump oil port and the total oil return port are communicated with an A port of the proportional valve in a switching way through the first cartridge valve group, and the first interface and the second interface are communicated with a B port of the proportional valve in a switching way through the second cartridge valve group; The total control oil port is respectively communicated with the oil control port of the first cartridge valve group and the oil control port of the second cartridge valve group, and the oil control port of the first cartridge valve group and the oil control port of the second cartridge valve group are respectively communicated with the total oil drain port; The proportional valve is used for proportionally controlling the flow of an oil way between the first cartridge valve group and the second cartridge valve group. As an improvement of the scheme, the first cartridge valve group comprises a second cartridge valve and a third cartridge valve, wherein an A port of the second cartridge valve is communicated with the total oil return port, an A port of the third cartridge valve is communicated with the total pump oil port, and a B port of the second cartridge valve and a B port of the third cartridge valve are communicated with the proportional valve in a switching manner; The total control oil port is communicated with the X port of the second cartridge valve and the X port of the third cartridge valve in a switching way; and the X port of the second cartridge valve and the X port of the third cartridge valve are communicated with the total oil drain port in a switching way. As an improvement of the scheme, a first reversing valve is arranged between the X port of the second cartridge valve and the X port of the third cartridge valve, and the first reversing valve is at least provided with a first station and a second station; When the first station is powered on, the X port of the second cartridge valve is communicated with the total oil drain port, and the X port of the third cartridge valve is communicated with the total control oil port; when the second station is powered on, the X port of the second cartridge valve is communicated with the total control oil port, and the X port of the third cartridge valve is communicated with the total oil drain port. As an improvement of the scheme, the second cart