Four-quadrant radial piston hydraulic device and working method thereof

A four-quadrant radial piston hydraulic device, comprising:

• a housing;
• plunger assemblies;
• an eccentric spindle rotatably disposed on the housing;
• pilot-operated check valves one-to-one corresponding to the plunger assemblies;
• and
• two-way cartridge valves one-to-one corresponding to the plunger assemblies;
• wherein the housing defines plunger cavities, an eccentric spindle cavity, pilot-operated check valve cavities, two-way cartridge valve cavities, high-pressure oil-ways of the housing, low-pressure oil-ways, and control oil-ways therein;
• the pilot-operated check valve cavities and the two-way cartridge valve cavities respectively one-to-one correspond to the plunger assemblies;
• each of the plunger assemblies is slidably disposed in a corresponding plunger cavity along a vertical direction;
• the eccentric spindle is rotatably assembled in the eccentric spindle cavity, and is in transmission connection with the plunger assemblies;
• wherein the four-quadrant radial piston hydraulic device further comprises a distribution shaft and a confluence plate;
• the distribution shaft is inserted into the eccentric spindle, and a reversing slide valve is disposed on the confluence plate;
• wherein the distribution shaft defines a first distribution ring groove, a second distribution ring groove, and a third distribution ring groove thereon;
• the first distribution ring groove, the second distribution ring groove, and the third distribution ring groove are communicated with a high-pressure main port or a low-pressure main port;
• the distribution shaft defines a first distribution semi-ring groove, a second distribution semi-ring groove, a first oil hole, and a second oil hole thereon;
• the first oil hole is communicated with the second distribution semi-ring groove and the second distribution ring groove;
• the second oil hole is communicated with the first distribution semi-ring groove, the first distribution ring groove, and the third distribution ring groove;
• wherein the confluence plate defines a high-pressure ring groove, a low-pressure ring groove, a reversing slide valve cavity, control oil-ways of the confluence plate, and the reversing slide valve thereon;
• the high-pressure ring groove defines a high-pressure ring groove hole thereon, and the low-pressure ring groove defines a low-pressure ring groove hole thereon;
• a first side of the reversing slide valve cavity is communicated with the high-pressure ring groove and the low-pressure ring groove respectively by the high-pressure ring groove hole and the low-pressure ring groove hole;
• a second side of the reversing slide valve cavity is communicated with the first distribution ring groove, the second distribution ring groove, and the third distribution ring groove;
• the reversing slide valve is inserted in the reversing slide valve cavity;
• the reversing slide valve is configured to enable the high-pressure ring groove to switch between being communicated with the first distribution ring groove and being communicated with the second distribution ring groove, and to enable the low-pressure ring groove to switch between being communicated with the second distribution ring groove and being communicated with the third distribution ring groove;
• wherein each of the pilot-operated check valves is disposed in a corresponding pilot-operated check valve;
• each of the two-way cartridge valves is disposed in a corresponding two-way cartridge valve cavity;
• the pilot-operated check valves and the two-way cartridge valves are connected with the high-pressure oil-ways, the low-pressure oil-ways, and the control oil-ways of the housing;
• each of the pilot-operated check valves comprises a first control oil cavity, a first high-pressure oil cavity, and a first low-pressure oil cavity;
• each first high-pressure oil cavity is communicated with a corresponding plunger cavity;
• each first low-pressure oil cavity is communicated with the low-pressure ring groove;
• each first control oil cavity is alternately communicated with the first distribution semi-ring groove and the second distribution semi-ring groove;
• when each first control oil cavity and each first high-pressure oil cavity are subjected to high pressure simultaneously, each first high-pressure oil cavity is communicated with a corresponding first low-pressure oil cavity;
• each of the two-way cartridge valves comprises a second control oil cavity, a second high-pressure oil cavity, and a second low-pressure oil cavity;
• each second low-pressure oil cavity is communicated with a corresponding plunger cavity;
• each second high-pressure oil cavity is communicated with the high-pressure ring groove;
• each second control oil cavity is alternately communicated with the first distribution semi-ring groove and the second distribution semi-ring groove;
• when each second control oil cavity and each second high-pressure oil cavity are subjected to high pressure simultaneously, each second high-pressure oil cavity and each first low-pressure oil cavity are closed.