Electric-control multimode steering valve, steering hydraulic control system, and wheel type crane

A steering hydraulic control system comprising a full hydraulic steering device, a safety valve set, a first group of independent steering oil cylinder and a second group of independent steering oil cylinder, wherein the full hydraulic steering device has two groups of oil ports, the first group of which establishes a system circuit with a pressure circuit and an oil circuit respectively, wherein the steering hydraulic control system further comprises the electric-control multimode steering valve comprising:

• a flow distributing and collecting valve, a first electromagnetic exchange valve and a second electromagnetic exchange valve, wherein a valve body of the electric-control multimode steering valve comprises four groups of paired valve oil ports, the flow distributing and collecting valve has a flow collecting port, a first flow distributing port and a second flow distributing port, the first electromagnetic exchange valve and the second electromagnetic exchange valve each has a first oil port, a second oil port and a third oil port, the first oil ports of the first electromagnetic exchange valve and the second electromagnetic exchange valve are respectively communicated with the first group of valve oil ports of the valve body, the second oil ports of the first electromagnetic exchange valve and the second electromagnetic exchange valve are respectively communicated with the second group of valve oil ports of the valve body, the third oil port of the first electromagnetic exchange valve is communicated with the flow collecting port of the flow distributing and collecting valve, the first flow distributing port of the flow distributing and collecting valve and the third oil port of the second electromagnetic exchange valve are respectively communicated with the third group of valve oil ports of the valve body, the second flow distributing port of the flow distributing and collecting valve and the third oil port of the second electromagnetic exchange valve are respectively communicated with the fourth group of valve oil ports of the valve body,
• the first group of valve oil ports of the valve body of the electric-control multimode steering valve is communicated with the second group of oil ports of the full hydraulic steering device, the second group of valve oil ports of the valve body is communicated with the first group of independent steering oil cylinder, the third and fourth groups of valve oil ports of the valve body of the electric-control multimode steering valve are communicated with the first group of independent steering oil cylinder and the second group of independent steering oil cylinder via the safety valve set.