CN-115783041-B - Hydraulic system for locking middle position of electric control steering shaft and crane

CN115783041BCN 115783041 BCN115783041 BCN 115783041BCN-115783041-B

Abstract

The invention discloses a hydraulic system for locking the middle position of an electric control steering shaft, wherein a P1 port of a hydraulic control selection valve is connected with a steering oil pump I, a P2 port of the hydraulic control selection valve is connected with a plunger variable pump, a B port of the hydraulic control selection valve is connected with an energy accumulator, the energy accumulator is connected with an electric control shaft locking hydraulic circuit and provides high-pressure oil to lock the middle position of an electric control shaft middle position locking oil cylinder, a1 port of a double-circuit steering gear is connected with an A port of the hydraulic control selection valve, a second steering oil pump is connected with a1 port of the other circuit of the double-circuit steering gear, and 2 ports of the double-circuit steering gear are both used for oil return, and steering left and right oil cylinders of the mechanical steering shaft are connected with a high-pressure oil port of the double-circuit steering gear to realize hydraulic power assisted steering of the steering gear.

Inventors

ZHAO LIUFU
LIU BAOLUAN
MA YUNWANG
YANG FENGLING
MA FEI

Assignees

徐州重型机械有限公司

Dates

Publication Date: 20260505
Application Date: 20221202

Claims (7)

1. A hydraulic system for locking the position of an electronically controlled steering shaft, the system comprising: The hydraulic control selection valve (6), the P1 port of the hydraulic control selection valve (6) is connected with a steering oil pump I (13), the P2 port is connected with a plunger variable pump (12) to provide a high-pressure oil source for the double-loop steering gear and realize the hydraulic power-assisted steering function of the double-loop steering gear, and the B port of the hydraulic control selection valve (6) is connected with an energy accumulator (5); the energy accumulator (5) is connected with the electric control axle locking hydraulic circuit and provides high-pressure oil to lock the middle position of the electric control axle middle position locking oil cylinder (16); the double-loop steering device (7) is characterized in that a1 oil port of the double-loop steering device (7) is connected with an A port of the hydraulic control selection valve (6); The steering oil pump II (14), the steering oil pump II (14) is connected with the oil port 1 of the other loop of the double-loop steering gear (7), and the oil ports 2 of the double-loop steering gear (7) are all used for oil return; the steering left and right oil cylinders of the mechanical steering shaft (8) are connected with a high-pressure oil port of the double-loop steering gear (7) to realize hydraulic power-assisted steering of the steering gear; The electric control axle locking hydraulic circuit comprises a first control valve group (1), a second control valve group left (2), an electric control steering shaft I (4), a second control valve group right (9) and an electric control steering shaft II (11); The oil port P of the first control valve group (1) is connected with an oil pump and used for providing steering hydraulic power for the first electric control steering shaft (4) and the second electric control steering shaft (11), the oil port T is used for oil return, the oil port A of the first control valve group (1) is respectively connected with the oil ports A1 of the left (2) and the right (9) of the second control valve group, and the oil port B of the first control valve group (1) is connected with the oil ports A2 of the left (2) and the right (9) of the second control valve group; The B1 oil ports of the left control valve bank (2) and the right control valve bank (9) are in cross connection with rodless cavities and rod cavities of steering cylinders (15) on two sides of the first electric control steering shaft (4) and the second electric control steering shaft (11), and the B2 oil ports of the left control valve bank (2) and the right control valve bank (9) are in cross connection with the rod cavities and the rodless cavities of the steering cylinders (15) on two sides of the first electric control steering shaft (4) and the second electric control steering shaft (11).
2. The hydraulic system for locking the middle position of the electric control steering shaft according to claim 1, wherein high-pressure oil at the output end of the energy accumulator (5) enters a third control valve group left (3) and a third control valve group right (10) which are connected from P oil ports of a second control valve group left (2) and a second control valve group right (9) respectively and is used for controlling a middle position locking oil cylinder (16).
3. The hydraulic system for locking the middle position of the electric control steering shaft according to claim 2, wherein the oil port B of the left control valve group (3) and the oil port B of the right control valve group (10) are connected with a rod cavity of the middle position locking oil cylinder (16), and the oil port A is connected with a rodless cavity of the middle position locking oil cylinder (16).
4. The hydraulic system for locking the middle position of the electric control steering shaft according to claim 2, wherein the end part of a piston rod of the steering oil cylinder (15) is connected with a steering rocker arm (17), one end of the steering rocker arm (17) is connected with a middle position locking oil cylinder (16), and the other end of the steering rocker arm is connected with a steering knuckle arm through a steering pull rod (18).
5. The hydraulic system for locking the middle position of the electric control steering shaft according to claim 2, wherein the T oil ports of the left control valve group (3) and the right control valve group (10) are connected with the T oil ports of the left control valve group (2) and the right control valve group (9) in parallel to form a loop.
6. The hydraulic system for locking the position of an electrically controlled steering shaft according to claim 1, characterized in that the 2-port of the double-circuit steering (7) forms a circuit as an oil return port.
7. A crane comprising a hydraulic system according to any one of claims 1-6.

Description

Hydraulic system for locking middle position of electric control steering shaft and crane Technical Field The invention relates to a hydraulic system for locking the middle position of an electric control steering shaft and a crane, and belongs to the technical field of engineering machinery. Background At present, with the development of domestic and foreign infrastructures, the technical research level of engineering machinery vehicles is improved unprecedentedly, and the steering technology and the design level of the multi-axis engineering machinery vehicles show a rapid development trend. The steering system of the multi-axis engineering machinery vehicle generally comprises a mechanical driving steering device, a hydraulic driving steering device, a steering control device and the like, and along with the continuous development of technology, the steering system introduces electric control steering, and the axle used by the whole vehicle at present can be divided into a mechanical steering shaft and an electric control steering shaft according to whether the vehicle is steered or not. The mechanical steering shafts are connected with each other through a mechanical rod system to ensure the corner relation of wheels among the mechanical shafts, the electric control steering shafts realize the control of the corners of the shafts through an electric control means, and finally, the tire corners in the whole steering process of the vehicle accord with the Ackerman steering relation. The steering mechanism realizes the steering function of the whole vehicle in running, but in order to ensure the high-speed stability and the safety in the running process of the whole vehicle, the electric control steering axle generally realizes the median locking after the vehicle speed is higher than a certain degree, and does not follow a shaft to steer, and in order to realize the median locking function, the electric control steering axles in the vehicles in domestic and foreign industries are all provided with a steering median locking oil cylinder for the median locking of the electric control steering axle when the vehicle is at high speed. At present, a steering hydraulic system of an electric control steering axle of a multi-axle vehicle is generally divided into a constant pressure variable system and a load sensitive system, wherein an oil pump device in the constant pressure variable system adopts a constant pressure plunger variable pump, and the constant pressure plunger variable pump can realize the functions of tire steering and middle position locking of the electric control axle, so that oil is supplied by the pump; the oil pump device in the load-sensitive system adopts a load-sensitive pump which can provide tire steering oil for an electric control axle, and has the advantages that corresponding pressure oil sources are provided according to actual loads, when no load acts, only low pressure standby pressure exists, heat is less generated, energy consumption is low, but the system cannot meet the constant high-pressure oil source required by the tire median locking oil cylinder, so that the existing engineering machinery vehicle generally adopts a plunger pump or gear pump which can provide constant high pressure to meet the tire median locking oil cylinder oil for the electric control steering axle. At present, when the function of a middle position locking oil cylinder in a steering hydraulic system of an electric control steering axle of a chassis of a multi-axle engineering machinery vehicle is adopted, a constant pressure variable pump is commonly used with a tire steering power-assisted oil cylinder hydraulic system, or a steering oil pump is independently arranged, so that constant high-pressure oil sources are continuously provided for the middle position locking oil cylinder of the electric control steering axle, and the middle position locking function is realized. The arrangement scheme can enable the hydraulic system to generate more heat, is high in energy consumption, complex in arrangement space and high in cost, and solves the problems that the chassis hydraulic oil pump is difficult to take out force and use, and the like, so that difficulties are brought to overall matching and design of the vehicle. Disclosure of Invention The invention aims to provide a hydraulic system for locking the middle position of an electric control steering shaft and a crane, which are used for solving the defects that the hydraulic system generates more heat, has high energy consumption, complex arrangement space and high cost and is difficult to take out power from a chassis hydraulic oil pump by adopting a constant pressure variable pump shared with a tire steering power-assisted oil cylinder hydraulic system or arranging a steering oil pump independently in the prior art. A hydraulic system for position locking in an electronically controlled steering shaft, the system comprising: the hydraulic control