SU444861A1 - Hydraulic drive of the mechanism of rotation of the excavator - Google Patents

Description

one

This invention relates to the field of earthmoving machinery.

Known hydraulic drive mechanism of rotation of the excavator, including power cylinders with rysh- 5 kaki, piston cavities which, communicated with the distributor, are connected by a channel with the chambers of the relief valves.

The purpose of the invention is to provide a permanent braking effect in the process of turning the working equipment of the excavator.

This is achieved by the fact that the piston cavities of the power cylinders are connected to the distributor by means of a valve device built into each cover, and a spring-loaded plunger is mounted in the piston rod of the cylinder. In addition, the valve device is made in the form of a spring-loaded ball valve, the subvalvular cavity of which is communicated by grooves with the piston cavity of the power cylinder and by means of a throttling groove with the line.

The drawing shows a diagram of the hydraulic drive mechanism of the rotation of the excavator,

P1 hydraulic drive includes cylinders I, in the piston rod 2 of which springs 3 are installed and pushers 4 with groove a,

In the lid 5 of each power cylinder, a spring-loaded ball valve 6 is mounted, the subvalvular cavity A of which is connected by grooves b to the piston cavity of the EHF cylinder, Subvallap cavity A is also connected through the throttling groove of C to the channel G, which is distributed to the manifold 7,

The piston cavity B of each power cylinder is also connected via channel d in the cover 5 to the chambers of the relief valves 8

When the working equipment is braked in the middle of rotation, the working fluid from the piston cavity B of one power cylinder flows through channel d in the lid 5 of the same power cylinder, relief valves 8 and channel d in the lid 5 of the second power cylinder to its piston cavity B. When braking the working equipment during its rotation to a position close to the extreme, the pusher 4; the spring 3 of which is pre-compressed stronger than the spring of the ball valve 6, pushes the ball inside the cover b and blocks the free discharge of the working fluid from the piston cavity B of this power cylinder, after which the pusher 4, compressing the spring 3, is played inside the piston rod 2. the fluid from the porsh cavity B comes through grooves b, throttling the groove c and channel d in the lid 5 into the drain line of the distributor 7. At this time, the pressure in the piston cavity B of this power cylinder is stabilized for level by the operation of the bypass valves 8, and the pressure in the piston cavity B of the second power cylinder is equal to the setting pressure of the safety valve of the distributor 7, Since the working equipment is braked both in the middle and at the end of the turn through the bypass valves, the braking effect throughout the entire rotation of the working equipment remains constant. The subject matter of the invention is 1. The hydraulic drive of the excavator rotation mechanism, which includes power cylinders with covers, the piston cavities of which communicated with the distributor, are connected by a channel with the relief valve chambers, different in that in order to provide a constant braking effect of the excavator working equipment the piston cavities of the power cylinders are connected to the distributor by means of a valve device built into each cover, and a spring-loaded spring is mounted in the piston rod of the cylinder pusher 2, hydraulic actuator according to claim. I, characterized in that the valve device is designed as a spring-loaded ball valve, podklapanna cavity which communicates with the grooved piston cylinder cavity and through drosselyrukschey protochki- the backbone.