SU1574744A1 - Hoisting-carrying machine boom equipment hydraulic drive - Google Patents

Abstract

The invention relates to the field of earthmoving machinery and improves the reliability of the hydraulic actuator of the boom equipment of a small-sized hoisting machine. The hydraulic drive contains a pump, a hydraulic distributor and a hydraulic cylinder (HZ) for raising and lowering the boom. The hydraulics for pumping down the boom is connected to the working cavities of the HZ and with the drain. The hydraulic unit has a housing 8, a bypass system and a control element. The housing 8 is provided with perpendicularly arranged and intersecting channels. The bypass system is made of check valves (OK), which are installed in the first of the channels, directed towards each other and are located symmetrically with respect to the second channel. The control element is designed as a spring-loaded rod 13 installed in the second channel with a pushing head 15. Cone groove 16 of the rod 13 is kinematically connected to the locking elements 9 and 10 OK by means of balls 17 and 18. OK is communicated to the working cavities HZ. The second channel is communicated with the drain. When you press the head 15 with a hydroorgan, the rod 13 with a conical groove 16 acts on the balls 17 and 18. They, in turn, act on the elements 9 and 10, opening OK. Hydrolines are connected to a hydroline drain. There is a pumpless lowering boom. 2 Il.

Description

FIG. one

The element is made in the form of a spring-loaded rod 13 installed in the second channel with a pressure head 15. The conical groove 16 of the rod 13 is kinematically connected to the locking elements 9 and 10 OK by means of balls 17 and 18, OK communicated with working cavities HZ. The second channel is communicated with

When you press the head with a hydroorgan 15, the rod 13 with a conical groove 16 acts on the balls 17 and 18. They, in turn, act on the elements 9 and 10, opening OK. The hydraulic lines are connected to the drain hydroline. There is a pumpless lowering boom. 2 Il.

The invention relates to earthmoving and transport export raspberries, namely to hydraulic drives of small machines.

The purpose of the invention is to simplify and improve the reliability of the hydraulic drive when using it on a small-sized car.

FIG. 1 shows the principle hydraulic circuit of the boom equipment; in fig. 2 — hydro-organ for pump-less lowering of the boom.

The hydraulic actuator includes a pump 1, a hydraulic distributor 2 with a drain hydraulic line 3 and hydraulic lines 4 and 5 boom hydraulic cylinders 6 and a hydraulic unit 7 for pumpless lowering of the boom.

The hydraulic unit for pumping down the boom is provided with a housing 8 with channels perpendicularly arranged and intersecting among themselves, in the first channel there are check valves with seats for spring-loaded locking elements 9 and 10 directed opposite to each other, and cavities 11 and 12 of the check valves are connected to the hydraulic lines 4 and 5 hydraulic cylinders 6 boom.

In the second channel there is a rod 13 with a spring 14, with a pressure head 15 and a conical groove 16 located in the intersection zone of the channels; in which balls 17 and 18 are installed, kinematically interacting with shut-off elements 9 and 10 check valves.

The hydraulic drive is operated by pressing the pressure head 15 of the hydroorgan 7 to pump the boom without pump down. The rod 13 is tapered by a groove 16 acting on the balls 17

and 18, which in turn act on the spring-loaded locking elements 9 and 10 of the check valve, opening them. Hydrolines 4 and 5 are connected to drain hydroline 3 and thus the pumping equipment is pumped down.

Claims (1)

Invention Formula five 0 five 0 five 0 A hydraulic boom equipment of a hoisting machine, including a pump, a hydraulic distributor, a boom raising and lowering hydraulic cylinder, and a hydraulic unit for pumpless lowering of the boom, connected to the working cavities of the hydraulic cylinder and with a drain, has a body, an overflow system and a control element, in order to simplify and increase the reliability of the hydraulic drive when using it on a small-sized machine, the body of the hydraulic unit for pumping without lowering the boom is made with perpendicular and intersecting channels, the bypass system consists of check valves installed in the first of the channels directed towards each other and located symmetrically with respect to the second channel of the housing, and the control element is designed as a spring-loaded rod installed in the second channel with a pressure head and a tapered groove, kinematically with valves, valves are communicated with the working cavities of the hydraulic cylinder, and the second channel - with a drain. 12 Yu 18 f eight FIG. 2