SU998680A1 - Machine hydraulic drive - Google Patents

Description

(54) HYDRAULIC MACHINE

one

The invention relates to mechanical engineering and can be used, for example, in earth moving machines.

Known hydraulic machine, containing hydraulic pumps, at least two actuators, hydraulic cylinders, hydraulic valves, check and safety valves, pressure, drain lines and hydraulic tank 1.

The disadvantage of this drive is that to ensure the normal functioning of each actuator, the installation of its own autonomous pump is required, and this increases the dimensions of the hydraulic drive, the pump reducer and the machine as a whole, complicates and increases the cost of the drive.

Closest to the invention to the technical essence is a flow divider, each outlet of which is connected to an actuator through a check valve and a distributor, and the hydraulic line 2.

A disadvantage of the known drive is the impossibility of alternate operation of the executive bodies both at one and several speeds, as well as the lack of stability in different operating modes.

The purpose of the invention is to ensure stable operation of the executive bodies in the joint and separate modes of operation.

This goal is achieved by the fact that the hydraulic actuator of the machine, including the pump, the flow divider, each outlet of which is connected to the executive body through the check valve and distributor, and the hydraulic lines, each output of the flow divider is equipped with a safety valve with two control chambers and an additional

10, and the safety valve control chambers, respectively, are connected to the output of the divider and the additional distributor, the outputs of the safety valve and the additional 15 distributor are connected to a drain, and each output of the flow divider is connected to the pump through an additional distributor.

The drawing shows a diagram of the proposed hydraulic drive.

20

The hydraulic drive of the machine contains a pump 1, the executive bodies are a hydraulic motor 2 and a hydraulic cylinder 3, a divider 4 of the working fluid flow, a discharge line 5, connecting the outlet of the pump 1 and the input of the divider 4,

lines 6 and 7 connecting the outputs of the divider 4 through the check valves 8 and 9, valves 10 and I with the hydraulic motor 2 and the hydraulic cylinder 3. The drain lines 12 and 13 connect the outputs of the valves 10 and II to the hydraulic tank 14.

Highways B and 7 are connected to a hydraulic tank through safety valves 15 and 16 with additional distributors 17 and 18. The outlets of pump 1 and flow divider 4 are connected by lines, in which additional distributors 19 and 20 are installed. Safety valves 15 and 16 are connected to a drain by hydraulic lines 21 and 22.

The hydraulic actuator works as follows ..,

If it is necessary to work the actuators - the hydraulic motor 2 and the hydraulic cylinder 3, install the valves 10 and 11 to the required extreme positions, and turn on the pump 1. The working fluid from the tank 14 is sent to the flow divider 4, which divides the flow into two parts, one of which through line 6, through the check valve 8 and the distributor 10 enters the hydraulic motor 2, and the second through line 7, through the check valve 9 and the distributor 11 - into the hydraulic cylinder 3, the actuator specified actuators, bodies in action. When the set pressure limit is exceeded, safety valves 15 and 16 are triggered, the working fluid is by-passed through line 21 and 22 to tank 14. The flow divider 4 ensures the joint operation of the executive bodies 2 and 3, regardless of the change in load on any of them.

If necessary, the alternating work of the executive bodies with a speed equal to their speed when working together, for example, working only the hydraulic cylinder 3, switch the distributor 17 to the right position according to the scheme. In this case, the safety valve 15 is unloaded and the line 6 is connected to the tank. The flow of the working fluid is divided by the divider 4 in a predetermined ratio. One part of the flow through the line 7 through the check valve 9 and the valve 11 enters the cylinder 3. The other part of the flow through the line 6 comes through the unloaded safety valve 15 and the line 21 to the drain. To obtain a second speed of movement of the hydraulic cylinder, the valve 20 is switched to the upper position according to the scheme, and

distributor 17 - to the left in the scheme position. All the working fluid coming from the pump, the divider 4 flows through the distributor 20, the check valve 9 and the distributor 11 to the hydraulic cylinder 3. And both in the first and in the second

In this case, the speed of the executive body does not depend on the load. Similarly, get two speeds when running only the motor 2.

Thus, thanks to the proposed technical solution, regardless of

load, the possibility of joint work of the executive bodies, as well as the alternate work of the executive bodies at different speeds.

Claims (2)

1. A hydraulic actuator of the mashina, including a pump, a flow divider, each outlet of which is connected to the executive body through a check valve and distributor, and The main line, characterized in that, in order to ensure stable operation of the executive bodies, in joint and separate operating modes, each output of the flow divider is equipped with a safety valve with two control chambers and an additional distributor, and the safety valve control chambers are respectively connected with the divider output and additional a valve, while the outlets of the safety valve and the additional valve are connected to the drain. , 2. A hydraulic actuator according to claim 1, characterized in that each output of the flow divider is connected to the pump by means of an additional distributor. Sources of information taken into account in the examination 1. USSR author's certificate number 171813, cl. E 02 F 9/22, 1963. 2.Bogdanovich L.V. Volumetric hydraulic actuators, “Technique, Kiev, 1971, p. 117, fig. 70 5 (prototype).