Channel of opposite flows of multiflow hydraulic actuator

FIELD: machine building.

SUBSTANCE: invention refers to machine-building hydraulics, and namely to hydraulic actuators of mobile machines and hydraulic plants of cyclic action with several actuating mechanisms. The invention proposes a channel of multiflow hydraulic actuator, which is intended for supply of a working liquid flow to pressure cavities and consists of several in-series connected double flow cavities having the possibility of disconnecting their inlets and outlets. Besides, on the flow inlet side, each double flow cavity is connected to the corresponding pressure cavity. Besides, in ties between pressure and overflow cavities there additionally installed are check valves directed with their outlets to pressure cavities. And outlets of double flow cavities are connected through inlets of check valves to the corresponding pressure cavities. Besides, the outlet of the last double flow cavity serves as an inlet for the other flow.

EFFECT: proposed invention allows supplying two independent flows via one hydraulic channel with several pressure cavities, as well as simplifying a hydraulic actuator and reducing dimensions of hydraulic equipment.

2 cl, 8 dwg


The invention relates to oil hydraulics, in particular for mobile hydraulic machines and hydraulic installations cyclic actions with multiple actuators.

Known hydraulic actuators excavators, cranes and manipulators in which the channels supplying the working fluid from the pressure line, are connected with the multiple pressure cavities, which are powered using hydraulic actuators at their inclusion. Depending on the functions inherent in the hydraulic actuator, these channels can be performed on various options.

When required the simultaneous supply of fluid to the several actuators, the channel is so that he combined pressure cavity corresponding to these mechanisms, the parallel scheme (Risa, [1]). This version of a channel characteristic for valves of the type MO Bosch Rexroth AG, it provides a parallel connection circuit spools to the head [2].

The disadvantage of this variant channel, the inlet flow is that it does not allow combining two or more workers movements regulate their speed, as the fluid tends to flow into the hydraulic motor of the working body with the least external resistance.

When you want to exclude completion of the second fluid input to more than one mechanism, used another variant of the channel. This channel is formed of several series connected dual-flow cavities communicating with each other.

This variant channel provides individual wiring actuators. Moreover, the priority of the connection head, in case of simultaneous activation of several mechanisms, the mechanism of the pressure cavity which is supplied from the flow cavity located closest to the beginning of the channel. The working fluid will be supplied to the corresponding pressure cavity. When this actuator passage between the cavities dual flow cavity will be closed, therefore, the supply of working fluid to the mechanisms, powered from the following dual flow cavities will not (Resv, [1]).

This variant of the inlet flow channel, providing individual wiring actuators to the head, is the closest analogue of the proposed technical solution and adopted for the prototype.

This invention solves the following tasks:

(a) flow through a single channel of two independent flows into the discharge cavity corresponding to any of the valve;

b) flow through a single channel of two independent from each other in separate threads of the pressure cavity of the two, the priority is to maintain spools enabling multiple spools.

C) simplify the design of hydraulic machines.

This technical result is achieved by the fact that one of the inlet channel with different end serves two independent flow directed towards each other. To ensure the function of adding threads when one of the actuator, as well as to ensure simultaneous operation of actuators each of its flow, all flow cavity of such a channel connected through the input non-return valves with the corresponding pressure cavities.

Figure 1 illustrates the case of a channel that is identical to the one adopted for the prototype. Figure 2 shows the channel counter-flows, which is the subject of this invention. On both figures shows the channels in which the flow cavity is locked by means of a cylindrical spool, and, on these figures and the following shows the cavity, which form the channel of the counter flow. Other cavities that are not related to the channel counter currents, conventionally not shown. Figure 3 shows a diagram of a hydraulic channel counter currents. Figure 4 arrows show the direction of flow by locking the second from the bottom of the flow cavity. Figure 5 is the same as for locking the first and third flow cavity. Figure 6 shows a variant of the channel counter-flows with divisive element, made in the IDA controlled valve and the direction of flow upon closing the second flow cavity. 7 - direction of traffic flow for locking the first and third flow cavities channel counter flow valve divisive element. On Fig shows a simplified diagram of the hydraulic drive with individual wiring mechanisms to two independent streams using a single channel counter currents. For clarity, the elements of the channel counter-flows on Fig shows thickened lines.

The channel counter streams includes a pressure cavity 1-4, dual flow cavity 5-8, with inputs 9-12 and outputs 13-16, check valves 17-24, entry 25 for the second thread. Inputs 9-12 and outputs 13-16 are connected through check valves 17-24 with pressure cavities 1-4.

In case the channel counter of threads according to claim 2, all these elements are in the housing 26 threaded hydraulic valve (figure 2, 6).

The channel counter flow works as follows. In the neutral position all dual flow cavity 5-8 not locked, the channel is open along the entire length of the entrance 9 to the second input 25 (figure 2, 3, 8), the pressure in the channel is minimum, check valves 17-24 closed, the pressure cavity 1-4 disconnected from the Executive mechanisms.

When enabled, only one actuator is overlapping channel counter-flows, for example, in a double-flow cavity 6. The input 10 and the output 14 is the cavity are separated. Thread P1 from the input 9, bypassing the open double flow cavity 5 through the check valve 19 is directed into the discharge cavity 2. The second stream P2 from the entrance 25, bypassing the open double flow cavity 8 and 7 through the check valve 20, is directed also to the pressure cavity 2. As a result, to the actuator is routed to the total flow of the two streams, which allows to increase the maximum possible speed that the actuator (4, 6).

If you try to connect a few more actuators, for example, in addition to block double the flow cavity 5 and 7 (figure 5, 7), the discharge flow P1 from the input 9 through the check valve 17 will be directed into the discharge cavity 1, and from there to appropriate it to the Executive mechanism. The flow passage P1 to the pressure cavity 6, block double locked the flow cavity 5, which is located closer to the input 9 of the flow P1.

The second discharge flow P2 will go from the entrance 25, bypassing the open flow-through chamber 8 through the check valve 22, pressure in the cavity 3, and then to the appropriate it to the Executive mechanism. The flow passage P2 to the pressure cavity 2 will overlap the double locked the flow cavity 7, which is located close to the inlet 25 of flow P2. As a result, movement of the actuator corresponding to the pressure cavity 2 will become impossible.

Fulfill the capacity mechanism, the corresponding pressure cavity 1 is connected to the pressure P1, and the actuator corresponding to the pressure cavity 3, is connected to the pressure P2. Thus, to be implemented independent simultaneous operation of two Executive bodies, have priority over previously included Executive body.

1. Channel multi-threaded hydraulic actuator, intended for the supply of the working fluid flow to the pressure cavities, consisting of several series connected dual-flow cavities, having the opportunity to divide their inputs and outputs, and from the input stream each dual flow cavity is associated with the pressure cavity, characterized in that the relationship between pressure and overflow cavities are installed check valves, aimed their outputs to the pressure cavities, and outputs dual flow cavities are connected through the input non-return valves with the respective pressure chambers and the release of the latest dual flow cavity serves as input for another thread.

2. Channel according to claim 1, characterized in that it is made in the case of multithreaded hydraulic distributor.


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