RU194517U1 - DISTRIBUTION UNIT FOR HYDRAULIC DRIVE - Google Patents

Abstract

Block distributing hydraulic drive of a snow removal blade, including a hydraulic distributor that connects, in accordance with control signals, the working cavities of a double-acting hydraulic cylinder with a pressure and drain hydraulic lines, a hydraulic plate with a drain and pressure hydraulic lines and working channels connected to the working cavities of a double-acting hydraulic cylinder, a pressure reducing valve with an electric control , and configured to connect one working channel of the hydraulic plate to the hydraulic circuit of the hydraulic plate through a series-connected pressure-reducing valve with electric control and a control valve, and the other working channel - by means of a hydraulic control valve with a hydraulic control line discharge pipe.

Description

Technical field

The claimed utility model relates to devices for removing snow or ice from roads and runways.

State of the art

Dumps for removing snow or ice from roads or pavements and hydraulic drives of such dumps with distribution blocks, including hydraulic drives regulating the height of the dumps and the pressure of the dumps on the surface to be cleaned, are widely known.

The prior art disclosed in the USSR author's certificate No. 1049610 of 10.23.1983 a distribution block of a hydraulic drive of a snow removal blade, including a control valve that connects, in accordance with control signals, the working cavities of a double-acting hydraulic cylinder with a pressure and drain hydraulic lines.

The disadvantage of this known hydraulic actuator is that the hydraulic actuator provides for the joint connection of a hydraulic cylinder and a hydraulic motor to the hydraulic pump, which prevents the use of pressure and drain hydraulic lines with other attachments mounted on a self-propelled chassis together with a snow blade.

The prior art also disclosed in German patent application DE19541190 of 05/07/1997, a distribution block of a hydraulic drive of a snow removal blade, including a hydraulic distributor. connecting, in accordance with control signals, the working cavities of a double-acting hydraulic cylinder with pressure and drain hydraulic lines. This well-known technical solution is selected as the closest analogue of the claimed utility model.

The disadvantage of this known hydraulic actuator is the use of a hydraulic pump to regulate the pressure in the hydraulic cylinder, which also prevents the use of pressure and drain hydraulic lines with other attachments mounted on a self-propelled chassis along with a snow blade.

The claimed technical solution is aimed at eliminating these shortcomings of the known technical solutions.

Utility Model Disclosure

The technical result achieved by using the claimed utility model is that the pressure is not regulated in the entire system, but only in the lift line of the blade, the pressure at the outlet of the hydraulic pump remains constant, and, accordingly, during dumping, the pressure of the blade is reduced on the surface to be cleaned independent use of the hydraulic pump, pressure and drain hydraulic lines is provided with other attachments installed on the same self-propelled chassis, for example, side dump, sweeping brushes, ra brasyvatelem reagent.

The indicated technical results are achieved in the distribution block of the hydraulic drive of the snow blade, including:

- a control valve that connects, in accordance with control signals, the working cavities of a double-acting hydraulic cylinder with a pressure and drain hydraulic lines,

- a hydraulic plate with a drain and pressure hydraulic lines and working channels connected to the working cavities of a double-acting hydraulic cylinder,

- an electrically controlled pressure reducing valve to reduce the pressure of the snow blade on the surface to be cleaned and transfer it to the transport position, and

made with the possibility of connecting one working channel of the hydraulic plate (for example, connected to the piston cavity of the hydraulic cylinder) with the pressure line of the hydraulic plate by means of electrically controlled pressure reducing valves and the valve, and another working channel (for example, connected to the rod cavity of the hydraulic cylinder) by means of drain hydraulic line of the hydraulic plate.

The unit may additionally include an electrically controlled non-return valve, and can be configured to connect the working channel of the hydraulic plate to the pressure hydraulic line by means of series-connected two-position pressure-reducing valves with electric control, a directional control valve and an electrically controlled check valve to reduce the pressure of the snow blade on the surface being cleaned, and for holding the snow blade in a raised (transport) position with the possibility of blocking working channel ki compound gidroplity gidromagistralyu the pressure check valve electrically controlled off from the pressure relief valve gidromagistrali gidroplity compound and the reducing valve with drain gidromagistralyu gidroplity.

The non-return valve can be installed on a hydraulic plate mounted on a self-propelled chassis, the pressure relief valve can be installed on a non-return valve, and the control valve can be installed on a pressure relief valve.

Brief Description of the Drawings

In FIG. 1 shows the claimed block distribution hydraulic drive snow blade.

In FIG. 2 shows a hydraulic circuit of a hydraulic distribution block holding a snow blade in a transport position.

In FIG. 3 shows a hydraulic circuit of the distribution block of a hydraulic actuator providing a "floating" mode of a snow removal blade.

In FIG. 4 shows a hydraulic circuit of the hydraulic drive distribution block, providing a reduction in the pressure of the snow blade on the surface to be cleaned or transfer of the snow blade to the transport position.

In FIG. 5 shows a hydraulic circuit of a distribution block of a hydraulic actuator providing for forced lowering of a snow blade.

Utility Model Implementation

Shown in FIG. 1 block distribution hydraulic drive snow blade includes:

a hydraulic plate 1 made with pressure channels 2 and drain 3 of hydraulic lines and two working channels 4 and 5 connected to the working cavities of a double-acting hydraulic cylinder;

check valve 6 with electric control mounted on a hydraulic plate 1;

an electrically controlled pressure reducing valve 7 mounted on the check valve 6;

a control valve 8 mounted on the pressure reducing valve 7; and

safety valve 9, designed to prevent overpressure in the block.

As shown in the hydraulic circuits, see figures 2-5, the check valve 6 and the pressure reducing valve 7 are made two-position, and the valve 8 is made three-position.

In FIG. 2 shows the connection of the hydraulic drive elements while holding the snow blade in the raised (transport) position and the hydraulic cylinder rod is in the raised position. The working channels 4 and 5 of the hydraulic plate 1 are connected, respectively, with the piston and rod cavities of the hydraulic cylinder 10. Moreover, the rod cavity of the hydraulic cylinder 10 is connected by a valve 8 to the drain hydraulic line 3 of the hydraulic plate 1. The outlet from the piston cavity of the hydraulic cylinder 10 is blocked by a deenergized closed check valve 6, which provides fixing snow plow in the raised position.

In FIG. 3 shows the connection of the hydraulic drive elements when the snow blade is in the "floating" mode, which allows the snow blade to go around obstacles on the road to be cleaned. In this mode, the rod and piston cavities of the hydraulic cylinder 10 are connected to the drain hydraulic line 3 of the hydraulic plate 1. Moreover, the rod cavity of the hydraulic cylinder 9 is connected to the drain hydraulic valve 8 and the drain hydraulic line 3 of the hydraulic plate 1. And the piston cavity of the hydraulic cylinder 10 is connected to the drain hydraulic line 3 through the hydraulic valve 3 to which a control signal is supplied, and a de-energized directional control valve 8.

When the snow blade is lowered up to 7 meters long and weighs up to 3,000 kilograms, the road surface is violated, which is critical for runways. To solve this problem in the working cavity of the hydraulic cylinder 10, it is necessary to create some pressure, insufficient to lift the snow blade, but providing a redistribution of the load between the hydraulic cylinder and the road surface. This reduces the pressure of the snow blade on the surface to be cleaned. To ensure this mode, a pressure reducing valve 7 is used with electric control that regulates the pressure in the lifting working cavity of the hydraulic cylinder from 10% to 100% of the pressure required to lift the snow blade. In FIG. 4 shows the connection of the hydraulic drive elements when the snow blade is in the mode of reducing pressure on the surface being cleaned. In this mode, the rod cavity of the hydraulic cylinder 10 is also connected by the hydraulic distributor 8 to the hydraulic discharge pipe 3 of the hydraulic plate 1. And the piston cavity of the hydraulic cylinder 10 is connected to the pressure hydraulic pipe 2 of the hydraulic plate 1 through a pressure reducing valve 7, the hydraulic valve 8 and the open check valve 6.

To dismantle the snow blade from the chassis, in particular up to 7 meters in size and weighing up to 3,000 kilograms, it is necessary to unload the front axle of the chassis. In FIG. 5 shows the connection of the hydraulic drive elements for the forced lowering of the snow blade. In this mode, control signals are supplied to the control valve 8. pressure reducing valve 7 and check valve 6. The rod cavity of the hydraulic cylinder 10 is connected to the pressure hydraulic line 2 of the hydraulic plate 1 through the pressure reducing valve 7 and the control valve 8. And the piston cavity of the hydraulic cylinder 10 is connected to the hydraulic discharge pipe 3 of the hydraulic plate 1 through open check valve 6 and directional control valve 8.

Claims (3)

1. The distribution block of the hydraulic drive of a snow removal blade, comprising a hydraulic distributor that connects, in accordance with control signals, the working cavities of a double-acting hydraulic cylinder with a pressure and drain hydraulic lines, characterized in that it further includes a hydraulic plate with a drain and pressure hydraulic lines and working channels connected to the working cavities of the hydraulic cylinder double-acting, electrically controlled pressure reducing valve to reduce snow pressure of the dump on the surface to be cleaned, and is configured to connect one working channel of the hydraulic plate to the pressure head of the hydraulic plate through the electrically controlled pressure reducing valve and the control valve, and the other working channel, by means of the control valve, to the drain hydraulic line of the hydraulic plate. 2. The unit according to claim 1, characterized in that it further includes an electrically controlled non-return valve and is configured to connect the working channel of the hydraulic plate to the pressure hydraulic line by means of a series-connected two-position pressure-reducing valve with electric control, a directional control valve and an electrically controlled non-return valve, and for holding the snow blade in the raised position - with the possibility of blocking the connection of the working channel of the hydraulic plate with the pressure hydraulic line o Ratnam valve electrically controlled off from the pressure relief valve gidromagistrali gidroplity compound and the reducing valve with drain gidromagistralyu gidroplity. 3. The unit according to claim 2, characterized in that the non-return valve is mounted on a hydroplate mounted on a self-propelled chassis, the pressure relief valve is mounted on a non-return valve, and the control valve is mounted on a pressure reducing valve.

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