SU1498980A1 - Hydraulic circuit for inclining hoisting device of electric lift truck - Google Patents

Abstract

The invention can be used in hoisting machines. The purpose of the invention is to ensure the stable operation of the hydraulic circuit of the electric forklift. The working cavity of the lift hydraulic motor is connected via parallel-installed non-return valve, throttle and first reversing distributor (PP) with power supply 5 and drain hydroline 6. In the communication line of one cavity of the hydraulic inclination motor (HD) 1 with the second PP 4 there is a controlled non-return valve 7 The cavity 8 of the control valve 7 is connected via the throttle 13 of the other cavity DG 1. Line 2 of the PP 4 connection with the DG 1 communicates with each other via the throttles 9, 10 made adjustable. The chokes 9, 10 are installed in parallel. Line 2 is installed check valves 11, 12. 2 C.p. f-ly, 2 ill.

Description

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The invention relates to general engineering and can be used in hoisting machines.

A hydraulic tilting system for a lift installation of an electric lift truck is known, comprising a lifting hydraulic motor, whose working cavity is connected via parallel installed back valve and a throttle, and the first distributor with a power source and drain hydroline, the hydraulic engine of a slope of the cavity of which is connected through a second reversible distributor to a power source and drain hydroline, and in the communication line of one of the cavities of the hydraulic engine of inclination with a reversible valve installed controlled reverse The valve, check valves and chokes (auth. binding. № 557052, cl. B 66 F 9/22, 1975).

A disadvantage of the known hydraulic scheme for tilting the lift installation of an electric forklift truck is the large hydraulic losses in successively installed thrusters, as a result of which the stable operation of the tilt hydraulic motor is not ensured.

The purpose of the invention is to ensure sustainable operation.

This goal is achieved by the fact that in a hydraulic circuit of inclination of a lift installation of an electric loader containing a controlled check valve, the control cavity of which is connected through one of the throttles to the second cavity of the inclining hydraulic motor, the communication line of the second reversing distributor with the hydraulic inclination motor communicates with each other through two other throttle, made adjustable.

FIG. Figure 1 shows a hydraulic tilting scheme for a lift installation of an electric lift truck for the first embodiment; in fig. 2 is the same for the second embodiment.

The hydraulic tilting scheme of the lift unit of the electric lift truck comprises a tilt hydraulic motor 1 connected to a pressure source 5 and a tank 6 via a valve 4, a controlled check valve 7 installed in a connection 2 of the hydraulic engine 1 tilting with a valve 4, the control cavity 8 of which is connected to line 3 through choke 13, chokes 9, 10.

The hydraulic tilting scheme of the lift installation of an electric forklift (FIG. 2) further comprises check valves 12 and 11.

The hydraulic tilting scheme of the lift installation of the electric forklift (Fig. 1) works as follows.

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When the distributor 4 is turned on at position 1 (Fig. I), the corresponding cavities of the tilt hydraulic motor 1 are connected to the pressure source 5 and to the drain 6 via a hydraulically controlled check valve 7, if the pressure in the control cavity 8 of the latter is enough to open it, the tilt speed of the lift installation will be determined by throttles 9 and 10. When the distributor 4 is turned on in position 2 (Fig. 1), the corresponding cavities of the tilt hydraulic motor 1 are connected with pressure source 5 and tank 6. The throttle will determine the speed of the lifting installation eat 10.

The operation of the proposed hydraulic scheme for tilting the lift installation of an electric forklift (Fig. 2) differs from the known one in that the cavities of the tilt hydraulic motor 1 are interconnected and through appropriate choke 9 or 10 and check valve 11 or 12.

Claims (3)

1. Hydraulic tilting scheme of a lift installation of an electric forklift truck containing a hydraulic lift motor whose working cavity is connected through a parallel installed check valve and throttle and the first reversible distributor with a power source and drain hydroline and drain hydroline, and in the communication line of one of the cavities of the tilt hydraulic motor with a reversing distributor is installed controlled a check valve, check valves and throttles, characterized in that in order to provide stable operation, the control cavity check valve controllably connected through one of the throttle to the hydraulic motor of inclination of the second cavity, and, 0, the lines of communication of the second reversing distributor with the tilt hydraulic motor are connected to each other through two other throttle, made adjustable. 2. The circuit according to claim 1, wherein the throttles in the communication line of the second reversing distributor with the hydraulic motor are installed in series, and the communication lines between them are connected to the drainage line. 3. The circuit according to claim 1, characterized in that the throttles in the communication line of the second reversing distributor with a tilt hydraulic motor are installed in parallel, and a check valve is installed in the communication line of each of them with one of the communication lines of the second reversing valve with a hydraulic tilting motor . five 0 №2: