CS201131B1 - Facility for increasing the working capacity of hydraulic lifting machines particularly the battery carriages - Google Patents

Description

The invention relates to a device for increasing the working capacity of hydraulic lifting machines, in particular battery-operated trucks.

Currently, a completely non-reversible duty cycle is used on hydraulic truck lifting systems. The cycle is usually as follows;

The truck moves under the pallet to be stored. At the point of storage or on the way to this point, it lifts them up and down, then takes a full pallet, pushes it out of the rack, lowers it to the transport position and moves it to the loading point, lifting is energy-intensive; extruded hydraulic oil to achieve an acceptable descent rate.

It can be said that this is a completely loss-making process, since the pressure energy of the hydraulic oil is only converted into heat. With battery-operated hydraulic lift trucks, this energy loss is high. The dimensions, weight and working capacity for a single battery charge predominantly determine the required lifting power.

The aforementioned drawbacks are eliminated by a device for increasing the working capacity of hydraulic lifting machines, in particular battery trucks, whose hydraulic connection downstream of the distributor consists of a load lift check valve, a load lift check valve and a lowering valve, a pipeline and a hydraulic lifting cylinder. that between the lift cylinder and the trigger valve

201 131

201 131 is a charging generator consisting of a hydraulic motor mechanically connected by a gearbox to an alternator, the inlet and outlet of the hydraulic motor being bridged by a bypass relief valve, the advantage of this arrangement is to use commonly available elements grouped in the charger generator to retrofit on existing hydraulic hoists especially battery carts.

Fig. 1 shows a hydraulic diagram of a lifting device with a charging generator, and Fig. 3 shows a charging generator, a hydraulic oil pump driven by a motor 3, connected to a distributor 5.

The latter is also hydraulically connected to the lift check valve 2 and the lift cylinder 6 via a lifting branch. the trigger line is connected from the lift cylinder 4 via the check valve and the trigger valve of the distributor and filter 4 to the oil tank. In the hydraulic circuit between the lift check valve 2 ^{and the non} -return and start valve 4 towards the lift cylinder 4, a charging generator 10 is inserted, which consists of a hydraulic motor 11 bridged by a bypass relief valve 14. The hydraulic motor 11 is then mechanically coupled via a gear ls with an alternator I3. An overflow valve 6 is provided in front of the distributor 6 between the lifting branch 6 to secure the lifting device against overload.

When lifting the load, the hydraulic oil from the pump 1 flows through the distributor 8 through the check valve for the lift 2, d ° of the lifting cylinder 6. The flow of oil through the charging generator is prevented by a non-return valve upstream of the start valve 6.

When the load is lowered, the non-return valve for lifting the oil back into the tank and thus the load falls and the oil flows through the intermediate charging generator lo, in which the bypass relief valve 14 closes the bypass of the hydraulic motor 11. It spins and drives the I3 alternator via the I3 gearbox. The alternator is self-regulating, so there is no need for an additional electronic device to regulate the charging current.

When the hoist is lowered without a load, the oil flows through the bypass relief valve 14, thereby preventing the motor 11 from spinning and thus charging the battery.

Claims (1)

BACKGROUND OF THE INVENTION A device for increasing the working capacity of hydraulic lifting machines, in particular battery trucks, whose hydraulic connection downstream of the distributor consists of a load lift check valve, a load lower check and start valve and a lifting cylinder, characterized in that between the lifting cylinder (4) and a start-up valve (5) is inserted by a charging generator (lo) consisting of a hydraulic motor (1i) mechanically connected to the gearbox (1s) with the alternator (I3), the inlet and outlet of the hydraulic motor (11i) being bridged by the bypass valve (14).