FI128664B - Hydraulic hose feed system - Google Patents

Abstract

The invention relates to a hydraulic hose feeding system for rotating and controlling a coil (2) and a hose / cable / wire and other feed unit (3). The system has been developed for a drain flushing device, but it can also be used for winches, etc., with a separate storage coil and a winch drum / feeder. In the prior art, problems arise when the feed stops abruptly during a fast feed. The spool (2) then continues to rotate due to the flywheel effect, as a result of which the object (1) to be wound unwinds behind the spool and is in danger of getting caught in other parts of the machine as the feed continues. In the present invention, the braking of the coil (2) operates regardless of whether the supply from the control valve (8) is stopped or whether it stops due to mechanical resistance.

Description

Hydraulic hose supply system The invention relates to a hydraulic system for driving and regulating winding and discharge unit for hose / cable / wire etc. The operation of drainage flushing machines is generally arranged as described in patent GB2037392B. So that during retraction the two hydraulic motors function as connected in parallel, while during discharge the hose reel is braked slightly due to the pressure in the return line from the feed unit motor being higher than the return pressure after the control valve. Patent GB2156643A also describes a hydraulic feed system for irrigation machines, but in that embodiment the hose is only pulled in by the wind hydraulic motor. Which is not expedient in cases where a lot of force is required when retracting the hose. The problem with previously known systems arises when the output is suddenly stopped during fast output. Then the wind continues to rotate due to the flywheel effect with the consequence that the hose / wire is rolled out towards the back and risks getting stuck in other machine parts as the feeding continues. With this invention as described in claim 1, the braking of the wind works independently whether the supply is stopped with the control valve or due to mechanical resistance. An advantageous embodiment of the invention is described below with the aid of a drawing (Figure 1) which contains a hydraulic diagram and a schematic sketch of the N 20 most important mechanical parts needed for the understanding of the invention.

N 3 As in the prior art, the coiled object (1) is stored on a coil (2) and S is discharged by pressing it between one or more pairs of hydraulically driven wheels (3) which E has latches adapted for the hose. The wheels and the motor connected to them are hereinafter referred to as N as the "feed unit".

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S S 25 Nir snakes, i.e. the wound object (1) is retracted, the hydraulic motor (4) is driven on the hose reel as connected in parallel with the feed motor (5). The return flow from the wind's hydraulic motor (4) is led directly to the tank without going through any maneuvering valve. When the winding object (1) is ejected, the winding (2) decelerates slightly due to the return pressure from the feed motor. In this invention, the braking function has been arranged so that the flow to the feed motor (5) in the direction of retraction is led via a double pressure-controlled non-return valve (6).

The double non-return valve (6) is connected so that the pressure from the control valve is led to one control port, from the corresponding operating port via a T-connection to the other operating port, further from the other operating port to the feed motor (5). The flow to the wind motor (4) is taken from the T-coupling between the working ports of the double non-return valve (6). Thereby, the outflow from the wind motor is effectively stopped when the flow ceases to or from the feed motor. The brake therefore works regardless of whether the feed is stopped from the control table or due to increased mechanical resistance. This connection of a double pressure-controlled non-return valve differs from previously known connection diagrams in that the main flow passes directly back to the other side of the valve. Thus, the motor (4) is read only in one direction. To avoid hose bursting, a pressure relief valve (7) can be mounted from the line between the winding and double non-return valve (6) to the tank. The system is designed for flushing units for cover ditches, but can also be used for winches and the like that are based on a separate betrayal wind and winch drum.

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Claims (1)

Patent claims A hydraulic hose supply system comprising a hydraulically driven hose reel (2), a hydraulic motor (4) on the hose reel, a feed unit (3) for the hose (1) with hydraulically driven wheels, a hydraulic motor (5) for the feed unit (3) and a control valve, and in which the system flow from the hydraulic motor (4) on the hose reel has been arranged to stop when there is no flow to or from the hydraulic motor (5) of the feed unit, characterized in that the system also contains a double pressure controlled non-return valve (6), connected so that the hydraulic motor (4) on the hose reel is locked only in one direction by passing the pressure from the control valve to a control port on the double check valve (6), from the corresponding working port via a T-connection to the other working port on the double check valve (6) and further from corresponding control port to the hydraulic motor (5) for the feed unit (3), and the flow to the hydraulic motor (4) on the hose reel is taken from the t-coupling between working ports on the double check valve (6) o N O N o O K O I a a N O O K © O N