FR2572201A1 - Electrical remote control - Google Patents

Abstract

The invention relates to accessories of the remote control type enabling a part or set of parts to be moved or positioned without having to touch them. It comprises a jack 1 of composite and non-oxidisable materials which is associated with a windscreen washer type electric pump 10 integral with the jack. The hydraulic circuit is of the closed type and comprises a position-locking electrovalve 13 actuated simultaneously with the motor and enabling the stem of the jack to be moved uniformly. Among the most beneficial applications of the invention can be cited the remote control of shutters, and deflectors. This device can perfectly well be adapted to industrial automation problems.

Description

 Electric remote control.

 The present invention relates to remote control accessories for moving and positioning parts and mechanical assemblies at will.

 in known devices of this kind, the movement or the position of the parts and assemblies is obtained manually by means of levers and cables. Such devices are difficult to use and are subject to deterioration, and therefore imprecise. Other hydraulic or pneumatic devices are also known which use a jack supplied by a source of hydraulic or pneumatic energy through a manual or electric distributor. These devices are precise and reliable but require an imposing implementation of highly technical and very expensive components. I1 also exist electro-mechanical devices commonly called electric cylinders comprising a gear motor associated with a ball nut and worm screw system.

These latter devices make it possible to obtain alternative movements but require the use of a safety clutch or limit switches with an electrical contactor, which increases the cost price.

The electrical remote control according to the invention makes it possible to avoid these drawbacks. Here, in fact, we obtain a regular translational movement allowing a precise position display requiring neither clutch nor limit switches
The translation is obtained by means of a low pressure hydraulic cylinder consisting of a chromed steel or stainless steel rod fitted with a piston and a composite tube. The regular displacement of the rod is achieved by means of a constant flow. This flow is emitted at constant pressure by electrical means.

 According to a first variant, this means is a vane pump driven by a direct current electric motor whose direction of rotation is reversible.

 According to a second variant, this means is a piston pump actuated by an electromagnet.

 According to a third variant. this means is a menbrane whose deformations are ensured by means of an electric motor or an electromagnet.

 The three pumps listed above are said to be low pressure and particularly manufactured in very large series since they are used as windshield washer pump in the automotive industry.

 The cylinder rod output position display is obtained by means of a normally closed solenoid valve. This being connected in series with the motor only opens when the motor is energized. It thus seals the circuit at rest and the cylinder can therefore be locked in all positions and under load.

 The complete opening and closing positions of the cylinder are allowed without damage while keeping the pump energized. The piston of the jack is indeed equipped with two opposite valves calibrated at the nominal pressure admitted by the pump.

 The device according to the invention therefore makes it possible, by acting on a switch, to control at will the movement of a part, set of parts without having to touch them and in complete safety.

As shown, the device includes
A jack (1) whose body is entirely made of composite materials, equipped with a stainless rod (2). This rod is integral with a piston (3) equipped with valves (4) and (5) ensuring the protection of the assembly. The cylinder is connected via the power supplies (6) and (7) to the suction (8) and discharge (9) orifices of the pump (10) driven by an electric motor (ll) fixed on the cylinder ( 1) by means of a square (12). A solenoid valve (13) isolates the two chambers of the cylinder. The electric motor and the solenoid valve are energized by means of a manual, automatic or remote-controlled switch (14).

When the motor (11) and the solenoid valve (13) are energized by means of the switch (14) the solenoid valve opens and simultaneously the motor (11) actuates the pump (10) in such a way
-: t the suction is carried out by the orifice (8) and the discharge by the orifice (9) the differential chamber of the jack constitutes the reservoir the circulation of the liquid takes place in the direction (6) towards (8 ) and (9) to (7). The piston (3) moves and the rod (2) comes out. As soon as the switch is stopped, the motor and the pump stop, the solenoid valve closes, the rod (2) is locked in translation even under load. By reversing the polarity of the electrical circuit by l With the switch, the motor and the pump start to reverse: circulation is carried out from (7) to (9) and (8) to (6), the solenoid valve being opened again. As soon as you stop actuating the switch, the cylinder rod is locked again,
When the piston (3) comes to an end-of-travel stop, one or other of the valves (4) and (5) allows excess pressure to pass from one chamber to the other. The pump continues to flow in a closed circuit without damaging the pump components or those of the cylinder.

 According to another embodiment of the device. the solenoid valve (13) is mounted in such a way as to produce the circulation or non-circulation of the liquid directly between the orifices (6) and (7) When the energizations of the motor and of the solenoid valve are separated, the rod retraction operation under load can be done without supplying the pump unit and therefore with lower energy consumption.

This arrangement is particularly recommended for obtaining a so-called "single effect" cycle.

 The device, object of the invention can be used in all cases of remote control, adjustment of positioning, movement of parts and set of parts and particularly on any fixed or mobile installation powered by a source of continuous electrical energy. as well as for automatic control of hatches, shutters, etc. Particularly interesting applications can be: the control of drawers for hydraulic distributors and ventilation shutters as well as deflectors on mobile machinery for agricultural and public works. There are also many applications in the automotive industry * window controls, door opening. coffers. locking. unlocking.

clutch. This device allows many applications in automation -

Claims (5)

CLAIMS 1 - Remote electrical control using a continuous or alternative electrical source, and a liquid characterized in that it includes a means of pressurizing at constant flow. 2 - Electric remote control according to claim 1 characterized  by the fact that this pressurizing means is a pump  windshield washer type vanes 3 - Electric remote control according to claim 1 characterized  by the fact that the liquid is enclosed in the two chambers of a  double-acting low pressure cylinder with compensated differential volume. 4 - Electric remote control according to claim 1 characterized  by the fact that the pressurizing means is a pump  piston actuated by an electromagnet of the windshield washer type. 5 - Electric remote control according to claim 1 characterized  by the fact that the pressurizing means is a pump  windshield washer type electric membrane. 6 - Device according to claim 3 characterized in that  the cylinder piston has two pre-set safety valves  at nominal pump pressure. 7 - Device according to claims 1 2 3 4 5 characterized by  whether the hydraulic system tank is either  chambers of the cylinder 8 - Device according to claims 1 2 3 4 5 characterized by the  fact that the locking in position is obtained by electrical means.