FR2591026A1 - Motorised operating unit with remote control for power switch - Google Patents

Abstract

Motorised operating unit with remote control for power switch. Motorised operating unit characterised in that it comprises in association a motor reduction gear unit 11, a control shaft 10 with two actuating connecting rods 4 and 5 and a mechanism 16 for locking the manual control, associated with a device 18 for barring the said manual control in combination with one or more electrical safety measures. This invention is of interest to constructors of hardware for switching under high power, in particular for electrical distribution.

Description

 The present invention relates to a remote-controlled motorized operating assembly for a power switch.

 Power switches are frequently used in the power supply circuits of specialized units operating continuously in hospitals, computer rooms, but also in many manufacturing units and offices equipped with an emergency unit.

 In fact, these switches make it possible to connect the electrical installation to an internal emergency power supply intended to avoid a stop in operation due to a network failure.

 For reasons of automation, speed and convenience, consideration has been given to motorizing the control of these switches. This motorization makes it possible to control them remotely by manual action, but above all by varying an electrical quantity, for example, a voltage fault detection signal.

 To ensure abrupt switching on and off, the mechanism actuating the movement of the contacts includes springs with high stiffness. Thus, the force required to move the contacts turns out to be significant, making the direct manual operation somewhat "athletic".

 Therefore, the electric drive motor must necessarily have a large torque. However, if the speed of maneuver is thus ensured, provision should be made for suitable braking.

In addition, the manual control must remain and to do this, only the uncoupling with
the mechanical plug of the electric motor can bring
the possibility of maneuvering due to the almost irreversible nature of the mechanical drive. In addition, in order to avoid false operations and for legal obligations, the manual and electrical control must be equipped with locking and locking devices associated with a padlock.

 The difficulty concerning braking and stopping at the end of the race has already been resolved by a friction movement transmission device. The motor in contact with the end stop is braked in this case by two friction discs which absorb the braking energy, thus preventing damage to the stops.

 These friction discs unfortunately only have a low efficiency, which cannot completely eliminate mechanical shocks against the stops.

 Furthermore, there remain of course the conventional faults inherent in friction devices such as wear, a source of play, and heating, a source of deformation and a more difficult manual operation.

 The present invention aims to remedy these main drawbacks by proposing a motorized operating assembly for a power switch which has several safeguards against operating errors, and sufficient electrical and mechanical reliability.

 To this end, the invention relates to a motorized operating assembly for a power switch characterized in that it consists of a geared motor group engaged on a shaft by a bevel gear, said shaft actuating the switch control rods, in combination with a device for uncoupling the mechanical socket and a locking mechanism connected to a locking plate for the manual control.

The present invention provides numerous advantages, the main ones of which will be mentioned below.
total guarantee of proper functioning by
mechanical and electrical locks,
. condemnation of manual and electrical operation
by padlocking, easy to maneuver manually by safe disengaging
and easy of the gear motor assembly thanks to its
conical torque transmission,
electrical and mechanical braking of the engine,
robustness and reliability.

The technical characteristics of the invention and other advantages are set out in the description which follows, carried out by way of non-limiting example on an embodiment with reference to the appended drawing in which. Figure 1 is a perspective view of the double in
motorized breaker and more particularly-sound
motorized control assembly according to the invention.

. Figure 2 is a vertical sectional view of the
motorized control unit according to the invention
. Figure 3 is a plan view of the assembly of com
motorized control according to the invention; . Figure 4 is a general view of the mechanism
the motorized control unit and more particular
of the pinion uncoupling mechanism
trainer; - Figure 5 is a detailed perspective view of
the lower part of the mechanical com device
Figure 6 and 7 are diagrams illustrating the
operation of the main mechanical parts of the
locking mechanism and locking device
tion .; . Figure 8 is the electrical diagram of the circuit
ordered.

The basic embodiment of the invention will be described below. It is understood that one can imagine slight variations or variations without departing from the framework and the spirit of i 'i nvent on
The motorized operating assembly according to the invention is called upon to control a power switch 1 comprising two translation switches 2 and 3, the bodies of which are mounted superimposed so as to form a compact assembly constituting a multipolar inverter between the supply network. in electrical energy, an emergency unit and an electrical supply circuit or any other electrical circuits.

 The contact carrier bar of each power switch is actuated by a control rod 4 and 5 respectively in connection with a mechanism actuating a limit switch 6 and 7 which will be found below in the diagram é! electric. These limit switches are preferably arranged in a cavity transverse to the body of each power switch 2 and 3.

Each switch 2 and 3 is operated by a part secured to the switching on and off of the switch.

 We will now describe the operating assembly proper.

 Each link is articulated by means of a pivoting driving lever 8 and 9 to a control shaft 10 driven in rotary movements by a geared motor group 11 there through a gear 12 with bevel torque conventionally composed of a reference to right angle formed by a conical driving pinion 13 and a complementary drive pinion 14 integral with the control shaft 10. Said shaft 10 can be manually operated by insertion of a control handle 15 mounted at the end upper during the maneuver which has the effect of locking any electrical maneuver of the motor after release of a locking device 16 and of a release mechanism 17 in connection with a lockout 18 by padlocking which will be described below .

 The locking device 16 comprises a movable plate 19 for controlling the locking, situated above the casing 20 housing the motorized control assembly. This plate 19 is mounted on the control shaft 10 in elastic return in the high position by a coaxial spring 21 and immobilized in the high position by a stop 22. This mobile plate 19 has two vertical locking fingers 23 and 24 and a rod unlocking 25 developing downwards, for example of square section, comprising at the lower end, an oblique thrust ramp 26 passing through the upper face 27 of the casing 20, in order to actuate in translation a locking plate 28 kept horizontal slidingly perpendicular to the 'shaft 10, for example by three pivot-washers 29, 30 and 31 or any other equivalent means, under the upper face 27 of the casing 20 mounted in elastic return to a locking position by two springs such as 32.

 The stop 22 is produced for example in the form of an enlargement of the base of one of the vertical fingers 23 or 24 (Figures 4 and 7).

 The locking plate 28 has a square opening 33, slightly offset in the locked position relative to the vertical of the locking rod 25. The vertical displacement of the locking rod 25 causes by action on the edge of the opening 33 of the thrust ramp 26 with which its lower end is provided, a horizontal resultant thrust which has the effect of releasing, by displacement of the plate 28, the shaft 10 from its blocking resulting from the interposition of the plate 28 as will be seen below. Conversely, the withdrawal of the locking rod 25 causes the automatic retraction of the plate 28 under the action of the return springs 32 for blocking the control shaft 10 in vertical movements.

 The rear configuration of the locking plate 28 will be examined below, making it possible to block the shaft 10 in vertical movements and simultaneously take up the coupling and immobilize the padlocking support in connection with an electrical locking. .

 As shown in FIG. 6, the locking plate 28 has a V-shaped rear edge with asymmetrical ramps 34 and 35, the hollow of the tip of which is housed in the annular volume 36 for reducing the diameter of the thickness of the plate, conforms the control shaft 10 to the right of said plate. Thus and as already indicated, the interposition of the plate by contact of the converging ramps 34 and 35 with the control shaft 10 causes it to block in vertical movements and, consequently, immobilization in engagement of the bevel gear. attack 13 against the drive pinion 14 of the control shaft 10 and its return upwards after manual operation under the effect of a coaxial return spring 37 which is provided at its base.

 The above arrangement and the use of a bevel gear which is easy to disengage makes it possible to choose the force of the return spring 37 so as not to make difficult or prevent the manual operation of unlocking by excessive pressure. on the coupling gear and on the release plate.

For security reasons, the locking and unlocking movements of the plate 28 are detected by a microswitch 38 whose actuation pusher 39 is constrained to push along the longitudinal edge of said locking plate to
With the exception of a recess 40 in which is housed, when arriving opposite it, the pusher 39 disposed at a distance such that it corresponds to the locking position of the plate 28.

 One of the vertical fingers 23 or 24 of the movable plate 19 for controlling the locking and the oblique ramp 35 on the rear side of the locking plate cooperate with a locking lever-support link 41 of the locking device 18 by padlocking. Its end 42 protrudes outside the casing 20. It has an opening 43 for the passage of one or more padlocks 44. This support link comprises a blocking light 45 located in the link position extended to the right of the finger 24 of the movable plate 19 preventing the descent of the corresponding finger and the introduction of the handle 15.

 Furthermore, a stud 46 cooperates with the inclined ramp 35 to generate the correlative movement of the support rod 41 in the extended position, its return by the springs 32 as well as the drive of the locking plate 28 thus ensuring, in addition, the electrical lockout by the microswitch 38 when the support ellette 41 is out and padlocked.

 We will now examine more particularly the lower part of the control mechanism located at the lower end of the shaft 10 with reference to FIG. 5.

 The lower control rod 5 is mounted at the end of the shaft 10 by means of the lower driving lever 9, the movements of which are limited by two mechanical stops 47 and 48 mounted on the lower wall 49 of the casing 20 as a safety measure. electrical circuit failure.

 On the control shaft 10 near the end of the coaxial spring 37 is mounted, parallel to the link 5, an indexing lever 50 carrying an immobilizing lug 51 with a rounded end constituting with openings 52, 53 and 54 in the wall 49 an indexing stop 55 with three positions corresponding to the two engaged positions of one and the other translation switch 2 and 3 and to the neutral position corresponding to the open circuit.

 The slightly flexible indexing lever 50 driven by the shaft 10 marks the above positions by the slight blocking resulting from the partial penetration of the rounded end of its lug 51 into one or the other opening 52, 53 or 54.

 Precutting microswitches 56 and 57 are mounted on the bottom wall 49 and actuated by the lever 50.

 The arrangement of these microswitches relative to the indexing lever 50 which actuates them is chosen to enable them to perform the function of auxiliary pre-break contacts whose detection signal can be used for various predispositions in the supply circuit, by example of opening the protective contactor beforehand.

 The electrical control circuit, the diagram of which is shown in FIG. 8, is mounted on a plate 58 and has numerous electrical safeties, several of which act as a complement to the mechanical safeties described above.

 After the rectification-filtering by the circuit 59 to form the DC supply voltage of the relays, the relay circuit is supplied through several electrical safeties including the lockout locking contactor 60 (electrical padlocking), the manual contact 61 and the 'thermal fault switch 62 on the motor.

 The power supply control of the electric motor is effected through the contacts 63 of a supply relay 64 also used for braking in one direction of rotation and in the other by shorting the inductor windings and armature through a low resistance 65 via the contacts 66 and 67 resulting from the control provided by the limit switches o and 7 through the corresponding relays of motor logic position 68 and 69.

Various other relays provide the following functions
. power relays 70 and 71 connected to the circuit
input 72 of external controls,
. self-sustaining relays 73 and 74,
. signaling output relay 75 and 76 comman
in contacts 77 for signaling by
position indicator lights 78, 79 and 80,
. zero position relay 81,
. direction of rotation memory relay 82.

 Output contacts 83 for the exploitation of the precut signals delivered by the microswitches 56 and 57 are available on the wafer 58 receiving the circuit.

 The relays 68- and 69 of the motor logic position actuate contacts provided in two logic circuits 84 and 85 specific to the operating positions of the power switches 2 and 3 controlled.

 The advantage of the present invention lies in its various mechanical and electrical safety as well as in the ease of coupling and uncoupling of the drive by electric motor through a large reduction.

 The invention has been described in detail above; It is understood that it cannot be limited to the means described alone, but that, on the contrary, all direct variants, simple modifications, substitutions by equivalent materials or means, additions of inoperative elements and other changes without inventive contributions are perfectly within its scope. frame.

Claims (10)

 1. Motorized maneuvering assembly with remote control for a power switch actuating two power switches (2) and (3) from a single command by an electric geared motor assembly (li) comprising a control shaft (10) operating rods (4) and (5) for displacement, contact carrier bars mounted on said shaft through pivoting driving levers (8) and (9), by acting on limit switches (6) and (7) characterized in that the movement is transmitted by a bevel gear (12) and in that the manual uncoupling is effected by vertical displacement of the control shaft (10) and protected by a locking device (16 ) associated with a decoupling mechanism (17) in connection with a lockout (18) by padlocking controlled by the movements of the decoupling mechanism (17).  2. Operating assembly according to claim 1 characterized in that the locking device (16) comprises a movable plate (19) for controlling the locking mounted on the control shaft (10) in elastic return upwards, said plate having two vertical fingers (23) and (24) and a locking rod (25) developing downwards, passing through openings the upper face (27) of the casing (20), the lowering of this plate (19 ) causing the release or disengagement of an unlocking device.  3. Assembly according to claim 2 characterized in that the unlocking rod (25) has a lower end in an oblique thrust ramp (26) for the translation of the unlocking device.  4. Assembly according to claims 1, 2 and 3 characterized in that the unlocking device is a plate (28) slidably mounted in elastic return perpendicular to the shaft (10) by engagement of the end of the locking rod in an opening (33) provided in said plate in order to release its rear end from a blocking space on the shaft (10) in which is housed its rear end.  5. An assembly according to claims 1 and 4 characterized in that the plate (28). has a V-shaped rear end along two oblique ramps (34) and (35), the junction area of which is inserted into an annular volume (36) for reducing the diameter of the shaft (10) in order to block it in translational movements.  6. An assembly according to claim 1 characterized in that the locking device (18) has a blocking opening (45) through which one of the fingers of the plate (19) passes in the low position, and one end provided with an opening ( 43) for the passage of a padlock and a stud (46).  7. An assembly according to claims 1, 5 and 6 characterized in that the stud (46) cooperates with the ramp (35) of the rear end of the plate (28) for movement or locking or electrical and mechanical interlocking.  8. An assembly according to claims 1 and 4 characterized in that the unlocking movement of the plate (28) is detected by a switch mounted fixed along one of the edges of said plate sensitive to the passage of a change in relief on said edge.  9. The assembly of claim 1 characterized in that the shaft (10) comprises in the lower part an indexing device in the form of a lever (50) integral with the shaft (10), lever having a lug ( 51) plugging into openings and actuating microswitches of precut or prefermeture (56) and (57) mounted on the lower wall  10. The assembly of claim 1 characterized in that the electric motor of the geared motor assembly (11) is braked by the short-circuiting of its inductor and armature windings.