FR2472127A1 - MULTI-CHANNEL VALVE WITH MECHANICAL REMOTE CONTROL DEVICE - Google Patents

Abstract

REMOTE CONTROL DEVICE PROTECTED AGAINST THE CONSEQUENCES OF A RUPTURE OF THE LINK HOSE. DRAWER 5 OF VALVE 2 IS ACTUATED BY A REMOTE CONTROL 3 WITH HANDLE 34 AND HOSE 51 CONNECTED TO DRAWER 5. RETURN SPRING 6 RETURNS DRAWER 5 TO AN EMERGENCY SWITCHING POSITION NEXT TO THE CONTROL POSITIONS A CYLINDER 19 ACTIVATING A SHOVEL 22. IN THE EVENT OF A CABLE BREAK, THE SPRING 6 MOVES THE DRAWER 5 INTO THIS EMERGENCY POSITION, WHICH STOPS THE CYLINDER 18.

Description

2247212 7

  The present invention relates to a

  with 1) a multi-position control element to

  a hydraulic remote control device which acts on the control element and which comprises a) an operating element, b) a locking mechanism coupled to the element, with a locking element pushed by a locking spring, and c) a return device with at least one spring

  return, pushing the actuating element towards its posi-

  3) a traction device placed between the operating element and the control element and 4) a return spring which is placed close to the control element and which

  Permanently under tension the traction means.

  We know a control valve with a drawer that

  can be brought in three positions by means of a tele-

  mechanical control comprising an operating lever, the average position being the neutral position. The other two positions are control positions for the advance and retreat of a hydraulic actuator having for example the shape of a cylinder. Such an actuator is, for example, placed on a tractor, an excavator or the like, and serves to raise and lower work equipment. The remote control device has a locking mechanism coupled to the operating lever. It has a movable part with locking notches and a pawl that is pushed by a spring against the moving part and its notches. The moving part is submitted directly

  to the action of a return device consisting of compression springs

  pressure and spring cuvettes, the return device tending to push the movable part of each of its control positions to its neutral position. The remote control device further has a traction cable hooked to the moving part and connected to the drawer, a return spring acting on the valve spool and tending

  the traction cable and a safety device

  against breakdowns, which acts directly on the drawer. The safety device contains a fixed release and a movable trigger adjustment device with an adjusting spring.

  variable voltage. The trigger adjustment device is

  rusty by this one. Unlocking occurs when, after pulling the pulling cable, the return spring has moved the drawer together with the trigger adjustment device

  so that it meets the trigger. After unlocking

  In this case, the adjusting spring prestresses the drawer in the opposite direction of its previous movement and moves it through the nearest control position to the neutral position. One disadvantage is that during the time the drawer

  to reach its neutral position, the hydraulic actuator engages

  and may cause damage. In addition, the technical expense for the complicated trigger trimmer and the trigger is

  important. In addition, there is the risk that, as a result of

  unsuitable surveillance or repair, the trigger regulator

is inefficient.

  The control valve and its mechanical remote control device are characterized in that the control element

  of the valve can be brought by the return spring into a posi-

  in the direction of action of the spring,

  switching positions, which serve to control the action-

  neur in the alternate directions of operation. Thanks to this characteristic, the device of the invention has the advantage that, if there is a rupture of the traction means (for example cable), the control element, to stop the hydraulic actuator, must move simply in one direction, what happens inside a

  particularly short time interval. The risk that it

  Therefore, damage after cable break is greatly reduced by the invention. Another advantage of the valve

  of control of the invention consists in that it is of a construction

  considerably simpler and in that it is

  less expensive. Because of the simpler editing, it is

  also safer. In addition, the risk of an over-

  Incorrect monitoring or repair prevents the emergency switching of a safety device that must be actuated by a trip unit. According to another characteristic of the invention, the unlocking device has a control switch

  manual and an electromagnet controlled by this switch and the elec-

  third magnet, acting in the opposite direction of the spring, is associated with

1 element.

  According to another characteristic of the invention, the device for unlocking the element comprises an operating means associated with the lever and actuated by hand, which acts on the element, against the action of the spring, via 'ele-

mechanical elements.

  According to another characteristic, the maneuvering means

  is a push button sliding along the lever.

  According to another characteristic of the invention, a control cam, movable towards the element and attacking

  this one, is housed on the sector.

  According to another characteristic of the invention, at least one tubing connected to the valve has been connected to at least one pressure switch which controls the electromagnet of the device.

unlocking.

  Thanks to the previous characteristics, the valve

  can be operated in a particularly convenient and sensitive manner.

  These advanced features can be transferred to control valves operated directly or via pull-and-press linkages. Due to the electromagnet, the device can be controlled remotely by

  limit switches, pressure limiting switches and

  gists. According to another characteristic of the invention, an electromagnetically controlled stop block is disposed downstream of the control valve. This feature is particularly interesting because it is also used for the block maneuver

  stop any current source anyway.

  Other features and advantages of the invention

  will be better understood by reading the following description

  of an exemplary embodiment and with reference to the accompanying drawings, in which: - Figure 1 shows, partially schematically and partially in section, a control valve with remote control device; FIG. 2 represents a detail of the exemplary embodiment of FIG. 1; and - Figure 3 shows in section other details

  of the embodiment of Figure 1.

  A control valve, designated 2 in Figure 1, is connected to a remote control device 3. The valve 2 has a housing 4, a control element in the form of a spool 5 and a return spring 6 acting on the spool 5 and seeking to move it to the right. The casing 4 is connected by a tubing 7 to a pump 8. A suction connection 9

  pump 8 enters a reservoir 10 of hydraulic fluid.

  Between the casing 4 and the tank 10, a return pipe 11 is arranged. A pressure switch 13 is connected to the pipe 7 by another pipe 12. A stop block 14, which has two electromagnets 15, is connected to the casing 4. A hydraulic actuator 18 is connected to the block 4 by tubings 16, 17. This actuator 18 consists of a double-acting jack 19 o out of a piston rod 20. It acts by an axis 20 'on a lifting arm 21 which carries a shovel 22. The arm 21 is supported by means of a shaft 23 by a tractor, an excavator or the like. A control cam

  24 is connected to the arm 21. Two tractor switches have been placed on the tractor.

  25, 26 so that they are actuated by the cam 24 when

  the lift arm reaches determined inclination positions.

  The remote control device 3 has a housing 30,

  a housing base 31, a first inclination axis 32 placed in -

  the housing 30, a sector 33 carried by this axis, an operating means attached to the sector 33 and having the form of a hand control lever 34 with a handle 34 ', an axis 35 fixed to the sector 33, a

  return device 36 fixed to the casing 30, a locking mechanism

  37 and a flexible traction means in the form of a cable 39.

  The return device 36 consists of a housing 41, a rod 42 with axial abutment surfaces 43, 44, two spring cuvettes 45, 46 freely surrounding these two surfaces 43, 44 and a return spring 47 placed between the two cups 45, 46 and freely surrounding the rod 42. This rod is supported as well

  in the housing 41 than in the housing 30, with longitudinal mobility.

  The spring 47 acts so that when the locking mechanism 37 is unlocked in a manner described below, the rod 42, after any displacement from the drawn neutral position, is returned to this position. The rod 42 is articulated by an axis 48 to an intermediate element 49. The latter is articulated by means of the axis 35 to the sector 33. As a result, an inclination of the sector 33 with the lever 34 displaces the rod 42. The cable 39 is connected to a nipple 50 attached to the rod 52. The cable 39 passes through a guide sheath 51 in a sheath support 52

  attached to the casing 4. Inside the sheath holder 52 moves longitudinally

  tudinalement a connecting piece 53 which is connected on the one hand with the cable and on the other hand with the operating rod 54. It passes through an annular seal 55 placed in the sheath holder, to

  drawer 5, and is connected thereto by means of a device

  56. Between the sheath 51 and the sheath holder 52, there is

  introduces a hollow adjustment screw 57.

  Figure 2 schematically shows the distribution valve 2 to 6 lanes / 5 positions. The drawer 5 is movable inside the casing 4 in five different positions, 1, 11, III, IV and V. The average position III is the neutral position. When the drawer 5 is in this neutral position III, the pipes 7, 11, 16 and 17 are closed. If the drawer 5 is brought to the right in Figure 1, in the adjacent position, the pipes 7 and 16 and the pipes 11 and 17 are connected together. The jack 19 is biased, so that the arm 21 and the shovel 22 are raised. If the drawer 5 is brought against the action of the return spring 6 beyond the neutral position III in the position II, the arm 21 and the shovel 22 are lowered. In the position I, the tubings 16 and 17 are connected to the return pipe 11 and the tubing coming from the pump 8 is closed. The drawer 5 brought to the position I acts so that a force applied from the outside freely moves the rod 20 in the direction of the force. This control position I is therefore referred to as the "free passage position". If the drawer 5 is smooth following the action of the spring 6, it moves to the position V which, from the neutral position III, is connected to the position IV. The drawer 5 and the casing 4 surrounding it are constituted so that in the position V of the drawer 5, for example, the same control effect occurs if the drawer 5 was in its neutral position III. This position V thus constitutes a position of engagement or emergency release. The locking mechanism 37 consists of the

  sector 33, which has three lock slots on its periphery

  60, 61 and 62, a locking member 64, which carries a claw 65 pointing to the sector 33 and which is articulated on a second axis 66 disposed in the housing 30, as well as a locking spring 67. This is introduced into the bottom 31 of the housing and inclines the element 64 towards the sector 33. For an appropriate position of the sector 33, the claw 65 enters one of the notches 60, 61 or 62 and causes on the sector 33 resistance to rotation. An unlocking device 70 is associated with the mechanism 37. The device 70 consists of a push button 71 movable in the longitudinal direction of the lever 34, a return spring 72 for the button 71, a pressure rod 73 associated with the button 71, a switch 74 attached to the sector 33 and actuated by the rod 73, and an electromagnet 75. A

  pressing the button 71 actuates the switch 74. The electro-

  magnet 75 is switched on or off by this switch 74,

  according to his position. With the aid of a reinforcing rod 76, the electro-

  magnet 75 acts on an arm 64 'disposed on the element 64, so that it is inclined against the action of the spring 67. By engagement of the electromagnet 75, the element 64 can be

  spaced from the sector 33, so that the claw 65 releases the sector 33.

  Inside the return device 36, a compensation spring 77 is placed which acts against the bowl of

  spring 46. This spring 77 opposes the spring 6 through the

  of the cable 39 so that a weak force is sufficient to move the slide 5 in variable directions in the vicinity of its neutral position III by means of the lever 34. The device 36 acts so that the rod 42 and the drawer 5 are brought into their neutral positions when the claw 65 does not penetrate into one of the notches 60, 61 or 62. The adjusting screw 57 is adjusted so that, when the rod 42 is in the neutral position, the drawer 5

  is also in its neutral position III.

  The valve 2 and its remote control 3 operate as follows. When the lever 34 is tilted from the neutral position III in a clockwise direction, the rod 42 and the bowl 46 are moved against the action of the spring

  47. As a result, the nipple 50 moves towards the sheath 51.

  The spring 6 pulls on the cable 39 towards the casing 4 via the drawer 5 and the rod 54. If the lever 34 continues to incline in the direction of clockwise, the claw 65 ends by snap into the notch 60. At the same time, the drawer 5 inside the housing takes the position IV, so

  that the pump 8 is connected through the block 14 with the tubing 16.

  As a result, the arm 21 rises. Claw 65 keeps the sector

  33 in the position reached until, by sufficient force,

  on the hand control lever, the claw 65 is driven out of the notch 60, or until, by pressing the button 71, the electromagnet 75 leaves the claw 65 of the notch 60 As soon as the claw 65 is outside the notch 60, when the lever 34 is released, the sector 33 is brought by the device 36 into the neutral position. In case of inclination of the lever 34, also from the neutral position III, in the opposite direction of clockwise, the claw 65 finally enters the notch 61 which is associated with the position II. The rod 42 is then moved to the right and, by the cable 39, it pulls the drawer 5 against the force of the spring 6. The movement of the slide 5 as described causes the arm 21 to be lowered. this position, the drawer 5 can also be returned to position III as described. If the lever 34, from the position II, is inclined more counterclockwise, the claw 65 reaches the notch 62 and the drawer 5 in its position I, the position called free passage . From this position also, the drawer 5 can be brought back in the way

  described above in the neutral position III. In the case of arra-

  With the cable 39, if the slide 5 is in one or between two of the positions I to IV, the spring 6 quickly returns the slide to the right in position V. This position V is the emergency switch position described referring to Figure 2. The

  drawer 5 brought into the emergency cut-off position stops the

hydraulic actuator 18.

  Switches 25 and 26 serve as limit switches and are actuated by control cam 24 when

  the lever 21 reaches its end position determined by construction

  chosen or chosen for each type of implementation. The commutations

  25 and 26 are connected as the switch 64 to the electro-

  magnet 75. As a result, the hydraulic actuator 18 can actuate, by the cam 24 and the switches 25, 26 themselves, the unlocking device 70 and act so that the drawer 5 is brought back

  in its neutral position III. In the same way, a rise of

  excessive sion in the pipes 7 and 12, mounted for example by an overload. of the arm 21, can control the device

  unlocking 70 by the switch 13.

  The stop block 14 introduced between the valve 2 and the tubings 16 and 17 protects the actuator in a known manner.

  hydraulic 18 of what is called cavitation. His electro

  magnets 15 serve for unlocking. The electromagnets 15 are

  corded to a switch 78 which is placed inside the housing 30.

  On the sector 33, there is a control cam 79 which actuates the switch 78 when the lever 34 is in its neutral position III. As a result, the switch 78 is always actuated without special intervention of an operator, when the drawer 5 reaches its neutral position III. The electromagnets 15 are connected to a power supply apparatus 80 which is also used to

power the electromagnet 75.

  Instead of a drawer 5 movable in a straight line, one could also use a rotating drawer. The spirit of the invention also applies to control valves with seats, in which the moving elements are actuated by means of

control cams or the like.

  In place of the switch 74, it is possible, for example, to associate the segment 33 with a not shown movable control cam, or the like, so that it can be pushed using the

  button 71 and the rod 73 against the claw 65 or the element 64.

  The button 31 can be replaced by an operating lever or a

  movable tubular handle on the lever 34.

  Of course, various modifications may be made by those skilled in the art to the devices or methods which have just been described solely as nonlimited examples.

  tative, without departing from the scope of the invention.

Claims (9)

R E V E N D I C A T I 0 N S   1 - Control valve with 1) a control element   several positions to control a hydraulic actuator   2) a mechanical remote control device which acts on the   a control member (34), b) a locking mechanism (37) coupled to the member (34), with a locking member pushed by a locking spring, and c) a return device (36) with at least one return spring (47), pushing the operating element towards its neutral position, 3) traction means (39) placed between the operating element and the element 4) a return spring (6) which is placed close to the control element and which permanently maintains the tensioning means under tension, characterized in that the control element (5) of the valve (2) can be brought by the return spring (6) into an emergency position (V) which   connected, in the direction of action of the spring (6), to the   (II, IV) which serve to control the actuator (19) in   alternative senses of operation.   2 - Valve according to claim 1, characterized in that the control valve (5) and its control element (5) are constituted so that this element (5), when it is in its position (V) switching emergency, produce the same   cutoff effect only in the neutral position.   3 - Valve-according to any one of the claims   1 or 2, characterized in that the operating element is a lever   reclining (34) hand control.   4 - Valve according to any one of the claims   1 to 3, characterized in that the lever (34) is associated with a device   tif (70) for unlocking the locking element (64) the locking mechanism (37).   Valve according to any one of the claims   1 to 4, characterized in that the device (70) for unlocking   lage has a manually operated switch (74) and an electro-   magnet (75) controlled by this switch (74) and that the electro-   magnet (75), acting in the opposite direction of the spring (67), is associated to the element (64,65).   6 - Valve according to any one of the claims   1 to 4, characterized in that the device (70) for unlocking   of the element (64, 65) comprises an actuating means (71) associated with the lever (34) and actuated by hand, which acts on the element (64, 65) against the action of the spring (67) , through mechanical parts (73).   7 - Valve according to any one of the claims   1 to 6, characterized in that the actuating means is a   push button (71) sliding along the lever (34).   8 - Valve according to any one of the claims   6 and 7, characterized in that a control cam, displac-   çable towards the element (64, 65), and attacking it, is housed on the sector (33).   9 - Valve according to any one of the claims   1 to 8, characterized in that at least one pressure switch (13) is connected to at least one pipe (12) connected to the valve (2) and controls the electromagnet (75) of the device ( 70) unlocking.   Valve according to any one of the claims   1 to 9, characterized in that at least one   (25, 26) operated directly or indirectly by the action-   hydraulic switch (18, 19, 20), which switch controls the electro-   magnet (75) of the unlocking device (70).   11 - Valve according to any one of the claims   1 to 10, characterized in that a stop block (14) is   electromagnetic is arranged downstream of the control valve (2).