KR101904219B1 - Assembly comprising a security apparatus equipping a lifting device, in particular a winch, and system for actuating said apparatus - Google Patents

Abstract

The present assembly 1 comprises a safety device 2 comprising a lifting device, in particular a winch, and a system 3 for operating the device, the safety device 2 being of a gear type A wheel 5 and a worm 6 engaging the gear wheel. According to the invention, the assembly (1) also comprises: a spline shaft (15) fixed to one end of the worm (6); - a pocket-shaped wheel (21) having an inner and outer splines and coupled to the spline shaft (15); - an elastic member (22) between the pocket wheel (21) and the stop piece (23); A driving wheel 20 having a spline hub rule and rotatably engageable with the pocket type wheel 21; - a backup motor (35) capable of rotating the drive wheel (20).

Description

FIELD OF THE INVENTION [0001] This invention relates to an assembly comprising a lifting device, in particular a safety device with a winch, and a system for operating the device. BACKGROUND OF THE INVENTION < RTI ID = 0.0 >

The present invention relates to an assembly comprising a lifting device, in particular a safety device with a winch, and a system for operating the device.

A housing that slidably receives a worm, a "follower " motor that can rotate the worm during normal operation of the winch to follow the rotation of the gearwheel, follow-up motor "and a safety device including means for attenuating the sliding of the worm in the housing in the event of an abnormal failure of the winch. This safety device, known under the trademark "Motosuiveur", is described in European patent EP 1 253 102.

In normal operating conditions of the winch, the worm is in a normal position against the damping means, the follow-up motor rotates the worm at a speed matched to the gearwheel and is eventually rotated by the winch, Transparent ", ie the safety device does not interfere with the operation of the winch.

In the event of a winch failure, the shaft undergoes immediate acceleration caused by the weight of the load, which is transmitted to the gear-type wheel of the safety device, which prevents the worm from following the worm in the housing from the normal position described above to an abnormal position To slide the slider to the stop position when the attenuation capacity of the attenuation means is reached.

In one embodiment, these damping means comprise a piston against which the worm faces, a reduced cross section, a nozzle through which the oil immersed in the worm is pushed and passed by the piston, an elastic washer located between the ends of the worm, As shown in Fig. Such attenuation means is described in U.S. Pat. No. 7,331,252.

The safety device described above can prevent the load from dropping and monitor the abnormal failure situation.

At the end of this shutdown, it is necessary to regain control of the load to release the winch, which entails approaching the safety device to manually rotate the worm, since the following motor is not strong enough to rotate the worm (Which is not the role of the motor).

However, in certain circumstances this approach is impossible or limited, for example when winches are used in the nuclear industry. It is also tedious to operate the worm manually, the pitch of the worm is relatively small and the diameter of the gear wheel is relatively large.

The present invention aims at solving these important practical drawbacks.

Other abnormal situations exist when the operation of the winch is stopped, that is, for example, when a power loss causes the brake constituting the winch to lock the shaft of the winch. At this time, the load control can no longer be restored easily and quickly, that is, without manual adjustment of the safety device or winch.

The present invention also aims at solving this problem.

The assembly to which the present invention is applied is a "Motosuiveur" safety device as described above, that is, a gear type wheel fitted on a shaft of an elevating device, a worm engaging with the gear type wheel, a housing slidably receiving the worm, A motor called a "follow-up motor" which causes the worm to rotate during normal operation of the device to follow the rotation of the gearwheel, and a motor that causes the sliding of the worm in the housing in the event of an abnormal failure of the lifting device, And means for attenuating to a stop position.

According to the invention, the assembly also comprises:

A spline shaft fixed to one end of said worm and extending axially from said worm;

A pocket-like wheel having an inner and outer splines, slidably coupled to the spline shaft and rotatable together;

An elastic member having one end connected to the stopper fixed to the spline shaft and the other end connected to the pocket-shaped wheel;

A drive wheel having a spline hub rule and capable of rotatably coupling the pocket type wheel due to an outer spline constituting the pocket type wheel;

A motor called a "backup motor" capable of rotating the drive wheel,

Wherein the pocket-like wheel is movable with the spline shaft between a normal disengagement position and an unstable engagement position, the normal disengagement position being a position where the pocket-shaped wheel occupies other than the failure state of the elevating device and is not engaged with the drive wheel, The unstable coupling position is occupied by the pocket type wheel in the failure state of the lifting device and is rotatably engaged with the driving wheel so that the driving wheel is rotatably connected to the spline shaft and the worm.

During normal operation of the safety device, the pocket-shaped wheels are in the disengaged position and therefore the operating system formed by the backup motor and the drive wheel does not operate.

In the event of a failure of the lifting device, the worm moves to an abnormal stop position, in addition to blocking the load from dropping, compressing the elastic member and thus pushing the pocket-like wheel to the drive wheel. When the backup motor is rotated slowly, the drive wheel is rotated so that the spline of the drive wheel coincides with the spline of the pocket-like wheel, and the spline can be manually engaged. Therefore, a rotational connection of the drive wheel and the worm is made so that the worm is actuated by the backup motor and thus the load is moved upward or downward. When the load is stopped pressing the cable of the lifting device, the worm returns to its normal position and returns the pocket-shaped wheel to the separation position.

The present invention therefore provides a system for operating a safety device that has sufficient driving force to operate the worm in the event of an abnormal failure of such a winch and thus does not need to approach the worm and manually actuate the worm.

When the shaft of the elevating device is locked, particularly when it is locked after the automatic tightening operation of the brake constituting the elevating device, the follower motor can be operated to rotate the worm, and the worm can not be rotated, Moves to the abnormal position to press the damping means and moves to the stop position. In this manner, the pocket type wheel presses the driving wheel in the same manner as described above, and when the driving wheel is slowly rotated by the backup motor at this time, the pocket type wheel moves to the engaged position. And the backup motor can rotate the worm in the direction of rotation to maintain the aforementioned unsteady position of the worm, thereby rotating the gearwheel to overcome the frictional force generated by the brakes of the elevator.

Advantageously, the actuation system comprises means for locking the pocket-like wheel in the engaged position.

These locking means can maintain the pocket-like wheel in the engaged position despite the movement of the worm when the worm is rotated by the back-up motor in the direction of rotation that moves the worm away from the above-mentioned abnormal position to the opposite stop position. Therefore, the backup motor can be used to operate the worm.

According to a preferred embodiment of these locking means:

The side face of the male spline is in contact with the first side defining the boundary of the female spline of the drive wheel in accordance with the drive direction of the drive wheel, One side of the one side faces the side defining the boundary of the female spline;

The longitudinal splines of the pocket-like wheels having a wide front part constituting a transverse shoulder, the wide front part being able to protrude past the drive wheel at the engaged position of the pocket-like wheel, the drive wheel leaving the worm away from the emergency position, When driven in the direction of moving to the stop position, the pocket type wheel is kept in the engagement position against the drive wheel against the elasticity of the elastic member.

When the drive wheel is driven in the opposite direction, the wide front part is returned to the opposite side of the genome spline of the drive wheel so that the pocket-like wheel can return to the release position.

Advantageously, the wider front section has a thin front end, which allows the pocket-shaped wheel to advantageously engage the female splines of the drive wheel as it enters the engagement position.

Preferably, the actuation system also includes contactors, one of which detects the arrival of the worm at the abnormal position and the other detects that the pocket-shaped wheel is in the engaged position or in the disengaged position.

Other features and advantages of the present invention will become apparent from the following description, taken in conjunction with the accompanying schematic drawings, which illustrate one possible embodiment of an associated safety device / operating system assembly as a non-limiting example.

1 is a perspective view of a contactor constituting the device, a housing constituting the device, and an assembly removed from the case.
Fig. 2 is an overall side view in which a worm constituting the present invention is in a normal position and a pocket-shaped wheel constituting the present invention is in a disengaged position.
Figure 3 is an overall side view similar to that of Figure 2, with the worm in the unstable position and the pocket-like wheel in the engaged position;
4 is a perspective view of a drive wheel in which a pocket type wheel and the pocket type wheel are rotatably engaged.
Figure 5 is an enlarged perspective view of a pocket-like wheel similar to Figure 4;
6 is a partial cross-sectional perspective view of the assembly with the pocket-like wheel in the disengaged position;
Figure 7 is a partial cross-sectional perspective view similar to Figure 6 with the pocket-like wheel in the engaged position;
8 is a partial cross-sectional perspective view similar to that of Fig. 7 with the pocket-like wheel in the locked position; Fig.

Figures 1 to 3 show an assembly 1 comprising a lifting device, in particular a safety device 2 with a winch, and a system 3 for operating the device 2. [

The safety device 2 is a type known as a trademark "Motorsuiveur ", the principle of which is described in EP 1 253 102. This includes a toothed wheel 5 fitted to the shaft of a lifting device (not shown), a worm 6 engaged with the gear wheel 5, a housing 7 slidably receiving the worm 6 , A motor 8 called a "follow-up motor" that rotates the worm 6 to follow the rotation of the gear 5 during normal operation of the lifting device, (9) for attenuating the sliding of the worm (6) in the housing (7) within the maximum stopping range of the worm (6) in the event of a fault situation.

The worm 6 is axially extended above one side of the wheel 5 by a splined shaft 15 integrally formed therewith. This splined shaft 15 includes a drive wheel 20, a coupling / separating pocket type wheel 21, a spring 22 and a stopping piece 23 which are described below in order and are components of the operating system 3 .

2 and 3, the housing 7 includes an upper central portion 7a including an aperture for receiving the gear-shaped wheel 5 in an adjustable manner, a worm 6 in an adjustable manner, And one of the two coaxial-state extension portions 7c accommodating said means 9-13 for attenuating the worm 6, .

The follower motor 8 is positioned along the lower central portion 7b and drives the worm 6 through the wheel 24 and the belt 25. [

In the illustrated embodiment, the weight of the load lifted by the lifting and lowering device tends to rotate the gear-shaped wheel 5 in the clockwise direction as shown in FIGS. 2 and 3. Therefore, when the lifting and lowering device fails, Moves from right to left in Figs. 2 and 3. So that the damping means 9-13 are located at the extension 7c located on the left side of the safety device 2. [

These damping means are fixed to the piston 9 supporting the worm 6, the tube 10 in which the nozzle 11 with a small cross section is formed through the wall, the elastic washer 12 and the housing 7 so that the washer 12 Is located.

The piston (9) forms an inner chamber (26) in communication with the tube (10). The piston 9 presses the oil present between the piston and the washer 12 through the nozzle 11 and the oil then flows into the inner chamber 26, (See FIG. 2 and FIG. 3 for comparison). The nozzle 11 is axially aligned on the tube 10 and is gradually covered by the piston 9 while the worm 6 is moving so that the oil passage cross-section is gradually reduced in the area where the piston 9 moves. After passing through the last nozzle 11, the piston 9 compresses the washer 12, which defines the stop position of the worm 6 in the housing 7, within its compression limit, if the piston 9 continues to move.

In the opposite extensions 7c (i. E. Extensions located to the right in Figures 2 and 3), the device is able to attenuate the movement of the worm 6 from left to right in certain situations, Includes a series of washer (30) and stopper (31) similar to the washer (12) and stopper (13) described above.

In addition to the drive wheel 20, the pocket-like wheels 21, the spring 22 and the stop 23, the actuating system 3 comprises a motor 35 called a "back-up motor" And a reduction gear (36) driven by the motor (35).

The drive wheel 20 meshes with the pinion 37 (Fig. 6) at the output of the gear 36 and is driven by the motor 35. Fig. As shown more specifically in Fig. 4, the drive wheel includes a splined hub that can engage with the outer splines constituting the pocket-shaped wheels 21. [

The splined hub, seen in Figures 4 and 5, includes an inner spline which allows it to be rotatably engaged with the splined shaft 15 and which can be slid on a splined shaft, (20). The pocket type wheel 21 can move with the spline shaft 15 and with the worm 6 between the normal disengaged position and the abnormal disengaged position and the normal disengaged position is that the pocket type wheel 21 2 and 6). The abnormal unlocking position is a position where the pocket-like wheel occupies the failure state of the lifting device, and the pocket-like wheel is rotated with the driving wheel 20 The drive wheel 20 is rotationally connected to the spline shaft 15 and thus rotatably connected to the worm 6 (see FIGS. 3 and 7).

Also,

The female spline 20f of the hub of the drive wheel 20 has a width larger than the male outer spline 21m of the pocket type wheel 21 so that the female spline 20f of the hub of the drive wheel 20 can be moved along the drive direction of the drive wheel 20 relative to the shaft 15 The side surface of the male outer spline 21c is in contact with or defines the boundary of the same female transverse spline 20f in contact with a first side that defines the boundary of the female spline 20f in a transverse direction, With the second side of the opposite side of the < RTI ID = 0.0 >

Each male outer spline 21m has a wide front portion 21a which defines a transverse shoulder 21e projecting transversely to one of the sides of the spline 21m.

As shown in Fig. 5, each of the wide front portions 21a has side surfaces which are gathered with respect to each other in the direction of the front end of the pocket-shaped wheels 21, so that these wide front portions 21a are connected to the female splines 20f, Lt; / RTI >

6 to 8, these wide front portions 21a can protrude beyond the drive wheel 20 at the engaged position, that is, the drive wheel 20 can move in the direction of the worm 6 When driven to the stop position of the worm 6 with respect to the washer 30 in the direction from left to right (counterclockwise direction of the wheel 20 in Figs. 6 to 8) in Fig. 2 and Fig. 3, The direction shoulder 21 protrudes laterally beyond the female spline 20f, so that the pocket type wheel 21 is held at the engagement position (see FIG. 8). Thus, these transverse shoulders 21e form together with the drive wheels 20 means for locking the pocket-like wheels 21 in the engaged position.

The spring 22 is engaged on the shaft 15 in a state of being inserted between the pocket type wheel 21 and the stop piece 23 and one end is connected to the pocket type wheel 21 and the other end is connected to the stop piece 23 .

The spring 22 is loosened at the disengagement position of the pocket type wheel 21 shown in Figs. 1, 2 and 6, so that the disengagement position is defined. When the worm 6 moves from right to left until it contacts the washer 12, the stopper 23 moves with the shaft 15 to press the pocket-shaped wheel 21 against the hub of the drive wheel 20 The spring 22 is compressed.

Also as shown in Figures 2, 3 and 6 to 8, the operating system 3 comprises:

An assembly for detecting the normal position of an assembly of worms (6), shafts (15) and stoppings (23), comprising: a housing A detecting assembly formed by a contactor having a detecting member moving in a direction of the detecting assembly; And

- an assembly for detecting the engagement position of the pocket-like wheel 21, characterized in that it comprises a sleeve (41) with a shoulder covering the spring (22) and connected to the pocket-like wheel (21) and whether or not the end is on the opposite side of the shoulder Thus comprising a sensing assembly formed by a contactor 42 having a detecting member moving in a radial direction.

During normal operation of the safety device 2, the pocket-shaped wheels 21 are in the disengaged position, and therefore the operating system 3 does not operate (see Figures 2 and 6).

The worm 6 is moved toward the emergency position in contact with the washer 12 in order to prevent the load from dropping and to allow the pocket type wheel 21 to come into contact with the hub of the drive wheel 20, 22 to compress the pocket-shaped wheel 21 by applying pressure. At this time, if the backup motor 25 is rotated slowly, the drive wheel 20 is rotated to align the spline 20f of the drive wheel 20 with the portion 21a of the spline 21m, do. Therefore, the driving wheel 20 and the worm 6 are connected in rotation, and the worm is operated by the backup motor 35, so that the load is moved upward or downward.

When the gear type wheel 5 can not operate, particularly when the load is lowered and the load application on the safety device is stopped, the worm 6 returns to its normal position by its rotation. The forward end 21a of the spline 21m is on the opposite side of the female spline 20f when the worm 6 is operated in the screwing direction with respect to the gear type wheel (clockwise drive of the drive wheel 20) Therefore, when the worm 6 is operated in the screwing direction with respect to the gear-shaped wheel 5 (when the driving wheel 16 is rotated) The forward end 21a of the spline 21m is shifted with respect to the female spline 20f and the shoulder 21e is brought into contact with the drive wheel 20 and the spring 22 is rotated in the counterclockwise direction, And the drive wheel 20 is rotated clockwise by using the backup motor 35 to move the female spline 20f to the opposite side of the front end 21a of the spline 21 so that the shoulder 21e, So that the spring 22 is not in contact with the driving wheel 20, So that the pocket type wheel 21 is returned to the separation position by the elastic return effect.

In the locking state of the shaft of the elevating device, in particular, in the locking state following the automatic tightening operation of the brake composed of the elevating device, the follower motor is operated to rotate the worm 6 in the screw- . At this time, since the gear type wheel 5 can not rotate, this drive moves the worm 6 toward the washer 12 within the stop position range of the worm against the washer 12. The pocket type wheel 21 presses the drive wheel 20 at this time and when the drive wheel is slowly rotated by the backup motor 35 at this time, the pocket type wheel 21 is moved to the engagement position I will go. The backup motor 35 then rotates the gear 5 in a clockwise direction by driving the worm 6 in the direction of thread engagement with the gear 5 So as to overcome the frictional force generated in the brakes of the elevating apparatus and thus to move the load downward.

The worm 6 is rotated by the backup motor 35 in the screwing direction with respect to the gear type wheel 5 to drive the wheel 20 in the counterclockwise direction, To the stop position for the washer 30. At the beginning of the movement of the worm 6, the shoulder 21e is brought into contact with the drive wheel 20 so that the pocket-like wheel 21 can be held in the engaged position . When the load is controlled, the drive wheel 20 is driven clockwise to return the female spline 20f to the opposite side of the wide front end 21a of the male spline 21m, so that the pocket- .

As can be seen, the present invention provides the following decisive advantage to an assembly comprising a safety device 2, called "Motosuiveur ", and a system 3 for operating the safety device:

The operating system 3 has sufficient driving force to operate the worm 6 in the event of a failure of the lifting device and therefore does not need to approach the worm 6 and manually actuate the worm 6;

In the case of stopping the operation of the elevating device, particularly when the brake constituting the elevating device is tightened until it obstructs the shaft of the elevating device, the assembly (1) facilitates load control without manual adjustment of the safety device or the elevating device It can be quickly restored and this load can be moved upward and downward.

The present invention has been described with reference to the preferred embodiments. It is needless to say that the present invention is not limited to the above-described embodiments but extends to all other embodiments included in the appended claims.

Claims (5)

An assembly (1) comprising a lifting device, in particular a safety device (2) with a winch and a system (3) for operating the device, wherein the safety device (2) comprises a gear- A worm 6 engaging with the gear-type wheel, a housing 7 slidably receiving the worm 6, and a worm 6 rotatable in a gear- A motor 8 called a "follow-up motor" that follows the rotation of the wheel 5 and the sliding of the worm 6 in the housing 7 in the event of an abnormal failure of the lifting device, In an assembly (1) comprising means (9-13) for attenuating to the rest position of the worm (6)
The assembly 1 also comprises:
A spline shaft (15) fixed to one end of said worm (6) and extending axially from said worm;
- a pocket type wheel (21) slidably coupled to the spline shaft (15) and rotatable together;
An elastic member 22 having one end connected to the stop piece 23 fixed to the spline shaft 15 and the other end connected to the pocket-shaped wheel 21;
A driving wheel 20 having a spline hub rule and allowing the pocket type wheel 21 to rotate rotatably due to an outer spline constituting the pocket type wheel 21;
A motor 35 called a "backup motor" capable of rotating the drive wheel 20,
The pocket type wheel 21 can move together with the spline shaft 15 between a normal separation position and an abnormal engagement position, and the normal separation position is such that the pocket type wheel occupies other than the failure state of the lifting device, And the unsteady coupling position is a position in which the pocket-like wheel is engaged in a failure situation of the elevating device and is rotatably engaged with the driving wheel 20 so that the driving wheel 20 is coupled to the spline shaft 20, (6). ≪ / RTI > 2. Assembly according to claim 1, characterized in that the actuating system (3) comprises means (21e, 20) for locking the pocket-like wheel (21) in the engaged position. 3. The method of claim 2,
Since the female splines 20f of the drive wheel 20 have a greater width than the male splines 21m of the pocket-like wheels 21, the side surfaces of the male splines 21m are arranged in the direction of the drive wheel 20 Abuts against a first side defining a boundary of the genome spline (20f) of the drive wheel (20), or on a side opposite the first side, defining a boundary of the genome spline (20f);
- the male spline 21m of the pocket type wheel 21 has a wide front portion 21a constituting the transverse shoulder 21e and the wide front portion 21a is located at the engagement position of the pocket type wheel 21 When the drive wheel 20 is driven in a direction to move the worm 6 from the emergency position to the opposite stop position, the drive wheel 20 is driven to move the drive wheel 20 against the elasticity of the elastic member 22, (21) in said mating position while abutting against said pawl (20). 4. The assembly of claim 3, wherein the wide front portion (21a) has a thin front end. 5. A system according to any one of claims 1 to 4, characterized in that the operating system (3) further comprises a contactor (40, 42), one of which detects the arrival of the worm (6) One of which detects that the pocket-like wheel (21) is in the engaged position or the disengaged position.

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