JPH0726302Y2 - Drop prevention device for rope type elevator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a fall prevention device for a rope-type elevator.

[Conventional technology and its problems]

Generally, for rope-type elevators, a passenger cage
And a counterweight are hung with a wire rope, hung on a sheave of a hoisting machine in a fishing bottle type, and by rotating this sheave, the riding cage is moved up and down by the frictional force with the wire rope, or with a drum. A method is used in which the passenger cage is wound up with a wire rope to raise the passenger cage, and the passenger cage is rewound with its own weight to lower the passenger cage. In either method, it is usually required by law to suspend the riding cage with two or more wire ropes.

By the way, nuclear power plants are equipped with elevators used for inspecting nuclear reactors, but it goes without saying that the general equipment at nuclear power plants is, during operation, accidents, earthquakes, and virtual accidents. It requires engineering safety equipment with multiplicity so that it can sufficiently bear the load of.

Therefore, the present applicant has proposed the following elevator for a nuclear power plant (see Japanese Utility Model Laid-Open No. 1-65277).

This will be described with reference to FIG. 1 showing the present embodiment. In addition to the two lifting wire ropes 2 wound around the drums 6 and 6, a fall prevention wire rope 9 is provided and The wire rope 9 for prevention is automatically wound up by a wire rope drum 12 for fall prevention by a spring force provided therein, or rewound by the weight of the riding cage 1 itself. When the lifting wire rope 2 is cut, the drop-preventing wire rope drum 12 is immediately fixed, and the riding cage 1
Proposes that the passenger cage 1 can be prevented from falling by being supported by the fall preventing wire rope 9. An electric system such as a solenoid and a limit switch is used to fix the rotation of the drop prevention wire rope drum 12.

However, in the event of a power outage at a nuclear power plant, the 6000KW diesel engine used for private power generation facilities is automatically started at the same time as a power outage, and the condition of entering rated operation within 8 seconds is imposed. At the time of a virtual accident in which the disconnection of the lifting wire rope 2 and a power failure accident occur at the same time, the drop prevention wire rope drum 12 cannot be stopped by the power generation by the diesel engine.

On the other hand, a lifting device including a mechanical safety device that does not use an electric system is known. For example, according to Japanese Utility Model Publication No. 46-9700, in an elevating device such as a stacker crane, a drop preventing wire rope is provided in addition to the elevating wire rope wound around a drum. If the wire rope for lifting is cut by being wound up or rewound by the wire rope for fall prevention, the ratchet pawl is forced by the spring force on the ratchet wheel provided on the drum of this wire rope for fall prevention. A safety device has been proposed in which the rotation of the drum is stopped, and the lifting object is supported by a wire rope for fall prevention.

However, in such a safety device, since the equalizer beam, the lever type link, etc. are interposed between the lifting wire rope and the ratchet claw, the mechanism becomes complicated, and there is rusting and dust accumulation, It is doubtful that it will work reliably in the event of an emergency with a broken wire rope, which occurs very rarely. Therefore, it cannot be applied to an elevator for a nuclear power plant that places importance on multiple safety.

Moreover, in such a safety device, since the lever type link is interposed between the lifting wire rope and the ratchet pawl, a large impact force is generated when the drum for winding the fall prevention wire rope is suddenly stopped. Since it is transmitted to this lever type link, it is difficult to withstand the impact force because it is a lever type link, and the reliability of the safety device is reduced.

[Means for Solving the Problems]

Therefore, the present invention was devised to solve such problems, and the gist thereof is (1) an elevator equipped with a lifting rope drum and a fall prevention rope drum, Winding up and down the lifting rope with a lifting rope drum, and raising and lowering the riding cage by rewinding, while taking up the fall prevention rope with the fall prevention rope drum, as the lifting rope is raised and lowered, In a fall prevention device for a rope-type elevator that prevents the passenger cage from falling by a fall prevention rope when rewinding or cutting the lifting rope, in order to sandwich and stop the flange attached to the fall prevention rope drum One pair of wedge-shaped clamping pieces are provided, and pinions are integrally provided on these wedge-shaped clamping pieces,
One of the racks meshed with these pinions is connected to one end of a reciprocating connecting rod on which a coil spring for biasing the wedge-shaped holding piece is fitted and arranged.
The other end of the connecting rod is passed through a support to be connected to one end of the lifting rope to release the wedge of the wedge-shaped holding piece, and a spring case integrated with the connecting rod. A fall prevention device for a rope-type elevator, characterized in that the end of the rope is brought into contact with the supporting base to stop the movement of a connecting rod that interlocks with the lifting rope. An elevator equipped with a drop-prevention rope drum, wherein the elevator rope drum winds and unwinds the lift rope to raise and lower the passenger cage, and the fall prevention rope drum prevents fall. When the rope is lifted up and down, the rope is taken up and unwound. In a fall prevention device of a rope type elevator for preventing the above, a ratchet pawl for engaging and stopping a ratchet wheel attached to the fall prevention rope drum is rotatably provided on a support base, and the ratchet wheel of the ratchet pawl is provided. The engaging side is connected to one end of a reciprocating connecting rod, and the anti-engaging side is provided with a spring for urging the ratchet wheel so as to engage with the ratchet wheel. The rope is connected to one end of the ratchet so as to release the engagement of the ratchet pawl, and the support base is provided with a restricting lock in which the connecting rod mounting end and the spring mounting end of the ratchet pawl are in contact. A fall prevention device for rope-type elevators characterized by.

〔Example〕

The structure of the present invention will be described in detail with reference to the first and second embodiments shown in the accompanying drawings.

FIG. 1 is an overall perspective view of the first embodiment of the present invention, FIG. 2 is a side view of a main portion of FIG. 1, FIG. 3 is a sectional view taken along the line AA of FIG. 2, and FIG. FIG. 3 is a sectional view taken along the line BB of FIG. 3, and FIG. 5 is a side view corresponding to FIG. 2 of the embodiment of FIG. 1, showing another embodiment of the present invention.

Both the first and second embodiments are suitable for a reactor cavity elevator used for inspection of a nuclear reactor.

First, the outline of the elevator of the first embodiment will be described. In FIG. 1 and FIG. 2, the riding cage 1 is suspended by two lifting wire ropes 2, 2. One end side of these lifting wire ropes 2 is connected via pulleys 3,3 attached to the upper surface of the passenger cage 1 and pulleys 4,4,5,5 provided above the highest position of the passenger cage 1. , Are respectively wound around two drums 6 and 6 arranged side by side on the same axis. The other end of the lifting wire rope 2 is fixed to levers 8 and 8 provided on the shaft of the pulley 5 via pulleys 7 and 7 provided near the pulley 4.

A drop-prevention wire rope 9 is provided in parallel between these two lifting wire ropes 2, 2. The drop-prevention wire rope 9 is hung on a pulley 10 attached to the upper surface of the riding cage 1, and one end thereof is fixed near the pulley 4. The other end is wound around a drop-prevention wire rope drum 12 via a pulley 11 provided near the pulley 4. A disc 13 is fixed to one end surface of the drop-prevention wire rope drum 12, and a winding drive drum 14 is integrally provided on the other side surface of the drop-prevention wire rope drum 12. A spring for urging the drum 12 in the rope winding direction is built in. Therefore, as the riding cage 1 moves up and down, the fall-prevention wire rope 1 is sent out from the fall-prevention wire rope drum 12 against this spring, and is wound by this spring force.

As shown in FIGS. 3 and 4, a pair of wedge-shaped holding pieces 15, 15 are provided facing each other on both sides of the flange 13a of the disk 13. The wedge-shaped holding pieces 15 are fixed to the wedge shafts 16, respectively. A pinion 17 is fixed to the wedge shaft 16, and the pinion 17 meshes with a rack 18. Therefore, the single rack 18 is engaged with the pair of pinions 17, 17 so as to be sandwiched between them. Also, connecting rods 19 and 19A are connected to both sides of the rack 18, one end side of one connecting rod 19 is slidably inserted into a bearing 21 fixed to a support 20, and the other connecting rod 19 is connected.
19A is slidably inserted in and supported by another bearing 22 fixed to the support base 20.

The end surface of the bearing 22 forms a receiving surface 22a, and one end surface of the spring case 23 and the left end of the spring (compression coil spring) 24 housed in the spring case 23 are in contact with the receiving surface 22a. It is touched. A nut 25 is fixed to the other end of the spring case 23, and the nut 25 is screwed into a screw 26 formed on the connecting rod 19A. Therefore, in the state where the pulling force to the left is applied to the connecting rod 19A, the spring 24 is bent (compressed), and the connecting rod 19A is locked to the support base 20 via the spring case 23. It is like this. The other end of the one connecting rod 19A is extended and connected to the lever 8.

Next, to describe the operation of the first embodiment, when the elevator is operating normally, the lifting wire ropes 2, 2 are wound up by the drums 6, 6 or unwound by the own weight of the riding case 1. Then, the riding case 1 moves up and down. At this time, by the pulling force of the lifting wire rope 2,
The lever 8 is always pulled to the left in FIGS. 1 and 2. As a result, the connecting rod 19A connected to the lever 8 is also pulled to the left via the nut 25 and the spring case 23 while compressing the spring 24. At this time, if the spring case 23 contacts the receiving surface 22a, the movement of the connecting rod 19A to the left is restricted. Therefore, since the rack 18 is in the position moved to the left,
The wedge-shaped holding pieces 15, 15 via the pinions 17, 17 rotate clockwise in FIG. 3 to form a gap 1 and do not hold the flange 13a. Therefore, wire rope drum for fall prevention
12 is free to reverse.

Next, when the lifting wire ropes 2, 2 are cut, the connecting rod 19A, which has been pulled to the left in FIGS. 1 and 2, until now, the spring case 23 and the nut are pulled by the extension action of the spring 24. It moves to the right in FIG. 3 via the screw 25 and the screw 26. As a result, the wedge-shaped holding pieces 15, 15 rotate counterclockwise in FIG. 3 to hold the flange 13a via the rack 18 and the pinions 17, 17. Therefore, the fall-prevention wire rope drum 12 is fixed, the lifting of the fall-prevention wire rope 9 is stopped, and the passenger cage 1 can be prevented from falling.

Next, a second embodiment of the present invention will be described. Referring to FIG. 5, a ratchet wheel 26 is fixed to one side surface of the wire rope drum 12 for preventing fall, and a ratchet pawl 27 is engaged with the ratchet wheel 26. It is supposed to meet. The ratchet claw 27 is a support base (support base of FIG. 2).
The ratchet pawl is connected at one end to a connecting rod 19 and at the other end to a spring (tensile coil spring) 29.
Further, the ratchet pawl 27 is provided with a cutout portion 27a, and the cutout portion 27a is brought into contact with the regulation block 30. The regulation block 30 is provided on the support base.

The spring 29 is connected to an adjusting rod 31, the adjusting rod 31 is inserted into a bearing stand 32, and a nut 33 is screwed to the outer end of the insert. Spring with this nut 33
The elasticity of 29 is adjusted.

In the second embodiment, during normal operation of the elevator, the ratchet pawl 27 contacts the restriction block 30 and restricts the connecting rod 19 from moving leftward in FIG. When the lifting wire rope 2 is cut, the elasticity of the spring 29 forces the ratchet pawl 27 to force the ratchet wheel 26.
To stop the rotation of the wire rope drum 12 for fall prevention. At this time, the restriction block 30 receives the impact force due to the stop applied to the ratchet pawl 27.

[Effect of device]

According to the first aspect of the present invention, in the first aspect, the connecting rod, which receives the pulling force from the lifting rope, is stopped by abutting the spring case integrated with the connecting rod to the support base. Also, in the second invention, the connecting rod that receives the pulling force from the lifting rope is stopped by the ratchet pawls coming into contact with the restriction block, so that the connecting rod is normally stopped during lifting. Good stability and no recoil when going up and down.

Therefore, even if the gap (l) between the flange and the wedge holding piece or the gap (l) between the ratchet pawl and the ratchet wheel is small, no trouble occurs.

Further, in the second invention, the impact force due to the sudden stop of the drop prevention rope drum is jointly supported by the ratchet pawl and the restriction block, and the ratchet pawl is not damaged.

[Brief description of drawings]

FIG. 1 is an overall perspective view of the first embodiment of the present invention, FIG. 2 is a side view of a main portion of FIG. 1, FIG. 3 is a sectional view taken along the line AA of FIG. 2, and FIG. FIG. 3 is a sectional view taken along the line BB of FIG. 3, and FIG. 5 is a side view corresponding to FIG. 2 of the embodiment of FIG. 1, showing another embodiment of the present invention. 1 ... Riding cage, 2 ... Lifting wire rope, 6 ...
… Drum, 9 …… fall prevention wire rope, 12 …… fall prevention wire rope drum, 13a …… flange, 15
...... Wedge-shaped clamp, 17 ...... pinion, 18 ...... rack,
19,19A …… Connecting rod, 24 …… Spring, 26 …… Ratchet wheel, 27 …… Ratchet claw, 29 …… Spring, 30 …… Regulator block.

Claims (2)

[Scope of utility model registration request] 1. An elevator comprising a lifting rope drum and a fall prevention rope drum, wherein the lifting rope drum winds and unwinds the lifting rope to raise and lower the riding cage, By the fall prevention rope drum, the fall prevention rope is wound up with the lifting rope,
In a fall prevention device for a rope-type elevator that prevents the passenger cage from falling by a fall prevention rope when rewinding or cutting the lifting rope, in order to clamp and stop the flange attached to the fall prevention rope drum One pair of wedge-shaped holding pieces are provided, and pinions are integrally provided on these wedge-shaped holding pieces, and one rack engaged with these pinions is urged to hold the wedge-shaped holding pieces. A coil spring is connected to one end of a reciprocally movable connecting rod that is fitted and fitted, and the other end of the connecting rod is connected to one end of the elevating rope by penetrating a supporting base to hold the wedge-shaped holding piece. And a connecting rod that engages the end of a spring case integrated with the connecting rod with the support base to interlock with the lifting rope. A rope type elevator fall prevention device characterized by stopping the movement of the rope. 2. An elevator equipped with an ascending / descending rope drum and a fall prevention rope drum, wherein the ascending / descending rope is wound up and rewound by the ascending / descending rope drum to elevate and lower a passenger cage, By the fall prevention rope drum, the fall prevention rope is wound up with the lifting rope,
A rope type elevator fall prevention device that prevents the passenger cage from falling by a fall prevention rope when rewinding or cutting the lifting rope, and stops by engaging with a ratchet wheel attached to the fall prevention rope drum. A ratchet pawl for causing the ratchet pawl to be rotatably provided on the support base, the ratchet wheel engaging side of the ratchet pawl is connected to one end of a reciprocating connecting rod, and the ratchet wheel is engaged on the anti-engaging side. A spring for urging the connecting rod, the other end of the connecting rod is connected to one end of the lifting rope to release the engagement of the ratchet pawl, and the support base is attached to the ratchet pawl connecting rod. A drop-prevention device for a rope-type elevator, characterized in that a regulating lock is provided in series so that the side end and the spring mounting side end contact each other. Place