JP2007217118A - Falling prevention device of lifting body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a falling prevention device of a lifting body capable of forcibly locking a hook to a rack disposed along the lifting direction of the lifting body by detecting the cutting of a wire rope for suspension and supporting by a variation in the tension of the wire rope and stopping the falling of the lifting body by stopping the lifting body while relieving the damping force of the lifting body by falling. <P>SOLUTION: This falling prevention device comprises the lifting body 1 suspended and supported by the wire rope 2, so as to be liftable the rack 7 disposed along the lifting direction of the lifting body 1, and the hook 4 projecting from the lifting body 1 by the detection of the variation in the tension of the wire rope 2 due to the cutting and locked with the rack 7 to stop the falling of the lifting body 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to an elevator body fall prevention device, and in particular, in a hoisting machine, an elevator, and the like that are suspended and supported so that the elevator body can be raised and lowered by a wire rope, the tension of the wire rope for hanging support is cut. The present invention relates to a device for preventing a fall of a lifting body that detects a change instantly and stops it while relaxing an impact force caused by the falling of the lifting body to prevent the fall.

  Conventionally, in hoisting machines, elevators, and the like configured to raise and lower a lifting body that is loaded with luggage or a person by winding and lowering a wire rope for supporting suspension, a sensor such as a limit switch is used to cut the wire rope. , The brakes installed on the lifting body side are actuated against the guide rails arranged along the lifting direction of the lifting body to prevent it from falling from both sides of the guide rail. To ensure safety.

  By the way, in the method of holding the guide rail and braking the dropping force of the lifting body, the braking frictional resistance of the braking device changes over time. In particular, if splash lubricant is applied between the guide rail and the braking device, the frictional resistance for braking decreases and the braking ability decreases, and the prescribed braking ability cannot be obtained. There was a problem that the ability decreased.

  In view of the problems of the conventional lifting body fall prevention device described above, the present invention detects the breakage of the suspension support wire rope from the change in its tension and arranges it along the lifting direction of the lifting body. An object of the present invention is to provide a lifting prevention device for a lifting body that forcibly locks a hook to the rack and stops the lifting body while preventing the falling force of the lifting body by stopping while relaxing the impact force caused by the falling of the lifting body. To do.

  In order to achieve the above object, an elevator body fall prevention device according to the present invention includes an elevator body that is suspended and supported by a wire rope so as to be able to be raised and lowered, and a rack that is disposed on a fixed side along the lifting direction of the elevator body. Further, the present invention is characterized in that it comprises a hook formed so as to detect a change in tension due to cutting of the wire rope or the like and to project from the lifting body and to be locked with a rack tooth to prevent the lifting body from falling.

  In this case, the rack can be supported so as to be movable in the vertical direction with respect to the fixed side within a range in which the impact force received when the lifting body is prevented from falling can be absorbed.

  Further, a shock absorber capable of absorbing an impact force due to a drop load of the lifting body can be disposed in the rack.

  In addition, when the hook is no longer subjected to the load due to the wire rope tension due to the wire rope being cut, the hook is pivotally attached to the lifting body so that the hook claw piece protrudes toward the rack by spring pressure. Can be configured.

  Further, when the lifting body load is supported on the hook by the wire rope, the stopper can be disposed so as to transmit the lifting body load to the lifting body side via the hook.

  According to the fall prevention device of the lifting body of the present invention, the lifting body that is suspended and supported by the wire rope, the rack disposed along the lifting direction of the lifting body, and the tension due to the wire rope cutting or the like The hook that protrudes by detecting the breakage of the wire rope by detecting the change and is constructed from the hook that is formed so as to protrude from the lifting body and lock with the rack to prevent the lifting body from falling. The lifting / lowering body can be reliably stopped by being locked with the rack disposed on the rack, and the fall can be prevented.

  Further, by supporting the rack so as to be movable in the vertical direction with respect to the fixed side within a range that can absorb the impact force received when preventing the lifting body from falling, a hook that protrudes when the wire rope is cut can be provided. Even if locked to the rack provided on the fixed side, the lifting body falls with the rack for a while, so that the impact load received when the lifting body is prevented from being absorbed is absorbed to reduce the impact force of the lifting body drop. can do.

  In addition, by installing a shock absorber in the rack that can absorb the impact force caused by the falling load of the lifting body, the impact force that is received when the lifting body is prevented from falling can be reliably reduced, and the lifting body can be dropped. By exchanging the shock absorber according to the load, it can be easily applied as appropriate from a heavy load lift to a light load lift.

  In addition, when the hook is no longer subjected to tension by cutting the wire rope, the hook rope is pivotally attached to the lifting body so that the hook claw piece protrudes toward the rack by spring pressure. Therefore, the lifting body can be prevented from dropping almost simultaneously with the cutting of the wire rope.

  In addition, when supporting the lifting body load on the hook with a wire rope, the lifting body load is supported by the stopper by arranging a stopper so that the lifting body load is transmitted to the lifting body side via the hook. It is possible to simplify and reduce the weight of the hook by making it so that the hook does not buckle and break with respect to the impact force caused by the hook and rack engaging in the initial fall of the lifting body. it can.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a lifting preventing apparatus for a lifting body according to the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of a fall prevention device for a lifting body according to the present invention.
In a hoisting machine, an elevator, a transporting machine, etc., by fastening the end of a wire rope 2 for suspension support that enables the lifting / lowering body 1 configured to mount a person or a transported item (luggage) to be wound up and down The suspension is supported and lifted and lowered by winding and lowering the wire rope, but the end of the wire rope 2 for suspension support is not directly fastened to the lifting body 1 but the shaft 3 The hook 4 is engaged with the hook 4 so as to be swingable via the hook 4, thereby supporting the entire load of the lifting body 1 via the hook 4.

Further, as shown in FIG. 1, the hook 4 is supported at the center portion so as to be swingable by a shaft 3 projecting from the lifting body side, and a claw piece 41 at the tip is formed into a hook shape, and is opposed to this. The end of the spring 5 attached to the lifting / lowering body side is locked to the base end side of the hook 7 so that the hook 4 swings around the shaft 3. When the hook 4 is normally suspended and supported by the wire rope 2, the wire rope suspension supporting force acts on the hook, and the spring 5 is brought into a tension state. A part of the hook is hooked with a stopper 6 projecting on the lifting body side so that a large load of the lifting body 1 can be suspended and supported via the stopper.
At this time, the spring 5 is in a tensioned state, but the load applied to the hook 4 beyond that is supported by the stopper 6.
As shown in FIG. 1, the wire rope 2 is locked to the hook 4 at an intermediate position between the shaft 3 that supports the hook 4 and the end portion on which the spring 5 is hooked. Is transmitted to the lifting body 1 via the hook 4 and the stopper 6.

  The rack 7 is arranged and fixed on the fixed side of the mast, wall surface, etc., and along the lifting direction of the lifting body, specifically facing the movement trajectory of the hook. A plurality of teeth 71 are formed in the rack body, and one or two or more long holes 72 in the vertical direction are formed in the rack body according to the length of the rack. The pins 8 projecting on the fixed side are fitted and inserted so that the rack 7 can move in the vertical direction with respect to the fixed side only by the distance that the pins 8 move in the long holes 72.

Further, the rack 7 is provided with a shock absorber 9 at a place other than the surface on which the teeth 71 are formed, for example, on the opposite side (back side) of the surface on which the teeth 71 are formed.
The shock absorber 9 has its main body disposed on the fixed side, and the shock absorber 10 receives a shock absorbing force due to a drop load of the lifting body 1 received by the rack 7 by fixing the tip of the shock absorber rod 10 protruding from the shock absorber main body to the rack 7. Make it possible to relax and prevent the lifting body from falling.

Next, the operation of the lifting / lowering body fall prevention device of the present invention will be described.
As shown in FIG. 1, the lifting body 1 is usually suspended and supported by a wire rope 2 and is lifted and lowered by winding and lowering the wire rope. The load applied to the lifting body 1 at this time is as follows. Suspended and supported by the wire rope 2 via the hook 4 and the stopper 6. In this case, the spring 5 stretched around the hook 4 is in a state of being stretched by the tension of the wire rope 2 that is larger than the tensile force of the spring. Even if facing the teeth 71, they are separated from each other, and the elevating body 1 moves up and down freely.

  When the wire rope 2 is cut due to material fatigue due to aging of the wire rope 2 or an overload applied to the wire rope 2, the tension of the wire rope 2 applied to the hook 4 instantaneously becomes zero. As a result, the hook is always subjected to the tensile force of the spring 5, and thus swings by the tensile force of the spring 5. When the proximal end side of the hook 4 is pulled by the spring tension force by the spring 5, the claw piece 41 at the distal end protrudes toward the rack side and engages (locks) with one tooth 71 of the rack 7. become. This state is shown in FIGS.

When the hook tip 41 is locked to one of the teeth 71 of the rack 7, the drop load of the elevating body 1 is applied to the rack 7 from the hook 4. As a result, both the lifting body 1 and the rack 7 begin to fall. However, since the rack 7 is fitted with the pin 8 projecting on the fixed side in the long hole 72, the rack 7 extends along the long hole direction. The rack 7 is vertically lowered, and the rack 7 is connected to the shock absorber 9 via the buffer rod 10, so that the falling load of the elevating body 1 is transmitted to the shock absorber 9 via the rack 7 and the buffer rod 10. . At this time, the falling load of the lifting body 1 is supported by the shock absorber 9, and the impact force due to the dropping of the lifting body 1 is absorbed and relaxed by the shock absorber 9 so that the lifting body 1 is prevented from falling. It becomes.
The length of the long hole 72 formed in the rack 7 is longer than the length required for the shock absorber 9 to support the impact force due to the drop load when the rack is dropped together with the lifting body 1. Also make it a little longer.

  As mentioned above, although the fall prevention apparatus of the raising / lowering body of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, The structure suitably in the range which does not deviate from the meaning. Can be changed.

  The lifting / lowering prevention device of the lifting / lowering body of the present invention has a characteristic that when the wire rope for hanging support is cut, the tension change is detected and the lifting / lowering body is instantaneously stopped to prevent the falling. Therefore, it can be suitably used for hoisting machines, elevators and the like, and can also be applied to a lifting and lowering transport machine.

It is explanatory drawing at the time of normal operation | movement which shows one Example of the fall prevention apparatus of the raising / lowering body of this invention. It is explanatory drawing immediately after the cutting | disconnection of a wire rope. It is explanatory drawing which shows the state which the hook latched by the rack by the cutting | disconnection of a wire rope. It is explanatory drawing which shows the state which the raising / lowering body stopped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lifting body 2 Wire rope 3 Axis 4 Hook 41 Claw piece 5 Spring 6 Stopper 7 Rack 71 Tooth 72 Long hole 8 Pin 9 Shock absorber 10 Buffer rod

Claims (5)

  A lifting body suspended and supported by a wire rope so that it can be lifted and lowered, a rack disposed along the lifting direction of the lifting body, a tension change caused by cutting of the wire rope, etc., is detected and protrudes from the lifting body. A lifting prevention device for a lifting body, characterized in that it comprises a hook formed to stop and prevent the lifting body from falling.   The falling of the lifting body according to claim 1, wherein the rack is supported so as to be movable in the vertical direction with respect to the fixed side within a range in which an impact force received when the falling of the lifting body is prevented can be absorbed. Prevention device.   The apparatus for preventing fall of a lifting body according to claim 1 or 2, wherein a shock absorber capable of absorbing an impact force due to a drop load of the lifting body is disposed in the rack.   The hook is pivotally attached to the lifting body so that the hook claw piece protrudes to the rack side by spring pressure when the hook is no longer subjected to the load due to the wire rope tension due to the wire rope cutting. The fall prevention device for a lifting body according to claim 1, 2, or 3.   5. A stopper is disposed so as to transmit the lifting / lowering body load to the lifting / lowering body side via the hook when the lifting / lowering body load is supported on the hook by the wire rope. The fall prevention apparatus of the lifting body as described.

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