JP4209251B2 - Elevator emergency stop device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an emergency stop device for an elevator.
[0002]
[Prior art]
In conventional elevator safety devices, the governor detects the overspeed of the car and mechanically grabs the governor rope using the centrifugal force generated in the sheave of the governor. The emergency stop device was operated via a connecting mechanism and a pull-up lever. As a problem in the mechanism of the emergency stop device, when the connecting mechanism vibrates up and down due to a car swaying or the like, the emergency stop device may malfunction.
As an example of the malfunction prevention mechanism of the emergency stop device, a cam is formed on the shaft side end of the pulling lever, and a curved surface seat is formed on the contact surface of the coil spring of the malfunction prevention means with the cam. There is one that allows the brake to move upward when the tensile force exceeds a predetermined value (for example, see Patent Document 1).
In addition, as a mechanism for preventing malfunction of other emergency stop devices, there is a malfunction prevention stopper that restricts the upward rotation of the operating lever, and this malfunction prevention stopper can be adjusted in its vertical position. (For example, see Patent Document 2)
[0003]
[Patent Document 1]
JP-A-5-319724 (FIG. 1)
[0004]
[Patent Document 2]
JP-A-57-170371 (Claims 3 and 4)
[0005]
[Problems to be solved by the invention]
In the conventional elevator emergency stop device malfunction prevention mechanism, since the stopper is not provided directly per rail of the emergency stop device, if the connecting mechanism vibrates up and down due to the passenger's car shaking, etc. There is a problem that it is unavoidable that malfunctions occur.
[0006]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an emergency emergency device that prevents the emergency stop from malfunctioning even when the coupling mechanism vibrates up and down due to the car's swaying or the like. A stop device is provided.
[0007]
[Means for Solving the Problems]
The elevator emergency stop device according to the present invention is provided on the lifting body and is pressed against the guide rail via the biasing body when the brake is displaced upward by the tension of the governor rope during operation of the governor. in performs an emergency stop of the lift by Rukoto provided to the lifting member, a malfunction prevention locking apparatus to prevent the normal time lowered position near Ru system Doko is displaced upward, provided governor And an operation switch that is mechanically interrupted by the centrifugal force of the governor sheave in the event of an emergency and releases the brake blocker operation by the locking device for malfunction prevention. The malfunction prevention locking device is normally energized. In an emergency, there is an electromagnet that is cut off, and a magnetic body that opposes the electromagnet. When the electromagnet is energized, the magnetic body is attracted and lowered, and the lower end is near the top of the brake and the brake is Prevent upward displacement A stopper that is intended to include a coil spring for biasing the stopper always upward.
[0008]
Further, the malfunction prevention locking apparatus is in the normal energization state, emergency is an electromagnet mounted on the fixed part as a cut-off state, descends upon energization of the electromagnet and the counter magnetic body is provided to the electromagnet A movable body, a rod-shaped stopper that is connected to the movable body and penetrates a through-hole formed in the fixed portion and has a lower end near the top of the brake element and prevents the brake element from being displaced upward; It includes a coil spring wound around the stopper and interposed between the lower surface of the movable body and the periphery of the through hole of the fixed portion, and constantly biases the stopper in the upward direction .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 is a perspective view showing the overall configuration of an elevator safety device according to Embodiment 1 of the present invention. FIGS. 2 and 3 are enlarged side views showing the configuration of the main part of the safety device. FIG. FIG. 3 shows an emergency state. In FIG. 1, a car 1 as an elevator lift is suspended by one end of a main rope (not shown) wound around a hoisting machine (not shown) provided in a machine room (not shown). It is lifted and lowered in the hoistway by driving a hoisting machine together with a counterweight (not shown) which is another lifting body that is held by the other end of the main rope. An emergency stop device 2 is provided at the bottom of the car 1. A speed governor 5 provided in the machine room is driven by a speed governor rope 4 connected to the emergency stop device 2 by a connection mechanism 3. A governor tensioning wheel 6 is attached to the suspended lower end of the governor rope 4. Therefore, the governor rope 4 is driven at the same speed as the car 1. The car 1 is supported between a pair of guide rails 7 erected on the hoistway via guide shoes (not shown).
A frame body 8 of the safety device 2 is attached to the lower part of the car 1, and a pinching body 9 as a pair of urging bodies facing the guide rail 7 with a predetermined distance is disposed in the frame body 8. Has been. Further, it is disposed so as to be positioned on both sides of the guide rail 7 in the frame body 8, has a wedge shape having a gradient on the side opposite to the guide rail, and is provided on the emergency stop device 2 side of the coupling mechanism 3. There is provided 10 per rail which is a brake that moves upward as the lever rotates. This rail contact (braking element) 10 is normally held at the lowered position as shown in FIG. 2, and in an emergency, it moves upward as shown in FIG. Then, intervening between the guide rail 7 and the pinching body 9, the rail per 10 is pressed by the guide rail 7, the braking force due to the friction between the guide rail 7 and the rail per 10 is generated, The car 1 is brought to an emergency stop.
[0010]
An upper horizontal frame 11 of the frame 8 of the emergency stop device 2 attached to the lower portion of the car 1 is provided with a lock device 12 that contacts the top of the rail 10 and prevents malfunction of the emergency stop device 2. Yes. The locking device 12 includes an electromagnet 13 mounted on the upper horizontal frame 11 of the frame body 8, a moving body 15 in which a magnetic body 14 facing the electromagnet 13 is provided on the lower surface of one end, and the moving body 15 A rod-like stopper 17 connected to the lower surface of the other end portion and inserted through a through-hole 16 formed in the upper horizontal frame 11, wound around the stopper 17, and the lower surface of the other end portion of the movable body 15 and the upper lateral frame. A compression coil spring 18 is interposed between the peripheral edge of the through hole 16 of the frame 11 and constantly biases the stopper 17 in the upward direction.
[0011]
In the normal state, as shown in FIG. 2, the emergency stop device 2 has 10 per rail at the lowered position and is not in contact with the guide rail 7. At this time, the electromagnet 13 of the locking device 12 is in an energized state (ON), the magnetic body 14 is attracted to the electromagnet 13, and the moving body 15 and the stopper 17 are pulled down against the urging force of the compression coil spring 18, and the stopper The lower end of 17 is in contact with or close to the top of 10 per rail to prevent 10 per rail from rising.
When the car 1 exceeds 1.3 times the rated speed regardless of the vertical direction, the governor 5 operates as an overspeed switch as a first step and turns off the elevator. Next, when the car 1 further overspeeds for some reason and enters a second stage exceeding 1.4 times the rated speed, the electromagnet 13 of the locking device 12 is caused by the centrifugal force generated in the sheave of the governor 5. The switch 19 of the power source connected to is mechanically cut off. As shown in FIG. 1, the switch 19 on / off signal is sent from the control panel 20 to the emergency stop device 2 of the car 1 via the control cable 21 and is directly supplied to the electromagnet 13 of the lock device 12. Sent to. When the switch 19 is turned off and the power supply to the electromagnet 13 is cut off (OFF), the stopper 17 of the locking device 12 is pushed up by the urging force of the compression coil spring 18 in the upward direction, and the top 10 locks per rail are locked. Is released. On the other hand, the rail per 10 lifted by the governor 5 via the connecting mechanism 3 and the pulling lever rises without being blocked by the stopper 17 and is engaged with the guide rail 7 as shown in FIG. The emergency stop device 2 is activated to stop the car 1.
When the operation of the car 1 is resumed, if the switch 19 is turned on and the car 1 is moved upward with the power to the electromagnet 13 turned on, the stopper 17 of the locking device 12 is simultaneously moved to the rail. Since the hit 10 is pushed down, the emergency stop device 2 can be easily returned.
[0012]
In the elevator emergency stop device constructed in this way, even if the coupling mechanism vibrates up and down due to the influence of the car's swaying, etc. Therefore, the problem that the emergency stop device malfunctions is eliminated.
[0013]
Embodiment 2.
In the first embodiment, after the operation of the first stage in which the overspeed switch of the governor is operated, the car 1 is further abnormally overspeeded and enters the second stage exceeding 1.4 times the rated speed. The power switch 19 connected to the electromagnet 13 of the lock device 12 is mechanically cut off by the centrifugal force generated in the sheave of the governor 5. As the switch 19 of the power source connected to the electromagnet 13 of the locking device 12, an overspeed switch of the governor 5 that operates in the first stage exceeding 1.3 times the rated speed is used in combination.
[0014]
According to the second embodiment, since the overspeed switch of the governor 5 that operates at the first stage exceeding 1.3 times the rated speed is used in combination, the dedicated switch is used as a switch for the electromagnet power source of the lock device. Since there is no need to add a special stop and the block against the top per rail can be released early, the emergency stop device does not cause a delay in operation.
[0015]
Embodiment 3.
In the first and second embodiments, the case where the emergency stop device 2 is attached to the elevator car 1 side, that is, the emergency stop in the descending direction of the car 1 has been described, but on the counterweight side as well as the car side. Of course, it is possible to apply an emergency stop in the upward direction of the car 1 by attaching a speed governor and an emergency stop device having the same configuration.
[0016]
【The invention's effect】
As the invention has been described above, provided to the lifting member, a malfunction prevention locking apparatus to prevent the normal time lowered position near Ru system Doko is displaced upwards, adjusted to emergency provided governor It is mechanically interrupted by the centrifugal force of the speed sheave and is equipped with an operation switch that releases the blocking action of the brake by the locking device for malfunction prevention. The malfunction prevention locking device is normally energized and is Sometimes an electromagnet that is in a cut-off state and a magnetic body that opposes the electromagnet are attracted and lowered when the electromagnet is energized, and the lower end is near the top of the brake element, and the brake element is displaced upward. Because it includes a stopper that prevents this and a coil spring that constantly urges this stopper in the upward direction, the coupling mechanism vibrates up and down due to the effect of the car's shaking, etc. If you try Also, since the motion is suppressed by the stopper malfunction prevention locking apparatus, a problem is eliminated safety device to malfunction.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall configuration of an elevator safety device according to Embodiment 1 of the present invention.
FIG. 2 is an enlarged side view in a normal state showing the main configuration of the safety device according to Embodiment 1 of the present invention.
FIG. 3 is an enlarged side view in an emergency state showing a configuration of main parts of the safety device according to Embodiment 1 of the present invention.
[Explanation of symbols]
1 Car (elevating body)
2 Emergency stop device 3 Coupling mechanism 4 Speed governor rope 5 Speed governor 6 Speed governor tension wheel 7 Guide rail 8 Frame body 9 Nipping body (biasing body)
10 per rail (brake)
DESCRIPTION OF SYMBOLS 11 Upper horizontal frame 12 Locking device 13 Electromagnet 14 Magnetic body 15 Moving body 16 Through-hole 17 Stopper 18 Compression coil spring 19 Switch 20 Control panel 21 Control cable

Claims (5)

Elevator that is provided on the lifting body and performs emergency stop of the lifting body by being pressed against the guide rail via the biasing body when the brake is displaced upward by the tension of the governor rope during the operation of the governor In the emergency stop device of
A locking device for preventing malfunction , which is provided in the lifting body and prevents the brake element in the normally lowered position from being displaced upward; and centrifugal force of a sheave of the governor provided in the governor in an emergency. An actuating switch that is mechanically interrupted by and releases the blocking action of the braking element by the malfunction preventing locking device,
The locking device for preventing malfunction is normally energized and has an electromagnet that is cut off in an emergency, and a magnetic body facing the electromagnet, and the magnetic body is attracted and lowered when the electromagnet is energized. An emergency stop for an elevator comprising: a stopper having a lower end near the top of the brake element and preventing the brake element from being displaced upward; and a coil spring that constantly biases the stopper in the upward direction. apparatus. Elevator that is provided on the lifting body and performs emergency stop of the lifting body by being pressed against the guide rail via the biasing body when the brake is displaced upward by the tension of the governor rope during the operation of the governor In the emergency stop device of
A locking device for preventing malfunction, which is provided in the lifting body and prevents the brake element in the normally lowered position from being displaced upward; and centrifugal force of a sheave of the governor provided in the governor in an emergency. An actuating switch that is mechanically interrupted by and releases the blocking action of the braking element by the malfunction preventing locking device,
The locking device for preventing malfunction is normally energized, and is provided with an electromagnet mounted on a fixed portion that is cut off in an emergency, and a magnetic body facing the electromagnet, and is lowered when the electromagnet is energized. A movable body, and a rod-shaped stopper connected to the movable body and penetrating through a through-hole formed in the fixed portion and having a lower end portion in the vicinity of the top of the brake element and preventing the brake element from being displaced upward An elevator emergency comprising: a coil spring wound around the stopper and interposed between the lower surface of the movable body and the periphery of the through hole of the fixed portion, and constantly biasing the stopper in the upward direction. Stop device. The elevator emergency stop device according to claim 1 or 2, wherein the operation switch is mechanically interrupted when the lifting body exceeds 1.4 times the rated speed. As actuation switch, the lifting body according to claim 1 or claim 2, wherein in that a combination of overspeed switch mechanically blocked by the speed governor operates when exceeded 1.3 times the rated speed Elevator emergency stop device. The elevator emergency stop according to any one of claims 1 to 4 , wherein the elevator is a car and a counterweight, and both the car and the counterweight are provided with an emergency stop mechanism. apparatus.

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