JPH0811671B2 - Elevator safety equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a safety device at the upper and lower ends of an elevator hoistway, and is particularly suitable for an elevator that does not have a main rope or a governor rope between a car and a hoistway. It concerns safety devices.

[Conventional technology]

Most conventional elevators are a rope traction type elevator in which a car and a counterweight are connected by a main rope through a hoisting machine, and a hydraulic elevator that raises and lowers a car with a hydraulic jack. There has been proposed an elevator (hereinafter referred to as a linear elevator) of a type that directly raises and lowers a car as a drive source without interposing a main rope or a hydraulic jack between the car and the hoistway.
In this elevator, the traveling cable is omitted and signals are sent and received between the car side and the hoistway side by wireless communication, and the governor rope is omitted and another mechanical braking device that replaces the governor device is installed in the car. Due to
It is possible to eliminate mechanical inclusions between the car and the hoistway. If there are no mechanical inclusions, it will be extremely suitable for super high-rise and ultra-high-rise buildings with long up and down strokes,
Furthermore, it is easy not only to raise and lower the car in the straight hoistway, but also to circulate the car in the annular hoistway.

However, the safety device used for this linear elevator has not yet been fully developed.

[Problems to be Solved by the Invention]

The upper and lower ends of the hoistway of conventional elevators, such as rope traction elevators, are equipped with limit switches to prevent the car from overshooting.When this limit switch is activated, the hoist is electrically braked. The car is stopped by operating the brake or mechanically stopping the hoisting machine. However, when using a linear elevator, for example, a ground primary type linear motor with a primary coil on the hoistway side and a secondary conductor on the car side, there is no hoisting machine and Instead of stopping, the braking device mounted on the car is operated and the power supply to the primary coil is stopped. At this time, the operation signal of the limit switch of the hoistway is wirelessly transmitted to the car to operate the car braking device.However, if an abnormality occurs in the wireless device, the hoistway side There is a problem that the car cannot be mechanically braked even if the power supply to the primary coil can be stopped. It is also conceivable to provide a limit switch on the car side instead of the hoistway, and to operate the car braking device and stop the power supply to the hoistway side primary coil by operating this limit switch. If an abnormality occurs in the system, the car braking system can be activated, but the power supply to the primary coil on the hoistway cannot be stopped.
It is not possible to stop the car reliably.

The present invention has been made in view of the above points, and an object thereof is to improve safety at the upper and lower ends of a hoistway of a linear elevator.

[Means for solving the problem]

The present invention provides limit switches on both the upper and lower ends of a hoistway and a car so that the car can be mechanically and electrically braked regardless of whether or not there is an abnormality in the radio device. By using
The brake device can be reliably operated.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall schematic view, FIG. 2 is a detailed view of an essential part of FIG. 1, and FIG. 3 is a plan view of FIG.

In the figure, 1 is a hoistway formed in an annular shape, 2a and 2b are top clearances of the hoistway, 3a and 3b are pits, 4a and 4b are oil buffers, and 5a to 5f are two-story elevator cars. 1 is operated so as to circulate in the direction of the arrow, that is, in the clockwise direction. The cage 5g shows the case of an abnormality. 6 is a standby hatch for keeping the car 5 (any one of 5a to 5g) on standby at the time of an outage, 7 is a repair hatch for repairing a broken car of the car 5, 8 is a hydraulic jack, 9a, 9
b is a maintenance rescue exit leading to the pits 3a and 3b, 10 is a stairway leading to the maintenance rescue exits 9a and 9b, 11 is a moving vehicle that moves the car 5 from left to right in FIG. 1, and 11a is inside the moving vehicle 11. A stop switch that is installed to forcibly stop the car 5 in the moving vehicle 5, and 12 normally moves the car 5 from right to left, and when necessary, moves to the standby hatch 6 or repair hatch 7 side. Reference numeral 12a is a stop switch installed in the moving vehicle 12 for moving the vehicle 5. 14a and 14b are limit switches installed in the top clearances 2a and 2b, and 15a and 15b are limit switches installed in the pits 3a and 3b, which are operated by cams (not shown) of the car 5, respectively. In this embodiment, since the ground primary type linear motor is adopted, a superconducting coil is mounted on the car 5 side, and the ground primary coil is divided into a plurality and installed on the hoistway side. 16 is a primary coil,
Reference numeral 17 is a control device for controlling each primary coil 16.

Reference numeral 20 is a superconducting coil installed in the car 5 so as to face the primary coil 16 at a predetermined interval (about 100 mm), 21 is a car door, and 22 is a hall door provided in the hall 40 on each floor. 23 is a rack provided on the car 5 so as to be able to move back and forth, 24 is a rack provided on the hoistway 1, and is provided at a position facing the car side rack 23 when the car 5 is landed on the floor. There is. The car side rack 23 is in a retracted position while the car 5 is traveling, and when the car 5 is landed on the floor, it moves forward,
It engages with the hoistway side rack 24 and holds the stopped position of the car 5. 25 is a safety rail that is installed over the entire length of the hoistway 1 in the vertical direction, 26 is a cage 5 that is provided on the car 5 and holds the safety rail 25 when an abnormality occurs.
27 is also a safety for preventing overdescent. 28 is a limit switch for raising provided on the car 5, and when the car 5 rises excessively, it is operated by a cam (not shown) provided on the top clearances 2a and 2b, and the safety 26 grips the safety rail 25. It is carried out and the excessive rise of the car 5 is prevented. 29 is also a limit switch for lowering, and when the car 5 is excessively lowered, it is operated by a cam (not shown) in the pits 3a, 3b to cause the safety 27 to grip the safety rail 25, and the car 5 It prevents excessive decline. Reference numeral 30 is a guide roller for preventing the car 5 from colliding with the wall surface of the hoistway 1, and in a normal state, the roller 30 is provided with a clearance of about 30 mm from the top surface of the safety rail 25. . Reference numeral 31 is also a guide roller, and 32 is a roller rail installed at a position facing the guide roller 31 over the entire length of the hoistway 1 in the vertical direction. The rail 5 protrudes toward the car 5 near the position where the car 5 is landed on the level. , The guide roller 31 is in contact with the guide roller 31, and prevents the car 5 from shifting in the front-rear direction (left-right direction in FIG. 3) during level landing, that is, fluctuations in the gap between the car 5 and the landing 40. ing. In places other than this, from the guide roller 31
It is installed so as to keep a gap of about 30 mm.

With the above configuration, the car 5 stops at each landing 40,
Circulation operation is performed in the hoistway 1.

If for some reason the car 5 (in this case, the car 5g) drops abnormally and falls into the pit 3b, the limit switch 29 of the car 5 operates and the safety 27 grips the rail 25. At the same time, the limit switch 15b in the pit 3b operates to excite the primary coil 16 in the pit 3b with direct current,
The car 5 is electrically braked.

In this way, the limit switch 29 of the car 5 and the pit
Since the limit switch 15b in 3b operates independently,
Even if an abnormality occurs in the wireless device between the car 5 and the hoistway 1, it is possible to reliably operate both.
Even if one of the limit switches does not operate normally, if the wireless device is normal, the limit switch operating signal of the normally operated side is transmitted to the other, so that both the car 5 and the pit 3b side are transmitted. The braking device can be activated.

As described above, according to this embodiment, when the limit switches 29 and 15b for the car and the hoistway are normal and there is an abnormality in the wireless device, and when the wireless device is normal, either the car or the hoistway. It is possible to deal with the case where one of the limit switches has an abnormality.

The above description has described the case where the car 5 has dropped into the pit 3b, but the same applies when it has dropped into the pit 3b and when it has risen excessively into the top clearances 2a and 2b.

Since the safety 26, 27 in this embodiment is a normal gripping device composed of a spring and an electromagnetic solenoid, both the safety 26, 27 can be operated when the car 5 is excessively raised or lowered. In addition to this, a wedge type may be used for the safety 27 as used in a governor device. In this case, the safety 26 can be operated when the car 5 is excessively raised, and both the safetys 26 and 27 can be operated when the car 5 is excessively lowered. In addition to the above, if you are a person who can grip the safety rail 25, safety 2
It can be used as 6,27.

Further, in the above embodiment, the hoistway side limit switch 14
Since a and 15a and 14b and 15b are not on the same vertical line,
Although the cam on the side of the car 5 is also installed in each, the limit switches may be arranged so as to be repeated on the same vertical line, and one cam on the side of the car 5 may be provided.

Further, the above-described embodiment can be applied not only to the method of circulating the car in the annular hoistway but also to the method of hoisting the car in the normal linear hoistway. Further, not only the linear elevator but also other types of elevators such as rope traction type and hydraulic type can be applied.

〔The invention's effect〕

As described above, according to the present invention, it is possible to provide an elevator safety device that is suitable for a linear elevator and can be applied to elevators of other types such as a rope traction type.

[Brief description of drawings]

FIG. 1 is an overall schematic view showing an embodiment of the present invention, FIG. 2 is a detailed view of an essential part of FIG. 1, and FIG. 3 is a plan view of FIG. 1 …… hoistway 2a, 2b …… top clearance 3a, 3b …… pit 5a-5g …… car 11,12 …… moving vehicle 14a, 14b …… housing upper limit switch 15a, 15b …… housing side lower limit Switch 25 …… Safety rail 26 …… Safety for preventing excessive car rise 27 …… Safety for preventing excessive car fall 28 …… Limit switch for raising the car side 29 …… Limit switch for lowering the car side

Claims (1)

[Claims] 1. A hoistway-side limit switch provided on the upper and lower parts of an elevator hoistway and operated by a cam provided on a car, and a car provided on a car and operated by cams provided on the upper and lower parts of the hoistway. Side limit switch, a braking device that operates by at least one of the limit switch operation signals to brake the car from the hoistway side, and a braking device that operates by at least one of the limit switch operation signals and brakes the car from the car side A safety device for an elevator, comprising: a braking device for controlling a car side limit switch; and a communication device for transmitting an operation signal of the car side limit switch to the hoistway side and a communication device for transmitting an operation signal of the hoistway side limit switch to the car side.