JPH0136869Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an emergency braking device for a passenger conveyor.

Passenger conveyors are equipped with emergency braking devices to avoid danger to passengers.

First, a conventional emergency braking device will be explained with reference to FIGS. 1 and 2. In the figure, 1 is the main body of the passenger conveyor, 2 is the drive machine provided inside the passenger conveyor main body 1, 8 is the electric motor, 4 is the brake provided on the shaft of the electric motor, and 5 is the speed governor attached to the electric motor. It is a machine. 6 is a drive chain wrapped around the driving machine 2 and the drive chain wheel 7, 8 is a tread chain wheel provided coaxially with the drive chain wheel 7, and 9 is wrapped around this to connect the tread plate 10.
An endless tread chain connected to 11
1 is a ratchet wheel that is in contact with the side of one treadle chain wheel 8;
Reference numeral 2 designates an arm that engages with the pawl of ratchet wheel 11, and reference numeral 13 designates a lever having a shoe 14 attached coaxially with this arm and abutting drive chain 6.

Here, if the electric motor 8 is out of phase, the driving torque is insufficient, and the passenger load causes the passenger conveyor to accelerate and descend. However, the speed governor 5 installed coaxially with the electric motor 3 When the brake 4 is detected to be higher than the rated value, the brake 4 is activated to stop the passenger conveyor. When the drive chain 6 breaks, the lever 13 with the shoe 14 in contact with the drive chain 6 falls and rotates, and the arm 12 attached coaxially with this lever 13 rotates and engages the pawl of the ratchet wheel 11. When engaged, the upper tread chain wheel can be stopped, and the tread chain wrapped around the upper tread chain wheel and the tread plate connected to the tread chain can be stopped.

However, if the power transmission member such as the gear of the drive machine 2 is damaged, or if the brake 3 attached to the motor shaft does not work for some reason,
Due to the weight of the passengers, the passenger conveyor that is running upwards will cause a reverse movement, and the passenger conveyor that is running downwards will be accelerated and the moving speed of the tread will increase, which is very dangerous.

This invention aims to eliminate the above-mentioned drawbacks and provides an emergency braking device that can reliably stop the passenger conveyor in the event of a phase loss in the electric motor, damage to the power transmission member, or the like.

In order to achieve the above object, this invention uses a ratchet wheel placed in contact with the side of a treadle chain wheel attached to the main shaft, and an electromagnetic coil and a spring placed close to the ratchet wheel. a main shaft brake consisting of an arm that is removably operated with the pawl of the ratchet wheel;
a first rotating body that is rotatably mounted on the main shaft;
a second rotating body rotatably attached to a bearing fixed to a bracket of the passenger conveyor body and increasing the rotational speed of the first rotating body; and a second rotating body coaxially mounted with the second rotating body. A disk is placed close to the disk, and detects whether the rotation speed of the disk is above the rated value or below the rated value, and outputs an output signal if the rotation speed is above the rated value or below the rated value. and first and second detectors that emit the above-mentioned power, and the power to the motor and the electromagnetic coil is cut off based on the output signals of these detectors, and the motor is stopped and the electromagnetic coil is deenergized. The arm and ratchet wheel are engaged to apply braking to the main shaft.

According to the emergency braking device for a passenger conveyor according to this invention, when the motor becomes less than the rated speed due to an open phase etc. and the rotational speed of the main shaft becomes less than the rated value, the first rotating body attached to the main shaft Detecting the rotational speed of the disc via a second rotating body by a detector disposed close to a disk rotating together with the second rotating body,
When this detected value becomes less than the rated value, the power is cut off by an output signal. Therefore, when the electromagnetic coil is deenergized, the arm is rotated by the force of the spring and locked with the ratchet wheel, causing the main shaft to move and stopping the passenger conveyor.

In addition, when the rotation speed of the disk exceeds the rated value, this is detected by a detector installed near the disk that detects the rotation speed above the rated value, and the power is cut off. Emergency braking similar to the above can be performed.

Further, the second rotating body includes a first
Because the disc is configured to increase the rotational speed of the rotating body, the rotational speed of the disc is increased compared to the rotational speed of the main shaft, and the detector that detects this responds quickly. For all conveyor accidents,
Able to respond quickly and reliably.

Hereinafter, the emergency braking device for a passenger conveyor according to this invention will be explained in detail with reference to the drawings.

3 and 4 are side views of essential parts showing an embodiment of the emergency braking system for a passenger conveyor according to this invention, and the same reference numerals as in FIG. 2 indicate the same parts.
In the figure, reference numeral 15 denotes an arm corresponding to the arm 12 in FIG. 2, which is rotatably attached to a bracket 16 fixed to the passenger conveyor body by a pin 17. Reference numeral 18 denotes an electromagnetic coil for moving the arm 15, and a plunger 19 of the electromagnetic coil 18 is attached to the arm 15 by a pin 20. 21 is a spring that applies a load that causes the arm 15 to engage with the pawl of the ratchet wheel 11 when the electromagnetic coil 18 is de-energized; 22 is a chain wheel that is a first rotating body coaxially attached to the drive chain wheel 7; 23 is chain wheel 2
2 and the chain wheel 22 have fewer teeth than the chain wheel 22.
This is a chain wheel which is a second rotating body around which a chain 25 is wrapped so that it rotates at a higher speed. 26 is chain wheel 2
A plurality of weights 23 are attached to the disk 26, which is pulled toward the center by a spring 27. Reference numeral 29 is a detector having a claw that collides with the weight 28 and falls down when the weight 28 overcomes the spring force of the spring 27 by rotational centrifugal force and moves toward the outer circumference of the disk. The power is cut off when the claw falls. 30 is a U-shaped pulse detector mounted across the disc 26 to detect irregularities on the disc 26, and is designed to cut off the power when the number of pulses falls below a specified value. ing.

That is, when the speed of the motor drops below the rated speed due to an open phase or the like, the rotational speed of the disc 26 that rotates via the drive chain 6 and the chain 25 becomes below the rated speed, and when the rotation speed falls below the preset specified pulse, the power is cut off. Then, the electromagnetic coil 18 is deenergized, and the force of the spring 21 causes the arm 15 to rotate and engage the ratchet wheel 11 to stop the passenger conveyor.

Also, when the drive chain 6 breaks, if it occurs during upward operation, the disc 26
If the number of revolutions of the passenger conveyor falls below the rated value and the passenger conveyor is stopped by the same operation as described above, and this occurs during descending operation, the treadle 10 and the treadle chain 9 will be accelerated by the weight of the passengers and fall. Therefore, the treadle chain wheel 8 rotates more than its rated value, and the disc 26 connected thereto via the chain 25 rotates more than its rated value.
When the disc 26 rotates beyond its rated value, the weight 28 attached to the disc 26 overcomes the spring force of the spring 27 and is pushed out in the circumferential direction, causing the detector 2 with its claws to
By colliding with 9 and knocking down the claw, the power is cut off. When the power is cut off, the passenger conveyor is stopped in the same way as above.

Next, if the gears etc. of the drive machine 2 were damaged, conventionally the conveyor could not be stopped, but since the power of the electric motor 3 is not transmitted to the tread chain wheel 7 via the drive chain 6, In any case during operation, the passenger conveyor can be reliably stopped by the same operation as described above. Chain wheel 23 on the disc 26 side
By reducing the number of teeth and increasing the speed of the main shaft, centrifugal force can be applied more easily and the number of pulses can be increased, making detection easier.

In addition, in Fig. 3, a chain 25 is wound between the chain wheel 22 and the chain wheel 23, which are mounted coaxially with the tread chain wheel 8, but the same effect can be obtained even if this is replaced with a pulley or a V-belt. The gains are obvious.

Also, a weight 2 that operates when the disk 26 is accelerated
Instead of installing a detector 29 that operates when the weight 8 and the weight 28 move in the outer circumferential direction, a U-shaped pulse detector installed across the disk to detect the unevenness of the disk 26 detects the number of pulses. It is also clear that the effect of the detector 29 can be obtained by cutting off the power even when the value exceeds a specified value.

As explained above, this invention consists of a main shaft brake consisting of a treadle chain wheel attached to the main shaft, a pawl of a ratchet wheel coaxially arranged, an arm removably operated by an electromagnetic coil and a spring, and A disk that rotates at an increased speed by increasing the rotation speed, and a disk that is placed close to this disk, and whether the rotation speed of the disk is higher than the rated value or not.
Each of the detectors is equipped with a detector that detects whether it is below the rated value, and the output signals from these detectors are used to cut off the power to the motor and electromagnetic coil and activate the main shaft brake, so the passenger conveyor This system will reliably respond to accidents caused by operation below the rated speed due to phase loss in the motor, breakage of the drive chain during ascending and descending operations, and damage to drive gears, etc. It has the excellent effect of being able to stop the passenger conveyor by stopping the passenger conveyor, and that it is easy to detect because the detector detects the rotation speed of the disc which is increased by the rotation speed from the main shaft. have

[Brief explanation of drawings]

Figure 1 is a side view of essential parts showing an example of a conventional emergency braking device for a passenger conveyor, Figure 2 is an enlarged view of the upper tread chain wheel shown in Figure 1, and Figure 3 is an emergency brake system for a passenger conveyor according to this invention. FIG. 4 is a side view of a main part showing one embodiment of the braking device, and FIG. 4 is a cross-sectional view taken at - in FIG. 6... Drive chain, 7... Drive chain wheel, 8... Step board,
9...Tread chain, 11...Rawl wheel, 15...Arm,
16... Bracket, 17... Pin, 18... Electromagnetic coil, 19... Plunger, 20... Pin, 21... Spring, 22... Chain wheel, 23... Chain wheel, 25... Chain, 26... ...Disk, 27...Spring,
28...chain, 29...detector, 30...pulse detector. Note that the same or corresponding parts in the figures are indicated by the same reference numerals.

Claims (1)

[Scope of utility model registration request] A ratchet wheel is placed in contact with the side surface of the treadle chain wheel attached to the main shaft, and the ratchet wheel is placed close to the ratchet wheel and is operated by an electromagnetic coil and a spring so as to be able to engage and detach from the pawl of the ratchet wheel. a main shaft brake consisting of an arm; a first rotating body that is rotatably mounted on the main shaft; and a first rotating body that is rotatably attached to a bearing fixed to a bracket of the passenger conveyor main body, a second rotating body that increases the speed of the second rotating body;
A disc is mounted coaxially with the rotating body, and a disc is placed close to this disc. It detects whether the rotation speed of each disc is above the rated value or below the rated value. It is equipped with first and second detectors that respectively issue output signals if the output signal is above or below, and the output signals of these detectors cut off the power to the motor and the electromagnetic coil, stopping the motor and the electromagnetic coil. An emergency braking device for a passenger conveyor, characterized in that the coil is deenergized and the arm and ratchet wheel are engaged to apply braking to the main shaft.