JP2005219843A - Braking device of escalator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a braking device of an escalator capable of preventing free movement of the escalator due to reduction of braking force. <P>SOLUTION: This braking device of the escalator is provided with a brake drum 13 connected with a rotary shaft 7a of a motor 7 and a brake arm 14 provided rotatably in the direction in which it comes into contact with and leaves an outer peripheral face of the brake drum 13 using one end part 14a as the center of rotation. In the brake arm 14, a brake arm 19 is brought into pressure-contact with the outer peripheral face of the brake drum 13 through a brake shoe 15 by a pressing pin 16 and a torque spring 17 and is moved in the direction in which it leaves the outer peripheral face of the brake drum 13 by a pushing-up bolt 21 of an electromagnetic coil 22. A stroke sensor 24 for detecting travel distance of the pressing pin 16 is provided in an upper part of the pressing pin 16 to detect braking force based on a signal detected by the stroke sensor 24. When the detected value becomes abnormal, a stop signal of the escalator is outputted to a safety circuit 26. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

 The present invention relates to an escalator brake device capable of stopping an escalator when an abnormality occurs by detecting a magnitude of a braking force of a motor that drives a step.

 In an escalator, a large number of steps connected endlessly are circulated by being guided by guide rails that are inclined between the upper and lower floors, so that passengers move on the steps. ing. Guide rails for guiding the steps are provided on the main frame, and a pair of balustrades are installed on both sides of the steps in the width direction. Each of the pair of balustrades is provided with a handrail belt that moves in the same direction at the same speed as the steps, and the handrail belt and the steps described above are driven by a driving device disposed in the upper floor machine room of the main frame. It is like that.

 The drive device includes a motor and a speed reducer, transmits the power of the motor to the drive sprocket via the drive chain, and rotationally drives the step chain wound around the drive sprocket so as to be connected to the step chain. Is designed to circulate. The drive device is driven and controlled by the control device. The brake device provided in the motor of the drive device is connected to a brake drum coaxially with the rotation shaft of the motor, and a brake arm having a brake shoe attached to the inside is rotatably provided on the outer peripheral surface side of the brake drum. It has been configured. The brake arm is always pressed by the torque spring and the brake shoe is in pressure contact with the outer peripheral surface of the brake drum to apply the brake, and the control device controls the drive to release the brake arm from the brake drum. The rotation of the motor is controlled.

 However, if the rotational movement distance of the brake arm is increased due to wear of the brake shoe or the like, the elongation of the torque spring that generates the braking force on the brake arm increases, and the desired braking force cannot be obtained. There is a possibility that a phenomenon occurs in which the brake is not applied to the motor, and the step of the escalator starts to move downward due to its own load.

 Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide an escalator braking device that can prevent the escalator from moving freely due to a decrease in braking force.

  In order to solve the above-mentioned problems, an escalator brake device according to the present invention is installed so as to be rotatable in a direction in which the brake drum is connected to the rotating shaft of the motor and is in contact with or separated from the outer peripheral surface of the brake drum with one end as a rotation center. Brake arm, a brake shoe provided inside the brake arm, contacting and separating from the outer peripheral surface of the brake drum, and a pressure for pressing the brake arm in a direction to contact the outer peripheral surface of the brake drum via the brake shoe A pin, a torque spring that constantly applies a pressing force to the pressing pin to apply a braking force to the brake drum by a brake, and a push-up bolt that moves the brake arm away from the brake drum based on a signal from the control device Detects the moving distance of the driving electromagnetic coil and the pressing pin or torque spring And Torokusensa, a detection circuit for detecting the magnitude of the braking force based on a signal from the stroke sensor, characterized by comprising a safety circuit for stopping the escalator on the basis of a signal from the detection circuit.

  In this case, display means for displaying the magnitude of the braking force can be provided in the detection circuit.

 According to the present invention, the rotational movement distance of the brake arm becomes longer due to wear of the brake shoe, etc., and even if the braking force is reduced by the torque spring, an abnormality is detected by the stroke sensor and the escalator is stopped. Movement can be prevented.

  FIG. 1 is an overall configuration diagram of an escalator showing an embodiment of the present invention, FIG. 2 is an enlarged plan view of a drive device shown in FIG. 1, FIG. 3 is an enlarged front view of a brake device shown in FIG. It is a schematic block diagram of a sensor.

 In FIG. 1, an escalator is used in which a number of steps 1 connected endlessly are circulated and guided by guide rails (not shown) provided between the upper and lower floors 2 and 3. The customer moves on the step 1. A guide rail for guiding the step 1 is provided on the main frame 4, and a pair of balustrades 5 are installed on both sides of the step 1 in the width direction. Each of the pair of balustrades 5 is provided with a handrail belt (not shown) that moves in the same direction at the same speed as the step 1. The handrail belt and the above step 1 are provided in the upper floor machine room of the main frame 4. It is driven by a driving device 6 arranged in 4a. As shown in FIG. 2, the drive device 6 includes a motor 7, a transmission joint 8, and a speed reducer 9, and transmits the power of the motor 7 to a drive sprocket (not shown) via the drive chain 10. A number of steps connected to the step chain are circulated and driven by rotationally driving the wound step chain.

  The drive device 6 is driven and controlled by the control device 11 and is started by releasing the braking of the brake device 12 provided in the motor 7. As shown in FIG. 3, the brake device 12 includes a brake drum 13 connected to the rotation shaft 7 a of the motor 7. A brake arm 14 is provided so as to be rotatable in a direction in which the brake drum 13 contacts and separates from the outer peripheral surface. The brake arm 14 has one end portion 14a rotatably supported on the outer peripheral portion of the motor 7. The brake arm 14 can rotate in a direction in which the one end portion 14a is in contact with and separated from the outer peripheral surface of the brake drum 13 with the one end portion 14a as a rotation center. ing. A brake shoe 15 that contacts and separates from the outer peripheral surface of the brake drum 13 is provided inside the brake arm 14.

  On the other end side of the brake arm 14, a pressing pin 16 and a torque spring 17 are provided to press the brake arm 14 in a direction to contact the outer peripheral surface of the brake drum 13 via the brake shoe 15. The pressing pin 16 and the torque spring 17 are accommodated in the cylinder 18, and the torque spring 17 is restricted in its upward movement by a stopper 18 a provided in the upper part of the cylinder 18. They are arranged so as to be movable up and down and pressed downward by the repulsive force of the torque spring 17.

  Therefore, the pressing pin 16 is held in a state in which a pressing force is constantly applied to the brake arm 14 and a braking force is applied via the brake shoe 15. The cylinder 18 has a structure in which a support frame 19 fixed to the motor 7 is screwed through and fixed by a torque adjusting nut 20, and the mounting position can be adjusted for torque adjustment.

 A push-up bolt 21 is provided at a position facing the pressing pin 16 across the brake arm 14. The push-up bolt 21 is driven upward by an electromagnetic coil 22 controlled based on a signal from the control device, and the brake arm 14 is pushed up and moved away from the outer peripheral surface of the brake drum 13. ing. The brake arm 14 is pushed up until it comes into contact with the lower end of the cylinder 17.

 The electromagnetic coil 22 that drives the push-up bolt 21 is also fixedly supported on the support frame 19. Further, a nut 23 that can adjust the length of the push-up bolt 21 is screwed to the tip of the push-up bolt 21.

 On the other hand, a variable resistance type stroke sensor 24 for detecting the distance of the vertical movement of the pressing pin 16 is provided in the upper part of the cylinder 18. As shown in FIG. 4, the stroke sensor 24 includes a resistor 24a, and a constant voltage is applied to both ends of the stroke sensor 24 from a battery 24b. The movable electrode 24c that slides on the resistor 24a is connected to the pressing pin 16, and can move in response to the pressing pin 16. As a result, a voltage having a magnitude corresponding to the moving distance of the pressing pin 16 is output between the movable electrode 21c and the cylinder 18, and this output voltage indicates the magnitude of the braking force. To the detection circuit 25 shown in FIG. A safety circuit 26 that stops the escalator based on a signal from the detection circuit 25 is connected to the detection circuit 25.

 Therefore, if the rotational movement distance (counterclockwise rotation) of the brake arm 14 increases due to wear of the brake shoe 15 and the like, and the movement distance of the pressing pin 16 (downward movement) increases accordingly, the pressing pin 16 The torque spring 17 giving the pressing force extends beyond the set value and causes a reduction in the pressing force. However, the detection circuit 25 detects that the detected value (the magnitude of the braking force) exceeds a preset limit value. If it is determined that the braking force is reduced, a stop signal is output to the safety circuit 26 to stop the escalator. Thereby, it is possible to prevent the escalator from moving freely due to a decrease in braking force.

  In this case, the movable electrode 24c of the stroke sensor 24 may be connected to the lower end of the torque spring 17 via a connecting means such as a rod, and the extension (movement distance) of the torque spring 17 may be directly detected.

  Further, a display means for displaying the magnitude of the braking force in real time can be provided in the detection circuit 25 so that it can be monitored in the monitoring room.

  In the above embodiment, the case where the brake arm is provided on one side of the brake drum has been described. However, the case where the brake arm is provided on both sides of the brake drum can also be implemented in the same manner.

It is a whole block diagram of the escalator which shows one embodiment of this invention. FIG. 2 is an enlarged plan view of the drive device shown in FIG. 1. FIG. 3 is an enlarged front view of the brake device shown in FIG. It is a schematic block diagram of a stroke sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Steps 2 and 3 ... Upper and lower floors 4 ... Main frame 4a ... Upper floor machine room 5 ... Railing 6 ... Driving device 7 ... Motor 7a ... Rotating shaft 8 ... Transmission joint 9 ... Reduction gear 10 ... Drive chain 11 ... Control Device 12 ... Brake device 13 ... Brake drum 14 ... Brake arm 14a ... One end 15 ... Brake shoe 16 ... Pressing pin 17 ... Torque spring 18 ... Cylinder 18a ... Stopper 19 ... Support frame 21 ... Push-up bolt 22 ... Electromagnetic coil 23 ... Nut 24 ... Stroke sensor 24a ... Resistor 24b ... Battery 24c ... Movable electrode 25 ... Detection circuit 26 ... Safety circuit

Claims (2)

  A brake drum connected to the rotating shaft of the motor, a brake arm installed so as to be rotatable in a direction contacting and separating from the outer peripheral surface of the brake drum with one end portion as a rotation center, and provided inside the brake arm, A brake shoe that contacts and separates from the outer peripheral surface of the brake drum, a pressing pin that presses the brake arm in a direction to contact the outer peripheral surface of the brake drum via the brake shoe, and a pressing force is constantly applied to the pressing pin to A torque spring that applies a braking force to the brake drum via the brake shoe, an electromagnetic coil that drives a push-up bolt that moves the brake arm away from the brake drum based on a signal from a control device, and A stroke sensor that detects the travel distance of the pressing pin or torque spring, and this stroke A detection circuit for detecting the magnitude of the braking force based on a signal from Kusensa, escalator brake system comprising and a safety circuit for stopping the escalator on the basis of a signal from the detection circuit.  The escalator brake device according to claim 1, wherein the detection circuit is provided with display means for displaying a magnitude of a braking force.

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