JP2010208825A - Auxiliary brake device of passenger conveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an auxiliary brake of a passenger conveyor capable of imparting braking force corresponding to a passenger load, and capable of imparting proper braking force even when cutting off a driving force transmission chain. <P>SOLUTION: This auxiliary brake device includes a braking disc fixed to a sprocket 20 for transmitting driving force of a driving motor 21 via a driving force transmission chain 40 and rotating together with the sprocket 20, a braking shoe movably arranged to a braking position abutting on the braking disc and a non-braking position separated from the braking disc, a braking force adjusting part for adjusting the braking force for moving the braking shoe to the braking position from the non-braking position, a detecting part for detecting cutoff of the driving force transmission chain 40, a load calculating part for calculating a load quantity acting on the sprocket from a driving current of the driving motor 21, and a control part for reducing the braking force by operating the braking force adjusting part when the detecting part detects the cutoff of the driving force transmission chain 40 by adjusting the braking force by operating the breaking force adjusting part in response to the load quantity calculated by the load calculating part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an auxiliary brake device for a passenger conveyor, and in particular, in the case of an abnormality occurring in a circulating movement state of an endless conveyor chain that is circulated and connected with steps, a passenger conveyor that ensures the safety of a user. The present invention relates to an auxiliary brake device.

  In passenger conveyors such as escalators, a main frame called a truss is installed to incline across the upper and lower floors of the building, and two drive sprockets and two driven sprockets are on the same axis center on the upper and lower floors of the main frame. Is arranged. Between these sprockets, two conveyor chains positioned parallel to each other are spanned, and both ends of a plurality of steps are connected to the two conveyor chains.

  A drive unit having a motor, a speed reducer, etc. is disposed in the main frame on either the upper floor side or the lower floor side, and the drive force from the drive unit is transmitted to the drive sprocket via the drive force transmission chain. Thus, the drive sprocket is driven to rotate. When the drive sprocket is driven to rotate, the conveyor chain spanned between the driven sprocket circulates and the user on the step moves from the lower floor to the upper floor or from the upper floor. Carried to the lower floor.

  The passenger conveyor is provided with an auxiliary brake device that stops the rotation of the drive shaft of the driving unit of the passenger conveyor and stops the passenger conveyor in an emergency when an abnormality occurs such as a foreign object getting caught in the inlet part into which the handrail belt enters.

  In such an auxiliary brake device, if a constant braking force is generated regardless of the amount of load acting on the rotating shaft of the drive sprocket, a sudden brake is applied when the load is small, and the conveyor chain and the step are It will be suddenly stopped.

  Therefore, in the device that brakes the brake disk via the brake shoe attached to the brake lever by pinching the brake disk fixed to the drive shaft of the drive sprocket, the brake lever generates a pressing force by the spring force An auxiliary brake device that generates an appropriate braking force even under a passenger load condition that varies by providing a mechanism that adjusts the spring force with respect to increase or decrease of passengers is known (for example, Patent Document 1 below) reference).

JP-A-7-233822

  However, in the above-described conventional auxiliary brake device, the braking force to be applied to the brake disk is determined from the drive current of the drive motor that rotationally drives the sprocket, and therefore, for example, the moving speed of the step 12 is in an overspeed state. There is a possibility that the braking force cannot be determined accurately when the vehicle is in a certain state. In addition, when the driving force transmission chain is cut, the moment of inertia of the driving unit connected via the driving force transmission chain is not applied to the driving sprocket, and the load applied to the rotating shaft of the driving sprocket is drastically reduced. However, there is a problem that an appropriate braking force cannot be set for this sudden decrease in the load amount, and the deceleration during the operation of the auxiliary brake is increased, which causes discomfort to the passengers.

  The present invention has been made in consideration of the above problems, and can provide a braking force according to a load by a passenger and an auxiliary brake capable of providing an appropriate braking force even when the conveyor chain is cut. The purpose is to provide.

  An auxiliary brake of a passenger conveyor according to the present invention is fixed to a sprocket to which a driving force from a driving motor is transmitted via a driving force transmission chain, and is brought into contact with the braking disk that rotates with the sprocket and the braking disk. A braking shoe that is movably provided between a braking position and a non-braking position spaced apart from the braking disk, and a braking force that the braking shoe applies to the braking disk by moving the braking shoe from the non-braking position to the braking position. A braking force adjusting unit that adjusts the driving motor, a load calculating unit that detects a driving current of the driving motor, calculates a load amount acting on the sprocket from the detected value, and a rotation speed detection that detects the rotation speed of the braking disk And the braking force adjusting unit in response to the rotational speed detected by the rotational speed detecting unit and the load amount calculated by the load calculating unit. Characterized in that it comprises a control unit for adjusting the braking force applied to the brake disk.

  The auxiliary brake of another passenger conveyor according to the present invention is fixed to a sprocket to which driving force from a driving motor is transmitted through a driving force transmission chain, and rotates with the sprocket, and the braking disc. A brake shoe provided so as to be movable between an abutting braking position and a non-braking position separated from the braking disk, and the braking shoe is moved from the non-braking position to the braking position, and the braking shoe is moved to the braking disk. A braking force adjusting unit that adjusts the braking force to be applied, a detection unit that detects the breaking of the driving force transmission chain, and a driving current of the driving motor are detected, and a load amount acting on the sprocket is calculated from the detected value In response to the load calculated by the load calculating unit and the load calculating unit, the braking force adjusting unit is operated and applied to the braking disk. Adjust the power, the detection unit is characterized by comprising a control unit to reduce the braking force applied to the brake disc by operating the braking force adjustment unit and detects the disconnection of the driving force transmission chain.

  In the auxiliary brake of the passenger conveyor according to the present invention, an appropriate braking force can be applied by the above configuration.

It is a lineblock diagram showing a passenger conveyor to which an auxiliary brake concerning a 1st embodiment of the present invention was applied. FIG. 2 is a diagram schematically showing an auxiliary brake in FIG. 1. It is a figure showing roughly the auxiliary brake concerning a 2nd embodiment of the present invention. It is a figure which shows arrangement | positioning of the brake shoe of the auxiliary brake in FIG.

  A first embodiment of the present invention will be described below with reference to the drawings.

  An auxiliary brake device for a passenger conveyor according to an embodiment of the present invention is provided, for example, on an escalator that is installed to be inclined across the upper and lower floors of a building. As shown in FIG. 1, the passenger conveyor 10 circulates and moves a number of steps 12 between an upper floor entrance and a lower floor entrance and exits passengers on the step 12. It is transported across the floor and the lower floor.

  A number of steps 12 are connected by an endless conveyor chain 14 and are arranged in a main frame 16 called a truss installed under the floor of the building. A pair of balustrades 30 are erected on both sides of the upper portion of the main frame 16 along the moving direction of the step 12, and a belt-shaped moving handrail 32 is mounted around the balustrade 30.

  On the upper floor side inside the main frame 16, a rotating shaft 18, a pair of sprockets 20 connected to the rotating shaft 18, and a driving device 22 including a driving motor 21 and a speed reducer (not shown) are arranged. A rotating shaft 24 and a pair of sprockets 26 connected to the rotating shaft 24 are disposed on the lower floor side inside the main frame 16.

  A conveyor chain 14 is wound between the sprocket 20 on the upper floor side and the sprocket 26 on the lower floor side, and the conveyor chain 14 moves between the sprockets 20 and 26 as the sprockets 20 and 26 rotate. The step 12 is circulated and moved together with the conveyor chain 14.

  As shown in FIG. 2, both ends of the rotating shaft 18 are supported by bearings 28, and the bearings 28 are attached to the main frame 16. A pair of sprockets 20a and 20b are fixed to the outer peripheral surfaces at both ends of the rotating shaft 18, and a driving sprocket 34 is fixed to one of the sprockets 20a with a bolt or the like.

  A driving force transmission chain 40 is spanned between the driving sprocket 34 and a sprocket 38 a fixed to the driving shaft 38 of the driving device 22, and is provided to be rotatable integrally with the rotating shaft 18.

  The drive device 22 is driven and controlled by the control device 11 that controls the entire passenger conveyor 10, so that the drive force generated by the drive motor 21 is applied to the rotary shaft 18 via the drive force transmission chain 40 and the drive sprocket 34. The rotation shaft 18 and the sprockets 20a and 20b rotate integrally. Along with the rotation of the sprockets 20a and 20b, a driving force is transmitted to the conveyor chain 14 meshing with the sprockets 20a and 20b, so that a large number of steps 12 connected by the conveyor chain 14 are guided to guide rails (not shown). However, it is structured to circulate between the entrance / exit on the upper floor side and the entrance / exit on the lower floor side.

  As shown in FIG. 2, the auxiliary brake device 1 in the passenger conveyor 20 configured as described above has a braking disk 36, a pair of braking shoes 42 that applies a braking force to the braking disk 36, and a braking force that is applied to the braking disk 36. A pressurizing device 46 as a braking force adjusting unit to adjust, a detecting unit 48 for detecting the breaking of the driving force transmission chain, a load calculating unit 50 for calculating a load amount acting on the sprocket 20 on the upper floor, and a braking disk A rotation number detection unit 54 for detecting the rotation number 36 and a control unit 52 for driving and controlling the pressure device 46.

  The brake disk 36 has a disk shape, and is fixed to the other sprocket 20b facing the one sprocket 20a to which the driving sprocket 34 is fixed by a bolt or the like. Thereby, the brake disc 36 rotates integrally with the rotating shaft 18 and the sprockets 20a and 20b.

  The pair of brake shoes 42 are disposed to face both side surfaces of the brake disc 36 so as to be spaced apart from each other and sandwich the brake disc 36 therebetween. A fluid pressure cylinder 44 such as hydraulic pressure or pneumatic pressure is attached to the pair of brake shoes 42, and the fluid pressure of the working fluid supplied to the fluid pressure cylinder 44 by the pressurizing device 46 connected to the fluid pressure cylinder 44 is controlled. As a result, the pair of brake shoes 42 are relatively close to each other. As a result, the brake shoe 42 can move between a non-braking position separated from the braking disk 36 and a braking position that contacts the braking disk 36 and clamps the braking disk 36, and moves from the non-braking position to the braking position. Then, a braking force corresponding to the fluid pressure of the working fluid supplied from the pressurizing device 46 is applied to the braking disk 36.

  The detection unit 48 detects an abnormality in the circulating movement state of the conveyor chain 14, and inputs a stop signal to the control unit 52 when the abnormality is detected. Specifically, the detection unit 48 includes a means for detecting that the driving force transmission chain 40 is broken, a means for detecting that the moving speed of the step 12 is in an overspeed state, and the moving direction of the step 12 is reversed. A means for detecting the occurrence of the failure is included. When detecting that the driving force transmission chain 40 is broken, the detection unit 48 inputs a chain cutting signal as a stop signal to the control unit 52, and when detecting that the moving speed of the step 12 is in an overspeed state, When an overspeed signal is input to the control unit 52 and it is detected that the moving direction of the step 12 has been reversed, a reverse running signal is input to the control unit 52 as a stop signal.

  The load calculation unit 50 detects a current value flowing through the drive motor 21 and calculates a motor torque acting on the drive motor 21 from the detected value. The calculated motor torque corresponds to a load acting on the upper sprocket 20 connected to the drive motor 21 via the drive force transmission chain 40 and the drive sprocket 34. That is, the load calculation unit 50 calculates the amount of load that acts on the sprocket 20 on the upper floor side from the current value flowing through the drive motor 21. The load calculation unit 50 inputs the calculated load amount to the control unit 52.

  The rotational speed detection unit 54 includes, for example, a magnet 56 attached to a side surface of the brake disk 36 and a hall element 58 disposed so as to face the magnet 56, and the position of the magnet 56 is detected by the hall element 58 to thereby detect the brake disk 36. The number of rotations is detected. The rotation speed detection unit 54 inputs the detected rotation speed of the braking disk 36 to the control unit 52. The rotation speed detector 54 may be configured to detect the rotation speed of the brake disk 36 by measuring the rotation speed of the drive motor 21 and the sprocket 20 that rotate integrally with the brake disk 36.

  When a stop signal is input from the detection unit 48, the control unit 52 applies a braking force to the braking disk 36 from the braking shoe 42 by operating the pressurizing device 46.

  Specifically, in a state where the driving force transmission chain 40 is not cut and the driving device 22 and the sprocket 20 are connected via the driving force transmission chain 40, the conveyor chain 14 and the step 12 connected to the sprocket 20, etc. The resultant force of the load by the article of the passenger conveyor 10, the load by the user of the passenger conveyor 10, and the rotational resistance of the drive motor 21 and the reduction gear of the drive device 22 acts on the rotary shaft 18. This resultant force corresponds to the load amount input from the load calculation unit 50.

Therefore, when the overspeed signal and the reverse running signal are input from the detection unit 48, the control unit 52 goes back a predetermined time from the time when these signals are input from the detection unit 48 or the time when these signals are input. Based on the load amount input from the load calculation unit 50 and the rotation speed detection unit 54 at the time and the rotation speed of the braking disk 36, the braking force T applied to the braking disk 36 is calculated by the following equation (1).

In Equation 1, A _GD2 is the moment of inertia generated in the rotating shaft 18 by the load input from the load calculating unit 50, N is the number of revolutions of the brake disk 36, and t is the time until the brake disk 36 stops (ie, braking). Time).

  When the overspeed signal and the reverse running signal are input from the detection unit 48, the control unit 52 applies the braking disk 36 to the braking disk 36 according to the load amount input from the load calculation unit 50 so that the braking time becomes a predetermined constant value. The braking force T to be applied is adjusted.

  In the state where the driving force transmission chain 40 is cut, the rotational resistance of the driving motor 21 and the speed reducer (not shown) included in the driving device 22 does not act on the rotating shaft 18, but the load input from the load calculating unit 50. The amount is determined by the load of the passenger conveyor 10 such as the conveyor chain 14 and the step 12 connected to the sprocket 20, the load by the user of the passenger conveyor 10, the drive motor 21 and the speed reducer (not shown) included in the drive device 22. ) Rotation resistance value.

Therefore, when a chain cut signal is input from the detection unit 48, the control unit 52 calculates a load at a time when these signals are input from the detection unit 48 or a time that is a predetermined time after the time when these signals are input. Based on the load amount input from the unit 50 and the rotational speed detection unit 54 and the rotational speed of the braking disk 36, and the rotational resistance value of the drive motor 21 and the speed reducer that the driving device 22 has in advance, the braking disk 36. The braking force T applied to is calculated by the following equation 2.

In Equation 2, A _GD2 is the moment of inertia of the rotating shaft 18, B _GD2 is the moment of inertia generated in the rotating shaft 18 due to the rotational resistance values of the drive motor 21 and the speed reducer included in the driving device 22, and N is the number of rotations of the braking disk 36. , T is a time until the brake disk 36 stops (that is, a braking time).

  The control unit 52 subtracts the rotational resistance values of the drive motor 21 and the speed reducer of the drive device 22 from the load amount input from the load calculation unit 50 so that the braking time becomes a predetermined constant value. The braking force T to be applied is adjusted. That is, when a chain cut signal is input from the detection unit 48, the braking force T applied to the brake disk 36 is reduced as compared with the case where another stop signal is input.

  Then, the control unit 52 drives and controls the pressurizing device 46 to apply the braking force T calculated as described above to the braking disk 36 from the braking shoe 42, whereby the rotation of the sprocket 20 is stopped, and the conveyor chain The circulation movement between 14 and the step 12 is stopped.

  As described above, in the auxiliary brake according to the present embodiment, when the detection unit 48 detects an abnormality in the circulating movement state of the conveyor chain 9, the brake shoe 42 sandwiches the brake disk 36, thereby causing the conveyor chain 14 and the step 12. And the conveyor chain 14 and the step 12 can be prevented from running away toward the lower floor.

  Further, in the auxiliary brake in the present embodiment, the brake disc 36 is driven by the brake shoe 42 in accordance with the load amount of the user of the passenger conveyor 10 detected by the load calculation unit 50 so that the braking time becomes a predetermined constant value. Since the control unit 52 adjusts the braking force T applied to the conveyor belt 14, the conveyor chain 14 and the step 12 can be gently stopped without suddenly stopping, and the passenger conveyor 10 can be stopped appropriately and safely.

  In addition, in a state where the driving force transmission chain 40 is cut, the control unit 52 subtracts the rotational resistance value of the drive motor 21 and the speed reducer included in the drive device 22 from the amount of load input from the load calculation unit 50, thereby reducing the braking disk. Since the braking force T applied to 36 is adjusted, an appropriate braking force can be applied even when the driving force transmission chain 40 is cut.

  In the above-described embodiment, the rotational speed of the braking disk 36 is detected by the rotational speed detection unit 54, and the load amount input from the load calculation unit 50 and the rotation of the braking disk 36 input from the rotational speed detection unit 54 are detected. The braking force T to be applied to the braking disk 36 is determined based on the number, but for example, the rotational speed N of the braking disk 36 is applied to the braking disk 36 as a predetermined constant without providing the rotational speed detection unit 54. The braking force T to be used may be determined, whereby the configuration of the auxiliary brake can be simplified.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same structure as the structure demonstrated in above-mentioned 1st Embodiment, and the overlapping description is abbreviate | omitted.

  The second embodiment is different from the first embodiment described above in that the braking force adjusting unit that adjusts the braking force applied by the braking shoe 42 to the braking disk 36 causes the braking shoe 42 to be moved by the magnetic attraction force. This is a point that is a shoe moving unit 60 that moves from the non-braking position to the braking position.

  Specifically, a plurality of braking shoes 42 are arranged at predetermined intervals in the circumferential direction of the braking disk 36, and a shoe moving portion 60 is provided in each of the plurality of braking shoes 42. As a result, the plurality of braking shoes 42 individually move between the non-braking position and the braking position.

  The shoe moving part 60 is a so-called non-excitation operation type electromagnetic brake in which the braking shoe 42 moves from the braking position to the non-braking position by a magnetic attraction force, and includes an electromagnet 62, a movable iron core 64 fixed to the braking shoe 42, And a spring 66 that presses the shoe 42 against the brake disc 36. When the electromagnet 62 is energized, the shoe moving part 60 magnetically attracts the movable iron core 64 so as to separate the brake shoe 42 from the brake disk 36 against the urging force of the spring 66, and when the electromagnet 62 is deenergized, the spring moves. The brake shoe 42 is pressed against the brake disk 36 by the urging force of 66. That is, when the electromagnet 62 is energized, the braking shoe 42 moves to the non-braking position, and when the electromagnet 62 is not energized, the braking shoe 42 moves to the braking position and the braking shoe 42 applies a braking force to the braking disk 36. . In the present embodiment, the number of braking shoes 42 moved from the non-braking position to the braking position is increased or decreased to adjust the braking force applied to the braking disk 36.

  In the present embodiment, the control unit 52 stops the energization of the electromagnet 62 and moves it from the non-braking position to the braking position from the braking force T applied to the braking disk 36 calculated by the above formula 1 or formula 2. The number of brake shoes 42 is determined. Then, the control unit 52 causes the determined number of shoe moving units 60 to stop energizing the electromagnets 62 included in the shoe moving unit 60 to move the determined number of braking shoes 42 from the non-braking position to the braking position. And a predetermined amount of braking force T is applied to the braking disk 36.

  As described above, in the present embodiment, the braking force applied to the braking disk 36 can be adjusted with a simple configuration such as increasing or decreasing the number of braking shoes 42 to be moved from the non-braking position to the braking position, and the auxiliary brake can be reduced in size. Can be

DESCRIPTION OF SYMBOLS 10 ... Passenger conveyor 11 ... Control apparatus 12 ... Step 14 ... Conveyor chain 18 ... Rotating shaft 20 ... Sprocket 21 ... Drive motor 22 ... Drive device 24 ... Rotating shaft 26 ... Sprocket 34 ... Drive sprocket 36 ... Braking disc 38 ... Drive shaft DESCRIPTION OF SYMBOLS 40 ... Driving force transmission chain 42 ... Brake shoe 44 ... Fluid pressure cylinder 46 ... Pressurizing device 48 ... Detection part 50 ... Load calculation part 52 ... Control part 54 ... Rotation speed detection part

Claims (5)

A braking disk fixed to a sprocket to which driving force from a driving motor is transmitted via a driving force transmission chain, and rotating together with the sprocket;
A braking shoe provided movably between a braking position abutting on the braking disk and a non-braking position spaced apart from the braking disk;
A braking force adjusting unit that moves the braking shoe from a non-braking position to a braking position and adjusts a braking force that the braking shoe applies to the braking disk;
A load calculation unit for detecting a drive current of the drive motor and calculating a load amount acting on the sprocket from the detected value;
A rotational speed detection unit for detecting the rotational speed of the brake disc;
In response to the rotational speed detected by the rotational speed detector and the load amount calculated by the load calculator, a controller that operates the braking force adjuster to adjust the braking force applied to the braking disk; An auxiliary brake for a passenger conveyor, comprising: A braking disk fixed to a sprocket to which driving force from a driving motor is transmitted via a driving force transmission chain, and rotating together with the sprocket;
A braking shoe provided movably between a braking position abutting on the braking disk and a non-braking position spaced apart from the braking disk;
A braking force adjusting unit that moves the braking shoe from a non-braking position to a braking position and adjusts a braking force that the braking shoe applies to the braking disk;
A detection unit for detecting the cutting of the driving force transmission chain;
A load calculation unit for detecting a drive current of the drive motor and calculating a load amount acting on the sprocket from the detected value;
In response to the load amount calculated by the load calculation unit, the braking force adjusting unit is operated to adjust the braking force applied to the braking disk, and when the detection unit detects the break of the driving force transmission chain, An auxiliary brake for a passenger conveyor, comprising: a control unit that operates a braking force adjusting unit to reduce a braking force applied to the braking disk. A rotation speed detection unit for detecting the rotation speed of the brake disc;
In response to the rotational speed detected by the rotational speed detection unit and the load amount calculated by the load calculation unit, the control unit adjusts the braking force applied to the braking disk by operating the braking force adjustment unit. The auxiliary brake for a passenger conveyor according to claim 2.   The braking force adjusting unit includes a pressurizing device that applies a fluid pressure to the braking shoe to move the braking shoe from a non-braking position to a braking position, and increases or decreases a fluid pressure applied to the braking shoe. The auxiliary brake for a passenger conveyor according to any one of claims 1 to 3, wherein a braking force applied to the disc is adjusted. With multiple braking shoes,
The braking force adjusting unit includes a shoe moving unit that moves a plurality of the braking shoes between a non-braking position and a braking position by a magnetic attraction force, and increases or decreases the number of the braking shoes that are moved to the braking position. The auxiliary brake for a passenger conveyor according to any one of claims 1 to 3, wherein a braking force applied to the braking disk is adjusted.

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