CN115611109A

CN115611109A - Anti-lock braking system (ABS) control system of elevator brake

Info

Publication number: CN115611109A
Application number: CN202211384282.0A
Authority: CN
Inventors: 芮振璞
Original assignee: Anhui Changli Mona Drive Technology Co ltd
Current assignee: Anhui Changli Mona Drive Technology Co ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-01-17

Abstract

The invention relates to an anti-lock braking system (ABS) control system of an elevator brake, which comprises two functions of emergency braking and manual brake releasing. When the elevator needs emergency braking under special conditions, the braking force of the elevator brake can be changed by starting an anti-lock braking system (ABS) braking mode so as to prolong the braking distance, reduce the deceleration and realize reliable dynamic braking, so that the elevator car can be prevented from being out of control or suddenly stopped, the danger caused by the emergency braking of the elevator under special conditions is greatly reduced, and the safety of elevator taking personnel is ensured; secondly when the power grid is down or the elevator breaks down and is shut down abnormally, and manual brake release is needed, a safe and reliable brake release measure can be provided, unsafe factors caused by the problems of corrosion or resistance increase and the like of a traditional manual remote brake release mechanism are eliminated, the safety of elevator control work is improved, and the elevator control system has remarkable technical and practical advantages.

Description

Anti-lock braking system (ABS) control system of elevator brake

Technical Field

The invention relates to the technical field of elevator brakes, in particular to an anti-lock braking system (ABS) of an elevator brake.

Background

The improvement of national economic strength further promotes the development and popularization of elevator technology. Straight elevators, escalators, villa elevators, sightseeing elevators, travelators, etc., which are driven by traction machines are increasingly used, but the brakes, which are the first important safety components of elevators, have not been significantly improved. One of the main drawbacks of elevator brakes is that the braking force is not variable, and the operating mode of the brake has only two states: the brake force is maximum when the brake is released, and the brake force is zero when the brake is released. The reason for this is that the designer only considers that the elevator is a zero-speed band brake, i.e. static braking, and does not consider emergency braking, i.e. dynamic braking, when the elevator fails. Therefore, the emergency braking device can cause injury to the elevator passengers when the elevator is subjected to special conditions and needs emergency braking.

In the case of a vertical elevator, the maximum braking force instantaneously applied during emergency braking causes sudden elevator stopping, resulting in excessive deceleration and injury to passengers, particularly in the case of a high-speed elevator. For escalators and moving walkways where the load varies greatly, emergency braking is more difficult to control than for straight ladders. Especially, when the escalator runs down, emergency braking is the most dangerous, and people taking the escalator will fall down and roll down from the escalator.

In addition, when the elevator cannot level due to power failure of a power grid or abnormal stop of the elevator caused by self fault, the rescue workers can utilize manual remote brake release to control the elevator to level so as to rescue trapped passengers. However, the remote brake release mechanism often has the problems of corrosion or resistance increase of a mechanical transmission mechanism due to long-term shelf, and the dangerous situation that the brake cannot be released again after the brake is released may occur, so that secondary damage is brought to elevator taking personnel. Secondly, there is still the problem that manual brake release can not accurate control car moving speed.

In summary, one of the problems is how to change the braking force of the elevator brake when the elevator has special situations and needs emergency braking, so as to prolong the braking distance, reduce the deceleration and realize reliable dynamic braking; and secondly, when the power grid is in power failure or the elevator is in fault and is abnormally shut down and needs to be manually released, a safe and reliable brake releasing measure is provided. The solution of the two problems has important practical significance in the aspect of safety guarantee.

Disclosure of Invention

The object of the invention is to achieve dynamic braking of an elevator by changing the braking force of the elevator brake. Similar to an ABS system of an automobile, the braking mode is a inching braking mode which is realized by controlling a left braking part and a right braking part of a tractor brake to alternately hold a brake and release the brake, namely an anti-lock braking mode. The braking mode can prolong the braking distance of the elevator car, so that the car is gradually decelerated to achieve safe braking. Elevator manufacturing and installation safety code 12.4.2.1 specifies: "when the car is loaded with 125% of the rated load and is moving downward at the rated speed, the brake should be operated to stop the traction machine. In such a case, the deceleration of the car should not exceed the deceleration caused by the safety gear action or the car hitting the buffer. This means that the deceleration of the conventional brake during emergency braking when the elevator is running is no better than when the car hits the buffer.

Elevator manufacturing and installation safety code 12.4.2.1 also specifies: all the brake mechanical components involved in applying a braking force to the brake wheel or disc should be installed in (at least) two groups. If one of the components is not functioning, there should still be sufficient braking force to decelerate a car carrying a rated load descending at a rated speed. Based on the standard, the invention enables two groups of braking components to alternately execute contracting brake and releasing brake, thereby not only reducing the original braking force of the brake, but also ensuring enough braking force to decelerate the elevator car. The time for the conventional brakes (lever, direct-pressure drum brake and axial disc brake) to complete one brake-contracting and brake-releasing cycle is about 0.4s, so that when the brakes are divided into two groups to work alternately, the brake frequency of about 5 times/s can be realized. For the caliper disc brake, since the number of the brake members is two or more, the number of the groups can be appropriately increased to three or four groups according to the magnitude of the braking force of each brake member.

The control system can be used for (lever, direct-pressure) drum brakes, axial disc brakes and caliper disc brakes; the control system is suitable for various carrying devices such as elevators, escalators, moving sidewalks and the like.

In order to realize the purpose of the invention, the adopted technical scheme is as follows:

an anti-lock braking system (ABS) control system of an elevator brake comprises an emergency rescue/reset circuit, wherein two ends of the emergency rescue/reset circuit are connected with a brake circuit power supply in series, and the negative electrode of the brake circuit power supply is also connected with the negative electrode of a backup power supply; the emergency rescue/reset circuit comprises a normally closed contact, a contact switch KR1-1 controlled by a KR1 relay and connected with the positive electrode of a band-type brake circuit power supply, a normally open contact of the contact switch KR1-1 is connected with the positive electrode of a backup power supply and the input end of the relay KR1, a movable contact of the contact switch KR1-1 is connected with a movable contact of a contact switch KR1-2 controlled by the KR1 relay, a normally open contact of the contact switch KR1-2 is connected with the input end of the relay KR2, and the relay KR2 is connected with a switch power supply in parallel; two ends of the switch power supply are simultaneously connected in parallel with the acousto-optic alarm circuit, the delay circuit, the pulse generator, the counting frequency divider and the multi-path driver; the output end of the multi-path driver is simultaneously connected with the grids of a power switch MOSFET1 and a power switch MOSFET2 in series, the drain output end of the power switch MOSFET1 is connected with a normally open contact of a contact switch KR2-1 controlled by a relay KR2, the source output end is connected with the negative pole of a band-type brake circuit power supply and is simultaneously connected with a normally closed contact of the contact switch KR2-1, the drain output end of the power switch MOSFET2 is connected with a normally open contact of the contact switch KR2-2 controlled by the relay KR2, and the source output end is connected with the negative pole of the band-type brake circuit power supply and is simultaneously connected with a normally closed contact of the contact switch KR 2-2; the movable contacts of the contact switch KR2-1 and the contact switch KR2-2 are simultaneously connected to the output terminal of the brake, and the simultaneous input terminals of the brake are connected to the movable contacts of the contact switch KR1-1 and the contact switch KR 1-2.

Preferably, the output end of the relay KR1 is simultaneously connected with the input end of the self-locking circuit and the input end of the emergency stop/rescue button, the output end of the self-locking circuit is connected with the input end of the reset button, and the output end of the reset button and the output end of the emergency stop/rescue button are simultaneously connected with the negative electrode of the contracting brake circuit power supply.

Preferably, the output end of the relay KR2 is connected with the switching power supply and is also connected with the negative electrode of the internal contracting brake circuit power supply.

Preferably, the brake comprises two groups of brake coils, the input ends of the two groups of brake coils are simultaneously connected with the movable contact of the contact switch KR1-1 and the movable contact of the contact switch KR1-2, the output end of one group of brake coils in the brake is connected with the movable contact of the contact switch KR2-1, and the output end of the other group of brake coils is connected with the movable contact of the contact switch KR 2-2.

Preferably, the switching power supply provides +15V working voltage for the acousto-optic alarm circuit, the delay circuit, the pulse generator, the counting frequency divider and the multi-path driver at the same time, and the output ends of the acousto-optic alarm circuit, the delay circuit, the pulse generator, the counting frequency divider and the multi-path driver are connected with the negative electrode of the band-type brake circuit power supply at the same time.

Preferably, the output signal of the pulse generator is applied to the count frequency divider, and the output signals of the delay circuit and the count frequency divider are applied to the multiplexing driver.

Wherein, the backup power supply: and a working power supply is provided for emergency braking and rescue.

Wherein, scram rescue/reset circuit: the partial circuit completes the conversion between a normal braking mode and an anti-lock braking system (ABS) braking mode; when an emergency stop/rescue button is pressed down, the relay KR1 works, and the brake is separated from the control of the band-type brake circuit and is powered by a backup power supply; meanwhile, the relay KR2 works, and the brake is switched into an anti-lock brake system (ABS) braking mode; when the reset button is pressed, the relays KR1 and KR2 are disconnected at the same time, and the brake returns to a normal braking state controlled by the band-type brake circuit.

Wherein, switching power supply: the +15V working power supply is provided for an acousto-optic alarm circuit, a delay circuit, a pulse generator, a counting frequency divider and a multi-path driver in an anti-lock braking system (ABS) control circuit.

Wherein, audible and visual alarm circuit: when the elevator is in an emergency braking or rescue state, a sound-light alarm is given out.

Wherein, delay circuit: the circuit and an anti-lock braking system (ABS) braking mode are started simultaneously, the ABS braking mode is only effective within a set delay time, and after the set delay time is reached, the delay circuit locks the output of the multi-way driver, so that each power switch MOSFET is cut off, and the brake is powered off.

Wherein the pulse generator: a pulse signal required to drive the brake coil is generated.

Wherein, the counting frequency divider: dividing the frequency of the signal output by the pulse generator; if the brake consists of two brake components, outputting a two-frequency division pulse; if the brake is composed of more than two brake components (such as a caliper disc brake), frequency division pulses corresponding to the number of groups are output according to the grouping condition of the brake components.

Wherein the multi-way driver: the pulse output by the counting frequency divider is sent to a multi-path driver to drive each MOSFET to work in a switch state, so that each braking component alternately executes the brake contracting and releasing actions, and inching braking is realized.

Wherein, the stopper: an anti-lock brake system (ABS) control actuator includes at least two sets of brake coils.

Wherein, power switch MOSFET: a power device driving the brake coil; if the brake is composed of two brake components, there are two power devices; if the brake is composed of more than two brake components (such as a caliper disc brake), there are power devices corresponding to the number of groups according to the grouping condition of the brake components.

The beneficial effects of the invention are as follows: the anti-lock braking system (ABS) of the elevator brake designed by the invention comprises two functions of emergency braking and manual brake release: when the elevator needs emergency braking under special conditions, the braking force of the elevator brake can be changed by starting an anti-lock brake system (ABS) braking mode so as to prolong the braking distance, reduce the deceleration and realize reliable dynamic braking, so that the elevator car can be prevented from being out of control or suddenly stopped, the danger caused by the emergency braking of the elevator under special conditions is greatly reduced, and the safety of elevator taking personnel is ensured; secondly when the power grid is down or the elevator breaks down and is shut down abnormally, and manual brake release is needed, a safe and reliable brake release measure can be provided, unsafe factors caused by the problems of corrosion or resistance increase and the like of a traditional manual remote brake release mechanism are eliminated, the safety of elevator control work is improved, and the elevator control system has remarkable technical and practical advantages.

Drawings

Fig. 1 is a schematic circuit diagram of an anti-lock brake system (ABS) control system for an elevator brake according to the present invention.

In the figure: 1. a backup power supply; 2. an emergency rescue/reset circuit; 3, switching a power supply; 4. an audible and visual alarm circuit; 5. a delay circuit; 6. a pulse generator; 7. a counting frequency divider; 8. a plurality of drivers; 9. a brake; 10. a power switch MOSFET1; 11. a power switch MOSFET2; 12. a brake coil; 13. a self-locking circuit; 14. a reset button; 15. scram/rescue buttons.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the technical contents of the embodiments described in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1, an anti-lock braking system (ABS) of an elevator brake comprises an emergency rescue/reset circuit 2, both ends of the emergency rescue/reset circuit 2 are connected in series with a brake circuit power supply, and a negative electrode of the brake circuit power supply is also connected to a negative electrode of a backup power supply 1; the emergency rescue/reset circuit 2 comprises a contact switch KR1-1, wherein a normally closed contact is connected with the positive electrode of the band-type brake circuit power supply and is controlled by a KR1 relay, a normally open contact of the contact switch KR1-1 is connected with the positive electrode of the backup power supply 1 and the input end of the relay KR1, a movable contact of the contact switch KR1-1 is connected with a movable contact of a contact switch KR1-2 controlled by the KR1 relay, a normally open contact of the contact switch KR1-2 is connected with the input end of the relay KR2, and the relay KR2 is connected with a switch power supply 3 in parallel; two ends of the switching power supply 3 are simultaneously connected in parallel with the acousto-optic alarm circuit 4, the delay circuit 5, the pulse generator 6, the counting frequency divider 7 and the multi-path driver 8; the output end of the multi-path driver 8 is simultaneously connected with the grids of the power switch MOSFET110 and the power switch MOSFET211 in series, the drain output end of the power switch MOSFET110 is connected with a normally open contact of a contact switch KR2-1 controlled by a relay KR2, the source output end is connected with the negative pole of a band-type brake circuit power supply and is simultaneously connected with a normally closed contact of the contact switch KR2-1, the drain output end of the power switch MOSFET211 is connected with a normally open contact of the contact switch KR2-2 controlled by the relay KR2, and the source output end is connected with the negative pole of the band-type brake circuit power supply and is simultaneously connected with a normally closed contact of the contact switch KR 2-2; the moving contacts of the contact switch KR2-1 and the contact switch KR2-2 are simultaneously connected to the output terminal of the actuator 9, and the simultaneous input terminals of the actuator 9 are connected to the moving contacts of the contact switch KR1-1 and the contact switch KR 1-2.

Further, the output end of the relay KR1 is simultaneously connected with the input end of the self-locking circuit 13 and the input end of the emergency stop/rescue button 15, the output end of the self-locking circuit 13 is connected with the input end of the reset button 14, the output end of the reset button 14 and the output end of the emergency stop/rescue button 15 are simultaneously connected with the negative electrode of the contracting brake circuit power supply, the output end of the relay KR2 is connected with the negative electrode of the contracting brake circuit power supply while being connected with the switch power supply 3, the brake 9 comprises two groups of brake coils 12, the input ends of the two groups of brake coils 12 are simultaneously connected with the movable contacts of the contact switches KR1-1 and KR2-2, the output end of one group of brake coils 12 in the brake 9 is connected with the movable contact of the contact switch KR2-1, the output end of the other group of brake coils 12 is connected with the movable contact of the contact switch KR2-2, the switch power supply 3 is simultaneously an acousto-optic alarm circuit 4, a delay circuit 5, a pulse generator 6, a counter 7 and a multi-path driver 8 provide a +15V working voltage, and the acousto-optic alarm circuit 4, the delay circuit 5, the pulse generator 6, the divider circuit 7 and the divider 7 and the multi-path driver 8 output a divider circuit outputs a divider signal, and a divider circuit 8, and a divider circuit output a divider circuit.

For simplicity, in the embodiments of the present embodiment, the brake 9 is divided into two left and right groups of brake components, and so on for the case that the brake components of the brake 9 are divided into three or four groups.

In the emergency stop rescue/reset circuit 2, one end of a coil of a relay KR1 is connected with the positive electrode of a backup power supply 1 and a normally open contact of a contact switch KR1-1, and the other end of the coil is connected with a self-locking circuit 13 and is connected to the backup power supply 1 and the negative electrode of a band-type brake circuit power supply through a normally open emergency stop/rescue button 15; the other end of the self-locking circuit 13 is used for frequently closing a reset button 14 to the negative electrodes of the backup power supply 1 and the band-type brake circuit power supply; when the emergency stop/rescue button 15 is pressed to start an anti-lock brake system (ABS) working mode, the coil of the relay KR1 is energized, the normally open contact of the contact switch KR1-1 is closed, and the backup power supply 1 supplies power to the entire anti-lock brake system (ABS) control circuit and the brake coil 12.

In the emergency stop rescue/reset circuit 2, one end of a coil of a relay KR2 is connected with the positive input end of a switch power supply 3 and a normally open contact of a contact switch KR1-2, and the other end of the coil is connected with the negative input end of the switch power supply 3, a backup power supply 1 and the negative electrode of a band-type brake circuit power supply; when an anti-lock braking system (ABS) working mode is started, a normally open contact of the contact switch KR1-2 is closed, and the backup power supply 1 supplies power to the switch power supply 3; meanwhile, the coil of the relay KR2 is electrified, and the normally open contacts of the contact switch KR2-1 and the contact switch KR2-2 are closed, so that the two groups of brake coils 12 are respectively connected to the drain electrodes of the power switch MOSFET110 and the power switch MOSFET 211.

The output of the switch power supply 3 is simultaneously connected with the acousto-optic alarm circuit 4, the delay circuit 5, the pulse generator 6, the counting frequency divider 7 and the multi-path driver 8, and +15V working voltage is provided for the multi-path driver.

The output of the pulse generator 6 is connected with the counting frequency divider 7, the output of the counting frequency divider 7 is connected with the multi-path driver 8, the output of the multi-path driver 8 is connected with the grids of the power switch MOSFET110 and the power switch MOSFET211, and the drains of the power switch MOSFET110 and the power switch MOSFET211 are respectively connected with the normally open contacts of the contact switch KR2-1 and the contact switch KR 2-2.

The common ends of the two groups of brake coils 12 are connected with the positive electrode of the contracting brake circuit power supply through the normally closed contacts of the contact switch KR1-1, and the other ends of the two groups of brake coils are connected with the negative electrode of the contracting brake circuit power supply through the normally closed contacts of the contact switch KR2-1 and the contact switch KR 2-2.

The drain electrodes of the power switch MOSFET110 and the power switch MOSFET211 are respectively connected with the normally open contacts of the contact switch KR2-1 and the contact switch KR2-2, the source electrodes of the power switch MOSFET110 and the power switch MOSFET211 are connected with the negative electrode of a band-type brake circuit power supply, when an anti-lock brake (ABS) working mode is started, the normally open contacts of the contact switch KR2-1 and the contact switch KR2-2 are closed, two groups of brake coils 12 are respectively connected with the drain electrodes of the power switch MOSFET110 and the power switch MOSFET211, and the brake coils 12 are controlled by the power switch MOSFET110 and the power switch MOSFET 211.

The specific implementation mode of the anti-lock brake system (ABS) of the elevator is as follows:

under normal conditions, the contact switch KR1-1, the contact switch KR1-2 and the contact switch KR2-1, the normally closed contact of the contact switch KR2-2 are the closed state, the public end of two sets of brake coils 12 is connected to the positive pole of band-type brake circuit power supply through the normally closed contact of the contact switch KR1-1, the other end of the brake coil 12 is connected to the negative pole of the band-type brake circuit power supply through the normally closed contact of the contact switch KR2-1 and the normally closed contact of the contact switch KR2-2, and the brake 9 is controlled by the band-type brake circuit. Circuits related to anti-lock brake system (ABS) control are not operated and are completely in a power-off state.

1. Emergency braking:

when the elevator car runs between landings (goes upwards or downwards), the brake circuit is in a power-on state, and the brake 9 is kept in a brake-off state; if the elevator has an emergency situation, an anti-lock braking mode can be started through the emergency stop/rescue button 15, and the elevator is controlled to safely decelerate until the elevator stops.

The working process is as follows:

when the emergency stop/rescue button 15 is pressed, the coil of the relay KR1 is energized, and the contact switch KR1-1 and the contact switch KR1-2 operate, and at the same time, the self-lock circuit 13 operates to lock the energized state of the relay KR 1. A normally closed contact of the contact switch KR1-1 is tripped, so that the brake 9 is separated from the control of the contracting brake circuit, and a backup power supply 1 supplies power to a brake coil 12; meanwhile, a normally open contact of the contact switch KR1-2 is closed, the coil of the switch power supply 3 and the coil of the relay KR2 are electrified, and an acousto-optic alarm circuit 4, a delay circuit 5, a pulse generator 6, a counting frequency divider 7 and a multi-way driver 8 in an anti-lock brake system (ABS) control circuit start to work; the coil of the relay KR2 is electrified to close normally open contacts of a contact switch KR2-1 and a contact switch KR2-2, the left brake coil and the right brake coil 12 are respectively connected to the drain electrodes of a power switch MOSFET110 and a power switch MOSFET211, and the work mode is switched to an anti-lock brake system (ABS); pulse signals sent by the pulse generator 6 are subjected to frequency division by the counting frequency divider 7 to generate pulse signals with opposite phases, the pulse signals are respectively sent to the multi-path driver 8, and the output of the multi-path driver 8 drives the power switch MOSFET110 and the MOSFET211 to work in a switching state, so that the two groups of braking parts alternately execute contracting brake and releasing brake actions to realize inching braking; in the process of actuating the brake, the elevator is gradually decelerated, when the moving speed of the elevator car reaches the safe braking speed, the delay circuit 5 can block the multi-path driver 8, the output of the multi-path driver 8 is zero, the power switch MOSFET110 and the power switch MOSFET211 are cut off, and the left brake component and the right brake component are simultaneously powered off and contracting brakes; due to the existence of the self-locking circuit 13, the coils of the relay KR1 and the relay KR2 are always kept electrified, so that the state of the band-type brake is kept until the rescue workers arrive at the site for treatment (the reset button 14 is pressed after the fault is cleared). Therefore, the elevator car can be effectively prevented from being out of control, and the safety of elevator taking personnel is ensured.

2. Rescue implementation:

when the car stops abnormally due to power failure of a power grid or failure of an elevator control system, the brake circuit is in a power-off state, and the brake 9 is kept in a brake state; at the moment, if the elevator car cannot level the floor and people taking the elevator are trapped, the elevator can finish leveling by starting anti-lock control instead of manually releasing the brake, and the trapped people are relieved.

The working process is as follows:

the reset button 14 is pressed to be fixed, so that the self-locking circuit 13 does not work; then pressing down an emergency stop/rescue button, electrifying a coil of the relay KR1, enabling the contact switch KR1-1 and the contact switch KR1-2 to act, enabling the brake 9 to be separated from the control of the band-type brake circuit by the contact switch KR1-1, and supplying power to a brake coil 12 by a backup power supply 1; the contact switch KR1-2 energizes the switch power supply 3, and the acousto-optic alarm circuit 4, the delay circuit 5, the pulse generator 6, the counting frequency divider 7 and the multi-path driver 8 in the anti-lock brake system (ABS) control circuit start to work; the contact switch KR1-2 energizes the coil of the relay KR2, the contact switch KR2-1 and the contact switch KR2-2 act to connect the left and right brake coils 12 to the drains of the power switch MOSFET110 and the power switch MOSFET211 respectively, and the work mode is switched to an anti-lock brake system (ABS) work mode; pulse signals sent by the pulse generator 6 are subjected to frequency division by the counting frequency divider 7 to generate pulse signals with opposite phases, the pulse signals are respectively sent to the multi-path driver 8, the output of the multi-path driver 8 drives the power switch MOSFET110 and the power switch MOSFET211 to work in a switching state, so that the two groups of braking parts alternately execute contracting brake and releasing brake actions to realize inching braking; in the process of clicking the brake, the elevator car moves slowly, when the car reaches a landing, the emergency stop/rescue button 15 is released, the brake 9 is in band-type brake, and then the reset button 14 is released; because the emergency stop/rescue button 15 is disconnected, the coils of the relays KR1 and KR2 are powered off, the normally closed contacts of the contact switches KR1-1, KR1-2, KR2-1 and KR2-2 are closed, the band-type brake system is restored to a normal working mode, and the control right of the brake 9 is handed back to the band-type brake circuit.

The frequency of the pulse generator 6 is changed, so that the action frequency of the inching brake can be correspondingly changed; generally, the work period of the brake 9 is about 0.4s, the pulse period of the pulse generator 6 is adjusted to be not less than the value, and when the braking parts are divided into two groups, the action frequency of the brake is about 5 times/s; when the braking components are divided into three groups, the action frequency of the brake is about 6-8 times/s; when the braking parts are divided into four groups, the action frequency of the brake is about 10 times/s.

The operating time of the delay circuit should be greater than the time described below: when the elevator is loaded with 125% of the rated load and is running down at the rated speed, the moving speed of the elevator car can be gradually reduced to a time capable of safely stopping the speed after pressing the emergency stop/rescue button 15.

In the invention, the anti-lock brake system (ABS) of the elevator brake designed by the invention comprises two functions of emergency braking and manual brake release: when the elevator has special conditions and needs emergency braking, the braking force of the elevator brake can be changed by starting an anti-lock brake system (ABS) braking mode so as to prolong the braking distance, reduce the deceleration and realize reliable dynamic braking, thereby preventing the elevator car from being out of control or suddenly stopping, greatly reducing the danger caused by the emergency braking of the elevator under the special conditions and ensuring the safety of elevator passengers; secondly when meeting the electric wire netting and falling down or the elevator breaks down and the abnormal shut down appears and need manual brake release, can provide a safe and reliable brake release measure, got rid of the unsafe factor that traditional manual long-range brake release mechanism brought because of corrosion or resistance increase scheduling problem, improved the security of elevator control work, had apparent technical and practicality advantage.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An anti-lock braking system (ABS) control system for an elevator brake, comprising: the control system comprises an emergency rescue/reset circuit (2), two ends of the emergency rescue/reset circuit (2) are connected with a brake circuit power supply in series, and the negative electrode of the brake circuit power supply is also connected with the negative electrode of a backup power supply (1) at the same time;

the emergency rescue/reset circuit (2) comprises a contact switch KR1-1, wherein a normally closed contact of the contact switch KR1-1 is connected with the positive electrode of the contracting brake circuit power supply and is controlled by a KR1 relay, a normally open contact of the contact switch KR1-1 is connected with the positive electrode of the backup power supply (1) and the input end of the relay KR1, a movable contact of the contact switch KR1-1 is connected with a movable contact of the contact switch KR1-2 controlled by the KR1 relay, a normally open contact of the contact switch KR1-2 is connected with the input end of the relay KR2, and the relay KR2 is connected with a switch power supply (3) in parallel; two ends of the switching power supply (3) are simultaneously connected in parallel with the acousto-optic alarm circuit (4), the delay circuit (5), the pulse generator (6), the counting frequency divider (7) and the multi-channel driver (8);

the output end of the multi-path driver (8) is simultaneously connected with the grids of a power switch MOSFET1 (10) and a power switch MOSFET2 (11) in series, the drain output end of the power switch MOSFET1 (10) is connected with a normally open contact of a contact switch KR2-1 controlled by a relay KR2, the source output end is connected with the negative electrode of a band-type brake circuit power supply and simultaneously connected with a normally closed contact of the contact switch KR2-1, the drain output end of the power switch MOSFET2 (11) is connected with a normally open contact of the contact switch KR2-2 controlled by the relay KR2, and the source output end is connected with the negative electrode of the band-type brake circuit power supply and simultaneously connected with a normally closed contact of the contact switch KR 2-2; the movable contacts of the contact switch KR2-1 and the contact switch KR2-2 are simultaneously connected with the output end of the brake (9), and the input end of the brake (9) is simultaneously connected with the movable contacts of the contact switch KR1-1 and the contact switch KR 1-2.

2. An anti-lock braking (ABS) control system for an elevator brake according to claim 1, wherein: the output end of the relay KR1 is simultaneously connected with the input end of the self-locking circuit (13) and the input end of the emergency stop/rescue button (15).

3. An anti-lock braking (ABS) control system for an elevator brake according to claim 2, wherein: the output end of the self-locking circuit (13) is connected with the input end of a reset button (14), and the output end of the reset button (14) and the output end of an emergency stop/rescue button (15) are simultaneously connected with the negative electrode of a band-type brake circuit power supply.

4. An anti-lock braking (ABS) control system for an elevator brake according to claim 1, wherein: the output end of the relay KR2 is connected with the negative electrode of the band-type brake circuit power supply while being connected with the switching power supply (3).

5. An anti-lock braking (ABS) control system for an elevator brake according to claim 1, wherein: the brake (9) comprises two groups of brake coils (12), and the input ends of the two groups of brake coils (12) are simultaneously connected with the movable contacts of the contact switch KR1-1 and the contact switch KR 1-2.

6. An anti-lock brake system (ABS) control system for an elevator brake according to claim 5, wherein: the output end of one group of brake coils (12) in the brake (9) is connected with the movable contact of the contact switch KR2-1, and the output end of the other group of brake coils (12) is connected with the movable contact of the contact switch KR 2-2.

7. An anti-lock braking (ABS) control system for an elevator brake according to claim 1, wherein: the switching power supply (3) provides +15V working voltage for the acousto-optic alarm circuit (4), the delay circuit (5), the pulse generator (6), the counting frequency divider (7) and the multi-channel driver (8) at the same time, and the output ends of the acousto-optic alarm circuit (4), the delay circuit (5), the pulse generator (6), the counting frequency divider (7) and the multi-channel driver (8) are connected with the negative electrode of the band-type brake circuit power supply at the same time.

8. An anti-lock braking (ABS) control system for an elevator brake according to claim 1, wherein: the output signal of the pulse generator (6) acts on the counting frequency divider (7), and the output signals of the delay circuit (5) and the counting frequency divider (7) act on the multi-way driver (8).