CN113003350A - Elevator safety control method and elevator safety control device - Google Patents
Elevator safety control method and elevator safety control device Download PDFInfo
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- CN113003350A CN113003350A CN202110335380.4A CN202110335380A CN113003350A CN 113003350 A CN113003350 A CN 113003350A CN 202110335380 A CN202110335380 A CN 202110335380A CN 113003350 A CN113003350 A CN 113003350A
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- elevator
- braking
- running speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
- B66B5/18—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces
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Abstract
The invention discloses an elevator safety control method and an elevator safety control device, wherein the elevator comprises a braking device arranged on an elevator car, the braking device is symmetrically arranged on the outer side surface of the elevator car, and the control method comprises the following steps: acquiring the position of the lift car in real time; when the position of the lift car is lower than a preset position, acquiring the running speed of the lift in real time; judging whether the elevator runs abnormally or not based on the position of the elevator car and the running speed of the elevator; and controlling the braking device to execute corresponding emergency braking operation based on the running speed of the elevator under the condition that the running abnormality of the elevator is determined, wherein the emergency braking operation is related to braking frequency and/or braking force. Through configuring an extra braking device for the elevator car and carrying out emergency protection on the safe operation of the elevator at the final stage of the operation of the elevator, the effectiveness of the safe braking of the elevator is improved, the use safety of the elevator is improved, and the user experience is improved.
Description
Technical Field
The invention relates to the technical field of elevator control, in particular to an elevator safety control method and an elevator safety control device.
Background
In modern cities, the allocation of elevators to each building is an essential requirement, as the height of buildings is increasing.
In order to protect the safety of the elevator running up and down in the hoistway during the running of the elevator, a plurality of safety protection devices are often provided for the elevator, for example, in the case of normal running, when braking is required, deceleration braking can be performed by a hoisting machine, forced braking can be performed by a brake device of the hoisting machine, and in the case of abnormal running, forced emergency braking can be performed on the elevator by a speed governor or a safety gear.
However, in the practical application process, the conventional braking is mainly performed by acting on a traction machine or a steel wire rope of the elevator to perform normal braking or forced braking on the elevator, but in the maintenance process, a lubricant may be smeared between the steel wire rope and a safety protection device due to negligence of maintenance personnel, so that the situation that the elevator car cannot be normally braked is caused, and great safety threats are caused to the safe operation of the elevator and the personal safety of passengers.
In the prior art, under the condition that the safety protection device fails, the elevator car is finally buffered and decelerated mainly through the buffer arranged at the bottom of the hoistway, however, when the car stalls at a high height, the deceleration effect of the buffer on the elevator car or the personal safety protection effect on passengers are limited, and the actual requirements of users cannot be met.
Disclosure of Invention
In order to solve the technical problems in the prior art, embodiments of the present invention provide an elevator safety control method and an elevator safety control device, in which an additional braking device is configured for an elevator car, and emergency protection is performed on the safe operation of an elevator at the final stage of the elevator operation, so that the effectiveness of elevator safety braking is improved, the safety of the elevator in use is improved, and the user experience is improved.
In order to achieve the above object, an embodiment of the present invention provides a safety control method for an elevator, the elevator including a braking device disposed on an elevator car, the braking device being symmetrically disposed on an outer side surface of the elevator car, the method including: acquiring the position of the lift car in real time; when the position of the lift car is lower than a preset position, acquiring the running speed of the lift in real time; judging whether the elevator runs abnormally or not based on the position of the elevator car and the running speed of the elevator; and controlling the braking device to execute corresponding emergency braking operation based on the running speed of the elevator under the condition that the running abnormality of the elevator is determined, wherein the emergency braking operation is related to braking frequency and/or braking force.
Preferably, the determining whether the elevator is abnormally operated based on the car position and the elevator operating speed includes: judging whether the position of the lift car is lower than a first preset position or not; when the position of the lift car is lower than the first preset position, judging whether the position of the lift car is lower than a second preset position; under the condition that the position of the car is lower than the first preset position and is not lower than the second preset position, judging whether the running speed of the elevator is greater than a preset speed threshold value or not, wherein the preset speed threshold value is greater than a rated running speed: determining that the elevator runs abnormally under the condition that the running speed of the elevator is greater than the preset speed threshold; and determining that the elevator runs abnormally under the condition that the position of the elevator car is lower than the second preset position.
Preferably, the controlling the braking device to perform a corresponding emergency braking operation based on the elevator running speed includes: under the condition that the position of the car is lower than the first preset position and not lower than the second preset position, controlling the braking device to execute a corresponding first emergency braking operation based on the running speed of the elevator; and controlling the braking device to execute a corresponding second emergency braking operation based on the elevator running speed under the condition that the car position is lower than the second preset position.
Preferably, the controlling the braking device to perform a corresponding first emergency braking operation based on the elevator running speed includes: judging whether the running speed of the elevator is greater than a first braking speed: when the elevator running speed is less than or equal to the first braking speed, acquiring a first braking force corresponding to the elevator running speed, and executing the first emergency braking operation based on the first braking force; and acquiring a first braking frequency and a second braking force corresponding to the elevator running speed when the elevator running speed is greater than the first braking speed, and executing the first emergency braking operation based on the first braking frequency and the second braking force.
Preferably, the controlling the braking device to perform a corresponding second emergency braking operation based on the elevator running speed includes: judging whether the running speed of the elevator is greater than a second braking speed: when the elevator running speed is less than or equal to the second braking speed, acquiring a third braking force corresponding to the elevator running speed, and executing a second emergency braking operation based on the third braking force; and acquiring a second braking frequency and a fourth braking force corresponding to the elevator running speed when the elevator running speed is greater than the second braking speed, and executing the second emergency braking operation based on the second braking frequency and the fourth braking force.
Correspondingly, the embodiment of the invention also provides an elevator safety control device, the elevator comprises a braking device, and the control device comprises: the position acquisition unit is used for acquiring the position of the car in real time; the speed acquisition unit is used for acquiring the running speed of the elevator in real time when the position of the elevator car is lower than a preset position; the abnormity judging unit is used for judging whether the elevator runs abnormally or not based on the position of the elevator car and the running speed of the elevator; and the braking unit is used for controlling the braking device to execute corresponding emergency braking operation based on the running speed of the elevator under the condition that the running abnormality of the elevator is determined, wherein the emergency braking operation is related to braking frequency and/or braking force.
Preferably, the abnormality determination unit includes: the first judgment module is used for judging whether the position of the lift car is lower than a first preset position or not; the second judgment module is used for judging whether the position of the lift car is lower than a second preset position or not when the position of the lift car is lower than the first preset position; the first determining module is used for judging whether the elevator running speed is greater than a preset speed threshold value or not under the condition that the position of the car is lower than the first preset position and is not lower than the second preset position, and the preset speed threshold value is greater than a rated running speed: determining that the elevator runs abnormally under the condition that the running speed of the elevator is greater than the preset speed threshold; and the second determining module is used for determining that the elevator runs abnormally under the condition that the position of the elevator car is lower than the second preset position.
Preferably, the brake unit includes: the first emergency braking module is used for controlling the braking device to execute corresponding first emergency braking operation based on the running speed of the elevator under the condition that the position of the elevator car is lower than the first preset position and not lower than the second preset position; and the second emergency braking module is used for controlling the braking device to execute corresponding second emergency braking operation based on the elevator running speed under the condition that the position of the elevator car is lower than the second preset position.
Preferably, the first emergency braking module is configured to: judging whether the running speed of the elevator is greater than a first braking speed: when the elevator running speed is less than or equal to the first braking speed, acquiring a first braking force corresponding to the elevator running speed, and executing the first emergency braking operation based on the first braking force; and acquiring a first braking frequency and a second braking force corresponding to the elevator running speed when the elevator running speed is greater than the first braking speed, and executing the first emergency braking operation based on the first braking frequency and the second braking force.
Preferably, the second emergency braking module is configured to: judging whether the running speed of the elevator is greater than a second braking speed: when the elevator running speed is less than or equal to the second braking speed, acquiring a third braking force corresponding to the elevator running speed, and executing a second emergency braking operation based on the third braking force; and acquiring a second braking frequency and a fourth braking force corresponding to the elevator running speed when the elevator running speed is greater than the second braking speed, and executing the second emergency braking operation based on the second braking frequency and the fourth braking force.
Through the technical scheme provided by the invention, the invention at least has the following technical effects:
through improving the safety control system and the safety control method of the existing elevator, on one hand, an extra braking device is configured for the elevator car, so that the elevator car is not influenced by the original elevator safety device in the braking process, on the other hand, the safety operation of the elevator is emergently protected in the final operation stage of the elevator according to the actual operation condition of the elevator, the effectiveness of the safety braking of the elevator is improved, the use safety of the elevator is improved, and the user experience is improved.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a flow chart of a specific implementation of an elevator safety control method provided by an embodiment of the invention;
fig. 2 is a flowchart of a specific implementation of determining whether an elevator is abnormally operated in an elevator safety control method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an elevator safety control apparatus according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
The terms "system" and "network" in embodiments of the present invention may be used interchangeably. The "plurality" means two or more, and in view of this, the "plurality" may also be understood as "at least two" in the embodiments of the present invention. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship, unless otherwise specified. In addition, it should be understood that the terms first, second, etc. in the description of the embodiments of the invention are used for distinguishing between the descriptions and are not intended to indicate or imply relative importance or order to be construed.
Referring to fig. 1, an embodiment of the present invention provides a safety control method for an elevator, where the elevator includes a braking device disposed on an elevator car, the braking device is symmetrically disposed on an outer side surface of the elevator car, and the control method includes:
s10) obtaining the position of the car in real time;
s20) when the position of the lift car is lower than a preset position, acquiring the running speed of the lift in real time;
s30) judging whether the elevator runs abnormally based on the position of the elevator car and the running speed of the elevator;
s40) controlling the braking device to perform a corresponding emergency braking operation based on the elevator running speed in case of determining that the elevator running is abnormal, the emergency braking operation being related to a braking frequency and/or a braking force.
In a possible embodiment, the braking devices are symmetrically arranged on the outer side of the elevator car, for example, the braking devices can be arranged in a matching manner with the elevator guide rails on both sides of the elevator car, or can be additionally arranged at symmetrical positions on the outer side of the elevator car, and corresponding friction pieces are arranged in the elevator hoistway in a matching manner with the braking devices so as to provide corresponding braking force when the braking devices act, so that the additionally arranged braking devices can play a final safety protection role under the condition that the safety protection devices in the elevator control system fail.
In the practical application process, the elevator control system is electrically connected with the braking device, the elevator control system acquires the position of the elevator car in real time in the elevator running process, for example, the position of the elevator car can be acquired in real time through a traction machine encoder, the position of the elevator car can also be acquired in real time through a position sensor arranged on the elevator car, when the position of the elevator car is monitored to be lower than a preset position, the running speed of the elevator is acquired in real time, and whether the elevator runs abnormally is judged according to the position of the elevator car and the running speed of the elevator.
In the embodiment of the invention, the traditional elevator is improved, the additional braking device is arranged on the car, and the emergency protection operation on the elevator is triggered at the final operation stage of the elevator, so that the emergency protection operation on the elevator can be effectively carried out, the personal safety of passengers is guaranteed, and the use safety of the elevator is improved.
Referring to fig. 2, in the embodiment of the present invention, the determining whether the elevator runs abnormally based on the car position and the elevator running speed includes:
s31) determining whether the car position is lower than a first preset position;
s32) when the position of the lift car is lower than the first preset position, judging whether the position of the lift car is lower than a second preset position, wherein the second preset position is lower than the lowest leveling position of the lift;
s331) under the condition that the position of the lift car is lower than the first preset position and not lower than the second preset position, judging whether the running speed of the lift is higher than a preset speed threshold value, wherein the preset speed threshold value is higher than a rated running speed: determining that the elevator runs abnormally under the condition that the running speed of the elevator is greater than the preset speed threshold;
s332) determining that the elevator runs abnormally under the condition that the position of the elevator car is lower than the second preset position.
In a possible implementation, since the braking device provided by the embodiment of the invention is mainly used for supplementary safety protection in the case of failure of the elevator safety protection device, it is determined that the operation condition of the elevator needs to be pre-monitored for final protection of the elevator only when the elevator is operated to a first preset position, for example, the first preset position is a preset protection height, for example, the preset protection height is a second floor position or a third floor position. In the practical application process, when the position of the car is lower than the first preset position, the running speed of the elevator may be within a normal range, and therefore, the normal detection means cannot find the abnormality of the running of the elevator at this time, and therefore, it is necessary to further monitor whether the position of the car is lower than a second preset position at this time, for example, the second preset position is a forced stopping position, for example, the forced stopping position is a position at a preset distance (for example, the preset distance is 50cm) below the position of one floor, and thus, the arrangement can effectively avoid the malfunction caused by the situation that the position of the car is temporarily lower than the position of one floor due to the fact that the steel wire rope is stretched in the process of stopping the elevator at the floor, so that the accuracy of elevator safety protection control is improved.
For example, at a certain moment, the elevator control system monitors that the position of the car is lower than the first preset position and not lower than the second preset position, and monitors that the running speed of the elevator is higher than a preset speed threshold value, for example, the preset speed threshold value is 1.5 times of the rated speed, so that the abnormal running of the elevator is determined and the corresponding emergency braking operation needs to be immediately executed.
In another possible embodiment, after the elevator car has traveled below the first preset position, the elevator control system monitors that the elevator travel speed is less than the preset speed threshold, whereas at another moment, the elevator control system monitors that the car position is below the second preset position, thus determining that the elevator travel is abnormal and requiring immediate execution of a corresponding emergency braking operation.
In the embodiment of the invention, whether the elevator is in an abnormal state or not is judged according to the position of the car and the running speed of the elevator, so that whether the elevator is abnormal or not in the final running stage can be accurately reflected, the judgment accuracy in the process of braking protection of the elevator can be effectively ensured, the influence of misoperation on a user is avoided, the control accuracy is improved, and the user experience is improved.
In an embodiment of the present invention, the controlling the braking device to perform a corresponding emergency braking operation based on the elevator running speed includes: under the condition that the position of the car is lower than the first preset position and not lower than the second preset position, controlling the braking device to execute a corresponding first emergency braking operation based on the running speed of the elevator; and controlling the braking device to execute a corresponding second emergency braking operation based on the elevator running speed under the condition that the car position is lower than the second preset position.
In an embodiment of the present invention, the controlling the braking device to perform a corresponding first emergency braking operation based on the elevator running speed includes: judging whether the running speed of the elevator is greater than a first braking speed: when the elevator running speed is less than or equal to the first braking speed, acquiring a first braking force corresponding to the elevator running speed, and executing the first emergency braking operation based on the first braking force; and acquiring a first braking frequency and a second braking force corresponding to the elevator running speed when the elevator running speed is greater than the first braking speed, and executing the first emergency braking operation based on the first braking frequency and the second braking force.
In an embodiment of the present invention, the controlling the braking device to perform a corresponding second emergency braking operation based on the elevator running speed includes: judging whether the running speed of the elevator is greater than a second braking speed: when the elevator running speed is less than or equal to the second braking speed, acquiring a third braking force corresponding to the elevator running speed, and executing a second emergency braking operation based on the third braking force; and acquiring a second braking frequency and a fourth braking force corresponding to the elevator running speed when the elevator running speed is greater than the second braking speed, and executing the second emergency braking operation based on the second braking frequency and the fourth braking force.
In a possible embodiment, when the car position is lower than the first preset position, the elevator control system monitors that the elevator runs abnormally, and therefore immediately executes a corresponding first emergency braking operation, and in order to protect the braking device and improve the braking effect, different braking modes are further adopted according to the elevator running speed, for example, in the embodiment of the invention, the elevator control system further judges whether the elevator running speed is higher than the first braking speed, if the elevator running speed is lower than or equal to the first braking speed, it can be determined that the elevator overspeed condition is not serious, and therefore the elevator car can be directly braked, so that the corresponding first emergency braking operation is immediately generated, specifically, a corresponding first braking force is generated according to the elevator running speed, and the braking device is controlled to execute the first emergency braking operation according to the first braking force, in the embodiment of the invention, the first braking force, the second braking force, the third braking force and the fourth braking force are related to the running speed of the elevator, and the larger the running speed of the elevator is, the larger the braking force is, for example, when the braking device clamps the guide rails of the elevator according to the braking force, and the clamping force is the braking force.
In the embodiment of the invention, different emergency braking operations are executed according to the position of the elevator car when the elevator runs abnormally, generally, when the elevator is above the lowest flat bed position, a larger buffer space is provided when the elevator is braked by the braking device, so a milder braking mode can be adopted.
In another possible embodiment, the elevator control system monitors that the position of the elevator car is below a second predetermined position, thus determining that the elevator operation is abnormal and immediately performing a corresponding second emergency braking operation. In this embodiment, first, it is determined whether the elevator running speed is greater than a second braking speed, for example, the second braking speed is the rated elevator running speed, for example, in the embodiment of the present invention, the elevator control system determines that the elevator running speed is greater than the rated elevator running speed, so it is determined that the elevator is in a serious safety accident at this time, such as a steel wire rope fracture, a steel wire rope slip, and the like, at this time, if a simple direct braking operation is adopted, on one hand, the braking device may slip to reduce the braking effect, and on the other hand, an instantaneous large braking force may damage the braking device so that effective braking cannot be achieved, therefore, in the embodiment of the present invention, a second braking frequency and a fourth braking force corresponding to the elevator running speed are immediately obtained, and the braking device is controlled to output the fourth braking force, for example, the braking device outputs the, in the embodiment of the invention, the first braking frequency and the second braking frequency are related to the running speed of the elevator, for example, the first braking frequency and the second braking frequency are higher as the running speed of the elevator is higher, for example, the braking device is pressed against the friction plate through the pressing part, and the pressing part is controlled to rapidly and frequently switch in the states of pressing against the friction plate, separating from the friction plate, pressing against the friction plate and separating from the friction plate at the second braking frequency, so that under the condition of obtaining enough braking force, better buffer braking effect is realized, relative sliding between the braking device and the friction plate is effectively prevented, and better braking effect is realized.
An elevator safety control device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
Referring to fig. 3, based on the same inventive concept, an embodiment of the present invention provides an elevator safety control apparatus, where the elevator includes a braking device, and the control apparatus includes: the position acquisition unit is used for acquiring the position of the car in real time; the speed acquisition unit is used for acquiring the running speed of the elevator in real time when the position of the elevator car is lower than a preset position; the abnormity judging unit is used for judging whether the elevator runs abnormally or not based on the position of the elevator car and the running speed of the elevator; and the braking unit is used for controlling the braking device to execute corresponding emergency braking operation based on the running speed of the elevator under the condition that the running abnormality of the elevator is determined, wherein the emergency braking operation is related to braking frequency and/or braking force.
In an embodiment of the present invention, the abnormality determining unit includes: the first judgment module is used for judging whether the position of the lift car is lower than a first preset position or not; the second judgment module is used for judging whether the position of the lift car is lower than a second preset position or not when the position of the lift car is lower than the first preset position; the first determining module is used for judging whether the elevator running speed is greater than a preset speed threshold value or not under the condition that the position of the car is lower than the first preset position and is not lower than the second preset position, and the preset speed threshold value is greater than a rated running speed: determining that the elevator runs abnormally under the condition that the running speed of the elevator is greater than the preset speed threshold; and the second determining module is used for determining that the elevator runs abnormally under the condition that the position of the elevator car is lower than the second preset position.
In an embodiment of the present invention, the brake unit includes: the first emergency braking module is used for controlling the braking device to execute corresponding first emergency braking operation based on the running speed of the elevator under the condition that the position of the elevator car is lower than the first preset position and not lower than the second preset position; and the second emergency braking module is used for controlling the braking device to execute corresponding second emergency braking operation based on the elevator running speed under the condition that the position of the elevator car is lower than the second preset position.
In an embodiment of the present invention, the first emergency braking module is configured to: judging whether the running speed of the elevator is greater than a first braking speed: when the elevator running speed is less than or equal to the first braking speed, acquiring a first braking force corresponding to the elevator running speed, and executing the first emergency braking operation based on the first braking force; and acquiring a first braking frequency and a second braking force corresponding to the elevator running speed when the elevator running speed is greater than the first braking speed, and executing the first emergency braking operation based on the first braking frequency and the second braking force.
In an embodiment of the present invention, the second emergency braking module is configured to: judging whether the running speed of the elevator is greater than a second braking speed: when the elevator running speed is less than or equal to the second braking speed, acquiring a third braking force corresponding to the elevator running speed, and executing a second emergency braking operation based on the third braking force; and acquiring a second braking frequency and a fourth braking force corresponding to the elevator running speed when the elevator running speed is greater than the second braking speed, and executing the second emergency braking operation based on the second braking frequency and the fourth braking force.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (10)
1. An elevator safety control method, the elevator comprises a braking device arranged on an elevator car, and is characterized in that the braking device is symmetrically arranged on the outer side surface of the elevator car, and the control method comprises the following steps:
acquiring the position of the lift car in real time;
when the position of the lift car is lower than a preset position, acquiring the running speed of the lift in real time;
judging whether the elevator runs abnormally or not based on the position of the elevator car and the running speed of the elevator;
and controlling the braking device to execute corresponding emergency braking operation based on the running speed of the elevator under the condition that the running abnormality of the elevator is determined, wherein the emergency braking operation is related to braking frequency and/or braking force.
2. The control method according to claim 1, wherein the determining whether the elevator is abnormally operated based on the car position and the elevator operating speed includes:
judging whether the position of the lift car is lower than a first preset position or not;
when the position of the lift car is lower than the first preset position, judging whether the position of the lift car is lower than a second preset position;
under the condition that the position of the car is lower than the first preset position and is not lower than the second preset position, judging whether the running speed of the elevator is greater than a preset speed threshold value or not, wherein the preset speed threshold value is greater than a rated running speed:
determining that the elevator runs abnormally under the condition that the running speed of the elevator is greater than the preset speed threshold;
and determining that the elevator runs abnormally under the condition that the position of the elevator car is lower than the second preset position.
3. The control method according to claim 2, wherein the controlling the braking device to perform a corresponding emergency braking operation based on the elevator running speed includes:
under the condition that the position of the car is lower than the first preset position and not lower than the second preset position, controlling the braking device to execute a corresponding first emergency braking operation based on the running speed of the elevator;
and controlling the braking device to execute a corresponding second emergency braking operation based on the elevator running speed under the condition that the car position is lower than the second preset position.
4. The control method according to claim 3, wherein the controlling the braking device to perform a corresponding first emergency braking operation based on the elevator running speed includes:
judging whether the running speed of the elevator is greater than a first braking speed:
when the elevator running speed is less than or equal to the first braking speed, acquiring a first braking force corresponding to the elevator running speed, and executing the first emergency braking operation based on the first braking force;
and acquiring a first braking frequency and a second braking force corresponding to the elevator running speed when the elevator running speed is greater than the first braking speed, and executing the first emergency braking operation based on the first braking frequency and the second braking force.
5. The control method according to claim 3, wherein the controlling the braking device to perform a corresponding second emergency braking operation based on the elevator running speed includes:
judging whether the running speed of the elevator is greater than a second braking speed:
when the elevator running speed is less than or equal to the second braking speed, acquiring a third braking force corresponding to the elevator running speed, and executing a second emergency braking operation based on the third braking force;
and acquiring a second braking frequency and a fourth braking force corresponding to the elevator running speed when the elevator running speed is greater than the second braking speed, and executing the second emergency braking operation based on the second braking frequency and the fourth braking force.
6. An elevator safety control device, the elevator including a braking device, characterized in that the control device comprises:
the position acquisition unit is used for acquiring the position of the car in real time;
the speed acquisition unit is used for acquiring the running speed of the elevator in real time when the position of the elevator car is lower than a preset position;
the abnormity judging unit is used for judging whether the elevator runs abnormally or not based on the position of the elevator car and the running speed of the elevator;
and the braking unit is used for controlling the braking device to execute corresponding emergency braking operation based on the running speed of the elevator under the condition that the running abnormality of the elevator is determined, wherein the emergency braking operation is related to braking frequency and/or braking force.
7. The brake apparatus according to claim 6, wherein the abnormality determination unit includes:
the first judgment module is used for judging whether the position of the lift car is lower than a first preset position or not;
the second judgment module is used for judging whether the position of the lift car is lower than a second preset position or not when the position of the lift car is lower than the first preset position;
the first determining module is used for judging whether the elevator running speed is greater than a preset speed threshold value or not under the condition that the position of the car is lower than the first preset position and is not lower than the second preset position, and the preset speed threshold value is greater than a rated running speed:
determining that the elevator runs abnormally under the condition that the running speed of the elevator is greater than the preset speed threshold;
and the second determining module is used for determining that the elevator runs abnormally under the condition that the position of the elevator car is lower than the second preset position.
8. The brake apparatus of claim 7, wherein the brake unit comprises:
the first emergency braking module is used for controlling the braking device to execute corresponding first emergency braking operation based on the running speed of the elevator under the condition that the position of the elevator car is lower than the first preset position and not lower than the second preset position;
and the second emergency braking module is used for controlling the braking device to execute corresponding second emergency braking operation based on the elevator running speed under the condition that the position of the elevator car is lower than the second preset position.
9. The brake apparatus of claim 8, wherein the first emergency brake module is configured to:
judging whether the running speed of the elevator is greater than a first braking speed:
when the elevator running speed is less than or equal to the first braking speed, acquiring a first braking force corresponding to the elevator running speed, and executing the first emergency braking operation based on the first braking force;
and acquiring a first braking frequency and a second braking force corresponding to the elevator running speed when the elevator running speed is greater than the first braking speed, and executing the first emergency braking operation based on the first braking frequency and the second braking force.
10. The braking apparatus of claim 8, wherein the second emergency braking module is configured to:
judging whether the running speed of the elevator is greater than a second braking speed:
when the elevator running speed is less than or equal to the second braking speed, acquiring a third braking force corresponding to the elevator running speed, and executing a second emergency braking operation based on the third braking force;
and acquiring a second braking frequency and a fourth braking force corresponding to the elevator running speed when the elevator running speed is greater than the second braking speed, and executing the second emergency braking operation based on the second braking frequency and the fourth braking force.
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