CN112125088A - Speed measuring device based on twin elevator, twin elevator and monitoring method of twin elevator - Google Patents

Abstract

The application discloses speed measuring device and two elevator's monitoring method based on two elevator, two elevator include along vertical direction arrange from top to bottom and move two cars in same well, and speed measuring device includes: a plurality of idler wheels, at least one idler wheel being mounted on each car; the traction part is wound around each inert wheel and is arranged between the top and the bottom of the well in a tensioning state, and when each car moves up and down in the well, the inert wheels rotate under the action of the traction part; the device comprises a plurality of sensors, at least one sensor is arranged at a corresponding position on each car, and each sensor acquires the speed and/or the position of the car by detecting the rotation of an inertia wheel on the car. The device can more accurately calculate the speed and the position of the car, so that the car can always run in an allowed safe distance, the safe running of the elevator is guaranteed, and the transportation efficiency is improved.

Description

Speed measuring device based on twin elevator, twin elevator and monitoring method of twin elevator

Technical Field

The application relates to the technical field of elevators, in particular to a speed measuring device based on a twin elevator, the twin elevator and a monitoring method of the twin elevator.

Background

The twin elevator is an elevator system with two cars in the same shaft, and the two cars can independently run up and down in the same shaft. In order to ensure that the two cars can safely travel in the hoistway without collision, the minimum allowable safe travel distance between the two cars is generally dynamically set, and the smaller the relative travel speed of the two cars, the smaller the allowable minimum safe distance is. Meanwhile, the system can track and judge in real time, once the safety distance between the two cars is smaller than the minimum allowable safe running distance under the set car relative speed, the elevator can immediately implement a safety protection mode to ensure that the two cars decelerate faster and enter the allowable safe running distance to ensure that the two cars never collide with each other, and the safety protection mode is generally ensured by multiple redundancy design. When the safety protection mode fails, a mechanical device for directly braking the car is finally arranged, and the car needs to be braked according to the safety command of the control system within any speed range from zero to rated speed, unlike the mode that the existing conventional speed limiter and safety tongs are used for braking the car in a linkage mode at a specific overspeed value.

Therefore, the speed and the position of the two cages can be measured more accurately and rapidly, and the safety operation of the twin elevator is the basis and guarantee. In the prior art, the magnetic grid ruler can be used for obtaining the magnetic grid ruler, but the cost is high; it is possible to use a sensor on the speed limiter or its attachment to obtain the speed and position of the car, but this approach is not suitable for twin elevators applying electronic safety tongs; the sensors can be arranged on the diversion sheave of the car or at the guide roller, but the diversion sheave is connected with the traction machine through the suspension rope, so that the bearing force is large, the risks of stagnation, slipping and even breaking exist, the guide roller can shake away from the car guide rail along with the car, and the data measured by the sensors generate large errors to influence the measuring accuracy; two-dimensional codes, laser ranging and other modes can be arranged in the well, but the reliability and the precision of the modes are not high, and the practical application operability is not strong.

Disclosure of Invention

In order to solve the technical problem, the application discloses a speed measuring device which is simple in structure, reliable in operation and relatively low in cost.

The application relates to a speed sensor based on twin elevator, twin elevator includes two cars of arranging and moving in same well from top to bottom along the vertical direction, speed sensor includes:

a plurality of idler wheels, at least one idler wheel being mounted on each car;

the traction part is wound around each inertia wheel and is arranged between the top and the bottom of the well in a tensioning state, and when each car moves up and down in the well, the inertia wheels rotate under the action of the traction part;

the elevator comprises a plurality of sensors, wherein at least one sensor is correspondingly arranged on each car, and each sensor acquires the speed and/or position of the car by detecting the rotation of an inert wheel on the car.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.

Optionally, all the inertia wheels are divided into two groups, each group corresponds to one of the cars, all the inertia wheels on the same car are located at the top of the car or at the bottom of the car, the axes of the inertia wheels in the same group are arranged in parallel, and the extension paths of the traction components on the inertia wheels in the same group are coplanar.

Optionally, in the extending direction of the traction component, the first idler wheel is aligned with the last idler wheel along the extending direction.

Optionally, the traction member is tensioned by installing a tension pulley near the top and/or bottom of the hoistway, and the traction member further passes around the tension pulley.

Optionally, in the same group of idler wheels, the wrap angle of the traction component to at least one idler wheel is greater than 180 degrees.

Optionally, the number of the traction components in the speed measuring device is only one.

Optionally, the sensor is mounted on an idler wheel, and at least one idler wheel in the same group of idler wheels is mounted with the sensor.

The application also provides a twin elevator, which comprises two cages and a control system, wherein the two cages are vertically arranged along the vertical direction and run in the same well, the twin elevator is also provided with the speed measuring device, and each sensor in the speed measuring device is respectively connected to the control system;

and the control system acquires the speed and/or position of each car according to the signals of the sensors and correspondingly controls the movement of each car.

The application also provides a monitoring method of the twin elevator, the twin elevator comprises two cages which are arranged up and down along the vertical direction and run in the same well, the twin elevator is also provided with the speed measuring device, and the monitoring method comprises the following steps:

receiving signals from sensors on each car;

converting the signals into state information of each car, wherein the state information is related to the speed or the position of the corresponding car;

and judging the state information, and correspondingly operating when the state information of each car is inconsistent with the preset state information.

Optionally, the determining the state information includes:

judging the distance between the two cars;

and when the distance between the two cages is smaller than a preset value, controlling at least one cage to decelerate or stop running.

The speed measuring device of this application, through laying alone the speed measuring device in the well of twin elevator, can be more accurate the velocity and/or the position of calculating the car, make the car move in the safe distance that allows all the time, the safe operation of guarantee elevator.

Drawings

Fig. 1 is a schematic structural diagram of a twin elevator in one embodiment;

FIG. 2 is a schematic diagram of a velocity measurement device according to an embodiment;

FIG. 3 is a schematic diagram of an idler pulley set in one embodiment;

the reference numerals in the figures are illustrated as follows:

100. a car;

200. an inert wheel set; 201. an inert wheel; 202. an axis; 203. a first idler wheel; 204. a second idler wheel; 205. a rotating shaft; 206. a centerline; 207. cutting a line;

300. a traction member; 301. a first partial traction member; 302. a second portion traction member; 303. a third portion traction member;

400. a sensor; 401. a connecting plate;

500. a tension wheel;

600. a hoistway; 601. a hoistway top; 602. the bottom of the well;

700. a speed measuring device.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 2, the present application discloses a speed measuring device 700 based on a twin elevator, the twin elevator includes two cars 100 arranged up and down along a vertical direction and running in a same hoistway 600, the speed measuring device includes:

a plurality of idler wheels 201, at least one idler wheel 201 being mounted on each car 100;

the traction component 300 is arranged between the top and the bottom of the shaft 600 in a tensioning state around each inertia wheel, and when each car 100 runs up and down in the shaft, the inertia wheels 201 rotate under the action of the traction component 300;

the system comprises a plurality of sensors 400, wherein at least one sensor 400 is correspondingly arranged on each car 100, and each sensor 400 detects the rotation of the idler wheel 201 on the car 100 to acquire the speed and/or position of the car 100.

A twin elevator refers to an elevator that travels up and down the same car guide rail in the same hoistway 600.

The idler wheel 201 is a wheel which does not actively rotate, is not loaded, and rotates only by friction with the traction member 300 when following the lifting of the car.

The tension of the traction element 300 prevents the traction element 300 from slipping and stalling during operation or the traction element 300 from being loosened due to permanent deformation during long-term operation. The tensioning method may include adjusting the center distance of the pulley to enable the traction member 300 to have a certain tensioning force when the traction member 300 is fixed by the pulley, or tensioning the traction member 300 by the tensioning wheel 500, or other feasible methods.

The sensor 400 is a device for acquiring position data of the car 100, the orientation and the speed change of the car 100 are confirmed based on the position of the car 100, if no position data of the car 100 exists or the position data of the car 100 has a deviation, certain influence is caused on the operation of the car 100, and the method for acquiring the position data of the car 100 by using the sensor 400 can comprise methods of confirming the position of the car 100 by a mechanical floor selector, confirming the position of the car 100 by a reed pipe, confirming the position of the car 100 by an encoder and the like.

The application adds a set of independent speed sensor 700 on the basis of current twin elevator for obtain the speed and/or the position of car 100 of place. The speed measuring device 700 is simple in structure, convenient to install and relatively low in installation cost, and the inertia wheel 201 in the speed measuring device 700 runs independently and does not have functions of guiding and the like in the running process of the car 100, so that the speed and/or the position of the car 100 measured through the inertia wheel 201 are more accurate. Correspondingly, in an embodiment, a twin elevator applying the speed measuring device 700 is also provided, which includes two cars 100 arranged vertically and running in the same hoistway, and a control system; where two cars 100 travel up and down the same car guide rail in the hoistway 600.

Each sensor 400 in the speed measuring device 700 is respectively connected to the control system, and the control system obtains the speed and/or position of each car 100 according to the signals transmitted by each sensor 400 and correspondingly controls each car 100 to move. The control system can compare the signals transmitted by the sensors 400 to improve the accuracy of the speed and/or position measurements of the car 100. In order to keep the traction component 300 in a tensioned state all the time during operation and ensure that the traction component 300 does not slip or stall during operation, in some embodiments, the traction component 300 is tensioned by using a tensioning wheel 500, the tensioning wheel 500 is mounted adjacent to the top 601 and/or the bottom 602 of the hoistway, and the traction component 300 is wound around the tensioning wheel 500. The traction component 300 at the top 601 of the hoistway is wound around the tension pulley 500, extends downwards vertically to connect with each idler pulley 201, penetrates out of each idler pulley 201, extends downwards vertically to the bottom 602 of the hoistway, and the traction component 300 at the bottom 602 of the hoistway is fixed by the tension pulley 500. The tension wheel 500 generates a force for tensioning the traction unit 300 using a spring or oil pressure, etc., so that the traction unit 300 can be pressed against the idler 201 with a suitable pressure, thereby keeping the traction unit 300 in a tensioned state all the time during the operation of the car 100.

In order to obtain the speed and/or position of each car separately, in some embodiments, all idler wheels 201 are divided into two groups, each group corresponding to one of the cars 100, and all idler wheels 201 on the same car 100 are located on the top of the car 100, or on the bottom of the car 100.

In order to make the structure of the speed measuring device more compact and facilitate installation and maintenance of constructors, in the same group of inertia wheels, referring to fig. 2, the left vertical tangent 207 of the second inertia wheel 204 is positioned on the left side of the center line 206 of the first inertia wheel 203, if other inertia wheels 201 are additionally arranged on the right side of the second inertia wheel 204, the left vertical tangent 207 of the next inertia wheel is arranged on the left side of the center line 206 of the previous inertia wheel; in another identical set of idler wheels, the right vertical tangent 207 of the trailing idler wheel is laid to the right of the centerline 206 of the leading idler wheel. Also, the axes 202 of the idler wheels of the same set are arranged parallel to each other, and the extension paths of the traction members 300 on the idler wheels of the same set are coplanar. The diameter and the width of each idler wheel 201 are the same, and when the idler wheels 201 are damaged, the idler wheels 201 can be conveniently repaired or replaced.

Referring to fig. 2, in order to facilitate the expression of the extension trend of the traction member 300, the traction member 300 may be divided into three parts, with reference to two idler wheel sets, including:

a first partial traction member 301 between the top end of the traction member 300 and the idler sheave group 200 of the upper car;

a second partial traction member 302 between the bottom end of the traction member 300 and the idler sheave assembly 200 of the lower car;

a third partial traction member 303 between the idler sets 200 of the two cars;

of course, in actual operation, the positions of the two cages are dynamic, so the length of each traction part is changed correspondingly, but the spatial relationship of the inertia wheel 201 to be expressed is not influenced.

As for the idler wheel group 200 as a whole, the tendency of the traction member 300 to be inclined should be avoided as much as possible, so that in the extending direction of the traction member 300, the first idler wheel is aligned with the last idler wheel along the extending direction. Even if the first idler wheel is aligned with the last idler wheel up and down, the first part traction component 301 and the second part traction component 302 are vertically connected into the first idler wheel or vertically connected out of the last idler wheel.

The leading idler wheel and the trailing idler wheel are relatively speaking, the terms are used interchangeably, for example, the first idler wheel around which the first part of the traction elements 301 are wound is the leading idler wheel, and the first idler wheel around which the second part of the traction elements 302 are wound is the trailing idler wheel, and vice versa.

In a preferred mode, the first partial traction element 301 and the second partial traction element 302 are arranged in a line, and in order to achieve the above effect and improve the universality of different idler wheel sets as much as possible, the idler wheels 201 in the two idler wheel sets 200 are the same in number, and even can be designed to be the same in structure and can be used interchangeably.

As shown in fig. 2, the idler wheels 201 in different idler wheel sets 200 are aligned one-to-one, and the number of idler wheels 201 in each idler wheel set 200 is the same, so that the third part of the traction member 303 can vertically extend from one idler wheel set to another idler wheel set, and the length of the connection of the traction members 300 between different idler wheel sets 200 is reduced, so that the speed measuring device 700 is more compact.

In order to prolong the service life of the traction part 300, the traction part 300 is a flat steel belt as a whole, and comprises a non-metal coating layer, for example, a plurality of steel wire ropes are embedded in the coating layer at intervals, each steel wire rope is formed by twisting a plurality of steel wires, and the coating layer can play a role in protection, so that the service life of the traction part 300 is prolonged. The phenomenon that the operation of the idler wheel 201 is unstable due to strand breakage or abrasion of the traction component 300 can be reduced, and the measurement accuracy of the sensor 400 can be improved.

Each steel wire has a diameter of less than 3mm and forms a steel wire rope after twisting, and the flat steel strip has a thickness of less than 4mm and a width of less than 30mm as a whole.

When the static friction force of the traction component 300 driving the idler wheels 201 to rotate is small, the idler wheels 201 can slip or rotate in a stalling way, and in order to improve the static friction force between the traction component 300 and the idler wheels 201, the wrap angle of the traction component 300 to at least one idler wheel 201 in the same group of idler wheels is larger than 180 degrees by adjusting the position of each idler wheel 201 in the same group of idler wheels.

Preferably, the inertia wheels of the same group should be kept compact, and the winding distance of the traction part 300 between two adjacent inertia wheels 201 should not be too long, so that the speed measuring device 700 operates more reliably, and the measurement accuracy of the sensor 400 mounted on the inertia wheels 201 is improved.

In order to save the space of the shaft 600 outside the vertical projection planes of the two cars 100 in the twin elevator, only one traction part 300 is arranged in the speed measuring device 700, and the traction part 300 is connected with all the inertia wheels in series, so that the arrangement of the speed measuring device 700 is simpler and more convenient, the installation cost is saved, the signal synchronism of the sensors 400 corresponding to the two groups of inertia wheels is better, and the signal noise is reduced.

Referring to fig. 3, which shows one of the connection ways of the idler wheel 201 and the car 100, a connection plate 401 is fixed on the car, the idler wheel 201 is rotatably matched with the connection plate 401 through a rotating shaft 205, and a sensor 400 can be installed on the car 100 or the connection plate 401 and is adjacent to the idler wheel 201 for sensing the rotation of the idler wheel 201.

On the premise of not considering the error, the linear speed of the movement of the idle wheel 201 is consistent with the linear speed of each car 100 moving in the vertical direction in the hoistway 600, and at this time, the rotation angle of the idle wheel 201 can be sensed through the sensor 400, and the rotation angle can be converted into the state information of the speed and/or the position of the car 100 in combination with the time period.

The sensor 400 is mounted on idler wheel 201 and at least one idler wheel of the same set is mounted with sensor 400. When each car 100 only has one sensor 400, if the sensor 400 fails to measure normally, the state information of the speed and/or position of the car 100 cannot be acquired in real time, and the normal operation of the twin elevator is affected. In order to ensure the operation reliability of the twin elevator and improve the measurement accuracy of the sensors 400, it is preferable that at least two or all the idler wheels 201 in the same group of idler wheels are provided with the sensors 400, and by adopting a redundancy design, on one hand, when one of the sensors 400 is damaged, the rest of the sensors 400 can still transmit the state information of the car 100 in real time, and on the other hand, a plurality of groups of state information acquired by the sensors 400 can be sent to a control system for comparison processing, the most accurate state information is obtained through calculation, and the operation of the twin elevator is controlled through the state information.

The sensor 400 may be an encoder, and when the idler wheel 201 rotates once, the encoder generates a plurality of pulse signals, so that the number of the pulse signals output by the encoder can be used to calculate the running speed of the elevator, or the number of the pulses output by the encoder can be used to correspondingly calculate the displacement of the car 100, thereby confirming the position of the car 100.

An embodiment of the present application provides a monitoring method for a twin elevator, where the twin elevator can be combined with the above embodiments, for example, the twin elevator includes two cars 100 arranged above and below in a vertical direction and running in a same hoistway, the twin elevator is further provided with the speed measuring device 700, and the monitoring method includes:

the control system receives signals from the sensors 400 on each car 100, converts the signals into state information of each car 100, the state information is related to the speed or position of the corresponding car 100, judges the state information, and performs corresponding operation when the state information of each car 100 does not accord with preset.

The state information of the cages 100 can be acquired in real time through the monitoring method, the distance between the two cages 100 in operation is guaranteed to be always larger than the safe distance, and the twin elevator can operate safely.

And judging the state information comprises judging the distance between the two cars, and controlling at least one car to decelerate or stop running when the distance between the two cars is smaller than a preset value.

The monitoring method of the twin elevator may include the specific steps that when the car 100 runs, the traction component 300 drives the idle wheel 201 to run at the same linear velocity as the car 100, at this time, the sensor 400 on each car 100 can calculate the state information of the car 100 through the rotation velocity of the idle wheel 201, send a plurality of state information to the control system for comparative analysis, obtain the most accurate positions of the two cars 100, and further determine the distance between the two cars 100, and the controller controls the car 100 to run correspondingly according to the distance between the two cars 100.

When the positions of the two cars 100 are obtained, the distance between the two cars 100 is obtained through calculation, when the distance between the two cars 100 is greater than the safe running distance, the two cars 100 can run normally, and when the distance between the two cars 100 is less than the safe running distance, the control system can send a command to enable one car 100 or the two cars 100 to run in a speed reduction mode, the relative running speed between the two cars 100 is reduced until the distance between the two cars 100 reaches the safe running distance, or the two cars 100 stop completely.

The safe running distance is changed in real time along with the relative running speed of the two cars 100, and when the relative running speed of the two cars 100 is higher, the safe running distance is smaller; the greater the distance between the cars 100, the greater the safety distance.

The speed measuring device can be independently applied, and can also be applied as a redundancy design of an existing system for measuring the speed and/or the position of the car.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features. When technical features in different embodiments are represented in the same drawing, it can be seen that the drawing also discloses a combination of the embodiments concerned.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.

Claims (10)

1. A speed measuring device based on a twin elevator, the twin elevator includes two cars that are arranged from top to bottom along the vertical direction and run in the same well, characterized in that, the speed measuring device includes:

a plurality of idler wheels, at least one idler wheel being mounted on each car;

the traction part is wound around each inertia wheel and is arranged between the top and the bottom of the well in a tensioning state, and when each car moves up and down in the well, the inertia wheels rotate under the action of the traction part;

the elevator comprises a plurality of sensors, wherein at least one sensor is correspondingly arranged on each car, and each sensor acquires the speed and/or position of the car by detecting the rotation of an inert wheel on the car.

2. The twin-elevator-based speed measuring device according to claim 1, wherein all the idler wheels are divided into two groups, each group corresponds to one of the cars, all the idler wheels on the same car are located on the top of the car or on the bottom of the car, the axes of the idler wheels in the same group are arranged in parallel, and the extension paths of the traction members on the idler wheels in the same group are coplanar.

3. The twin-elevator-based speed measuring device according to claim 2, wherein the leading idler sheave and the trailing idler sheave are aligned in the extending direction of the traction member.

4. The twin-elevator-based speed measuring device according to claim 1, wherein the traction member is tensioned in such a manner that a tension pulley is installed adjacent to a top portion of the hoistway and/or a bottom portion of the hoistway, and the traction member is wound around the tension pulley.

5. The twin elevator based speed measurement device of claim 1 wherein the wrap angle of the traction member to at least one idler sheave in the same set of idler sheaves is greater than 180 degrees.

6. The twin-elevator based speed measuring device according to claim 1, wherein the number of traction members in the speed measuring device is only one.

7. The twin elevator based speed sensor of claim 1, wherein the sensor is mounted on idler wheels, at least one idler wheel of the same set of idler wheels having a sensor mounted thereon.

8. A twin elevator comprises two cars which are vertically arranged and run in the same shaft and a control system, and is characterized in that a speed measuring device as claimed in any one of claims 1 to 7 is further arranged in the twin elevator, and each sensor in the speed measuring device is respectively connected to the control system;

and the control system acquires the speed and/or position of each car according to the signals of the sensors and correspondingly controls the movement of each car.

9. A monitoring method of a twin elevator including two cars disposed vertically above and below and running in the same hoistway, characterized in that the twin elevator is further provided with a speed measuring device as set forth in any one of claims 1 to 7, the monitoring method comprising:

receiving signals from sensors on each car;

converting the signals into state information of each car, wherein the state information is related to the speed or the position of the corresponding car;

and judging the state information, and correspondingly operating when the state information of each car is inconsistent with the preset state information.

10. The monitoring method of a twin elevator according to claim 9, wherein judging the status information includes:

judging the distance between the two cars;

and when the distance between the two cages is smaller than a preset value, controlling at least one cage to decelerate or stop running.

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