EP3853164A1

EP3853164A1 - Lift car, lift installation, method for operating a lift installation and door drive

Info

Publication number: EP3853164A1
Application number: EP19766275.2A
Authority: EP
Inventors: Fabian VOGEL; Raphael ZIMMERMANN
Original assignee: Inventio AG
Current assignee: Inventio AG
Priority date: 2018-09-21
Filing date: 2019-09-17
Publication date: 2021-07-28
Anticipated expiration: 2039-09-17
Also published as: US20210309490A1; ES2968696T3; PL3853164T3; US11679960B2; EP3853164B1; AU2019344561B2; CN112805234A; WO2020058261A1; CN112805234B; AU2019344561A1

Abstract

The invention relates to a lift car (1) having at least one lift door (2), having a door drive (3) for actuating the lift door (2), having a sensor (4) for detecting the motor power of the door drive (3) and having an evaluating unit (5), which determines, based on the motor power detected, whether there is a deviation in the travel profile (6) from a reference travel profile (7). According to the invention, the evaluating unit (5) is designed to determine whether a deviation occurs due to an obstacle in contact with the lift door (2) or due to altered external conditions, particularly due to altered pressure conditions and/or air flow.

Description

Elevator car, elevator installation, method for operating an elevator installation and

Door operator

The invention relates to an elevator system, a method for operating an elevator system and a door drive according to the preambles of the independent claims.

Elevator cabs generally have elevator doors. These include at least one car door, which is connected to the elevator car. In addition, a plurality of shaft doors can be present, which are arranged on floors of a building and provide access to the shaft of the elevator.

When opening and closing, the car door and a shaft door are usually connected to one another via a coupling and moved together by the door drive that is usually attached to the elevator car.

In tall houses, considerable air resistance can act against the closing movement or opening movement of the cabin and shaft doors. This air resistance is due to the fact that air from outside the building penetrates the elevator shaft, which experiences a vertically directed flow due to the so-called chimney effect. In most cases, warm air rises in a chimney or in the elevator shaft. Chimney effects can also be caused by "falling" cold air.

The strength of the effect depends on the dimensions of the shaft and on changing external conditions such as the temperature, the wind speed or the

Air pressure.

The higher the speed of the air in the shaft due to the chimney effect, the more resistance is exerted on these elevator doors when the elevator doors are closed and / or opened. On extremely windy days, the air resistance can exceed the maximum closing force provided for the elevator doors. For this reason, closing the elevator doors is difficult or even impossible.

US3822767A teaches sensing the wind speed and prevailing in the shaft a proportional adjustment of the magnitude of the closing force of the door drive moving the elevator doors to the strength of the wind speed prevailing in the shaft.

A hindrance to opening and / or closing the elevator doors can also occur due to an obstacle located in the area of the elevator doors.

EP0976675 A1 discloses a system for operating an automatic elevator door with a door drive comprising a control, motor and drive mechanism, as well as an actual value detector for the generated or applied driving force. The driving force or motor force is the force applied by the motor to the door. The

Closing force or opening force is the force that is exerted on an obstacle by the door edge or door during a closing or opening process. A driving force model for the driving force uses a mathematical model and the door parameters to calculate the driving force to be applied in the case of interference-free operation. A limit value generator calculates from the driving force model value and a permissible one

Interference force a force limit. If the force limit is exceeded, the door is stopped and / or a reversing movement is triggered.

However, the system does not differentiate between obstacles and influences from external conditions. The force limit can be caused, for example, by the occurrence of the

Chimney effect are exceeded, after which a door can no longer be opened or closed.

The object is to provide an elevator car or an elevator installation or a method for operating such an elevator installation as well as door drives which overcome the disadvantages of the known and in particular allow operation in tall buildings.

The object is achieved by an elevator system with at least one elevator car, the elevator system comprising at least one elevator door and a door drive for

Operating the elevator door. The door drive includes in particular a control, a motor and a drive mechanism, via which drive mechanism the elevator door can be set in motion. The elevator installation, in particular the elevator car, comprises a sensor for detecting the driving force of the door drive. In particular, the sensor is one of them suitable to measure the motor current required to open and / or close the elevator door. The measurement is carried out in particular during the closing and / or opening time of the elevator door. The elevator installation further comprises an evaluation unit, which is designed such that it can be determined on the basis of the detected or measured drive force whether there is a deviation of the measured drive force from a reference drive force, the reference drive force being determined as a function of the floor.

The object is also achieved by a method for operating such an elevator system.

The object is also achieved by a door drive of such an elevator system, the door drive being designed to actuate the elevator door. The elevator installation usually comprises an elevator shaft arranged in a building. Such a building comprises several floors, which are connected by the elevator shaft. Accordingly, passengers of the elevator system can use the elevator system to get to different floors of the building. In an advantageous development of the invention, the elevator system, in particular the elevator car, comprises at least one sensor unit for measuring or detecting external conditions, in particular pressure conditions, temperature conditions, air currents and / or wind. Such a sensor unit can be used, for example, to record changes in the external conditions, in particular meteorological conditions, caused by the chimney effect. The sensor unit is preferably part of the door drive.

In particular, the sensor unit can also be arranged in such a way that at least one changed external situation is detected, which has a reinforcing or weakening effect on the chimney effect. For example, the chimney effect can increase or decrease when the outside temperature or prevailing wind speeds change, so that a previously defined reference driving force no longer corresponds to the current situation. The changed external conditions can occur due to changed pressure conditions and / or air currents, for example those which arise due to the chimney effect under changed meteorological conditions. By means of the sensor unit, for example, the pressure, the temperature and / or the wind speed can be measured, the corresponding external situation corresponding to the placement of the sensor unit in the elevator installation, for example on the elevator car, in particular on the elevator door. The at least one sensor unit can also be placed in such a way that the pressure in the elevator shaft or pressure differences along the elevator shaft, in other words wind conditions and / or temperatures, can be determined. The measurements, i.e. data collection, can be carried out at fixed time intervals, for example once a day, or continuously.

The sensor unit for detecting external conditions can be provided at one point in the elevator shaft and / or sensor units can be provided at several locations in the elevator shaft.

The evaluation unit is therefore preferably designed such that the measurement of the at least one detected external situation is taken into account when determining the floor-related reference driving force.

In a further development of the elevator system, the evaluation unit is designed in such a way that, when the external circumstances change, a corresponding other reference drive force that has already been stored is used or a re-determination of the reference drive force is triggered. Accordingly, it is possible that changed external conditions, which can lead, for example, to an increased chimney effect, are taken into account, so that with this increased chimney effect, a higher reference drive force for the elevator door can be effective.

In a further development of the elevator system, the evaluation unit is designed to define a floor-related reference driving force for each floor by means of a floor-related reference measurement of the driving force over the respective closing time and / or opening time and the at least one condition detected by means of the sensor unit. The measured values of the external conditions for the Determination of the reference drive force assigned to the elevator door is taken into account, so that, if necessary, reference drive forces can be corrected to higher values without a permissible closing force acting on an obstacle from the door leaf being exceeded.

The reference driving force is accordingly determined by means of the reference measurement of the driving force taking place over the respective closing and / or opening time. The reference driving force can be stored as a driving force curve over the closing and / or opening time or as a value or group of values, in particular as a pair of values. Such a value to be determined is typically greater in amount than the maximum of the measured driving force curve, that is, greater than the amount of the corresponding measured driving force curve. Or a pair of values is specified, the two values being above the two extremes of the measured driving force curve. An entire curve can also be saved, which corresponds to the pattern of the measured driving force curve.

The closing or opening time of the elevator door comprises the time required to move the door leaf (s) belonging to the elevator door from the open to the closed state of the elevator door or vice versa.

Accordingly, an updated reference driving force can be determined so that the reference driving force relating to the elevator door can be corrected to higher values without exceeding a permissible closing force acting on an obstacle from the door leaf. The measured values can be used, for example, to weight the specified reference drive forces and to define the weighted reference drive forces as new reference drive forces. For example, this means that a chimney effect expected to be stronger according to the measured values causes a higher new reference driving force. In addition, values relating to external conditions, in particular pressure ratios, temperature conditions, air currents and / or wind, can be recorded with which the reference driving forces of the respective floors are weighted in order to adapt the reference driving forces to changed external conditions without new measurements of the driving forces. The reference driving force for each floor is preferably determined and stored from a reference measurement carried out for this floor. Reference measurements can also be carried out only for at least one of the floors and the reference driving forces for the other floors can be calculated, in particular interpolated. In this way, a chimney effect that is always present to a certain extent is taken into account from the outset.

The measurements can be used, for example, when extrapolating or interpolating driving force measurements to individual floors to further reference driving forces on further floors.

The reference measurement and preferably the determination of the reference driving force can be carried out before the regular ferry service starts. The reference drive forces are preferably updated during the ferry operation, in order also to be able to do justice to slightly changing external conditions. For this purpose, further reference measurements can be carried out at regular time intervals or continuously during regular ferry operations for an update of the reference drive force for one of the elevator doors. Especially in high buildings, in which a strong chimney effect can occur, it makes sense to use floor-specific reference driving forces so that the elevator doors open and / or close at all when there is air resistance caused by the chimney effect. With a uniform reference drive force for all floors, the air resistance caused by the chimney effect can be considered an obstacle and consequently the movement, in particular the closing of the elevator door, is prevented from moving.

The reference driving force typically has different values, in particular for tall buildings, for different floors on which the elevator door is opened or closed.

The reference drive forces for the floors are or are preferably stored in the evaluation unit. In particular, the reference drive force can be via a Be set value that is compared with the maximum amount of the driving force curve, or via a pair of values that is compared with the two extremes of the driving force curve during the acceleration phase and the deceleration phase. Alternatively, the reference driving force can be defined as the reference driving force curve, which is compared with the course of the driving force over the closing and / or opening time. The driving force curve typically has different phases, namely an acceleration phase, a sliding phase and a braking phase. In a preferred embodiment of the invention, the elevator car comprises an adjusting unit, which is designed such that a stop or a reversing movement of the elevator door can be triggered due to a certain deviation of the measured driving force from the reference driving force. The actuating unit is preferably part of the door drive.

The data measured during normal operation of the elevator installation can be forwarded to the evaluation unit and / or to an adjustment unit, wherein the evaluation unit or the adjustment unit can be part of a central control of the elevator installation.

The evaluation unit is designed in such a way that the measured drive force is compared with the reference drive force of the corresponding elevator door. In contrast to a comparison with a floor-independent reference driving force, it can be decided according to the present method whether an increased driving force occurs due to an obstacle or a changed external situation. The latter is taken into account in a floor-dependent reference driving force, which is based on a measurement at different floors. Advantageously, the door is stopped and / or a reversing movement is triggered after a deviation of the measured driving force from the reference driving force is determined.

Such a deviation of the measured driving force from the reference driving force exists if at least one extreme value of the measured driving force curve exceeds the value of the reference driving force or at least one value of the reference driving force value pair or if the pattern of the measured driving force curve deviates strongly from the pattern of the reference driving force curve.

The evaluation unit is designed in particular to determine whether an obstacle is in contact with the elevator door. In addition to determining the driving force, the detection of external conditions can be taken into account when determining whether there is an obstacle.

In addition, with the aid of the measurements of the driving force, in particular if no stop and no reversing movement is triggered, an updated reference driving force can be determined, at least for the respective floor. With trouble-free operation, each measurement can be used on the one hand to check for an obstacle and on the other hand to update the reference driving force.

Alternatively or additionally, the measured values of the external circumstances can be stored together with the reference driving forces. The elevator door consists in particular of a car door and a shaft door, the car door being able to be coupled to the shaft door on one floor, so that the car door and the shaft door can be moved as an elevator door by the door drive. The elevator door can alternatively consist of a car door if the shaft door can be opened and closed, for example, separately and / or manually. Alternatively, the elevator door can consist of a shaft door. The car door or the shaft door each comprise at least one door leaf, which door leaf can be moved by the door drive between an open position and a closed position of the elevator door. The invention is explained below using examples shown in figures.

Show it:

Figure 1 is a schematic representation of an elevator system;

Figure 2 is a schematic representation of the chimney effect;

Figure 3: an exemplary diagram in which the motor current as for two floors Measure of the driving force is plotted over time.

FIG. 1 shows a schematic illustration of an elevator system 10. The elevator system 10 comprises an elevator shaft 12 and an elevator car 1.

The elevator car 1 comprises a car door 13 with two door leaves 2, the car door 13 being able to be coupled to one of a plurality of landing doors 14 at a given time. Each of these shaft doors 14 is arranged on one floor 15 each. According to FIG. 1 shown, an elevator door 2 consists of the car door 13 and the lower shaft door 14 coupled to the car door 13.

The elevator car 1 has a door drive 3 for actuating the car door 13 and the shaft door 14 coupled to the car door 13. In addition to the elevator car 1, it has a sensor 4 for detecting the motor power of the door drive 3 and an evaluation unit 5. The evaluation unit 5 enables a determination as to whether a detected maximum driving force 6a, 6b (see example in FIG. 3) deviates from a floor-dependent reference driving force 7a, 7b (see example in FIG. 3).

Since the reference driving force 7a, 7b is floor-dependent, it can be reliably decided whether there is an obstacle that is in contact with the elevator door 2.

The elevator car 1 comprises an adjusting unit 8. If the measured driving force 6a, 6b deviates from the reference driving force 7a, 7b, the adjusting unit 8 triggers a stop or a reversing movement of the elevator door 2.

The elevator car 1 comprises a sensor unit 9 for measuring pressure conditions, temperature conditions, air flows and / or wind. Alternatively or additionally, a sensor unit 11 for detecting external conditions, in particular pressure conditions, temperature conditions, air flows and / or wind, can be arranged on the elevator shaft 12. This means that the sensor unit 11 can optionally be arranged outside the elevator shaft 12 and the measured values obtained from the sensor unit 11 are taken into account when determining the at least one reference driving force 7a, 7b. An effect of the chimney effect is shown schematically in FIG. Since the elevator shaft 12 is typically in contact with the surroundings via the building doors and the elevator doors, warm air can penetrate into the shaft. This rises, which means that the elevator car 1 experiences a lower pressure in the lower region of the elevator shaft 12 than in the upper region of the elevator shaft 12.

FIG. 3 shows an exemplary diagram in which the motor current 1 is plotted for two floors as a measure of the driving force 6a, 6b over the time t, here over the length of the closing time 16.

The solid line corresponds to the driving force 6a on a middle floor. The dashed line corresponds to the driving force 6b on an upper floor, where the chimney effect comes into play. For the two floors, a reference driving force 7a, 7b can be determined from the time behavior of the driving force 6a via the maximum value. The reference driving force can be determined, for example, by multiplying the maximum amount by, for example, 1.1 or 1.2. The reference driving forces for the remaining floors can be determined in further measurements or extrapolated from these values 7a, 7b.

In normal operation, the elevator door is only stopped or a reversing movement is initiated if the driving force exceeds the reference driving force for the respective floor.

Alternatively, the reference driving force can also be stored as a pattern of the driving force behavior over time. A stop or a reversing movement takes place if the curves deviate. For this purpose, a standard for the characterization of the deviation and a corresponding limit value are defined. Soft obstacles can also be taken into account when deciding on the deviation of the curve pattern.

In addition, values relating to external conditions, in particular pressure ratio sen, temperature conditions, air currents and / or wind are recorded with which the reference driving forces of the respective floors are weighted in order to adapt the reference driving forces to new external conditions without new measurements of the driving forces.

Claims

1. elevator system (10) with at least one elevator car (1), the elevator system (10) comprising at least one elevator door (2) and at least one door drive (3) for actuating the at least one elevator door (2), the door drive (3) showing:

- at least one sensor (4) for detecting a driving force of a door drive (3) of the elevator system (10), in particular for detecting the motor current,

- At least one sensor unit (9) for detecting at least one external situation, in particular of pressure conditions, temperature conditions, air currents and / or wind, and

- An evaluation unit (5) which is designed to determine on the basis of the detected drive force whether there is a deviation, in particular an overshoot, of the measured drive force (6a, 6b) from a reference drive force (7a, 7b), where the Reference driving force (7a, 7b) is determined by means of a reference measurement carried out by means of the sensor (4) and as a function of the floor (15), the evaluation unit (5) being designed in such a way that the at least one detected external condition when determining the Floor-dependent reference driving force (7a, 7b) must be taken into account.

2. Elevator system (10) according to claim 1, wherein the elevator system (10), in particular the elevator car (1), comprises an adjustment unit (8) and the evaluation unit (5) and / or the adjustment unit (8) are designed such that at If the measured driving force (6a, 6b) is exceeded by the reference driving force (7a, 7b), a stop or a reversing movement of the elevator door (2) can be triggered.

3. Elevator system (10) according to any one of the preceding claims, wherein the Sensorein unit (9) on the elevator car (1) is fixed.

4. Elevator system (10) according to one of claims 1 and 2, comprising an elevator shaft, wherein the sensor unit (9) is fixed in the elevator shaft.

5. Elevator system (10) according to one of the preceding claims, wherein the evaluation unit (5) is designed for each, a floor-related reference driving force for each floor (15) by means of: - A floor-related reference measurement of the driving force over the respective closing time (16) and / or opening time, and

- The at least one condition detected by means of the sensor unit (9)

to be determined.

6. elevator system (10) according to any one of the preceding claims, wherein the Auswer teeinheit (5) is designed such that when a change in the external conditions a corresponding other already stored reference driving force is used or a redefinition of the reference driving force is triggered.

7. elevator system (10) according to any one of the preceding claims, wherein the Auswer teeinheit (5) is designed to determine whether an obstacle is in contact with the elevator door (2).

8. elevator system (10) according to any one of the preceding claims, wherein the Auswer teeinheit (5) is designed such that

- The driving force detected for the elevator door (2) arranged on a floor (15) or the reference driving force (7a, 7b) determined for this elevator door, and

- The condition detected by means of the sensor unit (9)

is used or can be used to calculate the reference driving force of at least one further floor (15).

9. elevator system (10) according to any one of the preceding claims, wherein the Auswer teeinheit (5) is designed such that the reference driving force in the evaluation unit (5) can be stored, the reference driving force as a reference drive curve or as

Value is formed.

10. A method for operating an elevator system (10), in particular according to one of claims 1 to 7, comprising

- Detection of a floor-related driving force, in particular the motor current, of a door drive (3) by means of a sensor,

- detection of an external situation by means of a sensor unit (9) intended for this,

- Determining a reference driving force (7a, 7b) per floor (15) with the aid of at least at least a reference measurement of the driving force (6a, 6b) and the detected external situation.

11. The method according to claim 10, wherein the determination of the reference driving force (7a, 7b)

on more than one floor (15) over the respective closing time (16) and / or opening time.

12. The method according to any one of claims 10 and 11, comprising

- Measuring the driving force (6a), in particular the motor current, for opening and / or

Closing at least one elevator door with a sensor (4) during an opening and / or closing operation carried out in normal operation,

- Comparison of the measured driving force (6a, 6b) with the reference driving force (7a, 7b).

13. The method according to claim 12, wherein after determining an exceeding of the measured driving force of the reference driving force, the door is stopped and / or a reverse movement is triggered.

14. Door drive for operating an elevator door (2), with a sensor (4) for detecting the driving force (6a, 6b) of the door drive (3), with an evaluation unit (5) which determines on the basis of the detected driving force (6a, 6b) whether there is a deviation from a reference driving force (7a, 7b),

characterized in that

the evaluation unit (5) is designed for this, the reference driving force (7a, 7b) for each

Floor (15) with the help of at least one reference measurement of the driving force (6a, 6b) on more than one floor (15) over the respective closing time (16) and / or opening time.