Elevator landing door device

Abstract

The invention discloses an elevator landing door device which comprises an upper ridge frame, a guide rail, a driving side door hanging plate, a driven side door hanging plate, a landing door lock, a landing door ball and a forced door closing device. The device further comprises a motor, a controller, a first signal switch, a second signal switch and a transmission device. When the first signal switch is switched on and the second signal switch is not switched on, the motor is controlled to output torque in the door closing direction; when the second signal switch is switched on, the output torque of the motor is controlled to be reduced to zero; the first signal switch is arranged on the upper ridge frame, and the position of the first signal switch is set, so that the first signal switch is switched on within a preset stroke before the landing door is fully closed; the preset stroke is a tail section stroke when the car door knife does not apply door closing force to the landing door ball in the door closing process; and the second signal switch is arranged on the upper ridge frame, and the position of the second signal switch is set, so that the second signal switch is switched on after the landing door is fully closed. The problem of synchronism when the landing door motor and the car door motor are driven at the same time can be solved.

Description

Technical Field

[0001] This invention relates to the field of elevator technology, and more specifically to an elevator landing door device. Background Technology

[0002] Elevator landing doors are typically equipped with counterweights or springs to force closing the doors. However, due to the chimney effect in high-rise buildings, when wind pressure is high, the air pressure entering and exiting the shaft can force the landing doors to close automatically due to wind resistance. This results in the landing doors failing to close and the elevator failing to start operating.

[0003] To address the aforementioned issues, Chinese patent document (CN111689353B) discloses an elevator landing door device. By coordinating the landing door safety circuit and the car door safety circuit, when the landing door is detected to be not fully closed, the control motor rotates in the closing direction to drive the landing door to close. However, this technical solution significantly increases the closing time, resulting in a poor experience for passengers.

[0004] In addition, some existing technologies use motors to assist in closing the landing door by adding motors to the landing door mechanism. However, the elevator control cabinet usually sends door opening and closing command signals to both the car door controller and the landing door controller simultaneously. Since the landing door is driven by the car door when opening and closing, a high degree of synchronization is required between the landing door motor and the car door motor. Poor synchronization can cause shaking during door opening and closing, and in severe cases, it can even hinder the closing of the landing door. Summary of the Invention

[0005] The technical problem to be solved by this invention is how to avoid the synchronization problem when the landing door motor and the car door motor are driven simultaneously.

[0006] To solve the above-mentioned technical problems, the present invention provides an elevator landing door device, including an upper sill, a guide rail, a drive side door mounting plate, a driven side door mounting plate, a landing door lock, a landing door ball, and a forced closing device; the landing door ball is disposed on the drive side door mounting plate. The elevator landing door device also includes a motor, a controller, a first signal switch, a second signal switch, and a transmission device; the motor is mounted on the upper sill and is connected to the drive side door mounting plate and the driven side door mounting plate through the transmission device; The controller controls the torque output of the motor; when the first signal switch is on and the second signal switch is off, it controls the motor to output torque in the closing direction; when the second signal switch is on, it controls the motor to reduce the output torque to zero. The first signal switch is set on the upper sill frame. The position of the first signal switch is set so that the first signal switch is turned on within a preset travel distance before the landing door is fully closed. The preset travel distance is the last part of the travel distance during the closing process when the car door knife does not apply closing force to the landing door ball. The second signal switch is installed on the upper sill, and its position is set so that the second signal switch is turned on after the floor door is fully closed.

[0007] Preferably, the drive side door mounting plate or the driven side door mounting plate is provided with a first impact bow, which is used to trigger the connection of the first signal switch.

[0008] Preferably, the elevator landing door device further includes a landing door speed sensor for detecting the speed of the landing door when it closes; when the first signal switch is turned on, if the landing door speed is lower than the speed threshold, the controller controls the motor to output a second torque in the closing direction, otherwise the controller controls the motor to output a first torque in the closing direction; the second torque is greater than the first torque.

[0009] Preferably, the elevator landing door device further includes a landing door speed sensor for detecting the speed of the landing door when it closes; when the first signal switch is turned on, the controller controls the motor to output a torque value in the closing direction according to the landing door speed, and the lower the landing door speed, the greater the torque value.

[0010] Preferably, the door speed sensor is an encoder mounted on the motor.

[0011] Preferably, the elevator landing door device further includes a fully open signal switch, which is installed on the upper sill. The position of the fully open signal switch is such that it is activated when the landing door is in the fully open position.

[0012] Preferably, the drive side door mounting plate or the driven side door mounting plate is provided with a second impact bow, which is used to trigger the connection of the fully open signal switch.

[0013] Preferably, when the fully open signal switch is turned on, the controller controls the motor to output torque in the opening direction.

[0014] Preferably, when the second signal switch is turned on, the output torque of the control motor is gradually reduced to zero within a preset time.

[0015] Preferably, the preset time ranges from 2 to 5 seconds.

[0016] Compared with the prior art, the present invention has the following advantages: 1. Taking advantage of the characteristic that the asynchronous car door knife does not generate clamping force on the landing door ball during the last stroke, the landing door motor is started only in this area. At this time, the closing action of the landing door is not affected by the power of the car door, and the movement is not disturbed by the car door. In this way, it is not necessary to maintain synchronization with the car door motor, which effectively solves the problem of door shaking caused by poor synchronization between the landing door motor and the car door motor. 2. The landing door motor is started directly at the end of the closing stroke to assist in closing the door. There is no need to wait for the delay judgment result of the safety circuit after the landing door cannot be fully closed before starting the landing door motor. This makes the entire closing process conform to the normal preset closing curve and closing time, providing passengers with a better experience. 3. Start the landing door motor in the last stage of the stroke. When the landing door starts to close, this acceleration process will give the landing door a certain kinetic energy at the end of the stroke. This will give the landing door lock the initial kinetic energy to the fixed hook at the end of the stroke, making the action of rotating the hook to climb the slope more reliable. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the elevator landing door device structure in Embodiment 1; Figure 2 This is a partially enlarged structural schematic diagram of the elevator landing door device in Embodiment 1. Detailed Implementation

[0018] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can fully understand other advantages and technical effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments, and the details in this specification can also be applied based on different viewpoints, with various modifications or changes made without departing from the overall design concept of the invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. The following exemplary embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art. Example 1

[0019] like Figure 1 and Figure 2 As shown, this embodiment provides an elevator landing door device, including an upper sill frame 7, a guide rail 8, a drive side door mounting plate 11, a driven side door mounting plate 12, a landing door lock 10, a landing door ball 9, and a forced closing device; the landing door ball 9 is mounted on the drive side door mounting plate 11.

[0020] The elevator landing door device also includes a motor 1, a controller 2, a first signal switch 19, a second signal switch 20, and a transmission device; the motor 1 is mounted on the upper sill 7 and is connected to the drive side door hanging plate 11 and the driven side door hanging plate 12 through the transmission device.

[0021] The guide rail 8 can be integrally formed with the upper sill frame 7, or it can be independently fixed on the upper sill frame 7. The drive side door hanging plate 11 and the driven side door hanging plate 12 are each provided with two hanging wheels; the drive side door hanging plate 11 and the driven side door hanging plate 12 slide linearly along the guide rail 8 through the hanging wheels.

[0022] The transmission device includes a synchronous belt 3, a driven synchronous pulley 4, a motor-side drive pulley 5, a drive-side boom 6, and a driven-side boom 18.

[0023] The upper sill 7 has a driven-side synchronous pulley 4 and a motor-side drive pulley 5 at each end. The synchronous belt 3 passes over the driven-side synchronous pulley 4 and the motor-side drive pulley 5, respectively. The upper and lower parts of the synchronous belt 3 are connected to the drive-side door hanging plate 11 and the driven-side door hanging plate 12 via the drive-side boom 6 and the driven-side boom 18, respectively. The counterweight-type forced closing device is connected to at least one door hanging plate. A guide wheel for the counterweight-type forced closing device is installed on one door hanging plate, and the counterweight wire rope passes over the guide wheel and is connected to the wire rope fixing member of the other door hanging plate. Alternatively, a spring can be installed on one door hanging plate, with the other end of the spring installed on the upper sill 7, serving as a spring-type forced closing device. Door full-opening prevention devices are installed at the far ends of both sides of the guide rail 8 to prevent the landing door from opening too wide and derailing from the track.

[0024] Motor 1 is a thin permanent magnet synchronous motor, which transmits power to the drive pulley 5 on the motor side via a key. Controller 2 controls this motor.

[0025] In the elevator system, an elevator landing door device of this embodiment is installed above each floor entrance / exit in the elevator shaft. The upper end of the landing door is mounted on the drive-side door mounting plate 11 and the driven-side door mounting plate 12, and the lower end of the landing door is limited and guided by a sill. When the elevator door closes, the car door side motor drives the car door to move in the closing direction, and the car door door knife applies a closing force to the landing door ball 9 to drive the landing door to close.

[0026] To avoid synchronization issues when the landing door motor and the car door motor are driven simultaneously, in this embodiment, the controller controls the motor's torque output. When the first signal switch 19 is on and the second signal switch 20 is off, the controller controls the motor to output torque in the closing direction. When the second signal switch 20 is on, the controller controls the motor's output torque to decrease to zero. When the first signal switch 19 is off, the motor does not output torque.

[0027] The first signal switch 19 is mounted on the upper sill 7. The position of the first signal switch 19 is such that it is activated within a preset travel distance before the landing door is fully closed. This preset travel distance is the final segment of the travel distance during the closing process where the car door knife does not apply closing force to the landing door ball 9. The preset travel distance is typically the last few centimeters of the landing door's closing stroke. When the landing door reaches this position, the first signal switch 19 is triggered and sends a signal to the controller.

[0028] In this embodiment, a first impact bow 13 is provided on the driven side door hanging plate 12. The first impact bow 13 is used to trigger the connection of the first signal switch 19. When the first signal switch 19 is connected, and during the subsequent door closing process, the actuation wheel of the first signal switch 19 always rides on the first impact bow 13, keeping the first signal switch 19 always connected.

[0029] The second signal switch 20 is mounted on the upper sill 7. The position of the second signal switch 20 is such that it is activated after the landing door is fully closed. In this embodiment, the second signal switch 20 is, for example, a pin switch. A pin switch is typically activated 5-7mm before the door is fully closed. When this pin switch is activated, it outputs a signal that the landing door is completely closed.

[0030] The elevator landing door device in this embodiment is applied to an asynchronous door-operated elevator door system. In this system, the car door moves before the landing door, and closes earlier than the landing door during the closing process. Therefore, at the end of the landing door's closing stroke, the car door knife does not apply closing force to the landing door ball 9. This embodiment controls the landing door device motor to output closing torque only at the end of the stroke, and not output torque during the earlier strokes, only rotating as needed. This ensures that the torques output by the landing door device motor and the car door motor do not act on the landing door simultaneously during the closing process, avoiding the synchronization problem when the landing door device motor and the car door motor are driven simultaneously.

[0031] In this embodiment, the preset stroke (i.e., the final stroke) can be set to 70-80mm based on the following analysis: The car door knife typically stops applying closing force to the landing door ball bearing 9 when the car door is 90-100mm away from full closing. Since the car door travels 20mm more than the landing door, the landing door still has 70-80mm of travel left before it is fully closed. The switching travel of the first signal switch 19 is generally 7-10mm. Thus, the initial contact time between the first signal switch 19 and the first impact bow 13 is within the range of 77-90mm before the landing door is fully closed. To allow sufficient calculation time for the controller, the relative positions of the first signal switch 19 and the first impact bow 13 can be adjusted so that the first impact bow 13 contacts the first signal switch 19 when the landing door is 90mm away from full closing.

[0032] Preferably, when the second signal switch is turned on, the output torque of the control motor is gradually reduced to zero within a preset time. The preset time ranges from 2 to 5 seconds.

[0033] Preferably, once the controller receives a cancellation of the door closing command, it controls the motor to cut off the torque output.

[0034] Preferably, the elevator landing door device further includes a landing door speed sensor for detecting the speed of the landing door when it closes. The landing door speed sensor is an encoder mounted on the motor. The encoder can monitor the motor's rotation speed, rotation direction, and the initial and fully open positions of the landing door.

[0035] When the first signal switch 19 is turned on, the magnitude of the motor output torque can be controlled by detecting the speed of the landing door.

[0036] For example, if the landing door speed is below a speed threshold, the controller controls the motor to output a second torque in the closing direction; otherwise, the controller controls the motor to output a first torque in the closing direction. The second torque is greater than the first torque. The second torque, converted to a horizontal force, is 12 to 15 kg; the first torque, converted to a horizontal force, is 5 to 8 kg. The speed threshold can be converted to the motor speed through the transmission ratio. This adaptive control method ensures that the landing door can close smoothly at an appropriate speed, avoiding problems such as incomplete closing or excessively slow closing speed due to excessive resistance.

[0037] For example, the controller controls the torque value of the motor output in the closing direction based on the door speed. The lower the door speed, the greater the torque value, thereby achieving more precise speed control and improving the smoothness and reliability of door closing.

[0038] Preferably, the elevator landing door device further includes a fully open signal switch 22, which is installed on the upper sill 7. The position of the fully open signal switch 22 is such that when the landing door is in the fully open position, the fully open signal switch 22 is turned on.

[0039] A second impact bow 23 is installed on the drive side door mounting plate 11. The second impact bow 23 is used to trigger the full-open signal switch 22. For example, when the landing door is 9mm before full opening, the second impact bow 23 triggers the full-open signal switch 22. The full-open signal is input to the elevator control cabinet, causing the elevator control cabinet to issue different management commands. For example, if the counterweight added to the landing door device to resist wind pressure is relatively heavy, when the landing door is fully open, in order to keep the door fully open, the car door motor will provide a certain torque. In order to reduce the heat generation of the car door motor, when the full-open signal switch 22 is turned on, the controller controls the motor to output torque in the opening direction, so that the landing door will not be easily dragged back in the closing direction by the counterweight force, reducing the current output of the car door motor, thereby reducing the heat generation of the car door motor.

[0040] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. An elevator landing door device, comprising a landing door frame, a guide rail, a driving side door hanger, a driven side door hanger, a landing door lock, a landing door ball and a forced closing device; the landing door ball is arranged on the driving side door hanger; characterized in that the elevator landing door device further comprises a motor, a controller, a first signal switch, a second signal switch and a transmission device; the motor is arranged on the landing door frame and connected with the driving side door hanger and the driven side door hanger through the transmission device; the controller controls the torque output of the motor; when the first signal switch is turned on and the second signal switch is not turned on, the controller controls the motor to output torque in the closing direction; when the second signal switch is turned on, the controller controls the motor to reduce the torque to zero; the first signal switch is arranged on the landing door frame, and the position of the first signal switch is arranged so that the first signal switch is turned on within a preset stroke before the landing door is fully closed; the preset stroke is the final stroke in which the car door blade does not exert closing force on the landing door ball during the closing process; the second signal switch is arranged on the landing door frame, and the position of the second signal switch is arranged so that the second signal switch is turned on after the landing door is fully closed.

2. The elevator landing door arrangement according to claim 1, characterized in that a first striking arc is arranged on the driving side door hanger or the driven side door hanger, and the first striking arc is used to trigger the turning on of the first signal switch.

3. The elevator landing door arrangement according to claim 1, characterized in that the elevator landing door device further comprises a landing door speed sensor for detecting the speed of the landing door during closing; when the first signal switch is turned on, if the speed of the landing door is lower than a speed threshold, the controller controls the motor to output a second torque in the closing direction, otherwise the controller controls the motor to output a first torque in the closing direction; the second torque is greater than the first torque.

4. The elevator landing door arrangement according to claim 1, characterized in that the elevator landing door device further comprises a landing door speed sensor for detecting the speed of the landing door during closing; when the first signal switch is turned on, the controller controls the torque value in the closing direction of the motor according to the speed of the landing door; the lower the speed of the landing door, the greater the torque value.

5. Elevator landing door arrangement according to claim 3 or 4, characterized in that the landing door speed sensor is an encoder mounted on the motor.

6. The elevator landing door arrangement according to claim 1, characterized in that the elevator landing door device further comprises a fully open signal switch, which is arranged on the landing door frame, and the position of the fully open signal switch is arranged so that the fully open signal switch is turned on when the landing door is in the fully open position.

7. The elevator landing door arrangement according to claim 5, characterized in that a second striking arc is arranged on the driving side door hanger or the driven side door hanger, and the second striking arc is used to trigger the turning on of the fully open signal switch.

8. Elevator landing door arrangement according to claim 6 or 7, characterized in that when the fully open signal switch is turned on, the controller controls the motor to output torque in the opening direction.

9. The elevator landing door arrangement according to claim 1, characterized in that when the second signal switch is turned on, the controller controls the motor to gradually reduce the torque to zero within a preset time.

10. An elevator landing door arrangement according to claim 9, characterized in that the preset time ranges from 2 to 5 seconds.

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