A system for automatically adjusting the dynamic balance of an elevator

Abstract

The application discloses a system for automatically adjusting the dynamic balance of an elevator, comprising: a tilt detection unit for detecting the tilt state of an elevator car in real time; a counterweight adjusting device arranged at the bottom of the car, the counterweight adjusting device comprising a sliding counterweight block and a driving mechanism for driving the sliding counterweight block to move, for adjusting the center of gravity of the elevator car by moving the sliding counterweight block; a control unit connected with the tilt detection unit and the driving mechanism of the counterweight adjusting device, and in communication with an elevator main control unit; the control unit is used for controlling the driving mechanism to move the sliding counterweight block to reduce the tilt of the elevator car when the preset condition is met according to the tilt state of the elevator car obtained from the tilt detection unit. The application can monitor and reduce the tilt of the car in real time during the operation of the elevator, thereby significantly improving the alignment between the car door and the landing door, effectively avoiding the hard impact of the door system, and fundamentally preventing the door system failure and potential safety accidents caused by the tilt.

Description

Technical Field

[0001] This invention relates to the field of elevator technology, and more specifically to a system for automatically adjusting the dynamic balance of an elevator. Background Technology

[0002] As a vital vertical transportation tool for carrying passengers and goods, the operational safety and stability of traction elevators are of paramount importance. However, throughout the elevator's lifespan, car tilting is a prevalent and difficult-to-solve technical problem. This tilting can be caused by various factors, such as interior decoration, flooring installation, and uneven weight distribution, all of which can disrupt the elevator's original static balance at the time of manufacture. Furthermore, during long-term operation, continuous wear of the guide shoes leads to increased clearance on one side of the car's support, resulting in persistent tilting. More importantly, uneven passenger distribution or one-sided stacking of heavy objects within the car creates dynamic off-center loading, causing continuous changes in the car's tilt angle during operation.

[0003] Tilting of the elevator car not only affects the passenger experience but can also lead to serious safety accidents. When the car tilts, the alignment between the car door and the landing door is affected, potentially causing a hard impact on the door system. This impact can easily cause door deformation, door lock failure, and door jamming, and in severe cases, it can even lead to high-risk accidents such as people being trapped or falling into the elevator. Traditional elevator maintenance methods mainly rely on a one-time static balancing test during the factory installation stage. This static test cannot adapt to the constantly changing tilting factors throughout the elevator's life cycle. Once the car tilts, traditional solutions usually require stopping the elevator for manual leveling, which is not only time-consuming and labor-intensive but also cannot be corrected in real time during elevator operation, nor can it proactively prevent door impact accidents. Therefore, existing technology urgently needs improvement. Summary of the Invention

[0004] This invention discloses an automatic elevator dynamic balance adjustment system, which aims to solve the technical problems of reduced operational safety and stability caused by elevator car tilting, and the inability of traditional maintenance methods to correct and prevent door impact accidents in real time.

[0005] The technical solution of the present invention is as follows: A system for automatically adjusting the dynamic balance of an elevator, comprising: The tilt detection unit is used to detect the tilt status of the elevator car in real time. A counterweight adjustment device is installed at the bottom of the elevator car. The counterweight adjustment device includes a sliding counterweight block and a drive mechanism for moving the sliding counterweight block, which is used to adjust the center of gravity of the elevator car by moving the sliding counterweight block. The control unit is connected to the drive mechanism of the tilt detection unit and the counterweight adjustment device, and communicates with the elevator main control unit. The control unit is configured to control the drive mechanism to move the sliding counterweight block to reduce the tilt of the elevator car when a preset condition is met, based on the tilt state of the elevator car obtained from the tilt detection unit.

[0006] Furthermore, the preset conditions include the elevator car tilt being greater than a first threshold and the elevator car tilt being greater than a second threshold, wherein the second threshold is greater than the first threshold; The control unit is used to control the drive mechanism to move the sliding counterweight when the elevator car is in a level opening state and the tilt is greater than the first threshold. And when the elevator car is in operation and the tilt is greater than the second threshold, a command is sent to the elevator main control unit to control the elevator car to level with the nearest floor, and after leveling, the drive mechanism is controlled to move the sliding counterweight.

[0007] Furthermore, the first threshold is a tilt angle of 1°, and the second threshold is a tilt angle of 3°.

[0008] Furthermore, the control unit is also used to send a leveling completion signal to the elevator main control unit after the elevator car completes the movement of the sliding counterweight in the leveled and open state; after receiving the leveling completion signal, the elevator main control unit allows the elevator car to close and start.

[0009] Furthermore, the control unit is also used to disable control of the drive mechanism when it receives a signal from the elevator main control unit indicating that the elevator is in maintenance mode or in a fault shutdown state.

[0010] Furthermore, the counterweight adjustment device includes four sets, which are disposed at the four corners of the car bottom; each set of the counterweight adjustment device includes a drive motor, a transmission screw fixed coaxially with the output end of the drive motor, a sliding counterweight block threaded onto the transmission screw, and a guide rail for guiding the movement of the sliding counterweight block; the drive motor and the transmission screw constitute the drive mechanism.

[0011] Furthermore, the control unit includes: The communication interaction unit is used to receive the elevator operating status signal sent by the elevator main control unit, and to send car tilt data and leveling completion signal to the elevator main control unit. The data parsing unit is used to perform threshold determination on the tilt state obtained from the tilt detection unit; The motor drive control unit is used to control the drive mechanism according to the determination result of the data parsing unit.

[0012] Furthermore, the tilt detection unit is an angle sensor, which is fixedly installed at the center of the car bottom.

[0013] Furthermore, the control unit communicates with the elevator main control unit via a CAN bus.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention acquires the car's tilt state in real time through a tilt detection unit, and the control unit controls the counterweight adjustment device to move the sliding counterweight block according to preset conditions, thereby dynamically adjusting the car's center of gravity. This effectively solves the problem that traditional methods cannot adapt to the constantly changing tilting causes throughout the elevator's entire life cycle.

[0015] This invention can monitor and reduce car tilt in real time during elevator operation, thereby significantly improving the alignment between the car door and the landing door, effectively avoiding hard impacts on the door system, and fundamentally preventing door system failures and potential safety accidents caused by tilt. Through this technical solution, the operational safety and stability of the elevator are significantly improved, and the passenger experience is also enhanced, avoiding the inconvenience and high costs of manual leveling during traditional solutions. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the principle of the present invention; Figure 3 This is a circuit diagram of the present invention; Figure 4 This is the control logic diagram of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] To illustrate the technical solution described in this invention, specific embodiments are described below.

[0020] Example See Figures 1-4This embodiment provides a system for automatically adjusting the dynamic balance of an elevator, which mainly includes a tilt detection unit 1, a counterweight adjustment device 2, and a control unit 3. The tilt detection unit 1 is used to detect the tilt state of the elevator car in real time. The counterweight adjustment device 2 is disposed at the bottom of the car and includes a sliding counterweight block 23 and a drive mechanism for moving the sliding counterweight block 23. Its function is to adjust the center of gravity of the elevator car by moving the sliding counterweight block 23. The control unit 3 is connected to the tilt detection unit 1 and the drive mechanism of the counterweight adjustment device 2, and communicates with the elevator main control unit. Based on the tilt state of the elevator car obtained from the tilt detection unit 1, the control unit 3 controls the drive mechanism to move the sliding counterweight block 23 when preset conditions are met, thereby reducing the tilt of the elevator car.

[0021] This system, by introducing a tilt detection unit 1 and a counterweight adjustment device 2, achieves real-time monitoring and automatic adjustment of the elevator car's tilt status. This dynamic leveling mechanism effectively solves tilting problems caused by car uneven loading and guide shoe wear, preventing high-risk malfunctions such as door system impact, deformation, and failure due to tilt from the source, thus significantly improving elevator operation safety. Furthermore, the system achieves a fully automatic, unattended leveling process, eliminating the need for regular manual adjustments by maintenance personnel, significantly reducing maintenance costs and elevator downtime frequency, and improving elevator operating efficiency and user experience.

[0022] Specifically, the tilt detection unit 1 employs a high-precision angle sensor, such as a MEMS (Micro-Electro-Mechanical Systems) tilt sensor or an electrolyte tilt sensor, which can measure the tilt angle of the elevator car in the lateral and longitudinal directions in real time and accurately. This angle sensor is preferably fixedly installed at the center of the car floor to ensure that the acquired tilt data is representative. When the elevator car tilts during operation due to uneven passenger distribution, unbalanced cargo loading, or guide rail wear, the tilt detection unit 1 immediately senses this change and sends the real-time tilt status data to the control unit.

[0023] The counterweight adjustment device 2 is the core component for adjusting the car's center of gravity. This device is located at the bottom of the car and can be configured as a single or multiple sets according to actual needs. In this embodiment, the counterweight adjustment device 2 includes four sets, each located at one of the four corners of the car bottom, to achieve comprehensive adjustment of the car's lateral and longitudinal tilt. Each set of counterweight adjustment devices 2 specifically includes a drive motor 21, a transmission screw coaxially fixed to the output end of the drive motor 21, a sliding counterweight block 23 threaded onto the transmission screw, and a guide rail 24 for guiding the movement of the sliding counterweight block 23; the drive motor 21 and the transmission screw constitute the drive mechanism. The drive motor 21 can be a stepper motor or a servo motor, which can precisely control the rotation of the transmission screw, thereby driving the sliding counterweight block 23 to move along the guide rail. The guide rail 24 guides the movement direction of the sliding counterweight block 23, ensuring its smooth operation along a preset path. By controlling the movement of the sliding counterweight block 23 at different positions, the force distribution at the bottom of the car can be changed, thereby adjusting the car's center of gravity and restoring it to a horizontal state.

[0024] Control unit 3 is the "brain" of the entire system, responsible for coordinating and controlling the operation of various components. Control unit 3 is connected to tilt detection unit 1 via wired or wireless means to receive real-time car tilt data. Simultaneously, control unit 3 is also connected to the drive mechanism of counterweight adjustment device 2 to issue control commands when needed, driving the sliding counterweight block 23 to move. Furthermore, control unit 1 communicates with the elevator main control unit, exchanging data via the CAN bus to obtain elevator operating status information (such as leveling and door opening, running, maintenance mode, or fault stop), and sends leveling completion signals or emergency stop commands to the elevator main control unit.

[0025] In actual operation, the control unit 3 continuously receives car tilt status data sent by the tilt detection unit 1. When car tilt is detected, the control unit 3 makes a judgment based on preset conditions. These preset conditions may include tilt angle thresholds, elevator operating status, etc.

[0026] Specifically, the preset conditions include the elevator car tilt being greater than a first threshold and the elevator car tilt being greater than a second threshold, wherein the second threshold is greater than the first threshold. The control unit 3 is configured to control the drive mechanism to move the counterweight when the elevator car is in a level, open-door state and the tilt is greater than the first threshold. Simultaneously, when the elevator car is in operation and the tilt is greater than the second threshold, the control unit 3 sends a command to the elevator main control unit to control the elevator car to level near the nearest floor, and then controls the drive mechanism to move the counterweight after leveling.

[0027] By introducing two different tilt thresholds and response strategies for different operating states, the differentiated needs for tilt adjustment at different stages of elevator operation are effectively addressed. When the elevator car is in the leveled, door-opening state, the center of gravity of the car may change due to passenger entry and exit, causing a slight tilt. If the tilt exceeds the first threshold, the control unit 3 immediately controls the drive mechanism to move the counterweight for real-time fine-tuning, quickly restoring the car's balance without affecting passenger experience. This instant adjustment mechanism ensures the smoothness of passengers entering and exiting the elevator. On the other hand, when the elevator car is in operation, if the tilt exceeds the more stringent second threshold, it usually indicates a more serious dynamic balance problem. In this case, to prioritize passenger safety, the control unit 3 does not immediately adjust the counterweight but first sends a command to the elevator main control unit to level the elevator car at the nearest floor. After the elevator car safely stops and levels, the control unit 3 then controls the drive mechanism to move the sliding counterweight 23 for precise balance adjustment. This phased response mechanism avoids the impact and risks that may arise from counterweight adjustment during high-speed operation, greatly improving the safety of elevator operation.

[0028] The first threshold is set to a tilt angle of 1°, and the second threshold is set to a tilt angle of 3°. When the elevator car opens at a level landing, if the tilt angle exceeds 1°, the system will initiate counterweight adjustment. When the elevator car is in operation, if the tilt angle exceeds 3°, the system will first instruct the elevator to level with the nearest landing, and then perform counterweight adjustment after leveling.

[0029] Furthermore, after the counterweight has moved while the elevator car is level and the doors are open, the control unit 3 sends a leveling completion signal to the elevator main control unit. Upon receiving the leveling completion signal, the elevator main control unit allows the elevator car to close and start. This setting ensures that the elevator can quickly enter the door-closing and starting process after completing dynamic balance adjustment, significantly improving the elevator's operating efficiency and response speed.

[0030] Furthermore, the control unit 3 is also used to shield the control of the drive mechanism when it receives a signal from the elevator main control unit indicating that the elevator is in maintenance mode or in a fault shutdown state. This shielding mechanism ensures that the counterweight adjustment device will not be accidentally triggered or perform unnecessary actions under these special operating conditions, thus ensuring the safety and stability of the elevator under special operating conditions.

[0031] Specifically, the control unit 3 includes a communication interaction unit, a data parsing unit, and a motor drive control unit. The communication interaction unit receives elevator operating status signals from the elevator main control unit and sends car tilt data and leveling completion signals to the elevator main control unit. The data parsing unit performs threshold determination on the tilt status obtained from the tilt detection unit. The motor drive control unit controls the drive mechanism based on the determination result of the data parsing unit.

[0032] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A system for automatically adjusting the dynamic balance of an elevator, characterized in that, include: The tilt detection unit is used to detect the tilt status of the elevator car in real time. A counterweight adjustment device is installed at the bottom of the elevator car. The counterweight adjustment device includes a sliding counterweight block and a drive mechanism for moving the sliding counterweight block, which is used to adjust the center of gravity of the elevator car by moving the sliding counterweight block. The control unit is connected to the drive mechanism of the tilt detection unit and the counterweight adjustment device, and communicates with the elevator main control unit. The control unit is configured to control the drive mechanism to move the sliding counterweight block to reduce the tilt of the elevator car when a preset condition is met, based on the tilt state of the elevator car obtained from the tilt detection unit.

2. The system for automatically adjusting the dynamic balance of an elevator according to claim 1, characterized in that, The preset conditions include elevator car tilting greater than a first threshold and elevator car tilting greater than a second threshold, wherein the second threshold is greater than the first threshold. The control unit is used to control the drive mechanism to move the sliding counterweight when the elevator car is in a level opening state and the tilt is greater than the first threshold. And when the elevator car is in operation and the tilt is greater than the second threshold, a command is sent to the elevator main control unit to control the elevator car to level with the nearest floor, and after leveling, the drive mechanism is controlled to move the sliding counterweight.

3. The system for automatically adjusting the dynamic balance of an elevator according to claim 2, characterized in that, The first threshold is a tilt angle of 1°, and the second threshold is a tilt angle of 3°.

4. The system for automatically adjusting the dynamic balance of an elevator according to claim 2, characterized in that, The control unit is further configured to send a leveling completion signal to the elevator main control unit after the elevator car has moved the sliding counterweight in the leveled and open state; upon receiving the leveling completion signal, the elevator main control unit allows the elevator car to close and start.

5. The system for automatically adjusting the dynamic balance of an elevator according to claim 1, characterized in that, The control unit is also used to disable control of the drive mechanism when it receives a signal from the elevator main control unit indicating that the elevator is in maintenance mode or in a fault shutdown state.

6. The system for automatically adjusting the dynamic balance of an elevator according to claim 1, characterized in that, The counterweight adjustment device includes four sets, which are located at the four corners of the car floor. Each set of the counterweight adjustment device includes a drive motor, a transmission screw fixed coaxially with the output end of the drive motor, a sliding counterweight block threaded onto the transmission screw, and a guide rail for guiding the movement of the sliding counterweight block. The drive motor and the transmission screw constitute the drive mechanism.

7. The system for automatically adjusting the dynamic balance of an elevator according to claim 1, characterized in that, The control unit includes: The communication interaction unit is used to receive the elevator operating status signal sent by the elevator main control unit, and to send car tilt data and leveling completion signal to the elevator main control unit. The data parsing unit is used to perform threshold determination on the tilt state obtained from the tilt detection unit; The motor drive control unit is used to control the drive mechanism according to the determination result of the data parsing unit.

8. The system for automatically adjusting the dynamic balance of an elevator according to claim 1, characterized in that, The tilt detection unit is an angle sensor, which is fixedly installed at the center of the car bottom.

9. The system for automatically adjusting the dynamic balance of an elevator according to claim 1, characterized in that, The control unit communicates with the elevator main control unit via a CAN bus.

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