A method for preventing sinking control of a large-load freight elevator and a large-load sinking-prevention freight elevator system

Abstract

The application discloses a large-load freight elevator sinking prevention control method and a large-load sinking prevention freight elevator system, and relates to the technical field of elevators. The method comprises the following steps: S1, collecting the running state of a car; S2, judging whether the car is in a stop floor state; if the judgment result is yes, executing step S3; if the judgment result is no, returning to step S1; S3, starting a falling prevention function; S4, opening the car door; S5, acquiring the relative height information between a leveling sensor assembly and a magnetic separation plate, and generating a sinking analysis result; S6, judging whether the sinking analysis result is car sinking; if the judgment result is yes, executing step S7; if the judgment result is no, executing step S8; S7, starting a car re-leveling process; S8, collecting the door machine state of the car; S9, judging whether the car satisfies any one of a door closing trigger mechanism; if the judgment result is yes, executing step S10; if the judgment result is no, returning to step S5; S10, closing the car door and releasing the falling prevention function. The application can avoid safety hazards and telescopic rod failures.

Description

Technical Field

[0001] This invention relates to the field of elevator technology, and in particular to a method for preventing sinking of a heavy-duty freight elevator and a system for preventing sinking of a heavy-duty freight elevator. Background Technology

[0002] When a freight elevator is at the level position and both the landing door and car door are open, if goods enter the car, their weight will suddenly be applied to the car. For freight elevators using wire rope traction drive, the mass balance between the car side and the counterweight side will be instantly disrupted. If the freight elevator does not maintain sufficient braking force or actively maintain leveling function when the doors are open, the car may experience slight sinking or even falling due to the weight change, resulting in leveling displacement. Although this displacement is small, it poses a significant safety hazard. The relative height between the car sill and the landing door sill can easily cause cargo carts to jam, cargo to tip over, or even cause people to trip or suffer shearing injuries. This is especially true in freight elevators that frequently load and unload heavy objects or elevators with large load capacities.

[0003] In addition, preventing the elevator car from falling due to excessive cargo weight is a crucial safety requirement. When the cargo is too heavy, the car may fall. In such cases, safety devices such as telescopic booms are typically used to secure the car and prevent further descent. However, after a fall, the telescopic boom shifts. If it is not leveled before the car resumes operation and is retracted directly, the excessive friction between the boom and the contacting components can easily lead to failure to return to its original position or damage to the boom.

[0004] Therefore, there is an urgent need to design a method for preventing sinking of heavy-duty freight elevators and a freight elevator for preventing car sinking in order to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for preventing sinking of a heavy-duty freight elevator and a freight elevator for preventing car sinking, which can solve the problem of car sinking when heavy goods enter the freight elevator in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention provides a method for preventing sinking of a heavy-duty freight elevator, comprising: S1, collecting the operating status of the car; S2, determining whether the car is in a stopped floor state; if yes, proceeding to step S3; if no, returning to step S1; S3, activating the anti-fall function; S4, opening the car door; S5, acquiring the relative height information between the leveling sensor assembly at the bottom of the car and the magnetic plate located below the door operator on the current floor, and generating a sinking analysis result; S6, determining whether the sinking analysis result indicates car sinking; if yes, proceeding to step S7; if no, proceeding to step S8; S7, initiating the car re-leveling process; S8, collecting the door operator status of the car; S9, determining whether the car meets any of the door closing trigger mechanisms; if yes, proceeding to step S10; if no, returning to step S5; S10, closing the car door and deactivating the anti-fall function.

[0007] As an improvement to the above solution, the step of obtaining the relative height information between the leveling sensor assembly and the magnetic shielding plate and generating the sinking analysis result includes: obtaining the total magnetic flux of the leveling sensor assembly; comparing the total magnetic flux of the leveling sensor assembly with a preset magnetic flux threshold; if the total magnetic flux of the leveling sensor assembly is less than the preset magnetic flux threshold, the leveling sensor assembly outputs a first level signal to indicate that the car position is normal; if the total magnetic flux of the leveling sensor assembly is not less than the preset magnetic flux threshold, the leveling sensor assembly outputs a second level signal to indicate that the car sinks.

[0008] As an improvement to the above solution, the level signal output by the leveling sensor component is acquired in real time; it is determined whether the level signal is the first level signal. If it is, the car is driven to stop moving and the result of the car leveling is output; otherwise, the car is driven to move upward.

[0009] As an improvement to the above solution, the anti-fall function includes: driving the motor to rotate to extend the telescopic rod at the bottom of the car.

[0010] As an improvement to the above solution, the door closing trigger mechanism includes: pressing the door closing button; and the door opening timeout.

[0011] Accordingly, the present invention also provides a main controller, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the anti-sinking control method for the heavy-duty freight elevator.

[0012] Accordingly, the present invention also provides a heavy-duty anti-sinking freight elevator system, comprising a car for carrying goods; an anti-fall unit for preventing the car from falling; a detection unit for detecting the relative height between the leveling sensor assembly and the magnetic shielding plate; a main controller; and a shaft for the space for car movement. The car, the anti-fall unit, and the detection unit are all located in the shaft, and the main controller is electrically connected to the car, the anti-fall unit, and the detection unit.

[0013] As an improvement to the above solution, the detection unit includes: a leveling sensor assembly, installed on the elevator car, used to detect the presence of a magnetic field to obtain height information and output a level signal; and a magnetic shielding plate, installed in the elevator shaft at positions corresponding to each floor, used to block the magnetic field to form a non-magnetic area, thereby changing the magnitude of the magnetic flux of the leveling sensor assembly.

[0014] As an improvement to the above solution, the leveling sensor assembly includes an upper leveling sensor and a lower leveling sensor, and the length of the magnetic shielding plate is not less than the distance between the upper leveling sensor and the lower leveling sensor.

[0015] As an improvement to the above solution, the fall protection unit includes a telescopic rod and a fall protection tube for abutting the telescopic rod; the telescopic rod is located at the bottom of the car, and the main controller is electrically connected to the telescopic rod; the fall protection tube extends from the bottom of the hoistway to the top of the hoistway, and the outer wall of the fall protection tube is provided with several protrusions for abutting the telescopic rod.

[0016] The beneficial effects of implementing this invention are as follows: By collecting data on the car's operating status and determining the floor it's stopping at, the telescopic boom extends before the car doors open to prevent the car from falling. After the car doors open, it continuously acquires the relative height information between the leveling sensor assembly and the magnetic shielding plate to promptly detect slight subsidence caused by cargo loading, avoiding safety hazards due to cumulative displacement. When subsidence is detected, the car re-leveling function is immediately activated, automatically adjusting the car's position to restore the car sill to level with the landing sill. This prevents cargo carts from getting stuck or tipping over, avoiding accidents such as tripping, leg injuries, or being sheared. The re-leveling also prevents the telescopic boom from failing to retract or becoming damaged after the car doors close. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating an embodiment of the anti-sinking control method for a heavy-duty freight elevator of the present invention. Figure 2 This is a flowchart illustrating an embodiment of the anti-sinking control method for a heavy-duty freight elevator of the present invention, which obtains the relative height information between the leveling sensor assembly and the magnetic shielding plate and generates sinking analysis results. Figure 3This is a flowchart illustrating an embodiment of the anti-sinking control method for a heavy-duty freight elevator of the present invention, specifically the process of re-leveling the car. Figure 4 This is a schematic diagram of the structure of the heavy-duty anti-sinking freight elevator system 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. It is hereby declared that the directional terms such as up, down, left, right, front, back, inside, and outside used in this text are based solely on the accompanying drawings and are not intended to specifically limit the invention.

[0019] See Figure 1 The anti-sinking control method for a heavy-duty freight elevator of the present invention includes: S1. Collect the operating status of the car; It should be noted that in this embodiment, the car's operating state may be in motion, stopped, or stopped at a floor. If the collected state is in motion or stopped, this step will be repeated continuously.

[0020] S2. Determine whether the car is in a stopped floor state. If yes, proceed to step S3. If no, return to step S1. S3. Activate the fall protection function; S4. Open the car door; It should be noted that the anti-fall function is a protective mechanism designed to prevent uncontrolled falls that could injure users or damage goods if the car is placed inside before the leveling function is fully activated. This mechanism uses a telescopic rod; before opening the car door, the motor must rotate to fully extend the rod, ensuring the car's safety during use.

[0021] S5. Obtain the relative height information between the leveling sensor assembly at the bottom of the car and the magnetic shielding plate located below the door operator on the current floor, and generate the sinking analysis results; S6. Determine whether the sinking analysis result is car sinking. If the determination is yes, proceed to step S7; if the determination is no, proceed to step S8. S7. Initiate the car re-leveling process; S8. Collect the door operator status of the car; S9. Determine whether the car meets any of the door closing trigger mechanisms. If yes, proceed to step S10; if no, return to step S5. S10. Close the car door and deactivate the fall protection function.

[0022] This embodiment collects data on the car's operating status and determines the floor it stops at. After the doors open, it continuously acquires the relative height information between the leveling sensor assembly and the magnetic shielding plate. This allows for timely detection of slight car subsidence caused by cargo loading, preventing safety hazards due to cumulative displacement. When car subsidence is detected, the car re-leveling function is immediately activated, automatically adjusting the car's position to restore the car sill to level with the landing sill. This prevents cargo carts from getting stuck or tipping over, and avoids accidents such as tripping, leg injuries, or being cut. Furthermore, a door-closing trigger mechanism is incorporated after car leveling to close the car doors, preventing the telescopic boom from failing to retract or becoming damaged.

[0023] See Figure 2 The step of obtaining the relative height information between the leveling sensor assembly and the magnetic shielding plate, and generating the subsidence analysis results, includes: S501. Obtain the total magnetic flux of the leveling sensor assembly; S502. Compare the total magnetic flux of the leveling sensor assembly with a preset magnetic flux threshold. If the total magnetic flux of the leveling sensor assembly is less than a preset magnetic flux threshold, the leveling sensor assembly outputs a first level signal to indicate that the car position is normal. If the total magnetic flux of the leveling sensor assembly is not less than a preset magnetic flux threshold, the leveling sensor assembly outputs a second level signal to characterize the car sinking.

[0024] It should be noted that when the elevator car is stopped, since the magnetic shielding plate and the leveling sensor assembly are at the same height, and the magnetic field is generated horizontally from one side to the other by a detection element with a small amount of magnetism, when the elevator car is flush with the landing door sill, the leveling sensor assembly will be completely within the non-magnetic area generated by the magnetic shielding plate. In this embodiment, the comparison is made on whether the magnetic flux of the leveling sensor assembly is not less than a magnetic flux threshold. If the magnetic flux of the leveling sensor assembly is not less than a preset threshold, it means that some or all of the leveling sensor assembly is not within the non-magnetic area generated by the magnetic shielding plate.

[0025] In addition, the first level signal generated by the level sensor assembly can be high and the second level signal can be low, or the first level signal can be low and the second level signal can be high.

[0026] See Figure 3 The car re-leveling process includes: The system acquires the level signal output by the leveling sensor component in real time; it determines whether the level signal is the first level signal. If it is, the system drives the car to stop moving and outputs the result of the car completing the leveling process. Otherwise, the system drives the car to move upward.

[0027] It should be noted that during the re-leveling process, as long as the leveling sensor assembly fails to enter the non-magnetic area created by the magnetic shield due to the relative height between it and the magnetic shield, the relative height information between the leveling sensor assembly and the magnetic shield must be continuously monitored. The leveling sensor assembly will continuously output a second-level signal until all parts of the leveling sensor assembly have completely entered the non-magnetic area created by the magnetic shield. Only then can the car re-leveling be considered complete.

[0028] Preferably, the anti-fall function includes: driving a motor to rotate to extend the telescopic rod at the bottom of the car.

[0029] In this embodiment, four telescopic rods of identical specifications are installed at the bottom of the car. When the car is level, the extended rods do not touch any other components. Only when the car falls will the rods abut against the protruding block below, thus limiting the car's displacement. The motor rotates forward when the rods are extended and reverses when the rods are retracted.

[0030] Preferably, the door closing trigger mechanism includes: pressing the door closing button; and the door opening timeout.

[0031] Accordingly, the present invention also provides a main controller, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the steps of the anti-sinking control method for a heavy-duty freight elevator.

[0032] See Figure 4 The present invention also provides a heavy-duty anti-sinking freight elevator system, comprising: Car 1, used to carry goods; Fall protection unit 2 is used to prevent the car 1 from falling; The detection unit 3 is used to detect the relative height between the leveling sensor assembly 31 and the magnetic shielding plate 32; Main controller 4; The hoistway is the space used for the movement of the car 1; The car 1, the fall protection unit 2, and the detection unit 3 are all located inside the hoistway, and the main controller 4 is electrically connected to the car 1, the fall protection unit 2, and the detection unit 3.

[0033] By installing the anti-fall unit 2, the car 1 can be stabilized in time in the event of a fall, preventing an uncontrolled descent. By installing the detection unit 3 and the main controller 4, the anti-sinking function can be activated in time when the car 1 sinks, restoring the car 1 sill to be flush with the landing door sill.

[0034] Specifically, the detection unit 3 includes: A leveling sensor assembly 31 is installed on the elevator car 1 to detect the presence of a magnetic field to determine height information. A magnetic shielding plate 32 is installed in the elevator shaft at positions corresponding to each floor to block the magnetic field, creating a non-magnetic area and thus changing the magnetic flux of the leveling sensor assembly 31. By setting up the leveling sensor assembly 31 and the magnetic shielding plate 32, the main controller 4 can accurately determine the actual height position of the elevator car 1, thereby controlling whether to activate the re-leveling function.

[0035] Specifically, the leveling sensor assembly 31 includes an upper leveling sensor 311 and a lower leveling sensor 312, and the length of the magnetic shielding plate 32 is not less than the distance between the upper leveling sensor 311 and the lower leveling sensor 312, so that the leveling sensor assembly 31 can be completely within the coverage area of ​​the magnetic shielding plate 32.

[0036] Preferably, the fall protection unit 2 includes a telescopic rod 21 and a fall protection tube 22 for abutting the telescopic rod 21. The telescopic rod 21 is located at the bottom of the car 1, and the main controller 4 is electrically connected to the telescopic rod 21. The main controller 4 controls the telescopic rod 21 to extend when the car 1 stops at a floor and retract when the car 1 is in operation. The main controller 4 automatically controls the extension and retraction of the telescopic rod 21 according to the operating status of the car 1, without human intervention, thus improving the system's intelligence level and response speed. The fall protection tube 22 extends from the bottom of the hoistway to the top of the hoistway, and the outer wall of the fall protection tube 22 is provided with several protrusions 221 for abutting the telescopic rod 21. The protrusions 221 are located below the door operator on each floor, so that when the car 1 stops at any floor, the telescopic rod 21 can find a corresponding protrusion 221 to abut, achieving fall protection at any position.

[0037] As can be seen from the above, this invention collects the operating status of the car 1 and determines the status of the floor it stops at. Before the car 1 opens, the telescopic rod 21 extends, so that even if an overload occurs at the moment the goods are placed in the car 1, the car 1 will only sink to a very limited extent and be abutted by the telescopic rod 21 and the protrusion 221 on the anti-fall pipe 22, thus avoiding the risk of the car 1 falling without limit or being sheared. After the door opens, the relative height information between the leveling sensor assembly 31 and the magnetic shielding plate 32 below the door operator of the current floor is continuously acquired, and the total magnetic flux of the leveling sensor assembly 31 is compared with a preset magnetic flux threshold. When the total magnetic flux is not less than the threshold, a second level signal is output to determine that the car 1 has sunk, and then the re-leveling flow is initiated. The process drives the car 1 to move upward until the leveling sensor assembly 31 completely enters the non-magnetic area formed by the magnetic shielding plate 32 and outputs the first level signal, thus stopping the car 1 sill and the landing door sill to return to level. The telescopic rod 21 is only retracted when the door closing trigger mechanism is met, avoiding the inability to retract the telescopic rod 21 or damage to it. Through the timing coordination of fall prevention and re-leveling, accurate sinking detection based on magnetic flux change, and protection logic for retracting the telescopic rod 21 after the door is closed, the practical problems of car 1 sinking, cart jamming, personnel tripping, and telescopic rod 21 failure to reset caused by the instantaneous loading of goods in heavy-duty freight elevators are effectively solved, significantly improving the safety and reliability of freight elevator operation.

[0038] In actual use, after the user calls the elevator at their floor, the elevator car 1 will move to the user's floor. After the elevator arrives at the user's floor, it will first extend the telescopic rod 21 and then open the car door. Then, it will obtain the relative height information between the leveling sensor component 31 and the magnetic plate 32 and generate a sinking analysis result. At this time, the user pushes the goods into the car 1. The car 1 may sink due to the weight of the goods. At this time, the motor needs to pull the steel cable to make the car 1 rise slightly to return to the position level with the floor sill.

[0039] Because the re-leveling function is activated with relatively low force initially, a protruding block 221 is used to hold the telescopic rod 21 against the car 1 to prevent injury to personnel or goods from a sudden drop in the car 1. This effectively avoids accidents. After the user has finished loading the goods and pressed the door close button, the car 1 enters the running state.

[0040] It should be noted that by setting a door-closing trigger mechanism, the car door can close automatically, bringing car 1 to a stop state. Since users will leave after use, it is unsafe and unsightly to keep the car door open for an extended period of time; therefore, the car door needs to be closed.

[0041] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for preventing sinking of a heavy-duty freight elevator, characterized in that, include: S1. Collect the operating status of the car; S2. Determine whether the car is in a stopped floor state. If yes, proceed to step S3. If no, return to step S1. S3. Activate the fall protection function; S4. Open the car door; S5. Obtain the relative height information between the leveling sensor assembly at the bottom of the car and the magnetic shielding plate located below the door operator on the current floor, and generate the sinking analysis results; S6. Determine whether the sinking analysis result is car sinking. If the determination is yes, proceed to step S7; if the determination is no, proceed to step S8. S7. Initiate the car re-leveling process; S8. Collect the door operator status of the car; S9. Determine whether the car meets any of the door closing trigger mechanisms. If yes, proceed to step S10; if no, return to step S5. S10. Close the car door and deactivate the fall protection function.

2. The anti-sinking control method for a heavy-duty freight elevator according to claim 1, characterized in that, The steps of obtaining the relative height information between the leveling sensor assembly and the magnetic shielding plate, and generating the subsidence analysis results, include: Obtain the total magnetic flux of the leveling sensor assembly; The total magnetic flux of the leveling sensor assembly is compared with a preset magnetic flux threshold. If the total magnetic flux of the leveling sensor assembly is less than a preset magnetic flux threshold, the leveling sensor assembly outputs a first level signal to indicate that the car position is normal. If the total magnetic flux of the leveling sensor assembly is not less than a preset magnetic flux threshold, the leveling sensor assembly outputs a second level signal to characterize the car sinking.

3. The anti-sinking control method for a heavy-duty freight elevator according to claim 2, characterized in that, The car re-leveling process includes: Real-time acquisition of the level signal output by the leveling sensor component; Determine whether the level signal is the first level signal. If it is, drive the car to stop moving and output the result of the car leveling up. Otherwise, drive the car to move upward.

4. The anti-sinking control method for a heavy-duty freight elevator according to claim 1, characterized in that, The fall prevention function includes: driving a motor to rotate and extend the telescopic rod at the bottom of the car.

5. The anti-sinking control method for a heavy-duty freight elevator according to claim 1, characterized in that, The door closing trigger mechanism includes: Press the close button; The door opening time has expired.

6. A master controller, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the anti-sinking control method for the heavy-duty freight elevator as described in any one of claims 1 to 5.

7. A heavy-duty anti-sinking freight elevator system, characterized in that, include: The car, used to carry goods; Fall arrestor unit, used to prevent the car from falling; The detection unit is used to detect the relative height between the leveling sensor assembly and the magnetic shielding plate; The main controller as described in claim 6; The shaft is the space used for the movement of the car; The car, fall protection unit, and detection unit are all located inside the hoistway, and the main controller is electrically connected to the car, fall protection unit, and detection unit.

8. The heavy-duty anti-sinking freight elevator system according to claim 7, characterized in that, The detection unit includes: A leveling sensor assembly, installed on the car, is used to detect the presence of a magnetic field to determine height information and output a level signal; Magnetic shielding plates are installed in the elevator shaft at positions corresponding to each floor to impede magnetic fields and create non-magnetic areas, thereby changing the magnetic flux of the leveling sensor assembly.

9. The heavy-duty anti-sinking freight elevator system according to claim 8, characterized in that, The leveling sensor assembly includes an upper leveling sensor and a lower leveling sensor, and the length of the magnetic shielding plate is not less than the distance between the upper leveling sensor and the lower leveling sensor.

10. The heavy-duty anti-sinking freight elevator system according to claim 7, characterized in that, The fall protection unit includes a telescopic rod and a fall protection tube for abutting the telescopic rod; The telescopic rod is located at the bottom of the car, and the main controller is electrically connected to the telescopic rod. The fall arrestor extends from the bottom of the shaft to the top of the shaft, and the outer wall of the fall arrestor is provided with several protrusions for abutting against the telescopic rod.

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