Anti-falling lifting device and lifting method thereof

Abstract

The invention relates to an anti-falling lifting device and a lifting method thereof. The anti-falling lifting device comprises a fixed bracket, the driving assembly is fixedly mounted in the middle of the fixed bracket; the first winding drum and the second winding drum are rotationally mounted on the fixed bracket; the first bearing piece is wound on the first winding drum; the second bearing piece is wound on the second winding drum; the linkage frame is rotationally mounted on the fixed bracket through a pin shaft; the lifting frame is used for bearing a heavy object; and the detection unit is used for detecting unbalance rotation of the linkage frame. The lifting device has the advantages that by arranging the structure of the double winding drums and the double bearing pieces (such as steel wire ropes), the linkage frame capable of detecting unbalance is introduced, and double insurance is provided for the lifting device. And when any bearing part is broken, the device can instantly identify a fault and start protection, so that the risk of falling of a heavy object is fundamentally avoided, and the safety of equipment is greatly improved.

Description

Technical Field

[0001] The present invention relates to a fall - prevention lifting device and its lifting method, belonging to the field of safety of heavy - object lifting equipment. Background Art

[0002] In the fields of industrial production, construction, logistics transportation, etc., devices such as winches and hoists that lift heavy objects by steel ropes are widely used. Currently, most small and medium - sized lifting devices use a single steel rope for load - bearing and transmission. This structure has significant safety hazards: when the only steel rope breaks due to overloading, fatigue, wear or accidental impact, the heavy object will lose restraint and fall rapidly. This will not only cause damage to the equipment or the heavy object itself, but may also lead to serious personal safety accidents and significant production losses.

[0003] To improve safety, lifting solutions using double steel ropes have emerged in the prior art, improving reliability through redundant design. However, in many existing double - rope lifting devices, the two steel ropes often work independently, lacking an effective real - time monitoring and linkage protection mechanism. When one of the steel ropes breaks, the device often cannot immediately detect it and take braking measures. The load of the entire device will instantaneously transfer to the other steel rope, which may cause a chain reaction, resulting in the second steel rope also breaking due to sudden load, and ultimately still unable to avoid the occurrence of a falling accident.

[0004] Therefore, there is an urgent need in this field for a lifting device that not only has a double - rope redundant structure but can also immediately detect an abnormality when one of the steel ropes breaks and automatically start a safety protection program (such as stopping operation, sounding an alarm), essentially eliminating the falling risk caused by rope breakage. Summary of the Invention

[0005] To overcome the defects of the prior art, the present invention provides a fall - prevention lifting device and its lifting method. The technical solution of the present invention is as follows: A fall - prevention lifting device includes a fixed support (5); a driving component fixedly installed in the middle of the fixed support (5); a first drum (3) and a second drum (18) rotatably installed on the fixed support (5), symmetrically arranged along the driving component, and both driven by the driving component to rotate synchronously; a first carrier wound around the first drum (3); a second carrier wound around the second drum (18); A linkage frame rotatably installed on the fixed support (5) through a pin shaft (15); A lifting frame (10) for carrying a heavy object, which is lifted and lowered under the drive of the driving component; After the free end of the first bearing member passes around the first guide member on the lifting frame (10), it is connected to the linkage frame to form a first connection point (7). After the free end of the second bearing member passes around the second guide member on the lifting frame, it connects with the linkage frame to form a second connection point (14). A detection unit is used to detect unbalanced rotation of the linkage frame; The linkage frame maintains balance under the combined action of the first and second bearing members; when either the first or second bearing member breaks, the linkage frame loses balance under the tension of the other unbroken bearing member and rotates around the pin, thereby being detected by the detection unit. The control unit, the drive component, and the detection unit are all connected to the control unit.

[0006] The linkage frame is a rotating bracket (13), and the pin is installed in the middle of the rotating bracket (13); the first connection point and the second connection point are symmetrically arranged on the rotating bracket (13).

[0007] The first bearing member (8) and the second bearing member (12) are both steel wire ropes; the first guide member (9) and the second guide member (11) are both pulleys.

[0008] The drive assembly includes a motor reducer (1), one end of the first drum (3) is connected to one of the output shafts of the motor reducer (1) via a left coupling (2), and the other end is rotatably mounted on the fixed bracket (5) via a left belt bearing (4). One end of the first drum (3) is connected to one of the output shafts of the motor reducer (1) via a left coupling (2), and the other end is rotatably mounted on the fixed bracket (5) via a left belt bearing (4). One end of the second drum (3) is connected to the other output shaft of the motor reducer (1) via a right coupling (19), and the other end is rotatably mounted on the fixed bracket (5) via a right bearing (17).

[0009] The detection unit includes a first detection device (6) and a second detection device (16) respectively disposed on both sides of the linkage frame.

[0010] The first detection device (6) and the second detection device (16) are proximity switches, limit switches or angle sensors, and the first detection device (6) and the second detection device (16) are symmetrically arranged on the fixed bracket (5).

[0011] Upon receiving the trigger signal from the detection unit, the control unit controls the drive component to stop operating and issues an alarm signal.

[0012] A lifting method based on a fall-prevention lifting device includes the following steps: S1: The first drum (3) and the second drum (18) are driven to rotate synchronously by the drive assembly, so that the first carrier (8) and the second carrier (12) wound on them are wound up and down synchronously, thereby driving the lifting frame (10) to perform lifting operations; S2: During the lifting operation, the balance status of the linkage frame is monitored in real time by the detection unit; S3: When the detection unit detects that the linkage frame is rotating unbalanced due to the breakage of any load-bearing component, it immediately sends a trigger signal to the control unit; S4: After receiving the trigger signal, the control unit performs a safety protection operation, which includes controlling the drive component to stop running and issuing an alarm signal.

[0013] In step S4, the control unit determines and indicates whether the broken bearing is the first bearing (8) or the second bearing (12) based on the specific triggered detection device signal.

[0014] The advantages of this invention are: (1) By setting up a structure with double drums and double load-bearing components (such as steel wire ropes), a linkage frame that can detect imbalance is introduced, providing double insurance for the lifting device. When any load-bearing component breaks, the device can instantly identify the fault and activate the protection, fundamentally eliminating the risk of heavy objects falling and greatly improving the safety of the equipment.

[0015] (2) The linkage frame is in balance under normal conditions. Once the force on one side disappears (i.e. the load-bearing component breaks), a significant rotational movement will occur immediately. The mechanical linkage response is very fast and direct. The detection unit can capture this imbalance signal without delay, ensuring the sensitivity and accuracy of the detection.

[0016] (3) By electrically connecting the detection unit to the control unit, automation from fault detection to safety protection is achieved. After detecting a breakage signal, the system can immediately and automatically stop the operation of the drive components and issue an alarm without manual intervention, effectively preventing the accident from escalating and realizing intelligent safety protection.

[0017] (4) The structure is simple and the machinery is reliable. It can achieve efficient monitoring without the need for a complex and expensive sensor system. The whole device is an improvement on the existing lifting structure. The modification cost is low, it is easy to produce and promote, and it has high practical value and market prospects. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention.

[0019] Figure 2 yes Figure 1 Side view. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as a result. However, these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that modifications or substitutions can be made to the details and form of the technical solutions of the present invention without departing from the spirit and scope of the present invention, but all such modifications and substitutions fall within the protection scope of the present invention.

[0021] See Figure 1 and Figure 2 This invention relates to a fall-prevention lifting device, comprising a fixed bracket 5; a drive assembly fixedly installed in the middle of the fixed bracket 5; a first drum 3 and a second drum 18 rotatably mounted on the fixed bracket 5, symmetrically arranged along the drive assembly, both driven to rotate synchronously by the drive assembly; a first load-bearing member wound on the first drum 3; a second load-bearing member wound on the second drum 18; a linkage frame rotatably mounted on the fixed bracket 5 via a pin 15; a lifting frame 10 for carrying heavy objects and lifting them under the drive of the drive assembly; the free end of the first load-bearing member bypasses a first guide on the lifting frame 10 and connects to the linkage frame to form a first connection point 7; the free end of the second load-bearing member bypasses a second guide on the lifting frame and connects to the linkage frame to form a second connection point 14; and a detection unit for detecting unbalanced rotation of the linkage frame. The linkage frame maintains balance under the combined action of the first and second bearing members; when either the first or second bearing member breaks, the linkage frame loses balance under the tension of the other unbroken bearing member and rotates around the pin, thereby being detected by the detection unit; the control unit, the drive assembly, and the detection unit are all connected to the control unit.

[0022] The linkage frame is in a balanced state during normal operation, and its response to the breakage of a single-sided wire rope is immediate and significant. Even if only partial damage to the wire rope causes a slight change in tension, it will disrupt the balance and cause the linkage frame to deflect. This principle based on mechanical balance makes the detection highly sensitive, and the mechanical structure itself has strong anti-interference capabilities, making it more direct and reliable than simply monitoring electrical signals such as current or vibration.

[0023] This safety protection mechanism (linkage frame, pin shaft, and detection unit) is integrated as a relatively independent module on the fixed support, eliminating the need for large-scale modifications to the existing drive components, drum, and lifting frame main structure. This device can be easily added to traditional double-drum lifting equipment, reducing the cost and difficulty of safety upgrades.

[0024] The linkage frame is a rotating bracket 13, and the pin is installed in the middle of the rotating bracket 13; the first connection point 7 and the second connection point 14 are symmetrically arranged on the rotating bracket 13. This ensures that the rotating bracket is in a stable balanced state during normal operation. This preset balance is extremely sensitive to faults such as unilateral wire rope breakage, amplifying minor force imbalances into significant rotational movements, thereby greatly improving the sensitivity and reliability of detection and ensuring the timely and accurate triggering of the safety system.

[0025] Both the first load-bearing component 8 and the second load-bearing component 12 are steel wire ropes; both the first guide component 9 and the second guide component 11 are pulleys. This fully utilizes the mature combination of the high strength of steel wire ropes and the low friction of pulleys, ensuring both load-bearing capacity and efficient and stable tension transmission. This allows the rotating support 13 to sensitively and accurately detect minute changes in the tension of the steel wire ropes, providing a reliable foundation.

[0026] The drive assembly includes a motor reducer 1. One end of the first drum 3 is connected to one of the output shafts of the motor reducer 1 via a left coupling 2, and the other end is rotatably mounted on the fixed bracket 5 via a left bearing 4. Using a coupling for connection results in a short transmission path, low power loss, and high efficiency. Furthermore, concentrating the drive assembly in the middle of the fixed bracket makes the entire power system compact, rationally laid out, and space-saving.

[0027] One end of the first drum 3 is connected to one of the output shafts of the motor reducer 1 via a left coupling 2, and the other end is rotatably mounted on the fixed bracket 5 via a left bearing 4. One end of the second drum 3 is connected to the other output shaft of the motor reducer 1 via a right coupling 19, and the other end is rotatably mounted on the fixed bracket 5 via a right bearing 17. Both drums are driven synchronously by a single drive assembly, and a symmetrical support design ensures the synchronicity of the double-rope movement from the power source. This also forms a stable transmission frame with high rigidity and centering, providing a reliable tension condition for the balance of the rear-end rotating support.

[0028] The detection unit includes a first detection device 6 and a second detection device 16 respectively disposed on both sides of the linkage frame. The first detection device 6 and the second detection device 16 are proximity switches, limit switches, or angle sensors, and are symmetrically arranged on the fixed bracket 5. This symmetrical dual-detection-point layout not only reliably detects imbalance events but also accurately determines which side has broken, achieving an upgrade from fault alarm to fault location, providing crucial information for subsequent safety response and rapid repair.

[0029] Upon receiving the trigger signal from the detection unit, the control unit controls the drive component to stop operating and issues an alarm signal.

[0030] The present invention also relates to a lifting method based on a fall-prevention lifting device, comprising the following steps: S1: The first drum 3 and the second drum 18 are synchronously driven to rotate by the drive component, so that the first carrier 8 and the second carrier 12 wound on them are synchronously unwound and retracted, thereby driving the lifting frame 10 to perform lifting operations. S2: During the lifting operation, the balance status of the linkage frame is monitored in real time by the detection unit; S3: When the detection unit detects that the linkage frame is rotating unbalanced due to the breakage of any load-bearing component, it immediately sends a trigger signal to the control unit; S4: After receiving the trigger signal, the control unit performs a safety protection operation, which includes controlling the drive component to stop running and issuing an alarm signal.

[0031] In step S4, the control unit determines and indicates whether the broken bearing component is the first bearing component 8 or the second bearing component 12 based on the specific triggered detection device signal.

[0032] The fall-prevention lifting device of the present invention can be divided into two states during its complete operation: normal operation and fault protection. The specific working principle is as follows: I. Normal Operating Procedure 1. Start-up and Lifting: When it is necessary to lift or lower a heavy object, the control unit issues a command to start the motor reducer 1. The dual output shafts of the motor reducer 1 drive the first drum 3 and the second drum 18 to rotate synchronously through the left coupling 2 and the right coupling 19.

[0033] 2. Synchronous cable winding and unwinding: During lifting, the two drums synchronously wind the first bearing member 8 and the second bearing member 12; during descent, the two drums synchronously release the wire rope. Because the power source is the same and the transmission structure is symmetrical, absolute synchronous movement of the two ropes is guaranteed.

[0034] 3. Force Transmission and Balance: The tension of the wire ropes is transmitted to the lifting frame 10 through two pulleys, driving the lifting frame 10 to rise and fall. Simultaneously, the free ends of the two wire ropes are fixed to the first connection point 7 and the second connection point 14 symmetrically arranged on both sides of the rotating support 13, respectively. Under normal conditions, the tension of the two wire ropes is equal, and the torques applied to the rotating support 13 cancel each other out, allowing the rotating support 13 to maintain a horizontal balance under the support of the pin 15, and preventing it from contacting the first detection device 6 or the second detection device 16 on either side.

[0035] II. Fault Protection Procedure 1. Fracture Occurrence: Suppose that during the lifting process, the first load-bearing component 8 fractures due to an accident.

[0036] 2. Disruption of balance: At this moment, the tension acting on the left connection point 7 of the rotating bracket 13 disappears instantly, while the tension on the second bearing member 12 at the right connection point 14 remains. This disrupts the force balance on both sides of the rotating bracket 13.

[0037] 3. Bracket Trigger: Under the torque of the pulling force on the right side, the rotating bracket 13 quickly rotates clockwise around the pin 15 (as shown in the figure).

[0038] 4. Signal Detection: When the right side of the rotating bracket 13 approaches or contacts the second detection device 16 during rotation (e.g., triggering a limit switch or entering the sensing range of a proximity switch), the second detection device 16 immediately converts the mechanical displacement signal into an electrical signal and sends it to the control unit.

[0039] 5. Automatic protection: After receiving the trigger signal from the second detection device 16, the control unit immediately executes the preset safety procedure: First, it cuts off the power to the motor reducer 1 to stop the drum from rotating; Second, it issues an audible and visual alarm signal to remind the operator that "the left wire rope has broken".

[0040] 6. Results: The entire process from fault detection to safety response was completed. The heavy object was reliably suspended by the unbroken second load-bearing member 12 and effectively braked, thus completely avoiding a major safety accident caused by uncontrolled falling. If the breakage occurred on the right side, the first detection device 6 would be triggered, and the corresponding protective action would be executed based on the same principle.

[0041] This invention transforms the traditional passive load-bearing lifting into proactive and predictive safety protection, thereby improving the safety performance of the equipment.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A fall-prevention lifting device, characterized in that, include: Fixed bracket (5); The drive assembly is fixedly installed in the middle of the fixed bracket (5); The first spool (3) and the second spool (18) are rotatably mounted on the fixed bracket (5) and symmetrically arranged along the drive assembly. They are both driven to rotate synchronously by the drive assembly. The first carrier is wound on the first spool (3); The second carrier is wound around the second spool (18); The linkage frame is rotatably mounted on the fixed bracket (5) via a pin (15); The lifting frame (10) is used to carry heavy objects and is lifted and lowered under the drive of the drive assembly; After the free end of the first bearing member passes around the first guide member on the lifting frame (10), it is connected to the linkage frame to form a first connection point (7). After the free end of the second bearing member passes around the second guide member on the lifting frame, it connects with the linkage frame to form a second connection point (14). A detection unit is used to detect unbalanced rotation of the linkage frame; The linkage frame maintains balance under the combined action of the first and second bearing members; when either the first or second bearing member breaks, the linkage frame loses balance under the tension of the other unbroken bearing member and rotates around the pin, thereby being detected by the detection unit. The control unit, the drive component, and the detection unit are all connected to the control unit.

2. The fall-prevention lifting device according to claim 1, characterized in that, The linkage frame is a rotating bracket (13), and the pin is installed in the middle of the rotating bracket (13); the first connection point and the second connection point are symmetrically arranged on the rotating bracket (13).

3. The fall-prevention lifting device according to claim 1 or 2, characterized in that, The first bearing member (8) and the second bearing member (12) are both steel wire ropes; the first guide member (9) and the second guide member (11) are both pulleys.

4. The fall-prevention lifting device according to claim 2 or 3, characterized in that, The drive assembly includes a motor reducer (1), one end of the first drum (3) is connected to one of the output shafts of the motor reducer (1) via a left coupling (2), and the other end is rotatably mounted on the fixed bracket (5) via a left belt bearing (4). One end of the first drum (3) is connected to one of the output shafts of the motor reducer (1) via a left coupling (2), and the other end is rotatably mounted on the fixed bracket (5) via a left belt bearing (4). One end of the second drum (3) is connected to the other output shaft of the motor reducer (1) via a right coupling (19), and the other end is rotatably mounted on the fixed bracket (5) via a right bearing (17).

5. The fall-prevention lifting device according to claim 4, characterized in that, The detection unit includes a first detection device (6) and a second detection device (16) respectively disposed on both sides of the linkage frame.

6. The fall-prevention lifting device according to claim 5, characterized in that, The first detection device (6) and the second detection device (16) are proximity switches, limit switches or angle sensors, and the first detection device (6) and the second detection device (16) are symmetrically arranged on the fixed bracket (5).

7. The fall-prevention lifting device according to claim 1, characterized in that, Upon receiving the trigger signal from the detection unit, the control unit controls the drive component to stop operating and issues an alarm signal.

8. A lifting method based on the anti-fall lifting device according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1: The first drum (3) and the second drum (18) are driven to rotate synchronously by the drive assembly, so that the first carrier (8) and the second carrier (12) wound on them are wound up and down synchronously, thereby driving the lifting frame (10) to perform lifting operations; S2: During the lifting operation, the balance status of the linkage frame is monitored in real time by the detection unit; S3: When the detection unit detects that the linkage frame is rotating unbalanced due to the breakage of any load-bearing component, it immediately sends a trigger signal to the control unit; S4: After receiving the trigger signal, the control unit performs a safety protection operation, which includes controlling the drive component to stop running and issuing an alarm signal.

9. The lifting method according to claim 8, characterized in that, In step S4, the control unit determines and indicates whether the broken bearing is the first bearing (8) or the second bearing (12) based on the specific triggered detection device signal.

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