Crane and manual emergency release method thereof

Abstract

The invention provides a crane and a manual emergency release method thereof, and relates to the technical field of cranes. One end of the steel wire rope is connected with the winding mechanism, the winding mechanism is used for winding and unwinding the steel wire rope, and the winding mechanism is provided with a normally-closed brake; the other end of the steel wire rope sequentially penetrates through the two fixing structures, the fixing structures are used for fixing the steel wire rope, and the two fixing structures are arranged in a spaced mode; the middle of the steel wire rope is wound around the movable pulley, and a lifting appliance is arranged on the movable pulley and used for being connected with a load; the problems that in the prior art, a crane cannot achieve load manual emergency release through a simple structure and mode, and the use requirement for a ship is difficult to meet are solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cranes, and more particularly relates to a crane and a manual emergency release method thereof. BACKGROUND

[0002] As important material handling equipment, cranes are widely used in the fields of ships, construction, industry, etc. For cranes on ships, according to the requirements of the Code on Cranes for Ships and Offshore Units, the hoisting mechanism brake of the crane should be normally closed, and should be provided with an emergency release device to ensure that any load can be safely lowered and positioned, and the safety factor of the brake is not less than 1.5.

[0003] When the existing crane is working normally, the drum is driven to rotate by a driving motor, so as to realize the winding and unwinding of the steel wire rope and the lifting of the load. When a power failure occurs suddenly, the motor brake will immediately lock the drum, so that the steel wire rope cannot move, the load is suspended in the air and cannot be lowered to the position, which exists a safety hazard and cannot meet the requirements of emergency release in the specification. At present, some emergency release devices have complex structures, need to be additionally provided with a power source or a hydraulic system, have high cost and are inconvenient to maintain, and are difficult to adapt to the use requirements of ships. SUMMARY

[0004] The purpose of the present application is to solve the problem in the prior art that the crane cannot realize manual emergency release of the load through a simple structure and mode, and cannot meet the use requirements of ships.

[0005] In order to achieve the above purpose, the present application provides a crane, comprising:

[0006] a steel wire rope;

[0007] a winding mechanism, one end of the steel wire rope being connected with the winding mechanism, the winding mechanism being used for winding and unwinding the steel wire rope, and the winding mechanism being provided with a normally closed brake;

[0008] two fixing structures, the other end of the steel wire rope sequentially passing through the two fixing structures, the fixing structures being used for fixing the steel wire rope, and the two fixing structures being spaced apart;

[0009] a movable pulley, a middle part of the steel wire rope passing around the movable pulley, and a lifting appliance being arranged on the movable pulley, the lifting appliance being used for connecting with a load.

[0010] Optionally, the winding mechanism comprises:

[0011] a drum, one end of the steel wire rope being connected with the drum;

[0012] a driving mechanism, the driving mechanism being connected with the drum.

[0013] Optionally, the normally closed brake includes a holding brake connected to the drum or the drive mechanism and used to prevent the drum from rotating.

[0014] Optionally, the drive mechanism includes a drive motor and a reducer.

[0015] Optionally, the drum is connected to the hull via a base.

[0016] Optionally, the two fixing structures are fixed to the hull at an interval, one above the other.

[0017] Optionally, the fixing structure includes a cylindrical component with a through hole formed inside the cylindrical component. The steel wire rope passes through the through hole, and a set screw is threaded onto the wall of the through hole to fix the steel wire rope inside the through hole.

[0018] Optionally, the lifting device includes a hook for lifting the load.

[0019] The present invention also provides a manual emergency release method for a crane, based on the above-described crane, comprising:

[0020] Step 1: Release the wire rope from the fixed structure located away from the moving pulley;

[0021] Step 2: Lengthen the steel wire rope between the two fixed structures by pulling it to a set length;

[0022] Step 3: Restore the wire rope to a fixed structure away from the movable pulley;

[0023] Step 4: Release the other fixed structure near the movable pulley from fixing the wire rope, so that the movable pulley, lifting device and load can be lowered;

[0024] Repeat steps 1 through 4 until the load is released.

[0025] Optionally, the set length is 40-60cm.

[0026] This invention provides a crane and its manual emergency release method, which has the following advantages: The crane has two fixed structures spaced apart for fixing the other end of a wire rope, and a sufficiently long wire rope section is reserved on the outside of the fixed structure away from the moving pulley. When one end of the wire rope is locked by a normally closed brake in an emergency, the fixing of the wire rope by the fixed structure away from the moving pulley can be released first. Then, by pulling the wire rope, the wire rope between the two fixed structures is lengthened to a set length, and the fixing of the wire rope by the fixed structure away from the moving pulley is restored. After that, the fixing of the wire rope by the other fixed structure near the moving pulley is released, which allows the moving pulley, lifting device, and load to descend. Repeating the above operation can complete the manual emergency safe descent and release of the load, which not only meets the specifications but also adopts a simple structure and simple operation method.

[0027] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0028] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0029] Figure 1 A schematic diagram of a crane according to an embodiment of the present invention is shown.

[0030] Figure 2 A flowchart of a manual emergency release method for a crane according to an embodiment of the present invention is shown.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Wire rope; 2. Fixed structure; 3. Moving pulley; 4. Lifting device; 5. Load; 6. Drum; 7. Drive motor; 8. Reducer; 9. Base; 10. Top screw; 11. Reserved section; 12. Release section. Detailed Implementation

[0033] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0034] like Figure 1 As shown, the present invention provides a crane, comprising:

[0035] Wire rope 1;

[0036] The winding mechanism is connected to one end of the wire rope 1. The winding mechanism is used to wind up and unwind the wire rope 1, and the winding mechanism is equipped with a normally closed brake.

[0037] Two fixed structures 2 are provided, and the other end of the wire rope 1 passes through the two fixed structures 2 in sequence. The fixed structures 2 are used to fix the wire rope 1, and the two fixed structures 2 are set at intervals.

[0038] The movable pulley 3 is surrounded by a steel wire rope 1 that passes around the middle of the movable pulley 3. A lifting device 4 is provided on the movable pulley 3 for connecting to the load 5.

[0039] Specifically, to address the problem that existing cranes cannot achieve manual emergency release of load 5 through simple structures and methods, thus failing to meet the requirements for marine use, the crane provided by this invention has two fixed structures 2 spaced apart to fix the other end of the wire rope 1. A sufficiently long pre-reserved section 11 of the wire rope 1 is reserved on the outside of the fixed structure 2 furthest from the moving pulley 3. If one end of the wire rope 1 is locked by a normally closed brake in an emergency, the fixing of the wire rope 1 by the fixed structure 2 furthest from the moving pulley 3 can be released first. Then, by pulling the wire rope 1, the wire rope 1 between the two fixed structures 2 is lengthened to a set length, and the fixing of the wire rope 1 by the fixed structure 2 furthest from the moving pulley 3 is restored. Afterwards, the fixing of the wire rope 1 by the other fixed structure 2 closest to the moving pulley 3 is released, allowing the moving pulley 3, the lifting device 4, and the load 5 to descend. Repeating the above operation completes the manual emergency safe descent and release of load 5, meeting both regulatory requirements and employing a simple structure and operation method.

[0040] Optionally, the winding mechanism includes:

[0041] Drum 6, one end of wire rope 1 is connected to drum 6;

[0042] The drive mechanism is connected to the drum 6.

[0043] Specifically, the winding mechanism drives the drum 6 to rotate through the drive mechanism, thereby winding and unwinding the wire rope 1 and thus raising and lowering the load 5.

[0044] Optionally, the normally closed brake includes a holding brake connected to the drum 6 or the drive mechanism and used to prevent the drum 6 from rotating.

[0045] Specifically, a normally closed brake is used. Once the winding mechanism loses power or malfunctions, the brake automatically stops the rotation of the drum 6, thereby locking one end of the wire rope 1.

[0046] Optionally, the drive mechanism includes a drive motor 7 and a reducer 8.

[0047] Specifically, the drive motor 7 is connected to the drum 6 through the reducer 8 to drive the rotation of the drum 6.

[0048] Optionally, the drum 6 is connected to the hull via the base 9.

[0049] Specifically, the crane is installed on a ship, and bases 9 are provided at both ends of the drum 6. The drum 6 is rotatably connected to the ship through the bases 9.

[0050] Optionally, two fixed structures 2 are fixed to the hull at an interval, one above the other.

[0051] Specifically, the two fixed structures 2 are fixed to the hull vertically in sequence. A special fixing frame can be set up to install the two fixed structures 2. The upper fixed structure 2 is away from the movable pulley 3, while the lower fixed structure 2 is close to the movable pulley 3.

[0052] Optionally, the fixing structure 2 includes a cylindrical component with a through hole formed inside. The wire rope 1 passes through the through hole, and the hole wall is threaded with a set screw 10 for fixing the wire rope 1 inside the through hole.

[0053] Specifically, the steel wire rope 1 passes through the through hole inside the fixed structure 2, and the diameter of the hole matches the diameter of the steel wire rope 1. The set screw 10 is arranged radially along the cylindrical component. When the set screw 10 is tightened, the steel wire rope 1 inside the through hole can be tightened and fixed to prevent the steel wire rope 1 from sliding axially.

[0054] Optionally, the lifting device 4 includes a hook for lifting the load 5.

[0055] Specifically, the lifting device 4 can be a hook to hook the load 5, and the upper end of the hook is connected to the middle of the movable pulley 3.

[0056] like Figure 2 As shown, the present invention also provides a manual emergency release method for a crane, based on the above-described crane, comprising:

[0057] Step 1: Release the fixing structure 2, which is away from the movable pulley 3, from the steel wire rope 1;

[0058] Step 2: By pulling the steel wire rope 1, the steel wire rope 1 located between the two fixed structures 2 is lengthened to a set length;

[0059] Step 3: Restore the fixation of the wire rope 1 to a fixed structure 2 away from the movable pulley 3;

[0060] Step 4: Release the other fixed structure 2 near the movable pulley 3 from fixing the wire rope 1, so that the movable pulley 3, the lifting device 4 and the load 5 can be lowered;

[0061] Repeat steps 1 through 4 until load 5 is released.

[0062] Specifically, when using the aforementioned crane, a pre-reserved section 11 of wire rope 1 of sufficient length is reserved on the outside of a fixed structure 2 away from the movable pulley 3, for use in emergency release of the wire rope 1 and the load 5; the wire rope 1 between the two fixed structures 2 forms a release section 12. When the fixed structure 2 away from the movable pulley 3 is released from fixing the wire rope 1, the release section 12 can be lengthened by manual pulling. The wire rope 1 of the set length can be released when the fixed structure 2 away from the movable pulley 3 is restored to fix the wire rope 1, and then the fixed structure 2 close to the movable pulley 3 is released from fixing the wire rope 1. The release section 12 of the wire rope 1 slides relative to the other fixed structure 2 close to the movable pulley 3 due to the tension of the load 5, and the load 5 drops a certain distance accordingly.

[0063] Optionally, the length can be set to 40-60cm.

[0064] Specifically, the length of the release segment 12 that is increased at one time should not be too long to avoid releasing too much load 5 at once, nor should it be too short to avoid affecting the efficiency of manual emergency release.

[0065] In summary, the manual emergency release method for a crane provided by the present invention, based on the above-mentioned crane, takes a shipboard use as an example: the crane on the ship suddenly loses power during operation, the brake locks the drum 6, and the load 5 is suspended in the air. The manual emergency release method for the crane described above is required to lower the load 5 to the deck. Initial state: Both fixed structures 2 are tightened, the wire rope 1 is tensioned, and the load 57 is stationary; Adjusting the release section 12 of the wire rope 1: The operator uses a wrench to loosen the top screw 10 of the upper fixed structure 2, manually pulls the wire rope 1 out 50cm from the upper fixed structure 2, and then tightens the loosened top screw 10 with a wrench; Releasing the wire rope 1: Slowly loosen the top screw 10 of the lower fixed structure 2 with a wrench to reduce the pressure on the wire rope 1. At this time, the load 5 pulls down the pulley 3 under the action of gravity, and the release section 12 of the wire rope 1 is gradually straightened. At the same time, the wire rope 1 slides relative to the lower fixed structure 2 because the tension of the load 5 overcomes the friction of the top screw 10, and its length increases, and the load 5 drops accordingly; Cyclic operation: Repeat the above steps, releasing a part of the wire rope 1 each time, so that the load 5 gradually drops. After several cycles, the load 5 is safely lowered to the deck, completing the manual emergency release.

[0066] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A crane, characterized in that, include: Wire rope; A winding mechanism is provided, one end of the wire rope is connected to the winding mechanism, the winding mechanism is used to wind up and unwind the wire rope, and the winding mechanism is equipped with a normally closed brake. Two fixing structures are provided, and the other end of the steel wire rope passes through the two fixing structures in sequence. The fixing structures are used to fix the steel wire rope, and the two fixing structures are spaced apart. A movable pulley is provided, the middle part of the wire rope passes around the movable pulley, and a lifting device is provided on the movable pulley for connecting to the load.

2. The crane according to claim 1, characterized in that, The winding mechanism includes: A drum, one end of the wire rope being connected to the drum; A drive mechanism, which is connected to the drum.

3. The crane according to claim 2, characterized in that, The normally closed brake includes a holding brake connected to the drum or the drive mechanism and used to prevent the drum from rotating.

4. The crane according to claim 2, characterized in that, The drive mechanism includes a drive motor and a reducer.

5. The crane according to claim 2, characterized in that, The drum is connected to the hull via a base.

6. The crane according to claim 1, characterized in that, The two fixed structures are fixed to the hull at an interval, one above the other.

7. The crane according to claim 1, characterized in that, The fixing structure includes a cylindrical component with a through hole inside. The steel wire rope passes through the through hole, and a set screw is threaded to the wall of the through hole to fix the steel wire rope inside the through hole.

8. The crane according to claim 1, characterized in that, The lifting device includes a hook for lifting the load.

9. A manual emergency release method for a crane, based on the crane according to any one of claims 1-8, characterized in that, include: Step 1: Release the wire rope from the fixed structure located away from the moving pulley; Step 2: Lengthen the steel wire rope between the two fixed structures by pulling it to a set length; Step 3: Restore the wire rope to a fixed structure away from the movable pulley; Step 4: Release the other fixed structure near the movable pulley from fixing the wire rope, so that the movable pulley, lifting device and load can be lowered; Repeat steps 1 through 4 until the load is released.

10. The manual emergency release method for a crane according to claim 9, characterized in that, The set length is 40-60cm.

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