Electric release device for an air cargo sling
By designing an electric release device that utilizes the lever principle and motor drive, the problem of non-reusability of pyrotechnic cutters was solved, enabling rapid, safe, and reliable cutting of hoisting ropes for air cargo and improving the ease of use and reusability of the device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JIANGXI HONGDU AVIATION IND GRP
- Filing Date
- 2023-10-23
- Publication Date
- 2026-06-09
AI Technical Summary
In current air cargo hoisting processes, the use of pyrotechnic cutters is subject to storage and usage restrictions, and they are not reusable, making it difficult to achieve fast and safe rope cutting.
Design an electric release device that utilizes the lever principle and motor drive. Through the cooperation of connecting rod and crank, it can achieve rope fixation and reliable unlocking. A contact switch is used to control the motor brake to ensure the safety and reusability of the device.
It enables rapid, safe, and reliable cutting of ropes, improves the ease of use and reusability of air cargo hoisting, and avoids the restrictions on the use of pyrotechnics.
Smart Images
Figure CN117429604B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of aviation equipment design, and specifically relates to an electric release device for an aviation cargo lifting sling. Background Technology
[0002] During the hoisting of special cargo by aircraft, the cargo needs to maintain a certain tilt during the flight phase. In the preparation phase for descent, to maintain aircraft stability, part of the hoisting sling needs to be secured with ropes. Once the aircraft's speed has stabilized, the ropes are cut, and the secured hoisting sling is released. The rope-cutting process must be fast and safe.
[0003] The current method of releasing ropes uses a cutter to cut the rope. The cutter contains gunpowder, which detonates when electricity is applied, and the force of the gunpowder propels the blade to cut the rope. Because the cutter is a pyrotechnic device, its storage, transportation, and use are subject to strict requirements; the cutter cannot be reused and is a consumable item. Summary of the Invention
[0004] To improve the ease of use and reusability of aircraft release devices and replace the use of pyrotechnics, this invention designs an electric release device for cutting ropes on lifting slings.
[0005] This invention proposes an electrically operated release device for securing and releasing air cargo lifting slings. The device includes a limiting block fixed to the aircraft body, a rope F, a rocker arm A, and a crank C. The limiting block has a lever E and a slot. A connecting rod B is located between the rod portion of the rocker arm A and the movable end of the crank C. The movable end of the rope F has a collar. The crank C is controlled by a motor, which supports or releases one end of the lever E via the rocker arm A, and the other end of the lever E locks the collar in or releases it from the slot.
[0006] Advantageously, the connecting rod B and the crank C have contact switches. When the connecting rod B and the crank C are in the same straight line, the contact switches are simultaneously turned on to energize the motor brake disc and lock the motor shaft.
[0007] Advantageously, the fixed end of the rope F is fixed to the limiting block.
[0008] Advantageously, the lever E is hinged to the limiting block.
[0009] Advantageously, in the locked state, the end of the lever E seals the opening of the slot.
[0010] Advantageously, in the locked state, the rocker A vertically supports the lever E.
[0011] Advantageously, the end of the rocker A has a supporting ball.
[0012] Advantageously, link B is hinged to the upper part of rocker A.
[0013] Beneficial effects: This invention eliminates the need for pyrotechnics, has the advantages of strong locking force, fast unlocking, and safety and reliability, and the ropes for fixing the hoisting sling can be reused, resulting in a high degree of automation. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the electric release device in the locked state;
[0015] Figure 2 This is a schematic diagram of the electrically released device in the unlocked state. Detailed Implementation
[0016] This invention utilizes the motion characteristics of the dead point of a four-bar linkage and the lever amplification principle to achieve a release device with high load-bearing capacity, fast response, and reliable operation.
[0017] Figure 1 When the electric release device is locked, the lifting sling is secured with rope F. One end of rope F is fixed to the aircraft fuselage, and the other end has a loop that fits onto one end of lever E and is held in the groove of the limiting block. The lifting sling carrying the cargo is tightened by rope F, generating tension. With rope F under tension, the loop of rope F exerts an upward pull on the right end of lever E. Through the lever action, the left end of lever E exerts a certain downward pressure on rocker arm A. Crank C, driven by a motor, can rotate around its axis. At this time, connecting rod B and crank C are aligned, the device is at its dead center, and rocker arm A remains stationary. Rocker arm A can withstand the large pressure applied by the left end of lever E.
[0018] A contact switch is installed on both connecting rod B and crank C. When connecting rod B and crank C are in the same straight line, the two contact switches are turned on simultaneously to energize the motor brake disc, locking the motor shaft and keeping the device in the dead position at this time.
[0019] Figure 2 When the electric release device is unlocked, crank C is driven by the motor to rotate clockwise by a certain angle at an angular velocity ω, which drives connecting rod B and rocker A to move. The supporting force of the top of rocker A on lever E gradually decreases. Lever E rotates counterclockwise and its end opens at the same time. The loop of rope F is disengaged from the slot, releasing the fixation of the lifting sling.
Claims
1. An electric release device for an air cargo lifting sling, used for securing and releasing the air cargo lifting sling, characterized in that: The device includes a limiting block fixed to the machine body, a rocker arm A, and a crank C. The limiting block has a rope F, a lever E, and a slot. The lever E is hinged to the limiting block. A connecting rod B is located between the lever A and the movable end of the crank C. A contact switch is located on the connecting rod B and the crank C. When the connecting rod B and the crank C are in a straight line, the contact switch simultaneously conducts, energizing the motor brake disc and locking the motor shaft. The movable end of the rope F has a collar, and the fixed end of the rope F is fixed to the limiting block. The crank C is controlled by a motor. The rocker arm A supports or releases one end of the lever E, and the other end of the lever E locks the collar in or releases it from the slot.
2. The electric release device for the air cargo lifting sling according to claim 1, characterized in that: In the locked state, the end of the lever E seals the opening of the slot.
3. The electric release device for the air cargo lifting sling according to claim 2, characterized in that: In the locked state, the rocker arm A vertically supports the lever E.
4. The electrically released device for air cargo lifting slings according to claim 3, characterized in that: The end of the rocker A has a supporting ball.
5. The electrically released device for air cargo lifting slings according to claim 1, characterized in that: Link B is hinged to the upper part of rocker A.