Anti-rotation device for stretcher during helicopter hoisting

Abstract

The invention discloses a stretcher rotation prevention device for the process of helicopter hoisting, comprising an emergency stretcher, a hoisting structure connected to the emergency stretcher, the hoisting structure comprising a hanger, a center column, a hoisting ring, a main hoisting rope and a locking sleeve, and the locking sleeve is slidably connected to the center column. The invention provides a locking sleeve on the hoisting structure, so that when the emergency stretcher is hoisted by the hoisting structure, the top of the locking sleeve can slide downward along the center column by pulling the pull rope downward, so that the convex teeth at the top of the locking sleeve will be separated from the tooth grooves at the bottom surface of the fixed seat, so that the main hoisting rope with torque can drive the hoisting ring to rotate at the top of the center column, thereby eliminating the torque generated when the main hoisting rope is tightened, and preventing the emergency stretcher from rotating when it is hoisted.

Description

Technical Field

[0001] The invention belongs to the technical field of emergency equipment, in particular to a stretcher anti-rotation device used in a helicopter hoisting process. Background Art

[0002] Helicopter rescue is the use of helicopters for emergency rescue. It can reach work sites that are inaccessible by water or land more quickly to carry out search and rescue, material transportation, air command and other tasks. There are many forms of helicopter rescue. When rescuing the wounded in a location where it is inconvenient for the helicopter to park, the wounded are usually tied to a stretcher and the helicopter is used to directly lift the stretcher and the wounded for transfer and treatment.

[0003] Patent CN202022263322.9 discloses a helicopter-mounted anti-rotation stretcher. The helicopter-mounted anti-rotation stretcher provided by the patent includes an emergency stretcher body and an anti-rotation rudder connected to the emergency stretcher body through a rotatable shaft. The helicopter-mounted anti-rotation stretcher of the patent can effectively suppress the self-spinning effect of the stretcher during the lifting process, ensuring the installation and transfer of the wounded fixed on the stretcher. However, when using a helicopter-mounted stretcher, the rope used for lifting will gradually straighten as the helicopter rises, causing torque to appear in the straightened rope. As the rope straightens, the rope will spontaneously rotate in order to eliminate the torque, so that the rope will drive the stretcher hanging below to rotate, which will affect the wounded in the stretcher.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a stretcher rotation prevention device used in the process of helicopter hoisting, so as to solve the above-mentioned problems in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides a stretcher rotation prevention device for use in a helicopter hoisting process, comprising an emergency stretcher, the emergency stretcher being connected to a hoisting structure, the emergency stretcher being hoisted by a helicopter through the hoisting structure, the hoisting structure comprising a hanger, a center column penetrating the hanger and fixedly connected to the hanger, a hanging ring arranged above the center column, a main hoisting rope bolted to the hanging ring, and a locking sleeve sleeved at the periphery of the center column, a fixing seat being fixed to the bottom end of the hanging ring, the locking sleeve being located below the fixing seat and slidably connected to the center column.

[0007] In the technical solution of the present invention, a pair of lifting rings are fixed at the top positions of the left and right edges of the emergency stretcher, the hanger is in an X shape, and lifting ropes are fixed at the four ends of the hanger. The ends of the lifting ropes are tied with hooks, and the four hooks are respectively hung on the four lifting rings.

[0008] In the technical solution of the present invention, a plurality of guide plates are fixed to the bottom surface of the emergency stretcher, and the plurality of guide plates are parallel to each other.

[0009] In the technical solution of the present invention, a hanging block is provided at the bottom end of the central column, and the hanging block is fixed to the bottom surface of the hanger.

[0010] In the technical solution of the present invention, the outer surface of the top of the center column is threaded, and a transparent sleeve hole is opened on the bottom surface of the fixing seat. After the top of the center column passes through the sleeve hole, a retaining ring is sleeved on the periphery of the center column. The bottom surface of the retaining ring is abutted against the top surface of the fixing seat, and a nut is threadedly connected to the top end of the center column.

[0011] In the technical solution of the present invention, the locking sleeve is a cylindrical structure, a sleeve cavity is opened in the middle of the locking sleeve, the center column passes through the sleeve cavity, a plurality of slots are opened on the inner wall of the sleeve cavity, a plurality of convex strips are embedded on the outer surface of the center column, and the convex strips pass through the slots.

[0012] In the technical solution of the present invention, a plurality of convex teeth are arranged in a ring shape at equal intervals on the top of the locking sleeve, and a plurality of tooth grooves are opened on the bottom surface of the fixing seat. The size of the tooth grooves is adapted to the size of the convex teeth, and the number of the tooth grooves is equal to the number of the convex teeth and the positions correspond one to one.

[0013] In the technical solution of the present invention, a spring is sleeved on the outer periphery of the bottom of the central column, the bottom end of the spring abuts against the top surface of the hanger, the top end of the spring abuts against the bottom surface of the locking sleeve, and the spring is in a pre-tightened state.

[0014] In the technical solution of the present invention, a fixing ring is fixed on the outer surface of the locking sleeve, a draw rope is fastened to the fixing ring, and a draw ring is fastened to the end of the draw rope.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0016] 1. In the present invention, by setting a locking sleeve on the lifting structure, when the emergency stretcher is lifted by using the lifting structure, the top end of the locking sleeve can be slid downward along the center column by pulling the pull rope downward, so that the protruding teeth at the top end of the locking sleeve will be disengaged from the tooth grooves at the bottom surface of the fixed seat, so that the main lifting rope with torque can drive the lifting ring to rotate at the top end of the center column, thereby eliminating the torque generated when the main lifting rope is tightened, and preventing the emergency stretcher from rotating when being lifted.

[0017] 2. In the present invention, by setting the guide plate at the bottom of the emergency stretcher, the guide plate can guide the airflow when the emergency stretcher is lifted and moved in the air, so that the emergency stretcher can maintain its direction when moving in the air, and prevent the emergency stretcher from rotating in the air due to the blowing of the airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a structural diagram of the emergency stretcher in the present invention;

[0020] Figure 3 This is a bottom structural diagram of the emergency stretcher of the present invention;

[0021] Figure 4 It is a structural diagram of the hoisting structure in the present invention;

[0022] Figure 5 It is a structural diagram of the hanger in the present invention;

[0023] Figure 6 It is an exploded view of the central column of the present invention;

[0024] Figure 7 This is a bottom structural diagram of the fixing seat in the present invention;

[0025] Figure 8 It is a schematic diagram of the installation of the locking sleeve in the present invention;

[0026] Fig. 9 It is a structural diagram of the locking sleeve in the present invention;

[0027] Fig.10 It is a top view of the locking sleeve in the present invention.

[0028] Description of reference numerals:

[0029] 1-First aid stretcher; 11-Lifting ring; 12-Deflector;

[0030] 2-lifting structure; 21-hanging bracket; 211-lifting rope; 212-lifting hook; 22-center column; 221-hanging block; 222-blocking ring; 223-nut; 224-convex strip; 225-spring; 23-lifting ring; 231-fixing seat; 232-hole; 233-tooth groove; 24-main lifting rope; 25-locking sleeve; 251-sleeve cavity; 252-slot; 253-convex tooth; 254-fixing ring; 255-pull rope; 256-pull ring. DETAILED DESCRIPTION

[0031] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0032] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0033] Reference Figure 1-Figure 10 The stretcher rotation prevention device for the helicopter hoisting process of the present invention comprises an emergency stretcher 1, and the emergency stretcher 1 is connected to a hoisting structure 2, and the hoisting structure 2 comprises a hanger 21, a central column 22 penetrating the hanger 21 and fixedly connected to the hanger 21, a hoisting ring 23 arranged above the central column 22, a main hoisting rope 24 bolted to the hoisting ring 23, and a locking sleeve 25 sleeved on the outer periphery of the central column 22, and the head end of the main hoisting rope 24 is fixed on the helicopter, so that the emergency stretcher 1 can be hoisted by the helicopter through the hoisting structure 2.

[0034] In the present invention, a pair of lifting rings 11 are fixed at the top positions of the left and right side edges of the emergency stretcher 1, the hanger 21 is in an X shape, and the four ends of the hanger 21 are fixed with lifting ropes 211, and the ends of the lifting ropes 211 are tied with hooks 212. By hanging the four hooks 212 on the four lifting rings 11 respectively, the lifting rings 11 and the hanger 21 can be connected through the lifting ropes 211, so that the emergency stretcher 1 is hung below the hanger 21 by the lifting ropes 211 through the lifting hooks 212.

[0035] Specifically, a hanging block 221 is provided at the bottom end of the central column 22 , and the hanging block 221 is fixed to the bottom surface of the hanger 21 , so that the hanger 21 and the central column 22 form a stable integral structure.

[0036] Furthermore, the hanging ring 23 is in an inverted U-shaped structure, a fixing seat 231 is fixed to the bottom end of the hanging ring 23, the outer peripheral surface of the top of the center column 22 is threaded, a transparent sleeve hole 232 is opened on the bottom surface of the fixing seat 231, the top of the center column 22 passes through the sleeve hole 232, and a retaining ring 222 is sleeved on the periphery of the center column 22, the bottom surface of the retaining ring 222 is against the top surface of the fixing seat 231, and the top end of the center column 22 is threadedly connected with a nut 223, and the retaining ring 222 can be screwed on the top end of the center column 22. 22 is restricted between the fixing seat 231 and the nut 223, so that the fixing seat 231 can restrict the center column 22 in the sleeve hole 232 through the retaining ring 222, and at the same time, the fixing seat 231 can rotate around the center column 22. When the emergency stretcher 1 is hoisted by the helicopter through the hoisting structure 2, the torsion formed by the straightening of the main sling 24 will drive the fixing seat 231 to rotate, thereby eliminating the torsion without affecting the emergency stretcher 1, preventing the main sling 24 from driving the emergency stretcher 1 to rotate and affecting the injured on the emergency stretcher 1.

[0037] In addition, the locking sleeve 25 is a cylindrical structure, with a sleeve cavity 251 provided in the middle of the locking sleeve 25, through which the center column 22 passes, and a plurality of slots 252 provided on the inner wall of the sleeve cavity 251. A plurality of convex strips 224 are embedded on the outer surface of the center column 22, through which the convex strips 224 pass, so that the locking sleeve 25 is located below the fixing seat 231 and can be slidably connected with the center column 22 under the action of the tooth groove 233. At the same time, the locking sleeve 25 is restricted to the outside of the center column 22 under the action of the convex strips 224, thereby preventing the locking sleeve 25 from axially rotating around the center column 22.

[0038] It is worth noting that the top of the locking sleeve 25 is provided with a plurality of convex teeth 253 at equal intervals in a ring shape, and the bottom surface of the fixing seat 231 is provided with a plurality of tooth grooves 233, the size of the tooth grooves 233 is adapted to the size of the convex teeth 253, the number of the tooth grooves 233 is equal to the number of the convex teeth 253 and the positions correspond one to one, and a spring 225 is sleeved on the outer periphery of the bottom of the central column 22, the bottom end of the spring 225 is against the top surface of the hanger 21, and the top end of the spring 225 is against the bottom surface of the locking sleeve 25. The spring 225 is in a pre-tightened state. Under the elastic force of the spring 225, the locking sleeve 25 is always pushed upward by the spring 225, so that the convex tooth 253 is inserted into the tooth groove 233, so that the center column 22 is restricted at the bottom of the fixing seat 231 under the action of the convex tooth 253, preventing the center column 22 from rotating, so that the center column 22 and the fixing seat 231 form an integral structure, avoiding the emergency stretcher 1 from rotating at the bottom of the main sling 24 under the action of the center column 22.

[0039] It is worth noting that a fixing ring 254 is fixed on the outer surface of the locking sleeve 25, a pull rope 255 is tied to the fixing ring 254, and a pull ring 256 is tied to the end of the pull rope 255. When the emergency stretcher 1 is hoisted by a helicopter, as the helicopter takes off, the main sling 24 is gradually tightened. At this time, people can pull the pull ring 256 downward to make the pull ring 256 drive the locking sleeve 25 to move downward along the central column 22 through the pull rope 255, so that the spring 225 is compressed. When the locking sleeve 25 moves downward, the convex teeth are pressed against the locking sleeve 25. When 253 is disengaged from the tooth groove 233, the center column 22 is freed from the restriction of the locking sleeve 25 and can rotate in the fixing seat 231, so that the torque generated when the main sling 24 is straightened drives the fixing seat 231 to rotate, thereby achieving the purpose of eliminating the torque of the main sling 24 and preventing the emergency stretcher 1 from rotating. When the torque of the main sling 24 is eliminated, the pull ring 256 is loosened, so that the locking sleeve 25 can return to its original position under the action of the spring 225, so that the fixing seat 231 and the center column 22 can form a whole again.

[0040] In addition, in order to prevent the emergency stretcher 1 from rotating due to the blowing of airflow when being lifted and moved by a helicopter, a plurality of guide plates 12 are fixed to the bottom surface of the emergency stretcher 1. The guide plates 12 are parallel to each other, so that when the emergency stretcher 1 is lifted and moved in the air, the guide plates 12 can guide the airflow, so that the emergency stretcher 1 can maintain its direction when moving in the air, and prevent the emergency stretcher 1 from rotating due to the blowing of airflow in the air.

[0041] The working principle of the stretcher rotation prevention device used in the helicopter hoisting process of the present invention is specifically as follows:

[0042] First, the head end of the main sling 24 is fixed on the helicopter, and the four slings 211 at the bottom of the hanger 21 are hung on the four rings 11 through the hooks 212, so that the rings 11 and the hanger 21 are connected through the slings 211, so that the emergency stretcher 1 is hung under the hanger 21 by the slings 211 through the hooks 212, and then the helicopter rises upward, so that the helicopter gradually lifts the emergency stretcher 1 upward through the lifting structure 2. During the rising process of the helicopter, the main sling 24 is gradually straightened, so that a torsion is generated on the main sling 24. Finally, as the main sling 24 is gradually straightened, people pull the pull ring 256 downward, so that the pull ring 256 drives the locking sleeve 25 to move downward along the central column 22 through the pull rope 255, so that the convex tooth 253 is disengaged from the tooth groove 233. At this time, the central column 22 can rotate in the fixed seat 231 because it loses the restriction of the locking sleeve 25, so that the torque generated when the main sling 24 is straightened drives the fixed seat 231 to rotate, thereby achieving the purpose of eliminating the torque of the main sling 24 and preventing the emergency stretcher 1 from rotating in the air.

[0043] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A stretcher rotation prevention device for use in a helicopter hoisting process, comprising an emergency stretcher (1), characterized in that: The emergency stretcher (1) is connected to a hoisting structure (2), and the emergency stretcher (1) is hoisted by a helicopter through the hoisting structure (2). The hoisting structure (2) comprises a hanger (21), a central column (22) penetrating the hanger (21) and fixedly connected to the hanger (21), a hoisting ring (23) arranged above the central column (22), a main hoisting rope (24) bolted to the hoisting ring (23), and a locking sleeve (25) sleeved on the periphery of the central column (22), a fixing seat (231) is fixed at the bottom end of the hanging ring (23), and the locking sleeve (25) is located below the fixing seat (231) and is slidably connected to the central column (22); The locking sleeve (25) is of cylindrical structure, a sleeve cavity (251) is provided in the middle of the locking sleeve (25), the central column (22) passes through the sleeve cavity (251), a plurality of slots (252) are provided on the inner wall of the sleeve cavity (251), a plurality of convex strips (224) are embedded on the outer surface of the central column (22), and the convex strips (224) pass through the slots (252); The top of the locking sleeve (25) is provided with a plurality of convex teeth (253) at equal intervals in a ring shape, and the bottom surface of the fixing seat (231) is provided with a plurality of tooth grooves (233), the size of the tooth grooves (233) is adapted to the size of the convex teeth (253), the number of the tooth grooves (233) is equal to the number of the convex teeth (253), and the positions correspond one to one; A spring (225) is sleeved on the periphery of the bottom of the central column (22), the bottom end of the spring (225) abuts against the top surface of the hanger (21), the top end of the spring (225) abuts against the bottom surface of the locking sleeve (25), and the spring (225) is in a pre-tightened state; A fixing ring (254) is fixed on the outer surface of the locking sleeve (25), a pull rope (255) is fastened to the fixing ring (254), and a pull ring (256) is fastened to the end of the pull rope (255).

2. The stretcher rotation prevention device for the helicopter hoisting process as claimed in claim 1, characterized in that: A pair of lifting rings (11) are fixed at the top positions of the left and right side edges of the emergency stretcher (1); the hanging frame (21) is in an X shape; four ends of the hanging frame (21) are fixed with lifting ropes (211); the ends of the lifting ropes (211) are connected with lifting hooks (212); and the four lifting hooks (212) are respectively hung on the four lifting rings (11).

3. The stretcher rotation prevention device for helicopter hoisting process as claimed in claim 1, characterized in that: A plurality of guide plates (12) are fixed to the bottom surface of the emergency stretcher (1), and the plurality of guide plates (12) are parallel to each other.

4. The stretcher rotation prevention device for helicopter hoisting process as claimed in claim 1, characterized in that: A hanging block (221) is provided at the bottom end of the central column (22), and the hanging block (221) is fixed to the bottom surface of the hanger (21).

5. The stretcher rotation prevention device for helicopter hoisting process as claimed in claim 1, characterized in that: The outer surface of the top of the center column (22) is threaded, and a transparent sleeve hole (232) is provided on the bottom surface of the fixing seat (231). After the top of the center column (22) passes through the sleeve hole (232), a retaining ring (222) is sleeved on the periphery of the center column (22), and the bottom surface of the retaining ring (222) abuts against the top surface of the fixing seat (231), and the top end of the center column (22) is threadedly connected with a nut (223).

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