guide pulley

Abstract

The present invention discloses a guide pulley, comprising a pulley shaft, a pulley sleeve, a pulley, and an adjusting bolt. The pulley sleeve is pressed into the pulley hole, and the pulley and pulley sleeve are mounted on a cylindrical structure at the bottom of the pulley shaft through a shaft hole. The adjusting bolt is screwed into the threaded hole of the cylindrical structure of the pulley shaft to a set depth, and the waist-shaped hole of the adjusting bolt is aligned with the hole on the pulley shaft. A pin is sequentially inserted through the corresponding hole on one side of the pulley shaft, the adjusting bolt, and the hole on the other side of the pulley shaft. The present invention achieves mutual coordination between the airdrop platform and the central guide rail of the transport aircraft, allowing the airdrop platform to move smoothly along the central guide rail while meeting the limited overload coefficient requirements in the loading guidelines of military transport aircraft and the sudden overload requirements of the carrier aircraft.

Description

Technical Field

[0001] The invention relates to the field of heavy equipment airdrop, in particular to a guide pulley. Background Art

[0002] At present, the floor of large domestic transport aircraft is generally equipped with a central guide rail, and the airdrop platform needs to be equipped with corresponding components to match the central guide rail (see the diagram for the matching diagram). Figure 7 ), thereby realizing the loading and unloading of the airdrop cargo platform on the transport aircraft and the working process of the airdrop cargo platform leaving the transport aircraft during the airdrop operation. At the same time, during the transportation process, the component should be able to limit the airdrop cargo platform with the help of the central guide rail and meet the secondary movement restriction requirements in the national military standard.

[0003] The current solution is a guide block. The guide block utilizes two rotatable working components that interact with the central rail. When the working components reach their maximum rotation angle in one direction, they are locked in place, meeting the secondary restraint requirement. When the platform leaves the central rail, the working components are spring-loaded and retracted into the guide block for protection.

[0004] When the cargo platform slides along the central guide rail, there is sliding friction between the guide block and the central guide rail of the aircraft, which causes certain damage to the central guide rail of the aircraft and the guide block. In addition, the adjustment of the guide block requires special tools, which is more cumbersome to use. Summary of the Invention

[0005] The object of the present invention is to provide a guide pulley.

[0006] The technical solution for achieving the purpose of the present invention is as follows: a guide pulley comprises a pulley shaft, a pulley sleeve, a pulley and an adjusting bolt;

[0007] The pulley sleeve is pressed into the pulley hole, and the pulley and the pulley sleeve are installed on the cylindrical structure at the bottom of the pulley shaft through the shaft hole. The adjusting bolt is screwed into the threaded hole of the cylindrical structure of the pulley shaft to the set depth, and the waist-shaped hole of the adjusting bolt is aligned with the three holes on the pulley shaft. The pin is used to pass through the corresponding hole on one side of the pulley shaft, the adjusting bolt and the hole on the other side of the pulley shaft in sequence.

[0008] Compared with the prior art, the present invention has the following significant advantages: (1) the cargo platform system is controlled by the guide pulley to be loaded into and out of the aircraft along the central guide rail of the aircraft, and the lateral or vertical movement of the cargo platform system is limited when lateral or vertical loads occur; (2) the friction between the guide pulley and the central guide rail is rolling friction, which can greatly reduce the damage to the guide pulley and the central guide rail; (3) the adjustment of the guide pulley is achieved by threaded engagement, and the operator can easily complete the operation by hand-tightening, eliminating the trouble of using, transporting, and storing additional tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of a guide pulley of the present invention.

[0010] Figure 2 It is a schematic diagram of the pulley shaft.

[0011] Figure 3 It is a diagram of a pulley set.

[0012] Figure 4 It is a diagram of a pulley.

[0013] Figure 5 This is a schematic diagram of the adjusting bolt.

[0014] Figure 6 It is the general assembly drawing.

[0015] Figure 7 This is a schematic diagram of the airdrop cargo platform cooperating with the aircraft's central rail through existing components. DETAILED DESCRIPTION

[0016] The present invention is mainly used in the field of heavy-duty airdrop, realizing the mutual coordination between the airdrop cargo platform and the central guide rail of the transport aircraft, so that the airdrop cargo platform can move smoothly along the central guide rail while meeting the limited overload coefficient requirements in the loading criteria of military transport aircraft and the sudden peak overload requirements of the carrier aircraft.

[0017] In order to install and assemble other parts on the cargo platform, a guide pulley shaft is designed for the guide pulley; in order to achieve the coordination between the guide pulley and the central guide rail of the aircraft, a pulley is designed for the guide pulley; in order to reduce the friction between the pulley and the pulley shaft and avoid adhesive wear, a pulley sleeve is designed for the guide pulley; in order to achieve the adjustable height of the guide pulley, an adjusting bolt is designed; in order to lock the height after adjustment, a pin is designed; in order to enable the guide pulley to be retracted, a pulley rope and a tension spring connecting the guide pulley and the cargo platform are designed.

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] The guide pulley 7 is mainly composed of a pulley shaft 1, a pulley sleeve 3, a pulley 2 and an adjusting bolt 4. The parts that match the guide pulley and the cargo platform include bolts and nuts, a pulley steel rope 8 and a tension spring 9.

[0020] The schematic diagram of the guide pulley is shown in Figure 1 The pulley sleeve (3) is pressed into the hole of the pulley (2). The pulley 2 and the pulley sleeve 3 are mounted on the cylindrical structure of the pulley shaft (1) through the shaft hole. The adjusting bolt (4) is screwed into the threaded hole of the pulley shaft 1 to a certain depth and the waist-shaped hole of the adjusting bolt 4 is aligned with the φ6.5mm through-hole on the pulley shaft 1. The latch (5) is sequentially passed through the corresponding hole position on one side of the pulley shaft 1, the adjusting bolt 4 and the hole position on the other side of the pulley shaft 1.

[0021] The schematic diagram of the pulley shaft 1 is shown in Figure 2 The pulley shaft 1 is made of alloy steel. The upper part is a special-shaped structure with two through holes of φ12.7mm and φ17mm. The φ12.7mm through hole cooperates with the limit hole on the cargo platform, and the rotation of the guide pulley is limited by the limit pin. The φ17mm through hole cooperates with the mounting hole on the cargo platform, and the guide pulley is installed on the cargo platform using bolts and nuts. Next to the φ12.7mm through hole is a structure similar to a bird's beak, which is used to connect the pulley rope 8. A φ6.5mm through hole is opened in the middle of the pulley shaft for installing the pin.

[0022] The lower part of the pulley shaft 1 is a cylindrical structure, and the interior of the pulley shaft 1 is a φ27mm blind hole and an M24 threaded hole for installing and cooperating with the adjusting bolt 4.

[0023] The schematic diagram of the pulley sleeve 3 is shown in FIG. Figure 3 The pulley sleeve 3 is a shaft sleeve structure made of copper alloy. One end of the pulley sleeve 3 has a 5mm high step structure, a maximum outer diameter of 66mm, an outer diameter of 55mm, an inner diameter of 46mm, and an overall height of 50mm.

[0024] The schematic diagram of pulley 2 is shown in Figure 4 . Pulley 2 is a shaft sleeve structure, and its material is alloy steel. There is a step structure similar to a right-angled trapezoid at one end, with a maximum outer diameter of 105mm, an outer diameter of 65mm, an inner diameter of 55mm, an angle between the hypotenuse of the right-angled trapezoid and the axial direction of 73°, and an overall height of pulley 2 of 54mm. The end of the pulley 2 with the right-angled trapezoidal step has a groove of φ95mm, 4.5mm high, and a groove of φ67mm, 4.5mm high, which correspond to the adjusting bolt 4 and the pulley sleeve 3 respectively.

[0025] The schematic diagram of the adjusting bolt 4 is shown in Figure 5 Adjustment bolt 4 is similar in structure to a slotted bolt and is made of alloy steel. It is not fully threaded, with a total bolt length of 96mm. The M24×1.5 thread length is 43mm. There is a 3mm-long undercut after the threaded section, followed by a 26mm-diameter, unthreaded section. A waist-shaped through-hole with a center-to-center distance of 23mm and a width of 6.5mm is provided in the threaded section. This hole is used to engage a latch to lock the height of the guide pulley.

[0026] The general assembly process is as follows:

[0027] See the general assembly drawing Figure 6 . Use bolts and nuts to fix the guide pulley 7 on the cargo platform, then connect one end of the pulley steel rope 8 to the bird's beak-shaped part of the guide pulley 7, and the other end to the tension spring 9, and the other end of the tension spring 9 is connected to the cargo platform 6.

[0028] The main working process of the guide pulley is as follows:

[0029] 1) When loading the airdrop platform into the transport aircraft, turn the guide pulley downward 90°, put it in working state, and lock the guide pulley with a latch.

[0030] 2) When the cargo platform is loaded into the transport cabin and limited in a fixed position, if it is necessary to adjust the distance between the guide pulley and the central guide rail, you can remove the pin, rotate the adjusting bolt to adjust the distance between the guide pulley and the central guide rail to the appropriate distance, and then install the pin.

[0031] 3) During airdrop, when the cargo platform leaves the cargo hold of the transport aircraft, the locking pin is pulled out, releasing the guide pulley. Under the action of the tension spring, the guide pulley rotates upward to a horizontal position to prevent damage during landing.

[0032] The guide pulley mainly realizes the following functions:

[0033] 1) Before the cargo platform is loaded into the transport aircraft cabin, the guide pulley, which is kept horizontal by the pulley rope and tension spring, is rotated downward until the limit hole is concentric with the limit hole on the cargo platform. The guide pulley is locked with a limit pin (the pin passes through the limit hole of the guide pulley). During the process of loading the cargo platform into the transport aircraft cabin, it cooperates with the central guide rail of the transport aircraft to play a limiting role.

[0034] 2) After the cargo platform system enters the cabin and is locked, pull out the latch on the guide pulley and rotate the adjustment bolt outward or inward to adjust the gap between the central guide rail flange and the guide pulley. After adjustment, reinsert the latch into its original position;

[0035] 3) When the cargo platform moves along the central guide rail and leaves the aircraft, the suspension system is straightened by the parachute system in the air, the limit pin locking the guide pulley is pulled out, and the guide pulley rotates to a horizontal position under the tension of the pulley rope spring, preventing damage to the guide pulley when the cargo platform lands.

[0036] The present invention has been tested in actual airdrops and has realized the designed functions and achieved the expected effects.

Claims

1. A guide pulley, characterized in that: It includes a pulley shaft (1), a pulley sleeve (3), a pulley (2) and an adjusting bolt (4); The pulley sleeve (3) is pressed into the hole of the pulley (2), and the pulley (2) and the pulley sleeve (3) are mounted on the cylindrical structure at the bottom of the pulley shaft (1) through the shaft hole. The adjusting bolt (4) is screwed into the threaded hole of the cylindrical structure of the pulley shaft (1) to a set depth, and the waist-shaped hole of the adjusting bolt (4) is aligned with the hole three on the pulley shaft (1). The latch (5) is sequentially passed through the corresponding hole position on one side of the pulley shaft (1), the adjusting bolt (4) and the hole position on the other side of the pulley shaft (1); The pulley shaft (1) is made of alloy steel; its upper part is a special-shaped structure, with two through holes, hole 1 and hole 2, opened from top to bottom. Hole 1 cooperates with the limit hole on the cargo platform (6), and the rotation of the guide pulley is limited by the limit pin. Hole 2 cooperates with the mounting hole on the cargo platform (6), and the guide pulley is installed on the cargo platform (6) using bolts and nuts; the upper part where hole 1 is located is similar to a bird's beak structure, which is used to connect the pulley steel rope (8); hole 3 is opened in the middle of the pulley shaft (1) for installing the pin; the lower part of the pulley shaft (1) is a cylindrical structure, and a blind hole and an M24 threaded hole are provided inside the pulley shaft (1) for installing and matching the adjusting bolt (4).

2. The guide pulley according to claim 1, characterized in that: The pulley sleeve (3) is a shaft sleeve structure, and the material is copper alloy; A step structure is provided at one end.

3. The guide pulley according to claim 1, characterized in that: The pulley (2) is a shaft sleeve structure, and the material is alloy steel; One end of the pulley (2) has a step structure similar to a right-angled trapezoid. The end of the pulley (2) having the right-angled trapezoidal step has two grooves, which respectively correspond to the adjusting bolt (4) and the pulley sleeve (3).

4. The guide pulley according to claim 1, characterized in that: The adjusting bolt (4) has a structure similar to a slotted bolt and is made of alloy steel. The adjusting bolt (4) is a non-full threaded structure, with a back-off groove provided behind the threaded section, and a non-threaded section behind the back-off groove. A waist-shaped through hole is provided on the threaded section for cooperating with a latch pin to lock the height of the guide pulley.

5. The guide pulley according to claim 1, characterized in that: The parts that cooperate with the guide pulley and the cargo platform (6) include bolts and nuts, a pulley steel rope (8) and a tension spring (9). The guide pulley is fixed to the cargo platform (6) using bolts and nuts, and then one end of the pulley steel rope (8) is connected to the bird's beak-shaped part of the guide pulley, and the other end is connected to the tension spring (9), and the other end of the tension spring (9) is connected to the cargo platform (6).

Images