Novel aircraft maintenance equipment oil cylinder

Abstract

The utility model discloses a novel aircraft maintenance equipment oil cylinder, which relates to the technical field of hydraulic oil cylinders and comprises a cylinder body, a primary piston rod is slidably sleeved in the cylinder body, a secondary piston rod is slidably sleeved in the primary piston rod, and guide sleeves are arranged between the cylinder body and the primary piston rod and between the primary piston rod and the secondary piston rod. The multiple guide sleeves are each provided with an anti-falling assembly. The anti-falling assembly comprises a driving disc rotationally installed above the guide sleeve, a plurality of shifting rods are fixedly installed on the circumferential side of the driving disc along the circumference, a plurality of arc-shaped driving grooves are evenly formed in the top of the driving disc along the circumference, sliding grooves corresponding to the driving grooves are formed in the top of the guide sleeve, and the sliding grooves are formed in the radial direction of the guide sleeve. According to the novel oil cylinder of the aircraft maintenance equipment, the piston rod is clamped through the multiple clamping plates, so that the piston rod can be clamped under the condition that the surface of the piston rod is kept unchanged, external dust is prevented from entering the oil cylinder, and the service life of the oil cylinder is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil cylinders, in particular to a novel oil cylinder for aircraft maintenance equipment. Background Art

[0002] The oil cylinder is a hydraulic cylinder. The hydraulic cylinder is a linear motion actuator whose output force is proportional to the effective area of ​​the piston and the pressure difference on both sides. Its function is to convert hydraulic energy into mechanical energy.

[0003] In the Chinese utility model patent application number: CN201821592951.2, a nut locking hydraulic cylinder is disclosed, the structure includes a base, a connecting bolt is arranged on the base, a cylinder housing is arranged on the connecting bolt, a fastening nut is arranged on the connecting bolt above the cylinder housing, a liquid inlet pipe is arranged at the front end of the cylinder housing, a fixing seat is arranged on the outer surface of the cylinder housing, and a connecting earring is arranged on the fixing seat. The nut locking hydraulic cylinder is provided with a thread on the piston rod and a nut is movably sleeved on the piston. When the piston rod is extended, the nut can be screwed downward until it reaches the lowest end by using the threaded connection between the nut and the piston rod, so as to lock the piston rod and prevent it from falling; however, the thread on the piston rod is easy to damage the dust ring on the guide sleeve, and dust and other particulate matter are easy to accumulate in the thread. When the piston rod is retracted, the particulate matter is easy to enter the cylinder. After the particulate matter enters the cylinder, it will cause wear on the piston rod, thereby reducing the service life of the entire cylinder.

[0004] Therefore, it is necessary to propose a new type of aircraft maintenance equipment cylinder to solve the above problems. Utility Model Content

[0005] Technical problem to be solved: The purpose of the utility model is to provide a new type of aircraft maintenance equipment cylinder to solve the problem of the existing nut locked hydraulic cylinder proposed in the above background technology, in which the threads on the piston rod are prone to damage the dust ring on the guide sleeve, and dust and other particulate matter are prone to accumulate in the threads. When the piston rod is retracted, the particulate matter is easy to enter the interior of the cylinder. After entering the interior of the cylinder, the particulate matter will cause wear on the piston rod, thereby reducing the service life of the entire cylinder.

[0006] Technical solution: To achieve the above purpose, the utility model is implemented through the following technical solutions: a new type of aircraft maintenance equipment oil cylinder, including a cylinder body, a first-level piston rod is slidably sleeved in the cylinder body, a second-level piston rod is slidably sleeved in the first-level piston rod, a guide sleeve is provided between the cylinder body and the first-level piston rod, and between the first-level piston rod and the second-level piston rod, and an anti-drop component is provided on multiple guide sleeves; the anti-drop component includes a driving plate rotatably mounted above the guide sleeve, a plurality of levers are fixedly mounted along the circumference of the circumference of the driving plate, a plurality of arc-shaped driving grooves are evenly opened on the top of the driving plate along the circumference, a slide groove corresponding to the driving groove is opened on the top of the guide sleeve, and the slide groove is arranged along the radial direction of the guide sleeve; a sliding block is slidably mounted in the slide groove, a connecting rod is fixedly mounted on the top of the sliding block, the top of the connecting rod passes through the corresponding driving groove and is fixedly mounted with a fixing block, and an arc-shaped clamping plate is fixedly mounted on one end of the fixing block facing the axis of the cylinder body.

[0007] Preferably, an annular groove is provided on the top of the guide sleeve, the slide groove is coaxially arranged with the guide sleeve, a connecting cylinder is rotatably installed in the annular groove, the top end of the connecting cylinder extends above the guide sleeve, and the drive disc is sleeved on the top of the connecting cylinder.

[0008] Preferably, an anti-slip pad is fixedly mounted on the inner side surface of the arc-shaped clamping plate.

[0009] Preferably, a bottom valve is provided in the oil inlet at the bottom of the first-stage piston rod, and a protrusion for opening the bottom valve is fixedly mounted on the inner bottom surface of the cylinder body.

[0010] Beneficial effects: Compared with the prior art, the utility model provides a new aircraft maintenance equipment oil cylinder, which has a unique structure and is easy to use. The driving disk is driven to rotate by a lever. When the driving disk rotates, the arc-shaped driving groove synchronously drives multiple clamping plates to move along the corresponding slide grooves toward the axial direction of the cylinder body, thereby clamping the primary piston rod and the secondary piston rod respectively, preventing the piston rods of each stage from being recovered under the gravity of the aircraft when the cylinder loses pressure, causing maintenance personnel to be injured; by using multiple arc-shaped clamping plates and arranging anti-slip pads on the inner side of the arc-shaped clamping plates, and by using multiple clamping plates to clamp the piston rod, the piston rod can be clamped while keeping the surface of the piston rod unchanged, thereby preventing external dust from entering the cylinder and increasing the service life of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a front view schematic diagram of the structure of the utility model;

[0012] Figure 2 It is a cross-sectional schematic diagram of the structure of the utility model;

[0013] Figure 3 It is a three-dimensional side view schematic diagram of the anti-fall assembly of the utility model;

[0014] Figure 4 For this utility model Figure 2 A magnified schematic diagram of the structure of area A in the middle.

[0015] In the figure: 1. cylinder body; 2. primary piston rod; 3. secondary piston rod; 4. bottom valve; 5. guide sleeve; 6. drive plate; 7. lever; 8. slider; 9. drive groove; 10. fixing block; 11. connecting tube; 12. clamping plate. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Embodiment 1: This embodiment 1 provides a new type of aircraft maintenance equipment cylinder, which is directly improved on the existing nut locking hydraulic cylinder and has a unique structure. Please refer to Figure 1-4 As shown, it includes a cylinder body 1, a primary piston rod 2 is slidably sleeved in the cylinder body 1, a secondary piston rod 3 is slidably sleeved in the primary piston rod 2, a bottom valve 4 is slidably sleeved in the secondary piston rod 3, a guide sleeve 5 is arranged between the cylinder body 1 and the primary piston rod 2, between the primary piston rod 2 and the secondary piston rod 3, and between the secondary piston rod 3 and the bottom valve 4, and an anti-drop component is arranged on multiple guide sleeves 5; the anti-drop component includes a driving disk 6 rotatably mounted above the guide sleeve 5, multiple levers 7 are fixedly mounted along the circumference of the circumference of the driving disk 6, a plurality of arc-shaped driving grooves 9 are evenly opened on the top of the driving disk 6 along the circumference, a slide groove corresponding to the driving groove 9 is opened on the top of the guide sleeve 5, and the slide groove is arranged along the radial direction of the guide sleeve 5.

[0018] There are many ways to install the drive disk 6, for example: an annular groove is opened on the top of the guide sleeve 5, the slide groove and the guide sleeve 5 are coaxially arranged, a connecting tube 11 is rotatably installed in the annular groove, the top of the connecting tube 11 extends to the top of the guide sleeve 5, and the drive disk 6 is sleeved on the top of the connecting tube 11; a slider 8 is slidably installed in the slide groove, a connecting rod is fixedly installed on the top of the slider 8, the top of the connecting rod passes through the corresponding driving groove 9 and is fixedly installed with a fixed block 10, and an arc-shaped clamping plate 12 is fixedly installed on the end of the fixed block 10 facing the axis of the cylinder body 1; an anti-slip pad is fixedly installed on the inner side of the arc-shaped clamping plate 12 to increase the friction between the clamping plate 12 and the corresponding piston rod.

[0019] When we use the oil cylinder to inspect the aircraft, we first extend the piston rods of each stage in the oil cylinder in turn to lift the aircraft, and then rotate the drive plate 6 through the lever 7. When the drive plate 6 rotates, it synchronously drives multiple clamping plates 12 along the corresponding slide grooves toward the axial direction of the cylinder through the arc-shaped driving groove 9, thereby clamping the primary piston rod 2 and the secondary piston rod 3 respectively, preventing the piston rods of each stage from being recovered under the gravity of the aircraft when the oil cylinder loses pressure, causing damage to the maintenance personnel.

[0020] Embodiment 2: Embodiment 2 is different from Embodiment 1 in that Figure 1 As shown, a bottom valve 4 is provided in the oil inlet at the bottom of the first-stage piston rod 2, and a protrusion for opening the bottom valve 4 is fixedly installed on the inner bottom surface of the cylinder body 1. By arranging the bottom valve 4 in the oil inlet on the first-stage piston rod 2, when the hydraulic oil in the cylinder applies thrust to the piston rod, the pressure pushes the first-stage piston rod 2 to extend, at which time the bottom valve 4 is in a closed state, and the second-stage piston rod 3 does not enter with oil. When the first-stage piston rod 2 is fully extended, the pressure in the cavity of the first-stage piston rod 2 increases and reaches the opening pressure of the bottom valve 4. The bottom valve 4 opens, and oil begins to enter the cavity of the second-stage piston rod 3, pushing the second-stage piston rod 3 to extend, thereby controlling the extension sequence of the first-stage piston rod 2 and the second-stage piston rod 3; when the cylinder contracts, the first-stage piston rod 2 returns to the starting position first, and when the first-stage piston rod 2 reaches the bottom, the bottom valve 4 contacts the protruding part of the cylinder bottom, the bottom valve 4 opens, the liquid in the cavity of the second-stage piston rod 3 flows back, and the second-stage piston rod 3 retracts by its own weight.

[0021] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel oil cylinder for aircraft maintenance equipment, comprising a cylinder body (1), characterized in that: A first-stage piston rod (2) is slidably sleeved in the cylinder body (1), and a second-stage piston rod (3) is slidably sleeved in the first-stage piston rod (2). A guide sleeve (5) is provided between the cylinder body (1) and the first-stage piston rod (2), and between the first-stage piston rod (2) and the second-stage piston rod (3). An anti-drop assembly is provided on each of the plurality of guide sleeves (5). The anti-drop assembly comprises a drive plate (6) rotatably mounted above the guide sleeve (5), a plurality of levers (7) are fixedly mounted along the circumference of the circumference of the drive plate (6), a plurality of arc-shaped drive grooves (9) are uniformly provided on the top of the drive plate (6) along the circumference, a slide groove corresponding to the drive groove (9) is provided on the top of the guide sleeve (5), and the slide groove is arranged along the radial direction of the guide sleeve (5); a slider (8) is slidably mounted in the slide groove, a connecting rod is fixedly mounted on the top of the slider (8), the top of the connecting rod passes through the corresponding drive groove (9) and is fixedly mounted with a fixing block (10), and an arc-shaped clamping plate (12) is fixedly mounted on one end of the fixing block (10) facing the axis of the cylinder body (1).

2. A novel aircraft maintenance equipment oil cylinder according to claim 1, characterized in that: The top of the guide sleeve (5) is provided with an annular groove, the slide groove and the guide sleeve (5) are coaxially arranged, a connecting tube (11) is rotatably mounted in the annular groove, the top end of the connecting tube (11) extends above the guide sleeve (5), and the driving disc (6) is sleeved on the top of the connecting tube (11).

3. The novel aircraft maintenance equipment oil cylinder according to claim 1 is characterized by: An anti-slip pad is fixedly mounted on the inner side surface of the arc-shaped clamping plate (12).

4. A novel aircraft maintenance equipment oil cylinder according to claim 1, characterized in that: A bottom valve (4) is provided in the oil inlet at the bottom of the first-stage piston rod (2), and a protrusion for opening the bottom valve (4) is fixedly mounted on the inner bottom surface of the cylinder body (1).

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