Rescue boat lifting crane telescopic arm structure

Abstract

The utility model relates to the technical field of hoisting cranes, in particular to a telescopic arm structure of a rescue boat hoisting crane. Which comprises a telescopic main body assembly and is characterized in that the telescopic main body assembly comprises a basic arm, a telescopic arm is arranged at one end of the basic arm, a pulley assembly is arranged at one end of the telescopic arm, a telescopic oil cylinder is arranged on one side of the basic arm, a first sliding block is arranged in the telescopic oil cylinder, and an oil cylinder pin shaft is arranged on the telescopic oil cylinder; through the nested design of the basic arm and the telescopic arm and the reasonable layout of components such as the pulley assembly and the telescopic oil cylinder, the overall structure is compact, the occupied space is reduced, and the telescopic arm is particularly suitable for being used on a rescue boat with the limited space; the telescopic oil cylinder is matched with the plate type one-way balance valve, so that stable stretching and precise control of the telescopic arm are ensured, and the operation efficiency is improved; and the positioning precision of the telescopic arm is further improved by introducing an adjusting nut and a laser calibration process.

Description

TECHNICAL FIELD

[0001] The utility model relates to a crane technology field especially a rescue boat crane telescopic arm structure. BACKGROUND

[0002] The traditional rescue boat crane telescopic arm structure has the following problems: the traditional design usually adopts multiple telescopic arms and a complex connection mode, resulting in a heavy structure, large space occupation, and difficulty in meeting the compactness requirements of the rescue boat. Maintenance difficulty: due to large friction and wear between components, the traditional device needs frequent maintenance, increasing the use cost and time cost; poor corrosion resistance: traditional materials are easily corroded in the marine high-salt fog environment, reducing the service life and reliability of the device; low control precision: the traditional design lacks precise adjustment and control system, resulting in insufficient positioning accuracy of the telescopic arm, affecting the operation efficiency.

[0003] A rail-mounted crane for ships (publication number: CN 213894995U) is disclosed, which includes a column, a bottom plate located on the outer surface of the bottom end of the column, and a connecting sleeve sleeved between the column and the bottom plate. The top end outer surface of the column is fixedly installed with a top rod, a connecting branch rod is welded between the column and the top rod, a hoisting device is arranged on one side of the bottom end of the top rod, a side plate is arranged on the outer surface of the hoisting device, and a hoisting rope is arranged at the bottom of the hoisting device. However, this crane structure connection mode is complex, resulting in a heavy structure, large space occupation, and difficulty in meeting the compactness requirements of the rescue boat; maintenance difficulty: due to large friction and wear between components, the traditional device needs frequent maintenance, increasing the use cost and time cost, so a rescue boat crane telescopic arm structure is needed. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving the problems in the prior art, such as complex crane structure connection mode, resulting in a heavy structure, large space occupation, and difficulty in meeting the compactness requirements of the rescue boat; maintenance difficulty: due to large friction and wear between components, the traditional device needs frequent maintenance, increasing the use cost and time cost, and proposes a rescue boat crane telescopic arm structure.

[0005] The utility model discloses a technical scheme that solves its technical problem is adopted: a kind of rescue boat crane telescopic arm structure of the utility model, including telescopic main body assembly, it is characterized by: the telescopic main body assembly includes basic arm, the basic arm one end is equipped with telescopic arm, the telescopic arm one end is equipped with pulley assembly, the basic arm one side is equipped with telescopic oil cylinder, the first sliding block is equipped in the telescopic oil cylinder, oil cylinder pin shaft is equipped on the telescopic oil cylinder, the basic arm below one side is equipped with connecting piece. Through the nesting design of basic arm and telescopic arm, the compactness and flexibility of structure are realized, adapt to different working condition demand;Pulley assembly adopts PA66 nylon material, reduces friction resistance, improves the stability of telescopic arm movement;The cooperation of telescopic oil cylinder and oil cylinder pin shaft ensures the power transmission and positioning accuracy of telescopic arm;Connecting piece enhances the stability and carrying capacity of overall structure.

[0006] Preferably, the telescopic oil cylinder one side is equipped with plate type one-way balance valve. Plate type one-way balance valve effectively controls the movement speed and load balance of oil cylinder, prevents impact when load of oil cylinder suddenly changes.

[0007] Preferably, the telescopic arm and sliding block assembly middle are equipped with adjusting nut. Adjusting nut realizes accurate fine adjustment of telescopic arm, ensures the accuracy of telescopic stroke;Laser calibration process ensures the cooperation accuracy of threaded pair, reduces friction and wear in movement.

[0008] Preferably, the connecting piece inside is equipped with second sliding block, the first sliding block one side is equipped with third sliding block, the first sliding block, second sliding block and third sliding block material are all special nylon. Special nylon sliding block has excellent wear resistance and low friction coefficient, prolongs service life;The combination design of multiple sliding blocks improves the stability and guiding accuracy of telescopic arm movement.

[0009] Preferably, the first sliding block inner wall is equipped with standby lip seal, outer wall is equipped with main seal ring, the standby lip seal material is polyurethane, the main seal ring material is fluorine rubber, the distance between main seal ring and standby lip seal is 5mm and parallel arrangement. Redundant design of main seal ring and standby lip seal ensures the anti-leakage performance under extreme working conditions;The combination of polyurethane and fluorine rubber materials takes into account wear resistance and corrosion resistance, adapts to marine environment.

[0010] Preferably, the material of basic arm and telescopic arm is Q690D high-strength steel, yield strength ≥690MPa, impact toughness ≥34J at-40℃, after sand blasting (Sa2.5 level) surface is coated with epoxy zinc-rich primer (80μm)+polyurethane finish (60μm). The high strength and low temperature toughness of Q690D steel material ensure the carrying capacity and impact resistance of structure under extreme conditions;Sand blasting and coating treatment significantly improve the corrosion resistance of structure, prolong service life.

[0011] The utility model discloses the beneficial effect lies in:

[0012] The application is compact in overall structure through the nesting design of basic arm and telescopic arm and the reasonable layout of pulley assembly, telescopic oil cylinder and other components, reduces the occupied space, and is especially suitable for use on a rescue boat with limited space; the cooperation of telescopic oil cylinder and plate type one-way balance valve ensures the stable extension and contraction and accurate control of telescopic arm, improves operation efficiency; the introduction of adjusting nut and laser calibration process further improves the positioning accuracy of telescopic arm and reduces operation error; the slider assembly and pulley assembly of special nylon (PA66) material have low friction coefficient and high wear resistance, significantly reduce the friction and wear between components, and prolong the service life of the device; Q690D high-strength steel material and surface coating treatment (epoxy zinc-rich primer + polyurethane finish) improve the corrosion resistance of the device in the marine high-salt fog environment; the design of redundant sealing system (main sealing ring and backup lip seal) further enhances the anti-leakage performance of the device under extreme working conditions; the high yield strength (greater than or equal to 690MPa) and low temperature impact toughness (-40℃ greater than or equal to 34J) of Q690D steel material ensure the stability and reliability of the device under heavy load and low temperature environment; the design of stepped positioning pin and nitriding treatment improves the shear resistance and wear resistance of the key connecting piece. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description are only some embodiments of the present utility model, and those skilled in the art can obtain other drawings according to these drawings without creating labor intensity.

[0014] Figure 1 It is a top view structural schematic diagram of the present utility model.

[0015] Figure 2 It is a front view structural schematic diagram of the present utility model.

[0016] Figure 3 It is Figure 2 The sectional view of A-A.

[0017] Figure 4 It is Figure 2 The sectional view of D-D.

[0018] In the figure: 1, plate type one-way balance valve; 2, basic arm; 3, telescopic arm; 4, telescopic oil cylinder; 5, second slider; 6, first slider; 7, adjusting nut; 8, third slider; 9, oil cylinder pin; 10, pulley assembly; 11, connecting piece; 12, main sealing ring; 13, backup lip seal. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0020] Embodiment

[0021] Please refer to Figures 1-4 As shown in FIG. 1, a rescue boat crane telescopic arm structure, including telescopic main assembly, its characterized in that: the telescopic main assembly includes basic arm 2, the basic arm 2 one end is equipped with telescopic arm 3, the telescopic arm 3 one end is equipped with pulley assembly 10, the basic arm 2 one side is equipped with telescopic oil cylinder 4, the telescopic oil cylinder 4 inside is equipped with first sliding block 6, the telescopic oil cylinder 4 is equipped with oil cylinder pin shaft 9, the basic arm 2 below one side is equipped with connecting piece 11. Through the nesting design of basic arm 2 and telescopic arm 3, the compactness and flexibility of structure are realized, and different working condition requirements are adapted;Pulley assembly 10 adopts PA66 nylon material, reduces frictional resistance, improves the stability of telescopic arm 3 movement;The cooperation of telescopic oil cylinder 4 and oil cylinder pin shaft 9 ensures the power transmission and positioning accuracy of telescopic arm 3;Connecting piece 11 enhances the stability and carrying capacity of the overall structure.

[0022] In the embodiment, the telescopic oil cylinder 4 one side is equipped with plate type one-way balance valve 1. Plate type one-way balance valve 1 effectively controls the movement speed and load balance of oil cylinder, prevents the impact of oil cylinder when load mutation.

[0023] In the embodiment, the telescopic arm 3 and sliding block assembly are equipped with adjusting nut 7. Adjusting nut 7 realizes the accurate fine adjustment of telescopic arm 3, ensures the accuracy of telescopic stroke;Laser calibration process ensures the matching accuracy of threaded pair, reduces friction and wear in movement.

[0024] In the embodiment, the connecting piece 11 inside is equipped with second sliding block 5, the first sliding block 6 one side is equipped with third sliding block 8, the first sliding block 6, second sliding block 5 and third sliding block 8 material are all special nylon. Special nylon sliding block has excellent wear resistance and low friction coefficient, prolongs the service life;The combination design of multiple sliding blocks improves the stability and guiding accuracy of telescopic arm 3 movement.

[0025] In this embodiment, the first slider 6 inner wall is provided with a standby lip seal 13, and the outer wall is provided with a main sealing ring 12. The standby lip seal 13 is made of polyurethane, and the main sealing ring 12 is made of fluororubber. The main sealing ring 12 and the standby lip seal 13 are arranged in parallel with a spacing of 5 mm. The redundant design of the main sealing ring 12 and the standby lip seal 13 ensures the anti-leakage performance under extreme working conditions. The combination of polyurethane and fluororubber materials takes into account the wear resistance and corrosion resistance, and is suitable for marine environment.

[0026] In this embodiment, the basic arm 2 and the telescopic arm 3 are made of Q690D high-strength steel with a yield strength of ≥690 MPa and an impact toughness of ≥34 J at -40℃. The surface is sandblasted (Sa2.5 level) and then coated with epoxy zinc-rich primer (80 μm) + polyurethane topcoat (60 μm). The high strength and low temperature toughness of Q690D steel ensure the load bearing capacity and impact resistance of the structure under extreme conditions.

[0027] The implementation principle of this embodiment is as follows: when the telescopic arm 3 needs to work, the hydraulic system is started, the hydraulic oil enters the telescopic cylinder 4, and the first slider 6 inside the cylinder is pushed to move; the first slider 6 is connected to the basic arm 2 through the cylinder pin shaft 9, and drives the telescopic arm 3 to extend outward or retract inward along the guide groove of the basic arm 2; during the telescoping process, the plate-type one-way balance valve 1 controls the movement speed and load balance of the cylinder, preventing the telescopic arm 3 from generating impact when the load suddenly changes, and ensuring smooth movement; when the telescopic arm 3 moves, the pulley assembly 10 forms a rolling friction pair with the guide groove of the basic arm 2 through the second slider 5 and the third slider 8, reducing the friction resistance and making the telescopic arm 3 move more smoothly;

[0028] If fine adjustment of the position of the telescopic arm 3 is needed, the axial gap between the telescopic arm 3 and the pulley assembly 10 is adjusted by rotating the adjusting nut 7, ensuring the accuracy of the telescoping stroke; when the telescopic arm 3 works in a high-salt marine environment, the standby lip seal 13 (made of polyurethane) on the inner wall of the first slider 6 and the main sealing ring 12 (made of fluororubber) on the outer wall work together to prevent seawater and impurities from entering the sliding gap; the main sealing ring 12 and the standby lip seal 13 are arranged in parallel with a spacing of 5 mm, forming a redundant sealing system to ensure the anti-leakage performance under extreme conditions;

[0029] When the device works in heavy load or low temperature environment, the Q690D high-strength steel material of the basic arm 2 and the telescopic arm 3 provides high yield strength (≥690 MPa) and low temperature impact toughness (-40℃≥34 J), ensuring the stability and reliability of the structure. After sandblasting (Sa2.5 level) treatment, the surface is coated with epoxy zinc-rich primer (80 μm) + polyurethane topcoat (60 μm), providing double corrosion protection and prolonging the service life of the device.

[0030] When the positioning of the telescopic boom 3 is completed, the hydraulic system stops working, and the telescopic boom 3 remains in a stable state, ready for a lifting operation. During the whole process, the components are precisely matched and linked to realize efficient and stable mechanical operation, and ensure reliable operation of the device under complex working conditions.

[0031] In the description of the present specification, the description referring to the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] The basic principles, main features and advantages of the present application have been shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only illustrative of the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A telescopic boom structure for a rescue boat crane, comprising a telescopic main assembly, characterized in that: The telescopic main body assembly includes a basic arm (2), a telescopic arm (3) at one end of the basic arm (2), a pulley assembly (10) at one end of the telescopic arm (3), a telescopic cylinder (4) on one side of the basic arm (2), a first slider (6) inside the telescopic cylinder (4), a cylinder pin (9) on the telescopic cylinder (4), and a connector (11) on one side below the basic arm (2).

2. The telescopic boom structure of a rescue boat crane according to claim 1, characterized in that: The telescopic cylinder (4) is equipped with a plate-type one-way balance valve (1) on one side.

3. The telescopic boom structure of a rescue boat crane according to claim 1, characterized in that: An adjusting nut (7) is provided between the telescopic arm (3) and the slider assembly.

4. The telescopic boom structure of a rescue boat crane according to claim 1, characterized in that: The connector (11) has a second slider (5) inside, and a third slider (8) is provided on one side of the first slider (6). The first slider (6), the second slider (5) and the third slider (8) are all made of special nylon.

5. The telescopic boom structure of a rescue boat crane according to claim 1, characterized in that: The inner wall of the first slider (6) is provided with a spare lip seal (13), and the outer wall is provided with a main sealing ring (12). The spare lip seal (13) is made of polyurethane, and the main sealing ring (12) is made of fluororubber. The main sealing ring (12) and the spare lip seal (13) are spaced 5mm apart and arranged in parallel.

6. The telescopic boom structure of a rescue boat crane according to claim 1, characterized in that: The basic arm (2) and telescopic arm (3) are made of Q690D high-strength steel with a yield strength ≥690MPa and an impact toughness ≥34J at -40℃. The surface is sandblasted (Sa2.5 grade) and then coated with epoxy zinc-rich primer (80μm) + polyurethane topcoat (60μm).

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